Construction technology of prefabricated concrete structure beam-slab node and portable stirrup bender

Abstract

The invention discloses a construction process for a prefabricated concrete structure beam-slab node and a portable stirrup bender, the process comprising: prefabricating a steel bar skeleton with a loose upper opening of vertical stirrups, then tying the horizontal stirrups and the vertical main bars of the vertical component, hoisting the prefabricated steel bar skeleton to the site and extending its two ends into the vertical component respectively, hoisting the composite plate into place and inserting its upper spur bars into the steel bar skeleton, tying the upper horizontal longitudinal bars of the steel bar skeleton and the vertical stirrups, and finally bending and sealing the upper part of the vertical stirrups of the steel bar skeleton. The stirrup bender comprises a stirrup fixer that can be fixed on the steel bar skeleton and a stirrup bender that can be rotatably arranged on the stirrup fixer, the vertical stirrup bending piece on the stirrup bender is stopped on a side wall surface of the vertical stirrup on the steel bar skeleton facing away from the upper horizontal longitudinal bars, and the lower end of the vertical stirrup bending piece is higher than the set height of the upper horizontal longitudinal bars of the steel bar skeleton. The invention has high construction efficiency and high construction quality at the node.

Description

Technical Field

[0001] The invention relates to the field of prefabricated concrete structure construction, and in particular to a prefabricated concrete structure beam-slab node construction process and a portable stirrup bender. Background Art

[0002] In the existing prefabricated concrete structure construction, because the prefabricated components have been cast, the construction space of the beam-slab joint is relatively narrow compared to the traditional cast-in-place components, resulting in the installation of the composite beam composite layer reinforcement or the cast-in-place beam main reinforcement has always been a relatively labor-intensive construction section. However, the relevant prefabricated building construction specifications do not clearly indicate the construction sequence between the beam and slab prefabricated components and the on-site installation of reinforcement. In order to avoid unnecessary labor, each construction unit has different construction methods.

[0003] At present, the traditional construction technology has the following problems:

[0004] In the construction of composite floor slabs, take the construction sequence of cast-in-place beams and prefabricated truss reinforced concrete composite slabs (hereinafter referred to as composite slabs) as an example: if the cast-in-place beam reinforcement skeleton is tied first and then the composite slab is hoisted, the composite slab reinforcement will collide with the upper longitudinal reinforcement of the beam. When there are cast-in-place beams around the composite slab, the reinforcement of the composite slab must be bent and then bent again after the hoisting is completed. This practice seriously affects the construction quality of the beam-slab node and greatly affects the safety performance of the structure, which is very undesirable; if the composite slab is hoisted first and then the cast-in-place beam reinforcement skeleton is tied, the reinforcement of the composite slab and the horizontal stirrups of the vertical components will affect the construction space for beam reinforcement tying. The complex construction at the node increases the difficulty of personnel construction and there is unnecessary consumption of manpower.

[0005] The same situation applies to the steel bar binding of composite beams: if the steel bars of the cast-in-place layer of the composite beams are bound first and then the composite slabs are bound after the composite beams are hoisted, the same drawbacks as above will occur; if the composite slabs are hoisted first and then the steel bars of the composite layer of the beams are bound, the main bars on the upper part of the beams need to be inserted into the closed hoop of the prefabricated beams from the side, and the end hooks or other mechanical anchoring measures, as well as the steel bars of other components around them, will increase the difficulty of their installation. Therefore, there is a node method of combined closed vertical stirrups in the specification. However, according to Article 5.6.2 of GB / T 51231-2016 "Technical Standards for Prefabricated Concrete Buildings": "For composite frame beams with seismic resistance levels of one or two, the vertical stirrup densification area at the beam end should use integral closed vertical stirrups; when the composite beam is torsionally subjected, integral closed vertical stirrups should be used, and the overlapped part of the integral closed vertical stirrups should be set in the prefabricated part." It can be seen from the specifications that there are limitations on the use of combined closed stirrups for vertical stirrups in composite beams, which leads to the continued existence of the above-mentioned construction problems. Summary of the invention

[0006] In order to make up for the above deficiencies, the present invention provides a prefabricated concrete structure beam-slab node construction process and a portable stirrup bender. The prefabricated concrete structure beam-slab node construction process greatly improves the construction efficiency and the construction quality at the node.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a construction process for a prefabricated concrete structure beam-slab node, the specific steps are as follows:

[0008] Step 1: The steel skeleton is prefabricated. During prefabrication, the upper opening of the vertical stirrups of the steel skeleton is open and not closed. The steel skeleton forms open openings at one end of the vertical stirrups and at the other end of the vertical stirrups along its width direction. The two ends of the vertical stirrups have different heights, and the ends of the vertical stirrups are formed with inclined curved edges with matching inclination angles.

[0009] Step 2: Bind the horizontal stirrups of the vertical member with the vertical main reinforcement of the vertical member, wherein the vertical member is a column or a wall;

[0010] Step 3: Use a special hoist to lift the prefabricated steel skeleton in step 1 to the site for installation. The two ends of the horizontal longitudinal reinforcement at the bottom of the steel skeleton are respectively extended into the vertical components. The horizontal longitudinal reinforcement at the bottom of the steel stirrup can also be tied with the vertical components, but the tying is not subject to force and is used to prevent the horizontal longitudinal reinforcement from moving during the later pouring.

[0011] Step 4: Hoist the composite slab into place, and insert the reinforcement bars on the composite slab into the steel frame;

[0012] Step 5: Install the upper horizontal longitudinal reinforcement of the steel frame, and tie the upper horizontal longitudinal reinforcement of the steel frame with the vertical stirrups of the steel frame;

[0013] Step 6: Bend and close the upper ends of the vertical stirrups of the steel skeleton.

[0014] When closed, the higher end of the vertical stirrup is bent 90 degrees to the lower end, and the inclined bent edge of the higher end of the vertical stirrup is just opposite to the inclined bent edge of the lower end. A horizontal stirrup at the upper edge of the steel frame can be accommodated in the gap between the two inclined bent edges. Finally, concrete will be used to cast them into a whole. The reinforcing bars of the composite slab are fixed in the steel frame, and the horizontal longitudinal bars of the steel frame are fixed in the vertical components, finally forming a composite slab, steel frame and vertical components into one.

[0015] As a further improvement of the present invention, the steel skeleton is a cast-in-place beam or a composite beam. When the cast-in-place beam is prefabricated, the lower horizontal longitudinal reinforcement and the vertical stirrups of the steel skeleton structure are fixed by binding. When the composite beam is prefabricated, the lower horizontal longitudinal reinforcement and the vertical stirrups are fixed by pouring. This construction process can be used for cast-in-place beams as well as for stacked beams. It is only necessary to form a loose opening at the upper end of the vertical stirrups during prefabrication.

[0016] As a further improvement of the present invention, when the cast-in-place beam is prefabricated, temporary fixing bars are tied to the upper ends of the vertical stirrups to be bent and are arranged parallel to the lower longitudinal bars of the steel skeleton. After step five, the temporary fixing bars are first removed, and then the operation of step six is ​​performed. The upper ends of the vertical stirrups to be bent with a higher height are reinforced and positioned by temporary vertical stirrups to avoid interference between the vertical stirrups and the composite plates during the lifting and binding process of the composite plates. The vertical stirrups are connected by binding the temporary fixing bars, which facilitates the binding of the vertical stirrups and the horizontal longitudinal bars and the subsequent installation of the composite plates.

[0017] As a further improvement of the present invention, the temporary fixing rib is a φ6 steel bar. It can also be a steel bar of other diameters, as long as it plays a connecting role. The small diameter steel bar is selected as the temporary fixing rib, and it can be bent and other avoidance operations during the installation of the composite plate.

[0018] As a further improvement of the present invention, in the process of hoisting the composite board in place in step 4, the temporary fixing ribs are manually pulled to avoid the thrown ribs of the composite board. During the installation of the composite board, the temporary fixing ribs can be pulled to link the vertical stirrups to avoid the composite board, and at the same time, the temporary fixing ribs can be prevented from interfering with the thrown ribs of the composite board, thereby achieving avoidance.

[0019] A portable stirrup bender comprises a stirrup fixer and a stirrup bender, wherein the stirrup fixer can be fixedly positioned on a steel bar skeleton, the stirrup bender can be rotatable on the stirrup fixer around a rotating shaft parallel to the upper horizontal longitudinal bars of the steel bar skeleton, and a vertical stirrup bending piece is provided on the stirrup bender, wherein the vertical stirrup bending piece just stops on the side wall surface of the vertical stirrup on the steel bar skeleton facing away from the upper horizontal longitudinal bars, and the lower end of the vertical stirrup bending piece is higher than the set height of the upper horizontal longitudinal bars of the steel bar skeleton.

[0020] As a further improvement of the present invention, a bender handle and a fixer handle are respectively fixed on the stirrup bender and the stirrup fixer.

[0021] As a further improvement of the present invention, the stirrup bender is also fixed with an anti-slip sheet cross-set with the tight stirrup bending sheet, and a corner structure is formed between the anti-slip sheet and the vertical stirrup bending sheet for accommodating the vertical stirrups to be bent on the steel frame.

[0022] As a further improvement of the present invention, the stirrup fixer is provided with a horizontal longitudinal reinforcement fixing groove, which can be just mounted on the outer side of the upper horizontal longitudinal reinforcement of the steel frame. The stirrup fixer is also provided with a notch on the side wall facing away from the bending direction of the vertical stirrup. One side wall of the notch stops on the upper surface of the composite plate, and the other side wall of the notch stops on the side wall surface of the composite plate facing the steel frame.

[0023] As a further improvement of the present invention, the stirrup fixer is also provided with a vertical stirrup limiting plate, which stops at the surface of the vertical stirrup facing away from the upper horizontal longitudinal reinforcement of the steel frame, and there is a set gap between the upper end of the vertical stirrup limiting plate and the lower end of the vertical stirrup bending plate of the stirrup bender.

[0024] The beneficial technical effect of the present invention is as follows: the present invention first fixes the vertical stirrups and the lower horizontal longitudinal bars of the steel skeleton, so that the upper part of the vertical stirrups forms a loose structure, thereby avoiding the collision between the thrown bars of the composite plate and the upper horizontal longitudinal bars of the steel skeleton during the installation of the composite plate, and avoiding the bending and re-bending of the thrown bars during the installation of the composite plate. After the composite plate is installed in place, the vertical stirrups and the upper horizontal longitudinal bars are tied, and finally the upper ends of the vertical stirrups are bent to form a closed structure. This process allows the installation of cast-in-place component reinforcement and prefabricated components to be carried out from bottom to top, and the construction space is relatively sufficient, thereby speeding up the operation of the reinforcement project and reducing the consumption of reinforcement workers. It avoids the difficulty in tying beam reinforcement caused by the reduction of the operating space of construction personnel due to the thrown bars of the composite plate and the horizontal stirrups of the vertical structure, and avoids the deformation of the thrown bars of the composite beam and the composite plate due to collision, thereby speeding up the construction efficiency and enhancing the construction quality at the nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is the structural principle diagram of the steel skeleton of the cast-in-place beam;

[0026] Figure 2 Construction status diagram of installing composite slabs for cast-in-place beams;

[0027] Figure 3 This is the structural principle diagram of the reinforced steel skeleton of the composite beam;

[0028] Figure 4 Construction status diagram of installing composite slabs for composite beams;

[0029] Figure 5 This is the completed state diagram of the composite beam construction;

[0030] Figure 6 A perspective view of a stirrup fixer for a portable stirrup bender;

[0031] Figure 7 It is a front view of the stirrup fixer of the portable stirrup bender;

[0032] Figure 8 A three-dimensional diagram of a stirrup bender which is a portable stirrup bender;

[0033] Fig. 9 A front view of a stirrup bender which is a portable stirrup bender;

[0034] Fig.10 This is a diagram of the state before the vertical stirrups on the steel skeleton are bent using a portable stirrup bender;

[0035] Fig.11 This is a diagram of the state after the vertical stirrups on the steel skeleton are bent using a portable stirrup bender. DETAILED DESCRIPTION

[0036] Example:

[0037] Embodiment 1: A construction process for a prefabricated concrete structure beam-slab node, in a prefabricated building construction system when only a composite slab 5 is used in the prefabricated project:

[0038] Step 1: The cast-in-place beam is prefabricated by the reinforcement workers in the reinforcement processing shed to form a reinforcement skeleton. During prefabrication, the horizontal longitudinal reinforcement 4 at the lower part of the reinforcement skeleton of the cast-in-place beam is pre-tied with the vertical stirrup 1, the upper part of the vertical stirrup 1 is open, and the upper part of the vertical stirrup 1 is not bent and closed. A φ6 steel bar is tied to the upper part of the vertical stirrup 1 as a temporary fixing bar 7 of the reinforcement skeleton;

[0039] Step 2: Tie the horizontal stirrups 2 of the on-site vertical components to the main reinforcement of the vertical components;

[0040] Step 3: Use a special hoist to lift the prefabricated steel skeleton in step 1 to the site for installation. The lower horizontal longitudinal bars 4 of the steel skeleton are inserted into the vertical member. The two ends of the lower horizontal longitudinal bars 4 are respectively inserted into the vertical member. They can be tied at the intersection nodes with the vertical main bars 3 of the vertical member, or they can be not tied.

[0041] Step 5: Hoist the composite plate 5 into place. During the hoisting process, the temporary fixing ribs 7 are manually pulled to avoid the thrown ribs 18 of the composite plate 5, so that the thrown ribs 18 on the side wall of the composite plate 5 are inserted into the steel frame;

[0042] Step 6: Insert the upper horizontal longitudinal reinforcement 6 of the steel frame, and tie the upper horizontal longitudinal reinforcement 6 of the steel frame with the vertical stirrups 1 of the steel frame;

[0043] Step 7: Remove the temporary fixing rib 7;

[0044] Step 8: Bend and close the upper opening of the vertical stirrup 1 of the steel bar skeleton using a portable stirrup bender.

[0045] Embodiment 2: A construction process for a prefabricated concrete structure beam-slab node, when composite beams and composite slabs 5 are used in a prefabricated building construction system:

[0046] Step 1: The composite beam is prefabricated in a factory. During prefabrication, the upper opening of the vertical stirrup 1 of the composite beam is open, and the upper opening of the vertical stirrup 1 is not bent and closed;

[0047] Step 2: Tie the horizontal stirrups 2 of the on-site vertical components to the main reinforcement of the vertical components;

[0048] Step 3: Use a special hoist to lift the prefabricated composite beam in step 1 to the site for installation, and extend the lower horizontal longitudinal reinforcement 4 at both ends of the composite beam into the interior of the vertical member, and tie the lower horizontal longitudinal reinforcement 4 of the composite beam extending into the vertical member at the intersection node with the vertical main reinforcement 3 of the vertical member, or do not tie;

[0049] Step 5: Hoist the composite board 5 into place;

[0050] Step 6: insert the upper horizontal longitudinal reinforcement 6 of the composite beam, and tie the upper horizontal longitudinal reinforcement 6 of the composite beam with the vertical stirrup 1 of the composite beam;

[0051] Step 7: The upper open ends of the vertical stirrups 1 of the composite beam are bent and closed by a portable stirrup bender.

[0052] A portable stirrup bender used in Example 1 and Example 2 includes a stirrup fixer 8 and a stirrup bender 9, wherein the stirrup fixer 8 can be fixedly positioned on the steel skeleton, and the stirrup bender 9 can be rotatable around a rotating shaft 10 parallel to the upper horizontal longitudinal reinforcement of the steel skeleton and is arranged on the stirrup fixer 8, and the stirrup bender 9 is provided with a vertical stirrup bending piece 11, and the vertical stirrup bending piece 11 just stops the side wall surface of the vertical stirrup on the steel skeleton facing away from the upper horizontal longitudinal reinforcement, and the lower end of the vertical stirrup bending piece 11 is higher than the set height of the upper horizontal longitudinal reinforcement of the steel skeleton. When in use, it is only necessary to first fix the stirrup fixer 8 to the steel frame, so that the loose end of the vertical stirrup on the steel frame is close to the vertical stirrup bending piece 11 of the stirrup bender 9. After the stirrup bender 9 is rotated, the vertical stirrup is pressed and deformed by the vertical stirrup bending piece 11 to achieve the bending of the vertical stirrup. The high end of the vertical stirrup is bent 90 degrees to just face the low end of the vertical stirrup, and the two inclined bent edges are parallel and facing each other. Finally, the vertical stirrup forms a closed structure on the steel frame, and the thrown bars of the composite plate and the horizontal longitudinal bars of the steel frame are all enclosed in the vertical stirrups, and cement pouring can be carried out. The vertical stirrup bender has a simple structure, is convenient for bending each vertical stirrup, and is conducive to efficient construction.

[0053] The stirrup bender 9 and the stirrup fixer 8 are also respectively fixed with a bender handle 12 and a fixer handle 13. The stirrup bender 9 and the stirrup fixer 8 are operated by the handles, which is convenient to operate, and the long handles act as levers, so that the vertical stirrup bending can be easily achieved, which is labor-saving and efficient.

[0054] The stirrup bender 9 is also fixed with an anti-slip sheet 14 arranged crosswise with the tight stirrup bending sheet, and a corner structure is formed between the anti-slip sheet 14 and the vertical stirrup bending sheet 11 for accommodating the vertical stirrups to be bent on the steel skeleton. The anti-slip sheet 14 has a limiting and blocking effect on the side wall of the vertical stirrup, preventing it from sliding left and right during bending to affect the bending accuracy, and ensuring that the vertical stirrup is bent and just opposite to the opposite vertical stirrup to form a closed loop.

[0055] The stirrup fixer 8 is provided with a horizontal longitudinal reinforcement fixing groove 15, which can be just sleeved on the outer side of the upper horizontal longitudinal reinforcement of the steel frame. The stirrup fixer 8 is also provided with a notch 16 on one side wall facing away from the bending direction of the vertical stirrups. One side wall of the notch 16 stops on the upper surface of the composite plate, and the other side wall of the notch 16 stops on the side wall surface of the composite plate facing the steel frame. Through the vertical stirrup positioning groove, the stirrup fixer 8 uses the upper horizontal longitudinal reinforcement of the steel frame as the bending positioning reference to achieve accurate bending of the vertical stirrups.

[0056] The stirrup fixer 8 is also provided with a vertical stirrup stopper 17, which stops at the surface of the vertical stirrup on the side facing away from the horizontal longitudinal reinforcement of the upper part of the steel frame, and there is a set gap between the upper end of the vertical stirrup stopper 17 and the lower end of the vertical stirrup bending piece 11 of the stirrup bender 9. The vertical stirrup stopper 17 is tightly against the side wall of the part of the vertical stirrup that does not need to be bent, so as to prevent the part that does not need to be bent from being deformed due to force during the bending process.

Claims

1. A construction process for a prefabricated concrete structure beam-slab node, characterized by: The specific steps are as follows: Step 1: prefabricate the steel frame. During prefabrication, the upper opening of the vertical stirrups (1) of the steel frame is open and not closed; Step 2: Binding the horizontal stirrups (2) of the vertical member with the vertical main reinforcement (3) of the vertical member; Step 3: The prefabricated steel frame in step 1 is hoisted to the site for installation using a special hoist, and the two ends of the horizontal longitudinal reinforcement (4) at the bottom of the steel frame are respectively extended into the interior of the vertical component; Step 4: hoist the composite slab (5) into place, and insert the reinforcement bars on the composite slab into the reinforcement frame; Step 5: insert the upper horizontal longitudinal reinforcement (6) of the steel frame, and tie the upper horizontal longitudinal reinforcement of the steel frame with the vertical stirrups of the steel frame; Step 6: Bend and close the upper ends of the vertical stirrups of the steel skeleton.

2. The construction process of the assembled concrete structure beam-slab node according to claim 1 is characterized by: The steel frame is a cast-in-place beam or a composite beam. When the cast-in-place beam is prefabricated, the lower horizontal longitudinal reinforcement (4) of the steel frame structure is fixed to the vertical stirrups by binding. When the composite beam is prefabricated, the lower horizontal longitudinal reinforcement and the vertical stirrups are fixed by pouring.

3. The construction process for the assembled concrete structure beam-slab node according to claim 2 is characterized by: When the cast-in-place beam is prefabricated, temporary fixing bars (7) arranged parallel to the longitudinal bars at the bottom of the steel frame are tied to the upper end of the vertical stirrups to be bent. After step five is completed, the temporary fixing bars are first removed, and then step six is ​​performed.

4. The construction process for the assembled concrete structure beam-slab node according to claim 3 is characterized by: The temporary fixing reinforcement is φ6 steel bar.

5. The construction process for the assembled concrete structure beam-slab node according to claim 3 is characterized by: During the process of hoisting the composite board into place in step 4, the temporary fixing ribs are manually pulled to avoid the loose ribs (18) of the composite board.

6. A portable stirrup bender, characterized by: The invention comprises a stirrup fixer (8) and a stirrup bender (9), wherein the stirrup fixer can be fixedly positioned on a steel frame, and the stirrup bender can be arranged on the stirrup fixer and can rotate around a rotation axis (10) parallel to the upper horizontal longitudinal reinforcement of the steel frame, and the stirrup bender is provided with a vertical stirrup bending piece (11), and the vertical stirrup bending piece just stops at a side wall surface of the vertical stirrup on the steel frame facing away from the upper horizontal longitudinal reinforcement, and the lower end of the vertical stirrup bending piece is higher than the set height of the upper horizontal longitudinal reinforcement of the steel frame.

7. The portable stirrup bender according to claim 6 is characterized in that a bender handle (12) and a fixer handle (13) are fixedly provided on the stirrup bender and the stirrup fixer respectively.

8. The portable stirrup bender according to claim 6 is characterized in that: an anti-slip sheet (14) cross-set with the tight stirrup bending sheet is fixedly provided on the stirrup bender, and a corner structure is formed between the anti-slip sheet and the vertical stirrup bending sheet for accommodating the vertical stirrups to be bent on the steel frame.

9. The portable stirrup bender according to claim 6 is characterized by: The stirrup fixer is provided with a horizontal longitudinal reinforcement fixing groove (15), which can be sleeved on the outer side of the upper horizontal longitudinal reinforcement of the steel bar skeleton. The stirrup fixer is also provided with a notch (16) on one side wall facing away from the bending direction of the vertical stirrup. One side wall of the notch stops on the upper surface of the composite plate, and the other side wall of the notch stops on the side wall surface of the composite plate facing the steel bar skeleton.

10. The portable stirrup bender according to claim 6, characterized in that: The stirrup fixer is also provided with a vertical stirrup limiting piece (17), which stops at the surface of the vertical stirrup facing away from the upper horizontal longitudinal reinforcement of the steel bar skeleton, and a set gap exists between the upper end of the vertical stirrup limiting piece and the lower end of the vertical stirrup bending piece of the stirrup bender.

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