阅读说明：本技术 用于组合u形加强梁桥面的施工系统及其方法 (Construction system and method for combined U-shaped reinforcing beam bridge floor ) 是由 潘迪 维拉萨米·塔瓦马尼 拉尼 塔瓦马尼·潘迪·杰安泰 于 2018-06-22 设计创作，主要内容包括：公开了一种组合U形钢筋混凝土和钢梁桥面的施工系统及其方法。该系统由多根具有不对称顶翼缘的钢主梁、多根连接在主梁底翼缘上方的横梁和U形RCC梁构成,该U形RCC梁包括主梁上方的混凝土翼缘、腹板和横梁上方的桥面板。为铁路/公路提供检查通道/防撞护栏。系统可采用高达3轨道/四条车道道路。在现场浇筑施工中,主梁放置在支承件上方。横梁被连接并浇注混凝土。在预制施工中,将带有顶板的主梁预制并放置在支承件上方。两个或多个带有预制板的梁连接到主梁的腹板。混凝土腹板部分现场浇筑。(A construction system and method for combining U-shaped reinforced concrete and steel beam bridge surface is disclosed. The system is composed of a plurality of steel main beams with asymmetric top flanges, a plurality of cross beams connected above bottom flanges of the main beams and U-shaped RCC beams, wherein each U-shaped RCC beam comprises a concrete flange above the main beam, a web plate and a bridge deck above the cross beams. Providing an inspection way/crash barrier for railways/highways. The system may employ up to 3 tracks/four lane roads. In cast-in-place construction, the main beams are placed above the supports. The beams are connected and concrete is poured. In the prefabrication construction, a main girder with a top plate is prefabricated and placed over a support. Two or more girders with precast slabs are connected to the web of the girder. The concrete web sections are cast in place.)

1. A construction system combining U-shaped reinforced concrete and steel beam bridge decks, the system comprising:

The main beams comprise asymmetric top flanges (1a), symmetric bottom flanges (1b) and webs (1 c);

A plurality of cross beams (2), said plurality of cross beams (2) comprising end cross beams and intermediate cross beams, said plurality of cross beams (2) being connected to said main beam, wherein said cross beams are bent in the vicinity of the support so as to match said bottom flange (1b) of said main beam;

At least one U-shaped RCC beam provided with a top flange (3a), a web (3b) and a deck slab (3c), wherein the deck slab (3c) and the web (3b) are configured above the asymmetric top flange (1a) of the girder, and the concrete deck slab (3c), the web (3b) and the concrete flange (3a) above the top flange (1a) of the girder form a U-shape;

At least one crash barrier (4), wherein a 1.5m walkway or a 0.45m service aisle is provided between the crash barrier (4) and the web (3b) of the U-shaped RCC beam;

Wherein the top flange (1a) of the main beam is asymmetric so as to receive the top flange (3a) of the U-shaped RCC beam above the top flange (1a) of the main beam;

wherein the top flange (3a) of the U-shaped RCC beam protrudes 3cm into the concrete for welding.

2. A combined U-shaped reinforced concrete and steel beam deck construction system as claimed in claim 1, including said main beams and said cross beams having a uniform spacing of 2.5 m.

3. A combined U-shaped reinforced concrete and steel beam deck construction system as claimed in claim 1 wherein said end beams are U-shaped surrounding RCC beams and the middle beam is an I-beam.

4. A combined U-shaped reinforced concrete and steel beam deck construction system as claimed in claim 1, further comprising reinforcing bars provided on the outer surface of the main beam.

5. A combined U-shaped reinforced concrete and steel beam deck construction system as claimed in claim 1, comprising said main beams made of steel.

6. A combined U-shaped reinforced concrete and steel beam bridge deck construction system according to claim 1, characterized by comprising said cross beams (2), the top flanges of said cross beams (2) being curved to provide camber in the carriageway for up to four lanes for highways and up to three lanes for railway/subway tracks.

7. A combined U-shaped reinforced concrete and steel beam deck construction system as claimed in claim 1, wherein the framing action of said system reduces bending moments and deflections of said main and cross beams, making it suitable for longer spans.

8. A construction prefabrication method for a combined U-shaped reinforced concrete and steel beam bridge floor comprises the following steps:

Assembling steel main beams and cross beams fabricated in situ with shear connectors for spans in excess of 15 m;

Placing the girder with the panels upside down with a grade of concrete equal to or higher than the bridge deck concrete so that the stresses are within allowable limits;

If processing capacity is available, prefabricating the web;

Prefabricating two or more cross beams with top plates to enhance moment of inertia to carry constant and live loads;

placing the main beam with the deck in a position above the supports, wherein the cross beam with the deck is to be connected to the web of the main beam and cast the web portion in situ.

9. A field construction method for a combined U-shaped reinforced concrete and steel beam bridge floor comprises the following steps:

Assembling steel main beams and cross beams fabricated in situ with shear connectors for spans in excess of 15 m;

Placing the main beam at a position where the cross beam is to be connected;

Performing concrete pouring in the web portions and panels on the top flanges of the main beams;

laying a 6mm MS bridge deck plate above the top of the cross beam and welding by using a 3mm fillet weld;

casting concrete in the deck sections is performed to ensure better force transfer and deflection control after 14 days of casting concrete over the top flanges and web portions of the main beam panels.

10. A method of constructing a combined U-shaped reinforced concrete and steel beam bridge deck according to claim 9, comprising said deck slab being corrugated and formed of GI in the range of 1 mm.

Technical Field

the invention relates to the field of bridge engineering, in particular to a reinforced concrete combined bridge floor for economic and rapid track construction. More particularly, the present invention relates to a construction system and method for combined U-shaped reinforced concrete and steel beam decks for railway, subway and highway bridges.

Background

in the combined construction of a highway bridge, the girders are placed in the traffic direction at intervals of about 2.5m to cover the deck width. Each beam is designed to receive live loads of the directrix. The construction depth plays an important role in bridge design and approach cost. For a span of 24m to 45m, the construction depth (road top to beam bottom) is 2m to 3.5 m. A half-through or half-through steel beam is constructed and can be used for shorter spans due to its smaller moment of inertia.

In a multi-beam system, each beam is designed to receive the load in the strip (strip). The construction depth (from the bottom of the main beam to the road level) is high. The weight of the steel used is high. The bracing and diaphragm arrangement adds weight and increases construction time. The construction will be performed on site. A trestle beam and a plurality of pillars are required to support the deck. A complex template is required. The intersection needs to be closed to interfere with traffic, which is not suitable for rapid track construction. Trapezoidal bridge deck system steel is used less, but the construction depth is more, and it leads to the increase of approach cost. The more exposed areas, the more susceptible to rain and weathering factors. The properties of the steel of the main beam constructed by the middle bearing type steel are independently used. More beam depth and amount of steel is required which can be used for short spans. The more exposed areas, the more susceptible to rain and weathering factors. The PSC U-beam is used only for single-lane railroad bridges. The casting is done on site requiring complex forms, which are constructed to span up to 18m and are also not suitable for multi-lane road/railway bridges.

Multi-girder composite girder overpasses (road over bridges) with a girder spacing of about 2.5m were constructed. The double beam trapezoidal deck is constructed with crossbeams at the level of the top flanges. A steel middeck is being constructed in which the main beam steel properties are used alone. U-shaped PSC beams are constructed for short span single-track railroad bridges. A U-shaped RCC beam and steel beam combination bridge for single-lane roadways, a main I-beam with symmetrical cross-section flat bottom and top beams, has been built at a locomotive factory (Loco Works) railway station near Chennai (Chennai). Due to the symmetrical flanges of the main beam, the web of the U-shaped beam is disconnected. The top flanges of the concrete are not of equal width and the combined properties of the main beams are not fully utilized.

disclosure of Invention

It is to be understood that this disclosure is not limited to the specific systems and methods described, as there may be many possible embodiments of the disclosure that are not explicitly described in this disclosure. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only, and is not intended to limit the scope of the present disclosure.

According to a basic aspect of the present invention, there is provided a construction system for a deck of a composite U-shaped reinforcing beam, comprising a plurality of main beams, a plurality of cross beams (including end cross beams and middle cross beams), U-shaped RCC beams, drainage/inspection channels (railway/subway), crash barriers (road) and rails. The main beam (made of steel) is provided with asymmetric top flanges, a web and symmetric bottom flanges. The cross beam is connected above the bottom flange of the main beam. The cross beams are bent near the supports to match the bottom flanges of the main beams. The end beams are U-shaped surround RCC beams and the middle beams are I-beams. The uniform spacing of the beams is about 2.5 m. The U-shaped RCC beam is provided with a top flange, a web and a deck slab, such that the deck slab is constructed above a beam that is connected to the web 5cm above the bottom flange of the main beam. The deck slab, concrete web and concrete above the top flange of the main beam form a U-shape. And a pedestrian passageway of 1.5m or a service passageway of 0.45m is arranged between the anti-collision guardrail and the web plate of the U-shaped RCC beam. An inspection channel and a cable/drainage pipeline are arranged on the railway/subway bridge.

further, the top flanges of the main beams are asymmetrical so as to receive the U-shaped RCC beam thereon. The top flange of the main beam protrudes 3cm into the concrete for welding. The properties of the main, cross and U beams are modified to increase the moment of inertia. The strengthening rib sets up on the surface of girder. The top flange of the cross-beam is curved so as to provide camber in the traffic lane for up to four lanes for highways and up to three lanes for railway/subway tracks. The framing action of the system reduces bending moments and deflections of both the main beams and cross beams. To save on the construction expense of the main and cross beams, a pre-camber is provided to offset the constant load and 50% live load deflection. The semi-through steel composite beam arrangement can provide spans up to 36m on the E250/350 scale and 45m or more on the E410 scale with plate girders. For spans of 45 and above, pre-camber should be provided to include deflections less than L/600. The density of the expanded shale clay and slate is 1600kg/m³the lightweight concrete can be used to save the construction expense of adopting the same section with longer span.

According to another aspect of the present invention, there is provided a construction prefabrication method of a combined U-shaped reinforced concrete and steel beam bridge deck, comprising the steps of: the main beam with the top plate is prefabricated to enhance the moment of inertia so as to bear constant load and live load. If processing capacity is available, the web can be prefabricated. In order to avoid formworks, the girders with the panels are prefabricated upside down, and the concrete grade may be equal to or higher than the bridge deck concrete, so that the stresses are within the allowed limits. Two or more cross beams are prefabricated with a top plate to enhance the moment of inertia to carry constant and live loads. The main beam with the top plate is held in place. The beam with the deck should be connected to the main web and the concrete web can be cast in place.

according to another aspect of the present invention, there is provided a method of constructing a combined U-shaped reinforced concrete and steel beam deck in situ, comprising the steps of: the main beam is placed where the cross beams will be connected. The concrete pouring can be completed in one step. To save on construction costs, concrete is first poured into the panels on the top flanges of the main and web sections. A 6mm mild steel deck slab may be laid over the top of the beam and welded with a 3mm fillet weld. Casting concrete is performed on the deck sections to ensure better force transfer and deflection control after 14 days of casting concrete on the flanges and main web sections. Before opening traffic, crash barriers, wearing courses, inspection channels and drainage and cabling and protective arrangements should be made.

Drawings

The above and other features of this invention will become more apparent in the detailed description which ensures this invention when read in conjunction with the accompanying drawings wherein:

Fig. 1 shows a schematic view of a combined U-shaped reinforced concrete and steel girder bridge deck construction system implemented in a railway bridge according to the present invention.

Fig. 2 shows a schematic view of a combined U-shaped reinforced concrete and steel girder bridge deck construction system implemented in a highway bridge according to the present invention.

Detailed Description

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. However, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. The following description and the annexed drawings are not to be construed as limiting the invention and numerous specific details are set forth in order to provide a thorough understanding of the invention, as a basis for the claims and as a basis for teaching one skilled in the art how to make and/or use the invention. However, in certain instances, well-known or conventional details are not described in order not to unnecessarily obscure the present invention in detail.

Referring to fig. 1, the present invention is shown as a schematic view of a construction system applied to a combined U-shaped reinforced concrete and steel beam deck implemented in a railway bridge, which includes a plurality of main beams, a plurality of cross beams (2) including end cross beams and middle cross beams, U-shaped RCC beams, a drain pipe (4), and a track (5). The main beam (made of steel) is provided with an asymmetric top flange (1a), a symmetric bottom flange (1b) and a web plate (1 c). The cross beam (2) is connected to the main beam. The cross beams are bent in the vicinity of the supports so as to match the bottom flanges (1b) of the main beams. The even interval of girder and crossbeam is 2.5 m. The end beams are U-shaped surround RCC beams and the middle beams are I-beams. The U-shaped RCC beam is provided with a top flange (3a), a web (3b) and a deck slab (3c) such that said deck slab (3c) and said web (3b) are configured above the beam and the flanges (3) above the asymmetric top flange (1a) of the girder. The concrete bridge deck (3c), the web (3b) and the concrete flanges (3a) form a U-shape. The top flanges (1a) of the main beams are asymmetric so as to receive the U-shaped RCC beams on the top flanges (1 a). And the top flange (1a) of the main beam protrudes 3cm into the concrete for welding.

in one embodiment of the invention, reinforcing ribs are provided on the outer surface of the main beam. The top flange of the cross beam (2) is curved to provide camber in the traffic lane for up to four lanes for highways and up to three lanes for railway/subway tracks. A combined U-shaped reinforced concrete and steel beam deck is constructed by means of a new force transmission system providing the interaction of the U-shaped RCC beam, main beam and cross beam combination, thereby significantly reducing the deflection and bending moment at the center of the span in the main beam and cross beam and accommodating longer spans.

Referring to fig. 2, the present invention is shown as a schematic view of a construction system applied to a combined U-shaped reinforced concrete and steel beam deck implemented in a highway bridge, which includes a plurality of main beams, a plurality of cross beams (2) including end cross beams and middle cross beams, U-shaped RCC beams, and a crash barrier (4).

in another embodiment of the invention, wherein a 1.5m walkway or a 0.45m service aisle is provided between the crash barrier (4) and the web (3b) of the U-shaped RCC beam.

the invention has the advantages that:

1. the invention ensures that a light weight and less deep deck results in a lighter substructure and foundation and a smaller approach length and thus reduces land utilization. It reduces bridge and approach costs and facilitates rapid track construction, thereby eliminating cost and time overruns. The combined action of the main beams makes the structure lighter and suitable for longer spans up to 72m span with an improved aesthetic appearance.

2. for existing railway, subway and highway bridges, the light deck without the trestle beams is suitable for rapid track repair/reconstruction, increasing the span in addition to the increased vertical clearance and overall saving of bridge costs.

3. The beam can be factory fabricated, resulting in better quality and less field work, resulting in rapid track and quality construction.

4. The main girders with panels on top can be prefabricated and the deck can be prefabricated with the cross girders and connected to each other, which results in a rapid track construction. The prefabricated double beam system can be erected (1aunched) over the supports with minimal poured concrete over the web portions. The absence of support system diaphragms, column-beam connection columns/supports, complex formwork arrangements and minimal disturbance to traffic also make it suitable for rapid track construction.

5. Alternatively, main and cross girders may be erected, and 6mm mild steel deck slabs may be laid and welded to the cross girders and cast-in-place construction methods. The reinforcement may be preassembled. The absence of support system diaphragms, column beam connection posts/supports, complex formworks and minimal disturbance to traffic makes it suitable for rapid track construction.

6. Part or all of the deck may be prefabricated to have a combination of properties in advance to reduce the depth, weight, deflection and weight of the underlying structure and foundation of the beam. The total cost of the bridge can be reduced by over 1/3.

7. By designing two main beams with U-shaped RCC beams and independently utilizing the properties of the steel beams to share the load of half of the steel beam bridge floor, the weight of the used steel can be reduced.

8. the construction depth is small compared to a double beam composite trapezoidal deck, whereas the construction depth for a roadway (i.e. the top of the road to the bottom of the beams/girders) is about 1m, up to four lanes for highways and up to three lanes for railways or subway tracks. The metering reduction in road horizon reduces the approach length by 60 m.

9. The durability of the bridge is higher due to less exposure to rain and weathering factors compared to the double girder trapezoidal deck and the bridge girder.

it is emphasized that the abstract of the disclosure is provided to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. In addition, in the foregoing detailed description, it can be seen that various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description, with each claim standing on its own as a separate embodiment. In the claims that follow, the terms "including" and "in which" are used as the plain-english equivalents of the respective terms "comprising" and "wherein," respectively. Furthermore, the terms "first," "second," "third," and the like are used merely as labels, and are not intended to impose numerical requirements on their objects.

Without further elaboration, it is believed that one skilled in the art can, using the preceding description and the illustrated examples, make and use the present invention and practice the claimed methods. It should be understood that the foregoing discussion and examples merely set forth a detailed description of certain preferred embodiments. It will be apparent to those skilled in the art that various modifications and equivalents can be made without departing from the spirit and scope of the invention.