CN111172886A - Construction method of main arch and auxiliary arch of double-flying-wing arch bridge and temporary support used by same - Google Patents
Construction method of main arch and auxiliary arch of double-flying-wing arch bridge and temporary support used by same Download PDFInfo
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- CN111172886A CN111172886A CN202010087940.4A CN202010087940A CN111172886A CN 111172886 A CN111172886 A CN 111172886A CN 202010087940 A CN202010087940 A CN 202010087940A CN 111172886 A CN111172886 A CN 111172886A
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- 238000010276 construction Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 71
- 239000010959 steel Substances 0.000 claims description 71
- 238000003825 pressing Methods 0.000 claims description 20
- 238000002474 experimental method Methods 0.000 claims description 10
- 238000005056 compaction Methods 0.000 claims description 6
- 230000005489 elastic deformation Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling 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
- E01D4/00—Arch-type bridges
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Abstract
A temporary support for construction of main and auxiliary arches of a double-flying-wing arch bridge comprises two main and auxiliary arch crossing sections, a main arch non-crossing section, two first auxiliary arch non-crossing sections, a second auxiliary arch non-crossing section and a main and auxiliary arch support transverse connection. The main and auxiliary arch crossing section comprises a crossing section main arch temporary pier bracket and a crossing section auxiliary arch temporary pier bracket fixed with the top of the crossing section main arch temporary pier bracket; the main arch non-crossing section is positioned between the two main and auxiliary arch crossing sections; the two first auxiliary arch non-crossing sections are respectively positioned on one side of the two main auxiliary arch crossing sections, which is back to the main arch non-crossing sections; the second auxiliary arch non-crossing section is positioned between the two main auxiliary arch crossing sections and comprises a plurality of second non-crossing section auxiliary arch temporary pier supports, one side of each second non-crossing section auxiliary arch temporary pier support is supported on the main beam, and the other side of each second non-crossing section auxiliary arch temporary pier support is fixed with the main beam support; the main and auxiliary arch support is connected with the second non-crossed section and auxiliary arch temporary pier support and the main arch non-crossed section in a transverse connection manner; the method is suitable for the construction of the main arch and the auxiliary arch of the double-flying-wing arch bridge. The invention also provides a construction method of the main arch and the auxiliary arch of the double-flying-wing arch bridge.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a construction method of a main arch and an auxiliary arch of a double-flying-wing arch bridge and a temporary support used by the same.
Background
The arch rib of the conventional arch bridge is generally composed of a pair of vertical parallel arch ribs, and the installation of the arch rib generally adopts cable hoisting construction, bracket construction, swivel construction and the like. With the development of bridge construction technology and the improvement of urban arch bridge ornamental value, the double flying wing arch bridge is concerned and popularized. Referring to fig. 1, the dual-wing arch bridge 300 generally includes a main girder 310 formed by a steel box and two arch ribs 320 disposed at opposite sides of the main girder 310, wherein each of the two arch ribs 320 includes a main arch 321 inclined outward and a sub-arch 323 inclined inward, and the main arch 321 and the sub-arch 323 intersect each other within a certain range. The traditional arch rib installation process can well meet the installation of vertical parallel arch ribs or single-side inclined arch ribs, but cannot meet the construction of crossed main and auxiliary arches, or additionally increases labor cost, construction period and material cost in the construction, and has larger potential safety hazards in construction.
Disclosure of Invention
The present invention is intended to solve at least one of the above problems, and to provide a method for constructing a main arch and a secondary arch of a double-flying-wing arch bridge, and a temporary support used therefor.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a temporary support for construction of main and auxiliary arches of double-flying-wing arch bridge comprises
The main-auxiliary arch crossing sections are distributed at intervals along the bridge direction, each main-auxiliary arch crossing section comprises a crossing section main arch temporary pier support erected along the extending direction of a crossing area main arch and a crossing section auxiliary arch temporary pier support erected along the extending direction of the crossing area auxiliary arch, the top of each crossing section main arch temporary pier support is used for supporting a main arch, the bottom of each crossing section auxiliary arch temporary pier support is fixed with the corresponding crossing section main arch temporary pier support, and the top of each crossing section auxiliary arch temporary pier support is used for supporting an auxiliary arch;
the main arch non-crossed section is positioned between two main and auxiliary arch crossed sections and comprises a plurality of non-crossed section main arch temporary pier supports erected along the camber direction of the main arch of the non-crossed section;
the two first auxiliary arch non-crossed sections are respectively positioned on one side of the two main auxiliary arch crossed sections, which faces away from the main arch non-crossed sections, and each first auxiliary arch non-crossed section comprises a plurality of first non-crossed section auxiliary arch temporary pier supports erected along the inwards inclining direction of the auxiliary arches of the non-crossed sections;
the second auxiliary arch non-crossing section is positioned between the two main auxiliary arch crossing sections and is closer to a main beam of the double-flying wing arch bridge than the main arch non-crossing sections, the second auxiliary arch non-crossing section comprises a plurality of second non-crossing section auxiliary arch temporary pier supports erected along the inwards inclining direction of the auxiliary arches of the non-crossing sections, one side, close to the main beam, of each second non-crossing section auxiliary arch temporary pier support is supported on the main beam, and one side, close to the main arch non-crossing sections, of each second non-crossing section auxiliary arch temporary pier support is fixed with the main beam supports; and
and the main and auxiliary arch support is transversely connected with the second non-intersecting section auxiliary arch temporary pier support and the non-intersecting section main arch temporary pier support.
Furthermore, the crossed section main arch temporary pier support, the crossed section auxiliary arch temporary pier support, the non-crossed section main arch temporary pier support, the first non-crossed section auxiliary arch temporary pier support and the second non-crossed section auxiliary arch temporary pier support respectively comprise a plurality of steel pipe columns, horizontal cross rods for vertically connecting two adjacent steel pipe columns and inclined struts for connecting two adjacent steel pipe columns, and pier top cross beams are fixed at the tops of the steel pipe columns; the main and auxiliary arch support is transversely connected with the steel pipe column of the second non-crossed section auxiliary arch temporary pier support and the steel pipe column of the non-crossed section main arch temporary pier support; the steel pipe column of the crossed section auxiliary arch temporary pier bracket is fixed with the steel pipe column of the crossed section main arch temporary pier bracket; the steel pipe column of the second non-cross section secondary arch temporary pier support close to the main beam is supported on the main beam, and the steel pipe column of the second non-cross section secondary arch temporary pier support close to the main arch non-cross section is fixed with the main beam support.
Further, the steel pipe column of the second non-crossed section auxiliary arch temporary pier support is coaxial with the steel pipe column of the main beam support.
Furthermore, a hook is fixed at the bottom of the steel pipe column for connecting with the pile foundation.
Furthermore, pier cross connections are arranged among the crossed section main arch temporary pier supports, the crossed section auxiliary arch temporary pier supports, the non-crossed section main arch temporary pier supports, the first non-crossed section auxiliary arch temporary pier supports and the second non-crossed section auxiliary arch temporary pier supports according to preset steps.
Furthermore, the main and auxiliary arch support transverse connection is horizontally arranged and comprises multiple groups, the multiple groups of main and auxiliary arch support transverse connections are arranged at intervals along the bridge direction, and a plurality of main and auxiliary arch support transverse connections are arranged along the vertical direction of each group of main and auxiliary arch support transverse connections.
Furthermore, jacks are arranged at the top of the crossed section main arch temporary pier support, the top of the crossed section auxiliary arch temporary pier support, the top of the non-crossed section main arch temporary pier support, the top of the first non-crossed section auxiliary arch temporary pier support and the top of the second non-crossed section auxiliary arch temporary pier support, and the jacks are connected with the wedge blocks.
Further, the main and auxiliary arch support cross-linkage comprises an upper chord, a lower chord, web members and diagonal members, the upper chord and the lower chord are arranged at intervals in the vertical direction and are parallel to each other, the two opposite ends of the upper chord and the two opposite ends of the lower chord are uniformly distributed on the steel pipe columns of the second non-crossed section auxiliary arch temporary pier support and the steel pipe columns of the non-crossed section main arch temporary pier support, the web members are vertically connected with the upper chord and the lower chord, and the diagonal members are connected with the upper chord and the lower chord.
The invention also provides a construction method of the main arch and the auxiliary arch of the double flying wing arch bridge, which comprises the following steps,
mounting a bracket: installing the temporary support;
pre-pressing a support: performing a support pre-pressing experiment on the temporary support;
and (4) checking and accepting the bracket: after the inspection index of support pre-compaction experiment satisfies the construction requirement, get into the support and examine the acceptance link, according to the data adjustment girder bottom elevation of pre-compaction experiment, girder bottom elevation formula is as follows: h ', H + P, wherein H' is the elevation of the main beam bottom, and H is the elevation of the designed main beam bottom; and P is the elastic deformation value of the temporary pier bracket prepressing.
Hoisting arch ribs: and after the support acceptance is finished, hoisting the arch rib to the temporary support for assembly.
Further, in the support preloading, the preloading load is loaded for 4 times, the preloading load of the first time is 25% of the weight of the arch rib segment, the preloading load of the second time is 75% of the weight of the arch rib segment, the preloading load of the third time is 100% of the weight of the arch rib segment, the preloading load of the fourth time is 110% of the weight of the arch rib segment, and the loading duration is 24 hours each time.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the invention provides a construction method of a main arch and an auxiliary arch of a double-flying-wing arch bridge and a temporary support used by the construction method, aiming at the defects of the existing construction method in installation of arch ribs of the double-flying-wing arch bridge, the construction method comprises the steps of dividing a main arch support system and an auxiliary arch support system by arranging a main arch cross section, a main arch non-cross section, an auxiliary arch non-cross section, a main arch support and an auxiliary arch support transverse connection and the like, connecting the support systems by the main arch support and the auxiliary arch support transverse connection to ensure the integral stress, and completing the installation of the arch ribs by four steps of support installation, support pre-pressing, support acceptance and arch rib hoisting. The invention breaks the whole into parts, divides the camber main arch and the camber auxiliary arch into single-side inclined arch ribs for construction, reduces the cost of manpower and materials, shortens the construction period and improves the construction safety.
Drawings
Fig. 1 is a schematic top view of a double-flying-wing arch bridge.
Fig. 2 is a schematic top view of a temporary stand according to a preferred embodiment of the present invention.
Fig. 3 is a view showing a state of use of the temporary stand shown in fig. 2.
Fig. 4 is a front view of a main arch temporary pier support and a main arch non-crossing section of the temporary support shown in fig. 2.
Fig. 5 is a front view of the temporary pier supports of the main arch of the cross section, the temporary pier supports of the auxiliary arch of the cross section, the non-cross section of the first auxiliary arch and the non-cross section of the second auxiliary arch in the temporary support shown in fig. 2.
Fig. 6 is a schematic cross-sectional view of the temporary stand shown in fig. 2 at the cross-section of the primary and secondary arch stands.
Fig. 7 is a schematic structural diagram of a crossed section main arch temporary pier bracket, a crossed section auxiliary arch temporary pier bracket, a non-crossed section main arch temporary pier bracket, a first non-crossed section auxiliary arch temporary pier bracket and a second non-crossed section auxiliary arch temporary pier bracket in the preferred embodiment of the invention.
Fig. 8 is an enlarged view of fig. 7 at a.
Fig. 9 is an enlarged view of fig. 7 at B.
Fig. 10 is a partial structural view of a temporary support at the crossing section of the main arch and the auxiliary arch in the preferred embodiment of the invention.
Description of the main elements
100. A temporary support; 2. a main and auxiliary arch crossing section; 21. a main arch temporary pier bracket of the cross section; 23. a temporary pier bracket of the cross section auxiliary arch; 3. a main arch non-intersecting section; 31. a non-crossed section main arch temporary pier bracket; 4. a first secondary arch non-intersecting segment; 41. a first non-crossed section auxiliary arch temporary pier bracket; 5. a second secondary arch non-intersecting segment; 51. a second non-crossed section auxiliary arch temporary pier bracket; 6. the main and auxiliary arch brackets are transversely connected; 61. an upper chord; 63. a lower chord; 65. a web member; 67. a diagonal bar; 71. steel pipe columns; 73. a horizontal cross bar; 75. bracing; 76. hooking; 77. a jack; 78. a wedge block; 79. a pier top beam; 8. the piers are connected transversely; 200. pile foundations; 300. a double-flying-wing arch bridge; 310. a main beam; 320. an arch rib; 321. a main arch; 323. a secondary arch; 400. a main beam support.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 3, a preferred embodiment of the present invention provides a method for constructing a primary arch and a secondary arch of a dual-wing arch bridge, including the following steps:
s1, mounting a bracket: and installing a temporary support 100 for the construction of the main arch and the auxiliary arch of the double-flying-wing arch bridge. The temporary support 100 comprises two main and auxiliary arch crossing sections 2, a main arch non-crossing section 3, two first auxiliary arch non-crossing sections 4, a second auxiliary arch non-crossing section 5 and a plurality of main and auxiliary arch support cross links 6.
Referring to fig. 4, 5 and 10 together, two main-auxiliary arch crossing sections 2 are distributed at intervals along the bridge direction, each main-auxiliary arch crossing section 2 includes a crossing section main arch temporary pier support 21 erected along the extending direction of the crossing section main arch 321 and a crossing section auxiliary arch temporary pier support 23 erected along the extending direction of the crossing section auxiliary arch 323, the top of the crossing section main arch temporary pier support 21 is used for supporting the crossing section main arch 321, the bottom of the crossing section auxiliary arch temporary pier support 23 is fixed with the top of the crossing section main arch temporary pier support 21, and the top of the crossing section auxiliary arch temporary pier support 23 is used for supporting the crossing section auxiliary arch 323.
Referring to fig. 7 to 9 together, in the present embodiment, each of the cross-section main-arch temporary pier support 21 and the cross-section sub-arch temporary pier support 23 includes a plurality of steel pipe columns 71, horizontal cross bars 73 vertically connecting two adjacent steel pipe columns 71, and diagonal braces 75 connecting two adjacent steel pipe columns 71. The steel pipe column 71 is vertically disposed. Wherein, the bottom end of the steel pipe column 71 of the crossed section main arch temporary pier bracket 21 is used for being installed on the pile foundation 200, preferably, the steel pipe column 71 is uplift-resistant, and the side surface of the bottom end of the steel pipe column 71 is welded with a hook 76; the bottom end of the steel pipe column 71 of the crossed section auxiliary arch temporary pier bracket 23 is fixed with the top end of the steel pipe column 71 of the crossed section main arch temporary pier bracket 21. The top of the steel pipe column 71 is fixed with a top beam 79, the two opposite ends of the top beam 79 are respectively fixed with the two adjacent steel pipe columns 71, wherein the top beam 79 of the crossed section main arch temporary pier support 21 is used for supporting the main arch 321, and the top beam 79 of the crossed section auxiliary arch temporary pier support 23 is used for supporting the auxiliary arch 323. The pier top beam 79 is preferably made of i-steel.
Referring to fig. 1, 2 and 4 again, the main arch non-crossing section 3 is located between two main and auxiliary arch crossing sections 2, and the main arch non-crossing section 3 includes a plurality of non-crossing section main arch temporary pier supports 31 erected along the camber direction of the non-crossing section main arch 321. Referring to fig. 7 to 9 together, in the present embodiment, the structure of the non-intersecting section main arch temporary pier support 31 is the same as that of the intersecting section main arch temporary pier support 21, and each of the non-intersecting section main arch temporary pier supports includes a plurality of steel pipe columns 71, horizontal cross bars 73 vertically connecting two adjacent steel pipe columns 71, and diagonal braces 75 connecting two adjacent steel pipe columns 71. The steel pipe column 71 is vertically arranged, and the bottom end of the steel pipe column 71 is used for being mounted on the pile foundation 200. Preferably, for resistance to pull-out, the side of the bottom end of the steel pipe column 71 is welded with a hook 76. A pier cross member 79 for supporting the main arch 321 is fixed to the top end of the steel pipe column 71.
Referring to fig. 1, 2 and 5, two first auxiliary arch non-crossing sections 4 are respectively located on one side of the two main auxiliary arch crossing sections 2 opposite to the main arch non-crossing sections 3, and each first auxiliary arch non-crossing section 4 comprises a plurality of first non-crossing section auxiliary arch temporary pier supports 41 erected along the inward inclination direction of the non-crossing section auxiliary arch 323. Referring to fig. 7 to 9 together, in the present embodiment, the first non-intersecting section sub-arch temporary pier support 41 has the same structure as the intersecting section main arch temporary pier support 21, and includes a plurality of steel pipe columns 71, horizontal cross bars 73 vertically connecting two adjacent steel pipe columns 71, and diagonal braces 75 connecting two adjacent steel pipe columns 71. The steel pipe column 71 is vertically arranged, and the bottom end of the steel pipe column 71 is used for being mounted on the pile foundation 200. Preferably, for resistance to pull-out, the side of the bottom end of the steel pipe column 71 is welded with a hook 76. A pier top beam 79 for supporting the auxiliary arch 323 is fixed to the top end of the steel pipe column 71.
Referring to fig. 6, the second secondary arch non-crossing section 5 is located between the two main and secondary arch crossing sections 2 and is closer to the main girder 310 of the dual-wing arch bridge 300 than the main arch non-crossing section 3, the second secondary arch non-crossing section 5 includes a plurality of second non-crossing section secondary arch temporary pier supports 51 erected along the inward-inclining direction of the non-crossing section secondary arch 323, one side of the second non-crossing section secondary arch temporary pier support 51 close to the main girder 310 is supported on the main girder 310, and one side of the second non-crossing section secondary arch temporary pier support 51 close to the main arch non-crossing section 3 is fixed with the main girder support 400.
Referring to fig. 7 to 9 together, in the present embodiment, the second non-intersecting section sub-arch temporary pier support 51 has substantially the same structure as the intersecting section main arch temporary pier support 21, and includes a plurality of steel pipe columns 71, horizontal cross bars 73 vertically connecting the two adjacent steel pipe columns 71, and diagonal braces 75 connecting the two adjacent steel pipe columns 71. The steel pipe columns 71 are vertically arranged, wherein the bottom ends of the steel pipe columns 71 close to one side of the main beam 310 are supported on the main beam 310, and the bottom ends of the steel pipe columns 71 close to one side of the main arch non-crossing section 3 are fixed with the main beam support 400. The girder support 400 is a temporary support for the construction of the girder 310, and the structure thereof belongs to the prior art and is not described herein for brevity. Preferably, the steel pipe columns 71 of the second non-intersecting segment secondary arch temporary pier support 51 are coaxial with the steel pipe columns of the main girder support 400 to ensure that the secondary arch segment loads can be vertically transferred to the support foundation through the main girder 310 and the main girder support 400.
The main and auxiliary arch support transverse connection 6 connects the second non-cross section auxiliary arch temporary pier support 51 with the non-cross section main arch temporary pier support 31. In the present embodiment, the main-auxiliary arch support cross-link 6 is horizontally disposed, and the main-auxiliary arch support cross-link 6 connects the steel pipe column 71 of the second non-intersecting section auxiliary arch temporary pier support 51 with the steel pipe column 71 of the non-intersecting section main arch temporary pier support 31; the main and auxiliary arch support transverse connection 6 comprises a plurality of groups, the main and auxiliary arch support transverse connections 6 of the plurality of groups are arranged at intervals along the bridge direction, and the main and auxiliary arch support transverse connections 6 of each group are provided with a plurality of main and auxiliary arch support transverse connections 6 along the vertical direction. Each main and auxiliary arch support cross-link 6 comprises an upper chord 61, a lower chord 63, a web member 65 and an oblique member 67. The upper chord 61 and the lower chord 63 are arranged at intervals in the vertical direction, the upper chord 61 and the lower chord 63 are parallel to the horizontal direction, and the two opposite ends of the upper chord 61 and the two opposite ends of the lower chord 63 are respectively and vertically fixed with the steel pipe column 71 of the second non-crossed section auxiliary arch temporary pier support 51 and the steel pipe column 71 of the non-crossed section main arch temporary pier support 31. The web member 65 is connected perpendicularly to the upper and lower chords 61, 63. The diagonal member 67 is disposed obliquely, and opposite ends thereof respectively connect the upper chord 61 and the lower chord 63.
In the embodiment, the inter-pier cross links 8 are arranged between the main-arch temporary pier supports 21 of the cross section, between the auxiliary-arch temporary pier supports 23 of the cross section, between the main-arch temporary pier supports 31 of the non-cross section, between the auxiliary-arch temporary pier supports 41 of the first non-cross section and between the auxiliary-arch temporary pier supports 51 of the second non-cross section according to preset steps, the two opposite ends of each inter-pier cross link 8 are respectively connected with corresponding steel pipe columns 71, and the steps can be designed according to actual working conditions. The integrity and stability of the temporary support 100 can be further improved by arranging the inter-pier cross links 8.
Referring to fig. 7 to 9 again, jacks 77 are fixed on the top beams 79 of the crossed section main arch temporary pier supports 21, the top beams 79 of the crossed section auxiliary arch temporary pier supports 23, the top beams 79 of the non-crossed section main arch temporary pier supports 31, the top beams 79 of the first non-crossed section auxiliary arch temporary pier supports 41 and the top beams 79 of the second non-crossed section auxiliary arch temporary pier supports 51, the jacks 77 are connected with wedge blocks 78, and the wedge blocks 78 are used for supporting the main arch 321 or the auxiliary arch 323. When the temporary support is used, the wedge block 78 can be driven to move vertically through the jack 77, so that the height position of the wedge block 78 is adjusted, and the main arch 321 or the auxiliary arch 323 can be further supported on the temporary support 100.
S2, pre-pressing the support, namely, performing a support pre-pressing experiment on the temporary support 100 to verify the stability of the temporary support 100, pre-pressing load is loaded for 4 times during support pre-pressing, and pre-pressing is performed to simulate the weight distribution condition of a beam body so as to be in line with reality as much as possible, in the embodiment, a concrete precast block is used for pre-pressing at the top of the temporary support 100, a hanging ring is arranged at the top of the concrete precast block to facilitate hoisting, in the pre-pressing experiment, an electronic level is used for measuring 3 times of average value taking based on national elevation system unified station observation, reading is recorded as accurate as 0.1mm, pre-pressing mainly collects the following data, namely, settlement data of the temporary support 21 of the main arch of the cross section, the temporary support 23 of the secondary arch of the cross section, the temporary support 23 of the non-cross section, the temporary support 31 of the main arch of the non-cross section, the temporary support 23 of the non-cross section, the secondary arch support 41 of the non-cross section, the temporary support 51 of the non-cross secondary arch, the main arch support of the cross section and the non-temporary support 51, the non-temporary support of the cross secondary arch, the cross section, the main arch support of the cross section, the non-temporary support of the cross section, the secondary arch, the non-temporary support of the cross section, the non-temporary support 23, the non-temporary support of the cross secondary arch, and the non-temporary support of the cross secondary arch 51 of the cross secondary arch, and the cross secondary arch, the non-temporary support of the cross.
Preferably, the pre-load takes into account the most adverse load conditions, i.e. 1/2 of the maximum weight of the adjacent two segments of ribs 320, in this embodiment, the first load is 25% of the weight of the rib segment, the second load is 75% of the weight of the rib segment, the third load is 100% of the weight of the rib segment, the fourth load is 110% of the weight of the rib segment, and each holding time is 24 hours, to further improve the production safety.
S3, checking and accepting the stent: after the inspection index of support pre-compaction experiment satisfies the construction requirement, get into the support and examine the acceptance link, according to the corresponding girder bottom elevation of data adjustment of pre-compaction experiment, girder bottom elevation formula is as follows: h ', H + P, wherein H' is the elevation of the main beam bottom, and H is the elevation of the designed main beam bottom; p is an elastic deformation value of the prepressing of the crossed section main arch temporary pier bracket 21, the crossed section auxiliary arch temporary pier bracket 23, the non-crossed section main arch temporary pier bracket 31, the first non-crossed section auxiliary arch temporary pier bracket 41 and the second non-crossed section auxiliary arch temporary pier bracket 51.
S4, arch rib hoisting: after the support acceptance is completed, the arch rib 320 is hoisted to the temporary support 100 for assembly. During hoisting, the main arch 321 can be hoisted first, and then the auxiliary arch 323 can be hoisted, or the main arch 321 and the auxiliary arch 323 can be hoisted simultaneously. The hoisting of the arch rib belongs to the prior art and is not described herein for brevity.
Aiming at the defects of the existing construction method in the installation of 300 arch ribs 320 of the double-flying-wing arch bridge, the embodiment of the invention provides a construction method of a main arch and an auxiliary arch of the double-flying-wing arch bridge and a temporary support 100 used by the construction method, wherein a main arch support system and an auxiliary arch support system are divided by arranging a main arch cross section 2, a main arch non-cross section 3, an auxiliary arch non-cross section, a main arch support transverse connection 6 and the like, all the support systems are connected by the main arch support transverse connection 6 to ensure the integral stress, and the installation of the arch ribs 320 is completed by four steps of support installation, support prepressing, support acceptance and arch rib 320 hoisting. The invention breaks the whole into parts, divides the camber main arch 321 and the camber auxiliary arch 323 into single-side inclined arch ribs 320 for construction, and fully utilizes the main beam 310 and the main beam bracket 400, so that the hoisting of the main arch 321 and the auxiliary arch 323 cannot be influenced mutually, thereby reducing the cost of manpower and materials, shortening the construction period and improving the construction safety.
The above description is intended to describe in detail the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the claims of the present invention, and all equivalent changes and modifications made within the technical spirit of the present invention should fall within the scope of the claims of the present invention.
Claims (10)
1. A temporary support (100) for the construction of main and auxiliary arches of a double-flying-wing arch bridge is characterized by comprising
The bridge comprises two main and auxiliary arch crossing sections (2), wherein the two main and auxiliary arch crossing sections (2) are distributed at intervals along the bridge direction, each main and auxiliary arch crossing section (2) comprises a crossing section main arch temporary pier support (21) erected along the extending direction of a crossing area main arch (321) and a crossing section auxiliary arch temporary pier support (23) erected along the extending direction of a crossing area auxiliary arch (323), the top of each crossing section main arch temporary pier support (21) is used for supporting the main arch (321), the bottom of each crossing section auxiliary arch temporary pier support (23) is fixed with the crossing section main arch temporary pier support (21), and the top of each crossing section auxiliary arch temporary pier support (23) is used for supporting the auxiliary arch (323);
the main arch non-crossed section (3) is positioned between two main and auxiliary arch crossed sections (2), and the main arch non-crossed section (3) comprises a plurality of non-crossed section main arch temporary pier supports (31) erected along the camber direction of a non-crossed section main arch (321);
the two first auxiliary arch non-crossing sections (4) are respectively positioned on one side, opposite to the main arch non-crossing section (3), of the two main and auxiliary arch crossing sections (2), and each first auxiliary arch non-crossing section (4) comprises a plurality of first non-crossing section auxiliary arch temporary pier supports (41) erected along the inwards inclining direction of the non-crossing section auxiliary arch (323);
a second auxiliary arch non-crossing section (5), wherein the second auxiliary arch non-crossing section (5) is positioned between two main auxiliary arch crossing sections (2) and is closer to a main girder (310) of the double-flying wing arch bridge (300) than the main arch non-crossing section (3), the second auxiliary arch non-crossing section (5) comprises a plurality of second non-crossing section auxiliary arch temporary pier brackets (51) erected along the inward inclining direction of a non-crossing section auxiliary arch (323), one side of the second non-crossing section auxiliary arch temporary pier brackets (51) close to the main girder (310) is supported on the main girder (310), and one side of the second non-crossing section auxiliary arch temporary pier brackets (51) close to the main arch non-crossing section (3) is fixed with the main girder brackets (400); and
and the main and auxiliary arch support transverse connection (6) is connected with the second non-intersecting section auxiliary arch temporary pier support (51) and the non-intersecting section main arch temporary pier support (31).
2. The temporary support (100) for the construction of the main arch and the auxiliary arch of the double-flying-wing arch bridge according to claim 1, wherein the temporary support (21) for the main arch of the cross section, the temporary support (23) for the auxiliary arch of the cross section, the temporary support (31) for the main arch of the non-cross section, the temporary support (41) for the auxiliary arch of the first non-cross section and the temporary support (51) for the auxiliary arch of the second non-cross section each comprise a plurality of steel pipe columns (71), horizontal cross rods (73) for vertically connecting two adjacent steel pipe columns (71) and inclined struts (75) for connecting two adjacent steel pipe columns (71), and a top beam (79) is fixed at the top of each steel pipe column (71); the main and auxiliary arch support transverse connection (6) is used for connecting the steel pipe column (71) of the second non-crossed section auxiliary arch temporary pier support (51) with the steel pipe column (71) of the non-crossed section main arch temporary pier support (31); the steel pipe column (71) of the crossed section auxiliary arch temporary pier bracket (23) is fixed with the steel pipe column (71) of the crossed section main arch temporary pier bracket (21); the steel pipe column (71) of the second non-crossed section auxiliary arch temporary pier bracket (51) close to the main beam (310) is supported on the main beam (310), and the steel pipe column (71) of the second non-crossed section auxiliary arch temporary pier bracket (51) close to the main arch non-crossed section (3) is fixed with the main beam bracket (400).
3. The temporary support (100) for the construction of the main arch and the auxiliary arch of the double-flying-wing arch bridge according to claim 2, wherein the steel pipe column (71) of the second non-crossed section auxiliary arch temporary pier support (51) is coaxial with the steel pipe column of the main girder support (400).
4. The temporary support (100) for the construction of the main arch and the auxiliary arch of the double-flying-wing arch bridge according to claim 2, wherein a hook (76) is fixed to the bottom of the steel pipe column (71) for connecting with the pile foundation (200).
5. The temporary supports (100) for the construction of the main and auxiliary arches of the double flying wing arch bridge as claimed in claim 1, wherein the inter-pier cross-connections (8) are arranged at preset steps among the temporary support supports (21) of the main arches of the cross sections, among the temporary support supports (23) of the auxiliary arches of the cross sections, among the temporary support supports (31) of the main arches of the non-cross sections, among the temporary support supports (41) of the auxiliary arches of the first non-cross sections and among the temporary support supports (51) of the auxiliary arches of the second non-cross sections.
6. The temporary support (100) for the construction of the main arch and the auxiliary arch of the double flying wing arch bridge as claimed in claim 1, wherein the main arch support cross-links (6) and the auxiliary arch support cross-links (6) are horizontally arranged, the main arch support cross-links and the auxiliary arch support cross-links (6) comprise a plurality of groups, the plurality of groups of main arch support cross-links and auxiliary arch support cross-links (6) are arranged at intervals along the bridge direction, and each group of main arch support cross-links and auxiliary arch support cross-links (6) is provided with a plurality of main arch support cross-links and auxiliary arch.
7. The temporary support (100) for the construction of the main arch and the auxiliary arch of the double-flying-wing arch bridge as claimed in claim 1, wherein jacks (77) are arranged at the top of the crossed section main arch temporary pier support (21), the top of the crossed section auxiliary arch temporary pier support (23), the top of the non-crossed section main arch temporary pier support (31), the top of the first non-crossed section auxiliary arch temporary pier support (41) and the top of the second non-crossed section auxiliary arch temporary pier support (51), and the jacks (77) are connected with the wedge-shaped blocks (78).
8. The temporary support (100) for the construction of the main arch and the secondary arch of the double-flying-wing arch bridge as claimed in claim 1, wherein the main and secondary arch support cross-link (6) comprises an upper chord (61), a lower chord (63), web members (65) and diagonal members (67), the upper chord (61) and the lower chord (63) are vertically spaced and parallel to each other, opposite ends of the upper chord (61) and opposite ends of the lower chord (63) are respectively vertically fixed with the steel pipe column (71) of the second non-intersecting secondary arch temporary support (51) and the steel pipe column (71) of the non-intersecting primary arch temporary support (31), the web members (65) are vertically connected with the upper chord (61) and the lower chord (63), and the diagonal members (67) connect the upper chord (61) and the lower chord (63).
9. A construction method of a main arch and an auxiliary arch of a double-flying-wing arch bridge is characterized by comprising the following steps,
mounting a bracket: installing the temporary support (100) of claim 1;
pre-pressing a support: performing a stent pre-pressing experiment on the temporary stent (100);
and (4) checking and accepting the bracket: after the inspection index of support pre-compaction experiment satisfies the construction requirement, get into the support and examine the acceptance link, according to the data adjustment girder bottom elevation of pre-compaction experiment, girder bottom elevation formula is as follows: h ', H + P, wherein H' is the elevation of the main beam bottom, and H is the elevation of the designed main beam bottom; and P is the elastic deformation value of the temporary pier bracket prepressing.
Hoisting the arch rib (320): and after the support acceptance is finished, hoisting the arch rib (320) to the temporary support (100) for assembly.
10. The method for constructing the main arch and the auxiliary arch of the double-flying-wing arch bridge according to claim 9, wherein in the pre-pressing of the bracket, the pre-pressing load is loaded for 4 times, the pre-pressing load loaded for the first time is 25% of the weight of the arch rib section, the pre-pressing load loaded for the second time is 75% of the weight of the arch rib section, the pre-pressing load loaded for the third time is 100% of the weight of the arch rib section, the pre-pressing load loaded for the fourth time is 110% of the weight of the arch rib section, and the pre-pressing load is maintained for 24 hours each time.
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| CN202010087940.4A CN111172886A (en) | 2020-02-12 | 2020-02-12 | Construction method of main arch and auxiliary arch of double-flying-wing arch bridge and temporary support used by same |
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