CN109914219B - Orthogonal laminated wood assembled wood arch structure - Google Patents
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- CN109914219B CN109914219B CN201910220487.7A CN201910220487A CN109914219B CN 109914219 B CN109914219 B CN 109914219B CN 201910220487 A CN201910220487 A CN 201910220487A CN 109914219 B CN109914219 B CN 109914219B
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Abstract
The invention discloses an orthogonal laminated wood assembled wood arch structure, which comprises 1 or more wood arch bodies distributed along the width direction of a wood arch, wherein each wood arch body is formed by sequentially splicing a plurality of orthogonal laminated wood along the length direction of the wood arch, two adjacent orthogonal laminated wood are fixed by a side edge connecting metal piece, and one or more layers of composite fastening tensioning layers are fixed on the upper surface of the wood arch body; the cross section of each orthogonal laminated wood is in an isosceles trapezoid shape, and the length of the upper surface of each orthogonal laminated wood is greater than that of the lower surface of each orthogonal laminated wood; the composite fastening tension layer is a carbon fiber layer, a glass fiber layer or a steel belt. The wood arch body and the composite fastening tensioning layer on the wood arch body are in an arch state after being installed in place, and are in a flat plate state during transportation, stacking and storage. The invention adopts the modes of factory prefabrication and field local assembly, is convenient to transport, is simple and quick to assemble, shortens the field construction time, effectively utilizes the dimensional stability of the orthogonal laminated wood, and greatly improves the compressive strength utilization rate of the orthogonal laminated wood.
Description
Technical Field
The invention provides an orthogonal laminated wood assembled wood arch structure, and belongs to the technical field of assembled wood structure buildings.
Background
The fabricated wood structure building is produced by producing some or all wood components in a professional factory in advance and transporting the wood components to a construction site for assembly. The assembly type structure is a fundamental innovation of a traditional construction mode, and compared with a traditional construction method, the assembly type structure adopts a factory assembly line production and field quick hoisting mode, so that the construction speed can be improved, the field construction amount can be reduced, and meanwhile, the assembly type structure has remarkable effects in the aspects of energy conservation, material saving, noise reduction and the like.
Cross-linked plywood (CLT) is a new type of engineered wood product, which is formed by at least three layers of solid wood sawn timber or composite structural boards, which are vertically and alternately arranged and assembled and glued by structural adhesives. As a novel engineering wood product, compared with materials such as steel, glass, concrete and the like, the composite material has the advantages of light dead weight, high heat insulation performance, environmental protection, cycle regeneration and the like. Compared with the common laminated wood, the laminated wood has the advantages of good dimensional stability, large breadth, high transverse strength and the like. Meanwhile, as a novel engineering wood product, the CLT product has controllable performance, high manufacturing precision and easy processing and production, is convenient for prefabrication and assembly, can greatly improve the installation precision and the installation speed, is rapidly developed in areas such as Europe, North America and the like, and is widely used for building assembled and multi-high-rise wood structure buildings.
Due to the limitation of processing technology, the CLT is mostly manufactured by adopting a flat plate cold pressing mode, is mainly used for processing components such as wall plates, floor plates, roof plates and the like, and is rarely used for large spans, spaces and bridge structures. The bending failure mode of the CLT floor and the roof is mostly the rolling shear failure of middle transverse layer wood or the tensile failure of bottom tension layer wood, and the compression failure of the wood is seldom generated. And the designed value of the compressive strength of the wood along the grain is about 1.3-1.6 times of the designed value of the tensile strength of the along the grain, so that the compressive strength of the wood cannot be fully utilized, and the CLT span is also limited.
At present, common wood arch structures are mainly 'wood-woven arch bridges', 'through-wood arch bridges', 'glued wood arch structures' and the like, load-bearing arch ribs are mostly made of logs or glued wood, then wood plates are laid on the arch ribs, and the common wood arch structures are complex in component processing and low in assembly degree, so that the construction period is long. The CLT is still in the research and exploration stage when used for manufacturing the wooden arch, the CLT is not popularized and applied, the CLT is also mostly used for plate type components in a wooden structure, and the research on bending the special-shaped CLT is also few. The vacuum pressurization method for preparing the bent special-shaped CLT plate has complex process and higher cost, and is not applied on a large scale. The method searches for patents and related documents published in China, and finds no research or patent on how to process the prefabricated wood arch structure in a factory by using the CLT plane plate, and can meet the requirements of convenient transportation, quick assembly and the like.
The features and advantages of the present invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Disclosure of Invention
In order to solve some of the above technical problems, the present invention provides an orthogonal laminated wood prefabricated assembly type wood arch structure and a manufacturing method thereof, wherein a CLT board with a small breadth is processed into a standardized module in a factory, is prefabricated into a CLT wood arch structure unit with a large span, and is hoisted and reinforced on site to form the wood arch structure. The invention can improve the span of the CLT board without increasing the CLT thickness, improve the speed and the precision of field installation, save wood, and also has the advantages of stable product quality, controllable strength, good size stability, convenient transportation and the like, thereby better meeting the requirements of wood structure buildings.
In order to solve the technical problems, the invention adopts the technical scheme that:
the invention provides an orthogonal laminated wood assembled wood arch structure which is characterized by comprising 1 or more wood arch bodies distributed along the width direction of a wood arch, wherein the wood arch bodies have the same structure and are respectively formed by sequentially splicing a plurality of orthogonal laminated wood along the length direction of the wood arch, two adjacent orthogonal laminated wood are fixed by a side edge connecting metal piece, and one or more layers of composite fastening tensioning layers are fixed on the upper surface of the wood arch body;
the cross section of the orthogonal laminated wood is in an isosceles trapezoid shape, and the length of the upper surface of the orthogonal laminated wood is greater than that of the lower surface of the orthogonal laminated wood; each orthogonal laminated wood comprises 3-9 wood layers, wood grains on the upper surface layer and the lower surface layer are parallel to each other and are parallel to the length direction of the arch body, and wood grains of adjacent laminated plates are vertical to each other; the wood layer of the orthogonal laminated wood is one or a combination of a plurality of solid wood sawn timber, a laminated veneer lumber and an oriented strand board;
the composite fastening tensioning layer is a carbon fiber layer, a glass fiber layer or a steel belt, the length of the composite fastening tensioning layer is not less than that of the upper surface of the wood arch body, and the strength of the composite fastening tensioning layer can bear the self weight of the composite fastening tensioning layer and the self weight of the wood arch body.
Furthermore, a pair of hinged supports are arranged at two ends of the wood arch body and used for being hinged with the foundation of the orthogonal laminated wood assembly type wood arch structure. Or the orthogonal laminated wood at the two ends of the wood arch body is terminated by a metal piece and is used for forming rigid connection with the foundation of the orthogonal laminated wood assembly type wood arch structure.
Further, the wood arch body and the composite fastening tensioning layer on the wood arch body are in an arch state after being installed in place, and are in a flat plate state during transportation, stacking and storage.
The invention has the characteristics and beneficial effects that:
compared with the existing wood arch processing and mounting technology, the orthogonal laminated wood assembled wood arch structure can fully utilize the pressure resistance of the orthogonal laminated wood board along the grain and improve the span of the orthogonal laminated wood board; meanwhile, the method has the advantages of large width, good dimensional stability, convenience for factory prefabrication and field assembly and the like of the orthogonal laminated wood board. The wood arch structure is in a flat plate shape after being prefabricated in a factory, so that the wood arch structure is convenient to transport and store, the upper surfaces of the CLT plates are connected through the composite fastening layer, the CLT plates are convenient to hoist, an arch is automatically formed by means of self weight, the rapid installation is realized, the transportation cost is reduced, the speed and the precision of field installation are improved, and the construction period is shortened. In addition, the adopted base material is standardized orthogonal laminated wood, the shape and the size of the base material are consistent, the batch processing is convenient, and the required orthogonal laminated wood is small in size and convenient to produce and transport.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic view of an orthogonal laminated wood assembled wood arch construction according to one embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the wood arch structure of FIG. 1 after deployment;
FIG. 3 is a schematic structural view of the side connecting metal part in FIG. 1;
FIG. 4 is a schematic structural view of the pivoting support and self-tapping screw of FIG. 1;
fig. 5 is a schematic diagram of an example surface steel bar reinforcement before hoisting.
Wherein, the correspondence between the reference numbers and the part names in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5 is:
1 orthogonal laminated wood (11, 12 and 13 layers), 2 a composite fastening tension layer (21 is a steel belt, 22 is a self-tapping screw), 3 a side edge connecting metal piece, 4 self-tapping wood screws or pins, 5 an articulated support (51 is channel-shaped steel, 52 is a rib plate, and 53 is a self-tapping screw).
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Specific embodiments of the present invention are further described with reference to the accompanying drawings in which:
the assembled wood arch structure of the orthogonal laminated wood comprises 1 or more wood arch bodies distributed along the width direction of a wood arch, the wood arch bodies are the same in structure and are respectively formed by sequentially splicing a plurality of orthogonal laminated wood 1 along the length direction of the wood arch, two adjacent orthogonal laminated wood are fixed by a side edge connecting metal piece 3, one or more layers of composite fastening tensioning layers 2 are fixed on the upper surface of the wood arch body, and the upper surfaces of the adjacent wood arch bodies are fixedly connected by one or more layers of composite fastening tensioning layers 2; the cross section of each orthogonal laminated wood 1 is in an isosceles trapezoid shape, the length of the upper surface of each orthogonal laminated wood 1 is larger than that of the lower surface of each orthogonal laminated wood, each orthogonal laminated wood 1 comprises 3-9 wood layers, wood grains (straight grains) of the upper surface layer and the lower surface layer are parallel to each other and are parallel to the length direction of the arch body, and the wood grains of the adjacent wood layers are perpendicular to each other; the composite fastening tensioning layer 2 is a carbon fiber layer, a glass fiber layer or a steel belt, the length of the composite fastening tensioning layer 2 is not less than that of the upper surface of the wood arch body, and the strength of the composite fastening tensioning layer 2 can bear the dead weight of the composite fastening tensioning layer and the wood arch body.
The specific implementation and functions of each component in the embodiment of the invention are described as follows:
each orthogonal laminated wood 1 in the wood arch body comprises 3-9 wood layers, and the wood layers of the orthogonal laminated wood are one or a combination of more of solid wood sawn timber, laminated veneer lumber and oriented strand board. As shown in fig. 2, in the present embodiment, 3 wood layers 11, 12, and 13 are adopted, wherein the wood grains of the wood layers 11 and 13 are parallel to the length direction of the wood arch, the wood grains of the wood layer 12 are perpendicular to the length direction of the wood arch, and the composite fastening layer 2 is fixed to the upper surface of the orthogonal laminated wood by using an adhesive or a metal member, so that the orthogonal laminated wood can be bent into an arch shape. The two adjacent orthogonal laminated wood 1 are fixedly connected through a connecting metal piece 3 and a plurality of self-tapping wood screws or pins 4 which are positioned on the side edges of the orthogonal combined wood, the side edge connecting metal piece 3 is installed and fixed after the wood arch body is hoisted, the cross section shape of the side edge connecting metal piece 3 is shown in figure 3 and is consistent with the cross section formed by the side edges of the two adjacent orthogonal combined wood 1 after the wood arch body is hoisted in place, the side edge connecting metal piece 3 can be a galvanized steel plate, a stainless steel plate or an aluminum plate, and the overall rigidity of the wood arch structure can be improved through the side edge connecting metal piece 3; the diameter of the self-tapping wood screw or pin 4 used for fixing the side connecting metal piece 3 is 5-30mm, the length is more than 3 times of the diameter, generally 15-800mm, the bearing capacity of the side connecting metal piece 3 is ensured through the self-tapping wood screw or pin 4, and meanwhile, wood cracking caused by nails is prevented.
The composite fastening tensioning layer 2 fixed on the upper surface of the wood arch body can adopt a carbon fiber layer, a glass fiber layer or a steel belt 21, can be provided with one or more layers, and is fixed with the wood arch body through self-tapping screws 22. Carbon fiber layer, glass layer and steel band combined use or exclusive use, full bed in wood when adopting carbon fiber layer or glass fiber layer encircle the body upper surface, set up a plurality of steel bands at wood body upper surface interval when adopting the steel band. The composite fastening tensioning layer 2 is arranged to enable the composite tensioning layer 2 to bear the weight of the wooden arch in the transportation and hoisting processes, the composite fastening tensioning layer is a flexible layer and can be bent and deformed, the wooden arch can be stacked and horizontally placed on a truck in the transportation process, the wooden arch is bent and arched under the action of gravity in the hoisting process, the on-site assembly is facilitated, the assembly precision and the assembly speed of the wooden arch can be improved, meanwhile, the use of a scaffold on the site is avoided, and the on-site construction amount is greatly reduced. After the wood arch is installed, the composite fastening layer can provide tensile strength, the integral rigidity of the wood arch is improved, and instability and deformation are prevented. Compared with the existing log arch structure, the wood arch can greatly reduce the transportation cost, improve the installation precision and improve the on-site assembly speed.
The two ends of the wooden arch body can be hinged with the foundation of the orthogonal laminated wood assembled wooden arch structure through a pair of hinged supports 5, the hinged supports 5 of the embodiment are groove-shaped steel 51 made of galvanized steel plates, stainless steel plates or aluminum plates as shown in fig. 4, the cross-sectional dimension of the groove-shaped steel plate 51 is matched with that of the two ends of the orthogonal laminated wood 1, the groove-shaped steel plate 51 is fixed with the orthogonal laminated wood 1 through self-tapping screws 53 (the self-tapping screws can be replaced by bolts), and a plurality of rib plates 52 are arranged at intervals at the back of a web plate of the groove-shaped steel 51 and are used for being hinged with the foundation of the orthogonal laminated wood assembled wooden arch structure. In addition, the connection mode of the orthogonal laminated wood assembled wood arch structure and the foundation can also adopt rigid connection, at the moment, the hinged support 5 is replaced by a metal piece (such as a metal plate) which is sealed at the end parts of the orthogonal laminated wood at the two ends of the wood arch body, and the metal piece is installed in a concrete groove or a steel groove of the foundation through the metal plate to form rigid connection.
The orthogonal laminated wood assembly type wood arch structure is installed in a mode of factory prefabrication processing and field assembly reinforcement. The wood arch shape during factory processing and transportation is a plane state (as shown in fig. 5) after the wood arch is unfolded, and when the wood arch assembly is hoisted on site, an arch is formed under the self-weight action of the composite fastening tensioning layer 2 and the orthogonal laminated wood 1, and the wood arch assembly is fixedly installed through the side edge connecting metal piece 3. The method can prepare the orthogonal laminated wood by using the orthogonal laminated wood plates with medium and small breadth, the orthogonal laminated wood is in a flat plate shape in processing and transportation, the storage, the transportation and the hoisting are convenient, the hoisting and the side edge reinforcement are carried out in field operation, and the installation speed is greatly improved.
The dimension specification of the orthogonal laminated wood arch structure provided by the embodiment of the invention is that the span of the arch is 6000mm, the arch height is 2000mm, the arch width is 1200mm, the width of the orthogonal laminated wood 1 is 1200mm, the upper surface length is 657mm, the lower surface length is 636mm, the thickness is 105mm, the orthogonal laminated wood 1 and each connecting piece are processed in a factory, the upper surface of each orthogonal laminated wood is reinforced through a stainless steel band in the factory (namely, the upper surface of the arch is fixed by the stainless steel band and a self-tapping screw), in a construction site, after the wood arch body is hoisted in place through the stainless steel band, galvanized steel plates and the self-tapping screw are fastened on two sides of the arch, and the bottom of the arch is fixed on a foundation through a hinged support formed by welding the steel plates. The length of the arch after being unfolded is about 8m, the width of the arch is 1.2m, a plurality of wood arch structures can be spliced according to the final width of the arch, and the arch can be placed on a truck for flattening assembly during transportation, so that a plurality of arches can be transported at one time, and the transportation cost is saved.
The specific processing and installation steps of the invention are as follows:
1) cutting the orthogonal laminated wood board with the medium and small breadth into the size required by each orthogonal laminated wood according to the span, arch height and arch width of the wood arch; this example cuts a 105mm thick orthogonal laminated wood panel and saws it into standard unit blocks of 1200mm width and 670mm length.
2) According to the design requirement, the side edges of the orthogonal laminated wood are finished, and the orthogonal laminated wood 1 (shown as 1 in fig. 2) with an isosceles trapezoid cross section is processed, specifically: through computer numerical control lathe (CNC), the isosceles trapezoid shape (as shown in fig. 2) that the required quadrature veneer 1 was processed to carry out sand light processing to surface and terminal surface, orthogonal veneer 1 upper surface length 657mm after the processing, lower surface length 636mm, width 1200mm, thickness 105mm, the length error of quadrature veneer 1 who processes is within 1mm, and the width error is within 3mm, and the thickness error is within 1 mm.
3) The upper surface of each orthogonal laminated wood 1 is processed by adopting a planing or sanding mode, so that the flatness of the upper surface is improved, and the subsequent gluing is facilitated.
4) According to design requirements, a certain number of (12 pieces of orthogonal glued wood in the embodiment) orthogonal glued wood is selected, the orthogonal glued wood is arranged in a straight line in a manner that the upper surfaces are connected, the upper surfaces of the adjacent orthogonal glued wood are aligned in the width direction, the lower surfaces of the adjacent orthogonal glued wood are connected in the length direction, the lower surfaces of the adjacent orthogonal glued wood are not contacted, and a gap in the middle is an isosceles triangle; and coating an adhesive to fix the carbon fiber layer, the glass fiber layer or the steel belt on the upper surface of the orthogonal laminated wood in a gluing mode (after gluing, the steel belt can be fixed by adopting a screw reinforcement mode or only adopting a screw fixation mode) to form the composite fastening tensioning layer 2. In the embodiment, a stainless steel band is adopted for reinforcement, the thickness of the stainless steel band is 3mm, the width of the stainless steel band is 50mm, three stainless steel bands are arranged in total, the stainless steel bands are positioned on quartering points in the width direction of the wood arch body, self-tapping wood screws are adopted for fixing the stainless steel bands on the upper surface of the orthogonal laminated wood, the diameter of each screw is 5mm, and the length of each screw is 80 mm;
5) after the adhesive is cured, the excess adhesive is removed and the top and bottom surfaces and the sides of the orthogonal laminated wood are finished.
6) And (3) mounting the bottom hinged support, and before mounting, selecting a spraying preservative according to the use environment of the wood arch to perform preservative treatment on the hinged part at the bottom of the wood arch. And then, fixing the hinged support on orthogonal laminated wood at two ends by adopting a long self-tapping screw to form a wood arch component. The method specifically comprises the following steps: before installation, the end of the orthogonal laminated wood which is to be contacted with the steel groove of the articulated piece is subjected to antiseptic treatment, so that decay of the end caused by later-stage condensed water is prevented, and the antiseptic is low-toxicity water-soluble ACQ antiseptic; after the end head is dried, a bottom hinged support is installed and is formed by welding Q235 steel plates, and surface spraying is carried out after welding for rust prevention treatment; a10 mm hole is formed in the end part of the orthogonal laminated wood in advance to prevent the hinged support from cracking when a screw is installed, and the hinged support is fixed to the end part of the orthogonal laminated wood by using a wood screw, wherein the diameter of the wood screw is 15mm, the length of the wood screw is 200mm, and the distance between the wood screws is 150 mm.
7) And (3) stacking and flatly placing a plurality of wood arch members prefabricated in a factory on a truck, and transporting to an installation site.
8) And (3) hoisting the horizontally placed wood arch member, forming an arch by orthogonal laminated wood under the limitation of self weight and the upper surface steel belt, then installing the wood arch on a support of the foundation, and additionally installing a steel pin for fixing.
9) The wood arch shape is finely adjusted to reach the designed height, the side connecting metal pieces 3 are fixed on two sides of the wood arch body by self-tapping wood screws or pins, two adjacent orthogonal laminated woods 1 are connected and fixed, and the overall rigidity of the wood arch is improved. The side connection metal piece 3 that this embodiment adopted is galvanized Q235 steel sheet, and thickness is 10mm, and the side is connected the metal piece and is connected fixedly with the tapping screw for the quadrature glued wood, and the diameter of screw is 6mm, length 120mm, and screw interval 35mm, 12 self-tapping screws of installation on every side connection metal piece.
10) Repeating the installation process of the steps 8) and 9), and installing a plurality of wood arch members side by side to reach the design width; when the wood arches are installed side by side, the wood arch components can be placed on the temporary base, and then the wood arch components are installed on the basic base after the side connecting metal parts are fixed, when a plurality of wood arches are installed, the adjacent wood arch components can be connected and fixed by adopting stainless steel bands or galvanized steel bands and self-tapping screws, the steel bands are arranged in parallel to the length direction of the wood arches, the width of each steel band is 100-500mm, and the thickness of each steel band is 2-8 mm.
In the description of the present invention, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The assembled wood arch structure is characterized by comprising 1 or more wood arch bodies arranged along the width direction of a wood arch, wherein the wood arch bodies are the same in structure and respectively formed by sequentially splicing a plurality of pieces of orthogonal laminated wood (1) along the length direction of the wood arch, two adjacent pieces of orthogonal laminated wood are fixed through a side connecting metal piece (3), the side connecting metal piece (3) is fixed on the side surface of each two adjacent pieces of orthogonal laminated wood (1) by adopting self-tapping wood screws or pins, and one or more layers of composite fastening tensioning layers (2) are fixed on the upper surface of each wood arch body;
the cross section of the orthogonal laminated wood (1) is in an isosceles trapezoid shape, and the length of the upper surface of the orthogonal laminated wood is greater than that of the lower surface of the orthogonal laminated wood; each orthogonal laminated wood comprises 3-9 wood layers, wood grains on the upper surface layer and the lower surface layer are parallel to each other and are parallel to the length direction of the arch body, and wood grains of adjacent laminated plates are perpendicular to each other; the wood layer of the orthogonal laminated wood is one or a combination of a plurality of solid wood sawn timber, a laminated veneer lumber and an oriented strand board;
the composite fastening tensioning layer (2) is a carbon fiber layer, a glass fiber layer or a steel belt, the length of the composite fastening tensioning layer (2) is not less than that of the upper surface of the wood arch body, and the strength of the composite fastening tensioning layer (2) can bear the dead weight of the composite fastening tensioning layer and the wood arch body;
the wood arch body and the composite fastening tensioning layer (2) on the wood arch body are in an arch state after being installed in place, and are in a flat plate state during transportation, stacking and storage.
2. The cross-laminated wood fabricated wood arch structure of claim 1, further comprising a pair of hinge brackets (5) mounted at both ends of the wood arch body for forming a hinge with a foundation of the cross-laminated wood fabricated wood arch structure.
3. The fabricated wood arch structure of claim 1, wherein the orthogonal glulams at the two ends of the wood arch body are terminated with metal pieces for forming a rigid joint with the foundation of the fabricated wood arch structure of the orthogonal glulams.
4. The fabricated wood arch structure of any one of claims 1 to 3, wherein the side connecting metal pieces (3) are galvanized steel plates, stainless steel plates or aluminum plates; the diameter of the self-tapping wood screw or pin is 5-30mm, and the length of the self-tapping wood screw or pin is more than 3 times of the diameter.
5. The fabricated wood arch structure of claim 2, wherein the hinged support (5) is made of galvanized steel, stainless steel or aluminum plate and is fixed to the orthogonal glulams at both ends of the wood arch body by self-tapping wood screws or bolts.
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| DE202009009661U1 (en) * | 2009-07-16 | 2010-04-01 | Blasig, Ilka | Sprout bows for the gymnastics of the entire human body, particularly suitable for the dissolution of muscle strains due to stretching and loosening, as well as for spinal extension in case of disc discomfort |
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| DE202009009661U1 (en) * | 2009-07-16 | 2010-04-01 | Blasig, Ilka | Sprout bows for the gymnastics of the entire human body, particularly suitable for the dissolution of muscle strains due to stretching and loosening, as well as for spinal extension in case of disc discomfort |
| CN203514619U (en) * | 2013-10-16 | 2014-04-02 | 南京工业大学 | Unidirectional cross-laminated timber enhanced by longitudinal strip FRP (Fiber Reinforce Plastic) |
| CN205189162U (en) * | 2015-12-09 | 2016-04-27 | 南京工业大学 | Assembled laminwood restricted type is prevented bucking power consumption and is supported |
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