A connecting device for a prefabricated construction and a foundation

Abstract

A kind of connecting device of prefabricated mechanism and base for building, comprising: prefabricated mechanism, it is shaped structure, and its inside is provided with several reserved channels along its height direction;Cast-in-place base, the upper end port is configured with the reserved port connected with prefabricated mechanism, the longitudinal section of the reserved port is configured as eight character shape structure;Adjustable shim, it is set between prefabricated mechanism and cast-in-place base, for adjusting the elevation of prefabricated mechanism;Reinforcing bar, it passes through the channel and adjustable shim, is anchored in cast-in-place base;Secondary grouting is carried out to the gap between cast-in-place base and prefabricated mechanism and reserved channel, to form secondary grouting layer, to make prefabricated mechanism and cast-in-place base be connected in one body.Overall structure design is simple and reasonable, not only expands connecting contact surface, increases the occlusal area of concrete between different structures, improves shear capacity;Overall stress system uses rigid connection, high strength.

Description

Technical Field

[0001] This application pertains to the field of architectural design and construction, and is particularly applicable to scenarios such as metallurgical engineering and industrial plants where a reliable connection between large equipment foundations and cast-in-place bases is required. This technology can be widely used in the connection construction of precast components and cast-in-place structures, and is especially suitable for projects with high requirements for construction accuracy and connection strength. Background Technology

[0002] In traditional building construction, large equipment foundations are typically constructed using cast-in-place methods, which presents challenges such as long construction periods and difficulty in controlling the precision of embedded bolts. While precast component technology can improve construction efficiency and quality, the connection between precast components and cast-in-place foundations remains a technical challenge, particularly due to the poor overall integrity of the connection and insufficient resistance to loads such as equipment weight and vibration. Furthermore, uneven surfaces on the cast-in-place foundation make it difficult to accurately control the elevation of precast components, affecting subsequent equipment installation. Summary of the Invention

[0003] This application provides a connection device between a prefabricated building structure and a base, which solves the technical problems of insufficient integrity, poor durability and seismic performance of the connection nodes in the prior art.

[0004] To solve at least one of the above-mentioned technical problems, the technical solution adopted in this application is:

[0005] A connection device between a prefabricated building structure and a base, comprising:

[0006] The prefabricated structure is a molded structure, and its interior has several reserved channels along its height direction;

[0007] The cast-in-place base has a reserved opening at its upper end for connection with the prefabrication mechanism, and the longitudinal section of the reserved opening is constructed as a figure-eight structure.

[0008] An adjustable pad is provided between the precast mechanism and the cast-in-place base to adjust the elevation of the precast mechanism;

[0009] The reinforcing bars pass through the duct and the adjustable pad and are anchored in the cast-in-place base.

[0010] Secondary grouting is performed in the gap between the cast-in-place base and the precast structure, as well as in the reserved channels, to form a secondary grouting layer, so that the precast structure and the cast-in-place base are connected as one unit.

[0011] Furthermore, the longitudinal section of the prefabricated mechanism is an inverted T-shaped structure, and its lower end face is provided with a boss surface; the maximum circumscribed circle diameter of the boss surface is smaller than the minimum inscribed circle diameter of the reserved opening.

[0012] Furthermore, the channel extends through the height of the prefabricated structure, and its upper surface is constructed as a stepped surface.

[0013] Furthermore, the upper end face of the reinforcing bar is fixed to the step surface by a nut.

[0014] Furthermore, the secondary grouting layer covers the nut and is flush with the top surface of the prefabrication mechanism.

[0015] Furthermore, the lower end face of the reinforcing bar is constructed as an L-shaped structure and is bent and anchored within the cast-in-place base.

[0016] Furthermore, the included angles of the two inclined sides of the longitudinal section of the reserved opening are the same, and the angle is not less than 90° and greater than 30°.

[0017] Furthermore, the adjustable pad is disposed on the lower surface of the prefabrication mechanism and located within the reserved opening.

[0018] Furthermore, at least one set of adjustable pads is provided below each of the channels, and each set has at least two adjustable pads.

[0019] The connection device between the prefabricated building structure and the base designed in this application forms a flexible-rigid composite connection with the figure-eight-shaped reserved opening, vertical steel bars and adjustable pads, which improves the overall integrity, connection strength and overall seismic resistance of the connection. The structural design is simple and reasonable, which not only expands the connection contact surface, but also increases the interlocking area of ​​concrete between different structures and improves shear resistance. Attached Figure Description

[0020] Figure 1 This is a structural schematic diagram of a connection device between a prefabricated building structure and a base, as described in this application.

[0021] Figure 2 This is an enlarged schematic diagram of part A in this application;

[0022] Figure 3 This is a schematic diagram of the structure after one grouting in this application;

[0023] Figure 4 This is a schematic diagram of the structure after secondary grouting in this application;

[0024] Figure 5 This is a top view of one of the connecting devices in this application;

[0025] Figure 6 This is a top view of another connecting device in this application.

[0026] In the picture:

[0027] 10. Precast structure; 11. Duct; 20. Cast-in-place foundation

[0028] 21. Reserved opening 30. Adjustable shim 40. Reinforcing steel bar

[0029] 41. Nut; 50. Secondary grouting layer Detailed Implementation

[0030] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0031] This embodiment proposes a connection device between a prefabricated building structure and a base, such as... Figure 1 As shown, the structure includes a precast component 10 fabricated in a prefabrication plant, a cast-in-place foundation 20 directly poured on-site with initial grouting, an adjustable pad 30 for adjusting the elevation of the precast component 10, and vertical reinforcing bars 40 for connecting the precast component 10 and the cast-in-place foundation 20. The precast component 10 is a pre-formed structure with several pre-reserved channels 11 along its height. The upper end of the cast-in-place foundation 20 has a pre-reserved opening 21 for connection with the precast component 10, and the longitudinal section of the pre-reserved opening 21 is constructed in a V-shape. The adjustable pad 30 is placed within the pre-reserved opening 21 between the precast component 10 and the cast-in-place foundation 20. The reinforcing bars 40 pass through the channels 11 and the adjustable pad 30 and are anchored within the cast-in-place foundation 20. Secondary grouting is performed on the gap between the cast-in-place foundation 20 and the precast component 10, as well as within the pre-reserved channels 11, forming a secondary grouting layer 50, thereby connecting the precast component 10 and the cast-in-place foundation 20 as a single unit. The reserved opening and the precast mechanism, as well as the adjustable pad and the precast mechanism 10, form a flexible adjustment; the vertical reinforcement and the cast-in-place and precast mechanisms, as well as the secondary grouting operation, form a rigid connection between the cast-in-place and precast mechanisms. This flexible-rigid composite connection formed by the V-shaped reserved opening, vertical reinforcement and adjustable pad not only solves the technical problems of insufficient integrity of the connection between the cast-in-place base 20 and the precast component 10, the difficulty in controlling the elevation of the precast component 10 due to the uneven surface of the cast-in-place base 20, and the complex construction of traditional connection methods; but also ensures the accuracy of the embedded bolts, improves the overall resistance to dynamic loads, and improves the durability and seismic performance of the connection nodes.

[0032] In this embodiment, the maximum cross-section of the prefabricated mechanism 10 is smaller than the minimum cross-section of the reserved opening 21, thereby ensuring that the prefabricated mechanism 10 can be smoothly placed into the reserved opening 21. The longitudinal section of the prefabricated mechanism 10 is an inverted T-shaped structure, that is, the bottom surface of the prefabricated mechanism 10 is provided with an outwardly extending boss surface to improve the stability of the base of the prefabricated mechanism 10, and the height of the boss surface of the prefabricated structure 10 is less than the depth of the reserved opening 21. The prefabricated structure 10 can be one of a cylinder, a polygonal cylinder, or a quadrilateral cylinder, and its lower boss surface can be a circular structure, a polygonal structure, or a quadrilateral structure.

[0033] As long as the maximum circumscribed circle diameter of the boss surface is less than the minimum inscribed circle diameter of the reserved opening 21, a gap can be created between the precast mechanism 10 and the cast-in-place base 20, facilitating secondary grouting to form a secondary grouting layer 50 and improving the connection strength. The precast mechanism 10 is processed in the factory to ensure the accuracy of the embedded bolts, which also shortens the on-site construction time by more than 40% and allows the positional deviation of the embedded bolts to be controlled within ±2mm.

[0034] like Figure 2 , 4 As shown, the duct 11 is set at a height that penetrates through the precast structure 10. Its upper end face is constructed as a stepped surface to facilitate the fixing of the upper end face of the reinforcing bar 40 to the top of the precast structure 10 via the nut 41, and to ensure that the reinforcing bar 40 and the nut 41 are completely covered during secondary grouting, thereby protecting the reinforcing bar 40 and the connecting nut 41 from corrosion. At the same time, the secondary grouting layer 50 covering the nut 41 is flush with the top surface of the precast structure 10 to improve the appearance of the precast structure 10.

[0035] like Figure 4 The image shows the secondary grout layer 50 formed after the initial secondary grouting. Secondary grouting fills all voids with high-strength grout, forming a unified load-bearing system while protecting the reinforcing bars and nuts from corrosion. Secondary grouting not only improves the integrity and seismic performance of the connection joint, but also prevents corrosion of the reinforcing bars and nuts, improves durability, enhances load transfer capacity, reduces stress concentration, and increases overall reliability.

[0036] like Figure 3 As shown, the cast-in-place foundation 20 structure after the first grouting pour on site forms a figure-eight structure. This connection uses a figure-eight-shaped, outwardly expanding conical opening to increase the contact area of ​​the concrete, enhancing mechanical interlocking force and shear resistance. This not only increases the bonding area of ​​the concrete and improves shear bearing capacity, but also prevents cracking at the connection due to stress concentration, improving the overall seismic performance of the structure. Preferably, the included angle of the two inclined sides of the longitudinal section of the opening 21 is the same, formed by casting using a customized conical wooden template; and its angle is not less than 90° and greater than 30°. Through the figure-eight-shaped opening 21 structure, by expanding the connection contact surface, increasing the interlocking area of ​​the concrete, and improving shear resistance, the overall integrity and connection strength of the connection between the precast structure 10 and the cast-in-place foundation 20 can be enhanced.

[0037] One end of the vertical reinforcing bar 40 is bent and anchored within the cast-in-place base 20 to improve pull-out resistance; the other end is threaded and passes through the reserved hole 11 of the precast mechanism 10, and is locked in place by a steel washer and double nuts 41 to form a rigid connection. Preferably, the lower end face of the reinforcing bar 40 is constructed in an L-shape, directly inserted into the cast-in-place base 20 and bent and anchored within it to prevent slippage. The top of each reinforcing bar 40 is fixed by a washer and two stacked nuts 41, both recessed within the stepped surface. This connection method using vertical reinforcing bars 40 not only improves shear and bending resistance, but also, after grouting into the reserved hole 11, the reinforcing bar and concrete form an integral load-bearing system, improving its resistance to deformation.

[0038] An adjustable shim 30 is installed between the cast-in-place base 20 and the precast structure 10. The thickness of the shim is adjusted to compensate for the unevenness of the surface of the cast-in-place base 20, ensuring the accurate installation elevation of the precast structure 10. The adjustable shim 30 is positioned on the lower surface of the precast structure 10 and located within the reserved opening 21. Preferably, at least one set of adjustable shims 30 is installed below each opening 11, with at least two shims 30 in each set. The number of adjustable shims 30 in all sets is the same, aiming to synchronously adjust the elevation of the precast structure 10. The thickness of the adjustable shims 30 compensates for construction errors on the surface of the cast-in-place base, thus solving the elevation problem caused by the unevenness of the cast-in-place base 20 surface, ensuring the accurate elevation of the precast structure 10, and limiting the elevation error to ±1mm. This not only eliminates the impact of cast-in-place construction errors on equipment installation but also ensures the levelness of the precast structure 10, preventing uneven stress after installation, improving construction efficiency, and reducing on-site leveling work.

[0039] like Figure 5-6 As shown, these are all top views of the prefabricated structure 10. Based on the cross-sectional schematic diagram of the prefabricated structure 10, the corresponding top view of the reserved opening 21 is adapted to the prefabricated structure 10. At the same time, the number of the ducts 11 is symmetrically arranged along the cross-section of the prefabricated structure 10 or evenly arranged along its radial plane.

[0040] like Figure 5 As shown, both the precast structure 10 and the cast-in-place base 20 are circular structures, and the reserved opening 21 is a conical structure. Correspondingly, two layers of adjustable pads 30 are provided below the cast-in-place base 20. The number of adjustable pad 30 components in the inner layer is the same as the number of holes 11, which is four; the number of adjustable pad 30 components in the outer layer is six.

[0041] like Figure 6As shown, the precast mechanism 10 has a cylindrical body and a square bottom protrusion. The cast-in-place base 20 has a square structure, and the reserved opening 21 has a frustum-shaped structure. Accordingly, two layers of adjustable pads 30 are provided below the cast-in-place base 20. The number of adjustable pad 30 components in the inner layer is the same as the number of holes 11, which are four and located on the same circle. The outer layer has four adjustable pad 30 components, which are symmetrically arranged.

[0042] This application effectively solves the technical challenges of connecting precast components to cast-in-place foundations through innovative connection node design and construction methods, providing reliable technical support for building industrialization. A flexible-rigid composite connection is formed through a figure-eight-shaped pre-reserved opening, vertical reinforcement, and adjustable pads, improving seismic resistance; secondary grouting enhances overall integrity and reduces the risk of structural damage under seismic loads; and the use of precast mechanisms, compared to traditional cast-in-place production, not only reduces on-site pouring and curing time but also shortens the construction cycle by more than 40%.

[0043] The overall structure boasts high connection precision, with controllable pre-embedded bolt position deviation ≤ ±2mm and elevation error ≤ ±1mm. Adjustable shims ensure precise installation elevation, eliminating the need for adjustments after overall equipment installation; simultaneously, they increase the shear strength of connection nodes by over 35%, effectively resisting equipment vibration and impact loads. Secondary grouting ensures no construction gaps, preventing water seepage and steel corrosion, thus improving durability. It reduces on-site labor and material waste, lowering overall construction costs by approximately 15%; and shortens the construction period, allowing for earlier production.

[0044] A construction method for a connection device between a prefabricated building structure and a base, using the connection device described above, includes the following steps:

[0045] S1. At the connection between the cast-in-place base 20 and the prefabricated structure 10, a reserved opening 21 with a longitudinal cross section of V-shape is constructed, and grouting is performed on it for the first time to form a cast-in-place base 20 with a reserved opening 21 of V-shape; wherein, the reserved opening 21 is formed by casting with a customized conical wooden template.

[0046] S2. Several adjustable pads 30 are set between the cast-in-place base 20 and the precast mechanism 10 to adjust the elevation of the precast mechanism 10.

[0047] S3. One end of the vertical steel bar 40 is bent and anchored in the cast-in-place base 20, and the other end is threaded and passed through the reserved hole 11 of the prefabrication mechanism 10, and fixed by steel shims and double nuts 41.

[0048] S4. Secondary grouting is performed in the gap between the cast-in-place base 20 and the precast structure 10, as well as in the reserved channel 11, to form a secondary grouting layer 50, so that the precast structure 10 and the cast-in-place base 20 are connected as one unit, and the reinforcing steel 40 and the nut 41 are completely covered; the secondary grouting is made of high-strength grouting material.

[0049] The connection device between a precast building structure and its base designed in this application enhances the overall integrity of the connection between the precast structure and the cast-in-place base through a pre-reserved opening design with an eight-shaped structure. An adjustable pad is used to solve the elevation problem caused by unevenness on the surface of the cast-in-place base. Simultaneously, a rigid connection is formed through vertical reinforcement and secondary grouting, improving the joint strength. The overall structural design is simple and reasonable, not only expanding the connection contact surface and increasing the interlocking area between new and old concrete to improve shear resistance, but also ensuring the accurate elevation of the precast structure. The entire load-bearing system uses rigid connections, which also protects the reinforcement and connecting nuts from corrosion.

[0050] The embodiments of this application have been described in detail above. These descriptions are merely preferred embodiments and should not be construed as limiting the scope of this application. All equivalent variations and modifications made within the scope of this application should still fall within the patent coverage of this application.

Claims

1. A connection device between a prefabricated building structure and a base, characterized in that, include: The prefabricated structure is a molded structure, and its interior has several reserved channels along its height direction; The cast-in-place base has a reserved opening at its upper end for connection with the prefabrication mechanism, and the longitudinal section of the reserved opening is constructed as a figure-eight structure. An adjustable pad is provided between the precast mechanism and the cast-in-place base to adjust the elevation of the precast mechanism; The reinforcing bars pass through the duct and the adjustable pad and are anchored in the cast-in-place base. Secondary grouting is performed in the gap between the cast-in-place base and the precast structure, as well as in the reserved channels, to form a secondary grouting layer, so that the precast structure and the cast-in-place base are connected as one unit.

2. The connection device between a prefabricated building structure and a base according to claim 1, characterized in that, The longitudinal section of the prefabrication mechanism is an inverted T-shaped structure, and its lower end face is provided with a boss surface; the maximum circumscribed circle diameter of the boss surface is smaller than the minimum inscribed circle diameter of the reserved opening.

3. A connection device between a prefabricated building structure and a base according to claim 1 or 2, characterized in that, The channel extends through the height of the prefabrication mechanism, and its upper surface is constructed as a stepped surface.

4. The connection device between a prefabricated building structure and a base according to claim 3, characterized in that, The upper end face of the reinforcing bar is fixed to the step surface by a nut.

5. The connection device between a prefabricated building structure and a base according to claim 4, characterized in that, The secondary grouting layer covers the nut and is flush with the top surface of the prefabrication mechanism.

6. The connection device between a prefabricated building structure and a base according to claim 3, characterized in that, The lower end face of the reinforcing bar is constructed in an L-shape and is bent and anchored in the cast-in-place base.

7. A connection device between a prefabricated building structure and a base according to any one of claims 1-2 and 4-6, characterized in that, The angle between the two inclined sides of the longitudinal section of the reserved opening is the same, and the angle is not less than 90° and greater than 30°.

8. The connection device between a prefabricated building structure and a base according to claim 7, characterized in that, The adjustable pad is disposed on the lower surface of the prefabrication mechanism and located within the reserved opening.

9. A connection device between a prefabricated building structure and a base according to claim 8, characterized in that, At least one set of the adjustable pads is provided below each of the channels, and each set has at least two of the adjustable pads.

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