Mounting method of suspended downward-hanging type steel structure

Abstract

The invention discloses a method for installing a suspended downward-hanging type steel structure. The method specifically comprises the following steps that firstly, a stiff column is installed; secondly, a transfer truss is installed; 3, positioning, paying off and supporting installation are carried out; fourthly, a lower-layer steel structure is installed; 5, correcting the structure; sixthly, a profiled steel sheet is installed, and a steel pipe column support is dismantled; the transfer truss is arranged on the upper layer of the multi-layer steel structure to share the load of the multi-layer steel structure, stability and safety of the whole structure are guaranteed, meanwhile, the lower layer steel structure is sequentially installed from bottom to top in the mode that lower supporting replaces lower hanging, after lower layer construction is completed, the lower layer steel structure can serve as a construction platform of the upper layer, construction operation is simplified, and construction efficiency is improved. And the construction efficiency is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a method for installing a suspended and hung steel structure. BACKGROUND

[0002] In recent years, with the rapid development of the construction industry in China, steel structures are being used more and more widely. Some buildings use a combination of reinforced concrete structures and steel structures to solve the problem of seismic over-limiting.

[0003] Generally, in a super high-rise building group, when two towers are connected by a corridor to form a whole structure, the traditional design usually uses a single or double corridor directly anchored to the tower core tube or outer frame column. However, when the number of corridor layers increases to 3 or more, the vertical and horizontal loads of the multi-layer corridor are concentrated through the connecting node to the tower, which easily leads to local stress over-limiting, and the stiffness difference between the corridor and the tower may cause structural resonance, especially under the action of an earthquake, the whipping effect of the multi-layer corridor will significantly amplify the displacement of the tower. SUMMARY

[0004] To solve the above problems, the present application provides a method for installing a suspended and hung steel structure, which sets a conversion truss on the upper layer of the steel structure to share the load of the multi-layer steel structure, ensuring the stability and safety of the whole structure, and at the same time, the lower layer of the steel structure uses a lower support instead of a hanging method, simplifying the construction operation and effectively improving the construction efficiency.

[0005] To achieve the above purpose, the present application adopts the following technical solution: a method for installing a suspended and hung steel structure, specifically comprising the following steps:

[0006] Step one, installation of stiff columns, install stiff columns layer by layer upwards along with the main body of the tower on both sides, and reserve the connecting points of the steel structure;

[0007] Step two, installation of conversion truss, the conversion truss is integrally assembled off-site, hoisted to the upper floor of the tower main body by hoisting equipment, and then welded and fixed at the connecting nodes of the stiff columns on the tower main body at both ends of the conversion truss;

[0008] Step three, positioning, line laying and support installation, lay out the projection plane of the steel structure layer by layer on the floor according to the position of the steel structure until the foundation floor, install 4 steel pipe column supports at the projection plane position, and connect the steel pipe column supports into a whole;

[0009] Step four, installation of lower layer steel structure, use hoisting equipment to hoist each layer of steel structure member from bottom to top to the corresponding installation position, and ensure that the center of the steel pipe column support coincides with the center of the steel structure member during installation, and the lower layer is used as the operation platform for the upper layer after installation;

[0010] Step five, structure correction, after installing a layer of steel structure, timely correction and fixation, adjustment of the verticality, flatness and axis deviation of the steel structure, after the completion of the installation of the steel structure, the verticality, flatness, axis deviation and the like of the whole structure are comprehensively measured and corrected;

[0011] Step six, installation of profiled steel sheet and removal of steel pipe column support, install the profiled steel sheet on each layer of steel structure, symmetrically remove the steel pipe column support one by one, do not remove at the same time, after the removal, pour concrete on the steel structure.

[0012] Preferably, in the step one, the stiff column is hoisted in sections, when the stiff column is hoisted to the installation position, the adjustable clamp structure is used to realize the temporary stabilization of the stiff column by screwing, and then welding and fixing.

[0013] Preferably, in the step three, the four steel pipe column supports are arranged at equal intervals.

[0014] Preferably, in the step four, the steel structure members can also be installed on the upper part of the conversion truss, and the upper steel structure members are hoisted to the corresponding installation position by the hoisting equipment in sequence, and the steel pipe column support is arranged on the conversion truss, and the center of the steel pipe column support is coincided with the center of the steel structure member on the upper part of the conversion truss.

[0015] Preferably, in the step five, when the correction is performed after the installation of each layer of steel structure, the verticality of the steel structure is measured by using a laser plummet, the precision of the laser plummet is not less than 1 / 40000, and for the parts with verticality deviation exceeding the allowable value, the jacks are used for jacking or pulling down correction.

[0016] Preferably, in the step six, during the removal of the steel pipe column support, the warning line is arranged around the steel structure, and a special person is arranged for monitoring, when the concrete is poured on each layer of steel structure, the pumping concrete is used, the slump of the concrete is controlled to be between 160mm-200mm, and the vibrating bar is used for vibrating during the pouring process, and the insertion interval of the vibrating bar is not greater than 500mm.

[0017] Compared with the prior art, the beneficial effects of the present application are: the present application sets the conversion truss on the upper layer of the multi-layer steel structure to share the load of the multi-layer steel structure, ensures the stability and safety of the whole structure, and the lower layer steel structure is installed in sequence from bottom to top by using the lower support instead of the lower hanging mode, after the completion of the lower layer construction, the construction platform of the previous layer is provided, the construction operation is simplified, and the construction efficiency is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in combination with the drawings: Fig. 1 It is a flowchart of the construction method of the present application. Fig. 2 This is a schematic diagram of the installation of the construction structure of the present invention; Fig. 3 This is a schematic diagram simulating the support of steel pipe columns; In the diagram: 1. Main structure of the tower; 2. Stiffened column; 3. Steel pipe column support; 4. Steel structure; 5. Transfer truss. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] The technical solution of the present invention will be described in detail below with reference to specific embodiments. The following specific embodiments may be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0026] Example 1

[0027] like Figs. 1 to 3 As shown, the present invention provides a method for installing a suspended steel structure, which specifically includes the following steps: Step 1: Install the stiffening column 2. Install the stiffening column 2 layer by layer upwards along with the main civil engineering structure 1 of the two towers, and reserve the connection points of the steel structure 4. During installation, determine the length of the stiffening column 2 according to the floor height, mark the hoisting sequence number, and fix it by welding to the embedded parts on the main civil engineering structure 1. Step 2: Installation of the conversion truss 5. The conversion truss 5 is assembled off-site and then hoisted to the upper floor of the main building 1 using hoisting equipment. The two ends of the conversion truss 5 are then welded and fixed to the connection nodes of the stiffening columns 2 on the main building 1 of the tower. Step 3: Based on the location of steel structure 4, project the projection surface of steel structure 4 layer by layer on the floor slab until the foundation ground. Install 4 steel pipe column supports 3 at the projection surface location and connect the steel pipe column supports 3 into a whole. The 4 steel pipe column supports 3 are arranged perpendicular to the installation direction of steel structure 4. In this way, steel structure 4 can be supported by the main civil engineering structures 1 of the two towers on both sides in the installation direction, and supported by the 4 steel pipe column supports 3 perpendicular to the installation direction, ensuring the stability of the steel structure. Connecting the steel pipe column supports 3 into a whole can improve the support stability of the steel pipe column supports 3. Step four, the lower steel structure 4 is installed, each layer of steel structure 4 component of the lower part of the conversion truss 5 is hoisted from bottom to top to the corresponding installation position by hoisting equipment, when installation, the center of the steel pipe column support 3 needs to be coincided with the center of the steel structure 4 component, after the lower layer is installed, it is used as the operation platform of the upper layer, and the construction is more safe and reliable; Step five, structure correction, after each layer of steel structure 4 is installed, correction and fixation are timely carried out, the perpendicularity, flatness and axis deviation of the steel structure 4 are adjusted, and after the steel structure 4 is completely installed, the perpendicularity, flatness, axis deviation and the like of the whole structure are comprehensively measured and corrected; Step six, profiled steel plate installation and steel pipe column support 3 removal, the profiled steel plate is installed on each layer of steel structure 4, in order to ensure that the concrete slab surface is not deflected, the floor support needs to be additionally arranged for the floor slab with a short side span greater than 2m of the profiled steel plate, the steel pipe column support 3 needs to be symmetrically removed one by one, and cannot be simultaneously removed, otherwise, local stress concentration or overall stiffness mutation is easily caused, and structure deformation or even collapse is caused, after the removal is completed, the concrete is poured, and the floor support is removed after the pouring is completed.

[0034] Further, in the step one, the stiff column 2 is hoisted in sections, when the stiff column 2 is hoisted to the installation position, the temporary stabilization of the stiff column 2 is realized by screwing the adjustable hoop structure through bolts, and then welding and fixing are carried out. The stiff column 2 is prepositioned through the temporary stabilization device, and the position thereof is also adjusted when welding and positioning subsequently.

[0035] Further, in the step three, the four steel pipe column supports 3 are arranged at equal intervals, and the equal interval arrangement ensures uniform stress.

[0036] Further, in the step four, the steel structure 4 component can also be installed on the upper part of the conversion truss 5, and the steel structure 4 component on the upper part is sequentially hoisted to the corresponding installation position by the hoisting equipment, and the steel pipe column support 3 is arranged on the conversion truss 5, and the center of the steel pipe column support 3 is coincided with the center of the steel structure 4 component on the upper part of the conversion truss 5. The steel structure 4 is continuously installed on the upper layer of the conversion truss 5, the space is fully used within the load bearing range, and the space utilization rate is maximized.

[0037] Further, in step five, after the installation of each layer of steel structure 4, the verticality of the steel structure 4 is measured by using a laser plummet, and the accuracy of the laser plummet is not less than 1 / 40000. For the parts with verticality deviation exceeding the allowable value, jacks are used for jacking or pulling down correction. The jacking correction is specifically as follows: hydraulic jacks are symmetrically arranged on both sides of the column foot, and the jacks are synchronously jacked, and the jacking amount is less than or equal to 2mm each time. The verticality change is monitored in real time by using the laser plummet. After the jacking to the deviation of less than or equal to 5mm, a limiting steel plate is welded between the column foot and the foundation to prevent rebound. The pulling down correction is specifically as follows: a hand-operated hoist or a through-type jack is arranged at the top of the column, and is connected to the lower structure through a steel strand. The jack is loaded in stages, and after each stage of loading, the jack is stabilized for 10 minutes before measurement. After the pulling down to the deviation of less than or equal to 5mm, a temporary tie plate is welded at the top of the column and is connected and fixed with the surrounding structure.

[0038] Further, in step six, during the removal of the steel pipe column support 3, a warning line is arranged around the steel structure 4, and a special person is arranged for monitoring. When each layer of steel structure is poured with concrete, the concrete is pumped, and the slump of the concrete is controlled to be between 160mm and 200mm. During the pouring process, an insert type vibrating rod is used for vibration. The insertion interval of the vibrating rod is not greater than 500mm.

[0039] In summary, by arranging the conversion truss 5 on the upper layer of the multi-layer steel structure 4 to share the load of the multi-layer steel structure 4, the stability and safety of the overall structure are ensured. At the same time, the lower layer steel structure 4 is installed in a top-down sequence by using a lower support instead of a lower hanging method. After the completion of the lower layer construction, it can be used as a construction platform for the upper layer, which simplifies the construction operation and effectively improves the construction efficiency.

[0040] In addition to the preferred embodiments described above, the present application has other embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

Claims

1. A method for installing a suspended steel structure, characterized in that, Specifically comprising the following steps: Step one, the installation of the stiff column, the stiff column is installed layer by layer upwards along with the main body of the tower building, and the connecting points of the steel structure are reserved; Step two, the installation of the conversion truss, the conversion truss is integrally assembled off-site, hoisted to the upper floor of the tower building by hoisting equipment, and then welded and fixed at the connecting nodes of the stiff columns on the tower building; Step three, positioning, line laying and support installation, the projection plane of the steel structure is laid layer by layer on the floor until the ground, and four steel pipe column supports are installed at the projection plane position and connected into a whole; Step four, the installation of the lower layer steel structure, each layer of steel structure member of the lower part of the conversion truss is hoisted to the corresponding installation position from bottom to top by hoisting equipment, and the center of the steel pipe column support should coincide with the center of the steel structure member during installation, and the lower layer is used as the operation platform for the upper layer after installation; Step five, structure correction, after the installation of each layer of steel structure, correction and fixation are carried out in time, the perpendicularity, flatness and axis deviation of the steel structure are adjusted, and after the complete installation of the steel structure, the perpendicularity, flatness and axis deviation of the whole structure are measured and corrected comprehensively; Step six, the installation of the profiled steel plate and the removal of the steel pipe column support, the profiled steel plate is installed on each layer of steel structure, and the steel pipe column support is removed symmetrically and layer by layer, and the steel structure is poured with concrete after the removal.

2. The method of claim 1, wherein, In step one, the stiff column is hoisted in sections, and when the stiff column is hoisted to the installation position, the adjustable clamp structure is used to temporarily stabilize the stiff column by screwing, and then welded and fixed.

3. The method of claim 1, wherein the method further comprises: In step three, the four steel pipe column supports are arranged at equal intervals.

4. The method of claim 1, wherein, In step four, the steel structure member can also be installed on the upper part of the conversion truss, and the upper steel structure member is hoisted to the corresponding installation position by hoisting equipment, and the steel pipe column support is arranged on the conversion truss to ensure that the center of the steel pipe column support coincides with the center of the steel structure member on the upper part of the conversion truss.

5. The method of claim 1, wherein, In step five, when the correction is carried out after the installation of each layer of steel structure, the perpendicularity of the steel structure is measured by using a laser plummet, and the precision of the laser plummet is not less than 1 / 40000, and for the parts with perpendicularity deviation exceeding the allowable value, the jack is used for jacking or pulling down correction.

6. The method of claim 1, wherein, In step six, during the removal of the steel pipe column support, a warning line is set up around the steel structure, and a special person is arranged for monitoring, and when the concrete is poured for each layer of steel structure, the pumping method is used, the slump of the concrete is controlled between 160mm-200mm, and the plug-in vibrator is used for vibration during pouring, and the insertion interval of the vibrator is not more than 500mm.

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