An expansion sleeve for eliminating the gap between a bolt and a workpiece and a method of using the same

Abstract

The application discloses an expansion sleeve for eliminating the gap between a bolt and a workpiece, and relates to the technical field of bamboo-wood structure of civil engineering. The application comprises an outer sleeve, an inner sleeve and a snap ring; the outer sleeve is a cylindrical structure formed by circumferentially splicing a plurality of arc-shaped plates; wherein the inner sleeve and the outer sleeve have a first position and a second position; the first position is a position corresponding to a concave area of a first wave-shaped concave-convex structure and a convex area of a second wave-shaped concave-convex structure, and the outer sleeve is in a free state; the second position is a position corresponding to a concave area of the first wave-shaped concave-convex structure and a concave area of the second wave-shaped concave-convex structure, and the outer sleeve is in an expansion state. The application can make the outer sleeve radially expand through the axial sliding of the inner sleeve, completely fill the reserved hole, enhance the fastening of the bolt and the workpiece connection, reduce the deformation of the bamboo-wood structure, and increase the beam-column joint stiffness and bearing capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bamboo-wood structure of civil engineering, and more particularly to an expansion sleeve for eliminating the gap between a bolt and a workpiece and a use method thereof. BACKGROUND

[0002] In 2020, China proposed the "double carbon" strategic goal. In order to promote carbon peak and carbon neutral, energy saving and environmental protection has become the main development direction of the construction industry. The construction industry vigorously develops energy-saving and environmentally friendly buildings and comprehensively promotes green and low-carbon building materials. Traditional construction is low in efficiency, high in energy consumption, harmful to nature and polluting to the environment, while bamboo-wood construction is energy-saving and environmentally friendly, convenient for construction and has a beautiful appearance. Therefore, based on the concept of ecological civilization construction and sustainable development in China, the application of bamboo-wood materials in the construction field is gradually increasing, and bamboo-wood construction is loved by people because of its light weight, high strength, good seismic performance, low carbon environmental protection and natural beauty.

[0003] In modern bamboo-wood structures, bolt connections are widely used due to their simple processing and convenient installation. However, the most commonly used steel filler plate bolt connection cannot completely align the holes on the wood structure with the holes on the steel filler plate due to construction deviations. To facilitate construction, a gap of 1-2 mm is often left between the wood hole wall and the screw rod. Under the action of load, the effective force transmission of the connection can only be achieved when the screw rod comes into contact with the wood hole wall after experiencing initial slip. The initial slip of the connection makes its initial stiffness very low and unstable with the change in construction quality. The gap between the bolt and the bolt hole causes the bamboo-wood member and the bolt to slip, and the pressure yield of bamboo-wood material makes the bolt hole further enlarge, resulting in problems such as large deformation and small stiffness of beam-column joints, which affects the stress performance of the joints and limits the popularization and application of bamboo-wood frame structures.

[0004] For reconstituted bamboo frame structures, reconstituted bamboo is a kind of bamboo material that reorganizes bamboo and forms through hot pressing or cold pressing. The cell cavities of bamboo fibers are compacted in advance, and the transverse deformation ability is worse than other bamboo-wood materials. Therefore, the reconstituted bamboo bolt connection beam-column joint is prone to brittle failure, and the bolt is difficult to yield.

[0005] Beam-column joints are important force-bearing parts in structures and an important source of structural stiffness. Therefore, how to solve the problem of small stiffness and large deformation of beam-column joints in bamboo-wood structures to improve the applicability of bamboo-wood structures is a technical problem that needs to be solved by those skilled in the art. SUMMARY

[0006] Therefore, the present application aims to provide an expansion sleeve for eliminating the gap between a bolt and a workpiece to at least partially solve the technical problem of the existing technology that the gap exists in the bolt connection part of the bamboo-wood structure, resulting in small stiffness and easy deformation of the beam-column joint thereof.

[0007] To achieve the above object, the present application adopts the following technical solutions:

[0008] An expansion sleeve for eliminating the gap between a bolt and a workpiece, comprising:

[0009] An outer sleeve, which can be inserted into a reserved hole on the workpiece, is a cylindrical structure formed by circumferentially splicing a plurality of arc-shaped plates; the inner wall surface of the cylindrical structure in the axial direction is formed with a first wavy concave-convex structure;

[0010] A clamping ring, which is sleeved on the outer wall of the outer sleeve, is used to connect the plurality of arc-shaped plates;

[0011] An inner sleeve, the outer wall surface of which in the axial direction is formed with a second wavy concave-convex structure, is coaxially sleeved in the outer sleeve; the rod part of the bolt is threadedly connected with the inner wall of the inner sleeve, and the head part thereof can abut against the end part of the inner sleeve;

[0012] Wherein, the inner sleeve and the outer sleeve have a first position and a second position, the first position is the corresponding position of the concave area of the first wavy concave-convex structure and the convex area of the second wavy concave-convex structure, and the outer sleeve is in a free state; the second position is the corresponding position of the concave area of the first wavy concave-convex structure and the concave area of the second wavy concave-convex structure, and the outer sleeve is in an expanded state.

[0013] The present application can achieve the following beneficial effects: when the expansion sleeve is used, the bolt is screwed inward, the bolt applies an inward axial pressure to the inner sleeve, the convex area of the second wavy concave-convex structure on the inner sleeve slides outward along the side wall of the concave area of the first wavy concave-convex structure on the outer sleeve, the outer sleeve expands radially, until it reaches the second position, the outer sleeve is fully expanded to fill the reserved hole, avoiding the existence of a gap between the bolt and the reserved hole wall, and enhancing the fastening of the connection between the bolt and the workpiece.

[0014] Further, when the inner sleeve and the outer sleeve are in the first position, the end of the inner sleeve close to the bolt head extends to the outside of the outer sleeve; when they are in the second position, the end of the inner sleeve close to the bolt head is flush with the end part of the outer sleeve.

[0015] Further, the first wavy concave-convex structure and the second wavy concave-convex structure are arranged in the same sinusoidal curve shape.

[0016] Further, the outer diameter of the outer sleeve corresponding to the second position is greater than or equal to the hole diameter of the reserved hole.

[0017] Further, the arc-shaped plate is provided with 2-3 pieces.

[0018] Further, the clasp is a ring-shaped sticker, which is attached to the outer sidewall of the outer sleeve to connect the plurality of arc-shaped plates.

[0019] Further, the arc-shaped plates include a first arc-shaped plate, a second arc-shaped plate and a third arc-shaped plate arranged coaxially and connected in sequence, and the first wave-shaped concave-convex structure is arranged on the inner sidewall of the first arc-shaped plate and the third arc-shaped plate.

[0020] Further, the inner sleeve includes a first inner tube segment, a second inner tube segment and a third inner tube segment arranged coaxially and connected in sequence, and the second wave-shaped concave-convex structure is arranged on the outer sidewall of the first inner tube segment and the third inner tube segment.

[0021] A method for using an expansion sleeve for eliminating the gap between a bolt and a workpiece, comprising the following steps:

[0022] Step 1: Assemble the expansion sleeve, surround the inner sleeve outer wall surface with a plurality of arc-shaped plates, and ensure that the first wave-shaped concave-convex structure and the second wave-shaped concave-convex structure are embedded, and attach a ring-shaped sticker to the outer sidewall of the plurality of arc-shaped plates to connect them to form a cylindrical outer sleeve.

[0023] Step 2: Screw the bolt into the assembled expansion sleeve.

[0024] Step 3: Insert the expansion sleeve with the bolt into the reserved hole on the workpiece, tighten the bolt, and the inner sleeve slides axially, and the outer sleeve expands to fill the reserved hole.

[0025] Step 4: Install the nut on the tail of the bolt to complete the fixation.

[0026] According to the above technical solution, compared with the prior art, the present application provides an expansion sleeve for eliminating the gap between a bolt and a workpiece and a method for using the same, which has the following beneficial effects:

[0027] 1. Convenient to use, the expansion sleeve with appropriate specifications is sleeved on the bolt, and then the bolt with the expansion sleeve is inserted into the reserved hole of the workpiece and tightened for use.

[0028] 2. The expansion sleeve has a simple structure, is easy to obtain materials, and has low manufacturing cost.

[0029] 3. By using the expansion sleeve, the material properties of the bamboo and wood workpiece and the bolt can be fully utilized, the gap between the expansion sleeve and the workpiece is eliminated, the sliding between the workpiece and the bolt caused by the pore is avoided, the deformation is reduced, the beam-column joint stiffness and bearing capacity are increased.

[0030] 4. The expansion sleeve of the present application is relatively thin and has a gap, so the stiffness is relatively low, and when the beam-column joint is stressed, deformation and energy dissipation occur, and the ductility of the entire joint is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description only constitute the embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0032] Figure 1 A structural schematic diagram of an expansion sleeve for eliminating the gap between the bolt and the workpiece provided by the present application.

[0033] Figure 2 A structural schematic diagram of an arc-shaped plate provided by the present application.

[0034] Figure 3 A structural schematic diagram of an inner sleeve provided by the present application.

[0035] Figure 4 A structural schematic diagram of a clasp provided by the present application.

[0036] Figure 5 A structural schematic diagram of an expansion sleeve for eliminating the gap between the bolt and the workpiece provided by the present application in an unexpanded state.

[0037] Figure 6 A structural schematic diagram of an expansion sleeve for eliminating the gap between the bolt and the workpiece provided by the present application in an expanded state.

[0038] Figure 7 A structural schematic diagram of the embedded structure of the first wave-shaped concave-convex structure and the second wave-shaped concave-convex structure of an expansion sleeve for eliminating the gap between the bolt and the workpiece provided by the present application.

[0039] Figure 8 A structural schematic diagram of an expansion sleeve for eliminating the gap between the bolt and the workpiece provided by the present application.

[0040] Figure 9 A structural schematic diagram of the use state of an expansion sleeve for eliminating the gap between the bolt and the workpiece provided by the present application.

[0041] Figure 10 A structural schematic diagram of the use state of an expansion sleeve for eliminating the gap between the bolt and the workpiece provided by the present application.

[0042] Figure 11 A sectional structural schematic diagram of the use state of an expansion sleeve for eliminating the gap between the bolt and the workpiece provided by the present application.

[0043] Fig.:

[0044] 1, bamboo component, 20, steel piece, 30, expansion sleeve, 40, bolt, 50, nut;

[0045] 1, outer sleeve, 101, first wave-shaped concave-convex structure, 2, inner sleeve, 201, second wave-shaped concave-convex structure, 3, snap ring; 111, first arc-shaped plate, 112, second arc-shaped plate, 113, third arc-shaped plate, 21, first inner tube section, 22, second inner tube section, 23, third inner tube section. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0047] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0048] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] Example 1:

[0050] Please refer to Figures 1-7 The present embodiment provides an expansion sleeve 30 for eliminating the gap between the bolt and the workpiece on the bamboo component, comprising:

[0051] The outer sleeve 1 can be inserted into the reserved hole on the workpiece, and the outer sleeve 1 is a cylindrical structure formed by circumferentially splicing a plurality of arc-shaped plates 11; the inner wall surface of the cylindrical structure is formed with a first wave-shaped concave-convex structure 101;

[0052] The clasp 3 is sleeved on the outer wall of the outer sleeve 1 to connect the plurality of arc-shaped plates 11;

[0053] The inner sleeve 2 is coaxially sleeved in the outer sleeve 1, and the outer wall surface of the inner sleeve 2 in the axial direction is formed with a second wave-shaped concave-convex structure 201. The rod of the bolt is threadedly connected with the inner wall of the inner sleeve 2, and the head of the bolt can abut against the end of the inner sleeve 2.

[0054] The first wave-shaped concave-convex structure 101 and the second wave-shaped concave-convex structure 201 are arranged in the same sinusoidal shape.

[0055] When the expansion sleeve 30 is used, the bolt 40 is screwed inward, the bolt 40 applies axial pressure to the inner sleeve 2, the convex regions of the second wave-shaped concave-convex structure 201 on the inner sleeve 2 slide outward along the side walls of the concave regions of the first wave-shaped concave-convex structure 101 on the outer sleeve 1, the outer sleeve 1 expands radially, until the second position is reached, the outer sleeve 1 is fully expanded to fill the reserved hole, avoiding the existence of a gap between the bolt 40 and the hole wall of the reserved hole, and enhancing the fastening of the bolt 40 and the workpiece.

[0056] Preferably, when the inner sleeve 2 and the outer sleeve 1 are in the first position, the end of the inner sleeve 2 close to the bolt head extends to the outside of the outer sleeve 1; when in the second position, the end of the inner sleeve 2 close to the bolt head is flush with the end of the outer sleeve 1. This facilitates observation of whether the outer sleeve 1 is fully expanded, and prevents the inner sleeve 2 and the outer sleeve 1 from being in an unstable state due to incomplete expansion.

[0057] Preferably, the first wave-shaped concave-convex structure 101 and the second wave-shaped concave-convex structure 201 are arranged in the same sinusoidal shape. It should be noted that the sinusoidal shape referred to here does not mean that the first wave-shaped concave-convex structure 101 and the second wave-shaped concave-convex structure 201 are arranged in a completely sinusoidal shape, but rather that they have a generally sinusoidal configuration, and the sizes of the first wave-shaped concave-convex structure 101 and the second wave-shaped concave-convex structure 201 are the same, so that the inner sleeve 2 can slide smoothly in the outer sleeve 1, and the shape and size of the convex regions will not hinder the sliding of the inner sleeve 2.

[0058] The outer diameter of the outer sleeve 1 corresponding to the second position is greater than or equal to the hole diameter of the reserved hole. Since the first wave-shaped concave-convex structure 101 and the second wave-shaped concave-convex structure 201 have the same shape and size, the height H of the convex part is greater than or equal to 1 / 4 of the difference between the hole diameter of the reserved hole and the outer diameter of the outer sleeve 1 corresponding to the first position, so that the outer diameter of the outer sleeve 1 in the expanded state is greater than or equal to the hole diameter of the reserved hole, thereby preventing a gap between the expansion sleeve 30 and the reserved hole of the workpiece.

[0059] The arc-shaped plates 11 are generally 2-3 pieces, but the specific number, size, material, and use scenario are related, and can be adjusted according to different situations, and are not limited to 2-3 pieces.

[0060] The snap ring 3 is a ring-shaped sticker, which is attached to the outer side walls of the plurality of arc-shaped plates 11 to connect the plurality of arc-shaped plates 11. The selection of the sticker is based on the basic requirement that the arc-shaped plates 11 connected by the sticker will not be damaged under non-extreme conditions such as transportation, storage, and taking, so as to cause the inner sleeve 2 and the outer sleeve 1 to separate from each other. Embodiment 2:

[0061] In this scenario where the bamboo-wood component 10 is connected to the steel piece 20, the steel piece 20 has poor ductility and high strength, and the outer diameter of the expansion sleeve 30 increases after being fully expanded, and the outer diameter of the outer sleeve 1 may exceed the hole diameter of the reserved hole. The steel piece 20 is limited by the reserved hole, and after the expansion sleeve 30 is expanded to contact the inner wall of the reserved hole, it cannot continue to expand, thereby causing the screwing of the bolt 40 to be laborious, and in severe cases, the expansion sleeve 30 may be damaged. Therefore, the design of the expansion sleeve 30 also needs to consider the problem of different expansion sizes caused by the different strengths of steel and bamboo-wood materials.

[0062] Referring to Figures 8-11 , the embodiment improves the embodiment 1 and provides an expansion sleeve 30 that can be applied to the connection between the bamboo-wood component 10 and the steel piece 20. The arc-shaped plates 11 include the first arc-shaped plate 111, the second arc-shaped plate 112, and the third arc-shaped plate 113 arranged coaxially and connected in sequence, and the first wave-shaped concave-convex structure 101 is arranged on the inner side walls of the first arc-shaped plate 111 and the third arc-shaped plate 113.

[0063] Preferably, the first arc-shaped plate 111, the second arc-shaped plate 112, and the third arc-shaped plate 113 are integrally connected and formed.

[0064] Preferably, the inner sleeve 2 includes the first inner tube section 21, the second inner tube section 22, and the third inner tube section 23 arranged coaxially and connected in sequence, and the second wave-shaped concave-convex structure 201 is arranged on the outer side walls of the first inner tube section 21 and the third inner tube section 23.

[0065] Preferably, the first inner tube segment 21, the second inner tube segment 22 and the third inner tube segment 23 are integrally connected and formed.

[0066] By reducing the concave-convex structure at the corresponding position of the steel piece 20, the expansion sleeve 30 at the steel member is prevented from continuing to expand. Thus, when the sleeve expands to the outer wall contacting the inner wall of the reserved hole, the second arc-shaped plate limited by the steel piece 20 and the second inner sleeve part will not continue to expand, because the reserved hole of the steel piece 20 limits the expansion. Thus, the stress of each part of the sleeve corresponding to the workpiece can be in a suitable state, and the situation that the bolt 40 is too laborious to be screwed is avoided.

[0067] Reference Figures 9-11 The application also provides a method for using the expansion sleeve for eliminating the gap between the bolt and the workpiece, comprising the following steps:

[0068] Step 1: Assemble the expansion sleeve 30, surround the outer wall surface of the inner sleeve 2 with a plurality of arc-shaped plates 11, and ensure that the first wave-shaped concave-convex structure 101 and the second wave-shaped concave-convex structure 201 are embedded, and connect the plurality of arc-shaped plates 11 to form the outer sleeve 1 in a cylindrical shape by pasting the annular adhesive tape on the outer side wall of the plurality of arc-shaped plates 11;

[0069] Step 2: Screw the bolt 40 into the assembled expansion sleeve 30, and make the head of the bolt 40 contact the end of the inner sleeve;

[0070] Step 3: Insert the expansion sleeve 30 with the bolt 40 into the reserved hole on the workpiece, and tighten the bolt 40. During the screwing process, the inner sleeve 2 is axially slid by the bolt 40, at this time, the convex region of the second wave-shaped concave-convex structure 201 on the inner sleeve 2 slides outward from the concave region of the first wave-shaped concave-convex structure 101, the outer sleeve 1 expands radially, until the head of the bolt 40 contacts the end of the outer sleeve 1, the concave region of the first wave-shaped concave-convex structure 101 corresponds to the concave region of the second wave-shaped concave-convex structure 201, and the outer sleeve 1 is fully expanded to fill the reserved hole;

[0071] Step 4: Install the nut 50 at the tail of the bolt 40, and complete the fixation.

[0072] Production requirements of the application:

[0073] Production of the inner sleeve 2: small batches can be manufactured by pipe turning process. Large batches can be manufactured by rolling the plate with a suitable cross section from the metal material such as steel according to the use scene, and then bending the plate into a tubular shape.

[0074] Production of the arc-shaped plate 11: small batch production, if brittle material, adopt CNC machining; if non-brittle material, adopt CNC machining to produce strip material, then cut into small pieces, then stamping forming. Large batch production adopts different production process according to different materials, brittle material adopts powder metallurgy, casting mode production; good ductility material adopts stretching profile or hot rolling process to make profile, then cut, then stamping forming.

[0075] Overall assembly: through automatic equipment, wrap the appropriate number of arc-shaped plates 11 outside the inner sleeve 2, then paste the paper to prevent scattering.

[0076] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between various embodiments can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0077] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An expansion sleeve for eliminating the gap between a bolt and a workpiece, characterized in that, The utility model relates to a kind of expansion sleeve for eliminating the gap between bolt and workpiece, comprising: Outer sleeve (1), the outer sleeve (1) is inserted in the reserved hole on the workpiece, the outer sleeve (1) is the cylindrical structure formed by the circumferential splicing of multiple arc plates (11);The inner wall surface of the cylindrical structure is formed with first wave-shaped concave-convex structure (101); Snap ring (3), the snap ring (3) is sleeved on the outer wall of the outer sleeve (1) to connect multiple arc plates (11); Inner sleeve (2), the outer wall surface of the inner sleeve (2) is formed with second wave-shaped concave-convex structure (201), the inner sleeve (2) is coaxially sleeved in the outer sleeve (1);The rod portion of the bolt is threadedly connected with the inner wall of the inner sleeve (2), and the head portion is abutted with the end portion of the inner sleeve (2); Wherein, the inner sleeve (2) and the outer sleeve (1) have first position and second position, the first position is the corresponding position of the concave area of the first wave-shaped concave-convex structure (101) and the convex area of second wave-shaped concave-convex structure (201), and the outer sleeve (1) is in free state;The second position is the corresponding position of the concave area of the first wave-shaped concave-convex structure (101) and the concave area of second wave-shaped concave-convex structure (201), and the outer sleeve (1) is in expanded state.

2. An expansion sleeve for eliminating the gap between a bolt and a workpiece according to claim 1, characterized in that, When the inner sleeve (2) and the outer sleeve (1) are in the first position, the end of the inner sleeve (2) close to the bolt head extends to the outside of the outer sleeve (1);When in the second position, the end of the inner sleeve (2) close to the bolt head is flush with the end portion of the outer sleeve (1).

3. An expansion sleeve for eliminating the gap between a bolt and a workpiece according to claim 1, characterized in that, The first wave-shaped concave-convex structure (101) and the second wave-shaped concave-convex structure (201) are arranged in the same sinusoidal curve shape.

4. An expansion sleeve for eliminating the gap between a bolt and a workpiece according to claim 3, characterized in that, The outer diameter of the outer sleeve (1) corresponding to the second position is greater than or equal to the hole diameter of the reserved hole.

5. An expansion sleeve for eliminating the gap between a bolt and a workpiece according to claim 1, wherein The arc plate (11) is provided with 2-3 pieces.

6. An expansion sleeve for eliminating the gap between a bolt and a workpiece according to claim 1, characterized in that, The snap ring (3) is a ring-shaped sticker, which is pasted on the outer side wall of the outer sleeve (1) to connect the multiple arc plates (11).

7. An expansion sleeve for eliminating the gap between a bolt and a workpiece according to any one of claims 1-6, characterized in that, The arc plate (11) includes the first arc plate (111), the second arc plate (112) and the third arc plate (113) arranged coaxially and connected in sequence, and the first wave-shaped concave-convex structure (101) is arranged on the inner side wall of the first arc plate (111) and the third arc plate (113).

8. An expansion sleeve for eliminating the gap between a bolt and a workpiece according to claim 7, characterized in that, The inner sleeve (2) includes the first inner tube section (21), the second inner tube section (22) and the third inner tube section (23) arranged coaxially and connected in sequence, and the second wave-shaped concave-convex structure (201) is arranged on the outer side wall of the first inner tube section (21) and the third inner tube section (23). 9.A method for using the expansion sleeve for eliminating the gap between bolt and workpiece according to any one of claims 6-8, comprising the following steps: Step 1: assemble the expansion sleeve, surround the outer wall surface of the inner sleeve with multiple arc plates, and ensure that the first wave-shaped concave-convex structure and the second wave-shaped concave-convex structure are embedded, paste a ring-shaped sticker on the outer side wall of the multiple arc plates to connect them to form a cylindrical outer sleeve; Step 2: screw the bolt into the assembled expansion sleeve. Step 3: insert the bolted expansion sleeve into the reserved hole on the workpiece, tighten the bolt, the bolt drives the inner sleeve to slide axially, and the outer sleeve expands to fill the reserved hole; Step 4: install the nut on the tail of the bolt, and complete the fixation.

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