An assembled open-hole waffle deck girder structure

Abstract

The application belongs to the field of bridge engineering, and particularly relates to a kind of assembled open-hole waffle bridge deck slab I-beam structure, including UHPC I-shaped girder, UHPC waffle bridge deck slab with opening, cross diaphragm and shear connector, the top plate position of UHPC I-shaped girder is pre-embedded with bent reinforcement as shear connecting key during prefabrication, the prefabricated UHPC waffle bridge deck slab with opening is connected with I-shaped girder by pouring UHPC material at shear connecting key part, there are transverse joints and longitudinal joints between UHPC waffle bridge deck slab with opening, UHPC is poured at joint position for connection, in order to ensure the transverse connection between each girder, non-assembly cross diaphragm structure is used, the application uses the excellent tensile property and shear resistance of UHPC to reduce the beam height and self weight of structure, overcomes the easy cracking of traditional ordinary concrete bridge deck slab and improves the bonding property between beam and slab.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated highway bridge engineering construction, in particular to a prefabricated open-hole waffle bridge deck slab I-beam structure. BACKGROUND

[0002] The main reason for the common diseases of ordinary concrete beam bridge deck slabs is that the self-weight of the upper concrete structure is too large and tensile stress is generated under repeated vehicle loads, causing cracking, which seriously affects the safety and durability of the bridge deck slab structure and becomes a technical problem that needs to be solved urgently for bridge structures.

[0003] UHPC material is used to build bridge structures as a new type of cement-based composite material with ultra-high strength, ultra-high toughness and ultra-high durability to improve the self-weight problem of the upper structure and the cracking problem of the bridge deck slab. Because the strength of UHPC is much higher than that of ordinary concrete, the thickness of the UHPC bridge deck slab is much smaller than that of the ordinary concrete bridge deck slab under the same load, resulting in a decrease in the interface stiffness of the bridge deck slab structure. The UHPC waffle bridge deck slab with pre-tensioned prestressed tendons can fully utilize the excellent mechanical properties of UHPC material and ensure the cross-sectional stiffness of the bridge deck slab.

[0004] In view of the poor durability problems such as sagging at the mid-span position of the ordinary concrete I-beam and cracking of the web, the good tensile properties and durability of UHPC are used to solve the cracking problems of the I-beam and the bridge deck slab.

[0005] The UHPC I-beam is used for the main beam to solve the self-weight problem of the bridge upper structure, and the UHPC material is used to fill the pre-buried shear key between the I-beam and the bridge deck slab to ensure the bonding performance between the beam and the slab.

[0006] PATENT CONTENT

[0007] The purpose of the present application is to provide a prefabricated open-hole waffle bridge deck slab I-beam structure. The waffle bridge deck slab structure with notches and the I-beam structure with shear connection keys are prefabricated in the factory. Only the main beam and the bridge deck slab structure need to be hoisted and the notches and the cross diaphragm are poured at the same time on site to avoid secondary pouring, making the construction process simple, reducing the overall construction difficulty of the project, and ensuring the construction quality and efficiency of the bridge upper structure.

[0008] To achieve the above-mentioned purpose, the present application provides the following scheme:

[0009] The present application provides a prefabricated open-hole waffle bridge deck slab I-beam structure, which comprises an I-beam structure, and the upper surface of the I-beam structure is uniformly paved with a waffle bridge deck slab.

[0010] The I-beam structure comprises a plurality of uniformly laid I-shaped main beams, two adjacent main beams are connected by a cross partition plate, both sides of the main beam are provided with notches during prefabrication, and the cross partition plate is connected with the main beam through the notches;

[0011] The upper surface of the main beam is pre-embedded with a shear connector during prefabrication, the shear connector is made of curved steel bars, the wafer bridge deck is connected with the main beam through the shear connector, and transverse joints and longitudinal joints are left between the wafer bridge decks.

[0012] Further, the main beam, the cross partition plate and the wafer bridge deck are all prefabricated by UHPC.

[0013] Further, the wafer bridge deck surface is provided with a slot hole, the position of the slot hole corresponds to the position of the pre-embedded shear connector of the main beam, and the slot hole close to the notch is in communication with the notch for pouring of UHPC concrete.

[0014] Further, the cross partition plate comprises a cross beam, T-shaped steel plates are pre-embedded at both ends of the cross beam during prefabrication, a plurality of reserved holes are formed in the T-shaped steel plates, and the main beam and the cross partition plate have good bonding performance.

[0015] Further, the cross beam is externally sleeved with two rubber plates, the rubber plates are movably connected to the outside of the cross beam and are bonded to the outside of the notches on the left and right sides of the main beam by high-strength bonding glue, so that the notch forms a closed chamber with an open top.

[0016] Further, the contact position between the inside of the notch and the T-shaped steel plate is roughened, and the roughening is processed by any one of a prefabricated groove, a notched groove and a roughening process, so as to increase the bonding performance between the cross partition plate structure and the main beam.

[0017] Further, a groove is formed in the main beam at the bottom of the shear connector, and the groove at the upper end of the notch is in communication with the notch, so as to facilitate the flow of UHPC concrete into the inside of the notch during pouring.

[0018] An assembled open-hole wafer bridge deck I-beam structure, and the construction method comprises the following steps:

[0019] 1) After the prefabricated UHPC main beam with a shear connector is hoisted and positioned, a prefabricated UHPC cross partition plate structure is hoisted;

[0020] 2) The cross partition plate is installed in the inside of the notch between the two main beams, the rubber plate is pulled, and the rubber plate is bonded to the outside of the notches on the left and right sides of the main beam by high-strength bonding glue, so that the notch forms a closed chamber with an open top;

[0021] 3) Then, the prefabricated UHPC wafer bridge deck with a slot hole is hoisted on the main beam;

[0022] 4), the UHPC concrete is used to realize pouring of the transverse joint and the longitudinal joint of the waffle bridge deck, and the notches of the main beam and the notches of the waffle bridge deck are filled through the notches on the waffle bridge deck;

[0023] 5), after the pouring is completed, the bridge expansion joint is installed, the bridge waterproof layer is arranged, and the asphalt concrete oil surface is paved, and then the bridge can be put into use.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] 1, compared with the traditional prestressed concrete I-beam structure, the assembled UHPC waffle bridge deck I-beam structure fully utilizes the excellent compressive and tensile properties of UHPC material, reduces the beam height and the self weight of the structure, can be prefabricated and assembled, shortens the construction period of the structure, and overcomes the disadvantages of the traditional ordinary concrete I-beam structure.

[0026] 2, the overall superstructure of the assembled UHPC waffle bridge deck structure adopts prefabricated assembly, which saves the process of cast-in-place layer on the bridge deck, greatly improving the construction progress.

[0027] 3, compared with the ordinary concrete bridge deck, the cross-sectional size and self weight of the UHPC bridge deck structure are greatly reduced, but the UHPC bridge deck has the disadvantage of too low interface stiffness, and the pre-tensioning prestressed waffle bridge deck can avoid the disadvantages of the ordinary concrete structure and durability and the too low stiffness of the UHPC bridge deck.

[0028] 4, the connection between the waffle bridge deck and the I-beam adopts the I-shaped main beam with shear connectors and the prestressed UHPC waffle bridge deck with notches, which are connected by pouring UHPC grouting material at the notch part, so that the bonding performance between the beam and the plate is excellent.

[0029] 5, the connecting part between the diaphragm and the main beam can be poured through the notches of the bridge deck, and the connection between the main beam and the bridge deck is poured immediately after pouring at the diaphragm part, which can avoid the secondary pouring of the overall structure and save a construction process. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 It is an assembled open-waffle bridge deck assembly structure schematic diagram.

[0032] Figure 2 Assembled open hole waffle bridge deck slab H-beam structure schematic diagram is shown;

[0033] Figure 3 As shown is the structure schematic diagram of the cross diaphragm;

[0034] Figure 4 As shown is the prestressed H-beam structure schematic diagram with shear connectors;

[0035] Figure 5 As shown is Figure 4 The structure schematic diagram in A of the figure.

[0036] In the figure: 1-H-beam, 11-main beam, 111-groove, 112-shear connector, 113-bottom groove, 12-cross diaphragm, 121-T-shaped steel plate, 122-rubber plate, 123-cross beam, 2-waffle bridge deck slab; Specific implementation method

[0037] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0038] In view of the problems of poor durability caused by the sagging of the ordinary concrete H-beam at the midspan position and the cracking of the web, and the problem of excessive self-weight of the ordinary concrete bridge deck slab structure, the good tensile property and durability of UHPC are used to solve the cracking problems of the H-beam and the bridge deck slab. The purpose of the present application is to provide an assembled waffle bridge deck slab H-beam structure and a construction method thereof, so as to solve the problems existing in the prior art, reduce the beam height and the self-weight, and realize prefabricated assembly, short construction period, high economy of the bridge, and low maintenance cost in the later operation.

[0039] Based on the above theory, the present application provides an assembled open hole waffle bridge deck slab H-beam structure, which has the structure as shown in the figure. Figures 1-5 The structure includes H-beam structure 1, and the upper surface of the H-beam structure 1 is uniformly paved with waffle bridge deck slab 2.

[0040] The H-beam structure 1 includes a plurality of uniformly paved H-shaped main beams 11, and every two adjacent main beams 11 are connected through cross diaphragms 12. The two sides of the main beam 11 are provided with grooves 111 during prefabrication, and the cross diaphragm 12 is connected with the main beam 11 through the groove 111.

[0041] The upper surface of the main beam 11 is pre-embedded with a shear connector 112 made of bent steel bars when prefabricated, and the waffle deck 2 is connected to the main beam 11 through the shear connector 112, and transverse joints and longitudinal joints are left between the waffle decks 2.

[0042] The main beam 11, the cross diaphragm 12 and the waffle deck 2 are all prefabricated by UHPC.

[0043] Preferably, as shown in Figure 1 The waffle deck 2 is provided with a slot hole on the surface, and the position of the slot hole corresponds to the position of the shear connector 112 embedded in the main beam 11, wherein the slot hole near the slot 111 is in communication with the slot 111 for pouring UHPC concrete.

[0044] Preferably, as shown in Figure 3 The cross diaphragm 12 includes a cross beam 123, and a T-shaped steel plate 121 is pre-embedded at both ends of the cross beam 123 when prefabricated, and a plurality of reserved holes are formed in the T-shaped steel plate 121 to enable good bonding between the main beam 1 and the cross diaphragm 12.

[0045] Preferably, as shown in Figure 3 The cross beam 123 is externally sleeved with two rubber plates 122, which are movably connected to the outside of the cross beam 123 and are bonded to the outside of the slot 111 on both sides of the main beam 11 by high-strength adhesive glue, so that the slot 111 forms a closed chamber with an open top.

[0046] Preferably, as shown in Figure 5 The contact position between the inside of the slot 111 and the T-shaped steel plate 121 is roughened, which is processed by any one of prefabricated grooves, grooving and chiseling, to increase the bonding performance between the cross diaphragm 12 structure and the main beam 11.

[0047] Preferably, as shown in Figure 4 The bottom of the shear connector 112 is provided with a groove on the main beam 11, and the groove at the upper end of the slot 111 is in communication with the slot 111, which facilitates the flow of UHPC concrete into the inside of the slot 111 during pouring.

[0048] The construction method comprises the following steps: after the prefabricated UHPC main beam 11 is hoisted in place, the prefabricated UHPC transverse plate 12 structure is hoisted, the transverse plate 12 is installed in the notches 111 between the two main beams 11, the rubber plate 122 is pulled, and the notches 111 are bonded outside the notches 111 on the left and right sides of the main beam 11 by means of high-strength bonding glue, so that the notches 111 form closed chambers with open tops, then the prefabricated UHPC waffle bridge deck 2 with notches is hoisted on the prefabricated main beam 11 with the shear connector 112, then the UHPC concrete is used to realize pouring of the transverse joints and the longitudinal joints of the waffle bridge deck 2, the notches 111 of the main beam 11 and the notches of the waffle bridge deck 2 are filled through the notches of the waffle bridge deck 2, after pouring is completed, the bridge expansion joint is installed, the bridge waterproof layer is arranged, and the asphalt concrete oil surface is paved, and then the bridge can be put into use.

[0049] It should be noted that the main beam 11 is poured on a special pretensioning method pedestal, the shear connector 112 is embedded on the top of the main beam 11 before pouring, high-temperature steam curing is adopted, the strength reaches 90% of the design strength, and the age period is not less than 7d, and then the symmetric stress steel strands are tensioned, and then the natural condition curing is carried out for 28d.

[0050] Secondly, the prefabricated assembly type UHPC waffle bridge deck is installed, the waffle bridge deck formwork with notches is installed, the prestressed steel bars are tensioned, the steel mesh is laid, and then the UHPC ultra-high performance concrete is poured, and the UHPC ultra-high strength concrete in the formwork is vibrated, compacted and uniformly distributed. When the UHPC material reaches a certain strength, the formwork is removed and cured until the design strength.

[0051] In order to make the shear connector 112 correspond to the position of the notch 111, it is required that the assembly type UHPC waffle bridge deck 2 reserves the steel bars to be arranged at equal intervals with the shear connector 112 on the main beam 11.

[0052] Overall, the assembly type open-hole waffle bridge deck I-beam structure of the present application fully plays the structural stress characteristics of the UHPC waffle bridge deck and the pretensioning method prestressed UHPC I-beam, adopts the connection form of the cluster type notch shear key and the assembly-free transverse plate structure, so that the bridge superstructure has the advantages of light self weight, convenient construction, few joints, excellent durability and the like, can adapt to the development needs of the assembly type bridge structure, and can resist the durability of concrete in special environments, thereby significantly reducing the whole life operation and maintenance cost.

[0053] It is to be understood that the application is not limited to the details of the above-exemplified embodiments and that the present application can be carried out in other concrete ways without departing from the spirit or essential characteristics of the application. Consequently, all changes and modifications that can suggest themselves to one skilled in the art have to be seen as being within the scope of the present application as defined by the following claims. The embodiments are to be considered in all respects as illustrative only and not restrictive of the application described and claimed herein. The application is therefore not to be limited to the specific embodiments described herein, but only by the scope of the appended patent claims and their equivalents.

[0054] The above examples are illustrative of the principles and embodiments of the application. They are not meant to limit the scope of the application, which is defined by the claims. The application is not limited to the specific details described herein.

Claims

1. A fabricated open-web waffle deck girder bridge structure, characterized by: The I-beam structure is uniformly paved with the waffle deck on the upper surface; The I-beam structure comprises a plurality of uniformly paved I-shaped main beams, two adjacent main beams are connected by a cross diaphragm, both sides of the main beam are notched during prefabrication, and the cross diaphragm is connected with the main beam through the notch; The upper surface of the main beam is pre-embedded with a shear connector during prefabrication, the shear connector is made of bent steel bars, the waffle deck is connected with the main beam through the shear connector, and transverse joints and longitudinal joints are left between the waffle decks; The cross diaphragm comprises a cross beam, T-shaped steel plates are pre-embedded at both ends of the cross beam during prefabrication, a plurality of reserved holes are formed in the T-shaped steel plates, and the main beam and the cross diaphragm have good bonding performance; Two rubber plates are sleeved outside the cross beam, the rubber plates are movably connected outside the cross beam and are bonded to the outside of the notches on both sides of the main beam through high-strength adhesive glue, so that the notches form a closed chamber with an open top; A groove is formed in the bottom of the shear connector on the main beam, and the groove at the upper end of the notch is communicated with the notch, so that the UHPC concrete can flow into the notch during pouring.

2. A fabricated open-web waffle deck girder structure as defined in claim 1, wherein: The main beam, the cross diaphragm and the waffle deck are all prefabricated by UHPC.

3. A prefabricated waffle deck girder structure as claimed in claim 1, wherein: The waffle deck is provided with a slot hole, the position of the slot hole corresponds to the position of the shear connector pre-embedded in the main beam, the slot hole close to the notch is communicated with the notch, and the UHPC concrete is poured.

4. A prefabricated waffle deck girder structure as claimed in claim 1, wherein: The contact position between the notch and the T-shaped steel plate is roughened, the roughening is processed by any one of prefabrication, grooving and chiseling, and the bonding performance between the cross diaphragm structure and the main beam is improved.

5. The prefabricated open-waffle deck I-beam structure according to any one of claims 1-4, wherein the construction method comprises the following steps: 1) after the prefabricated UHPC main beam with the shear connector is hoisted and positioned, the prefabricated UHPC cross diaphragm structure is hoisted; 2) the cross diaphragm is installed in the notch between the two main beams, the rubber plate is pulled, and the high-strength adhesive glue is bonded to the outside of the notches on both sides of the main beam, so that the notch forms a closed chamber with an open top; 3) then, the prefabricated UHPC waffle deck with a slot hole is hoisted on the main beam; 4) the UHPC concrete is used to pour the transverse joints and the longitudinal joints of the waffle deck, and the notch of the main beam and the slot hole of the waffle deck are filled through the slot hole of the waffle deck; 5) after the pouring is completed, the bridge expansion joint is installed, the bridge waterproof layer is set, and the asphalt concrete oil surface is paved, and then the bridge can be put into use.

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