Wood beam splicing joint for connecting fastener and steel plate and construction method of wood beam splicing joint

Abstract

The invention relates to the field of buildings, and discloses a wood beam splicing joint with fasteners and steel plates connected and a construction method of the wood beam splicing joint. Two perforated steel plates are arranged on the upper face and the lower face of the joint of two sections of wood beams respectively, and the perforated steel plates are equally divided by the joint; the accessories of the expansion anchor bolt comprise a screw rod, a nut, an expansion sheet and a flat washer, the expansion anchor bolt is used for fixedly connecting the wood beam and the perforated steel plate together, and the expansion anchor bolt is vertically arranged in the perforated steel plate and the wood beam; the self-tapping screws are used for fixedly connecting the wood beam with the perforated steel plate and are obliquely arranged in the perforated steel plate and the wood beam. The expansion bolt and the self-tapping screw are adopted, the problems of structure looseness and insufficient bearing capacity caused by an overlarge bolt hole can be effectively solved by utilizing the expansion characteristic of the expansion bolt and the self-tapping characteristic of the self-tapping screw, and the use of the expansion bolt can provide enough rigidity compared with the use of the self-tapping screw for connection, so that the screw is prevented from being bent and damaged.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to a wood beam splicing node connected with a fastener and a steel plate and a construction method thereof. Background Art

[0002] Modern architecture is developing towards larger spans. Steel and concrete structures can be connected by welding and pouring to achieve larger spans. However, due to the length limitations of wood in wooden structures, there are restrictions on the length of wooden beams in production and transportation. Therefore, splicing is required to meet the needs of large-span wooden structures. Spliced ​​nodes have been widely used in grids and arched large-span wooden structure compression-bending members where the bending bearing capacity requirements of the nodes are not high.

[0003] Connection is the most complex and important part of wooden structure buildings, and it is also the weakest part of the entire structure. Especially in large-span wooden structures, the connection performance of the nodes directly affects the strength and stability of the overall structure. Therefore, the connection method of the splicing nodes is crucial to the stability of the structure. In the common splicing methods of wooden beams, fasteners mainly use bolts, embedded bars and self-tapping screws. Bolts often work together with steel plates to achieve splicing, but the presence of bolt holes is prone to stress concentration and cause node damage. Embedded bars can improve the bending bearing capacity and stiffness of spliced ​​beams, but the grouting effect and quality are difficult to guarantee. The overall mechanical properties of spliced ​​beams have a large coefficient of variation. When only self-tapping screws are used as connectors for lap or mortise and tenon wooden beams, the arrangement area of ​​self-tapping screws is limited, resulting in a limited number of arrangements, and they cannot provide sufficient tension when subjected to bending moments. Summary of the invention

[0004] At present, there is no application of expansion anchors, self-tapping screws and steel plates to splice wooden beams. Based on this, a splicing form is proposed in which steel plates are arranged on the upper and lower surfaces of the wooden beams and connected and reinforced with expansion anchors and oblique screws to improve the problems of insufficient bending bearing capacity and poor bending stiffness of spliced ​​wooden beams, improve the bearing capacity and stiffness of spliced ​​beams, increase the application scope of spliced ​​wooden beams in practice, and provide a reference for the design of large-span wooden structures.

[0005] To achieve the above object, the present invention provides the following technical solution: a wood beam splicing node connected by a fastener and a steel plate, comprising two sections of wood beams and two perforated steel plates, wherein the ends of the two sections of wood beams are connected.

[0006] The two perforated steel plates are respectively placed on the upper and lower sides of the joint of the two sections of wooden beams, and the joint divides the perforated steel plates into equal parts;

[0007] Expansion anchor bolts and their accessories, screw rods, nuts, expansion sheets, flat washers, the expansion anchor bolts are used to fix the wood beam and the perforated steel plate together, and the expansion anchor bolts are vertically placed in the perforated steel plate and the wood beam;

[0008] Self-tapping screws, which are used to fix the wooden beam and the perforated steel plate together, and the self-tapping screws are placed obliquely into the perforated steel plate and the wooden beam;

[0009] The expansion anchor bolt is located between the joint of two sections of wooden beams and the self-tapping screw.

[0010] In a preferred example, the present invention can be further configured as follows: the perforated steel plates, expansion anchors and self-tapping screws on and below the wooden beams are arranged in a mirror image.

[0011] In a preferred example, the present invention can be further configured as follows: each perforated steel plate is provided with at least: two groups of steel plate anchor bolt holes for driving expansion anchor bolts, two groups of steel plate nail cap chamfered holes and steel plate screw holes for driving self-tapping screws;

[0012] The steel plate anchor bolt holes, steel plate nail cap chamfer holes and steel plate screw holes on each of the perforated steel plates are symmetrically distributed with the joint of the two sections of wooden beams as the axis;

[0013] The upper and lower sides of the wooden beams are provided with wooden beam anchor holes and wooden beam screw holes corresponding to the steel plate anchor holes and steel plate screw holes.

[0014] In a preferred example, the present invention can be further configured as follows: four expansion anchors and eight self-tapping screws are provided on the two wooden beams, and are symmetrically distributed around the joint of the two sections of the wooden beams.

[0015] In a preferred example, the present invention can be further configured as follows: grooves for accommodating perforated steel plates are provided on the upper and lower sides of the joints of the two wooden beams, so that the outer wall surface of the perforated steel plate and the outer wall surface of the wooden beam are on the same horizontal line.

[0016] In a preferred example, the present invention can be further configured as follows: the end surface of the perforated steel plate is provided with a chamfered hole for a steel plate nail cap which is in communication with the screw hole of the steel plate.

[0017] By adopting the technical solution, the self-tapping screws can be hidden.

[0018] The margins, spacing and distance from the center of the inclined holes on the steel plate to the joints are 4d, 7d and 10d respectively (d is the diameter of the self-tapping screw, unit: mm); the spacing between the anchor holes ranges from 45mm to 55mm, and the margins and distance from the center of the hole to the joints range from 55mm to 65mm.

[0019] The nominal diameter range of the self-tapping screw is 8mm-10mm, the length range is 140mm-240mm, and the nailing angle is 30° to 60°, which is the angle between the self-tapping screw and the horizontal plane and the plumb plane, thereby enhancing the out-of-plane stability to provide higher anti-slip stiffness.

[0020] The nominal diameter range of the expansion anchor is 6mm-8mm, the length range is 45mm-65mm, and the effective anchoring depth range is 35mm-55mm.

[0021] A construction method for a wood beam splicing node connected by a fastener and a steel plate, comprising the following steps:

[0022] S01, formulate a plan based on the specifications of the fasteners and steel plates required to splice the wood beams, including the types and sizes of wood beams, expansion anchors, self-tapping screws and steel plates;

[0023] S02, CNC-processed holes in the steel plate, the direction of the anchor hole is perpendicular to the length of the steel plate, and the size corresponds to the expansion anchor model; the direction of the screw hole is the same as the direction of the self-tapping screw, which is 30° to 60°. The chamfer is used to gradually reduce the hole diameter, so that the self-tapping screw can pass through and the nail cap can be stuck in the notch;

[0024] S03, respectively make grooves in the two sections of the wooden beams, the shape of the grooves is consistent with the shape of the steel plate, ensure that the grooves are flat, and place the steel plate in the grooves;

[0025] S04, install fasteners. First, pre-drill holes in the wood beams at the anchor holes of the upper steel plate. The pre-drilled holes have the same diameter as the expansion anchors. After drilling, use brushes and air guns to clean the wood chips and debris in the holes. Hammer the expansion anchors into the pre-drilled holes to the depth line, install the flat washers and nuts on the expansion anchors, and apply 50-60N·m of torque to them according to the anchor specifications to improve the bending and shear resistance of the spliced ​​nodes. Then, pre-drill holes in the direction of the screw holes at the screw holes of the upper steel plate. The pre-drilled holes have a diameter of about 70% of the diameter of the self-tapping screws. After drilling, use brushes and air guns to clean the wood chips and debris in the holes. Use an electric drill to nail the self-tapping screws into the wood beams in the direction of the pre-drilled holes, and use the pull-out bearing capacity provided by the self-tapping screws to further improve the bending resistance of the spliced ​​beams.

[0026] S05, flip the wooden beam, and repeat the step of S04 at the lower steel plate to complete the splicing of the wooden beam connected with the fastener and the steel plate.

[0027] In summary, the present invention includes at least one of the following beneficial technical effects:

[0028] The present invention is innovative in terms of node connection form and construction form. Compared with the traditional splicing node connection form, the present invention adopts expansion bolts and self-tapping screws. The expansion characteristics of the expansion bolts and the self-tapping characteristics of the self-tapping screws can be used to effectively avoid the problems of structural looseness and insufficient bearing capacity caused by excessively large bolt holes. Compared with only using self-tapping screws for connection, the use of expansion bolts can also provide sufficient rigidity to avoid bending damage of the screws.

[0029] The perforated steel plate embedded in the wood beam can not only keep the overall appearance, but also effectively avoid the local crushing of the wood beam caused by stress concentration. In addition, chamfering the steel plate when opening the hole can change the force on the nail cap from point to line or surface, preventing shear damage to the nail cap. The pre-opening hole can also provide auxiliary effect for maintaining the angle of screw insertion in subsequent construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the expansion anchor bolt in the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the self-tapping screw in the present invention.

[0035] In the attached figure:

[0036] 1. Wooden beam; 2. Perforated steel plate; 3. Expansion anchor bolt; 4. Self-tapping screw; 5. Expansion anchor bolt rod; 6. Expansion sheet; 7. Flat washer; 8. Nut; 9. Striking head; 10. Self-tapping screw cap; 11. Self-tapping screw thread; 12. Self-tapping screw rod; 21. Steel plate anchor bolt hole; 22. Chamfered hole of steel plate nail cap; 23. Steel plate screw hole; 31. Wooden beam anchor bolt hole; 32. Wooden beam screw hole. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] exist Figure 1-4 In the illustrated embodiment, the present invention provides a technical solution: a wood beam splicing node connected by a fastener and a steel plate, comprising two sections of wood beams 1, two perforated steel plates 2, expansion anchors 3 and self-tapping screws 4, the expansion anchors 3 also comprising an expansion anchor screw 5, an expansion sheet 6, a flat washer 7, a nut 8 and a striking head 9, the self-tapping screw 4 also comprising a nail cap 10, a thread 11 and a screw 12, the expansion anchors 3 and the self-tapping screws 4 are used to connect the two sections of wood beams 1 and the perforated steel plates 2 together.

[0039] The upper and lower sides of the two wooden beams 1 are provided with grooves for accommodating the perforated steel plate 2, so that the outer wall surface of the perforated steel plate 2 and the outer wall surface of the wooden beam 1 are on the same horizontal line.

[0040] Two perforated steel plates 2 are respectively placed on the upper and lower sides of the joint of two sections of wooden beams 1, and the joint divides the perforated steel plates 2 into equal parts; the perforated steel plates 2, expansion anchors 3 and self-tapping screws 4 on the upper and lower sides of the wooden beams 1 are arranged in a mirror image.

[0041] Each perforated steel plate 2 is provided with at least: four steel plate anchor holes 21 for driving the expansion anchors 3 (used for vertically driving the expansion anchors 3), eight steel plate nail cap chamfered holes 22 for driving the self-tapping screws 4 (used for placing the nail caps 10 after the self-tapping screws 4 are driven in), and steel plate screw holes 23 (used for driving the self-tapping screws 4 at an angle); the end face of the perforated steel plate 2 is provided with a steel plate nail cap chamfered hole 22 that is connected to the steel plate screw hole 23.

[0042] The steel plate anchor bolt holes 21, steel plate nail cap chamfer holes 22 and steel plate screw holes 23 on each perforated steel plate 2 are symmetrically distributed with the joint of the two sections of the wooden beam 1 as the axis;

[0043] The upper and lower sides of the wooden beam 1 are provided with wooden beam anchor holes 31 and wooden beam screw holes 32 corresponding to the steel plate anchor holes 21 and steel plate screw holes 23 .

[0044] The expansion anchor bolt 3 is used to fix the wooden beam 1 and the perforated steel plate 2 together, and the expansion anchor bolt 3 is vertically placed in the perforated steel plate 2 and the wooden beam 1;

[0045] The self-tapping screws 4 are used to fix the wooden beam 1 and the perforated steel plate 2 together, and the self-tapping screws 4 are obliquely inserted into the perforated steel plate 2 and the wooden beam 1;

[0046] The expansion anchor bolt 3 is located between the joint of the two sections of wooden beams 1 and the self-tapping screw 4.

[0047] The margin, spacing and distance from the center of the steel plate screw holes 23 on the steel plate 2 to the joint are 4d, 7d and 10d respectively (d is the diameter of the self-tapping screw, unit: mm); the spacing of the wooden beam anchor holes 31 ranges from 45mm to 55mm, and the margin and distance from the center of the hole to the joint ranges from 55mm to 65mm.

[0048] The nominal diameter range of the self-tapping screw 4 is 8mm-10mm, the length range is 140mm-240mm, and the nailing angle is 30° to 60°, which is the angle between the self-tapping screw 4 and the horizontal plane and the plumb plane, thereby enhancing the out-of-plane stability to provide higher anti-slip stiffness.

[0049] The nominal diameter range of expansion anchor 3 is 6mm-8mm, the length range is 45mm-65mm, and the effective anchoring depth range is 35mm-55mm.

[0050] Construction method:

[0051] Step 1: Prepare a complete engineering wood beam 1, open a notch in the middle of the upper and lower surfaces to place the steel plate 2, and then cut it into two parts from the middle of the span, and grind the cut surface to ensure that there are no burrs;

[0052] Step 2: prepare two steel plates 2, arrange anchor holes 21 and screw holes 23 according to the margins and spacings of expansion anchors 3 and self-tapping screws 4, and perform CNC machining. During machining, the end positions of the screw holes 23 are chamfered to form nail cap chamfer holes 22;

[0053] Step 3: Butt the two sections of wooden beams 1 in step 1 together, and make sure that the gap is almost invisible to the naked eye. Then place the two steel plates 2 in the notches. Pre-drill holes at the locations of the anchor holes 21 of the upper perforated steel plate 2. After cleaning the holes, drive in expansion anchors 3 and apply pre-tightening force. Then pre-drill holes at the locations of the screw holes 23. After cleaning the holes, use an electric drill to drive in self-tapping screws 4 to complete the installation of the upper perforated steel plate 2.

[0054] Step 4: Turn over the spliced ​​wooden beams and perform the same operation as step 3 on the lower surface, so that the two sections of wooden beams 1 and the two steel plates 2 are tightly connected through expansion anchors 3 and self-tapping screws 4 to form a whole.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wood beam joint node connected by a fastener and a steel plate, comprising two wood beams (1) and two perforated steel plates (2), wherein the ends of the two wood beams (1) are connected, and characterized in that: The two perforated steel plates (2) are respectively placed on the upper and lower sides of the joints of the two sections of wooden beams (1), and the joints divide the perforated steel plates (2) into equal parts; An expansion anchor (3), the expansion anchor (3) being used to fix the wooden beam (1) and the perforated steel plate (2) together, the expansion anchor (3) being vertically inserted into the perforated steel plate (2) and the wooden beam (1); A self-tapping screw (4), the self-tapping screw (4) being used to fix the wooden beam (1) and the perforated steel plate (2) together, the self-tapping screw (4) being inserted obliquely into the perforated steel plate (2) and the wooden beam (1); The expansion anchor bolt (3) is located between the joint of the two sections of wooden beams (1) and the self-tapping screw (4).

2. A wood beam joint node connected by a fastener and a steel plate according to claim 1, characterized in that: The perforated steel plates (2), expansion anchor bolts (3) and self-tapping screws (4) on the upper and lower sides of the wooden beam (1) are arranged in a mirror-like manner.

3. A wood beam joint node connected by a fastener and a steel plate according to claim 2, characterized in that: Each perforated steel plate (2) is provided with at least: two groups of steel plate anchor bolt holes (21) for driving expansion anchor bolts (3), two groups of steel plate nail cap chamfered holes (22) and steel plate screw holes (23) for driving self-tapping screws (4); The steel plate anchor bolt holes (21), the steel plate nail cap chamfered holes (22) and the steel plate screw holes (23) on each of the perforated steel plates (2) are symmetrically distributed with the joint of the two sections of the wood beams (1) as the axis; The upper and lower sides of the wooden beam (1) are provided with wooden beam anchor holes (31) and wooden beam screw holes (32) corresponding to the steel plate anchor holes (21) and the steel plate screw holes (23).

4. A wood beam joint node connected with a fastener and a steel plate according to claim 3, characterized in that: Four expansion anchor bolts (3) and eight self-tapping screws (4) are arranged on the two wooden beams (1) and are symmetrically distributed with the joint of the two sections of wooden beams (1) as the axis.

5. A wood beam joint node connected by a fastener and a steel plate according to claim 1, characterized in that: Grooves for accommodating the perforated steel plate (2) are provided on the upper and lower sides of the joint of the two wooden beams (1), so that the outer wall surface of the perforated steel plate (2) and the outer wall surface of the wooden beam (1) are on the same horizontal line.

6. A wood beam joint node connected by a fastener and a steel plate according to claim 1, characterized in that: The end surface of the perforated steel plate (2) is provided with a steel plate nail cap chamfered hole (22) which communicates with the steel plate screw hole (23).

7. A construction method for a wood beam joint connecting a fastener and a steel plate according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: prepare a complete wooden beam (1) and open a groove in the middle of the upper and lower surfaces to accommodate the perforated steel plate (2), then cut it into two parts from the center of the groove, and grind the cut surface to ensure that there are no burrs; Step 2: prepare two perforated steel plates (2), arrange the steel plate anchor holes (21) and the steel plate screw holes (23) according to the margins and spacings of the expansion anchors (3) and the self-tapping screws (4), and perform CNC machining, during which the end positions of the steel plate screw holes (23) are chamfered to form steel plate nail cap chamfer holes (22); Step 3: butt the two sections of wooden beams (1) in step 1 together without any gap, then place the two perforated steel plates (2) in the groove, first pre-drill holes at the locations of the steel plate anchor bolt holes (21) of the upper perforated steel plate (2), clean the holes, hammer in expansion anchor bolts (3) and apply pre-tightening force, then pre-drill holes at the locations of the steel plate screw holes (23), clean the holes, and use an electric drill to drive in self-tapping screws (4) to complete the installation of the upper surface perforated steel plate (2); Step 4: Turn over the spliced ​​wooden beams and perform the same operation as step 3 on the lower surface, so that the two sections of wooden beams (1) and the two perforated steel plates (2) are fixedly connected by expansion anchor bolts (3) and self-tapping screws (4) to form a whole.

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