CN113882285B - Temporary supporting device in concrete box girder bridge block dismantling hanging box and construction method - Google Patents
Temporary supporting device in concrete box girder bridge block dismantling hanging box and construction method Download PDFInfo
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- CN113882285B CN113882285B CN202111249973.5A CN202111249973A CN113882285B CN 113882285 B CN113882285 B CN 113882285B CN 202111249973 A CN202111249973 A CN 202111249973A CN 113882285 B CN113882285 B CN 113882285B
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- 238000010276 construction Methods 0.000 title claims description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 163
- 239000010959 steel Substances 0.000 claims abstract description 163
- 238000005520 cutting process Methods 0.000 claims abstract description 78
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 24
- 238000005553 drilling Methods 0.000 claims abstract description 19
- 238000004873 anchoring Methods 0.000 claims description 5
- 239000011083 cement mortar Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000005192 partition Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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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Abstract
The invention discloses a temporary supporting device in a concrete box girder bridge block dismantling hanging box, which belongs to the field of bridge engineering and comprises a girder body, wherein the girder body is divided into a plurality of block cutting box girders from the middle to two sides in sequence according to cutting positions, a temporary reinforcing device is arranged at a cavity of one end of the block cutting box girders, the temporary reinforcing device comprises a top steel plate and a bottom steel plate, a supporting steel pipe is arranged between the top steel plate and the bottom steel plate, a second steel plate is welded at the upper end and the lower end of one side of the supporting steel pipe, a diagonal bracing channel steel is arranged at one side of the second steel plate, a drilling hole is arranged at the top side of the cavity, screw steel is arranged in the drilling hole, one end of the screw steel is firmly welded after being wedged with the bottom steel plate, and the other end of the screw steel is fixedly connected with the top side of the block cutting box girders through nuts.
Description
Technical Field
The invention relates to the field of bridge engineering, in particular to a temporary supporting device in a concrete box girder bridge block dismantling hanging box and a construction method.
Background
The Chinese society is developed in a vigorous manner, and the construction of the traffic road network is suitable for the development of the Chinese society, and the construction of the traffic road network also shows the tendency of rapid progress; among the above, many concrete continuous box girder bridges are widely used because of their characteristics of greater structural rigidity, convenience and diversity in construction, short construction period, large span capacity, economical construction cost and the like; some bridges built in early stage are required to be correspondingly modified due to the change of the using functions of the bridges or the upgrading and transformation of lines and urban planning, and some bridges are required to be completely or partially dismantled, so that the number of the bridges is large, the structure is complex, the boundary conditions are various, the dismantling difficulty is high, the technical risk is high, and various hidden diseases can exist at the same time;
The dismantling of the concrete box bridge is a new important branch of bridge engineering, the task is very difficult, and particularly, the dismantling time is very urgent for the concrete box girder bridge with navigation and traffic demands in the dismantling process, so that the dismantling of the bridge is more and more important, and the concrete box girder bridge has great practical significance.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the internal temporary supporting device and the construction method which can improve the overall stability and the dismantling efficiency of the beam body cutting part, increase the safety index, can be repeatedly used, have low manufacturing cost and are simple and convenient to construct.
To achieve the purpose, the invention adopts the following technical scheme:
the invention provides a temporary supporting device in a concrete box girder bridge block dismantling hanging box, which comprises a girder body, wherein the girder body is divided into a plurality of groups of block cutting box girders from the middle to the two sides in sequence according to cutting positions, and a temporary reinforcing device is arranged at a cavity of the block cutting box girders close to one end of a cutting section of the block cutting box girders;
The temporary reinforcing device comprises a top steel plate and a bottom steel plate, wherein the top steel plate and the bottom steel plate are anchored on the upper side and the lower side of a cavity through bolts, a supporting steel pipe is arranged between the top steel plate and the bottom steel plate, a second steel plate is correspondingly welded on the upper end and the lower end of one side of the supporting steel pipe, diagonal bracing channel steel is arranged on one side of the second steel plate, a drill hole is formed in the top side of the cavity, screw thread steel is arranged in the drill hole, one end of the screw thread steel penetrates through the supporting steel pipe and is firmly welded after the bottom steel plate is wedged tightly, and the other end of the screw thread steel penetrates through the top steel plate and is fixedly arranged on the top side of the block cutting box girder through nuts.
The preferable technical scheme of the invention is that hanging point grooves are formed in the four ends of the block cutting box girder, and steel wire ropes penetrate through the four groups of hanging point grooves.
The invention has the preferable technical scheme that the temporary reinforcing device is positioned right above the bridge-removing pipe pile and arranged at two sides of the cut section.
The preferable technical scheme of the invention is that a bridge-dismantling steel pipe bracket is arranged at the bottom side of the beam body corresponding to the temporary reinforcing device.
The preferable technical scheme of the invention is that the cutting section is an inclined plane which is cut downwards along the bottom side of the top side of the beam body.
The preferable technical scheme of the invention is that the four ends of the top side of the bottom steel plate are provided with mounting holes and are fixed on the bottom side of the cavity through bolts.
The preferable technical scheme of the invention is that the diagonal bracing channel steel is arranged in the cavity in a crossing way, and two ends of the diagonal bracing channel steel are respectively welded at two ends of the second steel plates at two sides.
The construction method for the concrete box girder bridge block dismantling comprises the following steps:
step S1: before the girder body is dismantled and constructed, the pier girder is required to be temporarily consolidated, gaps around the support are filled with cement mortar, a cutting section is determined according to a dismantling principle of the main bridge body, and hanging points are arranged at four corners of the girder body to be resected for grooving;
Step S2: vertically and vertically penetrating and drilling holes on the top side of the cavity of the block-cut beam box so as to pass through the lowering of the finish-rolled deformed steel bars;
step S3: the drilling point position uses a laser centralizer to determine an anchoring point at the bottom side of the cavity of the block-cut beam box, a bottom steel plate 13 is placed, and bolts are used for anchoring;
step S4: a top steel plate is stuck to the top side of the cavity of the block cutting beam box corresponding to the position of the drilling hole, screw steel is put downwards from the upper direction of the drilling hole, the contact part of the screw steel and the bottom steel plate is wedged tightly and then welded firmly, and the top side is fixed by adopting double-spliced channel steel and a first steel plate and nuts;
Step S5: correspondingly installing support steel pipes at four corners of the bottom steel plate and the top steel plate, wedging and welding firmly, welding a second steel plate on the support steel pipes at the inner side of the temporary reinforcing device, arranging diagonal bracing channel steel, and welding at the second steel plate;
Step S6: drawing a line on the dismantled structure, marking a cutting block, drilling a working hole with the diameter of 100mm at the intersection point of the cutting line, cutting along the bridge direction, and cutting along the transverse bridge direction;
Step S7: after the whole body is cut off, a steel wire rope penetrates through a hanging point to be slotted and anchored at the beam bottom of the beam body, the beam body is lifted by a gantry crane to be about 20cm high according to a four-point crane, the whole body stays for 5 to 10 minutes, the conditions of the periphery of the beam body and the steel wire rope are checked, and the whole body is regulated to a transport vehicle to be transported to a transport site after being confirmed to be free of errors;
step S8: and after the beam body is transported to a stacking place of the beam body, the temporary reinforcing device is recovered to finish the dismantling.
The preferable technical scheme of the invention is that the cutting line of the cutting section in the step S1 has an outward oblique angle of 2-3 degrees with the vertical line.
The preferable technical scheme of the invention is that the beam Bian Juli after slotting and cutting of the lifting point in the step S1 is 1-1.5 m.
The beneficial effects of the invention are as follows: the invention is based on the concrete box girder bridge dismantling engineering, and the temporary vertical supporting and reinforcing device is additionally arranged at the position of the segmented cutting box girder, so that the stress of a single bottom plate is converted into the stress of a top plate and the bottom plate together, the stability of the segmented girder body is optimized, the engineering risk is reduced, and the working efficiency is improved; meanwhile, the lifting device is simple in structure, convenient to construct and capable of being reused, and particularly when the lifting device has larger lifting capacity, the working efficiency can be greatly improved.
The internal temporary supporting device and the construction method provided by the invention have the advantages that the overall stability and the dismantling efficiency of the beam body cutting position are improved, the safety index is increased, the internal temporary supporting device can be repeatedly utilized, the manufacturing cost is low, and the construction is simple and convenient.
Drawings
FIG. 1 is a schematic cross-sectional view Liang Tizong provided in an embodiment of the present invention;
FIG. 2 is a top view of a beam provided in an embodiment of the present invention;
FIG. 3 is a schematic view of a temporary reinforcing apparatus according to an embodiment of the present invention;
fig. 4 is a schematic view of a hoist provided in an embodiment of the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. Slotting the hanging point; 2. cutting a section; 3. a wire rope; 4. bridge-removing steel pipe bracket; 5. a top steel plate; 6. A beam body; 7. double-spliced channel steel; 8. supporting the steel pipe; 9. screw thread steel; 10. a first steel plate; 11. a second steel plate; 12. diagonal bracing channel steel; 13. and (5) a bottom steel plate.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
The temporary supporting device in the concrete box girder bridge block dismantling hanging box comprises a girder body 6, wherein the girder body 6 is divided into a plurality of groups of block cutting box girders from the middle to two sides in sequence according to cutting positions, a temporary reinforcing device is arranged at a cavity of the block cutting box girders close to one end of a cutting section 2 of the block cutting box girders, the temporary reinforcing device comprises a top steel plate 5 and a bottom steel plate 13 which are anchored on the upper side and the lower side of the cavity through bolts, a supporting steel pipe 8 is arranged between the top steel plate 5 and the bottom steel plate 13, a second steel plate 11 is correspondingly welded at the upper end and the lower end of one side of the supporting steel pipe 8, a diagonal bracing channel steel 12 is arranged on one side of the second steel plate 11, a drill hole is arranged on the top side of the cavity, a threaded steel 9 is arranged in the drill hole, one end of the deformed steel bar 9 passes through the supporting steel tube 8 and is firmly welded after being wedged with the bottom steel plate 13, the other end of the deformed steel bar passes through the top steel plate 5 and is provided with a double-spliced channel steel 7 and a first steel plate 10 on the top side of the block cutting box girder and is fixed by nuts, a temporary reinforcing device for vertical support in the box is additionally arranged at the cavity of the block cutting box girder in the process of cutting and blocking the girder body 6, the top steel plate 5 and the bottom steel plate 13 are matched with the supporting steel tube 8 and the deformed steel bar 9, and the original single bottom plate stress is converted into the common stress of the top plate and the bottom plate through the supporting function of the diagonal bracing channel steel 12, so that the overall stability and the dismantling efficiency of the cut-off part of the girder body 6 are improved, and the safety index is increased; meanwhile, the temporary reinforcing device can be reused, is low in manufacturing cost, is simple and convenient to construct, has a short construction period, and meets the requirements of safety civilized construction and construction period of a dismantling site.
As a possible implementation manner of the scheme, preferably, the four ends of the block cutting box girder are provided with hanging point slots 1, four groups of hanging point slots 1 are internally penetrated by steel wire ropes 3, and the steel wire ropes 3 sequentially penetrate through the four groups of hanging point slots 1, so that a crane can conveniently hoist the block cutting box girder and send the block cutting box girder to a transport vehicle.
As a possible implementation mode of the scheme, preferably, the temporary reinforcing device is located right above the bridge-removing pipe pile and arranged on two sides of the cutting section 2, so that when the sectional cutting is prevented from being dismantled, the block cutting box girder is cracked or even damaged due to dead weight, and the post-transportation is facilitated.
As a possible implementation mode of the scheme, preferably, the bridge-dismantling steel pipe support 4 is arranged at the position, corresponding to the temporary reinforcing device, of the bottom side of the beam body 6, and the bridge-dismantling steel pipe support is used for supporting the block cutting box beam, so that the overall stability of the cut-out position of the beam body 6 is further improved.
As a possible implementation manner of the present solution, preferably, the cutting section 2 is an inclined plane where the top side of the beam body 6 is cut obliquely downward along the bottom side, so that the beam body 6 is convenient to be transported after being cut, and the beam body 6 is prevented from being blocked by an adjacent beam body 6, which causes inconvenient transportation.
As a possible implementation manner of this scheme, preferably, four ends of the top side of the bottom steel plate 13 are provided with mounting holes, and are fixed on the bottom side inside the cavity by bolts, so as to improve the stability of the bottom steel plate 13, so as to provide supporting force for the block cutting box girder and ensure the stability of the girder body 6 after cutting.
As a possible implementation manner of this scheme, preferably, the diagonal bracing channel steel 12 is disposed in the cavity in a crossing manner, and two ends of the diagonal bracing channel steel are welded to two ends of the second steel plates 11 on two sides respectively, so as to provide supporting acting force for the supporting steel pipe 8, and convert single bottom plate stress into common stress of the supporting steel pipe 8, the diagonal bracing channel steel 12, the top steel plate 5 and the bottom steel plate 13, so that stability of the block beam body 6 is optimized, and engineering risk is reduced.
The construction method for the concrete box girder bridge block dismantling comprises the following steps:
step S1: before the girder body 6 is dismantled, the pier girder is temporarily consolidated, cement mortar is adopted to fill gaps around the support, the girder body 6 is prevented from shifting in the dismantling process, the stability of the girder body 6 is improved, the cutting section 2 is determined according to the dismantling principle of the main bridge body 6, hanging point grooves 1 are arranged at four corners of the girder body 6 to be excised, and water grinding drilling is adopted to drill holes with the diameter of 200mm;
Step S2: vertical through drilling is carried out on the top side of the cavity of the block cutting beam box, and the diameter of the drilling is 300mm so as to pass through the lowering of the finish rolling deformed steel bar 9;
Step S3: the drilling point position uses a laser centralizer to determine an anchoring point at the bottom side of a cavity of the block cutting beam box, a bottom steel plate 13 is placed, and the bottom steel plate 13 is anchored by bolts to fix the stability of the bottom steel plate 13 and provide supporting force for the cut beam body 6;
Step S4: a top steel plate 5 is stuck at the position, corresponding to the drilling hole, of the top side in the cavity of the segmented cutting beam box, a deformed steel bar 9 is downwards put from the upper direction of the drilling hole, the contact part of the deformed steel bar 9 and a bottom steel plate 13 is wedged tightly, then the deformed steel bar is firmly welded, the top side is fixed by adopting a double-spliced channel steel 7 and a first steel plate 10 and nuts, the supporting function of the cavity of the segmented cutting beam box is increased, and the engineering dismantling safety is ensured;
Step S5: the four corners of the bottom steel plate 13 and the top steel plate 5 are correspondingly provided with supporting steel pipes 8, are wedged and welded firmly, the inner side of the temporary reinforcing device is welded with a second steel plate 11 on the supporting steel pipes 8, is provided with diagonal bracing channel steel 12, is welded at the second steel plate 11, so that the stress of a single bottom plate is converted into the common stress of a top plate and a bottom plate, and the bearing capacity and the stability of the block cutting box girder are increased through the supporting steel pipes 8 and the diagonal bracing channel steel 12, so that the dismantling risk is reduced;
Step S6: drawing a line on the dismantled structure, marking a cutting block, drilling a working hole with the diameter of 100mm at the intersection point of the cutting line, cutting along the bridge direction, and cutting along the transverse bridge direction;
Step S7: after the whole body is cut off, the steel wire rope 3 passes through the hanging point slot 1 and is anchored at the beam bottom of the beam body 6, the beam body is lifted by a gantry crane to be about 20cm high according to a four-point crane, the whole body stays for 5 to 10 minutes, the conditions of the periphery of the beam body 6 and the steel wire rope 3 are checked, and the whole body is regulated to a transport vehicle to be transported out of the site after confirming no errors;
step S8: and after the beam body 6 is transported to a stacking place, the temporary reinforcing device is recovered to finish the dismantling.
As a possible implementation manner of the scheme, preferably, the cutting line of the cutting section 2 in the step S1 has an outward oblique angle of 2-3 degrees with the vertical line, so that the split cutting box girder is conveniently transported after cutting, and the situation that the cutting is blocked between the girder and the adjacent girder body and the transportation efficiency is affected is prevented.
As a possible implementation manner of the present solution, preferably, the distance between the hanging point slot 1 and the beam edge after cutting in the step S1 is 1-1.5 m.
While the application has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the application. The application is not to be limited by the specific embodiments disclosed herein, but rather, embodiments falling within the scope of the appended claims are intended to be embraced by the application.
Claims (7)
1. Temporary supporting device in concrete box girder bridge partition dismantling hanging box, which is characterized in that: the cutting box girder comprises a girder body (6), wherein the girder body (6) is divided into a plurality of groups of block cutting box girders from the middle to the two sides in sequence according to cutting positions, and a temporary reinforcing device is arranged at a cavity of the block cutting box girders, which is close to one end of a cutting section (2);
The temporary reinforcing device comprises a top steel plate (5) and a bottom steel plate (13) which are anchored on the upper side and the lower side of a cavity through bolts, a supporting steel pipe (8) is arranged between the top steel plate (5) and the bottom steel plate (13), a second steel plate (11) is correspondingly welded at the upper end and the lower end of one side of the supporting steel pipe (8), a diagonal bracing channel steel (12) is arranged at one side of the second steel plate (11), a drill hole is formed in the top side of the cavity, a threaded steel (9) is arranged in the drill hole, one end of the threaded steel (9) penetrates through the supporting steel pipe (8) and is firmly welded after being wedged with the bottom steel plate (13), and the other end of the threaded steel (9) penetrates through the top steel plate (5) and is fixedly connected with the top side of the block cutting box girder through a double-spliced channel steel (7) and a first steel plate (10);
The four ends of the block cutting box girder are provided with hanging point grooves (1), and steel wire ropes (3) penetrate through the four groups of hanging point grooves (1);
a bridge-dismantling steel pipe bracket (4) is arranged at the bottom side of the beam body (6) corresponding to the temporary reinforcing device;
The construction method of the device comprises the following steps:
step S1: before the girder body (6) is dismantled, the pier girder is temporarily solidified, gaps around the support are filled with cement mortar, a cutting section (2) is determined according to a dismantling principle of the main bridge body (6), and hanging point grooves (1) are arranged at four corners of the girder body (6) to be resected;
Step S2: vertical through drilling is carried out on the top side of the cavity of the block cutting beam box so as to pass through the lowering of the finish rolling deformed steel bar (9);
step S3: the drilling point position uses a laser centralizer to determine an anchoring point at the bottom side of the cavity of the block-cut beam box, a bottom steel plate 13 is placed, and bolts are used for anchoring;
Step S4: a top steel plate (5) is adhered to the top side of the cavity of the block cutting beam box corresponding to the position of the drilling hole, a deformed steel bar (9) is downwards put from the upper direction of the drilling hole, the contact part of the deformed steel bar (9) and a bottom steel plate (13) is wedged tightly and then welded firmly, and the top side is fixed by adopting a double-spliced channel steel (7) and a first steel plate (10) and a screw cap;
Step S5: the four corners of the bottom steel plate (13) and the top steel plate (5) are correspondingly provided with supporting steel pipes (8), the steel pipes are wedged and welded firmly, the inner side of the temporary reinforcing device is welded with a second steel plate (11) on the supporting steel pipes (8), diagonal bracing channel steel (12) is arranged, and the steel plates are welded at the second steel plate (11);
Step S6: drawing a line on the dismantled structure, marking a cutting block, drilling a working hole with the diameter of 100mm at the intersection point of the cutting line, cutting along the bridge direction, and cutting along the transverse bridge direction;
Step S7: after the whole body is cut off, a steel wire rope (3) passes through a hanging point slot (1) and is anchored at the beam bottom of a beam body (6), the beam body is lifted by a gantry crane according to a four-point crane to be 20cm high, the whole body stays for 5 to 10 minutes, the conditions of the periphery of the beam body (6) and the steel wire rope (3) are checked, and the whole body is regulated to a transport vehicle to be transported out of the site after confirming no errors;
Step S8: and after the beam body (6) is transported to a stacking place, the temporary reinforcing device is recovered to finish the dismantling.
2. The temporary support device in a concrete box girder bridge block dismantling hanging box according to claim 1, wherein:
The temporary reinforcing device is located right above the bridge-removing pipe pile and arranged on two sides of the cutting section (2).
3. The temporary support device in a concrete box girder bridge block dismantling hanging box according to claim 1, wherein:
the cutting section (2) is an inclined plane which is cut downwards along the bottom side of the top side of the beam body (6).
4. The temporary support device in a concrete box girder bridge block dismantling hanging box according to claim 1, wherein:
And mounting holes are formed in four ends of the top side of the bottom steel plate (13), and the bottom steel plate is fixed on the bottom side inside the cavity through bolts.
5. The temporary support device in a concrete box girder bridge block dismantling hanging box according to claim 1, wherein:
the diagonal bracing channel steel (12) is arranged in the cavity in a crossing mode, and two ends of the diagonal bracing channel steel are welded to two ends of the second steel plates (11) on two sides respectively.
6. The construction method for block dismantling of the concrete box girder bridge according to claim 1, wherein the construction method comprises the following steps:
the cutting line of the cutting section (2) in the step S1 is provided with an outward oblique angle of 2-3 degrees with the vertical line.
7. The construction method for block dismantling of the concrete box girder bridge according to claim 1, wherein the construction method comprises the following steps:
And step S1, slotting (1) the hanging point and cutting the beam Bian Juli to 1.5m.
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| CN202111249973.5A CN113882285B (en) | 2021-10-26 | 2021-10-26 | Temporary supporting device in concrete box girder bridge block dismantling hanging box and construction method |
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| CN202111249973.5A CN113882285B (en) | 2021-10-26 | 2021-10-26 | Temporary supporting device in concrete box girder bridge block dismantling hanging box and construction method |
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| CN216040754U (en) * | 2021-10-26 | 2022-03-15 | 中铁二十二局集团第三工程有限公司 | Temporary supporting device in concrete box girder bridge block dismantling hoisting box |
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| CN205152807U (en) * | 2015-11-25 | 2016-04-13 | 中铁二十局集团有限公司 | Downgoing movable formwork bridge construction machine is demolishd and is hoisted construction structures with girder |
| CN110172929A (en) * | 2019-06-18 | 2019-08-27 | 中交二公局第二工程有限公司 | A kind of concrete box beam flange plate cutting disassembling stabilising arrangement and cutting disassembling method |
| CN214087316U (en) * | 2020-12-24 | 2021-08-31 | 中铁大桥局武汉桥梁特种技术有限公司 | Be used for concrete box girder to demolish segment hoist device |
| CN113089510A (en) * | 2021-04-14 | 2021-07-09 | 四川省交通建设集团股份有限公司 | Method for dismantling reinforced concrete continuous box girder overpass bridge |
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| CN216040754U (en) * | 2021-10-26 | 2022-03-15 | 中铁二十二局集团第三工程有限公司 | Temporary supporting device in concrete box girder bridge block dismantling hoisting box |
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