CN109972510B - Assembled type combined bridge deck system with adjustable rod distance and U-shaped bolt connecting piece - Google Patents

Abstract

The invention relates to an assembled type combined bridge deck system of U-shaped bolt connectors with adjustable rod distances, which comprises U-shaped bolt shear connectors and I-shaped steel beams, wherein the U-shaped bolt shear connectors are arranged on upper flange plates of the I-shaped steel beams at intervals along the length direction of the I-shaped steel beams, concrete is poured on the upper flange plates of the I-shaped steel beams to form a concrete bridge deck, and the concrete bridge deck is hung on a capping beam above a pier to form the steel-concrete assembled type combined bridge deck system. The structure system can realize the effects of reducing the installation error, improving the initial rigidity of the connecting piece and the like, so that the bearing performance in the assembled combined bridge deck system is optimized, and the assembled combined bridge deck system can be directly assembled in a prefabricated manner, is convenient and quick, and has a quick construction progress.

Description

A prefabricated composite bridge deck system with adjustable pole distance and U-shaped bolt connectors

Technical field

The invention relates to the technical field of bridge engineering, and in particular to an assembled composite bridge deck system with adjustable pole spacing of U-shaped bolt connectors.

Background technique

In the field of civil engineering, shear connectors are key parts of steel-concrete composite structures, especially for steel-concrete composite bridge decks. Specifically, shear connectors can resist longitudinal shear forces on the stacked surfaces of concrete slabs and steel beams so that they cannot slip. At the same time, shear connectors can resist the "lifting force" that tends to separate the concrete slab and steel beam. Therefore, the type of shear connectors adopted and arranged has become the key to the overall performance of the composite structure.

At present, there are many forms of shear connectors, which are divided into rigid connectors and flexible connectors. Traditional shear connectors mainly include channel steel shear connectors, bent bar shear connectors and stud shear connectors. Among them, curved bar connectors are the earliest to be used, and their production and construction are relatively simple. However, because only the tensile strength of the curved bars is used to resist shear force, the direction of the shear force is used in a single direction, and the effect is poor. Channel steel shear connectors have better shear resistance, but the engineering volume is relatively large. Bolt shear connectors are the most widely used. Bolts are suitable for factory production. On-site installation and welding requires a lot of work, the process is complex, the efficiency is low, and the construction quality is difficult to guarantee.

The steel-concrete composite bridge deck is a new type of bridge deck with good mechanical performance and economy, and has broad development prospects. The steel-concrete composite bridge deck can give full play to the respective advantages of the constituent materials, increase the span of the bridge deck, reduce the weight, greatly improve the construction progress, and improve the safety of the construction. The steel-concrete composite bridge deck has low maintenance costs, easy replacement, short construction period, and good economics.

Based on a large amount of research, this invention uses threaded sleeves to connect a pair of inverted L-shaped short limbs to a U-bolt shear connector, and passes the threaded section at the end of the short limb of the U-shaped piece through the upper flange of the I-beam. The upper inverted tapered screw holes are reserved and connected with bolts, and this new U-shaped shear connector is used in the steel-concrete assembled composite bridge deck system to meet the requirements of strength design and convenient bridge construction on site.

Contents of the invention

The purpose of the present invention is to overcome the problems existing in the prior art and provide an assembled composite bridge deck system with adjustable pole distance and U-shaped bolt connectors.

In order to achieve the above technical objectives and achieve the above technical effects, the present invention is implemented through the following technical solutions:

An assembled composite bridge deck system with adjustable pole spacing U-shaped bolt connectors, including U-shaped bolt shear connectors and I-shaped steel beams, on which there are at certain distances along the length direction of the I-shaped steel beams A U-shaped bolt shear connector is provided on the flange plate, concrete is poured on the upper flange plate of the I-shaped steel beam to form a concrete bridge deck, and the concrete bridge deck is hoisted on the cover beam above the bridge pier to form a steel-concrete assembly. Bridge deck system.

Further, the U-shaped bolt shear connector is composed of a pair of inverted L-shaped bolts connected to each other through threaded sleeves. The heads of the short limb sections and the long limb sections of the inverted L-shaped bolts are respectively provided with corresponding threads. The short limb of the inverted L-shaped bolt is connected to the threaded sleeve through threads, and the long limb of the inverted L-shaped bolt is connected to the upper flange plate of the I-shaped steel beam through threads. There is a gap between the short limbs of the two inverted L-shaped bolts. There is a certain gap in the screwed threaded sleeve, and the spacing of the U-shaped opening formed by the two inverted L-shaped bolts is adjusted by rotating the threaded sleeve or the short limb section.

Further, the inverted L-shaped bolt includes a short-limb threaded section of the inverted L-shaped bolt, a tapered end section of the long-limbed inverted L-shaped bolt, a threaded section at the end of the long-limbed inverted L-shaped bolt, and an inverted L-shaped bolt screw. The front end of the threaded section of the short leg of the inverted L-shaped bolt is connected to the threaded casing. The rear end of the threaded section of the short leg of the inverted L-shaped bolt is vertically connected to one end of the screw rod of the inverted L-shaped bolt, and an inverted L-shaped bolt bending section is formed at the vertical connection. , the other end of the screw rod of the inverted L-shaped bolt is connected in sequence to the rolling cone section at the end of the long limb of the inverted L-shaped bolt and the threaded section at the end of the long limb of the inverted L-shaped bolt.

Furthermore, the upper flange plate of the I-shaped steel beam is provided with an inverted tapered reserved hole, and the inverted tapered reserved hole is matched with the tapered section at the end of the long limb of the inverted L-shaped bolt to improve the resistance. Shear stiffness, the threaded section at the end of the long limb of the inverted L-shaped bolt passes through the inverted tapered reserved hole and extends below the upper flange plate of the I-beam, and the threaded section at the end of the long limb of the inverted L-shaped bolt passes through the nut Fixed to the upper flange plate of the I-beam.

Further, the threaded section of the short limb of the inverted L-shaped bolt, the tapered section at the end of the long limb of the inverted L-shaped bolt, the threaded section at the end of the long limb of the inverted L-shaped bolt and the screw rod of the inverted L-shaped bolt are made of ordinary steel bars or steel rods. It has an inverted L-shaped integrated structure.

Furthermore, the height of the tapered section at the end of the long limb of the inverted L-shaped bolt should not be less than the thickness of the upper flange plate of the I-shaped steel beam.

Furthermore, a number of transverse stiffening ribs are provided on the side of the main beam of the I-shaped steel beam.

Further, the overlap between the lower flange plate of the I-shaped steel beam and the cover beam is connected and fixed through a support.

The beneficial effects of the present invention are:

1. The short limbs of a pair of inverted L-shaped bolts that are connected to each other can be connected through threaded sleeves to adjust the screw spacing between the inverted L-shaped bolts, eliminating the problem of the inverted tapered reserved hole spacing on the flange plate of the I-beam. Manufacturing and installation errors.

2. The upper flange plate of the I-shaped steel beam is provided with an inverted tapered reserved hole, and the lower end of the inverted L-shaped bolt is provided with a corresponding tapered section at the end of the long limb of the inverted L-shaped bolt, which avoids the gap between the traditional screw rod and the reserved screw hole. Problems with low initial stiffness of shear connectors caused by installation tolerances.

3. Two inverted L-shaped bolts are connected through threaded sleeves to form a U-shaped bolt shear connector, which can coordinate forces to exert shear resistance and pull-out resistance in the composite beam, optimizing the overall stress performance.

4. Each component of the U-bolt shear connector can be prefabricated in the factory and assembled directly, which is convenient and fast, increasing the speed of manufacturing the composite bridge deck and thereby improving the construction progress.

Description of drawings

Figure 1 is a schematic structural diagram of the inverted L-shaped bolt of the present invention;

Figure 2 is a schematic structural diagram of a U-shaped bolt formed by connecting two inverted L-shaped bolts with sleeve nuts according to the present invention;

Figure 3 is a schematic cross-sectional view of the U-bolt shear connector of the present invention connected to the I-beam;

Figure 4 is a schematic structural view of U-shaped bolt shear connectors arranged on the upper flange of an I-shaped steel beam according to the present invention;

Figure 5 is a schematic structural diagram of a single combined bridge deck of the present invention;

Figure 6 is a structural cross-sectional view of a single composite bridge deck of the present invention;

Figure 7 is a schematic structural diagram of the arrangement of bridge piers, cap beams and supports of the present invention;

Figure 8 is a schematic structural diagram of a single composite bridge deck of the present invention hoisted on a cover beam;

Figure 9 is a schematic structural diagram of the hoisted assembled composite bridge deck system of the present invention.

Explanation of the numbers in the figure: 1. The thread section of the short limb of the inverted L-shaped bolt, 2. The cone section at the end of the long limb of the inverted L-shaped bolt, 3. The thread section at the end of the long limb of the inverted L-shaped bolt, 4. The screw rod of the inverted L-shaped bolt, 5 , Inverted L-shaped bolt bending section, 6. Inverted tapered reserved hole, 7. I-shaped steel beam, 8. Threaded sleeve, 9 nut, 10. Washer, 11. Transverse stiffener, 12. Concrete bridge deck, 13. Bridge pier, 14. Cap beam, 15. Support, 16. Edge engaging part of concrete bridge deck.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figure 9, an assembled composite bridge deck system with adjustable pole spacing U-bolt connectors includes U-bolt shear connectors and I-shaped steel beams 7. Along the length of the I-shaped steel beam 7 Direction, U-shaped bolt shear connectors are provided on the upper flange plate at certain distances, and concrete is poured on the upper flange plate of the I-beam 7 to form a concrete bridge deck 12. In this embodiment, on the concrete A concrete bridge deck edge engaging portion 16 is provided on one side of the bridge deck 12, which can be used to connect other parts of the concrete bridge deck 12. The concrete bridge deck 12 is hoisted on the cover beam 14 above the bridge pier 13 to form a steel-concrete assembly. Combined bridge deck system.

The U-bolt shear connector is composed of a pair of inverted L-shaped bolts connected to each other through threaded sleeves 8. The heads of the short limb sections and the long limb sections of the inverted L-shaped bolts are respectively provided with corresponding threads. The short leg section of the inverted L-shaped bolt is connected to the threaded sleeve 8 through threads, and the long leg section of the inverted L-shaped bolt is connected to the upper flange plate of the I-shaped steel beam 7 through threads. There is a gap between the short legs of the two inverted L-shaped bolts. There is a certain gap in the screwed threaded sleeve 8, and the spacing of the U-shaped opening formed by the two inverted L-shaped bolts is adjusted by rotating the threaded sleeve 8 or the short limb section.

The inverted L-shaped bolt includes a short-limb threaded section 1 of the inverted L-shaped bolt, a tapered end section 2 of the long-limbed inverted L-shaped bolt, a threaded section 3 at the end of the long-limbed inverted L-shaped bolt, and a screw rod 4 of the inverted L-shaped bolt. The front end of the threaded section 1 of the short leg of the L-shaped bolt is screwed to the threaded sleeve 8, and the rear end of the threaded section 1 of the short leg of the inverted L-shaped bolt is vertically connected to one end of the screw rod 4 of the inverted L-shaped bolt, and an inverted L is formed at the vertical connection. The other end of the inverted L-shaped bolt screw rod 4 is connected in sequence to the rolling cone section 2 at the end of the long limb of the inverted L-shaped bolt and the threaded section 3 at the end of the long limb of the inverted L-shaped bolt.

The upper flange plate of the I-shaped steel beam 7 is provided with an inverted tapered reserved hole 6. The inverted tapered reserved hole 6 matches the tapered section 2 at the end of the long limb of the inverted L-shaped bolt. During installation, It is advisable to ensure that the two can fit closely to improve the shear stiffness. The tapered section 2 at the end of the long limb of the inverted L-shaped bolt reduces the cross-section of the screw 4 of the inverted L-shaped bolt. During processing, excessive cross-section reduction should be avoided. Large, thereby reducing the shear stiffness of the connection, the threaded section 3 at the end of the long limb of the inverted L-shaped bolt passes through the inverted tapered reserved hole 6 and extends below the upper flange plate of the I-beam 7, under the The threaded section 3 at the end of the long limb of the inverted L-shaped bolt is fixed to the upper flange plate of the I-beam 7 through the nut 9. During installation, the end of the long limb of the inverted L-shaped bolt extends through the inverted tapered reserved hole 6. The length of the threaded section 3 shall not be less than the height of the nut 9. In this embodiment, a washer 10 is provided on the threaded section 3 at the end of the long limb of the inverted L-shaped bolt for cooperating with the nut 9.

The short-limb threaded section 1 of the inverted L-shaped bolt, the tapered end section 2 of the long-limbed inverted L-shaped bolt, the threaded section 3 at the end of the long-limbed inverted L-shaped bolt and the screw rod 4 of the inverted L-shaped bolt are made of ordinary steel bars or steel rods bent Processed into an inverted L-shaped integrated structure.

The height of the tapered section 2 at the end of the long limb of the inverted L-shaped bolt should not be less than the thickness of the upper flange plate of the I-beam 7.

A number of transverse stiffening ribs 11 are provided on the side of the main beam of the I-shaped steel beam 7 .

The overlap between the lower flange plate of the I-shaped steel beam 7 and the cover beam 14 is connected and fixed by a support 15 .

The implementation steps of the present invention during specific installation and use will be described in detail below in conjunction with the above technical solutions and the accompanying drawings:

The first step, as shown in Figure 1, is to use ordinary steel bars or steel rods and process them into an inverted L shape. The long and short limbs of the inverted L-shaped steel rod are perpendicular to each other. An inverted L is processed at the end of the short limb of the inverted L-shaped steel rod. The threaded section 1 of the short limb of the bolt is processed in sequence on the long leg section to process the screw rod 4 of the inverted L-shaped bolt, the tapered section 2 at the end of the long limb of the inverted L-shaped bolt, and the threaded section 3 at the end of the long limb of the inverted L-shaped bolt;

In the second step, as shown in Figure 2, take two inverted L-shaped bolts and butt them at the threaded section 1 of the short limb of the inverted L-shaped bolt, and connect them with threaded sleeves 8 to form a U-shaped bolt shear connector. The threaded sleeves 8 are Internally threaded casing;

The third step, as shown in Figure 3, is to drill an inverted tapered reserved hole 6 on the upper flange plate of the I-beam 7 according to the designed screw hole spacing, and connect the long limb of the U-shaped bolt shear connector The segment is inserted into the inverted tapered reserved hole 6, and the end of the long limb of the inverted L-shaped bolt has a tapered section 2 that matches the inverted tapered reserved hole 6, and the threaded end of the long limb of the inverted L-shaped bolt extends out of the inverted tapered reserved hole 6. Section 3 is connected tightly with bolts 9;

The fourth step, as shown in Figure 4, is to arrange a certain number of required U-bolt shear connectors on the I-beam 7. The spacing between the U-bolt shear connectors refers to the relevant conventional specifications in this field;

In the fifth step, as shown in Figures 5 and 6, concrete is poured above the upper flange plate of the I-shaped steel beam 7 to form a concrete bridge deck, and then a combination of U-shaped bolt shear connectors with adjustable pole distance is formed. bridge deck;

The sixth step, as shown in Figure 7, is to arrange the designed bridge piers 13. Above the bridge piers 13 is the cover beam 14, and a number of supports 15 with certain spacing are arranged on the cover beam 14;

In the seventh step, as shown in Figure 8, the above-mentioned combined bridge deck with adjustable U-shaped bolt shear connectors is hoisted on the support 15 on the cover beam 14.

The eighth step, as shown in Figure 9, is to arrange the above-mentioned combined bridge deck with adjustable U-bolt shear connectors between the cover beams 14. The corresponding bridge spans can be increased according to the design requirements to form a bridge deck. An assembled composite bridge deck system based on a U-shaped bolt shear connector with adjustable pole distance.

Principle of the invention

In the present invention, ordinary steel bars or steel bars are processed into an inverted L-shaped integrated structure, and the short limbs of the inverted L-shaped steel bars or steel rods are processed into the inverted L-shaped bolt short limb threaded sections 1, and the long limbs are sequentially Process the inverted L-shaped bolt screw 4, the inverted L-shaped bolt long limb end rolling cone section 2 and the inverted L-shaped bolt long limb end threaded section 3; space the upper flange plate of the I-shaped steel beam 7 according to the designed screw hole spacing. Exit the inverted tapered reserved hole 6;

The short limb threaded sections 1 of the inverted L-shaped bolts of the two inverted L-shaped bolts are connected with a threaded sleeve 8, which eliminates the manufacturing and installation of the aperture spacing of the inverted tapered reserved holes 6 in the upper flange plate of the I-shaped steel beam 7. Error, insert the long limb of the inverted L-shaped bolt into the inverted tapered reserved hole 6, so that the end of the long limb of the inverted L-shaped bolt, the tapered section 2, fits the inverted tapered reserved hole 6, and the end of the long limb of the inverted L-shaped bolt The threaded section 3 protrudes from the inverted tapered reserved hole 6 and is tightly connected with a nut 9, which avoids the problem of low initial stiffness caused by installation errors in the establishment of traditional connectors.

Arrange U-shaped connectors with specified spacing on the upper flange plate of the I-beam 7, pour concrete on the I-beam 7 to form a concrete bridge deck 12, and then hoist the completed steel-concrete composite bridge deck as a whole. On the cover beam 14 of the bridge pier 13 paved with the support 15, the spacing of the U-shaped opening formed by the two inverted L-shaped bolts is adjusted by rotating the threaded sleeve 8 or the short limb section, thereby forming an adjustable rod distance. Prefabricated composite bridge deck system with U-shaped bolt connectors.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (6)

1. The assembled type combined bridge deck system of the U-shaped bolt connecting pieces with adjustable rod distances is characterized by comprising U-shaped bolt shear connecting pieces and I-shaped steel beams (7), wherein the U-shaped bolt shear connecting pieces are arranged on upper flange plates of the I-shaped steel beams (7) at intervals along the length direction of the I-shaped steel beams (7), concrete is poured on the upper flange plates of the I-shaped steel beams (7) to form a concrete bridge deck (12), and the concrete bridge deck (12) is hoisted on a capping beam (14) above a pier (13) to form a steel-concrete assembled type combined bridge deck system;

the U-shaped bolt shear connector is formed by connecting a pair of inverted L-shaped bolts with each other through threaded sleeves (8), the heads of the short limb sections and the long limb sections of the inverted L-shaped bolts are respectively provided with corresponding threads, the short limb sections of the inverted L-shaped bolts are screwed with the threaded sleeves (8) through threads, the long limb sections of the inverted L-shaped bolts are connected with an upper flange plate of an I-shaped steel beam (7) through threads, a certain gap is reserved between the short limbs of the two inverted L-shaped bolts in the screwed threaded sleeves (8), and the distance between U-shaped openings formed by the two inverted L-shaped bolts is adjusted through screwing the threaded sleeves (8) or the short limb sections;

and a plurality of transverse stiffening ribs (11) are arranged on the side face of the girder of the I-shaped steel girder (7).

2. The assembled type combined bridge deck system of the U-shaped bolt connecting piece with adjustable rod distance according to claim 1, wherein the inverted-L-shaped bolt comprises an inverted-L-shaped bolt short limb threaded section (1), an inverted-L-shaped bolt long limb tail end rolling cone section (2), an inverted-L-shaped bolt long limb tail end threaded section (3) and an inverted-L-shaped bolt screw rod (4), the front end of the inverted-L-shaped bolt short limb threaded section (1) is screwed with a threaded sleeve (8), the rear end of the inverted-L-shaped bolt short limb threaded section (1) is vertically connected with one end of the inverted-L-shaped bolt screw rod (4), an inverted-L-shaped bolt bending section (5) is formed at the vertical connection, and the other end of the inverted-L-shaped bolt screw rod (4) is sequentially connected with the inverted-L-shaped bolt long limb tail end rolling cone section (2) and the inverted-L-shaped bolt long limb tail end threaded section (3).

3. The assembled type combined bridge deck system of the U-shaped bolt connecting piece with adjustable rod distance according to claim 2, wherein an inverted cone-shaped reserved hole (6) is formed in the upper flange plate of the I-shaped steel beam (7), the inverted cone-shaped reserved hole (6) is matched with the inverted L-shaped bolt long limb tail end rolling cone section (2) for improving shear rigidity, the inverted L-shaped bolt long limb tail end thread section (3) penetrates through the inverted cone-shaped reserved hole (6) and extends out of the lower portion of the upper flange plate of the I-shaped steel beam (7), and the inverted L-shaped bolt long limb tail end thread section (3) is fixedly connected with the upper flange plate of the I-shaped steel beam (7) through a nut (9).

4. A fabricated composite bridge deck system with adjustable rod spacing for U-bolt connectors according to claim 2 or 3, wherein the inverted L bolt short limb thread section (1), the inverted L bolt long limb end rolling cone section (2), the inverted L bolt long limb end thread section (3) and the inverted L bolt screw (4) are of an integral structure which is formed by bending common steel bars or steel bars into an inverted L shape.

5. A modular deck system for a U-bolt joint with adjustable gauge according to claim 3, wherein the height of the inverted L bolt long extremity rolling cone section (2) is not necessarily less than the thickness of the upper flange plate of the i-beam (7).

6. The assembled combined bridge deck system of the U-shaped bolt connection piece with adjustable rod distance according to claim 1, wherein the lap joint between the lower flange plate of the I-shaped steel beam (7) and the cover beam (14) is fixedly connected through a support (15).