Reinforcing method of old common wall structure based on frame structure conversion

Abstract

The invention relates to the technical field of old building reinforcement, in particular to a method for reinforcing an old common wall structure based on frame structure conversion. The reinforcing method for the old common wall structure based on frame structure conversion specifically comprises the following steps that a foundation is constructed, specifically, a bearing platform foundation is poured at the position, close to a common wall, of the to-be-dismantled side; a back supporting structure is installed, specifically, a first connecting plate is fixed to the lower portion of an original frame beam, a second connecting plate is fixed to the upper portion of a bearing platform foundation, and the two ends of a back supporting column body are fixedly connected with the first connecting plate and the second connecting plate respectively; segmenting the floor slab: determining the segmentation boundary of the floor slab to be reserved and dismantled, and carrying out paying-off positioning; dismantling an original building frame: firstly dismantling floor slabs and then dismantling beams; construction of a newly-built structure: constructing a newly-built building on one side of the common wall; and the common wall protection structure is dismantled, specifically, after construction of the newly-built structure is completed and an effective support is formed for the common wall, static cutting dismantling is conducted on the common wall protection structure. The method has the advantages that excessive damage to the common wall is avoided, and the stability of the original structure is kept.

Description

Technical Field

[0001] The present invention relates to the technical field of old building reinforcement, and in particular to a reinforcement method for an old common wall structure based on frame structure conversion. Background Art

[0002] Most old buildings use brick-concrete or frame structures, and two adjacent buildings often share a wall. During the renovation of old buildings, it is possible that the building on one side of the shared wall is first demolished and renovated as a whole, while the other side is not renovated for the time being. If the building on one side of the shared wall is demolished rashly, the overall stability of the original building structure may be destroyed, causing the building on the other side to lose support and tilt or even collapse, thereby posing a safety risk to the lives and property of surrounding personnel. Therefore, temporary reinforcement of the shared wall is required during the renovation of the building.

[0003] At present, this type of common wall reinforcement can be achieved by wrapping the outer wall of the old building with steel structure, and directly penetrating its outer wall with steel bars to connect the steel structure. This type of temporary reinforcement method requires a large amount of steel structure, and most of the steel bars need to be drilled and connected on the outer wall, which will cause certain damage to the outer wall structure of the old building, which is not conducive to the protection and reinforcement of old buildings, and brings great inconvenience to the renovation of old buildings. It is also possible to reinforce the common wall by setting up scaffolding on one side, but it is not suitable for situations where the common wall height is high, the construction space is small, and the wall strength is low. The height-to-width ratio of the scaffolding is difficult to meet the requirements of the specification, and too many wall connectors on the common wall will cause damage to the wall.

[0004] Therefore, in view of the shortcomings of the prior art, a reinforcement method for an old common wall structure based on frame structure conversion is provided. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a reinforcement method for old common wall structures based on frame structure conversion, aiming to solve the protection of common walls and unrenovated structures during the renovation of old buildings and ensure the overall stability, safety and reliability of the structure.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A reinforcement method for an old common wall structure based on frame structure conversion comprises the following steps:

[0008] S1. Construction foundation: pour the cap foundation near the common wall on the side to be demolished;

[0009] S2: Install the back-support structure: fix the first connecting plate below the original frame beam, fix the second connecting plate above the cap foundation, and fix the first connecting plate and the second connecting plate at both ends of the back-support column;

[0010] S3: Split floor: determine the split boundary of the floor to be retained and to be demolished, and perform positioning;

[0011] S4: Dismantle the original building frame: first remove the floor slab, then remove the beam;

[0012] S5: Construction of new structure: Construction of new building on the common wall side;

[0013] S6: Removal of common wall protection structure: After the construction of the new structure is completed and forms an effective support for the common wall, the common wall protection structure is removed by static cutting.

[0014] As a further improvement of the technical solution of the present invention, in step S1, construction preparation: take safety protection measures on site, prepare the machinery and materials required for construction in advance, and do a good job in on-site construction measurement and positioning.

[0015] As a further improvement of the technical solution of the present invention, in step S1, when the soil layer is in good condition, the cap foundation is poured separately;

[0016] When the soil condition is poor, the pedestal foundation + pile foundation is used.

[0017] As a further improvement of the technical solution of the present invention, in step S2, after the back-bracing columns are installed, the diagonal bracing steel pipes, the transverse steel beams and the parallel bracing steel pipes are installed simultaneously.

[0018] As a further improvement of the technical solution of the present invention, one end of the diagonal bracing steel pipe is connected to the top of the back-bracing column, and the other end is connected to the foot of the back-bracing column at the opposite diagonal of the same span;

[0019] The transverse steel beam spans across the back-supporting column, and the transverse steel beam is connected with the back-supporting column and the diagonal steel pipe;

[0020] One end of the catapult steel pipe is connected to the top of the return support column, and the other end is in contact with the ground.

[0021] As a further improvement of the technical solution of the present invention, in step S2, when the first connecting plate and the second connecting plate are installed, adhesive steel glue is applied on the connecting surface, and the first connecting plate and the second connecting plate are fixedly connected to the original frame beam and the pedestal foundation by chemical bolts.

[0022] As a further improvement of the technical solution of the present invention, in step S3, static cutting is used during segmentation.

[0023] As a further improvement of the technical solution of the present invention, in step S4, when dismantling the floor slab, the floor slab is dismantled in blocks, a single floor slab is temporarily fixed before cutting, and then the beams are cut in blocks, and finally the remaining structural beams, columns, floor slabs and other components are dismantled.

[0024] As a further improvement of the technical solution of the present invention, the side length of a single block is about 1m-1.5m. The floor slab is divided into blocks by marking before cutting, and an anchor ring is set in the middle of each block. An anchor ring is also set on the adjacent beam, and the two are connected by a rope chain.

[0025] As a further improvement of the technical solution of the present invention, in step S6, a construction method of top-down and segmented demolition is adopted, and after each section of the beam building is demolished, the cantilever steel beams of the new structure in the area and the sealing beams close to the common wall are immediately installed.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] In the reinforcement method of the old common wall structure based on the conversion of the frame structure of the present invention, the construction is carried out with the help of the original partial structure, and the partial structure of the original building is used to transform and construct a new common wall protection structure. There is no need to set a tie node on the original structure, which reduces the safety disturbance to the original structure of the common wall and ensures the safety of the construction; it can effectively avoid causing excessive damage to the common wall, and retain the stability of the original structure as much as possible during the renovation of the old building on one side, which is conducive to the protection and reinforcement of old buildings. The reinforcement method of the old common wall structure based on the conversion of the frame structure has the characteristics of avoiding excessive damage to the common wall and retaining the stability of the original structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The technology of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0029] Figure 1 It is a vertical cross-sectional view of the structure after the back-up column of the present invention is installed.

[0030] Figure 2 It is a cross-sectional view of the structure after the back-up column of the present invention is installed.

[0031] Figure 3 This is a schematic diagram of the retained and removed divided elevations of the present invention.

[0032] Figure 4 It is a schematic diagram of the retention and removal division plane of the present invention.

[0033] Figure 5 It is a side elevation schematic diagram after the common wall protection structure of the present invention is completed.

[0034] Figure 6 It is a schematic diagram of the front elevation after the common wall protection structure of the present invention is completed.

[0035] Figure 7 It is a schematic plan view of the strip cap foundation of the common wall protection structure of the present invention.

[0036] Figure 8It is a schematic elevation diagram of the independent cap foundation + pile foundation of the common wall protection structure of the present invention.

[0037] Fig. 9 It is a plan view of an independent cap foundation + pile foundation of a common wall protection structure of the present invention.

[0038] Fig.10 It is a schematic plan view of the connection between the back-supporting column and the original frame beam of the present invention.

[0039] Fig.11 It is a schematic elevation diagram of the connection between the back-supporting column and the original frame beam of the present invention.

[0040] Fig.12 It is a schematic diagram of the demolishing floor slab and cutting it into blocks according to the present invention.

[0041] In the figure:

[0042] 1. Common wall; 2. Original frame column; 3. Original frame beam;

[0043] 41. Back-supporting column; 42. Cap foundation; 43. Diagonal bracing steel pipe; 44. Transverse steel beam; 45. Forward bracing steel pipe; 46. First connecting plate; 47. Second connecting plate; 48. Pile foundation;

[0044] 5. Floor slab; 6. Partition joint; 7. Chemical bolt; 8. Anchor ring; 9. Rope chain. DETAILED DESCRIPTION

[0045] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0046] It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature, or it may be indirectly fixed or connected to the other feature. In addition, the descriptions of up, down, left, right, etc. used in the present invention are only relative to the relative positional relationship of the components of the present invention in the drawings.

[0047] Reference Figures 1 to 12 , a reinforcement method for an old common wall structure based on frame structure conversion, comprising the following steps:

[0048] S1. Construction foundation: pour the cap foundation 42 near the common wall 1 on the side to be demolished;

[0049] S2: Install the back-support structure: fix the first connecting plate 46 below the original frame beam 3, fix the second connecting plate 47 above the cap foundation 42, and fix the first connecting plate 46 and the second connecting plate 47 at both ends of the back-support column 41;

[0050] S3: Splitting floor 5: Determine the splitting boundary of floor 5 to be retained and to be demolished, and adopt static cutting to perform line positioning during splitting;

[0051] S4: Dismantle the original building frame: first dismantle floor 5, then dismantle the beams;

[0052] S5: Construction of new structure: Construction of new building on one side of common wall 1;

[0053] S6: Demolition of the common wall 1 protection structure: After the construction of the new structure is completed and forms an effective support for the common wall, the common wall 1 protection structure is statically cut and demolished.

[0054] Among them, during the construction process, the construction is carried out with the help of the original partial structure, and the partial structure of the original building is used to transform and construct a new common wall 1 protection structure. There is no need to set a tie node on the original structure, which reduces the safety disturbance to the original structure of the common wall 1 and ensures the safety of the construction; it can effectively avoid causing excessive damage to the common wall 1, and preserve the stability of the original structure as much as possible during the renovation of the old building on one side, which is conducive to the protection and reinforcement of old buildings. This reinforcement method for the old common wall structure based on the conversion of the frame structure has the characteristics of avoiding excessive damage to the common wall 1 and preserving the stability of the original structure. It saves construction materials and labor, reduces construction costs, and speeds up the construction period.

[0055] In one embodiment, in step S1, construction preparation: take safety precautions on site, prepare the machinery and materials required for construction in advance, and perform on-site construction measurement and positioning.

[0056] In one embodiment, in step S1, different cap foundation 42 structures can be selected according to different soil conditions. When the soil condition is good, the cap foundation 42 is cast alone; when the soil condition is poor, the cap foundation 42 + pile foundation 48 is used. The pile foundation 48 can be a micro steel pipe cast-in-place pile or a tree root pile. Figure 7-Figure 9 As shown, preferably, the pedestal foundation 42 includes a strip pedestal foundation 42 and an independent pedestal foundation 42. The strip pedestal foundation 42, i.e., a strip pedestal foundation 42 is provided with multiple support columns 41, and the independent pedestal foundation 42, i.e., an independent pedestal foundation 42 is provided with a single support column 41. Before the concrete pouring of the pedestal foundation 42, the top surface steel plate can be pre-embedded to reduce the subsequent planting of reinforcement or the installation of chemical anchors for connection.

[0057] In one embodiment, referring to Figure 5-Figure 6As shown, in step S2, after the back-support column 41 is installed, the diagonal bracing steel pipe 43, the diaphragm steel beam 44 and the bracing steel pipe 45 are installed simultaneously. One end of the diagonal bracing steel pipe 43 is connected to the top of the back-support column 41, and the other end is connected to the foot of the back-support column 41 of the same span; the diaphragm steel beam 44 spans the back-support column 41, and the diaphragm steel beam 44 is connected to the back-support column 41 and the diagonal bracing steel pipe 43; one end of the bracing steel pipe 45 is connected to the top of the back-support column 41, and the other end is in contact with the ground. The components such as the back-support steel column 5, the diaphragm steel beam 4411, the diagonal bracing steel pipe 4310, and the bracing steel pipe 458 are preferably square steel pipes, and the corresponding size and thickness need to be reviewed by the design technology. Circular steel pipes, H-shaped steel, channel steel or other cross-sections can also be used, and the design is safe and meets the on-site construction conditions.

[0058] In one embodiment, referring to Figure 10-11 As shown, in step S2, when the first connecting plate 46 and the second connecting plate 47 are installed, steel glue is applied on the connecting surface, and the first connecting plate 46 and the second connecting plate 47 are fixedly connected to the original frame beam 3 and the cap foundation 42 by chemical bolts 7. Preferably, the first connecting plate 46 and the second connecting plate 47 are both steel plates.

[0059] In one embodiment, referring to Figure 3 , Figure 4 and Fig.12 As shown, in step S4, when the floor slab 5 is removed, the floor slab 5 is removed in blocks, and a single floor slab 5 is temporarily fixed before cutting, and then the beams are cut in blocks, and finally the remaining structural beams, columns, floor slabs 5 and other components are removed. The side length of the cut single block is about 1m-1.5m. Before cutting, the floor slab 5 is marked and divided into blocks, and an anchor ring 8 is set in the middle of each block, and an anchor ring 8 is also set on the adjacent beam, and the two are connected by a rope chain 9 to ensure that the concrete block falls directly to the ground after cutting, causing impact on the structure or causing personal injury.

[0060] In one embodiment, in step S6, a construction method of top-down, segmented demolition is adopted, and after each section of the beam building is demolished, the newly constructed cantilevered steel beams of the area and the sealing beams close to the common wall 1 are immediately installed to ensure that the common wall 1 is effectively supported.

[0061] For other contents of the reinforcement method of the old common wall structure based on frame structure conversion described in the present invention, please refer to the prior art and will not be repeated here.

[0062] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A reinforcement method for an old common wall structure based on frame structure conversion, characterized in that: The steps include: S1. Construction foundation: pour the cap foundation near the common wall on the side to be demolished; S2: Install the back-support structure: fix the first connecting plate below the original frame beam, fix the second connecting plate above the cap foundation, and fix the first connecting plate and the second connecting plate at both ends of the back-support column; S3: Split floor: determine the split boundary of the floor to be retained and to be demolished, and perform positioning; S4: Dismantle the original building frame: first remove the floor slab, then remove the beam; S5: Construction of new structure: Construction of new building on the common wall side; S6: Removal of common wall protection structure: After the construction of the new structure is completed and forms an effective support for the common wall, the common wall protection structure is removed by static cutting.

2. The reinforcement method of an old common wall structure based on frame structure conversion according to claim 1 is characterized in that: In step S1, construction preparation: take safety precautions on site, prepare the machinery and materials required for construction in advance, and do on-site construction measurement and positioning.

3. The reinforcement method of an old common wall structure based on frame structure conversion according to claim 1 is characterized in that: In step S1, when the soil condition is good, the cap foundation is poured separately; When the soil condition is poor, the pedestal foundation + pile foundation is used.

4. The reinforcement method of an old common wall structure based on frame structure conversion according to claim 1 is characterized in that: In step S2, after the back-supporting columns are installed, the diagonal bracing steel pipes, the transverse steel beams and the parallel bracing steel pipes are installed simultaneously.

5. The reinforcement method of an old common wall structure based on frame structure conversion according to claim 4 is characterized in that: One end of the diagonal bracing steel pipe is connected to the top of the back-bracing column, and the other end is connected to the foot of the back-bracing column at the opposite diagonal of the same span; The transverse steel beam spans across the back-supporting column, and the transverse steel beam is connected with the back-supporting column and the diagonal steel pipe; One end of the catapult steel pipe is connected to the top of the return support column, and the other end is in contact with the ground.

6. The reinforcement method of an old common wall structure based on frame structure conversion according to claim 1 is characterized in that: In step S2, when the first connecting plate and the second connecting plate are installed, adhesive steel glue is applied on the connecting surface, and the first connecting plate and the second connecting plate are fixedly connected to the original frame beam and the cap foundation by chemical bolts.

7. The reinforcement method of an old common wall structure based on frame structure conversion according to claim 1 is characterized in that: In step S3, static cutting is used for segmentation.

8. The reinforcement method of an old common wall structure based on frame structure conversion according to claim 1 is characterized in that: In step S4, when dismantling the floor slab, the floor slab is dismantled in blocks, a single floor slab is temporarily fixed before cutting, and then the beams are cut in blocks, and finally the remaining structural beams, columns, floor slabs and other components are dismantled.

9. The reinforcement method of an old common wall structure based on frame structure conversion according to claim 8 is characterized in that: The side length of a single block is about 1m-1.5m. Before cutting, the floor slab is divided into blocks by marking, and an anchor ring is set in the middle of each block. An anchor ring is also set on the adjacent beam, and the two are connected by a rope chain.

10. The reinforcement method of an old common wall structure based on frame structure conversion according to claim 1 is characterized in that: In step S6, a construction method of top-down, segmented demolition is adopted, and after each section of the beam building is demolished, the newly constructed cantilevered steel beams of the area and the sealing beams close to the common wall are installed.

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