CN109235640B - A dowel-type connection structure between modular steel structure components for construction - Google Patents

Abstract

The invention discloses a dowel-type connection structure between modular steel structural members for construction. The connection structure includes connection units with lifting lugs as connection nodes. Several connection units are used to connect several columnar bodies to each other. The lifting lugs located at both ends of several connecting units are end lifting lugs, and the lifting lugs located between several connecting units are middle lifting lugs. The lifting lugs have a hollow frame structure, and the upper and lower sides of the lifting lugs are respectively provided with counter positions. Connectors and alignment connectors have screw rods passing through them. The screw rods between several connecting units are connected to each other through nuts. One end of the screw rod passing through the lower end lifting lug is fixedly connected to the embedded part. The screw rod and the nut It is used to interconnect several columnar bodies and connection units and provide prestressed tension; the alignment connector includes a base plate connected to the lifting lugs, and a frustum-shaped positioning block is provided on the base plate. The base plate and the positioning block are respectively There is a through hole whose position and size are relatively suitable for the screw to pass through.

Description

A pin-type connection structure between modular steel structural members for construction

Technical Field

The invention relates to the technical field of building components, and in particular to a pin-type connection structure between modular steel structural members for buildings.

Background Art

At present, high-rise construction mainly adopts the method of pouring concrete on site. The on-site construction of the structure generally goes through the construction process of supporting formwork, laying steel bars, pouring concrete and then removing the formwork. The on-site construction procedures and management are complicated, and the construction cost is high; there is a lot of construction waste, and the construction site is not easy to clean; the noise from on-site construction seriously affects the lives and work of surrounding residents and is not conducive to environmental protection; due to the influence of factors such as building materials, climatic conditions, on-site management, and worker quality, the quality of on-site construction is not easy to guarantee. The method of using prefabricated building components and connecting them on site to construct the building structure can overcome many of the above defects. However, there needs to be a connection structure between prefabricated building components that can ensure a firm connection between them.

In the prior art, patent documents CN201738600U and CN104314314A respectively disclose this type of assembled integral building, which includes an upper prefabricated component and a lower prefabricated component. The bottom of the upper prefabricated component is pre-buried with a steel sleeve, and a grouting hole is opened on the side wall of the steel sleeve near the end of the steel entrance, and a grouting hole is opened on the side wall of the steel sleeve away from the end of the steel entrance. The upper end of the lower prefabricated component is fixedly provided with a connecting steel bar suitable for extending into the steel sleeve at a position corresponding to the steel sleeve. During assembly, the connecting steel bar is inserted into the steel sleeve, and cement mortar is injected into the steel sleeve from the grouting hole and solidified to connect the upper prefabricated component and the lower prefabricated component. The longitudinal connecting steel bars on the lower prefabricated component of the above structure are exposed outside the component outline, which is easy to be damaged by collision during manufacturing and transportation, and the increased width of the steel bar also makes it easy to over-wide during transportation. It is easy to scratch the operator during installation, which poses a safety hazard. Furthermore, in the connection structure in the prior art, the portion of the steel bar extending into the sleeve is not prestressed, which also makes the connection strength of this connection portion a weak point of the entire building.

The most similar implementation scheme to the present invention in the existing steel frame structure building components is a connection node applied to modular steel structure buildings, which is used to connect the upper module and the lower module composed of four frame columns and eight frame beams. The upper module and the lower module respectively include two module units. The frame column and the frame beam of each module unit are connected by welding. An opening is provided on one side of the frame column of each module unit, and a sealing plate is welded at the bottom of the frame column. The sealing plate and the frame column are respectively provided with a first horizontal bolt hole and a first vertical bolt hole; the upper module and the lower module are interconnected by a cross-shaped node plate and high-strength bolts. The cross-shaped node plate and the high-strength bolts are interconnected. The cross-shaped node plate includes a horizontal plate and a vertical plate. The horizontal plate and the vertical plate are respectively provided with a second horizontal bolt hole and a second vertical bolt hole. The above-mentioned module connection structure cannot simultaneously solve the problems of insufficient shear resistance, poor integration and difficulty in alignment between the upper and lower modules of the structural connection system, and requires on-site welding. This connection method mainly has the disadvantages of complex construction, low construction efficiency, and easy deformation of the welding part.

The ideal connection system of modular buildings should conform to the characteristics of prefabricated buildings, and have the characteristics of good integration, fast connection speed and good mechanical properties. However, the commonly used connection systems cannot have the above characteristics at the same time, which hinders the development of modular steel structure buildings from low-rise to multi- and high-rise buildings. Therefore, the design of the connection system between modules is a technical problem that needs to be solved urgently.

Summary of the invention

The purpose of the present invention is to overcome the defects existing in the prior art and provide a connection between steel component modules that does not require welding and has the advantages of simple structure, reliable force transmission, strong structural integrity, etc. All connection work is completed outside the module, and a pin-type connection structure between modular steel structural members for construction that can perfectly match the internal decoration of the module.

To achieve the above-mentioned purpose, the technical solution of the present invention is to design a pin-type connection structure between modular steel structural members for construction, the connection structure includes a connection unit with a lifting ear as a connection node, a plurality of connection units are used to connect a plurality of columns to each other, the lifting ears located at both ends of the plurality of connection units are end lifting ears, and the lifting ears located between the plurality of connection units are middle lifting ears, the lifting ears are hollow frame structures, and counter-connecting pieces are respectively provided on the upper and lower sides of the lifting ears, screws are passed through the counter-connecting pieces, and the screws between the plurality of connection units are connected to each other by nuts, wherein one end of the screw passing through the end lifting ear at the lower end is fixedly connected to the embedded part, and the screw and the nut are used for the mutual connection between the plurality of columns and the connection units and provide prestressed tension; the counter-connecting piece includes a base plate connected to the lifting ear, a frustum-shaped positioning block is provided on the base plate, and through holes whose positions and sizes are relatively applicable to the passage of the screw are respectively provided on the base plate and the positioning block.

In order to facilitate processing and installation operations, the preferred technical solution is that the ear is a rectangular frame structure, and holes are provided on the upper, lower and side surfaces of the ear of the rectangular frame structure, and the upper and lower holes are used to embed the base plate.

In order to facilitate connection and ensure that the connection part has sufficient strength and stability, a further preferred technical solution is that the end lifting ear is provided with a base plate at its lower end or upper end, and the frustum-shaped positioning block arranged on the base plate protrudes toward the interior of the frame, and the end lifting ear is provided with two base plates on the upper side or lower side of the other end thereof, and the frustum-shaped positioning blocks arranged on the two base plates protrude toward the interior and the exterior of the frame respectively.

In order to facilitate connection and ensure that the connection part has sufficient strength and stability, a further preferred technical solution is that two base plates are respectively provided at the lower end and the upper end of the middle lifting ear, and the frustum-shaped positioning blocks arranged on the two base plates protrude toward the inside and the outside of the frame respectively.

In order to facilitate the connection and ensure that the connection part has sufficient strength and stability, a further preferred technical solution is that the frustum-shaped positioning blocks arranged on the bottom plate are two trapezoidal frustum-shaped positioning blocks.

In order to facilitate connection and ensure that the connecting parts have sufficient strength and stability, it is convenient to connect the symmetrically arranged matching connecting parts together. A further preferred technical solution is that the bottom plate of the upper and lower bottom plates of the lifting ear is respectively provided with connecting holes with corresponding positions and sizes, and the two bottom plates are connected by connecting bolts and nuts between the connecting holes.

In order to facilitate connection and ensure that the connection parts have sufficient strength and stability, and to facilitate relative adjustment between the mutually connected columns and adjustment between the connecting screws, a further preferred technical solution is that the columns connected to the upper and lower ends of the lifting ears are square tube columns, and a gap is provided between the inner wall of the square tube and the edge of the bottom plate, and a gap is also provided between the screw and the through hole through which it passes.

In order to facilitate the connection and ensure that the connection part has sufficient strength and stability, a further preferred technical solution is that the end ear at the lower end is welded to the columnar body at the lower end.

The advantages and beneficial effects of the present invention are as follows: the pin-type connection structure between modular steel structural members for buildings is a kind of connection between steel member modules that does not require welding, and has the advantages of simple structure, reliable force transmission, strong structural integrity, etc., and all connection work is completed outside the module, which can perfectly match the interior decoration of the module. The construction method shortens the construction period and improves the construction efficiency, and is particularly suitable for buildings with poor site construction environment and special construction time requirements. The connection nodes of the structure are the focus of modular prefabricated buildings, which need to meet the rapid construction of prefabricated buildings while ensuring the long-term structural stability during the use of the building. Therefore, this connection node focuses on solving the integrated design, integrating the hoisting, connection, bending resistance, shear resistance, and seismic resistance design of the structural system connection, and meeting the problem of accurate positioning of modular assembly.

The pin-type connection structure also has the characteristics of system integration, rapid construction and sustainable use. The pin-type connection structure can be fully integrated in the steel pipe column of the heavy steel structure and in a modular building lifting lug used for the pin-type connection structure, and can simultaneously solve the problems of modular steel structure building structural connection structure requiring welding, insufficient shear resistance, poor integration and difficulty in alignment between upper and lower modules, thereby improving the disassembly and assembly speed and safety performance of modular steel structure buildings, and providing an integrated structural connection method for the development from low-rise buildings to multi-story and high-rise buildings.

The pin-type connection structure can realize a highly assembled building that can be quickly assembled, and has the characteristics of fast construction speed, high standardization, and sustainability throughout the life cycle. The construction method of modular steel structure buildings is different from that of traditional buildings. Standardized modules are prefabricated in factories and transported to the construction site for connection and assembly after production. The entire construction process adopts dry operation, which can save a lot of manpower and material resources.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is an axial schematic diagram of a pin-type connection structure between modular steel structural members for construction according to the present invention;

FIG2 is a partial enlarged schematic diagram of three connection units in FIG1;

FIG3 is a top view of the lifting lug in FIG2 ;

Fig. 4 is a cross-sectional view of the lifting lug taken along line A-A in Fig. 3;

Fig. 5 is a cross-sectional view of the lifting lug taken along line B-B in Fig. 3;

Fig. 6 is a C-C sectional view of the lifting lug in Fig. 4;

FIG7 is a plan view of the aligning connector on the end lifting ear in FIG2;

FIG8 is a cross-sectional view of the A-A section of the end lifting ear of FIG7 ;

Fig. 9 is a B-B cross-sectional view of the alignment connector on the end lifting ear in Fig. 7;

FIG10 is a plan view of the aligning connector on the middle lifting ear in FIG2;

FIG11 is a cross-sectional view of the A-A portion of the alignment connector on the lifting ear at the middle end portion of FIG10;

Figure 12 is a B-B sectional view of the alignment connector on the middle lifting ear in Figure 10.

In the figure: 1, lifting ear; 1-1, end lifting ear; 1-2, middle lifting ear; 1-3, cavity; 2, columnar body; 3, alignment connector; 3-1, bottom plate; 3-2, positioning block; 3-3, connecting hole; 4, screw; 5, nut; 6, embedded part; 7, through hole.

DETAILED DESCRIPTION

The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention, and cannot be used to limit the protection scope of the present invention.

As shown in Figures 1 to 12, the present invention is a pin-type connection structure between modular steel structural members for construction, the connection structure includes a connection unit with a lifting ear 1 as a connection node, a plurality of connection units are used to connect a plurality of columnar bodies 2 to each other, the lifting ears 1 at both ends of the plurality of connection units are end lifting ears 1-1, the lifting ears 1 located between the plurality of connection units are middle lifting ears 1-2, the lifting ears 1 are hollow frame structures, and the upper and lower sides of the lifting ears are respectively provided with alignment connectors 3, and screws 4 are passed through the alignment connectors. , the screw rods 4 between several connecting units are interconnected by nuts 5, wherein one end of the screw rod 4 passing through the end ear 1-1 at the lower end is fixedly connected to the embedded part 6, and the screw rod 4 and the nut 5 are used to connect several columnar bodies 2 and the connecting units to each other and provide prestressed tension; the alignment connector 3 includes a base plate 3-1 connected to the ear 1, a frustum-shaped positioning block 3-2 is provided on the base plate 3-1, and a through hole 7 whose position and size are relatively applicable to the screw rod 4 passing through is provided on the base plate 3-1 and the positioning block 3-2 respectively.

The screw rod 4 adopts a standard full-thread shear screw rod, and the model of the standard full-thread shear screw rod can be determined according to the structural calculation, and then the size of the middle through hole 7 of the counter-connecting member, the model of the shear fastener and the nut 5 are determined. The nut 5 adopts a standard long connecting nut, and the model of the nut is determined according to the standard full-thread shear screw rod. For the convenience of transportation, the length of the standard full-thread shear screw rod is relatively short, and the long connecting nut is used to lengthen the shorter standard full-thread shear screw rod.

In order to facilitate processing and installation operations, a preferred embodiment of the present invention is that the ear 1 is a rectangular frame structure, and holes 1-3 are provided on the upper and lower sides and sides of the ear 1 of the rectangular frame structure, and the upper and lower holes 1-3 are used to embed the base plate 3-1.

In order to facilitate connection and ensure that the connection part has sufficient strength and stability, a further preferred embodiment of the present invention is that the end ear 1-1 is provided with a base plate 3-1 at its lower end or upper end, and the conical positioning block 3-2 arranged on the base plate protrudes toward the inside of the frame, and the end ear 1-1 is provided with two base plates 3-1 on the upper side or lower side of the other end, and the conical positioning blocks 3-2 arranged on the two base plates 3- protrude toward the inside and the outside of the frame respectively.

In order to facilitate connection and ensure that the connection part has sufficient strength and stability, a further preferred embodiment of the present invention is that two base plates 3-1 are respectively provided at the lower end and the upper end of the middle lifting ear 1-2, and the frustum-shaped positioning blocks 3-2 arranged on the two base plates 3-1 protrude toward the inside and the outside of the frame respectively.

In order to facilitate connection and ensure that the connection portion has sufficient strength and stability, a further preferred embodiment of the present invention is that the frustum-shaped positioning blocks 3-2 arranged on the base plate 3-1 are two trapezoidal frustum-shaped positioning blocks 3-2.

In order to facilitate connection and ensure that the connection parts have sufficient strength and stability, it is convenient to connect the symmetrically arranged counter-connecting parts 3 together, and a further preferred embodiment of the present invention is that the bottom plate 3-1 on which the upper and lower bottom plates of the lifting ear 1 are provided with connecting holes 3-3 with corresponding positions and sizes, and the two bottom plates 3-1 are connected by connecting bolts and nuts between the connecting holes 3-3.

In order to facilitate connection and ensure that the connection parts have sufficient strength and stability, and to facilitate relative adjustment between the mutually connected columns 2 and adjustment between the connecting screws 4, a further preferred embodiment of the present invention is that the column 2 connected to the upper and lower ends of the ear 1 is a square tube column, and a gap is provided between the inner wall of the square tube and the edge of the bottom plate 3-2, and a gap is also provided between the screw 4 and the through hole 7 through which it passes.

In order to facilitate connection and ensure that the connection portion has sufficient strength and stability, a further preferred embodiment of the present invention is that the end ear 1-1 at the lower end is welded to the columnar body 2 at the lower end.

The connection operation between the columns 2 can be carried out according to the following operating steps: weld the lowest ear 1 to the prefabricated column 2 through the alignment connector 3 and the support member, and after installing the base section, connect the screw 4, i.e., the prestressed tie rod, with the nut 5, so that the length of the screw 4 after connection with the nut 5 is longer than the length of the column 2, and then put the square tubular column 2 along the screw, and then put the next ear 1 and the alignment connector 3 on the upper end of the column 2, and repeat until the end ear 1 at the upper end is installed.

Prestressing test report

By modeling the building and applying corresponding loads to it, the axial force of the bottom column (mainly tensile force) is extracted in the PKPM calculation results. Then, by applying prestress, most of the tensile force is offset, while the building's anti-overturning ability is improved, that is, the impact of bending moment can be reduced, making the building a whole.

Through the calculation of PKPM, the maximum tensile force in the first layer of columns is extracted as F=61.3kN. According to the calculation that the prestress is offset by 85%, the prestress to be applied is F=50.0kN.

This prestressing is done with anchor rods and nuts. To reduce prestress loss, anti-skid washers and hexagonal iron toothed anti-loosening and anti-skid flange nuts are used. The size of the prestress is calculated by arranging a certain number of strain measurement points on the anchor rods. The diameter of the anchor rods tested in this test is 16mm, and the elastic modulus is According to F=EeA, it can be calculated that me=1244.

1. Prestressing data results of only one layer of columns

Four measuring points are evenly arranged on one layer of anchor rods, and the effective measuring point data are as follows (uε)

(uε)

2. Data results of prestressing of second-floor columns

Four measuring points are evenly arranged on the first and second layers of anchor rods, and the effective measuring point data are as follows:

The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims (5)

1. A dowel-type connection structure between modular steel structures for construction, characterized in that the connection structure includes connection units with lifting lugs as connection nodes, and several connection units are used to connect several columnar bodies to each other. connection, the lifting lugs located at both ends of several connecting units are end lifting lugs, and the lifting lugs located between several connecting units are middle lifting lugs. The lifting lugs are hollow frame structures, and the upper and lower sides of the lifting lugs are respectively provided with Alignment connectors. A screw rod passes between the alignment connectors. The screw rods between several connecting units are connected to each other through nuts. One end of the screw rod passing through the lower end lifting lug is fixedly connected to the embedded part. The screw rod and nuts are used to interconnect several columnar bodies and connecting units and provide prestressed tension; the alignment connector includes a base plate connected to the lifting lugs, and a frustum-shaped positioning block is provided on the base plate, and between the base plate and the positioning block There are corresponding through holes with corresponding positions and sizes for the screws to pass through. The lifting lugs are of a rectangular frame structure. Holes are provided on the upper, lower and side sides of the rectangular frame structure lifting lugs. The upper and lower holes are used for embedded bottom plates. The end lifting lug is provided with a bottom plate at its lower end or upper end, and a frustum-shaped positioning block provided on the bottom plate protrudes toward the inside of the frame. The end lifting lug is provided with a bottom plate on the upper or lower side of the other end. There are two bottom plates, and the frustum-shaped positioning blocks provided on the two bottom plates protrude toward the inside of the frame and the outside of the frame respectively. Two bottom plates are respectively provided at the lower end and the upper end of the middle lifting lug, and the frustum-shaped positioning blocks provided on the two bottom plates protrude toward the inside and outside of the frame respectively. 2. The dowel-type connection structure between modular steel structural members for construction according to claim 1, characterized in that the frustum-shaped positioning blocks provided on the bottom plate are two trapezoidal frustum-shaped positioning blocks. 3. The dowel-type connection structure between modular steel structural members for construction as claimed in claim 1, characterized in that the lifting lugs are provided with upper and lower base plates with corresponding positions and sizes respectively on the base plates. The connecting holes connect the two bottom plates through connecting bolts and nuts. 4. The dowel-type connection structure between modular steel structures for construction as claimed in claim 1, characterized in that the columnar bodies connected to the upper and lower ends of the lifting lugs are square tube holes. There is a gap. 5. The dowel-type connection structure between modular steel structural members for construction according to claim 4, characterized in that the end lifting lugs at the lower end and the columnar body at the lower end are welded and connected.