An orthogonal connection engineering timber beam shear-torsion connection node

Abstract

This utility model discloses an orthogonal connection joint for shear-torsion resistance of timber beams in engineering projects, comprising a timber cantilever beam, a timber edge beam, an upper anti-torsion connector assembly, a middle anti-shear connector assembly, a lower anti-torsion connector assembly, threaded steel bars with pins, through bolts, shear bolts, and pins. The timber cantilever beam and the timber edge beam are orthogonally arranged and connected by the upper anti-torsion connector assembly, the middle anti-shear connector assembly, and the lower anti-torsion connector assembly. This utility model is mainly used for orthogonal connection of timber cantilever beams and timber edge beams in engineering projects, solving the defect of insufficient shear-torsion resistance of traditional cantilever beam end nodes. It has the advantages of simple structure, modular components, low construction and installation difficulty, prefabrication and assembly, and easy replacement.

Description

Technical Field

[0001] This utility model belongs to the field of building structure engineering technology, and relates to an orthogonal connection engineering timber beam shear-torsion connection node. Background Technology

[0002] Cantilever beams often protrude from the building's outline, highlighting structural features and are widely used in timber-framed buildings. At the ends of cantilever beams, they are typically subjected to torque and shear forces transmitted by the connected edge beams, especially when the edge beams are arranged in an arc. A safe and reliable connection structure is crucial for ensuring effective force transmission between the cantilever beam and the edge beam. Traditional connections primarily use steel filler plates or steel clamp bolt joints, which cannot fully meet the comprehensive requirements of efficient assembly, easy precision control, and resistance to combined shear and torsional forces.

[0003] The connection method of the shear-torsion joint between the cantilever beam and the orthogonally connected edge beam needs to effectively transfer the torque and shear force between the beams, while also meeting the requirements of simple structure, standardized components, ease of construction, and economic rationality. Traditional steel plate bolt joints have several drawbacks. First, the torsional and shear bearing capacities are not clearly defined, and there are situations where the bolts simultaneously resist shear and bending, which poses certain safety hazards. Second, steel filler plate bolt joints require slotting at the ends of the cantilever beam, and due to limitations in processing technology, there are often large slot errors that significantly weaken the wooden beam. Third, bolt joints have low installation efficiency, especially when the cantilever beam is wide, it is difficult to ensure that the bolts can pass smoothly through the wooden beam side members and the steel filler plate, requiring on-site hole enlargement, which poses a risk to structural safety. Utility Model Content

[0004] Purpose of the utility model: To address the aforementioned technical problems, this invention provides an orthogonal connection node for anti-shear and torsion engineering timber beams. By pre-assembling some components in the factory, rapid assembly can be achieved on-site simply by connecting pins or bolts, greatly improving assembly efficiency and avoiding installation errors. Simultaneously, the new node separates the anti-torsion and anti-shear components, each bearing its corresponding internal force. This effectively supports the torque transmitted by the edge-sealing timber beam while ensuring the shear resistance at the node. In the new anti-shear and torsion node, the connection to the timber cantilever beam utilizes steel bars with pin holes in conjunction with pins, reducing the weakening effect on the timber beam ends caused by traditional steel filler plate bolt nodes. Furthermore, the pins are interference-fitted, resulting in a tighter connection to the timber beam compared to bolt nodes, thus enhancing safety and reliability.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] An orthogonal connection engineering timber beam shear-torsion connection node includes a timber cantilever beam, a timber edge beam, an upper anti-torsion connector assembly, a middle anti-shear connector assembly, a lower anti-torsion connector assembly, a threaded steel bar with end and a pin assembly, a through bolt, an anti-shear bolt, and a pin.

[0007] The cross-section of the wooden cantilever beam is rectangular, with steel bar holes and shear-resistant round pipe holes at the ends, and pin holes on the sides, with the two being horizontally orthogonal.

[0008] The side of the wooden edge beam has through bolt holes and shear-resistant round tube holes;

[0009] The wooden cantilever beams and wooden edge beams are arranged orthogonally and are connected by an upper anti-torsion connector group, a middle anti-shear connector group, and a lower anti-torsion connector group.

[0010] The upper anti-torsion connector assembly is located above the wooden cantilever beam and the wooden side beam. It consists of a pair of T-shaped connectors, each of which is orthogonally welded together with a back plate and an ear plate. The T-shaped connector connected to the wooden cantilever beam includes a back plate end and an ear plate end, while the T-shaped connector connected to the wooden side beam includes a back plate end and an ear plate end. The back plate end of the first connector is connected to the wooden cantilever beam via a threaded steel bar and a pin assembly, which includes a threaded steel bar and a pin. The back plate end of the second connector is connected to the wooden side beam using through bolts.

[0011] The lower anti-torsion connector assembly has the same structure and connection method as the upper anti-torsion connector assembly. It is located at the lower part of the wooden cantilever beam and the wooden edge beam, and is symmetrically arranged with the upper anti-torsion connector assembly about the middle anti-shear connector assembly; it resists the torque transmitted by the wooden edge beam at the node.

[0012] The central shear-resistant connector assembly consists of a pair of T-shaped shear-resistant connectors. The T-shaped shear-resistant connector connected to the wooden cantilever beam consists of a back plate, an ear plate, and a shear-resistant round tube. The T-shaped shear-resistant connector connected to the wooden edge beam consists of a second back plate, an ear plate, and a second shear-resistant round tube. The ear plate and the shear-resistant round tube are orthogonally welded to both sides of the back plate, and the ear plate and the shear-resistant round tube are orthogonally welded to both sides of the back plate. The ear plate and the ear plate are connected by shear bolts to provide shear resistance at the joint. One end of the central shear-resistant connector assembly is connected to the end of the wooden cantilever beam via a threaded steel bar, and the other end is connected to the wooden edge beam via a through bolt.

[0013] Preferably, the wooden cantilever beams and wooden edge beams are all engineered wooden beams.

[0014] Preferably, the wooden cantilever beams and wooden edge beams are made of laminated plywood, parallel veneer laminated timber, or stacked veneer laminated timber.

[0015] Preferably, the end of the wooden cantilever beam has an insertion hole with a diameter 1-2 mm larger than the diameter of the threaded steel bar with the end, and the insertion hole depth is not less than 15 times the diameter of the threaded steel bar with the end; the diameter of the hole on the side of the wooden beam is 0.5 mm smaller than the pin.

[0016] The threaded steel bar with ends has equidistant and uniformly spaced insertion holes for connecting pins on its side, and the diameter of the insertion holes is the same as that of the pins; after installation, the threaded steel bar with ends has 3-4 cm of threads exposed on one end of the wooden cantilever beam for fixing nuts.

[0017] The pin passes through both the wooden cantilever beam and the threaded steel bar with end caps.

[0018] Preferably, the wooden side beam has through screw holes on its side, and the diameter of the screw holes is 2-3 mm larger than the diameter of the through bolts.

[0019] Preferably, the two T-shaped connecting parts of the upper anti-torsion connector assembly have an opening at the back plate end of the connecting part on the side connected to the wooden cantilever beam, which is connected to the end of the wooden cantilever beam with a threaded steel rod; on the side connected to the wooden side beam, the back plate end of the connecting part is connected to the wooden side beam by a through bolt, and a large washer is used at the point of direct contact with the wood; the ear plate end of the connecting part and the ear plate end of the connecting part are connected by a pin, and both the ear plate end of the connecting part and the ear plate end of the connecting part have pin holes, the diameter of which is 2-3mm larger than that of the pin.

[0020] Preferably, the back plate of the middle shear connector assembly has a steel bar hole, the diameter of which is 2-3 mm larger than the diameter of the threaded steel bar; the back plate has a bolt hole, the diameter of which is 2-3 mm larger than the diameter of the through bolt; and the ear plate has bolt holes, the diameter of which is 2-3 mm larger than the diameter of the shear bolt.

[0021] The torsional bearing capacity T of the node shall be calculated according to the following formula:

[0022]

[0023] F t =nN t

[0024]

[0025] F t ≤d∑tf c b

[0026] Among them, F t N represents the tensile bearing capacity of the threaded steel bar group; L is the distance between the horizontal lines of the geometric centers of the upper and lower threaded steel bar groups; n is the number of threaded steel bars; N t The tensile bearing capacity of a single threaded steel bar with ends; n v d is the number of shear surfaces of the pin; d is the pin diameter; f v b f is the shear strength of a single shear plane of the pin; c b The bearing strength of the lug plate at the connector;

[0027] Tensile bearing capacity (N) of a single threaded steel bar with ends t It should be calculated according to the following formula:

[0028] N t =nk min t s df es

[0029] Where n is the number of shear surfaces of the pin; k min t is the minimum effective length coefficient for bearing pressure in the pin groove. s The thickness of the pin connecting the thinner or edge component; d is the diameter of the pin; f es This refers to the standard value of the bearing strength of the dowel groove in the direction of the grain of the wooden cantilever beam.

[0030] The shear bearing capacity of this utility model node is jointly borne by the shear-resistant circular tube and the steel bar. The torsional and shear bearing capacities of this utility model node are controlled by the corresponding connection positions of the wooden cantilever beam with the upper torsional connector group, the middle shear connector group, and the lower torsional connector group.

[0031] This utility model discloses a construction method for an orthogonal connection engineering timber beam shear-torsion connection node, comprising the following steps:

[0032] S1: Process wooden cantilever beams and wooden edge beams in the factory, and drill holes for threaded steel bars with ends, pin holes and through bolt holes;

[0033] S2: At the factory, the wooden cantilever beam is fixed to the corresponding upper and lower anti-torsion connectors and the middle anti-shear connector using threaded steel bars with ends;

[0034] The wooden edge beam is fixed to the corresponding upper and lower anti-torsion connectors and the middle anti-shear connector using through bolts;

[0035] S3: On-site, the anti-torsion connector assembly ear plates are connected by pins, and the middle anti-shear connector assembly ear plates are fixed by high-strength bolts, thereby realizing the connection between the wooden cantilever beam and the wooden edge beam.

[0036] The beneficial effects of this utility model are as follows:

[0037] 1. High efficiency: The wooden beams are drilled in the factory and the anti-torsion and anti-shear components are fixed to the wooden components in advance. On-site, the wooden cantilever beams and wooden edge beams are connected only by high-strength bolts and pins, avoiding node construction errors, reducing on-site construction difficulty, and effectively improving the degree of prefabrication and assembly efficiency.

[0038] 2. Safety: The anti-torsion and anti-shear components connecting the wooden beams are connected by high-strength bolts and pins, which respectively bear the torque and shear force at the node. The force is reasonable, the force transmission is clear, and the node performance is safe and reliable. The mechanical connection of steel bar pins effectively avoids the weakening problem caused by slotting at the end of the wooden beam.

[0039] 3. Aesthetics: The standardized design of the connection components can be realized for different types of orthogonal beams, which has strong design adaptability; the steel bar pin mechanical connection avoids the need for slotting and drilling at the ends of wooden beams, thereby reducing damage to the natural wood appearance of wooden components. The nodes proposed by this utility model are simple and beautiful. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structural composition of the orthogonal connection engineering timber beam shear-torsion connection node of this utility model;

[0041] Figure 2 This is a schematic diagram of the orthogonal connection engineering timber beam shear-torsion connection node after assembly according to this utility model;

[0042] Figure 3 This is a schematic diagram showing the distribution of threaded steel bars and pins in an orthogonal connection engineering timber beam shear-torsion connection node according to this utility model;

[0043] Figure 4 This is a schematic diagram of the anti-torsion connector assembly for the orthogonal connection engineering timber beam anti-shear torsion connection node of this utility model;

[0044] Figure 5 This is a schematic diagram of the middle shear connector assembly of the orthogonal connection engineering timber beam shear-torsion connection node of this utility model;

[0045] Figure 6 This is a schematic diagram of the shear-torsion connection node of the orthogonal connection engineering timber beam of this utility model under stress.

[0046] In the diagram: 1 is a wooden cantilever beam, 2 is a wooden side beam, 3 is an upper anti-torsion connector assembly, 4 is a middle anti-shear connector assembly, 5 is a lower anti-torsion connector assembly, 6 is a threaded steel bar with end and a pin assembly, 7 is a through bolt, 8 is an anti-shear bolt, 9 is a pin, 3-1 is the back plate end of connector one, 3-2 is the ear plate end of connector one, 3-3 is the ear plate end of connector two, 3-4 is the back plate end of connector two, 4-1 is anti-shear round pipe one, 4-2 is back plate one, 4-3 is ear plate one, 4-4 is ear plate two, 4-5 is back plate two, 4-6 is anti-shear round pipe two, 6-1 is a threaded steel bar with end, and 6-2 is a pin. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0048] like Figure 1-6 As shown, an orthogonal connection engineering timber beam shear-torsion connection node includes a timber cantilever beam 1, a timber edge beam 2, an upper anti-torsion connector group 3, a middle anti-shear connector group 4, a lower anti-torsion connector group 5, a threaded steel bar with end and a pin group 6, a through bolt 7, an anti-shear bolt 8, and a pin 9.

[0049] The cross-section of the wooden cantilever beam 1 is rectangular, with steel bar holes and shear-resistant round pipe holes at the ends, and pin holes on the sides, with the two being horizontally orthogonal;

[0050] The side of the wooden edge beam 2 has through bolt holes and shear-resistant round pipe holes;

[0051] The wooden cantilever beam 1 and the wooden side beam 2 are arranged orthogonally and are connected by an upper anti-torsion connector group 3, a middle anti-shear connector group 4 and a lower anti-torsion connector group 5.

[0052] The upper anti-torsion connector group 3 is located above the wooden cantilever beam 1 and the wooden side beam 2. It consists of a pair of T-shaped connectors. Each T-shaped connector is formed by orthogonally welding a back plate and an ear plate. The T-shaped connector connected to the wooden cantilever beam 1 includes a back plate end 3-1 and an ear plate end 3-2. The T-shaped connector connected to the wooden side beam 2 includes a back plate end 3-4 and an ear plate end 3-3. The back plate end 3-1 of the connector is connected to the wooden cantilever beam 1 by a threaded steel bar and a pin assembly 6. The threaded steel bar and pin assembly 6 includes a threaded steel bar 6-1 and a pin 6-2. The back plate end 3-4 of the connector is connected to the wooden side beam 2 by a through bolt 7.

[0053] The lower anti-torsion connector group 5 has the same structure and connection method as the upper anti-torsion connector group 3. It is located at the lower part of the wooden cantilever beam 1 and the wooden side beam 2, and is symmetrically arranged with the upper anti-torsion connector group 3 about the middle anti-shear connector group 4.

[0054] The central shear-resistant connector group 4 consists of a pair of T-shaped shear-resistant connectors. The T-shaped shear-resistant connector connected to the wooden cantilever beam 1 consists of a back plate 4-2, an ear plate 4-3, and a shear-resistant round tube 4-1. The T-shaped shear-resistant connector connected to the wooden side beam 2 consists of a back plate 4-5, an ear plate 4-4, and a shear-resistant round tube 4-6. The ear plate 4-3 and the shear-resistant round tube 4-1 are orthogonally welded to both sides of the back plate 4-2, and the ear plate 4-4 and the shear-resistant round tube 4-6 are orthogonally welded to both sides of the back plate 4-5. The ear plate 4-3 and the ear plate 4-4 are connected by shear bolts 8. One end of the central shear-resistant connector group 4 is connected to the end of the wooden cantilever beam 1 through a threaded steel bar 6-1, and the other end is connected to the wooden side beam 2 through a through bolt 7.

[0055] Both the wooden cantilever beam 1 and the wooden edge beam 2 are engineered timber beams. The materials of the wooden cantilever beam 1 and the wooden edge beam 2 are plywood glued laminated timber, parallel wood veneer glued laminated timber, or laminated wood veneer glued laminated timber.

[0056] The wooden cantilever beam 1 has an insertion hole at one end, the diameter of which is 1-2 mm larger than the diameter of the threaded steel rod 6-1, and the insertion hole depth is not less than 15 times the diameter of the threaded steel rod 6-1. The diameter of the hole on the side of the wooden beam 1 is 0.5 mm smaller than that of the pin 6-2. The threaded steel rod 6-1 has equidistant and uniform insertion holes on its side for connecting the pin 6-2, and the diameter of the insertion holes is the same as that of the pin 6-2. After installation, the threaded steel rod 6-1 has 3-4 cm of threads exposed on one end of the wooden cantilever beam 1 for fixing nuts. The pin 6-2 passes through both the wooden cantilever beam 1 and the threaded steel rod 6-1. The wooden side beam 2 has a through bolt hole on its side, the diameter of which is 2-3 mm larger than that of the through bolt 7.

[0057] The two T-shaped connecting parts of the upper anti-torsion connector group 3 have holes at the back plate end 3-1 of the connecting part on the side connected to the wooden cantilever beam 1, and are connected to the wooden cantilever beam 1 with threaded steel rods 6-1 at the end; on the side connected to the wooden side beam 2, the back plate end 3-4 of the connecting part is connected to the wooden side beam 2 by through bolts 7, and a large washer is used at the point of direct contact with the wood; the ear plate end 3-2 of the connecting part and the ear plate end 3-3 of the connecting part are connected by pins 9, and both the ear plate end 3-2 of the connecting part and the ear plate end 3-3 of the connecting part have pin holes, the diameter of which is 2-3mm larger than that of the pin 9.

[0058] The back plate 4-2 of the middle shear connector group 4 has a steel bar hole, the diameter of which is 2-3 mm larger than the diameter of the threaded steel bar 6-1. The back plate 4-5 has a bolt hole, the diameter of which is 2-3 mm larger than the diameter of the through bolt 7. The ear plate 4-3 and ear plate 4-4 have bolt holes, the diameter of which is 2-3 mm larger than the diameter of the shear bolt 8.

[0059] The torsional bearing capacity T of the node shall be calculated according to the following formula:

[0060]

[0061] F t =nN t

[0062]

[0063] F t ≤d∑tf c b

[0064] Among them, F t N represents the tensile bearing capacity of the threaded steel bar group 6-1; L is the distance between the horizontal lines of the geometric centers of the upper and lower threaded steel bar groups 6-1; n is the number of threaded steel bars 6-1; N t The tensile bearing capacity of a single threaded steel bar 6-1 with ends; n v d represents the number of shear surfaces of pin 9; d represents the diameter of pin 9; f represents the shear strength of pin 9.v b f is the shear strength of a single shear plane of pin 9; c b The bearing strength of the lug plate at the connector;

[0065] Tensile bearing capacity (N) of a single threaded steel bar 6-1 t It should be calculated according to the following formula:

[0066] N t =nk min t s df es

[0067] Where n is the number of shear surfaces of pin 6-2; k min t is the minimum effective length coefficient for bearing pressure in the 6-2 pin groove. s d represents the thickness of the thinner or edge component connected by pin 6-2; d represents the diameter of pin 6-2; f represents the thickness of the thinner or edge component connected by pin 6-2. es The standard value of the bearing strength of the dowel groove in the direction of the grain for the wooden cantilever beam 1.

[0068] During construction, steel bar holes, shear component holes, and pin holes are pre-drilled on the wooden cantilever beam at the end face and sides to be connected. One connecting component of the anti-torsion connector assembly is pre-installed at the factory at the corresponding position on the end of the wooden cantilever beam using a threaded steel bar, and fixed on the side with a pin.

[0069] The wooden edge beam has through bolt holes pre-drilled on the end face to be connected. The other connecting component of the anti-torsion connector group and the anti-shear connector group is pre-fixed in the factory at the corresponding position of the wooden edge beam using through bolts, large washers and nuts.

[0070] One side of the shear-resistant component of the central shear-resistant assembly is installed at the factory using threaded steel bars with end caps at the opening position in the middle of the wooden cantilever beam, and the side is pre-fixed with pins; the other side of the shear-resistant component is pre-fixed at the factory using through bolts, large washers, and nuts at the screw hole position in the wooden side beam. The torsional connecting components are connected on-site at the ear plates using pins, and the shear-resistant components are fixed on-site at the ear plates using high-strength bolts, ultimately completing the rapid assembly of the orthogonal connecting beam.

[0071] The embodiments of this utility model patent have been described in detail above with reference to the accompanying drawings, but this utility model patent is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations of these embodiments within the scope of the principles and technical concept of this utility model patent still fall within the protection scope of this utility model patent.

Claims

1. A shear-torsion connection node for a cross-laminated timber beam, characterized in that: It includes a wooden cantilever beam (1), a wooden side beam (2), an upper anti-torsion connector assembly (3), a middle anti-shear connector assembly (4), a lower anti-torsion connector assembly (5), a threaded steel bar and pin assembly (6), a through bolt (7), an anti-shear bolt (8), and a pin (9); The cross section of the wooden cantilever beam (1) is rectangular, with steel bar holes and shear-resistant round pipe holes at the ends, and pin holes on the sides, and the two are horizontally orthogonal. The side of the wooden edge beam (2) has through bolt holes and shear-resistant round pipe holes; The wooden cantilever beam (1) and the wooden side beam (2) are arranged orthogonally and are connected by an upper anti-torsion connector group (3), a middle anti-shear connector group (4) and a lower anti-torsion connector group (5). The upper anti-torsion connector group (3) is located above the wooden cantilever beam (1) and the wooden side beam (2). It consists of a pair of T-shaped connectors. Each T-shaped connector is formed by orthogonally welding a back plate and an ear plate. The T-shaped connector connected to the wooden cantilever beam (1) includes a back plate end (3-1) and an ear plate end (3-2). The T-shaped connector connected to the wooden side beam (2) includes a back plate end (3-4) and an ear plate end (3-3). The back plate end (3-1) of the connector is connected to the wooden cantilever beam (1) by a threaded steel bar and a pin group (6). The threaded steel bar and pin group (6) includes a threaded steel bar (6-1) and a pin (6-2). The back plate end (3-4) of the connector is connected to the wooden side beam (2) by a through bolt (7). The lower anti-torsion connector group (5) has the same structure and connection method as the upper anti-torsion connector group (3), and is located at the lower part of the wooden cantilever beam (1) and the wooden side beam (2), and is symmetrically arranged with the upper anti-torsion connector group (3) about the middle anti-shear connector group (4). The central shear-resistant connector assembly (4) consists of a pair of T-shaped shear-resistant connectors. The T-shaped shear-resistant connector connected to the wooden cantilever beam (1) consists of a back plate (4-2), an ear plate (4-3), and a shear-resistant round tube (4-1). The T-shaped shear-resistant connector connected to the wooden side beam (2) consists of a back plate (4-5), an ear plate (4-4), and a shear-resistant round tube (4-6). The ear plate (4-3) and the shear-resistant round tube (4-1) The ear plate 2 (4-3) and the shear-resistant round tube 2 (4-6) are orthogonally welded to both sides of the back plate 1 (4-2), and the ear plate 2 (4-4) and the shear-resistant round tube 2 (4-6) are orthogonally welded to both sides of the back plate 2 (4-5). The ear plate 1 (4-3) and the ear plate 2 (4-4) are connected by shear-resistant bolts (8). One end of the middle shear-resistant connector group (4) is connected to the end of the wooden cantilever beam (1) through a threaded steel bar (6-1), and the other end is connected to the wooden side beam (2) through a through bolt (7).

2. A shear-torsion connection node for a cross-laminated timber beam according to claim 1, characterized in that: The wooden cantilever beam (1) and the wooden side beam (2) are both engineered wooden beams.

3. A shear-torsion connection node for a cross-laminated timber beam according to claim 2, characterized in that: The wooden cantilever beam (1) and wooden side beam (2) are made of laminated plywood, parallel veneer laminated wood, or stacked veneer laminated wood.

4. A shear-torsion connection node for a cross-laminated timber beam according to claim 3, characterized in that: The wooden cantilever beam (1) has an insertion hole at its end, the diameter of which is 1-2 mm larger than the diameter of the threaded steel bar (6-1) with end, and the insertion hole depth is not less than 15 times the diameter of the threaded steel bar (6-1); the diameter of the hole on the side of the wooden cantilever beam (1) is 0.5 mm smaller than that of the pin (6-2); The threaded steel bar (6-1) with the end has equidistant and uniform insertion holes for connecting pins (6-2) on its side, and the diameter of the insertion holes is the same as that of the pins (6-2); after installation, the end of the threaded steel bar (6-1) exposed on the wooden cantilever beam (1) has 3-4 cm of threads for fixing nuts. The pin (6-2) passes through both the wooden cantilever beam (1) and the threaded steel bar (6-1).

5. The orthogonal connection engineering timber beam shear-torsion connection node according to claim 4, characterized in that: The wooden side beam (2) has through screw holes on its side, and the diameter of the screw holes is 2-3 mm larger than the diameter of the through bolts (7).

6. A shear-torsion connection node for a cross-laminated timber beam according to claim 5, wherein: The upper anti-torsion connector assembly (3) has two T-shaped connecting parts. On the side connected to the wooden cantilever beam (1), the back plate end (3-1) of the connecting part has an opening and is connected to the wooden cantilever beam (1) with a threaded steel rod (6-1). On the side connected to the wooden side beam (2), the back plate end (3-4) of the connecting part is connected to the wooden side beam (2) with a through bolt (7), and a large washer is used at the point of direct contact with the wood. The ear plate end (3-2) of the connecting part and the ear plate end (3-3) of the connecting part are connected with pins (9). Both the ear plate end (3-2) and the ear plate end (3-3) of the connecting part have pin holes, and the diameter of the opening is 2-3 mm larger than that of the pin (9).

7. A shear-torsion connection node for a cross-laminated timber beam according to claim 6, wherein: The back plate one (4-2) of the middle shear connector assembly (4) has a steel bar hole, the diameter of which is 2-3 mm larger than the diameter of the threaded steel bar (6-1). The back plate two (4-5) has a bolt hole, the diameter of which is 2-3 mm larger than the diameter of the through bolt (7). The ear plate one (4-3) and ear plate two (4-4) have bolt holes, the diameter of which is 2-3 mm larger than the diameter of the shear bolt (8).

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