Construction method for storey-adding reinforcement and reconstruction of framed bent plant

Abstract

The invention discloses a bent frame plant storey-adding reinforcement and transformation construction method which comprises the following steps: S1, initially monitoring a wall body; s2, wall top supporting is carried out; s3, reinforcing the wall body; s4, reinforcing the foundation; s5, a bent frame column foundation is excavated and reinforced; s6, construction of a newly-added main body structure; step S7, constructing a wall deviation rectifying steel plate beam; s8, the inclined supporting system at the position of the finished layer is dismantled; and S9, door and window openings are constructed. The safety redundancy of a building system formed by a newly-added main body structure and an existing plant structure is fully exerted, an opposite-pulling stress system is formed by the correcting steel plate beams and the inclined anchor bars, the thickness of a reinforcing surface layer can be effectively reduced on the premise that the stability of the wall is ensured, on one hand, the self weight of the wall can be reduced, and the stability of the wall can be ensured; on the other hand, construction materials can be reduced, and the purposes of reducing cost and increasing efficiency are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of reinforcement and reconstruction construction of existing bent frame factory buildings, and in particular to a construction method for adding floors, reinforcing and reconstructing bent frame factory buildings. Background Art

[0002] Old industrial plants usually have a rack structure system. As the years of use increase, the stability of the rack plant itself will deteriorate, making it difficult to meet the needs of safe use, and reinforcement is required. At the same time, with the acceleration of my country's industrialization process, industrial structure adjustments, equipment updates, and production process updates are becoming more frequent, and the functions of existing plants must also adapt to such changes. Changes in the use functions of buildings also require adaptive additions and reinforcement of plant structures.

[0003] In the rack plant system, the outer protective wall of the old industrial plant is a non-load-bearing structure, and there is no effective connection measure with the rack columns. In order to improve safety and increase the number of floors, it is necessary to reinforce and renovate the rack columns and surrounding walls of the rack plant. However, there is no relatively mature process for increasing the number of floors for rack plants in the existing technology. In the actual renovation and construction stage, the designers and constructors mostly refer to the experience of general wall reinforcement and renovation to increase the number of floors of the rack plant, which makes it difficult to achieve the expected control of construction safety, construction efficiency and construction cost.

[0004] In the structure system of the bent-frame factory building, the base of the outer retaining wall is generally located above the foundation of the bent-frame column. During the foundation reinforcement process, the outer retaining wall needs to hollow out the bottom soil or chisel out part of the bottom wall, causing the wall to be suspended. How to support the retaining wall and ensure the lateral stability of the wall is a difficult problem in construction. At the same time, how to give full play to the synergy between the newly built main structure and the existing structure in the process of adding floors to improve the temporary and permanent stability of the retaining wall, ensure construction safety, reduce the cost of wall reinforcement, and improve construction efficiency is also another difficult problem in construction. Summary of the invention

[0005] The purpose of the present invention is to propose a construction method for adding floors, reinforcing and reconstructing a bent frame factory building, so as to solve the technical problems described in the background technology.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: A construction method for adding floors, reinforcing and reconstructing a bent-frame factory building comprises the following steps: Step S1, initial monitoring of the wall, monitoring the verticality of the retaining wall, determining whether the wall is tilted and the tilt direction of the wall, and setting settlement and displacement monitoring points on the wall according to the specification requirements; Step S2: supporting the top of the wall, setting up an oblique support system on both sides of the wall to temporarily support and reinforce the retaining wall; Step S3: wall reinforcement: according to the design drawings, a reinforcement surface layer is provided on the outer facade of the enclosure wall; Step S4: reinforcement of the foundation, according to the geological survey report and the building foundation load requirements, the foundation is reinforced; Step S5, excavating and reinforcing the bent column foundation, reinforcing the bent column foundation by increasing the cross-section, and backfilling the foundation and compacting it layer by layer after the reinforcement is completed; Step S6, constructing the newly added main structure, according to the design drawings, constructing each layer of the newly added main structure from bottom to top, and burying oblique anchor bars simultaneously, the newly added main structure is connected to the retaining wall and the frame column by anchor bars, the oblique anchor bars obliquely penetrate the retaining wall, the bottom end of which is anchored in the newly added main structure, and the top end of which penetrates the retaining wall and extends to the outside of the retaining wall; Step S7, constructing a wall correction steel plate beam, wherein the correction steel plate beam is attached to the outer side of the enclosure wall and fixedly connected to the top of the oblique anchor bar, and the correction steel plate beams at the same floor position are connected as a whole on the outer side of the building; Step S8, dismantling the oblique support system at the completion layer position; Step S9, door and window opening construction, door and window opening construction is carried out on the enclosure wall according to the design drawings.

[0007] Preferably, the oblique support system includes a wall-attached joist, a wall-attached steel plate strip, a supporting crossbeam and an oblique strut. The wall-attached joist and the wall-attached steel plate strip are both horizontally attached to the outer facade of the enclosing wall and fixed to the enclosing wall by tension bolts, and the wall-attached steel plate strip is arranged above the wall-attached joist. The supporting crossbeam is arranged at intervals along the wall-attached joist, one end of which is vertically fixed on the supporting wall joist, and the other end extends to the outside of the enclosing wall and is connected and fixed to a pier foundation set on the floor. The oblique strut is inclined, and its top end is connected and fixed to a connecting ear fixedly arranged on the wall-attached steel plate strip, and its bottom end is connected and fixed to a connecting ear fixedly arranged at the end of the supporting crossbeam.

[0008] Preferably, the oblique support system also includes an oblique cable, which is arranged at an angle and is in a taut state, with its top end connected and fixed to a connecting ear fixedly arranged on the wall-attached steel plate strip, and its bottom end connected and fixed to a connecting ear fixedly arranged at the end of the supporting beam.

[0009] Preferably, the step S2 specifically includes: Step S21, according to the position of the supporting beam, a pier foundation is set at the end of the supporting beam; Step S22, grinding the bottom of the enclosure wall to make it smooth, staggeredly arranging bolt holes on the wall at the grinding position, installing tension bolts in the bolt holes, and filling the holes with anchoring glue; Step S23, after the strength of the anchor glue reaches the design strength requirement, the wall joist is installed; Step S24, installing a supporting crossbeam between the wall-attached joist and the pier base foundation, wherein one end of the supporting crossbeam is connected and fixed to the wall-attached joist, and the other end of the supporting crossbeam is connected and fixed to the pier base foundation at its end position; Step S25, installing wall-attached steel plate strips on both sides of the upper wall of the enclosure wall, wherein the wall-attached steel plate strips are fixed with tension bolts; Step S26, installing the oblique support rods and the oblique cables, and ensuring that the oblique cables are in a taut state.

[0010] Preferably, the reinforced surface layer is a steel mesh mortar surface layer, and the steel mesh of the reinforced surface layer is anchored into the frame column through anchor bars. Within the range of the beams and slabs of the newly added main structure between layers, the mortar surface layer is not applied, but the longitudinal full-length steel bars of the reinforced surface layer steel mesh must be ensured to be continuous and anchored in the beams and slabs.

[0011] Preferably, the step S5 specifically includes: Step S51, excavating the bent column foundation by using an interval skipping method, excavating the soil above the foundation by machinery, and retaining the soil at the bottom of the retaining wall; Step S52, the soil at the bottom of the retaining wall is manually excavated, and the bottom of the wall is temporarily supported by vertical supports; Step S53, pouring a concrete cushion layer and reserving a metal anchor plate; Step S54, installing shear steel according to the design drawing position, wherein the axis direction of the shear steel is perpendicular to the direction of the retaining wall, the bottom of the shear steel is welded and fixed to the metal anchor plate, and the upper surface is horizontal and fixed with a level ruler for monitoring deformation; Step S55, chiseling the original foundation, implanting connecting anchor bars, and installing through-wall and through-column steel bars and wall dowel bars on the upper surface of the foundation after the interface is enlarged; Step S56, installing the foundation formwork, pouring foundation concrete, curing the foundation concrete, removing the foundation formwork and temporary vertical supports at the bottom of the retaining wall; Step S57, backfilling the foundation of the bent columns and compacting it layer by layer; Step S58, repeat steps S51-S57 until the foundation reinforcement of all the frame columns is completed, wherein the adjacent foundation excavation should be carried out after the strength of the adjacent foundations on both sides has reached more than 75% of the design strength after reinforcement and the foundation backfill is completed.

[0012] Preferably, it also includes, Step S10, constructing a wall decoration layer, constructing a wall decoration layer on the outside of the enclosure wall, and adjusting the thickness of the wall decoration layer to ensure that the verticality of the wall meets the requirements of the construction quality acceptance specifications.

[0013] Preferably, in step S3, no reinforcement surface layer is provided on the original enclosing wall within the door and window openings.

[0014] Preferably, the oblique support systems on both sides of the retaining wall are dismantled in two steps. After the foundation reinforcement of the frame columns is completed in step S5, the oblique support system on one side of the retaining wall is dismantled, and the oblique support system on the side with poor stability is retained. In step S8, the oblique support system on the other side of the retaining wall is dismantled.

[0015] Preferably, the surface of the correcting steel plate beam is provided with anti-rust and fire-proof treatment measures.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention gives full play to the safety redundancy of the building system formed by the newly added main structure and the existing plant structure. By forming a tension force system with the deviation-correcting steel plate beam and the oblique anchor bar, the thickness of the reinforced surface layer can be effectively reduced under the premise of ensuring the stability of the wall. On the one hand, it can reduce the dead weight of the wall and ensure the stability of the wall. On the other hand, it can also reduce the construction materials, achieving the purpose of reducing costs and increasing efficiency. 2. The oblique support system of the present invention has a simple structure, convenient construction, easy installation and disassembly, and will not occupy additional construction space. By using tension bolts to fix the wall support beams and the attached steel plate strips on the retaining wall, and further using the attached support beams as the attachment support points of the supporting beams, and using the attached steel plate strips as the attachment support points of the oblique struts and the oblique cables, the problem of reduced safety caused by the need to drill holes in the retaining wall to install shoulder beams is avoided. Moreover, the integrity of the reinforced section of the retaining wall is better, and the top-pull combined support method further improves the support and reinforcement quality of the retaining wall, ensuring the stability of the wall and construction safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or other aspects and advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only exemplary and do not limit the present invention, wherein: Figure 1 It is a schematic structural diagram of the oblique support system of the present invention on one side of the enclosure wall; Figure 2 It is a structural schematic diagram of the oblique support system of the present invention along the cross section of the enclosure wall; Figure 3 It is a schematic diagram of the arrangement of the tension bolts of the oblique support system of the present invention; Figure 4 It is a cross-sectional schematic diagram of the wall-attached joist according to the present invention being fixed by tension bolts; Figure 5 It is a structural schematic diagram of the bent column foundation involved in the present invention, which is reinforced by a method of increasing the cross section; Figure 6 The present invention is a schematic structural diagram of the deviation-correcting steel plate beam.

[0018] Figure numerals: 1. Retaining wall; 2. Frame column; 3. Wall-attached support beam; 4. Tension bolt; 5. Support beam; 6. Connecting ear; 7. Pier foundation; 8. Wall-attached steel plate strip; 9. Oblique strut; 10. Oblique cable; 11. Vertical support; 12. Shear-resistant steel; 13. Reinforced surface layer; 14. New main structure; 15. Corrective steel plate beam; 16. Oblique anchor bars. DETAILED DESCRIPTION

[0019] In the following, an embodiment of a construction method for adding floors, reinforcing and reconstructing a rack factory building of the present invention will be described with reference to the accompanying drawings. The embodiments recorded herein are specific embodiments of the present invention, which are used to illustrate the concept of the present invention. They are all explanatory and exemplary and should not be interpreted as limitations on the embodiments of the present invention and the scope of the present invention. In addition to the embodiments recorded herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and specification of this application, including technical solutions that adopt any obvious replacements and modifications to the embodiments recorded herein.

[0020] In the description of the present invention, it should be noted that the terms "front", "rear", "left", "right", "top", "bottom", "up", "down", "inside", "outside", "horizontal", "vertical", "upright", "oblique", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc., are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0021] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the present invention and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structures of various components of the embodiments of the present invention, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0022] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. Figure 1-6 , the preferred embodiments of the present invention are further described in detail: As described in the background technology, the outer retaining wall 1 of the old industrial plant is a non-load-bearing structure and has no effective connection measures with the bent columns 2. The base of the outer retaining wall 1 is generally located above the foundation of the bent columns 2. During the foundation reinforcement process, the outer retaining wall 1 needs to hollow out the bottom earth or chisel out part of the bottom wall, causing the wall to be suspended. How to support the retaining wall 1 and ensure the lateral stability of the wall is a difficult problem in construction.

[0023] The traditional construction method is divided into two steps for unloading and supporting: Wall unloading: In order to ensure the stability of the masonry wall, a through-wall I-beam is set perpendicular to the wall as a shoulder beam, and steel beams and jacks are required as unloading supports. Wall support: Full-height scaffolding is set on both sides of the wall, and the wall is supported.

[0024] However, the traditional construction technology has the following disadvantages: the construction process is complicated, the workload is large, and the construction period is long; the positions of I-beams, scaffolding and reinforced foundations often conflict, causing inconvenience in construction; the parts where I-beams pass through the wall need to be filled with cement mortar, which is difficult to remove in the later stage and is not convenient for the turnover of I-beams; in the process of installing I-beams, it is necessary to first drill a hole in the wall, which causes great damage to the original structure, the wall is prone to overturning, and the construction risk is relatively high.

[0025] For this reason, Figure 1-4 As shown, a diagonal support system preferably designed in the present invention comprises a wall-attached joist 3, a wall-attached steel plate belt 8, a supporting beam 5 and a diagonal brace 9. The wall-attached joist 3 and the wall-attached steel plate belt 8 are both horizontally attached to the outer facade of the enclosure wall 1 and fixed to the enclosure wall 1 by tension bolts 4, and the wall-attached steel plate belt 8 is arranged above the wall-attached joist 3. Figure 3-4 As shown, the tension bolts 4 are distributed in an alternating manner along the extension direction of the wall-attached joist 3 or the wall-attached steel plate belt 8, the supporting crossbeam 5 is arranged at intervals along the wall-attached joist 3, one end of which is vertically fixed on the supporting wall-attached joist 3, and the other end extends to the outside of the enclosure wall 1 and is connected and fixed to the pier foundation 7 set on the floor, the oblique strut 9 is arranged obliquely, the top end of which is connected and fixed to the connecting ear 6 fixedly set on the wall-attached steel plate belt 8, and the bottom end of which is connected and fixed to the connecting ear 6 fixedly set at the end of the supporting crossbeam 5; Among them, the wall-attached support beam 3, the wall-attached steel plate belt 8, the supporting beam 5 and the oblique support rod 9 can be arranged according to the actual reinforcement requirements of the wall and the construction conditions (such as whether the wall is inclined, the inclination direction of the wall, whether there are obstructions on both sides of the wall, etc.), for example, the arrangement of the supporting beam 5 on both sides of the enclosure wall 1 can be symmetrical or staggered; Moreover, the wall-attached joist 3 and the wall-attached steel plate belt 8 are fixed to the enclosure wall 1 by the tension bolts 4, and there is no need to open a large hole in the enclosure wall 1. Figure 1 As shown, the layout range of the wall joists 3 and the wall steel strips 8 needs to continuously cover the wall of at least one column spacing outside the rack column 2 at the excavation position. At this time, the wall of the excavation section is subjected to the force as a whole through the wall joists 3 and the wall steel strips 8, and the integrity is better; In order to further improve the reinforcement effect of the excavation section retaining wall 1, an oblique cable 10 is also added. The oblique cable 10 is tilted and in a taut state. The top end is connected and fixed to the connecting ear 6 fixedly arranged on the wall-attached steel plate belt 8, and the bottom end is connected and fixed to the connecting ear 6 fixedly arranged at the end of the supporting beam 5. The oblique cable 10 can be made of steel wire rope or steel bar. The taut oblique cable 10 can construct prestress in the triangular structure formed by the retaining wall 1, the supporting beam 5 and the oblique support rod 9, so that the entire oblique support system is more stable. On this basis, facing the bent factory building structure that needs to be renovated by adding floors, the present invention preferably provides a bent factory building layer adding reinforcement renovation construction method, which includes the following steps: Step S1, initial monitoring of the wall, monitoring the verticality of the retaining wall 1, determining whether the wall is tilted and the tilt direction of the wall, and setting settlement and displacement monitoring points on the wall according to the specification requirements; Step S2, wall support, set up oblique support systems on both sides of the wall to temporarily support and reinforce the retaining wall 1. According to the height of the wall, set up oblique support systems in the middle and lower parts of the wall (the support distance is generally 3-4m). Of course, the number of support layers of the oblique support system can be adaptively increased according to the height of the wall and the initial stability of the wall.

[0026] The step S2 specifically includes: Step S21, according to the position of the supporting beam 5, a concrete pier foundation 7 is set at the end, and a steel plate is pre-buried on the top of the pier foundation 7. The pier foundation 7 can be poured with concrete alone (the top surface should be lower than the surface layer of the indoor first floor structure), or a newly added ground beam or hardened site can be used according to the structural design; Step S22, grinding the bottom of the enclosure wall 1 to make it smooth, so as to ensure that the channel steel wall joist 3 can be in close contact with the wall surface, and staggeredly arranging bolt holes on the wall at the grinding position, installing tension bolts 4 in the bolt holes, and filling the holes with anchoring glue; Step S23, after the strength of the anchor glue reaches the design strength requirement, the channel steel wall joist 3 is installed; Step S24, welding a connecting plate on the channel steel wall joist 3, installing the supporting beam 5, one end of the supporting beam 5 is bolted to the connecting plate of the wall joist 3, and the other end is connected and fixed to the buried plate on the top of the end concrete pier foundation 7; Step S25, using a machine such as a lift to install the wall-attached steel plate strips 8 on both sides of the upper part of the wall, and the wall-attached steel plate strips 8 are fixed by staggered tension bolts 4; Step S26, using a truck crane in conjunction with a lifter, installing the oblique support rod 9 and the oblique cable 10, and ensuring that the oblique cable 10 is in a taut state; Step S3, wall reinforcement, according to the design drawings, a reinforcement surface layer 13 is set on the outer facade of the enclosure wall 1, and the reinforcement surface layer 13 is a steel mesh mortar surface layer, which can be set on one side or both sides of the wall according to the design drawings, and the steel mesh of the reinforcement surface layer 13 is anchored into the frame column 2 through anchor bars. In the range of the beam and slab of the newly added main structure 14 between layers, the mortar surface layer is not applied, but the longitudinal full-length steel bars of the reinforcement surface layer 13 steel mesh need to be ensured to be continuous and anchored in the beam and slab, and in the conflicting parts such as the attached wall steel plate belt 8 and the attached wall joist 3, the longitudinal full-length steel bars of the reinforcement surface layer 13 steel mesh need to be subjected to back-throwing treatment, and after the structure of the conflicting part is demolished, the back-throwing steel bars are connected and reinforced and the mortar surface layer is applied. Since the wall at the door and window openings needs to be demolished, in order to avoid material waste, the reinforcement surface layer 13 is not set at the wall of the original enclosure wall 1 within the door and window openings; Step S4, foundation reinforcement, according to the geological survey report and the building foundation load requirements, adopt a suitable foundation treatment plan to reinforce the foundation, wherein the selection principle of the foundation treatment plan is as follows: 1. The natural foundation can meet the bearing capacity requirements, so it is recommended to use the natural foundation; 2. When the site is ready for replacement, it is recommended to use lime soil or graded sand and gravel for replacement; 3. When the site does not have the conditions for replacement, it is recommended to use grouting steel pipe pile composite foundation for foundation treatment. The treatment depth and treatment range (expanded according to the requirements of the specification) should be determined according to the foundation soil conditions of the building, engineering requirements and equipment; Step S5, excavation and reinforcement of the foundation of the bent column 2, such as Figure 5 As shown, the foundation of the bent column 2 is reinforced by increasing the cross-section. After the reinforcement is completed, the foundation is backfilled and compacted layer by layer. The specific steps include: Step S51, excavating the foundation of the bent column 2 by means of interval skipping, excavating the soil above the foundation by machinery, and retaining the soil at the bottom of the retaining wall 1; Step S52, the soil at the bottom of the retaining wall 1 is manually excavated, and the bottom of the wall is temporarily supported by using materials such as wood, adjustable U-supports, and steel pads as vertical supports 11. The vertical supports 11 are arranged at intervals below the retaining wall 1 at the excavation position, with the bottom ends thereof resting on the soil at the excavation surface, and the top ends thereof resting on the bottom end surface of the retaining wall 1. The vertical supports 11 are used to support and unload the excavation section wall, thereby further improving the stability of the wall. Step S53, pouring a concrete cushion layer and reserving a metal anchor plate; Step S54, install the shear steel 12 according to the design drawing position, the axis direction of the shear steel 12 is perpendicular to the wall direction of the enclosure wall 1, the bottom of the shear steel 12 is welded and fixed to the metal anchor plate, and the upper surface is horizontal and fixed with a level ruler for monitoring deformation; Step S55, chiseling the original foundation, implanting connecting anchor bars, and installing through-wall and through-column steel bars and wall dowel bars on the upper surface of the foundation after the interface is enlarged; Step S56, installing the foundation formwork, pouring foundation concrete, curing the foundation concrete, removing the foundation formwork and the temporary vertical support 11 at the bottom of the retaining wall 1; Step S57, backfill soil is constructed for the foundation of the bent column 2, and the soil is compacted layer by layer; Step S58, repeating steps S51 to S57 until the foundation reinforcement of all bent columns 2 is completed, wherein the adjacent foundation excavation should be carried out after the strength of the adjacent foundations on both sides reaches more than 75% of the design strength after reinforcement and the foundation backfill is completed; Step S6, constructing the newly added main structure 14. According to the design drawings, construct the newly added main structure 14 (ground beam, frame beam, structural floor slab, etc.) of each layer from bottom to top in sequence, and simultaneously bury the oblique anchor bars 16. The newly added main structure 14 is connected to the enclosure wall 1 and the bent column 2 by anchor bars. The oblique anchor bars 16 obliquely penetrate the enclosure wall 1, and the bottom end thereof is anchored in the newly added main structure 14, and the top end thereof penetrates the enclosure wall 1 and extends to the outside of the enclosure wall 1. Since the oblique anchor bars 16 need to be buried synchronously, it is necessary to drill oblique holes in the wall in advance and pre-bury the oblique anchor bars before pouring the beam and slab concrete. Step S7, construct the wall correction steel plate beam 15, such as Figure 6 As shown, the correcting steel plate beam 15 is attached to the outside of the enclosure wall 1 and fixedly connected to the top of the oblique anchor bar 16, and the correcting steel plate beams 15 at the same floor position are connected as a whole on the outside of the building. The load of the enclosure wall 1 is unloaded to the newly added main structure 14 through the correcting steel plate beam 15 and the oblique anchor bar 16 to avoid the process of thickening and reinforcing the surface layer 13. The specific steps are as follows: Step S71, the inclined hole of the oblique anchor bar 16 is filled with anchor glue; Step S72, the deflection-correcting steel plate beam 15 passes through the oblique anchor bar 16, the steel plates of the deflection-correcting steel plate beam 15 are installed in blocks, and are attached to the wall surface with high-strength polymer mortar; Step S73, welding the steel plate sections to form a whole; Step S74, cutting off the redundant oblique anchor bars 16 beyond the end of the steel plate; Step S75, plug welding the oblique anchor bar 16 to the steel plate; Step S76, the surface of the steel plate is treated with rust and fire prevention.

[0027] Step S8, when the construction of the corrective steel plate beam 15 on the outside of the wall is completed and the anchor bar planting reaches the design strength (usually, the newly added main structure 14 is poured about five to seven days and the concrete strength reaches 70%-80% of the design strength), all the oblique support systems at the completion layer position can be removed. Of course, the oblique support systems can be removed all at once in this step to provide sufficient safety redundancy. However, since the reinforcement process of the reinforced surface layer 13 and the foundation reinforcement process of the bent column 2 has been completed during the construction of the newly added main structure 14 in step S6, the removal process of the oblique support systems on both sides of the retaining wall 1 can also be intervened in advance and removed in two times. When removed in two times, after the foundation reinforcement of the bent column 2 is completed in step S5, the oblique support system on one side of the retaining wall 1 is removed, and the oblique support system on the side with poor stability is retained (in the case of an inclined wall, the oblique support system on one side of the inclined direction needs to be retained during the first removal, and the other side is removed for turnover use to reduce material investment costs). When the construction reaches this step (step S8), the oblique support system on the other side of the retaining wall 1 can continue to be removed; Step S9, construction of door and window openings: according to the design drawings, construction of door and window openings is performed on the enclosure wall 1. The specific steps are as follows: Step S91, first draw the lines and reserve the dimensions of the lintel, frame, etc.; Step S92, first use a water saw to cut the wall within the door and window openings into blocks, and then manually use a pneumatic pick or other tool to break the enclosure wall 1; Step S93, tying the steel bars at the door and window openings, setting up formwork, pouring concrete, curing, and removing the formwork; Step S10, construction of the wall decoration layer, constructing the wall decoration layer on the outside of the enclosure wall 1, and adjusting the thickness of the wall decoration layer (such as the insulation layer, etc.) to ensure that the verticality of the wall meets the requirements of the construction quality acceptance specifications. This step can be omitted when there is no facade appearance acceptance requirement.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for adding floors and reinforcing and reconstructing a bent factory building, characterized in that: The steps include: Step S1, initial monitoring of the wall, monitoring the verticality of the retaining wall (1), determining whether the wall is tilted and the direction of the wall tilt, and setting settlement and displacement monitoring points on the wall in accordance with the requirements of the specification; Step S2: supporting the top of the wall, setting up an oblique support system on both sides of the wall to temporarily support and reinforce the retaining wall (1); Step S3, wall reinforcement, according to the design drawings, a reinforcement surface layer (13) is provided on the outer facade of the enclosure wall (1); Step S4: reinforcement of the foundation, according to the geological survey report and the building foundation load requirements, the foundation is reinforced; Step S5, excavating and reinforcing the foundation of the bent column (2), reinforcing the foundation of the bent column (2) by increasing the cross-section, and after the reinforcement is completed, backfilling the foundation and compacting it layer by layer; Step S6, constructing the newly added main structure (14), according to the design drawings, sequentially constructing each layer of the newly added main structure (14) from bottom to top, and simultaneously burying the oblique anchor bars (16), wherein the newly added main structure (14) is connected to the retaining wall (1) and the bent column (2) by anchor bars, wherein the oblique anchor bars (16) obliquely penetrate the retaining wall (1), wherein the bottom end thereof is anchored in the newly added main structure (14), and the top end thereof penetrates the retaining wall (1) and extends to the outside of the retaining wall (1); Step S7, constructing a wall deflection-correcting steel plate beam (15), wherein the deflection-correcting steel plate beam (15) is attached to the outer side of the enclosure wall (1) and fixedly connected to the top of the oblique anchor bar (16), and the deflection-correcting steel plate beams (15) at the same floor position are connected as a whole on the outer side of the building; Step S8, dismantling the oblique support system at the completed layer position; Step S9, construction of door and window openings: construction of door and window openings on the retaining wall (1) according to the design drawings.

2. A method for reinforcing and renovating a bent factory building according to claim 1, characterized in that: The oblique support system comprises a wall-attached support beam (3), a wall-attached steel plate strip (8), a supporting crossbeam (5) and an oblique support rod (9). The wall-attached support beam (3) and the wall-attached steel plate strip (8) are both horizontally attached to the outer surface of the enclosure wall (1) and fixed to the enclosure wall (1) by tension bolts (4). The wall-attached steel plate strip (8) is arranged above the wall-attached support beam (3). The supporting crossbeam (5) is arranged at intervals along the wall-attached support beam (3). One end of the supporting crossbeam (5) is vertically fixed to the supporting wall support beam (3), and the other end extends to the outside of the enclosure wall (1) and is connected and fixed to a pier base (7) arranged on the floor. The oblique support rod (9) is arranged obliquely, and its top end is connected and fixed to a connecting ear (6) fixedly arranged on the wall-attached steel plate strip (8), and its bottom end is connected and fixed to a connecting ear (6) fixedly arranged at the end of the supporting crossbeam (5).

3. A construction method for adding floors and reinforcing and renovating a bent factory building according to claim 2, characterized in that: The oblique support system also includes an oblique cable (10), which is arranged obliquely and is in a taut state, and its top end is connected and fixed to a connecting ear (6) fixedly arranged on the wall-attached steel plate strip (8), and its bottom end is connected and fixed to a connecting ear (6) fixedly arranged at the end of the supporting crossbeam (5).

4. A method for reinforcing and renovating a bent factory building according to claim 3, characterized in that: The step S2 specifically includes: Step S21, according to the position of the supporting beam (5), a pier foundation (7) is provided at the end of the supporting beam (5); Step S22, grinding the bottom of the enclosure wall (1) to make it smooth, and staggeredly arranging bolt holes on the wall at the grinding position, installing tension bolts (4) in the bolt holes, and filling the holes with anchoring glue; Step S23, after the strength of the anchor glue reaches the design strength requirement, the wall joist (3) is installed; Step S24, installing a supporting crossbeam (5) between the wall-attached joist (3) and the pier base (7), wherein one end of the supporting crossbeam (5) is connected and fixed to the wall-attached joist (3), and the other end is connected and fixed to the pier base (7) at its end position; Step S25, installing wall-attached steel plate strips (8) on both sides of the upper wall of the enclosure wall (1), wherein the wall-attached steel plate strips (8) are fixed by tension bolts (4); Step S26, installing the oblique support rod (9) and the oblique cable (10), and ensuring that the oblique cable (10) is in a taut state.

5. The method for reinforcing and renovating a bent factory building according to claim 1 is characterized by: The reinforcement surface layer (13) is a steel mesh mortar surface layer. The steel mesh of the reinforcement surface layer (13) is anchored into the frame column (2) through anchor bars. Within the range of the beam and slab of the newly added main structure (14) between layers, no mortar surface layer is applied. However, the longitudinal full-length steel bars of the steel mesh of the reinforcement surface layer (13) must be ensured to be continuous and anchored in the beam and slab.

6. The method for reinforcing and renovating a bent factory building according to claim 1 is characterized by: The step S5 specifically includes: Step S51, excavating the foundation of the bent column (2) by using an interval skipping excavation method, excavating the soil above the foundation by machinery, and retaining the soil at the bottom of the retaining wall (1); Step S52, the soil at the bottom of the retaining wall (1) is manually excavated, and the bottom of the wall is temporarily supported by vertical supports (11); Step S53, pouring a concrete cushion layer and reserving a metal anchor plate; Step S54, installing the shear-resistant steel (12) according to the position of the design drawing, wherein the axial direction of the shear-resistant steel (12) is perpendicular to the wall direction of the enclosure wall (1), the bottom of the shear-resistant steel (12) is welded and fixed to the metal anchor plate, and the upper surface is horizontal and fixedly mounted with a level ruler for monitoring deformation; Step S55, chiseling the original foundation, implanting connecting anchor bars, and installing through-wall and through-column steel bars and wall dowel bars on the upper surface of the foundation after the interface is enlarged; Step S56, installing the foundation formwork, pouring foundation concrete, curing the foundation concrete, removing the foundation formwork and the temporary vertical support (11) at the bottom of the retaining wall (1); Step S57, backfill soil is constructed for the foundation of the bent column (2), and the soil is compacted layer by layer; Step S58, repeating steps S51 to S57 until the foundation reinforcement of all the frame columns (2) is completed, wherein the adjacent foundation excavation should be carried out after the strength of the adjacent foundations on both sides reaches more than 75% of the design strength after reinforcement and the foundation backfill is completed.

7. The method for reinforcing and renovating a bent factory building according to claim 1 is characterized by: Also includes, Step S10, construction of the wall decoration layer, construction of the wall decoration layer on the outer side of the enclosure wall (1), and adjustment of the thickness of the wall decoration layer to ensure that the verticality of the wall meets the requirements of the construction quality acceptance specification.

8. The method for reinforcing and renovating a bent factory building according to claim 1 is characterized by: In the step S3, no reinforcement surface layer (13) is provided on the wall of the original enclosure wall (1) within the range of the door and window openings.

9. The method for reinforcing and renovating a bent factory building according to claim 1 is characterized by: The oblique support systems on both sides of the retaining wall (1) are removed in two steps. After the foundation reinforcement of the frame column (2) is completed in step S5, the oblique support system on one side of the retaining wall (1) is removed, and the oblique support system on the side with poor stability is retained. In step S8, the oblique support system on the other side of the retaining wall (1) is removed.

10. The method for reinforcing and renovating a bent factory building according to claim 1 is characterized by: The surface of the deviation-correcting steel plate beam (15) is provided with anti-rust and fire-proof treatment measures.

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