Technical map for installation of reinforced concrete frame - course

Contents

1 SCOPE OF APPLICATION

2 ORGANIZATION AND TECHNOLOGY OF WORKS EXECUTION

2.1 Scope and Scope of Work

2.1.1 Preparatory works

2.1.2 Installation works

2.1.3 Auxiliary works

2.2 Selection of load-gripping and mounting devices. Calculation of load-gripping devices

2.3 Selection of installation methods. Development of wiring diagrams for variants

2.4 Selection of versions of installation cranes and determination of required parameters of installation cranes

2.5 Technical and economic comparison of installation cranes variants

2.6 Installation procedure

2.7 Calculation of brigade composition

2.8 Transport selection. Determine the required number of transport units

3 CALCULATION OF LABOR, MACHINE TIME

4 INSTALLATION SCHEDULE. HOURLY INSTALLATION SCHEDULE

5 LOGISTICS

5.1 Required quantity of materials, semi-finished products, structures

5.2 Required number of tools, equipment, accessories

5.3 Required number of machines and mechanisms

6 QUALITY CONTROL

7 SAFETY MEASURES

8 TECHNICAL AND ECONOMIC INDICATORS

LIST OF SOURCES USED

Scope of Application

The process sheet was developed for the installation of a one-story production building from prefabricated elements.

The scope of work includes:

installation works for installation of columns, crane beams, adjustment beams, trusses, coating plates, wall panels;

electric welding works;

grouting and sealing of joints.

It is assumed that the work on the construction of the zero cycle has been completed.

Characteristics:

building 3 span one-story;

2 spans of 18 m, 1 span of 30 m;

pitch of columns 6 m;

dimensions in axes 66.5 x 72 m;

height 13.8 m;

the coating is accepted as lamp-free;

the maximum weight of the structure is 16.7 tons (truss FS30A2A).

Installation works are carried out in summer conditions. The routing can be used for similar operations under the same conditions.

Technology of installation works

Description of installation works technology.

Installation works are carried out according to design estimates and pre-developed process charts.

The most important rule that must be fulfilled during installation is ensuring the stability of the mounted structures. In this regard, any installed structure cannot be released from the crane hook until it is securely fixed. The mounting sequence of the frame members must be such that the stiffness and geometrical stability of the mounted portion thereof are ensured. Taking into account this requirement, when erecting the framework of one-story industrial and other buildings, it is recommended to observe the following order: the first structures on each site are installed, between which there are connections (vertical, horizontal, etc.) - columns. Each next structural element is connected to the previously installed connecting elements provided by the project: links or temporary spacers.

Installation of each structure is carried out by implementing a comprehensive installation process consisting of the following separate processes:

1. Preparation of installation crane (selection of parking lot, preparation of gripping devices);

2. Installation workstation equipment (at a height above 1 m they equip a working platform with fencing);

3. Preparation of structure for installation, slinging, check of grip reliability;

4. Vertical and horizontal transportation of the structure;

5. Installation in design position;

6. Temporary fixation of the structure;

7. Adjustment to design position taking into account tolerances for deviations from design position as per SNiP 3.03.0187 "Load-bearing enclosing structures" (item 19);

8. Design fixation;

9. Termination of joints.

- Installation of columns

Prior to the installation of the columns, hairlines of the installation axes are applied to the upper faces of the foundations, foundation cups are cleaned of debris, soil and water, a leveling layer of rigid concrete is laid on the bottom of the cups (if this operation was not performed in advance), that is, the level of the bottom of each cup must be brought to the design (installation) horizon.

The thickness of the knockout is defined as the difference between the elevation of the installation horizon level and the actual elevation of the bottom of the foundation shell (according to the as-built diagram). To clean the cups, they are purged with compressed air from the compressor and washed with water using a hose, pumping out dirty water with a manual pump. The concrete mixture is compacted by hand ramming, or vibrators; concrete surface level in the cup is checked by levelling.

The columns are delivered to the installation site prior to installation and laid out along the work front.

The column is gripped by a unified traverse (Table 3) so that the column hangs on the crane hook in an upright position and does not have to rise to the top to disassemble it.

Making sure that the slinging is correct and reliable, we begin to lift the column. When the column is raised and in a vertical position above the foundation, we bring the column into the foundation cup, orienting its position on axial risks. When aiming the bottom of the column at risks, we first lower it so that it does not reach the bottom of the glass by 20... 30 mm; holding it on the weight, crouching with mounting slices, combining axial hairlines on the column with hairlines on the foundation, and lowering it to the bottom of the cup.

Without releasing the column from the crane hook, finally check its position in terms of axial risks. At the same time, check the column verticality, achieving its flatness along two mutually perpendicular faces. For this purpose we install plumbs along two axes of columns in mutually perpendicular planes.

After reconciliation and temporary fixation geodetic check of mounted column position in plan, height and vertical is performed. If the installation error is within the permissible limits (item 19 of SNiP 3.03.0187 "Load-bearing enclosing structures"), the column is ground in the foundation sleeve with concrete of the grade specified in the design. After the concrete of the joint has gained 70% of the design strength, the conductor is removed, the inserts are removed and used when installing other columns .

- Installation of crane beams

Reinforced concrete crane beams are installed along columns. Installation of crane beams is started after installation, alignment and final fixation of columns. Concrete at the junction of the column and the foundation shell should gain 70% of design strength by this time.

Gripping of reinforced concrete crane beams is performed by two-branch sling (Table 3).

When lifting the beam, we hold it by the haircuts from the hemp rope from striking the columns, and turn it in the desired direction before installation. The lowered beam is oriented according to the risks of the longitudinal axis on the beam and cantilever, and if there is a previously installed beam in the adjacent span, according to the risk on this beam.

When installing crane beams for the installation of the working platform at height, we use additional stairs with the platform.

After the beam is installed on the console, the level is used to check whether the top plane of the beam corresponds to the design elevation and risk on the column. Alignment of geometric longitudinal axis of beam with design axis is achieved by displacement of beam end. Vertical strength of the beam wall is checked with a plumb by hairlines on the free end of the beam. Vertical deviations are eliminated by placing gaskets under the beam.

- Installation of adjustment beams

Installation of beams is carried out only after installation with concrete in the frozen joint of the column (K-3) with the foundation of the given strength.

Before installing the adjustment beam, it must be equipped with a safety rope and braces. For slinging use crossbeam (Table 3). When lifting, its position in space is adjusted with the help of drawers. At a height of about 0.5 m above the resting places, the beam is accepted by installers, guided by axial risks and set to the design position. Then embedded parts are welded, after which the beam is disassembled.

When installing adjustment beams for the installation of the working platform at height, we use additional stairs with the platform.

- Installation of coating trusses

To install the coating truss, hairlines of the buildings axes are applied to the supporting parts of the columns (if they were not applied during geodetic survey).

Support units for trusses installation are prepared by means of hydraulic hoist on car.

The truss is captured by a traverse (Table 3).

Before lifting the truss, we install a temporary inventory spacer (Table 3) on it, with which the truss being installed is temporarily attached to the previously installed one.

The first installed truss is temporarily fixed with the help of braces, and after its reconciliation it is fixed until disassembling, welding the parts of support units of the truss and the column. In this state, it cannot be left for a long time, so during the working shift we install the second truss, check its position and fix it on the supports.

- Installation of coating plates

Reinforced concrete paving slabs on reinforced concrete paving trusses are installed immediately after fixing the trusses, which ensures the rigidity of the assembled part of the building.

Coating slabs are laid from one end of the truss to the other in a row, starting from the side of the previously installed span (coating without lights). When installing the first coating cell, the installers are on the hydraulic hoist on the car. Subsequent plates are mounted from previously laid ones. Temporary fencing is used to ensure the safety of works on the coating.

The spacer between trusses is removed after laying and welding of embedded parts of the plate laid at the spacer to the beam.

We weld the slabs to the trusses in the places provided for by the project: the first slabs are welded at four points, the next ones in at least three.

- Installation of wall panels

External wall panels are made curtain (frame-type building). The walls are installed at the end of installation and design fixation of the structures of the building frame.

Wall panels unloaded from vehicles are installed in cassettes.

Prior to installation, installation hairlines are divided to determine design position of panels in longitudinal and transverse directions and in height. Hairlines for installation of elements by height are separated from mounting horizon .

In the transverse direction of the panel, we install, aligning the inner face of the panel with the thrust face of the template; in longitudinal direction - by installation risks; by height - by the risks of elevations, aligning the thrust face of the angular template with the upper face or risk of the panel.

In plan, the panel is screwed in transverse direction and in height at two points located near its ends. Vertical alignment of panels during its installation is performed by rail-plumb. Each panel is fixed in the design position immediately after installation.

Wall panels are mounted from the hydraulic hoist on the car, slinging is carried out by a two-branch sling (Table 3). For further works (decontamination of horizontal and vertical seams, application of sealing mastic on the outside, sealing of vertical and horizontal seams between panels), a hydraulic hoist is also used on the car, which is located on the outside of the span after moving the installation crane to the next parking lot.

Termination of joints from the inner side is performed during installation. At the same time using cradles located on the outside of the span after moving the installation crane to the next parking lot. Sealing of butt joints is performed by electrical hermetizer with Butprol mastic.

Acceptance of installation works is carried out with the participation of the general contractor, the customer and the contractor. According to the results of acceptance, an act is drawn up. At the same time, the following are presented: certificates for used materials, working drawings, results of as-built geodetic surveys, measurements, acts for hidden works, work logs, certificates for necessary laboratory tests of materials.

When the facility is put into operation, the general contractor presents state commissions with executive documents, including the certificate of delivery - acceptance.

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