CN111691601A - Overlapped column with corner vertical holes in centralized arrangement and directly connected with stressed longitudinal bars and construction process - Google Patents

Abstract

The vertical holes at the corners are centrally configured with superimposed columns and construction techniques that directly connect the stressed longitudinal bars. The pre-buried shaped pipes form through vertical holes at the four corners of the prefabricated columns. Only the structural longitudinal bars, auxiliary longitudinal bars and hoop are arranged in the prefabricated columns. Bars and tie bars, no reinforcement sticks out of the prefabricated column; the longitudinal reinforcement of the column is centrally arranged in the vertical hole at the corner of the prefabricated column at the construction site, and the longitudinal reinforcement of the upper and lower columns is directly connected by mechanical connection joints at the root of the prefabricated column; After the concrete is post-cast in the hole, the precast column and post-cast part form a superimposed column to participate in the structural stress. Shaped pipes are made by rolling thin-walled steel plates. When the column section is large, a through pouring hole is set in the middle of the prefabricated column section to ensure that the bottom horizontal joint is poured and the concrete is poured densely. In the production stage of the above-mentioned prefabricated columns, the molds do not have holes, and the prefabricated columns are not equipped with longitudinal reinforcement. The standardization of the mold and the reinforcement cage is high; the longitudinal reinforcement is directly connected, the connection is reliable, and the cost is low. Fast, quality is easy to guarantee.

Description

Stacked Columns Directly Connected with Stressed Longitudinal Reinforcing Bars and Construction Technology

technical field

The invention belongs to the technical field of construction, relates to a prefabricated column, and particularly relates to a superimposed column with vertical holes at the corners being centrally arranged to directly connect the longitudinal reinforcement under force and a construction process.

Background technique

At present, prefabricated concrete frame structures are widely used in prefabricated concrete public buildings in my country. The longitudinal bars of prefabricated columns are mostly connected by sleeve grouting. In the production stage, the mold needs to be opened, the standardization of the prefabricated column reinforcement cage is low, and the production efficiency is low; aroused a series of social concerns.

In response to the above problems, the hollow column technology based on the lap connection of longitudinal bars has been developed at home and abroad, which relieves the processing and installation difficulties caused by the use of sleeve grouting connection for the longitudinal bars of prefabricated columns. If it is larger than 20mm, there are problems of long lap length and large amount of steel bars when using lap joints, and the reliability of the force transmission of large-diameter steel bar lap joints has not been fully verified by tests. The lap joint will cause the plastic hinge of the column to move up under the action of earthquake, weaken the elastic-plastic deformation ability of the column, and easily form the short column effect. In addition, the existing hollow columns mostly use core pulling or multiple prefabrication processes to form an internal hollow, the production process is complex, and there are many procedures, which cannot be produced on a large number of existing flat die production lines in my country, and the promotion is restricted.

SUMMARY OF THE INVENTION

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a superimposed column and a construction process in which the vertical holes at the corners are centrally arranged to directly connect the stressed longitudinal bars, and the formed pipes are formed at the corners of the prefabricated columns by one-time concrete pouring. Through the vertical hole, there is no need for special hole-forming equipment, and it can be produced on the existing flat die production line, with few prefabricated production links and high production efficiency. The longitudinal reinforcement of the column is penetrated in the vertical hole at the corner of the prefabricated column and is directly connected by mechanical connection joints. The force transmission is reliable, which can avoid the upward movement of the column plastic hinge, the reduction of the elastic-plastic deformation capacity and the short column caused by the overlapping connection of the longitudinal reinforcement. The damage effect can ensure that the composite column achieves the same seismic performance as cast-in-place. In addition, the prefabricated column has no steel bar protruding, and the standardization and generalization of the mold can be realized in the production stage, which is helpful for the cost control of the prefabricated column and the protection of the finished product during transportation.

In order to achieve the above object, the technical scheme adopted in the present invention is:

The vertical holes at the corners are centrally arranged with superimposed columns directly connected to the longitudinal reinforcement under stress, including the prefabricated column 1. A vertical hole 11 is arranged at each corner of the prefabricated column 1, and the construction site is centrally arranged in each vertical hole 11. The longitudinal reinforcement 21 provides bending resistance for the superimposed column, and stirrups are arranged in the prefabricated column 1 to form a stirrup restraint effect on the precast column concrete and the post-cast concrete 24, and provide elastic-plastic deformation capacity for the superimposed column, wherein The stressed longitudinal bars 21 and the stirrups are arranged separately, the post-cast concrete 24 is poured in the vertical holes 11, and the post-cast precast column 1, the post-cast concrete 24 and the stressed longitudinal bars 21 form a superimposed column as a whole, participating in the structural stress.

The cross-section of the prefabricated column 1 is rectangular, and the prefabricated column 1 is pre-buried at its four corners to form a vertical hole 11 after the prefabricated column 1 is poured with concrete. The shape of the cross section is hexagon, chamfered rectangle, rounded rectangle or circle, and the corresponding vertical hole 11 has a cross section shape of hexagon, chamfered rectangle, circle The corners are rectangular or round, and the maximum dimension of the edge of the shaping pipe 12 from the four sides of the prefabricated column 1 is not less than 120mm.

The structural longitudinal reinforcement 131 or the auxiliary longitudinal reinforcement 132 is arranged in the prefabricated column 1, and the prefabricated column reinforcement cage 13 is formed with the stirrups. The diameter of the structural longitudinal reinforcement 131 or the auxiliary longitudinal reinforcement 132 is a structural requirement and does not change with the stress of the superimposed column. , the structural longitudinal bars 131 or the auxiliary longitudinal bars 132 do not protrude from the bottom surface and top surface of the prefabricated column 1, and do not participate in the force calculation.

The structural longitudinal bars 131 are arranged at the corners or intersections of the stirrups of the prefabricated column 1. The diameter of the structural longitudinal bars 131 is between 8 and 12 mm. When the distance a of the stirrups inside the vertical hole 11 along the horizontal direction is not greater than 400mm, the auxiliary longitudinal bars 132 are not arranged in the middle of each side of the prefabricated column 1; the distance a of the stirrups inside the vertical hole 11 along the horizontal direction is greater than 400mm At the time, auxiliary longitudinal bars 132 are arranged in the middle of each side of the prefabricated column 1 to control the distance between the legs of the stirrups, and the diameter of the auxiliary longitudinal bars 132 is between 10 and 14 mm.

The stirrups are composite stirrups formed by large stirrups 133, small stirrups 134 and tie bars 135, or a welded stirrup net 136, wherein the large stirrups 133 and the small stirrups 134 are welded closed stirrups, and the small stirrups are welded. There are a plurality of ribs 134 on each layer, which constrain the adjacent vertical holes 11 respectively, and the large stirrups 133 constrain all the vertical holes 11 .

When the length of the side of the prefabricated column 1 is greater than 700mm, the prefabricated pipes or corrugated pipes are embedded in the middle of the section of the prefabricated column 1 to form a pouring hole 16 penetrating the height direction of the prefabricated column 1 to ensure that the bottom horizontal joint 4 is poured with concrete 24. 16. The maximum dimension of the cross section from the four sides of the prefabricated column 1 is not less than 90mm; no longitudinal reinforcement is arranged in the pouring hole 16 at the construction site.

There are no more than four stressed longitudinal bars 21 arranged in each vertical hole 11, and the stressed longitudinal bars 21 are involved in the stress calculation. and the minimum reinforcement ratio requirements of the current code for the longitudinal reinforcement of the column; the longitudinal reinforcement 21 of the upper and lower layers is connected by the reinforcement joint 23, and the reinforcement joint 23 is a mechanical connection joint, arranged at the same height, or staggered along the height a certain distance.

Protrusions 14 are arranged at the bottom of the prefabricated column 1 to ensure the compactness of the bottom horizontal joint 4 and the post-cast concrete 24 near the bottom surface of the prefabricated column 1, and to improve the shear resistance of the bottom horizontal joint 4. The height of the projection 14 protruding from the prefabricated column 1 is not Less than 30mm, bevels are set around.

The present invention also provides a construction process in which the vertical holes at the corners are centrally arranged with the superimposed columns directly connected to the stressed longitudinal bars. A through vertical hole 11 is respectively machined at each corner of the prefabricated column 1. On the construction site, the The stressed longitudinal reinforcement 21 is concentrated in each vertical hole 11 to provide bending resistance for the stacked column, and stirrups are arranged in the prefabricated column 1 to form a stirrup restraint effect on the prefabricated column concrete and the post-cast concrete 24. The superimposed column provides elastic-plastic deformation ability, wherein the longitudinal reinforcement 21 and the stirrup are arranged separately, and the concrete 24 is poured after pouring in the vertical hole 11. Combined with the column as a whole, it participates in the stress of the structure.

The prefabricated column 1 is hoisted after the longitudinal reinforcement 21 is connected with the longitudinal reinforcement 22 of the lower column extending from the floor 3. The height of the horizontal joint 4 at the bottom of the prefabricated column 1 is not less than 60mm, and the steel joint 23 is arranged in the vertical hole 11. , the height of the bottom horizontal joint 4 and the installation accuracy of the prefabricated column 1 are controlled by the leveling bolt 25. The leveling bolt 25 is screwed into the pre-embedded internal thread sleeve 15 embedded in the bottom of the prefabricated column 1; or the prefabricated column 1 is hoisted. After completion, the longitudinal reinforcement 21 is inserted in the vertical hole 11 to connect with the longitudinal reinforcement 22 of the lower column extending from the floor 3. The height of the horizontal joint 4 at the bottom of the prefabricated column 1 is not less than 200mm, and the steel joint 23 is arranged at the bottom level. Inside the seam 4, the height of the bottom horizontal seam 4 is controlled by the legs 26.

Specifically, when first connecting and then hoisting, place the large stirrups 133 in the bottom horizontal joint 4 at the root of the lower column stress longitudinal bars 22, and place the stress longitudinal bars 21 and the lower column stress longitudinal bars extending from the floor 3. 22 Connect the steel bar joints 23 one by one, then hoist the prefabricated column 1, adjust the leveling bolts 25 to calibrate the installation accuracy of the prefabricated column 1, and then move the large stirrups 133 in the bottom horizontal joint 4 upward to the design position and bear longitudinal force with the lower column. The rib 22 is bound and positioned; the bottom horizontal joint 4 is then supported, and the bottom horizontal joint 4 and the post-poured concrete 24 in the vertical hole 4 are completed through the vertical hole 11; finally, the curing formwork is removed to complete the connection between the prefabricated column 1 and the lower structure .

When first hoisting and then connecting, place the large stirrups 133 in the bottom horizontal joint 4 at the root of the lower column stressed longitudinal bars 22; then place the column legs 26, hoist the prefabricated column 1, and adjust the installation accuracy of the prefabricated column 1; The stressed longitudinal bars 21 are pierced from top to bottom in the holes 11, and the connection construction of the steel bar joints 23 is completed in the bottom horizontal joint 4, and then the large stirrups 133 in the bottom horizontal joint 4 are moved upwards to the design position and are connected with each other. The stressed longitudinal reinforcement 21 and the lower column stressed longitudinal reinforcement 22 are bound and positioned, and then the bottom horizontal joint 4 is supported, and the bottom horizontal joint 4 and the post-cast concrete 24 in the vertical hole 11 are completed through the vertical hole 11; The mold is completed to complete the connection between the prefabricated column 1 and the lower structure.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The longitudinal reinforcement of the prefabricated column of the present invention does not need to be connected by the sleeve grouting connection joint, which avoids the problems of the existing sleeve grouting connection of the prefabricated column steel bar alignment difficulty, the difficulty of joint grouting quality control, and the poor feasibility of winter construction.

(2) The longitudinal reinforcement of the column under force of the present invention is concentratedly arranged in the vertical hole at the corner of the prefabricated column, and the mechanical connection joint of the reinforcement is adopted, the longitudinal reinforcement has high stress efficiency, no reinforcement alignment problem, high on-site installation efficiency, and low joint cost.

(3) Compared with the hollow column connected by the lap joint of the longitudinal reinforcement, the longitudinal reinforcement of the column in the present invention is directly connected by the mechanical connection joint of the reinforcement bar, and the force transmission is reliable, which can avoid the upward movement of the column plastic hinge and the elastic plastic caused by the overlapping connection of the longitudinal reinforcement. Deformation capacity reduction and short column failure effect can ensure that the composite column achieves the same seismic performance as cast-in-place.

(4) The prefabricated column of the present invention is casted in one time to form a vertical hole, without special hole-forming equipment, and can be produced by a flat die of an existing flat die production line.

(5) The shape of the shaping pipe used in the present invention is simple, easy to process, and has a low cost, which is beneficial to the cost control of the prefabricated column.

(6) The prefabricated column reinforcement cage of the present invention has no longitudinal reinforcement under stress, the diameters of the structural longitudinal reinforcement and the auxiliary longitudinal reinforcement are easy to unify, the standardization and generalization of the prefabricated column reinforcement cage can be realized, and the production organization of the prefabricated component factory is convenient.

(7) The prefabricated column of the present invention does not have steel bars protruding, and the mold does not need to open holes in the production stage, and standardized molds can be used to reduce costs, which is beneficial to the finished product protection of the prefabricated column during transportation and hoisting.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of a prefabricated column of the present invention. A vertical hole is formed by pre-embedding a hexagonal shaped pipe in the prefabricated column.

FIG. 2 is a schematic view of the section A-A in FIG. 1 .

FIG. 3 is a three-dimensional schematic diagram of the hexagonal shaped pipe used in FIG. 1 .

FIG. 4 is a schematic diagram of the prefabricated column reinforcement cage in FIG. 1 .

FIG. 5 is a three-dimensional schematic diagram of the connection between the prefabricated column and the lower structure when the longitudinal reinforcement of the column is connected first, and then the prefabricated column is installed.

FIG. 6 is a schematic cross-sectional view of B-B in FIG. 5 .

FIG. 7 is a schematic diagram of the bottom horizontal seam connection structure in FIG. 5 .

FIG. 8 is a three-dimensional schematic diagram of the partial structure of the bottom horizontal seam in FIG. 5 .

FIG. 9 is a three-dimensional schematic diagram of the bottom structure of the prefabricated column in FIG. 5 .

FIG. 10 is a three-dimensional schematic diagram of the connection between the prefabricated column and the lower structure when the prefabricated column is installed first, and then the longitudinal reinforcement of the column is connected.

FIG. 11 is a schematic diagram of the connection structure of the bottom horizontal seam in FIG. 10 .

Fig. 12 is a schematic diagram of the structure of a superimposed column with a vertical hole of a prefabricated column having a rectangular cross-section.

Fig. 13 is a schematic diagram of a shaped pipe whose cross section is a chamfered rectangle used in the prefabricated column in Fig. 12 .

Fig. 14 is a schematic diagram of the structure of a superimposed column with a vertical hole of a prefabricated column having a rounded rectangular cross-section.

FIG. 15 is a schematic diagram of a shaped pipe with a rounded rectangular cross-section used in the prefabricated column in FIG. 14 .

Fig. 16 is a schematic diagram of the cross-sectional structure of a prefabricated column using a welded stirrup mesh.

FIG. 17 is a schematic diagram of the prefabricated column reinforcement cage in FIG. 16 .

FIG. 18 is a three-dimensional schematic diagram of a prefabricated column with a through-casting hole provided in the middle of the cross section.

FIG. 19 is a schematic cross-sectional structural diagram of the superimposed column formed by the prefabricated column in FIG. 18 .

Figure 20 is a schematic cross-sectional view of a prefabricated column with a small cross-section and no auxiliary longitudinal reinforcement.

Figure 21 is a schematic diagram of the structure of a superimposed column in which the vertical hole of the prefabricated column is a rectangle with cut corners in cross section, and four longitudinal ribs are arranged in each vertical hole.

Figure 22 is a schematic diagram of the structure of a superimposed column in which the vertical hole of the prefabricated column is a rounded rectangle in cross section, and four longitudinal ribs are arranged in each vertical hole.

In the figure: 1- prefabricated column; 11- vertical hole; 12- shaped pipe; 13- prefabricated column reinforcement cage; 131- structural longitudinal reinforcement; 132- auxiliary longitudinal reinforcement; 133- large stirrup; 134- small stirrup; 135 - Tension bar; 136 - Welded stirrup mesh; 14 - Protrusion; 15 - Embedded internal thread sleeve; 16 - Pouring hole; 21 - Stressed longitudinal reinforcement; 22 - Stressed longitudinal reinforcement of lower column; ; 24- post-cast concrete; 25- leveling bolts; 26- column legs; 3- floors; 4- bottom horizontal joints.

Detailed ways

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in FIGS. 1 to 22 , the vertical holes at the corners of the present invention are centrally configured with stacked columns and construction techniques that directly connect the stressed longitudinal bars. The stressed longitudinal bars 21. Among them, the longitudinal reinforcement 21 provides bending resistance for the superimposed column, and the stirrup improves the compressive performance of the concrete through the restraint effect to ensure the elastic-plastic deformation ability of the superimposed column. The idea is to optimize and improve the prefabricated column and connection structure, and separate and configure the longitudinal reinforcement 21 and the stirrup.

Specifically, through vertical holes 11 are reserved at each corner of the prefabricated column 1, and the stressed longitudinal bars 21 are centrally arranged in the corner vertical holes 11 of the prefabricated column 1 on the construction site to provide bending resistance for the superimposed column; The ribs are all arranged in the prefabricated column 1, forming a stirrup restraint effect on the prefabricated column concrete and the post-cast concrete 24 to ensure the elastic-plastic deformation capacity of the superimposed column; The poured concrete 24 and the stressed longitudinal bars 21 arranged in the vertical holes 11 form a superimposed column to participate in the stress of the structure as a whole.

The longitudinal reinforcement bars 21 in the vertical holes 11 on the upper and lower layers are connected by steel bar joints 23. The steel bar joints 23 are mechanical connection joints, and straight threaded joints are preferred. The joints can be arranged at the same height or staggered along the height to avoid being in the same connection area. Segments are 100% connected to reduce demands on joint performance. The stressed longitudinal reinforcement 21 participates in the stress calculation, and the total reinforcement area meets the requirements for checking the flexural bearing capacity of the superimposed column, and also needs to meet the minimum reinforcement ratio requirements of the current code for the longitudinal reinforcement of the column under stress. The total number of stressed longitudinal bars 21 in each vertical hole 11 shall not exceed four, the diameter of the stressed longitudinal bars 21 shall not be less than 16 mm and shall not be greater than 32 mm, and the number of stressed longitudinal bars 21 in each vertical hole 11 shall be It should be comprehensively determined according to the total area and diameter of the reinforcement. Under the premise that the diameter of the longitudinal reinforcement 21 under stress is preferably controlled to be between 20 and 28 mm, the number of longitudinal reinforcement reinforcement 21 in each vertical hole 11 should be reduced as much as possible. The number of steel bar joints 23 facilitates the pouring and vibrating of the post-cast concrete 24 in the vertical hole 11, thereby improving the site construction efficiency and reducing the cost.

In one structure of the present invention, the cross-section of the prefabricated column 1 is rectangular, and only through vertical holes 11 are reserved at the four corners of the prefabricated column 1 for arranging the force-bearing longitudinal bars 21 to avoid the interference of the force-bearing longitudinal bars 21 on the construction site. Prefabricated beams are installed, and at the same time, the number of vertical holes 11 is reduced and the cost of prefabricated columns 1 is controlled on the premise of ensuring the layout of stressed longitudinal bars 21 . The structural longitudinal reinforcement 131 or the auxiliary longitudinal reinforcement 132 and the stirrups are arranged in the prefabricated column 1 to form the prefabricated column reinforcement cage 13 .

The vertical hole 11 is formed by pre-buried shaped pipe 12 after pouring the concrete of the prefabricated column 1. The shaped pipe 12 is made by rolling thin-walled steel plate. The inner wall can be set with protrusions to form a rough surface, or the natural forming surface of the steel plate can be used. The cross-sectional shape It is hexagon, chamfered rectangle, rounded rectangle or circle, and the corresponding vertical hole 11 has a cross-sectional shape of hexagon, chamfered rectangle, rounded rectangle or circle. The maximum size is not less than 120mm.

In one structure of the present invention, the structural longitudinal bars 131 are arranged at the corners or intersections of the stirrups of the prefabricated column 1 to form a prefabricated column reinforcement cage 13 with the stirrups. Determined according to the form of stirrups, tied with stirrups or fixed by welding.

In the present invention, the prefabricated column stirrups can be composite stirrups composed of large stirrups 133, small stirrups 134 and tie bars 135, or directly welded stirrup nets 136, of which the large stirrups 133 and the small stirrups 134 are preferred Welded closure hoop. Four small stirrups 134 can be provided, and the subsections form an enclosure for the adjacent vertical holes 11 to strengthen the restraint effect on the stressed longitudinal bars 21 centrally arranged in the vertical holes 11 .

In the present invention, when the leg distance a of the stirrups inside the vertical holes 11 at the corners of the prefabricated column 1 is not greater than 400 mm in the horizontal direction, the auxiliary longitudinal bars 132 may not be provided in the middle of each side of the prefabricated column 1; the vertical holes 11 at the corners of the prefabricated column 1 When the leg distance a of the inner stirrups along the horizontal direction is greater than 400mm, auxiliary longitudinal bars 132 are arranged in the middle of each side of the prefabricated column 1 to control the leg distance of the stirrups. The diameter of the auxiliary longitudinal bars 132 is between 10 and 14 mm.

In the present invention, the prefabricated column 1 is hoisted after the longitudinal reinforcement 21 is connected to the longitudinal reinforcement 22 of the lower column extending from the floor 3. At this time, the height of the horizontal joint 4 at the bottom of the prefabricated column 1 is not less than 60mm, and the reinforcement joint 23 is arranged in In the vertical hole 11, the height of the bottom horizontal joint 4 and the installation accuracy of the prefabricated column 1 are controlled by the leveling bolt 25. After the prefabricated column 1 is hoisted, the longitudinal reinforcement 21 is inserted in the vertical hole 11 to connect with the longitudinal reinforcement 22 of the lower column extending from the floor 3. At this time, the height of the horizontal joint 4 at the bottom of the prefabricated column 1 is not less than 200mm. The joint 23 is arranged in the bottom horizontal seam 4, and the height of the bottom horizontal seam 4 is controlled by the column legs 26.

In one structure of the present invention, protrusions 14 are arranged at the bottom of the prefabricated column 1 to ensure the compactness of the bottom horizontal joint 4 and the post-cast concrete 24 near the bottom surface of the prefabricated column 1, and to improve the shear resistance of the bottom horizontal joint 4. The protrusions 14 The height of the protruding prefabricated column 1 is not less than 30mm, and slopes are arranged around it.

When the side length of the prefabricated column 1 of the present invention is greater than 700 mm, one or more casting holes 16 can be pre-buried in the middle of the cross-section of the prefabricated column 1 to form one or more pouring holes 16. The pouring concrete 24 is poured densely; the cross-section of the pouring hole 16 is circular or other shapes, and the maximum dimension of the edge from the four sides of the prefabricated column 1 is not less than 90mm; no longitudinal reinforcement is arranged in the pouring hole 16 at the construction site.

1 to 9 show a preferred embodiment 1 of the present invention. As shown in FIGS. 1 to 3 , only four corners of the prefabricated column 1 are pre-embedded in the hexagonal shaped pipes 12 shown in FIG. 3 to form through vertical holes 11 . The maximum dimension of the edge of the shaping pipe 12 from the four sides of the prefabricated column 1 is not less than 120mm, and is made of thin-walled steel plate, and the inner wall can be provided with protrusions to form a rough surface.

As shown in Figure 4, the prefabricated column stirrups are composite stirrups composed of large stirrups 133, small stirrups 134 and tie bars 135, wherein the large stirrups 133 and the small stirrups 134 are welded closed stirrups, and the small stirrups 134 have Four, each small stirrup 134 forms an enclosure for two adjacent vertical holes 11 , and strengthens the restraint effect on the stressed longitudinal ribs 21 centrally arranged in the vertical holes 11 . As shown in FIG. 2 and FIG. 4 , between the four corners of the large stirrup 133 and the shaping pipe 12, a structural longitudinal bar 131 with a diameter of 8 to 12 mm is arranged; the small stirrups 134 inside the vertical hole 11 are along the The distance between the limbs a in the horizontal direction is greater than 400mm. In the middle of the four sides of the prefabricated column 1, an auxiliary longitudinal bar 132 with a diameter of 10 to 14 mm is arranged to control the distance between the legs of the stirrup. Ribs 135 ; structural longitudinal ribs 131 , auxiliary longitudinal ribs 132 , large stirrups 133 , small stirrups 134 and ties 135 are bound or welded to form the prefabricated column reinforcement cage 13 shown in FIG. 4 . The diameters of the structural longitudinal bars 131 and the auxiliary longitudinal bars 132 are all structural requirements and do not change with the stress of the superimposed column. Therefore, the standardization and generalization of the prefabricated column reinforcement cage 13 of the prefabricated column 1 with the same cross-sectional size can be realized, which is convenient for industrial production. The structural longitudinal bars 131 or the auxiliary longitudinal bars 132 do not protrude from the bottom and top surfaces of the prefabricated column 1 and do not participate in the force calculation.

Figures 5, 7 and 8 provide schematic diagrams of the connection between the prefabricated column 1 and the lower structure. As shown in Figures 5 to 8, the stressed longitudinal bars 21 are centrally arranged in the corner vertical holes 11 of the prefabricated column 1 on the construction site. The steel bar joints 23 are mechanical connection joints, preferably straight threaded joints. The stressed longitudinal reinforcement 21 participates in the stress calculation, and the total reinforcement area meets the requirements for checking the flexural bearing capacity of the superimposed column, and also needs to meet the minimum reinforcement ratio requirements of the current code for the longitudinal reinforcement of the column under stress. The total number of stressed longitudinal ribs 21 in each vertical hole 11 is not more than four, and the diameter of the stressed longitudinal ribs 21 is not less than 16mm and should not be greater than 32mm. In FIGS. 5 to 8 , three are arranged in each vertical hole 11 Stressed longitudinal bars 21.

As shown in Figure 5, Figure 7 and Figure 8, the bottom of the prefabricated column 1 is provided with a bottom horizontal joint 4 with a height of not less than 60mm, a large stirrup 133 is arranged in the bottom horizontal joint 4, and concrete 24 is poured in the vertical hole 11 after pouring. At the same time, the pouring of the post-cast concrete 24 in the bottom horizontal joint 4 is completed. The height of the bottom horizontal joint 4 and the installation accuracy of the prefabricated column 1 are controlled by leveling bolts 25 , which are screwed into the pre-embedded internal thread sleeve 15 shown in FIG. 9 and embedded in the bottom of the prefabricated column 1 .

As shown in FIG. 9 , the protrusions 14 are provided at the bottom of the prefabricated column 1 to ensure the compactness of the bottom horizontal joint 4 and the post-cast concrete 24 near the bottom surface of the precast column 1, and the post-cast concrete 24 is formed in the protrusion 14 and the bottom horizontal joint 4 at the same time. Shear key to improve the shear resistance of the bottom horizontal seam 4. The height of the protrusion 14 protruding from the prefabricated column 1 is not less than 30mm, and slopes are arranged around it to avoid the formation of air bubbles in the upper part of the post-cast concrete 24 in the bottom horizontal joint 4 during the pouring process.

The on-site construction process of the preferred embodiment 1 is as follows: Step 1, place the large stirrups 133 in the bottom horizontal joint 4 at the root of the longitudinal reinforcement 22 of the lower column, and place the longitudinal reinforcement 21 and the lower column extending from the floor 3 The stressed longitudinal bars 22 are connected by steel joints 23 one by one; in step 2, the prefabricated column 1 is hoisted, and attention should be paid to control the position of the stressed longitudinal bars 21 to prevent it from interfering with the falling of the prefabricated column; Adjust the verticality of the prefabricated column 1 according to the height of the seam 4; step 4, move the large stirrup 133 in the bottom horizontal seam 4 to the design position and bind it with the longitudinal reinforcement 22 of the lower column; step 5, support the bottom The horizontal joint 4, through the vertical hole 11, completes the bottom horizontal joint 4 and the pouring of the post-cast concrete 24 in the vertical hole 11; Step 6, curing and removing the formwork, completing the connection between the prefabricated column 1 and the lower structure, and the prefabricated column 1 and the post-casting The concrete 24 and the stressed longitudinal bars 21 arranged in the vertical holes 11 form a superimposed column and participate in the stress of the structure as a whole.

When it is inconvenient to use the on-site construction and installation process of the preferred embodiment 1, at this time, as shown in Figure 10 and Figure 11, after the prefabricated column 1 is hoisted, the longitudinal reinforcement 21 and the floor slab 3 are drilled in the vertical hole 11. The lower column is connected by the longitudinal reinforcement 22. At this time, the height of the bottom horizontal joint 4 of the prefabricated column 1 is not less than 200mm, and two large stirrups 133 are arranged in the bottom horizontal joint 4. The steel bar joints 23 are arranged in the bottom horizontal joint 4 at the same height, and the height of the bottom horizontal joint 4 is controlled by the column legs 26 .

The on-site construction process of the superimposed column shown in Figure 10 and Figure 11 is as follows: step 1, place the large stirrups 133 in the bottom horizontal joint 4 at the root of the longitudinal reinforcement 22 of the lower column; step 2, place the column legs 26, Hoist the prefabricated column 1, use the column legs 26 to control the height of the bottom horizontal seam 4, and adjust the verticality of the prefabricated column 1; Step 3, in the vertical hole 11 from top to bottom, wear longitudinal reinforcement 21, and horizontally at the bottom The connection construction of the steel bar joint 23 is completed in the joint 4; step 4, the large stirrup 133 in the bottom horizontal joint 4 is moved upward to the design position and is bound and positioned with the longitudinal reinforcement 21 and the longitudinal reinforcement 22 of the lower column; step Fifth, the bottom horizontal joint 4 is supported, and the bottom horizontal joint 4 and the post-cast concrete 24 in the vertical hole 11 are completed through the vertical hole 11; Step 6, the maintenance and removal of the formwork are completed, and the connection between the prefabricated column 1 and the lower structure is completed. The column 1, the post-cast concrete 24 and the force-bearing longitudinal bars 21 arranged in the vertical hole 11 form a superimposed column and participate in the force bearing of the structure as a whole.

Fig. 12 and Fig. 13 are the modified version 1 of the vertical hole 11 of the superimposed column shown in Fig. 6. The four corners of the prefabricated column 1 are pre-embedded in the four corners of the prefabricated column 1. The shape of the cross-sectional shape is a rectangular shape. The vertical hole 11 is formed. Only the corners corresponding to the large stirrups 133 are cut to avoid the large stirrups 133 . The maximum dimension of the shaped pipe 12 parallel to the four sides of the prefabricated column 1 is not less than 120mm, and is made of thin-walled steel plate, and the inner wall can be provided with protrusions to form a rough surface. The arrangement of the structural reinforcement bars 131 of the prefabricated column 1 is the same as that of the first preferred embodiment.

Figures 14 and 15 show the second modification of the vertical hole 11 of the superimposed column shown in Figure 6. The four corners of the prefabricated column 1 are pre-embedded in the four corners of the prefabricated column 1. The shape of the cross-sectional shape is a rounded rectangle to form the vertical hole 11, and the shaped pipe 12 All four corners are rounded. The maximum dimension of the shaped pipe 12 parallel to the four sides of the prefabricated column 1 is not less than 120mm, and is made of thin-walled steel plate, and the inner wall can be provided with protrusions to form a rough surface. The structural steel bars 131 of the prefabricated column 1 are arranged at the intersection of the small stirrups 134 and the large stirrups 133 , and a total of eight structural steel bars 131 are arranged.

Figures 16 and 17 are the improved stirrups of the prefabricated columns shown in Figures 1 to 4. The welded stirrup mesh 136 is used to replace the composite composite composed of the large stirrups 133, the small stirrups 134 and the tie bars 135 in Figures 1 to 4. As the stirrups of the prefabricated column 1, the stirrups have the advantages of simple arrangement of stirrups and small amount of steel bars.

Figures 18 and 19 provide a schematic diagram of the structure of the present invention applied to a large-section superimposed column. When the side length of the prefabricated column 1 is greater than 700mm, one or more pouring holes can be formed by pre-embedding a shaped pipe or corrugated pipe in the middle of the section of the prefabricated column 1 16, Figures 18 and 19 are provided with two pouring holes 16, the pouring holes 16 pass through the height direction of the prefabricated column 1. The cross section of the pouring hole 16 is circular, and the diameter should not be less than 90mm, and no longitudinal reinforcement is arranged in the pouring hole 16 at the construction site. During on-site construction, the post-cast concrete 24 is poured into the bottom horizontal joint 4 through the vertical hole 11 and the pouring hole 16 at the same time, so as to ensure that the post-cast concrete 24 in the bottom horizontal joint 4 is densely poured.

Figure 20 provides a schematic diagram of the structure of the present invention applied to a small-section superimposed column. The distance a between the small stirrups 134 inside the vertical hole 11 along the horizontal direction is not greater than 400mm, and the middle of the four sides of the prefabricated column 1 is not provided with auxiliary longitudinal bars 132. In the column 1, only one structural longitudinal reinforcement 131 is provided at the four corners, the large stirrups 133 and the small stirrups 134 form the prefabricated column reinforcement cage 13, and no tie bars 135 are required.

Figures 21 and 22 provide a schematic diagram of the superimposed column structure in which four longitudinal reinforcement bars 21 are arranged in each vertical hole 11 of the prefabricated column 1. At this time, the cross-sectional shape of the shaping pipe 12 should be selected from the cutouts in Figures 21 and 22, respectively. The corner rectangle or rounded rectangle should not be the hexagon in Figure 2.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes and substitutions within the technical scope disclosed by the present invention, All should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. The superposed column is characterized in that each corner of the prefabricated column (1) is provided with a vertical hole (11), the stressed longitudinal bars (21) are arranged in each vertical hole (11) in a centralized manner in a construction site, bending resistance is provided for the superposed column, stirrups are arranged in the prefabricated column (1), stirrups are formed in prefabricated column concrete and post-cast concrete (24) under the constraint action of the stirrups, and elastic-plastic deformation capability is provided for the superposed column, the stressed longitudinal bars (21) and the stirrups are separately arranged, the post-cast concrete (24) is poured in the vertical holes (11), and the poured prefabricated column (1), the post-cast concrete (24) and the stressed longitudinal bars (21) form the integral superposed column and participate in structural stress.

2. The corner vertical hole centralized configuration stress longitudinal bar's of claim 1 superimposed column, characterized by that, the cross section of the said precast column (1) is rectangle, form the through vertical hole (11) after its four corners pre-buried shaping pipeline (12) pour precast column (1) concrete; the shaping pipeline (12) is made of a thin-wall steel plate through rolling and folding, the inner wall of the shaping pipeline is provided with a protrusion to form a rough surface, or a steel plate natural forming surface is adopted, the cross section of the shaping pipeline is hexagonal, corner cutting rectangular, round corner rectangular or circular, the cross section of the corresponding vertical hole (11) is hexagonal, corner cutting rectangular, round corner rectangular or circular, and the maximum size of the edge of the shaping pipeline (12) to the four sides of the prefabricated column (1) is not less than 120 mm.

3. The corner vertical hole centralized arrangement stress-bearing column according to claim 1 or 2 is characterized in that a construction longitudinal rib (131) or an auxiliary longitudinal rib (132) is arranged in the prefabricated column (1) to form a prefabricated column reinforcement cage (13) together with a stirrup, the diameters of the construction longitudinal rib (131) or the auxiliary longitudinal rib (132) are both construction requirements and are not changed along with the stress condition of the prefabricated column, and the construction longitudinal rib (131) or the auxiliary longitudinal rib (132) does not extend out of the bottom surface and the top surface of the prefabricated column (1) and does not participate in stress calculation;

the structural longitudinal ribs (131) are arranged at the corners or the intersection positions of the stirrups of the prefabricated column (1), the diameter of each structural longitudinal rib (131) is 8-12 mm, the number and the positions of the structural longitudinal ribs are determined according to the stirrups, and the structural longitudinal ribs are bound with the stirrups or welded and fixed; when the limb distance a of the stirrup on the inner side of the vertical hole (11) along the horizontal direction is not more than 400mm, auxiliary longitudinal ribs (132) are not arranged at the middle of each side of the prefabricated column (1); when the limb distance a of the stirrup on the inner side of the vertical hole (11) in the horizontal direction is larger than 400mm, the auxiliary longitudinal rib (132) is arranged in the middle of each edge of the prefabricated column (1) to control the limb distance of the stirrup, and the diameter of the auxiliary longitudinal rib (132) is 10-14 mm.

4. The corner vertical hole centralized configuration is a superposed column directly connected with stressed longitudinal bars according to claim 1, wherein the stirrups adopt composite stirrups formed by large stirrups (133), small stirrups (134) and tie bars (135) or adopt welded stirrup networks (136), wherein the large stirrups (133) and the small stirrups (134) adopt welded closed hoops, the small stirrups (134) are arranged in each layer and respectively form constraint on adjacent vertical holes (11), and the large stirrups (133) form constraint on all the vertical holes (11).

5. The corner vertical hole centralized configuration direct connection atress longitudinal reinforcement's superimposed column according to claim 1 or 4, characterized in that, when prefabricated post (1) length of side is greater than 700mm, pre-buried design pipeline or bellows in prefabricated post (1) cross-section middle part form run through prefabricated post (1) high direction pouring hole (16), guarantee bottom horizontal joint (4) post-cast concrete (24) pour closely; the maximum size of the cross section of the pouring hole (16) away from the four sides of the prefabricated column (1) is not less than 90 mm; longitudinal bars are not distributed in the construction site pouring holes (16).

6. The corner vertical hole centralized configuration stress longitudinal bar laminated column according to claim 1, characterized in that, the stress longitudinal bar (21) laid in each vertical hole (11) is not more than four, the stress longitudinal bar (21) participates in stress calculation, the diameter is not less than 16mm and not more than 32mm, the reinforcement area meets the laminated column bending bearing capacity check calculation requirement, and the minimum reinforcement ratio requirement of the current standard to the column stress longitudinal bar is required to be met; the upper and lower stressed longitudinal bars (21) are connected by steel bar joints (23), and the steel bar joints (23) are mechanical connection joints and are arranged at the same height or staggered by a certain distance along the height.

7. The corner vertical hole centralized configuration is with the superimposed column of direct connection atress longitudinal reinforcement according to claim 1, characterized by, set up arch (14) in prefabricated post (1) bottom and guarantee bottom horizontal joint (4) and the near prefabricated post (1) bottom post-cast concrete's (24) compactness, improve bottom horizontal joint (4) shear resistance, the height that arch (14) extrudes prefabricated post (1) is not less than 30mm, set up the inclined plane all around.

8. The construction process of the composite column with the corner vertical holes intensively configured with the stressed longitudinal bars directly connected is characterized in that each corner of the prefabricated column (1) is respectively provided with a through vertical hole (11), the stressed longitudinal bars (21) are intensively arranged in each vertical hole (11) at a construction site to provide bending resistance for the composite column, the prefabricated column (1) is provided with the stirrups to form a stirrup restraining effect on prefabricated column concrete and post-cast concrete (24) and provide elastic-plastic deformation capability for the composite column, wherein the stressed longitudinal bars (21) and the stirrups are separately configured, the post-cast concrete (24) is cast in the vertical holes (11), and the cast prefabricated column (1), the post-cast concrete (24) and the stressed longitudinal bars (21) form the integral composite column to participate in structural stress.

9. The construction process according to claim 8, wherein the precast column (1) is hoisted after the stressed longitudinal bar (21) is connected with the lower-layer column stressed longitudinal bar (22) extending out of the floor slab (3), the height of the horizontal joint (4) at the bottom of the precast column (1) is not less than 60mm, the steel bar joint (23) is arranged in the vertical hole (11), the height of the horizontal joint (4) at the bottom and the installation precision of the precast column (1) are controlled through the leveling bolt (25), and the leveling bolt (25) is screwed into the embedded internal thread sleeve (15) embedded at the bottom of the precast column (1); or after the hoisting of prefabricated post (1) is accomplished, wear to establish the atress in vertical hole (11) and indulge muscle (22) and be connected with lower floor's post atress that floor (3) stretch out, prefabricated post (1) bottom horizontal joint (4) height is not less than 200mm, lays twice big stirrup (133) in bottom horizontal joint (4), and bar joint (23) are laid in bottom horizontal joint (4), through the height of post leg (26) control bottom horizontal joint (4).

10. The construction process according to claim 9, wherein when the prefabricated column is connected and hoisted, the large stirrups (133) in the horizontal bottom joints (4) are placed at the roots of the stressed longitudinal reinforcements (22) of the lower column, the stressed longitudinal reinforcements (21) and the stressed longitudinal reinforcements (22) of the lower column extending out of the floor slab (3) are connected one by one through the reinforcement joints (23), then the prefabricated column (1) is hoisted, the installation precision of the prefabricated column (1) is calibrated by adjusting the leveling bolts (25), and then the large stirrups (133) in the horizontal bottom joints (4) are moved upwards to the designed position and are bound and positioned with the stressed longitudinal reinforcements (22) of the lower column; then, a bottom horizontal joint (4) is erected, and the bottom horizontal joint (4) and the post-cast concrete (24) in the vertical hole (4) are poured through the vertical hole (11); finally, maintaining and removing the mold to complete the connection between the prefabricated column (1) and the lower-layer structure;

when hoisting and connecting, the large stirrup (133) in the horizontal seam (4) at the bottom is placed at the root of the stressed longitudinal rib (22) of the lower-layer column; then placing the column legs (26), hoisting the prefabricated column (1), and adjusting the installation precision of the prefabricated column (1); then, a stressed longitudinal bar (21) penetrates through the vertical hole (11) from top to bottom, connection construction of a steel bar joint (23) is completed in the bottom horizontal joint (4), then a large stirrup (133) in the bottom horizontal joint (4) is moved upwards to a designed position and is bound and positioned with the stressed longitudinal bar (21) and the lower-layer column stressed longitudinal bar (22), then the bottom horizontal joint (4) is erected, and pouring of post-cast concrete (24) in the bottom horizontal joint (4) and the vertical hole (11) is completed through the vertical hole (11); and finally, maintaining and removing the mold to complete the connection of the prefabricated column (1) and the lower-layer structure.

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