CN107227682B - PBL stiffening type flat steel box concrete slab arch and construction method thereof - Google Patents
PBL stiffening type flat steel box concrete slab arch and construction method thereof Download PDFInfo
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- CN107227682B CN107227682B CN201710596861.4A CN201710596861A CN107227682B CN 107227682 B CN107227682 B CN 107227682B CN 201710596861 A CN201710596861 A CN 201710596861A CN 107227682 B CN107227682 B CN 107227682B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 114
- 239000010959 steel Substances 0.000 title claims abstract description 114
- 239000004567 concrete Substances 0.000 title claims abstract description 86
- 238000010276 construction Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 238000005056 compaction Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 239000003351 stiffener Substances 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000011150 reinforced concrete Substances 0.000 abstract description 9
- 239000004575 stone Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000002301 combined effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 239000011800 void material Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D4/00—Arch-type bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/268—Composite concrete-metal
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a PBL stiffening flat steel box concrete slab arch and a construction method thereof. Solves the problems of complicated construction procedures of masonry and reinforced concrete slab arches and large shrinkage stress in the arches in the prior art. The invention has the advantages of simple structure, reasonable design, convenient construction, excellent mechanical property and easy control of construction quality.
Description
Technical Field
The invention relates to the technical field of main arch structures of steel box concrete arch bridges, in particular to a PBL stiffening type flat steel box concrete slab arch and a construction method thereof.
Background
The arch bridge can be divided into slab arch, rib arch, double curved arch and box arch according to the arch ring cross section form. Slab arches are largely classified into stone slab arches, concrete slab arches and reinforced concrete slab arches.
The stone slab arch fully utilizes the characteristic of high compressive strength of stone, has higher bearing capacity and is often used as a small and medium span arch bridge in areas where stone is contained. The stone slab arch bridge has higher requirements on the quality of stones, such as integrity, homogeneity, compressive bending strength and the like, as well as the processing and manufacturing of arch stones, masonry technology and the like, and the stone needs to be provided with staggered joints, pentagonal stones and other structures in the masonry process so as to meet the construction and stress requirements. Meanwhile, in order to facilitate the processing of the arch stones and ensure that the masonry meets the structural requirements, the arch stones need to be numbered. For the arc arches with equal cross sections, the arches are circular arcs, so that the specifications of the arches are less, and the numbering is simple; when the variable cross section catenary arch is adopted, the curvature radius is changed along with the change of the cross section, so that the arch stones are more in types and complex in number.
The concrete slab arch can be cast in situ integrally or prefabricated. The cast-in-place concrete arch ring is widely applied due to higher integrity, but has large in-arch shrinkage stress, large material consumption of the arch centering and the template, much labor and long construction period. When a precast concrete masonry arch ring is used, the construction and construction are similar to those of a stone slab arch.
The reinforced concrete slab arch can be made into a single integral arch ring or a plurality of parallel plate (rib) arch rings according to the bridge width requirement, and has the characteristics of simple structure, neat appearance, light weight, beautiful appearance and the like, and the plate thickness is determined according to the requirement. The reinforced concrete slab arch is similar to the concrete slab arch, and has the defects of large shrinkage stress of concrete, large arch frame, template, steel bar binding, large concrete pouring engineering quantity and the like.
The slab arch bridge generally adopts a rectangular solid section, the section resistance distance is small under the condition of the same section area, and the strength of the material is not fully utilized when the bending moment acts. If the same cross-sectional resistance as other forms of cross-section is to be obtained, the cross-sectional area of the arch must be increased, which correspondingly increases the amount of material and the structural dead weight, as well as the amount of engineering of the foundation, and it is uneconomical to use this method. At the same time, the economics of such siding arches decrease as the span of the arch bridge increases.
To sum up, several problems are common in existing masonry and reinforced concrete slab arches: the first stone slab arch has certain regional limitation, has high requirements on stone quality and processing and manufacturing, and increases the dead weight of the stone slab arch sharply along with the increase of the span; secondly, the concrete slab arch has the defects of large shrinkage stress in the arch, large consumption of arch centering and template materials, much labor and time consumption, long construction period and the like; thirdly, the reinforced concrete slab arch has the defects of large shrinkage stress of concrete, large arch frame, template, steel bar binding, large concrete pouring engineering quantity and the like.
In recent years, concrete filled steel tube structures are used in the construction of arch bridges in large quantities with their excellent properties. The interaction of the steel pipe and the concrete in the stress process, namely the restraint effect of the steel pipe on the core concrete, is utilized, so that the compressive strength of the concrete is improved, and the plasticity and toughness performance are improved. Meanwhile, the core concrete has a good supporting effect on the steel pipe, the capability of the steel pipe for resisting local instability can be improved, and the local buckling of the steel wall plate is avoided or delayed, so that the full play of the material performance of the steel pipe is ensured. In addition, in the construction process of the steel pipe concrete arch ring, the steel pipe can also be used as a template for pouring core concrete, so that the template cost is saved, and the construction progress can be accelerated. However, the concrete filled steel tube structure is rarely applied to the construction of the slab arch bridge.
Therefore, how to apply the steel tube concrete structure to the construction of the slab arch bridge is a technical problem which needs to be solved.
Disclosure of Invention
The invention aims to provide a PBL (Perfobond Leiste, chinese interpretation: orifice plate) stiffening type flat steel box concrete slab arch and a construction method thereof, which solve the problems of complicated construction procedures of masonry and reinforced concrete slab arches and large arch shrinkage stress in the prior art. The invention has the advantages of simple structure, reasonable design, convenient construction, excellent mechanical property and easy control of construction quality.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a PBL stiffening flat steel box concrete slab arch, which comprises a main arch formed by assembling at least one arch segment, wherein the arch segment comprises a rectangular steel box, a plurality of PBL stiffening ribs are arranged on the top plate, the bottom plate and the inner wall of a side web plate of the steel box along the direction of an arch axis, and the steel box is filled with concrete.
Still further, the invention is characterized in that:
the steel box is internally provided with a plurality of middle webs, the middle webs are provided with a plurality of first through holes, the upper end face and the lower end face of the middle webs are respectively connected with a top plate and a bottom plate of the steel box, the inside of the steel box is divided into a plurality of chambers through the middle webs, and the chambers are filled with concrete.
The first through holes are positioned on the central axis of the middle web plate, and the shapes and the sizes of the first through holes are the same; the larger the force borne by the middle web, the smaller the distance between two adjacent first through holes.
Or, a plurality of middle webs are arranged in the steel box, the middle webs are solid plates, a plurality of PBL stiffening ribs are arranged on the middle webs along the arch axis direction, the upper end face and the lower end face of the middle webs are respectively connected with the top plate and the bottom plate of the steel box, the interior of the steel box is divided into a plurality of chambers through the middle webs, concrete is filled in one chamber of two adjacent chambers, and the other chamber is a cavity.
And each cavity of the arch segment at the arch crown of the main arch is internally provided with a first diaphragm which is a solid plate and is respectively connected with the top plate, the bottom plate and the adjacent two middle webs of the steel box, or the first diaphragm is respectively connected with the top plate, the bottom plate, the side webs and the middle webs of the steel box.
And a plurality of second diaphragm plates are arranged in each cavity of the arch section at the rest position of the main arch, round corner quadrilateral holes are formed in the middle parts of the second diaphragm plates, and the second diaphragm plates are respectively connected with the top plate, the bottom plate and the adjacent two middle webs of the steel box, or are respectively connected with the top plate, the bottom plate, the side webs and the middle webs of the steel box.
And the four corners of the first diaphragm plate and the second diaphragm plate are respectively provided with 1/4 arc-shaped overselding arc holes.
The PBL stiffeners are perpendicular to the top plate, bottom plate, or edge webs to which they are attached.
And a plurality of second through holes are formed in the central axis of the PBL stiffening rib, and the shapes and the sizes of the second through holes are the same.
The steel box is flat, and the length of steel box is greater than the height.
The middle web plate, the first diaphragm plate, the second diaphragm plate and the PBL stiffening ribs are all steel plates.
The concrete is self-compacting micro-expansion shrinkage compensation concrete.
The shape of the main arch is parabolic or catenary, and the main arch is connected with the bridge deck through the upright posts.
The invention also provides a construction method of the PBL stiffening type flat steel box concrete slab arch, which comprises the following steps:
a. dividing the main arch into at least one arch segment, processing a top plate, a bottom plate, side webs, a middle web, PBL stiffening ribs, a first diaphragm plate and a second diaphragm plate according to the structure and the size of the divided arch segment, welding the arch segment into the arch segment, and then coating and numbering the arch segment for storage;
b. conveying the arch segments to bridge positions, and connecting the arch segments according to the installation line shape of the main arch to finish the construction of the main arch steel structure;
c. a pumping jacking process is adopted, self-compaction micro-expansion shrinkage compensation concrete is symmetrically pumped from two arch feet of a main arch to the arch roof;
d. after the strength of the self-compaction micro-expansion shrinkage compensation concrete reaches the design requirement, the column is constructed, and finally the bridge deck structure is constructed.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the PBL stiffening flat steel box concrete slab arch provided by the invention, the steel box is used for replacing the traditional reinforcing mesh, so that the structural bearing capacity is improved, and meanwhile, the steel box can be used as a template, so that the construction is convenient and quick. Meanwhile, the PBL stiffening ribs are additionally arranged, so that the compressive strength of core concrete is improved, and the stability of the steel box wallboard is enhanced; moreover, the PBL stiffening ribs act as shearing members, the holes of the PBL stiffening ribs can enable concrete to be fully contacted with the stiffening ribs, so that the steel box and the concrete are connected into a whole, the combined effect of the steel and the concrete is improved, the arrangement mode of the PBL stiffening ribs is flexible, the use effect is good, and the practical problems of void diseases of the steel box and the concrete, short service life and the like can be effectively solved. The device has the advantages of simple structure, light dead weight, reasonable design, excellent mechanical property and high structural cost performance, and has good application prospect.
Further, the steel box is filled with self-compaction micro-expansion shrinkage compensation concrete, vibration is not needed in concrete construction, shrinkage stress of the concrete is small, and construction quality of the concrete is high.
According to the construction method of the PBL stiffening flat steel box concrete slab arch, provided by the invention, each part is processed according to the structure and the size of the main arch, each part is connected into the arch segments, then a plurality of arch segments are spliced into the main arch, and the steel box is used for replacing the traditional reinforcing mesh, so that the structural bearing capacity is improved, and meanwhile, the steel box can be used as a template, so that the construction is convenient and rapid, and the cost is lower. Meanwhile, the construction quality is easy to control by symmetrically pumping concrete from two arch legs of the main arch to the arch crown.
Drawings
FIG. 1 is a schematic structural view of an arch bridge;
FIG. 2 is a cross-sectional view A-A of an arch bridge;
FIG. 3 is a cross-sectional view of a primary arch of a first embodiment;
FIG. 4 is a cross-sectional view taken along section B-B of FIG. 2;
FIG. 5 is a schematic view of the structure of a middle web;
FIG. 6 is a cross-sectional view of a second diaphragm;
FIG. 7 is a cross-sectional view of a first diaphragm;
FIG. 8 is a schematic view of a second diaphragm;
FIG. 9 is a schematic view of the structure of the first diaphragm;
fig. 10 is a cross-sectional view of a main arch of a second embodiment.
In the figure, 1-1 is an arch segment; 1-2 is a top plate; 1-3 is a bottom plate; 1-4 are edge webs; 1-5 is concrete; 2 is a PBL stiffening rib; 3 is a middle web; 4 is a second through hole; 5 is a first through hole; 6 is a main arch; 7 is a column; 8 is a bridge deck; 9 is a first diaphragm; 10 is a second diaphragm; 11 is a round corner quadrilateral hole; and 12 is a overselded circular arc hole.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
the invention provides a PBL stiffening type flat steel box concrete slab arch, which is shown in figures 1 and 2 and comprises a main arch 6 formed by splicing one or more arch segments 1-1, wherein the dividing length and the dividing number of the arch segments 1-1 are mainly determined by the lifting capacity of a crane and the construction process. As shown in fig. 3 and 10, the arch segment 1-1 comprises a rectangular steel box, a plurality of PBL stiffening ribs 2 are arranged on the top plate 1-2, the bottom plate 1-3 and the inner wall of the side web plate 1-4 of the steel box along the arch axis direction, and the steel box is filled with concrete 1-5.
The steel box is used for replacing the traditional reinforcing mesh, so that the structural bearing capacity is improved, and meanwhile, the steel box can be used as a template, so that the construction is convenient and quick. Meanwhile, the PBL stiffening ribs 2 are additionally arranged, so that the compressive strength of the core concrete 1-5 is improved, and the stability of the steel box wallboard is enhanced; moreover, the PBL stiffening ribs 2 serve as shearing members, the holes of the PBL stiffening ribs 2 can enable the concrete 1-5 to be in full contact with the stiffening ribs, so that the steel box and the concrete 1-5 are connected into a whole, the combined effect of the steel and the concrete 1-5 is improved, the arrangement mode of the PBL stiffening ribs 2 is flexible, the use effect is good, and the practical problems of void diseases of the steel box and the concrete 1-5, short service life and the like can be effectively solved.
The main arch 6 of the invention is generally parabolic or catenary, the main arch 6 is fastened and connected with the bridge deck 8 of the arch bridge where the main arch 6 is positioned through a plurality of vertical upright posts 7, the cross sections of the upright posts 7 are circular, rectangular or other polygons, and the arrangement positions and the number of the upright posts 7 are determined according to design requirements. The bridge deck 8 is of a concrete 1-5 structure, a steel structure or a steel-concrete combined structure.
The steel box is a flat steel box with larger width and thickness, namely the length of the steel box is larger than the height. The steel box can be divided into a single chamber or a plurality of independent chambers along the length direction of the steel box according to design requirements.
Referring to fig. 3, as a first embodiment of the main arch 6, a plurality of middle webs 3 are provided in a steel box, upper and lower end surfaces of the middle webs 3 are respectively connected with a top plate 1-2 and a bottom plate 1-3 of the steel box, the interior of the steel box is divided into a plurality of chambers by the middle webs 3, and the chambers are filled with concrete 1-5. Here, referring to fig. 5, the middle web 3 is an open-pore steel plate, the middle web 3 is provided with a plurality of first through holes 5 along the central axis, the first through holes 5 are uniformly arranged when no special requirement exists, and the structures and the sizes of the plurality of first through holes 5 are the same. The main arch segment with special stress requirements is correspondingly adjusted according to the actual stress condition of the arch segment 1-1 at the distribution position of the main arch segment, wherein the distance between two adjacent first through holes 5 on the middle web plate 3 is smaller as the force born by the distribution position of the web plate 3 in the steel box is larger.
Referring to fig. 10, as a second embodiment of the main arch 6, a plurality of middle webs 3 are provided in the steel box, the middle webs 3 are solid plates, a plurality of PBL stiffening ribs 2 are provided on the middle webs 3 along the arch axis direction, the upper and lower end surfaces of the middle webs 3 are respectively connected with the top plate 1-2 and the bottom plate 1-3 of the steel box, the interior of the steel box is divided into a plurality of chambers by the middle webs 3, one chamber of the two adjacent chambers is filled with concrete 1-5, and the other chamber is a cavity.
The first embodiment and the second embodiment are different in that: the partial chambers of the second embodiment are filled with concrete 1-5, and the partial chambers are not filled with concrete 1-5; while all chambers of the first embodiment are filled with concrete 1-5. In addition, the side webs 1-4 of the second embodiment are of the same structure as the middle web 3, are solid steel plates and are provided with PBL stiffening ribs 2; while the middle web plate 3 of the first embodiment is provided with a plurality of first through holes 5 along the central axis. The two embodiments can be selected according to design and construction requirements.
The PBL stiffening ribs 2 are all distributed on the inner wall plate of the steel box along the arch axis in a through length mode, the distribution positions of the PBL stiffening ribs are perpendicular to the inner side wall of the steel box, the PBL stiffening ribs 2 are steel plates, a plurality of second through holes 4 are formed in the central axis of the PBL stiffening ribs 2, and the structures and the sizes of the second through holes 4 are the same.
Referring to fig. 4, a plurality of diaphragm plates are arranged in each cavity of the steel box according to the stress and the construction requirements along the direction perpendicular to the arch axis. The diaphragm plates are vertically arranged with the steel box, the diaphragm plates are rectangular steel plates with the same size as the inner cavity of the steel box, and the four corners of the diaphragm plates connected with the steel box are provided with 1/4 arc welding arc holes 12.
Referring to fig. 7 and 9, the diaphragms located in the respective chambers of the arch segments 1-1 at the arch of the main arch 6 are first diaphragms 9, and the first diaphragms 9 are solid plates.
Referring to fig. 6 and 8, the diaphragms in the chambers of the arch segments 1-1 at the rest of the main arch 6 are second diaphragms 10, and the middle of the second diaphragms 10 is provided with round-corner quadrilateral holes 11.
The steel box is filled with self-compaction micro-expansion shrinkage compensation concrete 1-5, vibration is not needed in the construction of the concrete 1-5, the shrinkage stress of the concrete 1-5 is small, and the construction quality of the concrete 1-5 is high.
The invention also provides a construction method of the PBL stiffening type flat steel box concrete slab arch, which comprises the following steps:
a. the main arch 6 is divided into several arch segments 1-1 according to design requirements. The components of the top plate 1-2, the bottom plate 1-3, the side webs 1-4, the middle web 3, the PBL stiffener 2, and the first diaphragm plate 9 and the second diaphragm plate 10 that make up the steel box are machined at the factory. The above members are welded into arch segments 1-1 according to design and construction requirements and processing lines, and then subjected to stage coating and numbering storage.
b. And conveying the manufactured arch segments 1-1 to the bridge site, and connecting the arch segments 1-1 according to the installation line shape of the main arch 6 by adopting a certain construction method to finish the construction of the steel structure of the main arch 6.
c. And filling the steel box with concrete 1-5 after closing the main arch 6, and symmetrically pumping the self-compaction micro-expansion shrinkage compensation concrete 1-5 from the two arch feet to the arch crown by adopting a pumping jacking process.
d. And after the strength of the concrete 1-5 meets the design requirement, constructing the arch upright post 7, and finally constructing the bridge deck 8 structure.
The first diaphragm 9 located at the arch crown is a solid steel plate, and plays a role of blocking concrete 1-5 pumped to the arch crown by different arch feet at two sides in the process of symmetrically pumping self-compacting micro-expansion shrinkage compensation concrete 1-5 from the two arch feet to the arch crown.
The invention has the following advantages: 1. simple structure, reasonable design, convenient construction, excellent mechanical property, easy control of construction quality, lower cost and high structural cost performance, and has good application prospect. 2. Compared with the masonry slab arch with the same span and the reinforced concrete slab arch, the invention has lighter dead weight and saves materials. 3. The steel box is used for replacing the reinforcing steel bar net, so that the structural bearing capacity is improved, and meanwhile, the steel box can be used as a template, so that the construction is convenient and quick. 4. The addition of the PBL stiffening ribs improves the compressive strength of core concrete and enhances the stability of the steel box wallboard; meanwhile, the PBL stiffening ribs act as shearing members, so that the steel box and the concrete 1-5 are connected into a whole, and the combined effect of the steel and the concrete 1-5 is improved. The PBL stiffening ribs 2 are flexible in arrangement mode and good in use effect, and can effectively solve the practical problems of void diseases of the steel box and the concrete 1-5, short service life and the like.
In conclusion, the invention can effectively solve the problems of complex construction procedures, large engineering quantity of brackets and templates, troublesome concrete vibration, large shrinkage stress and the like of the existing masonry and reinforced concrete slab arch.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural changes made to the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (4)
1. The PBL stiffening flat steel box concrete slab arch is characterized by comprising a main arch (6) formed by assembling at least one arch segment (1-1), wherein the arch segment (1-1) comprises a rectangular steel box, a plurality of PBL stiffening ribs (2) are arranged on the inner walls of a top plate (1-2), a bottom plate (1-3) and a side web (1-4) of the steel box along the arch axis direction, a plurality of second through holes (4) are formed in the central axis of the PBL stiffening ribs (2), and the shapes and the sizes of the plurality of second through holes (4) are the same;
the steel box is filled with concrete (1-5); the steel box is internally provided with a plurality of middle webs (3), the middle webs (3) are provided with a plurality of first through holes (5), the upper end face and the lower end face of the middle webs (3) are respectively connected with a top plate (1-2) and a bottom plate (1-3) of the steel box, the interior of the steel box is divided into a plurality of chambers by the middle webs (3), and the chambers are filled with concrete (1-5);
the first through holes (5) are positioned on the central axis of the middle web plate (3), and the shapes and the sizes of the first through holes (5) are the same; the larger the force born by the middle web plate (3), the smaller the distance between two adjacent first through holes (5);
when the middle web plate (3) is a solid plate, a plurality of PBL stiffening ribs (2) are arranged on the middle web plate (3) along the arch axis direction, the upper end face and the lower end face of the middle web plate (3) are respectively connected with a top plate (1-2) and a bottom plate (1-3) of a steel box, the interior of the steel box is divided into a plurality of chambers through the middle web plate (3), concrete (1-5) is filled in one chamber of two adjacent chambers, and the other chamber is a cavity;
the steel box is flat, and the length of the steel box is longer than the height;
the line shape of the main arch (6) is parabolic or catenary, and the main arch (6) is connected with the bridge deck (8) through the upright post (7); a first diaphragm plate (9) is arranged in each cavity of the arch segment (1-1) at the arch top of the main arch (6), the first diaphragm plate (9) is a solid plate, the first diaphragm plate (9) is respectively connected with the top plate (1-2), the bottom plate (1-3) and two adjacent middle webs (3) of the steel box, or the first diaphragm plate (9) is respectively connected with the top plate (1-2), the bottom plate (1-3), the side webs (1-4) and the middle webs (3) of the steel box;
a plurality of second diaphragm plates (10) are arranged in each cavity of the arch segments (1-1) at the rest positions of the main arch (6), round corner quadrilateral holes (11) are formed in the middle of each second diaphragm plate (10), each second diaphragm plate (10) is respectively connected with the top plate (1-2), the bottom plate (1-3) and two adjacent middle webs (3) of the steel box, or each second diaphragm plate (10) is respectively connected with the top plate (1-2), the bottom plate (1-3), the side webs (1-4) and the middle webs (3) of the steel box;
the middle web plate (3), the first diaphragm plate (9), the second diaphragm plate (10) and the PBL stiffening rib (2) are all steel plates;
the concrete (1-5) is self-compacting micro-expansion shrinkage compensation concrete.
2. The PBL stiffened flat steel box concrete slab arch according to claim 1, wherein the four corners of the first diaphragm plate (9) and the second diaphragm plate (10) are provided with 1/4 arc overselded arc holes (12).
3. The PBL stiffened flat steel box concrete slab arch according to claim 1, wherein the PBL stiffeners (2) are perpendicular to the top plate (1-2), bottom plate (1-3) or edge webs (1-4) to which they are connected.
4. A construction method of the PBL stiffened flat steel box concrete slab arch according to any one of claims 1 to 3, comprising the steps of:
a. dividing a main arch (6) into at least one arch segment (1-1), processing a top plate (1-2), a bottom plate (1-3), a side web plate (1-4), a middle web plate (3), a PBL stiffening rib (2), a first diaphragm plate (9) and a second diaphragm plate (10) according to the structure and the size of the divided arch segment (1-1), welding the arch segment (1-1), and then coating and numbering the arch segment (1-1);
b. conveying the arch segments (1-1) to the bridge site, connecting the arch segments (1-1) according to the installation line shape of the main arch (6), and completing the construction of the steel structure of the main arch (6);
c. a pumping jacking process is adopted, self-compaction micro-expansion shrinkage compensation concrete is symmetrically pumped from two arch feet of a main arch (6) to the arch roof;
d. after the strength of the self-compaction micro-expansion shrinkage compensation concrete reaches the design requirement, the vertical column (7) is constructed, and finally the bridge deck (8) structure is constructed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710596861.4A CN107227682B (en) | 2017-07-20 | 2017-07-20 | PBL stiffening type flat steel box concrete slab arch and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710596861.4A CN107227682B (en) | 2017-07-20 | 2017-07-20 | PBL stiffening type flat steel box concrete slab arch and construction method thereof |
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| CN107227682A CN107227682A (en) | 2017-10-03 |
| CN107227682B true CN107227682B (en) | 2023-11-07 |
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|---|---|---|---|---|
| CN111809659A (en) * | 2020-06-23 | 2020-10-23 | 深圳市居安建筑科技有限公司 | Underground long longitudinal structure concrete shrinkage stress restraint system of subway |
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