CN217974039U - Bridge deck structure - Google Patents

Abstract

The utility model discloses a decking structure, include: the prefabricated slab comprises an upper layer and a lower layer, wherein the upper layer is a cast-in-place concrete slab, the lower layer comprises a plurality of prefabricated slabs, the prefabricated slabs are plain concrete slabs, edge-covered section steel is arranged on at least two slab edges of the prefabricated slabs along the transverse bridge direction, the thickness of each prefabricated slab is 2-4 cm, and the prefabricated slabs are concrete members with the compressive strength of more than or equal to 150MPa and the bending tensile strength of more than or equal to 20 MPa. The utility model discloses a decking structure is through using the high tenacity concrete that excels in and the shaped steel technique of borduring, realized reducing the thickness of precast slab to 2-4 centimetres, through the reduction of precast slab thickness, the cast in situ concrete plate thickness on upper strata has been increased, cast in situ concrete plate's cross-sectional height has been increased promptly, thereby cast in situ concrete plate's bearing capacity has been improved, and then the structural rigidity and the structural strength of combination formula decking have been improved, make its whole bearing capacity promote, prevent that the decking from ftracturing, the safety of bridge has been guaranteed.

Description

A bridge deck structure

technical field

The utility model relates to the technical field of bridge decks, in particular to a bridge deck structure.

Background technique

The main structure of the bridge includes piers, cap girders, main girders, and bridge decks. The bridge deck is an important force-bearing component. The bridge deck includes a combined bridge deck. There are two types of prefabricated bottom slabs: prefabricated steel plates and prefabricated concrete slabs. Prefabricated steel plates involve multiple professional processes such as steel structure welding, installation, and anti-corrosion, which makes the construction process of prefabricated steel plates for prefabricated bottom plates complicated and long. And the cost of steel is high; while traditional prefabricated concrete slabs generally use reinforced concrete slabs, the thickness of the structure that meets the requirements of bearing capacity and stiffness is more than 5 cm, or even 10 cm, and the structure is heavy and difficult to install. Combined with the prefabricated main girder of equal height, it is difficult to form the transverse slope required by the design, and the transverse slope can only be adjusted through the cast-in-place concrete slab. When the transverse slope is large, the two adjacent prefabricated steel bars The thickness of the cast-in-place concrete slab at the joint of the concrete slab is less than 3 cm, which does not meet the requirements of the code for the minimum net protective layer thickness. The combined bridge deck formed in this way has poor integrity, low bearing capacity, and insufficient durability. After the upper part is loaded, it is prone to cracking, which will affect the safety of the bridge structure.

Based on the above situation, there is an urgent need for a bridge deck structure to solve the problems of insufficient bearing capacity and easy cracking of traditional combined bridge decks.

Utility model content

The purpose of this utility model is to provide a bridge deck structure to solve the problems of insufficient bearing capacity and easy cracking of traditional combined bridge decks.

In order to achieve the purpose, the utility model provides a bridge deck structure, including:

The upper layer and the lower layer, the upper layer is a cast-in-place concrete slab, and the lower layer includes several prefabricated slabs, the prefabricated slabs are plain concrete slabs, the thickness of the prefabricated slabs is 2-4 cm, and the prefabricated slabs are at least along the two sides of the transverse bridge. Edge-wrapping steel is provided on each edge of the plate, and the edge-wrapping steel is arranged along the entire length of the corresponding edge of the plate. The edge-wrapping steel includes a lower flange and a web, and the bottom surface of the lower flange and the prefabricated plate The bottom surface is flush, the height of the web is greater than or equal to the thickness of the prefabricated slab, and the prefabricated slab is a concrete member with a compressive strength greater than or equal to 150MPa and a bending and tensile strength greater than or equal to 20MPa.

The bridge deck structure includes an upper floor and a lower floor, the upper floor is a cast-in-place concrete slab, and the lower floor consists of several prefabricated slabs. The prefabricated slab is prefabricated, and the structure itself is installed on the construction site without installing or dismantling additional formwork or tying steel bars, which simplifies the construction steps and shortens the construction period; the standardized production of the prefabricated slab is conducive to the quality control of the prefabricated slab; the prefabricated slab is plain concrete The slab does not have steel bars inside, so that the thickness of the prefabricated slab can be reduced to 2-4 cm, and it is poured with concrete with a compressive strength greater than or equal to 150MPa and a bending and tensile strength greater than or equal to 20MPa, so that the thickness can be reduced to When it is 2-4 cm, it can still maintain sufficient strength and rigidity. In order to make up for the insufficient tensile strength caused by the inability to install steel bars on the prefabricated slab, edge-wrapped steel is provided on the edge of the prefabricated slab, and the edge-wrapped steel is used to cover the prefabricated For all the edges of the slab or the slab edges along the transverse direction of the bridge, the two ends of the edge-wrapped steel are coincident with the two ends of the covered slab. The edge-wrapped steel includes: the lower flange and the web, the bottom surface of the lower flange and the prefabricated The bottom surface of the slab is on the same plane, and the height of the web is greater than or equal to the thickness of the prefabricated slab. The edge-wrapped steel itself has high strength and rigidity, and is combined with the prefabricated slab. To strengthen the bending and tensile strength and stiffness of the prefabricated slab, improve the bending deformation resistance and damage resistance of the prefabricated slab under load, and ensure the structural safety.

By reducing the thickness of the prefabricated slab, the thickness of the upper cast-in-place concrete slab is increased, that is, the cross-section height of the cast-in-place concrete slab is increased, thereby improving the bearing capacity of the cast-in-place concrete slab, and further improving the stiffness and stiffness of the combined bridge deck. Strength, so that the overall bearing capacity is improved, the bridge deck is prevented from cracking, and the safety of the bridge is ensured.

Preferably, the edge-wrapping steel is only arranged on two plate edges along the transverse bridge direction.

The prefabricated slab is erected on the main girder, and the edge-wrapped steel is only arranged on two slab edges along the transverse bridge direction. According to the support relationship between the prefabricated slab and the main beam, the transverse direction of the bridge is the main force direction of the prefabricated slab, and the edge-wrapped steel is arranged on The edge of the prefabricated slab in the main stress direction is combined with the high-strength and high-toughness prefabricated slab. Its construction technology can ensure the joint stress of steel and concrete, which plays a role in strengthening the bending and tensile strength and rigidity of the prefabricated slab, and improves the prefabricated slab. The ability to resist bending deformation and damage under load ensures the safety of the structure.

Preferably, two prefabricated panels adjacent to each other in the longitudinal direction of the bridge are connected by hemming steel.

Two prefabricated panels longitudinally adjacent to each other along the bridge direction are connected together by edge-wrapping steel, and then several prefabricated panels are connected to form the bottom plate of the entire bridge deck. The installation process is fast and efficient, and the construction period is shortened.

Preferably, the hemming section steels on two adjacent prefabricated panels are connected by welding or bolts.

The edge-wrapped steel on two adjacent prefabricated slabs is connected by welding or bolts, which can realize the rapid splicing of multiple prefabricated slabs, improve the construction efficiency, shorten the construction period, and the welded connection is firm and reliable, which provides a guarantee for the quality of the bridge deck. Guarantee; and the outer edge of the edge-wrapped steel is neat, and the welding connection is tight without grout leakage, which ensures the quality of the pouring and molding of the cast-in-place concrete slab.

Preferably, several holes are arranged longitudinally at intervals on the edge-wrapping steel.

When channel steel is used for the edge-wrapped steel, the upper and lower flanges and webs of the edge-wrapped steel are provided with a number of holes along the longitudinal interval of the edge-wrapped steel; A plurality of holes are arranged at longitudinal intervals along the edge-wrapped section steel. During the pouring and forming process of the prefabricated slab, the concrete enters the hole to form a concrete shear tenon, which enhances the connection performance of the prefabricated slab and the edge-wrapped steel, so that the edge-wrapped steel and the prefabricated slab can better jointly bear the force and further improve The flexural and tensile load-bearing capacity of prefabricated panels.

Preferably, the hole diameter is 5-10 mm.

The hole diameter is 5-10 mm, so that the prefabricated slab can form a shear tenon with sufficient strength when pouring concrete, thereby ensuring the reliable connection between the prefabricated slab and the edge-wrapped steel.

Preferably, the center-to-center distance between two adjacent holes along the longitudinal direction of the wrapping steel is 3-6 cm.

The distance between the centers of two adjacent holes along the longitudinal direction of the edge-wrapped steel is 3-6 cm, so that the shear tenon on the prefabricated panel has sufficient distribution density, thereby ensuring the reliable connection between the prefabricated panel and the edge-wrapped steel.

Preferably, the web height of the hemming section steel is the same as the thickness of the prefabricated panel.

The web height of the edge-wrapped steel is the same as the thickness of the prefabricated slab. When the prefabricated slab is prefabricated, the edge-wrapped steel is used as the side form for pouring concrete on the prefabricated slab. The thickness of the edge-wrapped steel is the thickness of the prefabricated slab, which is convenient. The production process, and the thickness of the prefabricated slab is controlled by the fixed-thickness hemming steel, which ensures the consistency of the shape of the prefabricated concrete slab.

Preferably, the edge-wrapping section steel is channel steel, and the top surface of the upper flange of the channel steel is flush with the top surface of the prefabricated panel.

The edge-wrapping section steel is made of channel steel, the web of the channel steel is close to the edge of the prefabricated slab, the top surface of the upper flange of the channel steel is flush with the top surface of the prefabricated slab, and the bottom surface of the lower flange is flush with the bottom surface of the prefabricated slab. The channel steel is completely attached to the prefabricated slab, and it can work better with the prefabricated slab. The channel steel can improve the bending and tensile strength of the bottom of the prefabricated slab.

Preferably, the upper surface of the prefabricated panel is in the shape of nap.

After the concrete is poured, the upper surface of the prefabricated slab is roughened, so that the upper surface of the precast slab is rough and can be better combined with the cast-in-place concrete slab to improve the durability of the bridge.

The utility model at least includes the following beneficial effects:

The bridge deck structure of the utility model realizes reducing the thickness of the prefabricated concrete slab by using high-strength and high-toughness concrete with a compressive strength greater than or equal to 150MPa and a bending and tensile strength greater than or equal to 20MPa, canceling the steel bars in the prefabricated slab, and setting the edge-wrapped steel. Reduced to 2-4 cm. First of all, the prefabricated slab meets the requirements of load-bearing capacity and structural rigidity. Secondly, the thickness of the prefabricated slab is reduced, which reduces the self-weight, facilitates installation, and reduces the difficulty of construction and labor intensity of workers. Finally, the one-time overall cast-in-situ cast-in-place The thickness of the poured concrete slab increases the section height of the cast-in-place concrete slab, and its integrity is improved, thereby improving the structural rigidity and structural strength of the combined bridge deck composed of the prefabricated slab and the cast-in-place concrete slab. The strong combined bridge deck can strengthen the connection between the single main girders, so that the discrete main girders form an overall structure, and the torsional, bending and overall stability of the bridge are greatly improved. The edge-wrapped steel not only improves the bearing capacity of the prefabricated slab, but also plays the role of connecting the prefabricated slab, and the connection is tight without grout leakage, which ensures the molding quality of the cast-in-place concrete slab; The force falcon occlusal, better common force, the upper surface of the precast slab is roughened, which makes the combination of the precast slab and the cast-in-place concrete slab more tightly, and improves the durability of the bridge.

Description of drawings

Fig. 1 is a structural schematic diagram of the bridge deck structure of the present invention.

Fig. 2 is a schematic diagram of the prefabricated panel of the present invention.

FIG. 3 is a partially enlarged view of FIG. 2 .

Fig. 4 is a data diagram of the bending and pulling bearing capacity test of the prefabricated panel of the present invention.

Reference signs: 1-prefabricated slab, 2-wrapping section steel, 3-hole, 4-cast-in-place concrete slab.

detailed description

Below in conjunction with accompanying drawing and embodiment the technical content of the present utility model is further described:

Embodiment one

As shown in Figures 1, 2, and 3, the bridge deck structure includes an upper layer and a lower layer. The upper layer is a cast-in-place concrete slab 4, and the lower layer includes several prefabricated slabs 1. The width of the prefabricated panels can be spliced into multiple columns horizontally to form the lower layer of the bridge deck structure, and the joints of the prefabricated panels 1 horizontally spliced are located on the top surface of the main girder. The prefabricated slab 1 adopts concrete with a compressive strength greater than or equal to 150MPa and a bending and tensile strength greater than or equal to 20MPa according to the stress of the bridge. The concrete compressive strength greater than or equal to 60MPa is high-strength concrete. The prefabricated slab 1 has the characteristics of high strength and high toughness , and set the edge-wrapped steel 2 only on the edge of the transverse bridge, the edge-wrapped steel 2 is channel steel, the top surface of the upper flange of the channel steel is in the same plane as the top surface of the prefabricated slab 1, and the lower flange of the channel steel The bottom surface is on the same plane as the bottom surface of the prefabricated slab 1, the web of the channel steel is close to the side of the slab edge of the prefabricated slab 1, the lower flange enhances the tensile strength of the bottom of the prefabricated slab 1, and the web improves the vertical direction of the prefabricated slab 1. Rigidity, the upper flange enhances the compressive strength of the top of the prefabricated slab 1, and the edge-wrapped steel 2 is combined with the prefabricated slab 1. Its construction technology can ensure the joint force of steel and concrete, and strengthen the bending and tensile strength of the prefabricated slab 1. The role of stiffness improves the bending deformation resistance and damage resistance of the prefabricated slab 1 under load, thereby reducing the thickness of the prefabricated slab 1 from the traditional 5-10 cm to 2 cm. By reducing the thickness of the prefabricated slab 1, the The thickness of the cast-in-place concrete slab 4 on the upper layer increases the cross-section height of the cast-in-place concrete slab 4, thereby improving the bearing capacity of the cast-in-place concrete slab 4, thereby increasing the stiffness and strength of the combined bridge deck, so that the overall load-carrying The force is lifted, the bridge deck is prevented from cracking, and the safety of the bridge is ensured.

The specifications of the edge-wrapped steel 2 are: the web is 2 cm high, the width of the upper and lower flanges is 2 cm, and the thickness is 2 mm. The web and the upper and lower flanges of the edge-wrapped steel 2 are all provided with some holes 3, and the aperture of the holes 3 is 5- 10 millimeters, preferably 7 millimeters in this scheme, the center-to-center spacing of adjacent holes 3 is 3-6 centimeters, preferably 4 centimeters in this scheme, in the prefabricated process of prefabricated slab 1, hemming steel 2 can be used as prefabricated slab 1 The concrete of the prefabricated slab 1 flows into the hole 3 to form a shear tenon, so that the edge-wrapped steel 2 and the prefabricated slab 1 are closely occluded and work together better; the shape of the prefabricated slab 1 is rectangular, and the rectangular assembly is simple. The vertical and horizontal directions must be placed correctly, and there is no need to assemble according to other specific rules, which greatly improves the installation efficiency and shortens the construction period. The production cost is reduced; the edge-wrapped steel 2 is arranged on the edge of the prefabricated slab 1 along the transverse direction of the bridge deck, that is, the slab edge of the main stress direction of the prefabricated slab 1, which improves the bearing capacity of the prefabricated slab 1 when it is assumed to be on the main girder. After the prefabricated slab 1 and the cast-in-place concrete slab 4 are bonded together, the prefabricated slab 1 can become a part of the bridge deck to bear the load of the bridge deck; the adjacent prefabricated slabs 1 are connected by welding with the edge-wrapped steel 2, namely The reliability of the connection of the prefabricated slab 1 is guaranteed, and the sealing of the connection of the prefabricated slab 1 can also be kept. During the pouring process of the cast-in-place concrete slab 4, there will be no grout leakage, which ensures the molding quality of the cast-in-place concrete slab 4; During the slab 1 process, the upper surface of the precast slab 1 is roughened to increase the roughness of the upper surface of the precast slab 1, so that the cast-in-place concrete slab 4 and the precast slab 1 are bonded more firmly, and the durability of the bridge deck structure is improved.

The edge-wrapped steel 2 can also be selected as angle steel, the bottom of the lower flange of the angle steel is on the same plane as the bottom of the prefabricated panel 1, the web of the angle steel is close to the side of the edge of the prefabricated panel 1, and the lower flange strengthens the tensile strength of the bottom of the prefabricated panel 1. Intensity, the web enhances the vertical stiffness of the prefabricated slab 1, and the angle steel is also provided with holes 3, which are used to form a shear tenon on the prefabricated slab 1 and strengthen the connection between the prefabricated slab 1 and the angle steel.

Adjacent prefabricated panels 1 along the longitudinal direction of the bridge are connected by hemming steel 2, and the hemming steel 2 is connected by bolts, and the hemming steel 2 is provided with connecting ears, and the bolts pass through the connecting ears to connect adjacent hemming steels 2 , special type of work that does not involve welding, the construction difficulty is reduced, the connection speed is fast, the construction period is shortened, and the bolt connection is strong, stable and reliable, and the project quality is improved.

The holes 3 can also be arranged only at intervals on the web of the hemming steel 2 along the longitudinal direction of the hemming steel 2 . During the pouring process of the prefabricated slab 1, its concrete enters the hole 3 to form a concrete shear tenon, which enhances the connection performance between the prefabricated slab 1 and the edge-wrapped steel 2, so that the edge-wrapped steel 2 and the prefabricated slab 1 can be better Joint stress improves the durability of the prefabricated concrete slab.

The holes 3 can also be arranged only at intervals along the longitudinal direction of the hemming shaped steel 2 on the flange of the hemming shaped steel 2 . During the pouring process of the prefabricated slab 1, its concrete enters the hole 3 to form a concrete shear tenon, which enhances the connection performance between the prefabricated slab 1 and the edge-wrapped steel 2, so that the edge-wrapped steel 2 and the prefabricated slab 1 can be better Joint stress improves the durability of the prefabricated concrete slab.

The edge-wrapped steel 2 can also be arranged on the four sides of the prefabricated slab 1, which greatly increases the strength and rigidity of the prefabricated slab 1 and further increases the strength and rigidity of the bridge deck.

The edge-wrapping steel 2 can also be arranged on two plate edges along the transverse bridge and one plate edge along the longitudinal bridge direction of the prefabricated slab 1, which greatly increases the strength and rigidity of the prefabricated slab 1 and further increases the strength and rigidity of the bridge deck .

The test data of the bending and tensile bearing capacity of the prefabricated slab is shown in Figure 4: the experimental object of this experiment is: a prefabricated slab 1 with a specification of 100 cm * 50 cm * 2 cm, and the purpose of the test is: the prefabricated slab 1 is installed in a package The comparison of the bending and tensile bearing capacity of the edge-shaped steel 2 and that without the edge-wrapped steel 2, (the specifications of the edge-wrapped steel 2 are: the web height is 2 cm, the width of the upper and lower flanges is 2 cm, and the thickness is 2 mm, and the edge-wrapped steel 2 The web and the upper and lower flanges of the web are all provided with holes 3, and the aperture of the holes 3 is 7 millimeters, and the center-to-center spacing of two adjacent holes 3 along the longitudinal direction of the edge-wrapping steel 2 is 4 centimeters. The setting mode of the edge-wrapping steel 2 is as follows Figure 2). The test results are: the bending and tensile ultimate load-bearing capacity of the prefabricated panel 1 with edge-wrapped steel 2 is 8.3kN, and the bending-tensile ultimate load-bearing capacity of the prefabricated panel 1 without edge-wrapped steel 2 is 3.5kN, the former is 2.4 times of the latter , which is enough to prove that the edge-wrapped steel 2 greatly improves the bending and tensile bearing capacity of the prefabricated panel 1 .

It should be understood that the utility model is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various forms of deformation and modification within the scope of the claims, which do not affect the essence of the utility model.

Claims (10)

1. A deck slab structure comprising: upper strata and lower floor, its characterized in that: the prefabricated slab structure is characterized in that the upper layer is a cast-in-place concrete slab (4), the lower layer comprises a plurality of prefabricated slabs (1), the prefabricated slabs (1) are plain concrete slabs, the thickness of the prefabricated slabs (1) is 2-4 cm, at least two slab edges of the prefabricated slabs (1) in the transverse bridge direction are provided with edge-wrapped section steel (2), the edge-wrapped section steel (2) is arranged along the length corresponding to the slab edges, the edge-wrapped section steel (2) comprises a lower flange and a web plate, the bottom surface of the lower flange is flush with the bottom surface of the prefabricated slabs, the height of the web plate is larger than or equal to the thickness of the prefabricated slabs (1), and the prefabricated slabs (1) are concrete members with the compressive strength larger than or equal to 150MPa and the bending tensile strength larger than or equal to 20 MPa.

2. Bridge deck structure according to claim 1, characterized in that said profiled edge cladding bars (2) are arranged only at two plate edges in the transverse direction.

3. Bridge deck structure according to claim 2, characterized in that two of said precast slabs (1) adjacent in the longitudinal direction of the bridge are connected by a profiled bar (2) with a border.

4. Bridge deck structure according to claim 3, characterized in that said profiled edge sections (2) of two adjacent precast slabs (1) are welded or bolted.

5. Bridge deck structure according to claim 1, characterized in that a number of holes (3) are provided in the profiled edge section (2) at longitudinal intervals.

6. Bridge deck structure according to claim 5, characterized in that said holes (3) have a diameter of 5-10 mm.

7. Bridge deck structure according to claim 6, characterized in that the centre-to-centre spacing of two said holes (3) adjacent in the longitudinal direction of said profiled section (2) is 3-6 cm.

8. Bridge deck structure according to claim 1, characterized in that the web height of said profiled edge sections (2) is the same as the thickness of said precast slabs (1).

9. The deck panel structure according to claim 8, characterised in that the channel section steel (2) is a channel steel, and the top surface of the upper flange of the channel steel is flush with the top surface of the precast slab (1).

10. Bridge deck structure according to any of claims 1-9, characterized in that the upper surface of said precast slab (1) is of napped form.

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