Wood structure latticed shell embedded steel bar assembly type node

Abstract

The invention discloses a wood structure latticed shell embedded steel bar assembly type joint which comprises a wood rod piece, a multidirectional center connecting cylinder, a conversion connecting piece and an embedded steel bar screw rod. The cross section of the wooden pole piece is rectangular, and the end part is provided with a hole; the embedded steel bar screw rod is embedded into the end part of the wood rod piece in a factory; the multidirectional center connecting cylinder is composed of a center steel pipe, divergent rib plates and end plates with holes. The conversion connecting piece is composed of a cross rib plate and a perforated end part, and a circular tube anti-shearing piece is arranged at the end, connected with the wood component, of the conversion connecting piece; one end of the conversion connecting piece is connected with the center connecting cylinder through a double-end bolt, and the other end of the conversion connecting piece is connected with the wood rod piece embedded steel bar screw. According to the wood rod piece, the screw rod is embedded in a factory in advance, the conversion connecting piece is connected, rapid assembly with the multidirectional center connecting cylinder is achieved on site, the problem that the construction error of a bolt steel filling plate joint is large is solved, the construction period is effectively shortened, embedded steel bar assembly of the wood structure latticed shell is achieved, and the construction efficiency is improved. And the joint has the advantages of high joint strength, simple structure, high prefabrication degree and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure engineering, and in particular relates to a wooden structure lattice shell embedded reinforcement assembly node. Background Art

[0002] Wood structure buildings have significant advantages in appearance, construction, earthquake resistance and durability. In recent years, they have gradually developed towards larger spans and greater heights. Spatial structures have achieved rapid development at home and abroad. As an important branch of spatial structures, glulam large-span spatial structures are very consistent with the requirements of large-span spatial structures and have also been rapidly developed and widely used. Among the many spatial wood structure systems, the wood grid shell is very suitable for large-span buildings due to its beautiful shape, few rod types and convenient installation. At the same time, the system has good adaptability and superior economic indicators, which is in line with the requirements of my country's new building industrialization for standardized design, factory production and prefabricated construction. It is an ideal form of large-span spatial wood structure.

[0003] Stability is an important issue that affects the performance and health promotion of wood lattice structures, and the structure and force performance of the wood bar connection nodes are the key to determining the stability of wood lattice. Among the existing wood lattice connection nodes, bolt nodes are a more commonly used node form because of their clear force transmission path and convenient processing. However, in large-span wood lattice, the bolt node area usually has a large number of screws, which makes it difficult to make holes during installation and requires high precision, resulting in complex lattice construction technology, low prefabrication, and low installation efficiency. In addition, bolt nodes have obvious semi-rigid characteristics, weak bending stiffness in the node area, and creep slip problems in the axial direction. In particular, there are certain safety hazards when used in single-layer wood lattice, and they do not meet the requirements of current national standards, and cannot meet the high requirements of assembled nodes for the rapid development of wood lattice. Summary of the invention

[0004] Purpose of the invention: In order to solve the above-mentioned technical problems, a rebar-embedded assembled node for a wood structure lattice shell is provided. By equipping the wood rods with rebar-embedded screws at the ends with conversion connectors, and using stud bolts between the wood rods and the multi-directional center connecting tubes for rapid assembly, the problems of difficult matching of bolt nodes with holes and complicated construction processes are avoided, and the rebar-embedded assembled connection of the wood structure lattice shell is realized, the installation precision requirements are reduced, and the assembly efficiency and the degree of prefabrication of components are improved. At the same time, the new rebar-embedded assembled node can effectively improve the bending stiffness of the node, eliminate the problem of axial creep slip of the bolt node, avoid the damage of the wood lattice shell under the combined action of high axial pressure of the rod and bending moment of the node, or the cracking of the wood at the screw hole due to stress concentration, so as to achieve the goal of improving the stress performance of the lattice shell node and enhancing the stability of the wood lattice shell structure.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A wooden structure lattice shell rebar-embedded assembled node, comprising a multi-directional central connection cylinder, a conversion connection piece, a wooden pole, a rebar-embedded screw group and a screw group; the multi-directional central connection cylinder is connected to the conversion connection piece through the screw group, and the conversion connection piece is connected to the wooden pole through the rebar-embedded screw group;

[0007] The multi-directional central connecting tube comprises a central steel tube, a divergent rib plate and an end plate 1, one end of a plurality of the divergent rib plates is welded to the outer wall of the central steel tube, and the other end is welded to the end plate 1 in a centered and vertically aligned manner, the number of the divergent rib plates is the same as the number of the end plate 1, and the plurality of end plates 1 form a closed circle around the central steel tube;

[0008] The conversion connector comprises a cross rib plate, a second end plate and a shear-resistant circular tube, the two ends of the cross rib plate are respectively orthogonally aligned with the center and welded with the second end plate, the first end plate and the second end plate are both provided with screw holes, the conversion connector is connected to the connecting end of the multi-directional center connecting tube through a screw group between the first end plate and the second end plate, and the conversion connector is welded with a shear-resistant circular tube at the connecting end of the wooden rod;

[0009] The wooden rod is the main component of the wooden lattice shell; the end of the wooden rod is provided with a rebar hole, and a rebar screw group is implanted in advance in the factory using rebar glue; the rebar screw group is connected to the end plate 2 of the conversion connector using nuts; the center position of the end of the wooden rod is provided with a shear groove for connecting the shear-resistant circular tube of the conversion connector.

[0010] Preferably, the cross-section of the wooden rod is rectangular, and the material thereof is ply-glued timber, laminated veneer timber, parallel-laminated timber or laminated-laminated timber.

[0011] Preferably, the positioning axis of the wooden rod is a straight line or an arc curve in a plane, and the ends of the wooden rod are right angles and are aligned and fitted with the second end plate of the conversion connector.

[0012] Preferably, the opening diameter of the rebar embedding hole on the wooden rod is 2-3 mm larger than the rebar embedding diameter of the rebar embedding screw group, which is conducive to the injection of rebar embedding glue; the opening depth is not less than 15 times the rebar embedding diameter to ensure the rebar embedding anchoring length.

[0013] Preferably, the anchor glue is epoxy resin or polyurethane special anchor glue.

[0014] Preferably, the anchor bolt group mainly bears the tensile pressure at the end of the wood bar, and the axial pull-out bearing capacity of the anchor bolt connection should be calculated according to the following calculation method:

[0015] F ax，1 =min{F v ,F t ,F y}

[0016] Fax =0.9n·F ax，1

[0017] Among them, F ax，1 F is the axial pull-out bearing capacity of a single embedded reinforcement; v F is the bearing capacity of the wood around the embedded reinforcement when it is sheared; t F is the bearing capacity of the connected wood member when it is damaged by tension; y F is the bearing capacity of the embedded bar when it yields and fails; ax is the axial pull-out bearing capacity of n anchor bars considering the non-uniform load coefficient;

[0018] The bearing capacity of the wood around the embedded reinforcement when it is sheared v , should be calculated according to the following formula:

[0019] F v =f v ·π·d equ ·l a

[0020] Among them, f v is the shear strength of wood along the grain; d equ The smaller value between the diameter of the rebar hole and 1.25 times the diameter of the rebar; l a is the anchorage length of the rebar;

[0021] The bearing capacity F of the connected wood member when it is damaged by tension t , should be calculated according to the following formula:

[0022] F t =f t ·A n

[0023] Among them, f t Wood tensile strength along the grain; A n Net cross-sectional area of ​​the connected timber members;

[0024] The bearing capacity F of the rebar when it yields y , should be calculated according to the following formula:

[0025]

[0026] Among them, f yr is the yield strength of the embedded bar; d r is the nominal diameter of the rebar.

[0027] Preferably, the cross-section of the central steel pipe of the multi-directional central connecting cylinder is circular or regular polygonal.

[0028] Preferably, when the cross-section of the central steel pipe is circular, the divergent ribs converge at the center of the circle; when the central steel pipe is a regular polygon, the divergent ribs are located on the perpendicular bisectors of each side of the regular polygon.

[0029] Preferably, the divergent ribs are perpendicular to the central steel pipe or at a certain angle within the rib surface, and the angle is determined by the angle between the wooden rod and the positioning axis of the central steel pipe.

[0030] As a preferred embodiment, the shear-resistant circular tube has a shear bearing capacity F τ It should be calculated according to the following formula:

[0031] F τ =f c D dot

[0032] Among them, f c D is the cross-grain compressive strength of the end of the wood bar; dot is the outer diameter of the shear-resistant circular tube.

[0033] The present invention discloses a wooden structure lattice shell rebar-embedded assembled node, which includes a multi-directional center connection tube, a wooden rod, and a conversion connector. A rebar-embedded hole is opened in advance at the end of the wooden rod in the factory, and a screw group is implanted using rebar-embedded glue; a circular notch is opened at the end of the wooden rod, and a corresponding circular tube is welded to the end of the conversion connector connected thereto, and the two are assembled in the factory, and stud bolts are used on site to realize spatial assembly with the multi-directional center connection tube; the cross rib plate can also be made of circular steel pipe or square steel pipe, and is arranged in the center, which does not affect the bolt connection of the end plate of the conversion connector. The conversion connector is connected to the center connection tube by a bolt group, and the bolt group simultaneously bears the shear force and bending moment at the connection; the conversion connector is connected to the wooden rod by a rebar group, and the rebar group only bears the tensile pressure; the shear-resistant steel pipe at the connection end of the conversion connector and the wooden rod bears the shear force at the connection.

[0034] The construction method of the wooden structure lattice shell embedded reinforcement assembled node comprises the following steps:

[0035] S1: The factory processes wooden poles, opens holes for embedding reinforcement and opens notches for shear-resistant circular tubes;

[0036] S2: Assemble the wooden pole and one end of the conversion connector through the rebar group in the factory;

[0037] S3: On site, assemble the other end of the replacement connection piece with the multi-directional center connection tube through a bolt group to complete the connection between the single wooden pole and the multi-directional center connection tube; other wooden poles are connected in the same way to form a wooden structure grid shell as a whole.

[0038] The beneficial effects of the present invention are:

[0039] 1. High efficiency: The ends of the wooden poles are planted with steel bars in the factory and pre-connected with the conversion connectors. On site, they can be connected to the multi-directional central connecting tube only by bolts, avoiding the problems of difficult hole alignment and large construction errors of traditional bolt nodes. The planted steel bar assembly connection of the wooden structure lattice shell is realized, which reduces the installation accuracy requirements and improves the assembly efficiency and the degree of prefabrication.

[0040] 2. Safety: The shear grooves at the ends of the wooden poles and the round tubes at the ends of the conversion connectors are pre-assembled in the factory. Together with the rebar screws at the ends of the wooden poles, they bear the shear force and bending moment at the nodes respectively. The force is reasonable, and the force transmission path is clearer than that of bolt nodes. It can also effectively improve the bending stiffness of the nodes, eliminate the axial creep and slip problems of the group bolt nodes, and avoid the damage of the wooden lattice shell members under the combined action of high axial pressure and node bending moment, or the cracking of the wood at the screw holes due to stress concentration.

[0041] 3. Aesthetics: The anchor bar assembly node proposed by the present invention is simple and beautiful; modular design of wooden poles and connectors can be realized for different types of wooden lattice shells, and the design has strong adaptability; all connections are within the same height range of wooden poles, and there are no metal connections exceeding the height of wooden poles, which is more beneficial to the installation of roof surface layers and bottom decoration; the anchor bar connection reduces the grooving and drilling on the sides of wooden poles, thereby reducing damage to the natural wooden appearance of wooden poles. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the composition structure of the wooden structure lattice shell embedded reinforcement assembly node of the present invention;

[0043] Figure 2 It is a structural schematic diagram of a pair of force-bearing components of the wooden structure embedded reinforcement assembled lattice shell of the present invention;

[0044] Figure 3 It is a structural schematic diagram of the multi-directional central connection tube of the wooden structure lattice shell embedded reinforcement assembly node of the present invention;

[0045] Figure 4 It is a structural schematic diagram of the wooden structure lattice shell embedded reinforcement assembled node conversion connector of the present invention;

[0046] Figure 5 It is a structural schematic diagram of the reinforced wood member at the end of the wood structure lattice shell of the present invention;

[0047] Figure 6 It is a schematic diagram of the structure of the wooden structure embedded reinforcement assembled lattice shell node after assembly of the present invention;

[0048] Figure 7 It is a schematic top view of the structure of the assembled wooden structure reinforced concrete lattice shell node of the present invention;

[0049] Figure 8This is a structural schematic diagram of the conversion connector after the reinforcing bar of the wooden pole is installed;

[0050] Fig. 9 This is a schematic structural diagram of a group of flat force-bearing components after assembly of the present invention;

[0051] Fig.10 It is a schematic structural diagram of a pair of oblique force-bearing components after assembly of the present invention;

[0052] In the figure: 1 is a multi-directional central connecting tube, 2 is a conversion connecting piece, 3 is a wooden rod, 4 is a group of reinforcing bar screws, 5 is a group of bolts, 6 is a nut, 1-1 is a central steel pipe, 1-2 is a divergent rib plate, 1-3 is an end plate one, 2-1 is a cross rib plate, 2-2 is an end plate two, 2-3 is an end plate two, 2-4 is a shear-resistant circular tube, 3-2 is a reinforcing bar hole, 3-1 is a shear-resistant slot, 6-1 is a nut one, 6-2 is a nut two, and 6-3 is a nut three. DETAILED DESCRIPTION

[0053] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] Example 1: Figure 1-8 As shown, the present embodiment provides a wooden structure lattice shell rebar assembly node, comprising a wooden rod 3, a multi-directional center connecting tube 1, a conversion connecting member 2, a rebar screw group 4, a bolt group 5 and a nut 6; a rebar hole 3-2 and a shear groove 3-1 are opened at the end of the wooden rod 3, and the rebar screw group 4 is implanted with rebar glue in the factory; the multi-directional center connecting tube 1 and the conversion connecting member 2 are connected with the bolt group 5 by nut three 6-3 on the inside and nut two 6-2 on the outside; the conversion connecting member 2 includes a cross rib plate 2-1, the conversion connecting member 2 is located between the multi-directional center connecting tube 1 and the wooden rod 3, and a metal shear-resistant circular tube 2-4 is provided at the connecting end with the wooden rod 3, one end is connected to the multi-directional center connecting tube 1 by a bolt group 5, and the other end is connected to the rebar screw group 4 at the end of the wooden rod 3 by a nut one 6-1 and an end plate two 2-3.

[0055] The stud bolt group between the conversion connector 2 and the multi-directional center connecting tube 1 simultaneously bears the shear force and bending moment at the connection; the reinforcing bar screw group 4 between the conversion connector 2 and the wooden rod 3 only bears the tensile pressure; the shear-resistant circular tubes 2-4 between the conversion connector 2 and the wooden rod 3 bear the shear force at the node, forming a reliable connection node.

[0056] The multi-directional central connecting tube 1 is composed of a central steel pipe 1-1, a divergent rib plate 1-2 and an end plate 1-3. The end plate is provided with screw holes for connecting with corresponding screw holes of the end plate 2-2 of the conversion connector 2.

[0057] The central steel pipe 1-1 of the multi-directional central connecting tube 1 is circular, and the divergent ribs 1-2 converge at the center of the circle.

[0058] The end of the divergent rib 1-2 is provided with an end plate 1-3, and is welded to the end plate 1-3 in a centered and vertically aligned manner.

[0059] like Fig. 9 As shown, the positioning axis of the wooden rod 3 is an arc curve, ensuring that the axis of the end of the wooden rod 3 is always flush with the multi-directional center connecting tube 1 and the conversion connecting member 2 on the same horizontal plane; the direction of the axis of the end of the wooden rod 3 is perpendicular to the central axis of the central steel pipe 1-1 of the multi-directional center connecting tube 1.

[0060] The wooden rod 3 has a rectangular cross section and is made of laminated wood.

[0061] The diameter of the rebar hole 3-2 at the end of the wooden rod 3 is 2-3mm larger than the rebar diameter of the rebar screw group 4, and the hole depth is not less than 15 times the rebar diameter to ensure the thickness and quality of the rebar glue. The rebar glue is epoxy resin.

[0062] During the construction of the present invention, the wooden pole member 3 is processed in advance in the factory, and the anchor hole 3-2 and the shear groove 3-1 are opened; the wooden pole member 3 and one end of the conversion connector 2 are assembled in the factory through the anchor screw group 4 in combination with the nut one 6-1; on site, the other end of the conversion connector 2 is assembled with the multi-directional center connecting tube 1 through the bolt group 5 in combination with the nut two 6-2 and the nut three 6-3 to complete the connection between the single wooden pole member 3 and the multi-directional center connecting tube 1; other wooden pole members 3 are connected in the same way, and finally the rapid assembly of the wooden lattice shell is completed.

[0063] Embodiment 2:

[0064] This embodiment is basically the same as Embodiment 1, except that:

[0065] like Fig.10 As shown, in this embodiment, there is a certain angle between the wooden rod member 3 at the lattice node and the multi-directional central connecting tube 1 in the plane, which is achieved by changing the angle between the divergent ribs 1-2 and the central steel pipe 1-1 in the multi-directional central connecting tube; the angle is consistent with the angle between the positioning axis of the wooden rod member 3 and the positioning axis of the central steel pipe 1-1. At this time, the wooden rod member 3 is processed into a straight line segment.

[0066] Embodiment 3:

[0067] This embodiment is basically the same as Embodiment 1 and Embodiment 2, except that:

[0068] The central steel pipe 1 - 1 of the multi-directional central connecting tube 1 is a regular polygon, and the number of sides is the same as the number of the divergent ribs 1 - 2 , the end plates 1 - 3 and the wooden rods 3 .

[0069] The above is a detailed description of the implementation methods of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the described implementation methods. For ordinary technicians in this field, within the scope of the principles and technical ideas of the present invention, various changes, modifications, substitutions and deformations of these implementation methods still fall within the protection scope of the present invention.

Claims

1. A wooden structure lattice shell rebar-embedded assembly node, characterized in that: It comprises a multi-directional central connection cylinder (1), a conversion connection piece (2), a wooden pole piece (3), a reinforcement screw group (4) and a screw group (5); the multi-directional central connection cylinder (1) is connected to the conversion connection piece (2) via the screw group (5), and the conversion connection piece (2) is connected to the wooden pole piece (3) via the reinforcement screw group (4); The multi-directional central connecting tube (1) comprises a central steel tube (1-1), a divergent rib plate (1-2) and an end plate one (1-3); one end of a plurality of the divergent rib plates (1-2) is welded to the outer wall of the central steel tube (1-1), and the other end is welded to the end plate one (1-3) in a centered and vertically aligned manner; the number of the divergent rib plates (1-2) is the same as the number of the end plates one (1-3); and the plurality of end plates one (1-3) surround the central steel tube (1-1) to form a closed circle; The conversion connecting piece (2) comprises a cross rib plate (2-1), an end plate 2 and a shear-resistant circular tube (2-4); the two ends of the cross rib plate (2-1) are respectively welded with the end plate 2 in an orthogonal and center-aligned manner; the end plate 1 (1-3) and the end plate 2 are both provided with screw holes; the connection end of the conversion connecting piece (2) and the multi-directional center connecting tube (1) is connected via a screw rod group (5) between the end plate 1 (1-3) and the end plate 2 (2-2); the connection end of the conversion connecting piece (2) and the wooden rod (3) is welded with the shear-resistant circular tube (2-4); The end of the wooden rod (3) is provided with a reinforcement hole, and a reinforcement screw group (4) is implanted by using reinforcement glue; the reinforcement screw group (4) is connected to the second end plate (2-3) of the conversion connector (2) by using a nut (6); and the center position of the end of the wooden rod (3) is provided with a shear-resistant notch for connecting the shear-resistant circular tube (2-4) of the conversion connector (2).

2. A wooden structure lattice shell rebar-embedded assembled node according to claim 1, characterized in that: The cross section of the wooden rod (3) is rectangular and is made of laminated wood, veneer laminated wood, parallel wood-chip laminated wood or laminated wood-chip laminated wood.

3. A wooden structure lattice shell embedded reinforcement assembly node according to claim 1, characterized in that: The positioning axis of the wooden rod (3) is a straight line or an arc curve in a plane, and the ends of the wooden rod (3) are all right angles and are aligned and fitted with the second end plate (2-3) of the conversion connector (2).

4. The wooden structure lattice shell embedded reinforcement assembly node according to claim 1, characterized in that: The opening diameter of the reinforcement hole on the wooden rod (3) is 2-3 mm larger than the reinforcement diameter of the reinforcement screw group (4), and the opening depth is not less than 15 times the reinforcement diameter.

5. The wooden structure lattice shell embedded reinforcement assembly node according to claim 1, characterized in that: The rebar embedding glue is epoxy resin or polyurethane special rebar embedding glue.

6. The wooden structure lattice shell embedded reinforcement assembly node according to claim 1, characterized in that: The anchor bolt group (4) mainly bears the tensile pressure at the end of the wooden rod (3). The axial pull-out bearing capacity of the anchor bolt connection should be calculated according to the following calculation method: F ax，1 =min{F v ,F t ,F y } <h2 style=";text-align:left;direction:ltr">F<h2 style=";text-align:left;direction:ltr"> ax <h2 style=";text-align:left;direction:ltr"> =0.9nF<h2 style=";text-align:left;direction:ltr"> ax，1 Among them, F ax，1 F is the axial pull-out bearing capacity of a single embedded reinforcement; v F is the bearing capacity of the wood around the embedded reinforcement when it is sheared; t F is the bearing capacity of the connected wood member when it is damaged by tension; y F is the bearing capacity of the embedded bar when it yields and fails; ax is the axial pull-out bearing capacity of n anchor bars considering the non-uniform load coefficient; The bearing capacity F of the wood around the embedded reinforcement when it is sheared v , should be calculated according to the following formula: F v =f v ·π·d equ ·l a Among them, f v is the shear strength of wood along the grain; d equ The smaller value between the diameter of the rebar hole and 1.25 times the diameter of the rebar; l a is the anchorage length of the rebar; The bearing capacity F of the connected wood member when it is damaged by tension t , should be calculated according to the following formula: F t =f t ·A n Among them, f t Wood tensile strength along the grain; A n Net cross-sectional area of ​​the connected timber members; The bearing capacity F of the rebar yield failure y , should be calculated according to the following formula: Among them, f yr is the yield strength of the embedded bar; d r is the nominal diameter of the rebar.

7. The wooden structure lattice shell embedded reinforcement assembly node according to claim 1 is characterized by: The cross section of the central steel pipe (1-1) of the multi-directional central connecting tube (1) is circular or regular polygonal.

8. The wooden structure lattice shell embedded reinforcement assembly node according to claim 7, characterized in that: When the cross section of the central steel pipe (1-1) is circular, the divergent ribs (1-2) converge at the center of the circle; when the central steel pipe (1-1) is a regular polygon, the divergent ribs (1-2) are located on the perpendicular bisectors of the sides of the regular polygon.

9. The wooden structure lattice shell embedded reinforcement assembly node according to claim 1, characterized in that: The divergent ribs (1-2) are perpendicular to the central steel pipe (1-1) or have a certain angle within the rib surface, and the angle is determined by the angle between the wooden rod (3) and the positioning axis of the central steel pipe (1-1).

10. The wooden structure lattice shell embedded reinforcement assembly node according to claim 1, characterized in that: The shear-resistant circular tube (2-4) has a shear bearing capacity F τ It should be calculated according to the following formula: F τ =f c D dot Among them, f c D is the cross-grain compressive strength of the end of the wood bar; dot is the outer diameter of the shear-resistant circular tube.

Images