CN103628605B - A kind of large-span rib type prestressed concrete plate and construction method thereof - Google Patents
A kind of large-span rib type prestressed concrete plate and construction method thereof Download PDFInfo
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- CN103628605B CN103628605B CN201310671947.0A CN201310671947A CN103628605B CN 103628605 B CN103628605 B CN 103628605B CN 201310671947 A CN201310671947 A CN 201310671947A CN 103628605 B CN103628605 B CN 103628605B
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Abstract
A kind of large-span rib type prestressed concrete plate and construction method thereof, prestressed concrete plate includes the plate body of armored concrete, plate body includes panel, longitudinal main rib, horizontal secondary rib and steel strand wires, main rib intersects vertically with secondary rib, main rib is the smooth surface a of indent with the transition portion that connects of panel, the main muscle of prestressing force of main rib is steel strand wires, and secondary rib is the smooth surface b of indent with the transition portion that connects of panel, and the cross section of secondary rib is uniform section or the variable cross-section of two ends expansion.The height of main rib is the 1/25～1/30 of panel longitudinal length.Each main rib arranges at least steel strand wires.It is little that the present invention solves traditional concrete roof span of slab, and stress causes prestressed concrete plate discontinuity, power conduction route sudden change to cause stress to be concentrated after increasing, rib of slab end check, plate face antiarch and the technical problem of cracking；Also solve its surface curve transition unreasonable, cause the demoulding not smooth and deadweight is relatively big, the technical problem of waste steel.
Description
Technical field
The present invention relates to a kind of building element and construction method, a kind of rib type prestressed concrete plate being applied to long span building and construction method thereof.
Background technology
Concrete single-layer Columns in Industrial Buildings arrange typically still continue to use the rule formulated the fifties in last century, predominantly 6m post away from, the most gradually can not meet produce and use needs, when particularly building the Factory Building of large span, one of transformation means i.e. expand longitudinal direction post net.Expanding longitudinal post net, first need to increase the span of roof boarding, the usual span of existing prestressed concrete large roof board is 6m, sees national standard atlas " 1.5m × 6m prestressed concrete large roof board " 04G410, and prestressed concrete large roof board has
Cost is low, good endurance, the features such as maintenance cost is low, especially in humidity, the environment such as corrosion has irreplaceable superiority, but when it is applied to large-span industrial building, design reasons due to concrete face-board for room, prestressed concrete plate discontinuity after stress is increased, power conduction route sudden change causes stress to be concentrated, rib of slab end check, plate face antiarch and cracking, reduce the crack resistance of plate, and concrete face-board for room curve transition is unreasonable, it is easily caused the demoulding the most smooth, after particularly strengthening the span of concrete face-board for room, the consumption of reinforcing bar is more increased after adding deadweight, waste steel, increase cost.
Summary of the invention
It is an object of the invention to provide a kind of large-span rib type prestressed concrete plate and construction method thereof, solve traditional concrete roof span of slab little, stress causes prestressed concrete plate discontinuity after increasing, power conduction route sudden change causes stress to be concentrated, rib of slab end check, plate face antiarch and the technical problem of cracking；Also to solve its surface flatness not enough, cause the demoulding not smooth and deadweight increases, the technical problem of waste steel.
For achieving the above object, the present invention adopts the following technical scheme that
A kind of large-span rib type prestressed concrete plate, plate body including armored concrete, described plate body includes panel, longitudinal main rib, horizontal secondary rib and steel strand wires, main rib intersects vertically with secondary rib, described main rib is the smooth surface a of indent with the transition portion that connects of panel, the main muscle of prestressing force of main rib is steel strand wires, and described secondary rib is the smooth surface b of indent with the transition portion that connects of panel, and the cross section of secondary rib is uniform section or the variable cross-section of two ends expansion.
The height of described main rib is the 1/25～1/30 of panel longitudinal length.
Each main rib arranges at least steel strand wires.
Every steel strand wires use the steel strand wires of 7 strands or 3 strands steel wires.
Being additionally provided with on the longitudinal central axis line of described plate body downside surface and intersect vertically with secondary rib with high middle rib, described middle rib with main rib, middle rib is the smooth surface of indent with the transition portion that connects of panel, secondary rib.
Described secondary rib includes that limit pair rib, the first secondary rib and the second width rib, limit pair rib and the second width rib are variable cross-section, and the first secondary rib is uniform section.
Being provided with hoisting ring at corner on the upside of described plate body, the corner of downside is provided with connecting plate.
A kind of construction method of large-span rib type prestressed concrete plate, construction procedure is as follows:
Step one, the template of prestressed concrete plate prepare: be designed steel form and process, first clearing up the surface of template, then the junction joint strip between template, template carries out matched moulds, and brushing releasing agent in template；
Step 2, the cloth muscle of prestressed concrete plate: in plate, the order of cloth muscle should be indulged the order of muscle and surface horizontal bar according to built-in fitting, secondary rib mesh sheet, main rib mesh sheet, suspension ring, steel strand wires, secondary rib, main rib muscle, surface and arranges；
Step 3, to prestress wire Shi Hanzhang: during prestressing operation, being stretched to during 6Mpa start to measure steel strand wires stretch value, when reaching specified stress value, steel strand wires stretch value around here should meet the requirements, and makes a record；Lotus should be held 30 seconds when reaching regulation stress value；Then steel strand wires amount of recovery is measured during oil return；Steel strand wires amount of recovery not should be greater than 5 mm；When surface layer indulges muscle prestress, tension sequence should be carried out according to symmetrical position；And first muscle prestressing is indulged on surface to main rib top, then other surfaces are indulged muscle and are carried out stretch-draw operation by order；
Step 4, concrete perfusion: start to irrigate or started simultaneously at perfusion by middle secondary rib to two ends respectively to far-end from the limit pair rib of one end, when vibrating spear vibrates, each displacement is 150mm～200mm, vibrating spear applies plate vibrator again to vibrate plate face once after completing to vibrate, plate vibrator carries out plate face with darby after completing to vibrate and scrapes and push away plate face, then the most floating, compacting manual to plate face；
Step 5, the maintenance of concrete: after plate face plastic covering cloth, paulin, quiet stopping one hour starts for steam curing, and steam curing to ensure to heat up gently as far as possible, it is ensured that space temperature is uniform, and maximum temperature is less than 60 DEG C, and keeps eight hours continuous steam supplies；
Step 6, the form removal of concrete: reaching prescribed strength more than 75% can be with kiln discharge, form removal；
Step 7, putting of prestress wire are opened: successively cut off one end main rib or the vertical muscle on middle rib surface with water weldering, be then cut off with holding steel strand wires；Same order completes another end break the muscle；Unclamp mould termination, limit Screw arbor with nut at both-ends, and it is extracted out from template；Lay down two whole alignment pin of limit mould；Split edge mould, four hoisting rings on hanging board face make prestressed concrete plate depart from template；Lay down prestressed concrete plate two ends end mould；Plate end exposes tension reinforcing steel bar cleaning cut off, stay outward 5mm；
Step 8, standing are deposited, entrucking after water seasoning.
Compared with prior art the invention have the characteristics that and beneficial effect:
In the present invention by type design that main rib on plate body, secondary rib and panel transition connection portion are divided for being smoothly connected curved surface, prestressed concrete plate is more uniformly stressed, power conduction route will not suddenly change because of plate shape, reducing stress to concentrate, the cracking resistance of plate is greatly improved.
Secondary rib in the present invention is designed to different section forms, improves smooth-going and the smoothness on plate surface, it is simple to the demoulding in prefabrication process.
The muscle of being advocated of the main rib in the present invention uses high-strength prestressed steel strand wires, give full play to the characteristic of steel strand wires, solving the technical problems such as rib of slab end check after stress increases, plate face antiarch and cracking, the span making rib type prestressed concrete plate can be to 12 meters, it is allowed to additional evenly load is up to 5kN/m2, decrease the consumption of reinforcing bar, little by 50% from the cast-in-situ reinforced concrete slab of the identical span of anharmonic ratio, not only can make roof boarding, and can be used for floor, reasonable stress, safety economy.
Accompanying drawing explanation
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the A-A profile of Fig. 1.
Fig. 3 is the B-B direction side view of Fig. 1.
Fig. 4 is the enlarged drawing of C node in Fig. 2.
Fig. 5 is the enlarged drawing of D node in Fig. 2.
Fig. 6 is the schematic diagram of F-F section in Fig. 5.
Fig. 7 is the enlarged drawing of E node in Fig. 2.
Fig. 8 is the schematic diagram of G-G section in Fig. 7.
Fig. 9 is the structural representation of the embodiment of the present invention two.
Reference: 1-panel, 2-main rib, 3-pair rib, 3.1-limit pair rib, the secondary rib of 3.2-first, 3.3-second secondary rib, 4-middle rib, 5-hoisting ring, 6-connecting plate, 7-smooth surface a, 8-smooth surface b.
Detailed description of the invention
Embodiment one is shown in Figure 1, a kind of large-span rib type prestressed concrete plate, plate body including armored concrete, described plate body includes panel 1, longitudinal main rib 2, horizontal secondary rib 3 and steel strand wires, main rib 2 intersects vertically with secondary rib 3, described main rib 2 is the smooth surface a7 of indent with the transition portion that connects of panel 1, the main muscle of prestressing force of main rib 2 is steel strand wires, described secondary rib 3 is the smooth surface b8 of indent with the transition portion that connects of panel 1, and the cross section of secondary rib 3 is uniform section or the variable cross-section of two ends expansion.
Shown in Figure 1, the board size that is designed and sized to of plate body can be designed as 1.5m × 12.0m (H × L) by the present embodiment, the maximum height of main rib and secondary rib all changes with the longitudinal length of panel and changes, owing to span is bigger, see shown in Fig. 2, Fig. 4～8, in order to the demoulding is convenient, the secondary rib cross section of diverse location differs, secondary rib 3 includes the secondary rib 3.2 of limit pair rib 3.1, first and the second width rib 3.3, limit pair rib 3.1 in Fig. 4, the second secondary rib 3.3 in Fig. 7～8 are variable cross-section rib, and the secondary rib 3.2 of first in Fig. 5～6 is uniform section.
Seeing shown in Fig. 1, Fig. 3, the height of described main rib 2 is the 1/25～1/30 of panel 1 longitudinal length.Each main rib 2 arranges at least steel strand wires.Every steel strand wires use the steel strand wires of 7 strands or 3 strands steel wires.
The steel strand wires arranged in each main rib in the present embodiment use the steel strand wires of two 7 strands of steel wires, and respectively 1 × 7 Ф 12.7 or 1 × 7 Ф 15.2, steel strand wires are novel high-strength steel strand wires, and steel strand wires strength standard value is 1860N/mm2。
Embodiment two is shown in Figure 9, unlike enforcement one, the plate width of embodiment two reaches 3000mm, so being additionally provided with on the longitudinal central axis line of plate body downside surface with main rib 2 with high middle rib 4, described middle rib 4 intersects vertically with secondary rib 3, and middle rib 4 is the smooth surface b of indent with the transition portion that connects of panel 1, secondary rib 3.
Being provided with hoisting ring 5 at corner on the upside of described plate body, the corner of downside is provided with connecting plate 6.
Optimized design, with the plate in model cross section, the configuration of large-span rib type prestressed concrete plate of the present invention, main muscle quantity of reinforcement is used to obtain effective reduction, normal use short-term laod test value and bearing capacity examination design load to increase significantly, see following test data:
| Plate cross section | Plate is conducted oneself with dignity | Main muscle quantity of reinforcement | Normal use short-term laod test value | Bearing capacity examination design load |
| 1.5m×9.0m | 2.1kN/m2 | 3.081kg/m2 | 5.10kN/m2 | 7.80kN/m2 |
| 1.5m×9.0m | 1.95kN/m2 | 1.468kg/m2 | 4.00kN/m2 | 5.45kN/m2 |
| 1.5m×10.0m | 2.3kN/m2 | 2.936kg/m2 | 5.40kN/m2 | 8.16kN/m2 |
| 3.0m×9.0m | 1.75kN/m2 | 2.275kg/m2 | 4.60kN/m2 | 5.91kN/m2 |
| 1.5m×12.0m | 2.65kN/m2 | 2.936kg/m2 | 5.71kN/m2 | 7.32kN/m2 |
Particularly, board size is designed as 1.5m × 12.0m, plate deadweight 2.65kN/m2, main muscle quantity of reinforcement 2.936kg/m2, can realize normally using short-term laod test value 5.71kN/m2, bearing capacity examination design load 7.32kN/m2, and two 15.2 steel strand wires are set in each main rib.
After preresearch estimates uses novel high-strength steel strand wires, every square metre of roof boarding about can save 1kg steel；After expanding roof boarding span to 12m, the deadweight of plate certainly will be increased, little by 50% from the cast-in-situ reinforced concrete slab of the identical span of anharmonic ratio, make the novel large-span rib type prestressed concrete plate of the present invention have vitality.
Increasingly extensive in the production application of building trade because of its degree of safety and energy-saving effect along with high tensile reinforcement, the large span sheet material developing use novel high-strength reinforcing bar meets building energy conservation and the developing direction of new energy development utilization that current China each department every profession and trade is vigorously advocated, the development of new template is favorably improved component quality, save steel, cost-effective, meet the international trend of current energy-saving and emission-reduction low-carbon economy.
A kind of construction method of large-span rib type prestressed concrete plate, construction procedure is as follows:
Step one, the template of prestressed concrete plate prepare: be designed steel form and process, first clearing up the surface of template, then the junction joint strip between template, template carries out matched moulds, and brushing releasing agent in template.
Step 2, the cloth muscle of prestressed concrete plate: in plate, the order of cloth muscle should be indulged the order of muscle and surface horizontal bar according to built-in fitting, secondary rib mesh sheet, main rib mesh sheet, suspension ring, steel strand wires, secondary rib, main rib muscle, surface and arranges.
Step 3, to prestress wire Shi Hanzhang: during prestressing operation, being stretched to during 6Mpa start to measure steel strand wires stretch value, when reaching specified stress value, steel strand wires stretch value around here should meet the requirements, and makes a record；Lotus should be held 30 seconds when reaching regulation stress value；Then steel strand wires amount of recovery is measured during oil return；Steel strand wires amount of recovery not should be greater than 5 mm；When surface layer indulges muscle prestress, tension sequence should be carried out according to symmetrical position；And first muscle prestressing is indulged on surface to main rib top, then other surfaces are indulged muscle and are carried out stretch-draw operation by order；Surface is indulged muscle prestressing value and is as the criterion with Pressure gauge indicating value 3Mpa；Indulging muscle stretch value with surface to check, elongation special messenger should should check that the position of built-in fitting suspension ring is the most correct at 15-20mm after the prestressing end of job again.
Step 4, concrete perfusion: concrete-agitating carries out metering stirring in strict accordance with match ratio, the concrete-agitating time is not shorter than 2 minutes, send concrete should detain spade feeding when entering rib with spade and enter mould；The perfusion limit pair rib from one end starts perfusion to far-end or is started simultaneously at perfusion by middle secondary rib to two ends respectively, when vibrating spear vibrates, each displacement is 150mm～200mm, really distinguish that concrete no longer sinks and do not has a large amount of bubble to glow and be jolt ramming, forbid when vibrating to touch shake steel strand wires, template, vibrating spear applies plate vibrator again to vibrate plate face once after completing to vibrate, plate vibrator carries out plate face with darby after completing to vibrate and scrapes and push away plate face, then floating, compacting manual to plate face, three groups of test blocks are made, with plate maintenance with plate.
Step 5, the maintenance of concrete: after plate face plastic covering cloth, paulin, quiet stopping one hour starts for steam curing, and steam curing to ensure to heat up gently as far as possible, it is ensured that space temperature is uniform, and maximum temperature is less than 60 DEG C, and keeps eight hours continuous steam supplies.
Step 6, the form removal of concrete: reaching prescribed strength more than 75% can be with kiln discharge, form removal.
Step 7, putting of prestress wire are opened: successively cut off one end main rib or the vertical muscle on middle rib surface with water weldering, be then cut off with holding steel strand wires；Same order completes another end break the muscle；Unclamp mould termination, limit Screw arbor with nut at both-ends, and it is extracted out from template；Lay down two whole alignment pin of limit mould；Split edge mould, four hoisting rings on hanging board face make prestressed concrete plate depart from template；Lay down prestressed concrete plate two ends end mould；Dismounting end mould must finally be carried out, and forbids to dismantle end mould when roof boarding is without departing from bottom girder mould；Plate end exposes tension reinforcing steel bar cleaning cut off, stay outward 5mm, the anchor ring on the broken end steel strand wires after break the muscle, intermediate plate are moved back anchor and cleaning；Anchor ring, intermediate plate are carried out routine inspection；It should be made after cleaning to keep sea surface oil slick state in case using.
Step 8, standing are deposited, entrucking after water seasoning.
First pad point plate end is selected away from suspension ring 150mm at when depositing, under add cushion block and deposit in ground grading；Cushion block pad point must be leveled up and down, and become a vertical line with ground.Corner pads, must not be unsettled.When becoming buttress to deposit onboard, stack the most often buttress and may not exceed five pieces.Cushion block size length and width, thickness should be not less than mm × 60,120mm × 100 mm.
Require to carry out normal wet curing according to apparatus for concrete member curing；When temperature in winter is higher than 5 DEG C, every day is no less than twice water seasoning.
Require as follows for concreting in cold weather stirring:
Winter construction produces under conditions of temperature is relatively low, and the aggregate used by mixing concrete should clean, and must not contain ice, avenge, freezes the easy bursting by freezing material such as block and bark and grass roots.In the winter time construction answer Jiang Shui, sand, stone to heat；The material water temperature of entrance blender is no more than 40 DEG C, and sand temperature must not exceed 40 DEG C, and stone temperature must not exceed 35 DEG C.Forbid in aggregate with ice, avenge and freeze block etc..
Cement must not directly heat, and deposits standby before using in being preferably transported into brooder.Application hot water or steam flush blender before stirring.Non-ice-melt block must not be had in mixing drum.
Being: first add the water of half to be subsequently adding stone, sand, cement and second half water and stir in order to avoid concrete glues tank feeding sequence, when stirring, water directly must not contact with cement.
During ready-mixed concrete, the mixing concrete time should extend 50% than the mixing time that room temperature specifies, the time must not be shorter than 2.5 minutes.The temperature of concrete batching system should be advisable with 15-25 DEG C, temperature during discharging the most preferably less than 10 DEG C, and molding temperature must not be less than 5 DEG C.
Require as follows for concrete Maintenance in Winter:
After large roof slab concrete perfusion, plastic covering fabric width kiln plays the i.e. entrance maintaining process stage, and large roof slab demoulding kiln discharge is maintenance to be terminated, large roof slab steam curing be divided into quiet stop, heat up, constant temperature, cooling four-stage；Whole process ensures 11 hours time.Specifically it is assigned as:
Quiet stop: the time: one hour；
Require: open 20% micro-valve steam supply 1 hour, mainly resist extraneous cold temperature.
Heat up: the time: two hours；
Require: quiet stop micro-supply after 1 hour, open valve 60% steam supply 2 hours.
Constant temperature: time: seven hours；
Require: 100% Open valve, keep 7 hours continuous steam supplies.
Cooling: time: one hour；
Require: valve closing, keep 1 hour.Valve closing is carried out after half an hour for the first time.
Thermometric: reaching one hour to carry out second time thermometric, temperature measurement location is on plate span centre plate face.
Carry out the component reaching kiln discharge condition, according to following operation:
Can be with kiln discharge when kiln temperature is down to 40 DEG C.
The plastic covering cloth demoulding answered by the component of kiln discharge, it may be assumed that maintenance Polypropylence Sheet wouldn't be opened, and carries the Polypropylence Sheet demoulding, winches to stack place in the lump and deposits, open after new board concrete irrigates again, and shifting is put on new plate.
If kiln discharge temperature at that time is less than 0 DEG C; should can the kiln discharge demoulding or curing time is extended again 1 hour when kiln temperature is down to 30 DEG C; the finished product depositing in scene should hide warming placement with Polypropylence Sheet, should take measures to carry out the finished product deposited humidification if desired and heat maintenance.
Claims (6)
1. a large-span rib type prestressed concrete plate, plate body including armored concrete, described plate body includes panel (1), longitudinal main rib (2), horizontal secondary rib (3) and steel strand wires, main rib (2) intersects vertically with secondary rib (3), it is characterized in that: described main rib (2) is the smooth surface a(7 of indent with the transition portion that connects of panel (1)), the main muscle of prestressing force of main rib (2) is steel strand wires, described secondary rib (3) is the smooth surface b(8 of indent with the transition portion that connects of panel (1)), the cross section of secondary rib (3) is uniform section or the variable cross-section of two ends expansion；
Each main rib (2) arranges at least steel strand wires；
Described secondary rib (3) includes limit pair rib (3.1), the first secondary rib (3.2) and the second width rib (3.3), and limit pair rib (3.1) and the second width rib (3.3) are variable cross-section, and the first secondary rib (3.2) is uniform section.
A kind of large-span rib type prestressed concrete plate the most according to claim 1, it is characterised in that: the height of described main rib (2) is the 1/25～1/30 of panel (1) longitudinal length.
A kind of large-span rib type prestressed concrete plate the most according to claim 1, it is characterised in that: every steel strand wires use the steel strand wires of 7 strands or 3 strands steel wires.
A kind of large-span rib type prestressed concrete plate the most according to claim 1 and 2, it is characterized in that: be additionally provided with on the longitudinal central axis line of described plate body downside surface with main rib (2) with high middle rib (4), described middle rib (4) intersects vertically with secondary rib (3), and middle rib (4) is the smooth surface of indent with the transition portion that connects of panel (1), secondary rib (3).
A kind of large-span rib type prestressed concrete plate the most according to claim 1, it is characterised in that: being provided with hoisting ring (5) at the corner on the upside of described plate body, the corner of downside is provided with connecting plate (6).
6. the construction method according to the large-span rib type prestressed concrete plate described in any one in Claims 1 to 5, it is characterised in that construction procedure is as follows:
Step one, the template of prestressed concrete plate prepare: be designed steel form and process, first clearing up the surface of template, then the junction joint strip between template, template carries out matched moulds, and brushing releasing agent in template；
Step 2, the cloth muscle of prestressed concrete plate: in plate, the order of cloth muscle should be indulged the order of muscle and surface horizontal bar according to built-in fitting, secondary rib mesh sheet, main rib mesh sheet, suspension ring, steel strand wires, secondary rib, main rib muscle, surface and arranges；
Step 3, to prestress wire Shi Hanzhang: during prestressing operation, being stretched to during 6Mpa start to measure steel strand wires stretch value, when reaching specified stress value, steel strand wires stretch value around here should meet the requirements, and makes a record；Lotus should be held 30 seconds when reaching regulation stress value；Then steel strand wires amount of recovery is measured during oil return；Steel strand wires amount of recovery not should be greater than 5 mm；When surface layer indulges muscle prestress, tension sequence should be carried out according to symmetrical position；And first muscle prestressing is indulged on surface to main rib top, then other surfaces are indulged muscle and are carried out stretch-draw operation by order；
Step 4, concrete perfusion: start to irrigate or started simultaneously at perfusion by middle secondary rib to two ends respectively to far-end from the limit pair rib of one end, when vibrating spear vibrates, each displacement is 150mm～200mm, vibrating spear applies plate vibrator again to vibrate plate face once after completing to vibrate, plate vibrator carries out plate face with darby after completing to vibrate and scrapes and push away plate face, then the most floating, compacting manual to plate face；
Step 5, the maintenance of concrete: after plate face plastic covering cloth, paulin, quiet stopping one hour starts for steam curing, and steam curing to ensure to heat up gently as far as possible, it is ensured that space temperature is uniform, and maximum temperature is less than 60 DEG C, and keeps eight hours continuous steam supplies；
Step 6, the form removal of concrete: reaching prescribed strength more than 75% can be with kiln discharge, form removal；
Step 7, putting of prestress wire are opened: successively cut off one end main rib or the vertical muscle on middle rib surface with water weldering, be then cut off with holding steel strand wires；Same order completes another end break the muscle；Unclamp mould termination, limit Screw arbor with nut at both-ends, and it is extracted out from template；Lay down two whole alignment pin of limit mould；Split edge mould, four hoisting rings on hanging board face make prestressed concrete plate depart from template；Lay down prestressed concrete plate two ends end mould；Plate end exposes tension reinforcing steel bar cleaning cut off, stay outward 5mm；
Step 8, standing are deposited, entrucking after water seasoning.
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| CN103953194B (en) * | 2014-05-15 | 2016-01-06 | 中航天建设工程有限公司 | A kind of variable-section variable gradient concrete in mass guiding gutter construction method |
| CN109052148A (en) * | 2018-08-23 | 2018-12-21 | 中国二十冶集团有限公司 | Production method using steel strand wires as the pre-buried suspension hook of I beam |
| CN109339323A (en) * | 2018-10-22 | 2019-02-15 | 中国十七冶集团有限公司 | A kind of assembled integral hollow floor structure system and its construction method |
| CN109441004A (en) * | 2018-12-27 | 2019-03-08 | 鲍威 | A kind of fibre cement compound sandwich multi-ribbed plate |
| CN109914801A (en) * | 2019-03-26 | 2019-06-21 | 南通大学 | A kind of vertical entire body Slate hanging construction method of alien invasion |
| CN116905813A (en) * | 2023-07-17 | 2023-10-20 | 中冶检测认证有限公司 | Inverted U-shaped prestress steel beam pouring system and method for containment vessel of nuclear power station |
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| CN200946349Y (en) * | 2006-09-11 | 2007-09-12 | 郁立方 | Prestress concrete multiple-rib plate |
| CN203716371U (en) * | 2013-12-12 | 2014-07-16 | 中国建筑标准设计研究院 | Large-span rib type prestressed concrete plate |
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