CN111827343A - Construction method for deepening four-wall support of existing building elevator foundation - Google Patents
Construction method for deepening four-wall support of existing building elevator foundation Download PDFInfo
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- CN111827343A CN111827343A CN202010736103.XA CN202010736103A CN111827343A CN 111827343 A CN111827343 A CN 111827343A CN 202010736103 A CN202010736103 A CN 202010736103A CN 111827343 A CN111827343 A CN 111827343A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/44—Foundations for machines, engines or ordnance
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/40—Miscellaneous comprising stabilising elements
Abstract
The invention relates to a construction method for deepening four-wall support of an existing building elevator foundation, and belongs to the technical field of elevator reinforcement. The method comprises the steps of carrying out static cutting of an opening on the four walls of the original elevator according to the elastic outer side lines, perforating and forming holes on the basis of the original peripheral structure of the four walls of the original elevator at the position of a steel plate under an installation column base, installing steel columns and steel beams, observing settlement and the like. According to the invention, the holes are formed in the four walls of the original elevator, the steel beams are erected, the load on the upper parts of the four walls of the elevator directly acts on the steel structure support system, full framing does not need to be erected layer by layer, the construction or normal use of the upper building is not influenced, the elevator is convenient and rapid, materials are saved, the cost is reduced, the plane area occupied by the support system is reduced, and the construction progress is accelerated.
Description
Technical Field
The invention relates to a supporting method, in particular to a construction method for deepening four-wall support of an existing building elevator foundation, and belongs to the technical field of elevator reinforcement.
Background
At present, with the rapid development of economy, the living standard of people is improved, and the requirements on environments such as residence, office and the like are higher and higher. The development goal of 'reevaluation, renewability, reusability, recyclability, energy consumption reduction and pollution' advocated by the nation is that the old building reconstruction and reuse is a specific practice of the '5R' idea in the ecological concept. Therefore, more and more old buildings are required to modify the use function and the decoration of the old buildings.
The bearing structure system can bear the load that passes down of elevator well four walls, just can demolish the basis, and the construction of general support system supports on roof beam, the board around the elevator four walls, adopts full hall scaffold, and if former elevator well number of piles is more, the load that passes down of elevator well four walls can not be born to one deck support system, also supports at upper building floor, has following defect to this present this kind of support system:
(1) the full scaffold has the advantages of large supporting material consumption, large workload, high purchase and lease cost, long construction period and increased construction cost;
(2) the upper building floors are supported, scaffolds are erected layer by layer to unload, construction space is occupied, the supporting system is not dismantled, all the floors of the upper building cannot be constructed or normally used, construction period cannot be guaranteed, and the occupied space range of the supporting system is large.
In addition, in the prior art, CN203741872U discloses a structure for transforming an elevator shaft by using stiff beams, which comprises an original elevator shaft wall column and an original elevator shaft raft foundation, wherein the original elevator shaft raft foundation is arranged below the original elevator shaft wall column, and a column-covered supporting beam is connected with the original elevator shaft wall column; wrapping post underpins roof beam both ends and is equipped with artifical cut pile, artifical cut pile bottom is equipped with newly-increased elevator shaft raft foundation, it has shortened construction cycle to a certain extent, environmental pollution has been reduced, but it is owing to newly-increased artifical cut pile, newly-increased elevartor shaft wall post and underpins the process of jacking, thereby lead to construction cost to improve, the time limit for a project increases, and because wrapping post underpins 2 single structures of roof beam, thereby it is inhomogeneous to underpinning stability and intensity of elevator four walls when making whole underpinning, probably lead to the inhomogeneous problem of load transmission. In addition, a large amount of formwork and supporting materials are required due to the increase of the manual dug piles. Therefore, the elevator remodeling structure is not practical.
Therefore, the existing construction support system has high construction cost, cannot guarantee the schedule of the construction period, and has large occupied space range, so that the problem to be solved urgently at present is solved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a construction method for deepening four-wall support of an existing building elevator foundation, which is used for solving the problems that an existing construction support system is high in construction cost, cannot guarantee the progress of a construction period and is large in occupied space range of the support system.
In order to solve the technical problems, the invention adopts the following technical scheme:
the construction method for deepening four-wall supports of the existing building elevator foundation comprises the following steps:
the method comprises the following steps: designing and calculating specification models of steel beams and steel columns used by a steel structure supporting system and plane positions and elevations of the steel beams and the steel columns relative to the four walls of the original elevator according to the bearing capacity of the foundation of the rest part after the elevator foundation is dismantled, the upper load, the local compression bearing capacity of the original wall body of the elevator at the position of the opening and the anti-cutting capacity of the original structure foundation under the steel columns; checking the soil quality of the existing building foundation pit of the investigation report, and calculating the stability of the soil body of the existing building foundation pit according to the depth of the foundation pit and the slope setting requirement;
step two: positioning and paying-off measurement is carried out by utilizing a theodolite, a leveling instrument and a steel tape, and a steel beam mounting outer side line, a steel column outer side line and a steel column underfoot steel plate outer side line are popped out from the four walls of the original elevator by using ink lines;
step three: performing static cutting on the four walls of the original elevator according to the elastic outer side lines to cut out a hole for mounting the steel beam;
step four: drilling holes on the basis of the original elevator four-wall peripheral original structure at the position where the lower column base steel plate is installed, implanting a column base anchor bolt with bar planting glue, installing the lower column base steel plate, and fixing steel columns on the lower column base steel plate; the steel beams penetrate through the openings and are installed on the tops of the steel column columns on two sides of the four walls of the original elevator in a crossing mode, and the steel beams are fixed; the upper flange of the steel beam is in close contact with the four walls of the original elevator, if a gap appears due to construction deviation, wedge-shaped steel plates with the thickness of 0.5-10 mm are tightly packed at two sides of the shear wall of the four walls of the original elevator, so that the load at the upper part is ensured to be uniformly downloaded;
step five: arranging stiffening ribs at the top of the steel column and the end part of the steel beam, wherein one end of each stiffening rib is connected with the web of the steel column, and the other adjacent end of each stiffening rib is connected with the lower flange of the steel beam; meanwhile, stiffening ribs are also arranged at the inner corners of the connection between the steel columns and the steel beams;
step six: the steel columns, the steel beams, the stiffening ribs and the steel plates under the column feet form a group of steel structure supporting systems, and the multiple groups of steel structure supporting systems are sequentially arranged in a transverse and longitudinal mode in a crossed mode, so that a grid-shaped steel structure supporting system is formed;
step seven: connecting support rods are arranged at the upper ends of the outer sides of the steel columns, so that the steel columns in all directions of a plurality of groups of steel structure supporting systems are welded together, and the integral reinforcing effect is achieved;
step eight: arranging settlement observation points at four corners of an outer wall of the four walls of the original elevator respectively, and arranging horizontal displacement and vertical displacement monitoring points on each side of the periphery of an existing building foundation pit where the four walls of the original elevator are located; recording original data of settlement, horizontal displacement and vertical displacement; relevant organization personnel check and accept the steel structure supporting system, and can dismantle and excavate the original structure foundation in the four walls of the original elevator according to the drawing requirements after meeting the requirements;
step nine: binding reinforcing steel bars in the newly excavated foundation pit, pouring expansive concrete to form a newly poured concrete foundation, and allowing the steel structure supporting system to be removed when the strength of the concrete reaches over 100 percent.
Further, in the first step, the plane positions and elevations of the steel beams and the steel columns relative to the four walls of the original elevator comprise: the mounting height of the steel beam and the distance between the steel column and the four walls of the original elevator are the same; designing the specification, the model and the spacing of the connecting support rods among the steel columns according to the height of the steel columns; the location of the stiffeners and the materials used are designed.
Further, the thickness of the steel plate under the column base is not less than 2 cm.
Further, in the fourth step, fixing a steel column on the steel plate under the column base, checking the plane position and the verticality of the steel column, and connecting the steel column and the steel plate under the column base by adopting a continuous fillet weld after the requirements are met, wherein the height of the weld is required to meet the design requirements; and (3) mounting the steel beam on the top of the steel column, checking the mounting position and the elevation of the steel beam, fixing the steel beam after the mounting position and the elevation meet the requirements of the drawing, wherein the steel beam is connected with the steel column in a welding manner, and the height of a welding line meets the requirements of the drawing.
Furthermore, the thickness of the stiffening rib is not less than 10mm, and the stiffening rib is connected with the steel beam and the steel column in a welding mode.
Further, in the step eight, before the original structure foundation is excavated, an ink line is used for popping up an outer side line, a concrete cutting machine is used for cutting, and then the foundation pit earthwork is excavated manually; during excavation and before concrete poured in the foundation pit reaches the designed strength, the original elevator four walls and the foundation pit peripheral original structure foundation are detected according to a detection scheme, the stability of a side slope soil body is observed, then holes are punched in the original elevator four walls corresponding to the original structure foundation, and reinforcing steel bars are implanted.
Furthermore, a stiffening rib is also arranged at the steel beam in the opening.
Compared with the prior art, the invention has the following technical effects:
according to the invention, the holes are formed in the four walls of the original elevator, the steel beams are supported, the load on the upper parts of the four walls of the elevator directly acts on the steel structure support system, full framing does not need to be built layer by layer, the construction or normal use of the upper building is not influenced, the method is convenient and rapid, materials are saved, the cost is reduced, the plane area occupied by the support system is reduced, and the construction progress is accelerated. The construction difficulty is reduced, and the construction influence surface is smaller.
Drawings
FIG. 1 is a construction plan view of the deepened four-wall support of the existing building elevator foundation of the invention;
fig. 2 is a sectional view of the construction of deepening four-wall support of the existing building elevator foundation.
Detailed Description
The invention will be further illustrated with reference to the following specific examples and the accompanying figures 1-2.
The invention discloses a construction method for deepening four-wall support of an existing building elevator foundation, which comprises the following steps of:
the method comprises the following steps: the specification models of the steel beams 40 and the steel columns 30 used by the steel structure supporting system are designed and calculated according to the bearing capacity of the foundation of the rest part after the elevator foundation is dismantled, the upper load, the local compression bearing capacity of the original wall 10 of the elevator, and the anti-cutting capacity of the original structure foundation 80 below the steel columns 30, and the plane positions and elevations of the steel beams 40 and the steel columns 30 relative to the original elevator four walls 10 comprise the installation height of the steel beams 40 and the size of the steel columns 30 from the original elevator four walls 10. The specification, model and spacing of the connecting struts 60 between the steel columns 30 are designed according to the height of the steel columns 30. The location of the stiffeners 50 and the materials used are designed. And checking the soil quality of the existing building foundation pit of the investigation report, and calculating the stability of the soil body of the existing building foundation pit according to the depth of the foundation pit and the slope setting requirement.
Step two: the theodolite, the level and the steel tape are used for positioning and paying off measurement, and ink lines are used for popping up the steel beam 40 on the four walls 10 of the original elevator to install the outer side line, the outer side line of the steel column 30 and the outer side line of the steel plate 20 under the column foot of the steel column 30.
Step three: and (3) carrying out static force cutting on the four walls 10 of the original elevator according to the elastic outer side lines, and cutting out the hole 11 for mounting the steel beam 40.
Step four: drilling holes on the original elevator four-wall 10 periphery original structure foundation 80 at the position of the column base lower steel plate 20, implanting a column base anchor bolt with bar-planting glue, mounting the column base lower steel plate 20, and enabling the thickness of the column base lower steel plate 20 to be 3 cm. A steel column 30 is fixed to the steel plate 20 under the column base. And (3) passing the steel beam 40 through the opening 11 and crossing and mounting the steel beam 40 on the tops of the steel columns 30 on two sides of the four walls 10 of the original elevator, and fixing the steel beam 40. The steel column 30 is fixed on the steel plate 20 under the column base, the plane position and the verticality of the steel column 30 are checked, after the requirements are met, the steel column 30 and the steel plate 20 under the column base are connected through a continuous fillet weld, and the height of the weld is required to meet the design requirements. And (3) mounting the steel beam 40 on the top of the steel column 30, checking the mounting position and elevation of the steel beam 40, fixing the steel beam 40 after the mounting position and elevation meet the requirements of the drawing, and welding the steel beam 40 and the steel column 30 in a welding manner, wherein the height of a welding line meets the requirements of the drawing. The upper flanges of the steel beams 40 are in close contact with the four walls 10 of the original elevator, and if construction deviation occurs, wedge-shaped steel plates with the thickness of 0.5mm-10mm are required to be tightly filled at two sides of the shear walls 10 of the original elevator, so that the uniform downloading of upper loads is ensured.
Step five: the top of the steel column 30 and the end part of the steel beam 40 are provided with stiffening ribs 50, one end of each stiffening rib 50 is connected with the web of the steel column 30, and the other adjacent end of each stiffening rib is connected with the lower flange of the steel beam 40. At the same time, the stiffening ribs 50 are also provided at the inner corners where the steel columns 30 are connected to the steel beams 40. The thickness of the stiffening rib 50 is 15mm, and the stiffening rib 50 is connected with the steel beam 40 and the steel column 30 in a welding mode. In this embodiment, the stiffening ribs 50 are also provided at the steel beams 40 in the opening 11 by calculation.
Step six: the steel columns 30, the steel beams 40, the stiffening ribs 50 and the steel plates 20 under the column feet form a group of steel structure supporting systems, and the multiple groups of steel structure supporting systems are arranged in a transverse and longitudinal mode in a crossed mode in sequence, so that a grid-shaped steel structure supporting system is formed.
Step seven: the upper ends of the outer sides of the steel columns 30 are provided with the connecting support rods 60, so that the steel columns 30 in all directions of a plurality of groups of steel structure supporting systems are welded together, and the integral reinforcing effect is achieved.
Step eight: four corners of the outer wall of the four walls 10 of the original elevator are respectively provided with a settlement observation point 70, and each side of the periphery of the existing building foundation pit where the four walls 10 of the original elevator are located is provided with a horizontal displacement and vertical displacement monitoring point 71. And recording the original data of settlement, horizontal displacement and vertical displacement. The organization related unit personnel check and accept the steel structure supporting system, can demolish, excavate the original structure basis 80 in the former elevator four walls 10 according to the drawing requirement after meeting the requirement, pop out the boundary line with the ink line earlier before including original structure basis 80 excavation, cut with the concrete cutting machine, reuse manual excavation foundation ditch earthwork 90. During excavation and before concrete poured in the foundation pit reaches the designed strength, the original elevator four walls 10 and the foundation pit peripheral original structure foundation 80 are detected according to a detection scheme, the stability of a side slope soil body is observed, then holes are punched in the original elevator four walls 10 corresponding to the original structure foundation 80, and reinforcing steel bars are implanted.
Step nine: binding reinforcing steel bars in the newly excavated foundation pit, pouring expansive concrete to form a newly poured concrete foundation 100, and allowing the steel structure support system to be removed when the strength of the concrete reaches over 100 percent.
The above-mentioned embodiments are only given for the purpose of more clearly illustrating the technical solutions of the present invention, and are not meant to be limiting, and variations of the technical solutions of the present invention by those skilled in the art based on the common general knowledge in the art are also within the scope of the present invention.
Claims (7)
1. The construction method for deepening the four-wall support of the existing building elevator foundation is characterized by comprising the following steps of:
the method comprises the following steps: designing and calculating specification models of steel beams (40) and steel columns (30) used by a steel structure supporting system and plane positions and elevations of the steel beams (40) and the steel columns (30) relative to the original elevator four walls (10) according to the bearing capacity and upper load of the foundation of the rest part after the elevator foundation is dismantled, the local compression bearing capacity of the original elevator four walls (10) wall body at the position of the opening and the anti-cutting capacity of an original structure foundation (80) under the steel columns (30); checking the soil quality of the existing building foundation pit of the investigation report, and calculating the stability of the soil body of the existing building foundation pit according to the depth of the foundation pit and the slope setting requirement;
step two: positioning and paying-off measurement is carried out by utilizing a theodolite, a leveling instrument and a steel tape, and an outer side line, an outer side line of a steel column (30) and an outer side line of a steel plate (20) under a column foot of the steel column (30) are arranged by popping out a steel beam (40) on the four walls (10) of the original elevator by using ink lines;
step three: performing static cutting on the four walls (10) of the original elevator according to the elastic outer side lines, and cutting out a hole (11) for mounting a steel beam (40);
step four: drilling holes on an original elevator four-wall (10) periphery original structure foundation (80) at the position where the lower column base steel plate (20) is installed, implanting a column base anchor bolt with a bar planting adhesive, installing the lower column base steel plate (20), and fixing a steel column (30) on the lower column base steel plate (20); enabling the steel beam (40) to penetrate through the opening (11) and cross and install the steel beam (40) on the tops of the steel columns (30) on two sides of the four walls (10) of the original elevator, and fixing the steel beam (40); the upper flange of the steel beam (40) is tightly contacted with the four walls (10) of the original elevator, if construction deviation occurs, wedge-shaped steel plates with the thickness of 0.5mm-10mm are required to be tightly packed at two sides of the shear wall of the four walls (10) of the original elevator, so that the uniform downward transmission of upper load is ensured;
step five: stiffening ribs (50) are arranged at the top of the steel column (30) and the end part of the steel beam (40), one end of each stiffening rib (50) is connected with the web of the steel column (30), and the adjacent other end of each stiffening rib is connected with the lower flange of the steel beam (40); meanwhile, stiffening ribs (50) are also arranged at the inner corners of the connection between the steel column (30) and the steel beam (40);
step six: the steel columns (30), the steel beams (40), the stiffening ribs (50) and the steel plates (20) under the column feet form a group of steel structure supporting systems, and the multiple groups of steel structure supporting systems are sequentially arranged in a transverse and longitudinal mode in a crossed mode, so that a grid-shaped steel structure supporting system is formed;
step seven: connecting support rods (60) are arranged at the upper ends of the outer sides of the steel columns (30), so that the steel columns (30) in all directions of a plurality of groups of steel structure supporting systems are welded together to play a role in integral reinforcement;
step eight: four corners of the outer wall of the four walls (10) of the original elevator are respectively provided with a settlement observation point (70), and each side of the periphery of the existing building foundation pit where the four walls (10) of the original elevator are located is provided with a horizontal displacement and vertical displacement monitoring point (71); recording original data of settlement, horizontal displacement and vertical displacement; relevant organization personnel check and accept the steel structure supporting system, and can dismantle and excavate the original structure foundation (80) in the four walls (10) of the original elevator according to the requirements of a drawing after meeting the requirements;
step nine: binding reinforcing steel bars in the newly excavated foundation pit, pouring expansive concrete to form a newly poured concrete foundation (100), and allowing the steel structure support system to be removed when the strength of the concrete reaches over 100 percent.
2. The construction method of deepening four-wall support of the existing building elevator foundation according to claim 1, characterized in that: in the first step, the plane positions and elevations of the steel beams (40) and the steel columns (30) relative to the four walls (10) of the original elevator comprise: the mounting height of the steel beam (40) and the distance between the steel column (30) and the original elevator four walls (10) are set; designing the specification, model and spacing of the connecting support rods (60) among the steel columns (30) according to the height of the steel columns (30); the location of the stiffeners (50) and the materials used are designed.
3. The construction method of deepening four-wall support of the existing building elevator foundation according to claim 1, characterized in that: the thickness of the steel plate (20) under the column base is not less than 2 cm.
4. The construction method of deepening four-wall support of the existing building elevator foundation according to claim 1, characterized in that: in the fourth step, fixing the steel column (30) on the lower column base steel plate (20), checking the plane position and the verticality of the steel column (30), and connecting the steel column (30) and the lower column base steel plate (20) by adopting a continuous fillet weld after meeting the requirements, wherein the height of the weld meets the design requirements; the steel beam (40) is installed on the top of the steel column (30), the installation position and elevation of the steel beam (40) are checked, the steel beam (40) is fixed after the installation position and elevation meet the requirements of the drawing, the steel beam (40) is connected with the steel column (30) in a welding mode, and the height of a welding line meets the requirements of the drawing.
5. The construction method of deepening four-wall support of the existing building elevator foundation according to claim 1, characterized in that: the thickness of the stiffening rib (50) is not less than 10mm, and the stiffening rib (50) is connected with the steel beam (40) and the steel column (30) in a welding mode.
6. The construction method of deepening four-wall support of the existing building elevator foundation according to claim 1, characterized in that: in the eighth step, before the original structure foundation (80) is excavated, an ink line is used for popping up an outer side line, a concrete cutting machine is used for cutting, and then the foundation pit earthwork (90) is excavated manually; during excavation and before concrete poured in a foundation pit reaches design strength, detecting the original elevator four walls (10) and the foundation pit peripheral original structure foundation (80) according to a detection scheme, observing the stability of a side slope soil body, then punching holes in the original elevator four walls (10) corresponding to the original structure foundation (80), and implanting reinforcing steel bars.
7. The construction method of deepening four-wall support of the existing building elevator foundation according to claim 1, characterized in that: and stiffening ribs (50) are also arranged at the steel beams (40) in the holes (11).
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| CN115613851A (en) * | 2022-12-01 | 2023-01-17 | 北京市第三建筑工程有限公司 | Construction method for newly adding existing steel beam wrapped by steel column with inclined outer frame |
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| CN115613851A (en) * | 2022-12-01 | 2023-01-17 | 北京市第三建筑工程有限公司 | Construction method for newly adding existing steel beam wrapped by steel column with inclined outer frame |
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