Sunken stepped assembly structure and method based on pelelith material
By using a combination of connecting posts, expansion sleeves, and nuts, the problem of exposed gaps after connecting volcanic rock materials was solved, achieving seamless stone block connections and improving the aesthetics and stability of the assembly structure.
Patent Information
- Application Number
- CN202511505942.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-21
- Publication Date
- 2025-12-19
AI Technical Summary
In existing technologies, gaps are easily created when volcanic rock materials are joined together, leading to the exposure of the connecting parts.
The connector includes a connecting column, a first expansion sleeve, and a nut. After the first expansion sleeve is tightened, the expansion head of the connecting column is aligned with the limiting groove to prevent detachment. The nut follows the stone down into the countersunk hole to avoid gaps between the stones.
This effectively avoids gaps between stones, ensures that the connectors are not exposed, and improves the overall aesthetics and stability of the sunken, stepped assembly structure made of volcanic rock.
Smart Images
Figure CN121161995A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of building technology, specifically relating to fasteners for buildings, and more particularly to a sunken stepped assembly structure and assembly method based on volcanic rock material. Background Technology
[0002] Conventional hotel lobby designs are mostly flat and spacious areas, while lobby designs involving sunken areas are particularly rare, especially sunken lobby lounge designs that combine volcanic rock and stone materials to create a unique aesthetic.
[0003] In related technologies, in order to connect volcanic rocks, connectors are usually installed on the two rocks respectively, and then the two connectors are fixed to fix the two rocks; however, the above method will leave a gap between the two rocks, so that the connectors are exposed.
[0004] Therefore, how to solve the technical problem of gaps appearing after two stones are joined is a problem that urgently needs to be solved by those skilled in the art.
[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention
[0006] This disclosure provides at least one sunken stepped assembly structure and assembly method based on volcanic rock material.
[0007] In a first aspect, embodiments of this disclosure provide a recessed stepped assembly structure based on volcanic rock material, comprising: a plurality of stones stacked to form a stepped shape; a plurality of connectors for connecting corresponding stones stacked vertically, the connectors comprising: a connecting post, a first expansion sleeve located below, a second expansion sleeve located above, and a nut; the first expansion sleeve is used to insert into a first mounting hole in the lower stone, the lower part of the connecting post is used to insert into and pass through the first expansion sleeve to tighten the first expansion sleeve; and the second expansion sleeve is used to be fitted onto the upper part of the connecting post and follows the connecting post into a second mounting hole in the upper stone, and then the connecting post is moved downward by the rotation of the nut to tighten the second expansion sleeve; wherein, after the nut is tightened, the upper stone descends and fits against the lower stone, so that the nut on the connecting post descends with the upper stone to be submerged in the recess of the lower stone.
[0008] In one optional embodiment, a first perforation is provided at the axis of the first expansion sleeve; the lower part of the first perforation contracts inward; wherein the first expansion sleeve has a plurality of first slits on the side wall at the contraction of the first perforation.
[0009] In an alternative embodiment, the lower end of the connecting column is provided with a first expansion head; a side wall of the first expansion head is provided with a pair of anti-disengagement blocks; a side wall of the first through hole is provided with a pair of guide grooves.
[0010] In an alternative embodiment, a lower surface of the first expansion sleeve is provided with a pair of limiting grooves; the limiting grooves are arranged orthogonally to the guide grooves; the first cutouts are arranged in a staggered manner with the guide grooves and the limiting grooves; the connecting column is adapted to be rotated by 90 degrees after passing through the first expansion sleeve at the lower portion, so that the anti-disengagement blocks are aligned with the limiting grooves.
[0011] In an alternative embodiment, a second through hole is formed at the axis of the second expansion sleeve; a plurality of second cutouts are formed in the side wall of the second expansion sleeve at the second through hole; a middle portion of the connecting column is provided with external threads; an upper end of the connecting column is provided with a second expansion head; the nut is sleeved on the connecting column and connected with the external threads thereon, so as to drive the second expansion head of the connecting column to descend by rotation to tighten the second expansion sleeve.
[0012] In an alternative embodiment, a flat washer and a spring washer are sleeved on the connecting column.
[0013] In a second aspect, the disclosure embodiments further provide an assembly method of a sunken step-shaped assembly structure based on a volcanic stone material, comprising: forming a second mounting hole in an upper stone block, forming a first mounting hole in a lower stone block, and forming a counterbore at the aperture of the first mounting hole; connecting a lower portion of at least two connecting members with the first mounting hole, and then rotating a connecting column of the connecting member to prevent disengagement; connecting an upper portion of the connecting member with the second mounting hole; and adhering the upper stone block to the lower stone block.
[0014] In an alternative embodiment, the method of connecting the lower portion of the connecting member with the first mounting hole and then rotating the connecting column of the connecting member to prevent disengagement comprises: inserting the first expansion sleeve into the first mounting hole; inserting and passing the first expansion head of the connecting column through the first expansion sleeve to tighten the first expansion sleeve; and rotating the connecting column to align the anti-disengagement blocks on the first expansion head with the limiting grooves on the first expansion sleeve.
[0015] In an alternative embodiment, the method of connecting the upper portion of the connecting member with the second mounting hole comprises: inserting the connecting column with the second expansion sleeve into the second mounting hole; and tightening the second expansion head of the connecting column by rotating the nut to tighten the second expansion sleeve.
[0016] In an alternative embodiment, in the method of adhering the upper stone block to the lower stone block, the nut on the connecting column descends with the upper stone block to immerse into the counterbore.
[0017] The beneficial effects of the present application are that the volcano stone material based sunken step assembly structure and assembly method connect the upper and lower stones by adopting at least two connecting pieces, the first expansion head of the connecting column is penetrated through the first expansion sleeve, and the anti-dropping block on the first expansion head is aligned with the limiting groove on the first expansion sleeve by rotating to achieve anti-dropping; after connecting the upper and lower stones, the nut on the connecting column can descend with the upper stone and sink into the counterbore of the lower stone by the lowerable setting of the connecting column, so that a gap is avoided between the two stones.
[0018] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the description and the drawings.
[0019] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.
[0021] Figure 1 A sunken step stacking structure of a volcano stone provided by the embodiment of the present disclosure is shown in the figure; Figure 2 A structure diagram of a connecting piece provided by the embodiment of the present disclosure is shown in the figure; Figure 3 A structure diagram of a first mounting hole provided by the embodiment of the present disclosure is shown in the figure; Figure 4 A structure diagram of a first expansion sleeve provided by the embodiment of the present disclosure is shown in the figure; Figure 5 A cross-sectional structure diagram of a first expansion sleeve provided by the embodiment of the present disclosure is shown in the figure; Figure 6 A structure diagram of a connecting column provided by the embodiment of the present disclosure is shown in the figure; Figure 7 A structure diagram of a limiting groove provided by the embodiment of the present disclosure is shown in the figure; Figure 8 A structure diagram of a second expansion sleeve provided by the embodiment of the present disclosure is shown in the figure; Figure 9A schematic diagram illustrating the principle of an assembly method provided in an embodiment of this disclosure; Figure 10 A cross-sectional view of a connector connected to a lower stone block according to an embodiment of this disclosure; Figure 11 A cross-sectional view of a connector connected to an upper stone block according to an embodiment of this disclosure; Figure 12 This is a cross-sectional view of an upper stone block and a lower stone block connected in an embodiment of this disclosure.
[0022] In the picture: 1. Stone; 11. First mounting hole; 111. Countersunk hole; 12. Second mounting hole; 2. Connecting parts; 21. Connecting post; 211. First expansion head; 212. Anti-detachment block; 213. External thread; 214. Second expansion head; 215. Anti-rotation block; 22. First expansion sleeve; 221. First through hole; 222. First cut; 223. Guide groove; 224. Limiting groove; 23. Second expansion sleeve; 231. Second through hole; 232. Second cut; 24. Nut; 25. Flat washer; 26. Spring washer. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the figures, the thickness of parts may be exaggerated or reduced for the purpose of effectively depicting the technical content.
[0025] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0026] like Figures 1 to 3 As shown, at least one embodiment provides a sunken stepped assembly structure based on volcanic rock material, including: a plurality of stone blocks 1 and a plurality of connectors 2.
[0027] Specifically, stone 1 is made of volcanic rock, and the stones are stacked to form a stepped shape.
[0028] Specifically, the connecting piece 2 is used for connecting the corresponding stone blocks 1 stacked up and down, and at least two connecting pieces 2 are arranged on each stone block 1; the connecting piece 2 comprises a connecting column 21, a first expansion sleeve 22 located below, a second expansion sleeve 23 located above, and a nut 24; wherein the first expansion sleeve 22 is used for being inserted into the first mounting hole 11 of the lower stone block 1, the lower part of the connecting column 21 is used for being inserted into and passing through the first expansion sleeve 22 to make the first expansion sleeve 22 tight, and the second expansion sleeve 23 is used for being sleeved on the upper part of the connecting column 21 and being inserted into the second mounting hole 12 of the upper stone block 1 along with the connecting column 21, and then the connecting column 21 is lowered to make the second expansion sleeve 23 tight through the rotation of the nut 24.
[0029] In the embodiment, after the nut 24 is locked, a gap is left between the upper stone block 1 and the lower stone block 1, at this time, the upper stone block 1 is fitted with the lower stone block 1 by lowering the height, so that the nut 24 on the connecting column 21 is lowered along with the upper stone block 1 and immersed into the counterbore 111 of the lower stone block 1, thereby avoiding leaving a gap between the two stone blocks 1 to expose the connecting piece 2.
[0030] As shown in Figure 4 , Figure 5 , in some embodiments, a first perforation 221 is formed at the axis of the first expansion sleeve 22; the lower part of the first perforation 221 is inwardly contracted; wherein a plurality of first notches 222 are formed in the side wall of the first expansion sleeve 22 at the contraction of the first perforation 221.
[0031] Specifically, the first notches 222 are used for facilitating the outward expansion of the first expansion sleeve 22.
[0032] In the embodiment, the first expansion sleeve 22 is first arranged in the first mounting hole 11, and then the lower end of the connecting column 21 is inserted into the first mounting hole 11, so that the lower part of the first expansion sleeve 22 is expanded outwardly by the connecting column 21 to achieve tightness.
[0033] As shown in Figure 6 , in some embodiments, a first expansion head 211 is arranged at the lower end of the connecting column 21; wherein a pair of anti-drop blocks 212 are arranged on the side wall of the first expansion head 211; and a pair of guide grooves 223 are formed in the side wall of the first perforation 221.
[0034] Specifically, the first expansion head 211 is detachably connected with the connecting column 21; optionally, a threaded column is arranged on the upper end surface of the first expansion head 211, a threaded hole is formed in the lower surface of the connecting column 21, and the first expansion head 211 is threadedly connected with the connecting column 21.
[0035] As shown in Figure 7As shown, in some embodiments, the lower surface of the first expansion sleeve 22 is provided with a pair of limiting grooves 224; the limiting grooves 224 are arranged orthogonally to the guide groove 223; the first cutout 222 is arranged staggeredly with the guide groove 223 and the limiting grooves 224; the connecting column 21 is adapted to rotate 90 degrees after passing through the first expansion sleeve 22 at the lower part, so as to align the anti-disengagement block 212 with the limiting grooves 224.
[0036] In the present embodiment, when the first expansion head 211 is inserted into the first through hole 221, the anti-disengagement block 212 of the side wall of the first expansion head 211 moves along the guide groove 223; after the first expansion head 211 expands the first expansion sleeve 22 outward, the first expansion head 211 continues to descend until it passes through the first expansion sleeve 22; then the connecting column 21 is rotated 90 degrees to align the anti-disengagement block 212 with the limiting grooves 224, at this time, the connecting column 21 cannot be pulled out when pulled upward, thereby achieving the anti-disengagement effect.
[0037] As shown, Figure 8 in some embodiments, the second expansion sleeve 23 is provided with a second through hole 231 at the axis; the second expansion sleeve 23 is provided with a plurality of second cutouts 232 at the side wall of the second through hole 231.
[0038] In the present embodiment, the second expansion sleeve 23 is sleeved on the upper part of the connecting column 21 through the second through hole 231, and the second expansion sleeve 23 is inserted into the second mounting hole 12 on the upper stone 1 together with the connecting column 21.
[0039] As shown, Figure 6 in some embodiments, the middle part of the connecting column 21 is provided with external threads 213; the upper end of the connecting column 21 is provided with a second expansion head 214; the nut 24 is sleeved on the connecting column 21 and connected with the external threads 213 on the connecting column 21.
[0040] In the present embodiment, after the connecting column 21 and the second expansion sleeve 23 are inserted into the second mounting hole 12, the nut 24 is rotated to move the connecting column 21 downward, so that the second expansion head 214 on the connecting column 21 expands the second expansion sleeve 23 to achieve the expansion.
[0041] As shown, Figure 6 in some embodiments, the side wall of the connecting column 21 is provided with a pair of anti-rotation blocks 215.
[0042] In the present embodiment, the anti-rotation blocks 215 are located in the second cutouts 232, which can reduce the probability of the connecting column 21 rotating together with the nut 24 when the nut 24 is rotated.
[0043] As shown, Figure 2 the connecting column 21 is sleeved with a flat washer 25 and a spring washer 26.
[0044] In the embodiment, the flat gasket 25 and the spring gasket 26 serve to enable the nut 24 to better achieve locking.
[0045] As Figure 9 shown, at least one embodiment also provides an assembly method of the sunken step-like assembly structure based on the volcanic stone material, which comprises the following steps: opening a second mounting hole 12 on the upper stone block 1, opening a first mounting hole 11 on the lower stone block 1, and opening a counterbore 111 at the aperture of the first mounting hole 11; connecting the lower part of at least two connecting members 2 with the first mounting hole 11, and then rotating the connecting column 21 of the connecting member 2 to prevent it from being detached; connecting the upper part of the connecting member 2 with the second mounting hole 12; and adhering the upper stone block 1 to the lower stone block 1.
[0046] For the specific structure and implementation process of the sunken step-like assembly structure based on the volcanic stone material, refer to the relevant description in the above embodiments, which will not be repeated here.
[0047] As Figure 10 shown, in some embodiments, the method of connecting the lower part of the connecting member 2 with the first mounting hole 11 and then rotating the connecting column 21 of the connecting member 2 to prevent it from being detached comprises the following steps: inserting the first expansion sleeve 22 into the first mounting hole 11; inserting and passing the first expansion head 211 of the connecting column 21 through the first expansion sleeve 22 to make the first expansion sleeve 22 tight; and rotating the connecting column 21 to align the anti-detachment block 212 on the first expansion head 211 with the limiting groove 224 on the first expansion sleeve 22.
[0048] In the embodiment, the first expansion sleeve 22 is first expanded and tight by the insertion of the connecting column 21, at this time, if the connecting column 21 is subjected to an upward force, the connecting column 21 is easy to be detached from the first expansion sleeve 22; therefore, the first expansion head 211 of the connecting column 21 is inserted and passed through the first expansion sleeve 22, and then the connecting column 21 is rotated, so that the anti-detachment block 212 on the connecting column 21 is aligned with the limiting groove 224, at this time, the connecting column 21 cannot be detached from the first expansion sleeve 22 even if it is subjected to an upward force.
[0049] As Figure 11 shown, in some embodiments, the method of connecting the upper part of the connecting member 2 with the second mounting hole 12 comprises the following steps: inserting the connecting column 21 with the second expansion sleeve 23 into the second mounting hole 12; and rotating the nut 24 to make the second expansion head 214 on the connecting column 21 tight the second expansion sleeve 23.
[0050] In the embodiment, after the connecting member 2 is connected with the lower stone block 1, the upper stone block 1 is connected with the connecting member 2, at this time, although the connecting member 2 is connected with the upper stone block 1, there will be a gap between the upper and lower stone blocks 1.
[0051] AsFigure 11 As shown, in some embodiments, in the process of fitting the upper stone block 1 with the lower stone block 1, the nut 24 on the connecting column 21 is lowered with the upper stone block 1 to sink into the counterbore 111.
[0052] In the present embodiment, the depth of the second mounting hole 12 is sufficient for the connecting column 21 to lower; after the connecting column 21 tightens the second expansion sleeve 23, the upper stone block 1 is lowered to eliminate the gap between the upper and lower stone blocks 1, at which time the connecting column 21 moves downward relative to the first expansion sleeve 22, and the nut 24 and other components sink into the counterbore 111 to avoid exposure.
[0053] In summary, the present sunken step-like assembly structure and assembly method based on the volcanic rock material connects the upper and lower stone blocks 1 by using at least two connecting members 2, and the first expansion head 211 of the connecting column 21 is passed through the first expansion sleeve 22 and is positioned with the anti-disengagement block 212 on the first expansion head 211 and the limiting groove 224 on the first expansion sleeve 22 by rotating to achieve anti-disengagement. At the same time, after connecting the upper and lower stone blocks 1, the connecting column 21 is arranged to be lowerable, so that the nut 24 on the connecting column 21 can be lowered with the upper stone block 1 and sink into the counterbore 111 of the lower stone block 1, thereby avoiding a gap between the two stone blocks 1.
[0054] In this document, when referring to a first component being on a second component, this can mean that the first component can be formed directly on the second component, or a third component can be interposed between the first component and the second component.
[0055] Other words used to describe the relationship between elements should be interpreted in a similar manner (for example, "between" versus "directly between", "adjacent" versus "directly adjacent", etc.). As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0056] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication of 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.
[0057] The terms such as "first", "second" and other numerical terms are used herein without implying a sequence or order, unless explicitly indicated above. Therefore, the first element, component, region, layer or section discussed above can be referred to as the second element, component, region, layer or section without departing from the teachings of the example embodiments.
[0058] Spatially relative terms, such as "inner," "outer," "beneath," "below," "lower," "above," "upper," and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms can be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
[0059] In the above discussion, unless otherwise stated, the terms "about," "approximately," "substantially" and the like, when used in the context of describing a numerical value, mean a variation of + / - 10% of the value.
[0060] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant personnel can certainly make various changes and modifications within the scope of not deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content in the specification, and must be determined according to the scope of claims.
Claims
1. A sunken, stepped assembly structure based on volcanic rock material, characterized in that, include: Several stones (1) are stacked to form a stepped structure; A number of connectors (2) are used to connect the corresponding stones (1) stacked on top of each other. The connectors (2) include: a connecting post (21), a first expansion sleeve (22) located below, a second expansion sleeve (23) located above, and a nut (24). The first expansion sleeve (22) is inserted into the first mounting hole (11) of the lower stone (1), and the lower part of the connecting post (21) is inserted into and protrudes from the first expansion sleeve (22) to tighten the first expansion sleeve (22); and The second expansion sleeve (23) is used to be sleeved on the upper part of the connecting post (21) and is inserted into the second mounting hole (12) of the upper stone (1) along with the connecting post (21). Then, the connecting post (21) is moved down by the rotation of the nut (24) to tighten the second expansion sleeve (23). After the nut (24) is tightened, the upper stone (1) descends and fits against the lower stone (1), so that the nut (24) on the connecting post (21) follows the upper stone (1) as it descends and is submerged in the countersunk hole (111) of the lower stone (1).
2. The sunken stepped assembly structure based on volcanic rock material as described in claim 1, characterized in that, The first expansion sleeve (22) has a first through hole (221) at its axis. The lower part of the first perforation (221) tapers inward; wherein The first expansion sleeve (22) has several first cuts (222) on the side wall at the contraction point of the first perforation (221).
3. The sunken stepped assembly structure based on volcanic rock material as described in claim 2, characterized in that, The lower end of the connecting column (21) is provided with a first expansion head (211); wherein The sidewall of the first expansion head (211) is provided with a pair of anti-detachment blocks (212). A pair of guide grooves (223) are provided on the side wall of the first perforation (221).
4. The sunken stepped assembly structure based on volcanic rock material as described in claim 3, characterized in that, A pair of limiting grooves (224) are provided on the lower surface of the first expansion sleeve (22); wherein The limiting groove (224) and the guide groove (223) are orthogonally arranged; The first cut (222) is offset from the guide groove (223) and the limiting groove (224); The connecting column (21) is adapted to rotate 90 degrees after passing through the first expansion sleeve (22) at the bottom, so that the anti-detachment block (212) is aligned with the limiting groove (224).
5. The sunken stepped assembly structure based on volcanic rock material as described in claim 4, characterized in that, A second through hole (231) is provided at the axis of the second expansion sleeve (23); The second expansion sleeve (23) has several second cuts (232) on the side wall of the second perforation (231); wherein The connecting post (21) has an external thread (213) in the middle. The upper end of the connecting column (21) is provided with a second expansion head (214). The nut (24) is sleeved on the connecting post (21) and connected to its external thread (213), and is used to drive the second expansion head (214) of the connecting post (21) to descend by rotation to tighten the second expansion sleeve (23).
6. The sunken stepped assembly structure based on volcanic rock material as described in claim 5, characterized in that, A flat washer (25) and a spring washer (26) are fitted on the connecting post (21).
7. An assembly method for a sunken stepped assembly structure based on volcanic rock material as described in any one of claims 1-6, characterized in that, include: A second mounting hole (12) is made on the upper stone (1), a first mounting hole (11) is made on the lower stone (1), and a countersunk hole (111) is made at the opening of the first mounting hole (11). Connect the lower part of at least two connectors (2) to the first mounting hole (11), and then rotate the connecting post (21) of the connector (2) to prevent it from coming off; Connect the upper part of the connector (2) to the second mounting hole (12); Fit the upper stone (1) with the lower stone (1).
8. The assembly method for the sunken stepped assembly structure based on volcanic rock material as described in claim 7, characterized in that, The method of connecting the lower part of the connector (2) to the first mounting hole (11) and then rotating the connecting post (21) of the connector (2) to prevent it from coming off includes: Insert the first expansion sleeve (22) into the first mounting hole (11); Insert the first expansion head (211) of the connecting post (21) into and out of the first expansion sleeve (22) to tighten the first expansion sleeve (22); Rotate the connecting column (21) to align the anti-detachment block (212) on the first expansion head (211) with the limiting groove (224) on the first expansion sleeve (22).
9. The assembly method for the sunken stepped assembly structure based on volcanic rock material as described in claim 8, characterized in that, The method of connecting the upper part of the connector (2) to the second mounting hole (12) includes: Insert the connecting post (21) with the second expansion sleeve (23) into the second mounting hole (12); By rotating the nut (24), the second expansion head (214) on the connecting column (21) is tightened to the second expansion sleeve (23).
10. The assembly method for the sunken stepped assembly structure based on volcanic rock material as described in claim 9, characterized in that, In the method of fitting the upper stone (1) with the lower stone (1), the nut (24) on the connecting post (21) descends with the upper stone (1) to be submerged in the sinkhole (111).