CN-121976629-A - Thick plate construction method

CN121976629ACN 121976629 ACN121976629 ACN 121976629ACN-121976629-A

Abstract

The invention provides a thick plate construction method, which comprises a first casting layer, a second casting layer and a third casting layer, wherein the first casting layer, the second casting layer and the third casting layer are sequentially formed in the construction process, and the self-supporting prestress function is realized by utilizing the self structure, so that the supporting load born by a supporting formwork can be greatly lightened, the reliability and the stability of a temporary supporting system are ensured, the construction load preset for the construction thick plate at the lower layer of the thick plate is reduced, and the project construction cost is saved.

Inventors

LIU WEIYA
LI WUXIONG
LI HENG
WANG ZHIYU
Ru zhen

Assignees

深圳千典建筑结构设计事务所有限公司

Dates

Publication Date: 20260505
Application Date: 20260119

Claims (7)

1. The thick plate construction method is characterized by comprising a first casting layer, a second casting layer and a third casting layer, and comprises the following steps of: S1, acquiring construction design data, wherein the construction design data comprise supporting structure data, a layer thickness of first casting layers, the number of first casting layer steel bars, first casting layer steel bar arrangement data, a second casting layer thickness, the number of second casting layer steel bars, second casting layer steel bar arrangement data, a third casting layer thickness, the number of third casting layer steel bars and third casting layer steel bar arrangement data; S2, building a support die frame according to support structure data, wherein the support die frame comprises a plurality of vertically arranged temporary support columns and a plurality of horizontally arranged temporary support templates, the bottom ends of the temporary support columns are fixedly arranged on a lower floor, the temporary support templates are fixedly arranged at the top ends of the temporary support columns, and a plurality of temporary support templates form a temporary support platform; S3, paving a first-pouring layer bottom rib, a shearing-resistant tie rib, a prestress tensioning pipeline, a prestress reinforcing steel bar and a first-pouring layer top rib on the temporary supporting platform according to the number of the first-pouring layer reinforcing steel bars and the arrangement data of the first-pouring layer reinforcing steel bars, pouring concrete on the upper surface of the temporary supporting platform according to the thickness of the first-pouring layer to form a first-pouring layer, wherein the prestress reinforcing steel bars are arranged in the prestress tensioning pipeline in a penetrating manner, two ends of the prestress reinforcing steel bars are exposed at two ends of the prestress tensioning pipeline, the concrete on the first-pouring layer completely covers the first-pouring layer bottom rib, the prestress tensioning pipeline, the prestress reinforcing steel bars and the first-pouring layer top rib, and the concrete on the first-pouring layer partially covers the shearing-resistant tie bars; S4, after the initial setting of the concrete on the first casting layer, napping the upper surface of the initial setting concrete on the first casting layer; s5, tensioning the prestressed reinforcement for the first time after the strength of the concrete of the first casting layer reaches the design strength; S6, paving second pouring layer top ribs on the first pouring layer according to the number of the second pouring layer reinforcing bars and the second pouring layer reinforcing bar arrangement data, binding the shearing-resistant tie bars with the second pouring layer top ribs, pouring concrete on the upper surface of the first pouring layer according to the thickness of the second pouring layer to form a second pouring layer, wherein the concrete on the second pouring layer completely covers the second pouring layer top ribs, and the concrete on the second pouring layer partially covers the shearing-resistant tie bars; S7, synchronously tensioning the prestressed reinforcement for the second time when the second pouring layer is poured, and stopping tensioning after the prestressed tensioning value reaches the dead weight of the structure capable of balancing the first pouring layer and the second pouring layer; s8, after the concrete on the second pouring layer is initially set, napping the upper surface of the initially set concrete on the second pouring layer; S9, paving conversion member vertical steel bars and top surface vertical steel bars on the second pouring layer according to the number of steel bars of the third pouring layer and the arrangement data of the steel bars of the third pouring layer, and pouring concrete on the upper surface of the second pouring layer according to the thickness of the third pouring layer to form a third pouring layer, wherein the concrete on the third pouring layer completely covers and overlaps the shearing resistant tie bars and the top surface vertical steel bars, and the concrete on the third pouring layer partially covers the conversion member vertical steel bars.
2. The thick plate construction method according to claim 1, wherein the first casting layer bottom reinforcement, the prestressed reinforcement, the first casting layer top reinforcement, the second casting layer top reinforcement and the top surface longitudinal reinforcement are arranged along the horizontal and vertical directions; The shearing resistant lacing wire and the vertical steel bar of the conversion component are arranged along the vertical direction; The first casting layer bottom rib and the prestressed reinforcement are arranged on the temporary support template, and the first casting layer top rib is positioned above the corresponding positions of the first casting layer bottom rib and the prestressed reinforcement; The first pouring layer top rib is parallel to the first pouring layer bottom rib and the prestressed reinforcement, and the second pouring layer top rib is parallel to the first pouring layer top rib and the first pouring layer bottom rib.
3. The plank construction method of claim 1, wherein the thickness of the first casting layer is 30% of the overall thickness of the plank, the second casting layer is 25% of the overall thickness of the plank, and the third casting layer is 45% of the overall thickness of the plank.
4. The method according to claim 1, wherein in the step S4 and the step S8, the roughening treatment is performed on the upper surface of the initially set concrete specifically: The timber is placed on the upper surface of the initial concrete, vertical downward pressure is applied to the timber, and longitudinal grooves and transverse grooves are formed on the upper surface of the initial concrete.
5. The method according to claim 1, wherein tensioning the prestressed reinforcement in the step S5 and the step S7 is specifically: Fixing the fixed end of the prestressed reinforcement on the side surface of the first casting layer through a pier head anchor, fixing the tensioning end of the prestressed reinforcement through a conical anchor, and tensioning by applying tensioning force through a jack, so that the prestressed reinforcement is in a tight state in the prestressed tensioning pipeline.
6. The method according to claim 5, wherein the prestressed reinforcement is parallel to each other, and the fixed ends and the tension ends of the adjacent two prestressed reinforcements are staggered.
7. The method according to claim 5, wherein in the step S7, after the prestressed reinforcement is tensioned for the second time, concrete grout is injected into the prestressed tension pipe and the concrete in the prestressed tension pipe is cured.

Description

Thick plate construction method Technical Field The invention relates to the technical field of building structures, in particular to a reinforced concrete thick plate construction method for realizing load self-bearing by utilizing prestress. Background The urban high-speed development is accompanied with engineering construction technology iteration, and modern buildings are used for residence and office, and also integrate functions of public transportation, large-space market and the like. When the columns and the shear walls of the upper and lower parts of the building are not aligned (for example, the bottom is a large space market, and the upper part is a shear wall structure house), a structural layer needs to be arranged in the middle to bear the load of the upper tower which is huge to lift up and down and transfer. The structural layer can be a very thick reinforced concrete slab, called a 'conversion thick plate' or a 'thick plate', and the characteristics of the structural layer include extremely high rigidity, extremely high bearing capacity and the like. In order to ensure that the business and basement of each layer of lower part has larger space to meet the building functions, the thick plate is usually provided with a frame pillar at the bottom, the upper part is provided with a conversion thick plate, and the thick plate is designed into a discontinuous structural member such as a residential tower and the like and the lower frame pillar. Such structures are most commonly used in mass transit oriented development TOD projects in metropolitan areas where the loading capacity is provided by the placement of slabs, integrating residential, office and mass transit functions into one building. The greatest problem in the construction of the thick plate at present is that the concrete consumption of the thick plate is huge and the thick plate is difficult to finish pouring once, meanwhile, the dead weight of the thick plate also provides high requirements for a supporting system during construction, and the conventional construction scheme is difficult to provide enough temporary bearing capacity, so that the civil engineering investment cost is greatly increased. There is a need in the industry to propose a new solution to the above-mentioned problems. Disclosure of Invention The technical problem to be solved by the invention is to provide a thick plate construction method, aiming at the defects in the prior art, and the functions of self-supporting thick plate construction loads can be realized by utilizing the structure of the thick plate and the prestress technology through layering pouring to form a first pouring layer, a second pouring layer and a third pouring layer. The technical scheme adopted for solving the technical problems is as follows: a method of constructing a plank comprising a first casting layer, a second casting layer, and a third casting layer, the method comprising the steps of: S1, acquiring construction design data, wherein the construction design data comprise supporting structure data, a layer thickness of first casting layers, the number of first casting layer steel bars, first casting layer steel bar arrangement data, a second casting layer thickness, the number of second casting layer steel bars, second casting layer steel bar arrangement data, a third casting layer thickness, the number of third casting layer steel bars and third casting layer steel bar arrangement data; S2, building a support die frame according to support structure data, wherein the support die frame comprises a plurality of vertically arranged temporary support columns and a plurality of horizontally arranged temporary support templates, the bottom ends of the temporary support columns are fixedly arranged on a lower floor, the temporary support templates are fixedly arranged at the top ends of the temporary support columns, and a plurality of temporary support templates form a temporary support platform; S3, paving a first-pouring layer bottom rib, a shearing-resistant tie rib, a prestress tensioning pipeline, a prestress reinforcing steel bar and a first-pouring layer top rib on the temporary supporting platform according to the number of the first-pouring layer reinforcing steel bars and the arrangement data of the first-pouring layer reinforcing steel bars, pouring concrete on the upper surface of the temporary supporting platform according to the thickness of the first-pouring layer to form a first-pouring layer, wherein the prestress reinforcing steel bars are arranged in the prestress tensioning pipeline in a penetrating manner, two ends of the prestress reinforcing steel bars are exposed at two ends of the prestress tensioning pipeline, the concrete on the first-pouring layer completely covers the first-pouring layer bottom rib, the prestress tensioning pipeline, the prestress reinforcing steel bars and the first-pouring layer top rib, and the concrete on the first-pouring layer parti