Do not know how to use the wheel scaffolding construction technology, you can look at this, the package will!

Time: 2018-03-15
Summary: Fastener-type steel pipe brackets are the most popular choice for the template brackets during construction. Today we are going to introduce the wheel-type bracket. The wheel-type bracket is based on the fastener-style steel pipe formwork, and the horizontal and vertical rods and the pole connection method are changed to the form of the wheel disc and the latch self-locking. Can greatly improve the erection efficiency of the formwork frame, and it has been well applied in civil architecture.

First, the construction characteristics of the wheel scaffolding scaffolding

1. The structure design of the wheel-type bracket is ingenious and has good mechanical properties;

2. Safe and reliable, no moving parts, convenient management, transportation and storage, long service life;

3, component standardization, modularization, erection and removal quick and easy;

4, easy to use, can increase construction efficiency and reduce labor intensity

5. The short steel pipe that is discarded can be processed on its own, turned waste into treasure, saves materials, and meets the requirements of green construction.

Second, the wheel scaffolding construction operating conditions

1. Determine the length (model) of poles and crossbars according to the structural form, height, etc. of the project, and purchase or rent enough erection materials according to the requirements for material turnover.

2. There are a sufficient number of ordinary steel pipes and fasteners on site to prepare for erecting scissors and other components.

3, the support surface should have sufficient strength, and a good contact with the pole, in order to facilitate the transfer of force.

4, floor line has been completed.

5, pole erection position has been calibrated.

6, has been doing a good job of supporting the construction of the formwork and after the review, approval of the adoption, and workers have targeted technical disclosure.

Third, the construction of wheel scaffolding scaffolding

The wheel type scaffold is a supporting system composed of a steel pipe pole with a wheel, a steel pipe with a plug, and an adjustable jack. The erection process is basically the same as the fastener-type scaffolding, except that the uprights and the crossbars are fixed, and the link between the uprights and the crossbars is also less fixed by the movable fasteners.

1, process flow

 2. Putting materials into play

According to the structure of the project and the height of the building, it is required to customize or lease the poles and crossbars of the corresponding length (model). There are two factors to consider when choosing a product: Applicability and Turnover. There are three types of poles: LG-240 (2.4m long), LG-180 (1.8m long), and LG-120 (1.2m long). There are five types of crossbars: HG-30 (0.3m long), HG-60 (0.6m long), HG-90 (0.9m long), and HG-120 (1.2m long). The long cross bar is generally selected from LG-240, depending on the height of the floor, other models can be selected. The short cross bar is generally selected HG-90 and HG-120.

3, positioning line

After the floor concrete has reached the completion strength of 1.2Mpa or more, if the pole is erected on the foundation after the foundation treatment reaches a certain strength, the control line is drawn according to the axis dimension of the construction drawing, the control network is established, and the elevation control line is measured, according to the already measured The control line determines the position of the beam and marks the erection position of the pole.

4, laying wood or laying base

In order to enlarge the bearing area of ​​the bearing surface at the bottom of the pole and ensure that the bearing surface of the pole is subjected to uniform force, it is necessary to lay down the studs and place the base at the bottom of the pole.

5, set up a rod, crossbar

The components of the wheel scaffold are shorter, and generally one person can set up the pole and the crossbar. When erecting the pole, first place the pole on the pre-placed mat, insert the plug of the pole into the pole wheel of the pole, and insert the other end into the wheel of the other pole. The length of the pole is directly inserted into the Φ58mm × 4mm × 200mm bushing welded at the end of the pole, ensuring the connection between the upper and lower poles and effective stress transmission.

6, set the scissors support

After the erection of the uprights and crossbars as required, a vertical scissor support should be set up on the four sides of the support frame and at the middle of the frame. The vertical support should be set from bottom to top. For the template supports above 4m, a horizontal bracing is set at both ends of the template support and every fourth row of poles starts from the top floor and every two steps. Four corners hold diagonal braces. Facade Scissors As usual.

7, connection, reinforcement board bottom frame body

After the formwork frame has been erected to form a stable force receiving body, the board bottom frame body will be set up. The connection between the bottom frame body and the upright pole adopts the form of an adjustable top bracket.

8, laying the top bamboo plywood

When the sub keel (gimmick) and the main keel (double steel pipe) under the slab are installed according to the elevation control line (the height can be adjusted by the adjustable top bracket), the top panel bamboo plywood can be installed. When installing the top plate form, use nails to fix it with the bottom plate and ensure that the form plate is securely mounted, flat, and tightly stitched.

9, check and acceptance

(1) Whether or not the formwork is strictly implemented according to the plan and whether the construction measures are reasonable. The connection between the pole and the crossbar is firm.

(2) After the template is laid, correct the flatness and the floor elevation.

10, pouring the top slab concrete

After the installation of the formwork and the reinforcement of the steel bar, the concrete of the top slab was poured and the concrete was placed on the concrete when the top slab was poured. The hidden troubles were eliminated in time.

11. Demolition of the formwork

The order of demolding of the formwork is generally the demolition of the rear support; the non-load-bearing part is removed first, and the load-bearing part is removed later.

The requirements for the concrete strength to be achieved when the beam formwork is removed are referred to the relevant regulations.

Before the demolishing of the formwork support, the demolition personnel shall be given a technical disclosure, and the written procedures shall be completed.

The demolition work must be carried out step by step from top to bottom. It is forbidden to work up and down at the same time. The height difference in the demolition shall not exceed two steps.

When the formwork support of a multi-story building is removed, no less than two layers of the formwork support above the removal layer shall be retained.

When disassembling the wheel-type scaffolding, pay attention to the order of dismantling the cross-bar, uprights, and scissors and other components. It is forbidden to throw the components to the ground, and it is necessary to pass them to the ground and put them neatly.

The dismantled components shall be promptly inspected, refurbished, and maintained, and the unqualified components shall be removed.

IV. Construction Quality Control of Wheel Scaffolding

1. The formwork must be designed and accepted in accordance with the relevant specifications and standards. The expert must demonstrate the tall formwork project as required, and if necessary, prepare an emergency plan.

2, build the quality of the component itself

The steel pipes used for poles and crossbars shall not have cracks, scabs, delaminations, misalignments, hard bends, burrs, indentations and deep scribes. Variations in the outer diameter, wall thickness, end face of the steel pipe, etc.; corrosion depth of the steel pipe surface; bending deformation of the steel pipe should comply with relevant rigid regulations. The welding quality of the pole and the wheel, the welding quality of the crossbar and the plug satisfies the requirements. The welding strength of the pole wheel is 60KN, and the welding strength of the crossbar plug is 25KN.

3, the strength of bearing surface

Regardless of whether the pole is erected on the foundation or on the floor that has been poured, it must be calculated to meet the strength requirements. If not satisfied, take measures to reinforce the lower layer. The bottom of the pole must be provided with a base or pad.

4. The connection points of the vertical bar and the horizontal bar must be fastened, and the erection of the vertical bar should be accurately placed on the positioning line. All uprights and crossbars form a firm overall joint force.

5. The erection of the scissor support is strictly carried out according to the relevant requirements of the fastener type scaffold.

Five, wheel buckle scaffold construction note

In addition to complying with the requirements of the Fastener Frame Specification, the following should also be considered:

1, the construction requirements of the template bracket

(1) Two-way horizontal bars must be set between the poles in steps to ensure sufficient design rigidity in both directions;

(2) When there is a large difference between the load of the beam and floor slab, different pole spacings can be used, but it is only advisable to change the distance in one direction and the other direction.

2, the design of pole step

(1) When the structural load of the frame body does not change greatly at different heights of the vertical pole, the equal step can be set;

(2) In the middle part, there is a high-strength stratum or stent, and the axial force varies greatly along the height distribution. The variable stride length setting can be used, but the change should not be excessive;

(3) The step height of the high support bracket is 0.9--1.5m, which should not exceed 1.5m.

3, the overall design of the frame

(1) It is forbidden to use the wheel scaffolding for tall formwork projects. The height of the support frame should be ≦5m;

(2) In any case, the top and bottom of the high support frame (the setting layer of the sweeping bar) must be provided with a horizontal reinforcing layer, and the horizontal reinforcing layer is provided with a horizontal diagonal bar or scissors;

(3) The formwork frame must have a vertical and horizontal 4-span or more continuous unit body; parts that do not conform to the distance between the uprights should be erected using a fastener-type steel pipe formwork frame, and be completely connected with other frame bodies.

4, the design of scissors support

(1) Scaffolding should be set up along the outer facade of the bracket, and the scissor support should be erected with a fastener-type steel pipe;

(2) The center can be set every 10-15m according to the needs and the size of the frame.

5, the design of the top support point

(1) The support should adopt the jacking method, prohibiting the horizontal rod from directly bearing the vertical load;

(2) The length of the cantilever arm of the template support pole extending out of the top level horizontal rod is strictly prohibited to exceed 650mm, the length of the adjustable bracket insertion pole shall not be less than 250mm; the screw of the U-shaped bracket shall not exceed 200mm at the top of the steel tube.

6, support frame erection requirements

(1) Ensure that the vertical deviation of the vertical pole and horizontal deviation of the crossbar are less than the requirements of the “Fastener Frame Specification”;

(2) The design of foundation bearings must meet the requirements of bearing capacity.

7. Requirements for construction use

(1) Carefully designing the concrete pouring scheme to ensure balanced loading during the construction of the formwork support. It is best to use a pouring method that expands from the middle to both sides;

(2) Strictly control the actual construction load not to exceed the design load, and there must be corresponding control measures for the exceeding of the maximum load. Steel and other materials cannot be piled on the top of the bracket;

(3) In the process of pouring, people were sent to inspect the support and support conditions and found that sinking, loosening, and deformation were resolved in time.

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