CN114517528B

CN114517528B - Expansion type raw bamboo structure connecting device and preparation method thereof

Info

Publication number: CN114517528B
Application number: CN202111493166.8A
Authority: CN
Inventors: 闫有喜; 张效忠; 张继红; 杨连杰
Original assignee: Yibin University
Current assignee: Yibin University
Priority date: 2021-12-08
Filing date: 2021-12-08
Publication date: 2022-10-04
Anticipated expiration: 2041-12-08
Also published as: CN114517528A

Abstract

The invention discloses an expansion type raw bamboo structure connecting device and a preparation method thereof, wherein the expansion type raw bamboo structure connecting device comprises an outer sleeve, an inner sleeve, an expansion core and bamboo wedges; one end of the inner sleeve is provided with an expansion end, the expansion core penetrates through the expansion end of the inner sleeve and is clamped in the inner sleeve, and the expansion end of the inner sleeve is arranged in the outer sleeve; the bamboo-wood wedge is arranged in a gap between the expansion end and the expansion core, and the bamboo-wood wedge is tightly contacted with the expansion end along with the increase of the depth of the expansion end of the inner sleeve embedded into the outer sleeve, so that the expansion end of the inner sleeve is forced to be tightly contacted with the inner wall of the outer sleeve; the invention fully utilizes the advantage of green and renewable bamboo wood, and does not add other high-energy-consumption materials which influence sustainable development; the method for overcoming the influence of the holes on the raw material on the stress performance is adopted; the problems of uneven bonding and serious damage to the connection strength caused by poor fit between the inner wall and the outer wall of the original bamboo sleeve are solved; the original bamboo is not processed in an ideal way, and the problems of high processing cost, low efficiency, time consumption and the like are solved.

Description

Expansion type raw bamboo structure connecting device and preparation method thereof

Technical Field

The invention relates to the technical field of raw bamboo structure fixing, in particular to an expansion type raw bamboo structure connecting device and a preparation method thereof.

Background

Bamboo is a perennial lignified plant, having an overground stem (bamboo stalk) and an underground stem (bamboo rhizome). The bamboo rod is usually cylindrical and is formed by connecting nodes, the nodes are usually hollow, and the nodes are formed by sheath rings and rod rings.

The bamboo material has the characteristics of high strength, good toughness, good plasticity, small density and the like, and is superior to common materials such as wood, steel, concrete and the like in the aspects of tensile property, compression resistance, bending resistance and the like due to unique internal structure. Meanwhile, the bamboo wood is a renewable resource, and the energy consumption for production and construction is low, and the environmental pollution is small, so that the bamboo wood can be widely applied to the building and civil engineering.

In the application of building and civil engineering, the raw bamboo needs to be plastically processed, the connection between the raw bamboo structures in the processing process becomes a technical difficulty, the connected structure system has no stress performance and appearance representation like the raw bamboo system, and the common connection modes include the following types:

(1) Binding: the binding is the most original and basic structural joint connection mode of the original bamboo building. In the node structure, the connecting piece is a palm rope or an iron wire, the connected piece is a raw bamboo, and the basic stress principle is that the friction force at the node is utilized to resist various external forces. However, there are problems in that the structural strength is low and the connector coir rope is generally exposed to the external environment, easily causing corrosion, falling off, etc.

(2) Binding and joggling: the method for manufacturing the original bamboo building structural node by combining binding and joggling is an improvement on a pure binding node, and the structural principle mainly comes from simulation and inheritance of a wood structure mortise-tenon joint, as shown in figure 1. Different from the common tenon-and-mortise joints of wood structures, the single components are inserted and fixed with each other due to the characteristics of the original bamboo material and the processing difficulty, so that the firmness of the joints cannot be ensured, the joints are reinforced and fixed by auxiliary fixing parts such as bamboo nails and wood wedges and binding parts such as palm ropes or iron wires, and the overall stress appearance image of the bamboo is influenced;

(3) Wear set formula connected node: the method is mainly used for connecting two raw bamboos with one large diameter and one small diameter in a penetrating and sleeving manner, and basically comprises the steps of punching a hole in the large raw bamboo according with the size of the raw bamboo, connecting the two raw bamboos by using bamboo nails and glue, and fixing the two raw bamboos as shown in figure 2. The main problems of the method are that the integrity of the bamboo body is damaged by punching bamboo holes, the glue is easy to lose efficacy, and the connection strength is low;

(4) Prefabricating metal pieces and raw bamboo: the method is a method for constructing the structural node of the original bamboo building by using a prefabricated metal piece as a connecting piece. The raw bamboo is usually fixed by metal hoops, and two pieces of bamboo are connected by welding or bolts by prefabricated metal connectors, as shown in fig. 3. The connection mode has the problems that the metal component is exposed outside and is easy to rust, and meanwhile, the mismatching of the two materials can cause great pressure to damage the original bamboo stalks to a certain extent. The appearance of the raw bamboo is also influenced to a certain extent;

(5) Prefabricating metal pieces, concrete and raw bamboo: the original bamboo wood is fixed by metal parts, and then the prefabricated metal parts are pre-embedded in concrete, as shown in figure 4. The problem of the connection mode is the same as that of the connection mode (4);

(6) Use simple and easy metal connecting piece: the method is characterized in that bolts are directly used, and the specific method comprises the steps of respectively punching holes according with the diameter size of a screw at the joint of two original bamboos to be connected and then connecting the holes by using a screw, as shown in figure 5. The connection mode is to punch holes on the raw material, the stress performance of the raw bamboo material is seriously influenced, meanwhile, metal components are easy to rust, and the torque resistance of the connecting piece is poor.

Disclosure of Invention

The invention aims to: aiming at the problems, the expansion type original bamboo structure connecting device and the preparation method thereof are provided, the advantage of green and renewable bamboo materials is completely utilized, and other high-energy-consumption materials which influence sustainable development are not added; the method for overcoming the influence of the holes on the raw material on the stress performance is adopted; the problems of uneven bonding and serious damage to the connection strength caused by poor fit between the inner wall and the outer wall of the original bamboo sleeve are solved; the original bamboo is not processed in an ideal way, and the problems of high processing cost, low efficiency, time consumption and the like are solved.

The invention is realized by the following scheme:

an expansion type raw bamboo structure connecting device comprises an outer sleeve, an inner sleeve, an expansion core and bamboo wedges; one end of the inner sleeve is provided with an expansion end, the expansion core penetrates through the expansion end of the inner sleeve and is clamped in the inner sleeve, and the expansion end of the inner sleeve is arranged in the outer sleeve; the bamboo-wood wedge is arranged in a gap between the expansion end and the expansion core, and the bamboo-wood wedge is tightly contacted with the expansion end along with the increase of the depth of the expansion end of the inner sleeve embedded into the outer sleeve, so that the expansion end of the inner sleeve is forced to be tightly contacted with the inner wall of the outer sleeve.

Based on above-mentioned former bamboo structure connecting device of inflation formula structure, the outer sleeve is provided with the bamboo splint reinforced layer, glues bamboo splint reinforced layer and outer sleeve fixed connection through the structure.

Based on the structure of the expansion type raw bamboo structure connecting device, the inner sleeve comprises an expansion end, a connecting end, a first rod ring and an outer end part; the expansion ends are a plurality of equally divided splitting ends with the same length; the connecting end is connected with the expansion end, and the first rod ring is arranged between the connecting end and the outer end.

Based on the structure of the expansion type original bamboo structure connecting device, the outer diameter of the inner sleeve is smaller than the inner diameter of the outer sleeve, and the equal splitting ends are 5-10 equal splitting.

Based on the structure of the expansion type raw bamboo structure connecting device, the expansion core comprises a conical part and a cylindrical part, and the conical part and the cylindrical part are of an integral structure; the diameter of the cylindrical portion is the inner diameter of the outer sleeve minus 2.5 times the wall thickness of the inner sleeve.

Based on the structure of the expansion type raw bamboo structure connecting device, the length of the cylindrical part is the same as that of the splitting part of the expansion end of the inner sleeve, and the length of the cone part is the same as that of the cylindrical part; and the diameter of the conical part is half of that of the cylindrical end.

Based on the structure of the expansion type raw bamboo structure connecting device, the bamboo wedge comprises a wood wedge end part and a wedge tongue; the end part of the wood wedge and the wedge tongue are respectively arranged at two ends of the bamboo-wood wedge, the width of the end part of the wood wedge is the width of the splitting part of the expansion end of the inner sleeve, and the length of the end part of the wood wedge is equal to the length of the splitting part of the inner sleeve; the length of the wedge tongue is also equal to the length of the split part of the inner sleeve.

The scheme also provides a preparation method of the expansion type raw bamboo structure connecting device, which specifically comprises the following steps:

the method comprises the following steps: reinforcing the outer sleeve by bamboo strips, and winding the outer sleeve by soaking the bamboo strips in structural adhesive to form a screw-shaped outer surface;

step two: manufacturing an inner sleeve expansion end, namely selecting a bamboo inner sleeve with a node ring, wherein the distance from the node ring to the sleeved end is equal to the length of an inner sleeve expansion core, and dividing the cylinder input end into equal-distance splitting by using a tool according to a preset distance along the vertical direction of the outer wall of the sleeve;

step three: manufacturing an inner sleeve expansion core, namely processing a solid wood into a structure with one cylindrical end and the other conical end;

step four: processing a slope-type bamboo-wood wedge, wherein one end of the bamboo-wood wedge is in a slope shape;

step five: the inner sleeve and the outer sleeve are connected through expansion joints;

A. directly sleeving the expansion core into the expansion end of the inner sleeve, and propping the end of the cone of the expansion core onto the bamboo joint of the inner sleeve; at the moment, the splitting part of the expansion end of the inner sleeve is trumpet-shaped;

B. inserting the bamboo wedge into each distance between the expansion end of the inner sleeve and the expansion core, and splitting equally, wherein the end part of the wedge tongue is exposed for a certain length to ensure that the diameter size after being tightly wrapped is smaller than the inner diameter size of the outer sleeve;

C. tightening the horn splitting part of the expansion end of the inner sleeve, the bamboo-wood wedge and the wrapping body around the section of the expansion core of the sleeve by using an adhesive tape;

D. coating delayed coagulation structural adhesive on the inner wall of the outer sleeve, and sleeving the part with the wood wedge end, which is tightened by the wrapping body around the adhesive tape in the step C, into the outer sleeve, when the bamboo wedge contacts the bamboo section of the outer sleeve, pressurizing is started between the inner sleeve and the outer sleeve, at the moment, the end part of the wood wedge enters between the wall of the inner sleeve and the cone expansion core (wedge), and along with the gradual propulsion of the end part of the wood wedge, the expansion and pressurization are started between the wall of the inner sleeve and the wall of the outer sleeve;

E. when the inner sleeve is pressurized until the split part end of the inner sleeve contacts with the bamboo joint of the outer sleeve, the pressurization is stopped, at least an expansion bonding end with a tight silk joint of more than 10 centimeters is formed, and after the inner sleeve is placed statically for a plurality of hours, the expansion type bamboo joint point connection is completed.

In the third step, the diameter of the end part of the cylinder is equal to the inner diameter of the outer sleeve minus the wall thickness of the inner sleeve by 2.5 times, the length of the cylinder at the expansion end is equal to the splitting part of the expansion end of the inner sleeve, the length of the cone is equal to the diameter of the cylinder at the expansion end, and the diameter of the end part of the cone is about one half of the diameter of the end part of the cylinder.

In the fourth step, the thickness of the end part of the wooden wedge is equal to the thickness of the inner sleeve, the width of the wooden wedge is 5-10 cm of the splitting part of the inner sleeve, the length of the wooden wedge is equal to the length of the splitting part of the inner sleeve (about 10 cm), and the length of the wedge tongue is about 10 cm.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the invention only uses bamboo (green sustainable building material), does not damage the principle of original bamboo (no punching and grooving on the original bamboo), utilizes the working principle of expansion bolts to enhance the inosculation (tight silk seaming) between the inner wall and the outer wall of the original bamboo sleeve, reduces the processing cost, improves the connection strength (the tensile strength of the bamboo joint can almost reach the strength of the original bamboo after the test of expansion connection), and carries out the expansion connection of the inner sleeve and the outer sleeve on the original bamboo.

2. The invention fully utilizes the advantage of green and renewable bamboo wood, and does not add other high-energy-consumption materials which influence sustainable development; the method that the stress performance of the original material is influenced by the hole on the original material is overcome; the problems that the inner wall and the outer wall of the original bamboo sleeve are not well matched, so that the bonding is not uniform, and the connection strength is seriously damaged are solved; the original bamboo is not processed in an ideal way, and the problems of high processing cost, low efficiency, time consumption and the like are solved.

Drawings

FIGS. 1-5 are schematic diagrams of different prior art techniques;

FIG. 6 is a schematic view of the construction of the outer sleeve of the present invention;

FIG. 7 is a schematic view of the inner sleeve of the present invention;

FIG. 8 is a schematic view of the structure of an expanded core in the present invention;

FIG. 9 is a schematic view showing the structure of the present invention in which the expansion core is inserted into the inner sleeve;

FIG. 10 is a schematic view of the bamboo wedge of the present invention;

FIG. 11 is a schematic view of the service isolation assembly of the present invention closed;

FIG. 12 is a schematic view showing the construction of the bamboo wedge inserted into the space between the expansion end and the expansion core according to the present invention;

FIG. 13 is a schematic view of the structure of FIG. 12 secured by adhesive tape;

FIG. 14 is a schematic view of the overall assembly of the present invention;

description of the drawings: 1. an outer sleeve; 2. an inner sleeve; 3. an expanded core; 4. bamboo-wood wedges; 5. bamboo joints; 6. Structural adhesive; 11. a bamboo strip reinforcing layer; 21. an expansion end; 22. a connecting end; 23. a first rod ring; 24. An outer end portion; 31. a cone portion; 32. a cylindrical portion; 41. the end part of the wood wedge; 42. and 4, wedging a tongue.

Detailed Description

All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.

Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.

Example 1

As shown in fig. 6 to 14, the expansion type raw bamboo structure connecting device comprises an outer sleeve 1, an inner sleeve 2, an expansion core 3 and bamboo wedges 4; one end of the inner sleeve 2 is provided with an expansion end 21, the expansion core 3 passes through the expansion end 21 of the inner sleeve 2 and is clamped in the inner sleeve 2, and the expansion end 21 of the inner sleeve 2 is arranged in the outer sleeve 1; the bamboo-wood wedge 4 is arranged in the gap between the expansion end 21 and the expansion core 3, and the bamboo-wood wedge 4 is tightly contacted with the expansion end 21 along with the increase of the depth of the expansion end 21 of the inner sleeve 2 embedded into the outer sleeve 1, so that the expansion end 21 of the inner sleeve 2 is forced to be tightly contacted with the inner wall of the outer sleeve 1.

Based on above-mentioned structure, when inner skleeve 2 pushed into outer sleeve 1, bamboo wood wedge 4 at the joint between inner skleeve 2 inflation end 21 and inflation core 3 in with the bamboo joint 5 contact in outer sleeve 1, when pushing the outer sleeve 1 with inner skleeve 2 and deepening the degree of depth, bamboo wood wedge 4 contacts with the bamboo joint 5 of outer sleeve 1, the terminal surface that makes bamboo wood wedge 4 keep away from 1 bamboo joint 5 of outer sleeve is embedded into the clearance between inflation core 3 and the inflation end 21 deepening, make the inner skleeve 2 inflation end 21 with the inner wall contact of outer sleeve 1 with inseparable, accomplish stable connection.

The outer sleeve 1 is provided with a bamboo batten reinforcing layer 11, and the bamboo batten reinforcing layer 11 is fixedly connected with the outer sleeve 1 through structural adhesive 6;

the inner sleeve 2 comprises an expansion end 21, a connecting end 22, a first rod ring 23 and an outer end 24; the expansion end 21 is a plurality of equally divided splitting ends with the same length; the connecting end 22 is connected to the expansion end 21, and the first rod ring 23 is arranged between the connecting end 22 and the outer end 24;

the outer diameter of the inner sleeve is smaller than the inner diameter of the outer sleeve, so that the inner sleeve can be smoothly inserted into the outer sleeve 1; the distance from the expansion end 21 to the first rod ring 23 is the clamping distance of the inner sleeve 2 to the outer sleeve 1.

The equal splitting end is split by 5-10 equal parts; guarantee the inflation effect, with the inflation contact dynamics in later stage, make joint strength better.

The expansion core 3 comprises a conical part 31 and a cylindrical part 32, the expansion core 3 is of a solid wood structure, and the conical part 31 and the cylindrical part 32 are of an integral structure;

the diameter of the cylindrical part 32 is-2.5 times of the inner diameter of the outer sleeve 1, so that the expansion core 3 can be inserted into the outer sleeve 1 when the split wall of the inner sleeve 2 is tightened after being embedded into the inner sleeve 2.

The length of the cylindrical part 32 is the same as that of the splitting part of the expansion end 21 of the inner sleeve 2, and the length of the conical part 31 is the same as that of the cylindrical part 32; and the diameter of the conical part 31 is about one half of the diameter of the cylindrical end;

the bamboo-wood wedge 4 comprises a wood wedge end part 41 and a wedge tongue 42; the wooden wedge end part 41 and the wedge tongue 42 are respectively arranged at two ends of the bamboo-wood wedge 4, the width of the wooden wedge end part 41 is the width of the splitting part of the expansion end 21 of the inner sleeve 2, and the length of the wooden wedge end part 41 is equal to the length of the splitting part of the inner sleeve 2; the length of the wedge tongue 42 is also equal to the length of the split part of the inner sleeve 2;

according to the scheme, only bamboo (green sustainable building materials) is used, the principle of original bamboo (namely that the original bamboo is not punched or grooved) is not damaged, the working principle of the expansion bolt is utilized, the inosculation (tight silk seaming) between the inner wall and the outer wall of the original bamboo sleeve is enhanced, the processing cost is reduced, the connection strength is improved (the tensile strength of bamboo nodes can almost reach the strength of the original bamboo after the expansion connection is tested), and the stable connection is carried out on the original bamboo by the expansion method of the outer sleeve 1.

Example 2

Based on the embodiment 1, the scheme provides an expansion type raw bamboo structure connection method, which specifically comprises the following steps:

the method comprises the following steps: reinforcing the outer sleeve 1 by bamboo strips, wherein the outer sleeve 1 is used for preventing the original bamboo outer sleeve 1 from being split in a hollow mode, the outer sleeve 1 is wound by soaking structural adhesive 6 in the bamboo strips (the bamboo strips are split into long bamboo strips with certain specification and size (about 5 mm) and basically rectangular cross sections by a knife after being split by a bamboo tube), a screw-shaped outer surface is formed, and the reinforcing length of the outer sleeve 1 by the bamboo strips is about more than 20 cm; as described in figure 6

Step two: the expansion end 21 of the inner sleeve 2 is manufactured, a bamboo inner sleeve 2 (the diameter of which is smaller than that of the outer sleeve 1 is selected to ensure that the bamboo inner sleeve 2 can smoothly enter the outer sleeve 1), the inner sleeve 2 is provided with a node ring, the distance from the node ring to the sleeved end is equal to the length of an expansion core 3 (wedge) of the inner sleeve 2, the cylinder entering end is split equally by a tool such as a knife and the like along the vertical direction of the outer wall of the sleeve by a distance of 5-10 cm, and the length is more than 20 cm. As described in figure 7

Step three: the manufacturing of 2 inflation cores 3 (wedges) of inner skleeve, find a solid wood, make cylinder + cone shape, the diameter size of cylinder tip is "the inner diameter of outer skleeve 1 subtracts inner skleeve 22.5 times wall thickness (guarantee that the wooden wedge is stabbed to can also poke in the outer skleeve 1 after 2 splitting walls of inner skleeve tighten up behind 2 inner skleeves)", the length size of expansion end 21 cylinder equals the partial length of expansion end 21 splitting of inner skleeve 2, the length size of cone is equal to the cylindrical size of expansion end 21, the diameter size of cone tip is about half of the diameter size of cylinder tip. As shown in fig. 8

Step four: processing a slope type bamboo-wood wedge 4, wherein the thickness of the end part 41 of the wood wedge is equal to the thickness of the inner sleeve 2, the width of the wood wedge is 5-10 cm of the splitting part of the inner sleeve 2, the length of the wood wedge is equal to the length of the splitting part of the inner sleeve 2 (about 10 cm), and the length of a wedge tongue 42 is about 10 cm; as shown in fig. 10;

step five: the expansion joints of the inner sleeve and the outer sleeve 1 are connected,

A. firstly, directly inserting an expansion core 3 (wedge) of an inner sleeve 2 into an expansion end 21 of the inner sleeve 2, and propping the conical end of the expansion core 3 (wedge) onto bamboo joints 5 (sheath rings); at this time, the split part of the expansion end 21 of the inner sleeve 2 is in a horn shape as shown in FIG. 9;

B. the slope type bamboo-wood wedges 4 are inserted into the splitting wall part of the inner sleeve 2 (one slope type bamboo-wood wedge 4 needs to be arranged below each splitting wall), the end parts of the wedge tongues 42 are exposed for a certain length, and the diameter size after being tightly wrapped is ensured to be smaller than the inner diameter size of the outer sleeve 1; as shown in FIG. 11;

C. by utilizing the flexibility of the bamboo wall, the narrow adhesive tape is used for tightening the horn splitting part of the expansion end 21 of the inner sleeve 2, the slope type bamboo-wood wedge 4 and the surrounding of the section of the expansion core 3 (wedge) of the sleeve, as shown in figure 12;

D. firstly, coating delayed coagulation type structural adhesive 6 on the inner wall of an outer sleeve 1 reinforced by bamboo strips, sleeving a part with a wood wedge end, which is tightened by wrapping around the adhesive tape, into the outer sleeve 1, and when a slope type bamboo-wood wedge 4 contacts bamboo joint 5 (a bamboo sheath ring) of the outer sleeve 1, pressurizing between the inner sleeve 1 and the outer sleeve 1, wherein at the moment, the big end of the slope type bamboo-wood wedge 4 enters between the wall of the inner sleeve 2 and a cone expansion core 3 (wedge), and along with the gradual push of the big end of the slope type bamboo-wood wedge 4, the expanding and pressurizing between the wall of the inner sleeve 1 and the wall of the outer sleeve 1 are started, as shown in figure 13;

E. until the split end of the inner sleeve 2 contacts the bamboo joint 5 (bamboo joint ring) of the outer sleeve 1, pressurizing is stopped, at least an expansion bonding end with a tight silk joint of more than 10 cm is formed, and after standing for a plurality of hours (generally, the final setting time of the delayed coagulation type structural adhesive 6), expansion type bamboo joint 5 point connection is completed, as shown in fig. 14.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A preparation method of an expansion type raw bamboo structure connecting device is characterized by comprising the following steps: the method comprises an expansion type original bamboo structure connecting device, wherein the connecting device comprises an outer sleeve, an inner sleeve, an expansion core and bamboo wedges; one end of the inner sleeve is provided with an expansion end, the expansion core passes through the expansion end of the inner sleeve and is clamped in the inner sleeve, and the expansion end of the inner sleeve is arranged in the outer sleeve; the bamboo-wood wedge is arranged in a gap between the expansion end and the expansion core, and the bamboo-wood wedge is tightly contacted with the expansion end along with the increase of the depth of the expansion end of the inner sleeve embedded into the outer sleeve, so that the expansion end of the inner sleeve is forced to be tightly contacted with the inner wall of the outer sleeve;

the outer sleeve is provided with a bamboo strip reinforcing layer, and the bamboo strip reinforcing layer is fixedly connected with the outer sleeve through structural adhesive;

the inner sleeve comprises an expansion end, a connecting end, a first rod ring and an outer end; the expansion ends are a plurality of equally divided splitting ends with the same length; the connecting end is connected with the expansion end, and the first rod ring is arranged between the connecting end and the outer end part;

the outer diameter of the inner sleeve is smaller than the inner diameter of the outer sleeve, and the equal splitting end is split in an equal range of 5 to 10;

the expansion core comprises a cone part and a cylinder part, and the cone part and the cylinder part are of an integral structure; the diameter of the cylindrical part is the inner diameter of the outer sleeve minus 2.5 times of the wall thickness of the inner sleeve;

the length of the cylindrical part is the same as that of the splitting part of the expansion end of the inner sleeve, and the length of the conical part is the same as that of the cylindrical part; the diameter of the cone part is one half of that of the cylindrical end part;

the bamboo wedge comprises a wood wedge end part and a wedge tongue; the wood wedge end part and the wedge tongue are respectively arranged at two ends of the bamboo-wood wedge, the width of the wood wedge end part is the width of the splitting part of the expansion end of the inner sleeve, and the length of the wood wedge end part is equal to the length of the splitting part of the inner sleeve; the length of the wedge tongue is also equal to the length of the splitting part of the inner sleeve;

the method specifically comprises the following steps:

step four: processing a slope type bamboo wedge, wherein one end of the bamboo wedge is in a slope shape;

A. directly sleeving the expansion core into the expansion end of the inner sleeve, and enabling the end part of the expansion core cone to be propped onto the bamboo joint of the inner sleeve; at the moment, the splitting part of the expansion end of the inner sleeve is trumpet-shaped;

D. coating delayed coagulation structural adhesive on the inner wall of the outer sleeve, and sleeving the part with the wood wedge end, which is tightened by wrapping the adhesive tape around the tape C, into the outer sleeve, wherein when the bamboo wedge contacts the bamboo section of the outer sleeve, pressurization is started between the inner sleeve and the outer sleeve, at the moment, the end part of the wood wedge enters between the wall of the inner sleeve and the conical body of the expansion core, and along with the gradual propulsion of the end part of the wood wedge, the expansion pressurization is started between the wall of the inner sleeve and the wall of the outer sleeve;

E. and when the inner sleeve is pressurized until the split part end of the inner sleeve contacts the bamboo joint of the outer sleeve, the pressurization is stopped, at least an expansion bonding end with a 10 cm tight silk joint is formed, and after standing for a plurality of times, the expansion type bamboo joint point connection is completed.

2. The method for manufacturing an expanded raw bamboo structure connecting device according to claim 1, wherein: in the third step, the diameter of the end part of the cylinder is equal to the inner diameter of the outer sleeve minus the wall thickness of the inner sleeve by 2.5 times, the length of the cylinder at the expansion end is equal to the splitting part length of the expansion end of the inner sleeve, the length of the cone is equal to the diameter of the cylinder at the expansion end, and the diameter of the end part of the cone is one half of the diameter of the end part of the cylinder.

3. The method for manufacturing the expanded raw bamboo structure connecting device according to claim 2, wherein the method comprises the following steps: in the fourth step, the thickness of the end part of the bamboo wedge is equal to the thickness of the inner sleeve, the width of the wood wedge is equal to the width of the split part of the inner sleeve, specifically 5-10 cm, the length of the wood wedge is equal to the length of the split part of the inner sleeve, specifically 10 cm, and the length of the wedge tongue is specifically 10 cm.