CN114809772B - Construction method of assembled column connecting joint and connecting joint - Google Patents

Abstract

The invention provides a construction method of an assembly type column connecting node and the connecting node, comprising the following steps: pouring and maintaining a cast-in-place node area at the top of the lower-layer prefabricated column; a template is sleeved on the top of the cast-in-place node area and surrounds the part, extending out of the top of the cast-in-place node area, of the lower-layer precast column longitudinal bar, and the template and the top surface of the cast-in-place node area form an accommodating space with an upward opening and capable of pouring concrete mortar; pouring concrete mortar into the accommodating space through the opening; aligning and inserting the positioning component extending out of the bottom of the upper-layer prefabricated column into the concrete mortar through the opening, and supporting the bottom of the upper-layer prefabricated column on the top of the template; and curing the concrete mortar. The invention can solve the problems of poor construction quality and low construction precision of the connecting joint of the prefabricated column.

Description

Construction method and connection node of assembled column connection node

technical field

The invention relates to the technical field of prefabricated structures, and more particularly, relates to a construction method of prefabricated column connection nodes.

Background technique

At present, the wide application of prefabricated structures in my country is an important line to promote the development of prefabricated buildings and realize the industrialization of the construction industry. Compared with the original cast-in-place concrete structure, it has stable quality, high construction efficiency, less total project construction cost, and reduced environmental pollution. a bit. Among the existing prefabricated columns, the connection methods between prefabricated concrete columns mainly adopt grouting sleeve connection and anchor grout lap connection, or add section steel connectors to the nodes to realize the connection. The construction cost of the above several connection methods increase, the construction process is complicated, and the construction accuracy is difficult to guarantee, and the node quality inspection after construction is difficult.

Contents of the invention

The present invention aims to overcome at least one defect (deficiency) of the above-mentioned prior art, and provides a construction method and connection node of a prefabricated column connection, which are used to solve the problems of poor construction quality and low construction accuracy of the connection node of an assembled prefabricated column .

The technical scheme that the present invention takes is:

In the first aspect, the present invention provides a construction method for a prefabricated column connection node, including:

Pour and maintain the cast-in-place node area on the top of the lower prefabricated column;

On the top of the cast-in-place node area, a formwork is set around the part of the lower precast column longitudinal reinforcement protruding from the top of the cast-in-place node area, and the formwork and the top surface of the cast-in-place node area form an open and upward The accommodation space for pourable concrete mortar;

pouring concrete mortar into the accommodation space through the opening;

Align and insert the positioning parts protruding from the bottom of the upper prefabricated column through the opening into the concrete mortar, and support the bottom of the upper prefabricated column on the top of the template;

The concrete mortar is cured.

Optionally, before aligning and inserting the positioning part protruding from the bottom of the upper prefabricated column through the opening into the concrete mortar, it further includes:

Set shear reinforcement hoops on the positioning parts protruding from the bottom of the upper prefabricated column;

Or, before setting the formwork on the top of the cast-in-place node area and around the part of the lower precast column longitudinal reinforcement protruding from the top of the cast-in-place node area, it also includes:

The shear reinforcement is hooped at the top of the cast-in-place node area where the longitudinal reinforcement of the lower prefabricated column extends.

Optionally, a cast-in-place node area is poured and cured on top of the lower precast columns, including:

Stirrups are set on the part where the longitudinal reinforcement of the lower prefabricated column protrudes from the top of the lower prefabricated column and extends into the cast-in-place node area;

Pouring the cast-in-place node area;

The cast-in-place node area is maintained.

Optionally, pouring concrete mortar into the accommodation space through the opening includes:

Concrete mortar is poured into the accommodation space through the opening, so that at least half of the accommodation space is poured with the concrete mortar.

Optionally, pouring concrete mortar into the accommodation space through the opening includes:

Concrete mortar is poured into the accommodation space through the opening, so that the concrete mortar in the accommodation space will overflow when the positioning component is inserted.

Optionally, the positioning component includes a part that protrudes from the bottom of the upper precast column after the longitudinal reinforcement of the upper prefabricated column is bent inward, and the depth of the positioning component inserted into the concrete mortar is greater than or equal to satisfy the requirements of the upper layer. The minimum length required for the anchorage of longitudinal reinforcement of precast columns.

Optionally, the height of the template is greater than or equal to the sum of the height of the positioning component and the thickness of the protective layer protecting the positioning component.

Optionally, at the top of the cast-in-place node area and around the lower prefabricated column extending the longitudinal reinforcement at the top of the cast-in-place node area to set the template, before pouring concrete mortar into the accommodation space through the opening ,Also includes:

fixing the position of the formwork by supports;

After curing the concrete mortar, also include:

The supports are removed and, when the formwork is detachable, the formwork is disassembled.

Optionally, after pouring and curing the cast-in-situ node area on the top of the lower prefabricated column, before pouring concrete mortar into the accommodation space through the opening, the method further includes:

The top surface of the cast-in-place node area is roughened.

In a second aspect, the present invention provides an assembled column connection node, comprising an upper prefabricated column and a lower prefabricated column, the upper prefabricated column and the lower prefabricated column are respectively provided with longitudinal reinforcement and stirrup, and the upper prefabricated column and the lower prefabricated column are respectively provided with There are cast-in-place node areas between the lower precast columns, and the upper precast columns are provided with positioning parts, and the positioning parts extend out from the bottom of the upper precast columns; the upper part of the longitudinal reinforcement of the lower precast columns extends into The cast-in-place node area protrudes from the top of the cast-in-place node area, and the connection node is constructed by using the construction method of the fabricated column connection node according to any one of claims 1 to 5.

Compared with the prior art, the beneficial effect of the present invention is: the positioning part protruding from the bottom of the upper prefabricated column is inserted into the concrete mortar, and the longitudinal reinforcement protruding from the top of the lower prefabricated column is also inserted into the concrete mortar, so that the prefabricated column is connected to the node The construction operation is more convenient, the construction quality is easier to guarantee, and the construction accuracy is improved.

Description of drawings

Fig. 1 is the flowchart of embodiment 1 assembly type column connection node construction method

Fig. 2 is a schematic diagram of the connection node of the assembled column after the construction of the first embodiment is completed.

Fig. 3 is an enlarged view of A in Fig. 2 .

Fig. 4 is a flow chart of pouring and maintaining the cast-in-place node area in Step S10 of Embodiment 1.

Fig. 5 is a schematic diagram of the connection node of the prefabricated column after the formwork is set in Example 1.

Fig. 6 is a schematic diagram of a prefabricated column connection node after construction in Embodiment 2.

Fig. 7 is a schematic diagram of a prefabricated column connection node after construction in Embodiment 3.

Description of drawings: 100-upper precast column; 111-longitudinal reinforcement of upper precast column; 112-stirrup of upper precast column; 113-bump; 200-lower precast column; 211-longitudinal reinforcement of lower precast column; Stirrups of lower prefabricated columns; 300-cast-in-place node area; 310-burrs; 410-formwork; 411-reinforcing reinforcement; 420-concrete mortar; 430-opening; 440-accommodating space.

Detailed ways

The accompanying drawings of the present invention are only for illustrative purposes, and should not be construed as limiting the present invention. In order to better illustrate the following embodiments, some components in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, some known structures and their descriptions in the drawings may be omitted. understandable.

Example 1

This embodiment provides a construction method for a prefabricated column connection node, which is used for constructing the prefabricated column connection node. The prefabricated integral concrete structure is an integral structure formed by prefabricated concrete components or components connected by steel bars, connectors or prestressed and cast concrete on site. A cast-in-place node area will be formed at the joints where the prefabricated components are connected.

The prefabricated column connection node constructed in this embodiment is the connection node between the upper prefabricated column and the lower prefabricated column, both of which are prefabricated concrete structures. Fig. 1 is a flowchart of the construction method of the prefabricated column connection node in this embodiment, Fig. 2 is a schematic diagram of the prefabricated column connection node after the construction of this embodiment is completed, and Fig. 3 is an enlarged view of A in Fig. 2 . As shown in Figures 1 to 3, the construction method of the prefabricated column connection node includes:

S10. Pour and maintain the cast-in-place node area 300 on the top of the lower prefabricated column 200 .

The cast-in-place node area 300 is located between the upper prefabricated column 100 and the lower prefabricated column 200 . Before the upper prefabricated columns 100 are assembled, the pouring and curing of the cast-in-place node areas 300 need to be completed.

The lower prefabricated column 200 needs to be firmly connected to the structure on the top, and the longitudinal reinforcement 211 of the lower prefabricated column 200 needs to extend into the cast-in-place node area 300 . Therefore, as shown in FIGS. 2 to 4, step S10 specifically includes:

S11. Set stirrups 212 on the part where the longitudinal reinforcement 211 of the lower precast column 200 protrudes from the top of the lower precast column 200 and extends into the cast-in-place node area 300;

S12. Pouring the cast-in-place node area 300;

S13. Maintain the cast-in-place node area 300.

The lower prefabricated column 200 as a precast concrete structure is provided with longitudinal reinforcements 211 and stirrups 212 hooped to the longitudinal reinforcements 211 . The upper part of the longitudinal reinforcement 211 of the lower precast column 200 protrudes beyond the top of the lower precast column 200 and extends into the cast-in-place node area 300 . After the prefabrication of the lower precast column 200 is completed, the part where the longitudinal reinforcement 211 of the lower precast column 200 protrudes from the top of the lower precast column 200 has not yet been hooped with hoops 212. Stirrups 212 should be provided for the part where the longitudinal reinforcement 211 of the lower precast column 200 protrudes from the top of the lower precast column 200 and extends into the cast-in-place node area 300 .

In a specific implementation process, when beams and/or slabs may be provided between the upper prefabricated column 100 and the lower prefabricated column 200, the beams and slabs may be prefabricated or cast-in-place respectively. In order to realize the fastening of the beam ends, the longitudinal reinforcement of the beam can also be extended into the cast-in-place joint area 300 . At this time, before pouring the cast-in-place joint area 300 , the longitudinal reinforcement of the beam should be set up first.

S20. Set a formwork 410 on the top of the cast-in-place node area 300 and surround the lower prefabricated column 200 longitudinal ribs 211 protruding from the top of the cast-in-place node area 300. The formwork 410 and the top surface of the cast-in-place node area 300 form an opening 430 Upward receiving space 440 for pourable concrete mortar 420 .

Exemplarily, FIG. 5 is a schematic diagram of the prefabricated column connection node after the template 410 is set. As shown in Figure 5, the template 410 forms the side enclosure of the accommodation space 440, the top surface of the cast-in-place node area 300 forms the bottom enclosure of the accommodation space 440, and the top surface of the accommodation space 440 is not enclosed but forms an upward opening 430. The formwork 410 can be directly placed on the top of the cast-in-place node area 300, which facilitates the setting of the formwork 410 during construction. The formwork 410 can also be inserted on top of the cast-in-place node area 300 to optimize the fixing effect of the formwork 410 . The accommodation space 440 formed by the template 410 and the top surface of the cast-in-place node area 300 can wrap the part of the longitudinal ribs 211 of the lower prefabricated column 200 protruding from the top of the cast-in-place node area 300 .

During construction, when the concrete mortar 420 is not solidified, the formwork 410 is easily subjected to a relatively large lateral force. Under different working conditions of the connection nodes, the template 410 is also susceptible to a certain degree of lateral force. In order to further ensure the stability and safety of the formwork 410 during the construction process and after the construction is completed, in an optional embodiment, the formwork 410 is a concrete structure, and the inside of the formwork 410 is provided with reinforcing steel bars around the central ring of the accommodation space 440 411.

After step S20 forms the accommodating space 440 where the concrete mortar 420 can be poured with the opening 430 upward, it may further include: roughening the top surface of the cast-in-place node area 300 .

The top surface of the cast-in-place node area 300 is roughened so that burrs 310 are formed on the top surface of the cast-in-place node area 300 , which can strengthen the connection between the cast-in-place node area 300 and the concrete mortar 420 subsequently poured in the accommodation space 440 .

S30 . Pouring concrete mortar 420 into the accommodation space 440 through the opening 430 .

After the formwork 410 is sleeved and forms an accommodation space 440 with the top surface of the cast-in-place node area 300 , concrete can be poured into the accommodation space 440 through the opening 430 . The poured concrete mortar 420 can be selected with good workability, so as to facilitate the alignment and insertion of the positioning parts at the bottom of the upper prefabricated column 100 later.

In an optional embodiment, the concrete mortar 420 poured in the accommodation space 440 cannot be too little, and the concrete mortar 420 is poured into the accommodation space 440 through the opening 430, so that at least half of the accommodation space 440 is poured with the concrete mortar 420, by This enables the concrete mortar 420 to better wrap the positioning components at the bottom of the upper prefabricated column 100 inserted later.

In another optional embodiment, the concrete mortar 420 is poured into the receiving space 440 through the opening 430, so that the concrete mortar 420 in the receiving space 440 will overflow when the positioning component is inserted, and the overflowing concrete mortar 420 can make the subsequently inserted The positioning parts at the bottom of the upper prefabricated column 100 are better wrapped.

S40 . Align and insert the positioning part protruding from the bottom of the upper prefabricated column 100 into the concrete mortar 420 through the opening 430 , and directly support the bottom of the upper precast column 100 on the top of the template 410 .

The positioning part at the bottom of the upper precast column 100 is inserted into the concrete mortar 420 in the accommodation space 440 to realize the positioning of the upper precast column 100. The bottom of the upper precast column 100 can be directly supported on the top of the formwork 410. After the concrete mortar 420 solidifies, it can realize the positioning of the upper precast column 100. Reliable connection of the upper prefabricated column 100.

When the concrete mortar 420 in the accommodation space 440 is sufficient, the positioning part at the bottom of the upper prefabricated column 100 is inserted into the concrete mortar 420 to make the concrete mortar 420 overflow the accommodation space 440, and there will be concrete mortar in the gap between the bottom of the upper prefabricated column 100 and the template 410 420, the bonding between the upper prefabricated column 100 and the template 410 can be enhanced.

When the positioning part at the bottom of the upper prefabricated column 100 is inserted into the concrete mortar 420 of the accommodation space 440, a protective layer thickness can be reserved between the bottom of the positioning part and the top surface of the cast-in-place node area 300 to better protect the defined part. Therefore, the height of the template 410 ( h in FIG. 3 ) is greater than or equal to the sum of the height of the positioning component ( l ₁ in FIG. 3 ) and the thickness of the protective layer protecting the positioning component ( c in FIG. 3 ).

In an optional embodiment, the positioning component may include the part where the longitudinal ribs 111 of the upper precast column 100 are bent inward and protrude from the bottom of the upper precast column 100 .

Since the positioning component must meet certain anchoring requirements, the depth of the positioning component inserted into the concrete mortar 420 is greater than or equal to the minimum length that meets the anchoring requirements of the longitudinal reinforcement 111 of the upper precast column 100 .

S50. Curing concrete mortar 420.

After the positioning and installation of the upper prefabricated column 100 is completed, the concrete mortar 420 can be maintained.

In an optional embodiment, step S20 is at the top of the cast-in-place node area 300 and after the formwork 410 is set around the lower prefabricated column 200 protruding from the top of the cast-in-place node area 300 longitudinal ribs 211, step S30 passes through the opening 430 Before pouring the concrete mortar 420 into the accommodating space 440 , it may further include: fixing the position of the template 410 by supporting. After curing the concrete mortar 420 in step S50, it may further include: removing the support, and disassembling the formwork 410 when the formwork 410 is detachable.

When the concrete mortar 420 is not solidified, in order to further ensure the reliability of the formwork 410, the formwork 410 can be fixed by supports, such as diagonal braces, and the supports can be removed after the concrete mortar 420 is solidified.

For the sake of aesthetics, the formwork 410 can be designed to be detachable, and the formwork 410 can be disassembled after the concrete mortar 420 is solidified. At this time, the formwork 410 can be an aluminum formwork or a wood formwork. When the form 410 is not detachable, the form 410 may be a concrete form.

Using the construction method provided in this embodiment, the positioning components of the upper precast column 100 and the longitudinal reinforcement 211 of the lower precast column 200 are inserted into the concrete mortar 420, so that the construction operation is simple and the construction quality is easy to ensure.

Example 2

This embodiment provides a construction method for a prefabricated column connection node, which is used for constructing the prefabricated column connection node. The difference between this embodiment and Embodiment 1 is that, before step S40 , it also includes: hooping the shear reinforcement 412 on the positioning part protruding from the bottom of the upper prefabricated column 100 .

Fig. 6 is a schematic diagram of the assembled column connection node after the construction of this embodiment is completed. As shown in Fig. 6, the shear reinforcement 412 is hooped on the positioning part. Specifically, the positioning component includes the part where the longitudinal reinforcement 111 of the upper precast column 100 is bent inward and protrudes from the bottom of the upper precast column 100 , and the shear steel bar 412 is hooped on this part.

Example 3

This embodiment provides a construction method for a prefabricated column connection node, which is used for constructing the prefabricated column connection node. The difference between this embodiment and Embodiment 1 is that before step S20, it also includes: hooping shear reinforcement 412 at the part where the longitudinal reinforcement 211 of the lower prefabricated column 200 protrudes from the top of the cast-in-place node area 300 .

As shown in FIG. 2 and FIG. 3 , the shear reinforcement 412 is hooped on the longitudinal reinforcement 211 of the lower prefabricated column 200 .

Example 4

Based on the same inventive concept, this embodiment also provides a prefabricated column connection node, as shown in Figure 2 and Figure 3, which includes an upper prefabricated column 100 and a lower prefabricated column 200, and the lower prefabricated column 200 is provided with longitudinal reinforcement 211 and hoops Rib 212, a cast-in-place node area 300 is provided between the upper precast column 100 and the lower precast column 200, the upper precast column 100 is provided with a positioning component, and the positioning component protrudes from the bottom of the upper precast column 100, and the longitudinal rib 211 of the lower precast column 200 The upper part extends into the cast-in-place node area 300 and extends to the top of the cast-in-place node area 300, and the connection node is constructed by the above-mentioned prefabricated column connection node construction method.

The longitudinal reinforcement 211 of the lower precast column 200 will extend into the cast-in-place node area 300, thereby making the top of the lower precast column 200 and the structure on the top of the lower precast column 200 form a fixed connection; the positioning part at the bottom of the upper precast column 100 is inserted into the template 410 and The accommodation space 440 formed on the top surface of the cast-in-place node area 300 is wrapped and connected by the concrete mortar 420 in the accommodation space 440, so that the bottom of the upper prefabricated column 100 and the structure at the top of the lower prefabricated column 200 form a hinge joint, compared to the fixed joint In other words, the hinged form reduces the requirements on the joint construction quality, which makes it easier to guarantee the construction quality of the middle and upper prefabricated columns 100 assembly process on the construction site. Moreover, compared with the prefabricated columns whose bottom and top are fixed, the prefabricated columns with hinged bottom and fixed top have better energy dissipation characteristics and can be better applied in seismic design.

Fig. 7 is a schematic diagram of another assembled column connection node after construction of this embodiment is completed. As shown in Figure 7, in an optional embodiment, the upper prefabricated column 100 is also provided with a protrusion 113, the protrusion 113 protrudes from the bottom of the upper prefabricated column 100, and the protruding protrusion 113 wraps the part protruding from the bottom of the upper prefabricated column 100. Positioning parts. Specifically, the longitudinal ribs 111 of the upper prefabricated column 100 in the positioning component are bent inwardly, and the part protruding from the bottom of the upper precast column 100 extends into the inside of the protrusion 113 . The protrusion 113 can better protect the positioning component, and it is more convenient to insert the concrete mortar 420 in the receiving space 440 .

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solution of the present invention, rather than limiting the specific implementation manner of the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the claims of the present invention shall be included in the protection scope of the claims of the present invention.

Claims (6)

1. A construction method for a prefabricated column connection node, characterized in that, comprising: Pour and maintain the cast-in-place node area on the top of the lower prefabricated column; On the top of the cast-in-place node area, a formwork is set around the part of the lower precast column longitudinal reinforcement protruding from the top of the cast-in-place node area, and the formwork and the top surface of the cast-in-place node area form an open and upward The accommodation space for pourable concrete mortar; pouring concrete mortar into the accommodation space through the opening; Align and insert the positioning parts protruding from the bottom of the upper prefabricated column through the opening into the concrete mortar, and support the bottom of the upper prefabricated column on the top of the template; curing the concrete mortar; Pour and maintain the cast-in-place node area on top of the lower prefabricated columns, including: Stirrups are set on the part where the longitudinal reinforcement of the lower prefabricated column protrudes from the top of the lower prefabricated column and extends into the cast-in-place node area; Pouring the cast-in-place node area; Maintaining the cast-in-place node area; pouring concrete mortar into the accommodation space through the opening, including: pouring concrete mortar into the accommodation space through the opening, so that the concrete mortar in the accommodation space will overflow when the positioning component is inserted; The positioning part includes the part that protrudes from the bottom of the upper precast column after the longitudinal reinforcement of the upper precast column is bent inward, and the depth of the positioning part inserted into the concrete mortar is greater than or equal to satisfy the requirements of the longitudinal reinforcement of the upper precast column. The minimum length required for anchorage. 2. The construction method of a prefabricated column connection node according to claim 1, characterized in that, before aligning and inserting the positioning parts protruding from the bottom of the upper prefabricated column through the opening into the concrete mortar, further comprising: : Set shear reinforcement hoops on the positioning parts protruding from the bottom of the upper prefabricated column; Or, before setting the formwork on the top of the cast-in-place node area and around the part of the lower precast column longitudinal reinforcement protruding from the top of the cast-in-place node area, it also includes: The shear reinforcement is hooped at the top of the cast-in-place node area where the longitudinal reinforcement of the lower prefabricated column extends. 3. The construction method of a prefabricated column connection node according to claim 1, wherein the height of the template is greater than or equal to the sum of the height of the positioning part and the thickness of the protective layer protecting the positioning part. 4. The construction method of a prefabricated column connection node according to claim 1, characterized in that, at the top of the cast-in-place node area, and around the lower prefabricated column, extend the longitudinal reinforcement at the top of the cast-in-place node area After setting the formwork, before pouring concrete mortar into the accommodation space through the opening, it also includes: fixing the position of the formwork by supports; After curing the concrete mortar, also include: The supports are removed and, when the formwork is detachable, the formwork is disassembled. 5. The construction method of a prefabricated column connection node according to claim 1, characterized in that, after the top of the lower prefabricated column is poured and the cast-in-situ node area is maintained, concrete is poured into the accommodation space through the opening Before the mortar, also include: The top surface of the cast-in-place node area is roughened. 6. An assembled column connection node, comprising an upper prefabricated column and a lower prefabricated column, the upper prefabricated column and the lower prefabricated column are respectively provided with longitudinal bars and stirrups, the upper prefabricated column and the lower prefabricated column There is a cast-in-place node area between them, and it is characterized in that the upper prefabricated column is provided with a positioning part, and the positioning part protrudes from the bottom of the upper precast column; the upper part of the longitudinal reinforcement of the lower prefabricated column extends into the The cast-in-place node area protrudes from the top of the cast-in-place node area, and the connection node is constructed by using the construction method of the fabricated column connection node as described in any one of claims 1 to 5.

Images