Construction method for guaranteeing construction quality of core area of PC beam column of super-large structure

Abstract

The invention provides a construction method for guaranteeing the construction quality of a core area of a PC beam column of a super-large structure, and relates to the technical field of PC beam column construction, which comprises the following steps: replacing anchoring hooks at the end parts of longitudinal load-bearing steel bars at the upper and lower parts of a PC beam with steel anchor plates; during component production, connecting bolts are pre-buried in the connecting positions of the PC beam columns in advance; the PC column is hoisted to the designed axis position, and the strength of the PC column grouting material meets the design requirement; a core area stirrup is placed on a PC column head in advance before the PC beam is hoisted; the super-large-span PC beams are hoisted to the corresponding axis positions, and the PC beam columns are connected and fixed through steel corner connectors; the stirrups in the core area of the PC column with PC beams in both directions are bound in time according to the beam hoisting sequence, and the binding number and spacing of the stirrups in the core area are ensured; steel bar positioning hoops are welded in the core area of the PC beam column, and meanwhile positioning steel plates are arranged on the upper portions of reserved column vertical steel bars of the PC column; and the PC beam column core area adopts a mode of combining a mirror surface black mold, a batten and a square steel tube. The working efficiency can be improved, and the construction period can be shortened.

Description

Technical Field

[0001] The invention relates to the technical field of PC beam-column construction, and in particular to a construction method for ensuring the construction quality of a core area of ​​a super-large structure PC beam-column. Background Art

[0002] With the acceleration of the national greening, urbanization and industrialization process, the original extensive development mode of the construction industry no longer meets the market demand. Therefore, the market advantages and potential of building industrialization and full-chain industrial modernization are becoming increasingly prominent. The industrialization of building components integrates design, production, transportation and installation through design standardization, component componentization, construction mechanization and management informatization, which improves the efficiency and quality of engineering construction, improves labor productivity and the overall quality level of engineering construction, and significantly shortens the construction period. With the vigorous development of prefabricated buildings and the promotion of local governments and marketization, more and more large-space prefabricated frame structure buildings are being applied. For large-space prefabricated structures, super-large span PC beams and super-large size and super-high height PC columns are required. At the same time, the construction quality of the core area of ​​PC beams and columns of super-large structures is also a major problem that needs to be solved during the construction process.

[0003] At present, the construction quality control of the core area of ​​super-large structure PC beam and column components has become a key technology for prefabricated structures. In the past, the quality of steel bar production and installation and concrete pouring in the core area of ​​conventional PC beams and columns was poor, and the vertical force-bearing steel bars in the core area of ​​PC beams and columns were often offset and lacked stirrups, and the concrete vibration was not dense and looked poor. Due to the small operating space, it was inconvenient for workers to operate, and the core area steel bars were dense and the concrete was difficult to vibrate, which restricted the construction progress and the construction quality of the core area of ​​PC beams and columns. In order to ensure the safe, fast and efficient construction of the project, the inventor has continuously studied and summarized to form a construction method for ensuring the construction quality of the core area of ​​super-large structure PC beams and columns. Summary of the invention

[0004] In view of the above-mentioned prior art, the present invention proposes a construction method for ensuring the construction quality of the core area of ​​super-large structure PC beams and columns.

[0005] The present invention provides a construction method for ensuring the construction quality of the core area of ​​a super-large structure PC beam column, comprising the following steps: Step 1: Replace the anchor hooks at the ends of the longitudinal stress-bearing steel bars at the upper and lower parts of the PC beam with steel anchor plates; Step 2: When producing components, pre-embed the connecting bolts at the connection between PC beams and columns; Step 3: Hoist the super-sized and super-high PC columns to the designed axis position, so that the strength of the PC column grouting material meets the design requirements; Step 4: Place core area stirrups on the PC column head in advance before hoisting the PC beam; Step 5: Hoist the super-large span PC beam to the corresponding axis position, and connect and fix the PC beam column with steel angle code; Step 6: For PC columns with PC beams in both directions, the core area stirrups are tied in time with the beam hoisting sequence to ensure the number and spacing of the core area stirrups; Step 7: Weld steel bar positioning hoops in the core area of ​​the PC beam column, and set positioning steel plates on the upper part of the reserved vertical steel bars of the PC column; Step 8: The core area of ​​the PC beams and columns uses a combination of mirrored black mold + wooden squares and square steel pipes to improve the strength of the formwork and reinforcement system.

[0006] Preferably, the steel bar positioning hoop is HRB400φ25.

[0007] Preferably, the steel angle bracket and the positioning steel plate are both made of Q235B steel, with wall thicknesses of 8 mm and 10 mm respectively.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention proposes a construction method for ensuring the construction quality of the core area of ​​the PC beam column of a super-large structure, which can ensure the construction quality of the steel bar engineering and concrete engineering in the core area of ​​the PC beam column of a super-large structure, improve work efficiency, and shorten the construction period. At the same time, it reduces the construction period and cost losses caused by rework, ensures the safety and stability of the core area of ​​the PC structure, saves the construction period of the PC structure, and brings certain economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 , 2 It is a construction schematic diagram of a construction method for ensuring the construction quality of the core area of ​​a super-large structure PC beam column in an embodiment of the present invention.

[0010] Among them, 1. Connecting bolts; 2. Steel angle codes; 3. Load-bearing steel bars; 4. Steel anchor plates; 5. Column vertical steel bars; 6. Steel bar positioning hoops; 7. Positioning steel plates. DETAILED DESCRIPTION

[0011] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments.

[0012] Embodiment: A construction method for ensuring the construction quality of the core area of ​​a super-large structure PC beam column, such as Figure 1-Figure 2 As shown, the following steps are included: Step 1: In the in-depth design of the PC beam, considering that the large specifications and large number of steel bars in the core area of ​​the PC beam column will affect the quality of concrete pouring in the core area, the anchor hooks at the ends of the longitudinal force-bearing steel bars 3 in the upper and lower parts of the PC beam are replaced with steel anchor plates 4 to reduce the space occupied by the steel bars in the core area and improve the quality of concrete pouring; when producing the components, the steel anchor plates 4 and the ends of the force-bearing steel bars 3 are pre-threaded with a threading machine and then screwed with protective caps to prevent the thread teeth from being damaged during the production and hoisting process, affecting the connection of the steel anchor plates 4; Step 2: When deepening the PC component, set 2 M10 connecting bolts at 150mm at the end of the intersection of the PC beam and column, which are used for fixing the frame after the subsequent lifting is completed. When the component is produced, pre-embed the connecting bolts 1 at the connection of the PC beam and column; Step 3: Use a tower crane to hoist the super-sized and super-high PC column to the designed axis position. After hoisting, adjust the verticality of the column body. When the verticality of the column meets the specification requirements, perform grouting operations to ensure that the strength of the PC column grouting material meets the design requirements; Step 4: Place two stirrups in the core area of ​​the PC column head before hoisting the PC beam to prevent the failure to place the two stirrups at the bottom after the PC beam is hoisted into place, resulting in a large spacing between the stirrups at the bottom, causing concrete cracking and stress on the structural components in the later stage; Step 5: When the grouting strength of the PC column reaches the design strength, use a tower crane to hoist the super-large span PC beam to the corresponding axis position, and connect and fix the PC beam column with 8mm thick steel angle code 2 and connecting bolts 1 to prevent relative deviation due to construction; the steel angle code 2 is made of Q235B steel; Step 6: For PC columns with PC beams in both directions, the core area stirrups are tied in time with the beam hoisting sequence to ensure the number and spacing of the core area stirrups; Step 7: Weld a steel bar positioning hoop 6 at 1 / 3 of the height of the core area of ​​the PC beam column. The steel bar positioning hoop 6 adopts HRB400φ25. At the same time, set a 10mm thick positioning steel plate 7 at 0.5m above the column vertical reinforcement 5 reserved in the PC column. The positioning steel plate 7 adopts Q235B steel to ensure that the column vertical reinforcement does not deviate during concrete pouring; Step 8: The core area of ​​the PC beam and column uses a combination of 18mm thick mirror black mold + wooden squares and square steel pipes to improve the strength of the formwork and reinforcement system. When pouring concrete, a smaller diameter inserted vibrator is used for vibrating. The small vibrator model is ZN35. The management personnel supervise the vibration operation throughout the process to ensure that the concrete is vibrated and compacted with good quality.

[0013] The above are only implementation modes of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent schemes made using the contents of the present invention specification, directly or indirectly applied in other related technical fields, are also within the patent protection scope of the present invention.

Claims

1. A construction method for ensuring the construction quality of the core area of ​​super-large structure PC beams and columns, characterized in that: The steps include: Step 1: Replace the anchor hooks at the ends of the longitudinal stress-bearing steel bars at the upper and lower parts of the PC beam with steel anchor plates; Step 2: When producing components, pre-embed the connecting bolts at the connection between PC beams and columns; Step 3: Hoist the super-sized and super-high PC columns to the designed axis position, so that the strength of the PC column grouting material meets the design requirements; Step 4: Place core area stirrups on the PC column head in advance before hoisting the PC beam; Step 5: Hoist the super-large span PC beam to the corresponding axis position, and connect and fix the PC beam column with steel angle code; Step 6: For PC columns with PC beams in both directions, the core area stirrups are tied in time with the beam hoisting sequence to ensure the number and spacing of the core area stirrups; Step 7: Weld steel bar positioning hoops in the core area of ​​the PC beam column, and set positioning steel plates on the upper part of the reserved vertical steel bars of the PC column; Step 8: The core area of ​​the PC beams and columns uses a combination of mirrored black mold + wooden squares and square steel pipes to improve the strength of the formwork and reinforcement system.

2. The construction method for ensuring the construction quality of the core area of ​​the super-large structure PC beam column according to claim 1 is characterized in that: The steel bar positioning hoop adopts HRB400φ25.

3. The construction method for ensuring the construction quality of the core area of ​​the super-large structure PC beam column according to claim 1 or 2, characterized in that: The steel angle brackets and positioning steel plates are both made of Q235B steel, with wall thicknesses of 8 mm and 10 mm respectively.

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