CN116856550A - A reverse construction method for new construction above ground with reinforced concrete frame structure steel slideway jacking - Google Patents

Abstract

The invention discloses a newly-built reverse construction method for lifting a steel slideway of a reinforced concrete frame structure. When the reinforced concrete frame structure is newly built, all frame columns are prefabricated in a segmented mode, the installed prefabricated columns are synchronously lengthened and synchronously jacked, the floor part is built at the bottom, and the reverse construction on the ground is achieved. In the lengthening process, steel plates at the bottom and the top of the adjacent prefabricated columns are welded, annular gaps of reserved grooves of the tops of the columns are grouted, and structural butt joint is achieved. The construction method can realize that all floor structures of the building are constructed within the height range of 2 meters at the bottom, can avoid construction protection such as scaffolds, climbing forms and the like, can avoid overhead operation, reduces capital and resource occupation time, and can be popularized and applied according to the novel construction method.

Description

A reverse construction method for new construction above ground with reinforced concrete frame structure steel slideway jacking

Technical field

The invention relates to the field of construction technology, and in particular to a reverse construction method for a steel slideway jacking above ground for a reinforced concrete frame structure.

Background technique

The construction industry is a pillar industry of the national economy and provides strong support for the sustained and healthy development of our country's economy. However, the production methods of the construction industry are still relatively extensive, and there is still a big gap compared with the requirements for high-quality development. In order to promote the industrialization, digitalization and intelligent upgrading of construction, accelerate the transformation of construction methods, and promote the high-quality development of the construction industry, the Ministry of Housing and Urban-Rural Development and 12 ministries and commissions jointly issued the "Guiding Opinions on Promoting the Coordinated Development of Intelligent Construction and Construction Industrialization" and other national documents, providing The great revolution of intelligent construction in the construction industry has begun. The traditional building construction mode is a single-story construction from bottom to top, which requires the use of climbing formwork, scaffolding and other construction protection and takes a long time. Therefore, a construction method of building underground and jacking up is developed, eliminating the need for climbing frames. and the erection of scaffolding, this new above-ground reverse construction method has broad application prospects.

Contents of the invention

The purpose of this invention is to provide a method for constructing a single-layer reinforced concrete frame structure about two meters above the ground in view of the long construction period, high construction surface, and the need to use climbing frames or scaffolding. The floor beam-slab structure is poured everywhere, which is an efficient construction method that eliminates the need to set up scaffolding or use climbing frames.

In order to achieve the above object, the technical solution of the present invention is: a new reverse construction method for steel slide jacking on the ground with reinforced concrete frame structure, which is characterized by including the following steps:

Step 1: First, split the concrete frame columns of each layer into three sections of precast concrete columns, which are divided into the first section of precast columns, the middle section of precast columns and the lower section of precast columns, and precast in advance according to the relevant node structure;

Step 2: Pour the foundation of the reinforced concrete column and embed the steel slide pad and embedded parts;

Step 3: Install the steel slides and steel corbels, and then install the first prefabricated column (2 meters) on the top floor in place (see Figure 1);

Step 4: Install the top beams and slab formwork at a low height from the ground, tie the steel cage on site, pour concrete, and maintain the concrete to the specified strength value so that the top beams and the first column of the top floor are connected to form a whole, and the top slab and the first column of the top floor are connected as a whole. The knotted columns are detached to allow steel slides to pass through the top floor;

Step 5: Jack up the whole structure formed by the top layer and the installed first section of the precast columns on the top layer. After the jacking reaches a certain height, install the top middle section of precast columns in the steel slide, and at the same time pour the columns of the next structural layer on the top layer. Concrete (see Figure 2);

Step 6: After the prefabricated columns in the middle section of the top layer and the precast columns in the first section of the top layer are integrated, continue to lift upward. After reaching a certain height, install the prefabricated columns in the lower section of the top layer (see Figure 3);

Step 7: After forming a whole, the top floor is completed, continue to lift, and pour the floor structure of the next floor on the top floor, and at the same time install the first section of prefabricated columns on the next floor on the top floor (see Figure 4);

Step 8: Repeat multiple cycles to achieve 2 floors below the top, 3 floors below, 4 floors below... until the 2 floors are poured;

Step 9: After the pouring of all floors is completed and the design elevation is reached, the lower section columns of the bottom floor are installed, welded to the embedded bottom plate in the foundation, and covered with 500-meter-high concrete column feet;

Step 10: Remove the steel slide and pour the concrete between the floor slab and the prefabricated columns.

In step three, the steel corbels can be temporarily fixed on the steel slide. After the prefabricated columns are installed, the steel corbels are reliably connected to the prefabricated columns. When the jack lifts the steel corbels, the prefabricated columns can be driven to slide upward.

Before the implementation of step four, the collision problem between the longitudinal bars of each frame beam, the longitudinal bars of the prefabricated columns, and the steel slides must be fully considered.

In the steps five, six and seven, it is necessary to consider the connection between the middle section of the precast column, the first section of the precast column and the lower section of the precast column. This can be done by welding the upper and lower embedded steel plates of the precast column, the cup mouth of each precast column, and the convex part of each precast column. The outgoing column feet are grouted to form a whole.

The invention involves a reinforced concrete frame structure steel slideway jacking above ground new construction reverse construction method, which has the following beneficial effects:

The invention discloses a reverse construction method for a reinforced concrete frame structure that is lifted up by steel slides to build a new building on the ground. Part of the already built reinforced concrete frame structure is lifted upward through the steel slides, which can realize construction at low places on the ground and eliminate the need for scaffolding erection. Or the use of climbing frames to achieve reverse construction of new buildings on the ground. This construction method can eliminate the need for scaffolding or climbing frames, reduce high-altitude operations, and reduce the time occupied by funds and resources. It is in line with the development trend of intelligent construction and can be widely promoted and applied.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings needed to describe the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the state after pouring the top beam plate disclosed in the present invention;

Figure 2 is a schematic diagram of the prefabricated column in the top middle section disclosed by the present invention after installation;

Figure 3 is a schematic diagram of the prefabricated column in the lower section of the top layer disclosed in the present invention after installation;

Figure 4 is a schematic diagram of the state after the top layer and the next layer are poured according to the invention;

Figure 5 is a schematic diagram of the state of the building disclosed in the present invention after completion of construction;

Figure 6 is a large diagram of the bottom structure of the prefabricated column disclosed by the present invention (looking down);

Figure 7 is a large-scale view (top view) of the top structure of the prefabricated column disclosed in the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

In order to express the purpose, technical solutions and advantages of the present invention more clearly, the present invention will be further introduced below in conjunction with the accompanying drawings.

Step 1: First determine the top floor beams 7 and slabs 8 that need to be poured first according to the structural construction drawings, and split all concrete frame columns into three sections of precast concrete columns, divided into the first section of precast columns (6 and 16), the middle section Precast column 12 and lower precast column 14. Among them, the first section of precast columns (6 and 16, considered at about 2 meters) needs to consider the connection between frame beams (7 and 17) and columns (6 and 16), and avoid steel bar collisions. (See Figures 1 to 4);

Step 2: Pour the foundation 1 of the reinforced concrete column, and embed the embedded parts 2 and the steel slide pad 3 (see Figure 1);

Step 3: Install the steel slides 4 and steel corbels 5, and then install the first prefabricated column 6 of the 4th floor in place (see Figure 1);

Step 4: Install the top beam 7 and plate 8 formwork at a low height from the ground and tie the steel cage on site. Concrete is poured and the concrete is cured to the specified strength value so that the top beam 7 and the top first column 6 are connected to form a whole. The plate 8 is detached from the first column on the top floor to facilitate the steel slide to pass through the top floor (see Figure 1);

Step 5: After the jack 9 is in place, jack up the whole body formed by the installed plate 8, beam 7 and column 6 on the top floor. After the jack 9 reaches a certain height, move the prefabricated column 12 in the middle section of the top floor to the steel slide 4 , drop the lower convex column head 10 of the first section of the precast column 6 on the top floor into the upper groove 11 of the middle section of the precast column 12, and connect the lower embedded steel plate 19 of the first section of the precast column 6 with the upper precast column of the middle section of the precast column 12. The embedded steel plate 20 is welded, and the lower embedded grouting pipe 21 of the groove 11 is grouted. After the upper grouting pipe 22 is grouted, both the grouting port and the grouting port are blocked (see Figure 2).

Step 6: After the strength of the grouting materials reaches the lifting requirements, continue to lift upward. After the lifting reaches a certain height, move the precast column 14 of the lower section of the top layer to the steel slide 4, and move the precast column 12 of the middle section of the top layer. The lower convex column head 13 falls into the upper groove of the lower prefabricated column 14, and the lower prefabricated steel plate 19 of the middle prefabricated column 12 and the upper prefabricated steel plate 20 of the lower prefabricated column 14 are welded, and the lower prefabricated column 14 is welded. The lower pre-embedded grouting pipe 21 of the upper groove 11 of the column 14 is grouted. After the upper grouting pipe 22 is grouted, both the grouting port and the grouting port are blocked (see Figure 3).

Step 7: Continue jacking. After the jacking reaches a certain height, move the first section of the prefabricated column 16 of the next layer on the top layer to the steel slide 4, and drop the lower convex column head 15 of the lower section of the prefabricated column 14 of the next layer on the top layer. into the upper groove of the upper section of the precast column 16 on the next layer of the top layer, and weld the lower embedded steel plate 19 of the lower section of the precast column 14 with the upper embedded steel plate 20 of the first section of the precast column 16 of the next layer on the top layer, and The lower pre-embedded grouting pipe 21 of the tank 11 is grouted. After the upper grouting pipe 22 is grouted, both the grouting port and the grouting port are blocked. At the same time, the beams 17 and slabs 18 of the lower layer of the top layer are poured (see figure). 4).

Step 8: Repeat multiple cycles to achieve 2 floors below the top, 3 floors below, 4 floors below... until the 2 floors are poured;

Step 9: After the pouring of all floors is completed and reaches the design elevation, install the lower section columns of the bottom floor, weld the lower embedded steel plate of the lower section columns of the bottom floor to the prefabricated bottom plate in the foundation, and wrap 500-meter-high concrete column feet;

Step 10: Remove the steel slide and pour the concrete between the floor slab and the prefabricated columns.

Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still The technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalently substituted. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in this document. within the scope of protection of the invention.

Claims (5)

1. A reverse construction method for a reinforced concrete frame structure steel slide jacking above ground, characterized in that the method includes the following steps: Step 1: First, split the concrete frame columns of each layer into three sections of precast concrete columns, which are divided into the first section of precast columns, the middle section of precast columns and the lower section of precast columns, and precast in advance according to the relevant node structure; Step 2: Pour the foundation of the reinforced concrete column and embed the steel slide pad and embedded parts; Step 3: Install the steel slides and steel corbels, and then install the first prefabricated column (2 meters) on the top floor in place; Step 4: Install the top beams and slab formwork at a low height from the ground, tie the steel cage on site, pour concrete, and maintain the concrete to the specified strength value so that the top beams and the first column of the top floor are connected to form a whole, and the top slab and the first column of the top floor are connected as a whole. The knotted columns are detached to allow steel slides to pass through the top floor; Step 5: Jack up the whole structure formed by the top beam plate and the installed top first section precast column. After the jacking reaches a certain height, install the top middle section prefabricated column in the steel slideway; Step 6: After the prefabricated columns in the middle section of the top layer and the precast columns in the first section of the top layer are integrated, continue to lift upward. After reaching a certain height, install the prefabricated columns in the lower section of the top layer; Step 7: After forming a whole, continue to jack up and pour the structure of the next floor on the top floor, and at the same time, the first section of the prefabricated column on the next floor on the top floor; Step 8: Repeat multiple cycles to achieve 2 floors below the top, 3 floors below, 4 floors below... until the 2 floors are poured; Step 9: After the pouring of all floors is completed and the design elevation is reached, the lower section columns of the bottom floor are installed, welded to the prefabricated bottom plate in the foundation, and covered with 500-meter-high concrete column feet; Step 10: Remove the steel slide and pour the concrete between the floor slab and the prefabricated columns. 2. A reverse construction method for a reinforced concrete frame structure with steel slides jacking up above ground as claimed in claim 1, characterized in that: through the lengthening of the prefabricated columns and the lifting of the steel slides, the building floors can be placed on the ground Construction within a 2-meter-high range enables reverse construction of new buildings on the ground, and eliminates the need for scaffolding or climbing frame construction protection, and eliminates the need for high-altitude operations. 3. A reverse construction method for a reinforced concrete frame structure steel slide jacking above ground as claimed in claim 1, characterized in that: there is less wet work to connect the prefabricated columns, the bottom and top of the prefabricated columns are embedded with steel plates, and the steel plates Welding with the longitudinal bars in the precast columns and welding the bottom and top steel plates of the adjacent precast columns can be considered to have reliably connected the longitudinal bars in the adjacent precast columns, and it will not affect the smooth progress of the construction when grouting is not performed or the grouting is not dense. 4. A reverse construction method for a reinforced concrete frame structure steel slide jacking above ground as claimed in claim 1, characterized in that: the gaps between the prefabricated columns are small and are annular connected spaces, and the gaps are grouted through reserved bellows. , easy to operate, small grouting volume, and whether the grouting is full can be judged through the grouting outlet. 5. A reverse construction method for a reinforced concrete frame structure steel slide jacking above ground as claimed in claim 1, characterized in that: the prefabricated column embedded steel plate under the bottom floor is welded to the embedded bottom plate in the foundation, and the precast steel plate is welded to the bottom floor. The 500-meter-high outer column base concrete is poured to form a reliable integration between the prefabricated columns and the foundation.