CN112411383A - Large cantilever concrete bent cap few-embedded-part assembled bracket and construction method thereof - Google Patents
Large cantilever concrete bent cap few-embedded-part assembled bracket and construction method thereof Download PDFInfo
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- CN112411383A CN112411383A CN202011250919.8A CN202011250919A CN112411383A CN 112411383 A CN112411383 A CN 112411383A CN 202011250919 A CN202011250919 A CN 202011250919A CN 112411383 A CN112411383 A CN 112411383A
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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Abstract
The invention relates to a large cantilever concrete bent cap few embedded part assembled bracket and a construction method thereof, comprising the following steps: step S1, reserving a through steel bar hole, and filling sand into the PVC pipe and sealing the PVC pipe when pouring the pier stud; s2, constructing a through steel bar, and penetrating the through steel bar into a reserved hole after the concrete reaches the designed strength; mounting a triangular bracket on the lower edge of the cantilever beam; mounting an upper-layer section steel bracket on the lower edge of the cantilever beam; step S3, mounting the overhanging scaffold; mounting a bottom die; binding steel bars; installing counter-pulling finish-rolled deformed steel bars, wherein the finish-rolled deformed steel bars connect counter-pulling rods of counter-pulling templates of two pier studs in the door-shaped bracket; s4, casting the vase section concrete; capping beam reinforcing steel bar, concrete construction and prestress construction; adjusting the screw top, and dismantling the brackets in layers. Its advantages are: the defect of overlarge deflection deformation of the end of the cantilever end support in the traditional construction method is overcome, the purposes of accelerating the progress and saving materials are achieved, and the construction difficulty and period are reduced.
Description
Technical Field
The invention relates to the technical field of concrete cover beams, in particular to a large cantilever concrete cover beam few-embedded-part assembled bracket and a construction method thereof.
Background
With the development of national economy and bridge technology, in order to reduce the interference to road traffic and the life and environment of surrounding residents to the maximum extent, the construction technology of assembled bridges, which aims at 'factory production, assembly, informatization, greening and rapidness', is gradually researched, developed, popularized and applied in the field of bridge design and construction.
Wherein, traditional concrete bent cap has following defect and not enough:
the cover beam has long cantilever, the underground is influenced by traffic or river channels, the full floor type support cast-in-place construction cannot be adopted, the deflection deformation of the end of the cantilever end support is overlarge in the traditional construction method, large-scale mechanical hoisting equipment is needed, and the construction difficulty and period are increased.
Chinese patent document CN201410318409.8, application date 20140707, with patent names: a system and a method for a segmental assembled concrete framed pier with self-resetting capability disclose a system and a construction method for a segmental assembled concrete framed pier with self-resetting capability, wherein one end of a longitudinal steel bar penetrates through a concrete pier and a steel bar corrugated pipe in a precast concrete cover beam to be fixedly connected with the precast concrete cover beam, high-strength mortar is poured into the steel bar corrugated pipe, and the other end of the longitudinal steel bar penetrates through the concrete pier and is fixedly connected with pier head steel bars on a platform at the bottom surface of a cup opening of a concrete bearing platform; the prestressed steel strand penetrates through the concrete bearing platform, the two concrete piers and the prestressed steel corrugated pipe of the precast concrete capping beam, two ends of the prestressed steel corrugated pipe are fixedly connected with the precast concrete capping beam respectively, and concrete is poured in the cup mouth of the concrete bearing platform. Under the action of earthquake load, the reinforcing steel bar can be ensured to have enough holding length to effectively transfer force.
The segment-assembled concrete frame bridge pier system and the segment-assembled concrete frame bridge pier method with the self-resetting capability disclosed by the patent document can be suitable for various foundation types, and the seismic performance of the system is better than that of the traditional cast-in-place reinforced concrete pier and the aim of rapid construction is fulfilled. However, a technical scheme which can overcome the defect of excessive deflection deformation of the end of the cantilever end bracket in the traditional construction method and improve the construction efficiency is not disclosed correspondingly.
In conclusion, the large cantilever concrete capping beam few-embedded-part assembled bracket and the construction method thereof, which can overcome the defect of overlarge deflection deformation of the end of the cantilever end support in the traditional construction method and improve the construction efficiency, are urgently needed. However, the large cantilever concrete capping beam few-embedded-part assembled bracket and the construction method thereof are not reported at present.
Disclosure of Invention
The invention aims to provide a construction method of a large cantilever concrete bent cap few-embedded-part assembled bracket, which can overcome the defect of overlarge deflection deformation of the end of a cantilever end support in the traditional construction method and improve the construction efficiency aiming at the defects in the prior art.
It is a further object of the present invention to provide a large cantilever concrete cap beam low embedment fabricated bracket which improves construction efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that:
the construction method of the large cantilever concrete bent cap few-embedded-part assembled bracket comprises the following steps:
step S1, reserving a through steel bar hole, filling sand into the PVC pipe and sealing the PVC pipe when pouring the pier stud, and embedding concrete in advance along the transverse bridge direction;
s2, constructing a through steel bar, and penetrating the through steel bar into a reserved hole after the concrete reaches the designed strength; mounting a triangular bracket at the lower edge of the cantilever beam, wherein the triangular bracket is integrally hoisted after being assembled in blocks on site; mounting an upper-layer section steel bracket on the lower edge of the cantilever beam, wherein the upper-layer section steel bracket is hoisted in three layers after being assembled in blocks on site;
step S3, mounting the overhanging scaffold; mounting a bottom die; binding steel bars; the counter-pulling finish-rolling deformed steel bars are installed, the reinforcing templates are counter-pulled, and then the counter-pulling rods of the counter-pulling templates of the two pier columns are connected inside the door-shaped support through the connectors and the finish-rolling deformed steel bars with corresponding lengths, so that the support camber at two sides is balanced;
s4, casting the vase section concrete; capping beam reinforcing steel bar, concrete construction and prestress construction; adjusting the screw top, and dismantling the brackets in layers.
As a preferred solution, there is one and only one steel bar passing through the triangular bracket.
As a preferred technical scheme, the upper-layer section steel bracket is horizontally layered into three layers, and specifically comprises an upper-layer bracket first layer, an upper-layer bracket second layer and an upper-layer bracket third layer.
In a preferred embodiment, in step S3, after the finish-rolled deformed bars are installed, the brackets on both sides are made to have the same camber force by balanced pouring of concrete on both sides, and the camber is slightly deformed to generate a counter-tension force in the finish-rolled deformed bars.
In order to achieve the second object, the invention adopts the technical scheme that:
the large cantilever concrete bent cap few embedded part assembled bracket is characterized in that the bracket comprises a pier stud; a cantilever beam is arranged on the pier stud; the lower edges of the two ends of the pier column of the cantilever beam are provided with triangular brackets; the cantilever beam is provided with upper-layer section steel brackets on the upper edges of two ends of the pier stud; the upper bracket comprises an upper bracket first layer, an upper bracket second layer and an upper bracket third layer; the number of the upper-layer brackets is two, and counter-drawing finish-rolling deformed steel bars are connected between the two upper-layer bracket supports; the pier stud is also provided with a through steel bar.
As a preferable technical scheme, the internal structure of the upper-layer section steel bracket is in a triangular block form, and the triangular blocks are connected in an assembling mode through high-strength bolts.
As a preferred technical scheme, the number of the pier columns is two, and a counter-pull rod is connected between the two pier columns.
The invention has the advantages that:
1. the large cantilever concrete bent cap few-embedded-part assembled bracket and the construction method thereof overcome the defect of overlarge deflection deformation of the end of a cantilever end support in the traditional construction method, achieve the purpose of accelerating the progress and saving materials, do not need large-scale mechanical hoisting equipment, increase the safety coefficient of the construction of the same type of structure, reduce the construction difficulty and period, reduce the traffic pressure below the structure, and have good social benefit and economic benefit.
2. Through setting up upper strata type bracket at the top edge of cantilever beam, through upper strata type bracket with the cantilever section of cantilever beam to the stress dispersion to the pier shaft of stiff end, concrete atress principle as follows: the construction load forms downward integral bending moment taking the steel bar as a pivot, the counter pull rod and the pier stud between the pier studs resist the horizontal force reverse force at the bottom of the lower triangular bracket to serve as balance bending moment, and meanwhile, the steel bar bears vertical load, so that integral stress balance is achieved.
3. Form a great triangle bracket between triangle bracket and the cantilever beam for the cantilever beam becomes triangle bearing diagonal, becomes vertical pressurized with steel construction cantilever bending, has greatly reduced end amount of deflection deformation. And the traditional cantilever beam type bracket has larger deflection of the cantilever end and is not suitable for the construction of a large cantilever capping beam.
Drawings
FIG. 1 is a structural block diagram of a large cantilever concrete bent cap few embedded part assembly type bracket construction method.
FIG. 2 is a schematic structural diagram of a large cantilever concrete bent cap few embedded part assembled bracket of the invention.
Detailed Description
The following detailed description of the present invention will be made with reference to the accompanying drawings.
The reference numerals and components referred to in the drawings are as follows:
1. piercing rod 2. opposite-drawing-diameter-rolling deformed steel bar
3. Triangular bracket 4. first layer of upper bracket
5. Second layer of upper bracket 6. third layer of upper bracket
7. Adjusting screw top
Referring to fig. 1, fig. 1 is a structural block diagram of a large cantilever concrete capping beam few embedded part assembly type bracket construction method of the present invention. A large cantilever concrete bent cap few embedded part assembly type bracket construction method; the construction method of the assembled bracket comprises the following steps:
step S1, reserving holes of the penetrating steel bar 1, filling sand into the PVC pipes and sealing the PVC pipes when pouring the pier stud, and embedding concrete in advance along the transverse bridge direction; the PVC pipe ensures deformation, prevents the reserved hole from being collapsed, seals two ends, prevents the reserved hole from being blocked and keeps a hollow state.
S2, constructing the core penetrating steel bar 1, and penetrating the core penetrating steel bar 1 into a reserved hole after the concrete reaches the design strength; mounting a triangular bracket 3 on the lower edge of the cantilever beam, wherein the triangular bracket 3 is integrally hoisted after being assembled in blocks on site; mounting an upper-layer section steel bracket on the lower edge of the cantilever beam, wherein the upper-layer section steel bracket is hoisted in three layers after being assembled in blocks on site; wherein, the both ends at the cantilever beam are installed to triangular bracket 3, like this, form a great triangle bracket between triangular bracket 3 and the cantilever beam for the cantilever beam becomes triangle bearing diagonal, becomes vertical pressurized with steel construction cantilever bending, has greatly reduced the end amount of deflection and has warp. And the traditional cantilever beam type bracket has larger deflection of the cantilever end and is not suitable for the construction of a large cantilever capping beam.
Secondly, set up upper strata type bracket through the top edge at the cantilever beam, through upper strata type bracket with the cantilever section of cantilever beam to the stress dispersion to the pier shaft of stiff end, concrete atress principle as follows: the construction load forms downward integral bending moment taking the steel bar as a pivot, the counter pull rod and the pier stud between the pier studs are used for resisting the reverse force of the horizontal force at the bottom of the lower triangular bracket 3 to serve as balance bending moment, and meanwhile, the steel bar bears vertical load, so that integral stress balance is achieved.
In addition, the upper layer bracket and the triangular bracket 3 are assembled on site and then hoisted, so that the disassembly, assembly and transportation are convenient, meanwhile, the operation is convenient by adopting the on-site assembly,
moreover, the upper-layer steel bracket is hoisted by three layers after being assembled in blocks on site, and the triangular bracket 3 forms a four-layer structure altogether, so that the four-layer bracket building block type stacking and disassembling construction can be completed on site only, the assembly type construction effect is achieved, and no material loss exists in the construction process.
Step S3, mounting the overhanging scaffold; mounting a bottom die; binding steel bars; the counter-pulling finish-rolling deformed steel bar 2 is installed, the reinforcing templates are counter-pulled, and then the counter-pulling rods of the counter-pulling templates of the two pier columns are connected inside the door-shaped bracket by adopting the connectors and the finish-rolling deformed steel bars with corresponding lengths, so that the outward inclination of the brackets at two sides is balanced; the specific stress principle is as follows: the full-length finish-rolled deformed steel bar does not need to be prestressed after being installed, the supports on the two sides can be reversely outwards inclined when the vase section and the cover beam are cast by concrete, the outwards inclined forces of the supports on the two sides are the same through balanced casting of the concrete on the two sides, and the outward inclined slight deformation enables the finish-rolled deformed steel bar to generate opposite tension, so that the stress and deformation balance is achieved within an allowable deformation range.
S4, casting the vase section concrete; capping beam reinforcing steel bar, concrete construction and prestress construction; adjusting the screw top 7, and dismantling the brackets in layers.
The embodiment needs to be explained as follows:
the triangular bracket 3 is provided with only one through steel bar 1. The effect of this design is: the triangular bracket 3 only uses a piercing steel bar 1 as a stress fulcrum, and has no loss when being recycled. And two pivot points are pre-buried in the traditional triangular bracket, so that the loss is large.
The upper-layer section steel bracket is horizontally layered into three layers, and specifically comprises an upper-layer bracket first layer 4, an upper-layer bracket second layer 5 and an upper-layer bracket third layer 6. The effect of this design is: the layer-by-layer design is beneficial to installation and removal construction, so that the assembly realizes layering and has good mechanical property.
After the finish-rolled deformed steel bar is installed, the outward-inclining forces of the brackets on the two sides are the same through the balanced pouring of the concrete on the two sides, and the outward-inclining slight deformation enables the finish-rolled deformed steel bar to generate a counter-pulling force. The effect of this design is: the supports on the two sides of the pier stud are oppositely pulled through by adopting full-length finish-rolled deformed steel bars, and partial outward tilting forces are mutually offset.
Example 2
Referring to fig. 2, fig. 2 is a schematic structural view of the large cantilever concrete capping beam few embedded part assembly type bracket of the present invention. The large cantilever concrete bent cap is provided with a small number of embedded parts; the bracket comprises a pier stud; a cantilever beam is arranged on the pier stud; the cantilever beam is provided with a triangular bracket 3 at the lower edges of the two ends of the pier column; the cantilever beam is provided with upper-layer section steel brackets on the upper edges of two ends of the pier stud; the upper bracket comprises an upper bracket first layer 4, an upper bracket second layer 5 and an upper bracket third layer 6; the number of the upper-layer brackets is two, and a counter-pulling finish-rolling deformed steel bar 2 is connected between the two upper-layer bracket supports; the pier stud is also provided with a through steel bar 1.
The inner structure of the upper-layer section steel bracket is in a triangular block form, and the triangular blocks are connected in an assembling mode through high-strength bolts.
The number of the pier columns is two, and a counter pull rod is connected between the two pier columns.
The embodiment needs to be explained as follows:
the upper bracket adopts a layered structure design, so that the single hoisting weight is reduced, the high-altitude operation is reduced by layered modular assembly, only vertical bolt connection needs to be completed between layers, and the risk exposure time is reduced.
The upper layer bracket and the triangular bracket 3 are constructed in an assembly mode, so that labor input is reduced, construction efficiency is improved, and construction period is shortened; meanwhile, the ground position is not occupied, and the whole system is completely arranged on the pier stud, so that the environment is not affected basically.
The triangular bracket 3 is provided with and only passes through one penetrating steel bar 1, wherein the penetrating steel bar 1 is used as a stress fulcrum, and no loss is caused during recycling.
The structural effects of the other components of the bracket in this embodiment have already been described in embodiment 1, and will not be described again here.
The large cantilever concrete bent cap few-embedded-part assembled bracket and the construction method thereof overcome the defect of overlarge deflection deformation of the end of a cantilever end support in the traditional construction method, achieve the purpose of accelerating the progress and saving materials, do not need large-scale mechanical hoisting equipment, increase the safety coefficient of the construction of the same type of structure, reduce the construction difficulty and period, reduce the traffic pressure below the structure, and have good social benefit and economic benefit.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and additions can be made without departing from the method of the present invention, and these modifications and additions should also be regarded as the protection scope of the present invention.
Claims (7)
1. The construction method of the large cantilever concrete bent cap few-embedded-part assembled bracket is characterized by comprising the following steps:
step S1, reserving a through steel bar hole, filling sand into the PVC pipe and sealing the PVC pipe when pouring the pier stud, and embedding concrete in advance along the transverse bridge direction;
s2, constructing a through steel bar, and penetrating the through steel bar into a reserved hole after the concrete reaches the designed strength; mounting a triangular bracket at the lower edge of the cantilever beam, wherein the triangular bracket is integrally hoisted after being assembled in blocks on site; mounting an upper-layer section steel bracket on the lower edge of the cantilever beam, wherein the upper-layer section steel bracket is hoisted in three layers after being assembled in blocks on site;
step S3, mounting the overhanging scaffold; mounting a bottom die; binding steel bars; the counter-pulling finish-rolling deformed steel bars are installed, the reinforcing templates are counter-pulled, and then the counter-pulling rods of the counter-pulling templates of the two pier columns are connected inside the door-shaped support through the connectors and the finish-rolling deformed steel bars with corresponding lengths, so that the support camber at two sides is balanced;
s4, casting the vase section concrete; capping beam reinforcing steel bar, concrete construction and prestress construction; adjusting the screw top, and dismantling the brackets in layers.
2. The method of claim 1, wherein there is one and only one steel feed-through rod in the triangular bracket.
3. The construction method according to claim 1, wherein the upper layer steel brackets are horizontally layered into three layers, including a first layer of the upper layer brackets, a second layer of the upper layer brackets and a third layer of the upper layer brackets.
4. The construction method according to claim 1, wherein in step S3, after the finish-rolled deformed bars are installed, the brackets on both sides are equally stressed by the balanced pouring of concrete on both sides, and the outward deformation is slightly deformed to generate a counter-tension force in the finish-rolled deformed bars.
5. The large cantilever concrete bent cap few embedded part assembled bracket is characterized in that the bracket comprises a pier stud; a cantilever beam is arranged on the pier stud; the lower edges of the two ends of the pier column of the cantilever beam are provided with triangular brackets; the cantilever beam is provided with upper-layer section steel brackets on the upper edges of two ends of the pier stud; the upper bracket comprises an upper bracket first layer, an upper bracket second layer and an upper bracket third layer; the number of the upper-layer brackets is two, and counter-drawing finish-rolling deformed steel bars are connected between the two upper-layer bracket supports; the pier stud is also provided with a through steel bar.
6. The fabricated bracket of claim 5, wherein the inner structure of the upper-layer section steel bracket is in the form of triangular blocks, and the triangular blocks are connected with each other by high-strength bolts in a fabricated manner.
7. The assembly type bracket of claim 5, wherein there are two abutments, and a counter-pull rod is connected between the two abutments.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011250919.8A CN112411383A (en) | 2020-11-11 | 2020-11-11 | Large cantilever concrete bent cap few-embedded-part assembled bracket and construction method thereof |
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| CN202011250919.8A CN112411383A (en) | 2020-11-11 | 2020-11-11 | Large cantilever concrete bent cap few-embedded-part assembled bracket and construction method thereof |
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| CN102286925A (en) * | 2011-07-08 | 2011-12-21 | 四川路航建设工程有限责任公司 | Bridge single column pier assembled box bracket system and mounting method thereof |
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| CN110184926A (en) * | 2019-05-14 | 2019-08-30 | 宁波市政工程建设集团股份有限公司 | A kind of public affairs rail is built together the overhead pier stud construction method of double-layer integrallyization |
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2020
- 2020-11-11 CN CN202011250919.8A patent/CN112411383A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20030093680A (en) * | 2002-06-05 | 2003-12-11 | 브이에스엘코리아 주식회사 | The construction method of double-t girder bridge by underslung movable scaffolding system |
| CN102286925A (en) * | 2011-07-08 | 2011-12-21 | 四川路航建设工程有限责任公司 | Bridge single column pier assembled box bracket system and mounting method thereof |
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