CN106522465A - Multiple light wood truss - Google Patents
Multiple light wood truss Download PDFInfo
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- CN106522465A CN106522465A CN201611251969.1A CN201611251969A CN106522465A CN 106522465 A CN106522465 A CN 106522465A CN 201611251969 A CN201611251969 A CN 201611251969A CN 106522465 A CN106522465 A CN 106522465A
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- 241001330002 Bambuseae Species 0.000 claims description 10
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 10
- 239000011425 bamboo Substances 0.000 claims description 10
- 239000002023 wood Substances 0.000 claims description 6
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- 240000002853 Nelumbo nucifera Species 0.000 description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 2
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- 241000218652 Larix Species 0.000 description 1
- 235000005590 Larix decidua Nutrition 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/16—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with apertured web, e.g. trusses
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/48—Dowels, i.e. members adapted to penetrate the surfaces of two parts and to take the shear stresses
- E04B1/486—Shear dowels for wood
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/17—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with non-parallel upper and lower edges, e.g. roof trusses
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention provides a multiple light wood truss which is high in creep resistance, small in residual deformation, good in elastic recovery capacity, small in deformation between joints of an upper chord and a lower chord, high in bearing capacity, good in stability, good in corrosion and fire resistance, convenient to construct and capable of adapting to complex stress environments. The multiple light wood truss is formed by combining two or more common light wood trusses through pin connecting parts, wherein the common light wood trusses are of the same structure, and the pin connecting parts penetrate through chords of the common light wood trusses; and according to the common light wood trusses, dimension lumber serves as rod pieces of the trusses, and joints are connected through toothed plates.
Description
Technical field
This technology refers to a kind of many Pin Light wood truss structural elements, belongs to timber structure design field.
Background technology
The commercial residential buildings room being built in after the eighties in last century, its roof is mostly using the make on flat roof.Due to
It is of the remote past, the phenomenon such as current generally existing attic " cold in winter and hot in summer ", rain leakage and roofing are dirty and messy.This is not only to resident's
Also the integrated environment in city is have impact on while daily life is made troubles, the construction of ecocity advocated with country not phase
Symbol.And pass through " flat-changed-into-sloping " improvement project can be with this problem of adequate solution.Common light duty timber truss is (by dimension stock as purlin
The rod member of frame, timber truss of the node using truss plate connection) due to its high-strength light, good anti-seismic performance, easy construction, flexible design
The features such as widely used in " flat-changed-into-sloping " improvement project.In addition also mostly in modern wood structure superstructure and roof system is to adopt
Common light duty timber truss structural system.So common light duty timber truss has very wide application front in China's building field
Scape.
With the development of light-duty wooden roof and superstructure, building designers are pursuing roof system with the convenience of superstructure
Also the aesthetic feeling of its spatial impression and profile is increasingly paid close attention to simultaneously.So some large-span structures and cantilevered structure also just arise at the historic moment.
Often there are some special truss in these complicated superstructures with roof system, these truss are except by the uniform lotus in top
The outer load for being also subject to other that truss transmission is overlapped with which is carried, so being difficult to be competent at using conventional Light wood truss.
Traditional solution is that a few Pin common light duties timber truss are combined into many Pin timber truss by the way of nail connection,
So as to obtain bigger bearing capacity.But follow closely usually by iron or steel, though electroplated process, still suffers from anticorrosive energy
Hypodynamic problem.And the nail of the steel characteristic that shown mechanical property declines rapidly under the conditions of fire-resistance is also to building
Safety bring hidden danger.In addition it is complicated by following closely many Pin timber truss constructions of connection, it is unfavorable for the large-scale production of factory.
The content of the invention
Present technology provides a kind of creep resisting ability is strong, remaining deformation is little, elastic recovery capability good, the section of top-bottom chord
Between deform little, high capacity and good stability, with good anti-rotten fire resistance, easy construction, adapt to complicated applied force
Many Pin timber truss of environment.
Many Pin Light wood truss of this technology, pass through pin connection part group by the common light duty timber truss of two Pin or two more than Pin
Conjunction is formed, and each common light duty timber truss structure is identical, chord member of the pin connection part through each common light duty timber truss；Described
Common light duty timber truss refer to by dimension stock as truss rod member, node using truss plate connection timber truss.
Above-mentioned many Pin Light wood truss, the version of many Pin Light wood truss include parallel chord truss, column purlin
All existing Light wood truss versions such as frame, Fink truss and Howe truss.
Above-mentioned many Pin Light wood truss, described pin connection part are by the cylinder circle of timber or bamboo processing
Rod；Its diameter 10-25mm, length are determined according to the Pin numbers of its many Pin timber truss for being connected, according to actual requirement of engineering outside which
Week can it is threaded also can not be threaded.
Above-mentioned many Pin Light wood truss, the position that hammers into of pin connection part is the midpoint between the upper and lower chord joint of each truss structure.
Above-mentioned many Pin Light wood truss, hammer in pin connection part and are drilled at the top-bottom chord of each truss structure in advance, hole
Footpath outline is less than pin connection part external diameter, interference fit between pin connection part and hole.
The combination of each truss structure is put neat before drilling and is fixed temporarily, to institute by above-mentioned many Pin Light wood truss
There is truss while drilling, to ensure machining accuracy.
Above-mentioned many Pin Light wood truss, pin connection part can be adopted and hammer into or screws in etc. mode into the hole on top-bottom chord
It is interior.
The beneficial effect of this technology：Can be according to existing Light wood truss construction skill using many Pin timber truss of this technology
Art carries out in-site installation.Common light duty timber truss is solved, on the basis of key node Lack of support to overcome tradition more
Following several point defects of Pin timber truss：
1st, replace the mode of traditional nail joint by the way of pin connection so that the processing of many Pin timber truss is no longer complicated,
So that many Pin timber truss industrialization large-scale production are possibly realized.
2nd, traditional iron connector is substituted using wooden or bamboo pin connection part, so as to solve traditional many Pin wood purlins
The defects such as the anti-corruption of frame, fire resistance difference.
3rd, the nail for breaching traditionally connects many Pin timber truss Pin timber truss bearing capacities more than wooden or bamboo matter pin connection
The high, viewpoint of good stability, is confirmed by testing, and many Pin timber truss bearing capacities of wooden or bamboo matter pin connection are more far above nail connection
Pin timber truss.
4th, the nail for breaching traditionally connects many Pin timber truss Pin timber truss creep resistants more than wooden or bamboo matter pin connection
The good view of ability, elastic recovery capability, is confirmed by testing, many Pin timber truss creep resisting abilities of wooden or bamboo matter pin connection,
Elastic recovery capability connects many Pin timber truss more preferably than nail, and remaining deformation is also less.
5th, many Pin timber truss of pin connection connect the more excellent lateral stability of many Pin timber truss with than nail, and many Pin are wooden for nail connection
When destruction is closed on, there is significantly steep increasing to truss in displacement, and the change in displacement of many Pin timber truss of pin connection is relatively average,
With more preferable ductility.
Description of the drawings
Fig. 1 is that three common light duty timber truss 1 are connected into three Pin parallel chords Light wood truss, 3 mistake by pin connection part 2
Journey schematic diagram.
Fig. 2 is that three common light duty timber truss 4 are connected into three Pin funk formulas Light wood truss, 5 mistake by pin connection part 2
Journey schematic diagram.
Fig. 3 is common light duty timber truss structural front view.
Fig. 4 is the left view of Fig. 3.
Fig. 5 is nail connecting-piece structure and dimensional drawing.
Fig. 6 is test Protonation constant figure.
Fig. 7 is point layout figure.
Fig. 8 is T1Stage load-displacement figure.
Fig. 9 is T2Stage load-displacement figure.
Figure 10 is many truss structure T of nail connection1Lower edge load-amount of deflection figure.
Figure 11 is many truss structure T of pin connection1Lower edge load-amount of deflection figure.
Figure 12 is many truss structure T of different connected modes1Lower edge load-amount of deflection contrast.
Figure 13 is many truss structure T of nail connection2Lower edge load-amount of deflection figure.
Figure 14 is many truss structure T of pin connection2Lower edge load-amount of deflection figure.
Figure 15 is many truss structure standard load phase residual deformation comparison diagrams of different connected modes.
Figure 16 is many truss structure standard load phase creep compliance comparison diagrams of different connected modes.
Figure 17 is two truss structure loading complete process displacement versus time figures.
Figure 18 is many Pin timber truss bearing capacity contrasts of two classes.
Figure 19 is the load-displacement figure of two truss structure of failure stage.
Specific embodiment
Referring to many Pin Light wood truss shown in Fig. 1-2.Fig. 1 be by the common light duty timber truss 1 of three by wooden or
Bamboo pin connection part 2 is in series in thickness direction the process schematic of three Pin parallel chords Light wood truss 3.Fig. 2 is by three
Individual common light duty timber truss 4 is light-duty in the thickness direction three Pin funk formulas that are in series by wooden or bamboo pin connection part 2
The process schematic of timber truss 5.During processing, first fixed each Pin common light duties timber truss marshalling and temporarily.Exist again
The midpoint drilling 6 of each internode of the top-bottom chord of truss.Aperture regarding composition truss Wood Properties Within depending on, if material is softer, hole
Footpath can be suitably less；If material is harder, open pore size is appropriate larger, but aperture can not be more than 25mm.After perforate using as
The wooden or bamboo cylindrical pole of pin connection part 2 is pressed in opened hole 6.The mode of press-in can adopt and pound into or revolve
Enter.
Principle：1. truss is a kind of component of planar structure, and in truss, the connected mode of each rod member can all be reduced to be hinged.
So the truss of freely-supported is when by upper load, top boom must be stressed, and lower boom must be pulling force, each web member in truss
And with by based on pulling force or pressure.According to axial tension or pressurized (not considering unstable failure) element bearing capacity computing formula it is
F=N/A, wherein f represent the stress produced inside rod member under load action, and N represents the size of load, and A represents the net of component
Area of section.From this formula can be seen that by the net cross-sectional area for increasing component can reduce stress inside rod member so as to
Increase the bearing capacity of whole truss.Many Pin timber truss are exactly, using this principle, by way of many Pin are combined, to increase component
Area of section is so as to improving the bearing capacity of truss.
2. the position of pin connection is selected in the centre of each section of chord member.What this was mainly determined by the loading characteristic of chord member.If
Each section of chord member is considered as into simply supported beam, the moment of flexure of middle is maximum under upper load effect, smallest shearing force.And the meter of shear stress
Calculate formula:τ=Q/A, wherein Q represent the size of shearing, and A represents the shearing net section of member in shear, and the reduction of A means that structure
The increase of the shear stress in part, thus should try one's best component shearing smaller part perforate to prevent the sheared destruction of component.
Connect the excellent of many Pin timber truss to verify the load-carrying properties of many Pin timber truss of pin connection and following closely compared to tradition
Gesture, Pin timber truss many to pin connection and many Pin timber truss of nail connection carry out contrast test.
First, test is introduced
Test carries out test for static load for Pin timber truss more than two.Pin timber truss more than two is all by two list Pin timber truss
Composition, single Pin timber truss size of composition is identical, and concrete size is as illustrated, nail and pin hammer into position such as principle institute
State.
Way in the middle of Practical Project is foundation at present《Light wood truss technical specification》The 6th in (JGJ/T 265-2012)
The requirement that different Pin numbers truss are followed closely done by connected mode is carried out in chapter.But at present for the carrying energy of this many Pin timber truss
Power, non-deformability, failure mechanism and most sorrow connected mode also has numerous doubt.This test is intended to different by two classes
Many Pin timber truss test for static load of connected mode, explore different type connected mode to many Pin timber truss bearing capacitys, resistance to deformation
The impact of ability and failure mechanism.
Two subjects
2.1 base material introductions
Dimension stock used by test is Russian import larch, and strength grade is TC17-B, and dimension stock material property is shown in Table
1, material property comes from《Code for design of timber structures》(GB5005-2003).
1 test specification material strength failure criterion of table and elastic modelling quantity (N/mm2)
The performance of tooth plate used is as shown in table 2：
Tooth plate performance parameter is used in the test of table 2
2.2 test specimen introductions
1 truss form
The selected common light duty timber truss of this test is also referred to as truss plate connection timber truss, is characterized in adopting dimension stock
As chord member material, with being attached by the tooth plate of Zinc-coated steel-plated punch, belong to engineered wood product.Version is the modern times
The parallel chords timber truss being most widely used in wooden floor system, specific constructive form and size are as shown in Figure 3,4.Fig. 3-
In 5, arithemetic unit is mm.
Pin Light wood truss more than 2
Many Pin Light wood truss are formed by connecting by two Pin common light duty timber truss, and the connected mode for being adopted has two kinds, and one
Kind it is the mode of common nail connection in current Practical Project；One kind is connected using dowel.Dowel diameter 20mm, length
80mm；The size of nail connector is as shown in Figure 5：
The position by nail connection and pin connection is determined according to the loading characteristic of achievement in research before and parallel chord truss
It is determined that often across the centre of truss.
2.3 load modes and system
The result of many Pin timber truss static tests is closely bound up with the Protonation constant for being adopted, by obtained by different Protonation constants
To timber truss static test there is very big difference.So being ten from the load mode being reasonably consistent with actual condition
Divide important.This test basis latest edition《Timber structure test method standard》Truss test side in (GB/T 50,329 2012)
Method, and binding isotherm calculating, design Protonation constant figure as shown in Figure 6.
From fig. 6, it can be seen that the static test of timber truss uses the mode of hierarchical loading, three phases are divided into,
It is T respectively1：Preloading phase；T2:Packing stage；T3：Failure stage.Wherein T1Stage plays debugging effect, it is ensured that whole
Loading system energy normal work；T2Stage in order to study timber truss continuing load effect under creep-resistant property；T3Stage can
Seek ultimate bearing capacity, non-deformability and the stability of timber truss.P shown in figurekIt is foundation《Timber structure design rule
Model》(GB5005-2003) and《Built-loading specification》(GB50009-2012) bearing capacity of calculated Light wood truss
Design load, is 2.3KN.The load-carrying properties stronger in order to embody many Pin timber truss, this test adopt 2PkThat is 4KN as plus
Carry radix, every grade of load 0.8KN.
2.4 point layout
This experiment coordinates TDS data collecting instruments by ten displacement transducers, to each truss each stage deformation
Lasting, in situ automatic data collection is carried out, frequency acquisition is that every 10s clocks are gathered once.Displacement transducer position as shown in fig. 7,
Its interior joint C, D, E adopt range for the displacement transducer of 100mm, adopt range for 50mm at node B, F, I, J, K, L, M
Displacement transducer.
Three result of the tests and analysis
3.1 non-deformability
《Light wood truss technical specification》Change in (JGJ/T 265-2012) also to truss under all kinds of working conditions
Shape limit value makes explicit provisions, and this is also the requirement that each quasi-truss must is fulfilled for.Additionally, evaluating the resistance to deformation energy of three truss structures
Power, mainly from three angles considering.First under standard load effect, the deformation of each truss；Secondly in continuing load
Under effect, the creep situation of truss；Finally consider after continuing load unloading, the elastic recovery capability of truss.Below just from
Launch in terms of these, analyze the non-deformability of Pin timber truss more than two kinds.
1 is compared with specification
The 3 specification table of comparisons of table
According to table 3, many Pin timber truss of two classes in the presence of standard load and standard dead load, its deformation values everywhere
All can meet substantially《Light wood truss technical specification》Requirement.The indices of many Pin timber truss of pin connection are intended to connect less than nail
Connect many Pin timber truss.Wherein under standard load effect, the deformation values of the internode up and down of many Pin timber truss of pin connection relatively follow closely connection
Many Pin timber truss reduce 50%, 34% respectively, and this just illustrates that many Pin timber truss of pin connection are relatively followed closely many Pin timber truss of connection and respectively saved
There is more preferable concertedness between point, this is also one of the reason for many Pin timber truss bearing capacities of pin connection is higher.Additionally, in standard lotus
Carry and the lower lower edge maximum defluxion of standard dead load effect reduces 9%, 20% respectively, this just illustrates normally to use in building
Under limiting condition, many Pin timber truss of pin connection possess more preferable non-deformability, also just can be suitably used for bigger span require with
And more complicated working condition.
2 creep resistants and elastic recovery capability
By the agency of mistake above, this experiment uses hierarchical loading system carries out test for static load, draws out respectively
T1、T2The load amount of deflection figure in stage, the meaning at its shape and each flex point substantially is as shown in Figure 8,9.In figure, ω1And
ω2T is represented respectively1、T2The remaining deformation of stage truss；ε1And ε2T is represented respectively1、T2Stage truss is acted in continuing load
The situation of lower creep.
As shown in Figure 10, it is that nail connects many Pin timber truss in T1The load-displacement curve of each node of stage lower edge.We can
To find out that the deflection value of the span centre node D in preloading phase truss lower edge is 15.35mm to the maximum, more than minimum E nodes about
At 60%, D node, creep compliance is also 3.8mm to the maximum, beyond about one times minimum of B node.Shown in Figure 11 is many Pin of pin connection
Timber truss is in T1The load-displacement curve of each node of stage lower edge.Being connected with nail, many Pin timber truss of pin connection are being preloaded
It is 14.13mm that the displacement in stage, creep compliance maximum are also appeared at span centre D nodes, and its value is more than minimum F nodes about
36%, maximum creep compliance is 3.83mm, more than at minimum B node 62%.From data above, many Pin wood purlins of pin connection
Frame is in T1In the stage, between the deflection value and creep compliance between each node, mutual difference is less than many Pin timber truss of nail connection, that is,
The many Pin timber truss of pin connection relatively follow closely many Pin timber truss of connection more preferable concertedness.
Such as Figure 12, compared for the load amount of deflection figure of many Pin timber truss of two classes, the shift value of many Pin timber truss of pin connection with
And creep compliance respectively less than follows closely connection.
Referring to Figure 13,14, by contrast two quasi-truss in T2The load deflection curves in stage, we can equally draw many
Pin timber truss can harvest more preferable creep-resistant property and elastic recovery capability using pin connection part, Figure 15,16 can be more clear
Find out to Chu this characteristic.And as can be seen from Figure 17, many Pin timber truss of pin connection are respectively less than in the deformation values of each stage span centre
The many Pin timber truss of nail connection.
3.2 bearing capacity
Its final failing load is as shown in figure 18：
As can be seen from Figure 18, the bearing capacity of many Pin timber truss of pin connection is 9.8KN, and many Pin timber truss of tradition nail connection
Actual carrying capacity be only 7.1KN.By the innovation of connector so that the bearing power increase of many Pin timber truss 38%.
3.3 damage -form
This test carries out test for static load to two distinct types of many Pin timber truss, and two kinds of truss show different breaking
Bad phenomenon.The many Pin timber truss of tradition nail connection show the phenomenon of apparent unstable failure, and many Pin timber truss of pin connection are then
It is that the overall destruction of truss is caused due to the destruction of rod member.
We can see that the destruction of many Pin timber truss of nail connection shows as overall unstability and topples brokenly from failure test
It is bad, and roll force greatly even results in the destruction of bridle iron.Additionally, many Pin timber truss of pin connection two Pin timber truss in destruction
There is no the mutual changing of the relative positions in the position for still keeping original, destruction does not occur by the pin connection part of beech；And follow closely many Pin of connection
In final destruction, there is the obvious changing of the relative positions in truss to timber truss, and nail bends, and a plastic hinge occurs.This
Illustrate that many Pin timber truss are greatly enhanced by improving many Pin timber truss of the more traditional nail connection of connector, its overall coordination.
And nail connection belongs to fastening type connector, and pin connection belongs to non-fastening connection piece, can pass through rotation of the pin in cotter way
The effect of energy dissipating is played, so that many Pin timber truss obtain more excellent lateral stability and bearing capacity.
From the load-displacement curve of two truss structure failure stages shown in Figure 19, it can be seen that many Pin timber truss of nail connection
When destruction is closed on, there is significantly steep increasing in displacement, and the change in displacement of many Pin timber truss of pin connection is relatively average, and this is just
Illustrate that many Pin timber truss of pin connection are relatively followed closely many Pin timber truss of connection and have more preferable ductility.
Four conclusions
1. nail connection, many Pin timber truss of pin connection can meet《Light wood truss technical specification》Deflection limit value is wanted
Ask, but the deformation of the internode of the upper and lower chord member of many Pin timber truss of pin connection is less, illustrate that many Pin timber truss of pin connection have more
Good concertedness.
2. non-deformability of many Pin timber truss of pin connection in each stage respectively less than follows closely many Pin timber truss of connection.And pin connection
Many Pin timber truss have more preferable creep resisting ability, and remaining deformation is also less than many Pin timber truss of nail connection, many Pin timber truss
With more preferable elastic recovery capability.
3. the bearing capacity of many Pin timber truss of pin connection is also better than the nail many Pin timber truss of connection, and bearing power increase is about
38%.
4. many Pin timber truss of pin connection also have more preferable stability, are also better than many Pin of nail connection wooden on failure mode
Truss.
Claims (7)
1. Pin Light wood truss more than, is characterized in that：Pin connection part group is passed through by the common light duty timber truss of two Pin or two more than Pin
Conjunction is formed, and each common light duty timber truss structure is identical, chord member of the pin connection part through each common light duty timber truss；Described
Common light duty timber truss refer to by dimension stock as truss rod member, node using truss plate connection timber truss.
2. many Pin Light wood truss as claimed in claim 1, is characterized in that：The version of many Pin Light wood truss is comprising flat
Row string truss, column truss, Fink truss and Howe truss.
3. many Pin Light wood truss as claimed in claim 1, is characterized in that：Described pin connection part is added by timber or bamboo wood
The cylindrical pole of work；Its diameter 10-25mm.
4. many Pin Light wood truss as claimed in claim 3, is characterized in that：There is screw thread the periphery of pin connection part.
5. many Pin Light wood truss as claimed in claim 1, is characterized in that：The position that hammers into of pin connection part is each truss structure
Midpoint between upper and lower chord joint.
6. many Pin Light wood truss as claimed in claim 1, is characterized in that：The upper and lower of each truss structure is hammered in pin connection part
Drilled at chord member in advance, aperture outline is less than pin connection part external diameter, interference fit between pin connection part and hole.
7. many Pin Light wood truss as claimed in claim 6, is characterized in that：The combination of each truss structure is put neatly simultaneously before drilling
Fixed temporarily, all truss are drilled simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611251969.1A CN106522465A (en) | 2016-12-30 | 2016-12-30 | Multiple light wood truss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611251969.1A CN106522465A (en) | 2016-12-30 | 2016-12-30 | Multiple light wood truss |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111485672A (en) * | 2020-04-24 | 2020-08-04 | 中国林业科学研究院木材工业研究所 | Parallel chord wood truss and manufacturing method thereof |
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| CN111485672A (en) * | 2020-04-24 | 2020-08-04 | 中国林业科学研究院木材工业研究所 | Parallel chord wood truss and manufacturing method thereof |
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