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Parallel chord timber truss and method of making the same

The technology of chord wood and truss is applied in the field of parallel chord truss and its production, which can solve the problems of poor floor vibration comfort, and achieve the effects of improving the utilization rate of wood, improving the flexural bearing capacity and stiffness, and improving the utilization rate of wood.

Active Publication Date: 2022-05-06
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the deficiencies in the prior art, one of the purposes of this application is to provide a parallel-chord wooden truss and its manufacturing method, which can meet the rigidity requirements and ensure that the deflection and vibration frequency of the floor with the parallel-chord wooden truss are in the vibration-insensitive area , to solve the problem of poor floor vibration comfort

Method used

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  • Parallel chord timber truss and method of making the same
  • Parallel chord timber truss and method of making the same
  • Parallel chord timber truss and method of making the same

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Example 1: The upper chord 1, the lower chord 2, the straight web 3 and the oblique web 4 are manufactured using LVL with a strength grade of 12E-38f. The thickness t of the LVL is 30 mm, and the width w is 60mm. The fabricated parallel-chord wooden truss has a height of 300mm, a width of 60mm and a length of 6 meters. When a uniformly distributed load of 1.9kPa is used, the mid-span deformation of the parallel-chord wooden truss is measured to be 2.7711mm. The ultimate load of this parallel-chord wooden truss is 6.97kN. The mid-span deformation refers to the deformation in the middle of the length direction of the parallel string wooden truss.

[0072] As a comparison, the tooth plate in the prior art is used to connect the wooden truss, and the sawn timber made of the wooden truss has a thickness of 38mm and a width of 60mm. The sawn timber can use SPF (Spruce-Pine-Fir, spruce-pine-fir) boards. The height, width and length of the finished wooden trusses are consis...

Embodiment 2

[0073]Example 2: The upper chord 1, the lower chord 2, the straight web 3 and the oblique web 4 are manufactured using LVL with a strength grade of 14E-42f. The thickness t of the LVL is 40 mm, and the width w is 80mm. The fabricated parallel-chord wooden truss has a height of 400mm, a width of 80mm, and a length of 8 meters. When a uniformly distributed load of 1.9kPa is used, the mid-span deformation of the parallel-chord wooden truss is measured to be 3.4321mm. The ultimate load of this parallel-chord wooden truss is 14.2kN.

[0074] As a comparison, the tooth plate in the prior art is used to connect the wooden truss, and the sawn timber made of the wooden truss has a thickness of 38mm and a width of 80mm. The height, width and length of the finished wooden trusses are consistent with the above-mentioned parallel-chord wooden trusses. When a uniformly distributed load of 1.9kPa is used, the mid-span deformation of the wooden truss is measured to be 5.8212mm. The ultima...

Embodiment 3

[0075] Example 3: The upper chord 1, the lower chord 2, the straight web 3 and the oblique web 4 are made by using LVL with a strength grade of 15E-45f. The thickness t of the LVL is 45 mm, and the width w is 90mm. The fabricated parallel-chord wooden truss has a height of 450mm, a width of 90mm and a length of 8 meters. When a uniformly distributed load of 1.9kPa is used, the mid-span deformation of the parallel-chord wooden truss is measured to be 2.6987mm. The ultimate load of this parallel-chord wooden truss is 21.84kN.

[0076] As a comparison, the tooth plate in the prior art is used to connect the wooden truss, and the sawn timber made of the wooden truss has a thickness of 38 mm and a width of 90 mm. The height, width and length of the finished wooden trusses are consistent with the above-mentioned parallel-chord wooden trusses. When a uniformly distributed load of 1.9kPa is used, the mid-span deformation of the wooden truss is measured to be 5.1932mm. The ultimate...

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Abstract

The present application discloses a parallel-chord wooden truss and a manufacturing method thereof. The parallel-chord wooden truss includes: an upper chord, the upper chord includes a piece of laminated veneer lumber, and the width of the laminated veneer lumber is 2 times its thickness times, the thickness direction of the LVL is parallel to the height direction of the upper chord; the lower chord is parallel to the upper chord, the lower chord includes two pieces of the LVL, and the two pieces The thickness direction of the laminated veneer lumber is perpendicular to the height direction of the upper chord; the straight web is perpendicular to the upper chord, and the two ends of the straight web are respectively connected to the upper chord and the lower chord; A diagonal-web rod having a predetermined angle with the straight-web rod, and two ends of the diagonal-web rod are respectively connected with the upper chord and the lower chord. The parallel-chord wooden truss provided by this application can meet the rigidity requirements, ensure that the deflection and vibration frequency of the floor with the parallel-chord wooden truss are in the vibration insensitive area, and solve the problem of poor floor vibration comfort.

Description

technical field [0001] The present application relates to the technical field of wooden structures, in particular to a parallel-chord wooden truss and a manufacturing method thereof. Background technique [0002] The descriptions in this section merely provide background information related to the disclosure in this application and may not constitute prior art. [0003] In timber construction, the vast majority of floor slabs are constructed with joist beams. The optional materials for the joists mainly include solid wood sawn timber, I-beams, glulam or parallel string wood trusses, etc. Solid wood sawn timber joists are used less and less due to their span. When I-beam joists and glulam joists are used in the construction of floor pipelines, holes need to be opened in the belly of the joists. The number and position of the holes significantly affect the load-bearing capacity of the joists. The parallel chord wooden truss joists are more popular in recent years because th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E04C3/16
CPCE04C3/16
Inventor 周海宾邓侃邓昊王双永
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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