Construction method for manufacturing and connecting fabricated concrete members

Abstract

The invention provides a construction method for manufacturing and connecting fabricated concrete members, which comprises the following steps of: at the joint of a foundation member and a newly-added member, adopting reinforcing measures for steel bar connection, adopting welding connection, and adopting grouting material filling connection for concrete. The method has the advantages of shortening the construction period, saving the construction cost and improving the connection strength of the prefabricated parts.

Description

Technical Field

[0001] The invention belongs to the field of construction, and in particular relates to a construction method for manufacturing and connecting assembled concrete components. Background Art

[0002] my country is currently vigorously promoting prefabricated construction technology in the field of residential construction. Prefabricated construction refers to the transfer of a large number of on-site operations in traditional construction methods to factories, where building components and accessories (such as floor slabs, wall panels, stairs, balconies, etc.) are processed and manufactured in factories, transported to construction sites, and assembled and installed on site through reliable connection methods. Prefabricated buildings have the advantages of shortening construction period, quality assurance, energy saving and environmental protection, but they also have disadvantages such as high cost, relatively weak seismic performance, and important load-bearing parts such as beams and columns still need to be cast on site.

[0003] The present invention proposes a more reliable construction method for connecting prefabricated concrete components: in the prefabrication process of the component factory, the method for the basic component is to increase the density of L-shaped steel bars at the connection end, and then weld the ends of the longitudinal bars and the increased bars uniformly to a steel section (or steel frame) perpendicular to the steel bars, and one side of the steel section is exposed for welding the steel bars of the newly added component; the method for adding new components is to increase the density of L-shaped steel bars (or new steel frames) at the connection end, and then expose the heads of the steel bars to be welded at the connection, and open a groove between the steel bar heads and the outside of the concrete at the connection. When connecting at the construction site, first use a crane to hoist the new component above the basic component, and fix and unhook it after the position adjustment is determined. Then, at the groove on the outside of the new component, weld the steel bar heads (or steel frames) of the new component to the steel section (or steel frame) of the basic component, and then use a template to cover the two sides of the connection, and finally fill the internal space of the template with cement-based grouting material.

[0004] Compared with the current prefabricated method, this construction plan, firstly, takes reinforcement measures in the connection area and densifies and strengthens the steel bars, so that the tensile and bending forces that the pure steel structure can withstand here reach or exceed the original reinforced concrete parent material, and the connection strength after grouting and hardening is further improved; secondly, by adopting welding, all the steel bars inside the concrete are effectively connected, avoiding the uncertainty of connection quality caused by various on-site construction factors in the current sleeve grouting method; thirdly, all components can be prefabricated and then transported to the site for standardized assembly. During construction, only a small amount of grouting construction is retained at the joints, reducing the current large amount of cast-in-place wet operations in the prefabricated type, which can greatly save construction time and construction costs.

[0005] It can be seen that the prefabrication and construction scheme of the present invention can enhance the overall seismic strength of the building structure, so that the assembly rate of prefabricated buildings can be greatly improved, and the restriction that the building height shall not exceed 100m is lifted. Summary of the invention

[0006] The purpose of the present invention is to provide a construction method for connecting prefabricated concrete components, which has the advantages of saving construction costs and improving the connection strength of prefabricated components. At the same time, a manufacturing and construction method for connecting a basic component with an additional component is provided. At the connection between the basic component and the additional component, the steel bars are connected by welding, and the concrete is connected by simultaneous grouting.

[0007] To achieve the above purpose, the basic component is to add reinforcing ribs or steel frames at the connection ends, and weld all the steel bar heads at the connection ends to a steel section (or the inner edge of the steel frame) that is perpendicular to the steel bars. One side of the steel section (or the outer edge of the steel frame) is exposed for welding the steel bars of the newly added components.

[0008] In order to achieve the above purpose, the newly added components are to add reinforcing ribs or steel frames at the connection ends (if a steel frame is used, all steel bar heads are welded to the inner edge of the steel frame), the steel bar heads (or steel frame edges) that need to be welded are exposed and set with welding grooves, and a groove is opened on the outside of the concrete at the joint.

[0009] To achieve the above purpose, the number, length and diameter of the reinforcing ribs (or the thickness and height of the steel frame) are determined according to the force calculation. Under the condition that the force allows, it is preferred to set the reinforcing ribs and use flat steel connections.

[0010] To achieve the above-mentioned purpose, if the connection is a vertical connection, the foundation component can have one or more grooves reserved on the concrete surface of the side facing upward, and the newly added component can have one or more raised concrete pre-set accordingly, which can be used as temporary support for mortise and tenon joints during construction; if it is a horizontal connection, the newly added component needs to be lifted by a supporting machinery at the bottom during construction.

[0011] To achieve the above purpose, the construction method is as follows: after the construction site is hoisted into place, the on-site workers guide the newly added components to adjust their positions, slowly drop the newly added components toward the foundation components, and fix and unhook them after the positions are determined.

[0012] To achieve the above purpose, the construction method is: after unhooking, the construction personnel weld all the exposed steel bar heads (or steel frame outer edge) of the new component to the steel section (or steel frame outer edge) of the basic component at the groove on the outside of the new component, and preferably use high-quality and high-speed welding processes such as laser welding.

[0013] To achieve the above purpose, the construction method is: after welding is completed, the two sides of the joint are wrapped with a template, and then all the gaps in the connection gap are filled tightly with grouting material. The grouting material can be poured in by opening a hole on one side of the concrete or directly opening a hole on the outside of the steel frame.

[0014] The present invention solves two key pain points of current prefabricated buildings. First, the overall structural strength of the building is not high, which limits the assembly rate, seismic performance and building height of the building. Second, a large amount of wet work is still required on the construction site, which is difficult and costly, and takes a long construction period. The present invention has obvious advantages in these two aspects. The overall strength of the prefabricated building constructed by the present invention can be higher than that of the traditional construction method of on-site casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the elevation and section layout drawing of the vertical connection of prefabricated shear wall components.

[0016] Figure 2 It is the plan and elevation layout drawing of the vertical connection of prefabricated column components.

[0017] Figure 3 Plan and elevation layout of the transverse connection between precast beams and precast columns Figure 4 Elevation section layout drawing of transverse connection between precast panels and precast beams DETAILED DESCRIPTION

[0018] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0019] See also Figure 1 As shown, it shows the elevation and section layout of the vertical connection of the prefabricated shear wall components, the vertical steel bars 4 and the reinforcing bars 10 of the basic component 1 are uniformly welded to the flat steel 7, and a groove 9 is set on the top of the concrete body; the vertical steel bars 5 and the reinforcing bars of the newly added component 2 are set with a groove 6 at the joint, and a groove 3 is opened on the outer side of the concrete at the connection, and two concrete protrusions 8 are set at the bottom; the number, length and diameter of the reinforcing bars are determined according to the force calculation, and the assembly construction sequence is as described in the previous invention.

[0020] See also Figure 2As shown, it shows the plan and elevation layout of the vertical connection of the prefabricated column components. The right figure shows the elevation section of the left plan at the axis 13: the vertical steel bars 3 of the foundation component 1 are uniformly welded to the steel frame 5, and a groove 11 is set on the top of the concrete body, and a grouting channel 9 is opened at the bottom of the steel frame; the vertical steel bars 4 of the newly added component 2 are uniformly welded to the steel frame 6, a groove 7 is set on the exposed outer edge of the steel frame 6, and a groove 8 is opened on the outer side of the concrete at the connection, a concrete protrusion 12 is set at the bottom, and a grouting channel 10 is opened on the upper part of the steel frame; the thickness and height of the steel frame are determined according to the force calculation. Under the condition that the force allows, it can be used Figure 1 Reinforcement ribs are set and flat steel connections are used instead of steel frames, and the assembly construction sequence is the same as described in the previous invention.

[0021] See also Figure 3 As shown, it shows the plan and vertical section layout of the transverse connection between the precast beam and the precast column. The right side figure shows the vertical section of the left side plan at the axis 11: stirrups 4 and steel frames 5 are added in the foundation component 1, and the steel bar heads of the stirrups 4 are welded to the inner edge of the steel frame 5. The steel frame 5 is provided with openings in the concrete to pass the vertical bars 3, and the outer edge of the steel frame 5 extends to the connection surface; the steel bar heads of the through-length bars 8 of the newly added component 2 are welded to the steel frame 6, the outer edge of the steel frame 6 is exposed and a welding groove is provided, a groove 7 is opened on the outer side of the concrete at the connection, and grouting channels 9 and 10 are opened at the rear end of the steel frame; the thickness and height of the steel frame are determined according to the force calculation. Under the condition that the force allows, it can be used Figure 1 Reinforcement ribs are set and flat steel connections are used instead of steel frames, and the assembly construction sequence is the same as described in the previous invention.

[0022] See also Figure 4 As shown, it shows the vertical section layout diagram of the transverse connection between the precast plate and the precast beam, the beam as the basic component 1 includes through-length reinforcement 3, structural reinforcement 4, stirrups 5 and transverse reinforcement 7 for connection, wherein the transverse reinforcement 7 is uniformly welded to the flat steel 6, and one side of the flat steel 6 is exposed to serve as a welding base; the floor slab 2 as a newly added component includes surface reinforcement and bottom reinforcement 8, truss reinforcement 10, and reinforcing bars are added at the connecting end, which are exposed together with the steel bar head containing the surface reinforcement and bottom reinforcement 8 and a welding groove is set, and grooves are opened on both sides of the concrete at the connecting end; wherein the number, length and diameter of the reinforcing bars are determined according to the force calculation, and the assembly construction sequence is as described in the previous invention.

[0023] Example 1: Prefabricated office building Building parameters: frame structure, building height 90m, floor height 3.8m, 20 floors in total Cast-in-place part: foundation, basement Assembly part: first floor and above floors, roof and flower racks Types of prefabricated components: columns, beams, floor slabs, interior and exterior walls, steps Structural description: The concrete size and self-weight of the foundation structure and basement structure are large, and prefabrication and on-site assembly are not economical, so full cast-in-place construction is adopted. All other components on the first floor and above can be constructed by prefabrication and assembly, with an overall assembly rate of 95%.

[0024] Example 2: Prefabricated high-rise residential building Building parameters: Shear wall structure, building height 160m, floor height 3.0m, 46 floors in total Cast-in-place part: foundation, basement, first floor non-standard layer Assembly part: second floor and above, roof and flower stand Types of prefabricated components: columns (including edge components), beams, floor slabs, interior and exterior walls, steps, balconies, and air-conditioning panels.

[0025] Structural description: The concrete size and self-weight of the foundation structure and basement structure are large, and prefabrication and on-site assembly are not economical, so full cast-in-place construction is adopted. There are many types of non-standard components on the first floor, and the component sizes are inconsistent with those of the standard floors. It is not economical to prefabricate them separately, so full cast-in-place construction is also adopted. All other components on the second floor and above can be constructed by prefabrication and assembly, with an overall assembly rate of 90%.

[0026] At present, prefabricated floor slabs are generally constructed by composite slabs, and there are still a lot of formwork cast-in-place operations on beams, columns and surfaces, and the bonding strength is not high. If the invented method is used for prefabrication and on-site assembly, most of the on-site wet operations and formwork installation can be omitted, saving costs and engineering time. In addition, the quality reliability of factory-prefabricated floor slabs is better, and lightweight concrete can be used as the main material of the floor slabs, which has advantages in structural lightening and earthquake resistance.

[0027] The above description has fully disclosed the specific implementation of the present invention. It should be pointed out that any changes made by those skilled in the art to the specific implementation of the present invention do not deviate from the scope of the claims of the present invention.

[0028] Accordingly, the scope of the claims of the present invention is not limited to the aforementioned specific embodiments.

Claims

1. A construction method for manufacturing and connecting assembled concrete components, characterized in that: Provide a method for making and connecting foundation components and newly added components. At the connection between the foundation components and the newly added components, the steel bars are connected by welding, and the concrete is connected by beveling the connection between the newly added components and filling grouting material at the same time.

2. The basic component according to claim 1, characterized in that: Measures are taken to strengthen the steel structure at the connection end by adding reinforcing ribs or steel frames, and all the steel bar heads at the connection end are welded to a steel section (or the inner edge of the steel frame) that is perpendicular to the steel bars. One side of the steel section (or the outer edge of the steel frame) is exposed for welding the steel bars of the newly added components.

3. The new component according to claim 1, characterized in that: Measures are taken to strengthen the steel structure at the connection end, such as adding reinforcing ribs or steel frames (if a steel frame is used, all steel bar heads are welded to the inner edge of the steel frame). The steel bar heads (or the outer edge of the steel frame) that need to be welded are exposed and a welding groove is set, and a groove is opened on the outside of the concrete at the joint.

4. The steel structure strengthening measures according to claim 2 and claim 3 are characterized in that: The number, length and diameter of the reinforcing ribs (or the thickness and height of the steel frame) are determined according to the force calculation. Under the condition that the force allows, it is preferred to set the reinforcing ribs and use flat steel welding connection.

5. The connection according to claim 1, characterized in that: If it is a vertical connection, one or more grooves can be reserved on the concrete surface of the upward butt joint of the foundation component, and one or more raised concretes can be pre-placed on the newly added component to serve as temporary support for the mortise and tenon joints during construction; If it is a horizontal connection, the newly added components need to be lifted up from the bottom by supporting machinery during construction.

6. The construction method according to claim 1, characterized in that: After hoisting into place at the construction site, on-site workers guide the newly added components to adjust their position, slowly drop the newly added components close to the foundation components, fix and unhook them after the position is determined; after unhooking, construction workers weld all the exposed steel bar heads (or steel frame outer edge) of the newly added components to the steel sections (or steel frame outer edge) of the foundation components at the groove on the outside of the newly added components, and prefer high-quality and high-speed welding processes such as laser welding; after welding is completed, use a template to wrap both sides of the joint, and then use grouting material to fill all gaps in the connection gap tightly.

7. The welding method according to claim 6, characterized in that: A welding process with high quality and high speed is preferred.

8. The grouting material filling as claimed in claim 6, characterized in that: The grouting material can be poured in by drilling holes on one side of the concrete or directly drilling holes on the outside of the steel frame.

Images