CN109252455A - A kind of free cantilever erection construction method of more main truss Steel truss structures - Google Patents
A kind of free cantilever erection construction method of more main truss Steel truss structures Download PDFInfo
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- CN109252455A CN109252455A CN201811187706.8A CN201811187706A CN109252455A CN 109252455 A CN109252455 A CN 109252455A CN 201811187706 A CN201811187706 A CN 201811187706A CN 109252455 A CN109252455 A CN 109252455A
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- internode
- purlin
- floorings
- construction method
- free cantilever
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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
- E01D21/10—Cantilevered erection
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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 kind of free cantilever erection construction methods of more main truss Steel truss structures, are related to technical field of bridge construction, comprising the following steps: are pre-installing N internode floorings between purlin in N internode side purlin and N internode；Set up N+1 internode side purlin；N internode floorings are fixedly connected with purlin in N internode side purlin and N internode；Set up purlin in N+1 internode；Step S1~S4 is repeated, free cantilever erection internode is up to pier and midspan closing on end bay.Construction method of the invention can be effectively controlled the side of more main truss Steel truss structures, middle purlin height difference to a very small extent, guarantee Pavement linear.
Description
Technical field
The present invention relates to technical field of bridge construction, and in particular to a kind of free cantilever erection construction of more main truss Steel truss structures
Method.
Background technique
In order to make full use of valuable bridge location resource, the bridge using combined highway and metro mode is more and more, wherein steel truss girder
Structure is suitable for road, the layering of railway face up and down, is the preferred bridge type for building combined bridge.As the current route of bridge increases
More, design load increase, double deck width have no longer been suitable for often up to 30 meters or more, then using conventional double main truss structures.This
When more main truss structure forms of three main trusses or more can be used, reduce bridge floor horizontal span.More main truss structure systems specifically include that
Side, middle purlin main truss rod piece, upper and lower layer floorings, the components such as node connection system.Connected between main truss rod piece by high-strength bolt
It connecing, floorings are connect with main truss rod piece by bolting and welding, i.e., floorings cantilever diaphragm and main truss use high strength exploitation,
Floorings top plate and main truss are using welding.China is completed and includes that the day the Changjiang river Xing Zhou is big in the more main truss bridges built at present
Bridge, Foundations of Dashengguan Changjiang River Bridge, Shanghai Changjiang River bridge etc., the above bridge is all made of 3 main couples.
The construction method of conventional double main truss structure steel truss girders mainly includes assembled bracket, free cantilever erection and incremental launching construction
Deng wherein free cantilever erection is most commonly seen.In pier top or king-tower column, falsework is set, assembled 0 number section, the symmetrical cantilever in two sides later
Steel girder member bar is installed.Mounting means includes integral installation after the completion of loose mail installation and segment are assembled in advance.Loose mail installation pair
Mechanical requirement is low, is readily transported, installs, and has stronger adaptability.
Three of the above construction method can also be used in more main truss structures.When using free cantilever erection, it is high to be easy to produce side, middle purlin
Difference.According to kingpost cantalever assembling process, floorings are first bolted with main truss, after all floorings are respectively mounted in place, just start to carry out
Floorings formally weld.Before welding, floorings are closer to freely-supported on side, middle purlin, and middle purlin undertakes two width bridge floors of left and right at this time
The weight of each half of plate, side purlin undertake a width floorings half weight.Due to share load difference, can an internode side,
It is poor that middle purlin generates amount of deflection；In addition, erection crane central bearing point is supported on middle purlin, two while point supporting while among purlin, this
Will also result in side, middle purlin is shared loop wheel machine self weight and is had differences, also have a certain impact to side, middle purlin amount of deflection difference is increased.
When free cantilever erection, installed internode the relative rotation formed in, middle purlin height difference can to subsequent installation internode while,
The linear increase of the middle high residual quantity in purlin, so that it be made constantly to accumulate.Side, middle purlin height difference influence structural linetype, keep bridge deck horizontal
To misplacing, increase structure mount stress.
Summary of the invention
For defect present in existing construction technology, the purpose of the present invention is to provide a kind of more main truss Steel truss structures
Free cantilever erection construction method, can be effectively controlled side, middle purlin height difference to a very small extent, guarantee Pavement linear.
To achieve the above objectives, the technical solution adopted by the present invention is that: a kind of free cantilever erection of more main truss structure steel truss girders
Construction method, comprising the following steps:
S1 is pre-installing N internode floorings between purlin in N internode side purlin and N internode；
S2 sets up N+1 internode side purlin；
N internode floorings are fixedly connected by S3 with purlin in N internode side purlin and N internode；
S4 sets up purlin in N+1 internode；
S5 repeats step S1~S4, and free cantilever erection internode is up to pier and midspan closing on end bay；
Wherein, N is positive integer.
Based on the above technical solution, described to pre-install N internode on purlin in N internode side purlin and N internode
Floorings, comprising the following steps:
The cantilever diaphragm of the N internode floorings is connect with purlin in N internode side purlin and N internode using small punch.
Based on the above technical solution, described by purlin in N internode floorings and N internode side purlin and N internode
It is fixedly connected, comprising the following steps:
Purlin in the cantilever diaphragm and N internode side purlin and N internode of the N internode floorings is passed through into high-strength screw
It is fixedly connected, purlin in the top plate and N internode side purlin and N internode of the N internode floorings is welded.
Based on the above technical solution, further comprising the steps of:
There are splicing seams between the N+1 internode and N internode side, the connection of middle purlin；
When the difference in height of side, middle purlin is more than preset value, by purlin in purlin in N+1 internode and N internode in upper chord node
The Distance Shortened X mm for locating splicing seams, by N+1 internode, when purlin is with N internode, purlin is stretched at a distance from splicing seams at the upper chord node
Long Y mm；
Wherein, X, Y are positive number.
Based on the above technical solution, comprising the following steps:
It is spaced M internode, by purlin in N+1+M internode and purlin in N+M internode at the upper chord node at a distance from splicing seams
Extend X mm, the Distance Shortened Y mm of N+1+M internode purlin splicing seams at upper chord node at purlin and N+M internode；
Wherein, M is positive integer.
Based on the above technical solution, further comprising the steps of:
When N+1 internode is the last one internode of end bay, side, middle purlin difference in height when being more than preset value, set up N+1
Purlin in internode；
Set up N+1 internode side purlin；
Successively N internode floorings and N+1 internode floorings are fixed in installation.
Based on the above technical solution, it sets up in N+1 internode after the completion of purlin, to N+1 internode at the top of abutment pier
Middle purlin pad.
Based on the above technical solution, after the completion of setting up N+1 internode side purlin, N+1 is not saved at the top of abutment pier
Between side purlin pad.
Based on the above technical solution, N internode floorings and N+1 internode bridge floor are fixed in the successively installation
Plate, comprising the following steps:
The cantilever diaphragm of N internode floorings and N+1 internode floorings and the purlin side Heng Hezhong are successively passed through into high intensity
Bolt is fixedly connected, and the top plate of N internode floorings and N+1 internode floorings and the purlin side Heng Hezhong are welded.
Compared with the prior art, the advantages of the present invention are as follows:
(1) the free cantilever erection construction method of more main truss Steel truss structures of the invention, first sets up N+1 internode side purlin, so
N internode floorings are fixedly connected with purlin in N internode side purlin and N internode afterwards, then set up purlin in N+1 internode, certainly
Under recast is used, the purlin downwarp of N+1 internode side increases, and offsets side, middle purlin height difference that bridge deck generates, guarantees Pavement linear.
(2) the free cantilever erection construction method of more main truss Steel truss structures of the invention, when the difference in height of side, middle purlin is more than pre-
If when value, by adjusting purlin in internode, when the length of purlin splicing seams at upper chord node improves, middle purlin height difference, guaranteeing bridge floor
It is linear.
(3) the free cantilever erection construction method of more main truss Steel truss structures of the invention, when N+1 internode is the last of end bay
One internode, side, middle purlin difference in height be more than preset value when, to purlin pad in N+1 internode at the top of abutment pier, but not to N+
1 internode side purlin pad, under Gravitative Loads, the downwarp of side purlin increases, and side, middle purlin height difference reduce, and guarantees Pavement linear.
Detailed description of the invention
Fig. 1 is the floor map of the free cantilever erection construction of more main truss Steel truss structures in the embodiment of the present invention；
In figure: the N internode side 1- purlin, the N+1 internode side 2- purlin, purlin in 3- N internode, purlin in 4- N+1 internode, 5-
N internode floorings, 6- N+1 internode floorings.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
Shown in Figure 1, the embodiment of the present invention provides a kind of free cantilever erection construction method of more main truss Steel truss structures, packet
Include following steps:
S1 pre-installs N internode floorings 5 on purlin 2 in N (N is positive integer) internode side purlin 1 and N internode；
S2 sets up N+1 internode side purlin 2；
N internode floorings 5 are fixedly connected by S3 with purlin 3 in N internode side purlin 1 and N internode；
S4 sets up purlin 4 in N+1 internode；
S5 repeats step S1~S4, and free cantilever erection internode is up to pier and midspan closing on end bay.
Compared with prior art, the free cantilever erection construction method of more main truss Steel truss structures of the invention, first sets up N+1
Then N internode floorings 5 are fixedly connected with purlin 3 in N internode side purlin 1 and N internode, then set up N+ by internode side purlin 2
Purlin 4 in 1 internode, when due to setting up N+1 internode side purlin 2, purlin in N internode floorings 5 and N internode side purlin 1 and N internode
3 are not fixedly connected, and corner is unconstrained, and lateral stiffness is weak, and under Gravitative Loads, 2 downwarp of N+1 internode side purlin increases, and offset
Side that bridge deck generates, middle purlin height difference, structure stress do not have added influence, does not need other additional mechanical equipment, control side, in
Purlin height difference guarantees Pavement linear in very a small range.
As preferred embodiment, N internode floorings 5 are pre-installed on purlin 3 in N internode side purlin 1 and N internode
When, the cantilever diaphragm of N internode floorings 5 is connect with purlin 3 in N internode side purlin 1 and N internode using small punch.
As preferred embodiment, by the fixed company in purlin 3 in N internode floorings 5 and N internode side purlin 1 and N internode
When connecing, the cantilever diaphragm of N internode floorings 5 and purlin 3 in N internode side purlin 1 and N internode are fixed by high-strength screw
Connection, the top plate of N internode floorings 5 and purlin 3 in N internode side purlin 1 and N internode are welded, and can guarantee that floorings are pacified
The stability of dress.
As preferred embodiment, there are splicing seams between N+1 internode and N internode side, the connection of middle purlin；When side,
The difference in height of middle purlin be more than preset value when, by purlin 3 in purlin 4 in N+1 internode and N internode at upper chord node splicing seams away from
From X mm (X is positive number) is shortened, by N+1 internode, when purlin 2 is with N internode, purlin 1 is stretched at a distance from splicing seams at the upper chord node
Long Y mm (Y is positive number)；It is spaced M (M is positive integer) a internode, by purlin 3 in purlin 4 in N+1+M internode and N+M internode upper
The distance of splicing seams extends X mm at chord node, and N+1+M internode purlin 1 at purlin 2 and N+M internode is spliced at upper chord node
The Distance Shortened Y mm of seam.By adjusting purlin in internode, when the length of purlin splicing seams at upper chord node improves, middle purlin it is high
Difference guarantees Pavement linear.
As preferred embodiment, when N+1 internode is the last one internode of end bay, side, the difference in height of middle purlin are super
When crossing preset value, purlin 4 in N+1 internode is set up, by 4 pad of purlin in N+1 internode at the top of abutment pier；Set up N+1 internode side
Purlin 2, not to 2 pad of N+1 internode side purlin at the top of abutment pier；Successively N internode floorings 5 and N+1 internode bridge are fixed in installation
Panel 6 specifically passes through the cantilever diaphragm of N internode floorings 5 and N+1 internode floorings 6 and the side purlin Heng Hezhong high-strength
Degree is bolted, and the top plate of N internode floorings 5 and N+1 internode floorings 6 and the purlin side Heng Hezhong are welded.
Due to, to the pad of purlin 4 in N+1 internode, supporting purlin 4 in N+1 internode, but do not save to N+1 at the top of abutment pier
Between 2 pad of side purlin, N+1 internode side purlin 2 vacantly be in free state, under Gravitative Loads, the downwarp of side purlin increase, side, middle purlin
Height difference reduces, and guarantees Pavement linear.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (9)
1. a kind of free cantilever erection construction method of more main truss Steel truss structures, which comprises the following steps:
S1 is pre-installing N internode floorings between purlin in N internode side purlin and N internode；
S2 sets up N+1 internode side purlin；
N internode floorings are fixedly connected by S3 with purlin in N internode side purlin and N internode；
S4 sets up purlin in N+1 internode；
S5 repeats step S1~S4, and free cantilever erection internode is up to pier and midspan closing on end bay；
Wherein, N is positive integer.
2. the free cantilever erection construction method of more main truss Steel truss structures as described in claim 1, which is characterized in that described the
N internode floorings are pre-installed on purlin in N internode side purlin and N internode, comprising the following steps:
The cantilever diaphragm of the N internode floorings is connect with purlin in N internode side purlin and N internode using small punch.
3. the free cantilever erection construction method of more main truss Steel truss structures as described in claim 1, which is characterized in that described by the
N internode floorings are fixedly connected with purlin in N internode side purlin and N internode, comprising the following steps:
The cantilever diaphragm of the N internode floorings is fixed with purlin in N internode side purlin and N internode by high-strength screw
Connection, purlin in the top plate and N internode side purlin and N internode of the N internode floorings is welded.
4. the free cantilever erection construction method of more main truss Steel truss structures as described in claim 1, which is characterized in that further include with
Lower step:
There are splicing seams between the N+1 internode and N internode side purlin, the connection of middle purlin；
When the difference in height of side, middle purlin is more than preset value, purlin in purlin in N+1 internode and N internode is spelled at upper chord node
The Distance Shortened X mm of seam, by N+1 internode, when purlin is with N internode, purlin extends Y at the upper chord node at a distance from splicing seams
mm；
Wherein, X, Y are positive number.
5. the free cantilever erection construction method of more main truss Steel truss structures as claimed in claim 4, which is characterized in that including following
Step:
Be spaced M internode, by purlin in N+1+M internode and purlin in N+M internode at the upper chord node elongation X at a distance from splicing seams
Mm, the Distance Shortened Y mm of N+1+M internode purlin splicing seams at upper chord node at purlin and N+M internode；
Wherein, M is positive integer.
6. the free cantilever erection construction method of more main truss Steel truss structures as described in claim 1, which is characterized in that further include with
Lower step:
When N+1 internode is the last one internode of end bay, side, middle purlin difference in height when being more than preset value, set up N+1 internode
Middle purlin；
Set up N+1 internode side purlin；
Successively N internode floorings and N+1 internode floorings are fixed in installation.
7. the free cantilever erection construction method of more main truss Steel truss structures as claimed in claim 6, it is characterised in that:
It sets up in N+1 internode after the completion of purlin, to purlin pad in N+1 internode at the top of abutment pier.
8. the free cantilever erection construction method of more main truss Steel truss structures as claimed in claim 6, it is characterised in that:
After the completion of setting up N+1 internode side purlin, not to N+1 internode side purlin pad at the top of abutment pier.
9. the free cantilever erection construction method of more main truss Steel truss structures as claimed in claim 6, which is characterized in that it is described successively
N internode floorings and N+1 internode floorings are fixed in installation, comprising the following steps:
The cantilever diaphragm of N internode floorings and N+1 internode floorings and the purlin side Heng Hezhong are successively passed through into high-strength bolt
It is fixedly connected, the top plate of N internode floorings and N+1 internode floorings and the purlin side Heng Hezhong is welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187706.8A CN109252455B (en) | 2018-10-11 | 2018-10-11 | Cantilever assembling construction method of multi-main-truss steel truss girder structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811187706.8A CN109252455B (en) | 2018-10-11 | 2018-10-11 | Cantilever assembling construction method of multi-main-truss steel truss girder structure |
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| CN109252455A true CN109252455A (en) | 2019-01-22 |
| CN109252455B CN109252455B (en) | 2020-05-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113718662A (en) * | 2021-09-18 | 2021-11-30 | 中铁大桥局集团有限公司 | Pushing and sliding method suitable for steel truss girder with complex vertical curve |
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| JPH083923A (en) * | 1994-06-17 | 1996-01-09 | Kawasaki Heavy Ind Ltd | Extension work for composite diagonal tension bridge and stress improvement device |
| CN101509232A (en) * | 2009-03-20 | 2009-08-19 | 中铁大桥局股份有限公司 | Three-joist trussed steel beam linear control method |
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| CN113718662A (en) * | 2021-09-18 | 2021-11-30 | 中铁大桥局集团有限公司 | Pushing and sliding method suitable for steel truss girder with complex vertical curve |
| CN113718662B (en) * | 2021-09-18 | 2023-03-14 | 中铁大桥局集团有限公司 | Pushing and sliding method suitable for steel truss girder with complex vertical curve |
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