CN-122014009-A - Construction method for transforming main beams of secondary beams in reinforcement engineering

CN122014009ACN 122014009 ACN122014009 ACN 122014009ACN-122014009-A

Abstract

The invention discloses a construction method for converting a primary beam into a main beam in reinforcement engineering, which comprises the steps of expanding a space through reconstruction of an old building, converting the primary beam into the main beam, namely a reinforced beam, dismantling three middle columns below the reinforced beam, expanding bearing column bearing surfaces at two ends of the beam, dismantling relevant loads according to ①, supporting ② before reinforced beam construction, cutting a middle column head according to ③, dismantling primary house structural plates at two sides of ④, dismantling the primary roof structural plates from the primary beam to a reinforced beam area, erecting a system for installing and supporting a bottom die of the ⑤ beam, a side die of the beam and a template of the upturned portion of the beam, connecting steel bars of the ⑥ reinforced beam, concreting and curing a lower hanging portion of the ⑦ beam and an upturned portion of the beam, dismantling ⑧ templates, and dismantling the templates after the concrete strength reaches 100%. The invention realizes safe, quick and economic structural transformation through a modularized steel support system, a staged pouring and a precise column cutting process.

Inventors

Zulinigail Maimai Ti
Maiwu Maijiang Ma
CHEN ZHISHANG
HU YUN
Yue Xinhui
LI HONGWEI
BAI JING
ZHANG CHENZHI

Assignees

中建新疆建工集团第一建筑工程有限公司

Dates

Publication Date: 20260512
Application Date: 20251114

Claims (8)

1. A construction method for a secondary beam conversion girder in reinforced engineering is characterized in that an old building is transformed into an enlarged space, the cross section of a primary secondary beam (1) is enlarged according to structural load calculation, the primary secondary beam (1) is converted into a main beam which is also called a reinforced beam (2), three intermediate beams (3) positioned below the reinforced beam are removed, bearing column carrying surfaces positioned at two ends of the beam are enlarged, the construction method is as follows, ① is used for removing relevant loads, the reinforced beam (2) is used as a roof beam, construction layers of the relevant roof are required to be removed, the roof is unloaded and cleared, ② the reinforced beam (2) is supported before construction, supporting steel columns are respectively arranged below the primary main beams (4) positioned at the front side, the rear side and the left side of each intermediate beam (3), or cantilever beams (5) are arranged at the front end of the primary main beam (4), oblique supporting steel columns (6) are arranged below the cantilever beams (5), ③ is used for cutting column heads of the intermediate beams (3), cutting is carried out according to the height of the designed positions of the cut intermediate columns (3), the two sides of the reinforced beam (2) are used as roof beams, a support plate is used for removing the primary roof beam (2), the primary plate is used for removing the structural plate of the two sides of the reinforced roof beam, the primary beam (1) is partially connected to a formwork is removed, and a formwork is partially turned over, a concrete template is removed, a support structure is formed and a support structure is removed, and a support is formed, and a support is attached to a support mode for a bridge is attached to a support, and a support mode is attached to a bridge, and a support mode.
2. The construction method of the reinforced engineering secondary beam conversion main beam according to claim 1, wherein the section of the primary beam (1) is 300 x 600mm, and the section of the reinforced beam (2) is 800 x 200mm.
3. The construction method of the reinforced engineering secondary beam conversion main beam according to claim 1, wherein the cross section of the original bearing columns at the two ends of the beam is 500 x 400mm, and the cross section of the enlarged rear bearing column (7) is 1000 x 900mm.
4. The construction method for the secondary beam conversion main beam in reinforcement engineering according to claim 1, wherein a first supporting steel column (8) is arranged below the primary main beam (4) and is composed of 300 x 300H-shaped steel, a second supporting steel column (9) is arranged below the primary secondary beam (1) and is composed of 200 x 200H-shaped steel, an inclined supporting steel column (6) is arranged below the cantilever beam (5) and is composed of 20# I-shaped steel, U-shaped brackets (10) arranged at the top ends of the first supporting steel column (8) and the second supporting steel column (9) are respectively matched with the corresponding primary beam (4) and the primary secondary beam (1) and are fixed by expansion bolts, a jack (13) is arranged between a surrounding column bracket (11) arranged at the lower end of the first supporting steel column (8) and the second supporting steel column (9) and a cushion steel plate (12) fixedly connected to a bottom plate of a primary building in a matched mode, a steel wedge (14) is arranged between the lower end of the cantilever column and the cushion steel plate (12) after the supporting is completed, the wedge steel plate (14) is arranged at the top ends of the wedge steel plate (6) and is fixedly connected with the corresponding steel bracket (6) through the expansion bolts (15) and the expansion bolts (3) are fixedly connected to the middle supporting steel column (6).
5. The construction method for the conversion main beam of the reinforced engineering secondary beam, as set forth in claim 1, is characterized in that the step of cutting the middle column head is to mark the original middle column (3) from the bottom of the original secondary beam (1) to the bottom of the reinforced beam (2) to the position of the bottom of the reinforced beam (105 mm), cutting is carried out at the marked position, and the part of the cut original middle column head connected with the original secondary beam (1) is wrapped in the reinforced beam (2).
6. The construction method for the conversion main beam of the secondary beam of the reinforcement engineering according to claim 1, which is characterized in that a beam bottom die is erected, slurry is seated on a base plate of an original structure corresponding to the reinforcement beam (2), before grouting materials are finally set, 16# I-steel (16) is paved at a distance of 450mm in the span direction of the reinforcement beam (2), phi 32mm reinforcing steel bars are uniformly welded on the 16# I-steel (16), a vertical rod sleeve at the lower end of a vertical rod (17) is sleeved outside the vertical rod (17), an adjustable support bracket (20) is arranged at the top end of the vertical rod (17), a sweeping rod is arranged at the lower part of the vertical rod (17) at the same time, a wood base plate is arranged at the bottom of each vertical rod bracket at the two sides of the beam bottom, a base (19) is arranged at the bottom of each vertical rod (18), and an adjustable support bracket (20) is arranged at the top; the beam side mould is installed, the beam side mould (21) adopts a 15mm thick cladding wood gluing mould, the beam side mould is provided with a counter-pulling screw (22) and is reinforced by double steel pipes, the inner edge of the lower hanging beam side mould is 6 pairs of 40 x 70mm square timber, the outer edge is phi 48.3 x 3.6mm double steel pipes, the distance is 450mm, a phi 14 counter-pulling screw (22) is added between the outer edges at two sides of the beam bottom mould (21) to reinforce, the junction of the beam plates is reinforced by a phi 48 x 2.8mm steel pipe (23) 45-degree diagonal bracing beam side mould (21), the beam upturned part mould is erected, after the concrete strength of the lower hanging beam reaches 100%, the mould adopts a 15mm thick cladding wood gluing mould, the beam side mould is provided with a counter-pulling screw (22) and is reinforced by double steel pipes, the upper turning beam side mould inner edge is 6 pairs of 40 x 70 square timber, the outer edges are double steel pipes with phi 48.3 mm and 3.6mm, the distance is 450mm, and two phi 14mm opposite-pulling screws (22) are arranged between the outer edges on two sides.
7. The construction method for the conversion main beam of the reinforced engineering secondary beam is characterized in that the reinforcing beam (2) is mechanically connected in a reinforcing steel bar connection mode, a first-stage joint is adopted by the joint, pin key reinforcing steel bars phi 12@200 are uniformly distributed along the length direction of the primary secondary beam (1), the pin key reinforcing steel bars (24) are connected with the primary secondary beam (1) in a steel bar planting mode, the implantation depth is 100mm, the exposed length is 150mm, when the reinforcing steel bars meet 200 x 200H-shaped steel, holes are formed in a web plate of the H-shaped steel according to the size, the position and the elevation of the reinforcing steel bars, a row of bottom reinforcing steel bars are anchored into a primary structural column 10d at a side column, and two rows of reinforcing steel bars do not extend into the primary structural column.
8. The construction method for the conversion main beam of the reinforced engineering secondary beam, as set forth in claim 1, is characterized in that concrete is poured into the lower hanging part and the upturned part of the beam, the concrete mark is increased by one grade, when concrete is poured, the lower hanging beam or the upturned beam is respectively poured from the middle to the two sides in a pushing mode, the pouring height of each layer is not more than 450mm, the upper concrete is poured before the lower concrete is poured, and the concrete moisture preservation and maintenance duration time is not less than 28 days.

Description

Construction method for transforming main beams of secondary beams in reinforcement engineering Technical Field The invention relates to the technical field of building structure transformation, belongs to a construction method of reinforcement engineering in old building transformation, and in particular relates to a construction method of a secondary beam conversion main beam of reinforcement engineering. Background In the process of urbanization, a large number of old buildings have the problems of reduced structural safety, lagged use function and the like. To meet new use demands, it is often necessary to remove portions of the support columns to expand the space. The traditional reinforcement method has long construction period, high cost and larger influence on the original structure. In the prior art, although the joist column pulling process has certain application, the load transfer control in the construction process is inaccurate, the potential safety hazard of the structure is easy to cause, the construction period is long, and the material loss is large. In particular, in the reconstruction of old and old buildings of a brick-concrete structure, the original structural members are limited in size and strength, and higher requirements are put on the design of a temporary supporting system, the node construction and the reliability of the combination of new and old concrete in the construction process. The prior art often has the problems of insufficient rigidity of a supporting system, unreliable connection with the original structure, undefined dismantling and pouring sequence and the like, and potential safety hazards such as cracking, deformation and the like of the structure are easily caused during the transformation. Therefore, a construction method for converting the secondary beam into the main beam is needed to realize load redistribution and structural system optimization, which is safe, efficient and cost-controllable. Disclosure of Invention The invention aims to solve the defects in the prior art, and provides a construction method for a secondary beam conversion main beam in reinforcement engineering, which realizes safe, rapid and economic structural transformation through a modularized steel support system, staged pouring and a precise column cutting process. In order to solve the technical problems, the invention adopts the technical scheme that the construction method for converting the primary beam into the main beam in the reinforcement engineering comprises the steps of expanding the space by reconstruction of an old building, expanding the section of the primary beam according to structural load calculation, converting the primary beam into the main beam, namely the reinforcement beam, and dismantling three middle columns below the reinforcement beam, expanding the bearing column bearing surfaces at the two ends of the beam, wherein the construction method comprises the following steps of ① dismantling relevant loads, namely the reinforcement beam is a roof beam, dismantling all structural layers of the relevant roof during construction, unloading and clearing the roof; the support comprises a ② reinforced beam construction front support, support steel columns, cantilever beams, inclined support steel columns, ③ cutting of middle column heads, ④ beam two-side original house structural plates, ⑤ beam bottom die, beam side dies, beam upturning part templates, ⑥ reinforced beam steel bars, ⑦ beam down-hanging parts, beam upturning part concrete pouring and curing, ⑧ template removal, and template removal after the concrete strength reaches 100%. Preferably, the primary beam section is 300 x 600mm and the reinforcing beam section is 800 x 200mm. Preferably, the method comprises the steps of, the section of the original bearing columns at the two ends of the beam is 500 mm x 400mm, the cross section of the post-enlargement load-bearing column was 1000 x 900mm. Preferably, the first supporting steel column is formed by 300 x 300H-shaped steel below the primary beam, the second supporting steel column is formed by 200 x 200H-shaped steel below the primary beam, the inclined supporting steel column is formed by 20# I-shaped steel below the cantilever beam, wherein U-shaped brackets arranged at the top ends of the first supporting steel column and the second supporting steel column are respectively matched with the corresponding primary main beam and the primary beam and are fixed by expansion bolts, a jack is matched and installed between a surrounding column bracket arranged at the lower ends of the first supporting steel column and the second supporting steel column and a cushion steel plate fixedly connected to the bottom plate of the primary building, a steel plate is wedged between a seat plate at the lower end of the steel column and the cushion steel plate after the jacking is completed, the U-shaped bracket arranged at the top end of the inclined supporting steel column is