A three-column combined foundation and an assembling method thereof

Abstract

The application relates to a three-column combined foundation and an assembling method thereof, the three-column combined foundation comprising a lower prefabricated block, a middle prefabricated block, an upper prefabricated block and three prefabricated columns, the lower prefabricated block and the upper prefabricated block each comprising a left prefabricated block and a right prefabricated block, the middle prefabricated block comprising a front prefabricated block and a rear prefabricated block, the bottom of the prefabricated column being fixed on the lower prefabricated block, the middle prefabricated block and the upper prefabricated block being provided with prefabricated column installation channels, post-poured concrete bodies being poured between the prefabricated columns and the prefabricated column installation channels, the left prefabricated block and the right prefabricated block being connected through a plurality of transverse prestressed tendons, the front prefabricated block and the rear prefabricated block being connected through a plurality of longitudinal prestressed tendons, and the lower prefabricated block, the middle prefabricated block and the upper prefabricated block being connected through a plurality of vertically arranged screw rods. The application solves the problems of cast-in-situ concrete foundation construction complexity, long construction period, material waste, great environmental influence and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of prefabricated building structure of concrete foundation, and particularly relates to a three-column combined foundation and an assembling method thereof. BACKGROUND

[0002] The state has introduced a number of policies on building industrialization, and the development of prefabricated buildings is a powerful way to respond to the call of the state policy, and is also a major change in the way of building construction, and is the only way to promote the development of building industrialization.

[0003] The concrete foundation is a key to the safety of a concrete building structure, and in the traditional technology, cast-in-place technology is usually used to form the concrete foundation. The transformer station foundation is a typical concrete foundation, which has a large volume and various forms, including foundation blocks and three columns integrated with the foundation blocks, and the columns are used to support the transformer station support frame on the upper side. During construction, there are a series of problems such as long construction period, resource waste, influence of the site construction environment, and great influence on the environment. SUMMARY

[0004] The present application aims to provide a prefabricated three-column combined foundation to solve the technical problem of long construction period and easy pollution of the environment in the prior art, and also aims to provide an assembling method of the three-column combined foundation.

[0005] To solve the above technical problems, the technical scheme of a three-column combined foundation in the present application is as follows:

[0006] A three-column combined foundation, comprising a lower prefabricated block, a middle prefabricated block, an upper prefabricated block, and three vertically arranged prefabricated columns in a triangular distribution, the lower prefabricated block and the upper prefabricated block each comprise a left prefabricated block and a right prefabricated block assembled together along a left-right direction, the middle prefabricated block comprises a front prefabricated block and a rear prefabricated block assembled together along a front-rear direction, the bottom of the prefabricated column is fixed to the lower prefabricated block, the middle prefabricated block and the upper prefabricated block are provided with prefabricated column installation channels for the corresponding prefabricated columns to vertically penetrate, a post-poured concrete body is poured between the prefabricated column and the prefabricated column installation channel, the left prefabricated block and the right prefabricated block are connected by a plurality of transverse prestressed tendons extending along the left-right direction, the front prefabricated block and the rear prefabricated block are connected by a plurality of longitudinal prestressed tendons extending along the front-rear direction, and the lower prefabricated block, the middle prefabricated block, and the upper prefabricated block are connected by a plurality of vertically arranged screw rods.

[0007] Further, the lower prefabricated block is fixed with three reserved reinforcing bar units respectively used for connecting with corresponding prefabricated columns, each reserved reinforcing bar unit comprises a plurality of vertically arranged reserved reinforcing bars, two reserved reinforcing bar units are symmetrically distributed on the left prefabricated block and the right prefabricated block of the lower prefabricated block, and the other reserved reinforcing bar unit spans the left prefabricated block and the right prefabricated block of the lower prefabricated block.

[0008] Further, the prefabricated column is provided with a prefabricated column transverse channel for the corresponding transverse prestressed steel bars to penetrate in the left-right direction, and is also provided with a prefabricated column longitudinal channel for the corresponding longitudinal prestressed steel bars to penetrate in the front-back direction.

[0009] Further, the lower prefabricated block, the middle prefabricated block and the upper prefabricated block are of the same shape, the front prefabricated block is a trapezoidal plate structure with small back and large front, the rear prefabricated block is a rectangular plate structure, the left prefabricated block and the right prefabricated block are left-right symmetric structures, one of the three prefabricated column installation channels on the middle prefabricated block is distributed on the front prefabricated block, and the other two prefabricated column installation channels are symmetrically distributed on the rear prefabricated block; two of the three prefabricated column installation channels on the upper prefabricated block are symmetrically distributed on the left prefabricated block and the right prefabricated block, and the other prefabricated column installation channel spans the left prefabricated block and the right prefabricated block.

[0010] Further, a plurality of transverse shear keys and shear key groove structures in concave-convex cooperation in the left-right direction are arranged on the splicing surface of the left prefabricated block and the right prefabricated block; a plurality of longitudinal shear keys and shear key groove structures in concave-convex cooperation in the front-back direction are arranged on the splicing surface of the front prefabricated block and the rear prefabricated block.

[0011] Further, the prefabricated column installation channel and the prefabricated column are provided with corresponding protrusions and grooves, and the post-cast concrete body is integrally fixed with the protrusions and the grooves by pouring.

[0012] Further, the contact surfaces between the lower prefabricated block and the middle prefabricated block and the contact surfaces between the middle prefabricated block and the upper prefabricated block are rough surfaces, and a bonding material layer is coated on the rough surfaces; a bonding material layer is coated between the shear keys and the shear key grooves of the transverse shear key and shear key groove structure and between the shear keys and the shear key grooves of the longitudinal shear key and shear key groove structure.

[0013] The technical scheme of the assembly method of the three-column combined foundation in the application is as follows:

[0014] The method comprises the following steps: firstly, assembling the lower prefabricated blocks at the construction site, fixing the left prefabricated block and the right prefabricated block of the lower prefabricated block together through the transverse prestressed tendon; secondly, fixing the three prefabricated columns on the corresponding reserved tendon units of the lower prefabricated block respectively; thirdly, hoisting the front prefabricated block and the rear prefabricated block of the middle prefabricated block, so that the prefabricated columns are distributed along the corresponding prefabricated column installation passages of the middle prefabricated block in the vertical direction, and fixing the front prefabricated block and the right prefabricated block of the middle prefabricated block together through the longitudinal prestressed tendon; fourthly, hoisting the left prefabricated block and the right prefabricated block of the upper prefabricated block, so that the prefabricated columns are distributed along the corresponding prefabricated column installation passages of the upper prefabricated block in the vertical direction, and fixing the left prefabricated block and the right prefabricated block of the upper prefabricated block together through the transverse prestressed tendon; and fifthly, connecting the lower prefabricated block, the middle prefabricated block and the upper prefabricated block together through the plurality of vertically arranged screw rods, and pouring the post-poured concrete body between the prefabricated columns and the prefabricated column installation passages.

[0015] Further, during the assembling process of the lower prefabricated block, the middle prefabricated block and the upper prefabricated block, a bonding material layer is applied between the left prefabricated block and the right prefabricated block, between the front prefabricated block and the rear prefabricated block, and between the contact surfaces of the lower prefabricated block and the middle prefabricated block and the contact surfaces of the middle prefabricated block and the upper prefabricated block.

[0016] Further, in the second step, during hoisting the front and rear prefabricated blocks of the middle layer prefabricated block, three prefabricated column installation channels on the middle layer prefabricated block are defined, one of which is a middle layer first prefabricated column installation channel distributed on the front prefabricated block, and the other two are middle layer second prefabricated column installation channels symmetrically distributed on the left and right sides of the rear prefabricated block. The rear side of the middle layer second prefabricated column installation channel is provided with a channel rear side step groove, and the rear end of the corresponding prefabricated column is provided with a prefabricated column rear side groove arranged opposite to the channel rear side step groove. The front side of the middle layer first prefabricated column installation channel is provided with a channel front side step groove, and the front end of the corresponding prefabricated column is provided with a prefabricated column front side groove arranged opposite to the channel front side step groove. A plurality of longitudinally shear keys and shear key grooves in front and back direction are arranged on the splicing surface of the front and rear prefabricated blocks. The longitudinally shear key and the longitudinally shear key groove include a longitudinally shear key and a longitudinally shear key groove. First, the rear prefabricated block is sleeved on the corresponding prefabricated column, the front side wall of the middle layer second prefabricated column installation channel is in contact with the front side wall of the corresponding prefabricated column, the front prefabricated block is sleeved on the corresponding prefabricated column, and the rear side wall of the middle layer first prefabricated column installation channel is in contact with the rear side wall of the corresponding prefabricated column. The distance between the longitudinally shear key and the longitudinally shear key groove is 2L. The distance between the rear side wall of the middle layer second prefabricated column installation channel and the rear side wall of the corresponding prefabricated column is 2L. The front and back depth of the channel rear side step groove is L. The front and back depth of the prefabricated column rear side groove is L. The front and back distance between the channel rear side step groove and the prefabricated column rear side groove is 4L. The rear side steel reinforcement cage with a front and back width of 3L is placed on the channel rear side step groove.

[0017] Subsequently, the rear prefabricated block is pushed forward by a distance of L, and the front prefabricated block is pushed backward by a distance of L. The top of the longitudinally shear key is in contact with the groove bottom of the longitudinally shear key groove. The front end of the rear steel reinforcement cage is in contact with the groove bottom of the prefabricated column rear side groove. The rear end of the front steel reinforcement cage is in contact with the groove bottom of the prefabricated column front side groove.

[0018] In the fourth step, the corresponding rear cast concrete body is respectively poured and fixed with the front and rear steel reinforcement cages to form an integral structure.

[0019] The beneficial effects of the present application are: in the present application, the three-column combined foundation of cast-in-place structure is changed into prefabricated structure, specifically, the three-column combined foundation is divided into lower prefabricated blocks, middle prefabricated blocks, upper prefabricated blocks and three vertically arranged prefabricated columns, the lower prefabricated blocks and the upper prefabricated blocks are further divided into left prefabricated blocks and right prefabricated blocks, and the middle prefabricated blocks are divided into front prefabricated blocks and right prefabricated blocks, each prefabricated block is prefabricated in a factory and transported to the site for assembly, during the assembly, the lower prefabricated blocks are assembled first, then the prefabricated columns and the lower prefabricated blocks are connected, and then the middle prefabricated blocks and the upper prefabricated blocks are assembled in sequence, the assembly of each layer of prefabricated blocks is realized through prestressed reinforcement, and the assembly between each layer of prefabricated blocks is realized through a screw rod, which is very convenient, the site pouring workload is small, and the environment is not easy to pollute. BRIEF DESCRIPTION OF DRAWINGS

[0020] The above and other objects, features and advantages of the disclosed example embodiments will become more apparent from the following detailed description, read in conjunction with the accompanying drawings. In the drawings, several embodiments of the disclosure are illustrated by way of example and not limitation in which like reference numerals represent similar, or corresponding parts throughout the several views, wherein:

[0021] Figure 1 is a structural schematic diagram of embodiment 1 of the three-column combined foundation in the present application;

[0022] Figure 2 is a top view of Figure 1 ;

[0023] Figure 3 is a side view of Figure 1 ;

[0024] Figure 4 is a 1-1 sectional view in Figure 1 ;

[0025] Figure 5 is a 2-2 sectional view in Figure 1 ;

[0026] Figure 6 is a 3-3 sectional view in Figure 3 ;

[0027] Figure 7 is an exploded schematic diagram of the lower prefabricated block in Figure 1 ;

[0028] Figure 8 is an exploded schematic diagram of the middle prefabricated block in Figure 1 ;

[0029] Figure 9 is an exploded schematic diagram of the upper prefabricated block in Figure 1 ;

[0030] Figure 10 isFigure 1 Structure diagram of prefabricated column in the application;

[0031] Figure 11 is an enlarged view of A in Figure 6

[0032] Figure 12 is a structure diagram of tee joint in the application;

[0033] Figure 13 is a structure diagram of tee joint in the application; Figure 12

[0034] Figure 14 is a process diagram of on-site assembly of three-column combined foundation in the application;

[0035] Figure 15 is a process diagram of on-site assembly of three-column combined foundation in the application;

[0036] Figure 16 is a structure diagram of middle-layer prefabricated block in example 2 of three-column combined foundation in the application;

[0037] Figure 17 is a structure diagram of middle-layer second prefabricated column installation passage and prefabricated column in the application; Figure 16

[0038] Figure 18 is a process diagram of assembly of middle-layer prefabricated block in example 2 of the application;

[0039] Figure 19 is a structure diagram of middle-layer second prefabricated column installation passage and prefabricated column in the application; Figure 18

[0040] ​​​​Explanation of reference signs: 1, upper layer prefabricated block; 2, lower layer prefabricated block; 3, middle layer prefabricated block; 4, transverse prestressed tendon; 5, prefabricated column; 6, concrete cushion; 7, anchoring opening; 8, anchoring end; 9, prefabricated column installation channel; 10, reserved screw hole; 11, reserved reinforcing bar; 12, corrugated pipe; 13, adapter; 14, grouting pipe; 15, anchoring base plate; 16, anchoring nut; 17, anchoring nut; 18, anchoring baffle; 19, protective sleeve; 20, spiral tendon; 21, transverse prestressed tendon; 22, transverse reserved prestressed tendon channel; 23, transverse shear key, shear key groove structure; 24, screw; 25, left prefabricated block; 26, right prefabricated block; 27, longitudinal prestressed tendon; 28, longitudinal shear key, shear key groove structure; 29, longitudinal reserved prestressed tendon channel; 30, front prefabricated block; 31, rear prefabricated block; 32, prefabricated column transverse channel; 33, prefabricated column longitudinal channel; 34, longitudinal shear key; 35, longitudinal shear key groove; 36, middle layer second prefabricated column installation channel; 37, middle layer first prefabricated column installation channel; 38, channel rear side step groove; 39, rear side reinforcement cage; 40, prefabricated column rear side groove; 41, post-cast concrete body; 42, groove. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0042] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0043] Embodiment 1 of a three-column combined foundation in the present application is shown in Figures 1-15

[0044] It comprises a lower layer prefabricated block 2, a middle layer prefabricated block 3, an upper layer prefabricated block 1 and three vertically arranged prefabricated columns 5 in a triangular distribution, the lower layer prefabricated block, the middle layer prefabricated block, the upper layer prefabricated block and the prefabricated column are all concrete prefabricated parts.

[0045] ​The shapes and thicknesses of the three concrete prefabricated parts of the lower prefabricated block, the middle prefabricated block and the upper prefabricated block are the same, the lower prefabricated block and the upper prefabricated block each comprise a left prefabricated block 25 and a right prefabricated block 26 assembled together along the left-right direction, and the left prefabricated block 25 and the right prefabricated block 26 are arranged symmetrically along the left-right direction. The middle prefabricated block 3 comprises a front prefabricated block 30 and a rear prefabricated block 31 assembled together along the front-rear direction, the front prefabricated block is a trapezoidal plate structure with the front smaller than the rear, and the rear prefabricated block is a rectangular plate structure.

[0046] The bottom of the prefabricated column is fixed on the lower prefabricated block, the middle prefabricated block and the upper prefabricated block are provided with prefabricated column installation channels 9 for the corresponding prefabricated columns to vertically penetrate, post-poured concrete bodies 41 are poured between the prefabricated columns and the prefabricated column installation channels, the left prefabricated block and the right prefabricated block are connected through a plurality of transverse prestressed tendons 21 extending along the left-right direction, the front prefabricated block and the rear prefabricated block are connected through a plurality of longitudinal prestressed tendons 27 extending along the front-rear direction, and the lower prefabricated block, the middle prefabricated block and the upper prefabricated block are connected through a plurality of vertically arranged screw rods 24.

[0047] In the embodiment, three reserved tendon units respectively used for connecting with corresponding prefabricated columns are fixed on the lower prefabricated block, each reserved tendon unit comprises a plurality of vertically arranged reserved tendons 11, two of the reserved tendon units are symmetrically distributed on the left prefabricated block and the right prefabricated block of the lower prefabricated block, and the other reserved tendon unit spans the left prefabricated block and the right prefabricated block of the lower prefabricated block. The connection between the prefabricated column and the lower prefabricated block can be determined according to actual conditions, and a special dry connection device capable of directly achieving self-balancing and self-adjusting is preferably used, or other connection modes such as the connection mode of grout anchor lap joint can be used.

[0048] The prefabricated column is provided with a prefabricated column transverse channel 32 for the corresponding transverse prestressed tendon to penetrate along the left-right direction, and is also provided with a prefabricated column longitudinal channel 33 for the corresponding longitudinal prestressed tendon to penetrate along the front-rear direction. In this way, the transverse prestressed tendon and the longitudinal prestressed tendon penetrate through the corresponding prefabricated column, so that the structural integrity is better, and the coordinated deformation between the prefabricated blocks is further satisfied, and the transverse prestressed tendon and the longitudinal prestressed tendon are respectively fixedly connected to the edges of the corresponding concrete prefabricated blocks through fixing structures. In the embodiment, the fixing structure adopts a conventional anchoring connection structure, and the anchoring connection structure comprises an anchoring backing plate 15, an anchoring nut 17, an anchoring prepared nut 16, an anchoring baffle 18 and a spiral tendon 20. During specific tensioning operation, one end of the corresponding prestressed tendon is connected to the concrete prefabricated block through the fixing structure, one end of the prestressed tendon is tensioned through a hollow hydraulic cylinder, and after tensioning, the tensioned end of the prestressed tendon is connected to the other side of the concrete prefabricated block through the fixing structure.

[0049] The splicing surfaces of the left and right prefabricated blocks are provided with a plurality of transverse shear keys and shear key groove structures 23 that are concave-convex matched in the left-right direction; the splicing surfaces of the front and rear prefabricated blocks are provided with a plurality of longitudinal shear keys and shear key groove structures 28 that are concave-convex matched in the front-rear direction. The contact surfaces between the lower and middle prefabricated blocks and the contact surfaces between the middle and upper prefabricated blocks are rough surfaces, and the rough surfaces are coated with a layer of bonding material; the shear keys and shear key grooves of the transverse shear key and shear key groove structure and the shear keys and shear key grooves of the longitudinal shear key and shear key groove structure are coated with a layer of bonding material.

[0050] In order to match the connection of the transverse and longitudinal prestressed tendons, the lower and upper prefabricated blocks are provided with transverse reserved prestressed tendon channels 22 for the corresponding transverse prestressed tendons to pass through, and the middle prefabricated blocks are provided with longitudinal reserved prestressed tendon channels 29 for the corresponding longitudinal prestressed tendons to pass through. The ends of the transverse and longitudinal reserved prestressed tendon channels are provided with anchoring openings 7, the inner side of the anchoring openings is provided with a corrugated pipe 12 that is sleeved on the outer periphery of the corresponding prestressed tendon, the end of the corrugated pipe is provided with an adapter 13, and the adapter is connected with a grouting pipe 14. Through the grouting pipe, concrete slurry can be injected between the prestressed tendon and the corrugated pipe.

[0051] The three prefabricated column installation channels on the middle prefabricated block are distributed on the front prefabricated block, and the other two prefabricated column installation channels are symmetrically distributed on the rear prefabricated block. The three prefabricated column installation channels on the upper prefabricated block are distributed on the left and right prefabricated blocks, respectively, and the other one is transversely distributed on the left and right prefabricated blocks.

[0052] In this embodiment, the cross section of the prefabricated column is a square structure, the cross section of the prefabricated column installation channel is also a square structure, the length and width of the prefabricated column installation channel are greater than those of the prefabricated column, the protrusions and grooves 42 are correspondingly arranged between the prefabricated column installation channel and the prefabricated column, and the post-cast concrete body is integrally fixed with the protrusions and grooves. Because in use, the gravity of the substation support acts on the prefabricated column, the prefabricated column must transmit the load it bears to the lower, middle and upper prefabricated blocks, respectively, to ensure the structural strength of the entire three-column combined foundation. The post-cast concrete body in the groove forms a force transmission structure to ensure that the force borne by the prefabricated column can be transmitted to the middle and upper prefabricated blocks.

[0053] In use, the lower prefabricated block, the middle prefabricated block, the upper prefabricated block and the prefabricated column are transported to the site, the bonding material (structural glue) is brushed between the contact surfaces of the concrete prefabricated blocks, first, the lower prefabricated block is placed according to the position of the line, the transverse prestressed steel corresponding to the tension is used to connect the left prefabricated block and the right prefabricated block of the lower prefabricated block into a whole, and the excess structural glue between the transverse shear key and the transverse shear key groove is discharged through the edge of the foundation.

[0054] Then, waterproof paint is brushed within a certain width range on both sides of each joint, the durability of the structural glue surface can be improved, secondly, the prefabricated column is fixed on the reserved reinforcing bar unit of the lower prefabricated block, then the middle prefabricated block and the upper prefabricated block are respectively sleeved into the prefabricated column for connection in the same way, and the middle prefabricated block and the upper prefabricated block are connected into a whole through the corresponding prestressed steel, the lower prefabricated block, the middle prefabricated block and the upper prefabricated block are fixed together along the vertical direction by using the screw rod, finally, the slurry is poured into the gap between the prefabricated column installation channel and the prefabricated column, and the preparation of the three-column combined foundation is completed.

[0055] The present application has the following technical effects:

[0056] 1. The prefabricated assembly type concrete foundation can avoid a series of work such as formwork erection, steel bar binding, concrete curing and formwork removal, can reduce labor, save time, protect the environment and the like.

[0057] 2. The layered split concrete foundation greatly overcomes the defects of large volume, large quality and difficult transportation of the concrete foundation.

[0058] 3. The upper prefabricated block, the middle prefabricated block and the lower prefabricated block are placed in sequence along the vertical direction, and the contact surfaces are arranged in the form of rough surface and bonding material (structural glue) acting together, which is beneficial to fastening the foundation and preventing slip, and can make the prefabricated components bear force together and deform coordinately.

[0059] 4. The two concrete prefabricated blocks in each layer are fixedly connected by using prestressing technology, and the contact surfaces are arranged as shear keys and bonding materials, wherein the prestressed steels of the middle prefabricated block and the upper prefabricated block penetrate the prefabricated column, the prestressed steels in the embodiment are taken as prestressed steel bars, the prestressed anchoring is used for pressing, the shear keys and the prestressed steel bars bear force together to resist the friction force of the contact surface, so that the force borne by the foundation is well transmitted to each prefabricated component, the prefabricated components bear force together and deform coordinately, and the prefabricated foundation has good stress performance and good integrity.

[0060] 5. The vertical direction is fastened and connected by using the screw rod, the concrete foundation is pressed in the vertical direction, and the integrity of the concrete foundation is greatly improved.

[0061] 6. The prefabricated column is anchored into the foundation through the prefabricated column installation channel, recesses and protrusions are arranged at the sidewall of the prefabricated column and the prefabricated column installation channel to further satisfy the coordinated deformation between the foundation layer and the layer and the common stress; the prefabricated column installation channel is left with a certain gap for later pouring of grouting material and convenient fastening of the prefabricated column. The prefabricated column is fixed on the lower concrete block, which can not only play a role in positioning the prefabricated column, but also improve the shear capacity of the foundation.

[0062] 7. Each concrete prefabricated block and prefabricated column is a planar member, which has regular shape and has significant advantages in production, transportation, stacking and the like.

[0063] An embodiment 2 of a three-column combined foundation is shown in Figures 16-19 The three prefabricated column installation channels on the middle layer prefabricated block are defined, one of which is a middle layer first prefabricated column installation channel 37 distributed on the front side prefabricated block, and the other two are middle layer second prefabricated column installation channels 36 symmetrically distributed on the left and right sides of the rear side prefabricated block. The longitudinal shear key and shear key groove structure includes a longitudinal shear key 34 arranged at the front end of the rear side prefabricated block and a longitudinal shear key groove 35 arranged at the rear section of the front side prefabricated block, and the left and right ends of the longitudinal shear key have guide inclined surfaces.

[0064] In the embodiment 1, there is no steel cage in the post-poured concrete body, so the force transmission capacity between the prefabricated column and the upper layer prefabricated block and the middle layer prefabricated block is limited. In order to provide the force transmission capacity between the concrete and the upper layer prefabricated block and the middle layer prefabricated block, the embodiment is different from the embodiment 1 in that:

[0065] The rear side upper end of the middle layer second prefabricated column installation channel 36 is provided with a channel rear side step groove 38, and the rear end of the corresponding prefabricated column is provided with a prefabricated column rear side groove 40 arranged opposite to the channel rear side step groove. The front side of the middle layer first prefabricated column installation channel is provided with a channel front side step groove, and the front end of the corresponding prefabricated column is provided with a prefabricated column rear side groove arranged opposite to the channel front side step groove.

[0066] When assembling the middle layer prefabricated block, first, the rear side prefabricated block is sleeved on the corresponding prefabricated column, the front side channel wall of the middle layer second prefabricated column installation channel is in contact with the front side wall of the corresponding prefabricated column, the front side prefabricated block is sleeved on the corresponding prefabricated column, and the rear side channel wall of the middle layer first prefabricated column installation channel is in contact with the rear side wall of the corresponding prefabricated column. At this time, as shown in Figures 18-19 The spacing between the longitudinal shear key and the longitudinal shear key groove is 2L, which refers to the spacing between the front end of the longitudinal shear key and the groove bottom of the longitudinal shear key groove.

[0067] The distance between the rear side channel wall of the middle layer second precast column installation channel and the corresponding rear side wall of the precast column is 2L, the front and rear depth of the channel rear side step groove is L, the front and rear depth of the precast column rear side groove is L, and the front and rear distance between the channel rear side step groove and the precast column rear side groove is 4L.

[0068] Then, the rear side steel reinforcement cage 39 with a front and rear width of 3L is placed on the channel rear side step groove.

[0069] Similarly, the distance between the front side channel wall of the middle layer first precast column installation channel 37 and the rear side wall of the corresponding precast column is 2L, the front and rear depth of the channel front side step groove is L, the front and rear depth of the precast column front side groove is L, the front and rear distance between the channel front side step groove and the precast column front side groove is 4L, and the front and rear width of the front side steel reinforcement cage is 3L.

[0070] Subsequently, the rear side precast block is pushed to move forward by a distance L, the front side precast block is pushed to move backward by a distance L, the top of the longitudinal shear key is in contact with the groove bottom of the longitudinal shear key groove, the front end of the rear side steel reinforcement cage is in contact with the groove bottom of the precast column rear side groove, and the rear end of the front side steel reinforcement cage is in contact with the groove bottom of the precast column front side groove. In fact, when the front end of the rear side steel reinforcement cage is in contact with the groove bottom of the precast column rear side groove, the rear side precast block has moved forward by a displacement L, and when the rear end of the front side steel reinforcement cage is in contact with the groove bottom of the precast column front side groove, the front side precast block has moved forward by a displacement L. The precast column located at the central position of the middle layer second precast column installation channel is located at the central position of the middle layer first precast column installation channel, and the longitudinal shear key and the longitudinal shear key groove are also matched.

[0071] The same way can complete the assembly of the upper layer precast block.

[0072] The post-cast concrete body is fixed into an integral structure with the front side steel reinforcement cage and the rear side steel reinforcement cage, respectively. When the precast column is under stress, the precast column located at the rear position transmits the force to the rear end of the middle layer precast block through the post-cast concrete body with the rear side steel reinforcement cage, and the precast column located at the front position transmits the force to the front end of the middle layer precast block through the post-cast concrete body with the front side steel reinforcement cage, thereby achieving perfect force transmission between the precast column and the middle layer precast block. In the present application, the relative movement of the front side precast block and the rear side precast block not only completes the process of placing the corresponding steel reinforcement cage, but also realizes the insertion and matching of the shear key and the shear key groove. Moreover, the movement distance of the front side precast block and the rear side precast block is easy to control through the limiting of the steel reinforcement cage.

[0073] The technical scheme of the assembly method of the three-column combined foundation is as follows Figures 1-19As shown: the method comprises the following steps, first, assembling the lower prefabricated blocks at the construction site, fixing the left prefabricated block and the right prefabricated block of the lower prefabricated block together through the transverse prestressed tendon; second, fixing the three prefabricated columns on the corresponding reserved reinforcing bar units of the lower prefabricated block respectively; third, hoisting the front prefabricated block and the rear prefabricated block of the middle prefabricated block, so that each prefabricated column is distributed along the corresponding prefabricated column installation channel of the middle prefabricated block in the vertical direction, and fixing the front prefabricated block and the right prefabricated block of the middle prefabricated block together through the longitudinal prestressed tendon; third, hoisting the left prefabricated block and the right prefabricated block of the upper prefabricated block, so that each prefabricated column is distributed along the corresponding prefabricated column installation channel of the upper prefabricated block in the vertical direction, and fixing the left prefabricated block and the right prefabricated block of the upper prefabricated block together through the transverse prestressed tendon; fourth, connecting the lower prefabricated block, the middle prefabricated block and the upper prefabricated block together through the plurality of vertically arranged screw rods, and pouring the post-poured concrete body between the prefabricated columns and the prefabricated column installation channel.

[0074] During the assembling process of the lower prefabricated block, the middle prefabricated block and the upper prefabricated block, a layer of bonding material is applied between the left prefabricated block and the right prefabricated block; a layer of bonding material is applied between the front prefabricated block and the rear prefabricated block; and a layer of bonding material is applied on the contact surface between the lower prefabricated block and the middle prefabricated block and the contact surface between the middle prefabricated block and the upper prefabricated block.

[0075] In the second step, during hoisting the front and rear prefabricated blocks of the middle layer prefabricated block, three prefabricated column installation channels on the middle layer prefabricated block are defined, one of which is a middle layer first prefabricated column installation channel distributed on the front prefabricated block, and the other two are middle layer second prefabricated column installation channels symmetrically distributed on the left and right sides of the rear prefabricated block. The rear side of the middle layer second prefabricated column installation channel is provided with a channel rear side step groove, and the rear end of the corresponding prefabricated column is provided with a prefabricated column rear side groove arranged opposite to the channel rear side step groove. The front side of the middle layer first prefabricated column installation channel is provided with a channel front side step groove, and the front end of the corresponding prefabricated column is provided with a prefabricated column front side groove arranged opposite to the channel front side step groove. A plurality of longitudinal shear keys and shear key groove structures in the front and rear direction are arranged on the splicing surface of the front and rear prefabricated blocks. The longitudinal shear key and the longitudinal shear key groove include a longitudinal shear key and a longitudinal shear key groove. First, the rear prefabricated block is sleeved on the corresponding prefabricated column, the front side wall of the middle layer second prefabricated column installation channel is in contact with the front side wall of the corresponding prefabricated column, the front prefabricated block is sleeved on the corresponding prefabricated column, and the rear side wall of the middle layer first prefabricated column installation channel is in contact with the rear side wall of the corresponding prefabricated column. The spacing between the longitudinal shear key and the longitudinal shear key groove is 2L, the spacing between the rear side wall of the middle layer second prefabricated column installation channel and the rear side wall of the corresponding prefabricated column is 2L, the front and rear depth of the channel rear side step groove is L, the front and rear depth of the prefabricated column rear side groove is L, the front and rear spacing between the channel rear side step groove and the prefabricated column rear side groove is 4L, and the rear side steel reinforcement cage with a front and rear width of 3L is placed on the channel rear side step groove. The spacing between the front side wall of the middle layer first prefabricated column installation channel and the rear side wall of the corresponding prefabricated column is 2L, the front and rear depth of the channel front side step groove is L, the front and rear depth of the prefabricated column front side groove is L, the front and rear spacing between the channel front side step groove and the prefabricated column front side groove is 4L, and the front side steel reinforcement cage with a front and rear width of 3L is placed on the channel front side step groove. The value range of L is 5-20 cm.

[0076] Subsequently, the rear prefabricated block is pushed forward by a distance of L, and the front prefabricated block is pushed backward by a distance of L. The top of the longitudinal shear key is in contact with the groove bottom of the longitudinal shear key groove, the front end of the rear steel reinforcement cage is in contact with the groove bottom of the prefabricated column rear side groove, and the rear end of the front steel reinforcement cage is in contact with the groove bottom of the prefabricated column front side groove. This scheme corresponds to the third column combined foundation embodiment 2.

[0077] In the fourth step, the corresponding post-cast concrete body is respectively poured and fixed with the front and rear steel reinforcement cages to form an integral structure.

[0078] In the above description of the present specification, unless otherwise explicitly specified and limited, the terms "fixed", "mounted", "connected" or "linked" and the like should be understood in a broad sense. For example, as to the term "connected", it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or it can be internal connection of two elements or interaction relationship between two elements. Therefore, unless otherwise explicitly limited in the present specification, the above terms can be understood in the specific meaning in the present application by the person skilled in the art according to the specific circumstances.

[0079] According to the above description of the present specification, the person skilled in the art can also understand that the terms used according to the present specification, such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise" and the like indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings of the present specification, which are only for the purpose of facilitating the description of the present application and simplifying the description, and are not explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in the specific orientation, therefore the above orientation or positional relationship terms cannot be understood or interpreted as a limitation on the present application.

[0080] In addition, the terms "first" or "second" and the like used in the present specification are terms used to refer to numbers or ordinal numbers only for the purpose of description, and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" or "second" can explicitly or implicitly include at least one of the features. In the description of the present specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise explicitly specified and limited.

[0081] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for assembling a three-column joint foundation, characterized in that: The three-column joint base includes a lower prefabricated block, a middle prefabricated block, an upper prefabricated block and three vertically arranged prefabricated columns distributed in a triangle, the lower prefabricated block and the upper prefabricated block each including a left prefabricated block and a right prefabricated block assembled together in the left-right direction, the middle prefabricated block includes a front prefabricated block and a rear prefabricated block assembled together in the front-back direction, the bottom of the prefabricated column is fixed on the lower prefabricated block, the middle prefabricated block and the upper prefabricated block are provided with a prefabricated column installation channel for the corresponding prefabricated column to pass through vertically, a post-cast concrete body is poured between the prefabricated column and the prefabricated column installation channel, the left prefabricated block and the right prefabricated block are connected by a plurality of transverse prestressed tendons extending in the left-right direction, the front prefabricated block and the rear prefabricated block are connected by a plurality of longitudinal prestressed tendons extending in the front-back direction, the lower prefabricated block, the middle prefabricated block and the upper prefabricated block are connected by a plurality of vertically arranged screws, The method comprises the following steps: first, assembling the lower prefabricated blocks at the construction site, fixing the left and right prefabricated blocks of the lower prefabricated blocks together by means of transverse prestressed tendons; second, fixing the three prefabricated columns to the corresponding reserved dowel units of the lower prefabricated blocks; third, hoisting the front and rear prefabricated blocks of the middle prefabricated blocks so that the prefabricated columns are distributed along the corresponding prefabricated column installation channels that vertically penetrate the middle prefabricated blocks, and fixing the front and rear prefabricated blocks of the middle prefabricated blocks by means of longitudinal prestressed tendons. The prefabricated blocks and the right prefabricated blocks are fixed together; the third step is to lift the left prefabricated blocks and the right prefabricated blocks of the upper prefabricated blocks so that the prefabricated columns are distributed along the corresponding prefabricated column installation channels that vertically penetrate the upper prefabricated blocks, and the left prefabricated blocks and the right prefabricated blocks of the upper prefabricated blocks are fixed together by transverse prestressed tendons; the fourth step is to connect the lower prefabricated blocks, the middle prefabricated blocks and the upper prefabricated blocks together by multiple vertically arranged screws, and pour post-cast concrete between the prefabricated columns and the prefabricated column installation channels. In the second step, during the process of lifting the front and rear prefabricated blocks of the middle-layer prefabricated blocks, three prefabricated column installation channels on the middle-layer prefabricated blocks are defined, one of which is the middle-layer first prefabricated column installation channel distributed on the front prefabricated block, and the other two are the middle-layer second prefabricated column installation channels symmetrically distributed on the left and right sides of the rear prefabricated block. A channel rear step groove is provided at the rear side of the middle-layer second prefabricated column installation channel, and a prefabricated column rear groove is provided at the rear end of the corresponding prefabricated column, which is arranged opposite to the channel rear step groove. The front side of the installation channel of the first prefabricated column in the middle layer is provided with a channel front side step groove, and the front end of the corresponding prefabricated column is provided with a prefabricated column rear side groove arranged opposite to the channel front side step groove. The splicing surfaces of the front and rear prefabricated blocks are provided with multiple longitudinal shear keys and shear key groove structures that match concave and convex in the front and rear directions. The longitudinal shear keys and shear key grooves include longitudinal shear keys and longitudinal shear key grooves. First, the rear prefabricated block is connected to the corresponding prefabricated column, and the front channel wall of the installation channel of the second prefabricated column in the middle layer contacts the front side wall of the corresponding prefabricated column. The front prefabricated block is sleeved on the corresponding prefabricated column, the rear channel wall of the installation channel of the first prefabricated column in the middle layer contacts the rear wall of the corresponding column, the spacing between the longitudinal shear key and the longitudinal shear key groove is 2L, the spacing between the rear channel wall of the installation channel of the second prefabricated column in the middle layer and the rear wall of the corresponding prefabricated column is 2L, the front-to-back depth of the step groove on the rear side of the channel is L, the front-to-back depth of the groove on the rear side of the prefabricated column is L, the front-to-back spacing between the step groove on the rear side of the channel and the groove on the rear side of the prefabricated column is 4L, and a rear steel cage with a front-to-back width of 3L is placed on the step groove on the rear side of the channel; the spacing between the front channel wall of the installation channel of the first prefabricated column in the middle layer and the rear wall of the corresponding prefabricated column is 2L, the front-to-back depth of the step groove on the front side of the channel is L, the front-to-back depth of the groove on the front side of the prefabricated column is L, the front-to-back spacing between the step groove on the front side of the channel and the groove on the front side of the prefabricated column is 4L, and a front steel cage with a front-to-back width of 3L is placed on the step groove on the front side of the channel; Then, push the rear prefabricated block forward by a distance of L, and push the front prefabricated block backward by a distance of L, the top of the longitudinal shear key contacts the bottom of the longitudinal shear key slot, the front end of the rear steel cage contacts the bottom of the groove on the rear side of the prefabricated column, and the rear end of the front steel cage contacts the bottom of the groove on the front side of the prefabricated column. In the fourth step, the corresponding post-cast concrete body is cast and fixed with the front steel cage and the rear steel cage to form an integral structure.

2. The assembly method according to claim 1, wherein: During the assembly process of the lower prefabricated blocks, the middle prefabricated blocks and the upper prefabricated blocks, a layer of bonding material is applied between the left prefabricated blocks and the right prefabricated blocks; a layer of bonding material is applied between the front prefabricated blocks and the rear prefabricated blocks; a layer of bonding material is applied to the contact surfaces between the lower prefabricated blocks and the middle prefabricated blocks and the contact surfaces between the middle prefabricated blocks and the upper prefabricated blocks.

3. The assembly method according to claim 1, wherein: Three reserved dowel bars are fixed on the lower prefabricated block, which are used to connect with the corresponding prefabricated columns respectively. Each reserved dowel bar unit includes multiple vertically arranged reserved dowel bars, two of which are symmetrically distributed on the left and right prefabricated blocks of the lower prefabricated block, and the other reserved dowel bar unit spans the left and right prefabricated blocks of the lower prefabricated block.

4. The assembly method according to claim 3, wherein: The prefabricated column is provided with a transverse channel for the corresponding transverse prestressed tendons to pass through in the left-right direction, and the prefabricated column is also provided with a longitudinal channel for the corresponding longitudinal prestressed tendons to pass through in the front-back direction.

5. The assembly method according to claim 3 or 4, characterized in that: The lower prefabricated blocks, middle prefabricated blocks and upper prefabricated blocks have the same shape. The front prefabricated block is a trapezoidal plate structure with a smaller front and a larger back. The rear prefabricated block is a rectangular plate structure. The left prefabricated block and the right prefabricated block are left-right symmetrical structures. Among the three prefabricated column installation channels on the middle prefabricated block, one prefabricated column installation channel is distributed on the front prefabricated block, and the other two prefabricated column installation channels are symmetrically distributed on the rear prefabricated block; among the three prefabricated column installation channels on the upper prefabricated block, two are symmetrically distributed on the left prefabricated block and the right prefabricated block, and the other spans the left prefabricated block and the right prefabricated block.

6. The assembly method according to claim 5, characterized in that: The splicing surfaces of the left and right prefabricated blocks are provided with a plurality of transverse shear keys and shear key groove structures that are concave and convex in the left and right directions; the splicing surfaces of the front and rear prefabricated blocks are provided with a plurality of longitudinal shear keys and shear key groove structures that are concave and convex in the front and rear directions.

7. The assembly method according to claim 5, characterized in that: Corresponding protrusions and grooves are provided between the prefabricated column installation channel and the prefabricated column, and the post-cast concrete body is cast and fixed with the protrusions and grooves to form an integral structure.

8. The assembly method according to claim 6, characterized in that: The contact surfaces between the lower prefabricated blocks and the middle prefabricated blocks and the contact surfaces between the middle prefabricated blocks and the upper prefabricated blocks are rough surfaces, and a bonding material layer is coated on the rough surfaces; a bonding material layer is coated between the shear keys and shear key grooves of the transverse shear keys and shear key groove structures and between the shear keys and shear key grooves of the longitudinal shear keys and shear key groove structures.

Images