A method for connecting and installing vertical prefabricated components of an assembled building

Abstract

A method for connecting and installing vertical prefabricated components of an assembled building, comprising: S1, producing prefabricated wall panels, inserting a plurality of steel bars at the top of the prefabricated wall panels, providing a plurality of sleeves at the bottom thereof, providing a plurality of limiting protrusions on the steel bars, and providing a limiting mechanism in the sleeve, the limiting mechanism being assembled to enable the steel bars to be inserted into the sleeves and to prevent the steel bars from being separated from the sleeves; S2, transporting a determined number of prefabricated wall panels to a construction site; S3, casting cast-in-situ beams, pre-embedding a plurality of steel bars on the cast-in-situ beams, and providing a plurality of limiting protrusions on the steel bars; S4, laying high-strength mortar on the top of the cast-in-situ beams, hoisting the prefabricated wall panels on the high-strength mortar, so that the plurality of steel bars on the cast-in-situ beams are respectively inserted into the plurality of sleeves of the prefabricated wall panels; S5, casting the cast-in-situ beams above the prefabricated wall panels, so that the steel bars on the prefabricated wall panels pass through the cast-in-situ beams; S6, repeating steps S4 and S5 until all construction is completed; S7, cutting off the steel bars extending from the top of the uppermost cast-in-situ beam, and completing the installation.

Description

Technical Field

[0001] The present invention belongs to the field of building technology, and in particular relates to a method for connecting and installing vertical prefabricated components of an assembled building. Background Art

[0002] The practice of prefabricated construction is to prefabricate some of the components of the main structure of the project in the factory and install them on site, reducing the workload of steel bars, formwork, and concrete on the construction site, thereby achieving energy conservation and emission reduction. The components of the structure can be divided into vertical components and horizontal components. The vertical components are divided into load-bearing vertical components such as prefabricated columns and prefabricated shear walls, and non-load-bearing vertical components such as prefabricated exterior wall panels and prefabricated window sills. For non-load-bearing vertical components, the connection method basically adopts grouting sleeve joints. The installation method is to insert the upper grouting sleeve into the reserved steel bars of the lower layer, and then caulk the joints with mortar. Finally, the grouting sleeves of the vertical components are grouted. The connection process is complicated and the amount of on-site casting is large, which hinders the development of building industrialization. In addition, due to the uneven skills of workers, the construction quality of the sleeve grouting is difficult to guarantee. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for connecting and installing vertical prefabricated components of an assembled building. By cooperating with a limiting mechanism and a limiting protrusion, the pull-out resistance requirements of the prefabricated wall panels can be met, thereby eliminating the grouting construction step, reducing construction intensity, and ensuring construction quality.

[0004] The present invention is achieved through the following technical solutions:

[0005] A method for connecting and installing vertical prefabricated components of an assembled building comprises the following steps:

[0006] S1. Prefabricated wall panels are manufactured by inserting a plurality of steel bars into the top of the prefabricated wall panels. A plurality of sleeves for inserting the steel bars are provided at the bottom of the prefabricated wall panels at positions corresponding to the steel bars. A plurality of limiting protrusions are provided above the steel bars. A limiting mechanism is provided within the sleeves. The limiting mechanism is configured to allow the steel bars to be inserted into the sleeves and to cooperate with the limiting protrusions on the steel bars to prevent the steel bars from being separated from the sleeves.

[0007] S2. Determine the quantity of prefabricated wall panels and transport the determined quantity of prefabricated wall panels to the construction site;

[0008] S3. Casting a cast-in-place beam, and pre-embedding a number of steel bars at positions corresponding to the sleeves of the prefabricated wall panels on the cast-in-place beam, with a number of limiting protrusions provided on the upper portion of the steel bars;

[0009] S4. Lay high-strength mortar on the top of the cast-in-place beam at the location where it is connected to the prefabricated wall panel, then hoist the prefabricated wall panel onto the cast-in-place beam, insert the steel bars on the cast-in-place beam into the sleeves of the prefabricated wall panel, and place the prefabricated wall panel on the high-strength mortar.

[0010] S5. Casting a cast-in-place beam above the installed prefabricated wall panel, and making the upper portion of the steel bars on the prefabricated wall panel pass through the cast-in-place beam and extend above the cast-in-place beam;

[0011] S6. Repeat steps S4 and S5 until the construction of all prefabricated wall panels and cast-in-place beams is completed;

[0012] S7. Cut off the steel bars extending from the top of the uppermost cast-in-place beam and the installation is completed.

[0013] Furthermore, multiple limiting protrusions are arranged at intervals along the length direction of the steel bar, and the limiting protrusions are arranged around the steel bar. The limiting mechanism includes multiple limiting baffle groups corresponding to the multiple limiting protrusions. The limiting baffle group includes more than two limiting baffles. The limiting baffles of the same group are arranged on the inner wall of the sleeve along the circumferential direction of the sleeve. A limiting member for limiting the rotation position of the limiting baffle is provided on the inner wall of the sleeve below the limiting baffle.

[0014] Furthermore, the top of the limiting protrusion is an inclined surface.

[0015] Furthermore, a cushion layer is provided on the top of the limiting protrusion.

[0016] Furthermore, the limiting member is a stopper.

[0017] Furthermore, the limit baffle is arranged on the inner side wall of the sleeve through a hinge.

[0018] Furthermore, in the step of laying high-strength mortar at a position on the top of the cast-in-place beam for connection with the prefabricated wall panel, the thickness of the laid high-strength mortar is at least 20 mm.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows: when the prefabricated wall panel is installed on the cast-in-place beam, the steel bar above the cast-in-place beam is inserted into the corresponding sleeve, and the limiting mechanism in the sleeve cooperates with the limiting protrusion on the steel bar to prevent the steel bar from detaching from the sleeve, thereby meeting the pull-out resistance requirements of the prefabricated wall panel on the cast-in-place beam. As a result, the caulking construction can be replaced by laying high-strength mortar, and the grouting construction step in the sleeve can be eliminated, thereby simplifying the connection process and reducing the construction intensity. At the same time, the steel bar at the top of the prefabricated wall panel is connected to the cast-in-place beam above it. The weight of the cast-in-place beam can press down the prefabricated wall panel, and the position of the prefabricated wall panel is limited by the cast-in-place beams on the upper and lower sides of the prefabricated wall panel to avoid displacement of the prefabricated wall panel, making the installation of the prefabricated wall panel more stable and reliable, and ensuring the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flowchart of the steps of the method for connecting and installing vertical prefabricated components of an assembled building according to the present invention;

[0021] Figure 2 Schematic diagram of the structure of the prefabricated wall panels in the method for connecting and installing vertical prefabricated components of an assembled building according to the present invention;

[0022] Figure 3 Schematic diagram of the connection between cast-in-situ beams and prefabricated wall panels in the method for connecting and installing vertical prefabricated components of assembled buildings of the present invention;

[0023] Figure 4 for Figure 3 An enlarged schematic diagram of part A.

[0024] In the figure, 1-cast-in-place beam, 2-prefabricated wall panel, 3-rebar, 4-limiting protrusion, 5-sleeve, 6-high-strength mortar, 7-limiting baffle, 8-limiting piece, 9-hinge. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are used only to distinguish the description and should not be understood as indicating or implying relative importance.

[0028] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0030] See also Figure 1 、 Figure 2 and Figure 3 , Figure 1 This is a flowchart of the steps of the method for connecting and installing vertical prefabricated components of an assembled building according to the present invention. Figure 2 This is a schematic structural diagram of the prefabricated wall panels in the method for connecting and installing vertical prefabricated components of an assembled building according to the present invention. Figure 3 The figure is a schematic diagram of the connection between cast-in-situ beams and prefabricated wall panels in the method for connecting and installing vertical prefabricated components of an assembled building according to the present invention. The method for connecting and installing vertical prefabricated components of an assembled building comprises the following steps:

[0031] S1. Prefabricated wall panels 2 are manufactured. Several steel bars 3 are inserted into the top of the prefabricated wall panels 2. Several sleeves 5 are provided at the bottom of the prefabricated wall panels 2 at positions corresponding to the steel bars 3, and are respectively used to insert the steel bars 3. A plurality of limiting protrusions 4 are provided above the steel bars 3. A limiting mechanism is provided in the sleeves 5. The limiting mechanism is assembled to enable the steel bars 3 to be inserted into the sleeves 5 and to cooperate with the limiting protrusions 4 on the steel bars 3 to prevent the steel bars 3 from being separated from the sleeves 5.

[0032] S2. Determine the number of prefabricated wall panels 2 and transport the determined number of prefabricated wall panels 2 to the construction site;

[0033] S3, casting the cast-in-situ beam 1, and pre-embed a number of steel bars 3 at positions of the cast-in-situ beam 1 corresponding to the positions of the sleeves 5 of the prefabricated wall panels 2, and a plurality of limiting protrusions 4 are provided on the upper positions of the steel bars 3;

[0034] S4. Lay high-strength mortar 6 on the top of the cast-in-place beam 1 at the position for connecting with the prefabricated wall panel 2, then hoist the prefabricated wall panel 2 onto the cast-in-place beam 1, so that the several steel bars 3 on the cast-in-place beam 1 are respectively inserted into the several sleeves 5 of the prefabricated wall panel 2, and the prefabricated wall panel 2 is placed on the high-strength mortar 6;

[0035] S5. Cast the cast-in-place beam 1 above the installed prefabricated wall panel 2, and ensure that the upper portion of the steel bars 3 on the prefabricated wall panel 2 passes through the cast-in-place beam 1 and extends above the cast-in-place beam 1;

[0036] S6, repeating steps S4 and S5 until the construction of all prefabricated wall panels 2 and cast-in-place beams 1 is completed;

[0037] S7. Cut off the steel bars 3 extending from the top of the uppermost cast-in-place beam 1 and the installation is completed.

[0038] In step S1 above, the prefabricated wall panel 2 can be prefabricated in a factory. During actual production, the steel bars 3 and sleeves 5 can be first prepared. Then, according to design requirements, the lower portions of the steel bars 3 are inserted into the top of the prefabricated wall panel 2. The sleeves 5 are aligned with the positions of the steel bars 3 and embedded in the bottom of the prefabricated wall panel 2. During installation, the retaining mechanism within the sleeves 5 cooperates with the retaining protrusions 4 on the steel bars 3 to prevent the steel bars 3 from detaching from the sleeves 5, thus meeting the pullout resistance requirements of the prefabricated wall panel 2 on the cast-in-place beam 1. After the prefabricated wall panel 2 is completed, it is necessary to conduct a quality inspection to ensure that the prefabricated wall panel 2 meets the quality requirements.

[0039] Please refer to Figure 4 , Figure 4 for Figure 3An enlarged schematic diagram of part A of the sleeve 5. In one embodiment, a plurality of limiting protrusions 4 are arranged at intervals along the length direction of the steel bar 3, and the limiting protrusions 4 are arranged around the steel bar 3. The limiting mechanism includes a plurality of limiting baffles 7 groups corresponding to the plurality of limiting protrusions 4. The limiting baffle 7 group includes more than two limiting baffles 7. The limiting baffles 7 of the same group are arranged on the inner side wall of the sleeve 5 along the circumferential rotation of the sleeve 5. A limiting member 8 for limiting the rotation position of the limiting baffle 7 is provided on the inner side wall of the sleeve 5 below the limiting baffle 7. Under the restriction of the limiting member 8, the rotation angle of the limiting baffle 7 on the sleeve 5 is 0-90 degrees. That is, the limiting baffle 7 can be rotated downward relative to the sleeve 5 to a horizontal state to block the limiting protrusion 4, and can also be rotated upward relative to the sleeve 5 to a vertical state so that the steel bar 3 can be inserted into the sleeve 5. Specifically, when the prefabricated wall panel 2 is installed on the cast-in-place beam 1, when the steel bar 3 on the cast-in-place beam 1 is inserted from bottom to top into the sleeve 5, the limiting protrusions 4 on the steel bar 3 push the limiting baffle 7 upward to prevent the limiting baffle 7 from blocking the steel bar 3 from inserting into the sleeve 5. After the steel bar 3 is inserted into the sleeve 5, the limiting protrusions 4 pass over the corresponding limiting baffle 7. Under the action of its own weight, the limiting baffle 7 can rotate downward. Under the restriction of the limiting member 8, the limiting baffle 7 rotates to a horizontal state. At this time, the limiting baffle 7 is located below the corresponding matching limiting protrusion 4. When the steel bar 3 is separated from the sleeve 5 from top to bottom, the multiple limiting protrusions 4 on the steel bar 3 will contact their corresponding matching limiting baffle 7. The limiting baffle 7 cannot rotate downward under the restriction of the limiting member 8. Therefore, the limiting baffle 7 can prevent the limiting protrusion 4 from moving downward, thereby preventing the steel bar 3 from separating from the sleeve 5. In one embodiment, the limiting baffle 7 is set on the inner wall of the sleeve 5 via a hinge 9. The hinge 9 is used for connection, and the materials are readily available, making it easy to install. In one embodiment, the stopper 8 is a block provided on the inner sidewall of the sleeve 5. The block is in the shape of a right triangle, with one right-angled side of the block connected to the inner sidewall of the sleeve 5, and the other right-angled side being used to abut the corresponding limit stopper 7 to limit the rotational position of the limit stopper 7 on the sleeve 5.

[0040] In one embodiment, the top of the limiting protrusion 4 is a sloped surface. The slope slopes downward toward the sleeve 5, such that the top of the limiting protrusion 4 is smaller than the bottom of the limiting protrusion 4. The vertical cross-section of the limiting protrusion 4 is a right triangle, with one right-angled side of the limiting protrusion 4 connected to the inner wall of the sleeve 5, and the slope located above the other right-angled side. When the rebar 3 is then inserted into the sleeve 5, the slope of the limiting protrusion 4 contacts the limiting baffle 7, slowly lifting the limiting baffle 7.

[0041] In one embodiment, a cushion layer is provided on the top of the limiting protrusion 4 to prevent the limiting protrusion 4 from directly colliding with the limiting baffle 7 and protect the limiting protrusion 4 and the limiting baffle 7.

[0042] In step S2, the number of prefabricated wall panels 2 can be set based on the number of layers of the wall system being constructed. The number of prefabricated wall panels 2 is the same as the number of layers of the wall system being constructed. For example, if the wall system being constructed has two layers, then the number of prefabricated wall panels 2 is also two. The determined number of prefabricated wall panels 2 are then transported to the construction site for standby use. If the wall system being constructed has two layers, then two prefabricated wall panels 2 are transported to the construction site for standby use.

[0043] In the above step S3, the cast-in-place beam 1 of the first floor of the wall system is cast. The cast-in-place beam 1 serves as the cast-in-place beam 1 of the lower floor. The construction process of the cast-in-place beam 1 is: supporting the formwork, tying the steel bars 3 and pouring the concrete. The construction process is a prior art and will not be described in detail here. During the construction of the cast-in-place beam 1, since it is the cast-in-place beam 1 of the first floor, there is no prefabricated wall panel 2 installed below the cast-in-place beam 1. Therefore, according to the construction design, the connection position of the cast-in-place beam 1 and the prefabricated wall panel 2 is determined, and then a number of steel bars 3 are pre-embedded at the connection position corresponding to the positions of the several sleeves 5 of the prefabricated wall panel 2, and a plurality of limiting protrusions 4 are provided on the upper position of the steel bars 3 for connecting the cast-in-place beam 1 and the prefabricated wall panel 2.

[0044] In the above step S4, after the construction of the cast-in-place beam 1 is completed, high-strength mortar 6 is laid on the connection position of the cast-in-place beam 1 according to the construction design. The high-strength mortar 6 can be C85 high-strength mortar 6. In order to better install the prefabricated wall panel 2 on the cast-in-place beam 1, the thickness of the laid high-strength mortar 6 is at least 20 mm. The prefabricated wall panel 2 is then lifted and moved above the connection position of the cast-in-place beam 1 using a hoisting device such as a crane. The prefabricated wall panel 2 is then lowered. During the lowering process, the several steel bars 3 on the cast-in-place beam 1 are respectively inserted into the several sleeves 5 of the prefabricated wall panel 2. The limiting protrusions 4 on the steel bars 3 can push the limiting baffle 7 upward to prevent the limiting baffle 7 from blocking the steel bars 3 from being inserted into the sleeves 5. Finally, the prefabricated wall panel 2 is placed on the high-strength mortar 6 on the cast-in-place beam 1. At this time, the steel bar 3 above the cast-in-place beam 1 is completely inserted into the sleeve 5. After the limiting protrusion 4 passes over the corresponding limiting baffle 7, the limiting baffle 7 can rotate downward under the action of its own gravity. Under the restriction of the limiting member 8, the limiting baffle 7 rotates to a horizontal state. At this time, the limiting baffle 7 is located below the corresponding limiting protrusion 4. When the steel bar 3 separates from the sleeve 5 from top to bottom, the multiple limiting protrusions 4 on the steel bar 3 will contact the corresponding limiting baffle 7, and the limiting baffle 7 cannot rotate downward under the restriction of the limiting member 8. Therefore, the limiting baffle 7 can prevent the limiting protrusion 4 from moving downward, thereby preventing the steel bar 3 from separating from the sleeve 5.

[0045] In the above step S5, after the lower prefabricated wall panels 2 are installed on the cast-in-place beams 1 of the lower layer, the cast-in-place beams 1 are cast above the lower prefabricated wall panels 2. The cast-in-place beams 1 serve as the cast-in-place beams 1 of the upper layer, and the height of the cast-in-place beams 1 is less than the height of the steel bars 3 on the prefabricated wall panels 2. When casting the cast-in-place beams 1 of the upper layer, the upper positions of the steel bars 3 on the prefabricated wall panels 2 below the cast-in-place beams 1 of the upper layer will pass through the cast-in-place beams 1 of the upper layer and extend above the cast-in-place beams 1 of the upper layer, thereby obtaining a plurality of steel bars 3 vertically arranged on the cast-in-place beams 1 of the upper layer, and a plurality of limiting protrusions 4 are provided on the steel bars 3, which can be used for connecting the prefabricated wall panels 2 with the cast-in-place beams 1 of the upper layer, so there is no need to bury the steel bars 3 on the cast-in-place beams 1 of the upper layer.

[0046] In step S6, based on specific construction requirements, if the wall system has two construction layers, then the number of prefabricated wall panels 2 is two. In steps S3, S4, and S5, the construction of one layer of prefabricated wall panels 2 has been completed, but one layer is still missing. Therefore, steps S4 and S5 are repeated to hoist the prefabricated wall panels 2 onto the upper cast-in-place beams 1. After the prefabricated wall panels 2 are installed on the upper cast-in-place beams 1, the upper cast-in-place beams 1 become the new lower cast-in-place beams 1. Cast-in-place beams 1 are then cast again above the installed prefabricated wall panels 2 to form new upper cast-in-place beams 1, thereby completing the construction of the second layer of prefabricated wall panels 2 in the wall system. If the wall system has more than two layers, i.e., the number of prefabricated wall panels 2 is more than two, steps S4 and S5 are repeated until the construction of all prefabricated wall panels 2 and cast-in-place beams 1 is completed.

[0047] In the above step S7, after the top cast-in-place beam 1 is cast, the steel bars 3 of the prefabricated wall panel 2 below it will pass through the cast-in-place beam 1 and extend to the top of the cast-in-place beam 1. Therefore, it is necessary to cut off the extended steel bars 3 to complete the installation construction of the wall system.

[0048] Compared with the prior art, the beneficial effects of the present invention are as follows: when the prefabricated wall panel 2 is installed on the cast-in-place beam 1, the steel bar 3 above the cast-in-place beam 1 is inserted into the corresponding sleeve 5, and the limiting mechanism in the sleeve 5 cooperates with the limiting protrusion 4 on the steel bar 3 to prevent the steel bar 3 from detaching from the sleeve 5, thereby meeting the pull-out resistance requirements of the prefabricated wall panel 2 on the cast-in-place beam 1, thereby replacing the caulking construction with the laying of high-strength mortar 6, and eliminating the grouting construction step in the sleeve 5, simplifying the connection process construction, and reducing the construction intensity. At the same time, the steel bar 3 at the top of the prefabricated wall panel 2 is connected to the cast-in-place beam 1 above it, and the weight of the cast-in-place beam 1 can press down the prefabricated wall panel 2, and the position of the prefabricated wall panel 2 is limited by the cast-in-place beams 1 on the upper and lower sides of the prefabricated wall panel 2, thereby avoiding displacement of the prefabricated wall panel 2, making the installation of the prefabricated wall panel 2 more stable and reliable, and ensuring the construction quality.

[0049] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any simple modifications, equivalent changes, and modifications to the above embodiments based on the technical essence of the present invention that do not depart from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A method for connecting and installing vertical prefabricated components of an assembled building, characterized in that: The following steps are involved: S1. Prefabricated wall panels are manufactured, wherein a plurality of steel bars are inserted into the top of the prefabricated wall panels, and a plurality of sleeves for inserting the steel bars are provided at positions corresponding to the steel bars in the bottom of the prefabricated wall panels. A plurality of limiting protrusions are provided above the steel bars, and a limiting mechanism is provided in the sleeves. The limiting mechanism is configured to enable the steel bars to be inserted into the sleeves and to cooperate with the limiting protrusions on the steel bars to prevent the steel bars from being separated from the sleeves. S2. Determine the quantity of the prefabricated wall panels, and transport the determined quantity of the prefabricated wall panels to the construction site; S3, casting a cast-in-place beam, and pre-embedding a plurality of steel bars at positions of the cast-in-place beam corresponding to the plurality of sleeves of the prefabricated wall panels, wherein a plurality of limiting protrusions are provided on the upper portion of the steel bars; S4. Laying high-strength mortar on the top of the cast-in-place beam at a position for connecting with the prefabricated wall panel, and then hoisting the prefabricated wall panel on the cast-in-place beam so that the steel bars on the cast-in-place beam are respectively inserted into the sleeves of the prefabricated wall panel, and the prefabricated wall panel is placed on the high-strength mortar; S5, casting a cast-in-place beam above the installed prefabricated wall panel, and making the upper part of the steel bars on the prefabricated wall panel pass through the cast-in-place beam and extend above the cast-in-place beam; S6. Repeat steps S4 and S5 until the construction of all the prefabricated wall panels and cast-in-place beams is completed; S7. Cut off the steel bars extending from the top of the uppermost cast-in-place beam, and the installation is completed.

2. The method for connecting and installing vertical prefabricated components of an assembled building according to claim 1, characterized in that: The plurality of limiting protrusions are arranged at intervals along the length direction of the steel bar, and the limiting protrusions are arranged around the steel bar. The limiting mechanism includes a plurality of limiting baffle groups corresponding to the plurality of limiting protrusions. The limiting baffle group includes more than two limiting baffles. The limiting baffles of the same group are arranged on the inner side wall of the sleeve along the circumferential direction of the sleeve. A limiting member for limiting the rotation position of the limiting baffle is provided on the inner side wall of the sleeve below the limiting baffle.

3. The method for connecting and installing vertical prefabricated components of an assembled building according to claim 1, characterized in that: The top end of the limiting protrusion is an inclined surface.

4. The method for connecting and installing vertical prefabricated components of an assembled building according to claim 1, wherein: A soft cushion layer is provided on the top of the limiting protrusion.

5. The method for connecting and installing vertical prefabricated components of an assembled building according to claim 1, wherein: The limiting component is a stopper.

6. The method for connecting and installing vertical prefabricated components of an assembled building according to claim 1, characterized in that: The limit baffle is arranged on the inner side wall of the sleeve through a hinge.

7. The method for connecting and installing vertical prefabricated components of an assembled building according to claim 1, characterized in that: In the step of laying high-strength mortar at a position on the top of the cast-in-place beam for connection with the prefabricated wall panel, the thickness of the laid high-strength mortar is at least 20 mm.

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