What is Double Row Scaffolding? What is single row scaffolding and double row scaffolding

Double row scaffolding.

There are two rows of upright poles, connected by crossbars, which exist independently of the building and are used for frame structures.

The area of exterior walls, exterior wall doors and windows exceeds 40% of the entire exterior wall area, rubble exterior walls, and hollow bricks.

exterior walls, infill exterior walls, etc.

Specifications for the erection of double-row scaffolding:

1. Selection of materials and specifications.

According to the requirements of JGJ59-99 specification, steel pipe erection, steel pipe size is 48, and steel fasteners are used.

2. Erection size.

a. The total height of the erection scaffold should change with the construction progress, and the height should exceed the construction layer meters.

b. According to the on-site practice situation, double-row scaffolding is adopted, and the inner side of the frame body pole is fully blocked and enclosed by a safety dense mesh network. The first layer of flat nets is erected at a height of meters, and the layer nets are set up with the construction progress, and the interlayer nets are set every 6 meters.

Single row vs. double row, as the name suggests, single row scaffolding: scaffolding with only one row of upright poles, the other end of which rests on the wall structure with transverse flat poles. Now it is rarely used, and can only be used as temporary protection; From the profile, the double-row scaffold has two rows of vertical poles, large crossbars, small crossbars, floor-mounted, cantilevered, and climbing, which are selected according to the engineering situation.

Double-row scaffolding is a scaffold with vertical steel pipes or bamboo inside and outside, and if there is only a row of steel pipes or bamboo scaffolding outside, it is a single-row scaffolding.

1. The allowable deviation of the verticality of the upright rod is not greater than 1 200 of the frame height, and the verticality of the full height is not more than 100mm. 2. The horizontal deviation of the same row of large crossbars is not more than 1 300 and not more than 50mm of the total length. 3. The fastener used to connect the large crossbar should have the opening facing the inside of the frame and the bolt pointing upward.

The opening of the right-angle fastener shall not be facing downward, and the internal and external vertical rod connection shall require butt fasteners, and lap joints shall not be used. 4. The distance between the fasteners at both ends of the scissor brace diagonal rod and the pole node is not more than 200mm, and there are 1---2 connection points in the middle. The length of the joint is lap joint, the lap length is 1 meter, and it is locked with three rotary fasteners.

5. The connecting rod should be perpendicular to the scaffold, and be braced at the junction of the vertical rod and the large crossbar as much as possible. 6. The ends of each rod of the scaffold should be greater than 10cm to prevent the rod from slipping. 7. The settlement of the base is less than 2mm, the step deviation is 20mm up and down, the longitudinal deviation is 50mm left and right, and the transverse deviation is 20mm before and after.

Scaffolding with only one row of upright poles, the other end of which rests on the wall structure with transverse flat poles. Now it is rarely used, and can only be used as temporary protection;

It consists of two rows of vertical poles and horizontal poles inside and outside. From the profile, the double-row scaffold has two rows of vertical poles, large crossbars, small crossbars, floor-mounted, cantilevered, and climbing, which are selected according to the engineering situation.

1. The variability of the load is large.

2. The fastener connection node is semi-rigid, and the rigidity of the node is related to the quality of the fastener and the installation quality, and there is a large variation in the performance of the joint.

3. There are initial defects in the scaffold structure and components, such as the initial bending and corrosion of the rods, the erection size error, and the load eccentricity.

Single-row scaffolding refers to scaffolding with only one row of poles, which is usually only used for protection, while double-row scaffolding belongs to the kind of scaffolding that is perpendicular to the building and has two poles to bear the load, which not only plays a protective role, but also can pass people.

1. All the frame structures of double-row scaffolding are made of rigid materials, which is also very strong and durable, and the safety factor is relatively high, and the double-row scaffolding also has the advantages of fire resistance and shockproof.

2. Handicap double-row scaffolding not only has double high-altitude anti-fall devices, but also can effectively prevent the family from falling off and the danger of people falling on the frame.

3. The whole device of the cantilever scaffold is closed, so we say that its safety performance is relatively high, and there is a small possibility of falling for the objects on the frame, which is also a safety guarantee for the construction personnel below the operation.

4. The installation of disc buckle double-row scaffolding collapse is very time-saving, and it is also quite convenient in operation, at the bottom of the building floor, one-time installation can be used many times, and the main thing is that he can climb intelligently with the building of the floor.

A single row of scaffolding has only one row of columns, which is erected with the help of a wall, on which a springboard is laid, and the vertical load is borne by the column and the wall. The double-row scaffold has two rows of columns, on which scaffolding poles are erected, springboards are laid, and the vertical load is all borne by the two rows of columns. Single-row scaffolding, also known as wall-attached scaffolding, is compared to double-row scaffolding, which only has one row of columns, and can only be erected with the help of walls.

After the erection is completed, the springboard is laid on the column, and the load is mainly borne by the single row of columns and the wall. Double-row scaffolding has two rows of columns, and all the load-bearing is carried by those two rows of columns. Because the load-bearing capacity of single-row scaffolding is not as good as that of double-row scaffolding, it is mainly used for some projects that do not require load-bearing, such as the construction of individual parts and individual components of the exterior wall, as well as the masonry and painting of the interior wall.

Single-row scaffolding (single-row scaffolding): Scaffolding with only one row of upright poles and one end of the transverse horizontal pole resting on the wall.

Double-row scaffolding (double-row scaffolding): Scaffolding composed of two rows of upright poles and horizontal poles inside and outside.

One. Single-row scaffolding and double-row scaffolding are divided according to the purpose of use.

Single-row scaffolding is generally used for interior wall plastering, painting and other projects that do not require load-bearing, and single-row scaffolding needs to support the pole against the wall.

Double-row scaffolding is generally used in masonry projects, and masonry needs to be load-bearing and drop cement or bricks.

Two. The difference between single-row scaffolding and double-row scaffolding.

Single-row scaffolding refers to scaffolding with only one row of poles, which is generally only used for protection.

The double-row scaffolding is perpendicular to the building and has two poles to bear the load, which can not only play a protective role, but also pass people.

Three. In the connection between the pole and the pole, there are the following ways of force transmission.

The support transmission force of the socket butt. That is, the upper and lower vertical rods are docked, and the connecting rods or socket tubes are used to ensure the good state of the docking;

The pin rod connected by the pin rod is shear transmitted;

Meshing force transfer of the screw connection. That is, the external thread of the inner pipe and the internal thread of the outer (sleeve) pipe mesh to transmit force.

Note: The latter two force transmission methods are mostly used in the pole connection to adjust the height requirements.

Four. Types of scaffolding made of steel pipe material.

fastener-type steel pipe scaffolding;

bowl-buckle steel pipe scaffolding;

socket steel pipe scaffolding;

portal scaffolding;

scaffolding; Hanging scaffolding, etc.

Single-row scaffolding refers to scaffolding with only one row of poles, which is generally only used for protection, and double-row scaffolding is perpendicular to the building with two poles to bear the load, which not only plays a protective role, but also passes people.

Single-row scaffolding means that there is only one row of brackets outside the wall, and the crossbar of the scaffold is placed on one side of the bracket and the other side is placed on the wall, and the width is included.

Double-row scaffolding means that there are two rows of brackets outside the wall, and the crossbars of the scaffold are placed on the brackets on both sides, and the width is in.

There are no specific provisions on the height of single and double row scaffolding, the provision of width is that the higher the height, the narrower the width, and the specific width should be determined in combination with the actual situation of the project, because the frame and the shear wall are different, and the type of formwork used is not the same, different types of engineering construction use scaffolding for different purposes, the majority of bridge support frames use bowl buckle scaffolding, there are also portal scaffolding, and the main structure construction of the ground scaffold uses fastener scaffolding.

Precautions for using scaffolding:

1. The materials set on the shelf surface should be stacked neatly and steadily, without affecting the construction operation and personnel traffic.

2. In the operation, it is forbidden to dismantle the basic frame rods, integral rods, connecting fasteners, safety nets and wall parts of the scaffold at will, and when it is necessary to temporarily dismantle it due to operational requirements, it must be agreed by the supervisor to take corresponding temporary reinforcement measures, and after the completion of the operation, it will be restored in time.

3. Workers should pay attention to my safety protection and the safety of others in the operation on the shelf, avoid collisions, flashes and falling objects, strictly prohibit playing on the shelf and sitting on the railing and other unsafe places to rest, do not walk in a hurry on the shelf or do something, and avoid physical imbalance when avoiding each other.

4. Personnel must go up and down the scaffold to the access (ladder) with safety protection, and it is strictly forbidden to climb up and down the scaffold.

5. When carrying out electrical welding operations on the scaffolding, it is necessary to lay iron sheets and sparks or remove flammable materials to avoid sparks from igniting flammable materials, and at the same time prepare fire prevention measures, once the fire is fired, it will be extinguished in time.

A single row of scaffolding is a row, they have a six-foot bar with the wall to put on, and then build a springboard to carry out the work. As the name suggests, double-row scaffolding is a double-row, six-foot bar connecting two scaffolding, and then building a springboard to carry out the work.

To put it simply, single-row scaffolding is mainly used to fix the columns and wall formwork in the floor, and fix the perimeter of the column or both sides of the wall.

The double-row scaffolding is mainly a scaffolding around the building, and some steel pipes hanging on the green mesh around the building from a distance above the construction site belong to the double-row scaffolding.

JGJ130-2011 "Safety Technical Code for Fastener Steel Pipe Scaffolding for Building Construction" stipulates that the single-row scaffolding should not exceed 24m; The height of double-row scaffolding should not exceed 50 meters, etc., which is due to the provisions of construction safety. As for single-row scaffolding, you can't use it if you want to, the building structure type is fixed, the masonry structure, and the exterior wall can be used, can you use the frame structure in a single row of scaffolding?

Double-row scaffolding with a height of more than 50 meters is not only the use of double pipes, sectional unloading, sectional erection and other measures, but also belongs to the "sub-project with greater risk than a certain scale", and must be prepared in accordance with the provisions of the Ministry of Housing and Urban-Rural Development's "Measures for the Safety Management of Sub-projects with Greater Risk" [2009] No. 87, and the special safety construction plan shall be prepared and approved by the expert group.

shall not exceed 24 meters Safety Technical Code for Fastener Steel Pipe Scaffolding for Building Construction JGJ130-2001 Single-row scaffolding is not suitable for the following situations: (1The thickness of the wall is less than or equal to 180mm; .2.Architecture.