Segment precast and assembled composite beam connected by self-locking sleeve and construction method

Abstract

The present invention discloses a segment precast and assembled composite beam connected by a self-locking sleeve and a construction method thereof, which includes a steel beam and a precast bridge deck. A plurality of shear connectors are provided on the steel beam; corresponding to the shear connectors, bottom plate notches are provided under the precast bridge deck; a number of bottom plate transverse steel bars are arranged in the bottom plate notches; connection notches are provided on one side where two adjacent precast bridge decks are connected; the connection notches are provided with end plate notches and connecting steel bars; the connecting steel bars in each pair of connection notches are connected by a self-locking sleeve; each precast bridge deck and the steel beam are fixed by cast-in-place concrete in the connection notches; exhaust holes are provided between the upper surface of each precast bridge deck and the corresponding bottom plate notch. During construction, each precast bridge deck is sequentially installed on the steel beam through a self-locking sleeve, and then fixed by cast-in-place concrete in the connection notches. The present invention enables the precast and assembled composite beam to have more reliable connection performance, higher prefabrication degree and more convenient construction steps.

Description

Technical Field

[0001] The present invention relates to the technical field of composite beam construction, and particularly to a segment precast and assembled composite beam connected by a self-locking sleeve and a construction method thereof. Background Art

[0002] The prefabricated bridge structure is conducive to ensuring the project quality, accelerating the project progress, and reducing the impact of the construction process on traffic and the environment, and has good social and economic benefits.

[0003] The steel-concrete composite structure bridge combines the material characteristics of steel in tension and concrete in compression, and has the advantages of high structural performance and strong spanning ability. Currently, it is widely used in the fields of municipal bridges, highway bridges, etc.

[0004] In the existing prefabricated steel-concrete composite beam bridge technology, precast concrete slabs with half-height or full-height are mostly used for assembly connection.

[0005] For the half-height precast concrete composite slab technology, it is necessary to bind the upper steel bars of the bridge deck on site and connect them with the post-cast concrete composite layer, which has the disadvantages of large construction workload and low degree of prefabrication. The full-height precast concrete bridge deck usually uses the grooved stud technology for connection. The shear studs are unevenly arranged along the longitudinal direction of the bridge, and the connection performance is poor. At the same time, the longitudinal and transverse directions of the segmented full-height precast bridge deck are usually connected by wet joints, which also have problems such as large on-site construction workload and difficult construction.

[0006] Therefore, how to improve the connection performance, the degree of prefabrication of the precast and assembled composite beam and make the construction more convenient has become an urgent technical problem to be solved by those skilled in the art. Summary of the Invention

[0007] In view of the above-mentioned defects of the prior art, the present invention provides a segment precast and assembled composite beam connected by a self-locking sleeve and a construction method thereof, and the purpose achieved is to make the precast and assembled composite beam have a more reliable bearing capacity, a higher degree of prefabrication and more convenient construction steps.

[0008] To achieve the above purpose, the present invention discloses a segment precast and assembled composite beam connected by a self-locking sleeve, including one or more parallel steel beams, and a plurality of precast bridge decks arranged along the length direction of the steel beam.

[0009] Wherein, each of the steel beams is provided with a plurality of shear connectors along the length direction;

[0010] Below each of the precast bridge decks, corresponding to the plurality of shear connectors, there are provided bottom plate notches extending along the corresponding steel beam and penetrating through;

[0011] In each of the bottom grooves of the slabs, a number of transverse bottom bars perpendicular to the length direction of the steel beam are arranged along the length direction of the steel beam;

[0012] On one side where every two adjacent precast bridge slabs are joined, there are matching connecting grooves;

[0013] Each of the connecting grooves is provided with an end groove of the slab and connecting bars;

[0014] The connecting bars in each pair of the connecting grooves are connected through self-locking sleeves;

[0015] Each of the self-locking sleeves includes a self-locking sleeve concave head and a self-locking sleeve convex head;

[0016] Each of the self-locking sleeve concave heads is provided with a steel pin with a clamping groove;

[0017] Each of the self-locking sleeve convex heads is provided with a pin hole with a spring clip;

[0018] Between each precast bridge slab and the two steel beams, it is fixed by casting concrete in place from the corresponding connecting grooves;

[0019] Between the upper surface of each precast bridge slab and the corresponding bottom groove of the slab, there are vertically penetrating exhaust holes.

[0020] Preferably, each of the steel beams is an I-beam or a box girder; each of the shear connectors is a stud connector or a channel steel connector; each of the precast bridge slabs is a bridge slab with a bearing or a bridge slab without a bearing; the cast-in-place concrete uses ordinary concrete, ultra-high performance concrete or fiber-reinforced concrete.

[0021] Preferably, a sealing rubber pad is provided between each precast bridge slab and the corresponding steel beam.

[0022] Preferably, an interface adhesive is provided between one side where every two adjacent precast bridge slabs are joined.

[0023] Preferably, each steel pin and the corresponding self-locking sleeve concave head are connected by an adjusting thread, and a rotation adjusting part is provided for rotating and adjusting the distance between each steel pin and the corresponding self-locking sleeve concave head.

[0024] Preferably, a positioning steel plate is provided at the position where the upper surface of the steel beam is joined to the corresponding connecting groove.

[0025] The present invention also provides a construction method for a segment precast and assembled composite beam connected by a self-locking sleeve, including the following steps:

[0026] Step 1: Install and erect the steel beam, and shear connectors are arranged on the steel beam;

[0027] Step 2: Install a sealing rubber pad and a positioning steel plate on the steel beam;

[0028] Step 3: Hoist and position the first precast bridge deck;

[0029] Step 4: Install a self-locking sleeve socket or a self-locking sleeve projection on one side of the precast bridge deck that needs to be connected to the next precast bridge deck after hoisting is completed, and then apply an interface adhesive;

[0030] Step 5: Hoist the next precast bridge deck to one side of the previous precast bridge deck, and install another set of the self-locking sleeve projections or the other set of the self-locking sleeve sockets that match the previous precast bridge deck on one side that needs to be connected to the previous precast bridge deck;

[0031] Insert the self-locking sleeve projection and the self-locking sleeve socket into each self-locking sleeve, and correct the deviation of the embedded connecting main reinforcement by rotating the adjustment part to make the assembly error of the bridge deck meet the standard and generate a pre-pressure between adjacent concrete slabs;

[0032] Step 6: Repeat Steps 4 and 5 until the installation of all the precast bridge decks is completed;

[0033] Step 7: Pour post-cast concrete from the connection notch to complete the fixation between all the precast bridge decks and the steel beam.

[0034] Preferably, in Step 1, the steel beam is installed in the form of direct hoisting, bolt splicing or welding.

[0035] Advantages of the present invention:

[0036] The application of the present invention can make the precast assembled composite beam have more reliable connection performance, higher degree of prefabrication and more convenient construction.

[0037] The following will further illustrate the concept, specific structure and technical effects of the present invention with reference to the accompanying drawings to fully understand the purpose, features and effects of the present invention. Description of the Drawings

[0038] Figure 1 A three-dimensional structural schematic diagram showing an embodiment of the present invention.

[0039] Figure 2 An end face structural schematic diagram showing an embodiment of the present invention.

[0040] Figure 3 Showing an embodiment of the present invention Figure 2 A partial enlarged structural schematic diagram at A in the embodiment.

[0041] Figure 4Shows the structural schematic diagram under the precast bridge deck in an embodiment of the present invention.

[0042] Figure 5 Shows the structural schematic diagram at the connection of two connection notches in an embodiment of the present invention.

[0043] Figure 6 Shows the structural schematic diagram of the self-locking sleeve in an embodiment of the present invention. Detailed implementation manners

[0044] Embodiment

[0045] As Figures 1 to 5 shown, the segment precast and assembled composite beam connected by the self-locking sleeve includes one or more steel beams 1 arranged in parallel, and a plurality of precast bridge decks 2 arranged along the length direction of the two steel beams 1. Each steel beam 1 is provided with a plurality of shear connectors 3 along the length direction;

[0046] Under each precast bridge deck 2 corresponding to the corresponding plurality of shear connectors 3, there is a bottom plate notch 6 extending along the corresponding steel beam 1 and penetrating through;

[0047] In each bottom plate notch 6, a number of bottom plate transverse steel bars 22 perpendicular to the length direction of the steel beam 1 are arranged along the length direction of the steel beam 1;

[0048] On one side where every two adjacent precast bridge decks 2 are joined, there are matching connection notches 4;

[0049] Each connection notch 4 is provided with a plate end notch 41 and a connecting steel bar 42;

[0050] The connecting steel bars 42 in each pair of connection notches 4 are connected through a self-locking sleeve 43;

[0051] Each self-locking sleeve 43 includes a self-locking sleeve concave head 44 and a self-locking sleeve convex head 45;

[0052] Each self-locking sleeve concave head 44 is provided with a steel pin 452 with a clamping groove 454;

[0053] Each self-locking sleeve convex head 45 is provided with a pin hole with a spring clip 441;

[0054] Between each precast bridge deck 2 and the steel beam 1, it is fixed by cast-in-place concrete from the corresponding connection notch 4;

[0055] Between the upper surface of each precast bridge deck 2 and the corresponding bottom plate notch 6, there is a vertically penetrating exhaust hole 23.

[0056] In practical applications, the bottom plate transverse steel bars 22 arranged in the bottom plate notch 6 can ensure the reliability of the post-cast connection.

[0057] Each pair of connecting steel bars 42 is connected by a self-locking sleeve 43. By inserting the self-locking sleeve convex head 45 into the self-locking sleeve concave head 44 at the corresponding position, the spring clip 441 is engaged with the card slot 454 to generate an anti-pulling self-locking force.

[0058] Multiple exhaust holes 23 can be provided according to actual requirements to ensure the compactness of pouring.

[0059] In some embodiments, the steel beam 1 is an I-beam or a box girder; the shear connector 3 is a stud connector or a channel steel connector; the precast bridge deck 2 is a bridge deck with a bearing or a bridge deck without a bearing; the cast-in-place concrete is ordinary concrete, ultra-high performance concrete or fiber-reinforced concrete.

[0060] A sealing rubber pad 7 is provided between the precast bridge deck and the corresponding steel beam 1.

[0061] Positioning steel plates 8 are provided at both ends of the steel beam 1.

[0062] In practical applications, the presence of the positioning steel plates 8 can ensure that the concrete slab does not displace during the installation and construction process.

[0063] In some embodiments, an interface adhesive 5 is provided between the adjacent sides of every two adjacent precast bridge decks 2.

[0064] As Figure 6 shown, in some embodiments, each steel pin 452 is connected to the corresponding self-locking sleeve concave head 44 by an adjusting thread, and a rotation adjusting part 453 is provided for rotating and adjusting the distance between each steel pin 452 and the corresponding self-locking sleeve concave head 44.

[0065] In practical applications, the rotation adjusting part 453 can make the two connecting steel bars 42 connected at both ends of the self-locking sleeve 43 generate a pre-tightening force against tension, generate a pre-compressive stress on the concrete connection surface, make the connection more reliable, and prevent phenomena such as water leakage and damage at the joint during operation.

[0066] The present invention also provides a construction method for a segment precast assembled composite beam connected by a self-locking sleeve, including the following steps:

[0067] Step 1, install and erect the steel beam 1, and shear connectors 3 are provided on the steel beam 1;

[0068] Step 2, install the sealing rubber pad 7 and the positioning steel plate 8 on the steel beam 1;

[0069] Step 3, hoist and place the first precast bridge deck 2 in place;

[0070] Step 4: Install a self-locking sleeve recess 44 or a self-locking sleeve protrusion 45 on one side of the precast bridge deck 2 that has been hoisted and needs to be connected to the next precast bridge deck 2, and then apply the interface adhesive 5.

[0071] Step 5: Hoist the next precast bridge deck 2 to one side of the previous precast bridge deck 2, and install another set of self-locking sleeve protrusions 45 or another set of self-locking sleeve recesses 44 that match the previous precast bridge deck 2 on the side that needs to be connected to the previous precast bridge deck 2.

[0072] Insert the self-locking sleeve protrusion 45 and the self-locking sleeve recess 44 into each self-locking sleeve 43, and correct the deviation of the embedded connecting main reinforcement by rotating the adjustment part 453 to make the assembly error of the bridge deck meet the standard and generate a pre-pressure between adjacent concrete slabs.

[0073] Step 6: Repeat Step 4 and Step 5 until the installation of all precast bridge decks 2 is completed.

[0074] Step 7: Pour the post-cast concrete from the connecting notch 4 to complete the fixation between all precast bridge decks 2 and the steel beam 1.

[0075] In some embodiments, in Step 1, the steel beam 1 is installed in the form of direct hoisting, bolt splicing or welding.

[0076] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. A segment precast and assembled composite beam using a self-locking sleeve connection, comprising one or more parallel steel beams (1), and a plurality of precast bridge decks (2) arranged along the length direction of the steel beam (1); characterized in that, On each of the steel beams (1), a plurality of shear connectors (3) are provided along the length direction; Below each of the precast bridge decks (2), corresponding to the plurality of the shear connectors (3), a bottom plate notch (6) extending along and penetrating the corresponding steel beam (1) is provided; In each of the bottom plate notches (6), a number of bottom plate transverse steel bars (22) perpendicular to the length direction of the steel beam (1) are arranged along the length direction of the steel beam (1); On one side where every two adjacent precast bridge decks (2) are joined, matching connecting notches (4) are provided; Each of the connecting notches (4) is provided with a plate end notch (41) and connecting steel bars (42); The connecting steel bars (42) in each pair of the connecting notches (4) are connected through a self-locking sleeve (43); Each of the self-locking sleeves (43) includes a self-locking sleeve concave head (44) and a self-locking sleeve convex head (45); In each of the self-locking sleeve concave heads (44), a steel pin (452) with a card slot (454) is provided; In each of the self-locking sleeve convex heads (45), a pin hole with a spring clip (441) is provided; Between each precast bridge deck (2) and the two steel beams (1), it is fixed by casting concrete in place from the corresponding connecting notch (4); Between the upper surface of each precast bridge deck (2) and the corresponding bottom plate notch (6), a vertically penetrating exhaust hole (23) is provided; Each of the steel beams (1) is an I-beam or a box girder; each of the shear connectors (3) is a stud connector or a channel steel connector; each of the precast bridge decks (2) is a bridge deck with a bearing or a bridge deck without a bearing; the cast-in-place concrete uses ordinary concrete, ultra-high performance concrete or fiber-reinforced concrete; A sealing rubber pad (7) is provided between each precast bridge deck (2) and the corresponding steel beam (1); an interface adhesive (5) is provided between one side where every two adjacent precast bridge decks (2) are joined; Each steel pin (452) is connected to the corresponding self-locking sleeve concave head (44) through an adjusting thread, and a rotation adjusting part (453) for rotating and adjusting the distance between each steel pin (452) and the corresponding self-locking sleeve concave head (44) is provided; At the position where the upper surface of the steel beam (1) is joined to the corresponding connecting notch (4), a positioning steel plate (8) is provided.

2. The construction method of the segment precast and assembled composite beam connected by a self-locking sleeve according to claim 1, characterized in that, It includes the following steps: Step 1, install and erect the steel beam (1), and the shear connector (3) is arranged on the steel beam (1); Step 2, install the sealing rubber pad (7) and the positioning steel plate (8) on the steel beam (1); Step 3, hoist and place the first precast bridge deck (2) in place; Step 4, install the self-locking sleeve concave head (44) or the self-locking sleeve convex head (45) on one side of the precast bridge deck (2) that needs to be joined to the next precast bridge deck (2) after the hoisting is completed, and then apply the interface adhesive (5); Step 5: Hoist the next precast bridge deck (2) to one side of the previous precast bridge deck (2), and install another set of the self-locking sleeve bosses (45) or another set of the self-locking sleeve recesses (44) that match the previous precast bridge deck (2) on the side that needs to be connected to the previous precast bridge deck (2). Insert the self-locking sleeve bosses (45) and the self-locking sleeve recesses (44) into each self-locking sleeve (43), and correct the deviation of the embedded connecting main reinforcement through the rotation adjustment part (453) to make the assembly error of the bridge deck meet the standard and generate pre-pressure between adjacent concrete slabs. Step 6: Repeat Steps 4 and 5 until the installation of all the precast bridge decks (2) is completed. Step 7: Pour post-cast concrete from the connecting notch (4) to complete the fixation between all the precast bridge decks (2) and the steel beam (1).

3. The construction method of the segment precast and assembled composite beam connected by a self-locking sleeve according to claim 2, characterized in that In Step 1, the steel beam (1) is installed in the form of direct hoisting, bolt splicing or welding.

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