CN215166516U - Be used for reinforced (rfd) assembled overcoat steel pipe of rack member - Google Patents

Abstract

The utility model discloses an assembled outer steel pipe for reinforcing a net rack rod piece, in particular to the technical field of net rack rod piece construction assistance, which comprises a net rack rod piece body, wherein an outer steel pipe assembling mechanism is arranged outside the net rack rod piece body; the outer sleeve steel pipe assembling mechanism is composed of an outer sleeve steel pipe, connecting lug plates and connecting flange plates, wherein the outer sleeve steel pipe is divided into two specifications of an end sleeve and a middle sleeve according to different positions, the outer sleeve steel pipe is composed of 4L-shaped steel plates, and two adjacent L-shaped steel plates are connected through the connecting lug plates. The utility model discloses weight is lighter and is bolted connection, and installation and later stage are demolishd conveniently, adopt to turn round the quality management and control of cutting the type bolt of being convenient for, have guaranteed the reliability of connection, can carry out the check calculation by construction unit technical staff after site conditions, transportation condition etc. confirm, carry out local reinforcement to stabilizing the over-limit member of bearing capacity, have avoided the residual stress that the field welding produced.

Description

Be used for reinforced (rfd) assembled overcoat steel pipe of rack member

Technical Field

The utility model relates to a supplementary technical field of rack member construction, more specifically say, the utility model relates to an assembled overcoat steel pipe for rack member is consolidated.

Background

Most of grid structures are in the hoisting stage, because the span is great, are difficult to hoist once and take one's place, need set up interim support for structural boundary condition changes, and the difference is great in structural system and use stage, and partial member is become the depression bar by the pull rod, thereby leads to the less member of specification to stabilize bearing capacity and transfinite.

At present, there are three common processing methods for this problem, the first is: in the design stage, the construction working condition is considered, the section of the over-limit rod piece is enlarged, however, in the stage, because the construction unit is not involved yet, the situations such as site conditions, transportation conditions and the like are not clear, uncertain factors are more, and the situation that the hoisting method adopted by the construction unit is consistent with the situation considered by a designer is difficult to guarantee. And the second method comprises the following steps: the starting rod of the grid structure is increased at the design stage, for example, 3.5m grids are formed, D60X3.5 round steel tubes are selected as the minimum component cross section, the slenderness ratio is 175, the control value of the pressure rod is met, the minimum cross section is changed into D76X4 round steel tubes in consideration of the construction working condition, the number of reinforcing rod pieces at the construction stage can be reduced, the steel consumption of the structure is greatly increased, and the economical efficiency is poor. And the third is that: according to the construction checking calculation result, the overrun rod piece is reinforced by using the outer-wrapped angle steel or channel steel, and the contact surface of the channel steel or the angle steel and a steel pipe is discontinuously welded during construction.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above-mentioned defect of prior art, the embodiment of the utility model provides a be used for reinforced (rfd) assembled outer steel pipe of rack member, through setting up outer steel pipe equipment mechanism, outer steel pipe equipment mechanism weight is lighter and be bolted connection, and the convenience is demolishd in installation and later stage, adopts to turn round the type of cutting bolt quality management and control of being convenient for, has guaranteed the reliability of connection to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: an assembled outer steel pipe for reinforcing a net rack rod piece comprises a net rack rod piece body, wherein an outer steel pipe assembling mechanism is arranged on the outer side of the net rack rod piece body;

the outer sleeve steel pipe assembling mechanism is composed of outer sleeve steel pipes, connecting lug plates and connecting flange plates, wherein the outer sleeve steel pipes are divided into two specifications of end portion sleeves and middle portion sleeves according to different positions, each outer sleeve steel pipe is composed of 4L-shaped steel plates, two adjacent L-shaped steel plates are connected through the connecting lug plates, and two adjacent outer sleeve steel pipes are connected through the connecting flange plates.

In a preferred embodiment, the length of the end sleeve is 990 cm, the length of the middle sleeve is 980 cm, the thickness of the L-shaped steel plate is 10mm, the single-side opening 45-degree groove fusion welding is performed, the size of an inner skin is D/2-2mm, and D is the diameter of the net rack rod piece body.

In a preferred embodiment, the connecting lug plate is set to be 40x50x10mm in size, the middle part of the connecting lug plate is provided with an opening, the hole diameter of the connecting lug plate is set to be 14mm, and the connecting lug plate is welded with a fillet weld of an L-shaped steel plate in a surrounding mode.

In a preferred embodiment, the plate thickness of the connecting flange is set to 10mm, and the connecting flange is welded with an L-shaped steel plate in a surrounding mode.

In a preferred embodiment, after the outer sleeve steel pipe assembling mechanism is welded and formed, the surfaces of the outer sleeve steel pipe assembling mechanism except the friction surface are sprayed with alkyd antirust paint, and the thickness of a paint film is 25-30 micrometers.

The utility model discloses a technological effect and advantage:

1. through setting up overcoat steel pipe equipment mechanism, overcoat steel pipe equipment mechanism weight is lighter and be bolted connection, and the convenience is demolishd in installation and later stage, adopts the quality management and control of being convenient for of turning round the type of cutting bolt, has guaranteed the reliability of connecting.

2. The technical personnel of construction units can carry out checking calculation after site conditions, transportation conditions and the like are determined, local reinforcement is carried out on the stable bearing capacity overrun rod piece, and residual stress generated by site welding is avoided.

3. The stability of transfinite member piece has been improved by a wide margin, can eliminate the member unstability problem, and the casing pipe is demolishd to hoist and mount back of taking one's place, can repeatedly have enough to meet the need the use in other projects, has avoided the material waste, and the economic nature is good.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic view of a partial structure shown in fig. 1A.

Fig. 3 is a schematic view of the structure of the outer steel casing of the present invention.

Fig. 4 is a schematic diagram of the structure of the connection ear plate of the present invention.

Fig. 5 is a schematic view of the connection flange structure of the present invention.

Fig. 6 is a schematic view of a combined cross-sectional structure of a reinforced circular tube D76X4 and a square tube 96X10 in embodiment 1 of the present invention.

The reference signs are: 1. a net rack rod body; 2. sleeving a steel pipe outside; 3. connecting the ear plates; 4. and connecting the flange plates.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1:

the components of the net rack which are easy to be unstable in the hoisting process are generally circular tubes with three specifications of D60X3.5, D76X4 and D89X4.0, the length of each rod piece is generally 3 m-5 m, and a rod piece with the specification of D76X4 and the length of L =4m is taken at present, the stable bearing capacity before and after the rod piece is reinforced is analyzed, and the increase coefficient of the stable bearing capacity of the rod piece after the rod piece is reinforced is obtained.

Firstly, the characteristic of a cross section is checked, the cross section before reinforcing is a D76X4 round tube, and the axial inertia moment

=63.593cm4, cross-sectional area a1=6.793cm2, radius of gyration

。

If the calculated length factor is taken to be 1.0, the slenderness ratio λ 1= L-

=4000/30.59=130.76

Looking at appendix D of Steel Structure design Standard, the stability factor ∅ 1= 0.383.

Then the device is used for reinforcing the steel plate, and the concrete steps are as follows:

firstly, as shown in the attached drawings 1-5, firstly, an outer sleeve steel pipe assembling mechanism is assembled, four outer sleeve steel pipes 2 are connected through a plurality of connecting lug plates 3, then connecting flanges 4 are installed at two ends of a middle sleeve pipe, a connecting flange 4 is installed at one end of an end sleeve pipe, the lengths of the assembled middle sleeve pipe and the assembled end sleeve pipe reach 1 meter, at the moment, the middle sleeve pipe and the end sleeve pipe are connected through the connecting flanges 4, the outer sleeve steel pipe assembling mechanism is assembled, and in the process of installation, a joint is firstly fixed by temporary bolts, and the number of the bolts is more than 1/3 of the total number of joint bolts; the high-strength bolt is freely inserted into a hole and cannot be knocked forcibly when being installed, a washer of the torsional shear type high-strength bolt is arranged on one side of a nut, one side of the washer hole with a chamfer angle is in contact with the nut and cannot be reversely installed, the high-strength bolt must be fastened twice, the first time is initial screwing, the high-strength bolt is fastened to 60% -80% of the standard axial force (namely the design pretensioning force) of the bolt, and the torque value of the initial screwing is not less than 30% of the torque value of the final screwing. The second fastening is final screwing, the plum blossom clamps of the torsional shear type high-strength bolts are screwed off during final screwing, and initial screwing and final screwing are carried out in a certain sequence in order to enable all the bolts in the bolt group to be uniformly stressed;

secondly, the net rack rod body 1 (i.e. the D76X4 round tube in this embodiment 1) to be reinforced is passed through the sleeve composed of the outer steel tube assembly mechanism, and then is installed, and after the installation, the stable bearing capacity is analyzed.

The reinforced section is a combined section of a D76X4 round tube and a 96X10 square tube, and is shown in figure 6.

Moment of inertia of symmetric axis of square tube section

= 429.77 cm4, cross-sectional area a2=34.4cm2, the moment of inertia of the combined cross-section

Radius of gyration

34.62mm

Slenderness ratio λ 2= L-

=4000/34.62=115.54

Looking at appendix D, the stability factor ∅ 2=0.464

In steel structure design Standard 7.2.1, the stable stress calculation formula of the axial center compression member is as follows:

before the rod piece is reinforced;

after the rod piece is reinforced;

stable bearing capacity increasing coefficient gamma =

。

The D60X3.5 and D89X4.0 circular tubes are calculated before and after being reinforced by the same method, and the stable bearing capacity increasing coefficients are respectively 6.83 and 5.56, which shows that the reinforcement measure can greatly improve the stable bearing capacity of the rod piece, and the stability of the rod piece does not need to be considered when the strength of the rod piece meets the requirement of the bearing capacity.

The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;

secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are referred to, and other structures can refer to the common design, and under the condition of no conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

and finally: the above description is only for the preferred embodiment of the present invention and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a be used for reinforced (rfd) assembled overcoat steel pipe of rack member, includes rack member body (1), its characterized in that: an outer sleeve steel pipe assembling mechanism is arranged on the outer side of the net rack rod piece body (1);

the outer sleeve steel pipe assembling mechanism is composed of outer sleeve steel pipes (2), connecting lug plates (3) and connecting flange plates (4), wherein the outer sleeve steel pipes (2) are divided into two specifications of end sleeves and middle sleeves according to different positions, each outer sleeve steel pipe (2) is composed of 4L-shaped steel plates, two adjacent L-shaped steel plates are connected through the connecting lug plates (3), and two adjacent outer sleeve steel pipes (2) are connected through the connecting flange plates (4);

and the bolts used on the connecting lug plate (3) and the connecting flange plate (4) are all set to be torsional shear type high-strength bolts.

2. The fabricated steel jacketed pipe for grid member reinforcement of claim 1, wherein: the length of the end sleeve is set to 990 cm, the length of the middle sleeve is set to 980 cm, the plate thickness of the L-shaped steel plate is set to 10mm, the unilateral opening 45-degree groove fusion welding is carried out, and the endothelial dimension is D/2-2mm, wherein D is the diameter of the net rack rod piece body (1).

3. The fabricated steel jacketed pipe for grid member reinforcement of claim 1, wherein: the connecting lug plate (3) is arranged to be 40x50x10mm in size, the middle of the connecting lug plate is provided with a hole, the hole diameter is 14mm, and the connecting lug plate and an L-shaped steel plate are welded in a circumferential welding mode.

4. The fabricated steel jacketed pipe for grid member reinforcement of claim 1, wherein: the thickness of the connecting flange plate (4) is set to be 10mm, and the connecting flange plate is welded with the L-shaped steel plate in a surrounding mode.

5. The fabricated steel jacketed pipe for grid member reinforcement of claim 1, wherein: after the outer sleeve steel pipe assembling mechanism is welded and formed, the alkyd antirust paint is sprayed on the surface of the outer sleeve steel pipe assembling mechanism except for the friction surface, and the thickness of a paint film is 25-30 micrometers.

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