Sleeve type unilateral bolt fastener

Abstract

The utility model provides a sleeve type unilateral bolt fastener which comprises a screw rod and a sleeve, an internal thread matched with the screw rod is arranged in the sleeve, a sleeve fixing mechanism is installed on the sleeve, an elastic anti-shearing structure is arranged at the stretching-in end of the screw rod, and the elastic anti-shearing structure is connected with the screw rod. The sleeve fixing mechanism comprises at least two clamping blocks evenly distributed along the circumference of the outer wall of the sleeve, sliding connection openings are formed in the positions, corresponding to the clamping blocks, of the outer wall of the sleeve, the clamping blocks are connected into the sliding connection openings in a sliding mode, and clamping grooves are formed in the positions, corresponding to the clamping blocks, of the inner side of a steel plate of the to-be-installed unilateral bolt fastener. The concrete-filled steel tube joint is reasonable in design, construction efficiency is greatly improved in a single-side tightening mode, meanwhile, the stretching-in type screw and concrete in the concrete-filled steel tube joint work in a combined mode to form a shear force piece, the shear resistance of the fastening piece is improved, the connection mode of a beam column joint area is optimized, the number of arranged bolts is reduced, and the construction cost is reduced. The connecting structure has the characteristics of convenient and fast installation, firm connection, high shear bearing capacity and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to a sleeve type single-side bolt fastener. BACKGROUND

[0002] With the high-speed development of China's economy, China's infrastructure construction also develops rapidly, and steel pipe concrete is widely used in some high-rise buildings and large-span bridges due to its high bearing capacity, good plastic toughness, superior seismic performance and convenient construction and the like. Limited by the column size and construction conditions of the steel pipe concrete composite structure, the connection between the steel pipe concrete beam column nodes is relatively complex. How to realize reliable connection between the steel pipe concrete beam column nodes is particularly important.

[0003] The existing connection methods of the steel pipe concrete beam column node mainly include welding and bolt connection. Among them, the welding connection is the most common, but it is easily affected by external factors such as welding environment, welding technology and welding residual stress. Compared with the welding connection, the bolt connection has advantages in construction quality, speed and cost, and the node adopting the bolt connection can be standardized and modularized, which meets the development trend of green assembly building.

[0004] However, the traditional bolt connection needs to be held and fixed on both sides of the connection surface for installation, which is complicated and low in efficiency. Due to the small size of the steel pipe concrete, it is difficult to fix the bolt of the beam column node, and a single-side tightening type fastening bolt needs to be used. The most widely used single-side bolt is an ordinary expansion bolt, which has the defects of difficult application of bolt pre-tightening force and poor fastening effect, and its structure is complex, special installation tools are needed, and the installation steps are complicated, especially it cannot be repeatedly loosened and tightened, so the construction efficiency is low. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides a sleeve type single-side bolt fastener, which greatly improves the construction efficiency by means of single-side tightening, and utilizes the extension type screw rod and the internal concrete of the steel pipe concrete node to work together to form a shear member, thereby improving the shear resistance of the fastener, optimizing the connection form of the beam column node area and reducing the number of bolt arrangement, and having the characteristics of convenient and fast installation, firm connection, high shear bearing capacity and the like.

[0006] The utility model adopts the following scheme: a sleeve type single-side bolt fastener: including screw rod, sleeve, the inner thread that sets up with screw rod in the sleeve, the sleeve fixed mechanism is installed on the sleeve, the extension end of screw rod is provided with elastic shear structure.

[0007] Further, the sleeve fixing mechanism comprises at least two clamping blocks, the sleeve outer wall is provided with a sliding interface corresponding to the clamping blocks, the clamping blocks are slidably arranged in the sliding interface, and the inner side of the steel plate to be installed with the single-side bolt fastener is provided with a clamping groove corresponding to the clamping blocks.

[0008] Further, the length of the clamping block is greater than the wall thickness of the sleeve.

[0009] Further, the sleeve segment not extending into the steel plate to be installed with the single-side bolt fastener is provided with an external thread.

[0010] Further, the screw rod comprises a threaded rod segment, one end of the threaded rod segment is provided with a screw head, the other end is provided with a light shaft rod segment, and the elastic shear-resistant structure is arranged on the outer periphery of the end of the light shaft rod segment.

[0011] Further, the outer wall of the light shaft rod segment is provided with a plurality of internal notches.

[0012] Further, the elastic shear-resistant structure comprises a plurality of elastic sheets distributed along the outer periphery of the screw rod end, and the outer periphery of the screw rod end is provided with a containing groove corresponding to the elastic sheets.

[0013] Further, the elastic sheet comprises a triangular slide sheet, the triangular slide sheet is slidably arranged in the containing groove along the radial direction of the screw rod, and a spring for driving the triangular slide sheet to pop out is arranged in the containing groove.

[0014] Further, the triangular slide sheet is a right-angled triangle, the right-angled end of the triangular slide sheet is outward, and the hypotenuse is parallel to the axial direction of the screw rod, and the two ends of the spring are connected to the groove bottom of the containing groove and the hypotenuse of the triangular slide sheet respectively.

[0015] Further, a nut is further arranged, and the nut is provided with an internal thread matched with the external thread of the sleeve.

[0016] Compared with the prior art, the utility model has the advantages of reasonable design, greatly improved construction efficiency through the single-side tightening mode, improved shear resistance of the fastener by utilizing the extended screw rod and the concrete in the concrete-filled steel tube joint to form a shear member, optimized connection form of the beam-column joint area and reduced number of bolt arrangement, convenient and fast installation, firm connection, high shear bearing capacity and the like. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an embodiment structure schematic view of the utility model.

[0018] Figure 2 It is an embodiment structure schematic view of the utility model (remove the nut).

[0019] Figure 3The sleeve structure schematic diagram of the embodiment of the utility model;

[0020] Figure 4 The clamping block structure schematic diagram of the embodiment of the utility model;

[0021] Figure 5 The clamping groove structure schematic diagram of the embodiment of the utility model;

[0022] Figure 6 The screw structure schematic diagram of the embodiment of the utility model;

[0023] Figure 7 The elastic shear resistance structure schematic diagram of the embodiment of the utility model.

[0024] In the drawing: 1-screw; 2-sleeve; 3-internal thread; 4-sleeve fixing mechanism; 5-elastic shear resistance structure; 6-steel plate to be installed with single-side bolt fastener; 7-workpiece plate; 8-clamping block; 9-sliding interface; 10-clamping groove; 11-external thread; 12-nut; 13-threaded rod section; 14-screw head; 15-optical axis rod section; 16-receiving groove; 17-triangular sliding sheet; 18-spring; 19-internal score; 20-bolt hole. DETAILED DESCRIPTION

[0025] The utility model will be further explained below in combination with the drawings and embodiments.

[0026] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0027] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and in addition, it should be understood that when the terms "comprise" and / or "include" are used in the specification, it means that the features, steps, operations, devices, components and / or their combinations are present.

[0028] As Figures 1-7As shown, a sleeve type single-side bolt fastener: including a screw rod 1, a sleeve 2, the sleeve is provided with an internal thread 3 matched with the screw rod, the sleeve is provided with a sleeve fixing mechanism 4, the protruding end of the screw rod is provided with an elastic shear structure 5; In use, the steel plate 6 to be installed with the single-side bolt fastener and the workpiece plate 7 to be installed are respectively provided with a mounting hole A and a mounting hole B corresponding to the sleeve, the mounting hole A and the mounting hole B are correspondingly communicated, the sleeve is fixed in the combined channel formed by the mounting hole A and the mounting hole B, and then the screw rod is screwed in, and the protruding section of the screw rod, the elastic shear structure and the subsequent concrete combination work form a shear member, thereby improving the shear performance of the overall fastener.

[0029] In this embodiment, in order to realize the fixation of the sleeve, the sleeve fixing mechanism includes at least two clamping blocks 8 distributed along the circumference of the outer wall of the sleeve, the outer wall of the sleeve is provided with a sliding interface 9 corresponding to the clamping block, the clamping block is slid into the sliding interface, and the inner side of the steel plate to be installed with the single-side bolt fastener is provided with a clamping groove 10 corresponding to the clamping block, that is, the clamping block is slid into the clamping groove from the sliding interface, thereby realizing the rapid connection of the sleeve and the inner side of the steel plate. Specifically, the length of the clamping block is greater than the wall thickness of the sleeve, and the length of the clamping block is greater than the groove body of the clamping groove, that is, before use, the clamping block will be retracted into the sliding interface, and the inner end of the clamping block will protrude into the sleeve, when the screw rod protrudes into the sleeve, the outer wall of the screw rod will push out the clamping block, so that part of the clamping block protrudes into the clamping groove, and the remaining part stays in the sliding interface, thereby realizing the connection of the sleeve and the inner side of the steel plate to be installed with the single-side bolt fastener. Of course, the inner end of the clamping block can be provided with an arc-shaped end, which facilitates the screw rod to be pushed out, and the sleeve with an internal thread is installed, thereby realizing the single-side tightening of the screw rod.

[0030] In this embodiment, the sleeve section of the sleeve not protruding into the steel plate to be installed with the single-side bolt fastener is provided with an external thread 11, and the device further includes a nut 12, which can be an internal hexagonal end for easy rotation. The nut is provided with an internal thread matched with the external thread on the sleeve, that is, after the screw rod is screwed into the sleeve, the sleeve opening is closed by the nut. Since the sleeve is exposed to external conditions, the nut can prevent the occurrence of cracks due to the erosion of water and other impurities accumulated at the connection between the sleeve and the steel pipe surface, thereby affecting the working state of the entire bolt and improving the corrosion resistance of the overall structure.

[0031] In this embodiment, in order to design reasonably, the screw rod includes a threaded rod section 13, one end of the threaded rod section is provided with a screw head 14, which can be an internal hexagonal screw head, and the diameter of the screw head should be smaller than the outer diameter of the sleeve and should not interfere with the nut, and the other end is provided with a light shaft rod section 15, and the elastic shear structure is arranged on the outer periphery of the end of the light shaft rod section.

[0032] In the embodiment, the elastic shear structure comprises a plurality of elastic sheets distributed along the outer periphery of the screw end, the outer periphery of the screw end is provided with a receiving groove 16 corresponding to the elastic sheet, the elastic sheet comprises a triangular slide 17 which is slid along the radial direction of the screw and is received in the receiving groove, and a spring 18 is arranged in the receiving groove for driving the triangular slide to pop out. Specifically, the triangular slide is a right-angled triangle, the right-angled end of the triangular slide is outward, and the hypotenuse is parallel to the axial direction of the screw. The two ends of the spring are connected to the groove bottom of the receiving groove and the hypotenuse of the triangular slide respectively. In use, the triangular slide is in the outward state in the natural state due to the action of the spring. When the screw is inserted into the sleeve, the triangular slide is pressed by the sleeve, and the spring is pressed, so that the triangular slide is retracted into the receiving groove. After passing through the sleeve, the triangular slide is extruded by the spring to return to the outward state. Then, the inside of the steel plate is filled with concrete which can be filled into the spring to make the triangular slide and the screw bear force together, thereby increasing the shear resistance of the bolt fastener.

[0033] In the embodiment, in order to further improve the shear resistance of the screw, a plurality of inner notches 19 are arranged on the outer wall of the optical axis rod segment. After the inside of the steel pipe is filled with concrete, the inner notches can be fully engaged to further improve the shear resistance of the screw, thereby increasing the shear resistance of the bolt fastener. The inner notches can be inner grooves or other opening structures which are concave inwardly to the center of the screw, so as to facilitate full engagement. The elastic shear structure and the inner notches are combined with the concrete to further improve the shear resistance of the screw.

[0034] In the embodiment, the specific installation method is as follows. First, the sleeve is inserted into the bolt hole 20 of the reserved steel pipe concrete beam column joint. Then, the screw is screwed into the sleeve, and the clamping piece arranged in the sleeve is pushed out to the clamping groove of the steel plate on the inside of the bolt hole. After the sleeve is fixed, the screw is tightened. When the screw is tightened and inserted into the sleeve, the triangular slide at the tail of the screw is pressed by the inner wall of the sleeve. After the screw is screwed out of the sleeve, the spring is in the natural state, and the triangular slide is extruded. Then, the screw is tightened, and finally the sleeve on the outside is sleeved with a nut to realize unilateral fastening of the bolt. Thus, the installation steps of the bolt fastener are completed. After the bolt fastener is installed, the inside of the steel plate is filled with concrete, so that the inserted screw and the concrete in the steel pipe concrete joint work together to form a shear member, thereby improving the shear resistance of the fastener.

[0035] Any of the above technical solutions of the utility model discloses, if it discloses numerical range except declaration, then the numerical range disclosed is preferred numerical range, and any person skilled in the art should understand that: preferred numerical range is only the numerical value that the technical effect is obvious or representative in many implementable numerical values. Because the numerical value is more, cannot be exhausted, so the utility model discloses part of numerical value to illustrate the technical scheme of the utility model, and the numerical value enumerated above should not constitute the restriction of the protection scope of the utility model.

[0036] If the words such as "first", "second" are used to limit the components in the present application, those skilled in the art should know that: the use of "first", "second" is only for the convenience of distinguishing the components, and the above words have no special meaning unless otherwise stated.

[0037] If the utility model discloses or involves mutually fixed connecting components or structural members, except for declaration, the fixed connection can be understood as: detachable fixed connection (for example, bolt or screw connection), and can also be understood as: non-detachable fixed connection (for example, riveting, welding), of course, the mutual fixed connection can also be replaced by an integral structure (for example, integrally formed by using casting process) (except for obviously adopting integral forming process).

[0038] In addition, the position relationship such as "vertical", "horizontal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in any of the above technical solutions of the utility model for indicating the orientation or position relationship is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the patent, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation of the patent, and the shape-related terms used in any of the above technical solutions of the utility model include shapes similar, similar or close to the shape unless otherwise stated.

[0039] Any component provided by the utility model can be assembled from multiple individual components, or can be a single component manufactured by integral forming process.

[0040] It should be noted that the above examples are used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical solutions of the present application, they should be covered in the technical solution range claimed by the present application.

Claims

1. A telescopic single-sided bolt fastener, characterized by: The device comprises a screw rod and a sleeve, the sleeve is provided with an internal thread matched with the screw rod, a sleeve fixing mechanism is installed on the sleeve, and an elastic shear-resistant structure is arranged on the extending end of the screw rod.

2. The telescopic single-sided bolted fastener of claim 1, wherein: The sleeve fixing mechanism comprises at least two clamping blocks, the sleeve outer wall is provided with a sliding interface corresponding to the clamping blocks, the clamping blocks are slidably arranged in the sliding interfaces, and a clamping groove is arranged on the inner side of the steel plate to be installed with the single-side bolt fastener and corresponding to the clamping blocks.

3. The telescopic single-sided bolted fastener of claim 2, wherein: The length of the clamping block is greater than the wall thickness of the sleeve.

4. The telescopic single-sided bolt fastener of claim 2, wherein: An external thread is arranged on the sleeve segment outside the steel plate to be installed with the single-side bolt fastener.

5. The telescopic single-sided bolt fastener of claim 1, wherein: The screw rod comprises a threaded rod segment, one end of the threaded rod segment is provided with a screw head, the other end is provided with a light shaft rod segment, and the elastic shear-resistant structure is arranged on the outer periphery of the end of the light shaft rod segment.

6. The telescopic single-sided bolted fastener of claim 5, wherein: A plurality of internal notches are arranged on the outer wall of the light shaft rod segment.

7. The telescopic single-sided bolt fastener of claim 5, wherein: The elastic shear-resistant structure comprises a plurality of elastic pieces distributed along the outer periphery of the screw rod, and the outer periphery of the screw rod is provided with a containing groove corresponding to the elastic pieces.

8. The telescopic single-sided bolted fastener of claim 7, wherein: The elastic piece comprises a triangular slide piece, the triangular slide piece is slidably arranged in the containing groove along the radial direction of the screw rod, and a spring for driving the triangular slide piece to pop out is installed in the containing groove.

9. The telescopic single-sided bolted fastener of claim 8, wherein: The triangular slide piece is a right-angled triangle, the right-angled end of the triangular slide piece is outward, and the hypotenuse is parallel to the axial direction of the screw rod, and the two ends of the spring are respectively connected to the groove bottom of the containing groove and the hypotenuse of the triangular slide piece.

10. The telescopic single-sided bolt fastener of claim 4, wherein: A screw cap is further provided, and the screw cap is provided with an internal thread matched with the external thread on the sleeve.

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