A rigid connector at an assembled joint and a construction method thereof

Abstract

A rigid connector at an assembled joint and a construction method thereof, belonging to the field of building technology, the connector includes a steel joint and a steel sleeve, the steel joint includes a regular hexagonal joint and an extended steel bar insert, the steel sleeve includes a steel sleeve barrel and a steel sleeve base, the steel sleeve barrel is provided with a regular hexagonal steel joint channel matching the regular hexagonal joint, the steel sleeve base is a hollow structure, and six isolation sheets are equidistantly provided around the inner wall of the steel sleeve base. By arranging a steel joint and a steel sleeve, and arranging the two into a matching hexagonal structure, and fixing them after grouting, the extended steel bar is connected and fixed.

Description

Technical Field

[0001] The invention belongs to the technical field of construction and relates to a rigid connector at an assembled joint and a construction method thereof. Background Art

[0002] Prefabricated construction technology is a major change in the construction method of construction projects. Under the strong advocacy of the country, after years of dedicated research and application by domestic backbone enterprises, ground prefabricated buildings have achieved gratifying results, relevant technologies and management systems have been initially established, and engineering applications have increased year by year. However, in the field of underground engineering in my country, the research and application of prefabricated assembly construction technology for large underground structures is still blank.

[0003] Foreign countries developed prefabrication and assembly technology for underground projects earlier than my country. In the late 19th century and early 20th century, prefabricated linings were used in foreign shield tunnel projects. After more than a hundred years of development, shield tunnels have been successfully used in many fields such as subways, highways, and municipal engineering. The cross-sections of tunnels are diverse, mainly circular, with diameters ranging from 3m to 18m. In addition to shield tunnels, the practice of using prefabricated linings for other underground structures originated in the 1980s to solve the impact of cold winter climate on cast-in-place concrete construction. Prefabrication and assembly technology has been studied and applied in projects such as subway section tunnels, station main bodies and auxiliary passages constructed by open-cut method. Early station structures mostly adopted a relatively complex rectangular prefabricated structure. The top plate, bottom plate, side wall, column and beam structure all adopted prefabricated assembly technology. The joints of the bottom plate components usually adopt cast-in-place reinforced concrete, and cups are reserved on them for the upper components to be connected later.

[0004] In my country, except for shield tunnels that use prefabricated linings, the application of prefabrication and assembly technology in other underground projects is basically limited to a small number of open-cut tunnel projects with smaller sections, such as municipal pipelines and pipe galleries. There have also been precedents for the partial use of prefabricated linings in railway mining tunnel projects, such as the prefabrication technology used in the invert of the West Qinling super-long railway tunnel, with walls and arches cast on site.

[0005] At present, the prefabricated assembly structure of ground buildings in my country is composed of prefabricated concrete components connected in a reliable way, and formed into an integral assembled concrete structure with on-site post-cast concrete and cement-based grouting materials, referred to as assembled integral structure. In the assembled integral structure, the longitudinal reinforcement at the nodes and joints can be connected by mechanical connection, sleeve grouting connection, grout anchor lap connection, welding connection or binding lap connection to achieve rigid connection of the joint. Of course, it was also found in the survey that the sleeve grouting connection method is currently widely used. Since the position of the embedded steel bars and sleeves of the prefabricated components is very easy to deviate, it is difficult to align the components during the actual connection process. Either the insertion is forced or the components are reprocessed. In addition, the quality of the sleeve grouting cannot be verified, and the post-cast strip template has serious grout leakage. Therefore, there is still room for further optimization and improvement in the form and construction process of assembled integral rigid joints.

[0006] The main research contents for subway stations include structural selection and mechanical behavior research, comprehensive joint technology research, key technology research of structural waterproofing, construction technology research and development of special construction equipment, large-scale prefabricated component production technology research, and multi-disciplinary integrated technology research for prefabricated subway stations.

[0007] The connection joints of prefabricated components are one of the core issues in the research of prefabricated structures. They are related to the overall stress state and bearing characteristics of the structure, as well as various aspects such as the component manufacturing process, construction and assembly process, and structural waterproof performance. Summary of the invention

[0008] In order to solve the above-mentioned technical problems, the present invention provides a rigid connector at an assembled joint and a construction method thereof, by setting a steel joint and a steel sleeve, and setting the two to a matching hexagonal structure, and fixing them after grouting, the extended steel bars are connected and fixed.

[0009] The present invention adopts the following technical solution:

[0010] A rigid connector at an assembled joint, the connector comprising a steel joint and a steel sleeve, the steel joint comprising a regular hexagonal joint and an extended steel bar insert, the extended steel bar insert is fixedly connected to the middle of the regular hexagonal joint, the steel sleeve comprises a steel sleeve barrel and a steel sleeve base, the steel sleeve barrel and the steel sleeve base are fixedly connected, a regular hexagonal steel joint channel matching the regular hexagonal joint is provided inside the steel sleeve barrel, an exhaust hole is provided on the upper part of the outer wall, a grouting hole is provided on the lower part, and the steel sleeve base The interior is a hollow structure, and six isolation plates are equidistantly arranged around the inner wall of the steel sleeve base. The cross-section of the isolation plate is Y-shaped, and cylindrical blocking bodies are arranged at both ends of the upper part. An exhaust hole is opened on the upper part of the outer wall of the steel sleeve base, and a grouting hole is arranged at the lower part. The protruding steel bar insert is fixedly connected to the protruding steel bar, and the steel joint is plug-connected to the steel sleeve. After the regular hexagonal joint is inserted into the steel sleeve base and rotated, its hexagonal corner fits on the cylindrical blocking body of the isolation plate. The steel joint and steel sleeve are fixedly connected by grouting after plugging.

[0011] Furthermore, the isolation sheet is arranged to be rotated 15 degrees relative to the position directly below the corresponding position of the regular hexagonal channel inside the steel sleeve cylinder.

[0012] Furthermore, the thickness of the steel sleeve base is greater than the thickness of the regular hexagonal joint, and the height of the isolation sheet is the same as the thickness of the steel sleeve base.

[0013] Furthermore, the outer walls of the steel sleeve barrel and the steel sleeve base are circular, exhaust holes and grouting holes are respectively opened on the left and right sides of the steel sleeve barrel, and six groups of exhaust holes and grouting holes are opened on the outer wall of the steel sleeve base between the isolation plates.

[0014] A construction method for a rigid connector at an assembled joint, wherein an extended steel bar is inserted into an extended steel bar insert pipe of the steel joint and then welded and fixed, the steel joint is inserted into a steel sleeve barrel portion with a hexagonal channel until it is inside a steel sleeve base, the regular hexagonal joint of the steel joint is rotated 15°, and the six corners of the regular hexagonal joint abut against a cylindrical blocking body on one side of an isolation plate and then stop rotating, and after grouting is poured into the steel sleeve barrel portion and the steel sleeve base, the whole is fixedly connected.

[0015] The present invention provides a rigid connection method for assembled joints, including a steel sleeve and a steel joint. After the steel sleeve and the extended steel bar with the steel joint are connected, the steel sleeve is rotated clockwise to form a whole, and then the gap in the steel sleeve is grouted to form a complete rigid structure. Grouting is performed on the joints and seams on site to make the structure a stable force-bearing whole.

[0016] The beneficial effects of the present invention are:

[0017] The connection is stable, the bearing capacity is high, the corrosion resistance is strong, the construction is convenient and fast, the transportation is convenient, it is not easy to be damaged during transportation, and the reinforcement is avoided during the construction process, thus shortening the working hours. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the rigid connector steel joint structure at the assembled joint of the present invention;

[0019] Figure 2 This is a schematic diagram of the steel sleeve structure of the rigid connector at the assembled joint of the present invention;

[0020] Figure 3 This is a schematic diagram of the steel sleeve base structure;

[0021] Figure 4 This is a schematic diagram of the structure of the steel sleeve base from a top view;

[0022] Figure 5 This is a schematic diagram of the position of the steel sleeve base after the steel joint is rotated;

[0023] Figure 6 This is a schematic diagram of the connection between the steel sleeve and the steel structure.

[0024] Components in the figure: 1 is a steel joint, 2 is a steel sleeve, 3 is a regular hexagonal joint, 4 is an extended steel bar insert, 5 is a steel sleeve barrel, 6 is a steel sleeve base, 7 is a regular hexagonal steel joint channel, 8 is a grouting hole, 9 is an exhaust hole, 10 is a spacer, and 11 is a cylindrical blocking body.

[0025] like Figure 3 As shown, since the isolation sheet 10 divides the central hollow structure into six areas, the grouting holes and the exhaust holes are divided into six groups according to the areas. DETAILED DESCRIPTION

[0026] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments.

[0027] A rigid connection method for assembled joints, in which two components are rigidly connected by steel bars, and a new type of steel sleeve in the form of a steel sleeve and a steel joint is used. The present invention can prevent damage to the joint due to external loads, and has high strength to resist corrosion. The structure includes a steel sleeve and a steel joint. The direct rigid connection of assembled components is achieved by setting a mechanical connection. The connecting part includes a steel joint 1 and a steel sleeve 2. The steel joint 1 includes a regular hexagonal joint 3 and an extended steel bar insert 4. The extended steel bar insert 4 is fixedly connected to the middle of the regular hexagonal joint 3. The steel sleeve 2 includes a steel sleeve barrel 5 and a steel sleeve base 6. The steel sleeve barrel 5 and the steel sleeve base 6 are fixedly connected. The steel sleeve barrel 5 is provided with a regular hexagonal steel joint channel 7 matching the regular hexagonal joint 3. The upper part of the outer wall is provided with an exhaust hole 9, and the lower part is provided with a grouting hole 8. The steel sleeve The interior of the base 6 is a hollow structure, and six isolation plates 10 are equidistantly arranged around the inner wall of the steel sleeve base 6. The cross-section of the isolation plate 10 is Y-shaped, and cylindrical blocking bodies 11 are arranged at both ends of the upper part. An exhaust hole 9 is opened on the upper part of the outer wall of the steel sleeve base 6, and a grouting hole 8 is arranged at the lower part. The protruding steel bar insert 4 is fixedly connected to the protruding steel bar, and the steel joint 1 is plugged into the steel sleeve 2. The regular hexagonal joint 3 is inserted into the steel sleeve base 6 and rotated, and its hexagonal corner fits on the cylindrical blocking body 11 of the isolation plate 10. The steel joint 1 and the steel sleeve 2 are fixedly connected by grouting after being plugged in.

[0028] The isolation sheet 10 is arranged to be rotated 15 degrees below the corresponding position of the regular hexagonal channel inside the steel sleeve barrel 5 .

[0029] The thickness of the steel sleeve base 6 is greater than that of the regular hexagonal joint 3 , and the height of the isolation sheet 10 is the same as the thickness of the steel sleeve base 6 .

[0030] The outer walls of the steel sleeve barrel 5 and the steel sleeve base 6 are circular, and exhaust holes 9 and grouting holes 8 are respectively provided on the left and right sides of the steel sleeve barrel 5. Six groups of exhaust holes 9 and grouting holes 8 are provided on the outer wall of the steel sleeve base 6 between the isolation plates 10.

[0031] The specific connection method is: insert the extended steel bar insert pipe 4 of the steel joint 1 into the extended steel bar and weld it to fix it, insert the steel joint 1 into the steel sleeve barrel 5 with a hexagonal channel until it is in the steel sleeve base 6, rotate the regular hexagonal joint 3 of the steel joint 1 by 15 degrees, stop rotating after the six corners of the regular hexagonal joint 3 abut against the cylindrical blocking body 11 on one side of the isolation piece 10, grout the steel sleeve barrel 5 and the steel sleeve base 6, and fix the connection as a whole to make it a fixed structure. After grouting, the steel joint will not be displaced in the fixed structure. Prevent the joint from falling off due to excessive rotation or insufficient rotation, and finally pour concrete to bury the connector inside the concrete.

Claims

1. A rigid connector at an assembled joint, characterized in that: The connecting piece comprises a steel joint (1) and a steel sleeve (2); the steel joint (1) comprises a regular hexagonal joint (3) and an extended steel bar insert (4); the extended steel bar insert (4) is fixedly connected to the middle of the regular hexagonal joint (3); the steel sleeve (2) comprises a steel sleeve barrel (5) and a steel sleeve base (6); the steel sleeve barrel (5) and the steel sleeve base (6) are fixedly connected; a regular hexagonal steel joint channel (7) matching the regular hexagonal joint (3) is provided inside the steel sleeve barrel (5); an exhaust hole (9) is provided on the upper part of the outer wall thereof, and a grouting hole (8) is provided on the lower part; the interior of the steel sleeve base (6) is a hollow structure; six equidistant steel joints are provided around the inner wall of the steel sleeve base (6); The isolating piece (10) has a Y-shaped cross section, and cylindrical blocking bodies (11) are provided at both ends of the upper part; the upper part of the outer wall of the steel sleeve base (6) is provided with an exhaust hole (9), and the lower part is provided with a grouting hole (8); the protruding steel bar insert (4) is fixedly connected to the protruding steel bar; the steel joint (1) is plug-connected with the steel sleeve (2); the regular hexagonal joint (3) is inserted into the steel sleeve base (6) and rotated, and its hexagonal corner fits on the cylindrical blocking body (11) of the isolating piece (10); the steel joint (1) and the steel sleeve (2) are plugged and fixedly connected by grouting; the isolating piece (10) is rotated 15 degrees below the corresponding position of the regular hexagonal channel inside the steel sleeve barrel (5); The thickness of the steel sleeve base (6) is greater than the thickness of the regular hexagonal joint (3), and the height of the isolation sheet (10) is the same as the thickness of the steel sleeve base (6).

2. The rigid connector at an assembled joint according to claim 1, characterized in that: The outer walls of the steel sleeve barrel (5) and the steel sleeve base (6) are circular, and exhaust holes (9) and grouting holes (8) are respectively provided on the left and right sides of the steel sleeve barrel (5). The outer wall of the steel sleeve base (6) is provided with six groups of exhaust holes (9) and grouting holes (8) between the isolation plates (10).

3. The construction method of a rigid connector at a fabricated joint according to claim 1, characterized in that: The steel joint (1) is welded and fixed after inserting the protruding steel bar into the protruding steel bar insert pipe (4). The steel joint (1) is inserted into the steel sleeve barrel (5) with a hexagonal channel until it is inside the steel sleeve base (6). The regular hexagonal joint (3) of the steel joint (1) is rotated 15 degrees. After the six corners of the regular hexagonal joint (3) abut against the cylindrical blocking body (11) on one side of the isolation plate (10), the rotation is stopped. After grouting is poured into the steel sleeve barrel (5) and the steel sleeve base (6), the whole is fixedly connected.

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