47results about How to "Labor-saving construction" patented technology

The invention discloses a method for planting vegetation on the karst area slope, comprising: laying and fixing a wave shape plant-growing net with meshes on the slope surface, wherein the wave shape plant-growing net can be formed by connecting a surface layer net and a wave shape net and also can be formed by connecting the surface layer net, the wave shape net and the bottom layer net; spraying the artificial soil for the shrub slope protection in the karst area on the wave shape plant-growing net by a mechanical or an artificial operation method, and spraying the plant growth substrate mixed with the plant seeds on the top of the artificial soil by a sprayer. The invention lays the wave shape plant-growing net with the meshes on the shrub slope protection in the karst area, therefore, the sprayed artificial soil and seeds during laying the planting substrate can absorb in the wave shape plant-growing net with the meshes. The invention provides an adhesion platform for the artificial soil and seeds to ensure the root system expansion during plant growth, promotes the construction speed and saves the construction cost.

The invention belongs to the technical field of construction material, and particularly relates to a mortar additive, wherein the mortar additive comprises the following components in parts by weight: 1-12 parts of cellulose ether, 20-80 parts of polymer latex powder, 20-70 parts of thixotropic agent and 0.1-0.7 part of air entraining agent. The production process of the mortar additive solves the problems that the mixed mortar has low quality; the mixed mortar has poor workability, is dry and difficult to scrape; the bonding strength is low, the phenomena of hollowing and dropping are easy to appear; the shrinkage is big, the surface is easy to crack and the like. The mortar mixed with the mortar additive provided by the invention has the advantage of high combination property, such as construction property, water retention, compressive strength, bonding strength, cracking resistance and the like.

The invention discloses a water-based heavy-duty single-component on-rust primer, and a preparation method and application thereof. The water-based heavy-duty single-component on-rust primer is composed of deionized water, a main conversion agent, an auxiliary conversion agent, a penetrant, a film forming assistant, an antifreezing agent, a preservative, a thickener, a filler, a defoaming agent, a dispersing agent, a pH regulator, a film forming material and a substrate wetting agent. The temperature of the used substrate can not be too high, the humidity can not be greater than 85%, the one-time spray coating can not be too thick, and the position for electric welding is reserved. The product is stored at 5-40 DEG C in a ventilating cool dry place, and the construction temperature is preferably 10-40 DEG C. The primer can be applied by brush coating, roller coating, air spraying or airless spraying, the particular mode can be selected according to the on-site construction environment and climate conditions, and brush coating and airless spraying are suggested if conditions permit.

The invention discloses a sprayed quick-setting liquid rubber waterproof coating. The coating comprises a component A, a component B and a component C, the component A is a waterproof material host solution, the component B is a catalyst and de-emulsifier solution, and the component C is a reinforcing fiber solution. A preparation method of the waterproof coating comprises the following steps: respectively preparing the component A, the component B and the component C, jetting the above three components through independent feeding and discharging systems to realize contact, mixing and reaction of the atomized component A, component B and component C, quickly molding after falling to the ground, precipitating to obtain reaction water, and bonding the above obtained A and B mixture to the component C reinforcing fiber through a special roll in order to form an overall seamless fiber reinforced membrane. The coating has the advantages of quick film forming 4s after spraying, excellent adhesiveness, high elastic self-healing, high elongation of above 600%, strong abnormal adhesion, strength reaching above 0.7MPa, strong corrosion resistance and high and low temperature resistance.

The invention provides a preparation method of a viscosity-reducing polycarboxylate superplasticizer and an application thereof. The viscosity-reducing polycarboxylate superplasticizer can remarkably reduce the viscosity of concrete on the premise of guaranteeing high water reduction and high slump loss resistance; and the preparation method has the advantages of simple technology, low cost, little pollution and the like. In the preparation method, a specific unsaturated acid monomer, a specific unsaturated polyether macromonomer and N-(4-vinyl benzyl)-N, N-dialkylamine in a molar ratio of (2.5-6.5):1:(0.05-0.2) are subjected to free radical copolymerization reaction to obtain the viscosity-reducing polycarboxylate superplasticizer.

The invention discloses an environmentally friendly efficient silt remover and a construction method thereof. The environmentally friendly efficient silt remover comprises a silt transportation device, wherein the silt transportation device comprises a traveling trolley body; the traveling trolley body is provided with a box; a silt shoveling mechanism is arranged at the front end of the box; two spiral conveyors are arranged between the silt shoveling mechanism and the traveling trolley body; silt is fed into a sorting mechanism in the box so as to sort the silt and sundries, qualified silt which is sorted by the sorting mechanism is discharged via a collecting tube and a discharging tube, and the large sundries are discharged by an outlet of a sorting barrel. In a silt removing process, the environmentally friendly efficient silt remover has the characteristics of convenience in operation, convenient in cleaning, efficient construction and labor saving. Meanwhile, silt is sorted directly by the sorting mechanism, secondary environment pollution is avoided, and the environmentally friendly efficient silt remover is environmentally friendly.

The invention relates to a wall-like brick high-molecular hard wall decorative material, comprising a base material, a printing mask and a polyester coating layer, wherein the base material and the printing mask are laminated together by hot pressing, and the polyester coating layer is coated as a net on the surface of the printing mask. A preparation method of the wall-like brick high-molecular hard wall decorative material comprises the following steps: 1, preparing the base material; 2, preparing the printing mask; 3, printing a mask; 4, performing hot-pressing lamination; 5, performing net coating of polyester; 6, curing; and 7, performing mould pressing cutting. The wall-like brick high-molecular hard wall decorative material provided by the invention has the advantages of avoiding mildew, having fire resistance, and being high in strength, hardness, degree of finish, brightness, and simulation view; and the preparation method has the advantages of being low in production cost, high in quality of products, and high in assembly line output.

The invention belongs to a rib-line-shaped prestressed concrete pipe pile. The rib-line-shaped prestressed concrete pipe pile is composed of a pile body, wherein protruding rib lines or protruding movable outer expanding wings are arranged on the peripheral wall of the pile body. The rib lines are rectangular strip-shaped bodies which are spirally distributed at intervals. The rib lines are equal-height rib bodies which are arranged at intervals. The rib lines are crescent rib bodies which are arranged at intervals, and the crescent rib bodies are obliquely arranged and are arranged independent of one another. Prestressed reinforcement formworks are arranged in the pile body at intervals, and the pile body is round or square. The friction coefficient of the concrete pipe pile and a foundation soil layer can be substantially increased, and the pipe pile has the advantages that the pipe pile is high in bearing and supporting force and free of sedimentation, labor and effort are saved in the construction process, and the service life of a building is long.

The invention relates to a water-based heavy-duty single-component primer, which is prepared from the following components in parts by mass: 18 to 33, preferably 20 to 30, parts of de-ionized water, 1.5 to 10, preferably 2 to 8, parts of a coalescing agent, 6 to 12, preferably 8 to 10, parts of an anti-rust pigment, 3.5 to 17, preferably 5 to 15, parts of filler, 0.3 to 1.2, preferably 0.5 to 1.0, part of a dispersant, 0.08 to 0.4, preferably 0.1 to 0.3, part of a pH regulator, 38 to 75, preferably 40 to 70, parts of a film former, 7 to 11, preferably 8 to 10, parts of a complexing agent and 0.1 to 0.3, preferably 0.2, part of a penetrant. The invention also provides a preparation method and application of the water-based heavy-duty single-component primer.

The invention discloses a derusting antirust colored heavy-duty single-component primer and a production technique thereof. The primer comprises the following components in parts by weight: 5-20 parts of deionized water, 20-25 parts of derusting rust inhibitor, 2-8 parts of film formation assistant, 2-4 parts of antifreezing agent, 0.1-0.2 part of thickener, 3-10 parts of color paste, 0.3-1 part of defoaming agent, 40-70 parts of film forming matter, 3-5 parts of adhesion modifier and 0.3-0.6 part of substrate wetting agent. The production technique comprises the following steps: mixing the components, and stirring and dispersing in a stainless steel reaction kettle; and after all the indexes are qualified through detection and the stirring is finished, filtering through a 100-mesh filter screen, and packaging. The 1318 or KX-123 product is used as the derusting rust inhibitor, the H602 emulsion is used as the film former, and the film formation assistant, substrate wetting agent, imported color paste and other pollution-free assistants are added to prepare the water-based environment-friendly derusting antirust colored single-component primer. The primer has the advantages of accessible raw materials, derusting labor saving, high antirust property, high safety, environment friendliness and high corrosion resistance.

The invention discloses a frame spinning plug-in type integrated inner partition wall plate. The plate is composed of a steel frame, an inner insulation layer, a base layer plate, a surface layer plate, a decorative plate and a frame decoration strip. The steel frame comprises an upper crosspiece, a lower crosspiece, a vertical brace, a horizontal brace tube, a spinning screw pin, a fixing pin, a guide sleeve and a movable pin. The upper crosspiece and the lower crosspiece are vertically connected with the vertical brace. The upper crosspiece is provided with a flanged hole. The vertical brace is provided with a through hole. The horizontal brace tube is fixedly connected with the vertical brace after penetrating through the through hole of the vertical brace. The guide sleeve is vertically connected with the lower crosspiece after penetrating through a through hole of the lower crosspiece. The fixing pin and the through hole of the vertical brace are fixed vertically. The spinning screw pin comprises a screw rod. The screw rod is sleeved with a fixed nut and a movable nut. The fixed nut and the middle of the screw rod are fixedly connected. The frame spinning plug-in type integrated inner partition wall plate has the advantages of being light, thin, high in expressive force, stain-resistant and self-cleaning, A-level fireproofing, anti-knock and anti-cracking, anti-freeze-thaw, acid and alkali resistant, recyclable in using, and low in construction cost.

The invention discloses a drill bit for constructing a cast-in-situ bored pile and a hole forming method. The drill bit is provided with a detachable mud scrapping assembly, the mud scrapping assembly comprises mud scrapping plates (8) and installing plates (9), the installing plates (9) are welded to the inner circumferential face of a check ring (3), a steel brush (14) is arranged at the outer side of each mud scrapping part (8.2), the mud scrapping plates (8) are hooked and hung on the check ring (3) through clamping grooves (10), and an installing part (8.1) of each mud scrapping plate (8) is located between two corresponding installing plates (9) in the same set and fixed to the corresponding installing plates (9) at the two sides through threaded connection. The hole forming method is characterized in that in the drilling process, the mud scrapping plates (8) are installed on the check ring (3) to drill a big hole matched with a pile casing in size, and then the mud scrapping plates (8) are dismantled to drill a small hole, wherein the size of the small hole is matched with the design size of the cast-in-situ bored pile. By means of the drill bit and the hole forming method, sandy soil between the pile casing and the pile hole can be effectively drilled away without substantially increasing time and economic cost.

The invention discloses a drill bit for constructing bored piles and a construction method using the drill bit. The drill bit is provided with a mud scraping assembly and a detachable rib protecting block. The mud scraping assembly comprises a mud scraping plate (8) and installing plates (9), and the installing plates (9) are welded to the circumferential face of the inner circle of a block ring (3). A steel brush (17) is arranged on the outer side of the mud scraping plate (8). The mud scraping plate (8) is hung on the block ring (3) through a first clamping groove (10). An installing part (8.1) of the mud scraping plate (8) is located between the two installing plates (9) of the same set, and the installing part (8.1) of the mud scraping plate (8) and the installing plates (9) on the two sides are fixed in a threaded connection mode. The method is characterized in that in the drilling process, the mud scraping plate (8) is firstly installed on the block ring (3) so that a large hole with the size matched with that of a pile casing can be drilled, then the mud scraping plate (8) is taken down, and the rib protective block is installed so that a small hole with the size matched with the designed size of the bored piles can be drilled. By means of the drill bit and the construction method, sand soil between the pile casing and the pile holes can be effectively removed in a drilling mode.

The invention discloses a production process for a prefabricated steel bar component, and raw materials comprise cement, lime, sand and steel bars. The advantages of the production process are: the whole construction step is simple, and the production process has the advantages of environmental protection, no pollution, and quick and labor-saving construction; after artificially controlling the curing time, the performance of the prefabricated steel bar component plates is more easily controlled; the prefabricated steel bar component plates have the advantages of high surface smoothness, highhardness, high impact strength, etc.; the prefabricated steel bar component plates are closely combined with each other to reduce the gap between each other, and the heat insulation effect is improved; and honeycomb, exposed ribs, pitted surfaces and holes in the prefabricated steel bar component plates are avoided in the whole construction process.

The invention relates to a type of water-based antirust and antifouling paint used on a wall surface. The paint contains the following components in parts by weight: 20-60 parts of film forming substance, 1-10 parts of film-forming additive, 0.5-2 parts of copolymer of unsaturated monomer which contains fluoro aliphatic groups and unsaturated silane monomer, 0-5 parts of cosolvent, 0.1-1 part of corrosion inhibitor and appropriate amount of water. The invention further designs a preparation method of the paint. The water-based paint used for preventing rust and dirt on the wall surface is environment-friendly and economic; the water-based paint and common wall surface emulsion paints have the same the construction ways. The paint disclosed by the invention can prevent rust on the wall surface, has the capability of resisting stains and can reach better beautifying and decoration effects. The paint is an excellent paint which is used on the wall surface and is antirust, antifouling, environment-friendly and economic.

A vertical-type well cover cyclone milling machine is composed of a cyclone milling outer frame, a cyclone milling inner frame, a rotating motor, a milling cutter head part, a lifting system, travelling systems, a control system, a handrail and a generator set. The cyclone milling outer frame and the cyclone milling inner frame are each of a rectangular frame structure, and the travelling systemsare mounted at the bottom of the cyclone milling outer frame. A platform of the generator set and the handrail are mounted on the right side of the cyclone milling outer frame. The lifting system is composed of a lifting motor, a left sliding way and a right sliding way. The milling cutter head part is connected with the rotating motor and comprises a cutting support, a connecting part and millingcutters. The control system adopts a PLC. Milling and drilling of a circular well cover hole are achieved, the trouble of multiple-time crossed destructive cutting of a common joint cutter is eliminated, the efficiency of the vertical-type well cover cyclone milling machine is higher than that of the common joint cutter, the time, labor and materials are saved during construction, and the constructed road surface is attractive, firm, durable and high in bearing capacity, and leakage and collapse are avoided.

The invention relates to a large motor and particularly relates to an adjustment tool for the large motor. The adjustment tool for a large-motor rotor and stator includes a main ruler and an auxiliary rule. The main rule is hollow inside and the upper edge of the outer surface of the main ruler is provided with a scale and the side face of the main ruler is provided with an opening groove. Two walls at the inner side of the main ruler are both provided with oblique planes which oblique from inside to outside and from top to bottom. The auxiliary ruler is inserted into the main ruler and the side of the head end of the auxiliary ruler is provided with oblique planes corresponding to the oblique planes in the main ruler. A slide shaft is arranged at the starting point positions of the oblique planes of the auxiliary ruler. The tail end of the auxiliary ruler is provided with a slide block which is inserted into the opening groove in the surface of the main ruler. The adjustment tool is capable of reducing effectively construction personnel, improving device installation efficiency and improving effectively installation precision.

The invention discloses a constructional engineering construction formwork device, and relates to the field of building structures. The constructional engineering construction formwork device comprises a heavy formwork and a light formwork which are provided with lock catches; the heavy formwork is provided with a threaded pipe; the threaded pipe is internally provided with a threaded rod; the threaded rod is provided with a support plate; the heavy formwork is provided with two support frames; and the support frames are provided with rollers. The constructional engineering construction formwork device is very convenient to assemble and disassemble, labor is saved during construction, the use stability is good, and the building construction efficiency is improved.

The invention discloses a spraying quick-setting liquid rubber waterproof coating, which includes three components, A, B and C. The A component is a main agent solution of a waterproof material, and the B component is a catalyst and a demulsifier solution. The C component mentioned is a reinforcing fiber solution. The manufacturing method of the waterproof coating includes: the preparation of the A component, the B component and the C component respectively, and then the three components are sprayed out through independent feeding and discharging systems, and the atomized two components A and B are sprayed out. The C components meet, mix and react in the air. After landing, they are rapidly formed, and the reaction water is precipitated. After special rolling, the AB mixture and the C component reinforcing fibers are bonded together to form an integral seamless fiber-reinforced membrane. The obvious advantages of the invention are: fast film formation, spraying for 4 seconds; excellent adhesion; high elastic self-healing; high elongation, elongation above 600%; ; And strong corrosion resistance and high and low temperature resistance.

The invention discloses a construction method of a protection layer of a foundation pit oblique plane waterproof layer. The method is adopted on the foundation pit waterproof oblique plane with the angle being larger than or equal to 45 degrees, and conventional fine aggregate concrete is replaced by galvanized iron sheets to serve as the protection layer of the waterproof layer. The method specifically comprises the first step of preparing materials for the protection layer, wherein a metal skin with good extensibility is customized according to the area of the constructed foundation pit waterproof oblique plane to serve as the protection layer; the second step of pasting the protection layer on the waterproof layer oblique plane, wherein one face of the protection layer is coated with a binding agent and the oblique plane waterproof layer is externally paved with the protection layer; the third step of clipping and edge repairing, wherein clipping is carried out according to the actual situation on the spot, and a little galvanized sheet iron is used for repairing the edges at the junction of a thin part. The metal skin with good extensibility serves as the protection layer and is galvanized sheets with the thickness ranging from 0.35 mm to 0.5 mm, the binding agent coated on the back face of the protection layer is 502 glue, and the metal skin serving as the protection layer can be formed by splicing the galvanized sheets and binding the galvanized sheets through a seal adhesive belt with the width ranging from 50 mm to 70 mm. The construction method is convenient to apply, time and labor are saved, and the protection effect for the waterproof layer is good.

The invention relates to a cavern-shaped molding board for a salt treatment house roof, which comprises a wire-mesh framework, a projection, polyurethane expanded polystyrene or mortar, bond and salt powder, wherein the wire-mesh framework is provided with the projection, the projection is provided with a layer of polyurethane expanded polystyrene or mortar, and a layer of bond and salt powder is sequentially arranged above the polyurethane expanded polystyrene or mortar. The wire-mesh framework is of a square shape, a rectangular shape, a circular shape, an ellipsoid shape or a triangular shape. The projection adopts the wire-mesh material or the molded glass fiber reinforced fabric. The projection is formed by a plurality of centrum with different sizes or raised bodies with different sizes. The materials adopted by the molding board are toxic free and harmless. The wire-mesh framework, the polyurethane expanded polystyrene and the sand are of light materials. The molding board is very safe to install on the roof, is convenient to construct, and saves time and labor. A plurality of molding boards can be joined to form the roof so as to authentically reflect the cavern effect, so people can have a rest in silence just like entering the natural cavern, and can breath freely so as to realize the best treatment effect.

The invention discloses a thin type floor heating system mounting structure, and relates to the technical field of floor heating system mounting structures. The thin type floor heating system mounting structure comprises a floor decoration layer which is manufactured through a thin ceramic board, a heat dissipating plate which is connected through a special adhering agent for heating, and a heat preserving layer. With the adoption of the thin type floor heating system mounting structure, more than 50% of thickness of the constructed surface can be saved, and the good effect of 'decreasing three and adding one' is achieved; decreasing three is namely decreasing the energy consumption of a floor heating system, reducing the loss of housing story, and reducing the overall construction period; and adding one is adding the temperature increasing temperature of the floor heating system.

The invention discloses a rubber hammer for power construction. The rubber hammer comprises a fixed ring, a rubber hammer body and a rod. A lifting structure is movably connected in the rod, and the bottom end of the lifting structure is movably connected with a mounting groove. The fixed ring is arranged at the top end of the mounting groove, and the rubber hammer body is connected in the fixed ring in a clamped manner. Shock absorption structures are arranged in the rubber hammer body and each comprise a cavity, connecting blocks, a first buffer spring and a second buffer spring. The shock absorption structures are arranged in the rubber hammer body, and during use, when the rubber hammer body is in contact with a contact object to apply force, the inner shock absorption structures can bear force to achieve buffering; and the cavities are arranged in the rubber hammer body, the first buffer springs and the second buffer springs are arranged in the cavities, the interiors of the cavities are supported and filled, when the rubber hammer body bears force, the inner buffer springs bear force to achieve internal digestion, the vibration feeling of the hands is reduced, and the rubberhammer is more comfortable to use and better in shock absorption and buffer effect.

The invention provides a convenient foundation pit supporting frame and a supporting method thereof. The convenient foundation pit supporting frame comprises a supporting frame body and an embedded part, wherein the supporting frame body is of an integral structure with the I-shaped cross section and comprises a left side plate, a web and a right side plate; the left side plate and the right sideplate are respectively and fixedly arranged at the two sides of the web; a plurality of side plate connecting parts are uniformly distributed on the inner walls of the left side plate and the right side plate; a plurality of web connecting parts are uniformly distributed on the web; the web connecting parts and the side plate connecting parts are identical in height; the embedded part is of a triangular prism structure with a right angled triangle cross section; and fixed parts connected to the web connecting parts and the side plate connecting parts are arranged on the three right angle surfaces of the embedded part. The convenient foundation pit supporting frame and the supporting method thereof have the beneficial effects that the convenient foundation pit supporting frame is simple instructure, can be prefabricated in advance, is convenient to produce and transport, causes the site construction to be time-saving and labor-saving, facilitates the construction of workers, meanwhilefacilitates the fallow-up disassembly work and greatly improves construction efficiency.

The invention provides a ground structure applied to a soft soil foundation and a construction method of the ground structure. The ground structure comprises a lower supporting rib, an intersection rib and a ground layer, wherein the lower supporting rib and the intersection rib are casted in the soft soil foundation, the ground layer is casted on the surface of the soft soil foundation, and the lower supporting rib, the intersection rib and the ground layer are of a plain concrete structure or reinforced concrete structure integrally casted and molded; and the construction method comprises the steps that the ground of the soft soil foundation is leveled, and a net-shaped groove is formed in the leveled ground; concrete is casted in the net-shaped groove and the ground; or reinforcing steel bars are arranged in the net-shaped groove and on the ground, and then, concrete is casted, so that the ground structure with the lower supporting rib, the intersection rib and the ground layer is formed; and the ground structure has the large bearing force, time and labor are saved in the construction process, the construction cost is low, and the civilized and environment-friendly construction requirement is met.

The invention discloses a drill bit for constructing a cast-in-situ bored pile and a hole forming method. The drill bit is provided with a detachable mud scrapping assembly, the mud scrapping assembly comprises mud scrapping plates (8) and installing plates (9), the installing plates (9) are welded to the inner circumferential face of a check ring (3), a steel brush (14) is arranged at the outer side of each mud scrapping part (8.2), the mud scrapping plates (8) are hooked and hung on the check ring (3) through clamping grooves (10), and an installing part (8.1) of each mud scrapping plate (8) is located between two corresponding installing plates (9) in the same set and fixed to the corresponding installing plates (9) at the two sides through threaded connection. The hole forming method is characterized in that in the drilling process, the mud scrapping plates (8) are installed on the check ring (3) to drill a big hole matched with a pile casing in size, and then the mud scrapping plates (8) are dismantled to drill a small hole, wherein the size of the small hole is matched with the design size of the cast-in-situ bored pile. By means of the drill bit and the hole forming method, sandy soil between the pile casing and the pile hole can be effectively drilled away without substantially increasing time and economic cost.

The invention discloses a novel stainless steel skirting construction method used in a color steel plate wall. The method comprises the first step of manufacturing stainless steel skirting lines; the second step of delivering the manufactured stainless steel skirting lines to a construction site, and connecting the stainless steel skirting lines with the color steel plate wall through rivets; the third step of filling concave joints of the color steel plate wall; the fourth step of sealing and beautifying the joint of the color steel plate wall and the ground and the concave joints of the color steel plate wall; the fifth step of conducting beautifying processing in the later period. According to the novel stainless steel skirting construction method used in the color steel plate wall, the stainless steel skirting lines can be better combined with the color steel plate wall compared with traditional skirting lines, and the combination is more decent and cleaner in visual effect compared with the traditional skirting lines. As metal skirting lines, the stainless steel skirting lines can be more harmoniously jointed with the color steel plate wall compared with the traditional skirting lines, and more time and labor through a method of rivet connection than through a traditional skirting line construction method.

The invention discloses a formwork supporting method and device for a large-section concrete column. A set of connecting rods and a set of corner hoops are connected into rectangular hoops through a set of pin pieces, and a set of formworks are hooped into a rectangular cylinder through the rectangular hoops to serve as a pouring cavity of the large-section concrete column. The device has the scalability, and the size change of the large-section column can be met; and mounting and dismounting are easy and fast, and the beneficial effects of saving labor and time are achieved. Compared with an existing opposite-pull screw reinforcing method, an opposite-pull screw does not need to be arranged, and holes reserved in the opposite-pull screw do not need to be repaired after pouring. The device can be used in a turnover manner, and cost is saved.

A special reamer for rock comprises a reaming head, a first-stage reamer body, a connector, a second-stage reamer body, a top plate, a connection lead screw, a nut and a drill stem; the first-stage reamer body is arranged at the top end of the reaming head, and a reaming head convex block is embedded into a first-stage reamer body bottom groove to achieve limiting of the first-stage reamer body and the reaming head; the connector and the second-stage reamer body are arranged at the top end of the first-stage reamer body; a connection bottom block is embedded into a first-stage reamer body topconnection groove, and a connection top block stretches into a second-stage reamer body cavity; a connector convex block is embedded into a second-stage reamer body bottom groove, and a second-stage reamer body connection block is embedded into a first-stage reamer body connection groove, so that limiting of the second-stage reamer body and the first-stage reamer body is achieved; the top plate isembedded into a second-stage reamer body connection groove; the bottom end of the connection lead screw stretches into the device; the top end of the connection lead screw is fixed to the top plate due to threaded connection of the nut; and the drill stem is fixed to the connector and the reaming head in a threaded manner. The special reamer for the rock can be subjected to structural adjustmentaccording to the reaming size, and is flexible to use and high in structural strength.

The invention discloses a drill bit for constructing bored piles and a construction method using the drill bit. The drill bit is provided with a mud scraping assembly and a detachable rib protecting block. The mud scraping assembly comprises a mud scraping plate (8) and installing plates (9), and the installing plates (9) are welded to the circumferential face of the inner circle of a block ring (3). A steel brush (17) is arranged on the outer side of the mud scraping plate (8). The mud scraping plate (8) is hung on the block ring (3) through a first clamping groove (10). An installing part (8.1) of the mud scraping plate (8) is located between the two installing plates (9) of the same set, and the installing part (8.1) of the mud scraping plate (8) and the installing plates (9) on the two sides are fixed in a threaded connection mode. The method is characterized in that in the drilling process, the mud scraping plate (8) is firstly installed on the block ring (3) so that a large hole with the size matched with that of a pile casing can be drilled, then the mud scraping plate (8) is taken down, and the rib protective block is installed so that a small hole with the size matched with the designed size of the bored piles can be drilled. By means of the drill bit and the construction method, sand soil between the pile casing and the pile holes can be effectively removed in a drilling mode.