Fabricated building beam column cast-in-place joint construction method

Abstract

The invention discloses an assembly type building beam column cast-in-place joint construction method which sequentially comprises the steps of construction preparation, beam column joint formwork manufacturing and installing, concrete pouring and formwork dismantling. In the construction preparation stage, bolt sleeves are correspondingly arranged on the left side and the right side of the end, close to a column, of a precast beam; the threaded holes corresponding to the bolt sleeves are formed in the formwork in the beam-column joint formwork manufacturing stage, the formwork can be fixed to the precast beam only through threaded connection of the bolts and the bolt sleeves, and the construction difficulty is reduced; a lifting ring is arranged on the formwork in the beam-column joint formwork manufacturing stage, a formwork removal hole is reserved in an upper floor in the concrete pouring stage, and therefore in the formwork removal stage, the formwork can be removed only by penetrating a formwork removal tool through the formwork removal hole, and the formwork can be lowered to the lower ground through a lifting rope penetrating through the formwork removal hole; the climbing operation risk and the construction operation difficulty in the form removal stage are reduced, and the construction efficiency is improved; and the template can be used for many times, so that the material turnover rate is improved, and the cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for constructing cast-in-place nodes of assembled building beams and columns. Background Art

[0002] In the development of the construction industry, the application of prefabricated buildings is becoming more and more extensive. In the prior art, when constructing prefabricated beams and columns, the beam and column components themselves and the template are used to form a formwork assembly that can directly cast the node, such as a prefabricated building prefabricated beam and column cast-in-place node mold and a formwork method disclosed in Chinese patent CN 108005380A, which is a prefabricated building prefabricated beam and column cast-in-place node mold, including a prefabricated column and a prefabricated beam, the end of the prefabricated column is fixed with a channel steel clamp for erecting the prefabricated beam, the prefabricated beam is erected on the channel steel clamp, and two adjacent prefabricated beams are fixedly connected by a W-shaped fixed back rib; the connection node of the prefabricated beam and the prefabricated column is fixed with a template, and the end faces of the prefabricated beam and the prefabricated column are enclosed with the template to form a rectangular body with an open top, and the angle of each corner of the W-shaped fixed back rib is 90 degrees. The multiple prefabricated beams and templates erected on the prefabricated columns are tightly fixed and connected as one through the W-shaped fixed back ribs, and the prefabricated beam-column components themselves and the templates are used to form a formwork assembly that can directly cast the nodes, and channel steel clamps are set on the prefabricated columns to increase the lap length of the prefabricated beams, enhance the lap stability of the formwork assembly, and restrict each other between the components. No redundant support structure is required, saving a lot of materials. However, the mold installation and disassembly in this patent are cumbersome, and the operator needs to work at high altitude when disassembling the mold, which not only reduces the construction efficiency, but also increases the risk of workers working at height. Summary of the invention

[0003] In view of the defects existing in the prior art, the present application provides a construction method for cast-in-place nodes of prefabricated building beams and columns, so as to solve the technical problems in the prior art of cast-in-place nodes of prefabricated building beams and columns, such as cumbersome installation and disassembly of molds, difficult construction work, need for high-altitude work when removing the molds, low construction efficiency, and high risk of high-altitude work.

[0004] In order to achieve the purpose of the above invention, the technical solution provided by the present invention is as follows:

[0005] A method for constructing cast-in-place joints of assembled building beams and columns, comprising the following steps:

[0006] S1. Construction preparation: make precast beams and construct cast-in-place columns simultaneously on site. After the construction of precast beams and columns is completed and reaches the designed strength, and all preparations are complete, the precast beams are hoisted into place and placed on the top of the columns. Bolt sleeves are correspondingly provided on the left and right sides of the end of the precast beam close to the column;

[0007] S2. Make and install the beam-column node template: Make the template according to the size of the node, precast beam and column, and set the threaded holes corresponding to the bolt sleeves on the template. The bolts pass through the threaded holes and are threadedly connected with the bolt sleeves to fix the template on the precast beam. A beam-column node cast-in-place area is formed between the template and the top of the precast beam and column, and a lifting ring is set on the template;

[0008] S3. Concrete pouring: pour the upper floor slab concrete and the beam-column joints and maintain them until they reach the required strength. When laying the floor slab, reserve a demolding hole on each side of the floor slab near the beam-column joint. The lifting rope and demolding tool can pass through the demolding hole at the same time. The demolding tool can pass through the demolding hole to separate the bolt from the bolt sleeve.

[0009] S4, formwork removal: After the formwork removal conditions are met, the lifting rope passes through the formwork removal hole reserved in advance on the upper floor slab and is fixedly connected to the lifting ring on the formwork. The formwork removal tool passes through the formwork removal hole to loosen the bolts that fix the formwork. The formwork is removed piece by piece, and the formwork is lowered to the ground below by the lifting rope. After the formwork removal of the beam-column node is completed, the floor slab holes and bolt sleeves are sealed.

[0010] In one embodiment, in step S1, before manufacturing the precast beam, the steel bars of the beam-column joints are pre-arranged through BIM.

[0011] In one embodiment, in step S1, a column cap and a beam pad are provided at the top end of the column, and the prefabricated beam is placed on the column cap or the beam pad of the column.

[0012] In one embodiment, in step S1, two or more bolt sleeves arranged in the vertical direction are provided on one side of the precast beam, and the bolt sleeves of adjacent precast beams have the same horizontal height.

[0013] In one embodiment, in step S2, the template is a spliced ​​W-shaped standardized steel template with each corner angle being 90 degrees, the threaded holes are arranged on the outermost steel plate of the template, and the model of the bolts is M14.

[0014] In one embodiment, in step S2, before installing the template, the template needs to be cleaned and coated with a release agent, and a foam adhesive strip is pasted on the joint between the template and the contact surface of the prefabricated beam.

[0015] In one embodiment, in step S3, the demolding hole is a through hole with a square cross-section, the vertical center line of the demolding hole is parallel to the vertical center line of the end of the bolt sleeve, and the horizontal center line of the demolding hole is parallel to the horizontal center line of the precast beam.

[0016] In one embodiment, the distance between the demolding hole and the template is 150mm-250mm, and the length and width of the demolding hole are 200mm×200mm.

[0017] Compared with the prior art, this application has at least the following beneficial effects:

[0018] The method for constructing cast-in-place joints of prefabricated building beams and columns in the present invention provides bolt sleeves on the left and right sides of the ends of the prefabricated beams close to the columns in the construction preparation stage, and provides threaded holes corresponding to the bolt sleeves on the template in the stage of making the beam-column joint template. The template can be fixed to the prefabricated beam through the threaded connection between the bolts and the bolt sleeves, thereby facilitating the production of the cast-in-place area of ​​the beam-column joint without the need for an extra supporting structure, and the operation is simple, thereby reducing the construction difficulty. In the present application, a lifting ring is also provided on the template in the stage of making the beam-column joint template, and in the stage of pouring concrete, a demolding hole is reserved on the floor slabs on each side of the beam-column joint, so that in the stage of removing the template, the template can be removed by passing a demolding tool through the demolding hole to loosen the bolts fixing the template, and the lifting rope passing through the demolding hole can lower the template to the ground below, so that in the stage of removing the template, there is no need for the staff to perform high-altitude operations, which greatly reduces the risk of high-altitude operations and the difficulty of construction operations, and improves the construction efficiency. The template can also be used multiple times, thereby improving the material turnover rate and reducing the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the process of the cast-in-place node construction method of the assembled building beam and column in the embodiment of the present application;

[0020] Figure 2 It is a structural schematic diagram of a beam-column node to which a template is fixed in an embodiment of the present application;

[0021] Figure 3 is a top view of a beam-column node to which a template is fixed in an embodiment of the present application;

[0022] Figure 4 It is a cross-sectional view of a beam-column node to which a template is fixed in an embodiment of the present application.

[0023] Figure numerals: 1, column; 101, column cap; 102, beam pad; 2, precast beam; 201, main beam; 202, secondary beam; 203, threaded sleeve; 3, formwork; 4, bolt; 5, floor slab; 6, demolding hole; 7, cast-in-place area of ​​beam-column joint. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0025] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0026] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms and should not be understood as indicating or implying relative importance. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0027] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0028] In order to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings.

[0029] like Figures 1 to 4 As shown, this embodiment is a method for constructing cast-in-place nodes of assembled building beams and columns, comprising the following steps:

[0030] S1. Construction preparation: make precast beam 2, and simultaneously construct cast-in-place column 1 on site. After the construction of precast beam 2 and column 1 is completed and reaches the designed strength, and all preparations are complete, use lifting equipment to hoist the precast beam 2 into place, so that the precast beam 2 is placed on the top of column 1, and bolt sleeves 203 are correspondingly provided on the left and right sides of the end of the precast beam 2 close to column 1;

[0031] S2. Make and install the beam-column node template: Make the template 3 according to the size of the node, precast beam 2 and column 1. The template is provided with threaded holes corresponding to the bolt sleeves 203. The bolts 4 pass through the threaded holes and are threadedly connected with the bolt sleeves 203 to fix the template 3 on the precast beam 2. Figure 2 , 3 As shown, a beam-column joint cast-in-place area 7 is formed between the template 3 and the top of the precast beam 2 and column 1, and a lifting ring is also provided on the template to facilitate the lowering of the components when the template is subsequently removed;

[0032] S3, pouring concrete: pouring the upper floor slab concrete and the beam-column joint and curing them to reach the strength. When laying the floor slab 5, a demolding hole 6 is reserved on each side of the floor slab near the beam-column joint. The lifting rope and the demolding tool can pass through the demolding hole 6 at the same time. The demolding tool can pass through the demolding hole 6 to separate the bolt 4 from the bolt sleeve 203;

[0033] S4. Removing the formwork: After the conditions for demolding are met, the lifting rope passes through the demolding hole reserved in advance on the upper floor slab and is fixedly connected to the lifting ring on the formwork 3. The demolding tool passes through the demolding hole to loosen the bolts fixing the formwork 3, and the formwork 3 is removed piece by piece. The formwork 3 is lowered to the ground below by the lifting rope. After the demolding of the beam-column node is completed, the holes in the floor slab and the bolt sleeves 203 are sealed.

[0034] In step S1, before making the precast beam 2, the beam-column node reinforcement is pre-arranged through BIM (Building Information Modeling) to avoid interference between the beam-column node reinforcement. In this embodiment, the top of the column 1 is provided with a column cap 101 and a beam pad 102, and the precast beam 2 is placed on the column cap or beam pad of the column 1. The single side of the precast beam 2 is provided with more than two bolt sleeves 203 arranged in the vertical direction. The precast beam 2 includes a main beam 201 and a secondary beam 202. Since the secondary beam 202 is generally provided with a beam pad, the elevations of the main and secondary beams at the same node are different, and the horizontal heights of the bolt sleeves 203 of adjacent precast beams are consistent, which not only ensures that the templates between the precast beams are reasonably stressed, but also facilitates the subsequent template fixation and increases the template turnover utilization rate.

[0035] In step S2, in combination with the relatively uniform specifications and dimensions of the prefabricated system components, in this embodiment, the template is a spliced ​​W-shaped standardized steel template with 90-degree angles at each corner of the template 3. The threaded holes are set on the outermost steel plate of the template 3, and the model of the bolt 4 is M14. Before installing the template 3, the template 3 needs to be cleaned and coated with a release agent for subsequent demoulding. Foam strips are pasted on the splicing part of the template 3 and the contact surface of the prefabricated beam to avoid leakage in subsequent steps.

[0036] In step S3, Figure 3 As shown, the demolding hole 6 is a through hole with a square cross-section, the vertical center line of the demolding hole 6 is parallel to the vertical center line of the end of the bolt sleeve, and the horizontal center line of the demolding hole 6 is parallel to the horizontal center line of the precast beam 2. In this embodiment, the distance between the demolding hole 6 and the template 3 is 150mm-250mm, and the length and width of the demolding hole 6 are 200mm×200mm.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A method for constructing cast-in-place nodes of assembled building beams and columns, characterized in that: The following steps are involved: S1. Construction preparation: make precast beams and construct cast-in-place columns simultaneously on site. After the construction of precast beams and columns is completed and reaches the designed strength, and all preparations are complete, the precast beams are hoisted into place and placed on the top of the columns. Bolt sleeves are correspondingly provided on the left and right sides of the end of the precast beam close to the column; S2. Make and install the beam-column node template: Make the template according to the size of the node, precast beam and column, and set the threaded holes corresponding to the bolt sleeves on the template. The bolts pass through the threaded holes and are threadedly connected with the bolt sleeves to fix the template on the precast beam. A beam-column node cast-in-place area is formed between the template and the top of the precast beam and column, and a lifting ring is set on the template; S3. Concrete pouring: pour the upper floor slab concrete and the beam-column joints and maintain them until they reach the required strength. When laying the floor slab, reserve a demolding hole on each side of the floor slab near the beam-column joint. The lifting rope and demolding tool can pass through the demolding hole at the same time. The demolding tool can pass through the demolding hole to separate the bolt from the bolt sleeve. S4, formwork removal: After the formwork removal conditions are met, the lifting rope passes through the formwork removal hole reserved in advance on the upper floor slab and is fixedly connected to the lifting ring on the formwork. The formwork removal tool passes through the formwork removal hole to loosen the bolts that fix the formwork. The formwork is removed piece by piece, and the formwork is lowered to the ground below by the lifting rope. After the formwork removal of the beam-column node is completed, the floor slab holes and bolt sleeves are sealed.

2. The method for constructing cast-in-place nodes of prefabricated building beams and columns according to claim 1, characterized in that: In step S1, before making the prefabricated beam, the steel bars of the beam-column nodes are pre-arranged through BIM.

3. The method for constructing cast-in-place nodes of prefabricated building beams and columns according to claim 1, characterized in that: In step S1, a column cap and a beam pad are provided at the top end of the column, and the prefabricated beam is placed on the column cap or the beam pad of the column.

4. The method for constructing cast-in-place joints of prefabricated building beams and columns according to claim 4, characterized in that: In step S1, two or more bolt sleeves arranged in the vertical direction are provided on one side of the precast beam, and the bolt sleeves of adjacent precast beams have the same horizontal height.

5. The method for constructing cast-in-place joints of prefabricated building beams and columns according to claim 4, characterized in that: In step S2, the template is a spliced ​​W-shaped standardized steel template with each corner angle of 90 degrees, the threaded holes are arranged on the outermost steel plate of the template, and the model of the bolts is M14.

6. The method for constructing cast-in-place joints of prefabricated building beams and columns according to claim 5, characterized in that: In step S2, before installing the template, the template needs to be cleaned and coated with a release agent, and a foam adhesive strip is pasted on the joint between the template and the contact surface of the prefabricated beam.

7. The method for constructing cast-in-place joints of prefabricated building beams and columns according to claim 6, characterized in that: In step S3, the demolding hole is a through hole with a square cross section, the vertical center line of the demolding hole is parallel to the vertical center line of the end of the bolt sleeve, and the horizontal center line of the demolding hole is parallel to the horizontal center line of the precast beam.

8. The method for constructing cast-in-place joints of prefabricated building beams and columns according to claim 71, characterized in that: The distance between the demoulding hole and the template is 150mm-250mm, and the length and width of the demoulding hole are 200mm×200mm.

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