Synchronous construction method for removing structure and replacing frame in existing brick-concrete building

Abstract

The invention relates to the field of building construction, in particular to a synchronous construction method for dismantling a structure and replacing a frame in an existing brick-concrete building. Construction is conducted layer by layer from bottom to top, after construction of replacement frame beams and columns of which the elevation is the same as that of an original structure is completed on each layer, original non-bearing partition walls, straining beams and floor slabs on the layer are synchronously dismantled, then new frame floor slabs on the layer are completed, and finally internal bearing walls of an original building are dismantled layer by layer from top to bottom. By adopting the scheme, when the inner structure of each layer is demolished and the frame is replaced synchronously, the frame replacement of the lower layer is completed, and the original inner structure of the upper layer is not demolished, so that the overall stability of the structure in the demolishing and reinforcing construction process of the whole building can be ensured, and the influence of temporary reinforcing and supporting measures on construction when a whole demolishing construction method is adopted is reduced; and the measure cost is reduced. And dismantling construction and reinforcing construction are conducted synchronously, the construction progress is accelerated, and construction safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of building construction, and in particular to a synchronous construction method for dismantling the internal structure of an existing brick-concrete building and replacing a frame. Background Art

[0002] As time goes by, many existing buildings have reached their design service life. Most of these buildings are brick-concrete structures. Some of them have been identified as Dsu level due to lack of maintenance, and can no longer meet the requirements of safety and functional use. For such brick-concrete structures, if they cannot be demolished and rebuilt, reinforcement measures need to be taken. In order to save costs and protect existing buildings with historical value, the reinforcement design is mostly to retain the external brick walls and replace the reinforced concrete frame internally, and the structural elevation of the replacement frame is consistent with the original structural elevation requirements. During construction, the construction method is often used to first remove the original internal structure from the upper layer to the lower layer, and then replace the frame from the lower layer to the upper layer for reinforcement. Retaining the stability of the exterior wall during the demolition process is the top priority to ensure construction safety. The existing construction method requires temporary reinforcement measures such as setting up scaffolding inside and outside the retained exterior wall. The construction and removal of reinforcement measures not only increase the cost, but also extend the construction time, reduce the construction efficiency, and cannot reliably guarantee the safety of the demolition construction. Summary of the invention

[0003] In order to solve the construction problems existing in the above-mentioned prior art, the present invention provides a method for synchronously constructing the internal structure of an existing brick-concrete building by dismantling and replacing the frame, and proposes a method for synchronously constructing the internal structure of an existing brick-concrete building by dismantling and replacing the frame, which is not only suitable for the internal frame replacement construction of the entire building, but also can be used for the internal frame replacement construction of a single-story building.

[0004] The technical scheme adopted by the present invention to achieve the above-mentioned purpose is: a method for synchronously constructing the demolition of the internal structure of an existing brick-concrete building and replacing the frame, which is characterized in that the construction is carried out layer by layer from bottom to top, and after the replacement frame beams and columns with the same elevation as the original structure are completed on each floor, the original non-load-bearing partition walls, tension beams and floor slabs of the layer are synchronously demolished, and then the new frame floor slabs of the layer are completed, and finally the internal load-bearing walls of the original building are demolished layer by layer from top to bottom, which specifically includes the following steps: S1. One-layer replacement inner frame foundation construction: S11, removing the interior wall skin of the exterior wall to be retained; S12: Remove the holes where the reinforced slab wall passes through the original floor slab, and construct the reinforced slab wall steel bars, formwork, and concrete; S13. Set up temporary scaffolding support under the original tension beam; S14. Remove and open holes where the replacement frame beam passes through the inner brick wall, tie steel bars and support formwork for the first-floor replacement inner frame column; S15. Replace the inner frame beam formwork, remove the concrete at the overlapping part of the original tension beam and the replacement frame beam, retain the original tension beam steel bar connection, and tie the steel bars of the replacement frame beam; S16, replace the frame columns, pour concrete for beams, and reserve slab reinforcement on the beam side; S2. Remove the original non-load-bearing partition walls, floor slabs, and tension beams on the first floor, replace the frame floor slab formwork, steel bars, and concrete construction on the first floor; and at the same time, renovate the second floor according to the above-mentioned construction method for the first floor; S3. Remove the original non-load-bearing partition walls, floor slabs, and tension beams on the second floor, replace the frame floor slab formwork, steel bars, and concrete construction on the second floor; remove the first floor and replace the frame formwork; renovate the third floor according to the above-mentioned construction method for the first floor; S4, complete the construction layer by layer according to the above construction method; S5. Finally, the internal load-bearing brick walls of each floor are demolished from top to bottom.

[0005] In the step S12, the reinforced plate wall passes through the original floor slab and the opening is removed. Specifically, the upper and lower layers of the reinforced plate wall pass through the original floor slab, the opening is removed first, and then the plate wall reinforcement is tied. The width of the opening is the replacement frame beam width + 100mm, and the position is between the original beams.

[0006] In the step S14, the holes where the replacement frame beams pass through the inner brick walls are removed. Specifically, when the replacement frame beams are constructed, some beams need to pass through the original inner brick walls, and beam holes need to be opened on the inner brick walls. 50×50×6mm angle steel lintels are added on both sides of the beam openings as temporary reinforcement lintels, and the original mortar joints are grooved and fixed with anchor glue.

[0007] In step S15, the node processing of the overlapping part of the original tension beam and the replacement frame beam is as follows: the original tension beam concrete is chiseled out here, and before chiseling out, a scaffolding support is set up under the tension beam, the steel bars in the tension beam are kept unchanged, and the width of the chiseled tension beam concrete is the same as the width of the replacement frame beam; In step S16, after the reinforcement of the newly built frame beam is tied, the column and beam concrete are poured and the joints are chiseled with the original tension beam concrete. The top of the beam is constructed to the upper surface of the newly built floor slab, and plate reinforcement is reserved on the side of the beam for subsequent connection with the cast-in-place floor slab.

[0008] The present invention is constructed layer by layer from bottom to top just like a newly built frame, which can make the elevation of the newly built frame structure consistent with the elevation of the original structure, saving the construction period of demolishing layer by layer and then rebuilding the frame layer by layer. When this scheme is used to simultaneously demolish the internal structure of each floor and replace the frame, the frame replacement of the lower floor has been completed, and the original internal structure of the upper floor has not been demolished, which can ensure the overall structural stability of the entire building during the demolition and reinforcement construction process, and reduce the impact of temporary reinforcement and support measures on the construction when the full demolition construction method is adopted, thereby reducing the cost of the measures. The demolition construction and reinforcement construction are carried out simultaneously, which speeds up the construction progress and ensures the safety of the construction. The present invention is not only applicable to the internal frame replacement construction of the entire building, but also can be used for the internal frame replacement construction of a single-story building. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0010] Figure 1 It is the effect diagram of the construction steps of the present invention; Figure 2 for Figure 1 Schematic diagram of the opening where the reinforced plate wall passes through the original floor slab at A in the middle; Figure 3 for Figure 1 Schematic diagram of the removal and opening of the hole where the replacement frame beam passes through the inner brick wall at position B in the middle; Figure 4 for Figure 1 Schematic diagram of the construction of the node where the original beam and the replacement frame beam overlap at point C in the middle. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] To facilitate understanding of the embodiments of the present invention, several specific embodiments will be further explained below with reference to the accompanying drawings, and each embodiment does not constitute a limitation on the embodiments of the present invention.

[0013] Example

[0014] like Figure 1As shown in the figure, the existing brick-concrete building internal structure demolition and frame replacement synchronous construction method is constructed from bottom to top layer by layer. After completing the replacement frame beams and columns with the same elevation as the original structure on each floor, the original non-load-bearing partition walls, tension beams and floor slabs of this floor are demolished simultaneously, and then the new frame floor slabs of this floor are completed. Finally, the internal load-bearing walls of the original building are demolished layer by layer from top to bottom. The specific steps include: S1. One-layer replacement inner frame foundation construction: S11, removing the interior wall skin of the exterior wall to be retained; S12: Remove the holes where the reinforced slab wall passes through the original floor slab, and construct the reinforced slab wall steel bars, formwork, and concrete; S13. Set up temporary scaffolding support under the original tension beam; S14. Remove and open holes where the replacement frame beam passes through the inner brick wall, tie steel bars and support formwork for the first-floor replacement inner frame column; S15. Replace the inner frame beam formwork, remove the concrete at the overlapping part of the original tension beam and the replacement frame beam, retain the original tension beam steel bar connection, and tie the steel bars of the replacement frame beam; S16, replace the frame columns, pour concrete for beams, and reserve slab reinforcement on the beam side; S2. Remove the original non-load-bearing partition walls, floor slabs, and tension beams on the first floor, replace the frame floor slab formwork, steel bars, and concrete construction on the first floor; and at the same time, renovate the second floor according to the above-mentioned construction method for the first floor; S3. Remove the original non-load-bearing partition walls, floor slabs, and tension beams on the second floor, replace the frame floor slab formwork, steel bars, and concrete construction on the second floor; remove the first floor and replace the frame formwork; renovate the third floor according to the above-mentioned construction method for the first floor; S4, complete the construction layer by layer according to the above construction method; S5. Finally, the internal load-bearing brick walls of each floor are demolished from top to bottom.

[0015] like Figure 2 As shown, in the step S12, the reinforced plate wall passes through the original floor slab and the opening is removed. Specifically, the upper and lower layers of the reinforced plate wall pass through the original floor slab, the opening is removed first, and then the plate wall reinforcement is tied. The width of the opening is the replacement frame beam width + 100mm, and the position is between the original beams.

[0016] like Figure 3 As shown, in the step S14, the holes where the replacement frame beams pass through the inner brick walls are removed. Specifically, when the replacement frame beams are constructed, part of the beams need to pass through the original inner brick walls, and beam holes need to be opened on the inner brick walls. 50×50×6mm angle steel lintels are added on both sides of the beam openings as temporary reinforcement lintels, and the original mortar joints are grooved and fixed with anchor glue.

[0017] like Figure 4As shown, in step S15, the node processing of the overlapping part of the original tension beam and the replacement frame beam is as follows: the original tension beam concrete is chiseled out here, and before chiseling out, a scaffolding support is set up under the tension beam, the steel bars in the tension beam are kept unchanged, and the width of the chiseled tension beam concrete is the same as the width of the replacement frame beam; In step S16, after the reinforcement of the newly built frame beam is tied, the column and beam concrete are poured and the joints are chiseled with the original tension beam concrete. The top of the beam is constructed to the upper surface of the newly built floor slab, and plate reinforcement is reserved on the side of the beam for subsequent connection with the cast-in-place floor slab.

[0018] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. The method of dismantling the existing brick-concrete building internal structure and replacing the frame simultaneously is characterized by: The construction is carried out from bottom to top, layer by layer. After the replacement frame beams and columns with the same elevation as the original structure are completed on each layer, the original non-load-bearing partition walls, tension beams and floor slabs of the layer are removed simultaneously, and then the new frame floor slabs of the layer are completed. Finally, the internal load-bearing walls of the original building are removed layer by layer from top to bottom. The specific steps include: S1. Construction of one-layer replacement inner frame foundation: S11, removing the interior wall skin of the exterior wall to be retained; S12. Remove the opening where the reinforced slab wall passes through the original floor slab, and construct the reinforced slab wall steel bars, formwork, and concrete. Remove the opening where the reinforced slab wall passes through the original floor slab. Specifically, the upper and lower layers of the reinforced slab wall pass through the original floor slab, first remove the opening, and then tie the slab wall steel bars. The width of the opening is the width of the replacement frame beam + 100mm, and the position is between the original beams. S13. Set up temporary scaffolding support under the original tension beam; S14. Remove the opening where the replacement frame beam passes through the inner brick wall, tie the steel bars of the first-layer replacement inner frame column, and support the formwork; when replacing the frame beam, some beams need to pass through the original inner brick wall, and beam holes need to be opened on the inner brick wall. 50×50×6mm angle steel lintels are added on both sides of the beam opening as temporary reinforcement lintels, and the original mortar joints are grooved and fixed with anchor glue; S15. Replace the inner frame beam template, remove the concrete of the overlapping part of the original tension beam and the replacement frame beam, keep the original tension beam steel bar connection, and tie the steel bars of the replacement frame beam; the node treatment of the overlapping part of the original tension beam and the replacement frame beam is as follows: chisel out the original tension beam concrete here, set up scaffolding support under the tension beam before chiseling, keep the steel bars in the tension beam unchanged, and chisel out the tension beam concrete to the same width as the replacement frame beam; S16, replace the frame columns and beams with concrete, and reserve slab reinforcement on the beam side; after tying the reinforcement of the new frame beams, pour the column and beam concrete and chisel the joints with the original tension beam concrete, and construct the top of the beam to the upper surface of the new floor slab, and reserve slab reinforcement on the beam side for subsequent connection with the cast-in-place floor slab; S2. Remove the original non-load-bearing partition walls, floor slabs, and tension beams on the first floor, replace the frame floor slab formwork, steel bars, and concrete construction on the first floor; and at the same time, renovate the second floor according to the above-mentioned construction method for the first floor; S3. Remove the original non-load-bearing partition walls, floor slabs, and tension beams on the second floor, replace the frame floor slab formwork, steel bars, and concrete construction on the second floor; remove the first floor and replace the frame formwork; renovate the third floor according to the above-mentioned construction method for the first floor; S4, complete the construction layer by layer according to the above construction method; S5. Finally, the internal load-bearing brick walls of each floor are demolished from top to bottom.

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