CN108060634A - Duplexing font ultra-high performance concrete-normal concrete composite beam bridge girder construction and its construction method - Google Patents

Abstract

The invention discloses a duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure and a construction method thereof. The duplex-shaped ultra-high-performance concrete-ordinary concrete composite beam bridge structure includes a duplex-shaped beam unit and a bridge deck, The bridge deck is fixed on the top of the double I-shaped beam unit, and the double I-shaped beam unit is integrally prefabricated with ultra-high performance concrete materials, and the bridge deck is cast-in-place above the double I-shaped beam unit with ordinary concrete. The double-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure disclosed by the present invention has the advantages of light weight, good durability, and can effectively reduce the width of cracks in the beam body. The construction method is simple, easy to operate, and fast in construction speed. Economical.

Description

Duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure and its Construction method

technical field

The invention relates to bridge components, bridge structures and construction thereof, in particular to a prefabricated duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure and a construction method thereof.

Background technique

Prefabricated prestressed concrete beams have the advantages of simple structure, clear stress, low cost, environmental protection, and convenient erection, and have been widely used in bridge structures.

In bridges with a span of 20m to 60m, the main cross-sectional forms are T-shaped, independent I-shaped and box-shaped. Among them, prefabricated T-shaped and independent I-shaped beams are prone to overturning during erection and hoisting, and the number of prefabricated units of these bridges There are many, and the assembly accuracy is difficult to control during the construction process; the number of prefabricated segmental box girder components in the prefabricated box girder is too large, the construction process is complicated, and the overall box girder is heavy and difficult to transport and hoist. Moreover, the above-mentioned bridges have a large number of prefabricated units, and it is difficult to control the assembly accuracy during the construction process.

Contents of the invention

The problem to be solved by the present invention is to overcome the deficiencies and defects mentioned in the above background technology, and provide a duplex-shaped ultra-high performance concrete-ordinary concrete combination with light weight, good durability, and the ability to effectively reduce the crack width of the beam body Beam bridge structure, and correspondingly provide a construction method of simple process, convenient operation, fast construction speed, and good economy.

In order to solve the above-mentioned technical problems, the technical solution proposed by the present invention is a prefabricated duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure that can be applied in bridge construction:

A duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, comprising a duplex-shaped girder unit and a bridge deck, the bridge deck is fixed above the duplex-shaped beam unit, and the duplex-shaped beam unit adopts a super The high-performance concrete material is integrally prefabricated, and the bridge deck is cast-in-place above the double I-shaped beam unit using ordinary concrete.

The above-mentioned technical solution of the present invention innovatively combines the two materials of ordinary concrete (NC) and ultra-high performance concrete (UHPC) in the bridge structure of double I-shaped beam units. Due to the low tensile strength and slow shrinkage of NC materials, become larger, under the long-term action of vehicle load and other factors, the cracks in the beam body will develop, and the reinforced concrete at the wet joints will crack, and its durability will be greatly reduced. However, NC materials are convenient and easy to obtain and the cost is low. The combination of NC and UHPC materials can not only make full use of the advantages of existing NC materials, but also take advantage of the advantages of UHPC such as high elastic modulus, high compressive strength, tensile strength and low creep characteristics. The main beam structure of the duplex girder unit can greatly reduce the size of the bridge structure, reduce the self-weight of the bridge structure, and effectively improve the effectiveness and durability of the structure against load.

In the above-mentioned double I-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, preferably: the double I-shaped beam unit includes two I-shaped beams extending longitudinally along the bridge, and the two I-shaped beams are parallel to each other. The ends of the double I-shaped beam unit are provided with end transverse partitions, and the middle part is provided with at least one middle transverse partition. The setting of the end transverse diaphragm and the middle transverse diaphragm connects the two I-shaped beams into one body, so that the overall force of the double I-shaped beam unit is better.

For the above-mentioned double I-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, preferably: the height of the end diaphragm is the same as that of the I-shaped beam and is flush with the I-shaped beam, and the width of the end diaphragm is greater than two The spacing of the I-beams and extending to both sides of the double I-beam unit. The end of the duplex girder unit placed on the bridge pier is provided with an end transverse partition at the same height as the beam, so that the duplex girder unit is not easy to overturn during hoisting and erection, ensuring the stability of the beam.

The above-mentioned duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, preferably: the height of the middle transverse partition is less than the height of the I-shaped beam, and the middle transverse partition is arranged in the middle of the two I-shaped beams and fixed Connected to I-beams and bridge decks. The end diaphragm is placed on the pier together with the beam end, which is beneficial to ensure the stability of the beam and prevent it from overturning.

The above-mentioned duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, preferably: the number of mid-diameter partitions set in each of the duplex-shaped beam units is 1-9, and a plurality of mid-cross partitions The partitions are evenly arranged longitudinally along the double I-shaped beam unit.

The above-mentioned duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, preferably: there are a plurality of duplex-shaped beam units forming the bridge structure, and the multiple duplex-shaped beam units are spliced along the transverse direction of the bridge The connecting steel bars of two double I-shaped beam units adjacent to each other in the transverse direction are connected in the wet joint of the end diaphragm, and the wet joint is poured on-site by ordinary concrete.

The above-mentioned double-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, preferably: the bridge structure is a multi-span structure in which a plurality of prefabricated UHPC double-shaped beam units are vertically erected, and each prefabricated UHPC double-shaped beam unit It consists of at least one duplex girder unit arranged side by side in a horizontal direction, and the span of a single prefabricated UHPC duplex girder unit is 20m to 60m. The bridge structure composed of multiple prefabricated UHPC duplex girder units can be a simply supported structure or a continuous bridge deck, a simply supported structure of the main girder or a continuous bridge deck and a continuous main girder structure. After the model calculation, the single-span span of the bridge Preferably it is 20m-60m.

The above-mentioned duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, preferably: the I-shaped beam includes an upper flange, a lower flange and a web, and the height-span ratio of the I-shaped beam is ~ , the width of the web is 0.10m~0.25m, the width of the upper flange is 0.18m~0.55m, the width of the lower flange is 0.45m~1.0m, and the transverse distance between two I-shaped beams is 1.2m~3.0m , the plate thickness of the bridge deck is 0.12m~0.30m. These size ranges are reasonable in force, economical and convenient in construction.

The present invention also provides a construction method for the above-mentioned duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, comprising the following steps:

(a) The double I-shaped beam unit is prefabricated integrally with ultra-high performance concrete in the factory or on site;

(b) Assemble the prefabricated duplex girder units horizontally at the construction site to obtain single-span prefabricated UHPC duplex girder units. If it is a multi-span structure, multiple prefabricated UHPC duplex girder units need to be erected vertically;

(c1) If it is a simply supported structure, it is connected at the wet joint of the end transverse diaphragm of two adjacent prefabricated double I-shaped beam units. No concrete pouring is carried out between the longitudinal girders. The ordinary concrete bridge deck is poured first, and the corresponding Expansion joints are left between adjacent longitudinal bridge decks, and then maintenance is carried out;

(c2) If the bridge deck is continuous and the main girder simply supports the structure, it is connected at the wet joint of the end transverse diaphragm of two adjacent prefabricated duplex girder units, no concrete pouring is carried out between the longitudinal main girders, and the entire bridge Pouring ordinary concrete bridge decks for maintenance;

(c3) If it is a continuous bridge deck and continuous main girder structure, it shall be connected at the wet joints of the end transverse diaphragms of two adjacent prefabricated duplex girder units, and the longitudinal wet joints between the longitudinal main girders shall be made of ordinary concrete Pouring to make the main girder continuous, and then pouring continuous ordinary concrete bridge deck for the whole bridge for maintenance;

(d) Complete the construction of bridge deck pavement and ancillary works. Compared with prior art, the advantage of the present invention is:

First, the prefabricated double I-shaped beam unit provided by the present invention adopts a new type of material UHPC. Compared with the common concrete and high-performance concrete materials commonly used now, the particles of different particle sizes in the composition materials of UHPC form the most compact packing with the optimal ratio. Its bending tensile strength can reach more than 20MPa. The use of this material can not only reduce the size of the structure and reduce the weight of the structure to realize the lightness of the main beam, reduce the engineering amount of the substructure, improve the spanning capacity of the bridge, and make the structure prefabricated, It is easier to assemble and transport, and after high-temperature steam curing, the late shrinkage is basically zero, and the late creep is also very small, which makes the present invention have sufficient protection in reducing the cracking of the prefabricated beam body; the bridge deck is mainly under pressure, and the anti- NC materials with strong compressive capacity not only meet the strength requirements but also are more economical.

Second, the present invention adopts the duplex girder unit. The duplex girder unit structure used in the present invention is not easy to overturn during hoisting and erection, and the number of prefabricated units is small, which ensures the quality of the beam during installation.

Thirdly, compared with existing bridges, the present invention adopts double I-shaped beam units with fewer joints on site, which is not only easy to construct, but also enhances the durability of the bridge structure because of fewer joints.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are For some embodiments of the present invention, those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a front view of a single-span duplex UHPC-NC composite girder bridge structure in an embodiment of the present invention.

Fig. 2 is a front view of a multi-span duplex-shaped UHPC-NC composite girder bridge and a simply supported structure girder bridge in an embodiment of the present invention.

Fig. 3 is a front view of a multi-span duplex-shaped UHPC-NC composite girder bridge with a continuous bridge deck and simply supported main girders in an embodiment of the present invention.

Fig. 4 is a front view of a multi-span duplex-shaped UHPC-NC composite girder bridge with continuous deck and continuous main girder in the embodiment of the present invention.

Fig. 5 is an enlarged cross-sectional schematic diagram at A-A in Fig. 1 .

FIG. 6 is an enlarged cross-sectional schematic view at B-B in FIG. 1 .

FIG. 7 is an enlarged cross-sectional schematic diagram at C-C in FIG. 1 .

Figure 8 is a sectional view of the end section.

Legend: 1. Duplex girder unit; 2. Bridge deck; 3. I-girder; 31. Upper flange; 32. Lower flange; 33. Web; 4. End diaphragm; 5. Transverse Partition; 6. Wet joints; 7. Longitudinal wet joints; 8. Expansion joints.

Detailed ways

In order to facilitate the understanding of the present invention, the invention will be described more comprehensively and in detail below in conjunction with the accompanying drawings and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

Unless otherwise defined, all technical terms used hereinafter have the same meanings as commonly understood by those skilled in the art. The terminology used herein is only for the purpose of describing specific embodiments, and is not intended to limit the protection scope of the present invention.

Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

Example:

A duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure as shown in Figures 1 and 5-7, including a duplex-shaped beam unit 1 and a bridge deck 2, and the bridge deck 2 is fixed on the duplex-shaped Above the beam unit 1, the double I-shaped beam unit 1 is integrally prefabricated with ultra-high performance concrete materials, and the bridge deck 2 is cast-in-place above the double I-shaped beam unit 1 using ordinary concrete. As shown in Figures 5-7, the double I-shaped beam unit 1 includes two I-shaped beams 3 extending longitudinally along the bridge. The two I-shaped beams 3 are parallel to each other. The partition 4 is provided with at least one middle transverse partition 5 in the middle.

As shown in Figure 5, the height of the end transverse partition 4 is the same as the I-shaped beam 3 and is flush with the I-shaped beam 3, and the width of the end transverse partition 4 is greater than the distance between the two I-shaped beams 3 and extends toward the double I-shaped beam. Unit 1 extends on both sides.

As shown in FIG. 6 , the height of the central transverse diaphragm 5 is smaller than that of the I-shaped beam 3 , and the central transverse diaphragm 5 is arranged between two I-shaped beams 3 and fixed on the I-shaped beam 3 and the bridge deck 2 .

As shown in FIG. 7 , the number of middle transverse partitions 5 arranged in each double I-shaped beam unit 1 is 1-9, and a plurality of middle transverse partitions 5 are evenly arranged longitudinally along the double I-shaped beam unit 1 .

As shown in Figure 8, there are two double I-shaped beam units 1 that make up the bridge structure, and the two double I-shaped beam units 1 are spliced along the transverse direction of the bridge. The connection is made in the wet joint 6 of the end diaphragm 4, and the wet joint 6 is poured on-site by ordinary concrete.

As shown in Figures 5-7, the I-shaped beam 3 in this embodiment includes an upper flange 31, a lower flange 32 and a web 33, and the height-span ratio of the I-shaped beam 3 is , the width of the web 33 is 0.12m, the width of the upper flange 31 is 0.20m, the width of the lower flange 32 is 0.80m, the transverse distance between the two I-shaped beams 3 is 1.6m, and the plate thickness of the bridge deck 2 It is 0.16m.

As shown in Figure 2, Figure 3 and Figure 4, the bridge structure of this embodiment can also be a multi-span structure in which a plurality of prefabricated UHPC double-shaped beam units are vertically erected, and each prefabricated UHPC double-shaped beam unit is arranged side by side by the horizontal It consists of at least one duplex girder unit 1, and the span of a single prefabricated UHPC duplex girder unit is 20m~60m. The arrangement of the end diaphragm and the middle diaphragm of each double I-shaped beam unit is the same as that of the double I-shaped beam unit in Figure 1, and its cross-sectional view can be seen in Figures 5-7.

The construction method of the duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure of the above-mentioned present embodiment comprises the following steps:

(a) The double I-shaped beam unit 1 is integrally prefabricated with ultra-high performance concrete in the factory or on site;

(b) Assemble the prefabricated duplex beam unit 1 horizontally at the construction site to obtain a single-span prefabricated UHPC duplex beam unit. If it is a multi-span structure, multiple prefabricated UHPC duplex beam units need to be erected vertically;

(c) 1. If it is a simply supported structure, it is connected at the wet joint 6 of the end transverse diaphragm 4 of two adjacent prefabricated double I-shaped beam units 1, no concrete pouring is performed between the longitudinal girders, and the concrete is poured separately Ordinary concrete bridge decks 2, leaving expansion joints 8 between adjacent longitudinal decks 2, and then curing (see Figure 2);

2. If the bridge deck is continuous and the main girder is simply supported, the wet joints 6 of the end diaphragms 4 of two adjacent prefabricated double I-shaped beam units 1 are connected, and no concrete is poured between the longitudinal main girders. The whole bridge is poured with ordinary concrete deck 2 for maintenance (see Figure 3);

3. If it is a continuous bridge deck and continuous main beam structure, it is connected at the wet joint 6 of the end diaphragm 4 of two adjacent prefabricated double I-shaped beam units 1, and the longitudinal wet joint 7 between the longitudinal main beams Use ordinary concrete pouring to make the main girder continuous, and then pour the continuous ordinary concrete deck 2 for the whole bridge for maintenance (see Figure 4);

(d) Complete the construction of bridge deck pavement and ancillary works.

Claims (9)

1. A duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure, including a duplex-shaped beam unit (1) and a bridge deck (2), and the bridge deck (2) is fixed to the duplex-shaped beam unit (1) above, characterized in that: the double I-shaped beam unit (1) is integrally prefabricated with ultra-high performance concrete materials, and the bridge deck (2) is cast-in-place above the double I-shaped beam unit (1) using ordinary concrete . 2. The double I-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure according to claim 1, characterized in that: the double I-shaped beam unit (1) includes two I-shaped beams extending longitudinally along the bridge ( 3), two I-shaped beams (3) are parallel to each other, the end of the double I-shaped beam unit (1) is provided with an end transverse partition (4), and the middle part is provided with at least one middle transverse partition (5) . 3. The double I-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure according to claim 2, characterized in that: the height of the end transverse diaphragm (4) is the same as that of the I-shaped beam (3) and is the same as that of the I-shaped beam (3). The girders (3) are flush, and the width of the end transverse partition (4) is greater than the distance between two I-shaped beams (3) and extends to both sides of the double I-shaped beam unit (1). 4. The duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure according to claim 2, characterized in that: the height of the middle transverse partition (5) is smaller than the height of the I-shaped beam (3), and The middle transverse partition (5) is arranged between two I-shaped beams (3) and is fixedly connected to the I-shaped beam (3) and the bridge deck (2). 5. The double I-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure according to claim 2, characterized in that: each of the double I-shaped beam units (1) is provided with a central transverse partition (5 ) is 1-9, and a plurality of intermediate diaphragms (5) are evenly arranged longitudinally along the double I-shaped beam unit (1). 6. The duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure according to any one of claims 1-5, characterized in that: the duplex-shaped beam units (1) that make up the bridge structure are multiple One, the plurality of double I-shaped beam units (1) are spliced along the transverse direction of the bridge, and the connecting reinforcement bars of two adjacent double I-shaped beam units (1) in the transverse direction are wet joints at the end diaphragm (4) Joints (6) are connected, and the wet joints (6) are poured on-site by ordinary concrete. 7. The duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure according to any one of claims 1-5, characterized in that: the bridge structure is vertically erected with a plurality of prefabricated UHPC duplex-shaped beam units The multi-span structure, each prefabricated UHPC double I-shaped beam unit is composed of at least one double I-shaped beam unit (1) arranged side by side side by side, and the span of a single prefabricated UHPC double I-shaped beam unit is 20m~60m. 8. The duplex-shaped ultra-high performance concrete-ordinary concrete composite beam bridge structure according to any one of claims 2-5, characterized in that: the I-shaped beam (3) includes an upper flange (31), lower flange (32) and web (33), the height-span ratio of the I-beam (3) ~ , the width of the web (33) is 0.10m~0.25m, the width of the upper flange (31) is 0.18m~0.55m, the width of the lower flange (32) is 0.45m~1.0m, two I-shaped beams (3) The transverse spacing is 1.2m~3.0m, and the plate thickness of the bridge deck (2) is 0.12m~0.30m. 9. A construction method of double-plex font ultra-high performance concrete-ordinary concrete composite beam bridge structure as described in any one of claims 1-8, comprising the following steps: (a) The double I-shaped beam unit (1) is integrally prefabricated with ultra-high performance concrete in the factory or on site; (b) Assemble the prefabricated duplex beam units horizontally at the construction site (1) Obtain a single-span prefabricated UHPC duplex beam unit. If it is a multi-span structure, multiple prefabricated UHPC duplex beam units need to be erected vertically ; (c1) If it is a simply supported structure, it is connected at the wet joint (6) of the end diaphragm (4) of two adjacent prefabricated double I-shaped beam units (1), and no concrete is poured between the longitudinal main beams , pour ordinary concrete bridge decks (2) first, leave expansion joints (8) between adjacent longitudinal bridge decks (2), and then perform maintenance; (c2) If the bridge deck is continuous and the main girder is simply supported, the wet joints (6) of the end transverse diaphragms (4) of two adjacent prefabricated duplex girder units (1) are connected, and the longitudinal main girder Concrete pouring is not carried out during the period, and ordinary concrete bridge deck (2) is poured for the whole bridge for maintenance; (c3) If it is a continuous bridge deck and continuous main girder structure, the wet joints (6) of the end diaphragms (4) of two adjacent prefabricated double I-shaped beam units (1) are connected at the wet joints (6) between the longitudinal main girders The longitudinal wet joints (7) of the bridge are poured with ordinary concrete to make the main girder continuous, and then the whole bridge is poured with continuous ordinary concrete deck (2) for maintenance; (d) Complete the construction of bridge deck pavement and ancillary works.