CN2147260Y

CN2147260Y - Height adjustable steel bearings

Info

Publication number: CN2147260Y
Application number: CN 93203144
Authority: CN
Inventors: 黄茂忠
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-18
Filing date: 1993-02-18
Publication date: 1993-11-24
Anticipated expiration: 2003-02-18

Abstract

Disclosed is a steel support base for force measurement whose height can be adjusted belonging to the building type of the bridge and the viaduct. The steel support base of the utility model designed by adopting the method that hydraulic pressure mode is adopted for push elevation and an inclined padding block is adopted for adjusting the marked height and force transmission can accurately and conveniently enable the support surface to obtain the required design marked height. The support reaction can be measured by an oil pressure gauge. The problem of support reaction measurement and the problem of the marked height adjustment of the support surface difficulty to be solved by the support base whose height can not be adjusted are solved. If the utility model is applied to the simple support beam supported by four support bases, the phenomena of the stress disproportionation of the support bases and even one support base is suspended can be eliminated. The utility model can also be applied to the indeterminate structure is order to adjust the reasonable distribution of the structure internal force and eliminate the internal force redistribution caused by the subsidence of the support base.

Description

Height adjustable steel bearings

The utility model is that a kind of oneself height is adjustable and can measure the novel steel support of bearing reaction, and what belong to bridge and viaduct builds class (E01D19/04).

The steel support that uses in the present bridge, the height of himself is nonadjustable, making the bearing end face is that the absolute altitude of bearing surface reaches designing requirement, the way of using is earlier beam to be jack-uped, then at bridge pier pier cap end face bearing place filling dry mortar, the shortcoming of this method is to be difficult to make the absolute altitude of bearing surface to reach design load exactly, and constructional difficulties, bearing reaction is much does not know yet, this the phenomenon of bearing unbalance stress can occur for the simply supported beam that has four bearings to support simultaneously, can cause a bearing to come to nothing when serious, influence the normal use of structure, in statically-indeterminate structure, when not meeting design load, can cause the absolute altitude of bearing surface actual internal force different with design internal force, influence the safety of structure.

But the way design height-adjustable supports of human bolt jacking was also arranged in the past, and the shortcoming of the method is that top lift is little, complex structure, and therefore cost height, and screw thread can corrosion take place and be difficult to regulate fails practicality.

The purpose of this utility model is to overcome above-mentioned shortcoming, provide a kind of simple in structure, can make things convenient for the novel steel support of adjusting the bearing surface absolute altitude exactly, and can measure bearing reaction, can be applicable to the simply supported beam of four bearing supports and the internal force adjustment of statically-indeterminate structure etc.

Introduce working method of the present utility model below in conjunction with accompanying drawing.

Fig. 1 is the structure chart of heightening part that the bearing of 2 taper liner pieces is arranged.

Fig. 2 is the sectional drawing in II among Fig. 1-II cross section.

Fig. 3 is the structure chart of heightening part that the bearing of 4 taper liner pieces is arranged.

Fig. 4 is the sectional drawing in IV among Fig. 3-IV cross section.

The technical solution adopted in the utility model is to utilize the hydraulic way jacking, and the taper liner piece props up Hold, after oil pump was removed, load P passed to taper liner piece (3) by piston (1), passed to base (8) again, had solved the problem that piston sinks because of leakage of oil under load P long duration of action. Fig. 1 only illustrates the structure of the jacking part of bearing, and the end face of piston can be designed to corresponding shape such as cambered surface etc. by the difference requirement of fixed-hinged support or moveable hinge bearing, and the remainder of bearing can adopt existing bearing to construct accordingly. When the bearing-surface absolute altitude need to be gone up timing, send oil from oil-in (6) toward oil cylinder (2) earlier, piston top is risen to be needed to tighten antidetonation bolt (4) behind the absolute altitude, removes then oil pump; In the time will reducing the bearing-surface absolute altitude, send earlier oil with piston jack-up from oil-in toward oil cylinder, unclamp the antidetonation bolt, mobile taper liner piece falls on the taper liner piece piston by oil return opening (5) emptying to the appropriate location then outward, tightens the antidetonation bolt again. The effect of antidetonation bolt is to prevent that the taper liner piece is owing to the bearing vibrations take place to become flexible, as long as the coefficient of friction f of the upper and lower contact-making surface of the inclination angle A of the contact-making surface of piston and taper liner piece and taper liner piece satisfies relational expression:

(1-cosA)/during sinA＜f, the position of taper liner piece just can self-locking, and can not be extruded, so the horizontal component that produces when bearing load does not act on the taper liner piece of antidetonation bolt. The coefficient of friction f of metal surface is between 0.15～0.25, and when f was 0.15, the angle A of relational expression was 17 degree to the maximum above satisfying, and when then the taper liner piece moved 1 centimetre inward or outward, the bearing-surface absolute altitude raise or reduces by 0.3 centimetre. When the amount that need to adjust when the bearing-surface absolute altitude is big, can change suitable supporting taper liner piece.

When need measuring bearing reaction, load onto oil pressure gauge at dynamometry mouth (7), with oil pressure gauge read the pressure area that multiply by oil cylinder just be bearing reaction.

The taper liner piece adopts 2 among Fig. 1, also can with among polylith such as Fig. 3 with 4, can prevent that the taper liner piece from taking place to become flexible this moment with jackscrew (9), employing polylith taper liner piece can improve the supporting force of bearing under the situation that does not strengthen the base top surface size.

The utility model also can be used to test the shearing impact coefficient of beam-ends, and method is to read the maximum oil pressure under the dynamic load and the oil pressure of static load respectively from oil pressure gauge, and its ratio just for the impact coefficient that bearing was hit, also is beam-ends shearing impact coefficient.

The utility model has solved existing bearing itself can not regulate height and problem that can not dynamometry, and it also has following advantage except making bearing surface exactly and reach design elevation and measuring the bearing reaction:

1, absolute altitude is easy to adjust, can adjust the absolute altitude of bearing surface as required at any time.

2, bearing itself combines the function of Hydraulic for lifting load, and in the design of bridge pier, pier cap can not reserved the position of jack, thereby has reduced the size of pier cap.

3, simple in structure, high efficiency.

Claims

1, a kind of adjustable for height survey counter-force steel support, comprise that piston (1), oil cylinder (2), taper liner piece (3) and antidetonation bolt (4) or jackscrew (9) form, it is characterized in that the combination of hydraulic way jacking with the supporting of taper liner piece, piston (1) and taper liner piece (3) have the inclined-plane that is in contact with one another to regulate the height of bearing, and antidetonation bolt (4) or jackscrew (9) are by the fixed-site of the preformed hole on taper liner piece or the base with the taper liner piece.