3409 results about "Steel bar" patented technology

A member for in-situ casting the reinforced concrete is composed of two halves, which are fastened together to form a hollow thin-wall member used for in-situ casting hollow floor slab, roof, wall, etc. Said member is made up by die pressing. Its advantages are high strength, low cost, and convenient transportation.

A novel method for rapidly assembling a low-cost energy-saving house with precast columns, beams and slabs comprises the steps of preparing house columns, beam molds and built-in reinforcing steel bars or profiled steel bars, pouring concrete grout into the molds, high-speed rotating in a centrifuge, curing, and demolding to obtain precast reinforced concrete columns and beam components; and inserting the precast columns on a cup foundation element, passing the precast beams through the preformed pores on the precast column, lapping precast floor slabs on the precast beams, and embedding wall slabs inside the embedding grooves of the precast beams, so as to form the major structure of the rapidly assembled low-cost energy-saving house. The inventive method has the advantages of application to industrial production, no air holes in components, high density, high strength, long service life, standardized production, low production cost, low time and raw materials consumption, rapid house construction speed, and high quality; and is a novel energy-saving house construction method in the construction field.

The invention relates to an energy-saving system for a reinforced concrete outer-casting built-in heat insulation wall body structure and a construction method thereof, which can effectively solve the problems of external wall heat insulation of a high-rise building with high heat insulation requirement and cracking and falling of a heat insulation layer. The system is produced by a wall body and reinforcing steel bars in the wall body which are cast by concrete. The method comprises the following steps that: a reinforcing steel bar frame of the wall body is produced and arranged, namely parallel vertical reinforcing steel bars and indoor floor-connecting board tie bars perpendicular to the parallel vertical reinforcing steel bars are bound together, a grid board is hoisted and externally suspended outside the vertical reinforcing steel bars of the wall body, and is bound with the vertical reinforcing steel bars of the wall body by hooked bars and binding steel bars as well as framework positioning bearing bars, then a framework is arranged on the framework positioning bearing bars and is firmly bound with reinforcing steel bars of beams and boards of a floor, lapping bars are reserved, a heat insulation grid board is firstly arranged, then reinforcing steel bars of corbel brackets of a balcony and an air conditioning board external wall are bound, finally the concrete is cast, the curing is performed, and the framework is removed to repair the structure. The system has good heat insulation effect, energy conservation, environmental protection, simple method, and huge economic benefit and social benefit.

A hole-forming member for in-situ casting the reinforced concrete is such a one used to combine a whole cavity. The connecting parts are used to combine two or more said members to form a hollow thin-wall member. Its advantages are high strength, low cost and high construction speed.

The invention relates to an integrally fabricated box-shaped multi-ribbed composite floor, and belongs to a prefabricated concrete structural component. The integrally fabricated box-shaped multi-ribbed composite floor is characterized in that the composite floor mainly comprises bottom transverse reinforcement bars, bottom linkage reinforcement bars, lower ribbed beam longitudinal ribs, ribbed beam stirrups, bottom longitudinal reinforcement bars, shutterings, truss ribs, flanges, top transverse reinforcement bars, wedge-shaped grooves and a concrete layer, wherein the bottom linkage reinforcement bars, the bottom transverse reinforcement bars, the lower ribbed beam longitudinal ribs, the bottom longitudinal reinforcement bars, the ribbed beam stirrups, the top transverse reinforcement bars and the truss ribs form a steel reinforcement framework of the composite floor; the concrete layer is poured with a conventional concrete pouring method, the flanges are arranged at the bottoms of the front side and the rear side of a concrete slab body, the connecting position of two composite floors forms a U-shaped groove by the flanges, and crack pouring of post-poured concrete is facilitated; and the wedge-shaped grooves are formed in the front side part and the rear side part of the concrete slab body at intervals respectively, the wedge-shaped grooves between every two adjacent composite floors form shear keys, and the shearing resistance between the composite floors is increased.

The invention relates to the technical field of fabricated concrete frame structures, and discloses a pre-stressing-force fabricated concrete-frame-joint connecting structure and a construction method thereof. The pre-stressing-force fabricated concrete-frame-joint connecting structure comprises a prefabricated concrete column, a prefabricated concrete superposed beam, a composite floor slab, a post-tensioned pre-stressing tendon, an anti-bending and energy-consuming reinforcing steel bar and a shear-resistant and high-strength reinforcing steel bar, wherein the post-tensioned pre-stressing tendon, the anti-bending and energy-consuming reinforcing steel bar and the shear-resistant and high-strength reinforcing steel bar are connected with the prefabricated concrete column and the prefabricated concrete superposed beam. A beam post-pour layer of the prefabricated concrete superposed beam and a slab post-pour layer of the composite floor slab are poured integrally, the inner portion of a beam column seam between the prefabricated concrete superposed beam and the prefabricated concrete column is filled with high-strength crack-pouring binding materials, the anti-bending and energy-consuming reinforcing steel bar and the shear-resistant and high-strength reinforcing steel bar are laid in the beam post-pour layer of the upper portion of the prefabricated concrete superposed beam, and the anti-bending and energy-consuming reinforcing steel bar is located above the shear-resistant and high-strength reinforcing steel bar. According to the pre-stressing-force fabricated concrete-frame-joint connecting structure and the construction method thereof, efficient construction can be achieved, the anti-seismic property and the progressive-collapse-resistant capability are good, and post-earthquake repairing is facilitated.

The invention relates to a dry type joggle frame structure. The structure comprises beam node components, each beam node component comprises a prefabricated column and a prefabricated beam which are cast into one piece, the prefabricated column and the prefabricated beam are prefabricated reinforced concrete components, the upper and lower ends and the column connection points of the prefabricated column are provided with reserved steel bars, the upper-end column connection point is provided with a column head, the lower-end column connection point is provided with a column cap in cooperation muff-coupling with the column head, the column head and the column cap are connected with the preserved steel bars; two ends of the prefabricated beam and the beam connection points are provided with joggle heads which are connected with the steel bar in the prefabricated beam. During the assembly process, the dry type joggle frame structure is environmentally friendly, and the construction noise and the building dust can be effectively reduced. The economic performance is excellent, the man power, materials and time are saved, the application range is wide, and the dry type joggle frame structure can be used both in industrial and civil buildings.

The invention discloses a water-base anti-rust agent composed of 30% to 75% film-forming agent, 0.5% to 6.0% inhibitor, 2% to 16% accessory ingredient and water. Bonding force of film layer to basal body is improved by adopting acrylic ester emulsion or water-base polyurethane emulsion as film-forming substance associated with components of inhibitor, accessory ingredient, etc. The water-base anti-rust agent is brushed on steel surface to form continuous compact protection layer, isolating steel surface from oxygen and water vapor effectively, for long lasting rust prevention. The anti-rust period of steel piece might be more than one year. The protecting film is quite compact, which maintains fundamental color of steel piece invariable. User can process next step of treatment directly without removing the protecting film, which reduces tiresome process of removing anti-rust coat. Operation modes include soaking, spraying, brush coating, etc. The invention is incombustible, nontoxic and environment-friendly. Contents of free formaldehyde, heavy metal and volatile organic meet qualified criteria. Bond strength of twice-brushed deformed steel bar to concrete is more than non-brushed test piece.

The fully prefabricated assembled steel-steel concrete structure includes two kinds of assembling forms. The first one is fully prefabricated assembled steel column-steel concrete structure, and its prefabricated steel column consists of H-shaped steel column, reinforcing concrete ribs, supporting steel plate and prestress-shearing force friction nodes with shear resisting strips. The second one is fully prefabricated assembled prefabricated steel pipe-concrete column-steel concrete structure, and the prefabricated steel pipe-concrete column consists of steel pipe with square cross section, micro expanding high strength concrete cast inside the steel pipe and shear resisting strips attached to the outer wall of the steel pipe to form preshearing force-friction type nodes. The present invention has raised antiseismic performance, area utilization, construction efficiency, fireproof performance, low cost and small member size, and is suitable for various buildings.

The invention provides an integrally-assembled concrete structural system adopting a steel bar lapping mode and relates to a concrete part system. Effective lapping degree of parts is reserved according to common cast-in-place steel bar concrete calculation and design, designed common concrete filling (pouring) is adopted after prefabricated parts are installed in place in the field construction process, the lapping length of the parts is required to be considered when the parts are dismantled, steel bars and steel bar plugging-in grooves with considered lapping length are reserved according to the design and construction requirements when the parts are manufactured, the parts are arranged in place in construction and installation according to the requirements after the prefabricated parts are transported to a field, and concrete is filled (casted) according to the design requirement under the condition that the parts are ensured to be stable. Additional sleeves, spiral bars and the like are not required, accurate aligning between the steel bars and preserved holes of the parts is not required, part processing difficulty and construction installing difficulty are reduced greatly, construction cost is reduced, and a construction period is shortened.

The invention specifically discloses a bolting-grouting integrated support method for zonal disintegration of deep roadway surrounding rock, and the method comprises the following steps of: (1) after the roadway is excavated, immediately shotting concrete to close the surrounding rock, employing a high-pretightening force overstrength anchor bolt for supporting in the first disintegration zone, and arranging a steel bar net on the inner wall of the roadway surrounding rock and shotting concrete again; (2) applying a pretightening force anchor cable on the top plate of the roadway surrounding rock such that the anchoring end of the anchor cable is located in the deep intact rock mass, arranging a steel I-beam closely to the surrounding rock, passing the anchor cable through the shotcrete, the steel I-beam and a yielding ring and fixing the anchor cable on the inner wall of the roadway surrounding rock by using an anchor cable lock, thereby realizing coupling and supporting of the anchor bolt and the anchor cable; and (3) according to the monitoring result of the zonal disintegration of the surrounding rock, performing the delayed anchor bolt support for about 20-30 days, and performing grouting reinforcement on each disintegration zone by virtue of long and short combined injection pipes or a hollow sectional spiral grouting anchor bolt. The bolting-grouting integrated support method is capable of effectively performing bolting-grouting integrated reinforcement on the disintegrated surrounding rock of the deep roadway and thereby obviously enhancing the stability of the roadway.

The invention relates to a hyper-branched polycarboxylate high-efficiency water reducing agent and a preparation method thereof. The water reducing agent is prepared by polymerizing one of tert-butyl acrylate and methyl tert-butyl acrylate with sodium methyl-acryl sulfonate and allyl polyethenoxy ether to form a copolymer main chain, and then performing condensation polymerization on one of acrylic acid and methacrylic acid with ethylene diamine to form a hyper-branched polyamide structure which is grafted to two ends of the main chain. The preparation method comprises the following steps: (1) preparing the sodium methyl-acryl sulfonate into solution with DMF, and heating the solution in a nitrogen atmosphere; (2) dissolving the other two monomers and an initiating agent into the DMF to prepare mixed solution, and dripping the mixed solution into the step (1) to react for 1 to 20 hours; (3) adding a condensating agent CDI after the reaction and performing condensation reaction by using N-methyl morpholine as an organic base, the ethylene diamine and the acrylic acid as the monomers and the DMF as a solvent; and (4) performing vacuum distillation to remove the residual monomers and the solvent, and refluxing for 2 to 5 hours by using methylene chloride solution of trifluoroacetic acid to obtain the water reducing agent. The hyper-branched polycarboxylate water reducing agent has the advantages of low admixture, high water reducing rate, small slump loss, good compatibility with cement, no corrosivity to steel bars, strong frost resistance and the like.

The invention provides a control method of an intelligent tension system and the intelligent tension system. The method is characterized by including the steps that a loading speed control unit is built and used for detecting pressure of an oil inlet, and the pressure, monitored in real time, of the oil inlet is compared with preset pretightening force of each stage; a prestressing tendon extending amount control unit is built and used for detecting the displacement value of a prestressed steel bar in real time in the tensioning process and the displacement value of the prestressed steel bar in set holdup time after the prestressed steel bar reaches set tension force of each stage; tensioning values of different jacks are compared after first-stage tension; control signals of different stage conditions in the tensioning process are converted into electromagnetic motions and frequency converter rotation speed control requirements; according to signals fed back by a pressure sensor and a displacement sensor in the tensioning process, the related control commands undergo fuzzy conditioning. The control method and the system have the advantages of improving data measuring precision and construction efficiency, reducing labor intensity of construction workers, reducing cost, improving labor efficiency, eliminating safety hidden risks of the construction workers, and enabling the whole tensioning process to be finished at a time.

The invention discloses a pre-fabricated concrete box culvert, the assembly structure thereof and an assembly method. The invention can ensure that the mortar is completely filled on a connecting surface of the pre-fabricated concrete box culvert, thereby furthest reducing the pre-stress damage caused by the sliding when the reinforcing steel bar is fixed, and allowing the pre-fabricated concrete box culvert to be assembled into a structure with extremely strong adhesion force, firmness and reliability, furthest reducing the loss of the bundled reinforcing steel bars and avoiding the damage to the structure.

The invention belongs to the technical field of architectural profiles and particularly relates to a double corrugated web steel box composite beam. The sectional shape of the invention is composed of two symmetrically arranged corrugated webs, a top flange and a lower flange. The top flange is parallel with the lower flange, the web is vertical to the top flange and the lower flange, the web and the flange are connected by single-side fillet joint, and the web has periodically repetitive trapezoidal wave or sinusoid wave along the length direction. The top of the composite beam is a reinforced concrete wing plate and a profiling steel plate. The top flange, the reinforced concrete slab and the profiling steel plate are connected each other by male pins, and a transverse reinforcement can be additionally used for the connection between the reinforced concrete wing plate and the profiling steel plate. The invention can replace the traditional hot rolled flange beam, H-beam composite beam and welded steel box composite beam; furthermore, the invention has wider application than the flange beam and the H-beam composite beam, and can realize maximization to be used in special fields and special places, including the construction of wide-span industrial and civilian buildings and wide-span bridges, etc.

The invention relates to an assembly light frame large-scale building sheet material and relative preparation, wherein said invention comprises: two plates and one core plate clamped between them; said core plate comprises a light frame at the edge to form sealed edge structure, and light thermal-insulated material filled into the chamber surrounded by said light frame; the plate and the light frame are connected via self-threading screw. And the preparation comprises filling type, rolling type and model compress type. The inventive sheet is preformed with light keel, which can confirm better structure of room, with anti-wind, anti-vibration and anti-theft functions (it arranges steel bar network inside the plate).

The invention discloses a steel bar concrete beam reinforcing structure with a partially restrained steel truss, comprising upper angle steel, lower angle steels, a web batten plate, a bottom steel plate, an anchored steel plate, a shear resistant anchor bolt and a bolt, wherein the upper angle steel, the lower angle steels, the web batten plate and the bottom steel plate are spliced to form an opened steel truss for tightly hooping a beam to be reinforced, the lower angle steels are respectively arranged at two lower corners of the beam to be reinforced and are connected with each other by the bottom steel plate, the upper angle steel is mounted between the beam to be reinforced and a slab, and is connected with the lower angle steels by the web batten plate, the anchored steel plate is arranged in the slab and is connected with the shear resistant anchor bolt arranged in the slab, and the shear resistant anchor bolt is connected with the upper angle steel by the bolt in a pre-fastening mode. The steel truss and the steel bar concrete beam form two load bearing protection lines, so the bearing capacity of the steel bar concrete beam meets the reinforcing design requirement, and the safety of a member and a structure can be ensured.

The invention discloses a high-efficiency crushing device for recycling construction waste, which includes a machine body, a first motor, a first connecting rod, a second connecting rod and a movable jaw plate are symmetrically arranged on the top of the body, and the first motor is driven to connect the first connecting rod. The other end of the first connecting rod is hinged with the second connecting rod, and the other end of the second connecting rod is hinged with a movable jaw plate. The bottom of the movable jaw plate is connected to the top of the body through a hinge. An inclined plate is fixed in the lower part of the body, a conveying device is arranged under the inclined plate, an iron removal device is arranged above the conveying device, an arc-shaped plate is fixed under the left end of the conveying device, and a secondary crushing device is arranged under the right end of the arc-shaped plate. The invention is provided with a first motor, a first connecting rod, a second connecting rod and a movable jaw plate, which can pre-shred the construction waste, and is provided with an iron removal device to remove metals such as steel bars and steel bars in the construction waste to avoid Damage the device and affect the service life of the device.

Pretensioning steel strand wire concrete tubular pile consists of annular tubular concrete pile body and end plate. Inside the tubular concrete pile body there equips steel bar framework. The prestressing force main reinforcement in the steel bar framework is steel strand wire, whose end crosses the stretching hole at the end to produce anchor. The screwy reinforcement helically encircles to fix prestressing force main reinforcement and set-up reinforcement as a whole. Because the quality of steel strand wire material is steady, it can not only insure the quality of the high strength prestressing force concrete tubular pile, but also the pile is provided with the advantages of high material strength, strong prestressing force, high bending strength and good carrying capability.

The invention discloses a construction method of a concrete structure external wall with a built-in thermal insulating layer. The construction method comprises the steps of putting polystyrene plates among multiple layers of reinforcing meshes, obliquely inserting reinforcing steel bars in three-dimensional direction, welding the steel bars to obtain a thermal insulating wire rack board, and simultaneously pouring concrete on both internal and external sides to form a structural system. The specific construction method comprises the steps of: fabricating the thermal insulating wire rack board, banding external wall boundary members (embedded columns) and external wall board steel bars, installing the thermal insulating wire rack board, connecting steel bars around the thermal insulating wire rack board and laying pipelines, installing and fixing steel struts on the inner side of the thermal insulating wire rack board and cushion blocks on the outer side of the thermal insulating wire rack board, erecting inner templates for an external wall, erecting outer templates for the external wall, testing, simultaneously pouring concrete at both the internal side and the external side, removing templates, and curing. The inventive concrete structure external wall with the built-in thermal insulating layer has the advantages of solid connection, good sound insulating and thermal insulating effects, long service life, simple construction method, good shock resistant effect, short construction time, environmental friendliness, low construction cost, and good social and economic benefits; and is suitable for various urban residential buildings.

A cold forging steel excellent in grain coarsening prevention and delayed fracture resistance and method of producing the same are provided that enable omission of a step of annealing or spheroidization annealing before cold forging and improvement of delayed fracture resistance of a high-strength component used with a heat-treated surface. The cold forging steel is a steel of a specified composition having dispersed in the matrix thereof particles of not greater than 0.2 mum diameter of one or more of TiC, Ti(CN), NbC, Nb(CN) and (Nb, Ti)(CN) in a total number of not less than 20/100 mum2. The method of producing a cold forging steel includes the steps of heating this steel to not lower than 1050° C., hot-rolling the steel into steel wire or steel bar, and slowly cooling the steel at a cooling rate of not greater than 2 C./s during cooling to a temperature not higher than 600° C. to obtain a steel having dispersed in the matrix thereof particles of not greater than 0.2 mum diameter of one or more of TiC, Ti(CN), NbC, Nb(CN) and (Nb, Ti)(CN) in a total number of not less than 20/100 mum2.

The present invention discloses combined pile section with reinforced horizontal bending strength and rigidity and its construction method. Within certain length range with heavy horizontal load, the pile body is coated with one large size and high strength reinforcing member and structural filling material is then used to combine the pile section and the coating into one integral. The construction process includes the steps of inserting one large sized sleeve, which may be a prefabricated reinforced concrete tubular pile, permanent steel tube and other protecting tube with steel bar cage; constructing the base pile inside the protecting tube, filling structural stuffing in the reinforcing section; and constructing pile head based on the design. The said combined pile has greatly raised horizontal bearing capacity and rigid.

The invention relates to a method for ecologically breeding black-bone chickens in a medlar garden, comprising the following steps: 1. medlar garden construction: the growth of garden nursery stocks takes more than one year, strong stocks have no pest infection, row spacings of planted plants are 1 m*2 m, 333 plants are planted in per mu, forage grass or/and vegetables, i.e. lucernes, small rapes, small Chinese cabbage, and the like are interplanted among rows of medlar plants, a net-shaped iron-wire protective guard with the height of 1.5 m is constructed around the medlar garden, and movable water tanks and forage tanks are placed in the medlar garden; 2. simple chicken house construction: a finished chicken house is in a steel bar pipe frame and asbestos tile structure, a roof structure is in a monoclinic way, the height of circumferential asbestos tiles is 1.5 meters, the upper part of the chicken house is provided with a steel plate net, and the chicken house is internally provided with the forage tanks and drinking bowls in a matching way; 3. brooding, grazing and manual forage supplement: chicks are collected to be brooded for 4-5 weeks and then bred in the medlar garden for 8-10 weeks without original temperature, and two batches of the black-bone chickens are grazed and bred every year; 4. breeding density: the number of each batch of the black-bone chickens which are averagely bred on the earth per mu is properly controlled between 100 and 150; and 5. a breeding way: an all-in and all-out breeding way is carried out for the same batch of the black-bone chickens.

The invention relates to a construction technology of a tower silo slip-form, in particular to the slip-form construction technology of the large-diameter shallow tower silo, which comprises the procedures: the binding of a cylindrical wall with a steel bar, the fixing and location of a ring and a hoisting frame, the location of an internal molding board and an external molding board, the erection and location of an internal platform and an external operating platform, the erection of a jack, the location of a hydraulic control platform and the installation of an oilway, the casting of the concrete, the climbing of the molding board and the removal of a slip-form system. The invention is characterized in that the internal operating platform in the procedure of the erection and location of the internal and the external operating platform has a multisectional trusses in structure, and is arranged along the inner periphery. The invention has the advantages that: 1. the construction and flow are relatively simple, the operation is convenient and the technology is advanced as the operating platform has no internal middle ring; 2. the invention is material-saving, has good overall performance and is convenient for assembling or disassembling in particular to the climbing construction of large-diameter shallow tower silo; the verticality and the torsion is easy to be controlled, the quality is easy to be guaranteed and the speed can be expedited; 3. compared with the traditional climbing form operating platform, the internal operating platform can save 50 percent of material cost.

The invention relates to a test mode of a titanium alloy smithing technological parameter. The test mode has the steps that: (1) multi-forging various-direction smithing is performed on a titanium alloy steel bar to obtain an original structure which is as uniform as possible; (2) the steel bar after substituting forging is made into stocks under the temperature ranging from 30 to 50 DEG C below a Beta transformation point (TBeta); (3) the stocks are preheated for 1 to 2 hours under the temperature which is about 200 DEG C, and then are coated with special lubricant Ti-6 of a titanium alloy die forming; (4) the surface of a die is preheated until the temperature is more than 350 DEG C, the die forming is finished with 1 to 2 fire levels, and three different deformation amounts of 10 percent, 35 percent and 60 percent are obtained on a forgeable piece; (5) after the forgeable piece is processed through heat treatment, various types of mechanical property samples are get from the parts with different deformation amounts, and the quantitative relation between the parameters such as the smithing temperature, the heat preservation time, the deformation amounts, etc. and the mechanical property as well as microscopic constitutions is determined. A technician can adjust the sizes of the stocks according to the quantitative relation, and ensure reasonable deformation amounts on a stamp work, thereby obtaining the optimum matching between the plasticity and the fracture toughness.

The damper unit 10 is applicable to structures for seismic energy dissipation. The damper unit 10 comprises, a lower beam 11, an upper beam 12, a left column 21, a right column 22, axially yielding dampers 41, 42 functioning as an energy dissipating means, a left post-tensioned steel bar 31, and a right post-tensioned steel bar 32. The left and right post-tensioned steel bars 31 and 32 are inserted in the left and right columns 21 and 22, respectively. Upper ends of the steel bars 31 and 32 are connected with the upper beam 12. Lower ends of the steel bars 31 and 32 are connected with the lower beam 11. The columns 31 and 32 are semi-rigid connected with the upper beam 12 and the lower beam 11 by compressive forces generated from the steel bars 31 and 32. Therefore, the damper unit 10 possesses both self-centering and seismic energy dissipation characteristics.

The invention relates to a strengthening concrete frame structure. A frame column is formed by integrally pouring a stem steel rib and peripheral column reinforced concretes, wherein the concrete is poured inside the stem steel rib; studs which are vertical to the steel rib are arranged on the periphery of the stem steel rib; the stem steel rib is embedded in the column reinforced concrete structure; the reinforced steel bar in the column reinforced concrete structure comprises a stud, a column stirrup and a drag hook; the beam tendons at the upper part of a beam column joint are a main penetration tendon and a column winding tendon; when the upper column winding tendon passes by the stem steel rib in the frame column, the column winding tendon is bent outwards at a gradient of 1: 6; and when the upper main penetration tendon penetrates a reserved hole on the stem steel rib in the frame column, one end of a lower beam tendon is anchored in the column reinforced concrete structure or is bent upwards. The invention solves the problems that the reinforcing steel bar in the steel rib-concrete structure beam column joint areas is difficult to penetrate the stem steel rib, the concrete is inconvenient to pour and vibrate and the pouring effect is inferior. The structure of the invention can be widely applied to a long span high-rise frame structure.

The invention relates to a dual-way steel-laminated slab concrete composite floor, belonging to a new large span floor structure, comprising a cross steel beam, a prefabricated slab and a later pouring concrete layer, wherein the cross steel beam is an I shaped cross section or box section steel beam; the prefabricated slab, a common reinforced concrete slab or a prestressed concrete slab, is held on the cross steel beam and covered on the grids between the steel beams; the later pouring concrete layer is concrete poured on the prefabricated slab and the steel beam. The invention has the advantages of low structure height, high bearing capacity, stiffness, bilateral support effect, saved forming procedure and formwork, reduced the wet work amounts of site concrete, favorableness to the three-dimensional construction, and shortened construction period.

The invention discloses a two-stair five-step excavation construction method for a shallow-buried large-span soft plastic clay tunnel, relates to an excavation construction method for the shallow-buried large-span soft plastic clay tunnel and aims to solve the problems of a large number of working procedures, slow construction process, high cost, frequent disturbance of surrounding rock, large surrounding rock deformation and long inverted arch enclosing time existing in the conventional excavation technology for a soft ground tunnel. The method comprises the following steps of: excavating anupper bench and preserving core soil, namely preserving a soil body along a contour line while excavating by using an excavator, excavating and arranging an expanded arch springing at the position ofthe arch springing; supporting the upper bench, namely enclosing an excavation surface by primarily spraying concrete, arranging an arch springing support cushion, erecting a profile steel lagging jack, laying steel bar net slices, constructing a locking foot anchor pipe and ejecting concrete to designed thickness; excavating and supporting a lower bench in a staggered way, namely excavating leftand right parts in a staggered way, tightly connecting a section steel frame of a side wall with an arch steel frame, constructing a reinforcing mesh and a foot locking anchor pipe and ejecting concrete; excavating core soil; and excavating and supporting an inverted arch. The method is suitable for construction of the shallow-buried large-span soft plastic clay tunnel.

A ribbed steel bar truss concrete superimposed sheet and a ribbed steel bar truss concrete construction method comprise a prefabricated layer and a superimposed layer. The prefabricated layer comprises a steel bar truss net and a concrete layer arranged on the lower portion of the prefabricated layer. A steel bar truss is composed of a lower chord steel bar, an upper chord steel bar and a web member steel bar connecting the lower chord steel bar and the upper chord steel bar. The steel bar truss net is composed of the steel bar truss, an additional steel bar shelved on the lower chord steel bar and vertical to the steel bar truss and a longitudinal steel bar in the lower portion of the prefabricated layer and parallel to the lower chord steel bar of the steel bar truss in the same plane. A plurality of concrete ribs are arranged on the upper end face of the concrete layer along the longitude direction and arranged in parallel. The superimposed layer is a cast-in-place concrete layer arranged on the prefabricate layer. A steel rib net is buried in the superimposed layer. The superimposed layer is connected with the upper chord steel bar in the steel bar truss of the prefabricate layer. The superimposed layer comprises an upper longitudinal bar and the additional steel bar vertical to the upper chord steel bar, and poured into a whole with the upper chord steel bar in the steel bar truss of the prefabricate layer and the web member steel bar. The ribbed steel bar truss concrete superimposed sheet and the ribbed steel bar truss concrete construction method have the advantages of being reasonable in steel bar overall arrangement, good in economy, convenient to hoist and transport, and effective in solving problem of sheet joint cracking.