Flitch extended range type deformation thread anchoring one-way bolt connecting structure and assembling method

Abstract

The invention relates to a flitch extended range type deformation thread anchoring one-way bolt connecting structure and an assembling method. The flitch extended range type deformation thread anchoring one-way bolt connecting structure comprises a screw rod, an I-shaped steel beam, a flitch and a closed rectangular steel pipe column. Mounting holes are formed in the I-shaped steel beam, the flitch plate and the closed rectangular steel pipe column, the mounting holes in the I-shaped steel beam are smooth holes, the mounting holes in the flitch plate and the closed rectangular steel pipe column are threaded holes, and a screw sequentially penetrates through the mounting holes in the I-shaped steel beam, the flitch plate and the closed rectangular steel pipe column and is connected with internal threads of the threaded holes through surface threads; and the flitch and the internal thread form of the threaded hole in the closed rectangular steel pipe column are multi-step inclined planes. Compared with the prior art, the invention has the advantages of compact structure, high bearing capacity, wide application scene range and the like.

Description

Technical Field

[0001] The invention relates to the structural engineering field of building engineering technology, and in particular to a plate-attaching extended-range deformed thread anchoring one-way bolt connection structure and an assembly method. Background Art

[0002] In the field of steel structure engineering, compared with open section steel members, closed section steel members have the following advantages: the cross-sectional radius of gyration of closed section steel members is much larger than that of the former, and their local stability, bending stiffness, torsional stiffness and other mechanical parameters are significantly improved compared with the former. At present, closed section steel members are commonly connected by welding and bolting. Steel structure welded nodes often show brittle failure in earthquake disasters and cannot fully utilize the performance of the material itself. In contrast, bolted connection nodes are mostly semi-rigid and have better seismic performance. Therefore, it is recommended to be widely used in engineering.

[0003] However, the closed cross-section results in a lack of construction space for ordinary high-strength bolts. To address this problem, several connection methods have been proposed, such as internal partition, through partition, and external stiffening ring plate, all of which require a lot of on-site welding work; or traditional bolt end plate connection is used, first opening a temporary installation hole on the wall of the steel pipe column to tighten the nut, and then repair welding the installation hole. The cutting and repair welding operations in the traditional bolt end plate connection not only affect the integrity of the steel pipe column, but also cause residual stress in the structure, reducing the structural bearing capacity.

[0004] In recent years, single-sided bolts that can be installed and tightened on one side have been used as a new type of fastener in closed section node connections. Currently, common single-sided bolts include sleeve deformation anchoring single-sided bolts, through-core bolts, folded gaskets and threaded anchoring one-way bolts. The sleeve deformation anchoring single-sided bolt mainly deforms the sleeve on the bolt by pulling the screw outward, and then expands the inner anchor head on the inside of the steel pipe column to achieve the anchoring effect. Through-core bolts are mainly tension bolts that rely on the column wall to form an anchoring effect. The folded gasket single-sided bolt first installs the various parts of the bolt on a special installation tool, inserts the bolt into the bolt hole, and then unfolds the folded gasket to use the gasket to play an anchoring role. The threaded anchoring one-way bolt mainly anchors the bolt rod by machining threads on the bolt hole of the column wall to replace the traditional nut.

[0005] Casing deformation anchored single-sided bolts and folded gasket single-sided bolts require special processing and manufacturing processes and installation tools, which are costly, require high construction precision, and are complex to install; through-core bolts are prone to premature buckling of the column wall during construction. In contrast, threaded anchored single-sided bolts have significant advantages. Because they use ordinary high-strength bolts, they do not require special installation tools, are more economical and convenient, and have broad application prospects in closed section connections of steel structures.

[0006] A large number of studies have shown that the load of threaded anchor bolts is distributed according to the hyperbolic cosine function. The thread at the end of the bolt bears most of the load. The "face-to-face" contact between the thread and the thread causes the tension in the stud to not be evenly transmitted to multiple threads. When the wall thickness of the anchor is too thin, the thread length is insufficient and the yield line length on the anchor plate is insufficient, which in turn causes the thread to be stripped. When the thickness of the connecting plate is small, the connecting piece will also be pulled off and damaged due to the shearing of the thread teeth. At the same time, when the wall of the steel pipe column is thin, the wall is prone to out-of-plane deformation under the action of the bolt tension, thereby limiting the increase in the bearing capacity of the node.

[0007] In the current field of structural engineering, the hole-making technology for bolt connection by tapping holes in plates is relatively backward, and the mature technology of deformed thread in the mechanical field has not been generally adopted; the closed section "lining" reinforcement structure commonly used in current reinforcement methods ignores the objective fact that the interior of the closed section is difficult to reach, which is inconvenient for construction and unfavorable for manufacturing;

[0008] Therefore, it is an urgent problem to adopt a new connection method to realize the deformed thread anchor structure of the closed-section one-way bolt connection and its anchor length extension method, so as to conveniently and quickly improve the tensile bearing capacity of the threaded anchor one-way bolt connection. Summary of the invention

[0009] The purpose of the present invention is to overcome the defects of the above-mentioned prior art such as insufficient thread length and insufficient yield line length on the anchor plate, which in turn cause thread stripping and pull-out damage due to shearing of thread teeth, and to provide a plate-attached extended-range deformed thread anchored one-way bolt connection structure and assembly method.

[0010] The purpose of the present invention can be achieved by the following technical solutions:

[0011] According to one aspect of the present invention, there is provided a plate-extended range deformable threaded anchor one-way bolt connection structure, comprising a screw rod, an I-beam, a plate and a closed rectangular steel pipe column; the I-beam, the plate and the closed rectangular steel pipe column are all provided with mounting holes, the mounting holes on the I-beam are smooth holes, and the mounting holes on the plate and the closed rectangular steel pipe column are threaded holes, the screw rod passes through the mounting holes on the I-beam, the plate and the closed rectangular steel pipe column in turn, and is connected to the internal threads of the threaded holes through surface threads; the internal thread tooth profile of the threaded holes on the plate and the closed rectangular steel pipe column is a multi-step inclined surface.

[0012] Furthermore, the multi-step bevel has a cross-sectional edge of a tooth profile composed of three broken lines, and the three broken lines include an acute-angle vertex and an obtuse-angle vertex. The acute-angle vertex is located on the screw-out end side, and the obtuse-angle vertex is located on the screw-in end side.

[0013] Furthermore, the screw is a standard industrial screw with a surface thread being a standard thread.

[0014] Furthermore, the tip of the thread section on the surface of the screw rod is located on the fold line between the acute angle vertex and the obtuse angle vertex of the three-segment fold line section.

[0015] Furthermore, the plate is fixedly connected to the closed rectangular steel pipe column.

[0016] Furthermore, the internal threads of the threaded holes on the plate and the closed rectangular steel pipe column are formed by processing the connection holes after the plate and the closed rectangular steel pipe column are fixedly connected.

[0017] Furthermore, the connection method for fixing the plate to the closed rectangular steel pipe column is welding.

[0018] Furthermore, the patch includes a point-type patch and a large patch. The point-type patch has one mounting hole; the large patch has multiple mounting holes for matching with the mounting holes at the flange of the I-beam.

[0019] Furthermore, the thickness of the board is selected according to the connection requirements.

[0020] According to another aspect of the present invention, there is provided a method for assembling a plate-attached extended-range deformable thread anchored one-way bolt connection structure, comprising the following steps:

[0021] Choose the appropriate thickness of the board according to the actual project needs;

[0022] The plate is welded to the corresponding position of the connection hole of the closed rectangular steel pipe column, so that the plate and the closed rectangular steel pipe column form a combined anchor;

[0023] The connection holes on the combined anchors are tapped to form continuous multi-step inclined internal threads in the connection holes between the plate and the closed rectangular steel pipe column;

[0024] Align the connection hole of the I-beam with the connection hole of the combined anchor, insert the screw through the connection hole and tighten it.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. The plate-type extended-range deformed threaded anchor one-way bolt connection structure and assembly method of the present invention are based on the existing threaded anchor one-way bolt connection method. On the basis of the basic connection structure of the screw rod, I-beam and closed rectangular steel pipe column, a point-type plate or a large plate is first welded at a predetermined hole position to form a combined anchor of "closed section wall + plate", and then holes are made and grooves are made on the assembly, and the internal thread profile of the anchor hole or the stud profile is adjusted from a plane to a multi-step inclined surface or arc surface, so as to change the contact state between the screw hole and the bolt, effectively realize the relatively uniform distribution of the internal tension of the stud between the multiple threads in the screw hole, effectively reduce the probability of "thread stripping" damage of the threaded anchor, and improve the tensile strength of the one-way bolt connection.

[0027] 2. The thickness of the plate in the present invention can be determined according to the actual engineering needs, and the thread length can be actually increased to avoid the "thread stripping" problem caused by insufficient thread length, thereby improving the tensile strength of the one-way bolt connection. It is especially suitable for one-way bolt connections of closed high-strength steel components with small wall thickness but high connection strength requirements, and one-way bolt connections of closed components of aluminum alloy structures with soft materials and tapping hardness that cannot meet the high-strength connection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is an overall schematic diagram of the present invention;

[0029] Figure 2 It is a schematic cross-sectional view of the present invention as a whole;

[0030] Figure 3 This is a cross-sectional view of the one-way bolt connection structure for the plate extension deformed thread anchor;

[0031] Figure 4 is a schematic diagram of a screw;

[0032] Figure 5 This is a schematic diagram of an I-beam;

[0033] Figure 6 is a schematic diagram of a combined anchor;

[0034] Figure 7 It is a cross-sectional schematic diagram of point-type panel connection;

[0035] Figure 8 It is a schematic diagram of the engagement between the screw and the internal thread;

[0036] Fig. 9 It is a cross-sectional view of the engagement state of the screw and the internal thread;

[0037] Fig.10 A schematic diagram showing the comparison of the actual yield lines of the tensile failure of the one-way bolt connection surface of the present invention and the tensile failure of the traditional bolt;

[0038] In the figure, 1, screw; 2, I-beam; 21, smooth hole; 3, plate; 31, threaded hole; 32, weld; 33, point plate; 34, large plate; 4, closed rectangular steel pipe column; DETAILED DESCRIPTION

[0039] 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 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 should fall within the scope of protection of the present invention.

[0040] This embodiment relates to a plate-mounted extended-range deformed thread anchored one-way bolt connection structure, such as Figure 1-Figure 5 As shown, it includes a screw rod 1, an I-beam 2, a plate 3 and a closed rectangular steel pipe column 4, wherein the plate 3 and the closed rectangular steel pipe column 4 are connected by welding; the I-beam 2, the plate 3 and the closed rectangular steel pipe column 4 are all provided with mounting holes, the mounting hole on the I-beam 2 is a smooth hole 21, and the mounting holes on the plate 3 and the closed rectangular steel pipe column 4 are threaded holes 31, and the screw rod 1 passes through the mounting holes on the I-beam 2, the plate 3 and the closed rectangular steel pipe column 4 in turn, and cooperates with the internal thread of the threaded hole through the surface thread.

[0041] In particular, the internal thread profiles of the threaded holes 31 on the plate 3 and the closed rectangular steel pipe column 4 are multi-step slopes. Figure 6-Figure 8 As shown, the multi-step bevel is composed of three broken lines forming the cross-sectional edge of the internal thread profile. The three broken lines include an acute-angle vertex and an obtuse-angle vertex. The acute-angle vertex is located at the screw-out end side of the screw 1, and the obtuse-angle vertex is located at the screw-in end side of the screw 1, which is used to bear unidirectional loads. In addition, the screw 1 is an industrial screw standard part with a standard surface thread. The tip of the surface thread section of the screw 1 is located on the broken line between the acute-angle vertex and the obtuse-angle vertex of the three-segment broken line section. At this time, the initial contact state of the thread-thread should be a "point-surface" contact state, so as to make full use of the plastic development of the thread end and realize the relatively uniform distribution of the internal tension of the stud between multiple turns of thread in the screw hole.

[0042] In this embodiment, the plate 3 is fixedly connected to the closed rectangular steel pipe column 4. As a preferred embodiment, the fixed connection is performed by welding, and the weld 32 between the plate 3 and the closed rectangular steel pipe column 4 is located on both sides of the plate 3. Fig. 9 As shown, in a specific embodiment, the plate 3 includes a point plate 33 and a large plate 34. The point plate 33 is welded at a predetermined connection hole position on the wall of the closed rectangular steel pipe column 4, and a weldable large plate 34 is welded at a predetermined connection hole position near the flange of the I-beam 2, to form a combined anchor of "closed section wall + plate", and then a multi-step bevel thread is engraved on the assembly.

[0043] In this embodiment, the number of mounting holes on the point-type plate 33 is one, which is welded to a single mounting hole on the closed rectangular steel pipe column 4; the number of mounting holes on the large plate 34 is multiple, which is used to cooperate with multiple mounting holes on the flange of the I-beam 2. The combined anchor in this embodiment includes two point-type plates 33 and two large plates 34, each of which has four connecting holes distributed on both sides of the point-type plate 33.

[0044] As a preferred embodiment, the thickness of the plate 3 can be determined according to the actual engineering needs, and the thread length can be actually increased to avoid the "thread stripping" problem caused by insufficient thread length, thereby improving the tensile strength of the one-way bolt connection. The point plate 33 and the large plate 34 can also avoid stress concentration, increase the actual yield line length of the tensile damage of the thread anchored one-way bolt connection surface, and improve the tensile strength of the one-way bolt connection. Fig.10 As shown, the dotted line enclosed area is a comparison of the rigidity areas of the connection structure of the present invention and the traditional connection structure during connection, wherein the left side is a plate-attached extended-range deformed threaded anchor one-way bolt tensile connection, and the right side is a traditional threaded anchor unilateral bolt connection.

[0045] This embodiment also provides an assembly method for a plate-attached extended-range deformed thread anchored one-way bolt connection structure, which is characterized by comprising the following steps:

[0046] Select the appropriate thickness of the board according to the actual project needs 3;

[0047] Weld the plate 3 to the corresponding position of the connection hole of the closed rectangular steel pipe column 4, so that the plate 3 and the closed rectangular steel pipe column 4 form a combined anchor;

[0048] The connection holes on the combined anchor are tapped to form continuous multi-step inclined internal threads in the connection holes between the plate 3 and the closed rectangular steel pipe column 4;

[0049] Align the connection hole of the I-beam 2 with the connection hole of the combined anchor, and insert the screw 1 through the connection hole and tighten it.

[0050] The plate-extended deformed threaded anchored one-way bolt connection method proposed in the present invention forms a "closed section wall + plate" combined anchor by spot welding a small distributed plate or connecting plates on the outside of the closed section, which not only increases the actual yield line length of the threaded anchored one-way bolt connection surface for tensile damage, but also increases the effective length of tapping, thereby greatly improving the tensile resistance of the closed section threaded anchored one-way bolt connection. At the same time, by changing the "face-to-face" contact state between the thread and the thread, that is, using the deformed thread to achieve "point-to-face" contact, the thread is driven to develop plastically under the action of tension, thereby achieving internal force redistribution, and finally, greatly improving the bearing capacity of the closed section threaded anchored one-way bolt connection node.

[0051] The above structure can not only meet the one-way bolt tensile connection requirements of general steel structures, but is especially suitable for one-way bolt connections of closed high-strength steel components with small wall thickness but high connection strength requirements, as well as one-way bolt connections of closed components of aluminum alloy structures with soft materials and tapping hardness that cannot meet high-strength connection requirements.

[0052] The present invention does not require special bolt manufacturing processes and installation tools, and avoids the loss of bolt pre-tightening force; compared with traditional bolts, it saves nuts and washers; for thicker connecting plates, it can also reduce the length of the screw, greatly facilitating the construction process and significantly improving the economy.

[0053] Components not described in detail in this embodiment are all existing components that can be purchased through public channels.

[0054] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or substitutions within the technical scope disclosed by the present invention, and these modifications or substitutions should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A plate-attached extended-range deformed thread anchoring one-way bolt connection structure, comprising a screw rod (1), an I-beam (2) and a closed rectangular steel pipe column (4), characterized in that: It also includes a plate (3); the I-beam (2), the plate (3) and the closed rectangular steel pipe column (4) are all provided with mounting holes, the mounting hole on the I-beam (2) is a smooth hole (21), the mounting holes on the plate (3) and the closed rectangular steel pipe column (4) are threaded holes (31), the screw (1) passes through the mounting holes on the I-beam (2), the plate (3) and the closed rectangular steel pipe column (4) in sequence, and is connected to the internal thread of the threaded hole (31) through the surface thread; the internal thread tooth profile of the threaded hole (31) on the plate (3) and the closed rectangular steel pipe column (4) is a multi-step inclined surface.

2. The plate-attached extended-range deformed thread anchored one-way bolt connection structure according to claim 1 is characterized in that: The multi-step bevel is composed of three broken lines forming a cross-sectional edge of the tooth profile, wherein the three broken lines include an acute angle vertex and an obtuse angle vertex, wherein the acute angle vertex is located at the screw-out end side of the screw rod (1), and the obtuse angle vertex is located at the screw-in end side of the screw rod (1).

3. The plate-attached extended-range deformed thread anchored one-way bolt connection structure according to claim 2 is characterized in that: The screw (1) is a standard industrial screw part with a surface thread being a standard thread.

4. The plate-attached extended-range deformed thread anchored one-way bolt connection structure according to claim 3 is characterized in that: The tip of the thread section on the surface of the screw rod (1) is located on the fold line between the acute angle vertex and the obtuse angle vertex of the three-segment fold line section.

5. The plate-attached extended-range deformed thread anchored one-way bolt connection structure according to claim 1 is characterized in that: The plate (3) is fixedly connected to the closed rectangular steel pipe column (4).

6. The plate-attached extended-range deformed thread anchored one-way bolt connection structure according to claim 5 is characterized in that: The internal threads of the threaded holes (31) on the plate (3) and the closed rectangular steel pipe column (4) are formed by processing the connection holes after the plate (3) and the closed rectangular steel pipe column (4) are fixedly connected.

7. The plate-attached extended-range deformed thread anchored one-way bolt connection structure according to claim 5 is characterized in that: The connection method for fixing the plate (3) and the closed rectangular steel pipe column (4) is welding.

8. The plate-attached extended-range deformed thread anchored one-way bolt connection structure according to claim 5 is characterized in that: The patch plate (3) comprises a point patch plate (33) and a large patch plate (34). The point patch plate (33) has one mounting hole; the large patch plate (34) has a plurality of mounting holes for cooperating with the mounting holes at the flange of the I-beam (2).

9. The plate-attached extended-range deformed thread anchored one-way bolt connection structure according to claim 5 is characterized in that: The thickness of the pasting plate (3) is selected according to connection requirements.

10. An assembly method for a plate-attached extended-range deformable thread anchored one-way bolt connection structure according to any one of claims 1 to 9, characterized in that: The following steps are involved: Select the appropriate thickness of the board according to the actual project needs (3); The plate (3) is welded to the corresponding position of the connection hole of the closed rectangular steel pipe column (4), so that the plate (3) and the closed rectangular steel pipe column (4) form a combined anchoring piece; The connection holes on the combined anchoring pieces are tapped to form continuous multi-step inclined internal threads in the connection holes of the plate (3) and the closed rectangular steel pipe column (4); The connection hole of the I-beam (2) is aligned with the connection hole of the combined anchor, and the screw (1) is inserted through the connection hole and tightened.

Images