An assembled steel-concrete composite bridge and its construction method

Abstract

The present invention discloses a prefabricated steel-concrete composite bridge, which includes a steel main beam and a concrete cantilever slab. The steel main beam includes: a steel main body part, a stud part extending from the upper part of the steel main body part, and a pin part arranged above the steel main body part. The concrete cantilever slab includes: a cantilever slab main body, and a steel bar part extending from one side of the cantilever slab main body into the stud part. The steel bar part is inserted into the stud part. A recessed internal reserved card slot is arranged below the cantilever slab main body, and the pin part is inserted into the internal reserved card slot. The present invention also discloses a construction method of the prefabricated steel-concrete composite bridge as described above. The prefabricated steel-concrete composite bridge and its construction method aim to solve the technical problems of poor mechanical properties, complex processes and long construction time in the existing solution of using on-site formwork pouring to realize the small-plate concrete cantilever slab.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridges, and particularly relates to an assembled steel-concrete composite bridge and a construction method thereof. Background Art

[0002] In bridge construction, there are mainly two ideas for realizing the steel-concrete composite beam bridge deck at present, namely integral prefabrication and small plate prefabrication.

[0003] Integral prefabrication is to prefabricate the cantilever and the middle position of the bridge deck as a whole to realize integral hoisting and installation. This method has high requirements for construction machinery and construction environment, increases the hoisting and construction difficulty, and it is difficult to guarantee the quality of the connection between the bridge deck and the steel beam. It is mainly used in highway bridge projects.

[0004] Small plate prefabrication is more in line with the design idea of the assembled structure. The main feature of this method is to prefabricate the bridge deck between the main steel beams in blocks. The prefabricated plate parts are small in size and light in weight, with lower requirements for hoisting and construction. It is more suitable for municipal projects with various complex constraint conditions. Moreover, the small plate prefabricated structure has stronger adaptability and is more conducive to the standardized development of the structure of the assembled composite bridge.

[0005] In the assembled steel-concrete composite bridge project, it is difficult to cast the cantilever position of the bridge deck on site. In the prior art, a small plate concrete cantilever slab is realized by on-site formwork erection and casting. The disadvantages of the prior art are that this method has complex processes, long construction time, and it is difficult to control the quality and safety during the process of cantilever formwork erection and casting of the cantilever slab, with certain construction risks. Analyzing from the structure, this method requires pre-opening holes in the top plate of the side main beam, which destroys the integrity of the main stress structure. Summary of the Invention

[0006] (I) Technical Problems to be Solved

[0007] Based on this, the present invention provides an assembled steel-concrete composite bridge, which aims to solve the technical problems of poor mechanical properties, complex processes and long construction time in the prior art solution of realizing a small plate concrete cantilever slab by on-site formwork erection and casting.

[0008] (II) Technical Solutions

[0009] To solve the above technical problems, the present invention provides an assembled steel-concrete composite bridge, which includes a steel main beam and a concrete cantilever slab. The steel main beam includes: a steel main body part, a stud part extending from the upper part of the steel main body part, and a pin part arranged above the steel main body part. The concrete cantilever slab includes: a cantilever slab main body, and a steel bar part extending from one side of the cantilever slab main body into the stud part. The steel bar part is inserted into the stud part. A recessed internal reserved card slot is provided below the cantilever slab main body, and the pin part is inserted into the internal reserved card slot. The assembled steel-concrete composite bridge further includes a cast-in-place bridge deck layer poured between and above the steel main beam and the concrete cantilever slab.

[0010] Preferably, a slot is provided on one side of the cantilever slab main body close to the steel main body part, and the upper part of the steel main body part is inserted into the slot.

[0011] Preferably, the stud part includes a first row of studs and a second row of studs arranged side by side and at intervals along the width direction of the assembled steel-concrete composite bridge; the steel bar part includes a first row of steel bars and a second row of steel bars arranged side by side and at intervals along the height direction of the assembled steel-concrete composite bridge.

[0012] Preferably, the concrete cantilever slab is integrally rectangular block-shaped, and the concrete cantilever slab further includes a plurality of longitudinal steel bars extending from both ends of the cantilever slab main body respectively, and the extending direction of the longitudinal steel bars is perpendicular to the extending direction of the steel bar part.

[0013] Preferably, the steel main body part is integrally I-shaped, the upper part of the steel main body part is an upper flange plate, and the assembled steel-concrete composite bridge further includes a reinforcing steel bar. One end of the reinforcing steel bar is welded to the first row of steel bars, and the other end of the reinforcing steel bar extends below the upper flange plate.

[0014] Preferably, the pin part includes a steel hinge and a spring pin. The lower part of the steel hinge is welded to the steel main body part, a recessed accommodating groove is provided in the upper part of the steel hinge, and the spring pin includes a compression spring arranged in the accommodating groove and a pin block arranged above the compression spring.

[0015] Preferably, a guiding inclined surface is provided on one side of the pin block close to the cantilever slab main body.

[0016] Preferably, there are two sets of the pin parts arranged at intervals; the two sets of pin parts are respectively arranged at both ends of the second row of studs.

[0017] Preferably, the concrete cantilever slab is a precast slab, and a grouting ventilation hole extending into the internal reserved card slot is provided on the concrete cantilever slab.

[0018] The present invention also discloses a construction method for the prefabricated steel-concrete composite bridge as described above, which includes the following steps:

[0019] S1. Prefabricate the concrete middle slab, the concrete cantilever slab and the steel main beam in the factory, and weld the pin part to the steel main part;

[0020] S2. Hoist and install the steel main beam, and set up temporary lateral supports between the steel main beams. The steel main beam includes main beam fulcrums, and temporary anchoring devices are set at the positions of the main beam fulcrums;

[0021] S3. Install the prefabricated concrete middle slab;

[0022] S4. Install the concrete cantilever slab, and horizontally insert the cantilever slab body until the pin part is inserted into the internally reserved card slot, and the cantilever slab body is installed in place;

[0023] S5. Bind the steel bars of the cast-in-place layer of the bridge deck, arrange the transverse steel bars of the cast-in-place layer, and lap-weld the steel bars extending from the cantilever slab body with the transverse steel bars of the cast-in-place layer; after completion, an assembled combination part is formed;

[0024] S6. Cast concrete on the assembled combination part to form the cast-in-place layer of the bridge deck.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the beneficial effects of the prefabricated steel-concrete composite bridge and its construction method of the present invention mainly include:

[0027] By adopting the structure and construction method of the prefabricated steel-concrete composite bridge of the present invention, the problem of difficult on-site casting at the cantilever position of the bridge deck in the prefabricated steel-concrete composite bridge project can be effectively solved, and the standardization of the structure and the rapidization of the construction of the prefabricated steel-concrete composite bridge can be promoted. Description of the drawings

[0028] The features and advantages of the present invention will be more clearly understood by referring to the attached drawings. The drawings are schematic and should not be construed as any limitation to the present invention. In the drawings:

[0029] Figure 1 is the front view schematic diagram (after longitudinally sectioned) of the overall structure of the prefabricated steel-concrete composite bridge according to the embodiment of the present invention;

[0030] Figure 2 is the left view schematic diagram (after horizontally sectioned) of the overall structure of the prefabricated steel-concrete composite bridge according to the embodiment of the present invention;

[0031] Figure 3 is the exploded view of the overall structure of the prefabricated steel-concrete composite bridge according to the embodiment of the present invention;

[0032] Figure 4 A perspective view of the concrete cantilever slab in the prefabricated steel-concrete composite bridge according to an embodiment of the present invention;

[0033] Figure 5 A perspective view of the steel main beam in the prefabricated steel-concrete composite bridge according to an embodiment of the present invention;

[0034] Figure 6 A perspective view of the pin part in the prefabricated steel-concrete composite bridge according to an embodiment of the present invention (showing internal dotted lines);

[0035] Figure 7 A perspective view of the steel hinge in the prefabricated steel-concrete composite bridge according to an embodiment of the present invention;

[0036] Figure 8 A cross-sectional view of the perspective view of the concrete cantilever slab in the prefabricated steel-concrete composite bridge according to an embodiment of the present invention (not showing steel bars).

[0037] Explanation of reference numerals:

[0038] 1. Steel main beam, 2. Concrete cantilever slab, 3. Concrete middle slab, 4. Reinforcing steel bars, 11. Steel main body part, 12. First row of stud welds, 13. Second row of stud welds, 14. Pin part, 21. Cantilever slab main body, 22. First row of steel bars, 23. Second row of steel bars, 24. Longitudinal steel bars, 25. Grouting vent hole, 26. Internal reserved card slot, 27. Slot, 141. Steel hinge, 142. Compression spring, 143. Pin block, 1411. Accommodation groove, 1431. Inclined surface. Detailed implementation manners

[0039] To make the above objects, features and advantages of the present invention more apparent and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements, or a "transmission connection", that is, a power connection is carried out through various suitable methods such as belt drive, gear drive or sprocket drive. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] The following structure is attached Figure 1-8 A further description is made of an assembled steel-concrete composite bridge and its construction method according to the present invention.

[0042] An assembled steel-concrete composite bridge includes a steel main beam 1 and a concrete cantilever slab 2. The steel main beam 1 includes: a steel main body part 11, a stud part extending from the upper part of the steel main body part 11, and a pin part 14 arranged above the steel main body part 11. The concrete cantilever slab 2 includes: a cantilever slab main body 21, and a steel bar part extending from one side of the cantilever slab main body 21 into the stud part. The steel bar part is inserted into the stud part. A recessed internal reserved card slot 26 is provided below the cantilever slab main body 21, and the pin part 14 is inserted into the internal reserved card slot 26. The assembled steel-concrete composite bridge further includes a cast-in-place bridge deck layer poured between the steel main beam 1 and the concrete cantilever slab 2 and at the upper position.

[0043] More specifically, a slot is provided on one side of the cantilever slab main body 21 close to the steel main body part 11, and the upper part of the steel main body part 11 is inserted into the slot. That is, by thickening the root of the cantilever slab main body 21 of the concrete cantilever slab 2 and reserving a slot for the top plate of the steel main body to be inserted, a structure is formed in which the root of the cantilever slab main body 21 wraps around the top (upper flange plate) of the steel main body part 11.

[0044] More specifically, the pin part 14 includes a steel hinge 141 and a spring pin. The lower part of the steel hinge 141 is welded to the steel main body part 11. A recessed accommodating groove 1411 is provided in the upper part of the steel hinge 141. The spring pin includes a compression spring 142 arranged in the accommodating groove 1411 and a pin block 143 arranged above the compression spring 142.

[0045] A further description is made of the structure of the concrete cantilever slab 2. The first row of steel bars 22 and the second row of steel bars 23 in the concrete cantilever slab 2 both extend out of the cantilever slab main body 21 (concrete precast slab) and reserve a connection length. The stud part includes a plurality of studs arranged at intervals. During installation, the second row of steel bars 23 needs to be inserted longitudinally along the bridge and pass through the gaps between the studs. The second row of steel bars 23 needs to pass through the internal reserved card slot 26 on the cantilever slab main body.

[0046] The structure of the steel main beam 1 will be further described below. The steel main beam 1 includes: a steel main body part 11, a stud part extending from the upper part of the steel main body part 11, and a pin part 14 provided above the steel main body part 11. Among them: before installing the concrete cantilever slab 2 and the steel main beam 1, the steel hinge 141 and the stud part need to be welded to the steel main body part 11 respectively. The pin block 143 is connected to the steel hinge 141 as a whole through a compression spring 142. When installing the concrete cantilever slab 2, the cantilever slab main body 21 is inserted into the steel main beam 1 along the transverse direction of the bridge. The pin block 143 is retracted into the internal accommodation groove 1411 under the action of the concrete slab. After the concrete cantilever slab is installed in place, under the action of the spring, the pin pops out and is embedded in the internal reserved card slot 26 on the cantilever slab main body, forming a mechanical anchor to ensure that the cantilever slab main body 21 cannot slide out horizontally.

[0047] During construction and assembly, after the steel main beam 1 and the concrete middle slab 3 are installed in place, the concrete cantilever slab 2 is inserted into the side beam of the steel main beam 1 horizontally from the outside to the inside. When the pin part 14 reaches the predetermined position, the pin block 143 automatically inserts into the internal reserved card slot 26 on the concrete cantilever slab 2 to play a fixing role. Then, the remaining steel bars of the bridge deck are tied and the cast-in-place layer of the bridge deck is poured. In this embodiment, after the pin part 14 is inserted into the internal reserved card slot 26 and then after concrete pouring, it can ensure the close connection between the precast and cast-in-place concrete.

[0048] Using the structure of an assembled steel-concrete composite bridge of the present invention can effectively solve the problem of difficult cast-in-place of the bridge deck at the cantilever position of the existing assembled composite beam, effectively improve the construction convenience and safety of the assembled composite beam, with a clear stress mechanism, convenient construction, economic and practical, and is conducive to the standardized development of the assembled composite beam structure.

[0049] According to the specific embodiment of the present invention, the stud part includes a first row of studs 12 and a second row of studs 13 arranged side by side and at intervals along the width direction of the assembled steel-concrete composite bridge. The steel bar part includes a first row of steel bars 22 and a second row of steel bars 23 arranged side by side and at intervals along the height direction of the assembled steel-concrete composite bridge. Adopting this structure is beneficial to improving the overall strength of an assembled steel-concrete composite bridge of the present invention.

[0050] According to the specific embodiment of the present invention, the steel main body part 11 is integrally in an I-shaped shape. The upper part of the steel main body part 11 is an upper flange plate. The assembled steel-concrete composite bridge further includes a reinforcing steel bar 4. One end of the reinforcing steel bar 4 is welded to the first row of steel bars 22, and the other end of the reinforcing steel bar 4 extends under the upper flange plate. This structure is beneficial to improving the connection stability between the steel main body part 11 and the cantilever slab main body 21, and at the same time is beneficial to further improving the overall mechanical properties of an assembled steel-concrete composite bridge of the present invention.

[0051] According to a specific embodiment of the present invention, the concrete cantilever slab 2 is integrally in a rectangular block shape. The concrete cantilever slab 2 further includes a plurality of longitudinal steel bars 24 respectively extending from both ends of the cantilever slab main body 21, and the extending direction of the longitudinal steel bars 24 is perpendicular to the extending direction of the steel bar part. In this embodiment, the longitudinal steel bars 24 are used to connect the precast concrete and the cast-in-place concrete, which can further ensure the tightness of the connection between the precast and cast-in-place concrete.

[0052] According to a specific embodiment of the present invention, a guiding inclined surface 1431 is provided on one side of the plug block 143 close to the cantilever slab main body 21. This inclined surface 1431 facilitates the smooth insertion of the plug block 143 into the internally reserved card slot 26 on the cantilever slab main body.

[0053] According to a specific embodiment of the present invention, there are two sets of plug parts 14 arranged at intervals; the two sets of plug parts 14 are respectively arranged at both ends of the second row of welding studs 13. The internally reserved card slot 26 is a square slot, and both sets of plug parts 14 are inserted into the internally reserved card slot 26. This structure is beneficial to improving the stability of the connection.

[0054] In the above embodiment, the concrete cantilever slab 2 is precast, and the bridge deck cast-in-place layer is cast-in-place.

[0055] It should be noted that in the above embodiment, the concrete cantilever slab 2 is provided with grouting ventilation holes 25 extending into the internally reserved card slot 26. There are 2 grouting ventilation holes 25 arranged at intervals, which are used to provide an air outlet channel when grouting into the internally reserved card slot 26, facilitating the avoidance of casting defects and improving the casting quality. At the same time, the ventilation holes 25 can also be used as auxiliary casting holes to ensure the casting quality at the top of the reserved card slot 26.

[0056] The following specifically introduces a construction method of an assembled steel-concrete composite bridge according to the present invention, which includes the following steps:

[0057] S1. Precast the concrete middle slab 3, the concrete cantilever slab 2 and the steel main beam 1 in the factory, and weld the plug part 14 to the steel main body part 11.

[0058] S2. Lift and install the steel main beam 1, set up temporary transverse supports between the steel main beams 1, and the steel main beam 1 includes main beam supports, and set up temporary anchoring devices at the positions of the main beam supports.

[0059] S3. Install the precast concrete middle slab 3.

[0060] S4. Install the concrete cantilever slab 2, horizontally insert the cantilever slab main body 21 until the plug block 143 is inserted into the internally reserved card slot 26 of the cantilever slab main body 21, and the cantilever slab main body 21 is installed in place.

[0061] S5. Tie the steel bars of the cast-in-place layer of the bridge deck slab, arrange the transverse steel bars of the cast-in-place layer, and lap-weld the steel bars extending from the main body 21 of the cantilever slab with the transverse steel bars of the cast-in-place layer. After completion, an assembled combination part is formed.

[0062] S6. Pour the cast-in-place concrete of the steel hinge section, pour the cast-in-place concrete of the steel-concrete combined section, and pour the cast-in-place layer concrete of the composite bridge deck slab area.

[0063] More specifically, in step S6, the cast-in-place concrete is carried out in the following order: first pour the cast-in-place concrete of the steel hinge section, then pour the cast-in-place concrete of the steel-concrete combined section, and finally pour the cast-in-place layer concrete of the composite bridge deck slab area.

[0064] Wherein: The steel hinge section refers to the area around the pin part 14. The steel-concrete combined section refers to the area where steel and concrete are combined, specifically the area where the steel main body part 11, the main body 21 of the cantilever slab, and the concrete middle slab 3 are combined. The composite bridge deck slab area refers to the upper surface area of the overall structure after the steel main body part 11, the main body 21 of the cantilever slab, and the concrete middle slab 3 are combined.

[0065] Wherein: In step S4, when installing the concrete cantilever slab 2, insert the main body 21 of the cantilever slab horizontally until the pin block 143 pops up and inserts into the internal reserved slot 26 of the main body 21 of the cantilever slab, and the main body 21 of the cantilever slab is installed in place.

[0066] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An assembled steel-concrete composite bridge, characterized in that, It includes a steel main beam and a concrete cantilever slab. The steel main beam includes: a steel main body part, a stud part extending from the upper part of the steel main body part, and a pin part arranged above the steel main body part. The concrete cantilever slab includes: a cantilever slab main body, and a steel bar part extending from one side of the cantilever slab main body into the stud part. The steel bar part is inserted into the stud part. A recessed internal reserved card slot is provided below the cantilever slab main body. The pin part is inserted into the internal reserved card slot. The assembled steel-concrete composite bridge further includes a cast-in-place layer of the bridge deck poured between and above the steel main beam and the concrete cantilever slab; the pin part includes a steel hinge and a spring pin. The lower part of the steel hinge is welded to the steel main body part. A recessed accommodating groove is provided in the upper part of the steel hinge. The spring pin includes a compression spring arranged in the accommodating groove and a pin block arranged above the compression spring. A guiding inclined surface is provided on one side of the pin block close to the cantilever slab main body; the concrete cantilever slab is a precast slab, and a grouting vent hole extending into the internal reserved card slot is provided on the concrete cantilever slab.

2. The prefabricated steel-concrete composite bridge according to claim 1, characterized in that A slot is provided on one side of the cantilever slab main body close to the steel main body part, and the upper part of the steel main body part is inserted into the slot.

3. The prefabricated steel-concrete composite bridge according to claim 1, characterized in that, The stud part includes a first row of studs and a second row of studs arranged side by side and at intervals along the width direction of the assembled steel-concrete composite bridge; the steel bar part includes a first row of steel bars and a second row of steel bars arranged side by side and at intervals along the height direction of the assembled steel-concrete composite bridge.

4. The prefabricated steel-concrete composite bridge according to claim 3, characterized in that, The concrete cantilever slab is integrally in a rectangular block shape. The concrete cantilever slab further includes a plurality of longitudinal steel bars respectively extending from both ends of the cantilever slab main body. The extending direction of the longitudinal steel bars is perpendicular to the extending direction of the steel bar part.

5. The prefabricated steel-concrete composite bridge according to claim 4, characterized in that, The steel main body part is integrally in an I shape. The upper part of the steel main body part is an upper flange plate. The assembled steel-concrete composite bridge further includes a reinforcing steel bar. One end of the reinforcing steel bar is welded to the first row of steel bars, and the other end of the reinforcing steel bar extends below the upper flange plate.

6. The prefabricated steel-concrete composite bridge according to claim 5, characterized in that, Two sets of the pin parts are arranged at intervals; the two sets of the pin parts are respectively arranged at both ends of the second row of studs.

7. A construction method for an assembled steel-concrete composite bridge as described in any one of claims 1-6, characterized in that, It includes the following steps: S1, precast the concrete middle slab, the concrete cantilever slab and the steel main beam in the factory, and weld the pin part to the steel main body part; S2, hoist and install the steel main beam, set up temporary transverse supports between the steel main beams. The steel main beam includes main beam fulcrums, and set up temporary anchoring devices at the positions of the main beam fulcrums; S3, install the precast concrete middle slab; S4, install the concrete cantilever slab, horizontally insert the cantilever slab main body until the pin part is inserted into the internal reserved card slot, and the cantilever slab main body is installed in place; S5, bind the steel bars of the cast-in-place layer of the bridge deck, arrange the transverse steel bars of the cast-in-place layer, and lap-weld the steel bars extending from the cantilever slab main body with the transverse steel bars of the cast-in-place layer; after completion, an assembled combination part is formed; S6, cast concrete on the assembled combination part to form the cast-in-place layer of the bridge deck.

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