CN104328922B - High-altitude multilayer is dangled steel construction against way Hoisting Construction Technology - Google Patents

Abstract

The invention relates to the construction technology of building corridors, in particular to a construction technology for the reverse hoisting of high-altitude multi-layer suspended steel structures. A construction technique for hoisting a high-altitude multi-storey suspended steel structure by reverse method, comprising the following steps: the first step: hoisting the first truss on the inside of the n+1th floor of the left building; The second truss is hoisted on the inside of the n+1 floor; the third step: hoist the main beam between the installed pair of trusses; the fourth step: hang and install the first steel column on the n to m floors on the main beam Frame; the fifth step: hoist the first crossbeam between a pair of trusses on the n+1 floor; the sixth step: hoist the second crossbeam between the inter-span longitudinal beams on the nth floor; then the n-1 Hoist the third beam between the longitudinal beams between the spans of the floor...until the hoisting of the secondary beams between the longitudinal beams of the mth floor is completed; the seventh step: hoisting the upper chord braces and longitudinal beams of the truss; the eighth step: hoisting From n+1 to m floors, the right side picks up the beam.

Description

Construction Technology of Reverse Method for Hoisting High-altitude Multi-storey Suspended Steel Structure

technical field

The invention relates to the construction technology of building corridors, in particular to a construction technology for the reverse hoisting of high-altitude multi-layer suspended steel structures.

Background technique

At present, many buildings have a corridor structure. A corridor generally refers to a structure in which two or several high-rise buildings are connected to each other by an overhead connector. The corridor can be used as a connecting passage between two buildings, or as a Sightseeing and leisure purposes. The commonly used corridor construction method is to build two reinforced concrete structures (that is, two buildings), and then build scaffolding between the two reinforced concrete structures from bottom to top, and place the corresponding longitudinal beams, beams and other structures The parts are installed in place from bottom to top, and finally the scaffolding is removed. This method is technically mature, but there are technical problems such as time-consuming and labor-intensive scaffolding, especially the large footprint, which affects the construction period and occupies the construction site (especially when the construction site is very small), resulting in a poor construction environment. , seriously affecting the construction efficiency.

Contents of the invention

In order to solve the technical problems of large area occupied by scaffolding and low construction efficiency in the current corridor construction process, the present invention provides a reverse method hoisting construction technology for high-altitude multi-layer suspended steel structures.

The present invention is realized by adopting the following technical solutions: a high-altitude multi-storey hanging steel structure reverse method hoisting construction technology, a corridor is installed between the two built left and right reinforced concrete buildings, and the highest floor of the corridor corresponds to On the nth floor of the building, the lowest floor of the corridor corresponds to the mth floor of the building, where m<n; including the following steps:

Step 1: hoist the first truss on the inside of the n+1th floor of the left building;

Step 2: hoist the second truss on the inside of the n+1th floor of the right building;

Step 3: hoist the main beam between the installed pair of trusses;

Step 4: Suspend and install the first piece of steel column frame from n to m storey on the main beam; then hoist the first span longitudinal beam from n to m storey on the first steel column frame; then hang on the main beam Install the second steel column frame behind the first steel column frame, hoist the first inter-span longitudinal beam between the first steel column frame and the second steel column frame; then hang and install on the main beam For the third steel column frame after the second steel column frame, the second span longitudinal beam is hoisted between the second steel column frame and the third steel column frame...and so on until the last steel column frame is hoisted column frame and the last inter-span longitudinal beam, and the second span side longitudinal beam from n to m floors is hoisted on the last steel column frame; both sides of all steel column frames are connected with the inner sides of the building body on the left and right sides; all spans Both the longitudinal girders and the side girders are connected with the adjacent buildings;

Step 5: Hoist the first beam between a pair of trusses on the n+1 floor;

Step 6: hoist the second crossbeam between the span girders on the nth floor; then hoist the second crossbeam between the span girders on the n-1 floor...until the mth floor span is completed Hoisting of secondary beams between longitudinal beams;

Step 7: Hoist the upper chord braces and longitudinal beams of the truss;

Step 8: Hoist the right cantilever on floors n+1 to m.

The construction of the corridor steel structure "inverse method" according to the present invention is carried out according to the construction method of first the upper part and then the lower part, spot welding in place first, and then welding and positioning after bolt fixing. Steel trusses are made of off-site components, pre-assembled on site, and then installed by hoisting rods and pulley blocks; all steel columns, steel beams and other components are manufactured in professional factories, pre-assembled, and transported to the site by flatbed trucks , the car crane follows the loading and unloading components to the assembly platform. The hoisting in place is connected and installed with high-strength bolts, and some are manual arc welding.

Beneficial effects of the present invention: 1. The major and difficult points of this project are the on-site assembly and hoisting of steel trusses. Through comprehensive research and analysis combined with construction experience, the on-site steel structure construction utilizes the concrete floor slabs that have been constructed and have reached the mark. The assembly platform of the steel components of the corridor, and then adopt the "reverse hoisting method" construction method without scaffolding. First, the upper steel truss is hoisted, and then the lower frame columns, beams, and other structures are hoisted and installed layer by layer in a "top-down" order . Use hoist, winch and other power equipment to complete the installation with the construction plan of two pulling rods for lifting.

2. In the construction plan of the present invention, steel trusses, steel column frames and other components are assembled on the ground, and the construction is carried out by means of unitary lifting and installation, which reduces the amount of high-altitude operations to the greatest extent, meets the requirements of construction drawings for project quality, and reduces safety. Protection cost and energy.

3. Under the premise of good safety protection, it can ensure the flow operation between civil works, steel structure and steel structure, save the working surface and shorten the overall construction period of the project.

4. In terms of project cost, due to avoiding the erection of scaffolding, there will be great advantages in terms of construction period, labor input, scaffolding materials, facade of dense mesh safety net, plane protection, vertical transportation and prevention of falling from heights, etc. greatly reduced.

5. The main stress-bearing members and nodes of the steel structure have clear force action at each stage of the installation project, which conforms to the internal force characteristics and design requirements of the hanging steel structure.

6. There is no unloading process, and the construction operation process is simplified; at the same time, the force condition of the corridor does not change after the construction is completed, which overcomes the technical problem that the force of the corridor changes after the support system such as scaffolding is removed by the traditional construction method, which may cause the entire structure to deform. , to ensure the quality of the project.

7. The construction is safer and more reliable.

Description of drawings

Figure 1 is a schematic diagram of the initial state structure.

Figure 2 is a schematic diagram of the installation of the first truss on the left side of the 11th floor.

Figure 3 is a schematic diagram of the installation of the second truss on the right side of the 11th floor.

Figure 4 is a schematic diagram of the installation of the main beam between the trusses on the 11th floor.

Figure 5 is a schematic diagram of the installation of the first steel column frame on the 10th, 9th, and 8th floors.

Figure 6 is a schematic diagram of the installation of the first side span longitudinal beams on the 10th, 9th and 8th floors.

Figure 7 is a schematic diagram of the installation of the second steel column frame on the 10th, 9th, and 8th floors.

Figure 8 is a schematic diagram of the installation of the longitudinal beams between the first spans on the 10th, 9th, and 8th floors.

Figure 9 is a schematic diagram of the installation of the third steel column frame on the 10th, 9th, and 8th floors.

Figure 10 is a schematic diagram of the installation of the longitudinal beams between the second spans on the 10th, 9th, and 8th floors.

Figure 11 is a schematic diagram of the installation of the fourth steel column frame on the 10th, 9th, and 8th floors.

Figure 12 is a schematic diagram of the installation of the longitudinal beams between the third spans on the 10th, 9th, and 8th floors.

Figure 13 is a schematic diagram of the installation of the second side span longitudinal beams on the 10th, 9th and 8th floors.

Figure 14 is a schematic diagram of the installation of the secondary beam (primary beam) between the trusses on the 11th floor.

Figure 15 is a schematic diagram of the installation of the 10-level beam (the second beam).

Figure 16 is a schematic diagram of the installation of the 9-level beam (the third beam).

Figure 17 is a schematic diagram of the installation of the 8-level beam (the fourth beam).

Figure 18 is a schematic diagram of the installation of truss upper chord braces and longitudinal beams.

Figure 19 is a schematic diagram of the installation of the cantilever on the right side of the 11-8th floor.

1 is the first truss, 2 is the second truss, 3 is the main beam, 4-1 is the first steel column frame, 4-2 is the second steel column frame, 4-3 is the third steel column Frame, 4-4 is the fourth piece of steel column frame, 5-1 is the first side beam, 5-2 is the second side beam, 6-1 is the first span beam, 6-2 is The second span longitudinal beam, 6-3 is the third span longitudinal beam, 7-1 is the first beam, 7-2 is the second beam, 7-3 is the third beam, 7-4 is the first beam Four beams, 8 is the upper chord brace and longitudinal beam, 9 is the cantilever beam on the right side, 10-1 is the left building body, and 10-2 is the right side building body.

detailed description

For a corridor installation project, the corridor has three floors, corresponding to the 10th, 9th, and 8th floors of the concrete building; the steel structure of the project is a suspended steel structure, and the corridor structure with functional functions from the 8th to the 10th floor passes through the 11th floor A system of steel trusses is suspended above the reinforced concrete structure. Therefore, the structure is dominated by 2 steel trusses, supplemented by 8-10 storey steel beams. Such stress characteristics require that the steel corridor should adopt a top-down construction sequence, that is, a "reverse construction method" construction sequence that is different from the conventional straight method.

The installation sequence is subdivided into 18 steps, which are:

Step 1: Installation of the first truss 1 (suspension) on the left side of the 11th floor (Figure 2);

Step 2: Installation of the second truss 2 (suspension) on the right side of the 11th floor (Figure 3);

Step 3: Installation of the main beam 3 (suspension) between the trusses on the 11th floor (Fig. 4);

Step 4: Installation of the first piece of steel column frame 4-1 (suspension) on floors 10, 9, and 8 (Figure 5);

Step 5: Installation of the first span side longitudinal beam 5-1 (suspension) on the 10th, 9th and 8th floors (Fig. 6);

Step 6: Installation of the second steel column frame 4-2 (suspension) on the 10th, 9th, and 8th floors (Figure 7);

Step 7: Installation of the longitudinal beam 6-1 (suspension) between the first spans of the 10th, 9th and 8th floors (Fig. 8);

Step 8: Installation of the third steel column frame 4-3 (suspension) on the 10th, 9th, and 8th floors (Figure 9);

Step 9: Installation of the longitudinal beam 6-2 (suspension) between the second spans on the 10th, 9th and 8th floors (Fig. 10);

Step 10: 4-4 (suspension) installation of the fourth steel column frame on the 10th, 9th, and 8th floors (Figure 11);

The eleventh step: installation of the longitudinal beam 6-3 (suspension) between the third spans on the 10th, 9th and 8th floors (Fig. 12);

The twelfth step: 5-2 (suspension) installation of the second side span longitudinal beam 5-2 (suspension) on the 10th, 9th and 8th floors (Fig. 13);

Step 13: Installation of the first beam 7-1 (suspension) between the trusses on the 11th floor (Figure 14);

Step 14: Installation of the second beam 7-2 (suspension) on the 10th floor (Figure 15);

Step 15: Installation of the third beam 7-3 (suspension) on the 9th floor (Figure 16);

Step 16: 7-4 (suspension) installation of the fourth beam on the 8th floor (Figure 17);

Step 17: Installation of truss upper chord bracing and longitudinal beam 8 (suspension) (Figure 18);

Step 18: Install the cantilever beam 9 (suspension) on the right side of floors 11-8 (Figure 19). As shown in the attached picture.

The method of the invention is safe and reliable in construction, and at the same time reduces the lower supporting system and reduces the cost.

Claims (2)

1. A high-altitude multi-storey hanging steel structure reverse method hoisting construction technology, a corridor is installed between the two reinforced concrete buildings on the left and right that have been built, the highest floor of the corridor corresponds to the nth floor of the building, and the connecting corridor The lowest floor of the corridor corresponds to the mth floor of the building, where m<n; it is characterized in that it includes the following steps: Step 1: hoist the first truss (1) on the inside of the n+1th floor of the left building (10-1); Step 2: hoist the second truss (2) on the inside of the n+1th floor of the right building (10-2); Step 3: hoist the main beam (3) between the installed pair of trusses; Step 4: Suspend and install the first piece of steel column frame (4-1) from n to m floors on the main beam (3); then hoist the n to m floor on the first piece of steel column frame (4-1) A side-span longitudinal beam (5-1); then hang and install the second steel column frame (4-2) behind the first steel column frame (4-1) on the main beam (3). The first inter-span longitudinal beam (6-1) is hoisted between one piece of steel column frame (4-1) and the second piece of steel column frame (4-2); The third piece of steel column frame (4-3) after the second piece of steel column frame (4-2), between the second piece of steel column frame (4-2) and the third piece of steel column frame (4-3) Lift the second inter-span longitudinal beam (6-2)...and so on until the last steel column frame and the last inter-span longitudinal beam are hoisted, and the n to m second span is hoisted on the last steel column frame Side longitudinal beams (5-2); both sides of all steel column frames are connected to the inner sides of the buildings on the left and right sides; all inter-span longitudinal beams and side span longitudinal beams are connected to adjacent buildings; Step 5: Hoist the first beam (7-1) between a pair of trusses on the n+1 floor; Step 6: hoist the second beam (7-2) between the inter-span longitudinal beams on the nth floor; then hoist the third beam (7-3) between the inter-span longitudinal beams on the n-1 floor ...until the hoisting of the secondary beams between the inter-span longitudinal beams of the mth floor is completed; Step 7: Hoist the upper chord braces and longitudinal beams of the truss (8); Step 8: Hoist the right cantilever beam (9) on floors n+1 to m. 2. The construction technology of reverse method hoisting of high-altitude multi-storey suspension steel structure as claimed in claim 1, characterized in that, n=10, m=8; there are four steel column frames in total.