CN113374295A - Old steel-wood structure roof truss dismantling and rebuilding construction method - Google Patents
Old steel-wood structure roof truss dismantling and rebuilding construction method Download PDFInfo
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- CN113374295A CN113374295A CN202110830209.0A CN202110830209A CN113374295A CN 113374295 A CN113374295 A CN 113374295A CN 202110830209 A CN202110830209 A CN 202110830209A CN 113374295 A CN113374295 A CN 113374295A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
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Abstract
The invention discloses a construction method for dismantling and rebuilding old steel-wood structure roof trusses, which comprises the following steps: s1: removable wall removal S2: permanently reinforcing the foundation; s3: temporarily reinforcing the wall column; s4: dismantling the roof; s5: permanently reinforcing the wall column; s6: and (5) repairing the wall. The invention has the advantages that: can the original main part of at utmost protection, strengthen intensity simultaneously again, for avoiding the foundation ditch to warp and cause the influence to the wall body, the factory building reinforcement can be demolishd with the roofing, excavation supporting engineering, underground above ground structural engineering construction coordinate each other, demolish the rebuild to ancient building and have positive effect, especially original factory building belongs to the dangerous room, can reduce and reform transform the safety risk.
Description
Technical Field
The invention relates to a demolition and reconstruction construction method for an old steel-wood structure roof truss, and belongs to the technical field of building construction.
Background
Ancient buildings refer to civil buildings and public buildings before the country construction with historical significance. In China, a plurality of ancient towns and most of large cities still keep some ancient buildings. However, in the present of the great interest of civil engineering, we want to see and protect ancient buildings and their cultural traits; the ancient architectural culture is preserved in the world, and the ancient cultural heritage generates modern value. Many ancient buildings adopt steel-wood structures, and as the ancient buildings are repaired and undergo years of ceremonies, the ancient buildings need to be rebuilt to be revived. In the process of demolishing and rebuilding ancient buildings, the original structure needs to be protected to the maximum extent, effective reinforcement needs to be carried out on the structure, construction of underground, ground and roofs is involved, and the rebuilding process is very complex.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method for dismantling and rebuilding old steel-wood roof trusses.
The invention is realized by the following scheme: a construction method for demolishing and rebuilding old steel-wood structure roof trusses comprises the following steps:
s1: the wall body can be disassembled;
s2: permanently reinforcing the foundation;
s3: temporarily reinforcing the wall column;
s4: dismantling the roof;
s5: permanently reinforcing the wall column;
s6: and (5) repairing the wall.
The S1 comprises non-bearing wall dismantling and bearing wall dismantling, wherein the non-bearing wall dismantling process comprises the following steps: cleaning a field → performing temporary safety isolation → dismantling a wall → arranging a support → manually cleaning complete bricks → carrying garbage, manually dismantling the filler wall after the door and window opening below the ring beam, building a scaffold after the filler bricks at the upper part of the ring beam are reinforced and backfilled on the foundation, and manually dismantling by utilizing the scaffold; the construction method for dismantling the bearing wall comprises the following steps: firstly, building double-row fastener type landing scaffolds inside and outside a shaft and a shaft chamber; secondly, dismantling the roof structure; the third part, demolish axle and shaft wall column; fourthly, building the wall columns again; and fifthly, dismantling the scaffold.
The permanent foundation reinforcement in the S2 comprises the following processes: excavating foundation earthwork, pouring a cushion layer, constructing foundation reinforcing steel bars, installing templates, constructing concrete, maintaining the concrete and backfilling the foundation earthwork.
After the cushion layer is poured, three stages of 12 reinforcing steel bars are respectively implanted into the periphery of the original foundation, the length of the reinforcing steel bars implanted into the foundation is not less than 200mm, 4 reinforcing steel bars are vertically arranged, and the longitudinal distance is 500 mm.
The construction process flow for temporarily reinforcing the wall column in the S3 is as follows: inspection before reinforcement → scaffold erection → column reinforcement → wall reinforcement → inspection and evaluation.
The scaffold is erected in the following sequence: foundation construction → placement of longitudinal floor-sweeping poles → upright poles → transverse floor-sweeping poles → first-step longitudinal horizontal poles → first-step transverse horizontal pole connection → second-step longitudinal horizontal poles → second-step transverse horizontal poles →.
The construction procedure of roof dismantling construction in the step S4 is as follows: surveying and mapping original roof trusses, modeling → erecting scaffolds → dismantling the roof trusses.
The process flow of the permanent reinforcing construction of the wall column in the S5 is as follows: permanent foundation reinforcement → surface cleaning of reinforced front column → erection of scaffold → reinforcement of column → inspection and acceptance.
The repair of the wall body in the S6 comprises the steps of repairing exposed brick columns and walls and repairing the brick columns without the exposed brick columns and the exposed brick walls, and the process for repairing the exposed brick columns and the exposed brick walls comprises the following steps: symmetrically grooving during repair construction of exposed brick walls and exposed columns, wherein the groove depth of each brick wall is 20mm, the groove depth of each brick column is 60mm, after one groove is formed, the brick walls and the exposed columns are cleaned up immediately, an A6 steel bar is embedded into each 2-pitch brick, and after the brick walls and the exposed columns are fully wetted, the brick walls and the exposed columns are compacted and leveled by cement mortar in a ratio of 1: 1; the construction process without exposed brick walls and brick columns is as follows: chiseling a whitewash layer → removing dust, supplementing the surface → laying a reinforcing mesh → spraying water to wet the reinforcing surface → mixing mortar → spraying mortar → maintaining.
When repairing cracks of the brick wall and repairing crack parts of the brick wall in the S6 process, the depth of a mortar joint groove is 30mm, the mortar joint groove is scrubed by 1:2 cement mortar after being cleaned and fully wetted, bricks are pulled out and rebuilt every 5 bricks within the crack range, and 3 steel bars are horizontally arranged
The invention has the beneficial effects that: can the original main part of at utmost protection, strengthen intensity simultaneously again, for avoiding the foundation ditch to warp and cause the influence to the wall body, the factory building reinforcement can be demolishd with the roofing, excavation supporting engineering, underground above ground structural engineering construction coordinate each other, demolish the rebuild to ancient building and have positive effect, especially original factory building belongs to the dangerous room, can reduce and reform transform the safety risk.
Detailed Description
The present invention is further illustrated below, but the scope of the invention is not limited to the disclosure.
In the following description, for purposes of clarity, not all features of an actual implementation are described, well-known functions or constructions are not described in detail since they would obscure the invention with unnecessary detail, it being understood that in the development of any actual embodiment, numerous implementation details must be set forth in order to achieve the developer's specific goals, such as compliance with system-related and business-related constraints, changing from one implementation to another, and it being recognized that such development effort might be complex and time consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art.
A construction method for demolishing and rebuilding old steel-wood structure roof trusses comprises the following steps: s1: removable wall removal S2: permanently reinforcing the foundation; s3: temporarily reinforcing the wall column; s4: dismantling the roof; s5: permanently reinforcing the wall column; s6: and (5) repairing the wall.
S1: and the wall can be disassembled.
Dismantling a non-bearing wall construction method: cleaning a field → performing temporary safety isolation → dismantling a wall → arranging a support (as required) → manually cleaning complete bricks → carrying garbage, manually dismantling the filler wall after the door and window opening below the ring beam, erecting a scaffold after reinforcing and backfilling the foundation by using part of filler bricks on the upper part of the ring beam, and manually dismantling by using the scaffold; when the non-bearing wall body is dismantled, if the lintel and the ring beam above and the supporting structure below are complete, the filler wall body can be directly and manually dismantled. After the wall body is dismantled, 1-2 supports can be arranged in the middle of the opening according to needs. Construction method for dismantling bearing wall
The construction method for dismantling the bearing wall comprises the following five steps: firstly, building double-row fastener type landing scaffolds inside and outside a shaft and a shaft chamber; secondly, dismantling the roof structure; the third part, demolish axle and shaft wall column; fourthly, building the wall columns again; fifthly, dismantling the scaffold; the construction axis and the vertical pole of the scaffold at the column position are erected on the floor scaffold, the longitudinal distance is 1.5m, the transverse distance is 0.9m, the step distance is 1.8m, and at least 2 inclined struts are arranged at each column position.
S2: and (6) permanently reinforcing the foundation.
The permanent foundation reinforcement comprises the following processes: excavating foundation earthwork, pouring a cushion layer, constructing foundation reinforcing steel bars, installing templates, constructing concrete, maintaining the concrete and backfilling the foundation earthwork.
The foundation earthwork excavation adopts a manual cooperation mini-excavator mode to excavate, the excavation is carried out after the excavation is carried out to a distance of 20-30cm from a foundation, the foundation condition needs to be manually ascertained before the excavation, one section is selected to carry out trial excavation firstly, measures are made by combining the site trial excavation condition, the large-area excavation construction can be guaranteed after safety, a newly added foundation bearing layer is 2 layers of powder clay layers, the characteristic value of the foundation bearing capacity is 130KPa, the bearing capacity is detected by using a light contact detector, the excavation depth of the foundation is 1.63-1.82 m, the excavation width is 2.48m (2.1)2.6m, a 500mm wide working face is reserved at each side, the excavation needs to be carried out at intervals, and the cushion layer pouring is completed after the height of the recheck.
Secondly, pouring a cushion layer: after the foundation is excavated and the foundation is qualified by the construction unit, the design unit and the supervision unit, the concrete is transported to the foundation accessory by the trolley, and the C15 fine stone concrete cushion bottom sealing with the thickness of 100mm is poured in time to prevent the foundation trench from being exposed for a long time and influencing the foundation holding force quality.
Thirdly, constructing foundation reinforcing steel bars: after the cushion layer pouring is finished, three levels of 12 reinforcing steel bars are respectively implanted into the periphery of the original foundation, the length of the reinforcing steel bars implanted into the foundation is not less than 200mm, 4 reinforcing steel bars are vertically arranged, and the longitudinal distance is 500 mm. The vertical reinforcing steel bars C12@500 of the newly-added brick wall foundation are uniformly arranged, and the horizontal distribution ribs 8C10 are arranged along the periphery of the foundation.
The construction technology of the bar planting engineering is as follows: and (3) bar planting material: the steel bar for bar planting should use hot rolling ribbed bar or full-thread screw rod, must not use smooth steel bar and anchor position unthreaded screw rod, the hot rolling ribbed bar for bar planting should adopt HRB400 level, its quality should accord with current national standard, the organic adhesive for bar planting should adopt modified epoxy resin class or modified vinyl vinegar class material, its curing agent should not use second limb, the construction unwrapping wire: accurately releasing the position of the hole for the embedded steel bar according to a structural construction drawing and in combination with the actual situation of a field; drilling and cleaning: and (5) drilling holes by using an electric hammer according to the marked hole positions until the designed depth is reached. After drilling, the inside of the hole is ensured to be dry; cleaning the hole wall: firstly, blowing off dust in the holes by using a blower, and then cleaning the hole walls by dipping cotton yarns in acetone until the holes are clean; preparing glue: pouring the glue solution into a clean container according to the requirements of the use specification of the structural glue product, completely and uniformly mixing the glue solution by a manual or electric tool, and turning over the colors of the bottom and the corners of the container to ensure that the prepared glue has consistent color; and (3) bar planting: the adjusted structural adhesive is filled into a glue injector, then the structural adhesive is injected into the hole of the embedded steel bar by the glue injector, the glue injection capacity in the hole must be larger than 2/3, the steel bar is rotated to be slowly implanted into the hole to enable the hole to reach the design depth requirement, and the hole needs to be blocked after the steel bar is implanted in the horizontal direction; and (3) curing: when the temperature is above 10 ℃, the curing time can be used after being stressed after reaching 48 hours, when the temperature is above 24 ℃, the curing time can be used after being stressed after reaching 36 hours, and when the temperature is lower than 0 ℃, infrared heating is adopted. The reinforcing steel bars cannot be disturbed during curing, and the hole openings of the reinforcing steel bars are sealed and repaired by structural adhesive after curing; and (3) detection: in order to detect whether the embedded steel bar meets the design requirement, the embedded steel bar is subjected to sampling detection, and the detection result must meet the design requirement.
Fourthly, installing a template: pouring for two times, wherein a base template is a 15mm thick multilayer board, and vertical secondary keels are made of 60-80 mm battens and are spaced at 250mm intervals; the transverse main keels are made of double steel pipes with the diameter of 48 multiplied by 3.6mm, the distance between the first main keel and the ground is 80mm and 500mm, M14 counter-pull screws are used for fixing, the horizontal distance is 750mm and the vertical distance is 500mm, the foundation embedded parts are composed of anchor plates and reinforcing steel bars, the specification of the anchor plates is 300 x 180 x 16mm steel plates, 6C 14 anchoring reinforcing steel bars with the length of 500mm are welded, the embedded parts are installed at the position with the elevation of-0.05M on the top surface of a cast-in-place concrete foundation and are directly bound on the main reinforcements during installation, and the position condition of the embedded parts needs to be observed at any time during concrete pouring so as to solve the problem in time.
Fifthly, concrete construction: preparing before concrete pouring, cleaning a concrete base layer, checking a template, a reinforcing steel bar protective layer and an embedded part to ensure that sundries in the template and on reinforcing steel bars are cleaned, gaps and holes are blocked, making data such as template pre-inspection, reinforcing steel bar hidden inspection and the like, and pouring concrete after the data meet the requirements; pouring concrete: c30 concrete is adopted as a foundation, the free falling height of the poured concrete is not more than 2m, and when the free falling height exceeds 2m, a chute method is adopted; the pouring of the concrete should be continuously carried out in layers, generally the layering is 1.25 times of the length of the action part of the vibrator, and the maximum thickness is not more than 50 cm; when the concrete is vibrated, the 'fast inserting and slow pulling' is realized, and the vibrating rod is slightly pulled up and down so as to uniformly vibrate up and down. The moving distance of the vibrating rods is not more than 1.4 times of the acting radius of the vibrating rods, the inserting point vibrating time is preferably 20-30 s, and when the surface of the concrete is horizontal, the concrete mixture does not sink obviously any more, bubbles do not appear any more, and the surface is optimally pulped, a secondary vibrating method is adopted.
Sixthly, concrete curing: immediately covering a plastic film after the concrete is initially set for moisture preservation and heat preservation, watering and curing after the concrete is finally set, and curing the common concrete for not less than 7 days.
Seventhly, backfilling foundation earthwork: and backfilling earthwork after the concrete is cured to reach the strength, compacting the backfilled earthwork layer by layer, backfilling the original soil to be flush with the ground in the existing room in time after the construction of the column foundation is finished, cleaning up garbage, sundries and the like on the foundation before backfilling, wherein the thickness of the layer is not more than 200mm, the compaction degree is 0.94, backfilling the foundation and the two sides of the ground beam firstly, and tamping manually for 5 times.
S3: temporarily reinforcing the wall column;
the reinforcement construction process flow comprises the following steps: inspection before reinforcement → scaffold erection → column reinforcement → wall reinforcement → inspection and evaluation.
Checking before reinforcing, and temporarily reinforcing construction conditions of a wall column: the method comprises the following steps of (1) inspecting a wall body and a column before reinforcing construction, ensuring that construction can be carried out after safety, finishing foundation reinforcement before reinforcing the wall body, finishing erection of a scaffold and acceptance inspection, and basically finishing dismounting of the wall body when the upper part of a ring beam needs to be dismounted; design of the floor scaffold: the vertical distance between the upright poles of the scaffold is 1.5m, the row distance between the upright poles is 0.9m, the step distance between the large cross bars is 1.8m, the small cross bars of the scaffold body are arranged on the large cross bars, but the position of the floor sweeping rod is arranged to be that the small cross rod is arranged below the large cross rod, the inner vertical rod is 350mm away from the structural surface, the full-length floor sweeping rod which is 200mm away from the ground is required to be erected at the bottom, the cross braces are arranged at the outer side of the scaffold and are continuously arranged along the full length of the scaffold, the lap joint of the cross brace steel pipes is not less than 1000mm and is not less than 3 fasteners, the distance from the edge of a cover plate of the end fastener to the rod end is not less than 100mm, the scaffold board must be fully paved on the operation layer of the frame, the small cross rod is properly added under the scaffold board, the probe board cannot appear, the scaffold board and the small cross rod are firmly tied by using iron wires, a flat net is hung below the outer frame, two step frames and one step frame are required to be closed between a building and the inner upright rods, a fully-closed dense mesh safety net is arranged on the inner side of the outer frame, and a foot baffle plate with the height of 180mm and a body protection railing with the height of 1200mm are arranged on an operation layer.
Secondly, erecting a scaffold, and 1) a scaffold construction process: setting up a sequence: foundation construction → placement of longitudinal floor-sweeping poles → upright poles → transverse floor-sweeping poles → first-step longitudinal horizontal poles → first-step transverse horizontal pole connection → second-step longitudinal horizontal poles → second-step transverse horizontal poles →.
2) Installing a vertical rod: the vertical spacing of the vertical rods is 1.5m, and the transverse spacing is 0.9 m. When the vertical rods are installed, the vertical rods are arranged in the inner row at first and then arranged in the outer row at last. When the vertical rods of each row are connected, the vertical rods at the two ends are firstly erected, then the middle vertical rod is erected, the vertical rods at the middle part are erected after being mutually aligned, the connecting line of the two vertical rods at the inner row and the outer row is vertical to the wall surface, and when the vertical rods are connected, the vertical rods are preferably connected with the outer row firstly and then connected with the inner row. The vertical rods are connected in a butt joint mode, butt joint buckles are arranged in a staggered mode, joints of two adjacent vertical rods are not required to be arranged in synchronization, the staggered distance of two separated joints which separate one vertical rod in the synchronization in the height direction is not less than 500mm, and the distance from the center of each joint to a main node is not greater than 1/3 of step pitch.
3) Installing a floor sweeping rod: the vertical sweeping rod is fixed on the installed vertical rod through a right-angle fastener, the transverse sweeping rod is fixed on the vertical rod close to the lower part of the vertical sweeping rod, and the distance between the vertical sweeping rod and the ground is 200 mm.
4) Installing a first-step longitudinal horizontal rod: the longitudinal horizontal rod is preferably arranged at the inner side of the vertical rod, and the length of the longitudinal horizontal rod is not less than 3 spans; the longitudinal horizontal rod extension is preferably connected by a butt fastener or by lap butt lap joint, and the following regulations are met: the butt fasteners of the longitudinal horizontal rods should be staggered: joints of two adjacent longitudinal horizontal rods are not suitable to be arranged in a synchronous or same span, and the staggered distance of the two adjacent joints in the horizontal direction of the asynchronous or different spans is not less than 500 mm; the distance from the center of each joint to the nearest main node is not larger than 1/3 of the longitudinal distance; the lap length should not be less than 1m should be equidistant 3 fixed tip fastener apron edges of rotatory fastener and the distance of lapping vertical horizontal rod end should not be less than 100mm, in time hangs green close mesh safety net along with the setting up of shelf, forms totally closed construction.
5) Installing a first-step transverse horizontal rod: the horizontal rods are arranged on the lower side of the large cross rod and are connected with the vertical rods and the longitudinal horizontal rods through right-angle fasteners, each main node (namely the intersection of the vertical rods and the longitudinal horizontal rods) is provided with one horizontal rod, and for the small cross rod spacing of 0.75m on the operating floor, the distance of the axis of the rod deviating from the main node is not more than 0.15 m. The upper and lower layers of transverse horizontal rods are arranged at the vertical rods in a staggered manner, and the adjacent transverse horizontal rods at the same layer are arranged oppositely at the vertical rods.
6) Installing longitudinal and transverse horizontal rods in the second step: the second step of the installation method of the longitudinal and transverse horizontal rods is the same as the first step of the installation method of the longitudinal and transverse horizontal rods, but only the first horizontal rod is arranged below the longitudinal horizontal rod, the transverse horizontal rods at the other parts are all arranged above the longitudinal horizontal rod, and the main node is required to be provided with the transverse horizontal rods.
7) Setting a wall connecting piece: the horizontal arrangement interval of the wall connecting pieces is 4.5m, the vertical interval is 3.6m (two-step three-span), and the indoor scaffold and the outdoor scaffold are connected with each other by fasteners for penetrating through holes of the wall body through steel pipes.
8) A scaffold board: the scaffold board of the operation layer adopts a steel basketry net, the size is 1500 multiplied by 900, the quality of the steel basketry sheet is qualified, the aperture is tightly combined, and four zinc-plated steel wire hoops with the diameter of 12mm are arranged at two ends. A horizontal net pocket is additionally arranged at the lower part of the operation layer, rises along with the operation layer, and the operation layer does not exceed two layers. The first layer is fully paved with a layer of scaffold board, the interlayer is also required to be fully paved with a layer of bamboo scaffold board, a safety net and a protective railing are arranged, the scaffold board is required to be tiled, fully paved and stably paved, two small cross rods are arranged at the joint, and the distance between each rod and the joint is not more than 15 cm. The distance between the scaffold board close to one side of the wall and the structural wall is not more than 15 cm. The scaffold boards in two directions at the corners are overlapped and placed, so that the phenomena of probes and neutral positions are avoided.
9) Bracing: in order to ensure the overall safety of the scaffold, the inclined strut is arranged when the scaffold is erected, the inclined strut is arranged according to five spans and is connected with a scaffold end main node, a 1m long steel pipe is arranged at a pivot of the inclined strut at the ground end and is deeply buried underground, the ground is leaked by 30cm, and the bottom end of the inclined strut is connected with the steel pipe.
10) The scissors are arranged: continuously arranging a cross brace on the full vertical surface of the outer side of the scaffold from bottom to top; the width of each cross brace is not less than 4 spans and not less than 6m, and the inclination angle between the diagonal rods and the ground is preferably 45-60 degrees; the extension of the diagonal bracing rods is in lap joint, the lap joint length is not less than 1m, the diagonal bracing rods are fixed by not less than 3 rotary fasteners, and the distance from the edge of a cover plate of an end fastener to the end of each rod is not less than 100 mm; the cross bracing diagonal rods are fixed on the extending ends or the vertical rods of the transverse horizontal rods intersected with the cross bracing diagonal rods by using rotary fasteners, and the distance between the center lines of the rotary fasteners and the main node is not more than 150 mm.
11) The safety net is arranged: when the whole net is hung, the dense mesh net used as a vertical net is strictly forbidden to be used as a horizontal net, when the vertical net is hung, the vertical net is firmly bound with a large cross rod and a vertical rod of a scaffold by using a nylon rope or a 16# iron wire, all nodes on a safety net must be bound in place, and the phenomenon of binding missing is strictly forbidden; for a horizontal safety net, a rope on the net must be firmly and reliably bound with a scaffold; when the whole net is bound, the whole net is required to be synchronously carried out along with a construction layer, and the vertical net is firstly lifted to be 1.5 meters above an operation layer surface so as to carry out operation construction. The horizontal safety net is provided with a fixed horizontal safety net from the position of the cantilever beam to every three layers. The horizontal safety net is not more than 0.05m away from the gap of the wall surface and is firmly tied with the cross bar by a rope;
thirdly, column reinforcing construction: wrap angle steel (outdoor) and channel-section steel (the indoor is faced the combination forever) outside the brick post, form the lattice column, wrap the brick post at the lattice column inboard, do certain support outside the lattice column to increase the stability of brick post, support and make with 20# channel-section steel, the bracing is in the 4.5 meters high position of wall post.
Fourthly, wall body reinforcing method: two sides of the wall body between the column spans are reinforced by galvanized square pipes with the length of 160 × 80 × 10mm, three lines are arranged in the horizontal direction, the distance is 1.5 meters, the length is equal to the length of the wall, and the intersection of the column and the lattice column steel batten plate are connected in a welding mode. The vertical direction interval is 3 meters, and wall body both sides side square tube penetrates C20 steel bar welding through the wall body hole every 1.5 meters and forms wholly, installs the horizontal direction earlier when reinforcing square tube installation, installs the vertical direction afterwards. 20# channel steel is established to every stand heelpiece, and stand and channel-section steel welding set up double construction scaffold frame in wall body both sides during installation side pipe, and support body length is with the wall length, highly with the wall height. Scaffold frame safety protection and operation platform. The structural steel beam is transported to a corresponding position in a manual transportation mode, the inclined strut channel steel is supported on a concrete pier column arranged on the ground, the channel steel is welded with a reinforcing square pipe for preventing the channel steel from loosening, the plain concrete pier column is 500 x 600mm in specification, the concrete strength grade is C30, an embedded plate is installed on the pier column, the embedded part is composed of an anchor plate and reinforcing steel bars, the anchor plate is 300 x 180 x 16mm in specification, and 6C 14 steel bars with the anchoring length of 350mm are welded. The embedded part is arranged at the position of elevation-0.05 m on the top surface of the cast-in-place concrete foundation.
Fifthly, examination and evaluation: and after the reinforcing construction is finished, the wall column reinforcing effect is checked and evaluated by a supervision unit, a design unit and a construction unit, and the reinforcing effect is confirmed.
S4: roof dismantling construction
And (3) construction procedures: surveying and mapping original roof trusses, modeling → erecting scaffolds → dismantling the roof trusses.
The method comprises the steps of firstly, surveying and mapping original roof trusses, modeling (three-dimensional scanning, BIM modeling and the like), surveying and mapping the original roof trusses by using a climbing vehicle, drawing detailed dimension marking positions for each roof truss and each wood purlin according to surveying and mapping results, and drawing drawings. All roof truss members and other roof members are numbered uniformly, the numbering is concise, and the specific axial line position and member type of the members can be distinguished through the numbering.
Secondly, erecting a scaffold: the pole setting interval that full hall scaffold set up is 1.5 × 1.5 meters, and the horizon bar step is 1.8 meters, and scaffold operation layer lays scaffold board above-mentioned scaffold set up.
Thirdly, dismantling the roof truss: the dismantling construction steps are as follows: and (4) carrying out roof dismantling construction from east to west, namely dismantling the asbestos tiles of the roof, and then dismantling the purlins and the roof truss connecting rods.
S5: permanent reinforcement of wall columns
The process flow of the reinforcement construction comprises the following steps: permanent foundation reinforcement → surface cleaning of reinforced front column → erection of scaffold → reinforcement of column → inspection and acceptance.
Firstly, cleaning the surface of the reinforced front pillar.
And secondly, erecting a scaffold.
Thirdly, a column reinforcing construction method:
1. the permanent processing of the column comprises the steps that 20# channel steel is installed on two sides of the column, and the channel steel is respectively connected with embedded parts at the top surface of the foundation, the elevation 3.65 and the elevation 7.65 in a welding mode.
2. Planting bars and installing embedded parts: according to a design drawing, 3C 16 steel bars are respectively implanted into the ring beam at the elevation 3.65m of the two sides of the column, 6C 16 steel bars are implanted into the ring beam at the elevation 7.65m, the implantation length is not less than 200mm, and then 250 x 100(200) x12 steel plates are welded to be used as embedded parts.
3. Channel steel installation: and (4) mounting channel steel after the embedded parts are welded, and transporting and carrying the channel steel to a corresponding position by a crane. And (3) welding the channel steel on the floor scaffold by constructors, and respectively welding the channel steel with the basic embedded part, the embedded part with the elevation of 3.65m and the embedded part with the elevation of 7.65 m. After the channel steel on the two sides of each column is installed, the channel steel is connected by a 100X10mm steel batten plate at the position of elevation 3.65m, and is connected by H200X 220X8X12 steel at the position of 7.65m, and the welding quality of the channel steel meets the specification requirement.
S6: and (5) repairing the wall.
Firstly, construction requirements are as follows: refilling mortar joints of all exposed brick walls and brick columns; the exposed brick wall and the brick column are not required to be reinforced by the reinforcing mesh sheets; when the fine cracks of the wall are constructed, the original cracks are chiseled into a V shape, then the cracks are cleaned up, and the crack is cut into the V shape by tools such as pointing knives, trowels and scrapers 1: and 3, filling cement mortar into the brick joints. Holes formed by wall (or beam) through steel bars are filled with high-strength non-shrinkage grouting material or adhesive; the strength grade of the brick masonry for reinforcement is improved by one grade compared with the strength grade of the original structural design and is not lower than MU15, and the whole brick masonry is selected; the strength grade of the mortar for reinforcement is not lower than that of the original structural design and is not lower than M5; and chiseling bricks at intervals of 6 bricks at the joint of the new wall body and the old wall body along the height of the wall to form horizontal notches. The new and old walls at the slot opening are staggered up and down and are built inside and outside. The joints and holes need to be tightly filled with mortar; when the brickwork connects branches, the surface of the joint must be cleaned up, watered and moistened, and the mortar joint is filled with dry-twist mortar.
Secondly, repairing exposed brick columns and walls: when exposed brick walls and columns are repaired, symmetrical grooves are needed, the groove depth of the brick wall is 20mm, and the groove depth of the brick column is 60 mm. And after a groove is formed, cleaning the brick immediately, embedding an A6 steel bar into each 2-pitch brick, fully wetting the brick, and compacting and leveling the brick by using 1:1 cement mortar.
Thirdly, exposed brick walls and brick columns are not needed to be repaired: according to the design drawing, the reinforcing mesh sheets of the exposed brick walls and the polymer mortar are not required to be plastered and reinforced. Chiseling a brick wall by an inner wall painting layer, flushing the brick wall by a high-pressure water gun after chiseling, repairing polymer mortar with the average thickness of 20mm after flushing, and smoothing the whole repaired wall. After the repair, the whole wall body should be coated with the interface agent uniformly. Then, 100 × 8 reinforcing steel bar meshes are installed firstly, and finally, the reinforcing steel bars are planted, and then, the two times of painting are carried out. The construction process comprises the following steps: chiseling a whitewash layer → removing dust, supplementing the surface → laying a reinforcing mesh → spraying water to wet the reinforcing surface → mixing mortar → spraying mortar → maintaining.
1) Wall surface treatment: firstly, removing an old plastering layer of the wall surface, removing loosened pointing mortar on the wall surface, removing the depth of brick joints by 5-10 mm, brushing the residual ash on the wall surface by a steel wire brush, blowing off surface ash powder, washing the wall surface by clear water, and watering and wetting the wall surface. When the wall is scraped and plastered, a heavy hammer, an air pick and the like are not needed to be used, and the force is not needed to be too strong so as to avoid damaging the wall. Through the measures, the reinforcing layer is well combined with the original wall body, and sufficient bonding force is generated and can bear force together.
2) Manufacturing and anchoring a reinforcing mesh: when the reinforcing mesh is laid, the vertical reinforcing steel bars are close to the wall surface and supported by reinforcing steel bar heads. The steel bar net sheets are connected in a welding mode, the steel bar net sheets are required to be derusted and decontaminated firstly, welding quality is guaranteed, and the steel bar net sheets and the wall surface are connected
The shaped through-wall ribs are welded, and the tie bars penetrate through the wall body, so that the reinforcing mesh is firmly hung on two sides of the wall body.
3) The mortar construction mixing proportion is as follows: polymer mortar: the special polymer mortar above M30 is used for painting, and the special polymer mortar is used after being approved by a certificate, a material book and the like when entering a field and is rechecked if necessary; water: the water for stirring and maintenance is clean, water which can corrode mortar or steel bars by acid and alkali cannot be contained, and the maintenance water cannot cause pollution; the mixing ratio is as follows: the mortar is M30 polymer mortar, the theoretical water-cement ratio is generally between 0.3 and 0.55, the theoretical water-cement ratio is generally not more than 0.50 in engineering practice, and when the water-cement ratio is proper, the surface of the mortar is glossy, has small resilience, is uniformly distributed, does not flow and is pasty.
4) Construction control: the wall body is reinforced by the reinforcing mesh mortar surface layer, the reinforcing mesh sheets are required to be repaired (the average thickness is 20mm) before being installed, the special interface agent is required to be coated after the repairing is finished, the thickness of the reinforcing mesh mortar surface layer is 45mm, and the gap between the reinforcing mesh and the wall surface is not required to be smaller than 5 mm. Spraying mortar in the direction: generally, according to the principle of 'from bottom to top', mortar can be prevented from being adhered to an un-sprayed wall surface and is plastered: the surface of the mortar is scraped after spraying, and the mortar is polished by an iron trowel before receiving water, and is maintained: in order to increase the strength evenly, the spraying and curing are started after the mortar is painted for 6 to 12 hours, the spraying and curing are carried out for a time which is not less than 7 days, and the spraying and curing are preferably carried out for a time which is suitable for keeping the surface of the mortar in a sufficient wet state.
Fourthly, repairing cracks of the brick wall, when repairing cracks of the brick wall, the depth of a mortar joint groove is 30mm, cleaning and fully wetting the brick wall, then trowelling the brick wall by using cement mortar with the ratio of 1:2, drawing bricks every 5 bricks within the range of the cracks and rebuilding the brick wall, and horizontally arranging 3A 6 reinforcing steel bars with the length of 740 mm. And (5) masonry bricks with the strength grade not lower than MU10 and are masonry by using 1:2 cement mortar.
Although the invention has been described and illustrated in some detail, it should be understood that various modifications may be made to the described embodiments or equivalents may be substituted, as will be apparent to those skilled in the art, without departing from the spirit of the invention.
Claims (10)
1. A construction method for demolishing and rebuilding old steel-wood structure roof trusses is characterized by comprising the following steps: the method comprises the following steps:
s1: the wall body can be disassembled;
s2: permanently reinforcing the foundation;
s3: temporarily reinforcing the wall column;
s4: dismantling the roof;
s5: permanently reinforcing the wall column;
s6: and (5) repairing the wall.
2. The demolishing and rebuilding construction method of an old steel-wood structural roof truss according to claim 1, wherein: the S1 comprises non-bearing wall dismantling and bearing wall dismantling, wherein the non-bearing wall dismantling process comprises the following steps: cleaning a field → performing temporary safety isolation → dismantling a wall → arranging a support → manually cleaning complete bricks → carrying garbage, manually dismantling the filler wall after the door and window opening below the ring beam, building a scaffold after the filler bricks at the upper part of the ring beam are reinforced and backfilled on the foundation, and manually dismantling by utilizing the scaffold; the construction method for dismantling the bearing wall comprises the following steps: firstly, building double-row fastener type landing scaffolds inside and outside a shaft and a shaft chamber; secondly, dismantling the roof structure; the third part, demolish axle and shaft wall column; fourthly, building the wall columns again; and fifthly, dismantling the scaffold.
3. The demolishing and rebuilding construction method of an old steel-wood structural roof truss according to claim 1, wherein: the permanent foundation reinforcement in the S2 comprises the following processes: excavating foundation earthwork, pouring a cushion layer, constructing foundation reinforcing steel bars, installing templates, constructing concrete, maintaining the concrete and backfilling the foundation earthwork.
4. The demolishing and rebuilding construction method of the old steel-wood structural roof truss according to claim 3, wherein: after the cushion layer is poured, three stages of 12 reinforcing steel bars are respectively implanted into the periphery of the original foundation, the length of the reinforcing steel bars implanted into the foundation is not less than 200mm, 4 reinforcing steel bars are vertically arranged, and the longitudinal distance is 500 mm.
5. The demolishing and rebuilding construction method of an old steel-wood structural roof truss according to claim 1, wherein: the construction process flow for temporarily reinforcing the wall column in the S3 is as follows: inspection before reinforcement → scaffold erection → column reinforcement → wall reinforcement → inspection and evaluation.
6. The demolishing and rebuilding construction method of an old steel-wood structural roof truss according to claim 5, wherein: the scaffold is erected in the following sequence: foundation construction → placement of longitudinal floor-sweeping poles → upright poles → transverse floor-sweeping poles → first-step longitudinal horizontal poles → first-step transverse horizontal pole connection → second-step longitudinal horizontal poles → second-step transverse horizontal poles →.
7. The demolishing and rebuilding construction method of an old steel-wood structural roof truss according to claim 1, wherein: the construction procedure of roof dismantling construction in the step S4 is as follows: surveying and mapping original roof trusses, modeling → erecting scaffolds → dismantling the roof trusses.
8. The demolishing and rebuilding construction method of an old steel-wood structural roof truss according to claim 1, wherein: the process flow of the permanent reinforcing construction of the wall column in the S5 is as follows: permanent foundation reinforcement → surface cleaning of reinforced front column → erection of scaffold → reinforcement of column → inspection and acceptance.
9. The demolishing and rebuilding construction method of an old steel-wood structural roof truss according to claim 1, wherein: the repair of the wall body in the S6 comprises the steps of repairing exposed brick columns and walls and repairing the brick columns without the exposed brick columns and the exposed brick walls, and the process for repairing the exposed brick columns and the exposed brick walls comprises the following steps: symmetrically grooving during repair construction of exposed brick walls and exposed columns, wherein the groove depth of each brick wall is 20mm, the groove depth of each brick column is 60mm, after one groove is formed, the brick walls and the exposed columns are cleaned up immediately, an A6 steel bar is embedded into each 2-pitch brick, and after the brick walls and the exposed columns are fully wetted, the brick walls and the exposed columns are compacted and leveled by cement mortar in a ratio of 1: 1; the construction process without exposed brick walls and brick columns is as follows: chiseling a whitewash layer → removing dust, supplementing the surface → laying a reinforcing mesh → spraying water to wet the reinforcing surface → mixing mortar → spraying mortar → maintaining.
10. The demolishing and rebuilding construction method of the old steel-wood structural roof truss according to claim 9, wherein: and (3) in the S6, when the cracks of the brick wall are repaired and the crack parts of the brick wall are repaired, the depth of the mortar joint groove is 30mm, the mortar joint groove is screeded by 1:2 cement mortar after the mortar joint groove is cleaned and fully wetted, the brick is pulled out and rebuilt every 5 bricks in the crack range, and 3 steel bars are horizontally arranged.
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| CN116220413A (en) * | 2023-01-05 | 2023-06-06 | 中建二局装饰工程有限公司 | House-changing masonry construction process |
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