CN205531375U - A structure for last prestress application of steel frame - Google Patents

Abstract

The utility model discloses a structure for applying prestress on a steel roof truss, which comprises an upper chord, a lower chord, a web, and a U-shaped plate arranged at the joint between the lower chord and the web; the U-shaped plate There are two annular tubes at the bottom of the U-shaped plate, and the annular tubes are integrated with the U-shaped plate; connecting pipes are arranged between the annular tubes; the lower chord is inserted into the annular tube from both ends of the U-shaped plate, and connected to the The tubes are connected by threads; by turning the connecting tubes, the left and right bottom chords can approach or separate at the same time. In the utility model, a U-shaped plate is arranged on the node of the lower chord, and an appropriate reverse stress is applied to the lower chord through the connecting pipe on the U-shaped plate, so that the lower chord can effectively use materials and shrink The size of the section not only reduces its own weight, but also reduces the production cost. The stress situation of the lower chord of the existing steel roof truss is well improved, and the section size of the lower chord is effectively reduced while ensuring the safety of the house.

Description

A structure for applying prestress on steel roof truss

technical field

The utility model relates to the field of steel roof trusses, in particular to a structure for applying prestress on the lower chord node of the steel roof truss.

Background technique

Most of the steel roof truss adopts a truss structure system, and the truss structure is mainly composed of upper chords, lower chords and web members. It will generate a horizontal thrust to the support and has good stability. However, due to the large axial force on the upper and lower chords, the designed section of the upper and lower chords will be larger, the cost of materials will be high, and the manufacture will be difficult. Moreover, the larger size will increase its own weight and increase other rods. burden.

Therefore, the existing steel roof truss structure needs to be further improved and perfected.

Utility model content

The purpose of this utility model is to provide a structure for applying prestress on the steel roof truss, aiming at improving the stress situation of the upper and lower chords of the existing steel roof truss, and reducing the section size of the lower chord while ensuring the safety of the house.

The technical scheme designed by the utility model is as follows:

A structure for applying prestress on a steel roof truss, including an upper chord, a lower chord, a web arranged between the upper chord and the lower chord, and a U-shaped plate arranged at the connection between the lower chord and the web; The lower chords are connected by U-shaped plates, and the U-shaped plates are threadedly connected with the lower chords; one end of the web is fixedly connected with the upper chord, and the other end is fixed on the U-shaped plate; the bottom of the U-shaped plate is set There are two annular tubes, and the annular tubes are integrated with the U-shaped plate; there is a movable connecting tube with internal threads between the annular tubes; the end of the lower chord is provided with external threads, and the lower chord The rods are inserted into the annular pipe from both ends of the U-shaped plate, and are connected with the connecting pipe through threads; by rotating the connecting pipe, the left and right lower chords are simultaneously approached or separated at the same time.

In the structure for applying prestress on the steel roof truss, bolt holes are provided on both sides of the U-shaped plate, and the web is fixedly connected to the U-shaped plate through bolts.

In the structure for applying prestress on the steel roof truss, the web member and the upper chord are fixed by welding.

In the structure for applying prestress on the steel roof truss, the U-shaped plate is made of steel plate.

The structure for applying prestress on the steel roof truss, wherein, the opposite sides of the U-shaped plate are provided with grooves for fixing the web; the grooves are arranged on the inner wall of the U-shaped plate, from the upper end Extending vertically downward, the web bar is clamped in the groove.

To sum up, the utility model sets a U-shaped plate on the joint of the lower chord, and applies an appropriate reverse stress to the lower chord through the connecting pipe on the U-shaped plate, so that the lower chord can The effective use of materials and the reduction of cross-sectional dimensions not only reduce its own weight, but also reduce production costs. The stress situation of the lower chord of the existing steel roof truss is well improved, and the section size of the lower chord is effectively reduced while ensuring the safety of the house.

Description of drawings

Fig. 1 is a structural schematic diagram of the steel roof truss provided by the utility model.

Fig. 2 is a three-dimensional structure diagram of the node of the lower chord provided by the utility model.

Fig. 3 is a front view of the node of the lower chord provided by the utility model.

Fig. 4 is a perspective view of the U-shaped plate provided by the utility model.

Fig. 5 is a cross-sectional view of the U-shaped plate provided by the utility model.

Fig. 6 is a left view of the U-shaped plate provided by the utility model.

detailed description

In order to make the purpose, technical solution and advantages of the utility model more clear and definite, the utility model will be further described below with reference to the accompanying drawings and examples.

As shown in Figure 1, Figure 2 and Figure 3, the utility model discloses a structure for applying prestress on a steel roof truss, which includes an upper chord 100, a lower chord 200, and the upper chord 100 and the lower chord 200 The web 300 between them, the U-shaped plate 400 arranged at the joint between the lower chord 200 and the web 300 ; One end of the web 300 is fixedly connected with the upper chord 100 , and the other end is fixed on the U-shaped plate 400 ; preferably, the web 300 and the upper chord 100 are fixed by welding. Specifically, as shown in FIG. 4 , FIG. 5 and FIG. 6 , two annular tubes 410 are provided at the bottom of the U-shaped plate 400 , and the annular tubes 410 and the U-shaped plate 400 are integrated. A connecting pipe 420 with an internal thread is disposed between the annular pipes 410 . The ends of the lower chord 200 are provided with external threads, and the lower chord 200 is inserted into the annular pipe 410 from both ends of the U-shaped plate 400 and connected with the connecting pipe 420 through threads. By rotating the connecting pipe 420, the left and right lower chords 200 are approached or separated at the same time; when they are close together and pressed against each other, the lower chords 200 are pre-applied with compressive stress, which offsets the axial tensile force; when they are separated at the same time, The lower chord 200 has a preset spacing, and an appropriate distance is reserved for bearing axial tension.

The working principle of the utility model is that on the steel roof truss of the multi-section lower chord 200, the lower chord 200 is subjected to axial pressure or tension; After the rod 200 is installed, it cancels out the received axial force, or reduces the received axial force; due to the reduction of the axial force, the cross-sectional area of the lower chord 200 can also be correspondingly reduced under the premise of ensuring technical and safety performance.

The installation process of the present utility model is as follows:

Firstly, carry out cross-section design according to the requirements of bearing capacity, and determine the cross-sectional dimensions of the upper chord 100, lower chord 200, and web 300 respectively; at the same time, attention should be paid to the prestressed lower chord 200, and the application of prestress should be considered when designing the cross-sectional size , by rationally adjusting the section size, the amount of steel used and its own weight can be effectively reduced. On the premise that the technical and safety requirements are met, prestress can be applied to the lower chord 200 in sections, so as to use materials more effectively and fully.

Then, when installing the upper chord 100 and the web 300, the length of the weld should be calculated according to the overall stress of the steel roof truss, and welded after calculation to meet the strength requirements of the joint.

Next, install the lower chord 200, the node between the lower chord 200 and the lower chord 200 is threaded through the U-shaped plate 400, the U-shaped plate 400 and the web 300 are connected by bolts, and one U-shaped plate 400 can connect multiple webs 300, in this embodiment, the U-shaped plate 400 is connected to three webs 300 at the same time, one is set vertically, and the two are installed obliquely, and it is ensured that the axes of all the webs 300 connected to the same U-shaped plate 400 meet at one point .

Finally, the connecting pipe 420 pre-applies compressive stress by tightening the lower chords 200 on the left and right sides, so as to meet the requirements of the building's bearing capacity.

Preferably, as shown in Figure 4, in order to facilitate the installation of workers and reduce the amount of welding, bolt holes 430 are provided on both sides of the U-shaped plate 400 in this embodiment, and the positions corresponding to the ends of the web bars 300 are also provided with Bolt hole 430, when installing, align the web bar 300 with the bolt hole 430, insert the bolt and lock and fix it. Furthermore, since the installation angle of the web bar 300 can be vertical or inclined, the bolt holes 430 in this embodiment are arranged in two types: vertical distribution and oblique distribution according to the inclination angle of the web bar 300 .

Preferably, since the steel roof truss is an important component of the house and is the main frame of the house, in order to ensure its safety and reliability should be guaranteed, the U-shaped plate 400 in this embodiment is made of steel plates.

Further, in order to prevent the web 300 from swinging left and right or deviate from the originally set angle of inclination under stress, grooves 440 for fixing the web 300 are provided on opposite sides of the U-shaped plate 400 in this embodiment. The groove 440 is arranged on the inner wall of the U-shaped plate 400, and extends vertically downward from the upper end of the U-shaped plate 400, and the web bar 300 is inserted into the corresponding groove 440, and the groove 440 has a limit and position for the web bar 300 function, and finally the bolts are locked and fixed.

To sum up, the utility model sets U-shaped plate 400 on the node of the lower chord 200, and applies appropriate reverse stress to the lower chord 200 through the connecting pipe 420 on the U-shaped plate 400, so that the lower chord 200 can maintain the original Under the premise of bearing capacity, the effective use of materials and the reduction of cross-section size not only reduce its own weight, but also reduce production costs. The stress situation of the lower chord 200 of the existing steel roof truss is well improved, and the section size of the lower chord 200 is effectively reduced while ensuring the safety of the house.

It should be understood that the application of the present utility model is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, for example, the common/usual replacement of each component in the present utility model, etc. , all these improvements and transformations should belong to the scope of protection of the appended claims of the present utility model.

Claims (5)

1. the structure of Shi Hanzhang on steel roof truss, it is characterised in that include winding up Bar, lower boom, the web member being arranged between top boom and lower boom and be arranged on lower boom U-shaped plate with web member junction；Connected by U-shaped plate between described lower boom, U-shaped plate with Lower boom is threaded；One end of described web member is fixing with top boom to be connected, and the other end is fixed on On U-shaped plate；The bottom of described U-shaped plate is provided with two loop pipes, described loop pipe and U-shaped plate It is wholely set；An activity, tapped connecting tube it is provided with between loop pipe；Described lower edge The end of bar is provided with external screw thread, and lower boom inserts loop pipe from U-shaped plate two ends, and is connected Pipe is threaded connection；By be rotationally connected pipe make two lower booms in left and right simultaneously near or simultaneously Separately.

The structure of Shi Hanzhang on steel roof truss the most according to claim 1, it is special Levying and be, the both sides of described U-shaped plate are provided with bolt hole, and web member is fixed with U-shaped plate by bolt Connect.

The structure of Shi Hanzhang on steel roof truss the most according to claim 1, it is special Levying and be, described web member and top boom are by being welded and fixed.

The structure of Shi Hanzhang on steel roof truss the most according to claim 1, it is special Levying and be, described U-shaped plate is made up of steel plate.

The structure of Shi Hanzhang on steel roof truss the most according to claim 1, it is special Levying and be, the both sides that described U-shaped plate is relative are provided with the groove of fixing web member；Described groove sets Putting on the inwall of U-shaped plate, extend straight down from upper end, described web member is fastened in groove.