CN109629425B - Cantilever support and construction method of concrete flange of steel-concrete combined bridge using cantilever support - Google Patents
Cantilever support and construction method of concrete flange of steel-concrete combined bridge using cantilever support Download PDFInfo
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- CN109629425B CN109629425B CN201811489002.6A CN201811489002A CN109629425B CN 109629425 B CN109629425 B CN 109629425B CN 201811489002 A CN201811489002 A CN 201811489002A CN 109629425 B CN109629425 B CN 109629425B
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- 238000010276 construction Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 186
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- 239000002131 composite material Substances 0.000 claims abstract description 36
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- 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
- E01D21/10—Cantilevered erection
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Abstract
The invention provides a detachable cantilever support and a construction method of a concrete flange of a steel-concrete composite bridge using the cantilever support. This cantilever support includes: the device comprises a steel bracket, a bolt, a round steel rod, a steel base plate and a rotary limiting device; the steel bracket is in the shape of an obtuse triangle, and a connecting plate is arranged at the obtuse end of the steel bracket; the acute angle end is provided with a steel sleeve; one end of the round steel rod is fixedly connected with the steel backing plate, and the other end of the round steel rod penetrates through the steel sleeve; the steel base plate is abutted with a steel beam web plate; the rotary limiting device comprises a first limiting stopper and a second limiting stopper; internal threads corresponding to the external threads on the round steel rod are arranged in the first limiting stopper and the second limiting stopper; the first limiting stopper and the second limiting stopper are sleeved on the round steel rod through external threads and internal threads and are respectively positioned at two ends of the steel sleeve, and the steel sleeve is fixed on the round steel rod. The invention can realize the quick installation and disassembly of the cantilever support, improve the construction speed, save the use cost and have no damage to the structure.
Description
Technical Field
The application relates to the technical field of building structures, in particular to a cantilever support for construction of a concrete flange of a steel-concrete composite bridge and a construction method of the concrete flange of the steel-concrete composite bridge using the cantilever support.
Background
The steel-concrete combined bridge is a bridge structure form which connects a steel beam and a concrete bridge deck into a whole through a shear connector and considers common stress. Compared with a steel structure bridge, the combined bridge has the advantages of small steel consumption, large rigidity, good compression stability and the like, and compared with a concrete bridge, the combined bridge has the advantages of low structure height, small self weight, large applicable span, high ductility and the like. In addition, the combined beam bridge adopts reasonable manufacturing and construction procedures, is convenient for industrial production, and has high field installation quality, low construction cost and high construction speed.
Composite bridges have found a great deal of use in our country. When the steel-concrete combined bridge is constructed, the pouring of the concrete flange plate plays a role in controlling the construction period. Through a composite slab bridge deck technology (Nie Ming, Liuming, Ye Lianping. Steel-concrete composite structure [ M ]. Chinese building industry Press, 2005), the concrete bridge deck is partially prefabricated into composite slabs which are used as templates in concrete pouring, and after post-cast concrete is solidified, the composite slabs and the concrete form a whole to bear force together, so that the problem of template erection of the full cast-in-place concrete bridge deck is solved, and the construction speed is greatly improved.
However, in the existing concrete bridge deck cantilever flange part, a cantilever support formwork supporting method is needed in the pouring process, the cantilever support is mostly installed by welding, bolts, connecting plates and the like need to be cut when the cantilever support is disassembled, the structure is easy to damage, the structure is attractive, and the construction speed is slow.
Disclosure of Invention
In view of the above, the invention provides a cantilever support and a construction method of a concrete flange of a steel-concrete composite bridge using the cantilever support, so that the cantilever support can be quickly mounted and dismounted, the construction speed is improved, the use cost is saved, and the structure is not damaged.
The technical scheme of the invention is realized as follows:
a removable outrigger for a concrete flange construction of a steel-concrete composite bridge, the removable outrigger comprising: the device comprises a steel bracket, a bolt, a round steel rod, a steel base plate and a rotary limiting device;
the steel bracket is in an obtuse triangle shape; the obtuse angle end of the steel bracket is provided with a connecting plate; the connecting plate is provided with a bolt hole for a bolt to pass through;
one acute angle end of the steel bracket is provided with a steel sleeve;
one end of the round steel rod is fixedly connected with the steel backing plate; the steel base plate is abutted with a steel beam web plate; the other end of the round steel rod penetrates through the steel sleeve; the round steel rod is provided with an external thread;
the rotary limiting device comprises a first limiting stopper and a second limiting stopper; the first limiting stopper and the second limiting stopper are internally provided with internal threads corresponding to the external threads on the round steel rod;
the first limiting stopper and the second limiting stopper are sleeved on the round steel rod through the external threads and the internal threads and are respectively positioned at two ends of the steel sleeve, and the steel sleeve is fixed on the round steel rod.
Preferably, the bolt is a detachable hexagon bolt.
Preferably, the steel sleeve and the steel bracket are integrally formed.
Preferably, the steel bracket is formed by welding profile steel or round steel tubes.
Preferably, the removable outrigger further comprises: a gasket;
the washer is disposed between the bolt and the bottom of the overhanging portion of the flange on the steel beam.
The invention also provides a construction method of the concrete flange of the steel-concrete combined bridge using the cantilever support, which comprises the following steps:
selecting a required cantilever bracket according to requirements;
determining the size and the number of the bolts according to the stress size of the selected cantilever support and the thickness of the upper flange of the steel beam;
a threaded hole is formed in the upper flange extension part of the steel beam of the concrete flange of the steel-concrete composite bridge;
the bolts penetrate through the threaded holes in the connecting plate and the threaded holes in the upper flange of the steel beam, the top of the cantilever support is fixed to the bottom of the upper flange of the steel beam, the position of the round steel rod is adjusted through the rotary limiting device, the steel base plate is tightly propped against a steel beam web plate below the overhanging part of the upper flange of the steel beam, and the steel sleeve is fixed on the round steel rod;
installing a cushion block and a template for pouring on the cantilever support; if the prefabricated composite slab is the composite slab, continuously installing the prefabricated composite slab;
pouring the cantilever part of the concrete bridge deck;
after the concrete is solidified, screwing out the bolt, and taking down the cantilever support;
and performing later-stage protection measures at the threaded hole on the upper flange of the steel beam.
As can be seen from the above, in the detachable cantilever support for the concrete flange construction of the steel-concrete composite bridge according to the present invention, since the detachable bolt and the contact-type steel support are used as a connection and fixation manner, the top of the cantilever support is fixed by the bolt, and the steel pad plate at the lower portion is only abutted against the steel beam web and is not fixedly connected with the steel beam web, rapid installation can be achieved by the bolt fixation at the upper portion and the positioning of the rotation limiting device at the lower portion, welding is not required during the installation process, and the bolting workload is small; and after concrete pouring is accomplished, only need with the bolt directly unscrew can, the flow that needs the cutting when having avoided traditional cantilever to dismantle can realize dismantling fast to can improve the construction speed greatly. In addition, after the whole cantilever support is disassembled, all components of the cantilever support can be reused, so that the use cost can be effectively saved, and the economic benefit is improved. In addition, the whole disassembly and assembly process of the cantilever support does not need welding or cutting, and the structure is not damaged, so that the influence on the original structure is small, the influence on the surrounding environment is small, the cantilever support is convenient and attractive, and the requirement of green construction is met. In addition, the cantilever support has the advantages of definite stress, clear force transmission path, reliable force transmission and convenient calculation and design, and can be applied to a combined structure with any section form of the steel beam overhanging flange.
Drawings
Fig. 1 is a schematic use diagram of a detachable cantilever support for concrete flange construction of a steel-concrete composite bridge in an embodiment of the invention (the cantilever flange is cast in situ completely).
Fig. 2 is a schematic use diagram of the detachable cantilever support for the concrete flange construction of the steel-concrete composite bridge in the embodiment of the invention (the cantilever flange is made of laminated plates and is partially cast in situ).
Fig. 3 is a side view of a detachable cantilever support for concrete flange construction of a steel-concrete composite bridge according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a steel bracket in an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a round steel rod, a steel backing plate and a rotation limiting device in the embodiment of the invention.
Fig. 6 is a force diagram of the detachable cantilever support for the concrete flange construction of the steel-concrete composite bridge in the embodiment of the invention.
Fig. 7 is a schematic flow chart of a construction method of a concrete flange of a steel-concrete composite bridge in the embodiment of the invention.
Detailed Description
In order to make the technical scheme and advantages of the invention more apparent, the invention is further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 5, the detachable cantilever bracket for the concrete flange construction of a steel-concrete composite bridge according to an embodiment of the present invention includes: the device comprises a steel bracket 11, a bolt 12, a round steel rod 13, a steel backing plate 14 and a rotation limiting device 15;
the steel bracket 11 is in an obtuse triangle shape; a connecting plate 16 is arranged at the obtuse angle end of the steel bracket 11; the connecting plate 16 is provided with a bolt hole 17 for the bolt 12 to pass through;
a steel sleeve 18 is arranged at one acute angle end of the steel bracket 11;
one end of the round steel rod 13 is fixedly connected with the steel backing plate 14; the steel base plate 14 is abutted with the steel beam web 10; the other end of the round steel rod 13 penetrates through the steel sleeve 18; the round steel rod 13 is provided with an external thread 31;
the rotation limiting device 15 comprises a first limiting stopper 51 and a second limiting stopper 52; the first stopper 51 and the second stopper 52 are provided with internal threads 53 corresponding to the external threads 31 on the round steel rod 13;
the first stopper 51 and the second stopper 52 are sleeved on the round steel rod 13 through the external thread 31 and the internal thread 53, and are respectively positioned at two ends of the steel sleeve 18, so that the steel sleeve 18 is fixed on the round steel rod 13.
When the cantilever support is used, a threaded hole 20 is firstly formed in the upper flange overhanging part of the steel beam of the concrete flange of the steel-concrete composite bridge, then the threaded hole 20 is aligned with the threaded hole 17 in the connecting plate 16 at the obtuse-angle end of the steel support, then the bolt 12 respectively passes through the threaded hole 17 and the threaded hole 20 and is screwed by a tool, and thus the top of the cantilever support is fixed at the bottom of the upper flange overhanging part of the steel beam. Then, the position of the round steel rod is adjusted by rotating the first limiting stopper and the second limiting stopper, so that the steel base plate is tightly propped against a steel beam web plate below the overhanging part of the upper flange of the steel beam; and after the position is adjusted, screwing the first limiting stopper and the second limiting stopper, and fixing the steel sleeve on the round steel rod.
In addition, preferably, in an embodiment of the present invention, the bolt is a detachable hexagon bolt.
In addition, preferably, in an embodiment of the present invention, the steel sleeve and the steel bracket are integrally formed. Of course, in another embodiment, the steel sleeve may be welded directly to the acute end of the steel bracket.
In addition, preferably, in an embodiment of the present invention, the steel bracket is welded by using a steel section or a round steel tube.
In addition, preferably, in an embodiment of the present invention, the cantilever support further includes: a gasket 19; the washer 19 is located between the bolt 12 and the bottom of the overhanging portion of the flange on the steel beam.
According to the technical scheme, the top of the cantilever support is fixed with the overhanging part of the upper flange of the steel beam through bolts, so that vertical and lateral supporting force is provided for the steel support, and the steel base plate at the lower part of the cantilever support is abutted against the web plate of the steel beam so as to provide lateral supporting force for the cantilever support. Therefore, the weight of the wet concrete of the cantilever is shared by the bolts fixed at the upper flange of the steel beam, the steel backing plate supported on the web plate of the steel beam and the round steel rod.
In addition, the steel bracket of the cantilever bracket is in the shape of an obtuse triangle, so that the lower end of the steel bracket is closer to the direction of a steel beam web, the supporting length of the round steel rod can be shortened, and the compression stability of the round steel rod is improved.
Because the top of the cantilever support is fixed through the bolts, and the steel base plate at the lower part is only abutted against the steel beam web and is not fixedly connected with the steel beam web, the cantilever support can be quickly installed by fixing the bolts at the upper part and positioning the rotary limiting device at the lower part, welding is not needed in the installation process, and the bolting workload is small; and after concrete pouring is accomplished, only need with the bolt directly unscrew can, the flow that needs the cutting when having avoided traditional cantilever to dismantle can realize dismantling fast to can improve the construction speed greatly. In addition, all parts of the whole cantilever support can be repeatedly used after being disassembled, so that the use cost can be effectively saved, and the economic benefit is improved. In addition, the whole disassembly and assembly process of the cantilever support is free of welding and cutting, so that the influence on the original structure is small, the influence on the surrounding environment is small, and the requirement of green construction is met. In addition, the cantilever support is definite in stress, clear in force transmission path, reliable in force transmission and convenient to calculate and design.
Fig. 6 is a force diagram of the detachable cantilever support for the concrete flange construction of the steel-concrete composite bridge in the embodiment of the invention. It can be assumed that a plurality of the cantilever brackets are arranged on the overhanging part of the upper flange of the steel beam, the length of the overhanging part of the upper flange of the steel beam is 1.5m, the thickness is uniformly 0.3m, the distance D between two adjacent cantilever brackets is 2.0m, the height H of each cantilever bracket is 0.5m, the steel beam is made of Q345 steel, the thickness of the upper flange is 20mm, and the volume weight of concrete is 25kN/m3, so that the following steps are provided:
the resultant force of gravity acting on the cantilever support G is 1.5 × 0.3 × 2.0 × 25 is 22.5 kN;
vertical force F applied to bolt1y＝G＝22.5kN；
The distance L between the gravity action point of the wet concrete and the bolt is 0.75 m;
horizontal force F applied to bolt1x＝F2＝GL/H＝33.8kN。
Wherein, F2The lateral supporting force is provided for the round steel rod.
If the thickness of the upper flange of the steel beam is 20mm, the maximum thickness of the threaded hole is 20mm, and the material property of the threaded hole is calculated according to Q345. The load is small, the common bolt M24 can be adopted, Q345 is made of a material, the common nut is made of a 4.6 material, the tensile bearing capacity of the common nut is 79.4kN (GBT 3098.1-2000 fastener mechanical performance bolt, screw and stud), and the shearing resisting bearing capacity of the common nut is ensured to be load:
225/31/2×π×122/1000＝58.8kN，
the thickness of the nut of the M24 bolt is 21.5mm (GB/T6170-2000 hexagon nut), the bearing capacity is reduced according to the condition that 20/21.5 is 93.0 percent, the guaranteed load after reduction is 73.8kN and 54.7kN, and 22.5/73.8+33.8/54.7 is 0.92<1.0, so that the design requirement is met. In the technical scheme of the invention, the size of the steel bracket is adopted according to a common structure, so that the requirement can be met. If a large bracket spacing (e.g., 5m) is used, the number of bolts on top can be increased (e.g., 2 bolts are used) to meet design requirements.
In addition, the technical scheme of the invention also provides a construction method of the concrete flange of the steel-concrete combined bridge using the cantilever support.
Fig. 7 is a schematic flow chart of a construction method of a concrete flange of a steel-concrete composite bridge in the embodiment of the invention. As shown in fig. 7, in the technical solution of the present invention, the construction method of the concrete flange of the steel-concrete composite bridge includes the following steps:
and step 71, selecting the required cantilever support according to requirements.
In the technical scheme of the invention, the size and the spacing of the cantilever supports required to be used can be selected according to the specific requirements of actual engineering. The required cantilever support can be directly manufactured according to the requirement, and the existing cantilever support which can be directly used can also be used.
And step 72, determining the size and the number of the bolts according to the stress size of the selected cantilever support and the thickness of the upper flange of the steel beam.
In the technical scheme of the invention, under the general condition, a common bolt is adopted.
In addition, according to the force receiving diagram shown in fig. 6, the following formula holds:
G＝F1y，F1x＝F2，GL＝F1xH；
therefore, in a preferred embodiment of the present invention, the size and number of bolts used can also be determined according to the above formula.
And 73, forming threaded holes in the upper flange extension parts of the steel beams of the concrete flanges of the steel-concrete composite bridge.
According to the technical scheme, a proper position (for example, a corresponding construction operation space is formed, the construction operation space does not interfere with other structural parts and the like) can be selected on the flange extending part on the steel beam according to the practical application scene of the project (for example, whether the structure is cast-in-place completely or partially, and the like), and then the threaded hole is formed in the flange on the steel beam at the selected position. Generally, the through threaded holes can be formed along the full thickness of the upper flange of the steel beam.
And step 74, penetrating bolts through threaded holes in the connecting plate and threaded holes in the upper flange of the steel beam, fixing the top of the cantilever support to the bottom of the upper flange of the steel beam, adjusting the position of the round steel rod through the rotary limiting device, enabling the steel base plate to be tightly propped against a steel beam web plate below the overhanging part of the upper flange of the steel beam, and fixing the steel sleeve on the round steel rod.
In the technical scheme of the invention, the threaded hole 20 and the threaded hole 17 can be aligned, then bolts respectively pass through the threaded hole 17 and the threaded hole 20 and are screwed down by a tool, so that the top of the cantilever support is fixed at the bottom of the overhanging part of the upper flange of the steel beam; then, rotating the first limiting stopper and the second limiting stopper, and adjusting the position of the round steel rod to enable the steel base plate to be tightly propped against a steel beam web plate below the overhanging part of the upper flange of the steel beam; and after the position is adjusted, screwing the first limiting stopper and the second limiting stopper, and fixing the steel sleeve on the round steel rod.
And 76, pouring the cantilever part of the concrete bridge deck slab.
And 77, after the concrete is solidified, screwing out the bolt and taking down the cantilever support.
And step 78, performing later protection measures on the threaded hole in the flange of the steel beam.
For example, in a preferred embodiment of the present invention, post-coating or the like can be applied to the threaded holes on the flanges of the steel beam.
The construction of the concrete flange of the steel-concrete composite bridge can be completed through the steps 71-78.
In summary, in the technical solution of the present invention, the cantilever support uses the detachable bolt and the contact-type steel support as a connection and fixation manner, the top of the cantilever support is fixed by the bolt, and the lower steel pad plate is only abutted against the steel beam web and is not fixedly connected with the steel beam web, so that the cantilever support can be quickly installed by fixing the upper bolt and positioning the lower rotation limiting device, and the cantilever support does not need to be welded during installation and has small bolting workload; and after concrete pouring is accomplished, only need with the bolt directly unscrew can, the flow that needs the cutting when having avoided traditional cantilever to dismantle can realize dismantling fast to can improve the construction speed greatly. In addition, after the whole cantilever support is disassembled, all components of the cantilever support can be reused, so that the use cost can be effectively saved, and the economic benefit is improved. In addition, the whole disassembly and assembly process of the cantilever support does not need welding or cutting, and the structure is not damaged, so that the influence on the original structure is small, the influence on the surrounding environment is small, the cantilever support is convenient and attractive, and the requirement of green construction is met. In addition, the cantilever support has the advantages of definite stress, clear force transmission path, reliable force transmission and convenient calculation and design, and can be applied to a combined structure with any section form of the steel beam overhanging flange.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A removable cantilever support for concrete flange construction of a steel-concrete composite bridge, the removable cantilever support comprising: the device comprises a steel bracket, a bolt, a round steel rod, a steel base plate and a rotary limiting device;
the steel bracket is in an obtuse triangle shape; the obtuse angle end of the steel bracket is provided with a connecting plate; the connecting plate is provided with a bolt hole for a bolt to pass through;
one acute angle end of the steel bracket is provided with a steel sleeve;
one end of the round steel rod is fixedly connected with the steel backing plate; the steel base plate is abutted with a steel beam web plate; the other end of the round steel rod penetrates through the steel sleeve; the round steel rod is provided with an external thread;
the rotary limiting device comprises a first limiting stopper and a second limiting stopper; the first limiting stopper and the second limiting stopper are internally provided with internal threads corresponding to the external threads on the round steel rod;
the first limiting stopper and the second limiting stopper are sleeved on the round steel rod through the external threads and the internal threads and are respectively positioned at two ends of the steel sleeve, and the steel sleeve is fixed on the round steel rod.
2. The removable outrigger of claim 1, wherein:
the bolt is a detachable hexagon bolt.
3. The removable outrigger of claim 1, wherein:
the steel sleeve and the steel bracket are integrally formed.
4. The removable outrigger of claim 1, wherein:
the steel bracket is formed by welding profile steel or round steel tubes.
5. The removable outrigger of claim 1, further comprising: a gasket;
the washer is disposed between the bolt and the bottom of the overhanging portion of the flange on the steel beam.
6. A method of constructing a concrete flange of a steel-concrete composite bridge using the outriggers of claims 1 to 5, wherein the method comprises the steps of:
selecting a required cantilever bracket according to requirements;
determining the size and the number of the bolts according to the stress size of the selected cantilever support and the thickness of the upper flange of the steel beam;
a threaded hole is formed in the upper flange extension part of the steel beam of the concrete flange of the steel-concrete composite bridge;
the bolts penetrate through the threaded holes in the connecting plate and the threaded holes in the upper flange of the steel beam, the top of the cantilever support is fixed to the bottom of the upper flange of the steel beam, the position of the round steel rod is adjusted through the rotary limiting device, the steel base plate is tightly propped against a steel beam web plate below the overhanging part of the upper flange of the steel beam, and the steel sleeve is fixed on the round steel rod;
installing a cushion block and a template for pouring on the cantilever support; if the prefabricated composite slab is the composite slab, continuously installing the prefabricated composite slab;
pouring the cantilever part of the concrete bridge deck;
after the concrete is solidified, screwing out the bolt, and taking down the cantilever support;
and performing later-stage protection measures at the threaded hole on the upper flange of the steel beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811489002.6A CN109629425B (en) | 2018-12-06 | 2018-12-06 | Cantilever support and construction method of concrete flange of steel-concrete combined bridge using cantilever support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811489002.6A CN109629425B (en) | 2018-12-06 | 2018-12-06 | Cantilever support and construction method of concrete flange of steel-concrete combined bridge using cantilever support |
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| Publication Number | Publication Date |
|---|---|
| CN109629425A CN109629425A (en) | 2019-04-16 |
| CN109629425B true CN109629425B (en) | 2020-04-10 |
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| JP5020163B2 (en) * | 2008-05-29 | 2012-09-05 | 日鐵住金建材株式会社 | Support for overhanging slab |
| CN201406639Y (en) * | 2009-05-20 | 2010-02-17 | 北京城乡建设集团有限责任公司 | Support of construction formworks of side flange plate of concrete-steel beam |
| CN103388310A (en) * | 2013-08-09 | 2013-11-13 | 北京市公路桥梁建设集团有限公司 | Single-point fixing adjustable cantilever tripod |
| CN108193599A (en) * | 2017-12-28 | 2018-06-22 | 中铁十局集团第四工程有限公司 | Concrete-steel Beam cast-in-place flange plate cantilevered support structure system and construction method |
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