Concrete pouring method for suspension structure construction

Abstract

The invention provides a concrete pouring method for suspension structure construction, in the concrete structure construction, the concept of first hinging and then consolidation is followed, that is, a hinging state is adopted before basic load is applied to release stress in the construction process, and after large-area load is loaded and strain tends to be stable, consolidation treatment is performed on related nodes. The concept of first hinging and then consolidation is achieved mainly by arranging a post-cast strip on a floor and arranging a construction joint at a support node for two times of pouring, sealing after large-area load is applied, and finally integrally pouring roof concrete at one time. The construction quality problem that concrete structures at the joints of the floors and the core tube and the truss support joints are prone to cracking can be reduced to the maximum extent, the cracking risk caused by too large roof structure stress is effectively avoided, and the hidden danger of roof water leakage is reduced.

Description

Technical Field

[0001] The invention relates to a concrete pouring method used in the construction of a suspension structure. Background Art

[0002] In recent years, the suspension structure has become a trend in the development of high-rise and super-high-rise buildings because of its advantages of less steel consumption, increased effective use area, good earthquake resistance, reduced number of foundations, and uneven settlement of foundations. Its structure is mainly composed of core tube, cantilever truss or diagonal rods, hangers and floor slabs of each floor. The core tube is usually made of reinforced concrete structure, but it can also be made of steel structure. The inner end of each floor slab is supported on the core tube, and the outer end is a hanger suspension column. The hanger is suspended on the cantilever truss extending from the core tube, and can also be suspended on the top of the core tube with a diagonal rod. The load of the suspension structure is transmitted upward from the hanger to the truss or diagonal rod, and then transmitted downward from the core tube to the foundation.

[0003] According to the relevant model analysis, the vertical deformation of the suspended floor edge slab is significantly different from that of the core tube, such as more than 59.8mm, and large tensile stress may appear in the slab. Under the action of vertical load, the suspended floor slab is tensile, and the tensile stress is large near the cantilever truss and the core tube.

[0004] After the installation of the suspended steel structure is completed, the floor slab concrete is poured according to the conventional structural system steel structure engineering, that is, the floor slab concrete pouring process is mainly poured layer by layer as the steel structure truss floor decking of each layer is laid. According to the above-mentioned floor slab efficiency research and analysis of the suspended structure, the tensile stress near the cantilever truss and the core tube is relatively large, and the tensile stress will be superimposed as the number of floor slab pouring layers increases. When the floor slab deformation exceeds the stress limit threshold, the floor slab at the core tube end will crack or even crack and break. Summary of the invention

[0005] The purpose of the invention is to provide a concrete pouring method for use in the construction of a suspended structure.

[0006] In order to solve the above problems, the present invention provides a concrete pouring method for use in the construction of a suspended structure, comprising:

[0007] Step S1, during the core tube construction stage, a horizontal construction joint is set between the support of the truss at the top of the core tube and the core tube, and the support of the truss is first hinged to the core tube;

[0008] Step S2, after the hanging steel structure outer frame is hung on the truss, the truss floor slab is laid and the steel bars are tied. After completion, the concrete of each floor slab is poured from bottom to top;

[0009] Step S3, performing structural loading on each poured floor;

[0010] Step S4, pouring concrete of the post-cast zone from bottom to top;

[0011] Step S5, pouring the roof structure concrete under the truss as a whole, and closing the construction joint between the top of the core tube and the truss support to consolidate the roof truss support node.

[0012] Furthermore, in the above method, the suspended structure has 20 floors above ground, and the floors above 5 are suspended structures, with up to 16 floors suspended at one time.

[0013] Furthermore, in the above method, step S1 includes:

[0014] The concrete of the floors with suspended steel structure frames from floors 5 to 19 is poured from bottom to top.

[0015] Furthermore, in the above method, step S1 includes:

[0016] Set the bottom chord of the truss to 200mm from the top of the core.

[0017] Furthermore, in the above method, step S2 includes:

[0018] The pouring of each floor slab is controlled from the hanging outer end of the suspended steel structure frame toward the core tube.

[0019] Furthermore, in the above method, step S2 includes:

[0020] When pouring each floor slab, a stress relief post-cast joint is set on the side of the core tube.

[0021] Furthermore, in the above method, step S3 includes:

[0022] The load of the second structure is applied on the 5th to 19th floors.

[0023] Furthermore, in the above method, the loading of the two structures at least includes: applying the load of the two structure masonry works, the external curtain wall works and the main equipment pipeline works to each floor

[0024] Furthermore, in the above method, step S4 includes:

[0025] The stress relief post-cast strip is closed.

[0026] Furthermore, in the above method, closing the stress release post-casting strip comprises:

[0027] In the stress release post-casting zone of the 5th to 19th floors, pouring and sealing is carried out from bottom to top.

[0028] Compared with the prior art, the present invention provides a concrete pouring method for a suspended structure. In the construction of the concrete structure, the concept of articulation before consolidation is followed, that is, the hinged state is adopted before the basic load is applied to release the stress in the construction process. After the large-surface load is loaded and the strain tends to be stable, the relevant nodes are consolidated. The concept of articulation before consolidation is realized mainly by setting post-cast strips on the floors, setting construction joints at the support nodes for two pourings, sealing them after the large-surface load is applied, and finally pouring the roof concrete as a whole at one time. The present invention can greatly reduce the construction quality problems such as cracks that are very easy to occur in the concrete structure at the connection between the floor and the core tube and at the truss support nodes, effectively avoid the risk of cracking caused by excessive stress in the roof structure, and reduce the hidden dangers of water leakage in the roof.

[0029] The present invention can solve the problem of excessive stress in the one-time pouring of concrete layers of suspended structure floors, which not only avoids the occurrence of cracks in the floor structure due to the inability to release stress due to increased loads during the construction process, including the destruction of concrete at the lower chord support of the roof truss due to excessive stress, but also greatly improves the quality of concrete construction in the construction of suspended structures. In particular, the roof structure floor is first hinged to release stress and then poured and consolidated as a whole, avoiding the risk of leakage caused by setting a stress post-casting strip on the roof. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a schematic diagram of a concrete pouring method for suspended structure construction according to an embodiment of the present invention;

[0031] Figure 2 Schematic diagram of a post-cast strip according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, the present invention provides a concrete pouring method for suspended structure construction, comprising:

[0034] Step S1, such as Figure 1 and 2 As shown, during the core tube construction stage, a horizontal construction joint is set between the support of the truss 3 at the top of the core tube 2 and the core tube, and the support of the truss is hinged to the core tube first;

[0035] Here, the lower rotation of the truss is the roof, and the construction joints described later are cast together with the roof;

[0036] The steel truss outer frame suspended structure building of a core tube can have 20 floors above ground, and the floors above 5 are suspended structures, with up to 16 floors suspended at a time.

[0037] Preferably, the lower chord of the truss is about 200 mm from the top of the core tube;

[0038] Here, if Figure 1 As shown, a construction joint can be installed when the concrete on the top of the core tube is poured to 200mm from the lower chord truss;

[0039] Here, if Figure 1 As shown, the concrete of the floors with suspended steel structure frames from the 5th to the 19th floors can be poured from bottom to top, and a post-casting strip can be set at the core tube;

[0040] Preferably, the pouring of each floor slab is controlled to proceed from the hanging outer end of the hanging steel structure outer frame toward the core tube;

[0041] Better, such as Figure 2 As shown, when pouring each floor slab, a stress relief post-cast strip 1 is provided on the side of the core tube 2;

[0042] Step S3, performing secondary structure loading on each poured floor;

[0043] Here, if Figure 1 As shown, the load application of the second structure can be carried out on the 5th to 19th floors;

[0044] The loading of the second structure at least includes: applying the load of the second structure masonry engineering, the external curtain wall engineering and the main equipment pipeline engineering to each floor;

[0045] Step S4, pouring concrete in the post-cast strips from bottom to top in sequence to seal the stress release post-cast strips 1;

[0046] Here, if Figure 1 As shown, the stress release post-casting strips of the 5-19th floor can be cast from bottom to top to seal;

[0047] Step S5, pouring the roof structure concrete under the truss as a whole, and closing the construction joint between the top of the core tube and the truss support to consolidate the roof truss support node.

[0048] Here, if Figure 1 As shown, the roof structure concrete can be poured in one piece from the cantilever end to the core tube side.

[0049] In the construction of conventional structural systems, the top layer of the core tube is poured to the top at one time, and the steel structure rods are wrapped and sealed according to the design requirements. In the construction of suspended structures, according to the axial force diagram of the roof cantilever truss, the compressive stress on the cantilever end side at the truss lower chord support is large, and increases with the load of the outer frame structure. If the concrete is poured to the top at one time, the concrete at the cantilever truss support will be damaged due to excessive compressive stress.

[0050] Suspended structure buildings have extremely high construction control requirements in all aspects due to their special stress form and construction process. If the structural concrete is poured according to the conventional process, as the construction progresses, the load gradually increases, and the concrete structure at the connection between the relevant floors and the core tube and the truss support nodes is prone to cracks and other construction quality problems, increasing the risk of roof leakage, and in serious cases affecting the use function.

[0051] How to avoid excessive stress on the concrete floor slabs and related nodes of the suspended structure and ensure that the stress on the concrete structure remains within a safe and controllable range is a difficult problem that needs to be solved in the current construction of suspended structures. Take Tower A, a research and development project with a large number of suspended floors in China, as an example. The building adopts a full-floor suspended structure with 16 floors suspended at a time. During the construction process, the load on the structure accumulates, and the deformation of each floor increases accordingly. The difficulty of controlling force and shape in structural construction is more prominent.

[0052] The present invention provides a concrete pouring method for a suspended structure. In the construction of the concrete structure, the concept of hinge first and then consolidation is followed, that is, a hinged state is adopted before the basic load is applied to release the stress in the construction process. After the large-surface load is loaded and the strain tends to be stable, the relevant nodes are consolidated. The concept of hinge first and then consolidation is realized mainly by setting post-cast strips on the floors, setting construction joints at the support nodes for two pourings, sealing after the large-surface load is applied, and finally pouring the roof concrete as a whole at one time. The present invention can greatly reduce the construction quality problems such as cracks that are very easy to occur in the concrete structure at the connection between the floor and the core tube and at the truss support nodes, effectively avoid the risk of cracking caused by excessive stress in the roof structure, and reduce the hidden dangers of water leakage in the roof.

[0053] The present invention can solve the problem of excessive stress in the one-time pouring of concrete layers of suspended structure floors, which not only avoids the occurrence of cracks in the floor structure due to the inability to release stress due to increased loads during the construction process, including the destruction of concrete at the lower chord support of the roof truss due to excessive stress, but also greatly improves the quality of concrete construction in the construction of suspended structures. In particular, the roof structure floor is first hinged to release stress and then poured and consolidated as a whole, avoiding the risk of leakage caused by setting a stress post-casting strip on the roof.

[0054] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0055] Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the invention. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A method for pouring concrete in the construction of a suspended structure, characterized in that: include: Step S1, during the core tube construction stage, a horizontal construction joint is set between the support of the truss at the top of the core tube and the core tube, and the support of the truss is first hinged to the core tube; Step S2, after the hanging steel structure outer frame is hung on the truss, the truss floor slab is laid and the steel bars are tied. After completion, the concrete of each floor slab is poured from bottom to top; Step S3, performing structural loading on each poured floor; Step S4, pouring concrete of the post-cast zone from bottom to top; Step S5, pouring the roof structure concrete under the truss as a whole, and closing the construction joint between the top of the core tube and the truss support to consolidate the roof truss support node.

2. The concrete pouring method for suspended structure construction according to claim 1, characterized in that: The suspended structure has 20 floors above ground, and the floors above the 5th floor are suspended structures, with up to 16 floors suspended at one time.

3. The concrete pouring method for suspended structure construction according to claim 1, characterized in that: Step S1 includes: The concrete of the floors with suspended steel structure frames from floors 5 to 19 is poured from bottom to top.

4. The concrete pouring method for suspended structure construction according to claim 1, characterized in that: Step S1 includes: Set the bottom chord of the truss to 200mm from the top of the core.

5. The concrete pouring method for suspended structure construction according to claim 3, characterized in that: Step S2 comprises: The pouring of each floor slab is controlled from the hanging outer end of the suspended steel structure frame toward the core tube.

6. The concrete pouring method for suspended structure construction according to claim 5, characterized in that: Step S2 comprises: When pouring each floor slab, a stress relief post-cast joint is set on the side of the core tube.

7. The concrete pouring method for suspended structure construction according to claim 4, characterized in that: Step S3 includes: The load of the second structure is applied on the 5th to 19th floors.

8. The concrete pouring method for suspended structure construction according to claim 7, characterized in that: The loading of the two structures at least includes: applying the loads of the two structure masonry works, the exterior curtain wall works and the main equipment pipeline works to each floor.

9. The concrete pouring method for suspended structure construction according to claim 7, characterized in that: Step S4 comprises: The stress relief post-cast strip is closed.

10. The concrete pouring method for suspended structure construction according to claim 9, characterized in that: Closing the stress release post-casting strip includes: In the stress release post-casting zone of the 5th to 19th floors, pouring and sealing is carried out from bottom to top.

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