A prefabricated structure for adding floors to existing buildings

Abstract

This application relates to a prefabricated structure for adding floors to existing buildings, belonging to the field of building technology. The prefabricated structure includes a mounting base, columns, an upper crossbeam, and a lower crossbeam. The mounting base is bolted to the top of the existing building, and a connecting column is fixedly connected to the mounting base. The bottom end of the column has a connecting groove for interlocking with the connecting column. Fixing blocks are fixedly connected to both ends of the lower crossbeam, and the bottom end of the column has a fixing groove for interlocking with the fixing blocks. The upper crossbeam is fixedly connected to the top of the columns. Multiple prefabricated wall panels are arranged between the columns, upper crossbeam, and lower crossbeam. The upper surface of the lower crossbeam has an interlocking part, and the bottom end of the prefabricated wall panel has an interlocking groove for interlocking with the interlocking part. A limiting component is provided on the connecting column to restrict the connecting groove. This application restricts the connecting groove to the connecting column, reducing the possibility of separation between the lower crossbeam and the column, thereby improving the connection strength of the entire prefabricated structure and shortening the construction period.

Description

Technical Field

[0001] This application relates to the field of building technology, and in particular to a prefabricated structure for adding floors to existing buildings. Background Technology

[0002] With the continuous increase in urban population, housing pressure in cities is becoming increasingly severe. To alleviate this pressure and increase housing capacity without demolishing existing buildings, it is common practice to add floors to existing structures. Adding floors to existing buildings involves leveling the top of the existing building and constructing new floors on top of it, thus creating new housing areas and easing housing pressure.

[0003] The existing prefabricated structure construction method involves hoisting columns, beams, and prefabricated walls to the top of the building, then fixing the columns to the top of the building with bolts, and finally fixing the beams and prefabricated walls to the columns by welding, so as to realize the assembly of the entire floor addition renovation.

[0004] However, due to the length of the columns, it is cumbersome and inefficient to erect them on the top of the building by bolting. Summary of the Invention

[0005] To effectively improve construction efficiency, this application provides a prefabricated structure for adding floors to existing buildings.

[0006] The purpose of this application is to provide a prefabricated structure for adding floors to existing buildings, which adopts the following technical solution:

[0007] A prefabricated structure for adding floors to existing buildings includes a mounting base, columns, an upper crossbeam, and a lower crossbeam. The mounting base is bolted to the top of the existing building, and a connecting column is fixedly connected to the mounting base. The bottom end of the column has a connecting groove that engages with the connecting column. Fixing blocks are fixedly connected to both ends of the lower crossbeam, and the bottom end of the column has a fixing groove that engages with the fixing blocks. The upper crossbeam is fixedly connected to the top of the columns. Multiple prefabricated wall panels are arranged between the columns, upper crossbeam, and lower crossbeam. The upper surface of the lower crossbeam has an interlocking part, and the bottom end of each prefabricated wall panel has an interlocking groove that engages with the interlocking part. The connecting column is equipped with a limiting component for confining the connecting groove to the connecting column.

[0008] By employing the above technical solution, the connecting column and connecting groove are used to fix the column to the top of the existing building; then, the fixing block and fixing groove are used to fix the lower crossbeam to the upper surface of the existing building; finally, the fitting part and fitting groove are used to fix multiple prefabricated wall panels between the column, upper crossbeam, and lower crossbeam, thus completing the frame assembly for adding floors to the existing building. By restricting the connecting groove to the connecting column using the limiting component, the possibility of the column separating from the mounting base can be reduced, thereby reducing the possibility of the lower crossbeam separating from the column, improving the connection strength of the entire prefabricated structure, and thus shortening the construction period.

[0009] Optionally, the limiting component includes a sliding groove, a limiting rod, and a limiting slot. The sliding groove is formed on the side of the connecting column, the limiting rod is slidably connected in the sliding groove, and the limiting slot is formed on the side of the column and communicates with the connecting groove. A limiting spring is provided in the sliding groove, one end of the limiting spring is fixed to the groove wall of the sliding groove, and the other end of the limiting spring is fixed to the limiting rod.

[0010] By adopting the above technical solution, when the limiting rod is aligned with the limiting groove, the end of the limiting rod will be inserted into the limiting groove under the action of the limiting spring, thereby achieving the purpose of limiting the connecting groove to the connecting post.

[0011] Optionally, the end face of the limiting rod away from the limiting spring is an inclined surface, and the inclined surface of the limiting rod is set away from the mounting base.

[0012] By adopting the above technical solution, during the process of fixing the column on the mounting base, the bottom end of the column will press against the inclined surface of the limiting rod, so that the end of the limiting rod retracts into the sliding groove, which makes it easier to fit the connecting groove of the column onto the outside of the connecting column, thereby improving the assembly speed of the entire structure.

[0013] Optionally, the bottom surface of the column is provided with an anti-detachment groove, which is engaged with the bolts on the mounting base.

[0014] By adopting the above technical solution, and using the anti-detachment groove in conjunction with the bolt, the possibility of the bolt falling off the mounting base can be reduced, thereby making the column more stable when fixed to the top of the existing building.

[0015] Optionally, a sealing gasket is provided on the lower surface of the lower crossbeam, and the sealing gasket presses against the upper surface of the existing building.

[0016] By adopting the above technical solution, when the lower beam is fixed between adjacent columns, the sealing gasket is pressed between the lower beam and the existing building, which can increase the sealing between the lower beam and the existing building, thereby reducing the amount of rainwater entering the building from between the lower beam and the existing building.

[0017] Optionally, the fitting part includes a guide strip and a movable strip. The guide strip is fixedly connected to the upper surface of the lower crossbeam. A recessed groove is formed on the upper surface of the lower crossbeam. A sliding block is slidably connected in the recessed groove along the vertical direction. The movable strip is fixedly connected to the sliding block. A return spring is provided in the recessed groove. One end of the return spring is fixedly connected to the bottom of the recessed groove, and the other end of the return spring is fixedly connected to the sliding block. When the return spring is in its natural state, one end of the guide strip abuts against the side of a column, and the other end of the guide strip abuts against one end of the movable strip. The other end of the movable strip abuts against the side of an adjacent column. The length of the movable strip is greater than the length of the precast wall.

[0018] By adopting the above technical solution, when assembling the precast wall, the movable strip is pressed against the guide strip, causing it to retract into the recessed groove. Then, the precast wall is pushed along the direction of the guide strip, causing the fitting groove of the precast wall to slide on the guide strip, thereby completing the installation of the precast wall on the guide strip. During the installation of the precast wall on the movable strip, when the movable strip is aligned with the fitting groove of the precast wall, the movable strip will be inserted into the fitting groove of the precast wall under the action of the return spring, which can reduce the amount of rainwater entering the building from between the lower beam and the precast wall.

[0019] Optionally, a grouting hole is provided on the inner side of the lower crossbeam, and the grouting hole is connected to the recessed groove; a plug rod is slidably connected in the grouting hole, and a plug groove is provided on the side of the sliding block to engage with the plug rod.

[0020] By adopting the above technical solution, the movable strip can be confined within the recessed groove by using the interlocking rod and the interlocking groove, thus preventing the movable strip from affecting the installation of the precast wall. After the precast wall between two adjacent columns is installed, the interlocking rod is pulled out to allow the movable strip to be inserted into the fitting groove. Concrete or sealant can be injected into the recessed groove through the grouting hole to further enhance the sealing between the precast wall and the lower beam.

[0021] Optionally, the cross-sections of the guide strip and the movable strip are isosceles trapezoids.

[0022] By adopting the above technical solution, the shape setting of the guide strip and the movable strip can enhance the sealing between the precast wall and the lower beam.

[0023] Optionally, the sides of two adjacent prefabricated wall sections are attached to each other. A first protruding strip is fixedly connected to one side of one prefabricated wall section in the vertical direction, and a second protruding strip is fixedly connected to one side of the other prefabricated wall section in the vertical direction. The second protruding strip abuts against the first protruding strip, and the second protruding strip is located on the side of the first protruding strip facing the interior of the building.

[0024] By adopting the above technical solution, the cooperation of the first and second protruding strips can increase the sealing between two adjacent prefabricated walls and reduce the amount of rainwater entering the building from between the two adjacent prefabricated walls.

[0025] Optionally, a first water-blocking strip is fixedly connected to the lower surface of the upper crossbeam. The first water-blocking strip is arranged along the length direction of the upper crossbeam and abuts against the outer surface of the precast wall. A second water-blocking strip is fixedly connected to the side of the column. The second water-blocking strip is arranged along the height direction of the column and abuts against the outer surface of the precast wall.

[0026] By adopting the above technical solution, and utilizing the first and second water-blocking strips, it is possible to reduce the amount of rainwater entering the building from between the precast wall and the upper beam, and between the precast wall and the column.

[0027] In summary, this application includes at least the following beneficial technical effects:

[0028] 1. By using connecting columns and connecting slots, the columns are fixedly connected to the top of the existing building; then, using fixing blocks and fixing slots, the lower crossbeams are fixedly connected to the upper surface of the existing building; finally, using fitting parts and fitting slots, multiple prefabricated wall panels are fixedly connected between the columns, upper crossbeams, and lower crossbeams, thus completing the frame assembly for adding floors to the existing building. By using limiting components to restrict the connecting slots to the connecting columns, the possibility of separation between the columns and mounting bases can be reduced, thereby reducing the possibility of separation between the lower crossbeams and columns, improving the connection strength of the entire prefabricated structure, and thus shortening the construction period.

[0029] 2. When assembling the precast wall, the movable strip is pressed against the guide strip, causing it to retract into the recessed groove. Then, the precast wall is pushed along the direction of the guide strip, causing the fitting groove of the precast wall to slide on the guide strip, thus completing the installation of the precast wall on the guide strip. During the installation of the precast wall on the movable strip, when the movable strip is aligned with the fitting groove of the precast wall, the movable strip will be inserted into the fitting groove of the precast wall under the action of the return spring, which can reduce the amount of rainwater entering the building from between the lower beam and the precast wall. Attached Figure Description

[0030] Figure 1 This is a structural schematic diagram of a prefabricated structure for adding floors to an existing building, as described in an embodiment of this application.

[0031] Figure 2 This is a partial exploded view of an embodiment of this application, mainly used to show the structural schematic diagram of the column and the base;

[0032] Figure 3 This is a partial structural cross-sectional view of an embodiment of this application, mainly used to show the connection diagram of the column, base and limiting components;

[0033] Figure 4 This is a partial structural schematic diagram of an embodiment of this application, mainly used to show the connection diagram of the lower crossbeam, prefabricated wall and fitting part;

[0034] Figure 5 This is a partial structural cross-sectional view of an embodiment of this application, mainly used to show the connection diagram of the lower crossbeam, movable strip and plug rod;

[0035] Figure 6 This is a partial structural cross-sectional view of an embodiment of this application, mainly used to show a schematic diagram of the connection between adjacent prefabricated walls.

[0036] Explanation of reference numerals in the attached drawings: 1. Mounting base; 2. Column; 3. Upper crossbeam; 4. Lower crossbeam; 5. Connecting column; 6. Connecting groove; 7. Fixing block; 8. Fixing groove; 9. Precast wall; 10. Fitting part; 101. Guide strip; 102. Movable strip; 11. Fitting groove; 12. Restricting component; 121. Sliding groove; 122. Restricting rod; 123. Restricting groove; 124. Restricting spring; 13. Anti-detachment groove; 14. Sealing gasket; 15. Recessed groove; 16. Sliding block; 17. Return spring; 18. Grouting hole; 19. Insertion rod; 20. Insertion groove; 21. First protrusion; 22. Second protrusion; 23. First water-blocking strip; 24. Second water-blocking strip. Detailed Implementation

[0037] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figure 1-6 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0038] This application discloses a prefabricated structure for adding floors to existing buildings. (Refer to...) Figure 1 and Figure 2 The prefabricated structure includes a mounting base 1 and a column 2. The mounting base 1 is bolted to the top of the existing building. Each of the four corners of the mounting base 1 has through holes to allow bolts to pass through and be fixed into the reinforced concrete of the existing building. A connecting column 5, which is cylindrical, is fixedly connected to the upper surface of the mounting base 1. The bottom end of the column 2 has a connecting groove 6, which is inserted into the connecting column 5. Furthermore, the mounting base 1 and the connecting column 5 are integrally cast from stainless steel; the column 2 is also made of stainless steel, and the connecting groove 6 is pre-drilled during the casting of the column 2.

[0039] Reference Figure 2 and Figure 3To reduce the risk of the column 2 detaching from the mounting base 1, a limiting component 12 is installed on the connecting column 5. The limiting component 12 includes a sliding groove 121, a limiting rod 122, and a limiting groove 123. The sliding groove 121 is located on the side of the connecting column 5, and the limiting rod 122 is slidably connected within the sliding groove 121. The limiting groove 123 is located on the side of the column 2 and communicates with the connecting groove 6. A limiting spring 124 is installed within the sliding groove 121. One end of the limiting spring 124 is fixed to the groove wall of the sliding groove 121, and the other end is fixed to the limiting rod 122. When the limiting rod 122 is aligned with the limiting groove 123, the end of the limiting rod 122 will insert into the limiting groove 123 under the action of the limiting spring 124, thereby limiting the connecting groove 6 to the connecting column 5.

[0040] Reference Figure 2 and Figure 3 To increase the speed at which the column 2 is fixed to the mounting base 1, the end face of the limiting rod 122 away from the limiting spring 124 is inclined, and the inclined surface of the limiting rod 122 is set away from the mounting base 1. During the process of fixing the column 2 to the mounting base 1, the bottom end of the column 2 will press against the inclined surface of the limiting rod 122, causing the end of the limiting rod 122 to retract into the sliding groove 121, which facilitates the connection groove 6 of the column 2 to be sleeved on the outside of the connecting column 5, thereby improving the assembly speed of the entire structure.

[0041] Reference Figure 2 and Figure 3 To ensure a more secure fixation of the column 2 to the top of the existing building, an anti-detachment groove 13 is provided on the bottom surface of the column 2. The anti-detachment groove 13 engages with the bolts on the mounting base 1. There are four anti-detachment grooves 13, and the shape of the anti-detachment groove 13 is the same as the part of the bolt protruding from the mounting base 1. By engaging with the bolts, the possibility of the bolts falling off the mounting base 1 can be reduced, thus making the column 2 more securely fixed to the top of the existing building.

[0042] Reference Figure 1 and Figure 4 The prefabricated structure also includes a lower crossbeam 4 and an upper crossbeam 3. The lower crossbeam 4 has fixing blocks 7 fixedly connected to both ends, and the bottom end of the column 2 has a fixing groove 8, which is inserted into the fixing block 7. The upper crossbeam 3 is fixedly connected to the tops of two adjacent columns 2 by welding. The lower crossbeam 4 and fixing blocks 7 are integrally cast from stainless steel, and the upper crossbeam 3 is also made of stainless steel. Through the cooperation of the fixing blocks 7 and fixing grooves 8, the lower crossbeam 4 can be fixedly connected to the upper surface of the existing building, thus connecting the column 2, mounting base 1, and lower crossbeam 4 into a single unit.

[0043] Reference Figure 1 and Figure 4The prefabricated structure also includes multiple prefabricated wall panels 9, located between the column 2, upper beam 3, and lower beam 4, with the sides of adjacent prefabricated wall panels 9 fitting together. A first water-blocking strip 23 is fixedly connected to the lower surface of the upper beam 3, extending along its length and abutting against the outer surface of the prefabricated wall panel 9. A second water-blocking strip 24 is fixedly connected to the side of the column 2, extending along its height and abutting against the outer surface of the prefabricated wall panel 9. The upper beam 3 and the first water-blocking strip 23 are integrally cast from stainless steel, as are the column 2 and the second water-blocking strip 24. The prefabricated wall panels 9 are made of reinforced concrete. The first water-blocking strip 23 and the second water-blocking strip 24 reduce the amount of rainwater entering the building from between the prefabricated wall panel 9 and the upper beam 3, and between the prefabricated wall panel 9 and the column 2.

[0044] Reference Figure 1 and Figure 4 To reduce rainwater ingress into the building through the gap between the lower beam 4 and the existing structure, a sealing gasket 14 is fixed to the lower surface of the lower beam 4 with strong adhesive. The sealing gasket 14 presses against the upper surface of the existing structure. When the lower beam 4 is fixed between adjacent columns 2, pressing the sealing gasket 14 against the gap between the lower beam 4 and the existing structure increases the airtightness between them, thereby reducing rainwater ingress into the building through the gap between the lower beam 4 and the existing structure.

[0045] Reference Figure 4 and Figure 5 In order to reduce rainwater from entering the building between the lower beam 4 and the precast wall 9, a fitting part 10 is installed on the upper surface of the lower beam 4, and a fitting groove 11 is opened at the bottom of the precast wall 9. The fitting groove 11 and the fitting part 10 are inserted and matched. The fitting part 10 includes a guide bar 101 and a movable bar 102. The guide bar 101 is fixedly connected to the upper surface of the lower crossbeam 4. A recessed groove 15 is formed on the upper surface of the lower crossbeam 4. A sliding block 16 is slidably connected in the recessed groove 15 along the vertical direction. The movable bar 102 is fixedly connected to the sliding block 16. A return spring 17 is installed in the recessed groove 15. One end of the return spring 17 is fixedly connected to the bottom of the recessed groove 15, and the other end of the return spring 17 is fixedly connected to the sliding block 16. When the return spring 17 is in its natural state, one end of the guide bar 101 abuts against the side of a column 2, and the other end of the guide bar 101 abuts against one end of the movable bar 102. The other end of the movable bar 102 abuts against the side of an adjacent column 2. The length of the movable bar 102 is greater than the length of the precast wall 9.

[0046] In this embodiment, the lower crossbeam 4 and guide bar 101 are integrally cast from stainless steel, and the movable bar 102 and sliding block 16 are integrally cast from stainless steel. The two ends of the return spring 17 are welded to the bottom of the recessed groove 15 and the sliding block 16, respectively. When assembling the precast wall 9, the movable bar 102 is pressed against it, causing it to retract into the recessed groove 15. Then, the precast wall 9 is pushed along the direction of the guide bar 101, causing the fitting groove 11 of the precast wall 9 to slide on the guide bar 101, thereby completing the installation of the precast wall 9 on the guide bar 101. During the installation of the precast wall 9 on the movable bar 102, when the movable bar 102 is aligned with the fitting groove 11 of the precast wall 9, the movable bar 102 will be inserted into the fitting groove 11 of the precast wall 9 under the action of the return spring 17, which can reduce the amount of rainwater entering the building from between the lower crossbeam 4 and the precast wall 9.

[0047] Reference Figure 4 and Figure 5 The lower crossbeam 4 has a grouting hole 18 on its inner side, which is connected to the recessed groove 15. A plug-in rod 19 is slidably connected inside the grouting hole 18, and a plug-in groove 20 is provided on the side of the sliding block 16. The plug-in groove 20 is engaged with the plug-in rod 19. The guide strip 101 and the movable strip 102 have isosceles trapezoidal cross sections. The grouting hole 18 is located on the side of the lower crossbeam 4 facing the interior of the building. Through the engagement of the plug-in rod 19 and the plug-in groove 20, the movable strip 102 can be confined within the recessed groove 15, preventing the presence of the movable strip 102 from affecting the installation of the precast wall 9. After the precast wall 9 between two adjacent columns 2 is installed, the plug-in rod 19 is pulled out so that the movable strip 102 can be inserted into the fitting groove 11. Concrete or sealant can be injected into the recessed groove 15 through the grouting hole 18 to further enhance the sealing between the precast wall 9 and the lower crossbeam 4.

[0048] Reference Figure 4 and Figure 6 To reduce rainwater ingress between adjacent prefabricated wall panels 9, the sides of the two adjacent prefabricated wall panels 9 are fitted together. A first protruding strip 21 is fixedly connected vertically to one side of one prefabricated wall panel 9, and a second protruding strip 22 is fixedly connected vertically to one side of the other prefabricated wall panel 9. The second protruding strip 22 abuts against the first protruding strip 21, and is located on the side of the first protruding strip 21 facing inwards. The prefabricated wall panels 9, the first protruding strip 21, and the second protruding strip 22 are all constructed of reinforced concrete. The cooperation of the first protruding strip 21 and the second protruding strip 22 increases the airtightness between the two adjacent prefabricated wall panels 9, thus reducing rainwater ingress between them.

[0049] The implementation principle of a prefabricated structure for adding floors to an existing building according to the embodiments of this application is as follows: Based on the design drawings for the floor addition, mounting base 1 is fixed to the top of the existing building using bolts. Fixing blocks 7 at both ends of the lower crossbeam 4 are placed on two adjacent mounting bases 1. Then, the connecting groove 6 of the column 2 is fitted onto the connecting column 5, so that the anti-detachment groove 13 on the column 2 is fitted onto the bolt, and the fixing groove 8 on the column 2 is fitted onto the fixing block 7. When the limiting rod 122 is aligned with the limiting groove 123, the end of the limiting rod 122 will be inserted into the limiting groove 123 under the action of the limiting spring 124, thereby fixing the column 2 to the mounting base 1.

[0050] Press down on the movable strip 102 to align the grouting hole 18 with the insertion slot 20, and push the insertion rod 19 inward so that the end of the insertion rod 19 is inserted into the insertion slot 20, which helps to confine the movable strip 102 within the recessed groove 15. Insert the precast wall 9 from the movable strip 102 of the upper beam 3, and then push the precast wall 9 along the direction of the guide strip 101 so that the fitting groove 11 of the precast wall 9 slides on the guide strip 101, thus completing the installation of multiple precast wall pieces 9 between the two columns 2. Pull out the insertion rod 19 so that the movable strip 102 is inserted into the fitting groove 11 of the corresponding precast wall 9 under the action of the return spring 17, and then inject concrete or sealant into the recessed groove 15 through the grouting hole 18 to enhance the sealing between the precast wall 9 and the lower beam 4. Finally, weld and fix the two upper beams 3 to the top of the two adjacent columns 2 to complete the assembly of the entire addition renovation.

[0051] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fabricated structure for retrofitting an existing building with additional stories, characterized by, The utility model provides a kind of prefabricated wall installation structure, including mounting seat (1), stand (2), upper crossbeam (3) and lower crossbeam (4), the mounting seat (1) is bolted to the top of existing building, the mounting seat (1) is fixedly connected with connecting column (5), the bottom end of the stand (2) is equipped with the connecting slot (6) of being inserted with connecting column (5) cooperation, the both ends of the lower crossbeam (4) are fixedly connected with fixed block (7), the bottom end of the stand (2) is equipped with the fixed slot (8) of being inserted with fixed block (7) cooperation, the upper crossbeam (3) is fixedly connected to the top end of stand (2), and the stand (2), upper crossbeam (3) and lower crossbeam (4) are provided with multiple prefabricated wall body (9) between, the upper surface of the lower crossbeam (4) is provided with inlay part (10), and the bottom end of the prefabricated wall body (9) is equipped with the inlay slot (11) of being inserted with inlay part (10) cooperation, and the connecting column (5) is provided with the limiting component (12) for limiting connecting slot (6) on connecting column (5) on the connecting column (5). The inlay part (10) includes guide strip (101) and movable strip (102), the guide strip (101) is fixedly connected to the upper surface of lower crossbeam (4), the upper surface of lower crossbeam (4) is equipped with recessed groove (15), the recessed groove (15) is slidably connected with sliding block (16) in vertical direction, and the movable strip (102) is fixedly connected to sliding block (16), the recessed groove (15) is provided with reset spring (17), one end of reset spring (17) is fixedly connected to the groove bottom of recessed groove (15), the other end of reset spring (17) is fixedly connected to sliding block (16), when the natural state of reset spring (17), one end of guide strip (101) is abutted to the side surface of a stand (2), the other end of guide strip (101) is abutted to one end of movable strip (102), the other end of movable strip (102) is abutted to the side surface of adjacent stand (2), and the length of movable strip (102) is greater than the length of prefabricated wall body (9).

2. The fabricated structure for adding a floor to a reconstructed existing building according to claim 1, wherein The limiting component (12) includes sliding slot (121), limiting rod (122) and limiting slot (123), the sliding slot (121) is equipped in the side surface of connecting column (5), the limiting rod (122) is slidably connected in sliding slot (121), the limiting slot (123) is equipped in the side surface of stand (2), and the limiting slot (123) is communicated with connecting slot (6), the sliding slot (121) is provided with limiting spring (124), one end of limiting spring (124) is fixed to the groove wall of sliding slot (121), and the other end of limiting spring (124) is fixed to limiting rod (122).

3. The fabricated structure for adding a floor to a reconstructed existing building according to claim 2, wherein The end face of limiting rod (122) away from limiting spring (124) is inclined surface, and the inclined surface of limiting rod (122) is arranged away from mounting seat (1).

4. The fabricated structure for adding a floor to a reconstructed existing building according to claim 1, wherein The bottom surface of stand (2) is equipped with anti-drop slot (13), and the anti-drop slot (13) is inserted with the bolt on mounting seat (1) cooperation.

5. The fabricated structure for adding a floor to a reconstructed existing building according to claim 1, wherein The lower surface of the lower cross beam (4) is provided with a sealing gasket (14) which is pressed against the upper surface of the existing building.

6. The fabricated structure for adding a floor to a reconstructed existing building according to claim 1, wherein The inner side of the lower cross beam (4) is provided with a grouting hole (18) which is communicated with the recessed groove (15); the grouting hole (18) is slidably connected with a plug-in rod (19); the side surface of the sliding block (16) is provided with a plug-in groove (20) which is plugged with the plug-in rod (19).

7. The fabricated structure for adding a floor to a reconstructed existing building according to claim 1, wherein The cross section of the guide strip (101) and the movable strip (102) is isosceles trapezoidal.

8. The fabricated structure for adding a floor to a reconstructed existing building according to claim 1, wherein The side surfaces of two adjacent precast wall bodies (9) are abutted; one side surface of one precast wall body (9) is fixedly connected with a first convex strip (21) in the vertical direction; one side surface of another precast wall body (9) is fixedly connected with a second convex strip (22) in the vertical direction; the second convex strip (22) is abutted with the first convex strip (21); and the second convex strip (22) is located on the side of the first convex strip (21) which faces the interior of the building.

9. The fabricated structure for adding a floor to a reconstructed existing building according to claim 1, wherein The lower surface of the upper cross beam (3) is fixedly connected with a first water retaining strip (23); the first water retaining strip (23) is arranged along the length direction of the upper cross beam (3); and the first water retaining strip (23) is abutted with the outer surface of the precast wall body (9); the side surface of the stand column (2) is fixedly connected with a second water retaining strip (24); the second water retaining strip (24) is arranged along the height direction of the stand column (2); and the second water retaining strip (24) is abutted with the outer surface of the precast wall body (9).

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