CN105696451B - The wide box girder bridge girder base arrangement and its construction method of Bottom slab breaking can be prevented - Google Patents
The wide box girder bridge girder base arrangement and its construction method of Bottom slab breaking can be prevented Download PDFInfo
- Publication number
- CN105696451B CN105696451B CN201610214467.5A CN201610214467A CN105696451B CN 105696451 B CN105696451 B CN 105696451B CN 201610214467 A CN201610214467 A CN 201610214467A CN 105696451 B CN105696451 B CN 105696451B
- Authority
- CN
- China
- Prior art keywords
- base plate
- prestressed reinforcement
- vertical prestressed
- crossbeam
- tensioning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
- E01D2101/285—Composite prestressed concrete-metal
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
A kind of wide box girder bridge girder base plate for preventing Bottom slab breaking, to there is spaced base plate to thicken crossbeam, has in the bottom surface of base plate and base plate thickeies crossbeam corresponding steel plate up and down on the base plate top for being equipped with baseboard prestress lengths of rebar along along bridge；There is the vertical prestressed reinforcement being made up of finish rolling deformed bar in base plate thickeies crossbeam and base plate, the upper end that vertical prestressed reinforcement stretches out base plate thickening crossbeam is fixed by nut respectively with the lower end for stretching out steel plate.During construction, with the mode tensioning vertical prestressed reinforcement for screwing end nut under vertical prestressed reinforcement, and the elongation of vertical prestressed reinforcement is controlled by calculated value.The kingpost baseplate thickeies crossbeam by base plate strengthens foolrstiffness；Radial load of the tensioning baseboard prestress reinforcing bar to base plate is offset with vertical prestressed reinforcement, the two combination can effectively prevent construction from neutralizing kingpost baseplate after bridge puts into effect and burst apart.
Description
Technical field
The present invention relates to highway bridge, particularly a kind of wide box girder bridge girder base arrangement for preventing Bottom slab breaking and
Its construction method.
Background technology
Wide box beam bridge of the present invention refers to base plate average thickness (bottom at base plate thickness and girder root at girder span centre
The average value of plate thickness sum) for baseplate width 1/50~1/20 single box single chamber prestressed concrete continuous beam and in advance should
Power concrete continuous rigid structure bridge.
The girder of this wide box beam bridge is easily sent out because following reasons cause its base plate to be neutralized after bridge puts into effect in construction
Life is burst apart：
Girder height at span centre and side fulcrum is smaller, highly larger at central bearing point, deck-molding at central bearing point it is general with
Parabolic makes base plate form curved surface to the deck-molding transition at span centre and side fulcrum (see Fig. 1).Baseboard prestress steel bar arrangement
In in base plate, the arrangement shape on its facade is similar to base plate, also curvilinear.Curved baseboard prestress reinforcing bar is with tensioning
Power NpAfter tensioning radial load (see Fig. 2), because base plate average thickness is too small with the ratio between baseplate width, the length of base plate can be produced to base plate
Thin to make foolrstiffness not enough than excessive, under the radial load effect of baseboard prestress reinforcing bar, base plate is susceptible to burst apart.
The conventional method of wide box beam bridge Bottom slab breaking is prevented, is to set to prevent collapsing reinforcing bar in base plate.What the method was present asks
Topic is：One is that the anti-design for collapsing reinforcing bar lacks foundation, including anti-collapse spacing that whether reinforcing bar set, set, used prevents collapsing reinforcing bar
Reinforcing bar grade and diameter etc. without directly regulation；Two is to prevent that collapsing reinforcing bar is difficult to clasp baseboard prestress reinforcing bar completely in constructing
Bellows, is difficult to play a role；Three is that can not solve the problems, such as that base plate stiffness by itself is not enough.
The content of the invention
For the problem that the above-mentioned conventional method for preventing wide box beam bridge Bottom slab breaking is present, it is an object of the invention to provide
A kind of wide box girder bridge girder base arrangement and its construction method that can effectively prevent Bottom slab breaking.
The wide box girder bridge girder base arrangement of the prevented Bottom slab breaking that the present invention is provided, is being equipped with baseboard prestress steel
The base plate top of muscle section, to there is spaced base plate to thicken crossbeam, has in the bottom surface of base plate and is thickeied on crossbeam with base plate along along bridge
Under corresponding steel plate, base plate thickeies the top surface of crossbeam and the bottom surface of steel plate is the level of state；In base plate thickeies crossbeam and base plate
Be spaced apart, corresponding duct up and down, the vertical prestressed reinforcement being made up of finish rolling deformed bar is installed with duct, it is vertical pre-
The upper end that stress reinforcing bar stretches out base plate thickening crossbeam is fixed by nut respectively with the lower end for stretching out steel plate.
The base plate thicken crossbeam along along bridge to mutual distance svSpan be：150cm≤sv≤300cm；Base plate
Thicken the centre-height d of crossbeam2Span be：(K/15-dj)≤d2≤(K/10-dj), K is baseplate width, d in formulajFor
Base plate average thickness.
The construction method of above-mentioned wide box girder bridge girder base arrangement is comprised the following steps：
Step 1, pour girder
After setting up template and assembling reinforcement (including girder and base plate thicken the reinforcing bar of crossbeam) by design, girder and bottom are poured
Plate thickeies the concrete of crossbeam, while in the bottom surface pre-embedded steel slab of base plate, it is right up and down to be reserved in base plate thickeies crossbeam and base plate
The duct answered, reserves drilling corresponding with the duct in steel plate；
Step 2, installation and tensioning vertical prestressed reinforcement
When the concrete strength of step 1 reaches 90% design strength, vertical prestressed reinforcement is added by root through base plate
The drilling in the duct and steel plate reserved in thick crossbeam and base plate, using the nut of vertical prestressed reinforcement upper end by vertical prestressing
The upper end of reinforcing bar is fixed on the top that base plate thickeies crossbeam (nut and base plate put steel washer between thickening crossbeam)；Screwed with finger
The nut of vertical prestressed reinforcement lower end, makes it be adjacent to surface of steel plate, can not continue to screw with finger normal forces vertically pre-
Its lower end is stretched out on the basis of the length of nut during stress reinforcing bar, is continued to screw the spiral shell of vertical prestressed reinforcement lower end with screwing tool
Female mode carries out tensioning to vertical prestressed reinforcement, while measuring the increase that nut length is stretched out in vertical prestressed reinforcement lower end
Value, vertical prestressed reinforcement stretching extension value is defined as by the value added, treats that vertical prestressed reinforcement stretching extension value reaches limit
Stop tensioning vertical prestressed reinforcement during definite value Δ；
Limit value Δ is tried to achieve as the following formula：
In formula
σcon：The design tension stress (MPa) of baseboard prestress reinforcing bar,
AP：Total cross-sectional area (the mm of baseboard prestress reinforcing bar2),
sv：Base plate thicken crossbeam along along bridge to it is mutual away from (m),
n：The vertical prestressed reinforcement limb number on crossbeam is thickeied in same base plate,
r：The circular curve radius (m) of base plate, when for other curve forms, according toCalculating is taken, its
Middle l is curve chord length, and β is the ratio between curve rise f and chord length l,
Es：The elastic modelling quantity (MPa) of vertical prestressed reinforcement (5),
Apv：Area of section (the mm of single limb vertical prestressed reinforcement2),
d1：Base plate thickness (mm),
d2：Base plate thickeies the centre-height (mm) of crossbeam；
Step 3, tensioning baseboard prestress reinforcing bar
After all vertical prestressed reinforcement whole tensioning are finished, tensioning baseboard prestress reinforcing bar completes wide box beam bridge master
Beam base arrangement is constructed.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) thickening crossbeam by base plate strengthens the rigidity of base plate；Tensioning base plate can be offset by vertical prestressed reinforcement
To the radial load of base plate, the two is combined deformed bar, can effectively prevent base plate in tensioning baseboard prestress reinforcing bar and bridge
Burst apart after putting into effect.
(2) during tensioning vertical prestressed reinforcement, the limit value Δ calculated according to computing formula controls vertical prestressing steel
Muscle stretching extension value, the prestressing force that can produce vertical prestressed reinforcement offsets the radial direction of baseboard prestress reinforcing bar generation just
Power, plays a part of effectively to prevent base plate from bursting apart, and base arrangement will not be caused damage because of excessive tensioning again.
Brief description of the drawings
Fig. 1 is the side view of wide box girder bridge girder of the present invention；
Fig. 2 is baseboard prestress reinforcing bar radial load schematic diagram；
Fig. 3 is base plate curve chord length l and rise f schematic diagrames；
Fig. 4 is along girder longitudinal direction partial sectional view；
Fig. 5 is A-A sectional drawings in Fig. 4；
Fig. 6 is Fig. 4 middle parts B enlarged drawings.
In figure：1-girder, 2-base plate, 3-baseboard prestress reinforcing bar, 4-steel washer, 5-vertical prestressed reinforcement, 6-base plate
Thicken crossbeam, 7-duct, 8-steel plate, 9-nut.
Specific embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
As shown in figure 1, it is prestressed concrete continuous rigid-framed bridge that the present embodiment can prevent the wide box beam bridge of Bottom slab breaking,
Its base plate 2 is curved surface, and the baseboard prestress reinforcing bar 3 being placed in base plate is also curvilinear.The span of the girder 1 of wide box beam bridge is
90m, span centre deck-molding 2.2m, deck-molding 5.5m at central bearing point.Baseplate width K=1200cm；Base plate thickness is 25cm at span centre KZ,
Base plate thickness is 50cm, base plate average thickness d at the GB of girder rootj=37.5cm, is the 1/32 of baseplate width, belongs to wide cut
Box girder bridge.The base plate thickness for being equipped with baseboard prestress reinforcing bar is cumulative to 37.0cm by 25.0cm.
As shown in figure 3, span centre base plate curve chord length l=84.0m, can be obtained, rise f=by the deck-molding of span centre and central bearing point
5.5-2.2=3.3m, tries to achieve the circular curve radius of base plate
As shown in figure 4, being disposed with 16 bottom hole board prestress reinforcing bars, the baseboard prestress reinforcing bar in single duct altogether on base plate
Area of section be 2919mm2, the total cross-sectional area of 16 bottom hole board prestress reinforcing bars is AP=46704mm2, baseboard prestress steel
The design tension stress σ of musclecon=1395MPa (the stretching force N of baseboard prestress reinforcing bar shown in Fig. 2pIt is corresponding).
As shown in Fig. 2 curved baseboard prestress reinforcing bar is with stretching force NpAfter tensioning radial load can be produced to base plate.Cause
Base plate average thickness is too small with the ratio between baseplate width, and the slenderness ratio of base plate is excessive, makes foolrstiffness not enough, and construction neutralizes bridge and throws
After entering operation, under the radial load effect that tensioning baseboard prestress reinforcing bar is produced, base plate is susceptible to deformation of bursting apart.
As shown in Figure 4, Figure 5 and Figure 6, to prevent base plate from bursting apart, base plate top pour along bridge longitudinal direction each other away from
svThe base plate of=2.5m thickeies crossbeam 6, and it is in trapezoidal class that base plate thickeies section of beam, and base plate thickeies crossbeam centre-height d2=55cm,
When pouring, the Q235C shape steel plates 8 of pre-buried thick 20mm, 10cm wide in the bottom surface of base plate, and base plate is thickeied the top surface and steel of crossbeam
The bottom surface of plate is the level of state.In base plate thickeies crossbeam and base plate using metal bellows it is reserved each other away from 3200mm,
4 ducts 7 of 4400mm, 3200mm, the wherein duct of both sides be located at base plate thicken crossbeam two ends, processed in steel plate with
The corresponding drilling in the duct；With the PSB785 finish rolling deformed bars of a diameter of 18mm as (its springform of vertical prestressed reinforcement 5
Amount Es=2.0 × 105Mpa, the area of section A of single limb vertical prestressed reinforcementpv=254.4mm2), it is each passed through base plate and thickeies horizontal
The drilling in duct and steel plate in beam and base plate, it stretches out, and base plate thickeies the upper end of crossbeam and the lower end for stretching out steel plate is used respectively
Nut 9 is fixed, and same base plate thickeies the vertical prestressed reinforcement limb number n=4 on crossbeam.
The girder of said structure is constructed according to the following steps：
Step 1, pour girder
After setting up template and assembling reinforcement by design, pour girder and base plate thickeies the concrete of crossbeam, while in base plate
The pre-buried steel plate in bottom surface, reserve the duct in base plate thickeies crossbeam and base plate, processed in steel plate and the duct
Corresponding drilling；
Step 2, installation and tensioning vertical prestressed reinforcement
When the concrete strength of step 1 reaches 90% design strength, vertical prestressed reinforcement is thickeied horizontal through base plate
The drilling in the duct and steel plate reserved in beam and base plate, will be vertical using the nut and steel washer 4 of vertical prestressed reinforcement upper end
The upper end of deformed bar is fixed on base plate and thickeies crossbeam top, and the nut of vertical prestressed reinforcement lower end is screwed with finger, makes
It is adjacent to surface of steel plate, when finger normal forces can not continue to screw vertical prestressed reinforcement, with now vertical prestressing
Reinforcing bar lower end is stretched out on the basis of the length of nut, is continued to screw the mode of the nut of vertical prestressed reinforcement lower end with screwing tool
Tensioning is carried out to vertical prestressed reinforcement, while being measured under vertical prestressed reinforcement with the electronic digital indicator that precision is 0.01mm
The value added of nut length is stretched out at end, and the value added is defined as into vertical prestressed reinforcement stretching extension value, treats vertical prestressing
Reinforced bar stretching elongation stops tensioning vertical prestressed reinforcement when reaching its limit value Δ.
By taking one section of base plate shown in Fig. 4 as an example, to should section base plate have 1#~11# totally 11 base plates thicken crossbeam, each
Base plate is thickeied on crossbeam 4 vertical prestressed reinforcements (as shown in Figure 5), and correspondence 1#~11# base plates are thickeied the base plate of crossbeam
Thickness d1In substitution following formula：
Calculate vertical prestressed reinforcement stretching extension value limit value Δ that corresponding 1#~11# base plates are thickeied on crossbeam such as
Following table：
| Base plate thickeies crossbeam numbering | 1# | 2# | 3# | 4# | 5# | 6# | 7# | 8# | 9# | 10# | 11# |
| Base plate thickness d1(mm) | 250 | 262 | 274 | 286 | 298 | 310 | 322 | 334 | 346 | 358.0 | 370.0 |
| Limit value Δ (mm) | 2.38 | 2.42 | 2.45 | 2.49 | 2.52 | 2.56 | 2.59 | 2.63 | 2.67 | 2.70 | 2.74 |
Press listed limit value in table respectively to the vertical prestressed reinforcement that this section of 1#~11# base plate of base plate is thickeied on crossbeam
Δ carries out tensioning；Δ value is calculated in the same way to the vertical prestressed reinforcement on base plate other base plates thickening crossbeam, and by Δ
Value carries out tensioning.
Step 3, tensioning baseboard prestress reinforcing bar
After all vertical prestressed reinforcement whole tensioning are finished, tensioning baseboard prestress reinforcing bar completes wide box beam bridge master
Beam base arrangement is constructed.
In construction, base plate bursts apart phenomenon in tensioning baseboard prestress reinforcing bar；After bridge puts into effect, through 1 year
Time tests, and base plate also bursts apart, it was demonstrated that the present invention works well.
Claims (1)
1. a kind of construction method of the wide box girder bridge girder base arrangement for preventing Bottom slab breaking, described to prevent Bottom slab breaking
Wide box girder bridge girder base arrangement be：Be equipped with base plate (2) top of baseboard prestress reinforcing bar (3) section along along bridge to having between
Crossbeam (6) is thickeied every the base plate for setting, is had in the bottom surface of base plate and is thickeied crossbeam corresponding steel plate (8) up and down with base plate, base plate adds
The top surface of thick crossbeam and the bottom surface of steel plate are the level of state；It is spaced apart in base plate thickeies crossbeam and base plate, is corresponded to up and down
Duct (7), the vertical prestressed reinforcement (5) being made up of finish rolling deformed bar is installed with duct, vertical prestressed reinforcement stretches out
The upper end that base plate thickeies crossbeam is fixed by nut (9) respectively with the lower end for stretching out steel plate；Its construction method is comprised the following steps：
Step 1, pour girder
After setting up template and assembling reinforcement by design, pour girder and base plate thickeies the concrete of crossbeam, while at the bottom of base plate
Face pre-embedded steel slab, reserves corresponding duct up and down in base plate thickeies crossbeam and base plate, is reserved in steel plate corresponding with the duct
Drilling；
Step 2, installation and tensioning vertical prestressed reinforcement
When the concrete strength of step 1 reaches 90% design strength, vertical prestressed reinforcement is thickeied horizontal by root through base plate
The drilling in the duct and steel plate reserved in beam and base plate, using the nut of vertical prestressed reinforcement upper end by vertical prestressed reinforcement
Upper end be fixed on base plate thicken crossbeam top；The nut of vertical prestressed reinforcement lower end is screwed with finger, makes itself and steel plate
Surface is adjacent to, and the length of nut is stretched out as base in its lower end when can not continue to screw vertical prestressed reinforcement with finger normal forces
Standard, the mode of the nut for being continued to screw vertical prestressed reinforcement lower end with screwing tool carries out tensioning to vertical prestressed reinforcement,
The value added that nut length is stretched out in vertical prestressed reinforcement lower end is measured simultaneously, and the value added is defined as vertical prestressed reinforcement
Stretching extension value, stops tensioning vertical prestressed reinforcement when vertical prestressed reinforcement stretching extension value reaches limit value Δ；
Limit value Δ is tried to achieve as the following formula：
In formula
σcon：The design tension stress of baseboard prestress reinforcing bar,
AP：The total cross-sectional area of baseboard prestress reinforcing bar,
sv：Base plate thicken crossbeam along along bridge to it is mutual away from,
n：The vertical prestressed reinforcement limb number on crossbeam is thickeied in same base plate,
r：The circular curve radius of base plate, when for other curve forms, according toCalculating is taken, and wherein l is curve
Chord length, β is the ratio between curve rise f and chord length l,
Es：The elastic modelling quantity of vertical prestressed reinforcement,
Apv：The area of section of single limb vertical prestressed reinforcement,
d1：Base plate thickness,
d2：Base plate thickeies the centre-height of crossbeam；
Step 3, tensioning baseboard prestress reinforcing bar
After all vertical prestressed reinforcement whole tensioning are finished, tensioning baseboard prestress reinforcing bar completes wide box girder bridge girder bottom
Plate structure construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610214467.5A CN105696451B (en) | 2016-04-07 | 2016-04-07 | The wide box girder bridge girder base arrangement and its construction method of Bottom slab breaking can be prevented |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610214467.5A CN105696451B (en) | 2016-04-07 | 2016-04-07 | The wide box girder bridge girder base arrangement and its construction method of Bottom slab breaking can be prevented |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105696451A CN105696451A (en) | 2016-06-22 |
| CN105696451B true CN105696451B (en) | 2017-05-31 |
Family
ID=56219438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610214467.5A Active CN105696451B (en) | 2016-04-07 | 2016-04-07 | The wide box girder bridge girder base arrangement and its construction method of Bottom slab breaking can be prevented |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105696451B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109468943B (en) * | 2018-10-17 | 2019-07-12 | 华南理工大学 | The anti-ejection system of vertical prestressed reinforcement and its construction method with function of seismic resistance |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004116216A (en) * | 2002-09-27 | 2004-04-15 | Oriental Construction Co Ltd | Reinforcement structure of existing floor slab by metal fiber contained high strength concrete pc board |
| CN202175918U (en) * | 2011-06-17 | 2012-03-28 | 广东工业大学 | Reinforcing structure for inner and outer steel plates on bottom of box girder |
| CN104594211A (en) * | 2015-01-27 | 2015-05-06 | 沈阳建筑大学 | Existing hollow board beam bridge bearing separation consolidating structure and construction method |
| CN204491412U (en) * | 2015-02-07 | 2015-07-22 | 沈阳建筑大学 | A kind of hollow sheet hinge crack structure |
| CN204715226U (en) * | 2015-05-31 | 2015-10-21 | 西安公路研究院 | External prestressing strengthening based on steel plate-concrete anchor block constructs |
| CN105220624A (en) * | 2015-11-06 | 2016-01-06 | 沈阳建筑大学 | A kind of bent cap truss-like reinforcing construction and construction method thereof |
| CN205474787U (en) * | 2016-04-07 | 2016-08-17 | 沈阳建筑大学 | Can prevent broad width box girder bridge girder bottom plate structure that bottom plate bursts apart |
-
2016
- 2016-04-07 CN CN201610214467.5A patent/CN105696451B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004116216A (en) * | 2002-09-27 | 2004-04-15 | Oriental Construction Co Ltd | Reinforcement structure of existing floor slab by metal fiber contained high strength concrete pc board |
| CN202175918U (en) * | 2011-06-17 | 2012-03-28 | 广东工业大学 | Reinforcing structure for inner and outer steel plates on bottom of box girder |
| CN104594211A (en) * | 2015-01-27 | 2015-05-06 | 沈阳建筑大学 | Existing hollow board beam bridge bearing separation consolidating structure and construction method |
| CN204491412U (en) * | 2015-02-07 | 2015-07-22 | 沈阳建筑大学 | A kind of hollow sheet hinge crack structure |
| CN204715226U (en) * | 2015-05-31 | 2015-10-21 | 西安公路研究院 | External prestressing strengthening based on steel plate-concrete anchor block constructs |
| CN105220624A (en) * | 2015-11-06 | 2016-01-06 | 沈阳建筑大学 | A kind of bent cap truss-like reinforcing construction and construction method thereof |
| CN205474787U (en) * | 2016-04-07 | 2016-08-17 | 沈阳建筑大学 | Can prevent broad width box girder bridge girder bottom plate structure that bottom plate bursts apart |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105696451A (en) | 2016-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104612050B (en) | A kind of simply supported beam continuous new construction of bridge bridge floor and constructional method | |
| CN110990922B (en) | Bending-resistant bearing capacity calculation method for section beam under hogging moment effect | |
| CN110172873B (en) | Track plate structure for climbing and manufacturing method | |
| CN114330019B (en) | Method for calculating bending resistance bearing capacity of in-vivo unbonded prestressed corrugated steel web composite beam | |
| CN110688803B (en) | Method for calculating thickness of foot plate of eight-foot-bolt four-zone separation tower of power transmission tower | |
| CN105696451B (en) | The wide box girder bridge girder base arrangement and its construction method of Bottom slab breaking can be prevented | |
| CN205474787U (en) | Can prevent broad width box girder bridge girder bottom plate structure that bottom plate bursts apart | |
| CN113305990B (en) | General combined die for prefabricated stairway and implementation method thereof | |
| CN105887653B (en) | A kind of wide box girder bridge girder base arrangement and its construction method | |
| CN111625895B (en) | Stress safety judgment method for support uneven settlement concrete beam | |
| KR101345197B1 (en) | Psc i-type girder cross-section optimized design methods and their | |
| CN105714698B (en) | A kind of wide box girder bridge girder Bottom slab breaking ruggedized construction and its construction method | |
| CN105821752B (en) | Wide box girder bridge girder roof structure and construction method thereof | |
| CN205501789U (en) | Broad width box girder bridge girder bottom plate structure | |
| CN205604061U (en) | Thoughtlessly congeal soil box ellbeam bridge girder web structure | |
| CN115630458A (en) | Method for casting continuous beam in situ based on elastic foundation beam theory and application thereof | |
| CN105755960B (en) | Method for preventing middle beam of T-shaped beam bridge from generating lateral bending deformation | |
| CN110158983A (en) | A kind of self-balancing type steel underpinning device | |
| CN105714669B (en) | A kind of variable cross-section box girder bridge kingpost baseplate structure and its construction method | |
| CN205501790U (en) | Broad width box girder bridge girder bottom plate reinforced structure that bursts apart | |
| CN114912182A (en) | Calculation method for design bearing capacity of prestress hybrid assembly type frame node | |
| CN110835967B (en) | Method for controlling combined shear wall cracks by adopting prestress | |
| CN209760323U (en) | Pile foundation off normal cushion cap roof beam reinforced structure | |
| CN205501847U (en) | Variable cross section box girder bridge girder bottom plate structure | |
| CN112069584A (en) | Design method of ductile structural pier for railway |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |