Method for assembling strip-shaped foundation under column

Abstract

The invention relates to the technical field of engineering, in particular to an under-column strip foundation assembly method which comprises the steps that a plurality of precast blocks are arranged, a plurality of prestressed ducts are formed in the precast blocks in the length direction in a penetrating mode, and the positions of the prestressed ducts in the precast blocks correspond to each other; the prefabricated blocks are sequentially connected to form a strip shape, the adjacent prefabricated blocks are connected through mortise and tenon joint structures, prestressed tendons penetrate through the prestressed hole channels, and the prefabricated blocks are assembled, spliced and consolidated to form the strip-shaped foundation. According to the under-column strip foundation assembly method, the technical route and principle are clear, the structure is simple, construction is convenient and fast, and feasibility is high; the strip-shaped foundation can be cyclically used, and the cost investment is saved through long-term consideration; the strip-shaped foundation is prevented from being dismantled to generate solid waste; standardized construction is facilitated, and repeated design cost is saved; the market scale is large and the popularization and application prospect is wide.

Description

Technical Field

[0001] The invention relates to the field of engineering technology, in particular to an assembly method of a strip foundation under a column. Background Art

[0002] The beam-column support is a common and universal formwork measure for concrete pouring. The force system of its foundation and supporting columns has been studied maturely. The domestic "Strip Foundation under Column" chapter of "Code for Design of Building Foundations" GB500007 has clear requirements for it. As the foundation of the beam-column support, its cross-section is commonly rectangular, two-level rectangular, trapezoidal, etc., with steel bars inside, and connecting anchor screws or pre-buried welded steel plates at the column position. It is mostly formed on site according to the same process as permanent engineering.

[0003] As a temporary construction measure, the traditional strip foundation is formed by pouring and curing concrete on site. After the strength of the upper concrete structure reaches the design requirements, the beam-column support is removed, and the strip foundation loses its function and value. It is often mechanically crushed and transported to a special waste dump for disposal. It has the disadvantages of short service life, non-recyclability, and solid waste pollution, which does not conform to my country's green and low-carbon construction concept. Summary of the invention

[0004] The purpose of the present invention is to provide a method for assembling strip foundations under columns in view of the fact that traditional strip foundations in the prior art are formed by pouring and solidifying concrete on site, which are often mechanically crushed and then transported to a special slag site for disposal. The method has the problems of short service life, non-recyclability, and solid waste polluting the environment.

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

[0006] In a first aspect, the present application provides a method for assembling a strip foundation under a column.

[0007] A plurality of prefabricated blocks are provided, wherein a plurality of prestressed channels are provided through the prefabricated blocks along the length direction, and the positions of the prestressed channels on each of the prefabricated blocks are provided correspondingly;

[0008] The prefabricated blocks are sequentially connected to form a strip shape, and adjacent prefabricated blocks are connected by a mortise and tenon structure. Prestressed tendons pass through the prestressed channels to assemble and consolidate the prefabricated blocks into a strip foundation.

[0009] The method for assembling strip foundations under columns described in the present invention has clear technical routes and principles, simple structure, convenient construction and high feasibility; it can realize the recycling of strip foundations, saving cost investment in the long run; it is green and low-carbon, avoiding the generation of solid waste by dismantling strip foundations; it is convenient for standardized construction and saves repeated design costs; it has a large market scale and broad prospects for promotion and application.

[0010] As a preferred technical solution of the present invention, the prefabricated blocks include column foundation connection blocks, standard connection blocks, and adjustment blocks.

[0011] As a further preferred technical solution of the present invention, a steel anchor is arranged on the top of the column foundation connection block, and an embedded part is arranged in the column foundation connection block. The embedded part is connected to the steel anchor, and the steel anchor is used to connect the column.

[0012] As a preferred technical solution of the present invention, the mortise and tenon structure includes a tenon and a tenon groove, and the tenon and the tenon groove are respectively arranged at two ends of the prefabricated block in the length direction.

[0013] As a preferred technical solution of the present invention, the cross section of the prefabricated block is rectangular, U-shaped, trapezoidal, or a combination of an upper trapezoid and a lower rectangle.

[0014] As a preferred technical solution of the present invention, the prestressed channels are symmetrically arranged along the vertical center line of the prefabricated block section.

[0015] As a preferred technical solution of the present invention, the method for assembling the strip foundation under the column comprises the following steps:

[0016] S1. Statistical analysis of the types of beam-column support strip foundation structures in the industry;

[0017] S2. Design a general strip foundation according to the requirements of GB500007 Code for Design of Building Foundations;

[0018] S3. Design the steel anchors connecting the strip foundation and the columns;

[0019] S4. Divide the designed universal strip foundation into assembly sections, including column foundation connection section, standard section, and adjustment section;

[0020] S5. Design the mortise and tenon joints, prestressed holes, prestressed tendon specifications and applied tightening force of the connection occlusal surface;

[0021] S6. Design a monitoring plan and bury stress sensors and displacement observation devices.

[0022] Centralized intelligent management and control is achieved through the deployment of sensors and information technology, laying a good foundation for access to digital infrastructure projects.

[0023] As a further preferred technical solution of the present invention, the steel anchor is connected to the column by flange connection or welding.

[0024] As a further preferred technical solution of the present invention, the steel anchor is connected to the strip foundation via anchor bolts.

[0025] As a further preferred technical solution of the present invention, the prestressed duct is arranged according to the "Design Code for Prestressed Concrete Structures" JGJ369, and the tensioning force of the prestressed tendons is determined by finite element analysis.

[0026] In a second aspect, the present application also provides an assembled strip foundation under a column, which is formed using the assembly method of the strip foundation under a column as described in any of the above items.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] The method for assembling strip foundations under columns described in the present invention has clear technical routes and principles, simple structure, convenient construction and high feasibility; it can realize the recycling of strip foundations, saving cost investment in the long run; it is green and low-carbon, avoiding the generation of solid waste by the dismantling of strip foundations; it is convenient for standardized construction and saves repeated design costs; it has a large market scale and broad prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the plane structure of the strip foundation under the assembled column;

[0030] Figure 2 This is a schematic diagram of the elevation structure of the strip foundation under the assembled column;

[0031] Figure 3 It is a schematic diagram of the cross-sectional structure of the strip foundation under the prefabricated column.

[0032] Markings in the figure: 1-prefabricated block, 2-prestressed channel, 3-mortise and tenon structure, 4-embedded parts, 5-steel anchor. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0034] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0036] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0037] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0038] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0039] In the related art, the piers and beams of a T-shaped rigid frame bridge are consolidated, and the seismic force is mainly borne by the piers under the action of an earthquake. Once the piers of a T-shaped rigid frame bridge are plastically damaged under the action of an earthquake, it is difficult to repair and reset them. At the same time, the main beam will be greatly displaced, resulting in an unfavorable state where the end of the main beam hits the abutment. For this reason, the technical solution of this application is produced, and the following is combined with Figures 1 to 3 To elaborate.

[0040] Example 1

[0041] like Figures 1 to 3 As shown, the method for assembling a strip foundation under a column according to the present invention comprises the following steps:

[0042] S1. Statistical analysis of the types of beam-column support strip foundation structures in the industry. There is no unified standard requirement for the strip foundation under the column. Construction units often use rectangular, convex, trapezoidal, or upper trapezoidal and lower rectangular structures for the convenience of construction (such as Figure 3 The strip foundation under the column is composed of multiple prefabricated blocks 1 (as shown in Figure 1 and Figure 2 As shown in the figure, its size is related to the specific construction conditions. For the design of the cross-sectional dimensions of the strip foundation, the cross-sectional dimensions of the column, the design value of the load at the bottom of the column, and the allowable value of the bearing capacity at the bottom of the foundation should be determined according to the specific construction conditions, and then the thickness, top surface and bottom surface width of the strip foundation under the column with wide applicability should be obtained by referring to the requirements of the "Code for Design of Building Foundations" GB500007.

[0043] S2. Design universal strip foundation according to the requirements of GB500007 "Code for Design of Building Foundations", taking into account the requirements of wide range of applicable column types and light structure.

[0044] S3. Design the steel anchor 5 connecting the strip foundation and the column, which is required to cover the commonly used column models. Depending on the specific working conditions, the cross-sectional dimensions of the column are varied. To achieve reliable consolidation between the column and the strip foundation, an embedded part 4 is embedded in the strip foundation during prefabrication. The embedded part 4 can be anchor bolts. The lower end of the steel anchor 5 needs to be matched and anchored with the anchor bolts, and the upper end of the steel anchor 5 needs to be connected to the column. The connection form can be flange connection or welding connection.

[0045] S4. Divide the designed universal strip foundation into assembly sections, including column foundation connection sections, standard sections, and adjustment sections. That is, the strip foundation after division actually includes column foundation connection blocks, standard connection blocks, and adjustment blocks, and the embedded parts 4 are arranged in the column foundation connection blocks. The key to this node is the division of the column and strip foundation connection sections, which must meet the connection function requirements and keep the section length as short as possible to reduce the weight of the section; the principle of dividing the standard section and the adjustment section is mainly based on the convenience of transportation and installation.

[0046] S5, design the male and female tenons of the connection occlusal surface of the prefabricated block 1, the prestressed channel 2, the specifications of the prestressed tendons and the applied tightening force. Figure 2As shown, the mortise and tenon structure 3 includes a tenon and a tenon groove, which bears the cross-sectional shear force. The tenon and the tenon groove are respectively arranged at both ends of the length direction of the prefabricated block 1, and the adjacent prefabricated blocks 1 are connected by the mortise and tenon structure 3. The prefabricated block 1 is provided with a plurality of prestressed channels 2 along the length direction, and the positions of the prestressed channels 2 on each prefabricated block 1 are arranged correspondingly. The prefabricated blocks 1 are sequentially connected into strips, and the prestressed tendons pass through the prestressed channels 2 to assemble and consolidate the prefabricated blocks 1 into a strip foundation. According to the "Design Code for Prestressed Concrete Structures" JGJ369, the prestressed channels 2 are reasonably studied and arranged, and the tensioning force of the prestressed tendons is determined by finite element analysis to ensure that the strip foundation is subjected to stress as a whole.

[0047] In this embodiment, Figure 3 As shown, two upper and lower rows of prestressed channels 2 are arranged on the section of the prefabricated block 1 , and the prestressed channels 2 are symmetrically arranged along the vertical center line of the section of the prefabricated block 1 .

[0048] S6. Based on the monitoring requirements of strip foundation stress, settlement, slippage, etc., design a monitoring plan, bury stress sensors and displacement observation devices in advance, and realize digital management and control.

[0049] S7. Select projects for demonstration applications, optimize and iterate, and promote application.

[0050] The beneficial effects and advantages of the method for assembling strip foundations under columns described in this embodiment are mainly reflected in six aspects: 1. The technical route and principle are clear, the structure is simple, the construction is convenient, and the feasibility is high; 2. The strip foundation can be recycled, which saves cost investment in the long run; 3. It is green and low-carbon, avoiding the generation of solid waste by the demolition of the strip foundation; 4. It is convenient for standardized construction and saves repeated design costs; 5. Centralized intelligent management and control are realized through sensor deployment and information technology, which lays a good foundation for access to digital infrastructure projects; 6. The market scale is large and the prospects for promotion and application are broad.

[0051] Example 2

[0052] like Figures 1 to 3 As shown, the assembled strip foundation under a column described in the present application is formed using the assembly method of the strip foundation under a column as described in Example 1.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for assembling a strip foundation under a column, characterized in that: A plurality of prefabricated blocks (1) are provided, wherein a plurality of prestressed channels (2) are provided through the prefabricated blocks (1) along the length direction, and the positions of the prestressed channels (2) on each of the prefabricated blocks (1) are correspondingly provided; The prefabricated blocks (1) are sequentially connected into a strip shape, adjacent prefabricated blocks (1) are connected via a mortise and tenon structure (3), and prestressed tendons are passed through the prestressed ducts (2) to assemble and consolidate the prefabricated blocks (1) into a strip foundation.

2. The method for assembling the strip foundation under a column according to claim 1, characterized in that: The prefabricated block (1) comprises a column foundation connection block, a standard connection block and an adjustment block.

3. The method for assembling the strip foundation under a column according to claim 2, characterized in that: A steel anchor (5) is arranged on the top of the column foundation connection block, an embedded part (4) is arranged inside the column foundation connection block, the embedded part (4) is connected to the steel anchor (5), and the steel anchor (5) is used to connect the column.

4. The method for assembling the strip foundation under a column according to claim 1, characterized in that: The mortise and tenon structure (3) comprises a tenon and a tenon groove, and the tenon and the tenon groove are respectively arranged at two ends of the prefabricated block (1) in the length direction.

5. The method for assembling the strip foundation under a column according to claim 1, characterized in that: The cross section of the prefabricated block (1) is rectangular, U-shaped, trapezoidal, or a combination of an upper trapezoidal and a lower rectangular shape.

6. The method for assembling the strip foundation under a column according to claim 1, characterized in that: The prestressed ducts (2) are symmetrically arranged along the vertical center line of the cross section of the prefabricated block (1).

7. The method for assembling a strip foundation under a column according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Statistical analysis of the types of beam-column support strip foundation structures in the industry; S2. Design a general strip foundation according to the requirements of GB500007 Code for Design of Building Foundations; S3. Design the steel anchors (5) connecting the strip foundation and the columns; S4. Divide the designed universal strip foundation into assembly sections, including column foundation connection section, standard section, and adjustment section; S5. Design the male and female tenons of the connection occlusal surface, the prestressed hole (2), the specifications of the prestressed tendons and the applied tightening force; S6. Design a monitoring plan and bury stress sensors and displacement observation devices.

8. The method for assembling the strip foundation under a column according to claim 7, characterized in that: The steel anchor (5) is connected to the column via a flange or welding.

9. The method for assembling the strip foundation under a column according to claim 7, characterized in that: The prestressed duct (2) is arranged according to the "Design Code for Prestressed Concrete Structures" JGJ369, and the tensioning force of the prestressed tendons is determined by finite element analysis.

10. An assembled column strip foundation, characterized in that: The strip foundation under the column is formed by using the assembly method of the strip foundation under the column as described in any one of claims 1 to 9.

Images