CN112195781A - Method for prefabricating section precast bridge by combining long and short line method with bidirectional matching method - Google Patents
Method for prefabricating section precast bridge by combining long and short line method with bidirectional matching method Download PDFInfo
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- CN112195781A CN112195781A CN202010940718.4A CN202010940718A CN112195781A CN 112195781 A CN112195781 A CN 112195781A CN 202010940718 A CN202010940718 A CN 202010940718A CN 112195781 A CN112195781 A CN 112195781A
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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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Abstract
The invention discloses a method for prefabricating a bridge section by combining a long line method and a short line method, which combines a bidirectional matching prefabrication method, and comprises the steps of firstly allocating box girder sections required to be prefabricated by the long line method and the short line method in the same prefabrication sequence according to a bridge type, reserving a matching box girder section for combining, matching and pouring the long line and the short line at the middle position of the prefabrication sequence, prefabricating the long line method and the short line method from two ends of the prefabrication sequence to the middle direction, comparing the line shape of the sections prefabricated by the long line method and the line shape of the sections prefabricated by the short line method with a designed line shape in each direction of a space coordinate axis to obtain the amount of deviation rectification required after the prefabrication of the long line method and the short line method is completed, and placing measuring point coordinates of the two sections used for matching under the same coordinate system through a professional line shape. The construction method is short in construction time, small in occupied space of construction and suitable for matching prefabricated sections by various bridge linear long and short line combination methods.
Description
Technical Field
The invention relates to the technical field of construction of segmental precast bridges, in particular to a method for prefabricating a segmental precast bridge by combining a long and short line method with bidirectional matching.
Background
The existing prefabricating method for the segmental prefabricated bridge comprises a long-line prefabricating method and a short-line prefabricating method.
The long-line prefabrication method is characterized in that the bottom moulds of the segments in the same prefabrication sequence are manufactured at one time, then the segments are prefabricated at intervals, the segments do not need to be lifted off the pedestal in time, and the production speed is high. The method has obvious defects that templates of the same prefabricated sequence need to be made at one time, so that the method occupies larger space during construction, has high requirement on the field, consumes more templates, has low linear precision of prefabricated segments of curve segments, and is not suitable for various changing curve linear shapes.
The short-line prefabrication method only needs to prefabricate the first segment by a set of templates, and the next segment can be poured by taking the prefabricated segment as a template. The method has the advantages of less template consumption, less occupied space during construction and high controllability of the segment line shape by the short-line prefabrication. But each section has large workload of measurement and adjustment before production, and has high requirements on the rigidity and flexibility of the template.
The existing long-line prefabrication method and the existing short-line prefabrication method have respective advantages and disadvantages, and for the short-line prefabrication method with strong adaptability, once a prefabrication sequence starts prefabrication, before the prefabrication sequence is completed, if an erection construction plan is changed and a segment which is not prefabricated in the same prefabrication sequence needs to be preferentially erected, the prefabricated segment of the short-line method is applied to the long-line method for subsequent prefabrication, so that the prefabrication period of the sequence can be shortened. .
The traditional long and short line method can also adopt cast-in-place construction at the middle connecting section, but has larger environmental pollution, longer on-site construction time and poorer concrete quality than prefabrication.
The patent of publication number CN110029580A discloses a construction method of a long and short line combined matching prefabricated section assembled bridge deck, the short line method of the patent can only prefabricate one section, and the long and short line method can not be carried out simultaneously, and the patent does not have a bidirectional matching pouring process.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a construction method for matching prefabricated sections by long and short line connection method, which has the advantages of controllable prefabricated line shape, short construction time and less occupied construction space and is suitable for various bridge line shapes.
In order to achieve the purpose, the invention adopts the following technical scheme.
A method for prefabricating a segmental precast bridge by combining a long and short line method with bidirectional matching is characterized by comprising the following steps of:
s1, distributing box girder segments C1 required by a long-line method and box girder segments D2-Dn required by a short-line method in the same prefabrication sequence according to bridge types, and reserving a box girder segment D1 for long-line and short-line combined matched pouring at the middle position of the prefabrication sequence;
s2, respectively prefabricating a long-line method pedestal and a short-line method pedestal from two ends of the prefabricating sequence to the middle direction;
s3, when prefabricated to box girder segment D1, placing the last box girder segment D2 of the stub method and the box girder segment C1 of the long line method on the same stub method pedestal;
s4, obtaining a prefabricated line shape of the box girder segment D2 according to the overall design line shape of the bridge and the segment line shape of which the long line method is finished, and obtaining a prefabricated line shape of the box girder segment C1 according to the overall design line shape of the bridge and the segment line shape of which the short line method is finished;
s5, placing the prefabricated line shape of the box girder segment D2 and the prefabricated line shape of the box girder segment C1 in the step S4 in the same prefabricated coordinate system, and calculating to obtain theoretical matching coordinates of the box girder segment D2 and the box girder segment C1 for matching the box girder segment D1;
s6, matching and positioning the box girder segment D2 and the box girder segment C1 in the step S3 according to the theoretical matching coordinates of the box girder segment D2 and the box girder segment C1 obtained in the step S5;
and S7, the box girder segment D2 and the box girder segment C1 are used as matching surfaces on two sides of the box girder segment D1, and the box girder segment D1 is poured.
In step S1, a plurality of box girder segments C1 may be prefabricated simultaneously by the long line method, and a box girder segment C2 is matched and cast between two adjacent box girder segments C1. And step S3, removing the fixed end die and adding a bottom die trolley traveling track. The construction method can be used for the construction of a linear bridge or a curved bridge.
Compared with the prior art, the invention has the beneficial effects that: the long and short line combined prefabrication method has the advantages of the long line prefabrication method and the short line prefabrication method, and can avoid respective limitations. The construction method has the following advantages: 1. the prefabrication precision is controllable; 2. the prefabrication efficiency is relatively high; 3. the method is suitable for prefabricating the curve linear segment; 4. the construction occupied space is relatively small; 5. improving the prefabrication efficiency of the prefabrication sequence; 6. the prefabrication production plan can be flexibly adjusted according to the bridge erection construction plan.
Drawings
Fig. 1 is a schematic view of a linear bridge segment prefabrication sequence.
FIG. 2 is a schematic diagram of the long and short line method combined prefabrication of a straight bridge.
Figure 3 is a schematic representation of a curved bridge segment prefabrication sequence.
FIG. 4 is a schematic diagram of a curved bridge fabricated by a long and short line method.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, which illustrates a prefabricated sequence of straight bridge segments, the embodiment is illustrated by taking 10 prefabricated segments as an example, and the prefabricated segments are labeled as segments #1- #10 from left to right.
And S1, distributing the box girder segment C1 required by a long-line method and the box girder segments D2-Dn required by a short-line method in the same prefabrication sequence according to the bridge type, and reserving a box girder segment D1 for long-line and short-line combined matched pouring at the middle position of the prefabrication sequence.
In this embodiment, the 10 prefabricated segments are prefabricated and distributed by a long and short line method as shown in fig. 2, 3 box girder segments C1 can be prefabricated simultaneously by a long line method, and a box girder segment C2 is matched and poured between two adjacent box girder segments C1, and the segments are marked as #1 to # 5; the box girder segments D2-D5 required for the short line method are marked as #7- # 10; box girder segment D1 for long and short line bond mating casting, segment # 6.
Step S2, performing prefabrication on the long-line method pedestal and the short-line method pedestal from two ends of the prefabrication sequence to the middle direction respectively; the long and short line method can be used for simultaneous construction and can also be used for prefabricating construction according to actual conditions.
At step S3, when prefabricated to box girder segment D1, i.e., #6 segment, the last box girder segment D2 (# 7) of the stub method and box girder segment C1 (# 5) of the long line method are placed on the same stub method pedestal. In the step, a short-line method template can be reformed, a fixed end template is removed, and a bottom template trolley travelling track is additionally arranged according to the lengths of segments # 5, #6 and # 7.
And S4, obtaining the prefabricated line shape of the box girder segment D2 according to the integral design line shape of the bridge and the segment line shape of which the long line method is finished, and obtaining the prefabricated line shape of the box girder segment C1 according to the integral design line shape of the bridge and the segment line shape of which the short line method is finished. The matched casting of the box girder segment D1 is performed on the premise that two segments (# 5 and #7 segments) for matching the D1 are prefabricated.
Step S5, the precast line shape of box girder segment D2 (# 7 segment) and the precast line shape of box girder segment C1 (# 5 segment) in step S4 are placed in the same precast coordinate system, and theoretical matching coordinates of box girder segment D2 and box girder segment C1 for matching box girder segment D1 are calculated. When the box girder segment D1 (# 6 segment) is cast, the matching surfaces of the box girder segment C1 (# 5 segment) and the box girder segment D2 (# 7 segment) limit the line shapes of both end surfaces of the box girder segment D1 (# 6 segment), and the line shapes of both sides of the box girder segment D1 (# 6 segment) are limited by matching the overall design line shape of the bridge. Therefore, the line shape of the segment prefabricated by the long line method and the line shape of the segment prefabricated by the short line method are compared with the designed line shape in all directions of the space coordinate axis, the deviation correction amount required after the prefabrication by the long line method and the short line method is obtained, and the coordinates of the measuring points for matching the two segments (# 5 and #7 segments) of D1 are placed under the same coordinate system through a professional line shape control technology for matching pouring.
And S6, matching and positioning the box girder segment D2 and the box girder segment C1 in the step S3 according to the theoretical matching coordinates of the box girder segment D2 and the box girder segment C1 obtained in the step S5. Specifically, the two end molds which are cast by using the long-line method butt joint section (# 5 section) and the short-line method butt joint section (# 7 section) as long and short line combination sections are used for matching and positioning the box girder section C1 (# 5 section) and the box girder section D2 (# 7 section) through a three-way jack on a bottom mold trolley according to the theoretical matching coordinates obtained in the step S6.
And S7, the box girder segment D2 and the box girder segment C1 are used as matching surfaces on two sides of the box girder segment D1, and the box girder segment D1 is poured.
It should be noted that, as shown in fig. 3 and 4, the construction method can be used for the construction of curved bridges. The long and short line method of the curved bridge is combined with the bidirectional matching prefabrication method to form the same straight bridge, so the details are not repeated.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.
Claims (4)
1. A method for prefabricating a segmental precast bridge by combining a long and short line method with bidirectional matching is characterized by comprising the following steps of:
s1, distributing box girder segments C1 required by a long-line method and box girder segments D2-Dn required by a short-line method in the same prefabrication sequence according to bridge types, and reserving a box girder segment D1 for long-line and short-line combined matched pouring at the middle position of the prefabrication sequence;
s2, respectively prefabricating a long-line method pedestal and a short-line method pedestal from two ends of the prefabricating sequence to the middle direction;
s3, when prefabricated to box girder segment D1, placing the last box girder segment D2 of the stub method and the box girder segment C1 of the long line method on the same stub method pedestal;
s4, obtaining a prefabricated line shape of the box girder segment D2 according to the overall design line shape of the bridge and the segment line shape of which the long line method is finished, and obtaining a prefabricated line shape of the box girder segment C1 according to the overall design line shape of the bridge and the segment line shape of which the short line method is finished;
s5, placing the prefabricated line shape of the box girder segment D2 and the prefabricated line shape of the box girder segment C1 in the step S4 in the same prefabricated coordinate system, and calculating to obtain theoretical matching coordinates of the box girder segment D2 and the box girder segment C1 for matching the box girder segment D1;
s6, matching and positioning the box girder segment D2 and the box girder segment C1 in the step S3 according to the theoretical matching coordinates of the box girder segment D2 and the box girder segment C1 obtained in the step S5;
and S7, the box girder segment D2 and the box girder segment C1 are used as matching surfaces on two sides of the box girder segment D1, and the box girder segment D1 is poured.
2. The method for prefabricating a bridge according to claim 1, wherein the longline method is used for prefabricating a plurality of box girder segments C1 at the same time, and the box girder segments C2 are matchedly poured between two adjacent box girder segments C1 in step S1.
3. The method for prefabricating the bridge according to the claim 1, wherein the construction method can be used for constructing a linear bridge or a curved bridge.
4. The method for prefabricating the segmental precast bridge according to the long and short line method combined with the bidirectional matching according to claim 1, wherein in the step S3, the fixed end mould is removed, and a bottom mould trolley travelling track is additionally arranged.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112942141A (en) * | 2021-04-06 | 2021-06-11 | 中铁大桥局第九工程有限公司 | Segment beam matching prefabrication method |
| CN113771212A (en) * | 2021-09-15 | 2021-12-10 | 中铁广州工程局集团有限公司 | Bridge section beam production line, prefabrication system and production method |
| CN114603683A (en) * | 2022-01-14 | 2022-06-10 | 中交第二航务工程局有限公司 | Method for quickly prefabricating concrete segment box girder |
| CN115070925A (en) * | 2022-07-25 | 2022-09-20 | 中铁三局集团有限公司 | Long and short line combined prefabrication method for segment assembled continuous beam |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942141A (en) * | 2021-04-06 | 2021-06-11 | 中铁大桥局第九工程有限公司 | Segment beam matching prefabrication method |
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| CN115070925B (en) * | 2022-07-25 | 2022-12-27 | 中铁三局集团有限公司 | Long and short line combined prefabrication method for segment assembled continuous beam |
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