Construction process of dry-type fully-assembled industrialized concrete primary and secondary beam joints

文档序号：1872569 发布日期：2021-11-23 浏览：31次中文

阅读说明：本技术 一种干式全装配工业化混凝土主次梁节点的施工工艺 (Construction process of dry-type fully-assembled industrialized concrete primary and secondary beam joints ) 是由沈华于 2021-09-08 设计创作，主要内容包括：本发明提供一种干式全装配工业化混凝土主次梁节点的施工工艺,包括工厂制造和现场安装两个步骤,其中,工厂制造时分别单独制造型钢牛腿组件、预制主梁和预制次梁,现场安装包括如下步骤：(2-1)验收合格的型钢牛腿组件、预制主梁和预制次梁运输至施工现场；(2-2)采用双头螺栓连接副将型钢牛腿固定于预制主梁的侧方,并检验尺寸和定位的准确；(2-3)吊运预制次梁至预定位置,对齐上、下定位钢板和短型钢上方翼缘的次梁固定螺栓孔后,采用高强螺栓固定；(2-4)预制主、次梁节点空隙处填充防腐材料。本发明提出了一整套新型干式全装配工业化混凝土主次梁节点的构造和施工工艺,相对于其他方案具有更好的力学性能、可靠性、经济性、灵活性和适应性。(The invention provides a construction process of a dry-type fully-assembled industrialized concrete primary and secondary beam joint, which comprises two steps of factory manufacture and field installation, wherein a section steel bracket assembly, a prefabricated main beam and a prefabricated secondary beam are respectively and independently manufactured during factory manufacture, and the field installation comprises the following steps: (2-1) transporting the section steel corbel assembly, the prefabricated main beam and the prefabricated secondary beam which are qualified in acceptance to a construction site; (2-2) fixing the profile steel bracket on the side of the prefabricated main beam by adopting a stud bolt connecting pair, and checking the size and the positioning accuracy; (2-3) hoisting the prefabricated secondary beam to a preset position, aligning the upper and lower positioning steel plates and the secondary beam fixing bolt holes of the short section steel upper flange, and fixing by adopting a high-strength bolt; and (2-4) filling anticorrosive materials in the gaps of the joints of the prefabricated main beam and the prefabricated secondary beam. The invention provides a whole set of novel dry-type fully-assembled industrialized concrete primary and secondary beam joint construction and construction process, and the concrete primary and secondary beam joint has better mechanical property, reliability, economy, flexibility and adaptability compared with other schemes.)

1. The construction process of the dry-type fully-assembled industrialized concrete primary and secondary beam node is characterized in that the dry-type fully-assembled industrialized concrete primary and secondary beam node comprises a prefabricated main beam, a prefabricated secondary beam, a profile steel bracket assembly and a secondary beam fastening assembly, wherein the prefabricated secondary beam is fixedly connected to the side of the prefabricated main beam through the profile steel bracket assembly and the secondary beam fixing assembly;

the profile steel bracket assembly comprises a stud bolt connecting pair, a connecting end plate and short profile steel, wherein one end of the stud bolt connecting pair is fixedly connected with the connecting end plate, the other end of the stud bolt connecting pair is in threaded connection with a through bolt hole, the side of the short profile steel is fixedly connected with the connecting end plate, and a secondary beam fixing bolt hole is formed in the upper flange of the short profile steel;

the secondary beam fastening assembly comprises an upper positioning steel plate and a high-strength bolt, and the high-strength bolt sequentially penetrates through the upper positioning steel plate and the prefabricated secondary beam and then is in threaded connection with a secondary beam fixing bolt hole;

the construction process of the dry-type fully-assembled industrialized concrete primary and secondary beam joint comprises the following steps:

(1) factory manufacturing: separately manufacturing section steel bracket assembly, prefabricated main beam and prefabricated secondary beam

(1-1) profiled bar corbel Assembly

(1-1-1) according to design requirements, selecting the specification and the design length of the section steel, and cutting and forming the short section steel;

(1-1-2) reserving a secondary beam fixing bolt hole on the upper flange of the short section steel according to the design requirement;

(1-1-3) cutting and forming a connecting end plate according to the design requirement;

(1-1-4) forming a split bolt hole on the connecting end plate;

(1-1-5) welding short section steel with the side surface of a connecting end plate according to the requirement of a designed welding line to manufacture a section steel corbel assembly;

(1-1-6) carrying out anti-corrosion treatment on the surface of the section steel corbel component;

(1-2) prefabricated girder

(1-2-1) blanking reinforcing steel bars, bending, forming and binding a prefabricated main beam reinforcing cage, wherein the prefabricated main beam reinforcing cage comprises main beam upper longitudinal bars, main beam lower longitudinal bars and main beam stirrups;

(1-2-2) cutting a positioning steel plate for positioning a main beam split bolt according to design requirements;

(1-2-3) forming split bolt holes in the positioning steel plate according to the designed aperture and distribution;

(1-2-4) after a release agent is coated, installing a bolt hole channel pipe between the positioning steel plates on the two sides, and forming a split bolt channel in the main beam;

(1-2-5) temporarily fixing the positioning steel plates on the beam end side dies of the main beams respectively, and accurately controlling the positions of the secondary beams and the bolts;

(1-2-6) after a release agent is coated in the vertical main beam template, pouring main beam concrete;

(1-2-7) when the concrete reaches a certain strength and the formwork is removed without missing edges and falling corners, removing the beam side formwork;

(1-2-8) drawing out the bolt hole pipeline to form a through bolt hole, and temporarily plugging by adopting a soft material after checking and accepting the aperture and smoothness;

(1-2-9) carrying out anti-corrosion treatment on exposed steel plates in the prefabricated main beam;

(1-2-10) performing high-temperature autoclaved curing on the prefabricated main beam, and removing the bottom template after the concrete reaches the designed strength;

(1-3) prefabricated Secondary Beam

(1-3-1) blanking reinforcing steel bars, bending, forming and binding a prefabricated secondary beam reinforcing cage, wherein the prefabricated secondary beam reinforcing cage comprises secondary beam upper longitudinal bars, secondary beam lower longitudinal bars and secondary beam stirrups;

(1-3-2) cutting the built-in section steel according to the size required by the design, and placing the cut built-in section steel into a reinforcement cage at the connecting end;

(1-3-3) cutting upper and lower positioning steel plates for accurately positioning the bolts and locally bearing pressure according to design requirements;

(1-3-4) according to the designed aperture and distribution, arranging bolt holes for fixing secondary beams on the upper and lower positioning steel plates;

(1-3-5) after a release agent is coated outside, installing a bolt hole channel pipe between the upper positioning steel plate and the lower positioning steel plate, and forming a split bolt channel in the secondary beam;

(1-3-6) temporarily fixing the lower positioning steel plate at the accurate position of the bottom template of the prefabricated secondary beam to ensure the lower end position of the bolt pore channel;

(1-3-7) temporarily fixing the upper positioning steel plate on the beam side mold to ensure the upper end position of the bolt pore passage;

(1-3-8) after a release agent is coated in the vertical secondary beam template, pouring secondary beam concrete;

(1-3-9) when the concrete reaches a certain strength and the formwork is removed without missing edges and falling corners, removing the beam side formwork;

(1-3-10) drawing out the bolt hole pipeline, checking the acceptance aperture and smoothness, and temporarily plugging by adopting a soft material;

(1-3-11) carrying out anti-corrosion treatment on the exposed steel plate in the prefabricated secondary beam;

(1-3-12) performing high-temperature autoclaved curing on the prefabricated secondary beam, and removing the bottom template after the concrete reaches the designed strength;

(2) installation in situ

(2-1) after the section steel corbel assembly, the prefabricated main beam and the prefabricated secondary beam manufactured in a factory are accepted, transporting the section steel corbel assembly, the prefabricated main beam and the prefabricated secondary beam to a construction site;

(2-2) fixing the profile steel bracket on the side of the prefabricated main beam by adopting a stud bolt connecting pair, and checking the size and the positioning accuracy;

(2-3) hoisting the prefabricated secondary beam to a preset position, aligning the upper and lower positioning steel plates and the secondary beam fixing bolt holes of the short section steel upper flange, and fixing by adopting a high-strength bolt;

and (2-4) filling anticorrosive materials in gaps of the joints of the prefabricated main beams and the prefabricated secondary beams.

2. The construction process of the dry-type fully-assembled industrial concrete primary and secondary beam joint according to claim 1, wherein the connecting end of the prefabricated secondary beam is provided with a double-layer gap, the outer gap is used for accommodating an end cap of the connecting end plate and the stud bolt connecting pair, and the inner gap is used for accommodating the short-section steel.

3. The construction process of the dry-type fully-assembled industrial concrete primary and secondary beam joint as claimed in claim 1, wherein the secondary beam fastening assembly further comprises a lower positioning steel plate, the upper and lower positioning steel plates are correspondingly positioned at the upper and lower sides of the prefabricated secondary beam, and the high-strength bolt sequentially penetrates through the upper positioning steel plate, the prefabricated secondary beam and the lower positioning steel plate and then is in threaded connection with the secondary beam fixing bolt hole.

4. The construction process of the dry-type fully-assembled industrialized concrete main and secondary beam joint according to any one of claims 1-3, characterized in that the prefabricated secondary beam is internally embedded with the secondary beam upper longitudinal ribs, the secondary beam stirrups and the secondary beam lower longitudinal ribs, and the built-in section steels and the reinforced longitudinal ribs are embedded inside the connecting ends of the prefabricated secondary beam.

5. The construction process of the dry-type fully-assembled industrial concrete primary and secondary beam joint as claimed in claim 1, wherein the prefabricated main beam is embedded with main beam upper longitudinal ribs, main beam stirrups and main beam lower longitudinal ribs, and the prefabricated main beam is embedded with additional stirrups and hanging ribs inside the position where the prefabricated secondary beam is connected.

6. The construction process of the dry-type fully-assembled industrial concrete primary and secondary beam joint according to claim 4, wherein the built-in section steel is H-shaped steel.

7. The construction process of the dry-type fully-assembled industrial concrete primary and secondary beam joint as claimed in claim 1, wherein the short steel section is H-shaped steel, and a stiffening rib is arranged between a flange and a web of the short steel section.

Technical Field

The invention belongs to the field of prefabricated concrete structure engineering, and particularly relates to a construction process of a dry-type fully-assembled industrialized concrete primary and secondary beam joint.

Background

The industrial concrete structure is a concrete member produced in a factory, and is transported to a construction site for installation after being maintained and accepted, and is a novel industrial construction mode. The development of an industrialized concrete structure is beneficial to promoting the energy conservation and emission reduction of the building industry, improving the labor productivity, ensuring the engineering quality, promoting the reformation of the supply side and dissolving the surplus capacity, and finally achieving the industrialization and informatization of the building industry. The design of the building structure node is very critical, the influence on the mechanical property of the whole structure is obvious, and the node is particularly more important for an industrialized concrete structure.

From the aspect of node construction, the following three types of industrial concrete primary and secondary beam nodes are mainly available:

(1) the main beam is provided with a post-pouring belt, namely, a transverse groove is arranged at the joint of the main beam, the end part of the secondary beam is lapped at the groove, and the groove concrete of the main beam is poured for the second time to realize the connection of the primary beam and the secondary beam. However, the main beam groove becomes a weak position, which may cause problems such as cracking and even breaking of the main beam during transportation and installation.

(2) The secondary beam is provided with a post-pouring section, namely a post-pouring section is reserved at the end part of the secondary beam, and secondary beam end concrete is poured for the second time after the secondary beam outlet rib is connected with the main beam reserved longitudinal rib, so that the connection of the main beam and the secondary beam is realized. The mode ensures the continuity and the integrity of the main beam, but the steel bar connection technology is adopted, and meanwhile, the reserved notch and the end part are provided with ribs, which also brings difficulty to transportation and installation.

(3) The secondary beam is placed on the bracket or the ear of the main beam, the method is convenient, and dry type full assembly connection is easy to realize. The defects are that if the bright corbels are adopted, the local clear height and the appearance are influenced, and the secondary beam with the gap at the end part is adopted by the dark corbels, the bearing capacity of the beam end is insufficient due to the weakening of the local section.

For example, the chinese invention patent CN2017103092070 discloses a prefabricated primary and secondary beam installation structure and an installation method, wherein the installation structure comprises prefabricated brackets arranged on the side portions of prefabricated main beams, and an assembly groove arranged at the end portion of the prefabricated secondary beams, and each prefabricated bracket comprises a flange for placing the bottom of the prefabricated secondary beam and a web plate inserted into the assembly groove. The assembled main and secondary beam structure does not need to be provided with a post-cast section, reduces on-site wet operation, does not need to be provided with excessive connecting reinforcing steel bars, has simple structure, clear force transmission, does not need on-site welding, has low labor cost and quick construction, and can obviously shorten the construction period. The invention has the following disadvantages: 1. the essence of the node is that the hidden corbels are placed, and the prefabricated main beam needs to be embedded with the inverted T-shaped steel corbels, so that the difficulty is brought to manufacturing, storage and transportation. 2. The pure hinge connection mode has certain shearing resistance bearing capacity but cannot provide bending moment bearing capacity, so that a simple beam mode can be realized, a continuous beam mechanical model cannot be realized, and the application range is greatly limited.

From the aspect of construction mode, the industrial concrete structure is mainly divided into two types: one type is wet connection, generally needs on-site secondary concrete material pouring and other wet operations, and the common assembly integral type node is typical wet connection, and has the advantages of low requirement on construction precision and the disadvantages of complex construction procedure, dense node steel bars, lower installation efficiency and long maintenance time; the other type is a dry type connection, also called a full-assembly joint, which has the advantages of high installation efficiency but high requirements on manufacturing and construction precision. Obviously, the dry connection has the characteristics of building industrialization and has better development prospect.

The Chinese invention patent CN111997194A discloses an assembled concrete primary and secondary beam structure and a dry-type connection method thereof, wherein an overhanging beam with a notch is extended from one side of a precast concrete main beam, a steel bar channel is reserved in the main beam, and an embedded part formed by welding steel plates and bolts is embedded below the notch of the overhanging beam; the prefabricated concrete secondary beam is provided with a secondary beam end gap from top to bottom, a bolt channel is reserved at the connecting end of the secondary beam, and a reinforcing steel bar is reserved at the beam end of the secondary beam; the beam end of the secondary beam is lapped on the notch of the outward extending beam, the bolt of the embedded part penetrates through the bolt channel of the beam end, a steel plate with a bolt through hole is arranged on the beam end, and then the steel plate is fastened by a nut; the connecting piece of the main beam and the secondary beam is formed by welding steel plates and steel bars, and the steel bars penetrate through the steel bar channel of the main beam and then are connected with the reserved steel bars at the beam end through steel bar sleeves. The invention has the advantages that the connection mode adopts dry operation construction, thereby saving energy, protecting environment and simplifying construction; the connection is reliable, the integrity is good, and the rigidity is obviously improved; the industrialization efficiency of the method is obviously improved, and generalization and standardization can be realized. The invention has the following disadvantages: 1. the shape and the section of the component of the main beam with the notch on the side are seriously irregular, so that the difficulty is brought to the manufacture, storage and transportation of the main beam; 2. the overhanging secondary beam longitudinal bars are connected with the main beam steel bar sleeves, the precision of steel bar positioning and sleeve reserved positions is required to be extremely high, and the assembly construction difficulty is high; 3. the manufacturing process of the steel bar sleeve is complex and has high cost, no effective detection means exists at present, and the engineering quality is difficult to ensure; 4. the width of the overhanging notch is larger than that of the secondary beam to form an expanded head, so that the external appearance of the primary and secondary beam connecting node is influenced; 5. the section of the gap secondary beam is greatly weakened, so that the shearing-resistant bearing capacity of the section is reduced, but no effective reinforcing measure is provided in the construction.

Disclosure of Invention

The invention aims to solve the technical problem of providing a construction process of a dry-type fully-assembled industrialized concrete primary and secondary beam joint, which accords with the development trend of building industrialization, creatively introduces steel reinforced concrete into a shelving type primary and secondary beam joint, effectively solves the problem of insufficient bearing capacity at a secondary beam gap, and effectively improves the mechanical property of the secondary beam with the end gap.

In order to solve the technical problems, an embodiment of the invention provides a construction process of a dry-type fully-assembled industrialized concrete primary and secondary beam node, wherein the dry-type fully-assembled industrialized concrete primary and secondary beam node comprises a prefabricated main beam, a prefabricated secondary beam, a profile steel bracket assembly and a secondary beam fastening assembly, the prefabricated secondary beam is fixedly connected to the side of the prefabricated main beam through the profile steel bracket assembly and the secondary beam fixing assembly, a positioning steel plate is pre-embedded in the position of the prefabricated main beam connected with the prefabricated secondary beam, a through bolt hole is reserved in the position of the prefabricated main beam, and the secondary beam fastening assembly is fixedly connected above the connecting end of the prefabricated secondary beam, which is used for being connected with the prefabricated main beam;