ZSDJ Directly-inserting two-way self-locking multi-functional steel pipe scaffold, "two-way self-locking scaffold" for short, is fully designed and developed by Chinese engineers. Zhenjiang Yeda Construction Scaffold Co., Ltd. owns independent intellectual property.
ZSDJ Directly-inserting two-way self-locking multi-functional steel pipe scaffold applies to civil engineering construction, bridge & culvert works, decoration & AD projects, steel structure, shipbuilding & repair projects, and stage erection, emergency rescue & disaster relief works. Also, it can meet requirement of army march course, various kinds of diversified and complex combined support, heavy-duty & complex load, support system that need quick assembly and disassembly.
ZSDJ Directly-inserting two-way self-locking multi-functional steel pipe scaffold is a brand-new multi-functional scaffold. The designer summarized the advantages and disadvantages of various domestic and foreign scaffolds, especially which of the steel pipe scaffold in the past century. Meanwhile, he collected the problems that occur during the using process of steel pipe scaffold and other steel structural support equipments, and accumulated a large amount of relevant data. Then, the designer raise a brand new design idea and design the DZDJ two-way self-locking scaffold by using modern computer technology on the principles of theoretical mechanics and space fixing geometry.
Comparing with existing traditional scaffold, ZSDJ directly-inserting two-way self-locking multi-functional steel pipe scaffold is more advanced and perfect in design, more reasonable and simple in structure, more convenient and reliable in usage, stronger and safer in carrying capacity, more diversified in function, and wider in application scope.
- Features & Design
- Scaffolds Comparison
- Setting Up
- 1. Reliable Two-way Self-locking Ability
Firstly, the locking function of the joint of horizontal pole and vertical pole is mainly achieved and ensured by its design structure, which minimizes the safe hazard by reducing operators' work in locking scaffolds.
Secondly, unlike traditional scaffold that several horizontal and vertical poles shares one interlock at a node, ZSDJ Two-way Self-locking Scaffold applies to independent and non-interfering locking. In the circumstance that one pole loosens, other poles will still work. It solves the problems of unreasonable stress of horizontal pole and makes the steel pipe mechanical strength to an extreme. Meanwhile, it makes earlier disassembling safer and more reliable.
- 2. No Flexible Parts
ZSDJ Directly-inserting Two-way Self-locking Multi-functional Steel Pipe Scaffold consists of vertical poles and horizontal poles only. These two kinds of poles are fully manufactured in Yeda factory. The advantages of no flexible parts are: first, no parts losing and damage problem, thus reduces possible economic lost; second, no flexible locking parts avoid hidden safe hazard caused by flexible locking parts of traditional scaffold.
- 3. Convenient and Fast
In using ZSDJ Directly-inserting Two-way Self-locking Multi-functional Steel Pipe Scaffold, the only thing need to do is to insert two plugs of horizontal poles into relevant rotary of a vertical pole and tap it. The assembly and disassembly speed of the ZSDJ scaffold dwarfs that of a traditional scaffold. The erection speed difference between ZSDJ scaffold and fastener steel pipe scaffold could be 10 times, while cup lock scaffold 6 times.
- 4. Reasonable Load Nature
Thanks to the two-way self-locking function, the cross point of the vertical and horizontal poles of ZSDJ Directly-inserting Two-way Self-locking Multi-functional Steel Pipe Scaffold have a high precision and reasonable load nature. The scaffold features great carrying capacity, stiffness and stability. The supporting value of each vertical pole reaches to 3-4 tons. Also, less diagonal poles are needed in this new-type scaffold comparing to traditional scaffold.
- 5. Two-way Self-locking, Free Adjustment
ZSDJ Directly-inserting Two-way Self-locking Multi-functional Steel Pipe Scaffold can match with adjustable base jack & head jack, adjustable advance disassembly equipment, cantilever beam, overhanging frame, etc. to realize multi-function. First, able to be erected on any uneven slope and stepped foundation; second, able to support stepped template and make early disassembly possible; third, disassemble partial support frame in advance, can be used to erect passage and overhang eave and wing; fourth, able to assort with erecting jungle gym, movable work platform, external bent frame, etc. to realize multi support functions; fifth, can act as storage holder, and use for erecting various kinds of stages, AD engineering scaffold, etc. The upright pole can be extended in multiples of 600mm and realizes back-head joint function. ZSDJ Directly-inserting Two-way Self-locking Multi-functional Steel Pipe Scaffold provides technical support for using large-scale standard templates and hanging, erecting & fixing new-type templates.
- 6. Standardized Product Packing
Horizontal and vertical poles in various specification of ZSDJ Directly-inserting Two-way Self-locking Multi-functional Steel Pipe Scaffold adopts standardized packing, which provide convenience to scaffold storage, loading & unloading, transportation, maintenance and repair.
Yeda have made strict enterprise standard, production process, inspection process, using instruction, product manual, etc. and provide technical support to our clients, with a purpose of the renovation of support system in construction industry.
Mechanical Property and Design Load
The node of ZSDJ Directly-inserting Two-way Self-locking Multi-functional Steel Pipe Scaffold consists of a ZSDJ rotary, ZSDJ plug, and outside circle of welded pipe.
Vertical pole is a pipe with a ZSDJ rotary welded for every 600mm and a sleeve welded at the end on basis of special technical standard; while horizontal pole is made by a welded pipe with one ZSDJ plugs at both ends of the pipe.
Setting up: Insert the ZSDJ plugs at each end of the horizontal pole into the relevant taper slot on vertical pole, and then hammer the plug to fasten it. Each ZSDJ rotary can horizontally connect with four ZSDJ horizontal poles. Vertical pole can be extended when insert it into the sleeve of another one.
Inspection on weld strength of ZSDJ plugs and welded pipe of vertical pole: no damage under 60KN;
Design Loads of Upright Pole, Horizontal Pole and Base Jack:
(1) Design load of supporting vertical pole:
Under the situation that the vertical pace of horizontal pole is 600mm, the load of upright pole in frame is Pmax=40KN;
(3) Design Load of Adjustable Base Jack, Adjustable U-Head Jack And Double Adjustable Advance Disassembly Jack: Pmax=60KN
All Kinds of Adjustable Base Jack and Head Jacks of Steel Pipe Scaffolds
They are applicable for all kinds of steel pipe scaffold such as Frame System Steel Pipe Scaffold, Heavy Ladder Type Steel Pipe Scaffold, Fastener-type Steel Pipe Scaffold, Cup-lock Steel Pipe Scaffold, etc.C
Specifications suitable for the use of Frame-system Scaffold: Φ34x400, Φ34x600, Φ34x780.
|Product Pic||Product Name||Type||Specification|
|Adjustable Screw Rod||TQ-50||38x500|
|Double-way Adjustable Screw Rod||ZQ-50||38x500|
|Early-disassembling Regulating Screw Rod||EQ-50||38x500|
|Adjustable Base Jack||DQ-40||38x400|
|Adjustable Head Jack||UQ-40||38x400|
ZSDJ Directly-inserting Double-way Self-locking Multi-functional Steel Pipe Scaffold
Names and Purposes of Components
|△LG-300||3000||17.06||Vertical force bearing pole for scaffold|
|HG-180||1800||7.63||Horizontal connecting rod the vertical pole; frame horizontal force bearing pole|
|GG-180||1800||7.63||Horizontal connection with cup-lock scaffold|
|Note: special performance marked with △|
Narrow Cantilever Beam
|TL-30||Φ48x3.5x300||Used to enlarge the working space|
Wide Cantilever Beam
|Name||Type||Specification||Adjustable Size||Theoretical Weight||Purpose|
Adjustable Base Jack
|KTDZ-40||0-400||250||4.80||A foundation that can adjust the height in the bottom of upright pole|
Adjustable U-head Jack
|KTDT-40||0-400||250||5.10||A jack that can adjust height at the top of upright pole|
Double Adjustable Advance Disassembly Jack
|SKTZCT-40||0-400||200||5.87||A double adjustable jack that can adjust and disassemble the top of the upright pole|
Comparison on Overall Properties of Various Steel Pipe Scaffolds
|Sort of Scaffold||Efficiency||Bearing Capacity||Market Share||One-off Investment||Performance|
|Fastener Scaffold||100%||100%||50%||100%||inconvenient, little carry capacity, poor stability, fastener easily lost and damaged|
|Frame System Scaffold||200%||120%||10%||130%||convenient, medium carry capacoty, weak stability, accessories easily damaged, inconvenient to transport and storage|
|Cup Lock Scaffold||300%||200%||15%||150%||convenient, great carry capacity, preferable stability, upper cup easily damaged|
|Two-way Self-locking Scaffold||400%||240%||new product in early 21th century||140%||more convenient, greater carry capacity, better stability, no accessories, convenient to storage and transport|
Comparison on Comprehensive Performance with Cup-lock and Frame System Scaffold
Comparison between Double Self-locking Scaffold and Cup-lock Scaffold
- 1. Comparison on locking modes
Cup-lock scaffold is composed of stamping lower cup and malleable iron upper cup (also called flexible fastener). During the installation of horizontal poles, the upper cup must be screwed off before inserting the horizontal pole into the lower cup and screwed on after that. The upper cup needs to be moved up and down for 8 times when installing horizontal poles in four directions, which necessitate a strong work force and long working hours.
For the Double Self-locking Scaffold, all you need to do is to insert the plug of the horizontal poles into tapered hole of rotary table on vertical pole and hammer on it. It saves time and labor for the users.
- 2. Comparison on wearing parts
During the locking of cup-lock scaffold, the workers must take the iron hammer to tap two projecting parts of upper cup casted by malleable iron. The upper cup split easily if workers hammer on the cup body. Thus the vertical pole cannot be used with other vertical poles.
As the rotary table and plug are made by cast steel, there will be no rupture when the workers hammer them.
- 3. Erection Comparison
As the upper cup of cup-lock scaffold is flexible fastener and is arranged for every 600mm, if workers accidentally erect the vertical pole, the upper cup will drop down suddenly from above and tear off the skin or even result in industrial injury.
As Double Self-locking Scaffold has no flexible fasteners or spare parts, the above situation will never occur.
- 4. Safety Comparison
As the interlocking of horizontal pole on the top of cup-lock scaffold depends on moving upper cup completely, if the horizontal pole in one direction loosens, the horizontal poles in other directions may loosen as well. This is extremely dangerous during the construction.
- 5. Comparison on Erection Area and Price
The price of Double Self-locking Scaffold is higher than cup-lock scaffold. However, for the erection area per ton, another more 5m3 can be erected for Double Self-locking Scaffold.
Comparison between Two-way Self-locking Scaffold and Frame-system Scaffold
- 1. Comparison of Spare Parts
Frame system scaffold: cross tension rod, connecting rod, bolt and adjustable rod;
Two-way Self-locking scaffold: no spare parts or moving locking parts.
- 2. Stability Comparison
Frame system scaffold: at least 2mm gap between cross tension rod and bolt connecting parts; big moving scope, poor stability and low safety factor;
Two-way Self-locking Scaffold: no gap between the plug on the cross rod when inserting into the rotary table on vertical pole. Due to design features, the plug can fit closely with the rotary table and they are integrated as a whole, which greatly enhances the stability and intensity.
- 3. Comparison of Erecting Working Efficiency
Frame system scaffold: at least 4 workers are needed to coordinate with each other during the erecting, which is time-consuming and requires a lot of labor; each piece of frame system scaffold weights 25KG, thus the erecting process may lasts for a long time and it is quite dangerous.
Two-way Self-locking Scaffold: only 2 workers are needed to coordinate with each other, which is labor and time saving. In addition, the weight of 1.8m and 1.2m vertical pole is respectively 10.52kg and 7.3kg, and the cross rod is even lighter than vertical pole, which make the installation much more simple.
- 4. Comparison of Accessory Parts
Due to the instability of frame system scaffold, steel pipe fasteners must be used to reinforce every floor of frame system during the erecting. The higher, the more fasteners should be used, which increase the working intensity, slow down the erection speed and increase the economic input & safety risk.
Two-way Self-locking Scaffold: due to its own strong stability, diagonal bracing and bottom transoms are occasionally needed during the erecting. For the height lower than 10m, no bridging is needed for reinforcement, which saves larger amount of manpower and economic input.
- 5. Storage Comparison
Frame system scaffold: as there are many small spare parts without ex-factory package, the amount checking is quite troublesome. The parts are likely to be buried in the earth or stolen during the construction and cause unnecessary loss.
Two-way Self-locking Scaffold: there are no spare parts, so there will be no losses. As we provide formal ex-factory package, the amount checking is quite convenient and simple.
- 6. Comparison of Transportation and Maintenance
Frame system scaffold: as there are many small spare parts, the transportation and maintenance are troublesome and complicated.
Two-way Self-locking Scaffold: there are no spare parts, so the transportation and maintenance are quite convenient and simple.
|Content||Cup Lock Scaffold||Doubel Self-locking Scaffold||Frame System Scaffold|
|Locking Mode||socket interlocking||directly-inserting double-way self-locking||articulated fastening|
|Structure composition||the upper cup is moving locking parts||no moving parts||cross tension rod, connecting pole, bolt and adjustable pole|
|Packing||without any standardized packing||complete standized packing||without packing|
|Material||the upper cup is brittle malleable steel material||completely welded with high-quality low carbon steel||common steel pile|
|Connecting Mode||completely depending on srtificial locking||automatic locking||complicated connection|
|Keeping and Transportation||the upper cup is easily broken||there are no spare parts and the transportation and keeping are convenient and economic||too many spare parts; easy to loss or consume; not easy for maintenance and transportation|
Confirmation for Load-carrying of Single Vertical Pole
Schematic Diagram for the Erection of Diagonal Pole Bar and Bottom Transom
Erection of Overhanging Beam
When the height of the scaffolf is more than 15m, the joints of upright poles shall be staggered and shall not be in the same horizontal pole.
Erection on Irregular Slope and Stepped Foundation
Erection of Early-disassemble System
Attentions in Using ZSDJ
- 1. Erection should be carried out in accordance with the principle of from low to high in vertical, and in turn in horizontal; disassembly should be implemented in accordance with the principle of from high to low in vertical and in turn in horizontal.
- 2. Requirement of this scaffold on ground is the same as that of other scaffolds. Please use adjustable base jack when the ground is rough. Do horizontal adjustments after the erection of the horizontal and vertical poles of first and second layer is finished: make sure that the horizontal poles at the same layer on the same plane while upright poles arranged in line before continue erecting.
- 3. Dead weight should not be considered and calculated into load until the height of the scaffold excess 10m. To ensure the overall strength and stability of scaffold, the extension joint of upright poles should not at a same horizontal plane. It is necessary to set enough bottom transom and relevant large amount of diagonal poles if the scaffold height excess 15m under the circumstance that the foundation is in normal condition (in special situation: when the foundation strength is inconsistent and the projected area is too small, bottom transom and diagonal poles should be erected even the scaffold height is less than 15m). During the setting up process of external scaffold, double frames should be erected, and wall connecting poles and bottom transom should be erected when the scaffold height excess 8m.
- 4. When this scaffold is used independently in open air, the height envelop of the project is 8m in using 1 unit while 12m in using 2units. And it's essential to set wall connecting poles and diagonal bracing. Stable wind cables are preferred when necessary.
- 5. This scaffold can conveniently mix with cup-lock scaffold, ring-lock scaffold: use a transition pole at the joint of two different kinds of scaffolds in horizontal direction; insert and connect two upright poles in vertical direction.
- 6. Prohibit throwing components and accessories of scaffold from high places in transportation, storage and using and falling or hitting it heavily. Need clean and damage inspection after using. Prevent corrosion when stored and repaint it if necessary.
Schematic Diagram on ZSDJ Two-way Self-locking Scaffold Erection