CN115467231A

CN115467231A - Assembled trompil waffle decking I-beam structure

Info

Publication number: CN115467231A
Application number: CN202211282176.1A
Authority: CN
Inventors: 段晓伟; 艾杰; 车俊; 陈延飞; 沈浩浩; 魏洋洋
Original assignee: Gansu Jiaoshezhiyuan Industrial Co ltd
Current assignee: Gansu Jiaoshezhiyuan Industrial Co ltd
Priority date: 2022-10-19
Filing date: 2022-10-19
Publication date: 2022-12-13

Abstract

The invention belongs to the field of bridge engineering, and particularly relates to an assembled perforated waffle bridge deck I-beam structure which comprises a UHPC I-beam, a UHPC waffle bridge deck with a hole, transverse partition plates and a shear connector, wherein a bent steel bar is pre-embedded in the top plate position of the UHPC I-beam as a shear connector during prefabrication, the prefabricated UHPC waffle bridge deck with the hole is connected with the I-beam by pouring a UHPC material at the position of the shear connector, transverse joints and longitudinal joints are reserved between the UHPC waffle bridge deck with the hole, and the UHPC is poured at the positions of the joints for connection.

Description

Assembled trompil waffle decking I-beam structure

Technical Field

The invention relates to the technical field of assembly type highway bridge engineering construction, in particular to an I-beam structure of an assembly type open-hole waffle bridge deck.

Background

The main reasons causing common diseases of the bridge deck slab of the common concrete beam bridge are that the self weight of the upper concrete structure is too large and tensile stress is generated under the action of repeated vehicle load to cause cracking, so that the safety and durability of the bridge deck slab structure are seriously affected, and the technical problem which needs to be solved urgently by the bridge deck structure is solved.

The UHPC material is adopted to build a bridge structure, and the UHPC material is used for building the bridge structure as a novel cement-based composite material integrating ultrahigh strength, ultrahigh toughness and ultrahigh durability so as to improve the self-weight problem of an upper structure and the cracking problem of a bridge deck plate.

Aiming at the problem that the downwarping of the span middle position of the common concrete I-shaped girder, the cracking of a web plate and the like easily cause poor durability, the problem that the I-shaped girder and a bridge deck are easy to crack is solved by utilizing the good tensile property and durability of the UHPC.

The girder adopts UHPC I-shaped girder in order to solve the dead weight problem of bridge superstructure, and the connection between I-shaped girder and the decking adopts pre-buried shear force key to fill UHPC material, guarantees the adhesive property between the beam slab.

Content of patent

The invention aims to provide an I-shaped beam structure of an assembled perforated waffle slab, which is characterized in that a waffle slab structure with a notch and an I-shaped girder structure with a shear connecting key are prefabricated in a factory, and the notch and a diaphragm plate are cast simultaneously after the girder and the slab structure are hoisted on site, so that secondary casting is avoided, the construction process is simple, the overall construction difficulty of the project is reduced, and the construction quality and efficiency of the upper structure of the bridge are ensured.

In order to achieve the purpose, the invention provides the following scheme:

the invention provides an I-beam structure of an assembled open-hole waffle bridge panel, which comprises an I-beam structure, wherein the upper surface of the I-beam structure is uniformly paved with the waffle bridge panel;

the I-shaped beam structure comprises a plurality of uniformly laid I-shaped main beams, every two adjacent main beams are connected through a transverse partition plate, notches are reserved on two sides of each main beam during prefabrication, and the transverse partition plate is connected with the main beams through the notches;

the shear connecting pieces are embedded in the upper surface of the main beam during prefabrication, the shear connecting pieces are made of bent steel bars, the waffle bridge panels are connected with the main beam through the shear connecting pieces, and transverse joints and longitudinal joints are reserved between the waffle bridge panels.

Furthermore, the main beam, the transverse clapboard and the waffle slab are all prefabricated by UHPC.

Furthermore, a slotted hole is formed in the surface of the waffle bridge deck, the position of the slotted hole corresponds to the position of the embedded shear connecting key of the main beam, and the slotted hole close to the slotted hole is communicated with the slotted hole and used for pouring UHPC concrete.

Furthermore, the diaphragm plate comprises a cross beam, T-shaped steel plates are pre-embedded when the two ends of the cross beam are prefabricated, and a plurality of preformed holes are reserved in the T-shaped steel plates, so that the main beam and the diaphragm plate have good bonding performance.

Further, the outside cover of crossbeam is equipped with two rubber slabs, rubber slab swing joint is in the outside of crossbeam to bond in the outside of girder left and right sides notch through the high strength bonding colloid, make the notch form open-top's airtight chamber.

Furthermore, the contact position of the inside of the notch and the T-shaped steel plate is subjected to roughening treatment, and the roughening treatment is formed by any one of the processes of pre-grooving, grooving and roughening and is used for improving the bonding performance between the diaphragm plate structure and the main beam.

Furthermore, the bottom of the shear connector is positioned on the main beam and is provided with a groove, the groove positioned at the upper end of the notch is communicated with the notch, and UHPC concrete can conveniently flow into the notch in the pouring process.

The utility model provides an assembled trompil waffle slab I-beam structure, its construction method lies in: the method comprises the following steps:

1) After the prefabricated UHPC girder with the shear connector is hoisted in place, hoisting the prefabricated UHPC transverse partition plate structure;

2) Mounting the diaphragm plate in the notch between the two main beams, pulling the rubber plate, and bonding the rubber plate outside the notches at the left side and the right side of the main beams through high-strength bonding colloid to form a closed cavity with an open top at the notch;

3) Then hoisting the prefabricated UHPC waffle bridge panel with the slotted holes on the main beam;

4) Then pouring transverse joints and longitudinal joints of the waffle bridge deck by adopting UHPC concrete, and filling the notches of the main beams and the slotted holes of the waffle bridge deck by the slotted holes on the waffle bridge deck;

5) And after pouring is completed, installing the bridge expansion joint, setting a bridge deck waterproof layer, and putting into use after paving the asphalt concrete oil surface.

Compared with the prior art, the invention has the following advantages:

1. compared with the traditional prestressed concrete I-beam structure, the assembled UHPC waffle bridge panel I-beam structure fully utilizes the excellent compression resistance and tensile resistance of the UHPC material, reduces the dead weight of the beam height and the structure, can be prefabricated, assembled and used, shortens the construction period of the structure and overcomes the defects of the traditional common concrete I-beam structure.

2. The integral upper structure of the assembled UHPC waffle slab structure adopts a prefabricated assembly type, so that the process of a cast-in-place layer of the bridge deck is omitted, and the construction progress is greatly improved.

3. Compared with the common concrete bridge deck slab, the cross section size and the dead weight of the UHPC bridge deck slab structure are greatly reduced, but the UHPC bridge deck slab has too low interface rigidity, and the pretensioning method prestressed waffle bridge deck slab can not only overcome the defects of the structure and the durability of the common concrete structure, but also avoid the defect of too low rigidity of the UHPC bridge deck slab.

4. The connection between the waffle bridge panel and the I-beam is realized by adopting an I-shaped main beam with a shear connector and a prestressed UHPC waffle bridge panel with a notch through pouring UHPC grouting material at the notch position, so that the bonding performance between the beam plates is excellent.

5. The connection position between diaphragm and the girder can be pour through the slotted hole of decking, and the connection between girder and the decking pours the notch position immediately after pouring at the diaphragm position, can avoid overall structure's secondary to pour, has saved one construction process.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of an assembled structure of an assembled open-hole waffle slab;

FIG. 2 is a schematic structural view of an I-beam of an assembled open-hole waffle bridge panel;

FIG. 3 is a schematic view of the diaphragm;

FIG. 4 is a schematic view of a prestressed I-beam structure with shear connectors;

fig. 5 is a schematic view of the structure at a in fig. 4.

In the figure: 1-I-beam, 11-main beam, 111-notch, 112-shear connector, 113-bottom groove, 12-diaphragm plate, 121-T-shaped steel plate, 122-rubber plate, 123-cross beam and 2-waffle slab;

detailed description of the invention

The technical solutions in the embodiments of the present invention will be fully described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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, shall fall within the scope of protection of the present invention.

Aiming at the problems that the downwarping of the span middle position of the common concrete I-shaped main beam, the cracking of the web plate and the like are easy to cause poor durability, the self weight of the common concrete bridge deck structure is too large and the like, the problem that the I-shaped main beam and the bridge deck are easy to crack is solved by utilizing the good tensile property and durability of the UHPC. The invention aims to provide an I-beam structure of an assembled waffle bridge deck and a construction method thereof, which are used for solving the problems in the prior art, reducing the beam height and the dead weight, being capable of being prefabricated and assembled, having short construction period, high bridge economy and low later operation and maintenance cost.

Based on the theory, the invention provides an I-beam structure of an assembled open-pore waffle bridge deck, which is structurally shown in figures 1-5 and comprises an I-beam structure 1, wherein waffle bridge decks 2 are uniformly laid on the upper surface of the I-beam structure 1;

the I-beam structure 1 comprises a plurality of I-shaped main beams 11 which are uniformly laid, every two adjacent main beams 11 are connected through transverse partition plates 12, notches 111 are reserved on two sides of each main beam 11 during prefabrication, and the transverse partition plates 12 are connected with the main beams 11 through the notches 111;

the shear force connecting piece 112 is pre-embedded on the upper surface of the main beam 11 during prefabrication, the shear force connecting piece 112 is made of bent steel bars, the waffle bridge deck 2 is connected with the main beam 11 through the shear force connecting piece 112, and transverse seams and longitudinal seams are reserved between the waffle bridge deck 2;

the girder 11, the diaphragm plate 12 and the waffle slab 2 are all prefabricated by UHPC.

Preferably, as shown in fig. 1: the surface of the waffle slab 2 is provided with a slotted hole, the position of the slotted hole corresponds to the position of the embedded shear connection key 112 of the main beam 11, wherein the slotted hole close to the slotted hole 111 is communicated with the slotted hole 111, and the slotted hole is used for pouring UHPC concrete.

Preferably, as shown in fig. 3: the diaphragm plate 12 comprises a cross beam 123, T-shaped steel plates 121 are pre-embedded when two ends of the cross beam 123 are prefabricated, and a plurality of preformed holes are reserved in the T-shaped steel plates 121, so that the main beam 1 and the diaphragm plate 12 have good adhesive property.

Preferably, as shown in fig. 3: the outside cover of crossbeam 123 is equipped with two rubber slabs 122, and rubber slab 122 swing joint is in the outside of crossbeam 123 to bond in the outside of girder 11 left and right sides notch 111 through the high-strength adhesive colloid, make notch 111 form open-topped closed chamber.

Preferably, as shown in fig. 5: the contact position of the inside of the notch 111 and the T-shaped steel plate 121 is subjected to roughening treatment, and the roughening treatment is formed by any one of pre-groove treatment, grooving treatment and roughening treatment and is used for improving the bonding performance between the diaphragm plate 12 structure and the main beam 11.

Preferably, as shown in fig. 4: the bottom of the shear connector 112 is positioned on the main beam 11 and is provided with a groove, and the groove positioned at the upper end of the notch 111 is communicated with the notch 111, so that UHPC concrete can conveniently flow into the notch 111 in the pouring process.

The construction method comprises the following steps: after the prefabricated UHPC main beams 11 are hoisted in place, a prefabricated UHPC transverse clapboard 12 structure is hoisted, the transverse clapboard 12 is installed inside a notch 111 between the two main beams 11, a rubber plate 122 is pulled and is bonded outside the notches 111 on the left side and the right side of the main beams 11 through high-strength bonding colloid, so that the notches 111 form a closed cavity with an open top, then the prefabricated UHPC waffle bridge deck 2 with a slotted hole is hoisted on the prefabricated main beams 11 with shear connectors 112, then the UHPC concrete is adopted to realize the pouring of the transverse joint and the longitudinal joint of the waffle bridge deck 2, the slotted hole on the waffle bridge deck 2 is filled in the notch 111 of the main beam 11 and the slotted hole of the waffle bridge deck 2, after the pouring is finished, a bridge expansion joint is installed, a bridge deck waterproof layer is arranged, and the structure can be put into use after the asphalt concrete oil surface is paved.

It should be noted that: pouring the main beam 11 on a special pre-tensioning method pedestal, embedding a shear connector 112 on the top of the main beam 11 before pouring, curing by high-temperature steam, symmetrically releasing tensile stress steel bundles one by one after the strength reaches 90% of the designed strength and the age is not less than 7d, and then curing for 28d under natural conditions.

Secondly, prefabricating the assembled UHPC waffle slab, installing a waffle slab formwork with a notch, tensioning the prestressed steel bars, paving a steel bar net, then pouring UHPC ultrahigh-performance concrete, and vibrating and compacting the UHPC ultrahigh-performance concrete in the formwork uniformly. And after the UHPC material reaches a certain strength, removing the die and maintaining until the designed strength is reached.

In order to make the shear connectors 112 correspond to the positions of the notches 111, the prefabricated UHPC waffle bridge deck 2 is required to reserve steel bars and arrange the steel bars at equal intervals with the shear connectors 112 on the main beam 11.

Generally, the assembled perforated waffle slab I-beam structure fully exerts the structural stress characteristics of the UHPC waffle slab and the pre-tensioned prestressed UHPC I-beam girder, and adopts the connection form of cluster type notch shear keys and the assembly-free transverse partition plate structure, so that the upper structure of the bridge has the advantages of light self weight, convenient construction, few joints, excellent durability and the like, can adapt to the development requirements of the assembled bridge structure, can resist the durability of concrete in special environments, and can obviously reduce the whole-life operation and maintenance cost.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.

The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims

1. The utility model provides an assembled trompil waffle slab I-beam structure which characterized in that: the structure comprises an I-beam structure, wherein a waffle bridge deck is uniformly paved on the upper surface of the I-beam structure;

2. The fabricated open-cell waffle slab i-beam structure as claimed in claim 1, wherein: the main beam, the transverse partition plate and the waffle slab are all prefabricated through UHPC.

3. The fabricated open-cell waffle slab i-beam structure as claimed in claim 1, wherein: the wall body is characterized in that a slotted hole is formed in the surface of the waffle bridge deck, the position of the slotted hole corresponds to the position of the embedded shear connecting key of the main beam, and the slotted hole close to the slotted hole is communicated with the slotted hole and used for pouring UHPC concrete.

4. The fabricated open-cell waffle slab i-beam structure as claimed in claim 1, wherein: the transverse partition plate comprises a cross beam, T-shaped steel plates are pre-embedded when two ends of the cross beam are prefabricated, and a plurality of preformed holes are reserved in the T-shaped steel plates, so that the main beam and the transverse partition plate have good bonding performance.

5. The fabricated open-cell waffle slab i-beam structure as claimed in claim 1, wherein: the outer cover of crossbeam is equipped with two rubber slabs, rubber slab swing joint is in the outside of crossbeam to bond in the outside of girder left and right sides notch through the high-strength bonding colloid, make the notch form open-topped airtight chamber.

6. The fabricated open-cell waffle slab i-beam structure as claimed in claim 1, wherein: and the contact position of the inside of the notch and the T-shaped steel plate is subjected to roughening treatment, and the roughening treatment is formed by any one of the processes of pre-grooving, grooving and roughening and is used for improving the bonding property between the diaphragm plate structure and the main beam.

7. The assembled open-hole waffle slab i-beam structure as defined in claim 1, wherein: the bottom of the shear connector is positioned on the main beam and is provided with a groove, the groove positioned at the upper end of the notch is communicated with the notch, and UHPC concrete can conveniently flow into the notch in the pouring process.

8. The assembled open-hole waffle slab I-beam structure as claimed in any one of claims 1-7, wherein the construction method comprises: the method comprises the following steps:

2) The diaphragm plate is arranged in the notch between the two main beams, the rubber plate is pulled and is bonded outside the notches at the left side and the right side of the main beams through the high-strength bonding colloid, so that the notches form a closed cavity with an opening at the top;

4) Then, pouring transverse joints and longitudinal joints of the waffle bridge deck by adopting UHPC concrete, and filling the notches of the main beams and the slotted holes of the waffle bridge deck by the slotted holes on the waffle bridge deck;