Prefabricated vertical component bottom connecting device

Abstract

The utility model relates to the technical field of assembly type structures, in particular to a prefabricated vertical component bottom connecting device. 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. The connecting structure is reasonable in structure and reliable in connection, the field installation speed of vertical components such as prefabricated walls and columns can be greatly increased, inclined supports are omitted, the construction cost is greatly reduced, the vertical tension and compression force transmission and the horizontal shear resistance of the vertical steel bars can be achieved, and the anti-seismic property and the structural safety of an assembly type building can be guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of assembly type structure, concretely to a prefabricated vertical component bottom connecting device. BACKGROUND

[0002] In the assembly type structure, the connection between the prefabricated vertical components is the key to guarantee the seismic performance and structural safety of the assembly type structure. How to realize reliable connection between the prefabricated vertical components, facilitate component production and installation, speed up the construction speed on site, and reduce the construction cost is the focus and difficulty in the industry.

[0003] In some regions in Europe and America, the seismic fortification requirement is low, and the dry connection between the bottom of the prefabricated vertical component and the component below is often carried out by using a boot type connecting piece, that is, a hole is formed in the bottom of the boot type connecting piece, and the vertical connecting rib of the component below is bolted, the top of the boot type connecting piece is provided with a vertical anchoring rib, and the vertical connecting rib is connected with the vertical steel bar inside the component to realize the rapid installation and fixation of the prefabricated vertical component. However, there are several key technical problems to be solved in the dry connection mode: first, the hole diameter in the bottom of the boot type connecting piece is larger than the diameter of the vertical connecting rib, and the gap formed causes the upper part of the vertical connecting rib to lack horizontal constraint, so that the horizontal shear resistance of the vertical connecting rib cannot be fully utilized, the shear resistance between the prefabricated vertical component and the component below is basically provided by the upper and lower friction surfaces of the horizontal gap filler layer between the components, and when a larger earthquake occurs, a certain amplitude of horizontal slip will be generated, which is not conducive to the seismic resistance and affects the safety performance of the structure; second, the bolt connection mode in the bottom of the boot type connecting piece can basically only transmit the axial tension of the vertical steel bar, however, in the actual reinforced concrete structure under compression, the vertical steel bar often bears and transmits part of the pressure due to the greater rigidity and elastic modulus of the steel bar, but the bolt connection mode cannot effectively transmit the axial pressure of the vertical steel bar, which reduces the compression resistance of the prefabricated vertical component and the safety reserve of the structure; third, the steel bar lap joint mode of the upper part of the boot type connecting piece causes a great waste of steel bar material, and the force transmission performance is not direct and reliable. The above problems greatly limit the application of the dry connection mode in the assembly type structure in the seismic region of China, cannot fully utilize the advantages of the assembly type rapid construction, and greatly affect the development of the assembly type building in China. CONTENT OF THE UTILITY MODEL

[0004] In view of the above technical problems, the utility model aims to provide a prefabricated vertical component bottom connecting device, which has a reasonable structure, reliable connection, can greatly improve the on-site installation speed of the prefabricated wall and column vertical component, eliminate the inclined support, greatly reduce the construction cost, realize the vertical tension and compression force transmission and horizontal shear resistance of the vertical steel bar, and is beneficial to guarantee the seismic performance and structural safety of the assembly type building.

[0005] In order to achieve the above object, the technical scheme of the utility model is:

[0006] A prefabricated vertical component bottom connecting device, which is characterized in that a hollow box-shaped structure is arranged on the upper part of the connecting device, a groove is formed on one side of the box-shaped structure; a threaded connecting end is arranged on the upper part of the box-shaped structure, and the threaded connecting end is connected with vertical steel bars in the prefabricated vertical component through threads; a cylinder is arranged on the lower part of the box-shaped structure, and helical ribs are arranged around the outer periphery of the cylinder; a vertical connecting rib with a threaded upper end is vertically arranged on the top of the underlying component; during installation, the upper end of the vertical connecting rib penetrates the inner cavity of the cylinder and is inserted into the inner cavity of the box-shaped structure, and the upper end of the vertical connecting rib is fixed through a matched backing plate and a nut; the bottom of the groove in the inner cavity of the box-shaped structure is a grouting pool, fan-shaped holes, which are connected with the grouting pool and the inner cavity of the cylinder, are evenly arranged on the backing plate, and the gap between the vertical connecting rib and the inner cavity of the cylinder is connected and fixed by filling grouting material.

[0007] The prefabricated vertical component bottom connecting device is characterized in that a circular truncated cone-shaped threaded connecting end is arranged on the upper part of the box-shaped structure, vertical threaded holes are arranged at the corresponding positions of the center of the threaded connecting end and the top plate of the box-shaped structure, and the threaded holes are matched with the threads of the end part of the vertical steel bars in the prefabricated vertical component.

[0008] The prefabricated vertical component bottom connecting device is characterized in that a cylinder is arranged on the lower part of the box-shaped structure, annular or helical ribs are arranged in the inner cavity of the cylinder at intervals, the height of the ribs is 1-3 mm, a sealing ring made of rubber is arranged on the bottom of the cylinder, the sealing ring is tightly fixed with the inner cavity of the cylinder, and the diameter of the hole in the middle of the sealing ring is 3-5 mm smaller than the diameter of the lower vertical connecting rib.

[0009] The prefabricated vertical component bottom connecting device is characterized in that helical ribs are arranged around the outer periphery of the cylinder, the top of the helical rib is welded and fixed with the bottom surface of the box-shaped structure, the bottom of the helical rib is flush with the bottom of the cylinder, and the planar projection diameter of the helical rib is 20-50 mm larger than the outer diameter of the cylinder.

[0010] The prefabricated vertical component bottom connecting device is characterized in that a backing block or a leveling bolt is arranged on the top of the underlying component, and seat grouting material is laid on the top of the underlying component, so that the seat grouting material is filled between the bottom of the prefabricated vertical component and the top of the underlying component.

[0011] The prefabricated vertical component bottom connecting device is characterized in that the center of the threaded connecting end and the center of the cylinder are on the same vertical axis, the threaded connecting end and the cylinder are integrally formed with the box-shaped structure through casting, or the threaded connecting end and the cylinder are integrally formed with the box-shaped structure through steel plate welding or mechanical connection.

[0012] The prefabricated vertical component bottom connecting device is characterized in that the backing plate is a circular ring with a thickness of 5-10 mm and an outer diameter of 10-20 mm larger than the inner diameter of the cylinder, the diameter of the hole in the middle of the backing plate is 3-5 mm larger than the diameter of the vertical connecting rib, and the backing plate is radially distributed with not less than four long fan-shaped holes serving as the upper grouting holes and exhaust holes of the cylinder.

[0013] The bottom connecting device of the prefabricated vertical component is characterized in that when the bottom of the prefabricated vertical component is connected to the underlying component through a single vertical connecting rib, a box-shaped structure is formed by a top plate, a bottom plate and three side wall plates, one side of the box-shaped structure is exposed to form a groove as a connecting operation space, a reverse edge is arranged at the lower edge of the opening of the end of the groove, the height of the reverse edge is 10-20 mm, and a grouting pool is formed at the bottom of the groove through the reverse edge; and two vertical anchoring ribs are welded to the outer side of each of the left and right side wall plates of the box-shaped structure, and the anchoring ribs simultaneously form stiffening ribs of the wall plates, and the length of the anchoring ribs extending out of the wall plates is 50-150 mm.

[0014] The bottom connecting device of the prefabricated vertical component is characterized in that when the bottom of the prefabricated vertical component is connected to the underlying component through two vertical connecting ribs, a box-shaped structure is formed by a top plate, a bottom plate, two side wall plates and a middle partition plate, the partition plate is arranged between the two wall plates and is integrally connected with the wall plates perpendicularly, two grooves are formed as connecting operation spaces by exposing the two sides of the box-shaped structure, a reverse edge is arranged at the lower edge of the opening of the end of each groove, the height of the reverse edge is 10-20 mm, and a grouting pool is formed at the bottom of each groove through the reverse edge; and three vertical anchoring ribs are welded to the outer side of each of the right side wall plates of the box-shaped structure, and the length of the anchoring ribs extending out of the wall plates is 50-150 mm.

[0015] Compared with the prior art, the prefabricated vertical component has the following advantages and beneficial effects:

[0016] 1. The prefabricated vertical component can be quickly fixed on the top of the underlying component by the connecting device through bolt connection, and no additional inclined support is needed during construction, so that the on-site installation speed is accelerated, the construction cost is greatly reduced, grouting operation is performed in the cylinder after the prefabricated components are completely installed, and the prefabricated components are integrated after hardening, so that vertical tension and compression force transmission and horizontal shear resistance of the vertical connecting rib are realized, and the seismic performance and structural safety of the fabricated building are ensured.

[0017] 2. The connecting device is connected and fixed to the internal vertical steel bars of the prefabricated vertical component through threaded connection ends, the steel bar force transmission is more direct and reliable, the part of the threaded connection end protruding from the top plate of the box-shaped structure is in a circular truncated cone shape, the force transmission of the vertical steel bars and the top plate of the box-shaped structure is uniformly transitioned, the phenomenon of fracture or falling of the threaded connection end caused by stress concentration is avoided, and the threaded connection quality is ensured.

[0018] 3. The box-shaped structure of this invention has vertical anchor bars welded to the left and right side walls, which effectively improves the rigidity of the side walls and ensures that the box-shaped structure does not deform under large tensile or compressive forces, thus preventing deformation that could affect the connection performance. It also increases the anchoring performance of the box-shaped structure within the concrete. The spiral reinforcement surrounding the outer perimeter of the cylinder effectively restrains the concrete around the cylinder, preventing separation or spalling of the concrete from the outer wall of the cylinder under tension or compression, thereby increasing the anchoring performance of the cylinder within the concrete. This achieves the goals of improving the connection quality between the precast vertical components and the lower components, ensuring the seismic performance and structural safety of the prefabricated building, shortening the construction period, and reducing construction costs. Attached Figure Description

[0019] Fig. 1 This is a three-dimensional schematic diagram of the single-rib connection device of this utility model.

[0020] Fig. 2 This is a front view of the prefabricated vertical component of this utility model, showing the bottom of the component connected to the lower component by a single rib.

[0021] Fig. 3 This is a side view of the prefabricated vertical component of this utility model, showing the bottom of the component connected to the lower component by a single rib.

[0022] Fig. 4 This is a top view of the prefabricated vertical component of this utility model, showing the bottom of the component connected to the lower component by a single rib.

[0023] Fig. 5 This is a three-dimensional schematic diagram of the double-rib connection device of this utility model.

[0024] Fig. 6 This is a side view of the prefabricated vertical component of this utility model, showing the double-reinforced connection between the bottom of the component and the component below.

[0025] Fig. 7 This is a top view of the prefabricated vertical component of this utility model, showing the double-reinforced connection between the bottom of the component and the component below.

[0026] In the diagram: 1. Connecting device, 2. Box-shaped structure, 2-1. Top plate, 2-2. Bottom plate, 2-3. Wall panel, 2-4. Reverse edge, 2-5. Partition, 3. Threaded connection end, 3-1. Threaded hole, 4. Precast vertical component, 5. Vertical reinforcement, 6. Thread, 7. Cylinder, 7-1. Protruding rib, 8. Sealing ring, 9. Vertical connecting reinforcement, 10. Spiral reinforcement, 11. Lower component, 12. Pad, 13. Nut, 14. Grouting material, 15. Grouting pool, 16. Anchoring reinforcement, 17. Bedding grout, 18. Fan-shaped hole. Detailed Implementation

[0027] like Figs. 1-7As shown, the utility model provides a prefabricated vertical component bottom connecting device, embeds steel connecting device 1 in prefabricated vertical component 4 bottom, is equipped with hollow box structure 2 in connecting device 1 upper portion, is equipped with circular table shape threaded connection end 3 on box structure 2 upper portion, threaded connection end 3 center and the top plate 2-1 of box structure 2 corresponding position is equipped with vertical threaded hole 3-1, threaded hole 3-1 and the threaded 6 of prefabricated vertical component 4 inside vertical steel bar 5 end portion is matched, connecting device 1 upper portion and prefabricated vertical component 4 inside vertical steel bar 5 are connected and fixed through threaded connection end 3, box structure 2 lower portion is equipped with cylinder 7, and the annular or spiral convex rib 7-1 is equipped with in the cavity of cylinder 7, and the height of convex rib 7-1 is 1~3mm, and cylinder 7 bottom is equipped with the sealing ring 8 of rubber material, and sealing ring 8 is closely fixed with the cavity of cylinder 7, and the diameter of the aperture in the middle part of sealing ring 8 is less than the diameter of lower vertical connecting rib 9 3~5mm, and the outer circumferential of cylinder 7 is surrounded by spiral rib 10, and it plays the role of the restraint of the concrete of cylinder 7 periphery, and spiral rib 10 top is welded and fixed with box structure 2 bottom surface, and spiral rib 10 bottom is substantially flush with cylinder 7 bottom, and the diameter of the plane projection of spiral rib 10 is greater than the outer diameter of cylinder 7 20~50mm, and the vertical connecting rib 9 with the thread is vertically arranged on the top of the lower component 11 with the upper end, and when installing, the upper end of the vertical connecting rib 9 passes through the cavity of the above-mentioned cylinder 7 and is inserted into the cavity of the box structure 2 for a certain length, and the upper end of the vertical connecting rib 9 is fixed by the matching backing plate 12 and nut 13, and the bottom of the cavity of the box structure 2 is a grouting tank 15, and the backing plate 12 is uniformly provided with a fan-shaped hole 18 that communicates the grouting tank 15 and the cavity of the cylinder 7, and the grouting material 14 is injected into the grouting tank 15 at the bottom of the cavity of the box structure 2 in the later period, and the grouting material 14 flows into and completely fills the gap in the cavity of the cylinder 7 through the fan-shaped hole 18 of the backing plate 12, and after it hardens, it forms an integral whole. According to the need, a cushion block or leveling bolt can also be provided on the top of the lower component 11, and a seat grouting material 17 is laid on the top of the lower component 11, so that the seat grouting material 17 is filled between the bottom of the prefabricated vertical component 4 and the top of the lower component 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 can be integrally formed by casting, or they can be formed as a whole by steel plate welding or mechanical connection. The above-mentioned connecting device 1 can be used for vertical steel bar connection between the bottom of the prefabricated wall, column type vertical component and the lower component.

[0028] Wherein, the backing plate 12 is a circular ring, the thickness is 5~10mm, the outer diameter is greater than the inner diameter of the cylinder 10~20mm, the diameter of the aperture in the middle part of the backing plate 12 is greater than the diameter of the vertical connecting rib 3~5mm, and the backing plate 12 is radially distributed with not less than four long fan-shaped holes 18 along the plate surface, which are used as the upper grouting hole and exhaust hole of the cylinder 7.

[0029] Next, the utility model will be described in detail in combination with the drawings and examples.

[0030] Example 1:

[0031] As Figs. 1-4 shown, for the bottom of the prefabricated vertical component 4 and the underlying component 11 through the vertical connecting rib 9 (single rib) connection, the box-shaped structure 2 is composed of the top plate 2-1, the bottom plate 2-2 and the three sides (left side, right side and back side) wall plate 2-3, one side (front side) of the box-shaped structure 2 is exposed to form a groove as a connecting operation space, the end of the groove is provided with a reverse side 2-4, the height of the reverse side 2-4 is 10-20mm, and the reverse side 2-4 forms a grouting pool 15 at the bottom of the groove; the outer side of the left and right wall plates 2-3 of the box-shaped structure 2 is welded with not less than two vertical anchoring ribs 16, and the anchoring rib 16 forms a stiffening rib of the wall plate 2-3, and the length of the anchoring rib 16 extending out of the wall plate 2-3 is 50-150mm.

[0032] Example 2:

[0033] As Figs. 5-7 shown, for the bottom of the prefabricated vertical component 4 and the underlying component 11 through the vertical connecting rib 9 (single rib) connection, the box-shaped structure 2 is composed of the top plate 2-1, the bottom plate 2-2 and the three sides (left side, right side and back side) wall plate 2-3, one side (front side) of the box-shaped structure 2 is exposed to form a groove as a connecting operation space, the end of the groove is provided with a reverse side 2-4, the height of the reverse side 2-4 is 10-20mm, and the reverse side 2-4 forms a grouting pool 15 at the bottom of the groove; the outer side of the left and right wall plates 2-3 of the box-shaped structure 2 is welded with not less than two vertical anchoring ribs 16, and the anchoring rib 16 forms a stiffening rib of the wall plate 2-3, and the length of the anchoring rib 16 extending out of the wall plate 2-3 is 50-150mm.

[0034] As Figs. 1-7 shown, the construction process of the prefabricated vertical component bottom connecting device is as follows:

[0035] (1) When the factory produces, the end of the vertical steel bar 5 in the component is processed into a thread 6, and is connected and fixed with the threaded connecting end 3 of the top of the connecting device 1, the steel bar cage is placed in the mold after pouring the concrete, and the prefabricated vertical component 4 with the bottom connecting device 1 is formed;

[0036] (2) When the site is constructed, the vertical connecting rib 9 with the thread at the top is vertically arranged on the top of the underlying component 11, and the pad or leveling bolt is arranged, and the seat grouting material 17 is laid;

[0037] (3) sequentially hoist and drop the upper prefabricated vertical component 4, the cylinder 7 of the bottom connecting device 1 of the prefabricated vertical component 4 is sleeved into the vertical connecting rib 9 at the top of the lower component 11, the vertical connecting rib 9 penetrates through the cylinder 7 and is inserted into the inner cavity of the box-shaped structure 2 for a certain length, the vertical connecting rib 9 is fixed in the exposed groove of the box-shaped structure 2 by using the gasket 12 and the nut 13;

[0038] (4) in the later stage, the grouting material 14 is injected into the grouting pool 15 at the bottom of the groove of the box-shaped structure 2, the grouting material 14 flows into and completely fills the gap in the inner cavity of the cylinder 7 through the fan-shaped hole 18 of the gasket 12, and after hardening, an integral body is formed;

[0039] (5) the groove of the box-shaped structure 2 is sealed by using dry hard mortar, and the outer surface of the prefabricated vertical component 4 is smoothed.

[0040] The results of the embodiment show that the prefabricated vertical component in the utility model can be quickly fixed on the top of the lower component by the bottom connecting device through bolt connection, no additional inclined support is needed during construction, the on-site installation speed can be accelerated, and the construction cost can be greatly reduced; the lower cylinder of the connecting device and the vertical connecting rib are connected through grouting, vertical tension and compression transmission and horizontal shear effect of the vertical steel bars can be realized, and the seismic performance and structural safety of the fabricated building can be ensured.

[0041] Obviously, as technical progress, those skilled in the art can implement the concept of the utility model in various ways. Therefore, the utility model implementation scheme is not limited to the above embodiments, and changes are made within the framework of the claims.

Claims

1. A bottom connecting device for a prefabricated vertical component, characterized in that, The connecting device has a hollow box-shaped structure at the top, with one side of the box-shaped structure exposed to form a groove. The upper part of the box-shaped structure has a threaded connection end, which is connected to the vertical steel bars inside the precast vertical component by threads. The lower part of the box-shaped structure has a cylinder, with spiral ribs surrounding the outer circumference of the cylinder. The top of the lower component has a vertically threaded vertical connecting rib. During installation, the upper end of the vertical connecting rib passes through the inner cavity of the cylinder and is inserted into the inner cavity of the box-shaped structure. The upper end of the vertical connecting rib is fixed by matching pads and nuts. The bottom of the groove in the inner cavity of the box-shaped structure is a grouting pool. Fan-shaped holes are evenly opened on the pad to connect the grouting pool and the inner cavity of the cylinder. The gap between the vertical connecting rib and the inner cavity of the cylinder is connected and fixed by filling with grout.

2. The prefabricated vertical component bottom connecting device according to claim 1, characterized in that, The upper part of the box-shaped structure is provided with a frustum-shaped threaded connection end. The center of the threaded connection end and the corresponding position of the top plate of the box-shaped structure are provided with vertical threaded holes, which match the threads of the ends of the vertical steel bars inside the precast vertical components.

3. The prefabricated vertical component bottom connecting device according to claim 1, characterized in that, The lower part of the box-shaped structure is provided with a cylindrical body. The inner cavity of the cylindrical body 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 cylindrical body. The sealing ring is tightly fitted and fixed to the inner cavity of the cylindrical body. 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 connecting device according to claim 3, characterized in that, The outer circumference of the cylinder is surrounded by spiral ribs. The top of the spiral ribs is welded and fixed to the bottom surface of the box-shaped structure, and the bottom of the spiral ribs is flush with the bottom of the cylinder. The diameter of the spiral ribs in planar projection is 20-50 mm larger than the outer diameter of the cylinder.

5. The prefabricated vertical component bottom connecting device according to claim 1, characterized in that, A pad or leveling bolt is placed on top of the lower component, and mortar is laid on top of the lower component so that the mortar fills the space between the bottom of the precast vertical component and the top of the lower component.

6. The prefabricated vertical component bottom connecting 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 and the cylinder are integrally formed with the box-shaped structure by casting, or the threaded connection end and the cylinder are integrally formed by welding steel plates or mechanical connection.

7. The prefabricated vertical component bottom connecting device according to claim 1, characterized in that, The pad is circular with a thickness of 5-10 mm and an outer diameter that is 10-20 mm larger than the inner diameter of the cylinder. The diameter of the opening in the middle of the pad is 3-5 mm larger than the diameter of the vertical connecting rib. The pad has no fewer than four narrow fan-shaped holes that are radially distributed along the surface of the plate, which are used as grouting holes and venting holes in the upper part of the cylinder.

8. The prefabricated vertical component bottom connecting device according to claim 1, characterized in that, When the bottom of the precast vertical component is connected to the component below by a single vertical connecting bar, the box-shaped structure consists of a top plate, a bottom plate, and wall panels on three sides. One side of the box-shaped structure has an exposed opening to form a groove as a connection operation space. A reverse edge is provided at the bottom edge of the opening at the end of the groove, with a height of 10-20mm. A grouting pool is formed at the bottom of the groove through the reverse edge. At least two vertical anchor bars are welded to the outer side of the wall panels on both sides of the box-shaped structure, which also form stiffening ribs of the wall panels. The length of the anchor bars extending out of the wall panels is 50-150mm.

9. The prefabricated vertical component bottom connecting device according to claim 1, characterized in that, When the bottom of the precast vertical component is connected to the lower component by two vertical connecting bars, the box-shaped structure consists of a top plate, a bottom plate, two side wall panels and a middle partition. The partition is located between the two wall panels and is vertically and integrally connected to the wall panels. The two side openings of the box-shaped structure are exposed to form two grooves as connection operation spaces. Each groove has a reverse edge at the bottom of the opening, with a height of 10-20mm. A grouting pool is formed at the bottom of the groove through the reverse edge. At least three vertical anchor bars are welded to the outer side of the right side wall panels of the box-shaped structure. The length of the anchor bars extending out of the wall panel is 50-150mm.

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