CN115070242B - Manufacturing method of steel box girder with embedded chord - Google Patents
Manufacturing method of steel box girder with embedded chord Download PDFInfo
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- CN115070242B CN115070242B CN202210700524.6A CN202210700524A CN115070242B CN 115070242 B CN115070242 B CN 115070242B CN 202210700524 A CN202210700524 A CN 202210700524A CN 115070242 B CN115070242 B CN 115070242B
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- edge
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000003466 welding Methods 0.000 claims abstract description 109
- 238000000034 method Methods 0.000 claims abstract description 30
- 238000005192 partition Methods 0.000 claims abstract description 29
- 238000005452 bending Methods 0.000 claims description 19
- 230000035515 penetration Effects 0.000 claims description 6
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
- B23K31/022—Making profiled bars with soldered or welded seams
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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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
Abstract
The manufacturing method of the steel box girder with the embedded chord comprises the following steps: taking a vertical datum line of the middle measuring tower as a reference, and positioning the three middle bottom plate units on the jig frame after the three middle bottom plate units are integrated; after the middle partition plate unit is positioned on the middle bottom plate unit, chord members are respectively positioned at two sides of the middle partition plate unit by taking a vertical datum line of the side measuring tower as a datum; positioning a side bottom plate unit, a side baffle plate unit and a side top plate unit on the outer side of the chord member respectively in sequence by taking a side measuring tower vertical datum line as a reference; positioning the edge web plate unit on the outer sides of the edge bottom plate unit, the edge partition plate unit and the edge top plate unit by taking the vertical datum line of the edge web plate block as a reference; and positioning the middle top plate unit at the top end of the middle partition plate unit by taking the vertical datum line of the middle measuring tower as a reference. The invention adopts reasonable assembly sequence and process flow, solves the manufacturing problem of the embedded chord steel box girder, controls welding deformation and ensures the precision requirement.
Description
Technical Field
The invention belongs to the technical field of fixed building box girders, and particularly relates to a manufacturing method of a steel box girder with embedded chords.
Background
In recent years, steel bridges in the form of truss structures have been more and more popular because of novel design and attractive appearance. The conventional steel box girder structure shown in fig. 1 is composed of a middle bottom plate unit 1, a middle partition plate unit 2, a middle top plate unit 3, a side bottom plate unit 5, a side partition plate unit 6, a side top plate unit 7 and a side web plate unit 8. It can be seen that the existing steel box girder is integrally composed of various plate units, and embedded chords are not contained between the plate units. The steel box girder with the embedded chord members is shown in fig. 2 and consists of a middle bottom plate unit 1, a middle partition plate unit 2, a middle top plate unit 3, chords 4, a side bottom plate unit 5, a side partition plate unit 6, a side top plate unit 7 and a side web plate unit 8. The embedded chord member 4 is used as a part of the integral steel box girder, and the embedded chord member 4 is embedded in the steel box girder and forms the integral steel box girder together with various plate units of the steel box girder due to a certain inclination angle. How to control the precision of the internal inclination angle of the embedded chord member 4 is a difficult point of control for the steel box girder with the structural form; at the same time, how to control the welding deformation caused by the existence of the embedded chord member 4 and the welding quality of the whole steel box girder is a problem to be solved. In this regard, the following technical solutions are now proposed.
Disclosure of Invention
The invention solves the technical problems that: the manufacturing method of the steel box girder of the embedded chord member adopts reasonable assembly sequence and process flow, solves the manufacturing difficulty of the steel box girder of the embedded chord member, controls welding deformation and ensures the precision requirement.
The invention adopts the technical scheme that: the manufacturing method of the steel box girder with the embedded chord comprises the following steps:
s1, positioning three middle bottom plate units on a jig frame after the three middle bottom plate units are integrated by taking a vertical datum line of a middle measuring tower as a reference;
s2, after the middle partition plate unit is positioned on the middle bottom plate unit, positioning chords on two sides of the middle partition plate unit respectively by taking a vertical datum line of the side measuring tower as a datum;
s3, respectively positioning a side bottom plate unit, a side baffle plate unit and a side top plate unit on the outer side of the chord member by taking a side measuring tower vertical datum line as a reference;
s4, positioning the edge web plate unit on the outer side of the edge bottom plate unit, the edge partition plate unit and the edge top plate unit by taking the vertical datum line of the edge web plate block as a reference;
s5, positioning the middle top plate unit at the top end of the middle partition plate unit by taking the middle measuring tower vertical datum line as a reference.
In the above technical solution, further: the method comprises the following welding steps:
A. welding butt welds of the middle floor units and the side floor units;
B. welding butt welds of the chord stringer bottom plate and the middle bottom plate unit and the side bottom plate units;
C. welding fillet welds of the middle partition plate unit and the middle bottom plate unit; welding fillet welds of the side baffle plate unit and the side bottom plate unit;
D. welding edge web plate units and edge bottom plate unit groove fillet welds and fillet welds;
E. welding butt welding seams between the edge web plate units and the edge bottom plate units;
F. welding butt welding seams of the edge web plate unit and the edge partition plate unit;
G. welding fillet welds of the chord member lower chord longitudinal beam, the side baffle plate unit and the middle baffle plate unit;
H. welding butt welding seams or penetration fillet welds of wing plates of the edge web plate unit and the edge baffle plate unit;
I. welding fillet welds of the side baffle plate unit wing plates and the chord member lower chord longitudinal beams;
J. welding an upper butt weld of the edge web plate unit and the edge top plate unit;
K. welding butt welding seams of the side roof units and the chord longitudinal beam roof;
l, welding the lower butt welding seam of the side web plate unit and the side top plate unit;
m, welding a fillet weld or a penetration fillet weld of the side top plate unit and the side partition plate unit;
n, welding fillet welds of the side roof units and the chord lower chord longitudinal beam side joint plates;
o, butt welding seams of the middle top plate units are welded;
p, welding butt welds of the middle roof unit and the chord longitudinal roof;
q, welding fillet welds of the middle top plate unit connecting plate and the middle partition plate unit;
r, welding butt welds of the middle top plate unit joint plate and the chord embedded part joint plate;
s, welding fillet welds of the chord embedding part connecting plate and the chord lower chord longitudinal beam.
In the above technical solution, further: the manufacturing method of the steel box girder with the embedded chord comprises a pre-deformation control process, wherein the pre-deformation control process comprises the following pre-deformation processes:
pre-deformation process 1: and at the position of an edge box chamber formed by an edge bottom plate unit, an edge partition plate unit and an edge top plate unit on the outer side of the chord member, a jig frame platform at the top end of the jig frame below the edge box chamber is continuously and downwards pre-bent by a fixed value a from inside to outside, wherein the pre-bending value a is used for ensuring that the transverse gradient of the whole steel box girder bridge deck meets the design requirement after the edge box chamber and the chord member lower chord longitudinal beam are welded.
Pre-deformation process 2: and continuously and upwardly pre-bending a certain value b from outside to inside at the position of the chord member, wherein the pre-bending value b is used for ensuring the planeness of the girder base plate after the girder base plate and the middle base plate unit are spliced together.
In the above technical solution, further: the jig frame consists of a total jig frame, a jig frame supporting plate and a jig frame platform; the assembly jig frame is horizontally arranged on the ground, and a plurality of jig frame supporting plates are vertically arranged on the upper horizontal end surface of the assembly jig frame; positioning and supporting a jig frame platform by a jig frame supporting plate; the jig frame platform is used for positioning the steel box girder embedded with the chord members.
In the above technical solution, further: the outline dimension of the steel box girder of the embedded chord is 24.7m wide, 3m high and 16m long; the weight is 320 tons; the pre-bending value a is 4-5 mm; the pre-bending value b is 2-3 mm, and the pre-bending extension length of the pre-bending value b is 256mm.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, the steel box girder units are assembled from inside to outside and from bottom to top in the final middle assembly sequence, so that the difficult problem of difficult control of welding deformation is avoided, and the accurate control of the inward inclination angle of the chord member is ensured.
2. The invention adopts reasonable welding sequence, and avoids the occurrence of welding deformation to the greatest extent.
3. The invention adopts a pre-deformation process, reasonably controls welding deformation, and ensures that the dimensional accuracy of the assembled and positioned steel box girder meets the design requirement.
4. The invention solves the manufacturing difficulty of the embedded chord steel box girder by arranging reasonable assembly sequence, process flow, reasonable welding sequence, pre-deformation process and other measures, controls welding deformation and ensures the precision requirement.
Drawings
FIG. 1 is a schematic view of a conventional steel box girder structure in the prior art;
FIG. 2 is a schematic view of a steel box girder of an embedded chord to be fabricated according to the present invention;
FIG. 3 is a state diagram of a step S1 of a method for manufacturing a steel box girder with embedded chords according to the present invention;
FIG. 4 is a state diagram of a step S2 of the method for manufacturing the steel box girder with the embedded chord member;
FIG. 5 is a state diagram of a step S3 of the method for manufacturing the steel box girder with the embedded chord member;
FIG. 6 is a state diagram of a step S4 of the method for manufacturing the steel box girder with the embedded chord member;
FIG. 7 is a state diagram of a step S5 of the method for manufacturing the steel box girder with the embedded chord member;
FIG. 8 is a schematic diagram of a welding sequence according to the present invention;
FIG. 9 is a schematic diagram of a pre-deformation process 1 according to the present invention;
FIG. 10 is a schematic view of a jig frame used in the pre-deformation process 1 of FIG. 9 according to the present invention;
FIG. 11 is a schematic diagram of a pre-deformation process 2 according to the present invention;
FIG. 12 is an enlarged partial detail view of the pre-deformation position of FIG. 11 in accordance with the present invention;
in the figure: 1-an intermediate bottom plate unit, 101-an intermediate measuring tower vertical datum line; 2-an intermediate separator unit; 3-an intermediate roof unit; 4-chord members, 401-side measuring tower vertical datum lines, 402-longitudinal beam bottom plates, 403-lower chord longitudinal beams and 404-longitudinal beam top plates; 5-side floor units; 6-side separator units; 7-a side roof unit; 8-edge web units, 801-edge web block vertical datum lines; 9-jig frames, 901-jig frame platforms, 902-total jig frames, 903-jig frame support plates; 10-side box.
Detailed Description
The technical solutions according to the embodiments of the present invention will be clearly and completely described below with reference to fig. 2 to 12 in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention is described in terms of an example of a four-bridge main bridge steel box girder: the manufacturing method of the steel box girder with the embedded chord members (shown in fig. 3 to 7) comprises the following steps:
step S1, three middle base plate units 1 are integrated by taking a middle measuring tower vertical datum line 101 as a reference and then positioned on a jig frame 9.
Step S2, after the intermediate diaphragm unit 2 is positioned on the intermediate bottom unit 1, the chords 4 are positioned on both sides of the intermediate diaphragm unit 2 with reference to the side measurement tower vertical reference line 401.
And S3, respectively positioning the side bottom plate unit 5, the side partition plate unit 6 and the side top plate unit 7 on the outer side of the chord member 4 by taking the side measuring tower vertical datum line 401 as a reference.
And S4, positioning the side web plate unit 8 on the outer sides of the side bottom plate unit 5, the side partition plate unit 6 and the side top plate unit 7 by taking the side web plate block vertical datum line 801 as a reference.
Step S5, positioning the intermediate roof unit 3 on the top end of the intermediate partition unit 2 with reference to the intermediate measurement tower vertical reference line 101.
The invention adopts the assembly sequence from inside to outside and from bottom to top, and finally assembles each unit of the steel box girder, adopts a blocking method according to the structural characteristics of the steel box girder, adopts the assembly sequence, and has the purposes of operability and welding deformation control; the difficult problem that welding deformation is difficult to control is effectively avoided, and accurate control of the inward inclination angle of the chord member is ensured.
(as shown in fig. 8) in the above embodiment, further: the method comprises the following welding steps:
A. and welding the butt weld of the middle floor unit 1 and the side floor units 5.
B. The butt weld of the chord 4 stringer base 402 and the middle base plate unit 1 and the side base plate unit 5 is welded.
C. Welding the fillet weld between the middle baffle unit 2 and the middle bottom plate unit 1; and welding the fillet weld of the side partition plate unit 6 and the side bottom plate unit 5.
D. Welding the groove fillet weld and the fillet weld of the edge web plate unit 8 and the edge bottom plate unit 5.
E. And welding butt welding seams between the edge web plate unit 8 and the edge bottom plate unit 5.
F. And welding butt welding seams between the edge web plate unit 8 and the edge baffle plate unit 6.
G. The fillet welds of the chord 4 lower chord stringers 403 with the side bulkhead units 6 and the bulkhead units 2 are welded. Wherein, the upper end of the lower chord longitudinal beam 403 is welded for 400-500 mm, then is stopped for a period of time, and then is welded continuously.
H. Welding the butt welding seam or the penetration fillet welding seam of the wing plates of the side web plate unit 8 and the side baffle plate unit 6.
I. And welding fillet welds of the wing plates of the edge diaphragm unit 8 and the lower chord longitudinal beam 403 of the chord member 4.
J. And welding the upper butt welding seam of the side web plate unit 8 and the side top plate unit 7.
K. And welding butt welding seams of the side roof plate unit 7 and the chord 4 longitudinal beam roof plate 404.
And L, welding the lower butt welding seam of the side web plate unit 8 and the side top plate unit 7.
And M, welding the fillet weld or penetration fillet weld of the side roof plate unit 7 and the side baffle plate unit 6.
And N, welding the fillet weld of the side roof plate unit 7 and the side plate of the lower chord longitudinal beam 403 of the chord member 4.
O, butt welding of the welding intermediate roof unit 3.
P, welding butt welding seams of the middle roof plate unit 3 and the chord 4 longitudinal beam roof plate 404.
Q, welding the fillet weld of the joint plate of the middle top plate unit 3 and the middle partition plate unit 2.
And R, welding butt welding seams of the connecting plate of the middle top plate unit 3 and the connecting plate of the embedded part of the chord 4.
S, welding fillet welds of the chord 4 embedded part joint plate and the chord 4 lower chord longitudinal beam 403.
Therefore, the welding process can release the stress after welding as much as possible after each welding operation by adopting the welding sequence because the welding process can generate heat and the heat can cause deformation; by adopting the welding sequence, synchronous, simultaneous and same-direction welding operation is considered, so that the occurrence of welding deformation problem can be effectively reduced; therefore, the welding deformation problem can be avoided to the greatest extent by adopting the reasonable welding sequence.
In the above embodiment, further: the manufacturing method of the steel box girder with the embedded chord comprises a pre-deformation control process, wherein the pre-deformation control process comprises the following pre-deformation processes:
pre-deformation process 1 (as shown in fig. 9): at the position of a side box chamber 10 formed by a side bottom plate unit 5, a side partition plate unit 6 and a side top plate unit 7 outside the chord member 4, a jig frame platform 901 at the top end of a jig frame 9 below the side box chamber 10 is continuously and downwards pre-bent by a fixed value a from inside to outside, and the pre-bent value a is used for ensuring that the transverse gradient of the whole steel box girder bridge deck meets the design requirement after the side box chamber 10 and the chord member 4 lower chord longitudinal beam 403 are welded. In the above embodiment, further: the pre-bending value a is 4-5 mm.
(as shown in fig. 10) in the above embodiment, further: the jig frame 9 consists of a total jig frame 902, a jig frame supporting plate 903 and a jig frame platform 901; the total jig frame 902 is horizontally arranged on the ground, and a plurality of jig frame supporting plates 903 are vertically arranged on the upper horizontal end surface of the total jig frame 902; a plurality of jig support plates 903 are gradually reduced from inside to outside in vertical support height, and the jig support plates 903 are positioned to support the pre-deformed jig platform 901 which is obliquely downward; the jig frame platform 901 is used for positioning steel box girders with embedded chords.
Therefore, the steel box girder side box chamber 10 is positioned on the jig frame platform 901 by pre-bending the jig frame platform 901 in the jig frame 9 downwards by 4-5 mm, so that the steel box girder side box chamber 10 is driven to pre-bend downwards by 4-5 mm, and the problem of how the transverse gradient of the whole steel box girder bridge deck meets the design requirement is solved.
Pre-deformation process 2 (as shown in fig. 11, 12): the longitudinal beam floor 402 is continuously pre-bent upwardly from the outside to the inside of the chord 4 by a predetermined value b for ensuring the flatness of the longitudinal beam floor 402 after the total butt joint with the intermediate floor unit 1.
In the above embodiment, further: the outline dimension of the steel box girder of the embedded chord is 24.7m wide, 3m high and 16m long; the weight is 320 tons; the pre-bending value b is 2-3 mm, and the pre-bending extension length of the pre-bending value b is 256mm.
Because the butt weld between the stringer base plate 402 of the chord member 4 and the corresponding middle base plate unit 1 on the right side is affected by heat, the weld is subjected to concave shrinkage deformation, so the deformation of the jig frame 9 is preset upwards, thereby counteracting the deformation of the steel box girder and ensuring the flatness of the butt seam at the position after the steel box girder is welded.
Therefore, the invention adopts a reasonable pre-deformation process, reasonably controls welding deformation, and ensures that the dimensional accuracy of the assembled and positioned steel box girder meets the design requirement.
In summary, the manufacturing difficulty of the embedded chord steel box girder is solved by arranging reasonable assembly sequence, process flow, reasonable welding sequence, pre-deformation process and other measures; controlling welding deformation; the precision requirement is ensured. The manufacturing method of the steel box girder embedded with the chord members can completely meet the precision requirement of the steel box girder, effectively ensure the geometric dimension and the weld quality of the chord member longitudinal girder, greatly improve the production efficiency, have extremely high practical and popularization values, provide references for the manufacture of the same type of steel members, and play a very good reference role.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (5)
1. The manufacturing method of the steel box girder with the embedded chord is characterized by comprising the following steps:
s1, taking a vertical datum line (101) of a middle measuring tower as a datum, and positioning three middle bottom plate units (1) on a jig frame (9) after forming a whole;
s2, after the middle partition plate unit (2) is positioned on the middle bottom plate unit (1), positioning chords (4) on two sides of the middle partition plate unit (2) respectively by taking a side measuring tower vertical datum line (401) as a reference;
s3, respectively positioning a side bottom plate unit (5), a side baffle plate unit (6) and a side top plate unit (7) on the outer side of the chord member (4) by taking a side measuring tower vertical datum line (401) as a reference;
s4, positioning the edge web plate unit (8) on the outer sides of the edge bottom plate unit (5), the edge partition plate unit (6) and the edge top plate unit (7) by taking an edge web plate block vertical datum line (801) as a reference;
s5, positioning the middle top plate unit (3) at the top end of the middle partition plate unit (2) by taking the middle measuring tower vertical datum line (101) as a reference.
2. The method of manufacturing a steel box girder with embedded chords according to claim 1, comprising the following welding sequence:
A. welding butt welds of the middle bottom plate unit (1) and the side bottom plate units (5);
B. welding butt welds of the chord member (4) and the longitudinal beam bottom plate (402) and the middle bottom plate unit (1) and the side bottom plate units (5);
C. welding fillet welds of the middle baffle plate unit (2) and the middle bottom plate unit (1); welding a fillet weld between the side baffle plate unit (6) and the side bottom plate unit (5);
D. welding a groove fillet weld and a fillet weld of the edge web plate unit (8) and the edge bottom plate unit (5);
E. welding butt welding seams between the edge web plate unit (8) and the edge bottom plate unit (5);
F. welding butt welding seams between the edge web plate unit (8) and the edge partition plate unit (6);
G. welding fillet welds of the lower chord longitudinal beam (403) of the chord member (4) with the side baffle unit (6) and the middle baffle unit (2);
H. welding butt welding seams or penetration fillet welding seams of wing plates of the edge web plate unit (8) and the edge baffle plate unit (6);
I. welding fillet welds of wing plates of the edge separation plate units (6) and lower chord stringers (403) of the chords (4);
J. welding an upper butt welding seam of the side web plate unit (8) and the side top plate unit (7);
K. welding butt welding seams of the side roof plate units (7) and the longitudinal beam roof plates (404) of the chords (4);
l, welding a lower butt welding seam of the side web plate unit (8) and the side top plate unit (7);
m, welding a fillet weld or a penetration fillet weld of the side top plate unit (7) and the side baffle plate unit (6);
n, welding fillet welds of side roof units (7) and side plates of a lower chord longitudinal beam (403) of the chord member (4);
o, welding butt welding seams of the middle top plate unit (3);
p, welding butt welds of the middle roof unit (3) and the longitudinal beam roof (404) of the chord member (4);
q, welding fillet welds between the connecting plate of the middle top plate unit (3) and the middle partition plate unit (2);
r, welding butt welds of the connecting plate of the middle top plate unit (3) and the connecting plate of the embedded part of the chord member (4);
s, welding fillet welds of the embedded part joint plate of the chord member (4) and the lower chord longitudinal beam (403) of the chord member (4).
3. A method of manufacturing a steel box girder with embedded chords according to claim 1 or 2, comprising a pre-deformation control process comprising the pre-deformation process of:
pre-deformation process 1: at the position of a side box chamber (10) formed by a side bottom plate unit (5), a side baffle plate unit (6) and a side top plate unit (7) at the outer side of the chord member (4), continuously and downwards pre-bending a jig frame platform (901) at the top end of a jig frame (9) below the side box chamber (10) by a certain value a from inside to outside, wherein the pre-bending value a is used for ensuring that the transverse gradient of the whole steel box girder bridge deck meets the design requirement after the side box chamber (10) and a lower chord longitudinal beam (403) of the chord member (4) are welded;
pre-deformation process 2: the position of the chord member (4) extending out of the longitudinal beam bottom plate (402) is continuously and upwardly pre-bent from outside to inside by a certain value b, wherein the pre-bending value b is used for ensuring the flatness of the longitudinal beam bottom plate (402) after the longitudinal beam bottom plate and the middle bottom plate unit (1) are assembled together.
4. A method of manufacturing a steel box girder with embedded chords according to claim 3, wherein: the jig frame (9) consists of a total jig frame (902), a jig frame supporting plate (903) and a jig frame platform (901); the total jig frame (902) is horizontally arranged on the ground, and a plurality of jig frame supporting plates (903) are vertically arranged on the upper horizontal end surface of the total jig frame (902); the jig frame supporting plate (903) is used for positioning and supporting the jig frame platform (901); the jig frame platform (901) is used for positioning a steel box girder embedded with a chord.
5. A method of manufacturing a steel box girder with embedded chords according to claim 3, wherein: the outline dimension of the steel box girder of the embedded chord is 24.7m wide, 3m high and 16m long; the weight is 320 tons; the pre-bending value a is 4-5 mm; the pre-bending value b is 2-3 mm, and the pre-bending extension length of the pre-bending value b is 256mm.
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| CN202210700524.6A CN115070242B (en) | 2022-06-20 | 2022-06-20 | Manufacturing method of steel box girder with embedded chord |
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| CN114178736A (en) * | 2021-12-31 | 2022-03-15 | 中铁宝桥集团有限公司 | Control method for ultra-wide steel box girder total splicing cross slope |
| CN114434105A (en) * | 2022-01-28 | 2022-05-06 | 中铁宝桥（扬州）有限公司 | Method for manufacturing hyperbolic chord member of bridge bolted steel truss girder |
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| CN114178736A (en) * | 2021-12-31 | 2022-03-15 | 中铁宝桥集团有限公司 | Control method for ultra-wide steel box girder total splicing cross slope |
| CN114434105A (en) * | 2022-01-28 | 2022-05-06 | 中铁宝桥（扬州）有限公司 | Method for manufacturing hyperbolic chord member of bridge bolted steel truss girder |
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