CN104695340B - The construction method of concrete box girder Shear Strengthening based on Wavelike steel webplate - Google Patents
The construction method of concrete box girder Shear Strengthening based on Wavelike steel webplate Download PDFInfo
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- CN104695340B CN104695340B CN201510066572.4A CN201510066572A CN104695340B CN 104695340 B CN104695340 B CN 104695340B CN 201510066572 A CN201510066572 A CN 201510066572A CN 104695340 B CN104695340 B CN 104695340B
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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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
Abstract
The invention discloses the construction method of a kind of concrete box girder Shear Strengthening based on Wavelike steel webplate, sequentially include the following steps: successively and carry out construction lofting location at box beam top board and box beam base plate, process and reinforce faying face, box beam top board bottom surface brill anchor hole, the boring of box beam plate top surface bar planting, Wavelike steel webplate blanking, top flange plate boring and polishing, the welding of Wavelike steel webplate and installation, installation reinforced mesh, formwork erection casting concrete.The invention has the advantages that by box beam case indoor location indulge bridge to Wavelike steel webplate component, increase the web quantity of box beam, reduce the principal tensile stress of the original concrete web of box beam, thus reach the purpose of the Shear Strengthening to box girder bridge.
Description
Technical field
The invention belongs to technical field of bridge engineering, particularly relate to the construction method of a kind of concrete box girder Shear Strengthening based on Wavelike steel webplate.
Background technology
At present, one of concrete box-beam bridge main bridge type having become as China's Longspan Bridge.Yet with aspect Shortcomings or defects such as design, construction and operation management, the most in-service large span prestressed concrete box girder bridge has sizeable proportion to occur in that Diagonal Crack in Web, the most directly threatens the durable of bridge and security performance.
Further development for the existing diagonal crack of suppression web, improve the shear resistance of bridge, existing reinforcement means is included in box girder web affixing steel plate or carbon fiber, stretch-draw vertical prestressing and increases web plate section etc., although affixing steel plate or carbon fiber easy construction among these, but increase rate for shear-carrying capacity is limited, and affect the attractive in appearance of bridge；Vertical tension pre-stress construction difficulty is relatively big, and is faced with the problems such as loss of prestress；Increase web plate section and then can roll up bridge deadweight, cause extra load effect to bridge.And above-mentioned three kinds of methods all cannot be obviously improved box girder web original shear distributing state.
Summary of the invention
It is an object of the invention to provide the construction method of a kind of concrete box girder Shear Strengthening based on Wavelike steel webplate, by box beam case indoor location indulge bridge to Wavelike steel webplate component, increase the web quantity of box beam, reduce the principal tensile stress of the original concrete web of box beam, thus reach the purpose of the Shear Strengthening to box girder bridge.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that the construction method of concrete box girder Shear Strengthening based on Wavelike steel webplate, sequentially includes the following steps: successively
1) construction lofting location is carried out at box beam top board and box beam base plate: determine following position by this setting-out: the centrage of longitudinal box beam chamber, the i.e. center of Wavelike steel webplate move towards；Box beam top board embedding anchor hole position；Box beam base plate bar planting position；Rear pouring concrete formwork erection position；
2) process and reinforce faying face: carry out in the reinforcing faying face region of box beam top board and box beam base plate polishing, clean, dust removal process；Concrete dabbing process is carried out in the faying face region of box beam plate top surface；
3) anchor hole is bored in box beam top board bottom surface: in the box beam top board embedding anchor hole position of step 1) setting-out, carries out box beam top board bottom surface boring anchor hole；
4) box beam plate top surface boring, bar planting: in the box beam base plate bar planting position of step 1) setting-out, carry out boring bar planting to box beam plate top surface；
5) Wavelike steel webplate blanking: Wavelike steel webplate includes top flange plate, corrugated web and bottom wing listrium, top flange plate, corrugated web and bottom wing listrium piecemeal enter box beam chamber by the manhole that enters of box beam；
6) top flange plate boring, polishing: according to the anchor hole position of the box beam top board bottom surface described in step 3), corresponding hole in top flange plate relevant position, after having holed the contact surface to top flange plate Yu box beam top board bottom surface polish, processing of rust removing；
7) welding of Wavelike steel webplate, installation: inside box beam chamber, corrugated web is welded assembly with top flange plate, bottom wing listrium；Top flange plate carries out anchor bolts with box beam top board bottom surface to be fixed, and crab-bolt sequentially passes through boring and the anchor hole of box beam top board bottom surface of top flange plate, then carries out injecting glue bonding, makes adhesion strength reach required standard；One side corresponding with box beam base plate on bottom wing listrium is fixedly installed peg；
8) reinforced mesh is installed: one layer of reinforced mesh is installed between bottom wing listrium and box beam plate top surface；
9) formwork erection casting concrete: at the rear pouring concrete formwork erection position described in step 1), shuttering casting concrete.
Described step 2) process reinforce in faying face, under conditions of the surface irregularity reinforcing faying face of box beam top board and box beam base plate, use epoxy resin mortar that the reinforcing faying face of box beam top board and box beam base plate is repaired.
Described step 9) concrete that uses is slightly expanded concrete.
Described step 3) box beam top board bottom surface bore in anchor hole, first pass through reinforced concrete protective layer tester and box beam top board detected, then bore anchor hole.
Described step 4) the boring of box beam plate top surface, in bar planting, first pass through reinforced concrete protective layer tester and box beam base plate detected, then hole.
The invention has the advantages that this reinforced construction method by box beam case indoor location indulge bridge to Wavelike steel webplate component, increase the web quantity of box beam, reduce the principal tensile stress of the original concrete web of box beam, thus reaching the Shear Strengthening to box girder bridge, this construction method can avoid the adverse effect that the drafting error of Wavelike steel webplate height brings simultaneously；The use of reinforced concrete protective layer tester, can detect inside concrete bar diameter, position, reinforcing bar distribution and concrete cover to reinforcement thickness, it is simple to punching；The use of slightly expanded concrete, compensate for the contraction of concrete, reaches to prevent and treat distress in concrete, improves the purpose of concrete performance；The structure of the present invention and structure stress are clear and definite, easy construction, dependable performance, can realize concrete box-beam bridge and the Shear Strengthening of prestressed concrete box-beam bridge when different chamber quantity and different cross section form (uiform section and variable cross-section).
Accompanying drawing explanation
Fig. 1 is the standard section schematic diagram of the present invention；
Fig. 2 is A-A sectional schematic diagram in Fig. 1；
Fig. 3 is B-B sectional schematic diagram in Fig. 1；
Fig. 4 is C-C sectional schematic diagram in Fig. 1.
The reference of each parts in figure: 1-box beam, 2-box beam top board, 3-box beam base plate, 4-box beam chamber, 12-crab-bolt, 13-top flange plate, 14-corrugated web, 15-bottom wing listrium, 16-peg, 17-reinforced mesh, 18-post-installing rebar, 19-after-pouring slightly expanded concrete.
Detailed description of the invention
In the present embodiment, crab-bolt 12 selects chemical anchor bolts, in conjunction with shown in Fig. 1 to Fig. 4, and the construction method of the concrete box girder Shear Strengthening based on Wavelike steel webplate of the present invention, sequentially include the following steps: successively
1) construction lofting location is carried out at box beam top board 2 and box beam base plate 3: determine following position by this setting-out: the centrage of longitudinal box beam chamber 4, the i.e. center of Wavelike steel webplate move towards；Box beam top board embedding anchor hole position；Box beam base plate bar planting position；Rear pouring concrete formwork erection position；
2) process and reinforce faying face: carry out in the reinforcing faying face region of box beam top board 2 and box beam base plate 3 polishing, clean, dust removal process, under conditions of the surface reinforcing faying face of box beam top board 2 and box beam base plate 3 is the most uneven, can use epoxy resin mortar that the reinforcing faying face of box beam top board 2 and box beam base plate 3 is repaired；Concrete dabbing process is carried out in the faying face region of box beam base plate 3 end face；
3) anchor hole is bored in box beam top board 2 bottom surface: in the box beam top board embedding anchor hole position of step 1) setting-out; by reinforced concrete protective layer tester (reinforced concrete protective layer tester is prior art), box beam top board 2 is detected, carry out box beam top board 2 bottom surface the most again boring anchor hole；
4) box beam base plate 3 end face boring, bar planting: in the box beam base plate bar planting position of step 1) setting-out; by reinforced concrete protective layer tester (reinforced concrete protective layer tester is prior art), box beam base plate 3 is detected; the most again box beam base plate 3 end face holed and implant reinforcing bar, forming post-installing rebar 18；
5) Wavelike steel webplate blanking: Wavelike steel webplate includes top flange plate 13, corrugated web 14 and bottom wing listrium 15, top flange plate 13, corrugated web 14 and bottom wing listrium 15 piecemeal enter box beam chamber 4 by the manhole that enters of box beam 1；
6) top flange plate 13 is holed, is polished: bore anchor hole position according to the box beam top board bottom surface described in step 3), corresponding hole in top flange plate 13 relevant position, after having holed, contact surface with box beam top board 2 bottom surface on top flange plate 13 is polished, processing of rust removing；
7) welding of Wavelike steel webplate, installation: inside box beam chamber 4, with top flange plate 13, bottom wing listrium 15, corrugated web 14 is welded assembly, wherein top flange plate 13 welds with corrugated web 14, corrugated web 14 welds with bottom wing listrium 15；Top flange plate 13 carries out anchor bolts with box beam top board 2 bottom surface to be fixed, and crab-bolt 12 sequentially passes through boring and the anchor hole of box beam top board 2 bottom surface of top flange plate 13, then carries out injecting glue bonding, makes adhesion strength reach required standard；Peg 16 it is welded to connect on one side corresponding with box beam base plate 3 on bottom wing listrium 15；
8) reinforced mesh is installed: one layer of reinforced mesh 17 is installed between bottom wing listrium 15 and box beam base plate 3 end face and strengthens；
9) formwork erection casting concrete: in the rear pouring concrete formwork erection position described in step 1), shuttering also pours slightly expanded concrete formation after-pouring slightly expanded concrete 19, it is internal that described peg 16 and reinforced mesh 17 are embedded in after-pouring slightly expanded concrete 19, make bottom wing listrium 15 be connected with after-pouring slightly expanded concrete 19 by peg 16, make box beam base plate 3 be connected with after-pouring slightly expanded concrete 19 by post-installing rebar 18.
By above-mentioned reinforced construction method, box beam top board 2 is connected by crab-bolt 12 with top flange plate 13, top flange plate 13 and corrugated web 14 use welding manner to connect, corrugated web 14 and bottom wing listrium I-5 also use welding manner to connect, flange plate 15 and after-pouring slightly expanded concrete 19 are connected by peg 16, after-pouring slightly expanded concrete 19 and box beam base plate 3 are connected by post-installing rebar 18, complete the Shear Strengthening of concrete box girder.
The invention has the advantages that this reinforced construction method by install box beam chamber 4 in vertical bridge to Wavelike steel webplate component, increase the web quantity of box beam 1, the principal tensile stress of the reduction original concrete web of box beam 1, thus reach the Shear Strengthening to box girder bridge；The structure of the present invention and structure stress are clear and definite, easy construction, dependable performance, can realize concrete box-beam bridge and the Shear Strengthening of prestressed concrete box-beam bridge when different chamber quantity and different cross section form (uiform section and variable cross-section).
Above example is only in order to illustrative not limiting technical scheme, although the present invention being described in detail with reference to above-described embodiment, it will be understood by those within the art that: still the present invention can be modified or equivalent, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should be contained in the middle of scope of the presently claimed invention.
Claims (5)
1. the construction method of concrete box girder Shear Strengthening based on Wavelike steel webplate, it is characterised in that sequentially include the following steps: successively
1) construction lofting location is carried out at box beam top board and box beam base plate: determine following position by this setting-out: the centrage of longitudinal box beam chamber, the i.e. center of Wavelike steel webplate move towards；Box beam top board embedding anchor hole position；Box beam base plate bar planting position；Rear pouring concrete formwork erection position；
2) process and reinforce faying face: carry out in the reinforcing faying face region of box beam top board and box beam base plate polishing, clean, dust removal process；Concrete dabbing process is carried out in the faying face region of box beam plate top surface；
3) anchor hole is bored in box beam top board bottom surface: in the box beam top board embedding anchor hole position of step 1) setting-out, carries out box beam top board bottom surface boring anchor hole；
4) box beam plate top surface boring, bar planting: in the box beam base plate bar planting position of step 1) setting-out, carry out boring bar planting to box beam plate top surface；
5) Wavelike steel webplate blanking: Wavelike steel webplate includes top flange plate, corrugated web and bottom wing listrium, top flange plate, corrugated web and bottom wing listrium piecemeal enter box beam chamber by the manhole that enters of box beam；
6) top flange plate boring, polishing: according to the anchor hole position of the box beam top board bottom surface described in step 3), corresponding hole in top flange plate relevant position, after having holed the contact surface to top flange plate Yu box beam top board bottom surface polish, processing of rust removing；
7) welding of Wavelike steel webplate, installation: inside box beam chamber, corrugated web is welded assembly with top flange plate, bottom wing listrium；Top flange plate carries out anchor bolts with box beam top board bottom surface to be fixed, and crab-bolt sequentially passes through boring and the anchor hole of box beam top board bottom surface of top flange plate, then carries out injecting glue bonding, makes adhesion strength reach required standard；One side corresponding with box beam base plate on bottom wing listrium is fixedly installed peg；
8) reinforced mesh is installed: one layer of reinforced mesh is installed between bottom wing listrium and box beam plate top surface；
9) formwork erection casting concrete: at the rear pouring concrete formwork erection position described in step 1), shuttering casting concrete.
The construction method of concrete box girder Shear Strengthening based on Wavelike steel webplate the most according to claim 1, it is characterized in that: described step 2) process reinforce in faying face, under conditions of the surface irregularity reinforcing faying face of box beam top board and box beam base plate, use epoxy resin mortar that the reinforcing faying face of box beam top board and box beam base plate is repaired.
The construction method of concrete box girder Shear Strengthening based on Wavelike steel webplate the most according to claim 1 and 2, it is characterised in that: described step 9) concrete that uses is slightly expanded concrete.
The construction method of concrete box girder Shear Strengthening based on Wavelike steel webplate the most according to claim 1; it is characterized in that: described step 3) box beam top board bottom surface bore in anchor hole; first pass through reinforced concrete protective layer tester box beam top board is detected, then bore anchor hole.
The construction method of concrete box girder Shear Strengthening based on Wavelike steel webplate the most according to claim 1; it is characterized in that: described step 4) the boring of box beam plate top surface, in bar planting; first pass through reinforced concrete protective layer tester box beam base plate is detected, then hole.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108824221A (en) * | 2018-06-22 | 2018-11-16 | 长沙理工大学 | Concrete continuous girder bridge web replacing and reinforcing method based on corrugated sheet steel |
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| CN102561213A (en) * | 2012-02-15 | 2012-07-11 | 中南大学 | Steel plate-concrete composite structure reinforcement method of structural negative moment region |
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Patent Citations (6)
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| KR100733609B1 (en) * | 2006-03-31 | 2007-06-28 | 주식회사 제일엔지니어링 | Reinforcing method of concrete structures using camber of steel beam |
| JP2010265696A (en) * | 2009-05-15 | 2010-11-25 | Sho Bond Constr Co Ltd | Structure and method for reinforcing concrete floor slab |
| CN102561213A (en) * | 2012-02-15 | 2012-07-11 | 中南大学 | Steel plate-concrete composite structure reinforcement method of structural negative moment region |
| CN102561214A (en) * | 2012-02-15 | 2012-07-11 | 中南大学 | Steel plate and concrete composite structure reinforcing method for positive bending moment area |
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| CN108824221A (en) * | 2018-06-22 | 2018-11-16 | 长沙理工大学 | Concrete continuous girder bridge web replacing and reinforcing method based on corrugated sheet steel |
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