Connecting device for prefabricated mechanism and base for building and construction method

Abstract

The invention discloses a connecting device for a prefabricated mechanism and a base for a building and a construction method, and the connecting device comprises the prefabricated mechanism which is of a formed structure, and a plurality of reserved hole channels are formed in the prefabricated mechanism in the height direction of the prefabricated mechanism; a reserved opening connected with the prefabricated mechanism is formed in an upper end opening of the cast-in-place base, and the longitudinal section of the reserved opening is of a splayed structure; the adjustable base plate is arranged between the prefabricating mechanism and the cast-in-place base and used for adjusting the elevation of the prefabricating mechanism; the reinforcing steel bar penetrates through the hole channel and the adjustable base plate and is anchored in the cast-in-place base; and secondary grouting is conducted on the gap between the cast-in-place base and the prefabricated mechanism and the interior of the reserved hole channel, a secondary grouting layer is formed, and therefore the prefabricated mechanism and the cast-in-place base are connected into a whole. The overall structural design is simple and reasonable, the connecting contact face is enlarged, the concrete occlusion area between different structures is increased, and the shear capacity is improved; and the whole stress system adopts rigid connection, so that the strength is high.

Description

Technical Field

[0001] This application belongs to the field of building design and construction, and is particularly applicable to scenarios such as metallurgical engineering and industrial plants that require reliable connections between large equipment foundations and cast-in-place bases. This technology can be widely applied to the connection construction between precast components and cast-in-place structures, especially for projects with high requirements for construction accuracy and connection strength. Background Art

[0002] In traditional building construction, large equipment foundations are usually constructed by cast-in-place methods, which have problems such as long construction periods and difficult control of the accuracy of embedded bolts. Although precast component technology can improve construction efficiency and quality, the connection between precast components and cast-in-place bases has always been a technical difficulty. In particular, the integrity of the connection between the cast-in-place base and the precast component is poor, and there are deficiencies in resisting loads such as the self-weight and vibration of equipment. In addition, the uneven surface of the cast-in-place base will cause it difficult to accurately control the elevation of the precast component, affecting subsequent equipment installation. Summary of the Invention

[0003] This application provides a connection device and construction method for a precast mechanism and a base in construction, which solves the technical problems of insufficient integrity of connection nodes, poor durability and seismic performance in the prior art.

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

[0005] A connection device for a precast mechanism and a base in construction, comprising:

[0006] A precast mechanism, which is a formed structure, and there are a number of reserved holes arranged along its height direction inside it;

[0007] A cast-in-place base, the upper port of which is constructed with a reserved opening for connecting with the precast mechanism, and the longitudinal section of the reserved opening is constructed as an inverted V-shaped structure;

[0008] An adjustable cushion plate, which is arranged between the precast mechanism and the cast-in-place base and is used to adjust the elevation of the precast mechanism;

[0009] Steel bars, which pass through the holes and the adjustable cushion plate and are anchored in the cast-in-place base;

[0010] Secondary grouting is carried out into the gap between the cast-in-place base and the precast mechanism and the reserved holes to form a secondary grouting layer, so that the precast mechanism and the cast-in-place base are connected as a whole.

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

[0012] Further, the duct runs through the height of the prefabrication mechanism, and its upper end face is configured as a stepped surface.

[0013] Further, the upper end face of the steel bar is fixed on the stepped surface by a nut.

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

[0015] Further, the lower end face of the steel bar is configured as an L-shaped structure and is bent and anchored in the cast-in-place base.

[0016] Further, the included angles of the two hypotenuses on both 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] Further, the adjustable cushion plate is disposed on the lower bottom surface of the prefabrication mechanism and is located within the reserved opening.

[0018] Further, at least one set of the adjustable cushion plates is arranged below each duct, and each set has at least two adjustable cushion plates.

[0019] A construction method for a connecting device between a building prefabrication mechanism and a base, using the connecting device as described above, the steps include:

[0020] S1. Pour a reserved opening with a longitudinal section in an eight-shaped structure at the connection position between the cast-in-place base and the prefabrication mechanism; the reserved opening is formed by pouring with a customized tapered wooden formwork;

[0021] S2. Arrange a plurality of the adjustable cushion plates between the cast-in-place base and the prefabrication mechanism to adjust the elevation of the prefabrication mechanism;

[0022] S3. Bend and anchor one end of the vertical steel bar in the cast-in-place base, thread the other end and pass it through the reserved duct of the prefabrication mechanism, and fix it with a steel gasket and a double nut;

[0023] S4. Perform secondary grouting in the gap between the cast-in-place base and the prefabrication mechanism and in the reserved duct to form a secondary grouting layer, so that the prefabrication mechanism and the cast-in-place base are connected as a whole, and the steel bar and the nut are completely covered; the secondary grouting is made of high-strength grouting material.

[0024] Using a connecting device between a building prefabrication mechanism and a base designed by the present application, the eight-shaped reserved opening, the vertical steel bar and the adjustable cushion plate jointly form a flexible-rigid composite connection, improving the connection integrity, connection strength and the overall seismic resistance; the structural design is simple and reasonable, not only expanding the connection contact surface, increasing the concrete biting area between different structures, and improving the shear resistance. The present application also provides a construction method using this connecting device. Brief Description of the Drawings

[0025] Figure 1 is a schematic structural view of a connecting device between a prefabricated mechanism for construction and a base in the present application;

[0026] Figure 2 is an enlarged view of part A in the present application;

[0027] Figure 3 is a schematic structural view after the first grouting in the present application;

[0028] Figure 4 is a schematic structural view after the second grouting in the present application;

[0029] Figure 5 is a top view of one of the connecting devices in the present application;

[0030] Figure 6 is a top view of another connecting device in the present application.

[0031] In the figure:

[0032] 10. Prefabricated mechanism 11. Duct 20. Cast-in-place base

[0033] 21. Reserved opening 30. Adjustable shim 40. Steel bar

[0034] 41. Nut 50. Secondary grouting layer Detailed Description of the Preferred Embodiment

[0035] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] This embodiment provides a connecting device between a prefabricated mechanism for construction and a base, as Figure 1As shown in the figure, it includes a prefabricated mechanism 10 processed and completed in a prefabrication factory, a cast-in-place base 20 directly grouted and cast on-site for the first time, an adjustable cushion plate 30 for adjusting the elevation of the prefabricated mechanism 10, and vertical steel bars 40 for connecting the prefabricated mechanism 10 and the cast-in-place base 20. Among them, the prefabricated mechanism 10 is a formed structure, and a number of reserved channels 11 are provided inside along its height direction; a reserved opening 21 for connecting with the prefabricated mechanism 10 is constructed at the upper port of the cast-in-place base 20, and the longitudinal section of the reserved opening 21 is constructed as an inverted trapezoid structure; the adjustable cushion plate 30 is arranged in the reserved opening 21 between the prefabricated mechanism 10 and the cast-in-place base 20; the steel bars 40 pass through the channels 11 and the adjustable cushion plate 30 and are anchored in the cast-in-place base 20. Secondary grouting is carried out into the gap between the cast-in-place base 20 and the prefabricated mechanism 10, as well as into the reserved channels 11 to form a secondary grouting layer 50, so that the prefabricated mechanism 10 and the cast-in-place base 20 are connected as a whole. The cooperation between the reserved opening and the prefabricated mechanism, as well as the adjustable cushion plate and the prefabricated mechanism 10 forms a flexible adjustment; the connection between the vertical steel bars and the cast-in-place mechanism and the prefabricated mechanism, as well as the operation of the secondary grouting makes the cast-in-place mechanism and the prefabricated mechanism form a rigid connection. This flexible-rigid composite connection formed by the inverted trapezoid reserved opening, vertical steel bars and adjustable cushion plate can not only solve the technical problems of insufficient integrity in the connection between the cast-in-place base 20 and the prefabricated component 10, difficult elevation control of the prefabricated component 10 due to the uneven surface of the cast-in-place base 20, and complex construction of the traditional connection method; but also ensure the accuracy of embedded bolts, improve the overall ability to resist dynamic loads; and can also improve the durability and seismic performance of the connection nodes.

[0037] In this embodiment, the maximum cross-sectional area of the prefabricated mechanism 10 is smaller than the minimum cross-sectional area of the reserved opening 21, so as to ensure 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 lower bottom surface of the prefabricated mechanism 10 is provided with a convex platform extending outwards to improve the stability of the base of the prefabricated mechanism 10, and the height of the convex platform 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 column or a quadrilateral column, and the lower convex platform thereof can be a circular structure, a polygon or a quadrilateral structure.

[0038] As long as the maximum circumscribed circle diameter of the convex platform meets the requirement that it is smaller than the minimum inscribed circle diameter of the reserved opening 21, so that there is a gap between the prefabricated mechanism 10 and the cast-in-place base 20, which is convenient for secondary grouting to form a secondary grouting layer 50 and improve the connection strength. The prefabricated mechanism 10 is processed in the factory to ensure the accuracy of embedded bolts, and also shortens the on-site construction time by more than 40%, and the position deviation of the embedded bolts can be controlled within ±2mm.

[0039] Such as Figure 2 、 4As shown, the duct 11 is provided through the height of the prefabrication mechanism 10, and its upper end face is configured as a stepped surface, so as to facilitate the fixed installation of the upper end face of the steel bar 40 on the top of the prefabrication mechanism 10 through the nut 41, and cover the steel bar 40 and the nut 41 during the secondary grouting, so as to protect the steel 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 prefabrication mechanism 10 to improve the appearance of the prefabrication mechanism 10.

[0040] As Figure 4 shown, it is the secondary grouting layer 50 formed after secondary grouting. The secondary grouting fills all voids with high-strength grouting material to form an overall stress-bearing system, and at the same time protects the steel bars and nuts from corrosion. The secondary grouting not only improves the integrity and seismic performance of the connection joints; but also can prevent the steel bars and nuts from rusting, improve durability, enhance the load transfer capacity, reduce stress concentration, and also enhance the reliability of the quality.

[0041] As Figure 3 shown, it is the structure of the cast-in-place base 20 after the first grouting and pouring on site, forming a cast-in-place base 20 with a figure-eight structure. The reserved opening at this connection uses a figure-eight, that is, an outward-expanded conical structure, which expands the contact area of the concrete and enhances the mechanical biting force and shear resistance. It can not only increase the bonding area of the concrete and improve the shear bearing capacity; but also prevent the connection from cracking due to stress concentration and improve the seismic performance of the overall structure. Preferably, the included angles of the two hypotenuses on the longitudinal section of the reserved opening 21 are the same, and it is formed by pouring with a customized conical formwork; and its angle is not less than 90° and greater than 30°. Through the reserved opening 21 structure in the shape of a figure-eight, by expanding the connection contact surface and increasing the biting area of the concrete, the shear resistance is improved, and then the connection integrity and connection strength between the prefabrication mechanism 10 and the cast-in-place base 20 can be enhanced.

[0042] One end of the vertical steel bar 40 is bent and anchored in the cast-in-place base 20 to improve the anti-pulling force; the other end is threaded and passes through the reserved duct 11 of the prefabrication mechanism 10, and is locked and fixed through a steel gasket and a double nut 41 to form a rigid connection. Preferably, the lower end face of the steel bar 40 is configured as an L-shaped structure, which is directly inserted into the cast-in-place base 20 and bent and anchored in the cast-in-place base 20 to prevent the steel bar from slipping. The top of each steel bar 40 is fixed by a gasket and two stacked nuts 41, and they are all recessed in the stepped surface. By adopting the connection method of the vertical steel bar 40, not only the shear and bending resistance can be improved; but also after grouting into the reserved duct 11, the steel bar and the concrete form an overall stress-bearing system, improving its anti-deformation ability.

[0043] An adjustable cushion plate 30 is arranged between the cast-in-place base 20 and the prefabricated mechanism 10. By adjusting the thickness of the cushion plate, the unevenness of the surface of the cast-in-place base 20 is compensated to ensure the accurate installation elevation of the prefabricated mechanism 10. Among them, the adjustable cushion plate 30 is configured on the lower bottom surface of the prefabricated mechanism 10 and is located within the reserved opening 21. Preferably, at least one set of adjustable cushion plates 30 is arranged below each duct 11, and each set has at least two adjustable cushion plates 30. The number of adjustable cushion plates 30 in all sets is the same, aiming to synchronously adjust the elevation of the prefabricated mechanism 10. Through the adjustment of the thickness of the adjustable cushion plate 30, the construction error of the surface of the cast-in-place base is compensated, thereby solving the elevation problem caused by the uneven surface of the cast-in-place base 20, ensuring the accurate elevation of the prefabricated mechanism 10, and making the elevation error ±1 mm. It can not only eliminate the influence of cast-in-place construction errors on equipment installation, but also ensure the levelness of the prefabricated mechanism 10, avoid uneven stress after equipment installation, improve construction efficiency, and reduce on-site leveling operations.

[0044] As Figures 5 - 6 shown, they are all top views of the prefabricated mechanism 10. Based on the cross-sectional schematic diagram of the prefabricated mechanism 10, the top view of the corresponding reserved opening 21 is adapted to the prefabricated mechanism 10. At the same time, the number of ducts 11 is symmetrically arranged along the cross-section of the prefabricated structure 10 or evenly arranged along its diametral plane.

[0045] As Figure 5 shown, both the prefabricated mechanism 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 cushion plates 30 are arranged below the cast-in-place base 20. The number of components of the adjustable cushion plates 30 in the inner layer is the same as the number of ducts 11, both being four; the number of components of the adjustable cushion plates 30 in the outer layer is six.

[0046] As Figure 6 shown, the body of the prefabricated mechanism 10 is a cylindrical structure, and the convex table surface of its lower bottom surface is a square structure; the cast-in-place base 20 is a square structure. Correspondingly, the reserved opening 21 is a frustum-shaped structure. Correspondingly, two layers of adjustable cushion plates 30 are arranged below the cast-in-place base 20. The number of components of the adjustable cushion plates 30 in the inner layer is the same as the number of ducts 11, both being four and located on the same circle; the number of components of the adjustable cushion plates 30 in the outer layer is four and is symmetrically arranged.

[0047] Through the innovative design of connection nodes and construction methods, this application effectively solves the technical problems of the connection between prefabricated components and cast-in-place bases, providing reliable technical support for building industrialization. The flexible-rigid composite connection is formed by the eight-shaped reserved opening, vertical steel bars, and adjustable cushion plates to improve the seismic resistance; the secondary grouting can enhance the integrity and reduce the risk of structural damage under earthquake action; the use of prefabricated mechanisms instead of traditional cast-in-place production methods not only reduces on-site pouring and curing time, but also shortens the construction period by more than 40%.

[0048] The connection accuracy of the overall structure is high. The position deviation of the embedded bolts can be controlled within ≤±2 mm, and the elevation error is ≤±1 mm. The adjustable shims can ensure accurate installation elevation and avoid readjustment after the overall equipment is installed. At the same time, the shear strength of the connection joints is increased by more than 35%, which can effectively resist equipment vibration and impact loads. The secondary grouting ensures no construction joints, avoids water seepage and steel bar corrosion, and improves durability. It reduces on-site labor and material waste, and the comprehensive construction cost is reduced by about 15%. The construction period is shortened and production is advanced ahead of schedule.

[0049] A construction method for a connecting device between a prefabricated structure and a base for construction uses the connecting device as described above. The steps include:

[0050] S1. At the connection position between the cast-in-place base 20 and the prefabricated structure 10, a reserved opening 21 with a longitudinal section in an inverted V-shaped structure is built and first grouted to form a cast-in-place base 20 with a reserved opening 21 in an inverted V-shaped structure. Among them, the reserved opening 21 is formed by pouring with a customized tapered wooden formwork.

[0051] S2. A number of adjustable shims 30 are arranged between the cast-in-place base 20 and the prefabricated structure 10 to adjust the elevation of the prefabricated structure 10.

[0052] 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 prefabricated structure 10 and fixed by a steel gasket and a double nut 41.

[0053] S4. Secondary grouting is carried out in the gap between the cast-in-place base 20 and the prefabricated structure 10 and in the reserved hole 11 to form a secondary grouting layer 50, so that the prefabricated structure 10 and the cast-in-place base 20 are connected as a whole, and the steel bar 40 and the nut 41 are completely covered. The secondary grouting is made of high-strength grouting material.

[0054] Using a connecting device between a prefabricated structure and a base for construction designed in this application, through the design of the reserved opening in an inverted V-shaped structure, the connection integrity between the prefabricated structure and the cast-in-place base can be enhanced. The adjustable shims are used to solve the elevation problem caused by the uneven surface of the cast-in-place base. At the same time, a rigid connection is formed through the vertical steel bar and secondary grouting to improve the joint strength. The overall structure design is simple and reasonable. It not only expands the connection contact surface, increases the biting area of new and old concrete, and improves the shear resistance, but also can ensure the accurate elevation of the prefabricated structure. The overall force system uses rigid connections, which can also protect the steel bars and connection nuts from corrosion.

[0055] The above has described the embodiments of the present application in detail. The above content is only the preferred embodiment of the present application and cannot be considered as limiting the implementation scope of the present application. All equivalent changes and improvements made according to the scope of the present application should still fall within the patent coverage scope of the present application.

Claims

1. A connecting device for a prefabricated mechanism and a base in construction, characterized in that, Including: A prefabrication mechanism, which is a formed structure, and several reserved channels are arranged inside it along its height direction; A cast-in-place base, the upper port of which is constructed with a reserved opening connected to the prefabrication mechanism, and the longitudinal section of the reserved opening is constructed as an octagonal structure; Adjustable cushion plates, which are arranged between the prefabrication mechanism and the cast-in-place base for adjusting the elevation of the prefabrication mechanism; Steel bars, which pass through the channels and the adjustable cushion plates and are anchored in the cast-in-place base; Secondary grouting is carried out into the gap between the cast-in-place base and the prefabrication mechanism and into the reserved channels to form a secondary grouting layer, so that the prefabrication mechanism and the cast-in-place base are connected as a whole.

2. The connecting device between a prefabrication mechanism for construction and a base according to claim 1, characterized in that, The longitudinal section of the prefabrication mechanism is an inverted T-shaped structure, and a convex table surface is arranged on its lower end surface; the maximum circumscribed circle diameter of the convex table surface is smaller than the minimum inscribed circle diameter of the reserved opening.

3. A connecting device between a prefabrication mechanism for construction and a base according to claim 1 or 2, characterized in that, The channels run through the height of the prefabrication mechanism, and its upper end surface is constructed as a stepped surface.

4. A connecting device between a prefabrication mechanism for construction and a base according to claim 3, characterized in that, The upper end surface of the steel bar is fixed on the stepped surface by a nut.

5. The connecting device between a prefabrication mechanism for construction 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 prefabricated mechanism.

6. The connecting device between a prefabrication mechanism for construction and a base according to claim 3, characterized in that, The lower end surface of the steel bar is constructed as an L-shaped structure and is bent and anchored in the cast-in-place base.

7. A connecting device between a prefabrication mechanism for construction and a base according to any one of claims 1-2, 4-6, characterized in that 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°.

8. A connecting device between a prefabrication mechanism for construction and a base according to claim 7, characterized in that, The adjustable cushion plates are arranged on the lower bottom surface of the prefabrication mechanism and are located within the reserved opening.

9. A connecting device between a prefabrication mechanism for construction and a base according to claim 8, characterized in that, At least one set of the adjustable cushion plates is arranged below each of the channels, and each set has at least two adjustable cushion plates.

10. A construction method of a connecting device between a prefabrication mechanism for construction and a base, characterized in that, Adopting the connecting device according to any one of claims 1-9, the steps include: S1. Pour a reserved opening with an octagonal longitudinal section at the connection position between the cast-in-place base and the prefabrication mechanism; the reserved opening is formed by pouring with a customized tapered wooden formwork; S2. Arrange several adjustable cushion plates between the cast-in-place base and the prefabrication mechanism to adjust the elevation of the prefabrication mechanism; S3. Bend and anchor one end of the vertical steel bar in the cast-in-place base, thread the other end and pass it through the reserved channels of the prefabrication mechanism, and fix it with a steel gasket and a double nut; S4. Carry out secondary grouting into the gap between the cast-in-place base and the prefabrication mechanism and into the reserved channels to form a secondary grouting layer, so that the prefabrication mechanism and the cast-in-place base are connected as a whole and the steel bar and the nut are completely covered; the secondary grouting is made of high-strength grouting material.

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