Prefabricated vertical component bottom connecting device and construction method

Abstract

The invention relates to the technical field of fabricated structures, in particular to a prefabricated vertical component bottom connecting device and a construction method. A hollow box-shaped structure is arranged at the middle upper part of the connecting device, and one side of the connecting device is exposed to form a groove; a threaded connection end is arranged at the upper part of the box-shaped structure and is in threaded connection with a vertical reinforcing steel bar in the prefabricated vertical component; a barrel is arranged at the lower part of the box-shaped structure, and a spiral rib surrounds the periphery of the barrel; the top of the lower component is vertically provided with a vertical connecting rib, penetrates through the cylinder and is inserted into the inner cavity of the box-shaped structure for a certain length during installation, the vertical connecting rib is fixed in the groove through bolt connection, grouting materials are injected into gaps of the inner cavity of the cylinder in the later period, and the grouting materials are hardened to form a whole. According to the invention, the structure is reasonable, the connection is reliable, the on-site installation speed of vertical members such as prefabricated walls and columns can be greatly improved, an inclined support is omitted, the construction cost is greatly reduced, the vertical tension and compression force transmission and horizontal shear resistance of the vertical steel bars can be realized, and the anti-seismic property and the structural safety of a fabricated building can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of assembled structures, and in particular to a bottom connection device for a prefabricated vertical component and a construction method. Background Art

[0002] In prefabricated structures, the connection between prefabricated vertical components is the key to ensuring the seismic performance and structural safety of prefabricated structures. How to achieve reliable connection between prefabricated vertical components while facilitating component production and installation, speeding up on-site construction, and reducing construction costs has always been a key and difficult issue that the industry has been paying attention to.

[0003] In some parts of Europe and the United States, where seismic fortification requirements are low, boot-type connectors are often used for dry connection between the bottom of prefabricated vertical components and the components below. That is, a hole is opened at the bottom of the boot-type connector, and bolted to the vertical connecting ribs extending from the components below. Vertical anchor ribs are provided on the top of the boot-type connector, which are overlapped and connected to the vertical steel bars inside the component, so that the prefabricated vertical components can be quickly installed and fixed. However, this dry connection method has several key technical problems that need to be solved: First, the diameter of the opening at the bottom of the boot-type connector is larger than the diameter of the vertical connecting bar, and the gap formed makes the upper part of the vertical connecting bar lack horizontal constraints, and the horizontal shearing effect of the vertical connecting bar cannot be fully exerted. The shearing resistance between the prefabricated vertical component and the lower component is basically provided by the upper and lower friction surfaces of the horizontal gap filling layer between the components. When encountering a large earthquake, a certain degree of horizontal slip will occur, which is not conducive to earthquake resistance and affects the safety performance of the structure; second, the bolt connection method at the bottom of the boot-type connector can basically only transmit the axial tension of the vertical steel bar. However, when the actual reinforced concrete structure is under compression, due to the greater stiffness and elastic modulus of the steel bar, the vertical steel bar often bears and transmits part of the pressure, but the above-mentioned bolt connection method cannot effectively transmit the axial pressure of the vertical steel bar, which invisibly reduces the compressive performance of the prefabricated vertical component and reduces the safety reserve of the structure; third, the steel bar lap connection method at the upper part of the boot-type connector will cause a large degree of waste of steel bar materials, and the force transmission performance is not direct and reliable enough. The above problems have largely limited the application of this dry connection method in prefabricated structures in earthquake-resistant areas in my country, and have been unable to give full play to the advantages of rapid prefabricated construction, which has greatly affected the development of prefabricated buildings in my country. Summary of the invention

[0004] In view of the above-mentioned technical problems, the purpose of the present invention is to provide a prefabricated vertical component bottom connection device and construction method, which has a reasonable structure and reliable connection, can greatly improve the on-site installation speed of prefabricated wall and column vertical components, eliminate inclined supports, and significantly reduce construction costs. It can also realize the vertical tension and compression force transmission and horizontal shear resistance of vertical steel bars, which is beneficial to ensuring the seismic performance and structural safety of prefabricated buildings.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A prefabricated vertical component bottom connection device, the upper part of the connection device is provided with a hollow box-like structure, one side of the box-like structure is exposed to form a groove; the upper part of the box-like structure is provided with a threaded connection end, and the threaded connection end is connected to the vertical steel bar inside the prefabricated vertical component through a thread; the lower part of the box-like structure is provided with a cylinder, and the outer circumference of the cylinder is surrounded by spiral bars; the top of the lower component is vertically provided with a vertical connection bar with a thread on the upper end, during installation, the upper end of the vertical connection bar passes through the inner cavity of the cylinder and is inserted into the inner cavity of the box-like structure, and the upper end of the vertical connection bar is fixed by a matching pad and nut, the bottom of the inner cavity groove of the box-like structure is a grouting pool, and fan-shaped holes connecting the grouting pool and the inner cavity of the cylinder are evenly arranged on the pad, and the gap between the vertical connection bar and the inner cavity of the cylinder is connected and fixed by filling grouting material.

[0007] The bottom connection device of the prefabricated vertical component has a truncated cone-shaped threaded connection end at the upper part of the box-like structure, and vertical threaded holes are provided at the center of the threaded connection end and at the corresponding position of the top plate of the box-like structure. The threaded holes match the threads at the ends of the vertical steel bars inside the prefabricated vertical component.

[0008] The bottom connecting device of the prefabricated vertical component has a box-like structure with a cylinder at the bottom, and the inner cavity of the cylinder is provided with annular or spiral ribs at intervals, and the height of the ribs is 1 to 3 mm. A rubber sealing ring is installed at the bottom of the cylinder, and the sealing ring is tightly fitted and fixed to the inner cavity of the cylinder. The diameter of the opening in the middle of the sealing ring is 3 to 5 mm smaller than the diameter of the lower vertical connecting rib.

[0009] The prefabricated vertical component bottom connection device has spiral ribs around the outer periphery of the cylinder, the top of the spiral ribs is welded and fixed to the bottom of the box-shaped structure, the bottom of the spiral ribs is flush with the bottom of the cylinder, and the plane projection diameter of the spiral ribs is 20 to 50 mm larger than the outer diameter of the cylinder.

[0010] The bottom connection device of the prefabricated vertical component is provided with a pad or a leveling bolt at the top of the lower component, and a seat mortar is laid on the top of the lower component so that the seat mortar is filled between the bottom of the prefabricated vertical component and the top of the lower component.

[0011] In the prefabricated vertical component bottom connection device, the center of the threaded connection end and the center of the cylinder are on the same vertical axis, and the threaded connection end, the cylinder and the box-like structure are integrally formed by casting, or the threaded connection end, the cylinder and the box-like structure are formed as a whole by steel plate welding or mechanical connection.

[0012] The bottom connection device of the prefabricated vertical component has a circular ring-shaped pad with a thickness of 5 to 10 mm and an outer diameter 10 to 20 mm larger than the inner diameter of the cylinder. The diameter of the hole in the middle of the pad is 3 to 5 mm larger than the diameter of the vertical connecting rib. The pad has no less than four narrow fan-shaped holes radially distributed along the plate surface, which are used as upper grouting holes and exhaust holes of the cylinder.

[0013] The bottom connection device of the prefabricated vertical component is a box-like structure composed of a top plate, a bottom plate and wall panels on three sides when the bottom of the prefabricated vertical component is connected to the lower component through a single vertical connecting rib. One side of the box-like structure is opened and exposed to form a groove as a connection operation space. A reverse edge is provided at the lower edge of the opening at the end of the groove. The height of the reverse edge is 10 to 20 mm, and a grouting pool is formed at the bottom of the groove through the reverse edge. No less than two vertical anchor bars are welded on the outer sides of the wall panels on the left and right sides of the box-like structure, and the stiffening ribs of the wall panels are formed at the same time. The length of the anchor bars extending out of the wall panels is 50 to 150 mm.

[0014] The bottom connecting device of the prefabricated vertical component is a box-like structure composed of a top plate, a bottom plate, wall panels on both sides and a partition in the middle when the bottom of the prefabricated vertical component is connected to the lower component through two vertical connecting ribs. The partition is located between the two wall panels and is vertically connected to the wall panels. The two side openings of the box-like structure are exposed to form two grooves as a connection operation space. A reverse edge is provided at the lower edge of the opening at the end of each groove. The height of the reverse edge is 10 to 20 mm, and a grouting pool is formed at the bottom of the groove through the reverse edge. No less than three vertical anchor ribs are welded on the outer side of the wall panels on the right side of the box-like structure, and the length of the anchor ribs extending out of the wall panels is 50 to 150 mm.

[0015] The construction method of the bottom connection device of the prefabricated vertical component is to use the connection device to connect the vertical steel bars between the bottom of the prefabricated wall or column vertical component and the lower component, and comprises the following steps:

[0016] (1) During factory production, the ends of the vertical steel bars inside the component are threaded and connected and fixed with the threaded connection ends at the top of the connection device. The steel bar cage is tied and placed in a mold, and concrete is poured to form a prefabricated vertical component with a bottom connection device.

[0017] (2) During on-site construction, vertical connecting bars with threads on the upper end are vertically set on the top of the lower component, and pads or leveling bolts are provided, and seat slurry is laid;

[0018] (3) The upper prefabricated vertical components are hoisted and lowered in sequence, the cylinder of the bottom connection device of the prefabricated vertical component is inserted into the vertical connection ribs on the top of the lower component, the vertical connection ribs pass through the cylinder and are inserted into the inner cavity of the box-like structure for a certain length, and the vertical connection ribs are fixed in the exposed groove of the box-like structure with a pad and a nut;

[0019] (4) In the later stage, grouting material is injected into the grouting pool at the bottom of the box-shaped structure groove, and the grouting material flows into and completely fills the inner cavity of the cylinder through the fan-shaped holes of the pad, and forms a whole after hardening;

[0020] (5) Seal the groove of the box-shaped structure with dry hard mortar and smooth it with the outer surface of the prefabricated vertical component.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] 1. The prefabricated vertical components of the present invention can be quickly fixed on the top of the lower components by bolt connection through the connecting device. No additional inclined support is required during construction, which can speed up the on-site installation speed and greatly reduce the construction cost. After all the prefabricated components are installed in the later stage, grouting is carried out in the cylinder, and after hardening, it forms an integral body, which can realize the vertical tension and compression force transmission and horizontal shear resistance of the vertical connecting ribs, which is beneficial to ensure the seismic performance and structural safety of the prefabricated building.

[0023] 2. The top of the connecting device of the present invention is connected and fixed to the vertical steel bars inside the prefabricated vertical component through a threaded connection end, and the force transmission of the steel bars is more direct and reliable. The part of the threaded connection end protruding from the top plate of the box-like structure is in a truncated cone shape, which can achieve a uniform transition of force transmission between the vertical steel bars and the top plate of the box-like structure, avoiding the phenomenon of stress concentration causing breakage or falling off of the threaded connection end, which is beneficial to ensuring the quality of the threaded connection.

[0024] 3. The left and right side wall panels of the box-like structure of the present invention are welded with vertical anchor bars, which can effectively improve the rigidity of the wall panels on both sides of the box-like structure, ensure that the box-like structure does not deform when subjected to large tension or pressure, which will affect the connection performance, and at the same time increase the anchoring performance of the box-like structure in concrete. The spiral bars surrounding the outer periphery of the cylinder can effectively constrain the concrete on the outer periphery of the cylinder, avoid separation or peeling of the concrete from the outer wall of the cylinder during tension and compression, and increase the anchoring performance of the cylinder in the concrete. Thereby, the purpose of improving the connection quality between the prefabricated vertical components and the components below is achieved, ensuring the seismic performance and structural safety of the prefabricated building, shortening the construction period, and reducing the construction cost is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the single reinforcement connection device of the present invention.

[0026] Figure 2 It is a front view of the bottom of the prefabricated vertical component of the present invention being connected to the single reinforcement of the component below.

[0027] Figure 3 It is a side view of the bottom of the prefabricated vertical component of the present invention being connected to the single reinforcement of the component below.

[0028] Figure 4 It is a top view of the bottom of the prefabricated vertical component of the present invention being connected to the single reinforcement of the component below.

[0029] Figure 5 It is a three-dimensional schematic diagram of the double-reinforcement connection device of the present invention.

[0030] Figure 6 It is a side view of the double reinforcement connection between the bottom of the prefabricated vertical component of the present invention and the component below.

[0031] Figure 7 It is a top view of the bottom of the prefabricated vertical component of the present invention being connected with double reinforcement of the component below.

[0032] In the figure: 1. connecting device, 2. box-like structure, 2-1. top plate, 2-2. bottom plate, 2-3. wall plate, 2-4. reverse edge, 2-5. partition, 3. threaded connection end, 3-1. threaded hole, 4. prefabricated vertical component, 5. vertical steel bar, 6. thread, 7. cylinder, 7-1. convex rib, 8. sealing ring, 9. vertical connecting rib, 10. spiral rib, 11. lower component, 12. pad, 13. nut, 14. grouting material, 15. grouting pool, 16. anchoring rib, 17. seat grout, 18. fan-shaped hole. DETAILED DESCRIPTION

[0033] like Figure 1 to Figure 7As shown, the present invention proposes a prefabricated vertical component bottom connection device, a steel connection device 1 is buried at the bottom of the prefabricated vertical component 4, a hollow box-shaped structure 2 is provided in the upper part of the connection device 1, a truncated cone-shaped threaded connection end 3 is provided on the upper part of the box-shaped structure 2, a vertical threaded hole 3-1 is provided at the center of the threaded connection end 3 and at the corresponding position of the top plate 2-1 of the box-shaped structure 2, the threaded hole 3-1 matches the thread 6 at the end of the vertical steel bar 5 inside the prefabricated vertical component 4, the upper part of the connection device 1 is connected and fixed to the vertical steel bar 5 inside the prefabricated vertical component 4 through the threaded connection end 3; a cylinder 7 is provided at the lower part of the box-shaped structure 2, annular or spiral convex ribs 7-1 are provided at intervals in the inner cavity of the cylinder 7, the height of the convex rib 7-1 is 1 to 3 mm, a rubber sealing ring 8 is installed at the bottom of the cylinder 7, the sealing ring 8 is tightly fitted and fixed to the inner cavity of the cylinder 7, and the diameter of the opening in the middle of the sealing ring 8 is 3 to 5 mm smaller than the diameter of the lower vertical connection rib 9 m; spiral ribs 10 surround the outer periphery of the cylinder 7 to constrain the concrete around the cylinder 7. The top of the spiral ribs 10 is welded and fixed to the bottom of the box-like structure 2, and the bottom of the spiral ribs 10 is substantially flush with the bottom of the cylinder 7. The plane projection diameter of the spiral ribs 10 is 20 to 50 mm larger than the outer diameter of the cylinder 7; a vertical connecting rib 9 with a threaded upper end is vertically arranged on the top of the lower member 11. During installation, the upper end of the vertical connecting rib 9 passes through the inner cavity of the cylinder 7 and is inserted into the inner cavity of the box-like structure 2 for a certain length. The upper end of the vertical connecting rib 9 is fixed by a matching pad 12 and a nut 13. The bottom of the inner cavity groove of the box-like structure 2 is a grouting pool 15. The pad 12 is evenly provided with fan-shaped holes 18 connecting the grouting pool 15 and the inner cavity of the cylinder 7. Later, grouting material 14 is injected into the grouting pool 15 at the bottom of the inner cavity groove of the box-like structure 2. The grouting material 14 flows into and completely fills the inner cavity gap of the cylinder 7 through the fan-shaped holes 18 of the pad 12, and forms an integral body after hardening. As required, a pad or leveling bolt may be provided at the top of the lower member 11, and a seat mortar 17 may be laid at the top of the lower member 11, so that the seat mortar 17 is filled between the bottom of the prefabricated vertical member 4 and the top of the lower member 11. The center of the threaded connection end 3 and the center of the cylinder 7 are substantially on the same vertical axis, and the threaded connection end 3 and the cylinder 7 may be integrally formed with the box-like structure 2 by casting, or may be integrally formed by steel plate welding or mechanical connection. The above-mentioned connection device 1 may be used for the vertical steel bar connection between the bottom of the prefabricated wall and column vertical members and the lower members.

[0034] Among them, the pad 12 is a circular ring with a thickness of 5 to 10 mm and an outer diameter 10 to 20 mm larger than the inner diameter of the cylinder. The diameter of the opening in the middle of the pad 12 is 3 to 5 mm larger than the diameter of the vertical connecting rib. The pad 12 has no less than four narrow fan-shaped holes 18 radially distributed along the plate surface, which are used as upper grouting holes and exhaust holes of the cylinder 7.

[0035] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0036] Embodiment 1:

[0037] like Figure 1 to Figure 4 As shown, when the bottom of the prefabricated vertical component 4 is connected to the lower component 11 through the vertical connecting rib 9 (single rib), the box-like structure 2 is composed of a top plate 2-1, a bottom plate 2-2 and wall panels 2-3 on three sides (left side, right side and rear side), one side (front side) of the box-like structure 2 is opened and exposed to form a groove as a connection operation space, and a reverse edge 2-4 is provided at the lower edge of the opening at the end of the groove, and the height of the reverse edge 2-4 is 10 to 20 mm, and a grouting pool 15 is formed at the bottom of the groove through the reverse edge 2-4; at least two vertical anchoring ribs 16 are welded to the outer sides of the wall panels 2-3 on the left and right sides of the box-like structure 2, and at the same time, stiffening ribs of the wall panels 2-3 are formed, and the length of the anchoring ribs 16 extending out of the wall panels 2-3 is 50 to 150 mm.

[0038] Embodiment 2:

[0039] like Figure 5 to Figure 7 As shown, when the bottom of the prefabricated vertical component 4 is connected to the lower component 11 through the vertical connecting ribs 9 (double ribs), the box-like structure 2 is composed of a top plate 2-1, a bottom plate 2-2, wall panels 2-3 on both sides (left and right) and a partition 2-5 in the middle. The partition 2-5 is located between the two wall panels 2-3 and is vertically connected to the wall panels 2-3. The two sides (front and rear) of the box-like structure 2 are opened and exposed to form two grooves as connection operation spaces. An anti-edge 2-4 is provided at the lower edge of the opening at the end of each groove. The height of the anti-edge 2-4 is 10 to 20 mm. A grouting pool 15 is formed at the bottom of the groove through the anti-edge 2-4. No less than three vertical anchor ribs 16 are welded on the outer sides of the wall panels 2-3 on the right sides of the box-like structure 2. The length of the anchor rib 16 extending out of the wall panels 2-3 is 50 to 150 mm. The rest of the connection structure is basically the same as that of the single rib connection.

[0040] like Figure 1 to Figure 7 As shown, the construction process of a prefabricated vertical component bottom connection device of the present invention is as follows:

[0041] (1) During factory production, threads 6 are processed at the ends of the vertical steel bars 5 inside the component, which are connected and fixed to the threaded connection ends 3 at the top of the connection device 1. The steel bar cage is tied and placed in a mold, and concrete is poured to form a prefabricated vertical component 4 with a bottom connection device 1;

[0042] (2) During on-site construction, a vertical connecting rib 9 with a threaded upper end is vertically arranged on the top of the lower member 11, and a pad or a leveling bolt is provided, and a seat slurry 17 is laid;

[0043] (3) The upper prefabricated vertical components 4 are hoisted and lowered in sequence, and the cylinder 7 of the bottom connection device 1 of the prefabricated vertical component 4 is inserted into the vertical connection rib 9 at the top of the lower component 11. The vertical connection rib 9 passes through the cylinder 7 and is inserted into the inner cavity of the box-like structure 2 for a certain length. The vertical connection rib 9 is fixed in the exposed groove of the box-like structure 2 with a pad 12 and a nut 13;

[0044] (4) Later, grouting material 14 is injected into the grouting pool 15 at the bottom of the groove of the box-like structure 2. The grouting material 14 flows into and completely fills the inner cavity of the cylinder 7 through the fan-shaped holes 18 of the pad 12, and forms a whole after hardening;

[0045] (5) Seal the groove of the box-like structure 2 with dry hard mortar and smooth it with the outer surface of the prefabricated vertical component 4.

[0046] The results of the implementation examples show that the prefabricated vertical components in the present invention can be quickly fixed to the top of the lower components by bolting through the bottom connecting device. No additional inclined support is required during construction, which can speed up the on-site installation and greatly reduce the construction cost. The lower cylinder of the connecting device is connected to the vertical connecting reinforcement by grouting, which can realize the vertical tension and compression force transmission and horizontal shear resistance of the vertical reinforcement, which is beneficial to ensure the seismic performance and structural safety of the prefabricated building.

[0047] Obviously, as technology advances, a person skilled in the art can implement the concept of the invention in various ways. Therefore, the embodiments of the invention are not limited to the above examples, but vary within the framework of the claims.

Claims

1. A prefabricated vertical component bottom connection device, characterized in that: The upper part of the connection device is provided with a hollow box-like structure, and one side of the box-like structure is exposed to form a groove; the upper part of the box-like structure is provided with a threaded connection end, which is connected to the vertical steel bars inside the prefabricated vertical component through threads; the lower part of the box-like structure is provided with a cylinder, and the outer circumference of the cylinder is surrounded by spiral bars; the top of the lower component is vertically provided with a vertical connecting bar with a thread on the upper end. During installation, the upper end of the vertical connecting bar passes through the inner cavity of the cylinder and is inserted into the inner cavity of the box-like structure, and the upper end of the vertical connecting bar is fixed by a matching pad and nut. The bottom of the inner cavity groove of the box-like structure is a grouting pool, and fan-shaped holes connecting the grouting pool and the inner cavity of the cylinder are evenly arranged on the pad, and the gap between the vertical connecting bar and the inner cavity of the cylinder is connected and fixed by filling grouting material.

2. The prefabricated vertical component bottom connection device according to claim 1, characterized in that: A truncated cone-shaped threaded connection end is provided at the upper part of the box-like structure, and vertical threaded holes are provided at the center of the threaded connection end and at corresponding positions of the top plate of the box-like structure. The threaded holes match the threads at the ends of the vertical steel bars inside the prefabricated vertical components.

3. The prefabricated vertical component bottom connection device according to claim 1, characterized in that: A cylinder is provided at the lower part of the box-like structure. The inner cavity of the cylinder is provided with annular or spiral ribs at intervals. The height of the ribs is 1 to 3 mm. A rubber sealing ring is installed at the bottom of the cylinder. The sealing ring is tightly fitted and fixed to the inner cavity of the cylinder. The diameter of the opening in the middle of the sealing ring is 3 to 5 mm smaller than the diameter of the lower vertical connecting rib.

4. The prefabricated vertical component bottom connection device according to claim 3, characterized in that: The outer periphery of the cylinder is surrounded by spiral ribs, the top of the spiral ribs is welded and fixed to the bottom of the box-shaped structure, the bottom of the spiral ribs is flush with the bottom of the cylinder, and the plane projection diameter of the spiral ribs is 20 to 50 mm larger than the outer diameter of the cylinder.

5. The prefabricated vertical component bottom connection device according to claim 1, characterized in that: A spacer block or a leveling bolt is provided on the top of the lower component, and a seat mortar is laid on the top of the lower component so that the seat mortar is filled between the bottom of the prefabricated vertical component and the top of the lower component.

6. The prefabricated vertical component bottom connection device according to claim 1, characterized in that: The center of the threaded connection end and the center of the cylinder are on the same vertical axis. The threaded connection end, the cylinder and the box-like structure are integrally formed by casting, or the threaded connection end, the cylinder and the box-like structure are integrally formed by steel plate welding or mechanical connection.

7. The prefabricated vertical component bottom connection device according to claim 1, characterized in that: The pad is in the shape of a circular ring with a thickness of 5 to 10 mm. Its outer diameter is 10 to 20 mm larger than the inner diameter of the cylinder. The diameter of the hole in the middle of the pad is 3 to 5 mm larger than the diameter of the vertical connecting reinforcement. There are no less than four narrow fan-shaped holes radially distributed along the pad surface, which are used as upper grouting holes and exhaust holes of the cylinder.

8. The prefabricated vertical component bottom connection device according to claim 1, characterized in that: When the bottom of the prefabricated vertical component is connected to the lower component through a single vertical connecting rib, the box-like structure is composed of a top plate, a bottom plate and wall panels on three sides. One side of the box-like structure is opened and exposed to form a groove as a connection operation space. An anti-edge is provided at the lower edge of the opening at the end of the groove. The height of the anti-edge is 10 to 20 mm, and a grouting pool is formed at the bottom of the groove through the anti-edge. No less than two vertical anchor bars are welded on the outer sides of the wall panels on the left and right sides of the box-like structure, and the stiffening ribs of the wall panels are formed at the same time. The length of the anchor bars extending out of the wall panels is 50 to 150 mm.

9. The prefabricated vertical component bottom connection device according to claim 1, characterized in that: When the bottom of the prefabricated vertical component is connected to the lower component by two vertical connecting ribs, the box-like structure is composed of a top plate, a bottom plate, wall panels on both sides and a partition in the middle. The partition is located between the two wall panels and is vertically integrated with the wall panels. The two side openings of the box-like structure are exposed to form two grooves as a connection operation space. An anti-edge is provided at the lower edge of the opening at the end of each groove. The height of the anti-edge is 10 to 20 mm, and a grouting pool is formed at the bottom of the groove through the anti-edge. No less than three vertical anchor bars are welded on the outer side of the wall panels on the right side of the box-like structure, and the length of the anchor bars extending out of the wall panels is 50 to 150 mm.

10. A construction method for the bottom connection device of a prefabricated vertical component according to any one of claims 1 to 9, characterized in that: The connection device is used to connect the vertical reinforcement between the bottom of the prefabricated wall or column vertical component and the lower component, including the following steps: (1) During factory production, the ends of the vertical steel bars inside the component are threaded and connected and fixed with the threaded connection ends at the top of the connection device. The steel bar cage is tied and placed in a mold, and concrete is poured to form a prefabricated vertical component with a bottom connection device. (2) During on-site construction, vertical connecting bars with threads on the upper end are vertically set on the top of the lower component, and pads or leveling bolts are provided, and seat slurry is laid; (3) The upper prefabricated vertical components are hoisted and lowered in sequence, the cylinder of the bottom connection device of the prefabricated vertical component is inserted into the vertical connection ribs on the top of the lower component, the vertical connection ribs pass through the cylinder and are inserted into the inner cavity of the box-like structure for a certain length, and the vertical connection ribs are fixed in the exposed groove of the box-like structure with a pad and a nut; (4) In the later stage, grouting material is injected into the grouting pool at the bottom of the box-shaped structure groove, and the grouting material flows into and completely fills the inner cavity of the cylinder through the fan-shaped holes of the pad, and forms a whole after hardening; (5) Seal the groove of the box-shaped structure with dry hard mortar and smooth it with the outer surface of the prefabricated vertical component.

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