CN116084567B - Prestress box plate assembly type steel structure building and prestress tensioning technology thereof - Google Patents
Prestress box plate assembly type steel structure building and prestress tensioning technology thereof Download PDFInfo
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- CN116084567B CN116084567B CN202310185956.2A CN202310185956A CN116084567B CN 116084567 B CN116084567 B CN 116084567B CN 202310185956 A CN202310185956 A CN 202310185956A CN 116084567 B CN116084567 B CN 116084567B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 264
- 239000010959 steel Substances 0.000 title claims abstract description 264
- 238000005516 engineering process Methods 0.000 title abstract description 3
- 241000274582 Pycnanthus angolensis Species 0.000 claims abstract description 23
- 239000011087 paperboard Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims description 20
- 238000004873 anchoring Methods 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 12
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 13
- 239000010410 layer Substances 0.000 description 118
- 238000010276 construction Methods 0.000 description 12
- 239000003351 stiffener Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 5
- 238000009435 building construction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/342—Structures covering a large free area, whether open-sided or not, e.g. hangars, halls
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
Abstract
The invention relates to a prestress box plate assembly type steel structure building and a prestress tensioning technology thereof. Wherein prestressing force boxboard assembled steel structure building includes: the steel structure box plate module unit is formed by enclosing wall boards and stiffening floor boards, and the inner sides of the wall boards and the bottom surfaces of the stiffening floor boards are welded with main stiffening ribs and auxiliary stiffening ribs; the multidirectional prestress constraint component comprises transverse prestress steel strands, longitudinal prestress steel strands and vertical prestress steel strands, wherein the transverse prestress steel strands and the longitudinal prestress steel strands are respectively arranged on main stiffening ribs on the bottom surface of a stiffening floor slab along the transverse direction and the longitudinal direction, the vertical prestress steel strands are vertically arranged at main stiffening ribs on the inner side of a surrounding wall plate along the vertical direction, and steel structure box plate module units with preset layers are arranged from a bottom layer to a top layer in a full length mode, and the adjacent preset layers are not arranged. The invention applies three-way prestress to the box plate assembly type steel structure building, can strengthen the integral rigidity of the structure, effectively reduces the lateral displacement of the box plate type building and the vertical displacement of the floor slab, and improves the elastic limit bearing capacity of the structure.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a box plate assembled steel structure building, and specifically relates to a prestress box plate assembled steel structure building and a prestress tensioning process thereof.
Background
Along with the rapid development of building construction, the prefabricated house has been developed on a great scale according to the standardization of the design, the informatization of the management and the production efficiency, and the prefabricated house is different from the original on-site building construction, can reduce a great amount of cast-in-situ operations, can well protect the environment and save energy, and further has high competitive advantages in cost and performance price ratio of the building; in many building materials, the steel structure is suitable for modular construction in the assembled house due to the good mechanical properties such as tensile strength, bending resistance, torsion resistance and the like.
The box plate assembled steel structure building is a novel building system, has the characteristics of light dead weight, good earthquake resistance, large span, high space utilization rate, recyclable materials and the like, and is an assembled building capable of realizing industrial manufacture and assembly installation. The rigidity of the box plate assembled steel structure building is very high, buckling does not generally occur under the action of smaller load, but under the action of particularly high load (particularly high earthquake or even rare earthquake), buckling instability is easy to occur to the large-span multi-layer box plate type steel structure, the rigidity of the box plate assembled steel structure building is high, the buckling and interlayer lateral movement problems firstly occur along with the continuous increase of the load, and the higher the floor is, the larger the span is, and the more obvious the problem is.
It is therefore desirable to provide a box board assembled steel structure building based on the prestressing method.
Disclosure of Invention
In view of the defects of the prior art, the main purpose of the invention is to provide a prestress box plate assembly type steel structure building and a prestress tensioning process thereof, so as to solve the problems that the box plate assembly type steel structure building in the prior art is insufficient in bearing capacity and easy to generate building buckling and interlayer lateral movement.
The technical scheme of the invention is as follows:
the invention provides a prestress box plate assembly type steel structure building, which comprises the following components:
the steel structure box board module unit is a multi-layer box board assembled steel structure building which is assembled by surrounding wall boards and stiffening floors along the vertical direction, main stiffening ribs and auxiliary stiffening ribs are vertically distributed on the inner sides of the surrounding wall boards, and main stiffening ribs and auxiliary stiffening ribs are transversely and longitudinally distributed on the bottom surfaces of the stiffening floors;
the multidirectional prestress constraint component comprises transverse prestress steel strands, longitudinal prestress steel strands and vertical prestress steel strands, wherein the transverse prestress steel strands and the longitudinal prestress steel strands are respectively arranged on main stiffening ribs on the bottom surface of the stiffening floor slab along the transverse direction and the longitudinal direction, and the vertical prestress steel strands are vertically arranged at the main stiffening ribs on the inner side of the surrounding wall plate; and is also provided with
The multi-layer box board assembled steel structure building is divided into a bottom tensioning layer and a standard tensioning layer by steel structure box board module units with preset layers, and the vertical prestress steel strands are arranged in the steel structure box board module units with preset layers in a through length mode, and one layer of adjacent preset layers is not arranged at intervals.
In some embodiments, the main stiffening rib is a T-shaped rib, the web of the T-shaped rib is perpendicular to the surrounding wall plate and is welded and connected, the auxiliary stiffening rib is an L-shaped rib, and the main stiffening rib on the inner side of the surrounding wall plate is arranged corresponding to the main stiffening rib on the bottom surface of the stiffening floor plate and is welded and connected at the intersection.
In some embodiments, the vertical prestressed steel strands are arranged at corners where two sides of the T-shaped rib web on the inner side of the surrounding wall plate are connected with the surrounding wall plate.
In some embodiments, in the steel structure box plate module unit of the bottom tensioning layer, a horizontal stiffening plate is welded at the bottom of the bottom tensioning layer, the horizontal stiffening plate is welded between two sides of a T-shaped rib web plate on the inner side of the surrounding wall plate and the surrounding wall plate, the lower end of the vertical prestress steel strand is anchored to the horizontal stiffening plate, and the upper end is anchored to a stiffening floor at the top of the bottom tensioning layer.
In some embodiments, in the steel structure box plate module unit of the standard layer stretching layer, a horizontal stiffening plate is welded on the lower flange of the T-shaped rib on the bottom surface of the stiffening floor at the bottom of the standard layer stretching layer in the same level, the horizontal stiffening plate is welded between two sides of the T-shaped rib web on the inner side of the surrounding wall plate and the surrounding wall plate, the lower end of the vertical prestress steel strand is anchored on the horizontal stiffening plate, and the upper end is anchored on the stiffening floor at the top of the standard layer stretching layer.
In some embodiments, a steel sleeve is arranged on the periphery of the vertical prestress steel strand, the steel sleeve is arranged in a segmented mode in a steel structure box plate module unit with a preset layer number, and two ends of each segment of steel sleeve are welded and fixed with a stiffening floor.
In some embodiments, a plurality of outer edge plates are welded on the lower flange of the T-shaped rib on the bottom surface of the stiffening floor at a certain distance, the transverse prestress steel strand and the longitudinal prestress steel strand are arranged on the lower flange of the T-shaped rib which is arranged along the transverse direction and the longitudinal direction, and two ends of the steel strand are anchored on the outer edge plates.
In some embodiments, the peripheries of the transverse prestress steel strand and the longitudinal prestress steel strand are respectively provided with a steel sleeve, the steel sleeves are arranged in a segmented mode, and two ends of each steel sleeve are welded on corresponding outer edge plates.
In some embodiments, the predetermined number of layers is 2-4 layers.
The invention also provides a prestress tensioning process of the prestress box plate assembly type steel structure building, which comprises the following steps of:
s1: tensioning the vertical prestress steel strand, including:
s101: firstly, steel sleeves which are arranged in sections and correspond to preset layers of steel structure box board module units are welded in holes at the end parts of stiffening floors in the vertical direction;
s102: welding a vertical stiffening plate between a stiffening floor and a horizontal stiffening plate along the end part of a steel sleeve, firstly anchoring the lower end of a vertical prestress steel strand to the horizontal stiffening plate on the bottom surface of a preset layer, then upwards penetrating through a steel structure box plate module unit on the preset layer and stretching the upper end, and anchoring the upper end of the vertical prestress steel strand to the stiffening floor on the top surface of the preset layer after stretching;
s103: setting backing plates along two ends of the stretched vertical prestress steel strand;
s2: stretching the longitudinal prestressed steel strand and the transverse prestressed steel strand, wherein the stretching comprises the following steps:
s201: firstly, welding an outer edge plate on the outer edge of a main stiffening rib flange on the bottom surface of a stiffening floor slab along a certain distance, and then welding second vertical stiffening plates along two sides of the outer edge plate;
s202: then welding the steel sleeve between two adjacent outer edge plates;
s203: stretching the longitudinal prestress steel strand and the transverse prestress steel strand to pass through a steel sleeve;
s204: finally, respectively anchoring the two ends of the longitudinal prestress steel strand and the transverse prestress steel strand on the corresponding outer edge plates through backing plates;
s205: and after one layer is completed, laying the prestressed steel strands layer by layer upwards until the prestress application of each preset layer of stiffening floor slab is completed.
Compared with the prior art, the invention has the beneficial effects that: the invention applies three-way prestress to the prestress box plate assembly type steel structure building, can effectively reduce the lateral displacement of the box plate assembly type steel structure building and the vertical displacement of the floor slab, increases the structural ductility, improves the integral rigidity of the structure, improves the crossing capacity, improves the ultimate bearing capacity of the structure and delays the occurrence time of buckling. Specifically, it has at least the following practical effects:
the invention arranges the prestress steel strand along the transverse direction, the longitudinal direction and the vertical direction of the box plate assembled steel structure building and stretches the prestress steel strand, the application of the three-dimensional prestress can improve the bearing capacity of the structure, the integral stability of the structure, and the earthquake resistance of the multi-storey large-span box plate assembled steel structure building.
The prestress constraint components are arranged close to the main stiffening ribs of the wall plates and the stiffening rib floor slabs, so that the wall plates and the stiffening rib floor slabs are effectively tied, and the arrangement positions of the prestress constraint components do not affect the space utilization area.
According to the invention, the steel sleeve is arranged on the periphery of the prestress steel strand, so that the steel strand can be protected from corrosion damage, the prestress loss is reduced, and the prestress steel strand can be used as the rigidity of a supporting and lifting structure.
The prestress tensioning process provides a thought for the three-dimensional prestress steel rope tensioning construction sequence of the multi-layer box plate assembly type steel structure building.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, but rather by the claims.
FIG. 1 is a schematic illustration of a seven-layer prestress box plate assembly type steel structure construction according to an embodiment of the invention;
FIG. 2 is a schematic diagram of the arrangement of vertical prestressed steel strands of a seven-layer prestressed box-plate fabricated steel structure building;
FIG. 3 is a schematic diagram of a transverse and longitudinal pre-stressed steel strand arrangement according to one embodiment of the invention;
FIG. 4 is a detailed view of a longitudinal prestressed steel strand according to one embodiment of the present invention;
FIG. 5 is a schematic view of an arrangement of (upper three layers of) vertical prestressed steel strands according to one embodiment of the present invention;
FIG. 6 is a schematic view in section A-A of FIG. 5;
fig. 7 is a schematic diagram of an arrangement of (lower three layers of) bottom layer vertical prestressed steel strands according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the embodiments and the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It should be understood that the terms "comprises/comprising," "consists of … …," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method as desired. Without further limitation, an element defined by the phrases "comprising/including … …," "consisting of … …," and the like, does not exclude the presence of other like elements in a product, apparatus, process, or method that includes the element.
It is further understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship based on that shown in the drawings, merely to facilitate describing the present invention and to simplify the description, and do not indicate or imply that the devices, components, or structures referred to must have a particular orientation, be configured or operated in a particular orientation, and are not to be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The technical standard of the box plate steel structure assembly type building prescribes that: the height of the box plate assembled steel structure building structure is not more than 50 meters, and the structural space span without columns and walls is not more than 12 meters. In the existing building, the box plate assembled steel structure building with only one layer of height is stable in general stress, because only one layer is arranged, the floor of the building is difficult to vertically displace at the same time when the interlayer displacement does not occur, the rigidity of the multi-layer box plate assembled steel structure building is large, the problems of buckling and interlayer lateral displacement occur at first along with the continuous increase of load, and the higher the floor is, the larger the span is, and the more obvious the problem is.
Therefore, in order to reduce the interlayer displacement and the vertical displacement of the floor slab of the multi-layer box plate assembled steel structure building and improve the ductility of the structure, the invention mainly aims at researching the multi-layer box plate assembled steel structure building and provides the pre-stress box plate assembled steel structure building which utilizes pre-stress steel strands to apply three-dimensional pre-stress.
The implementation of the present invention will be described in detail with reference to the preferred embodiments.
The embodiment shown in fig. 1 and 2 discloses a seven-layer prestress box plate assembly type steel structure building, which consists of a steel structure box plate module unit 100 and a multidirectional prestress constraint member.
In this embodiment, the steel structure box board module units 100 are assembled into a seven-layer box board assembled steel structure building along the vertical direction, each layer of steel structure box board module unit 100 is formed by enclosing the surrounding wall boards 1 and the stiffening floor boards 2, and the inner sides of the surrounding wall boards 1 and the bottom surfaces of the stiffening floor boards 2 are welded with the main stiffening ribs 3 and the auxiliary stiffening ribs 4.
Referring to fig. 1 and 2, main stiffening ribs 3 are welded in the middle of the inner side of the enclosure wall board 1 along the vertical direction, auxiliary stiffening ribs 4 are uniformly arranged on two sides of the main stiffening ribs 3, main stiffening ribs 3 are welded in the middle of the bottom surface of the stiffening floor board 2 along the transverse direction and the longitudinal direction in a crossing manner, and auxiliary stiffening ribs 4 are uniformly arranged on two sides of the main stiffening ribs 3 along the transverse direction and the unidirectional direction.
Referring to fig. 2, the multidirectional prestress restraining member includes a transverse prestress wire 5, a longitudinal prestress wire 6 and a vertical prestress wire 7, the transverse prestress wire 5 is disposed on a main stiffener 3 of a bottom surface of the stiffening floor 2 along a transverse direction of the stiffening floor 2, the longitudinal prestress wire 6 is disposed on the main stiffener 3 of the bottom surface of the stiffening floor 2 along a longitudinal direction of the stiffening floor, the vertical prestress wire 7 is disposed at the main stiffener 3 of an inner side of the enclosure wall plate 1 along a vertical direction, and the steel structure box plate module units 100 with preset layers are all-length disposed from a bottom layer to a top layer, and no adjacent preset layers are disposed.
The bearing capacity of the structure can be improved through the application of three-dimensional prestress, the overall stability of the structure is improved, and the earthquake resistance of the multi-floor large-span box plate assembly type steel structure building is enhanced.
In the invention, seven layers are taken as an example, a multi-layer box board assembled steel structure building is divided into a bottom tensioning layer and a standard tensioning layer by steel structure box board module units with preset layers, vertical prestress steel strands are arranged in the steel structure box board module units with preset layers in a through length mode, and one layer is not arranged between every two adjacent preset layers.
It is easy to understand that the fact that no layer is arranged between the adjacent preset layers refers to the fact that a layer is arranged between the adjacent preset layers, so that the problem that the vertical prestress steel strand 7 is difficult to stretch for a long time is avoided, and prestress loss is reduced.
It will be readily understood that the transverse direction in the present invention is the short side direction of the stiffening floor 2 arranged in the horizontal direction, and the longitudinal direction is the long side direction thereof.
The preset layer number can be every two layers, or can be every three layers, four layers or other layer numbers, and the specific preset layer number is comprehensively determined by the total layer number, stress analysis and the like of the specifically constructed prestress box plate assembly type steel structure building.
In the embodiment, according to the actual height of the box plate assembled multi-high-rise steel structure building, the preset layer number is ideal to stretch by three layers, the diameter of the steel stranded wire is proper, the stretching requirement can be met, and the method is more economical. In the vertical direction, every three layers of the building bottom layer are vertically tensioned once through the vertical prestressed steel strands 7, no vertical prestressed steel strands 7 are arranged at intervals between every two layers, the building is divided into a lower layer, a spacing layer and an upper layer from the bottom layer to the top layer through tensioning positions of the vertical prestressed steel strands 7, the lower layer is a first layer to the three layers, the spacing layer is a fourth layer, and the upper layer is a fifth layer to a seventh layer. The vertical direction sets up prestressing force steel strand wires can effectively increase structure lateral rigidity, reduces the lateral displacement of enclosure wall panel 1, and the interval one deck can make prestressing force steel strand wires shorten to reduce prestressing force loss.
Referring to fig. 3 and 4, the transverse prestressed steel strands 5 and the longitudinal prestressed steel strands 6 are respectively and correspondingly arranged at the outer edges of the flanges of the main stiffening rib 3 welded transversely and longitudinally along the bottom surface of the stiffening floor slab 2. Because the box plate assembly type steel structure floor slab is bent downwards in most cases, the flanges of the main stiffening ribs 3 are mostly tension areas, and the steel stranded wires can play a more effective role in tie the stiffening floor slab 2.
The main stiffening rib 3 on the bottom surface of the stiffening floor slab 2 is welded with an outer edge plate 9, and the ends of the transverse prestress steel strand 5 and the longitudinal prestress steel strand 6 are anchored on the outer edge plate 9. Preferably, the ends of the transverse prestress steel strand 5 and the longitudinal prestress steel strand 6 are provided with backing plates 10 corresponding to the outer edge plates 9 for reinforcing the rigidity of the anchoring ends.
With continued reference to fig. 3 and 4, steel bushings 8 are provided around the outer peripheries of the transverse and longitudinal prestressed steel strands 5, 6 to protect the steel strands. The steel sleeve 8 is generally arranged in a segmented mode, the segmented length is determined according to the space span of a concrete construction building, the steel sleeve 8 is connected with the main stiffening rib 3 on the bottom surface of the stiffening floor slab 2, the connection is more compact, the prestress is more easily applied to the main stiffening rib 3, the vertical displacement is reduced, the segmented arrangement is convenient to transport, and the problem that the installation and the construction are difficult due to the fact that the sleeve is overlong is avoided.
Both ends of each section of steel sleeve 8 arranged on the bottom surface of the stiffening floor slab 2 in a segmented way are welded on the outer edge plate 9. Preferably, the outer edge plate 9 is a square steel plate with certain strength.
Preferably, the outer edge plate 9 is symmetrically welded with second vertical stiffening plates 13 corresponding to the two sides of the steel sleeve 8.
In the embodiment shown in fig. 3 and fig. 4, the overhanging structures formed by the outer edge plate 9 and the second vertical stiffening plate 13 are evenly distributed at 4 positions of the outer edge of the flange of the main stiffening rib 3, the bottom surface of the stiffening floor slab 2 is evenly divided into 3 sections along the steel sleeve 8 which is transversely and longitudinally arranged, and each section is correspondingly welded on the outer edge plate 9. Two second vertical stiffening plates 13 are correspondingly welded on two sides of the outer edge plate 9 respectively, and the steel sleeve 8 is arranged between the two adjacent second vertical stiffening plates 13.
The transverse prestress steel strands 5 and the longitudinal prestress steel strands 6 are arranged in the horizontal direction and stretch the stiffening floor slab 2 of each layer of the steel structure box plate module unit 100, and the transverse prestress steel strands 5 and the longitudinal prestress steel strands 6 are distributed in a cross shape in a crossed mode, and the transverse prestress steel strands 5 and the longitudinal prestress steel strands 6 are staggered. The horizontal direction sets up prestressing force steel strand wires along horizontal and vertical can effectively reduce the vertical displacement of stiffening floor 2, increases the structure ductility, bears the large-span of structure, is applied to the boxboard steel structure of bigger span.
On the horizontal direction, when great load produces shearing and bending action to stiffening floor 2, stiffening floor 2 gets into elastoplasticity, and stiffening floor 2 and main stiffening rib 3 buckling downwards, and the tension district of stiffening floor 2 and main stiffening rib 3 can deformation extension, and the prestressing force of horizontal prestressing force steel strand wires 5 and vertical prestressing force steel strand wires 6 under the main stiffening rib 3 edge of a wing can be regarded as restoring force to reduce the deformation displacement in tension district this moment to reduce the vertical displacement and the floor buckling of stiffening floor 2, improved the ultimate elastic limit bearing capacity of structure and postponed buckling time.
Referring to fig. 2 and 6, vertical prestressed steel strands 7 are disposed at corners where two sides of the web of the main stiffener 3 inside the wall panel 1 are connected to the wall panel 1. Preferably, the vertical prestress steel strand 7 is symmetrically arranged along two sides of the web plate of the main stiffening rib 3, and the vertical prestress steel strand 7 is arranged at the position, so that the vertical prestress steel strand is positioned at the centroid position of vertical force transmission, can play a more effective drawknot role on the surrounding wall board 1, does not occupy the use space of a building, and improves the use ratio.
Fig. 5 is a layout diagram of an upper three-layer vertical prestressed steel strand 7 in this embodiment, the upper ends of the vertical prestressed steel strands 7 are anchored on a stiffening floor slab 2 on the top surface of the upper three-layer through a backing plate 10, and the lower ends of the vertical prestressed steel strands are anchored on a horizontal stiffening plate 11 welded in the same level along the lower flange of a main stiffening rib 3 on the bottom surface of the stiffening floor slab 2 through the backing plate 10. Further, the upper and lower anchoring ends of the vertical prestress steel strand 7 are respectively provided with a vertical stiffening plate 12, and the vertical stiffening plates 12 are arranged between the stiffening floor slab 2 and the horizontal stiffening plates 11 for increasing the rigidity of the anchoring ends.
Referring to fig. 6, the length of the horizontal stiffener 11 is identical to the length of the vertically disposed main stiffener 3, and the vertical stiffener 12 is welded vertically in the middle of the horizontal stiffener 11.
Fig. 7 is a layout diagram of a bottom layer vertical prestressed steel strand 7 of the lower three layers of the present embodiment, the upper end anchoring manner of the vertical prestressed steel strand 7 is the same as that of the upper three layers, and since the bottom layer of the lower three layers has no floor, the lower end of the lower three layers of the vertical prestressed steel strand 7 is provided with two horizontal stiffening plates 11 and one vertical stiffening plate 12, the vertical stiffening plate 12 is arranged between the two horizontal stiffening plates 11 for enhancing the rigidity of the lower anchoring end, and the lower anchoring end is arranged at a position above the ground for installation and construction.
The horizontal stiffening plate 11, the second vertical stiffening plate 13 and the vertical stiffening plate 12 are all steel plates.
In the vertical direction, under great external load effect, when the structure is in elastoplastic stage, the wall panel 1 of enclosing wall and main stiffening rib 3 can take place to incline, buckling, and the interlaminar side can increase, and wall panel 1 of drawing side and main stiffening rib 3 can become longer, and the prestressing force in the vertical prestressing force steel strand wires 7 can make the deformation that draws side reduce partly to reduce interlaminar side and wall panel 1 buckling degree, improved the ultimate bearing capacity of structure and postpone buckling time.
Referring to fig. 5 to 7, a steel sleeve 8 is disposed around the vertical prestressed steel strand 7 to protect the vertical prestressed steel strand 7 from corrosion damage, and the steel sleeve 8 is disposed in segments corresponding to the preset number of layers of steel structure box plate module units 100. In the embodiment shown in fig. 2, the steel sleeve 8 vertically arranged is divided into 3 sections, two ends of each section of steel sleeve 8 are welded on the corresponding stiffening floor slab 2, and the steel sleeve 8 is segmented to facilitate installation construction, and can support the stiffening floor slab 2 and strengthen the lateral rigidity of floors.
In some implementations, the primary stiffener 3 is a T-shaped rib and the secondary stiffener 4 is an L-shaped rib.
The whole structure of the seven-layer prestress box plate assembly type steel structure building is slender, so that vertical stretching is important, each three layers of steel structure box plate module units 100 are stretched once, the stretching length is long, the vertical prestress steel strands 7 are stretched first to reduce prestress loss, the vertical stretching is stretched from bottom to top, the symmetrical stretching is followed, the vertical stretching is continued at intervals from one layer to complete stretching of the whole floor; and then, carrying out longitudinal stretching and transverse stretching, and also carrying out longitudinal stretching and transverse stretching of the upper layer after finishing one layer according to the principle of symmetrical stretching from inside to outside, and carrying out prestress steel strand stretching on each layer of steel structure box plate module units 100 from bottom to top.
The principle of longitudinal stretching and transverse stretching is that the longitudinal prestress steel strand 6 is longer than the transverse prestress steel strand 5, and if the opposite is the case, the short-bundle prestress steel strand is stretched first and then the Zhang Lachang-bundle prestress steel strand is stretched, so that after the stretching is finished, the short-bundle prestress loss is too large and the efficiency is too low.
The invention further comprises a prestress tensioning process based on the prestress box plate assembly type steel structure building.
Taking seven-layer prestress box plate assembly type steel structure building as an example, the specific prestress tensioning process is as follows:
after the seven-layer steel structure box plate module unit 100 is assembled, firstly tensioning the vertical prestress steel strands 7, firstly welding two horizontal stiffening plates 11 along the bottom layer of the lower three layers, welding the upper ends of 3 sections of vertical steel sleeves 8 on the perforated stiffening floor slab 2, welding the lower ends on the horizontal stiffening plates 11, respectively welding the vertical stiffening plates 12 between the stiffening floor slab 2, the horizontal stiffening plates 11 and the two horizontal stiffening plates 11 along the upper and lower ends of each section of steel sleeve 8, then tensioning the lower three layers, firstly anchoring the bottom ends of the vertical prestress steel strands 7 below the horizontal stiffening plates 11, upwards penetrating the vertical prestress steel strands 7 for 3 layers and tensioning the upper ends, and anchoring the upper ends of the vertical prestress steel strands 7 on the top surface of the stiffening floor slab 2 after tensioning in place; and backing plates 10 are arranged at the two tensioned ends of the three-layer vertical prestress steel strand 7 and used for reinforcing the rigidity of an anchoring end and reducing the local deformation of the structure under prestress.
And after the lower three-layer prestress tensioning is finished, spacing one layer, and continuously finishing the upper three-layer prestress tensioning. The prestress steel strand is arranged at intervals instead of being stretched vertically integrally, because the prestress steel strand is changed into two sections, the length is shorter, the prestress loss can be reduced, and the prestress in the steel strand can meet the requirement and cannot be too large.
The upper end of the tensioning of the upper three-layer box plate type prestressed steel strand is anchored on the top surface of the stiffening floor slab 2, the lower end of the tensioning is anchored on the horizontal stiffening plate 11, and a backing plate 10 and a vertical stiffening plate 12 are arranged at the anchoring end to increase the rigidity of the anchoring end.
After the vertical prestressed steel strand 7 is tensioned, the longitudinal and transverse prestressed steel strands in the horizontal direction are tensioned, firstly, an outer edge plate 9 and a second vertical stiffening plate 13 are welded on the outer edge of a flange of a main stiffening rib 3 on the bottom surface of a stiffening floor slab 2, then 3 sections of steel sleeves 8 are welded on the outer edge plate 9, then the longitudinal prestressed steel strand 6 and the transverse prestressed steel strand 5 are tensioned, two ends of the longitudinal prestressed steel strand are anchored on the outer edge plate 9 through the steel sleeves 8, and the outer edge plate 9 is provided with a backing plate 10 and the second vertical stiffening plate 13 to strengthen the rigidity of an anchoring end. After one layer is completed, the prestress steel strand is upwards applied layer by layer until the prestress application of each layer of stiffening floor slab 2 is completed.
The prestress tensioning process is carried out after the box plate assembly type steel structure is built. The horizontal stiffening plates of the same level as the stiffening floor are welded on the lower flange of the main stiffening rib on the bottom surface of the stiffening floor in the building construction process, and the two horizontal stiffening plates welded on the bottommost layer of the building are welded in the prestress tensioning process.
The holes of the stiffening floor slab and the main stiffening rib, through which the prestressed steel strands are stretched, are prefabricated in a factory, and the prestressed steel strands are stretched only after the steel structure box plate module units are assembled in the vertical direction in a construction site. The prestress tensioning process provides a thought for the three-dimensional prestress steel rope tensioning construction sequence of the multi-layer box plate assembly type steel structure building.
It is easy to understand by those skilled in the art that the embodiment of the invention is described by using seven-layer prestress box plate assembly type steel structure construction, but the invention can be applied to box plate assembly type steel structure construction of other multi-storeys, and only the same prestress steel strand tensioning method is needed for upward construction.
It is easy to understand by those skilled in the art that the above preferred embodiments can be freely combined and overlapped without conflict.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.
Claims (9)
1. A pre-stressed boxboard assembled steel structure building, comprising:
the steel structure box board module unit is a multi-layer box board assembled steel structure building which is assembled by surrounding wall boards and stiffening floors along the vertical direction, main stiffening ribs and auxiliary stiffening ribs are vertically distributed on the inner sides of the surrounding wall boards, and main stiffening ribs and auxiliary stiffening ribs are transversely and longitudinally distributed on the bottom surfaces of the stiffening floors; the main stiffening ribs are T-shaped ribs, and the auxiliary stiffening ribs are L-shaped ribs; the web plate of the T-shaped rib on the inner side of the wall plate is welded and connected with the wall plate perpendicular to the wall plate;
the multidirectional prestress constraint component comprises transverse prestress steel strands, longitudinal prestress steel strands and vertical prestress steel strands, wherein the transverse prestress steel strands and the longitudinal prestress steel strands are respectively arranged on main stiffening ribs on the bottom surface of the stiffening floor slab along the transverse direction and the longitudinal direction, and the vertical prestress steel strands are vertically arranged at the main stiffening ribs on the inner side of the surrounding wall plate; the vertical prestress steel strands are arranged at corners, connected with the surrounding wall plate, of two sides of the T-shaped rib web on the inner side of the surrounding wall plate; and is also provided with
The multi-layer box board assembled steel structure building is divided into a bottom tensioning layer and a standard tensioning layer by steel structure box board module units with preset layers, and the vertical prestress steel strands are arranged in the steel structure box board module units with preset layers in a through length mode, and one layer of adjacent preset layers is not arranged at intervals.
2. The pre-stressed box-panel fabricated steel structure building of claim 1, wherein the primary stiffening ribs on the inner side of the surrounding wall panels are arranged corresponding to the primary stiffening ribs on the bottom surface of the stiffening floor slab and are welded at the intersections.
3. The pre-stressed box-plate assembled steel structure building of claim 1, wherein in the steel structure box-plate module unit of the bottom tensioning layer, a horizontal stiffening plate is welded at the bottom of the bottom tensioning layer, the horizontal stiffening plate is welded between two sides of a T-shaped rib web on the inner side of the surrounding wall plate and the surrounding wall plate, the lower end of the vertical pre-stressed steel strand is anchored to the horizontal stiffening plate, and the upper end is anchored to a stiffening floor on the top of the bottom tensioning layer.
4. The prestress box plate assembly type steel structure building according to claim 1, wherein in the steel structure box plate module unit of the standard layer tensioning layer, a horizontal stiffening plate is welded on the lower flange of a T-shaped rib of the bottom surface of a stiffening floor at the bottom of the standard layer tensioning layer in the same level, the horizontal stiffening plate is welded between two sides of a T-shaped rib web on the inner side of the surrounding wall plate and the surrounding wall plate, the lower end of the vertical prestress steel strand is anchored to the horizontal stiffening plate, and the upper end is anchored to the stiffening floor at the top of the standard layer tensioning layer.
5. The prestress box plate assembly type steel structure building of claim 1, wherein steel sleeves are arranged on the periphery of the vertical prestress steel strands and are arranged in steel structure box plate module units with preset layers in a segmented mode, and two ends of each steel sleeve are welded and fixed with a stiffening floor.
6. The pre-stressed box-plate assembled steel structure building of claim 1, wherein a plurality of outer edge plates are welded on the lower flange of the T-shaped rib on the bottom surface of the stiffening floor at certain intervals, the transverse pre-stressed steel strands and the longitudinal pre-stressed steel strands are arranged on the lower flange of the T-shaped rib which is distributed along the transverse direction and the longitudinal direction, and two ends of the steel strands are anchored on the outer edge plates.
7. The pre-stressed box-plate assembled steel structure building of claim 6, wherein the peripheries of the transverse pre-stressed steel strands and the longitudinal pre-stressed steel strands are respectively provided with a steel sleeve, the steel sleeves are arranged in a segmented mode, and two ends of each steel sleeve are welded on corresponding outer edge plates.
8. The pre-stressed deck-mounted steel structure building of any one of claims 1 to 7, wherein said predetermined number of layers is 2-4.
9. A prestressed tensioning process of a prestressed boxboard assembled steel structure building according to any one of claims 1-8, characterized by the following steps:
s1: tensioning the vertical prestress steel strand, including:
s101: firstly, steel sleeves which are arranged in sections and correspond to preset layers of steel structure box board module units are welded in holes at the end parts of stiffening floors in the vertical direction;
s102: welding a vertical stiffening plate between a stiffening floor and a horizontal stiffening plate along the end part of a steel sleeve, firstly anchoring the lower end of a vertical prestress steel strand to the horizontal stiffening plate on the bottom surface of a preset layer, then upwards penetrating through a steel structure box plate module unit on the preset layer and stretching the upper end, and anchoring the upper end of the vertical prestress steel strand to the stiffening floor on the top surface of the preset layer after stretching;
s103: setting backing plates along two ends of the stretched vertical prestress steel strand;
s2: stretching the longitudinal prestressed steel strand and the transverse prestressed steel strand, wherein the stretching comprises the following steps:
s201: firstly, welding an outer edge plate on the outer edge of a main stiffening rib flange on the bottom surface of a stiffening floor slab along a certain distance, and then welding second vertical stiffening plates along two sides of the outer edge plate;
s202: then welding the steel sleeve between two adjacent outer edge plates;
s203: stretching the longitudinal prestress steel strand and the transverse prestress steel strand to pass through a steel sleeve;
s204: finally, respectively anchoring the two ends of the longitudinal prestress steel strand and the transverse prestress steel strand on the corresponding outer edge plates through backing plates;
s205: and after one layer is completed, laying the prestressed steel strands layer by layer upwards until the prestress application of each preset layer of stiffening floor slab is completed.
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