A full-precast dry-method connecting cup-mouth steel structure foundation and installation construction method

Abstract

This invention discloses a fully prefabricated dry-connection cup-shaped steel structure foundation and its installation method, belonging to the technical field of fully prefabricated assembled steel structures. This invention employs an adjustable node plate bolt connection node, changing the traditional rebar anchoring and lap splicing construction method, essentially realizing a "reversible" prefabricated installation concept. The fully prefabricated cup-shaped steel structure foundation of this invention achieves complete factory prefabrication and standardization, modular design, avoids on-site wet work, changes the traditional construction method of concrete foundations, improves production efficiency and project quality, and effectively solves problems such as extensive management and low labor productivity in traditional foundation construction.

Description

Technical Field

[0001] This invention belongs to the technical field of fully prefabricated assembled steel structures, specifically relating to a fully prefabricated dry-connection cup-shaped steel structure foundation and its installation method. Background Technology

[0002] With the transformation and upgrading of the construction industry towards "green, industrialized, and intelligent" construction, prefabricated buildings have become a core construction mode vigorously promoted by the industry, and are now widely used in various types of above-ground buildings. However, due to the need for the building structure foundation to be buried underground, requiring high corrosion resistance, and the complexity of foundation types and connection methods, standardization and modularization requirements cannot be achieved. As a result, the foundation still uses traditional wet construction methods. However, this method requires on-site pouring and curing, resulting in a long construction cycle. The pouring quality is affected by the site environment and worker factors, making quality control difficult. Furthermore, cast-in-place buildings generate more dust and waste, significantly impacting the environment.

[0003] Prefabricated components can reduce on-site wet work by more than 60% and construction waste by 50%, meeting green building standards. Furthermore, traditional construction methods are more complex for prefabricated steel structure foundations, requiring additional pre-embedded connectors, secondary leveling of steel components, and secondary pouring of outer concrete, thus demanding higher quality control standards.

[0004] Therefore, there is an urgent need to study a method for underground fully prefabricated steel structure foundations and corresponding connecting devices and dry assembly schemes. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a fully prefabricated dry-connection cup-shaped steel structure foundation and installation method to solve the problems mentioned in the background art or achieve better technical effects.

[0006] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention. This invention discloses a fully prefabricated dry-connected cup-shaped steel structure foundation, including a foundation pad, a prefabricated foundation slab, a prefabricated beam, a secondary fine aggregate concrete base, and an upper steel column. The bottom of the prefabricated foundation slab is provided with a base shear key, which serves as a keyway for fixing the pile top. The bottom end of the prefabricated foundation slab is connected to the foundation pad through the base shear key, and the top end of the prefabricated foundation slab is provided with a prefabricated beam. The end of the prefabricated beam is connected to a cup with a keyway, and the upper steel column is installed inside the cup with a keyway. The upper part of the cup with a keyway is provided with a secondary fine aggregate concrete base.

[0007] Furthermore, the prefabricated foundation slab is a regular rectangular prefabricated component with a thickness of 200mm.

[0008] Furthermore, a foundation pad layer is laid at the bottom of the precast foundation slab, and the thickness of the foundation pad layer is ≥150mm; a precast beam is installed at the top of the precast foundation slab.

[0009] Furthermore, the precast foundation slab is reinforced with reinforcing steel bars, which can reduce the weight of the entire precast foundation slab while ensuring the foundation's load-bearing capacity.

[0010] Furthermore, the inside of the keyway cup is provided with an octagonal annular connector, and the precast beam is connected to the upper grooved connecting plate and the lower grooved connecting plate.

[0011] Furthermore, the octagonal annular connector is welded from two annular channel steels, and four fixing supports are provided inside the octagonal annular connector.

[0012] Furthermore, the fixing support is placed on top of the base plate, and a vertical stiffening plate is provided at the position of the fixing support on the annular channel steel. The thickness of the vertical stiffening plate is the same as the thickness of the octagonal annular connector.

[0013] Furthermore, the precast beam is provided with a channel-shaped upper connecting plate and a channel-shaped lower connecting plate, with two bolt holes reserved on the channel-shaped upper connecting plate and the channel-shaped lower connecting plate, and shear studs are provided at the flange positions of the channel-shaped upper connecting plate and the channel-shaped lower connecting plate.

[0014] Furthermore, lifting rings for foundation installation are evenly arranged between the foundation and the precast beam. The number of lifting rings for foundation installation is ≥2 sets, and they are evenly arranged along the center of the foundation. A shear keyway needs to be reserved at the connection between the cup and the foundation beam on the outside of the cup. The recessed depth of the shear keyway is ≥30mm.

[0015] Furthermore, the installation and construction method for any of the above-mentioned fully prefabricated dry-connection cup-shaped steel structure foundations includes the following steps:

[0016] S1: After the site is leveled and the pile foundation is constructed, a foundation cushion layer is laid with a thickness of 150mm.

[0017] S2: Hoist the precast foundation into place, and use specialized equipment to check the plane coordinates and elevation of the foundation, and perform preliminary leveling of the foundation to control its tilt.

[0018] S3: After the foundation is installed in place, insert the upper steel column into the cup opening. After the upper steel column is vertically and horizontally corrected, it is used to fix the leveling anchor bolts. Pressure grouting is performed on the cup opening through the grouting hole so that the steel column and the foundation are completely embedded.

[0019] S4: After the steel column and foundation are embedded, the connection construction between the foundation and the precast beam can be carried out. After the foundation connecting beam is installed in place, the connection node is poured for the second time so that the foundation and the connecting beam are integrated into one.

[0020] S5: Carry out the construction of the outer column base. After the secondary binding of the circumferential reinforcement of the column base is completed, install the steel mold for secondary pouring on the outside of the cup mouth. Pour fine stone concrete into the column base through the dedicated pouring hole to make it dense, thus completing the installation process of the entire precast foundation.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] (1) This invention improves the connection method between the foundation and the foundation tie beam by adopting an adjustable node plate bolt connection node, which changes the traditional steel bar anchorage lap splicing construction method and basically realizes a "reversible" prefabricated installation concept. This invention greatly improves production efficiency and reduces the construction period. At the same time, it adopts a completely dry construction method with no wet work on site, which can minimize construction waste. It is a highly industrialized building component and a product of the current green construction method.

[0023] (2) The present invention realizes efficient connection between precast foundation and upper steel column. By pre-reserved cup-steel column insertion installation method, the process of installing anchor bolts for steel column foot connection is eliminated, as well as the problem of difficult concrete pouring at the bottom of column foot plate is eliminated. This ensures the connection quality between steel column and precast foundation and saves installation time between precast foundation and upper steel column.

[0024] (3) The fully prefabricated cup-shaped steel structure foundation of the present invention realizes the prefabrication and standardization of the entire factory, modular design, avoids on-site wet operation, changes the construction method of traditional concrete foundation, improves production efficiency and project quality, and effectively solves the problems of extensive management and low labor productivity in the traditional foundation construction process.

[0025] (4) The fully precast concrete cup-shaped foundation of this invention realizes the breakthrough of the prefabricated construction concept in the foundation stage, realizes the efficient construction concept of factory prefabrication and on-site assembly, can reduce energy consumption and carbon emissions in the construction process, and also meets the national policy requirements for achieving high-quality development of the construction industry. Attached Figure Description

[0026] Figure 1 This is an isometric schematic diagram of the fully prefabricated cup-shaped base of the present invention;

[0027] Figure 2 This is a longitudinal cross-sectional schematic diagram of the fully prefabricated cup-shaped base of the present invention;

[0028] Figure 3 This is a schematic cross-sectional view of the fully prefabricated cup-shaped base of the present invention;

[0029] Figure 4 This is a top view of the fully prefabricated cup-shaped base of the present invention;

[0030] Figure 5 This is a schematic diagram of the basic structure of the fully prefabricated cup mouth of the present invention;

[0031] Figure 6 This is a schematic diagram of the connecting beam connection device of the present invention.

[0032] The attached figures are labeled as follows:

[0033] 1. Length of the foundation slab;

[0034] 2. Width of the foundation slab;

[0035] 3. Basal shear keys;

[0036] 4. Foundation slab reinforcement;

[0037] 5. Foundation slab thickness;

[0038] 6. Pre-embed leveling anchors;

[0039] 7. Reinforcing bars on the outer side of the cup opening;

[0040] 8. Reinforcing steel bars inside the cup opening;

[0041] 9. Circumferential reinforcing bars at the cup opening;

[0042] 10. Cup rim with keyway;

[0043] 11. Grouting holes;

[0044] 12. Lifting rings for basic installation;

[0045] 13. Octagonal ring connector;

[0046] 14. Channel-shaped upper connecting plate;

[0047] 15. Channel-shaped lower connecting plate;

[0048] 16. Shear-resistant keyway;

[0049] 17. Fixed supports;

[0050] 18. Vertical stiffening plate;

[0051] 19. Bolt holes for connection;

[0052] 20. Ø40 concrete pouring hole;

[0053] 21. Shear studs;

[0054] 22. Foundation padding;

[0055] 23. Upper steel column;

[0056] 24. Column base circumferential reinforcement;

[0057] 25. Steel molds for secondary pouring;

[0058] 26. Secondary footing with fine aggregate concrete;

[0059] 27. Leveling device for upper steel columns;

[0060] 28. Keyway for connection;

[0061] 29. Precast beams;

[0062] 30. Precast foundation slab. Detailed Implementation

[0063] To make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to specific examples.

[0064] Example 1

[0065] like Figures 1-6 As shown, a fully prefabricated dry-connected cup-shaped steel structure foundation includes a foundation pad 22, a prefabricated foundation slab 30, a prefabricated beam 29, a secondary fine aggregate concrete base 26, and an upper steel column 23. The bottom of the prefabricated foundation slab 30 is provided with a base shear key 3, which serves as a keyway for fixing the pile top. The bottom end of the prefabricated foundation slab 30 is connected to the foundation pad 22 via the base shear key 3. The top end of the prefabricated foundation slab 30 is provided with a prefabricated beam 29, and the end of the prefabricated beam 29 is connected to a keyway cup 10. The upper steel column 23 is installed inside the keyway cup 10, and the upper part of the keyway cup 10 is provided with a secondary fine aggregate concrete base 26.

[0066] The precast foundation slab 30 is a regular rectangular precast component, with side lengths of 1 (foundation slab length) and 2 (foundation slab width), and a preferred thickness of 200mm. A foundation pad 22 is laid at the bottom of the precast foundation slab 30, and the thickness of the foundation pad 22 is preferably not less than 150mm to facilitate base leveling. A precast beam 29 is installed at the top of the precast foundation slab 30.

[0067] As a preferred option, the precast foundation slab 30 is reinforced with reinforcing steel bars 4 according to the design requirements. This can reduce the weight of the entire precast foundation slab 30 while ensuring the foundation's load-bearing capacity.

[0068] The precast beam 29 is equipped with an octagonal ring connector 13 inside. The precast beam 29 is connected to a grooved upper connecting plate 14 and a grooved lower connecting plate 15. There are generally no less than 2 sets of lifting rings for foundation installation, which are evenly arranged along the center of the foundation. A shear keyway 16 for secondary casting connection surface needs to be reserved at the connection part between the cup mouth and the foundation connecting beam. The recessed depth of the keyway is not less than 30mm.

[0069] The keyway cup opening 10 is a core part of the precast cup opening construction. In order to improve the embedment of the upper steel column 23 and the foundation, a shear keyway 16 is set in the cup opening, and the shear keyway 16 is recessed to a depth of not less than 30mm. A secondary grouting hole 11 for fine stone concrete needs to be reserved at the bottom of the cup opening. Before the cup opening concrete is poured, the lifting ring 12 for foundation installation needs to be prepared.

[0070] The octagonal annular connector 13 is a key connection device between the precast foundation and the precast beam 29. The octagonal annular connector 13 is embedded within the cup-shaped opening of the precast foundation. The precast beam 29 is connected to an upper channel-shaped connecting plate 14 and a lower channel-shaped connecting plate 15, which transfer the beam end bending moment to the precast foundation. The octagonal annular connector 13 is welded from two annular channel steels. To facilitate installation and fixation with the precast foundation, at least four octagonal annular connector fixing supports 17 are provided. The circumferential channel steel is placed on the top of the base plate 18, and a vertical stiffening plate 18 is set at the support position. The thickness of the vertical stiffening plate 18 is the same as the thickness of the annular connector plate. The upper and lower connecting plates of the proprietary channel type are reserved with no less than 2 bolt holes 19 for connection. In order to facilitate the concrete pouring at the connection part, no less than 1 Ø40 concrete pouring hole 20 is left at the position of the channel type connecting plate. In order to ensure the reliable connection between the annular connector and the cup foundation, proprietary shear studs 21 are set at the upper and lower flange positions of the annular channel steel.

[0071] Example 2

[0072] The fabrication process of the fully prefabricated dry-connected cup-shaped steel structure foundation in Example 1 above includes the following steps:

[0073] (1) The fully prefabricated dry connection cup-shaped steel structure foundation is a prefabricated component formed in one step in the factory. When prefabricating in the factory, a special customized mold table needs to be set up in combination with the foundation plate length 1 and foundation plate width 2 required by the design. Since the prefabricated foundation is usually shallow, a keyway 3 for fixing the pile top is opened at the bottom of the foundation. The keyway 3 for fixing the pile top also serves as the base shear key.

[0074] (2) Install custom steel formwork on the custom formwork platform in combination with the length 1 and width 2 of the foundation plate. After the steel formwork is installed, a layer of interface agent should be brushed to facilitate the demolding of the precast components. After the steel formwork is installed, tie the foundation plate reinforcement 4 according to the design requirements. While ensuring the foundation's load-bearing requirements, appropriately reduce the foundation's own weight and set the foundation plate thickness 5 to 200mm. To reduce the difficulty of preparing the precast foundation, the cup-shaped part and the base plate part of the concrete can be poured separately. However, at the same time as pouring, it is necessary to make the pre-embedded vertical positioning bolts 6 for leveling the steel column and the outer reinforcement 7 and inner reinforcement 8 of the cup-shaped part. There should be no less than 4 sets of vertical positioning bolts 6, which are evenly and symmetrically arranged along the center of the foundation. The outer reinforcement 7 of the cup-shaped part should be higher than the inner reinforcement 8 of the cup-shaped part by one time the height of the secondary outer column foot.

[0075] (3) After the precast foundation slab is poured, the circumferential reinforcement 9 of the precast cup mouth can be tied. The cup mouth groove 10 is the core link of the precast cup mouth construction. In order to improve the embedment of the upper steel column and the foundation, the cup groove is provided with a shear keyway. The keyway 28 is recessed to a depth of not less than 30mm. At the bottom of the cup groove, a secondary grouting hole 11 for fine stone concrete needs to be reserved. Before the cup mouth concrete is poured, the foundation installation lifting ring 12, octagonal ring connector 13, and precast connecting beam connected with a groove upper connecting plate 14 and a groove lower connecting plate 15 are required. The foundation installation lifting ring is generally not less than 2 sets and is evenly arranged along the center of the foundation. At the connection part between the cup mouth and the foundation connecting beam, a secondary pouring connection surface shear keyway 16 needs to be reserved. The keyway is recessed to a depth of not less than 30mm. After the above procedures are completed, the cup mouth concrete is poured and cured in one step.

[0076] Example 3

[0077] The installation method of the fully prefabricated dry-connection cup-shaped steel structure foundation in Embodiment 1 above includes the following steps:

[0078] (1) After the site is leveled and the pile foundation is constructed, the foundation cushion layer 22 is laid. The thickness of the foundation cushion layer 22 is recommended to be no less than 150mm in order to facilitate the leveling of the foundation.

[0079] (2) The precast foundation is hoisted into place, and the plane coordinate position and base elevation of the foundation are checked by special equipment. The foundation is then initially leveled to control the inclination of the foundation.

[0080] (3) After the foundation is installed in place, the upper steel column 23 is inserted into the cup opening. After the upper steel column 23 is vertically and horizontally corrected, it is used to fix the leveling anchor bolt 6. The cup opening is pressure grouted through the grouting hole so that the steel column and the foundation are completely embedded.

[0081] (4) After the steel column is embedded in the foundation, the connection construction between the foundation and the precast beam 29 can be carried out. After the foundation connecting beam is installed in place, the connection node is poured for the second time so that the foundation and the connecting beam are integrated into one.

[0082] (5) Finally, the construction of the outer column base is carried out. After the circumferential reinforcement 24 of the column base is tied for the second time, the steel mold 25 for secondary pouring is installed on the outside of the cup mouth. The column base is poured with fine stone concrete through the dedicated pouring hole, thus completing the installation process of the entire precast foundation.

Claims

1. A fully prefabricated dry-connection cup-shaped steel structure foundation, characterized in that, The foundation includes a foundation pad (22), a precast foundation slab (30), a precast beam (29), a secondary footing of fine stone concrete (26), and an upper steel column (23). The bottom of the precast foundation slab (30) is provided with a base shear key (3), which is used as a keyway for fixing the pile top. The bottom end of the precast foundation slab (30) is connected to the foundation pad (22) through the base shear key (3). The top end of the precast foundation slab (30) is provided with a precast beam (29). The end of the precast beam (29) is connected to a keyway cup (10). The upper steel column (23) is installed inside the keyway cup (10). The upper part of the keyway cup (10) is provided with a secondary footing of fine stone concrete (26).

2. The fully prefabricated dry-connection cup-shaped steel structure foundation according to claim 1, characterized in that, The precast foundation slab (30) is a regular rectangular precast component, and the thickness (5) of the foundation slab is 200mm.

3. The fully prefabricated dry-connection cup-shaped steel structure foundation according to claim 1, characterized in that, The bottom end of the precast foundation slab (30) is covered with a foundation pad (22), the thickness of which is ≥150mm; a precast beam (29) is placed on the top end of the precast foundation slab (30).

4. The fully prefabricated dry-connection cup-shaped steel structure foundation according to claim 1, characterized in that, The precast foundation slab (30) is internally reinforced with foundation slab steel bars (4), which can reduce the weight of the entire precast foundation slab (30) while ensuring the foundation's load-bearing requirements.

5. The fully prefabricated dry-connection cup-shaped steel structure foundation according to claim 1, characterized in that, The inside of the keyway cup (10) is provided with an octagonal annular connector (13), and the precast beam (29) is connected to the upper grooved connecting plate (14) and the lower grooved connecting plate (15).

6. The fully prefabricated dry-connection cup-shaped steel structure foundation according to claim 5, characterized in that, The octagonal annular connector (13) is welded from two annular channel steels, and four fixed supports (17) are provided inside the octagonal annular connector (13).

7. The fully prefabricated dry-connection cup-shaped steel structure foundation according to claim 6, characterized in that, The fixed support (17) rests on the top of the base plate (18), and the annular channel steel is provided with a vertical stiffening plate (18) at the position of the fixed support (17). The thickness of the vertical stiffening plate (18) is the same as the thickness of the octagonal annular connector (13).

8. The fully prefabricated dry-connection cup-shaped steel structure foundation according to claim 1, characterized in that, The precast beam (29) is provided with a channel-shaped upper connecting plate (14) and a channel-shaped lower connecting plate (15). Two bolt holes (19) for connection are reserved on the channel-shaped upper connecting plate (14) and the channel-shaped lower connecting plate (15). Shear studs (21) are provided at the flange positions of the channel-shaped upper connecting plate (14) and the channel-shaped lower connecting plate (15).

9. The fully prefabricated dry-connection cup-shaped steel structure foundation according to claim 1, characterized in that, A foundation installation lifting ring (12) is evenly arranged between the foundation and the precast beam (29). The number of foundation installation lifting rings (12) is ≥2 sets, and they are evenly arranged along the center of the foundation. A shear keyway (16) needs to be reserved at the connection between the cup opening and the foundation beam (29). The shear keyway (16) has a recessed depth of ≥30mm.

10. An installation and construction method for a fully prefabricated dry-connected cup-shaped steel structure foundation as described in any one of claims 1 to 9, characterized in that, The steps are as follows: S1: After the site is leveled and the pile foundation is constructed, a foundation cushion layer (22) is laid with a thickness of 150mm. S2: Hoist the precast foundation into place, and use specialized equipment to check the plane coordinates and elevation of the foundation, and perform preliminary leveling of the foundation to control its tilt. S3: After the foundation is installed in place, insert the upper steel column (23) into the cup opening. After the upper steel column (23) is vertically and horizontally corrected, it is used to fix the leveling anchor bolt (6). The cup opening is pressure grouted through the grouting hole so that the steel column and the foundation are completely embedded. S4: After the steel column and foundation are embedded, the connection construction between the foundation and the precast beam (29) can be carried out. After the foundation connecting beam is installed, the connection node is poured for the second time so that the foundation and the connecting beam are integrated into one. S5: Carry out the construction of the outer column base. After the second binding of the column base circumferential reinforcement (24) is completed, install the steel mold (25) for secondary pouring on the outside of the cup mouth. Pour fine stone concrete into the column base through the dedicated pouring hole to make it dense, thus completing the installation process of the entire precast foundation.

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