CN113510836B - T-beam prefabricating pedestal and construction method thereof - Google Patents
T-beam prefabricating pedestal and construction method thereof Download PDFInfo
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- CN113510836B CN113510836B CN202110289961.9A CN202110289961A CN113510836B CN 113510836 B CN113510836 B CN 113510836B CN 202110289961 A CN202110289961 A CN 202110289961A CN 113510836 B CN113510836 B CN 113510836B
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- pedestal
- foundation
- ground
- top surface
- pedestals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
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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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
Abstract
The invention provides a T-beam prefabricating pedestal and a construction method thereof, wherein the T-beam prefabricating pedestal comprises a pedestal foundation and a plurality of pedestals positioned above the pedestal foundation, the pedestals are arranged in parallel along the length direction of a pedestal foundation field at certain intervals, ground beams are respectively arranged in the pedestal foundation below two ends of the pedestal, the top surfaces of the ground beams are flush with the top surface of the pedestal foundation, two ends of the ground beams extend out of the pedestal, and the length direction of the ground beams is vertical to the length direction of the pedestal. According to the invention, the ground beams with a certain area are respectively poured in the pedestal foundation below the two ends of the pedestal, in the prestress tensioning process, when the T beam is upwards arched, high-strength compressive stress can be applied to the two ends of the pedestal, and the compressive stress applied to the ground beams by the pedestal can be transmitted to the pedestal foundation in a large area through the ground beams arranged on the bottom surface of the pedestal, so that the force on the bottom surface of the pedestal is uniformly dispersed to the pedestal foundation, and the problem that the pedestal foundation is settled and cracked due to overlarge local stress of the pedestal foundation is avoided.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a T-beam prefabricated pedestal and a construction method thereof.
Background
With the rapid development of economy in China, the continuous improvement of a road network, a railway network and an urban road network in China is promoted, wherein a bridge plays a vital role. The prefabricated T-shaped beam piece is an important part in bridge engineering, in China, the production of the prefabricated T-shaped beam piece needs to be completed by centralized production of a special beam making field, and the beam making pedestal is important tooling equipment of the beam making field and serves as an indispensable part in the production of the prefabricated T-shaped beam piece.
At the present stage, the T-beam is mostly constructed by adopting a post-tensioning method, wherein the post-tensioning method refers to a construction method of firstly pouring concrete and then tensioning prestressed steel materials to form a prestressed concrete member after the concrete reaches over 75% of the designed strength. Simultaneously, the bar pedestal is pour on the pedestal foundation in prefabricated field more to current pedestal, then carry out T roof beam preparation construction on the pedestal, the T roof beam is pour on the pedestal and is accomplished the back, prestressing force stretch-draw need be carried out, because the application of prestressing force, the T roof beam can upwards slightly hunch-up, at this moment, great compressive stress can be applyed to the both ends of pedestal at the both ends of T roof beam, and then make the pedestal both ends can lead to the fact great load to the basis, thereby lead to the basis of pedestal below to subside or the fracture, finally make the pedestal also receive the influence and lead to the fracture. At the present stage, in order to reduce the camber and prevent the beam top from cracking, the pedestal is usually reserved with a reverse camber, however, although the problem of beam cracking can be reduced, the problems of foundation and pedestal settlement and cracking still exist.
Disclosure of Invention
In view of this, the invention provides a T-beam prefabricated pedestal and a construction method thereof, which are used for solving the problem of settlement or cracking of pedestals and pedestal foundations during prestress tensioning.
The technical scheme of the invention is realized as follows:
on one hand, the invention provides a T-beam prefabricating pedestal which comprises a pedestal foundation and a plurality of pedestals positioned above the pedestal foundation, wherein the pedestals are arranged in parallel along the length direction of a pedestal foundation field at certain intervals, ground beams are respectively arranged in the pedestal foundation below two ends of the pedestal foundation, the top surfaces of the ground beams are flush with the pedestal foundation, the two ends of the ground beams extend out of the pedestal foundation, and the length direction of the ground beams is vertical to the length direction of the pedestal foundation.
On the basis of the above technical solution, preferably, the distance from the ground beam to the end of the pedestal is 0.5m-1m.
On the basis of the technical scheme, preferably, the pedestal is provided with a plurality of hoisting holes at equal intervals along the length direction.
On the basis of the technical scheme, preferably, the reserved pipeline of the T-beam side template split bolt is pre-embedded in the upper part of the pedestal.
Furthermore, preferably, channel steel is arranged on the top surface of the pedestal along the two sides of the width direction, and a sealing rubber tube is arranged in the channel steel.
On the basis of above technical scheme, it is preferred, the pedestal top surface is provided with the pedestal die block, pedestal die block top surface is provided with the invert arch.
On the other hand, the invention also provides a construction method of the T-beam prefabricated pedestal, which comprises the following steps of:
s1, paving 50-100 cm-thick brick slag according to actual conditions on site after leveling and compacting a prefabricated site, and leveling and compacting the brick slag;
s2, pouring a 10cmC15 concrete cushion layer on the leveled field, placing a reinforcing mesh on the cushion layer, pouring a pedestal foundation, and enclosing square grooves at two ends of the pedestal foundation by using templates;
s3, after the pedestal foundation is solidified, placing a steel bar mesh in the square groove, additionally arranging a template for supporting, and pouring a formed ground beam which is flush with the pedestal foundation;
s4, filling a rubble layer in a gap between the pedestal foundation and the ground beam, compacting, and then pouring the pedestal foundation on the rubble layer;
s5, installing pedestal reinforcing mesh and T-beam side formwork split bolt reserved pipelines on the top surface of the pedestal foundation and the top surface of the ground beam, installing pedestal formworks at the same time, and then pouring C30 concrete;
s6, after a concrete structure of the pedestal is formed, mounting a T-beam bottom die, placing the T-beam bottom die on the top end of the pedestal, mounting channel steel on two sides of the top surface of the pedestal and butting with a bottom film of the T-beam, and finally plugging a sealing rubber pipe into the channel steel;
and S7, building a prefabricated region drainage ditch after the pedestal construction is finished.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention discloses a T-beam prefabricating pedestal and a construction method, wherein ground beams with a certain area are respectively poured in pedestal foundations below two ends of the pedestal, and the width of the ground beams is kept to be larger than that of the pedestal, so that after the T-beam is manufactured on the molded pedestal, high-strength compressive stress can be applied to two ends of the pedestal when the T-beam is upwards arched in the prestress tensioning process, the compressive stress applied to the ground beams by the pedestal can be transmitted to the pedestal foundations in a large area through the ground beams arranged on the bottom surface of the pedestal, and the force on the bottom surface of the pedestal is uniformly dispersed to the pedestal foundations, so that the problem that the pedestal foundations are settled and cracked due to overlarge local stress on the pedestal foundations is avoided.
(2) By setting the distance from the ground beam to the end part of the pedestal to be 0.5m-1m, the T beam can be enabled to be applied with compressive stress just to the ground beam below when the area close to the end part of the T beam is in an inverted arch state during prestress tensioning, and then the problems of foundation settlement of the pedestal and cracking of the pedestal can be better avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic end view of a T-beam precast block disclosed in the present invention;
FIG. 2 is a schematic plan structure view of a T-beam prefabricating pedestal disclosed by the invention;
fig. 3 is a schematic side structure diagram of a T-beam prefabrication pedestal disclosed by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, with reference to fig. 2-3, the embodiment of the present invention discloses a T-beam prefabricating pedestal, which includes a pedestal foundation 1 and a plurality of pedestals 2 located above the pedestal foundation 1, the number of the required pedestals 2 is arranged according to the size of the prefabricating site and the design specification of the T-beam, the plurality of pedestals 2 are arranged in parallel along the length direction of the pedestal foundation 1 site at a certain interval, the pedestals 1 located below the two ends of the pedestal 2 are respectively provided with a floor beam 3, the top surface of the floor beam 3 is flush with the top surface of the pedestal foundation 1, the two ends of the floor beam 3 extend out of the pedestal 2, and the length direction of the floor beam 3 is perpendicular to the length direction of the pedestal 2.
Adopt above-mentioned technical scheme, through pour the grade beam 3 of certain area respectively in pedestal foundation 1 of 2 both ends belows in the pedestal, and the width that keeps grade beam 3 is greater than the width of pedestal 2, thereby make pedestal 2 after the shaping be carrying out the T roof beam preparation after, at prestressing force stretch-draw in-process, when the T roof beam upbows, can apply high strength compressive stress to 2 both ends of pedestal, through the grade beam 3 that 2 bottom surfaces of pedestal set up, can make pedestal 2 apply pressure to the grade beam 3 on the compressive stress can transmit pedestal foundation 1 by a large scale, thereby make the even dispersion of power of 2 bottom surfaces of pedestal to pedestal foundation 1, it is too big to avoid 1 local atress of pedestal foundation, lead to the pedestal foundation 1 to subside, and then lead to the 2 fracture problems of pedestal to take place.
As some preferred embodiments, when the T-beam is prestressed and tensioned on the pedestal 2, the inward arching of the T-beam is a slow process, in the process, the area of the T-beam close to the end part of the pedestal 2 is firstly abutted against the pedestal foundation 1, after the T-beam is internally arched to the maximum extent, the end part of the T-beam applies compressive stress to the pedestal foundation 1, and meanwhile, because the T-beam is internally arched, the two ends of the T-beam are arched towards the middle part, so that the stress of the pedestal foundation 1 close to the end part of the pedestal 2 is the maximum, and in order to avoid the settlement phenomenon caused by the stress transition of the pedestal foundation 1 at the position, the invention sets the distance from the ground beam 3 to the end part of the pedestal 2 to be 0.5m-1m, so that the area close to the end part of the T-beam can apply compressive stress to the ground beam 3 just below when the T-beam is reversely arched, and further can better avoid the problems of settlement of the pedestal foundation 1 and cracking of the pedestal 2.
In the above embodiment, the width of the ground beam 3 is set to 2m-3m, the length is set to 0.5m-1m longer than the width of the pedestal 2, and the thickness is 0.5m-0.8m.
In the present embodiment, the pedestal 2 is provided with a plurality of hoisting holes 21 at equal intervals along the length direction. When the hoisting hole 21 is used for hoisting a T-shaped beam, a steel wire rope is penetrated into the hoisting hole, and the top surfaces of the pedestal 2 on the two sides of the hoisting hole 21 are respectively provided with a step groove for placing a steel plate to plug the step grooves, so that the subsequent T-shaped beam can be conveniently poured.
In this embodiment, the T-beam side formwork split bolt reserved pipe 22 is embedded in the upper part of the pedestal 2. This pipeline 22 is the steel pipe material, when arranging 2 reinforcing bar nets of pedestal, with pipeline 22 ligature to the reinforcing bar net on to make pipeline 22 equidistant setting.
In this embodiment, channel steel 23 is provided on both sides of the top surface of the pedestal 2 in the width direction, and a sealing rubber tube 24 is provided in the channel steel 23. Therefore, the T-shaped beam can be prevented from leaking during grouting.
In this embodiment, pedestal 2 top surface is provided with pedestal die block 25, through setting up pedestal die block 25, can make the convenient drawing of patterns behind the T roof beam pouring shaping, and pedestal die block 25 top surface is provided with the invert, for reducing the camber and prevent that the roof beam from appearing the crack. The pedestal bottom mold 25 is provided with an inverted arch of generally 3% of the span.
The invention also provides a construction method of the T-beam prefabricating pedestal 2, which comprises the following steps:
s1, firstly excavating a loose soil layer in a T-beam prefabricated field, paving 50-100 cm-thick brick slag according to actual conditions of the field after the prefabricated field is leveled and compacted, and leveling, layering and compacting the brick slag;
s2, pouring a 10cmC15 concrete cushion layer on the leveled field, placing a reinforcing mesh on the cushion layer, pouring a pedestal foundation 1, and enclosing square grooves at two ends of the pedestal foundation 1 by using templates; the length of the cushion layer is the length of the pedestal 2 plus the installation width of the end die, and the two ends of the cushion layer are widened by 10cm, and the width of the cushion layer is the width of the pedestal 2 plus the installation width of the side die, and the two sides of the cushion layer are widened by 10cm;
s3, after the pedestal foundation 1 is solidified, placing a steel mesh in the square groove, adding a template for supporting, and pouring and molding a ground beam 3, wherein the ground beam 3 is flush with the pedestal foundation 1; the ground beam 3 is made of C15 concrete.
S4, filling a loose soil layer in a gap between the pedestal foundation 1 and the ground beam 3, compacting, and then filling broken stones in the loose soil layer and leveling;
s5, installing the bench 2 reinforcing mesh and the T-beam side formwork split bolt reserved pipelines 22 on the top surfaces of the bench foundation 1 and the ground beam 3, simultaneously installing the bench 2 formwork, and then pouring C30 concrete;
s6, after the concrete structure of the pedestal 2 is formed, mounting a T-beam bottom die, placing the T-beam bottom die on the top end of the pedestal 2, mounting channel steel 23 on two sides of the top surface of the pedestal 2 and butting with the T-beam bottom die, and finally plugging a sealing rubber tube 24 into the channel steel 23;
and S7, building the prefabricated region drainage ditch after the construction of the pedestal 2 is completed.
In summary, according to the T-beam prefabrication pedestal 2 and the construction method disclosed by the invention, the floor beams 3 with a certain area are respectively poured in the pedestal foundation 1 below the two ends of the pedestal 2, and the width of the floor beams 3 is kept larger than that of the pedestal 2, so that after the T-beam is manufactured on the molded pedestal 2, in the process of prestress tensioning, when the T-beam is upwards arched, high-strength compressive stress can be applied to the two ends of the pedestal 2, and the compressive stress applied to the floor beams 3 by the pedestal 2 can be transmitted to the pedestal foundation 1 in a large area through the floor beams 3 arranged on the bottom surface of the pedestal 2, so that the force on the bottom surface of the pedestal 2 is uniformly dispersed on the pedestal foundation 1, and the problem that the pedestal foundation 1 is settled and the pedestal 2 is cracked due to the fact that the pedestal foundation 1 is locally stressed too much is avoided.
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 that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The utility model provides a prefabricated pedestal of T roof beam which characterized in that: the platform comprises a pedestal foundation (1) and a plurality of pedestals (2) positioned above the pedestal foundation (1), wherein the pedestals (2) are arranged in parallel along the length direction of the site of the pedestal foundation (1) at a certain interval, the pedestals (1) below two ends of the pedestal (2) are respectively provided with a ground beam (3), the top surface of the ground beam (3) is flush with the top surface of the pedestal foundation, the two ends of the ground beam (3) extend out of the pedestals (2), and the length direction of the ground beam (3) is vertical to the length direction of the pedestals (2); the ground beam (3) and the pedestal (2) are arranged in a staggered mode, and the distance from the ground beam (3) to the end portion of the pedestal (2) is 0.5-1 m.
2. A T-beam prefabrication platform as claimed in claim 1, wherein: the pedestal (2) is provided with a plurality of hoisting holes (21) at equal intervals along the length direction.
3. A T-beam prefabrication platform as claimed in claim 1, wherein: and a T-shaped beam side template split bolt reserved pipeline (22) is pre-embedded in the upper part of the pedestal (2).
4. A T-beam prefabrication platform as claimed in claim 1, wherein: channel steel (23) are arranged on the two sides of the top face of the pedestal (2) in the width direction, and sealing rubber tubes (24) are arranged in the channel steel (23).
5. A T-beam prefabrication platform as claimed in claim 1, wherein: pedestal (2) top surface is provided with pedestal die block (25), pedestal die block (25) top surface is provided with the invert.
6. A construction method of a T-beam prefabrication platform using the T-beam prefabrication platform of claim 1, comprising the steps of:
s1, paving 50-100 cm-thick brick slag according to actual conditions on site after leveling and compacting a prefabricated site, and leveling and compacting the brick slag;
s2, pouring a 10cmC15 concrete cushion layer on a leveled field, placing a reinforcing mesh on the cushion layer, pouring a pedestal foundation (1), and enclosing square grooves at two ends of the pedestal foundation (1) by using templates;
s3, after the pedestal foundation (1) is solidified, placing a reinforcing mesh in the square groove, additionally arranging a template for supporting, and pouring and molding a ground beam (3), wherein the ground beam (3) is flush with the pedestal foundation (1);
s4, filling broken stones in a gap between the pedestal foundation (1) and the ground beam (3) and compacting, and then pouring the pedestal foundation (1) on the broken stone layer;
s5, installing the pedestal (2), the reinforcing mesh and the T-beam side template split bolt reserved pipelines on the top surface of the pedestal foundation (1) and the top surface of the ground beam (3), simultaneously installing the template of the pedestal (2), and then pouring C30 concrete;
s6, after the concrete structure of the pedestal (2) is formed, mounting a T-beam bottom die, placing the T-beam bottom die on the top end of the pedestal (2), mounting channel steel on two sides of the top surface of the pedestal (2) and butting with the T-beam bottom die, and finally plugging a sealing rubber pipe into the channel steel;
s7, building the prefabricated region drainage ditch after the construction of the pedestal (2) is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110289961.9A CN113510836B (en) | 2021-03-18 | 2021-03-18 | T-beam prefabricating pedestal and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110289961.9A CN113510836B (en) | 2021-03-18 | 2021-03-18 | T-beam prefabricating pedestal and construction method thereof |
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| Publication Number | Publication Date |
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| CN113510836A CN113510836A (en) | 2021-10-19 |
| CN113510836B true CN113510836B (en) | 2023-02-24 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB708062A (en) * | 1950-11-13 | 1954-04-28 | Nat Res Dev | Improvements in or relating to the production of concrete members |
| CN107571392A (en) * | 2017-09-27 | 2018-01-12 | 中建三局基础设施工程有限公司 | A kind of beam making bench for the construction of transverse tensioning method prestressing force prefabricated small box girder |
| CN108818890A (en) * | 2018-06-29 | 2018-11-16 | 中交二公局东萌工程有限公司 | A kind of I-steel T girder prefabricated pedestal and preparation method thereof |
| CN210421137U (en) * | 2019-07-22 | 2020-04-28 | 董玉才 | A bearing foundation structure for civil engineering structure uses |
| CN210969312U (en) * | 2019-10-28 | 2020-07-10 | 中交路桥建设有限公司 | Pedestal for prefabricating T-shaped beam |
-
2021
- 2021-03-18 CN CN202110289961.9A patent/CN113510836B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB708062A (en) * | 1950-11-13 | 1954-04-28 | Nat Res Dev | Improvements in or relating to the production of concrete members |
| CN107571392A (en) * | 2017-09-27 | 2018-01-12 | 中建三局基础设施工程有限公司 | A kind of beam making bench for the construction of transverse tensioning method prestressing force prefabricated small box girder |
| CN108818890A (en) * | 2018-06-29 | 2018-11-16 | 中交二公局东萌工程有限公司 | A kind of I-steel T girder prefabricated pedestal and preparation method thereof |
| CN210421137U (en) * | 2019-07-22 | 2020-04-28 | 董玉才 | A bearing foundation structure for civil engineering structure uses |
| CN210969312U (en) * | 2019-10-28 | 2020-07-10 | 中交路桥建设有限公司 | Pedestal for prefabricating T-shaped beam |
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| CN113510836A (en) | 2021-10-19 |
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