Method for connecting laminated wood member and steel member

Abstract

The invention discloses a method for connecting a laminated wood component and a steel component. The method comprises the following steps that a steel plate clamping groove and a supporting plate groove forming an inverted T shape with the steel plate clamping groove are formed in the laminated wood component; a connecting steel plate is welded on the steel member, and a supporting plate forming an inverted T-shaped structure with the connecting steel plate is fixed at the bottom of the connecting steel plate; manufacturing a steel liner tube, and fixing an annular plate at one end of the steel liner tube; connecting the laminated wood member and the steel member: firstly brushing an adhesive on the outer surface of the steel liner tube, then inserting a plurality of pairs of steel liner tubes into a plurality of pairs of bolt holes in the laminated wood member, and after the adhesive is solidified, installing the annular plate on two side surfaces of the end part of the laminated wood member through a plurality of tapping screws; the connecting steel plate is inserted into the steel plate clamping groove; connecting bolts penetrate through the connecting holes in the steel lining pipes and the connecting steel plates, and nuts are tightened preliminarily; an adhesive is injected into the steel plate clamping groove; and after the adhesive is solidified, all the nuts are tightened again. The connecting joint of the laminated wood component and the steel component can be effectively prevented from loosening.

Description

Technical Field

[0001] The present invention relates to a connection method between a glued laminated timber member and a steel member. Background Art

[0002] The connection node between a glued laminated timber member and a steel member or other members usually adopts the form of "connection steel plate + bolt" to transfer the axial force and shear force between the members. This node practice meets the relevant requirements of the national standard GB50005 "Design Standard for Wood Structures". The connection steel plate 10 is welded to the steel member 1. A steel plate slot 20 is opened at the end of the glued laminated timber member 2 for inserting the connection steel plate 10. The connection bolt 3 passes through the glued laminated timber member 2 and the connection steel plate 10, and tightening the nut 40 can achieve a reliable connection between the glued laminated timber member 2 and the steel member 1 (see Figure 1a and Figure 1b ).

[0003] In the conventional "connection steel plate + bolt" connection form, after the glued laminated timber member 2 is stressed, the connection bolt 3 is pressed against the surface of the glued laminated timber member 2. Due to the shrinkage characteristics of wood itself and the loose texture of wood, the compressibility is also relatively high. Even for glued laminated timber members that have been mechanically graded, the wood surface will gradually undergo extrusion deformation under local compression.

[0004] The width of the steel plate slot 20 opened at the end of the glued laminated timber member 2 is generally 1 - 2 mm larger than the thickness of the connection steel plate 10 to ensure the feasibility of installation. The gap between the side wall of this steel plate slot 2 and the connection steel plate 10 is generally not further processed. When the connection bolt 3 is tightened, the glued laminated timber member 2 is squeezed, and the gap is locally compacted around the screw hole. In addition, the local surface of the glued laminated timber member 2 under the gasket 41 is under cross-grain compression, and the cross-grain compression strength of wood is relatively low, only about 1 / 4 of the longitudinal compression strength. After the nut 40 is tightened, the surface of the glued laminated timber member 2 under the gasket 41 will also gradually undergo extrusion deformation. Therefore, after the glued laminated timber structure 2 is used for a period of time, when irreversible extrusion deformation occurs on the stressed surface of the wood, the connection will become loose. For timber structures under long-term vibration working conditions, such as timber bridges, etc., the probability of loosening at the node connection is higher, which will affect the safety of the glued laminated timber structure 2. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a connection method between a glued laminated timber member and a steel member, which can effectively prevent the connection node between the glued laminated timber member and the steel member from loosening.

[0006] The purpose of the present invention is achieved as follows: A connection method between a glued laminated timber member and a steel member requires preparing several sets of fasteners. Each set of fasteners includes a connection bolt, two gaskets, and a nut;

[0007] The connection method includes the following steps:

[0008] Step 1: Process the glued laminated timber member. Open a steel plate slot at the middle of the end of the glued laminated timber member, which leads to the top surface of the end of the glued laminated timber member. Open a support plate slot at the lower port of the steel plate slot. The support plate slot and the steel plate slot form an inverted T-shaped slot. Symmetrically open several pairs of bolt holes on both side wall surfaces of the steel plate slot, which lead to the side surfaces of the end of the glued laminated timber member;

[0009] Step 2: Customize the steel member. Vertically weld a connection steel plate on the connection end surface of the steel member and the glued laminated timber member. The thickness of the connection steel plate is less than the width of the steel plate slot on the glued laminated timber member, and the length of the connection steel plate is less than the depth of the steel plate slot. Open several connection holes on the surface of the connection steel plate, which correspond one by one to several pairs of bolt holes on the glued laminated timber member. Fix a support plate at the bottom of the connection steel plate. The width of the support plate is adapted to the width of the support plate slot on the glued laminated timber member. The support plate and the connection steel plate form an inverted T-shaped structure;

[0010] Step 3: Manufacture the steel lining tube. The length of the steel lining tube is equal to half of the difference between the end thickness H of the glued laminated timber member and the width L of the steel plate slot. Fix an annular plate at one end of the steel lining tube. The outer diameter of the annular plate is greater than the outer diameter of the gasket in the fastener. Open several self-tapping screw holes on the surface of the annular plate, which are circumferentially evenly distributed on a circle with a diameter greater than the gasket;

[0011] Step 4: Connect the glued laminated timber member and the steel member, including the following processes:

[0012] Process 1: First, apply a special wood structure adhesive on the outer surfaces of several pairs of steel lining tubes, and then insert several pairs of steel lining tubes into several pairs of bolt holes on the glued laminated timber member one by one. After the adhesive solidifies to form an adhesive layer, install the annular plates on several pairs of steel lining tubes on both side surfaces of the end of the glued laminated timber member respectively through several self-tapping screws one by one;

[0013] Process 2: Insert the connection steel plate on the steel member into the steel plate slot of the glued laminated timber member, so that the support plate at the bottom of the connection steel plate is located in the support plate slot of the glued laminated timber member;

[0014] Process 3: Fit a gasket on the head of each connection bolt in several sets of fasteners, then pass several connection bolts through the steel lining tubes in several pairs of bolt holes on the glued laminated timber member and several connection holes on the connection steel plate one by one. Then fit a gasket on the tail of each of the several connection bolts, and then install several nuts on the outer sides of the gaskets at the tails of the several connection bolts respectively and tighten them preliminarily;

[0015] Step 4: Inject special wood structure adhesive into the steel plate slot from the top surface at the end of the glued laminated timber member until the adhesive overflows from the bottom surface at the end of the glued laminated timber member, so as to form an adhesive layer between the connecting steel plate and the steel plate slot.

[0016] Step 5: After the adhesive in the steel plate slot solidifies, tighten all the nuts again.

[0017] In the above connection method of the glued laminated timber member and the steel member, when performing Step 1, injection holes corresponding to the lower part of the steel plate slot are respectively opened on both side surfaces at the end of the glued laminated timber member, and when performing Step 4, the adhesive is supplemented through the injection holes.

[0018] In the above connection method of the glued laminated timber member and the steel member, when performing Step 2, the thickness of the connecting steel plate is 2 mm smaller than the width of the steel plate slot on the glued laminated timber member, and the length of the connecting steel plate is 5 mm smaller than the depth of the steel plate slot.

[0019] In the above connection method of the glued laminated timber member and the steel member, when performing the step of manufacturing the steel lining tube, the inner diameter of the steel lining tube is 1 mm larger than the diameter of the connecting bolt, and the wall thickness of the steel lining tube is 2 - 3 mm.

[0020] The characteristics of the connection method of the glued laminated timber member and the steel member of the present invention are:

[0021] 1. By bonding the steel lining tube with a ring plate in the bolt hole of the glued laminated timber member, the extrusion force of the connecting bolt on the bolt hole wall of the glued laminated timber member and the side surface at the end of the glued laminated timber member can be effectively dispersed, avoiding permanent extrusion deformation of the wood under pressure.

[0022] 2. By having a ring plate with an outer diameter larger than the gasket at one end of the steel lining tube, the local cross-grain extrusion force formed by the nut and gasket of the fastener can be effectively dispersed.

[0023] 3. By fixing the ring plate of the steel lining tube on the side surface at the end of the glued laminated timber member with self-tapping screws, and through the bonding between the steel lining tube and the hole wall of the bolt hole on the glued laminated timber member and the bonding between the connecting steel plate and the steel plate slot on the glued laminated timber member, the occurrence of wood dry shrinkage can be effectively prevented, ensuring that there is no loosening between the nut and the connecting steel plate. Description of the Drawings

[0024] Figure 1a is the front view of the connection structure of the glued laminated timber member and the steel member in the prior art;

[0025] Figure 1b is Figure 1a the side view of

[0026] Figure 2It is a side view of the glued laminated timber member during Step 1 of the method for connecting a glued laminated timber member and a steel member of the present invention;

[0027] Figure 3a It is a side view of the steel member during Step 2 of the method for connecting a glued laminated timber member and a steel member of the present invention;

[0028] Figure 3b It is Figure 3a the view taken along the A-A direction in

[0029] Figure 4a It is a side view of the steel liner tube during Step 3 of the method for connecting a glued laminated timber member and a steel member of the present invention;

[0030] Figure 4b It is Figure 4a the side view of

[0031] Figure 5a , Figure 5b and Figure 5c correspondingly are the front view, side view and top view during Process 1 of Step 4 of the method for connecting a glued laminated timber member and a steel member of the present invention;

[0032] Figure 6 It is the front view during Process 3 of Step 4 of the method for connecting a glued laminated timber member and a steel member of the present invention;

[0033] Figure 7 It is Figure 6 the side view of

[0034] Figure 8a and Figure 8b are the schematic structural diagrams during Process 4 of Step 4 of the method for connecting a glued laminated timber member and a steel member of the present invention. Detailed Embodiments

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] Please refer to Figures 2 to 8b , for the method for connecting a glued laminated timber member and a steel member of the present invention, six sets of fasteners need to be prepared, and each set of fasteners includes a connecting bolt 3, two washers 31 and a nut 32.

[0037] The method for connecting a glued laminated timber member and a steel member of the present invention includes the following steps:

[0038] Step 1: Process the glued laminated timber member 2. Open a steel plate slot 20 in the middle of the end of the glued laminated timber member 2 that leads to the top surface of the end of the glued laminated timber member 2. Open a support plate slot 20A at the lower port of the steel plate slot 20. The support plate slot 20A and the steel plate slot 20 form an inverted T-shaped slot; symmetrically open six pairs of bolt holes 21 on both side wall surfaces of the steel plate slot 20 that lead to the side surfaces of the end of the glued laminated timber member 2; on both side surfaces of the end of the glued laminated timber member 2, respectively open glue injection holes 22 corresponding to the lower part of the steel plate slot 20 (see Figure 2 ).

[0039] Step 2: Customize the steel member 1. Use a square tube or H-shaped steel as the steel member 1; vertically weld a connecting steel plate 10 on the connecting end surface of the steel member 1 and the glued laminated timber member 2. The thickness of the connecting steel plate 10 is 2 mm less than the width of the steel plate slot 20 on the glued laminated timber member 2, and the length of the connecting steel plate 10 is 5 mm less than the depth of the steel plate slot 20; six connecting holes 11 corresponding one by one to the six pairs of bolt holes 21 on the glued laminated timber member 2 are opened on the surface of the connecting steel plate 10; fix a support plate 10A at the bottom of the connecting steel plate 10 (see Figure 3a ). The width of the support plate 10A is adapted to the width of the support plate slot 20A on the glued laminated timber member 2. The support plate 10A and the connecting steel plate 10 form an inverted T-shaped structure (see Figure 3b ).

[0040] Step 3: Manufacture the steel lining tube 4. The inner diameter of the steel lining tube 4 is 1 mm larger than the diameter of the connecting bolt 3. The wall thickness of the steel lining tube 4 is 2 - 3 mm. The length of the steel lining tube 4 = 1 / 2 (the width of the end of the glued laminated timber member - the width L of the steel plate slot); fix a ring plate 40 at one end of the steel lining tube 4. The outer diameter of the ring plate 40 is larger than the outer diameter of the gasket 31 in the fastener (see Figure 4a ); on the surface of the ring plate 40, 4 - 6 self-tapping screw holes 400 are circumferentially and evenly distributed on a circle with a diameter larger than the gasket 31 (see Figure 4a ).

[0041] Step 4: Connect the glued laminated timber member 2 and the steel member 1, including the following processes:

[0042] Process 1: First, apply a special wood structure adhesive on the outer surfaces of the six pairs of steel lining tubes 4. The adhesive can be phenolic glue or amino plastic condensation glue, and the material properties should meet the relevant requirements of the national standards "Technical Code for Glued Laminated Timber Structures" (GBT50708) and "Code for Acceptance of Construction Quality of Timber Structures" (GB50206); then insert the six pairs of steel lining tubes 4 one by one into the six pairs of bolt holes 21 on the glued laminated timber member 2 (see Figure 5a ). After the adhesive solidifies to form an adhesive layer 5, then install the ring plates 40 on the six pairs of steel lining tubes 4 on the two side surfaces of the end of the glued laminated timber member 2 one by one through 4 - 6 self-tapping screws 41 (see Figure 5band Figure 5c );

[0043] Step 2: Insert the connecting steel plate 10 on the steel member 1 into the steel plate slot 20 of the glued laminated wood member 2, so that the supporting plate 10A at the bottom of the connecting steel plate 10 is located in the supporting plate slot 20A of the glued laminated wood member 2;

[0044] Step 3: Fit a gasket 31 on the head of each connecting bolt 3 in the six sets of fasteners. Then, pass the six connecting bolts 3 through the steel liner 4 in the six pairs of bolt holes 21 on the glued laminated wood member 2 and the six connecting holes 11 on the connecting steel plate 10 respectively. Next, fit a gasket 31 on the tail of each of the six connecting bolts 3. Then, install the six nuts 32 on the outside of the gaskets 31 at the tails of the six connecting bolts 3 respectively and tighten them preliminarily (see Figure 6 and Figure 7 );

[0045] Step 4: Inject the special wood structure adhesive 50 into the steel plate slot 20 from the end top surface of the glued laminated wood member 2 until the adhesive 50 overflows from the end bottom surface of the glued laminated wood member 2 (see Figure 8a ), so as to form an adhesive layer 5 between the connecting steel plate 10 and the steel plate slot 20 (see Figure 8b ). The supporting plate 10A at the bottom of the connecting steel plate 10 can seal the lower port of the steel plate slot 10 to prevent the adhesive 50 in the steel plate slot 20 from leaking further. If the end cross-sectional height of the glued laminated wood member 2 is relatively large, the adhesive can be supplemented through the glue injection hole 22 on the glued laminated wood member 2 to ensure the fullness of the adhesive layer 5;

[0046] Step 5: After the adhesive in the steel plate slot 20 solidifies, tighten all the nuts 32 again.

[0047] In the connection method of the glued laminated wood member and the steel member of the present invention, through the self-tapping screws 41 on the ring plate 40 of the steel liner 4, the adhesive layer 5 between the steel liner 4 and the hole wall of the bolt hole 21 on the glued laminated wood member 2, and the adhesive layer 5 between the connecting steel plate 10 and the steel plate slot 20 on the glued laminated wood member 2, the occurrence of wood shrinkage can be effectively prevented, ensuring that there is no looseness between the nut 32 and the steel connecting plate 10.

[0048] The above embodiments are only for illustrating the present invention, rather than limiting the present invention. Those skilled in the relevant technical fields can also make various transformations or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by each claim.

Claims

1. A method for connecting a laminated wood component to a steel component, which requires preparing several sets of fasteners, each set of fasteners comprising a connecting bolt, two washers and a nut; characterized in that: The connection method comprises the following steps: Step 1: Processing a laminated wood component, opening a steel plate slot at the middle of the end of the laminated wood component and connecting to the top surface of the end of the laminated wood component, opening a support plate slot at the lower end of the steel plate slot, and forming an inverted T-shaped slot with the steel plate slot; symmetrically opening several pairs of bolt holes on the groove walls on both sides of the steel plate slot and connecting to the side surfaces of the end of the laminated wood component; Step 2: Customize the steel component, vertically weld a connecting steel plate on the connecting end surface of the steel component and the glued wood component, the thickness of the connecting steel plate is less than the width of the steel plate slot on the glued wood component, and the length of the connecting steel plate is less than the depth of the steel plate slot; a plurality of connecting holes corresponding to the pairs of bolt holes on the glued wood component are opened on the surface of the connecting steel plate; a supporting plate is fixed at the bottom of the connecting steel plate, the width of the supporting plate is adapted to the width of the supporting plate slot on the glued wood component, and the supporting plate and the connecting steel plate form an inverted T-shaped structure; Step 3, making a steel liner tube, the length of which is equal to the thickness H of the end of the glued wood component minus half of the width L of the steel plate slot; fixing a ring plate at one end of the steel liner tube, the outer diameter of the ring plate being larger than the outer diameter of the gasket in the fastener; opening a plurality of automatic screw holes evenly distributed on the surface of the ring plate on a circle with a diameter larger than the gasket; Step 4, connecting the glulam components to the steel components, includes the following steps: In the first step, a special wood structure adhesive is first applied on the outer surfaces of several pairs of steel liner pipes, and then the several pairs of steel liner pipes are correspondingly inserted into several pairs of bolt holes on the glued wood components. After the adhesive is solidified to form an adhesive layer, the ring plates on the several pairs of steel liner pipes are respectively installed on the two side surfaces of the end of the glued wood components by a plurality of self-tapping screws. Step 2: insert the connecting steel plate on the steel component into the steel plate slot of the laminated wood component so that the support plate at the bottom of the connecting steel plate is located in the support plate slot of the laminated wood component; Step three, a gasket is respectively installed on the head of the connecting bolts in the sets of fasteners, and then the connecting bolts are passed through the steel liner tubes in the pairs of bolt holes on the glued wood components and the connecting holes on the connecting steel plates one by one, and then a gasket is respectively installed on the tail of the connecting bolts, and then the nuts are respectively installed on the outside of the gaskets at the tail of the connecting bolts and preliminarily tightened; Step 4: injecting a special wood structure adhesive into the steel plate slot from the top surface of the end of the glued wood component until the adhesive overflows from the bottom surface of the end of the glued wood component, so that an adhesive layer is formed between the connecting steel plate and the steel plate slot; Step 5: After the adhesive in the steel plate slot solidifies, tighten all the nuts again.

2. The method for connecting a glued laminated wood component and a steel component according to claim 1, characterized in that: When performing step one, glue injection holes are opened on both side surfaces of the end of the glued wood component respectively corresponding to the lower part of the steel plate slot, and when performing process four of step four, adhesive is replenished through the glue injection holes.

3. The method for connecting a glued laminated wood component and a steel component according to claim 1, characterized in that: When performing step 2, the thickness of the connecting steel plate is 2 mm smaller than the width of the steel plate slot on the glued wood component, and the length of the connecting steel plate is 5 mm smaller than the depth of the steel plate slot.

4. The method for connecting a glued laminated wood member and a steel member according to claim 1, characterized in that: When the step of making the steel liner is performed, the inner diameter of the steel liner is 1 mm larger than the diameter of the connecting bolts, and the wall thickness of the steel liner is 2 to 3 mm.

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