CN101353882B - Method for establishing structure of slant legged rigid frame bridge and cantalever pouring construction method - Google Patents
Method for establishing structure of slant legged rigid frame bridge and cantalever pouring construction method Download PDFInfo
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Abstract
The invention discloses a pouring construction method of the structure of a continuous rigid frame bridge with inclined legs and a cantilever, which includes the following steps: firstly, bottom chords (the inclined legs) are arranged; secondly, the proper depth of a root girder is selected and is equal to 1/8 to 1/10 of the main span; thirdly, the proper height of a solid-web girder section is selected, the height of ends thereof is equal to 1/15 to 1/17 of the length of the solid-web girder section, and the mid-span height is equal to 1/50 to 1/70 of the length of the main span; fourthly, the cantilever pouring construction is carried out on sections of top chords and the bottom chords until a stable triangle truss is formed; and fifthly, the cantilever pouring construction is carried out to each section of the solid-web girder section for joining the sections so as to complete the whole bridge construction. A cantilever pouring and construction device comprises a cradle, a top chord template, a bottom chord template, a front hanger rod and a rear hanger rod. The method is simple and has safe and convenient construction, simple structure and stability and reliability, thereby improving the spanning capacity and the engineering economical efficiency of the bridge.
Description
Technical field
The present invention relates to a kind of civil engineering bridge technology field that is used for, more specifically relate to the method for structure of a kind of battered leg (open web type) continuous rigid frame bridge and the method for free cantilever casting construction thereof, under the essentially identical prerequisite of construction requirement, durability characteristics of maintenance and general continuous rigid frame bridge, realized a kind of new bridge pattern that possesses bigger span ability and Geng Jia economy.
Background technology
Bridge is in highway, railway, urban road and country road and the water conservancy construction, in order to cross over the works of various obstacles (as river or other structure).Divide by structure feature, bridge can be divided into beam, arch, rigid frame, hang and combined system.Concrete structure mainly adopts beam, arch, rigid frame system.Prestressed concrete continuous rigid-framed bridge is a kind of basic bridge type of Longspan Bridge, and it possesses following three characteristics: (1) main pier adopts the pier beam consolidation, forms the swing support system thereby main pier possesses certain flexibility; (2) superstructure still has the loading characteristic of continuous beam, and structure section is generally the case beam, the case depth of beam with stride the footpath ratio, root is 1/16～1/18, span centre is 1/30～1/60; (3) superstructure adopts cantilever construction, and the pier beam consolidation saves large-scale bearing.
The Technological Economy of traditional prestressed concrete continuous rigid-framed bridge is suitable for strides the footpath about 60～200m, when striding the footpath above 200m, be prone to defectives such as span centre downwarp, beam body deformability, cracking, had a strong impact on the application life and the durability of bridge, limited the span ability of this bridge type.At present, how domestic and international research person starts with from the material aspect for the span ability that improves continuous rigid frame bridge: the maximum Norway stolma bridge in footpath is striden in the world, main span footpath 301m, and span centre 184m case beam adopts the LC60 light weight concrete construction; China's Chongqing slabstone slope bridge, main span footpath 330m, span centre 103m section adopts steel case beam.Because there are gap in China's material, construction, administrative skill, adopt girder steel to be limited by traffic condition again, the technological progress stagnation of continuous rigid frame bridge.
On the whole, the main deficiency of traditional prestressed concrete continuous rigid-framed bridge is: (1) span ability is little, and stock utilization is lower, when striding the footpath greater than 200m, and impatient acute deterioration of engineering economy; (2) structural bearing efficient is low, when being applied to stride the footpath greater than the 200m bridge, is prone to cracking, downwarp problem, and technical risk increases, the safety of structure and durability deterioration; (3) superstructure weight is big, causes bridge pier, basic stress big, the ability of opposing earthquake.
Summary of the invention
The objective of the invention is to be to provide the method for structure of a kind of battered leg (open web type) continuous rigid frame bridge and the method for free cantilever casting construction thereof, method is simple, and is easy to operate, is connected well with traditional job practices, is convenient to quality control.
To achieve these goals, the present invention adopts following technical measures:
The form of structure of a kind of battered leg (open web type) continuous rigid frame bridge comprises; The root web hollows out, and constitutes battered leg-open web type bridge system and stress characteristic.
1, battered leg-open web type bridge system
If the footpath (distances between the two adjacent bridge piers) of striding of bridge is L, then the length (battered leg horizontal length) of part is desirable on an empty stomach
(1/6～1/5)L
Wherein, stride footpath L and be generally 100～350m.
Stride battered leg (open web type) continuous rigid frame bridge, its structure primary structure such as Fig. 1 for one typical three.Similar with traditional continuous rigid frame, a plurality of main spans that equate or do not wait can be arranged.
The battered leg root is desirable to the back overall height
(1/10～1/8)L
Wherein, stride footpath L and be generally 100～350m.
For convenience of cantilever construction, the angle of battered leg and horizontal plane is controlled at and is not more than 25～30 degree.
2, stress characteristic
The stress characteristic of battered leg (open web type) continuous rigid frame bridge is:
1) hollows out by web, strengthen the root overall height, improve the rigidity of structure of root interval;
2) form root English truss zone, it is stressed into stretch bending to wind up, and the lower edge battered leg is stressed for bending, and has improved the structure load-carrying efficiency;
3) by rationally determining the upper and lower flat-sawn face and the depth of truss in English truss district, make the real abdomen formula of span centre section and traditional cantilever construction continuous rigid frame bridge of quite striding the footpath of deducting the truss section length stressed quite;
4) before construction closure section, upper and lower string truss, real abdomen formula section constitute the T body system of a balance under the deadweight effect with pier stud.
The enforcement of the form of structure of a kind of battered leg (open web type) continuous rigid frame bridge comprises:
1, rationally determines the length of lower edge (battered leg)
The force request of the force request when lower edge (battered leg) length will be according to the lower edge cantilever construction, Cheng Qiaohou lower edge compressive stress, the real abdomen formula of span centre section is taken all factors into consideration, be optimized according to mechanical calculation, generally get and stride 1/6～1/5 of footpath L (distances between the two adjacent bridge piers).
2, rationally determine high and each the section deck-molding in root purlin
Lower edge (battered leg) root is to the height of back---be root purlin height, generally get and stride 1/10～1/8 of footpath L (distances between the two adjacent bridge piers) that for convenience of the lower edge cantilever construction, the inclination angle of lower edge is not more than 25～30 degree.
1/15～1/17 of the desirable real abdomen formula section length of maximum deck-molding of real abdomen formula section, span centre deck-molding are got and are striden 1/50～1/70 of footpath L (distances between the two adjacent bridge piers).
3, sections is divided
According to the ability of free cantilever casting Hanging Basket, template, divide sections.Sections weight balanced, the cantilever left and right sides that sections is wanted should equate, balance.
4, the program by the sections cantilever construction checks
Construction sequence according to design, check by sections, until the checking computations of each loading operating mode of Cheng Qiaohou, mechanical calculation can adopt finite element theory and software (as Midas, TDV, Ansys, bridge doctor, GQJS etc.) to carry out with checking computations, and disposes corresponding prestressed strand (muscle).All designs all should be satisfied corresponding bridge design, job specfication with checking computations.
The form of structure of a kind of battered leg (open web type) continuous rigid frame bridge comprises: binder, lower edge (battered leg) between basis, cushion cap, pier stud, pier, wind up, real abdomen formula beam section, span centre closure section, end bay closure section, abutment pier beam section, pier back timber section.
Its annexation is: basis instrument is in the suitable ground layer of the following engineering geology in the face of land, cushion cap is positioned on the basis basic top is connected into integral body, pier stud is arranged on the cushion cap, establish pier back timber section at the pier stud top, at pier stud and lower edge intersection location binder between pier is set, lower edge, wind up and pier stud constitutes triangular truss, lower edge, wind up concourse and real abdomen formula beam section are joined, by the real abdomen formula beam section of the adjacent pier cantilever construction of span centre closure section connection, connect the real abdomen formula beam section and the abutment pier beam section of cantilever construction by end bay closure section.
The method of the cantilever construction of a kind of battered leg (open web type) continuous rigid frame bridge construction comprises: balance is divided sections, is pursued sections free cantilever casting construction method, the interim knotted rope of stretch-draw lower edge.
1, balance is divided sections
With wind up, lower edge truss, real abdomen formula section be by the principle with respect to the pier stud symmetry, be divided into can step pouring sections, sections weight is divided by Hanging Basket, template ability.
2, by sections free cantilever casting construction method
From the pier stud root, the upper and lower chord joint section of two ends, the left and right sides sections of constructing simultaneously by sections dead weight balance or apply additional balance weight, makes structure keep balance, merges until upper and lower string to form triangular truss; Pour into a mould real abdomen formula sections and finish until whole T body system, construct at last span centre closure section and end bay closure section between the adjacent T body system, thus finish the construction of whole beam body.
Before upper and lower string English truss system formed, lower edge often can't bear own wt, can improve lower edge stressed in work progress by the interim knotted rope of stretch-draw.
The free cantilever casting job practices of a kind of battered leg (open web type) continuous rigid frame bridge comprises: Hanging Basket, the template of winding up, lower edge template, preceding suspension rod, rear suspension bar, the sections that winds up, lower edge sections, interim knotted rope.
Its annexation is: the Hanging Basket anchoring is suspended on the leading portion beam section (winding up and real abdomen formula beam) of having constructed and goes up and can advance piecemeal, the template of winding up by preceding suspension rod be suspended on the Hanging Basket front beam, by the rear suspension bar anchor in the beam section of constructing, the lower edge template by preceding suspension rod be suspended on the Hanging Basket front beam, by the rear suspension bar anchor in the lower edge beam section of constructing, on the template of winding up, pour into a mould the sections concrete that winds up, pour down the chord joint section concrete at lower edge template top-pour, interim knotted rope connects lower edge and pier stud top.
The present invention has the following advantages and effect: 1) under the prerequisite that keeps traditional material (C50～C60 concrete), traditional construction technology (free cantilever casting construction technology), improve the continuous rigid frame bridge span and get over ability 40～60%, make the technology of free cantilever casting construction continuous rigid frame bridge, the economic and practical footpath of striding reach 300～350m; 2) improve structural bearing efficient, in striding footpath 200～300m scope, traditional relatively real abdomen formula structure has better engineering economy.
Description of drawings
Fig. 1 is a kind of structural representation of battered leg continuous rigid frame bridge;
Fig. 2 cooperates schematic diagram for Fig. 1, illustrates to wind up and the sectional schematic diagram of lower edge (battered leg);
Fig. 3 is that the balanced cantilever construction sections of a kind of battered leg (open web type) continuous rigid frame bridge is divided schematic diagram;
Fig. 4 cooperates schematic diagram for Fig. 3;
Fig. 5 is the balanced cantilever casting and constructing schematic diagram of a kind of battered leg (open web type) continuous rigid frame bridge;
Fig. 6 cooperates schematic diagram for Fig. 5;
Wherein: the 1-face of land, 2A, the 2B-basis, 3A, the 3B-cushion cap, 4A, the 4B-pier stud, 5A, binder between the 5B-pier, 6A1,6A2,6B1,6B2-lower edge (battered leg), 7A1,7A2,7B1,7B2-winds up, 8A1,8A2,8B1, the real abdomen formula of 8B2-beam section, 9-span centre closure section, 10A, the 10B-end bay closure section, 11A, 11B-abutment pier beam section, 12A1,12A2,12B1, the real abdomen formula of 12B2-girder segment, 13A1,13A2,13B1,13B2-lower edge sections, 14A1,14A2,14B1, the 14B2-sections that winds up, the 15-Hanging Basket, 16-winds up or real abdomen formula girder segment template, 17-lower edge template, suspension rod before the 18-, 19-rear suspension bar, 20A, 20B-pier back timber section, the interim knotted rope of 21-.
The specific embodiment
The enforcement of the form of structure of a kind of battered leg (open web type) continuous rigid frame bridge comprises:
5, rationally determine the length of lower edge (battered leg) 6A1,6A2,6B1,6B2
The force request of the force request when lower edge (battered leg) 6A1,6A2,6B1,6B2 length will be according to the lower edge cantilever constructions, Cheng Qiaohou lower edge compressive stress, the real abdomen formula of span centre section is taken all factors into consideration, be optimized according to mechanical calculation, generally get and stride 1/6～1/5 of footpath L (distances between the two adjacent bridge piers).
6, rationally determine high and each the section deck-molding in root purlin
Lower edge (battered leg) 6A1,6A2,6B1,6B2 root are to height---the root purlin height of back, generally get and stride 1/10～1/8 of footpath L (distances between the two adjacent bridge piers), in order to make lower edge 6A1,6A2,6B1,6B2 make things convenient for cantilever construction, the inclination angle of lower edge 6A1,6A2,6B1,6B2 is not more than 25～30 degree.
1/15～1/17 of the desirable real abdomen formula section length of maximum deck-molding of real abdomen formula beam section 8A1,8A2,8B1,8B2, the span centre deck-molding is got and is striden 1/50～1/70 of footpath L (distances between the two adjacent bridge piers).
7, sections is divided
According to the ability of free cantilever casting Hanging Basket, template, divide sections.Sections weight balanced, the cantilever left and right sides that sections is wanted should equate, balance.
8, the program by the sections cantilever construction checks
Construction sequence according to design, check by sections, checking computations until each loading operating mode of Cheng Qiaohou, mechanical calculation can adopt finite element theory and commercially available software (as Midas, TDV, Ansys, bridge doctor, GQJS etc.) to carry out with checking computations, and disposes corresponding prestressed strand (muscle).All designs all should be satisfied corresponding bridge design, job specfication with checking computations.
The enforcement of the free cantilever casting job practices of a kind of battered leg (open web type) continuous rigid frame bridge comprises:
A. construction basis (2A, 2B), cushion cap (3A, 3B), pier stud (4A, 4B);
B. set up the pier ceiling hold, binder (5A, 5B) and pier back timber section (20A, 20B) between the cast pier;
C. the construction of each pier cantilever T
A) every pier is installed a pair of Hanging Basket (15);
B) lower edge template (17) is installed, cast lower edge sections (13A1,13A2) concrete;
C) treat that lower edge sections (13A1,13A2) concrete reaches the 7 day length of time, or concrete grade reaches 80%～100%, stretch-draw prestressing force steel bundle;
D) template (16) of winding up is installed, pours into a mould sections (14A1, the 14A2) concrete that winds up;
E) sections to be winded up (14A1,14A2) concrete reaches the 7 day length of time, or concrete grade reaches 80%～100%, stretch-draw prestressing force steel bundle;
F) two ends, left and right sides Hanging Basket (15) moves forward to completed beam-ends;
G) repeat b)～f), and until finishing upper and lower string bracketed part casting and constructing, according to the stressed needs of lower edge, the interim knotted rope of stretch-draw (21);
H) remove lower edge template (17);
I) two ends, left and right sides Hanging Basket moves forward to completed beam-ends;
J) template (16) of winding up is installed, cast closure section: first section of real abdomen formula girder segment (12A1,12A2);
K) section concrete to be joined the two sections of a bridge, etc reaches the 7 day length of time, or concrete grade reaches 80%～100%, and stretch-draw prestressing force steel bundle is removed interim knotted rope (21), thereby finishes the free cantilever casting construction of English truss part;
L) two ends, left and right sides Hanging Basket moves forward to completed beam-ends;
M) template (16) of winding up is installed, pours into a mould real abdomen formula girder segment (12A1,12A2) concrete;
N) treat that real abdomen formula girder segment (12A1,12A2) concrete reaches the 7 day length of time, or concrete grade reaches 80%～100%, stretch-draw prestressing force steel bundle;
O) repeat l)～n), finish real abdomen formula girder segment (12A1,12A2) cantilever construction, finish the construction of cantilever T;
D., abutment pier beam section cast support is installed, cast abutment pier beam section (11A, 11B);
E., end bay closure section suspension bracket or support are installed, cast end bay closure section (10A, 10B), stretch-draw end bay closure prestressed strand;
F., span centre closure section suspension bracket is installed, closure section (9) in the casting bay, stretch-draw span centre closure prestressed strand;
G. finish bridge deck, other parts construction, finish bridge construction.
Claims (3)
1. the method for the free cantilever casting of battered leg continuous rigid frame bridge construction, it comprises the following steps:
A. determine the length of lower edge or battered leg:
Stressed, Cheng Qiaohou lower edge compressive stress during according to the lower edge cantilever construction of lower edge or battered leg length, the force request of the real abdomen formula of span centre section are taken all factors into consideration, and carry out according to mechanical calculation, get and stride footpath L: 1/6～1/5 of the distance between the two adjacent bridge piers;
B. determine high and each the section deck-molding in root purlin:
Lower edge or battered leg root be to the height of back, i.e. root purlin height is got and striden footpath L: 1/10～1/8 of the distance between the two adjacent bridge piers, and in order to make lower edge make things convenient for the free cantilever casting construction, the inclination angle of lower edge is not more than 25～30 degree;
The deck-molding of real abdomen formula section is got 1/15～1/17 of real abdomen formula section length, and the span centre deck-molding is got and striden footpath L: 1/50～1/70 of the distance between the two adjacent bridge piers;
C. sections is divided:
According to the ability of free cantilever casting Hanging Basket, template, divide sections; Sections weight balanced, the cantilever left and right sides that sections is wanted should equate, balance;
D. the program by the sections cantilever construction checks:
Construction sequence according to design, check by sections, until the checking computations of each loading operating mode of Cheng Qiaohou, mechanical calculation adopts finite element theory and software to carry out with checking computations, and dispose corresponding prestressed strand, all designs all should be satisfied corresponding bridge design, job specfication with checking computations.
2. the method for the free cantilever casting construction of battered leg continuous rigid frame bridge according to claim 1, comprising: the face of land (1), basis (2A, 2B), cushion cap (3A, 3B), pier stud (4A, 4B), binder (5A between pier, 5B), lower edge (6A1,6A2,6B1,6B2), (7A1 winds up, 7A2,7B1,7B2), real abdomen formula beam section (8A1,8A2,8B1,8B2), span centre closure section (9), end bay closure section (10A, 10B), abutment pier beam section (11A, 11B), pier back timber section (20), it is characterized in that: basis (2A, 2B) be arranged in the ground layer of the following engineering geology in the face of land, cushion cap (3A, 3B) be positioned at basis (2A, 2B) with basis (2A, 2B) top connects into integral body, pier stud (4A, 4B) be arranged on cushion cap (3A, 3B), at pier stud (4A, 4B) pier back timber section (20) is established at the top, at pier stud (4A, 4B) with lower edge (6A1,6A2,6B1,6B2) intersection location is provided with binder (5A between pier, 5B), lower edge (6A1,6A2,6B1,6B2), (7A1 winds up, 7A2,7B1,7B2) with pier stud (4A, 4B) constitute triangular truss, lower edge (6A1,6A2,6B1,6B2), (7A1 winds up, 7A2,7B1,7B2) concourse and real abdomen formula beam section (8A1,8A2,8B1,8B2) join, the real abdomen formula beam section (8A1 that connects adjacent pier cantilever construction by span centre closure section (9), 8A2,8B1,8B2), by end bay closure section (10A, 10B) the real abdomen formula beam section (8A1 of connection cantilever construction, 8A2,8B1,8B2) with abutment pier beam section (11A, 11B), lower edge (6A1,6A2,6B1,6B2) inclination angle is less than 25～30 degree.
3. the method for the method of a free cantilever casting construction that realizes the described battered leg continuous rigid frame of claim 1 bridge, it comprises the following steps:
A. construction basis (2A, 2B), cushion cap (3A, 3B), pier stud (4A, 4B);
B. set up the pier ceiling hold, binder (5A, 5B) and pier back timber section (20A, 20B) between the cast pier;
C. the construction of each pier cantilever T:
A) every pier is installed a pair of Hanging Basket (15);
B) lower edge template (17) is installed, cast lower edge sections (13A1,13A2) concrete;
C) treat that lower edge sections (13A1,13A2) concrete reaches the 7 day length of time, or concrete grade reaches 80%～100%, stretch-draw prestressing force steel bundle;
D) template (16) of winding up is installed, pours into a mould sections (14A1, the 14A2) concrete that winds up;
E) sections to be winded up (14A1,14A2) concrete reaches the 7 day length of time, or concrete grade reaches 80%～100%, stretch-draw prestressing force steel bundle;
F) two ends, left and right sides Hanging Basket (15) moves forward to completed beam-ends;
G) repeat b)～f), and until finishing upper and lower string bracketed part casting and constructing, according to the stressed needs of lower edge, the interim knotted rope of stretch-draw (21);
H) remove lower edge template (17);
I) two ends, left and right sides Hanging Basket moves forward to completed beam-ends;
J) template (16) of winding up is installed, cast closure section: first section of real abdomen formula girder segment (12A1,12A2);
K) section concrete to be joined the two sections of a bridge, etc reaches the 7 day length of time, or concrete grade reaches 80%～100%, and stretch-draw prestressing force steel bundle is removed interim knotted rope (21), thereby finishes the free cantilever casting construction of English truss part;
L) two ends, left and right sides Hanging Basket moves forward to completed beam-ends;
M) template (16) of winding up is installed, pours into a mould real abdomen formula girder segment (12A1,12A2) concrete;
N) treat that real abdomen formula girder segment (12A1,12A2) concrete reaches the 7 day length of time, or concrete grade reaches 80%～100%, stretch-draw prestressing force steel bundle;
O) repeat l)～n), finish real abdomen formula girder segment (12A1,12A2) cantilever construction, finish the construction of cantilever T;
D., abutment pier beam section cast support is installed, cast abutment pier beam section (11A, 11B);
E., end bay closure section suspension bracket or support are installed, cast end bay closure section (10A, 10B), stretch-draw end bay closure prestressed strand;
F., span centre closure section suspension bracket is installed, closure section (9) in the casting bay, stretch-draw span centre closure prestressed strand;
G. finish bridge deck, other parts construction, finish bridge construction.
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