66results about How to "Small working surface" patented technology

The invention discloses a synchronous grouting material used for a tunnel and a preparation method thereof. The grouting material is the grout which is prepared by taking sediment grout as a main raw material, wherein the sediment grout comprises 30 to 65 percent of clay and fine sand totally and the weight ratio of soil to sand in the sediment grout is 0.1-0.18:1; and adding 80 to 120 kg of cement, 300 to 450 kg of coal ash, 200 to 500 kg of water or mud water and 3 to 10 kg of sodium carboxymethyl cellulose into per cubic meter of the sediment grout, wherein the grout density is between 1.85 and 2.05 g/cm<3> and the grout consistency is between 10.5 and 12 cm. In the preparation method, sediment and the mud water generated in a construction process are adopted as grouting materials, so that the sediment and the mud water can be changed into treasure from waste; and therefore, the preparation method has the characteristics of great reduction of the dosage of high-energy consumption cement, capability of working inside and outside tunnels, and convenient construction.

The invention discloses a method for manufacturing roofing truss. The truss is constructed by truss nodes which are formed by assembling truss members by welding. The manufacturing steps are: decomposing an integral truss into the truss members in a computer, and manufacturing the truss members; manufacturing a bed-jig for assembling by welding; locating an upper chord, a lower chord and a taper transition section on the bed-jig, hoisting and locating brackets of sub-trusses and welding; hoisting and locating brackets of straight web members and welding; hoisting and locating brackets of slant web members, welding and measuring; hoisting and locating drawing plates, mounting stiffening plate, and welding; re-hoisting to the bed-jig for measuring and calibrating; marking out residual lines at the end parts and butting; and integrally assembly. The upper chord and lower chord in the invention adopts integral manufacturing, dispenses with intermediate inlaying web member, thus shortening distance between the upper chord and the lower chord, reducing assembly area and improving processing efficiency; the computer is adopted to collect coordinate data, thus ensuring preciseness of mounting and locating, reducing working hours, and increasing economic benefit.

The invention provides a vertical shaft construction device and a method, and belongs to the field of foundation engineering construction. The device comprises a ring beam, supports, a support system and floating prevention structures, wherein the ring beam is arranged in a soil body above a tunnel; the supports are applied to the side walls of a vertical shaft; the support system is a multilayer structure, and comprises a steel support structure and a middle separation plate structure arranged in the vertical direction; the support system is perpendicular to the length direction of the vertical shaft, and is fixedly connected with the supports at the two sides of the vertical shaft; and the floating prevention structures are positioned at the upper side and the left and right sides of the tunnel. The span of the vertical shaft is small, the device is provided with the multilayer support system, and the vertical shaft construction device is strong in structure, so that the pressure of soil bodies at the two sides of the tunnel can be preferably transferred, the interference on the soil bodies around the subway tunnel is little, and the swell quantity of the tunnel can be effectively controlled to satisfy the design requirement. In addition, the symmetric parallel operation can be adopted to synchronously construct and install the device on multiple working surfaces, so that the construction period is reduced.

The invention discloses a zanthoxylum picker comprising a picker body, a picker cover and a picker handle, wherein the picker cover is connected with the upper side of the picker body; and the picker handle is connected with the lower side of the picker body. The zanthoxylum picker is characterized in that the picker body is a hollow structure in the shape of an inverted trapezoid and is provided with a spanner hole at the lower part; an oriented plate is clamped between the picker body and the picker cover and is provided with a triangular fixed hook at the front end, a rectangle at the rear part and a rectangular opening in the middle; a cutter accelerator is installed on the oriented plate through a screw shaft, the front end of the cutter accelerator is connected with a cutter frame arranged in the rectangular opening of the oriented plate through a cutter frame coupler, and the rear end is connected with an elbow of a power driving rod; the power driving rod is installed in a front supporting frame and a rear supporting frame in the picker body, the lower side of the power driving rod is connected with a spanner passing through the spanner hole, and a tension spring is connected between the spanner and the front supporting frame and between the spanner and the rear supporting frame; and the front end of the cutter frame is provided with a blade. The picker has high picking speed and quality, low production cost and convenient popularization and application; in addition, three thorns are not easy to stab fingers.

The invention provides a steel corrugated shell and prestressed concrete composite beam and a construction method thereof. The steel corrugated shell and prestressed concrete composite beam comprisesa steel corrugated shell, a prestressed steel strand and a concrete layer, wherein the steel corrugated shell comprises upper flanges, lower flanges, a corrugated web and an end web; the two upper flanges are arranged in parallel at left and right and are connected with each other by means of at least one upper flange connecting piece; the two lower flanges are arranged in parallel at left and right and are connected with each other by means of at least one lower flange connecting piece; the upper flanges and the lower flanges are arranged up and down in parallel; the corrugated web is arranged between the upper flanges and the lower flanges; the end web is arranged at the end of the corrugated web and is erected between the upper flanges and the lower flanges; the prestressed steel strandis arranged in the steel corrugated shell and passes through the steel corrugated shell along the length direction of the steel corrugated shell; the steel corrugated shell is internally filled withconcrete so as to form the concrete layer. The steel corrugated shell and prestressed concrete composite beam provided by the invention is good in shearing resistance, shock resistance and fire resistance, and is economical.

The invention discloses a construction process of a super-large cofferdam based on marine environment, which is characterized in that the cofferdam uses a sand washing film bag and a trapezoidal section structure. The width of the top of the cofferdam is about 15 meters, graded slope setting is carried out according to the height, and the slope of a upstream face is 1:3-1:4, the slope of a downstream face is 1:4, a steel plate pile water stop curtain is arranged on the top of the cofferdam, and a steel plate pile water stop curtain is arranged on the slope foot of the downstream face. The sandwashing film bag and the steel plate pile are combined in the process, and the process has the advantages that: the construction speed is fast, and the construction period can be shortened; the stability and durability are good, washing and flood can be resistant; due to the addition of the steel plate pile water stop curtain, the steel plate pile water stop curtain has higher rigidity and betteranti-seepage performance, and can achieve a good water-blocking effect; meanwhile, the cofferdam is convenient and fast to disassemble; and the steel plate pile can be used in a turnover way, so thatthe construction cost is reduced. The construction process of the super-large cofferdam based on the marine environment can provide reference basis and experience guidance for similar projects such as a water tunnel, a wharf cofferdam, a river-crossing bridge and the like.

The invention provides a high-speed construction method of tunnel lining concrete. The method comprises the following steps: mounting umbrella arch reinforcement bars of the side wall first; removing ballast of tunnel soleplates; mounting reinforcement bars of the tunnel soleplates; pouring concrete of the tunnel soleplates; and pouring umbrella arch concrete of the side wall or pouring gross section concrete. The method has the advantages of improving the utilization ratio of the ballast road paved before excavating, reducing the working faces formed by repeatedly backfilling and removing the ballast road, overcoming the defects of repeatedly removing the ballast and paving a construction road, ensuring the simultaneous concrete construction of a plurality of working faces for the same tunnel lining, speeding up the construction of tunnel lining concrete and saving construction cost.

The present invention provides an angle fixing type needle holder for surgical operation, relating to medical instruments field, the needle holder comprises a needle holding body at front end and a hand-held operating handle (8) at rear end, the needle holding body comprises a couple of chucks (1) and (2) moving coaxially along a straight line, occlusal surfaces matching each other are provided between the chuck (1) and (2); an slope angle is formed between the occlusal surfaces and the principal axis of the needle holder; the chuck (2) is fixed on bottom of a hollow external tube (3), the chuck (1) is fixed on bottom of a pull rod (4) sleeved into the external tube (3) and movably connected to the external tube (3). According to the invention, the angle fixing type needle holder may alter holding angle of the needle in certain range such that the needle is hard to slidably drop or rotate in condition of small notch on body surface; and the needle holder may reliably suturing at deep position without damnifying tissue around.

The present invention discloses one kind of bagged cement soil and its engineering application. The bagged cement soil has the advantages of both cement soil and bagged soil, including wide material source and only needing small amount of cement and knitted bags; high compression strength of the structure up to 1 MPs; needing small work area and less disturbance on slope; no environmental pollution; low cost; needing no adhesive; etc.

The invention discloses an early-strength cement soil as well as a preparation method and application thereof. The early-strength cement soil is composed of the following components in parts by weight: 23-25 parts of water, 65-75 parts of soil, 0.5-1 part of a quick-setting anti-permeability agent and 5.5-7 parts of cement, wherein the quick-setting anti-permeability agent is a mixed powder material of fly ash and water glass, and the mass ratio of the fly ash to the water glass is (90-95): (5-10). The early strength cement soil has the advantages of high early strength, short curing time, short construction period, extremely strong fluidity and self-sealing property, controllable construction quality and good impermeability.

A floor structure assembled with inner keel and outer formwork, including side formwork, bottom formwork, shaped steel keel, stirrups, main reinforcement, sleeves and connecting bolts. This kind of floor structure assembled with inner keel and outer formwork uses steel keel to construct a kind of truss. In the construction stage, it is used as a force-bearing structure to bear the load in the construction stage; Steel bars participate in the overall stress of the structure; at the same time, on the side wall of the inner keel, a certain number of connection holes will be prepunched along the length direction according to a certain modulus. Through the connecting bolts, the formwork, inner keel truss, The steel skeleton is connected into a whole to form a stable side and bottom closed system, which is convenient for concrete pouring.

The invention relates to a roadway construction method, particularly relates to a spray anchor net hanging construction method capable of being used for roadway surrounding rock support, and solves the net hanging problem of steel plastic grilles in roadway engineering. The method comprises the following steps that the flatness of surrounding rock is determined, loose broken stones on the surfaceof the surrounding rock are cleared, the width of the steel plastic grilles is determined, drilling is carried out, the steel plastic grilles are laid sequentially and symmetrically according to the sequence of an arch crown, an arch waist, a side wall and a footing, an anchor rod is installed, the installation quality is checked, and hanging supplementing is carried out. Through the net hanging method, the roadway construction working face is saved, the roadway net hanging efficiency is improved, the labor intensity of construction personnel is reduced, the stability of the roadway surrounding rock is guaranteed, and the safety and high efficiency of roadway excavation are ensured.

The invention discloses a connecting device for burying a pile casing and a construction method. The connecting device comprises a connector connected with a rotary drilling rig, an oil pump cylinderlocated in the pile casing is connected to the lower portion of the connector, a first hydraulic oil pump and a second hydraulic oil pump are arranged at the upper end and the lower end of the oil pump cylinder correspondingly, a first tray moving in the axial direction of the oil pump cylinder is arranged at the bottom of the first hydraulic oil pump, a second tray moving in the axial direction of the oil pump cylinder is arranged at the top of the second hydraulic oil pump, a plurality of mechanical arms arranged in the radial direction of the oil pump cylinder are arranged between the firsttray and the second tray, and supporting plates abutting against the inner wall of the pile casing are arranged at the ends, away from the oil pump cylinder. When the first tray and the second tray move close to each other, the mechanical arms drive the supporting plates to expand in the radial direction, and when the first tray and the second tray move away from each other, the mechanical arms drive the supporting plates to contract in the radial direction.