Space truss supporting system for demolition and reconstruction of existing building

Abstract

The utility model discloses a space truss supporting system used for demolition and reconstruction of an existing building, which comprises a newly added steel column arranged at the end part of a reserved cross wall; the first building body reinforcing trusses are single-layer chord member trusses, and the two first building body reinforcing trusses are symmetrically arranged on the south side and the north side of the top layer of the first building body; the second building body reinforcing trusses are three-layer chord member trusses, and the two second building body reinforcing trusses are symmetrically arranged on the south side and the north side of the top layer and the secondary top layer of the second building body; the third building body reinforcing trusses are three-layer chord member trusses, and the third building body reinforcing trusses are symmetrically arranged on the second top layer and the south side and the north side of the third layer of the third building body; the two ends of the first building reinforcing truss, the two ends of the second building reinforcing truss and the two ends of the third building reinforcing truss are fixedly connected with the newly-added steel columns correspondingly. The newly-added steel column can be used as a temporary support in the dismantling process, a space truss supporting system can be used for indoor steel beam column system construction when a newly-built steel structure of a main building is constructed, and construction efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of existing building demolition and renovation technology, specifically to a space truss support system for existing building demolition and renovation. Background Technology

[0002] In practical engineering projects, numerous structural demolition and alteration projects of old buildings are often involved. Many of these projects require retaining the original building's external dimensions and some structural elements, while modifying and reinforcing the internal structure. Taking one project as an example, the original structural system of the old building was a load-bearing structure with longitudinal and transverse walls. Each floor had structural columns and ring beams, and the roof slabs were precast perforated slabs with some cast-in-place sections. The demolition required retaining the T-shaped brick-concrete structural walls on the east and west sides, removing the middle transverse walls, constructing a new steel structure internally, creating a hybrid structure with the original retained structure, and changing the internal function. However, the removal of the internal walls resulted in an incomplete original structure, posing significant safety hazards. Therefore, a structural system that reinforces and supports the retained structure during construction is needed. Utility Model Content

[0003] The purpose of this invention is to provide a space truss support system for the demolition and renovation of existing buildings, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides a spatial truss support system for the demolition and renovation of existing buildings. The existing building includes a main building, which comprises a first floor, a second floor, and a third floor. The first floor has three floors, the second floor has four floors, and the third floor has five floors. The main building's structural system is a longitudinal and transverse wall load-bearing structure. The structures to be demolished are the load-bearing walls of the main building's interior areas, while the structures to be retained are the T-shaped walls on the east and west sides. The spatial truss support system for the demolition and renovation of existing buildings includes: newly added steel columns, with multiple newly added steel columns installed at the ends of the retained transverse walls of the T-shaped walls on the east and west sides, and adjacent new steel columns... New steel beams are installed between the steel columns; the first floor reinforcement truss is a single-layer chord truss, with two first floor reinforcement trusses symmetrically arranged on the north and south sides of the top floor of the first floor; the second floor reinforcement truss is a three-layer chord truss, with two second floor reinforcement trusses symmetrically arranged on the north and south sides of the top floor and the second-to-top floor of the second floor; the third floor reinforcement truss is a three-layer chord truss, with the third floor reinforcement truss symmetrically arranged on the north and south sides of the second-to-top floor and the third floor of the third floor; the two ends of the first, second, and third floor reinforcement trusses are fixedly connected to the new steel columns.

[0005] In a preferred embodiment, the first building reinforcement truss includes two sets of first chords, second chords, and multiple temporary support round bars arranged parallel to the transverse wall. The first chords are located at both ends of the second chords, and the outer ends of the first chords are fixedly connected to the newly added steel columns. The ends of the temporary support round bars located on the outer side are also fixedly connected to the newly added steel columns.

[0006] In a preferred embodiment, the second and third building reinforcement trusses each include a first-layer chord frame, a second-layer chord truss, a third-layer chord truss, vertical connecting chords, and multiple temporary supporting round bars. The ends of the temporary supporting round bars at both ends and on the outer sides of the first-layer chord frame, the second-layer chord truss, and the third-layer chord truss are fixedly connected to the newly added steel columns. The vertical connecting chords are fixedly connected to the first-layer chord frame, the second-layer chord truss, and the third-layer chord truss, respectively.

[0007] In a preferred embodiment, the newly added steel columns connected to the retained transverse walls adopt a segmented structure, wherein the newly added steel columns in the underground part are all set as one segment, the newly added steel columns in the first building above ground are set as one segment, the newly added steel columns in the second building are set as two segments, and the newly added steel columns in the third building are set as one segment from the first to the third floor and one segment from the fourth to the fifth floor.

[0008] In a preferred embodiment, a cut is made in the horizontal wall at the installation position of the new steel column below the ground beam in the vertical direction. The new steel column is vertically installed in the cut. The top of the new steel column is 200mm away from the lowest point of the ground beam. The bottom of the new steel column is fixedly connected to the original ground beam by mechanical anchor bolts.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model adds new steel columns at the ends of the retained transverse walls, and the new steel columns and beams serve as temporary supports during the subsequent demolition process. By setting up a first floor reinforcement truss, a second floor reinforcement truss, and a third floor reinforcement truss, and installing them layer by layer from top to bottom as the building is demolished, the installed space truss support system can be used for the construction of the indoor steel beam and column system during the later construction of the main building's new steel structure. This saves steel and construction time, and ensures overall stability and safety. Attached Figure Description

[0010] Figure 1 This is a schematic diagram showing the division of the demolished wall area and axis in this utility model.

[0011] Figure 2 A construction schematic diagram of adding a steel column at the end of the retained transverse wall in this utility model;

[0012] Figure 3 This is a plan view of the completed construction of the first, second, and third building reinforcement trusses of this utility model;

[0013] Figure 4 for Figure 3 Schematic diagram of the AA section;

[0014] Figure 5 for Figure 3 Schematic diagram of the BB cross section;

[0015] Figure 6 for Figure 3 Schematic diagram of the CC section;

[0016] Figures 7 to 20 This is a schematic diagram illustrating the construction process of the main building's phased and floor-by-floor demolition and the spatial truss support system according to this utility model. Detailed Implementation

[0017] The technical solutions in the embodiments of this utility model will be clearly and completely described below. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0018] Example 1:

[0019] This embodiment uses a demolition and renovation project of an existing building as an example. The main building is a masonry structure, originally used as a dormitory. From south to north, the main building consists of a three-story first building (901), a four-story second building (902), and a five-story third building (903). The seismic fortification category is Class C. The building height is 17.8 meters, and the foundation type is strip foundation. The original structural system of the main building is a longitudinal and transverse wall load-bearing structure with strip foundation. The thickness of the external load-bearing walls is 370 mm, and the thickness of the internal walls is 240 mm. Each floor has structural columns and ring beams. The floor (roof) slabs are precast perforated slabs, with some cast-in-place slabs. The maximum length of the building in the north-south direction is 61.2 meters, the width in the east-west direction is 17.45 meters, the bay width is 3.6 meters, the depth is 7.64 meters, the corridor width is 1.8 meters, the floor height is 3.2 meters, and the indoor-outdoor height difference is 0.6 meters. The number of floors remains unchanged after the renovation. The reinforced structural system is a hybrid steel structure and masonry structure. The building height after the renovation is 18.1 meters, with four floors in the main functional areas and five floors in some areas. The foundations for the newly erected steel columns in the middle are independent foundations. The 11 T-shaped walls on the east and west sides of the main building are retained and reinforced with reinforced concrete surfaces. The interior uses a newly constructed steel structure. Before demolition, the above-ground walls of the main building will be reinforced first, followed by the demolition of the main building in sections and floors, and the construction of the space truss support system.

[0020] The spatial truss support system of this embodiment includes: newly added steel columns 1, steel beams 2, a first-floor reinforcement truss 3, a second-floor reinforcement truss 4, and a third-floor reinforcement truss 5. Multiple newly added steel columns 1 are installed at the ends of the retained transverse walls 10 of the T-shaped walls on the east and west sides, and newly added steel beams 2 are installed between adjacent newly added steel columns 1. The first-floor reinforcement truss 3 is a single-layer chord truss, and two first-floor reinforcement trusses 3 are symmetrically arranged on the north and south sides of the top floor of the first floor. The second-floor reinforcement truss 4 is a three-layer chord truss, and two second-floor reinforcement trusses 4 are symmetrically arranged on the north and south sides of the top floor and the second-to-top floor of the second floor. The third-floor reinforcement truss 5 is a three-layer chord truss, and the third-floor reinforcement truss 5 is symmetrically arranged on the north and south sides of the second-to-top floor and the third floor of the third floor. The two ends of the first-floor reinforcement truss 3, the second-floor reinforcement truss 4, and the third-floor reinforcement truss 5 are fixedly connected to the newly added steel columns 1.

[0021] The first building reinforcement truss 3 includes two sets of chord frames arranged parallel to the transverse walls. Each set of chord frames includes two first chords 31, a second chord 32, and multiple temporary support round bars 33. The first chords 31 are located at both ends of the second chords 32. The outer ends of the first chords 31 are fixedly connected to the newly added steel columns 1. A transverse support round bar 34 and an oblique support round bar 35 are respectively arranged between the two sets of parallel first chords 31 and between the two sets of parallel second chords 32 in each first building reinforcement truss 3. The outer ends of the multiple temporary support round bars 33 are fixedly connected to the newly added steel columns 1.

[0022] The second-floor reinforcement truss 4 and the third-floor reinforcement truss 5 each include a first-layer chord frame 41, a second-layer chord truss 42, a third-layer chord truss 43, vertical connecting chords 44, and multiple temporary supporting round bars 33. The ends and outer ends of the temporary supporting round bars 45 at both ends and on the outside of the first-layer chord frame 41, the second-layer chord truss 42, and the third-layer chord truss 43 are fixedly connected to the newly added steel columns 1. The vertical connecting chords 44 are fixedly connected to the first-layer chord frame 41, the second-layer chord truss 42, and the third-layer chord truss 43, respectively. Lateral supporting round bars 34 and diagonal supporting round bars 35 are respectively installed between the first-layer chord frame 41 and the second-layer chord truss 42, between the second-layer chord truss 42 and the third-layer chord truss 43, and between two sets of parallel chord frames of the first-layer chord frame 41, the second-layer chord truss 42, and the third-layer chord truss 43.

[0023] Example 2:

[0024] This utility model adds a new steel column 1 at the end of the retained transverse wall. The new steel column and steel beam serve as temporary supports during the demolition process and are installed first. The new steel column 1 connected to the retained transverse wall 10 adopts a segmented structure, with the underground part being set as one segment, the first floor of the above-ground part being set as one segment, the second floor being set as two segments, the first to third floors of the third floor being set as one segment, and the fourth to fifth floors being set as one segment.

[0025] During the construction of the new steel column 1, the wall below the ground beam 6 at the installation location of the new steel column 1 is first cut. The ground beam 6 is not cut, as it supports the upper structural wall and meets the load-bearing requirements. The horizontal wall below the ground beam 6 is then vertically cut at the steel column installation location. The new steel column is manually transported from the nearby window and placed obliquely into the cut for alignment and installation. After installation, the new steel column 1 is vertically positioned within the cut. The top of the new steel column 1 is 200mm from the lowest point of the ground beam, and the bottom of the new steel column 1 is fixedly connected to the original structural ground beam using mechanical anchor bolts 7.

[0026] The main building was demolished in sections and floors, and the spatial truss support system was constructed by demolishing the load-bearing walls of the interior areas of the main building layer by layer and section by section, in the order of top to bottom, south to north, and horizontal components first and then vertical components. The brick-concrete structure walls on the east and west sides were preserved as a whole. As the demolition proceeded layer by layer, the spatial truss support system was installed layer by layer from top to bottom. The specific steps included the following:

[0027] The main building is divided into different sections. The first section, 901, is divided into axes 1 to 6 from south to north. The second section, 902, is divided into axes 7 to 12 from south to north. The third section, 903, is divided into axes 13 to 18 from south to north.

[0028] Step S1: Based on the construction drawings, determine the demolition sequence and the installation sequence of the reinforcement trusses for different floors of different buildings;

[0029] Step S2: Demolish the load-bearing walls in the shaded areas of the main building, layer by layer and section by section, from south to north (e.g., Figure 1 (As shown in the shaded area), as the structure is dismantled layer by layer, the reinforcing trusses are installed layer by layer from top to bottom.

[0030] Specifically, in step S2, based on the construction drawings, the demolition sequence for different floors of different buildings and the installation sequence for the reinforcing trusses are determined, including:

[0031] Step S21: Demolition of the area along axes 1 to 6 on the top floor of the first building and axes 1 to 3 on the second-to-top floor. The area filled in the diagram below for the top floor and second-to-top floor of the first building (901) will be demolished using large long-arm hydraulic shears. Walls required to be retained according to the drawings will not be demolished. Demolition scope for the third floor: axes 1-6 at elevations above 6.35m, including axis 6; Demolition scope for the second floor: axes 1-3 at elevations above 3.15m, excluding axis 3. Figure 7 As shown.

[0032] Step S22: Construction of the first reinforcement truss of the first building on the top floor, as follows: Figure 8 As shown.

[0033] Step S23: Partial demolition of the original structure of the first and second floors of the first building. The original structure of the first and second floors of the first building is demolished using short-arm hydraulic shears (e.g., Figure 9 (Central oblique line filling area), Second floor demolition scope: Above 3.15m of the 3rd to 5th axes, excluding the 5th axis; First floor demolition scope: Above -0.6m of the 1st to 5th axes, excluding the 5th axis.

[0034] Step S24: Demolition of the area along axes 6 to 10 on the top and second-to-top floors of the second building (902). Demolition of the top and second-to-top floors of the second building (e.g.) Figure 10 (Diagonal line filling area), fourth floor demolition scope: the elevation of axes 6-10 above 6.35m, excluding axis 10; third floor demolition scope: the elevation of axes 6-10 above 3.15m, excluding axis 10.

[0035] Step S25: Construction of the second reinforcing truss on the top floor of the first building and the first reinforcing truss on the top floor of the second building, as follows: Figure 11 As shown.

[0036] Step S26: Demolition of the remaining area of ​​the first building and partial demolition of the original structure on the first and second floors of the second building. (e.g.,...) Figure 12 (Central oblique line filling area), Second floor demolition scope: Above 6.35m of the 5th to 10th axes, excluding the 10th axis; First floor demolition scope: Above -0.6m of the 5th to 10th axes, excluding the 10th axis.

[0037] Step S27: Construction of the first reinforcement truss of the second building at the third floor location, as follows... Figure 13 As shown.

[0038] Step S28: Demolition of the top and second-to-top sections of the northern half of the second building, and the top and second-to-top sections of the third building (e.g.) Figure 14 (Central oblique line filling area), the demolition scope of the fifth floor: the elevation of the 12th to the 15th axes above 12.75m, excluding the 15th axis; the demolition scope of the fourth floor: the elevation of the 10th to the 15th axes above 9.55m, excluding the 15th axis; the demolition scope of the third floor: the elevation of the 10th to the 12th axes above 5.35m, including the 11th axis.

[0039] Step S29: Construction of the second reinforcing truss on the top floor of the second building and the first reinforcing truss on the fourth floor of the third building, as follows: Figure 15 As shown.

[0040] Step S30: Demolition of the remaining area of ​​the second building and the original structure of the southern half of the third building from the first to the third floor (e.g.) Figure 16 (Central oblique line filling area), the demolition scope of the third floor: the elevation of the 11th to the 15th axes above 6.35m, excluding the 15th axis; the demolition scope of the second floor: the elevation of the 10th to the 15th axes above 3.15m, excluding the 15th axis; the demolition scope of the first floor: the elevation of the 12th to the 15th axes above -0.6m, excluding the 15th axis.

[0041] Step S31: Demolish the original structure of the top and second-to-top floors of the northern half of the third building (e.g.) Figure 17 (Central oblique line filling area), the demolition scope of the fifth floor: the elevation of axis 15-18 above 12.75m, including axis 18; the demolition scope of the fourth floor: the elevation of axis 15-17 above 9.55m, including axis 17; the elevation of axis 17-18 above 8.55m, including axis 18.

[0042] Step S32: Install the second reinforcing truss of the third building at the fourth floor position, as follows. Figure 18 As shown.

[0043] Step S33: Demolition of the remaining original structure of the third building (e.g.) Figure 19 (The area is filled with a diagonal line).

[0044] Step S34: Install the second reinforcing truss of the third floor at the third floor position. The wall demolition is completed, and a spatial truss support system is formed, as shown below. Figure 20 and Figure 3 As shown.

[0045] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A space truss support system for deconstruction and retrofitting of existing buildings, characterized by: The existing building comprises a main building, the main building comprises a first building body, a second building body and a third building body, wherein the first building body is three layers, the second building body is four layers, and the third building body is five layers; the main building structural system is a longitudinal and transverse wall bearing structure; the demolished structure is the indoor area bearing wall of the main building; the retained structure is the east-west two side T-shaped walls; the space truss support system for the demolition and reconstruction of the existing building comprises: Newly-added steel columns, a plurality of newly-added steel columns are arranged at the end of the retained transverse wall of the east-west two side T-shaped walls, and a newly-added steel beam is arranged between the adjacent two newly-added steel columns; A first building body reinforcing truss, which is a single-layer chord truss, is symmetrically arranged on the north and south sides of the top layer of the first building body; A second building body reinforcing truss, which is a three-layer chord truss, is symmetrically arranged on the north and south sides of the top layer and the sub-top layer of the second building body; A third building body reinforcing truss, which is a three-layer chord truss, is symmetrically arranged on the north and south sides of the sub-top layer and the third layer of the third building body; Wherein, the two ends of the first building body reinforcing truss, the second building body reinforcing truss and the third building body reinforcing truss are fixedly connected with the newly-added steel columns.

2. The space truss support system for deconstruction and retrofitting of existing buildings according to claim 1, wherein: The first building body reinforcing truss comprises two groups of first chords, second chords and a plurality of temporary support round rods arranged parallel to the transverse wall, wherein the first chords are located at the two ends of the second chords, the outer ends of the first chords are fixedly connected with the newly-added steel columns, and the end portions of the temporary support round rods located on the outer side are fixedly connected with the newly-added steel columns.

3. The space truss support system for deconstruction and retrofitting of existing buildings of claim 2, wherein: The second building body reinforcing truss and the third building body reinforcing truss each comprise a first layer chord truss, a second layer chord truss, a third layer chord truss, a vertical connecting chord and a plurality of temporary support round rods, wherein the end portions of the temporary support round rods at the two ends and on the outer side of the first layer chord truss, the second layer chord truss and the third layer chord truss are fixedly connected with the newly-added steel columns, and the vertical connecting chords are fixedly connected with the first layer chord truss, the second layer chord truss and the third layer chord truss.

4. The space truss support system for deconstruction and retrofitting of existing buildings of claim 3, wherein: The newly-added steel columns connected with the retained transverse wall adopt a segmented structure, wherein the newly-added steel columns in the underground part are each arranged in one segment, the newly-added steel columns of the first building body in the aboveground part are arranged in one segment, the newly-added steel columns of the second building body are arranged in two segments, the newly-added steel columns of the third building body from the first layer to the third layer are arranged in one segment, and the newly-added steel columns of the third building body from the fourth layer to the fifth layer are arranged in one segment.

5. The space truss support system for deconstruction and retrofitting of existing buildings of claim 1, wherein: The transverse wall at the installation position of the newly-added steel column below the floor beam is provided with a cutout in the vertical direction, the newly-added steel column is vertically arranged in the cutout, the top of the newly-added steel column is 200mm away from the lowest point of the floor beam, and the bottom of the newly-added steel column is fixedly connected with the original structure floor beam through a mechanical anchor bolt.

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