Quality control analysis of steel structure construction in Sheraton Hotel.

The following is the quality control analysis of steel structure construction of Sheraton Hotel brought by Zhong Da Consulting for your reference.

Recently, the Sheraton Huzhou Hotel, dubbed as the "toilet cover", won the third place in the 20 14 "Oscar" Annapolis Skyscraper Award for architecture. This project is the lowest building on the shortlist and is considered as a very bold design by the jury. The building was designed by Ma, the structural design was Shanghai Modern Architectural Design (Group) Co., Ltd., and the steel structure was completed by Seiko Steel Structure Group. The project started on May 8, 2008/KLOC-0 and was completed on September 28, 2006. The total investment is about 654.38+0.5 billion yuan.

1, project overview

Sheraton Huzhou Hot Spring Resort Hotel is located on the south bank of Taihu Lake in China. Project height 10 1.2m, width 1 16m, 23 floors above ground and 2 floors underground, with a total construction area of 65,000m2. Mainly used in hotels, integrating eco-sightseeing, leisure vacation, high-end conference and classic shopping.

The first water platinum seven-star hotel in China is the landmark building of "the ninth bay in the world" in Huzhou, China. Its refreshing ring appearance is the first in the world and the only one in China. On February 20 10, with the approval of China National Intellectual Property Administration, the hotel obtained the national design patent certificate.

Overall renderings of Sheraton Huzhou Hot Spring Resort Hotel

Main body hoisting photo

2. Structural system

The steel structure project of Sheraton Huzhou Hot Spring Resort Hotel consists of the steel frame structure of the main building, more than 20-story steel truss corridor structure and the steel roof structure of the podium lobby. Among them, the main building part of the project is in the form of twin towers A and B below 20 floors, and more than 20 floors are connected as a whole by corridors. The whole project is in the form of circular gradual transition, and the structural stress system is complex.

The steel frame of the main building of the project consists of two floors underground, 22 floors above ground and a roof frame structure, with a span of less than 9m, and the maximum span of the steel truss structure is 48m；. The elevation of the bottom structure is-10.450m, and the elevation of the top structure is 91.250m.: ; The average span of the podium steel roof structure is 35m, and the maximum span is 50m, which adopts the form of steel beam multi-ribbed floor.

3. Connection form and stress of steel structure members

3. 1 steel member statistics

(1) steel beam

(2) Steel column

(3) steel support

3.2 Component Connection Form

This project has 22 floors, with a total height of 91.250m and a standard height of 4.0m. The whole structure is mainly composed of radial frame, circumferential frame, truss, cast-in-place concrete floor slab, concrete beam and roof reticulated shell, forming a good spatial stress system. The beams and columns of the structural frame are rigidly connected, the primary and secondary beams are mainly hinged, and the peripheral steel beams are rigidly connected.

(2) The middle of the corridor is the column on the beam, which has a heavy load. Although truss is the main bearing member, its deflection control is still a constraint factor in engineering. At the same time, when the corridor is hoisted, the stability control of its segmented structure is also a difficult point.

4. Technical difficulties

4. 1, installation accuracy control

The steel structure of the outer frame of this project is arc structure, and the corridor structure adopts the method of segmental hoisting and high-altitude assembly, which controls the installation accuracy extremely high. Mainly take the following measures to solve this problem:

(1) The positioning control of steel columns mainly starts from the axis of ground foundation. When installing each steel column, always take the axis of the ground foundation as the control benchmark, and never use the next steel column to control the last steel column to avoid error accumulation.

(2) Correction measurement of the arc steel column: firstly, make the axis position of the bottom of the arc steel column coincide with the axis of the top of the previous steel column, and measure the elevation at the same time; Then the top of the arc-shaped steel column is corrected, and the arc-shaped steel column is corrected to the correct position by correcting the three-dimensional coordinates of the intersection of the top of the arc-shaped steel column and the axis.

Steel columns should be temporarily fixed in time after installation.

Embedded core tube of steel beam connector

(3) Truss ground assembly survey: use total station to accurately determine the position of jig frame at the jig frame setting point and cross it. After the jig frame is installed, the height of the top surface of the adjusting member on the jig frame is corrected with a level meter to ensure that all jig frames at the lower part of the same horizontal member are horizontal; The jig elevation at the characteristic point is determined by the level, and the jig is adjusted according to the theoretical data to make the error within the fine-tuning range.

Truss hanging column installation

Installation of truss rigid column

Hoisting of steel castings at truss

4.2, welding scheme

The general principle of welding in this project: carry out in different regions, and return to zero in each step; Unipolar double welding, bipolar single welding; Welding first and then bolting, symmetrical construction.

(1) partition, each step is zero.

That is, the axis position of each frame stiffness unit is the basic area for hoisting. After the circular tube column is in place, the beam of the corresponding floor will be hoisted. Finally, after the truss is hoisted in place in sections, it is only fixed or spot-welded with temporary connecting lugs. Check the truss axis and elevation, correct the deviation, and then weld the truss as a whole.

After all welding in each area is completed, the base of this area will be hoisted. In this process, the errors caused by the manufacture and installation of substructure components are zeroed, that is, every step is zeroed, so that errors do not accumulate.

After the secondary truss is hoisted and temporarily fixed with connecting lugs, weld the main truss. The welding sequence of the main truss is from one side to the other. This welding method can use the secondary truss as the constraint degree of the main truss to reduce the welding deformation of the main truss; At the same time, the possible thermal cracks caused by "double-knife single welding" are avoided.

(2) unipolar double welding and bipolar single welding.

Single-pole double welding is connected to the symmetrical welds on both sides of the same component, and two people are used for symmetrical welding, which requires the same welding speed and welding current and voltage parameters. Double-knife single welding refers to welding one end of the bar with strong binding force at both ends first, and then welding the other end after the weld temperature is cooled to normal temperature.

(3) Before the bolts are welded, they shall be constructed symmetrically.

In the bolt-welded joint project, the high-strength bolt is initially screwed by 30%, then welded, and the welding is finished. After the weld is cooled, finally tighten the high-strength bolt. Symmetrical construction should be adopted as far as possible for welds similar to the butt joint of truss pipes to reduce welding deformation.

Steel column welding

Sheraton Huzhou Hot Spring Resort Hotel has become a landmark project along the coast of South Taihu Lake with its ring shape, and the steel structure part of the corridor is the finishing touch, which is also the difficulty of steel structure engineering installation. During the construction process, Seiko Steel Structure Group strictly controls the quality of incoming materials, reasonably selects and equips construction machinery, and adheres to the quality inspection and acceptance system. Through the optimal design and manufacture of joints, the reasonable selection of steel can save the project cost by about 1 10,000 yuan, accounting for 2.5% of the total cost.

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