Seek the engineering scheme of high-rise building

I. Basis for compilation

Serial number name number

1 instruction manual for construction elevator

2 technical specification for safe use of construction machinery jjgj33-2001

3 safety technical specification for fastener-type steel pipe scaffold in building construction jgjg130-2001(2002 edition)

4 "Building Construction Manual", 4th edition, in reduced print.

5 Construction site layout

6 Construction drawing of this project structure

Second, the project overview

1, general situation of buildings

This project is a Class II building, with a structural safety level of Class II and a fire resistance level of Class II, and the fire resistance level of vertical members is limited to 3 hours. This project is a concrete frame-shear wall structure system, the seismic fortification category is Class C, the seismic fortification intensity is 7 degrees, the protection level of civil air defense project is Class VI, the waterproof level of underground project is Class II, and the waterproof level of roof is Class II, with a total construction area of 25161.19m2, of which the above-ground residential building18m2. The building area of the basement is 5 16 1.57m2, and the heights of the first floor, the second floor and the standard floor are 3.590m, 4.20m, 3.60m and 3.0m respectively, with a total building height of 60.03m There are civil air defense underground garages and about 76 standard parking spaces. The first and second floors are mainly commercial buildings, and the third and above floors are residential buildings.

2, the construction elevator positioning

According to the construction conditions of this project, considering the convenience of material transportation, the construction elevator can be used reasonably, and the foundation of the construction elevator is not directly set on the foundation. The construction elevator used in this project is installed on the axis of the building.

Three, the construction of elevator foundation and floor reinforcement support design

1. An SC200/200 construction elevator is installed in this project. The erection height of the elevator is L=62m, with 59 sections * * *, and the weight of each section is 140kg. The specification of the hanging cage is 3.2m× 1.3m, and the concrete foundation is 5.6m long, 4. 1m wide and 0.0m thick. The bottom of the foundation is set on the roof of C25 basement with a thickness of 180mm. See attached figure 2 for the support and reinforcement of elevator foundation.

2. Reinforcement method of elevator foundation in basement construction: At the corresponding position of the negative floor, a full-house red top frame is erected with φ48×6.5m steel pipes for support and reinforcement. The vertical spacing and horizontal spacing of steel pipe bent rods are 500mm, and 80×80mm wooden Fang is placed on the steel pipe top support to make the wooden Fang closely contact with the ground. The sweeping rod is 200mm away from the ground, and the step distance is uncertain.

3. During foundation construction, clean up the sundries on the basement roof, set out the foundation position line according to the elevator position, then tie the steel bar and pour the formwork concrete. When pouring the foundation, anchor bolt holes should be reserved, and the reserved holes should be reserved for secondary pouring and fixing of anchor bolts after the elevator debugging is completed. During foundation construction, the isolation agent should be brushed on the ground and the protective layer of foundation reinforcement should be padded. The concrete shall be vibrated and compacted, and the construction elevator shall be formally installed after the concrete strength meets the requirements. (See the instructions for specific installation and disassembly)

Four, foundation, floor and full steel pipe top frame calculation

1, total elevator weight calculation

Main technical parameters of the construction hoist: the weight of the hanging cage (double cage) is 2× 1600kg, the total weight of the guide rail frame (* * * needs 59 knots, the standard knot weight 140kg, excluding other accessories) is 59× 140kg, and the weight is 2×1. Namely142.6kn.

2. Calculation of foundation bearing capacity P

Considering the influence of dynamic load, dead weight error and wind load on the foundation, take the coefficient n=2.

Bearing capacity of foundation p = g× 2 =142.6× 2.1= 299.46kn.

The foundation made according to the maximum pressure Pmax=530KN meets the use requirements of the elevator.

3. Basic calculation

The strength grade of foundation concrete is C30, axial compressive strength fc= 14.3N/mm2, axial tensile strength ft= 1.43 N/mm2, bottom area S= 18.76m2, and foundation deadweight F =18.76× 0.335×

The calculation of the bottom surface area of the foundation shows that the bottom surface area of the foundation under axial compression should meet the following requirements

S ≥ (p+f)/fc = (299.46+157.115)/(14.3×10 ⒊) = 0.032m2 (.

4. Checking calculation of full steel pipe jacking column

The connection mode of φ48×3.5 steel pipe column is fastener butt joint. See Table 8-76 on page 520 of Building Construction Manual, 4th edition. When the cross-bar interval L= 1500mm, the allowable load [n] of the column is 30.3KN, and the number of steel pipes is 18.76/(0.5× 1.5).

Checking calculation of column stability: σ = n/(φ a) = 7330/(0.626× 489) = 23.96 n/mm2 < f = 205 n/mm2, which meets the requirements.

Where n refers to the load borne by each column (n);

A—— sectional area of steel pipe (mm2);

φ —— Stability coefficient of axial compression. According to the slenderness ratio λ = L/I =1500/15.8 = 94.937, the lookup table shows φ=0.626.

Five, the construction elevator layout and accessories

1, attachment settings

In this project, the height of the first floor is 4.2m, and the height of the second floor is 3.0m According to the specification, the first attachment point is set at the top of the second floor, and one attachment point is set every three floors. See the specification for the model and specifications of the accessories. The specific connection mode is shown in the figure.

2, construction elevator protection and connection with scaffolding

The minimum safe distance between the movable parts of the construction elevator and the fixed construction equipment shall not be less than 250mm, and a head protective shed with a height of 6m, a width of 3.6 m and a length of 4m shall be set outside the construction elevator. See the figure below for details.

Six, quality requirements

1, and the allowable deviation of surface flatness on the basis is 10 mm.

2. After concrete pouring, the foundation should be maintained in time, and the elevator installation can only be carried out after the concrete strength reaches 80%.

3. When installing the guide rail frame, theodolite should be used to measure and calibrate the elevator in two directions, and the allowable deviation of verticality is 5/ 10000 of its height.

4、

Allowable deviation (mm)

Embedded steel plate center line position 3

Center line position of embedded pipe and reserved hole 3

Location of the center line of steel dowel 5

Exposure length+10/0,0

Embedded bolt centerline position 2

Exposure length+10/0,0

Center line position of reserved hole 10

Foot-in+10/0,0

5. The elevator foundation shall be manufactured and installed according to the standard requirements in the manual. The embedded frame must be leveled with a level and connected with the foundation reinforcement.

6. The lightning protection grounding device should be connected with the grounding device of the main structure.

7. Unevenness (horizontal height difference) of four reference points of embedded frame ≤ l×11000 (l is the distance between two points, in m).

8, basic acceptance data must be approved by the technical director, supervision company signature.

9. After the foundation reaches the design strength and meets the design requirements, the next working procedure can be operated, and unqualified products are strictly prohibited.

VII. Safety Requirements and Measures

1. Installation workers should operate according to the requirements of aerial work: wear safety helmet, safety belt and non-slip shoes.

2, installation work, must be carried out under the rated load weight, no overload.

3. It cannot be installed when the wind speed exceeds 13M/S and the weather is bad.

4. During installation, objects should be prevented from falling from above the installation site to avoid multi-level operation at high altitude.

5. Set up a 3-meter safe passage of the protective shed on the side of the feed inlet on the first floor. Both sides of the channel are closed with dense mesh, and the top of the channel is protected with 50 thick boards.

6. The edge of the floor feeding platform is provided with protective railings with a height of1.5m..

7. Install a vertical open metal protective door with a height of 1800mm at the exit of the construction elevator platform, and install a tool protective door at the exit of the elevator platform. There are signs at the exit of each floor.

8. The elevator special switch box should be located near the underframe for easy operation. The feed capacity should meet the requirements of elevator direct start, and devices such as short circuit, overload, phase sequence, phase failure and zero connection protection must be set in the box.

9, elevator cage around 2.5m range should be set up solid protective railings, each floor platform channel should be smooth and firm, entrances and exits should be set up protective railings and protective doors. There shall be no obstacles around the whole process that endanger the operation.

10, the elevator anti-falling safety device shall not be disassembled and adjusted at will during use. When it is necessary to disassemble and adjust, or after using 1 year, it shall be adjusted, overhauled or appraised by the manufacturer or the designated authorized unit.

1 1. Before starting, check and confirm that the cable and grounding wire are intact and the control switch is at zero position. After the power supply is connected, check that the voltage is normal and there is no leakage. Test and confirm that the electrical interlocking devices at the limit devices, ladder cages and enclosure doors are good and reliable, and the electrical instruments are sensitive and effective. After start-up, no-load lifting test should be conducted to measure the effectiveness of the brakes of each transmission mechanism, and the operation can only be started after it is confirmed to be normal.

12. When the elevator car rises 1 ~ 2m from the ground during the first load operation of each shift, stop and test the reliability of the brake; When it is found that the braking effect is not good, it should be adjusted or repaired before operation.

13. When people or goods are carried in the ladder cage, the load should be evenly distributed and not biased. Overload operation is strictly prohibited.

14, the operator should operate according to the command signal. Signal before operation. Before the main power switch of the elevator is turned off, the operator shall not leave the operating post.

15. When abnormal conditions are found during elevator operation, stop the elevator immediately and take effective measures to lower the cage to the bottom, and the elevator can continue to run after troubleshooting. When power is found out of control during operation, press the emergency stop button immediately; Do not turn on the emergency stop button before troubleshooting.

16. When the elevator stops halfway due to power failure or other reasons, it can be lowered manually, and the manual release handle of the brake electromagnet at the end of the motor is slowly pulled out to make the ladder cage slowly slide down. When the ladder cage slides down, it must not exceed the rated running speed, and the manual descent must be controlled by professional maintenance personnel.

17. After the operation, the ladder cage should be lowered to the bottom, all the control switches should be set to zero, the power supply should be cut off, the switch box should be locked, and the ladder cage door and enclosure door should be locked.

Eight. attached drawing

Attached drawings 1 foundation details

Attached Figure 2 Construction Elevator Foundation Support Reinforcement Diagram

Figure 3 Layout of Construction Elevator