A method for reinforcing and reconstructing a row frame factory by adding layers

Abstract

The application discloses a kind of row frame plant reinforcing reconstruction construction methods of layer increase, comprising, step S1, wall initial monitoring;Step S2, wall roof support;Step S3, wall reinforcement;Step S4, foundation reinforcement;Step S5, row frame column foundation excavation and reinforcement;Step S6, new main structure construction;Step S7, construction wall deviation rectification steel plate beam;Step S8, remove the diagonal support system of completion layer position;Step S9, door and window hole construction.The application gives full play to the safety redundancy of the building system formed by new main structure and existing plant structure, forms a tensioning force system with deviation rectification steel plate beam and diagonal anchor bar, can effectively reduce the thickness of reinforcement surface layer under the premise of ensuring wall stability, on the one hand can reduce wall self weight, ensure wall stability, on the other hand can also reduce construction material, achieve the purpose of cost reduction and efficiency increase.

Description

Technical Field

[0001] The present 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 typically feature a bent-frame structure. As they age, their inherent stability deteriorates, making them less safe and requiring reinforcement. Furthermore, with the acceleration of my country's industrialization, adjustments to industrial structure, equipment upgrades, and production process updates are becoming increasingly frequent. Existing plant functions must adapt to these changes, and these shifts in building usage also require adaptive floor additions and reinforcement.

[0003] In the rack-type factory building system, the outer protective walls of old industrial buildings are non-load-bearing structures and have no effective connection measures with the rack columns. In order to improve safety and increase the number of floors, the rack columns and surrounding walls of the rack-type factory buildings need to be reinforced and renovated. However, there is no relatively mature floor-adding and renovation process for rack-type factory buildings in the existing technology. During the actual renovation and construction phase, designers and construction parties often refer to the experience of general wall reinforcement and renovation to increase the number of floors of rack-type factory buildings, which makes it difficult to achieve the expected control of construction safety, construction efficiency and construction costs.

[0004] In a bent-frame factory building structure, the base of the exterior retaining wall is typically located above the bent-frame column foundation. During foundation reinforcement, the exterior retaining wall requires excavation or the removal of part of the wall, leaving it suspended in the air. Supporting the retaining wall to ensure its lateral stability is a major construction challenge. Furthermore, leveraging the synergy between the newly constructed main structure and the existing structure during the floor-addition process to enhance the temporary and permanent stability of the retaining wall, ensure construction safety, reduce wall reinforcement costs, and improve efficiency is another significant construction challenge. Summary of the Invention

[0005] The purpose of the present invention is to propose a construction method for adding floors, reinforcing and renovating a bent factory building 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:

[0007] A construction method for adding floors, reinforcing and renovating a bent factory building comprises the following steps:

[0008] Step S1: Initial wall monitoring: monitoring the verticality of the retaining wall to determine 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 specifications;

[0009] Step S2, wall body supporting, setting inclined support system on both sides of the wall body to temporarily support and reinforce the enclosure wall;

[0010] Step S3, wall body reinforcement, setting reinforcement surface layer on the outer facade of the enclosure wall according to the design drawing;

[0011] Step S4, foundation reinforcement, reinforcing the foundation according to the geological survey report and the building foundation load requirement;

[0012] Step S5, bent column foundation excavation and reinforcement, reinforcing the bent column foundation by increasing the section, and after the reinforcement is completed, backfilling the foundation and compacting by layering and rolling;

[0013] Step S6, new main structure construction, sequentially constructing each layer of new main structure from bottom to top according to the design drawing, and synchronously embedding inclined anchor bars, the new main structure being connected with the enclosure wall and the bent column by anchor bars, the inclined anchor bars being inclined and penetrating through the enclosure wall, the bottom end being anchored into the new main structure, and the top end extending to the outside of the enclosure wall;

[0014] Step S7, construction of wall body deviation correction steel plate beam, the deviation correction steel plate beam being fixedly connected with the inclined anchor bar top end on the outside of the enclosure wall, and the deviation correction steel plate beams at the same layer position being connected as a whole on the outside of the building;

[0015] Step S8, removing the inclined support system at the completed layer position;

[0016] Step S9, door and window hole construction, constructing the door and window hole on the enclosure wall according to the design drawing.

[0017] Preferably, the inclined support system comprises wall-attached joists, wall-attached steel plate belts, support cross beams and inclined struts, the wall-attached joists and the wall-attached steel plate belts are both attached on the outer facade of the enclosure wall along the horizontal direction and are fixed on the enclosure wall by tension bolts, the wall-attached steel plate belts are arranged above the wall-attached joists, the support cross beams are arranged at intervals along the wall-attached joists, one end of each support cross beam is fixed vertically on the wall-attached joist, the other end extends to the outside of the enclosure wall and is fixedly connected with the pier foundation arranged on the ground floor, and the inclined struts are arranged obliquely, the top end of each inclined strut is fixedly connected with the connecting lug fixed on the wall-attached steel plate belt, and the bottom end is fixedly connected with the connecting lug fixed at the end of the support cross beam.

[0018] Preferably, the inclined support system further comprises inclined cables, the inclined cables are arranged obliquely and are in a taut state, the top end of each inclined cable is fixedly connected with the connecting lug fixed on the wall-attached steel plate belt, and the bottom end is fixedly connected with the connecting lug fixed at the end of the support cross beam.

[0019] Preferably, the step S2 specifically comprises,

[0020] Step S21, according to the position of the support beam, a pier foundation is arranged at the end of the support beam;

[0021] Step S22, the bottom of the enclosure wall is polished flat, bolt holes are arranged on the wall at the polishing position, tension bolts are installed in the bolt holes, and the holes are filled with anchoring glue;

[0022] Step S23, after the strength of the anchoring glue reaches the design strength requirement, the wall-attached beam is installed;

[0023] Step S24, a support beam is installed between the wall-attached beam and the pier foundation, one end of the support beam is connected and fixed with the wall-attached beam, and the other end is connected and fixed with the pier foundation at the end position;

[0024] Step S25, wall-attached steel plate belts are installed on the two side walls of the upper part of the enclosure wall, and the wall-attached steel plate belts are fixed by tension bolts;

[0025] Step S26, diagonal struts and diagonal cables are installed, and it is ensured that the diagonal cables are in a taut state.

[0026] Preferably, the reinforcing surface layer is a reinforced mesh mortar surface layer, the reinforced mesh of the reinforcing surface layer is anchored into the bent frame column through anchor bars, and in the range of the beam plate of the newly added main structure between layers, no mortar surface layer is daubed, but the longitudinal through steel bars of the reinforcing surface layer steel mesh need to be ensured to be continuous and anchored in the beam plate.

[0027] Preferably, the step S5 specifically includes,

[0028] Step S51, the bent frame column foundation is excavated in a spaced interval and jump digging manner, the upper part of the foundation is excavated by a machine, and the soil at the bottom of the enclosure wall is reserved;

[0029] Step S52, the soil at the bottom of the enclosure wall is manually dug out, and the bottom of the wall is temporarily supported by vertical supports;

[0030] Step S53, a concrete cushion is poured, and a metal anchor plate is reserved;

[0031] Step S54, according to the position of the design drawing, a shear steel is installed, the axis direction of the shear steel is perpendicular to the direction of the enclosure wall, the bottom of the shear steel is welded and fixed with the metal anchor plate, and a water level gauge for monitoring deformation is horizontally and fixedly installed on the upper surface of the shear steel;

[0032] Step S55, the original foundation is chiseled, a connecting anchor bar is implanted, and through-wall and through-column steel bars and wall dowels are installed at the surface position of the foundation after the interface is increased;

[0033] Step S56, a foundation formwork is installed, foundation concrete is poured, the foundation concrete is cured, the foundation formwork and the temporary vertical support at the bottom of the enclosure wall are removed;

[0034] Step S57, backfilling of the row frame column foundation is constructed, and is compacted in layers;

[0035] Step S58, repeating steps S51-S57 until all row frame column foundations are reinforced, wherein adjacent foundation excavations should be performed after the strength of the adjacent foundations on both sides reaches more than 75% of the design strength, and after the foundation backfilling is completed.

[0036] Preferably, it further comprises,

[0037] Step S10, wall decoration layer construction, a wall decoration layer is constructed on the outside of the enclosing wall, and the wall perpendicularity is ensured to meet the requirements of the construction quality acceptance specification by adjusting the thickness of the wall decoration layer.

[0038] Preferably, in step S3, no reinforcing surface layer is arranged at the original enclosing wall body in the door and window opening range.

[0039] Preferably, the diagonal support system on both sides of the enclosing wall is removed twice, after the row frame column foundation reinforcement is completed in step S5, the diagonal support system on one side of the enclosing wall is removed, and the diagonal support system on the side with poor stability is retained, and the diagonal support system on the other side of the enclosing wall is removed in step S8.

[0040] Preferably, the surface of the deviation rectification steel plate beam is provided with rust prevention and fire prevention treatment measures.

[0041] Compared with the prior art, the beneficial effects of the present application are:

[0042] 1. The present application fully utilizes the safety redundancy of the building system formed by the newly added main structure and the existing plant structure, forms a counter-tension force system with the deviation rectification steel plate beam and the diagonal anchor, can effectively reduce the thickness of the reinforcing surface layer under the premise of ensuring the stability of the wall, on the one hand can reduce the self-weight of the wall, ensure the stability of the wall, on the other hand can also reduce the construction materials, achieve the purpose of reducing cost and increasing efficiency;

[0043] 2. The diagonal support system structure of the present application is simple, convenient to construct, easy to install and remove, and will not occupy additional construction space, by using the counter-tension bolt to fix the attached wall joist and the attached steel plate belt on the enclosing wall, and further using the attached joist as the attached support point of the support cross beam, and using the attached steel plate belt as the attached support point of the diagonal support rod and the diagonal cable, the problem of reduced safety caused by the need to open holes in the enclosing wall to set the flat beam is avoided, moreover, the integrity of the reinforced segment of the enclosing wall is better, and the top-pull combined support mode further improves the support and reinforcement quality of the enclosing wall, ensures the stability of the wall and the construction safety. BRIEF DESCRIPTION OF DRAWINGS

[0044] The above and / or other aspects and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:

[0045] Figure 1 Structure diagram of the present application's diagonal bracing system on one side of the enclosure wall;

[0046] Figure 2 Structure diagram of the present application's diagonal bracing system along the cross section of the enclosure wall;

[0047] Figure 3 Structure diagram of the present application's arrangement of the tie bolt;

[0048] Figure 4 Structure diagram of the present application's cross section of the wall-attached beam fixed by the tie bolt;

[0049] Figure 5 Structure diagram of the present application's bent column foundation reinforced by the method of increasing the cross section;

[0050] Figure 6 Structure diagram of the present application's deviation-correcting steel plate beam.

[0051] Reference signs: 1, enclosure wall; 2, bent column; 3, wall-attached beam; 4, tie bolt; 5, support beam; 6, connecting lug; 7, pier foundation; 8, wall-attached steel plate; 9, diagonal bracing rod; 10, diagonal cable; 11, vertical bracing; 12, shear-shaped steel; 13, reinforced surface layer; 14, newly-added main structure; 15, deviation-correcting steel plate beam; 16, diagonal anchoring reinforcement. DETAILED DESCRIPTION

[0052] Hereinafter, an embodiment of a method for reinforcing and reconstructing a bent factory building according to the present application will be described with reference to the accompanying drawings. The embodiment described herein is a specific, concrete embodiment of the present application for explaining the idea of the present application, and is all explanatory and illustrative, and should not be construed as limiting the embodiments of the present application and the scope of the present application. In addition to the embodiment described herein, those skilled in the art can employ other technical solutions that are obvious based on the contents disclosed in the claims and the specification of the present application, which include technical solutions that make any obvious substitution and modification to the embodiment described herein.

[0053] In the description of the present application, it should be noted that the terms "front", "back", "left", "right", "top", "bottom", "upper", "lower", "inner", "outer", "horizontal", "vertical", "vertical", "inclined" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] The drawings of the present specification are schematic drawings that assist in explaining the concept of the present application and schematically represent the shape of each part and its mutual relationship. Please note that in order to clearly show the structure of each component of the embodiments of the present application, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0055] The principles and features of the present application are described below in conjunction with the drawings, and the examples are only used to explain the present application and not to limit the scope of the present application. The preferred embodiments of the present application are described below in conjunction with the drawings. Figures 1-6 The preferred embodiments of the present application are described in further detail:

[0056] As described in the background art, the outer envelope wall 1 of the old industrial plant is a non-load-bearing structure and has no effective connection measures with the bent column 2. The base of the outer envelope wall 1 is generally located above the foundation of the bent column 2. During the process of foundation reinforcement, the outer envelope wall 1 needs to excavate the bottom soil or chisel part of the bottom wall, causing the wall to be in a suspended state. How to support the envelope wall 1 and ensure the lateral stability of the wall is a difficult problem in construction.

[0057] The traditional construction method is carried out in two steps of unloading and supporting: wall unloading: in order to ensure the stability of the masonry wall, a wall-penetrating H-shaped steel is arranged as a carrying beam in the direction perpendicular to the wall, and a steel beam and a jack are used as unloading support. Wall support: full-frame scaffolding is erected on both sides of the wall, and the wall is supported.

[0058] However, the traditional construction process has the following disadvantages: complex construction process, large workload, long construction period; the positions of the H-shaped steel, the scaffolding and the reinforced foundation often conflict, causing inconvenience in construction; the wall-penetrating part of the H-shaped steel needs to be filled with cement mortar, which is difficult to remove in the later period and is not convenient for the turnover use of the H-shaped steel; during the installation of the H-shaped steel, a hole needs to be first cut in the wall, which greatly damages the original structure and the wall is prone to overturning, resulting in a high construction risk.

[0059] Therefore, as Figures 1-4As shown in the drawings, the preferred design of the present application is a diagonal support system, which comprises a wall-attached beam 3, a wall-attached steel strip 8, a support beam 5 and a diagonal strut 9. The wall-attached beam 3 and the wall-attached steel strip 8 are attached to the outer facade of the retaining wall 1 in the horizontal direction and are fixed to the retaining wall 1 by means of a tension bolt 4. The wall-attached steel strip 8 is arranged above the wall-attached beam 3, as shown in Figures 3-4 As shown in the drawings, the tension bolts 4 are arranged alternately in the extension direction of the wall-attached beam 3 or the wall-attached steel strip 8. The support beam 5 is arranged at intervals along the wall-attached beam 3, with one end fixed perpendicularly to the wall-attached beam 3 and the other end extending to the outside of the retaining wall 1 and connected to the pier foundation 7 arranged on the ground. The diagonal strut 9 is arranged obliquely, with the top end connected to the connecting lug 6 fixed to the wall-attached steel strip 8 and the bottom end connected to the connecting lug 6 fixed to the end of the support beam 5.

[0060] The wall-attached beam 3, the wall-attached steel strip 8, the support beam 5 and the diagonal strut 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 direction of the wall inclination, whether there are obstructions on both sides of the wall, etc.). For example, the support beam 5 can be arranged symmetrically on both sides of the retaining wall 1 or staggered.

[0061] Moreover, the wall-attached beam 3 and the wall-attached steel strip 8 are fixed to the retaining wall 1 by means of the tension bolt 4, without the need to open a larger hole in the retaining wall 1. As shown in Figure 1 The arrangement range of the wall-attached beam 3 and the wall-attached steel strip 8 needs to continuously cover at least one column spacing of the wall outside the bent frame column 2 at the excavation position. At this time, the wall at the excavation section is subjected to overall stress by the wall-attached beam 3 and the wall-attached steel strip 8, and the overall integrity is better.

[0062] In order to further improve the reinforcement effect of the retaining wall 1 at the excavation section, a diagonal cable 10 is additionally arranged. The diagonal cable 10 is arranged obliquely and in a taut state, with the top end connected to the connecting lug 6 fixed to the wall-attached steel strip 8 and the bottom end connected to the connecting lug 6 fixed to the end of the support beam 5. The diagonal cable 10 can be made of steel wire or steel bar. The taut diagonal cable 10 can generate prestress in the triangular structure formed by the retaining wall 1, the support beam 5 and the diagonal strut 9, so that the entire diagonal support system is more stable.

[0063] On this basis, in the face of the bent frame factory building structure that needs to be reconstructed by adding layers, the preferred method for reinforcing and reconstructing the bent frame factory building by adding layers comprises the following steps:

[0064] Step S1: initial monitoring of the wall, verticality monitoring of the retaining wall 1 is performed to determine whether the wall is inclined and the direction of the wall inclination, and settlement and displacement monitoring points are arranged on the wall according to the requirements of the specification.

[0065] Step S2, wall body top support, set up inclined support system on both sides of the wall body to temporarily support and reinforce the enclosure wall 1, according to the height of the wall, set up inclined support system (support interval is generally 3-4m) in the middle and lower part of the wall, of course, the number of layers of inclined support system can be increased adaptively according to the height of the wall and the initial stability of the wall.

[0066] The step S2 specifically includes,

[0067] Step S21, according to the position of the support beam 5, set up concrete pier foundation 7 at the end, and embed steel plate at 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 indoor first floor structure surface layer), or according to the structure design, use the newly added floor beam or hardened site;

[0068] Step S22, polish the bottom of the enclosure wall 1 to ensure that the channel steel wall-attached joist 3 can be closely attached to the wall surface, and staggered bolt holes are arranged on the wall at the polishing position, the tensioning bolts 4 are installed in the bolt holes, and the plant glue is filled in the holes;

[0069] Step S23, after the strength of the plant glue reaches the design strength requirement, install the channel steel wall-attached joist 3;

[0070] Step S24, weld connecting plates on the channel steel wall-attached joist 3, install support beams 5, one end of the support beam 5 is bolted and connected with the connecting plate of the wall-attached joist 3, and the other end is connected and fixed with the embedded plate at the top of the concrete pier foundation 7 at the end;

[0071] Step S25, use a crane and other machinery to install 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 using staggered tensioning bolts 4;

[0072] Step S26, use a car crane in cooperation with a crane to install inclined struts 9 and inclined cables 10, and ensure that the inclined cables 10 are in a taut state;

[0073] Step S3, wall reinforcement, according to the design drawings, a reinforcing surface layer 13 is arranged on the outer facade of the enclosing wall 1, the reinforcing surface layer 13 is a reinforced mortar surface layer, which can be arranged on one side or both sides of the wall according to the design drawings, the reinforcing mesh of the reinforcing surface layer 13 is anchored into the bent column 2 through the anchor bar, in the range of the newly added main structure 14 beam slab between layers, no mortar surface layer is applied, but the longitudinal through steel bars of the reinforcing mesh of the reinforcing surface layer 13 need to be ensured to be continuous and anchored in the beam slab, in the conflict position of the attached wall steel plate belt 8 and the attached wall joist 3, the longitudinal through steel bars of the reinforcing mesh of the reinforcing surface layer 13 need to be handled by post-slashing, after the structure of the conflict position is removed, the post-slashing steel bars are connected and reinforced, and the mortar surface layer is applied, since the wall at the door and window hole position needs to be broken and removed, in order to avoid material waste, no reinforcing surface layer 13 is arranged at the original enclosing wall 1 wall in the range of the door and window hole;

[0074] Step S4, foundation reinforcement, according to the geological survey report and the building foundation load requirement, a suitable foundation treatment scheme is adopted to reinforce and treat the foundation, wherein, the selection principle of the foundation treatment scheme is as follows,

[0075] I. The natural foundation can meet the bearing capacity requirement, and the natural foundation is recommended to be used;

[0076] II. When the site has replacement conditions, it is recommended to use clay or graded sand replacement treatment;

[0077] III. When the site does not have replacement conditions, it is recommended to use grouting steel pipe pile composite foundation for foundation treatment, the treatment depth and treatment range (expanded outward according to the specification) should be determined according to the foundation soil condition of the building, engineering requirements and equipment and other factors;

[0078] Step S5, bent column 2 foundation excavation and reinforcement, as shown in Figure 5 , the cross section reinforcement method is adopted to reinforce the bent column 2 foundation, after the reinforcement is completed, the foundation is backfilled and compacted by layering and rolling, the specific steps include,

[0079] Step S51, the bent column 2 foundation is excavated by interval jumping, the upper part of the foundation is excavated by machine, and the soil at the bottom of the enclosing wall 1 is reserved;

[0080] Step S52, the soil at the bottom of the enclosing wall 1 is manually excavated, wood, adjustable U support, steel pad and other materials are used as vertical supports 11 to temporarily support the bottom of the wall, the vertical supports 11 are arranged at intervals below the enclosing wall 1 at the excavation position, the bottom end thereof abuts on the soil at the excavation surface, and the top end thereof abuts on the bottom end surface of the enclosing wall 1, the wall at the excavation section is supported and unloaded through the vertical supports 11, and the stability of the wall is further improved;

[0081] Step S53, pouring a concrete cushion layer and reserving a metal anchor plate;

[0082] Step S54, according to the design drawing position, install the shear steel 12, the axis direction of which is perpendicular to the wall direction of the retaining wall 1, the bottom of which is welded and fixed with the metal anchor plate, and the upper surface of which is horizontally and fixedly installed with a level ruler for monitoring deformation;

[0083] Step S55, the original foundation is chiseled and implanted with connecting anchor bars, and the through-wall, through-column steel bars and wall inserting bars are installed at the surface position of the enlarged interface of the foundation;

[0084] Step S56, install the foundation formwork, pour the foundation concrete, maintain the foundation concrete, remove the foundation formwork, and the temporary vertical support 11 at the bottom of the retaining wall 1;

[0085] Step S57, construct the backfill soil of the bent column 2 foundation, and compact it by layering and rolling;

[0086] Step S58, repeat steps S51-S57 until all bent column 2 foundations are reinforced, wherein the adjacent foundation excavation should be performed after the strength of the adjacent foundations on both sides reaches more than 75% of the design strength after reinforcement, and after the foundation backfilling is completed;

[0087] Step S6, construct the new main structure 14, according to the design drawing, sequentially construct each layer of the new main structure 14 (ground beam, frame beam, structural floor slab, etc.) from bottom to top, and simultaneously embed the inclined anchor bars 16, the new main structure 14 is connected to the retaining wall 1 and the bent column 2 by anchor bars, the inclined anchor bars 16 are inclined and penetrate the retaining wall 1, the bottom end is anchored into the new main structure 14, and the top end penetrates the retaining wall 1 and extends to the outside of the retaining wall 1, because the inclined anchor bars 16 need to be simultaneously embedded, before pouring the beam and slab concrete, inclined holes need to be drilled in the wall and the inclined anchor bars need to be pre-buried;

[0088] Step S7, construct the wall deviation correction steel plate beam 15, as shown in Figure 6 , the deviation correction steel plate beam 15 is fixedly connected to the top end of the inclined anchor bar 16 on the outside of the retaining wall 1, and the deviation correction steel plate beams 15 at the same layer position are connected as a whole on the outside of the building, the load of the retaining wall 1 is unloaded to the new main structure 14 through the deviation correction steel plate beam 15 and the inclined anchor bar 16 to avoid using the thickening and reinforcement surface layer 13 process, the specific steps are as follows,

[0089] Step S71, fill the inclined hole of the inclined anchor bar 16 with adhesive;

[0090] Step S72, pass the inclined anchor bar 16, install the steel plate of the deviation correction steel plate beam 15 in blocks, and paste it to the wall surface with high-strength polymer mortar;

[0091] Step S73, weld the steel plate blocks to form a whole;

[0092] Step S74, cutting off the excess inclined anchor 16 beyond the end of the steel plate;

[0093] Step S75, plug welding of the inclined anchor 16 and the steel plate;

[0094] Step S76, rust and fireproof treatment of the surface of the steel plate.

[0095] Step S8, when the construction of the steel plate beam 15 on the outer side of the wall body is completed and the anchor bar is planted to the design strength (usually, the pouring of the new main structure 14 is completed for about five to seven days, and the concrete strength reaches 70%-80% of the design strength), the entire inclined support system at the completed layer position can be removed, of course, the inclined support system can be removed all at once to provide sufficient safety redundancy, but since the reinforcement surface layer 13 and the foundation reinforcement process of the bent column 2 have been completed during the construction of the new main structure 14 in step S6, the inclined support system on both sides of the enclosing wall 1 can also be removed in advance, and the inclined support system on the side with poor stability is retained (in the case of wall body inclination, the inclined support system on the side of the inclination direction is retained during the first removal, and the other side is removed for recycling to reduce material investment costs), and the inclined support system on the other side of the enclosing wall 1 can be removed when the construction reaches this step (step S8);

[0096] Step S9, door and window hole construction, according to the design drawings, the door and window hole construction is carried out on the enclosing wall 1, and the specific steps are as follows,

[0097] Step S91, first pop line, and reserve the size of the lintel and frame;

[0098] Step S92, first cut the wall in the door and window hole range with a water saw, and then manually break the enclosing wall 1 with a pneumatic pick and other tools;

[0099] Step S93, binding the reinforcement at the door and window hole position, supporting the formwork, pouring concrete, curing, and removing the formwork;

[0100] Step S10, wall decoration layer construction, the wall decoration layer is constructed on the outer side of the enclosing wall 1, the thickness of the wall decoration layer (such as the thermal insulation layer) is adjusted to ensure that the perpendicularity of the wall body meets the requirements of the construction quality acceptance specification, and this step can be omitted when there is no external facade visual acceptance requirement.

[0101] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A construction method for adding floors, reinforcing and renovating 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 tilt direction of the wall, and setting settlement and displacement monitoring points on the wall in accordance with the requirements of the specification; Step S2: wall support, 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: Strengthen the foundation according to the geological survey report and the building foundation load requirements; Step S5, excavating and reinforcing the foundation of the bent column (2), and adopting the cross-section enlargement reinforcement method to reinforce the foundation of the bent column (2). After the reinforcement is completed, the foundation is backfilled and compacted layer by layer; Step S6, constructing the newly added main structure (14), according to the design drawings, constructing each layer of the newly added main structure (14) from bottom to top, and simultaneously burying the oblique anchor bars (16), the newly added main structure (14) is connected to the retaining wall (1) and the bent column (2) by anchor bars, the oblique anchor bars (16) obliquely penetrate the retaining wall (1), the bottom end of the anchor bar is anchored in the newly added main structure (14), and the top end of the anchor bar penetrates the retaining wall (1) and extends to the outside of the retaining wall (1); Step S7, constructing a wall correction steel plate beam (15), wherein the correction 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 correction steel plate beams (15) at the same level are connected as a whole on the outside of the building; Step S8, dismantling the oblique support system at the completed layer position; Step S9, door and window opening construction, according to the design drawings, door and window opening construction is carried out on the retaining wall (1); The oblique support system comprises a wall-attached support beam (3), a wall-attached steel plate strip (8), a supporting beam (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 inner and outer facades 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 beam (5) is arranged at intervals along the wall-attached support beam (3). One end of the supporting beam (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 the pier base (7) set on the floor. The oblique support rod (9) is arranged obliquely, and its top end is connected and fixed to the connecting ear (6) fixedly set on the wall-attached steel plate strip (8), and its bottom end is connected and fixed to the connecting ear (6) fixedly set at the end of the supporting beam (5).

2. A construction method for adding floors, reinforcing and renovating a bent factory building according to claim 1, characterized in that: The oblique support system further comprises an oblique cable (10), which is arranged obliquely and is in a taut state, with its top end connected and fixed to a connecting ear (6) fixedly arranged on the wall-attached steel plate strip (8), and its bottom end connected and fixed to a connecting ear (6) fixedly arranged at the end of the supporting beam (5).

3. The method for reinforcing and renovating a bent factory building according to claim 2 is characterized by: The step S2 specifically includes: Step S21, according to the position of the supporting beam (5), a pier foundation (7) is set 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 anchoring glue reaches the design strength requirement, the wall joist (3) is installed; Step S24, installing a supporting beam (5) between the wall-attached support beam (3) and the pier base (7), wherein one end of the supporting beam (5) is connected and fixed to the wall-attached support beam (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 with 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.

4. 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, the mortar surface layer is not applied, but 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.

5. 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 jump 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 steel (12) according to the position of the design drawing, wherein 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 to the metal anchor plate, and the upper surface thereof is horizontal and fixed with a level rod for monitoring deformation; Step S55: chisel out the original foundation, implant connecting anchor bars, and install through-wall and through-column steel bars and wall insert 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, constructing the backfill soil of the bent column (2) foundation and compacting it 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.

6. 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 outside 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.

7. 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 original enclosure wall (1) within the range of the door and window openings.

8. 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 bent columns (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.

9. 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 rust-proof and fire-proof treatment measures.

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