CN209941468U

CN209941468U - Wood-concrete combined truss girder

Info

Publication number: CN209941468U
Application number: CN201920272540.3U
Authority: CN
Inventors: 王立彬; 朱文广; 吴尚坤; 徐绍斌
Original assignee: Nanjing Forestry University
Current assignee: Nanjing Forestry University
Priority date: 2019-03-04
Filing date: 2019-03-04
Publication date: 2020-01-14
Anticipated expiration: 2029-03-04

Abstract

The utility model provides a wood-thoughtlessly makes up truss girder, include: the bridge comprises a bridge body, a main truss upper chord, a main truss web member, a concrete bridge deck, a shear connector, a main truss lower chord, an upper flat cross-link, a lower flat cross-link and a middle longitudinal link. The bridge beam body consists of a main truss, a concrete bridge deck, a shear connecting piece, an upper horizontal cross-link, a lower horizontal cross-link and a middle longitudinal-link; the main truss consists of a main truss upper chord, a main truss web member and a main truss lower chord, and the upper flat cross-connection and the lower flat cross-connection connect the main truss upper chord and the main truss lower chord at two sides; the middle longitudinal joint is connected with the upper chord of the main truss through being hinged with the upper horizontal transverse joint; the shear connector connects the upper chord of the main truss with the concrete bridge deck. The utility model discloses in, all the other structures except concrete bridge deck adopt the CLT as the material, and this kind of material matter is light, makes structural durability improve after making up with concrete bridge deck, and anti-seismic performance is superior to ordinary reinforced concrete bridge.

Description

Wood-concrete combined truss girder

Technical Field

The utility model belongs to the technical field of bridge timber structure and specifically relates to a wood-thoughtlessly make up truss girder is related to.

Background

A truss beam is a widely used structure in bridges, consisting of a number of web members. Truss girders have been introduced as large support structures with their excellent bending resistance and strong deformation coordination capability.

The truss girder forms commonly used today are mainly of the steel construction type, the prestressed concrete type and the steel-concrete type. These forms of truss beams are heavy, cumbersome to construct, long-lived, and expensive. Early girder bridges used wood trusses, but were discarded because wood was easily rotten, had low strength, and had little spanning capacity.

The emerging CLT staggered laminated wood has the advantages of light weight, good anti-seismic performance, convenient construction and wide material source. Nowadays bridges of wood construction are widely present in several countries around the world.

The CLT staggered laminated wood connects the main truss and the concrete bridge deck into a whole through the shear connecting piece to carry the load together, the good tensile strength of the wood and the compressive strength of the concrete are fully utilized, the concrete prevents the lower main truss from being corroded by rainwater, the structural durability is improved, the maintenance cost is correspondingly reduced, the wood structures such as the main truss can be prefabricated, the construction period is shortened, and the anti-seismic performance of the wood-concrete composite beam bridge is superior to that of the common reinforced concrete beam bridge.

The wood-concrete combined truss girder has the advantages of low carbon, environmental protection, short construction period, convenient maintenance, good safety and adaptability, low construction cost and the like, and can generate good social, ecological and economic benefits. The development of modern wood structure bridges is an important embodiment for adhering to scientific development and walking a sustainable development way.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved is as follows: the utility model aims at providing a wood-mix combination truss roof beam under the condition that does not reduce bridge bearing capacity and stability for the construction cycle of bridge shortens, cost reduction, the construction process is also cleaner.

The technical scheme is as follows: a wood-concrete composite truss girder comprising: a bridge girder body, a main truss, an upper chord of the main truss, web members of the main truss, a concrete bridge deck, a shear connecting piece, a lower chord of the main truss, an upper flat cross-link and a lower flat cross-link,

the wood-concrete combined truss girder is characterized in that the bridge girder body consists of a main truss, a concrete bridge deck, a shear connector, an upper horizontal cross-link, a lower horizontal cross-link and a middle longitudinal cross-link.

The wood-concrete combined truss girder is characterized in that the main truss consists of a main truss upper chord, a main truss web member and a main truss lower chord, and the upper flat cross-connection and the lower flat cross-connection connect the main truss upper chord and the main truss lower chord on two sides.

The wood-concrete combined truss girder is characterized in that the middle longitudinal joint is connected with the upper chord of the main truss through being hinged with the upper flat transverse joint.

The wood-concrete combined truss girder is characterized in that the shear force connecting piece connects the upper chord of the main truss with the concrete bridge deck.

The wood-concrete combined truss girder is characterized in that a connecting line of a bottom edge point of a concrete bridge deck and a bottom edge point of a lower chord of a main truss with a corresponding cross section forms an angle of 40 degrees with the vertical direction.

The wood-concrete combined truss girder is characterized in that the shear connectors are in the form of trapezoid notches and square head screws.

The wood-concrete combined truss girder is characterized in that the included angle between the middle longitudinal connection and the lower horizontal transverse connection is 45 degrees.

The wood-concrete combined truss girder is characterized in that the structures except the concrete bridge deck slab adopt orthogonal laminated wood as materials.

Has the advantages that: the wood-concrete combined truss girder of the utility model connects the main truss and the concrete bridge deck into a whole through the shear connector, and the main truss and the concrete bridge deck are jointly loaded, thereby fully utilizing the good tensile property of CLT and the compressive property of concrete, and the concrete prevents the lower main truss from being eroded by rainwater, thereby improving the structural durability and correspondingly reducing the maintenance cost; the main truss and other wood structures can be prefabricated, the construction period is saved, and the anti-seismic performance of the wood-concrete composite beam bridge is superior to that of a common reinforced concrete beam bridge.

Drawings

Fig. 1 is a front view of the wood-concrete composite truss girder of the present invention;

fig. 2 is a schematic view of a main truss of the wood-concrete composite truss girder of the present invention;

fig. 3 is a perspective view of the wood-concrete composite truss girder of the present invention;

wherein: 1. bridge girder body, 2 main truss, 3 main truss upper chord, 4 main truss web member, 5 concrete bridge deck, 6 shear connector, 7 main truss lower chord, 8 upper horizontal cross-linking, 9 lower horizontal cross-linking, 10 middle longitudinal cross-linking

Detailed Description

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

Example 1

As shown in fig. 1 to 3, the wood-concrete composite truss girder includes: the bridge comprises a bridge body 1, a main truss 2, a main truss upper chord 3, a main truss web member 4, a concrete bridge deck 5, a shear connector 6, a main truss lower chord 7, an upper horizontal cross-link 8, a lower horizontal cross-link 9 and a middle longitudinal link 10.

The bridge girder body 1 consists of a main truss 2, a concrete bridge deck 5, a shear connector 6, an upper horizontal cross-link 8, a lower horizontal cross-link 9 and a middle longitudinal-link 10; the main truss 2 consists of a main truss upper chord 3, a main truss web member 4 and a main truss lower chord 7, and the main truss upper chord 3 and the main truss lower chord 7 on the two sides are connected by an upper flat cross joint 8 and a lower flat cross joint 9; the middle longitudinal joint 10 is connected with the upper chord 3 of the main truss through being hinged with the upper horizontal cross joint 8; the shear connector 6 connects the main truss upper chord 3 with the concrete bridge deck 5.

Wherein, the connecting line of the bottom edge point of the concrete bridge deck 5 and the bottom edge point of the main truss lower chord 7 on the corresponding cross section forms an angle of 40 degrees with the vertical direction.

The shear connector 6 is in the form of a trapezoidal notch plus a lag screw.

The angle between the middle longitudinal joint 10 and the lower horizontal transverse joint 9 is 45 degrees.

The rest structures except the concrete bridge deck slab (5) adopt orthogonal laminated wood as materials.

Claims

1. The wood-concrete combined truss girder is characterized by being composed of a bridge girder body (1); the bridge body (1) consists of a main truss (2), a concrete bridge deck (5), a shear connector (6), an upper horizontal cross-link (8), a lower horizontal cross-link (9) and a middle longitudinal link (10); the main truss (2) consists of a main truss upper chord (3), a main truss web member (4) and a main truss lower chord (7), and the main truss upper chord (3) and the main truss lower chord (7) at two sides are connected by an upper flat cross joint (8) and a lower flat cross joint (9); the middle longitudinal joint (10) is hinged with the upper horizontal cross joint (8) and connected with the upper chord (3) of the main truss; the shear force connecting piece (6) connects the upper chord (3) of the main truss with the concrete bridge deck (5).

2. A wood-concrete composite truss girder according to claim 1, wherein the line connecting the bottom edge point of the concrete deck slab (5) and the bottom edge point of the main truss lower chord (7) at the corresponding cross section forms an angle of 40 ° with the vertical direction.

3. A wood-concrete composite truss beam as defined in claim 1 wherein the shear connectors (6) are in the form of trapezoidal rebates plus lag screws.

4. A wood-concrete composite truss girder according to claim 1 wherein the angle between the middle stringer (10) and the lower flat stringer (9) is 45 °.

5. A wood-concrete composite truss girder according to claim 1, wherein CLT is used as a material for the remaining structures except the concrete deck slab (5).