CN114232892B - Fabricated concrete connection structure connected through segmented reinforcing steel bars and construction method thereof - Google Patents

Abstract

The invention relates to an assembled concrete connection structure connected through segmented reinforcing steel bars, which comprises two concrete prefabricated parts with butt joint ends, wherein reserved pore canals are arranged in the connecting ends of the concrete prefabricated parts, the end heads of all main reinforcing steel bars in the concrete prefabricated parts are exposed out of the inner hole bottoms of the reserved pore canals, the end heads of the main reinforcing steel bars in the two inner hole bottoms are connected through a plurality of segmented connecting reinforcing steel bars positioned in the reserved pore canals, and cement paste filling layers are arranged in the reserved pore canals and used for filling gaps between the segmented connecting reinforcing steel bars and the reserved pore canals. The invention can be used for connecting prefabricated concrete structures, in particular to the prefabricated concrete structures which are required to be prefabricated to realize industrial production and directly assembled on site, has the advantages of less on-site construction wet operation, short construction period, guaranteed component quality, economy, environmental protection and the like, and has good engineering popularization prospect.

Description

Prefabricated concrete connection structure and construction method connected by segmental reinforcement

technical field

The invention relates to a prefabricated concrete connection structure connected by section steel bars and a construction method thereof, and relates to the field of civil engineering.

Background technique

With the transformation of the national economy and the adjustment of the industrial structure, our country is changing to a factory-like and standardized "manufacturing" method. At present, most of the structures in our country are constructed by cast-in-place reinforced concrete technology. With the promotion and application of prefabricated concrete technology, in order to ensure that the structural performance of prefabricated concrete structures is not lower than that of cast-in-place concrete structures, my country has also formulated corresponding technical regulations for concrete structures, including from structural design to component prefabrication and on-site construction. , the basic idea is to rationally disassemble the cast-in-place concrete structure, prefabricate components in the factory, and assemble them on site. Among them, disassembly is beneficial to factory prefabrication and on-site assembly, and the assembled structure must meet the safety and functional requirements of the structure. For this reason, various forms of disassembly and assembly connection methods have appeared, and the connection methods directly affect the construction speed and structural safety, and have received more widespread attention.

Compared with traditional cast-in-place concrete structures, there are more joints in prefabricated concrete structures. These joints not only directly determine the overall safety of the structure, but also affect the durability and practical functionality of the structure. The connection method of the prefabricated assembly structure needs to be considered comprehensively according to the structural form, seismic fortification intensity, construction, transportation, assembly and other factors. According to domestic and foreign experimental research and application research, through the comparison of several connection structures, considering the reliability of foreign experience and the acceptance of domestic concepts, the connection structure used in China is mostly the grouting sleeve connection structure. The threaded steel bar is inserted into the metal sleeve, and then the high-strength grouting material mixture is poured, and the bonding and anchorage formed between the grouting material and the threaded steel bar is used to transfer stress to realize the butt connection of the steel bar, which is referred to as the sleeve grouting connection. , can be divided into full grout sleeve connection and half grout sleeve connection.

The connection between the existing steel bar and the sleeve is usually completed by vertical insertion, which is difficult in construction technology. In the actual process, the measurement results of the respective positions of the sleeve and the inserted bar meet the requirements, but they still cannot be installed during splicing. The problem has caused a lot of application problems in actual engineering.

Contents of the invention

In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a prefabricated concrete connection structure connected by segmented steel bars and a construction method thereof.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a prefabricated concrete connection structure connected by segmented steel bars, including two concrete prefabricated components whose ends are butted, and the connecting ends of the concrete prefabricated components are provided with prefabricated The holes are reserved, and the ends of the main steel bars inside the prefabricated concrete components partly expose the inner hole bottoms of the reserved holes, and the ends of the main steel bars at the bottom of the two inner holes are connected through a plurality of segmented connecting steel bars located in the reserved holes. A cement slurry filling layer is arranged inside the reserved channels to fill the gap between the segmented connecting steel bars and the reserved channels.

Preferably, the section-connected steel bars are divided into three sections: two sections of short steel bars and one section of long steel bars; It will protrude out of the reserved channel; the reserved channel is formed by a pre-embedded bellows or a steel grouting sleeve.

Preferably, the long steel bar is located between the two reserved channels, two short steel bars are connected to both ends of the long steel bar through a steel bar sleeve, and the other end of the short steel bar is connected to the end of the main steel bar on the same side through a steel bar sleeve .

Preferably, the outer diameter of the reinforcement sleeve should be at least 15mm smaller than the inner diameter of the bellows or the steel grouting sleeve; the inner diameter of the reserved channel is at least 20mm larger than the outer diameter of the segmented connecting reinforcement.

Preferably, the side surfaces of the prefabricated concrete components are provided with reserved notches connecting the reserved channels, the positions of the reserved notches correspond to the short steel bars, and the size of the reserved notches should meet the requirement that the short steel bars can be placed along the reserved notches. into the reserved hole.

Preferably, the reserved notches are located on two opposite sides of the prefabricated concrete component.

Preferably, the reserved notches are located on two opposite sides of the precast concrete component and on one side between the two opposite sides.

A construction method of a prefabricated concrete connection structure connected by segmental steel bars, which is carried out in the following steps: (1) constructing a prefabricated component pedestal and installing a steel formwork: making a reinforced concrete pedestal or an all-steel structure pedestal, and laying a steel plate on it as a prefabricated component The bottom formwork and the outer formwork are designed with shaped steel formwork and pedestal. After the formwork is in place, the formwork is reinforced by pull bolts; (2) Binding and installation of reinforcement cages: check the bottom formwork and side formwork, and apply release agent , the hoisting reinforcement cage is put into the prefabricated steel formwork, and the thickness of the protective layer is fixed; (3) Install the end formwork and embedded parts: install the end formwork, install the bellows or steel grouting sleeves that are pre-embedded for segmental connection of steel bars The position of the corrugated pipe or steel grouting sleeve is fixed by the well-shaped positioning steel mesh; since the short steel bars in the segmented connecting steel bars need to be inserted from the side of the concrete prefabricated component, it is necessary to place the corrugated tube on the side of the concrete prefabricated component and the bellows Or the side of the steel grouting sleeve has long holes, and the bellows or steel grouting sleeve long holes need to be temporarily blocked to ensure that the concrete will not penetrate into the reserved long holes of the bellows or steel grouting sleeve; (4 ) Pouring concrete in the formwork: After the steel bars and formwork are accepted, the concrete is poured, and the attached vibrator is used to vibrate with a vibrating rod. Generally, the concrete does not sink, there is no significant bubble rise, and a thin layer of cement appears on the surface of the concrete. (5) Concrete curing: When the temperature is high, the strength of the concrete increases to meet the construction progress requirements, and natural curing is adopted; when the external temperature cannot meet the project progress requirements, steam curing is used; (6) Hoisting and installation of prefabricated concrete components: first place the long steel bars in the section-connected steel bars in the reserved channels of the precast concrete components on one side, and then lift and assemble the prefabricated concrete components connected in turn; (7) Installation Connecting steel bars and grouting: Put the short steel bars in the segmented connecting steel bars into the reserved channels through the reserved slots, and move half of the long steel bars through the reserved channels to the reserved channels of the concrete prefabricated components on the other side , the long steel bar and the short steel bar are connected through the steel bar sleeve; finally, the grouting material is slowly grouted in the grouting hole, the reserved hole and the reserved notch are filled with concrete, and cured; according to this cycle, several concretes are prefabricated The components are joined together.

Compared with the prior art, the present invention has the following beneficial effects: the present invention can be used for the connection of prefabricated concrete structures, especially for concrete structures that require prefabrication to realize industrial production in factories and direct assembly on site, and has the advantages of less wet work in on-site construction and less construction cost. It has the advantages of short cycle, guaranteed component quality, economical and environmental protection, etc., and has a good prospect for project promotion.

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a connection plan view of Embodiment 1 of the present invention.

Fig. 2 is the elevation view 1 of the connection state of Embodiment 1 of the present invention.

Fig. 3 is the second elevation view of the connection state of Embodiment 1 of the present invention.

Fig. 4 is the third elevation view of the connection state of Embodiment 1 of the present invention.

Fig. 5 is a sectional view of I-I in Fig. 2 .

FIG. 6 is a sectional view of II-II in FIG. 2 .

Fig. 7 is a connection elevation view of Embodiment 2 of the present invention.

Fig. 8 is a connection plan view of Embodiment 2 of the present invention.

Fig. 9 is a sectional view of III-III in Fig. 7 .

In the figure: 1-reserved tunnel, 2-steel bar sleeve, 3-reserved notch, 4-cement slurry filling layer, 5-fill concrete after notch, 6-long steel bar, 7-short steel bar, 8-main Steel bars, 9-joints, 10-concrete precast elements.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

As shown in Figures 1 to 9, this embodiment provides a prefabricated concrete connection structure connected by segmented steel bars, including two concrete prefabricated components whose ends are butt-jointed. The holes are reserved, and the ends of the main steel bars inside the prefabricated concrete components partly expose the inner hole bottoms of the reserved holes, and the ends of the main steel bars at the bottom of the two inner holes are connected through a plurality of segmented connecting steel bars located in the reserved holes. A cement slurry filling layer is arranged inside the reserved channels, and the cement slurry filling layer is grouting material or high-strength mortar. It is used to fill the gap between the section-connected steel bars and the reserved channels, so that the two-phase connected concrete prefabricated components can form a whole and jointly bear the force through the connection of the section-connected steel bars.

In the embodiment of the present invention, the segmented connecting steel bars are divided into three sections: two sections of short steel bars and one section of long steel bars; the length of the long steel bars should satisfy the , the long steel bars will not protrude out of the reserved channel, so that the prefabricated concrete components on one side can be placed in the reserved channel before installation, which is convenient for the installation of segmented connecting steel bars; the reserved channel is pre-embedded The corrugated pipe or steel grouting sleeve is formed into holes, and each main steel bar is inserted into a bellows or steel grouting sleeve of appropriate length during prefabrication.

In the embodiment of the present invention, the long steel bars are located between the two reserved channels, and the two short steel bars are connected to the two ends of the long steel bars through the steel bar sleeves, and the other end of the short steel bars is connected to the main steel bar on the same side through the steel bar sleeves. Rebar end connections. The main steel bar can also be overlapped with the steel bar in the reserved channel.

In the embodiment of the present invention, the outer diameter of the reinforcement sleeve should be at least 15mm smaller than the inner diameter of the bellows or the steel grouting sleeve; the inner diameter of the reserved channel is at least 20mm larger than the outer diameter of the segmented connecting reinforcement.

In the embodiment of the present invention, the side surfaces of the prefabricated concrete components are provided with reserved notches connecting the reserved channels, the positions of the reserved notches correspond to the short steel bars, and the size of the reserved notches should meet the requirement that the short steel bars can Put the notch into the reserved hole. Corresponding to the installation position of the short steel bar in the reserved channel, grooves are made on the side of the bellows or the steel grouting sleeve to facilitate the connection of the reserved notch to the reserved channel.

In Embodiment 1 of the present invention, the reserved notches are located on two opposite sides of the prefabricated concrete component. The reserved notch shall be sealed with concrete or high-strength mortar or grouting material higher than the concrete strength of the prefabricated concrete component, and the notch shall be filled with concrete after forming the notch.

In Embodiment 2 of the present invention, the reserved notches are located on two opposite sides of the precast concrete component and on one side between the two opposite sides. The difference between it and Embodiment 1 is that the direction of the reserved notch for excavation is different. In Embodiment 1, the reserved notch is opposite excavation, which can be used in most engineering applications, while in Embodiment 2, the side slope or placed on the foundation is considered In the case of connection on the upper side, due to the limitation of the operation surface, the reserved notch on one of the surfaces is changed to a reserved notch excavated on each side to facilitate construction and installation. The reserved notch shall be sealed with concrete or high-strength mortar or grouting material higher than the concrete strength of the prefabricated concrete component, and the notch shall be filled with concrete after forming the notch.

A construction method of a prefabricated concrete connection structure connected by segmented steel bars is carried out in the following steps:

(1) Construction of prefabricated component pedestals, installation of steel formwork: making reinforced concrete pedestals or all-steel structure pedestals, laying steel plates on top as the bottom formwork of prefabricated components, and the outer molds are designed with shaped steel formwork and pedestals. Pull bolts to reinforce the formwork;

(2) Binding and installing reinforcement cages: check the bottom formwork and side formwork, and apply release agent, hoist the reinforcement cage into the prefabricated steel formwork, and fix the thickness of the protective layer;

(3) Install the end formwork and embedded parts: install the end formwork, install the bellows or steel grouting sleeves that are pre-embedded for segmental connection reinforcement, and fix the bellows or steel grouting sleeves through the well-shaped positioning steel mesh position; since the short steel bars in the segmented connecting steel bars need to be inserted from the side of the concrete prefabricated component, long holes need to be opened on the side of the concrete prefabricated component, the side of the bellows or steel grouting sleeve, and the bellows or steel grouting The long hole of the sleeve needs to be temporarily blocked to ensure that it will not penetrate into the reserved long hole of the bellows or steel grouting sleeve when pouring concrete; the reserved hole can also be formed by embedding the bellows, and the spiral ribs are hooped outside the bellows , whose axis is consistent with the bellows axis;

(4) Concrete pouring in the formwork: concrete is poured after the steel bars and formwork are accepted, and the attached vibrator and vibrating rod are used to vibrate. Generally, the concrete will not sink, there will be no significant air bubbles rising, and the concrete surface will appear thinner. layer of grout until it has a uniform appearance and plane;

(5) Concrete curing: When the temperature is high, the strength of concrete increases to meet the construction progress requirements, and natural curing is adopted; when the external temperature cannot meet the project progress requirements, steam curing is used;

(6) Hoisting and installation of prefabricated concrete components: gantry cranes are used for mobile hoisting of prefabricated lattice beams in the field. Rubber pads for shock absorption and anti-friction are laid on the board, and the prefabricated components should be fixed after loading, and the fixing situation should be checked, and the vehicle can only start after meeting the requirements for safe transportation. First place the long steel bars in the section-connected steel bars in the reserved channel of the concrete prefabricated components on one side, and then lift and assemble the connected concrete precast components in sequence to ensure that the adjacent lattice beams (concrete prefabricated components) are at the joints. tight docking;

(7) Install connecting steel bars and grout: put the short steel bars in the segmental connecting steel bars into the reserved channels through the reserved slots, and move half of the long steel bars to the concrete prefabricated components on the other side through the reserved channels In the reserved channel, make both ends of the long steel bar expose a reserved length in the corresponding reserved notch, which is used for subsequent connection of the steel bar sleeve. The long steel bar and the short steel bar are connected through the steel bar sleeve; Slowly grouting, reserved channels and slots are filled with concrete, and then cured; according to this cycle, several concrete prefabricated components are spliced together.

The structure does not require curved bellows and steel bars, and prefabrication can save a lot of labor and improve manufacturing accuracy; during on-site construction, segmental steel bar connections are also easier to operate, which can reduce labor intensity and speed up construction, which has obvious economic benefits.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention to other forms. Any skilled person who is familiar with this profession may use the technical content disclosed above to change or modify the equivalent of equivalent changes. Example. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (1)

1. A prefabricated concrete connection structure connected by segmented steel bars, characterized in that: two concrete prefabricated components butt-jointed at the ends are included, the inside of the connection ends of the concrete prefabricated components are all provided with reserved channels, and the concrete prefabricated Part of the ends of the main steel bars inside the component are exposed at the bottom of the inner hole of the reserved hole, and the ends of the main steel bars at the bottom of the two inner holes are connected through a plurality of segmented connecting steel bars located in the reserved hole. A cement slurry filling layer is provided to fill the gap between the segmented connecting steel bar and the reserved channel; the segmented connecting steel bar is divided into three sections: two sections of short steel bar and one section of long steel bar; the length of the long steel bar should be Satisfied that when all are placed in the reserved channel of one side of the concrete prefabricated component, the long steel bars will not protrude from the reserved channel; the reserved channel is formed by a pre-embedded bellows or steel grouting sleeve; the long The steel bars are located between the two reserved channels, and the two short steel bars are connected to the two ends of the long steel bars through the steel bar sleeves, and the other end of the short steel bars is connected to the end of the main steel bars on the same side through the steel bar sleeves; the steel bar sleeves The outer diameter of the steel grouting sleeve should be at least 15mm smaller than the inner diameter of the bellows or the steel grouting sleeve; the inner diameter of the reserved channel is at least 20mm larger than the outer diameter of the segmented connecting steel bars; Reserve notches, the positions of the reserved notches correspond to the short steel bars, and the size of the reserved notches should be such that the short steel bars can be put into the reserved tunnel along the reserved notches; the reserved notches are located on both sides of the prefabricated concrete components on two opposite sides; the reserved notches are all located on two opposite sides of the prefabricated concrete component and on one of the sides between the two opposite sides; The following steps are carried out: (1) Construction of prefabricated component pedestal, installation of steel formwork: making reinforced concrete pedestal or all-steel structure pedestal, laying steel plates on it as the bottom formwork of prefabricated components, and the outer formwork adopts the matching design of shaped steel formwork and pedestal, and the formwork is accurately in place Finally, the formwork is reinforced by pulling bolts; (2) Binding and installation of reinforcement cages: check the bottom formwork and side formwork, and apply release agent, hoist the reinforcement cage into the prefabricated steel formwork, and fix the thickness of the protective layer; (3) Install the end formwork and embedded parts: install the end formwork, install the bellows or steel grouting sleeves that are pre-embedded for segmental connection reinforcement, and fix the bellows or steel grouting sleeves through the well-shaped positioning steel mesh position; since the short steel bars in the segmented connecting steel bars need to be inserted from the side of the concrete prefabricated component, long holes need to be opened on the side of the concrete prefabricated component, the side of the bellows or steel grouting sleeve, and the bellows or steel grouting The long hole of the sleeve needs to be temporarily blocked to ensure that it will not penetrate into the reserved long hole of the bellows or the steel grouting sleeve when pouring concrete; (4) Pouring concrete in the formwork: pouring concrete after the steel bars and formwork pass the acceptance , Vibrate with an attached vibrator and a vibrating rod. Generally, the concrete will no longer sink, there will be no significant air bubbles rising, and a thin layer of cement slurry will appear on the surface of the concrete, and it will have a uniform appearance and plane; (5) Concrete maintenance: when When the temperature is high, the strength of concrete increases to meet the requirements of the construction progress, and natural curing is adopted; when the external temperature cannot meet the requirements of the project progress, steam curing is used; The long steel bars are placed in the reserved channel of the concrete prefabricated components on one side, and the connected concrete precast components are lifted and assembled in sequence; (7) Connecting steel bars are installed and grouted: the short steel bars in the segmented connecting steel bars are passed through the reserved grooves Put the mouth into the reserved channel, and move half of the long steel bar through the reserved channel to the reserved channel of the concrete prefabricated component on the other side, and connect the long steel bar and the short steel bar through the steel bar sleeve; The grouting holes are slowly grouted, the reserved channels and notches are filled with concrete, and then cured; in this way, several prefabricated concrete components are spliced together.

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