CN112854813A - Profile steel tray structure for ancient building translation and underpinning method - Google Patents
Profile steel tray structure for ancient building translation and underpinning method Download PDFInfo
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- CN112854813A CN112854813A CN202110037172.6A CN202110037172A CN112854813A CN 112854813 A CN112854813 A CN 112854813A CN 202110037172 A CN202110037172 A CN 202110037172A CN 112854813 A CN112854813 A CN 112854813A
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- 238000000034 method Methods 0.000 title claims abstract description 37
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Abstract
The invention discloses a profile steel tray structure for translation of an ancient building, which comprises a plurality of long-direction main steel beams, short-direction steel beams and secondary steel beams which are welded with one another and are arranged according to the concrete structure of the ancient building, wherein the plurality of steel beams are welded to form a complete tray structure. The underpinning method of the profile steel tray structure for the translation of the historic building is further disclosed, the construction principle is batch and subsection symmetrical construction, and meanwhile monitoring in underpinning construction is enhanced. According to the invention, the tray structure is prepared by adopting the green and environment-friendly section steel material, and the traditional reinforced concrete tray structure is replaced, so that the generation of a large amount of construction waste is avoided, the construction period is shortened, the pollution to the environment is reduced, and meanwhile, a plurality of risks existing in the separation process of the structure and the foundation can be well solved.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a profile steel tray structure for translation of an ancient building and a underpinning method.
Background
The integral translation technology of the ancient building refers to a building technology for horizontally moving the ancient building from an original site to a new site on the premise of ensuring the structural integrity of the ancient building. The main process flow is as follows: building new foundations on new sites → building rails between new and old foundations → separating the house from the foundation or foundation after superstructure protection, reinforcement, underpinning → installing moving devices → pushing or pulling translations → joining in place. Among them, the underpinning of upper structure reinforcement is one of the difficulties in the translation technology, and the prior art generally adopts reinforced concrete structure trays. The underpinning method has the advantages of high rigidity and small deformation; the method has the defects of wet operation, long construction period, generation of a large amount of building rubbish after later-stage demolition, influence on environment and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a profile steel tray structure for the translation of the historic building, which is green and environment-friendly, short in construction period and reusable, and a underpinning method.
The invention is realized by the following technical scheme:
a shaped steel tray structure for ancient building translation, this tray structure of its characterized in that includes according to the concrete structure of ancient building and the many mutual welded long main girder steel that set up, short to girder steel and inferior girder steel, constitute complete tray structure after many girder steel welding accomplish.
The underpinning method of the profile steel tray structure for the translation of the historic building is characterized in that the underpinning method adopts the construction principle of batch and subsection symmetrical construction, and simultaneously enhances the monitoring in the underpinning construction, and specifically comprises the following steps:
1) designing the specification and the size of a steel beam according to the concrete structure of an ancient building, customizing and processing the steel beam in a factory, transporting the steel beam to a construction site, and hoisting the steel beam to a specified material stacking area by using an automobile crane;
2) the underpinning of the columns and the wall bases of the historic buildings adopts a manual local excavation soil-excavating mode to excavate and underpin batches and sections, the excavation is carried out while the underpinning is carried out, the excavation depth is the height of a steel beam, and the cross-internal area is excavated in layers to meet the design depth requirement;
3) digging holes and earth at the positions where the prestressed steel buttresses under the wall and the column foundation barred rocks are arranged, immediately installing a prestressed underpinning steel buttress to prop against the barred rocks after digging each hole, and digging and installing the prestressed underpinning steel buttresses one by one;
4) after the prestressed underpinning steel buttress is installed, digging wall and column foundation barred rock lower steel beam installation holes one by one, after one steel beam installation hole is dug, immediately perforating and installing a steel beam from the outer side to the inner side, firstly installing a long main steel beam, arranging a temporary jacking manual jack to jack the steel structure tray beam tightly, and enabling the steel structure beam to play a role of bearing the wall and the column foundation barred rock; after the long main steel beam is installed, digging short main steel beam installation holes in the same mode, installing short steel beams, machining and disconnecting the connection parts of the short steel beams and the long main steel beam in advance, adopting on-site welding and splicing, enabling the welding quality to meet the standard requirements, welding and splicing into a whole, then encrypting a jack, digging holes in the mode, installing secondary steel beams, keeping the steel beam surface horizontal, welding the steel beam surface and the long main steel beam into a whole, and encrypting the jack;
5) after the steel structure pallet beam completely supports the upper structure, manually and sectionally digging and excavating the residual soil and the rock blocks under the wall and the column foundation barred rocks;
6) leveling an indoor concrete track beam foundation, paving broken stones, pouring a cushion layer, binding reinforcing steel bars, arranging embedded parts, installing a template, pouring concrete and maintaining to the designed strength;
7) the height of the concrete track beam is 300mm, the width is 800 or 1600mm, and C25 concrete is poured for curing;
8) mounting a suspension steel plate on the surface of the concrete track beam, and fixing the suspension steel plate and the embedded part in a spot welding manner;
9) and (3) polishing the surface of the suspension steel plate, coating butter, installing hydraulic jacks according to a design preset point, after all the hydraulic jacks are installed, synchronously loading and jacking the tray beam by adopting a PLC synchronous jacking system, so that each set of hydraulic jack is uniformly stressed, removing temporary manual jacks one by one symmetrically and in batches, completing zero-sensing load conversion, and completing the installation of the tray beam system.
The underpinning method of the section steel tray structure for the ancient building translation is characterized in that the design depth requirement in the step 2) is 1320-1340 mm.
The underpinning method of the profile steel tray structure for the ancient building translation is characterized in that the digging width in the step 3) is less than 500mm, and the digging depth is the height of the steel buttress and the jack.
The underpinning method of the profile steel tray structure for the ancient building translation is characterized in that in the step 4), the digging width of the steel beam mounting hole is smaller than 500mm, and the digging depth is the height of the steel beam.
The underpinning method of the section steel tray structure for the ancient building translation is characterized in that in the step 4), the height of the long main steel beam is 400mm, and the height of the secondary steel beam is 250mm or 200 mm.
The underpinning method of the profile steel tray structure for the ancient building translation is characterized in that the concrete curing time in the step 7) is not less than 15 days.
According to the underpinning method of the profile steel tray structure for the ancient building translation, after the translation construction is completed, the steel structure tray beam can be disassembled and reused, resources are saved, and the method is green and environment-friendly.
According to the invention, the tray structure is prepared by adopting the green and environment-friendly section steel material, and the traditional reinforced concrete tray structure is replaced, so that the generation of a large amount of construction waste is avoided, the construction period is shortened, the pollution to the environment is reduced, and meanwhile, a plurality of risks existing in the separation process of the structure and the foundation can be well solved.
Drawings
FIG. 1 is a plan view of a section steel pallet in the example;
FIG. 2 is a flow chart of the construction of the present invention;
FIG. 3 is a general flow chart of the embodiment of the integrated translation and jacking construction for remote protection;
FIG. 4 is a side elevational view of the integral reinforcement of the embodiment;
FIG. 5 is a detailed view of an embodiment wall (column) beam;
FIG. 6 is a schematic view of an embodiment of a steel channel beam of a basement;
FIG. 7 is a detailed view of a hydraulic suspension runner of an embodiment;
FIG. 8 is a schematic cross-sectional view of an embodiment underpinning chassis;
FIG. 9 is a cross-sectional view of an embodiment of a push reaction abutment;
FIG. 10 is a schematic view showing the arrangement of a limiting block, a jacking jack and a range-changing block according to the embodiment;
in FIG. 1, A is a major steel beam in the longitudinal direction, B is a minor steel beam in the short direction, and C is a minor steel beam.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings so that the technical solution of the invention can be better understood.
The invention relates to a profile steel tray structure for translation of an ancient building, which comprises a plurality of long main steel beams, short main steel beams and secondary steel beams which are welded with one another and are arranged according to the concrete structure of the ancient building, wherein the plurality of steel beams are welded to form a complete tray structure. As shown in fig. 1, there is one type of the section steel pallet structure, and since the section steel pallet structure needs to be designed according to the construction of a specific building, its external shape may have various forms, of which fig. 1 is only one.
The construction sequence of the section steel structure pallet beam is as follows: processing a steel structure beam, customizing → layering, excavating soil in sections, digging holes → spacing, installing prestressed steel buttresses in batches → excavating soil, digging holes, perforating in batches, installing a steel structure tray beam → welding the tray beam, combining the steel structure tray beam into a whole, arranging a temporary jack top support → excavating and excavating a wall, residual soil under column foundation barred rocks, stones → indoor concrete track beam foundation leveling, pouring a cushion layer, binding reinforcing steel bars, installing a template, pouring concrete and maintaining to design strength → mounting of a suspension plate → installation of a hydraulic jack system → underpinning of a PLC synchronous jacking system → removal of a steel structure tray beam → manual jacks.
The underpinning method of the profiled bar tray structure for the translation of the historic building adopts the construction principle of batch and subsection symmetrical construction, and simultaneously enhances the monitoring in the underpinning construction, and specifically comprises the following steps: 1) designing the specification and the size of a steel beam according to the concrete structure of an ancient building, customizing and processing the steel beam in a factory, transporting the steel beam to a construction site, and hoisting the steel beam to a specified material stacking area by using an automobile crane; 2) the underpinning of the columns and the wall bases of the historic buildings adopts a manual local excavation and excavation mode to carry out batch and sectional excavation underpinning, the excavation and the underpinning are carried out simultaneously, the excavation depth is the height of a steel beam, the cross-inner area is firstly excavated in layers to meet the design depth requirement, the design depth requirement is 1320-1340mm, and 1330mm is preferred; 3) digging holes and earth at the positions where the prestressed steel buttresses under the wall and the column foundation barred rocks are arranged, wherein the digging width is preferably less than 500mm, the digging depth is the height of the steel buttresses and the height of a jack, each hole is immediately provided with a prestressed underpinning steel buttress to prop against the barred rocks, and the prestressed underpinning steel buttresses are dug and arranged one by one; 4) after the prestressed underpinning steel buttress is installed, digging wall and column foundation barred rock steel beam installation holes one by one, digging steel beam installation holes one by one, wherein the digging width of each steel beam installation hole is less than 500mm, the digging depth is the height of each steel beam, after one steel beam installation hole is dug, immediately perforating and installing steel beams from the outer side to the inner side, installing a long main steel beam firstly, the height of the long main steel beam is 400mm, and arranging a temporary jacking jack to jack the steel structure pallet beam tightly so that the steel structure beam plays a role of bearing the wall and the column foundation barred rock; after the long main steel beam is installed, digging short main steel beam installation holes in the same mode, installing short steel beams, machining and disconnecting the connection parts of the short steel beams and the long main steel beam in advance, adopting on-site welding and splicing, ensuring that the welding quality meets the standard requirements, welding and splicing the short steel beams into a whole, then encrypting a jack, digging holes in the mode, installing secondary steel beams, keeping the height of the secondary steel beams to be 250mm or 200mm, keeping the steel beam surface horizontal, welding the secondary steel beams and the long main steel beam into a whole, and encrypting the jack; 5) after the steel structure pallet beam completely supports the upper structure, manually and sectionally digging and excavating the residual soil and the rock blocks under the wall and the column foundation barred rocks; 6) leveling an indoor concrete track beam foundation, paving broken stones, pouring a cushion layer, binding reinforcing steel bars, arranging embedded parts, installing a template, pouring concrete and maintaining to the designed strength; 7) the height of the concrete track beam is 300mm, the width of the concrete track beam is 800 or 1600mm, C25 concrete is poured, and the concrete curing time is not less than 15 days; 8) mounting a suspension steel plate on the surface of the concrete track beam, and fixing the suspension steel plate and the embedded part in a spot welding manner; 9) and (3) polishing the surface of the suspension steel plate, coating butter, installing hydraulic jacks according to a design preset point, after all the hydraulic jacks are installed, synchronously loading and jacking the tray beam by adopting a PLC synchronous jacking system, so that each set of hydraulic jack is uniformly stressed, removing temporary manual jacks one by one symmetrically and in batches, completing zero-sensing load conversion, and completing the installation of the tray beam system. The construction flow chart is shown in fig. 2, wherein A is excavation and prestressed steel buttress hole excavation, B is prestressed steel buttress batch installation, C is underpinning steel beam installation hole excavation, D is underpinning steel beam batch perforation installation, E is excavation and removal of residual soil and rock blocks under walls and column foundation barrettes, F is concrete track beam construction, G is hydraulic jack installation, and H is a PLC synchronous underpinning and conversion jack.
In the underpinning method, during the excavation, hole digging and underpinning construction of each part, careful monitoring work needs to be done to ensure that the construction of each procedure is in a safe and controllable range; fireproof protection and monitoring measures need to be taken during welding, and gas cutting operation is prohibited to be arranged indoors; and the wall and column foundation wall clamping beam is reinforced and protected before the underpinning beam is installed.
Example (b): lianling village-based Taimen protection engineering in Shengzhou city
Arranging the overall construction sequence: before the translation construction of the engineering, indoor and outdoor non-main structural members are removed by cultural relic repair and protection construction units, and the construction comprises concrete floor chiseling, non-bearing stone removing, floor block stone removing and the like. The structure translation and jacking construction are divided into three large contents, the first part is the structure underpinning structure, the track beam and the new foundation construction, the second part is the structure translation, the third part is the structure jacking, the underpinning system removal and the foundation recovery, and the engineering foundation is a table door remote protection integral translation and jacking construction general flow chart shown in figure 3.
Integral protection and reinforcement for house
1) Principle of reinforcement
The house construction age is long, and the structure is preserved betterly, because of the building is traditional timber structure building, lifts the roof beam and wears fill convolution bearing structure, connects between each component and to have not hard up, and the rigidity and the overall stability of structure itself are all relatively poor moreover, for guaranteeing that translation, jacking in-process building have sufficient security, should strengthen building stability, wholeness and overall rigidity.
The reinforcing measures are all temporary, and the purpose is to protect the cultural relic building from structural damage in the translation and jacking processes. After the horizontal moving and jacking in-place reinforcing measures are removed, the components of the cultural relic building can keep the original appearance, and the value of the cultural relic is not damaged. Therefore, the reinforcement measures should be carried out on the premise of not damaging the appearance of the member and ensuring safety and stability.
2) Reinforcement scheme
The temporary integral reinforcement of the engineering main structure adopts a steel groove plate reinforcement method for reinforcing the upright posts and the root of the wall body and a steel pipe truss system reinforcement method for protecting the upper structure. The steel clip beams are arranged at the roots of the upright columns and the wall body by adopting channel steel beams to be attached to two sides of the wall or at the feet of the upright columns, the steel clip beams are arranged to clamp the footings and the barred stones below the footings, the gaps among the columns, the wall base and the steel clip beams are externally attached with plastic films and then filled with grouting materials for filling, the lug plates welded on the two steel beams (welded in advance) are connected and fixed by adopting screws, and the grouting materials are firstly filled in the wall when meeting the wall and are fixed by penetrating the wall. The upper structure adopts phi 48 multiplied by 3.2-3.5 mm steel pipe frames to temporarily reinforce, the connection between scaffold steel pipes is standardized connection installation, the quality is easy to guarantee, and the node friction strength can meet the force generated by translation, vibration and shaking during jacking. The post wraps the cystosepiment outward, and the plank sheathing pastes the cystosepiment outer nail and establishes the wooden box fixed, and the wall body pastes along the wall and establishes the cystosepiment, and the cystosepiment subsides are established the plank sheathing, and each horizontal end of steel-pipe frame adopts jackscrew top tight plank side of setting outside the plank sheathing stupefied, and the inside and outside scaffold of wall body link up at door and window entrance to a cave position, and the drawknot becomes whole. The local concave-convex part is fixed by adopting a wood keel and a wood board. The door and window opening and the indoor wall-free column are fastened by adopting an X-shaped tie formed by steel wire ropes. A side elevational view of the integral reinforcement of this embodiment is shown in fig. 4.
Integral reinforcing and protecting construction for column and wall
And (3) column reinforcement protection construction: for realizing the whole underpinning of column base, this engineering column base sets up double-layered wall roof beam, connects into a whole with each independent column base, sets up the steel pipe frame integral stay in the peripheral and positive hall of major structure and connects, specifically does:
1) the column base wall clamping beam adopts a [32b # channel steel beam to be attached to a column foot to be provided with a steel clamping beam, the steel clamping beam is clamped and replaced together with a foundation cushion bar stone below the column foot when being arranged, a 10-thick steel batten plate is arranged below the channel steel beam and is welded and fixed with channel steel at the interval of 500mm, a 12-thick lug plate at the interval of 500mm is welded at the upper end of the channel steel beam in advance, a screw hole is reserved in the lug plate, and M16 (4.8 grade) screw rods are adopted for opposite-pulling connection and fastening;
2) after the steel clip beam under the column and the steel clip beam under the wall are installed, welded and connected into a whole, a plastic film is pasted outside gaps among the clip beam, the column foundation barred rocks and the column top rocks, C40 grouting material is poured, and watering and maintenance are carried out;
3) the plastic film is coated outside the column body, the column body is attached with the foam board, the foam board is nailed outside the foam board to form a wood template, so that a protective square column is formed, and the foam board can be attached to the wood template in advance to facilitate installation;
4) after the columns, the wall foundation reinforcement and the wall wood-wrapped formwork protection are completed, a steel pipe frame for protection is erected, the vertical foot points of the steel pipe frame are erected on underpinned steel beams by adopting wood cantilever plates or 14# channel steel, the space between the vertical rods of the steel pipe frame is 800 multiplied by 800mm, the step pitch is 1200mm, 5 vertical rods at the vertical surface space outside the steel pipe frame are provided with a pair of cross braces, 5 vertical rods at the space inside the steel pipe frame are provided with a pair of two-way cross braces, and each transverse end of the steel pipe frame is tightly propped against a wood square ridge arranged outside a wood formwork by;
5) the height of the indoor steel pipe frame in one layer is 300-500 mm below the bottom of the two-layer plate, so that the steel pipe frame is prevented from colliding with the two-layer floor slab during installation; the installation height of the outdoor protection pipe frame is about 800mm upwards from the highest point of the ridge, and falling objects or steel pipes are prevented from colliding roof facilities such as roof tiles, kwan-yin bags and the like when the outdoor protection pipe frame is erected; the second-layer chamber is not provided with a steel pipe frame;
6) a phi 16 steel wire rope is obliquely pulled between the first layer of column and the second layer of column, and the blanket cloth is covered on the point where only the steel wire rope is pulled to protect the second layer of column. The column clamp column beam is shown in detail in fig. 5.
Wall body reinforcing protection construction: wall body reinforcement protection wall base sets up double-layered wall roof beam, and the wall body sets up steel pipe frame and joins in marriage template, cystosepiment and pastes wall protection and support, specifically is:
1) the wall foundation wall clamping beam adopts a [32b # channel steel beam to be attached to two sides of a wall foot and is provided with a steel clamping beam, the steel clamping beam is clamped and replaced together with a base cushion strip stone below the wall foot when being arranged, a 10-thick steel batten plate is arranged below the channel steel beam and is welded and fixed with channel steel at the interval of 500mm, a 12-thick lug plate at the interval of 500mm is welded at the upper end of the channel steel beam in advance, a screw hole is reserved in the lug plate, and the wall penetrating opposite-pulling connection is fastened by adopting an M16 (4.8 grade) screw;
2) after the lower wall steel beam and the lower column steel beam are installed and welded into a whole, the clamping beam, the wall foundation strip stone and the gap at the wall foot are externally pasted with a plastic film, then C40 grouting material is poured, and watering and maintenance are carried out;
3) the steel pipe frame is arranged as above, when the formworks and the wood ridges on the two sides of the wall body are constructed, firstly, foam boards are arranged on the two sides of the wall body in a sticking mode or the foam boards are stuck on the formworks in advance, the formworks are arranged, the formworks on the two sides are fixed by the relatively high gable by adopting the split bolts, and then the longitudinal and transverse square ridges outside the formworks are placed; after the rest wall formworks are placed, only the longitudinal and transverse square ridges on the outer sides of the formworks are adopted for fixing, and the formworks and the square ridges are firmly nailed by an air nail gun. The construction sequence of the template is from bottom to top, and the inside and the outside are correspondingly constructed simultaneously;
4) and (5) tightly supporting the formworks at two sides of the wall body. After the formworks and the square ridges on the two sides of the wall are placed, each transverse end of the scaffold tightly pushes the wood ridge arranged outside the wood formwork by adopting a jackscrew. The schematic view of the steel channel beam of the basement is shown in figure 6.
Brick carving on upper part of door opening and gable protection measure
The courtyard wall is built by bricks, the wall gate is provided with a stone-type storeroom door, and a door head is decorated with a gray-plastic pattern.
The door lintel gray plastic and the gable cultural relics have high values, and the gable is easy to incline integrally, so that important reinforcement protection is required before migration. The reinforcing measure is the same as the integral reinforcing measure of the wall body, but the two parts of the outer part are uneven, and if the two parts of the outer part are directly contacted with the template, the two parts of the outer part can collide with each other to cause the damage of cultural relics, so that the foam board layer arranged between the outer surface and the template needs to be arranged densely and finely, and the foam board layer can reliably play a role in buffering.
Besides the steel pipe frame is arranged to be pulled through, a phi 16 steel wire rope is obliquely pulled at the opening part of the door or the window, so that the structural integrity is improved.
And (3) carrying and replacing construction of columns and walls: the bearing column of the foundation forming table door wood structure is a round wood column, the foundation barred rock under the column, the pillar top rock, the pillar body and the pillar top carved bracket are completely stored, and the translation construction needs to underpin the structural foundation. The underpinning construction principle is batch and subsection symmetrical construction, and the monitoring in the underpinning construction needs to be enhanced, and the method comprises the following steps:
1) the column and wall foundation underpinning adopts a manual local excavation and excavation soil mode to carry out batch and sectional excavation underpinning, the excavation depth is the height of a steel beam, the cross-inner area is excavated in layers to meet the design depth requirement, the design depth requirement is 1320 and 1340mm, and 1330mm is preferred;
2) digging holes and earth at the positions where the prestressed steel buttresses under the wall and the column foundation barred rocks are arranged, wherein the digging width is preferably less than 500mm, the digging depth is the height of the steel buttresses and the height of a jack, each hole is immediately provided with a prestressed underpinning steel buttress to prop against the barred rocks, and the prestressed underpinning steel buttresses are dug and arranged one by one;
3) after the prestressed underpinning steel buttress is installed, digging wall and column foundation barred rock steel beam installation holes one by one, digging steel beam installation holes one by one, wherein the digging width of each steel beam installation hole is less than 500mm, the digging depth is the height of each steel beam, after one steel beam installation hole is dug, immediately perforating and installing steel beams from the outer side to the inner side, installing a long main steel beam firstly, the height of the long main steel beam is 400mm, and arranging a temporary jacking jack to jack the steel structure pallet beam tightly so that the steel structure beam plays a role of bearing the wall and the column foundation barred rock; after the long main steel beam is installed, digging short main steel beam installation holes in the same mode, installing short steel beams, machining and disconnecting the connection parts of the short steel beams and the long main steel beam in advance, adopting on-site welding and splicing, ensuring that the welding quality meets the standard requirements, welding and splicing the short steel beams into a whole, then encrypting a jack, digging holes in the mode, installing secondary steel beams, keeping the height of the secondary steel beams to be 250mm or 200mm, keeping the steel beam surface horizontal, welding the secondary steel beams and the long main steel beam into a whole, and encrypting the jack;
4) the steel beam underpinning sequence is that the steel beams are installed in batches from the serial number 1 to 6 according to the requirement of a later attached figure 1 and are connected in a sectional welding mode;
5) after the steel structure pallet beam completely supports the upper structure, manually and sectionally digging and excavating the residual soil and the rock blocks under the wall and the column foundation barred rocks;
6) leveling an indoor concrete track beam foundation, paving broken stones, pouring a cushion layer, binding reinforcing steel bars, arranging embedded parts, installing a template, pouring concrete and maintaining to the designed strength;
7) the height of the concrete track beam is 300mm, the width is 800 or 1600mm, C25 concrete is poured, and the curing time is not less than 15 days;
8) mounting a suspension steel plate on the surface of the concrete track beam, and fixing the suspension steel plate and the embedded part in a spot welding manner;
9) polishing the surface of the suspension steel plate, coating butter, installing hydraulic jacks according to a designed preset point position, adopting a PLC synchronous jacking system to synchronously load and jack the tray beam tightly after all the hydraulic jacks are installed, enabling each set of hydraulic jacks to be uniformly stressed, and removing temporary manual jacks one by one symmetrically and in batches to complete zero-sensing load conversion and the tray beam.
Note that: fireproof protection and monitoring measures need to be taken during welding, and gas cutting operation is prohibited to be arranged indoors; and the wall and column foundation wall clamping beam is subjected to reinforcement and protection construction before the underpinning beam is installed, and the main structure steel pipe frame and the template reinforcement and protection measures are set after the underpinning beam is installed.
Excavating earthwork: the indoor earthwork excavation of the project adopts manual excavation, and the outdoor earthwork excavation adopts small excavator excavation and manual soil repair.
1) The method comprises the following steps that the earthwork of an indoor underpinned steel beam is excavated by adopting a manual excavation method, before excavation, an excavation line is calibrated according to the installation sequence of the underpinned steel beams, then subsection excavation is carried out, the excavation depth is the height of the steel beams, the excavation width is preferably smaller than 800mm, the trench excavation length is the installation range of the length direction of the steel beams, excavation needs to be carried out while protecting upper structural members, excavation is carried out slowly, structural change of the members is concerned in real time, and structural monitoring is carried out;
2) digging out earthwork, bagging and transporting the earthwork to an outdoor designated place in time for stacking, and transporting the earthwork in time, wherein the earthwork can not be stacked indoors;
3) after the load of the upper structure is converted to the underpinned beam, the residual soil below the underpinned beam can be manually unfolded and excavated to the surface of the track beam pad, and macadam and cushion concrete are paved and poured in time. Removing the rock blocks under the wall, and recovering the rock blocks by professional units in the later stage of storage;
4) excavating earth of outdoor track beams and new site raft foundations by using a small excavator until 50-100 mm of earth is left on the surface of a foundation bed, manually repairing the earth, paving broken stones in time after repairing the earth to the surface of the bed, and pouring C15 bed concrete;
5) the outdoor earthwork truck is used for clearing and transporting without bagging and is not ultrahigh and overweight for stacking.
Constructing a track beam and a new site foundation: the engineering translation track beam adopts a reinforced concrete beam, and the new site foundation is a reinforced concrete raft plate foundation.
1) After the track beam and the new site foundation are positioned and lofted according to a design drawing, the outdoor foundation earthwork adopts small mechanical excavation combined with manual soil repair, the concrete grade of a cushion layer is C15, and the cushion layer surface needs to be leveled and leveled;
2) the cushion concrete surface is positioned in a springline mode, the track beams JC1 and JC2 steel bars are configured according to a lower node diagram, the thickness of a new site foundation plate is 250mm, the plate steel bar double-layer bidirectional phi 10@200 is adopted, and the steel bars adopt HRB 400-level hot rolled steel bars;
3) after the steel bars are installed, a template is erected, the elevation of the template surface is leveled by a precision level, foundation concrete is poured, the concrete strength grade C25 is achieved, the concrete surface is polished and smoothed in multiple times according to the template surface, the elevation is leveled in real time by the precision level, the polished and smoothed surface is guaranteed, and the concrete is maintained for at least 15 days.
Hydraulic suspension type sliding foot and counter-force steel corbel installation
1) The method is characterized in that a steel plate strip with the thickness of 8mm is installed on the surface of a track beam, the surface of the steel plate is required to be flat (the allowable deviation is +/-2 mm, and the integral height difference is not more than 5.0 mm), and the steel plate can be installed by reserving reinforcing steel bars for spot welding and fixing during concrete beam pouring or fixing after leveling high-strength polymer mortar;
2) the total number of the hydraulic suspension type sliding feet is 122, the mounting parts of the sliding foot jacks are positioned according to design requirements, the specifications of the jacks are 30T, a 12mm thick steel plate is arranged above and below each jack, and the hydraulic suspension type sliding feet are welded or bonded with the jacks to form a whole, and are shown in detail in figure 7.
3) After the hydraulic suspension type sliding foot is completely installed, the hydraulic suspension type sliding foot is welded and fixed with the underpinning beam above, and a short connecting column is arranged in a vacant space in the height range;
4) the jack is connected with a PLC synchronous hydraulic control system, a debugging jack and equipment, a structure is arranged to protect the steel pipe frame, a steel wire rope is pulled, and a counter-force steel corbel is installed;
5) setting and limiting: in the translation process of the house building, due to the differences of equipment installation, construction level, control precision and control means, the actual moving track of the house building always has certain deviation from the theoretical track line, and the smoothness of the translation is often influenced if the deviation is not limited or corrected. In addition, in order to prevent the building from being unstable due to other horizontal loads such as wind and earthquake in the jacking process, a steel frame is required to be arranged for limiting the building, as shown in fig. 8;
6) the steel and steel in the counter-force steel bracket are connected by groove full penetration welding, the quality grade of a welding line is not lower than that of the second grade, the material quality of the section steel is Q355b, and the implantation depth of a chemical anchor bolt is 10 d;
7) after the structure protection is completed, the hydraulic jack is synchronously constructed and pre-jacking force is applied to weigh the upper structure, and the structural load borne by the original steel buttress and manual jack system is completely converted into the synchronous hydraulic jack system.
Pushing and translating: the translation mode of the upper structure of the engineering is realized by a pushing translation mode, and the translation is divided into two stages, wherein the first stage translates to the west by about 13.562m, and the second stage translates to the north by about 39.391 m. The translational reaction force bearing diagram is shown in fig. 9.
1) The model of the pushing jack adopts SCRG-100-500-T, rated thrust: 1000kN, and the pushing stroke is 500 mm;
2) the jacking jacks are connected with a PLC synchronous hydraulic control system, so that each jack can realize synchronous jacking translation, the jacking system is debugged in place after being installed, and jacking translation can be started after all preparations are finished;
3) the pushing translation is completed in multiple strokes, the maximum stroke of each pushing of the jack is 500mm, each pushing jack realizes computer connection real-time synchronous pushing through a PLC synchronous control system, the translation amount of each point is ensured to be the same, and each stroke of pushing is completed by arranging a steel pipe cushion for lengthening;
4) because the translation distance is longer, need reset the counter force support after every about 5 meters of removal, the first stage sets up northward translation counter force support after accomplishing according to design translation distance translation, repeats above step until the second stage is accomplished according to design translation distance translation.
Jacking: after the project is translated to the new foundation in place, the connection between the hydraulic suspension type sliding foot jack and the upper steel plate is released, and the jacking height (the design is temporarily set to be 1 m) is determined.
1) The jacking jack uses the original shifting hydraulic suspension type sliding foot jack, but needs to be installed upside down again, the jack base is fixed at the bottom of the underpinning beam, is connected with the PLC synchronous hydraulic control system through a hydraulic oil way, and is debugged whether the jack and the PLC hydraulic control system work normally or not;
2) the PLC synchronous hydraulic control system carries out multi-stroke synchronous range-changing jacking to be in place, and the maximum jacking stroke of the jack is 170mm each time;
3) setting a phi 168 multiplied by 10 range-changing steel cushion block at the position of the design marking plane every time a stroke is finished;
4) the jack slowly and synchronously releases pressure, the upper structure is shifted to a steel cushion block, the steel cushion block is additionally arranged under the jack, the jack is synchronously pressurized and jacked for a stroke, the shifting steel cushion block is additionally arranged, the pressure and the stroke are slowly and synchronously released and shifted, and the jack is repeatedly shifted and jacked to the designed elevation to be in place. The limiting block, the jacking jack and the range-changing block are arranged in a large scale as shown in figure 10.
Removing the underpinning beam: dismantling underpinned beams in batches, wherein the dismantling sequence is as follows: the underpass of the non-bearing member underpass section underpass beam → column underpass beam is dismantled and removed in two batches at intervals, the jack system is removed → the brick wall is built in batches according to the previous step → whitewash.
1) Firstly, removing the underpinning beams of all spans in the middle section, wherein the underpinning beams cannot be removed by adopting gas cutting equipment, fire prevention measures are required to be specially made during the cutting construction, the fire safety is strictly controlled, after one section of underpinning beam is removed, a 240-thick MU15 shale standard brick wall is immediately built for filling (the step is carried out while the step is removed), M10 cement mortar is built, C40 grouting material with the thickness of 100mm is poured at the top, and the brick building and maintaining time is about 7 days;
2) curing the first batch of brick mortar to strength, removing the jack (steel cushion block) under the column at intervals, dismantling the batch of underpinned beams, immediately building brick walls for filling, and pouring grouting material at the top;
3) curing the second batch of brick mortar to strength, removing the rest of the jack (steel cushion block) under the column, dismantling the batch of underpinning beams, immediately building brick walls for filling, and pouring grouting material at the top;
4) plastering a 20mm thick cement mortar waterproof surface layer on the outer surface of the brick wall;
5) and after the underpinning beam under the wall is removed, recovering the piled block stone foundation by a professional unit.
Claims (7)
1. The utility model provides a ancient building shaped steel tray structure for translation, this tray structure of its characterized in that includes according to the concrete structure of ancient building and many mutual welded long to main girder steel (A), short to girder steel (B) and time girder steel (C), constitutes complete tray structure after many girder steel welding accomplish.
2. The underpinning method of the section steel tray structure for the translation of the historic building is characterized in that the underpinning method adopts the construction principle of batch and subsection symmetrical construction, and simultaneously enhances the monitoring in the underpinning construction, and specifically comprises the following steps:
1) designing the specification and the size of a steel beam according to the concrete structure of an ancient building, customizing and processing the steel beam in a factory, transporting the steel beam to a construction site, and hoisting the steel beam to a specified material stacking area by using an automobile crane;
2) the underpinning of the columns and the wall bases of the historic buildings adopts a manual local excavation soil-excavating mode to excavate and underpin batches and sections, the excavation is carried out while the underpinning is carried out, the excavation depth is the height of a steel beam, and the cross-internal area is excavated in layers to meet the design depth requirement;
3) digging holes and earth at the positions where the prestressed steel buttresses under the wall and the column foundation barred rocks are arranged, immediately installing a prestressed underpinning steel buttress to prop against the barred rocks after digging each hole, and digging and installing the prestressed underpinning steel buttresses one by one;
4) after the prestressed underpinning steel buttress is installed, digging wall and column foundation barred rock lower steel beam installation holes one by one, after one steel beam installation hole is dug, immediately perforating and installing a steel beam from the outer side to the inner side, firstly installing a long main steel beam, arranging a temporary jacking jack to jack the steel structure tray beam tightly, and enabling the steel structure beam to play a role of bearing the wall and the column foundation barred rock; after the long main steel beam is installed, digging short main steel beam installation holes in the same mode, installing short steel beams, machining and disconnecting the connection parts of the short steel beams and the long main steel beam in advance, adopting on-site welding and splicing, enabling the welding quality to meet the standard requirements, welding and splicing into a whole, then encrypting a jack, digging holes in the mode, installing secondary steel beams, keeping the steel beam surface horizontal, welding the steel beam surface and the long main steel beam into a whole, and encrypting the jack;
5) after the steel structure pallet beam completely supports the upper structure, manually and sectionally digging and excavating the residual soil and the rock blocks under the wall and the column foundation barred rocks;
6) leveling an indoor concrete track beam foundation, paving broken stones, pouring a cushion layer, binding reinforcing steel bars, arranging embedded parts, installing a template, pouring concrete and maintaining to the designed strength;
7) the height of the concrete track beam is 300mm, the width is 800 or 1600mm, and C25 concrete is poured for curing;
8) mounting a suspension steel plate on the surface of the concrete track beam, and fixing the suspension steel plate and the embedded part in a spot welding manner;
9) and (3) polishing the surface of the suspension steel plate, coating butter, installing hydraulic jacks according to a design preset point, after all the hydraulic jacks are installed, synchronously loading and jacking the tray beam by adopting a PLC synchronous jacking system, so that each set of hydraulic jack is uniformly stressed, removing temporary manual jacks one by one symmetrically and in batches, completing zero-sensing load conversion, and completing the installation of the tray beam system.
3. The method for underpinning a section steel tray structure for horizontal movement of ancient buildings as claimed in claim 2, wherein the design depth requirement in step 2) is 1320-1340 mm.
4. The method for underpinning a section steel pallet structure for horizontal movement of ancient buildings according to claim 2, wherein the excavation width in step 3) is less than 500mm, and the excavation depth is the height of the steel buttress and the jack.
5. The method for underpinning a section steel pallet structure for horizontal movement of ancient buildings according to claim 2, wherein the digging width of the steel beam mounting hole in the step 4) is less than 500mm, and the digging depth is the height of the steel beam.
6. The method for underpinning a section steel pallet structure for horizontal movement of ancient buildings according to claim 2, wherein in the step 4), the height of the longitudinal main girder is 400mm, and the height of the minor girder is 250mm or 200 mm.
7. The method for underpinning a section steel pallet structure for horizontal movement of ancient buildings according to claim 2, wherein the concrete curing time in step 7) is not less than 15 days.
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