CN202241574U

CN202241574U - Movable steel pedestal

Info

Publication number: CN202241574U
Application number: CN2011202905005U
Authority: CN
Inventors: 叶水标; 胡兵良; 金凯; 邵德良; 洪祥水; 范厚彬; 丁祝良; 宋智鹏
Original assignee: Zhejiang Provincial Transporation Eningeering & Construction Group Co Ltd; Zhejiang Jinzhu Transportation Construction Co Ltd
Current assignee: Zhejiang Provincial Transporation Eningeering & Construction Group Co Ltd; Zhejiang Jinzhu Transportation Construction Co Ltd
Priority date: 2011-08-11
Filing date: 2011-08-11
Publication date: 2012-05-30
Anticipated expiration: 2021-08-11

Abstract

The utility model relates to a movable steel pedestal, which comprises two sections of movable sections, a section of fixed section and two sections of movable steel plate sections, wherein the fixed section is cushioned in the center of a bottom face of a pseudo-precast prestressed beam and is fixedly connected with a cushion layer embedded part; the movable sections are cushioned on the two ends of the bottom face of the pseudo-precast prestressed beam and are arranged in a groove formed by embedded angle steel corresponding to two notches; the angle pad of the embedded angle steel is used for adjusting elevated wedge-shaped cushion blocks on the top parts of the movable sections; the movable steel plate sections are arranged between the movable sections and the fixed section; and a drawable ladder-shaped cushion block is cushioned in a gap between each movable steel plate section and a concrete cushion layer. The technical problems that: the bottom face of the end part of the traditional precast prestressed beam is easy to produce crevasse in a tension process, the quality cannot be ensured, the pedestal is easy to squash, and the like, are solved. The movable steel pedestal can be widely applied to the precast prestressed beam.

Description

Movable steel pedestal

Technical field

The utility model relates to a kind of steel pedestal of precast prestressed beam.

Background technology

The in-situ precast prestressed concrete beam is a way commonly used in the science of bridge building; Traditional way is that pedestal is as a whole, is arranged on to intend under the precast prestressed beam, and this way exists precast beam in stretching process; Because the stretch-draw effect causes whole steel pedestal end face to bear big pressure; There is bigger tension in precast prestressed beam end concrete bottom, and can't discharge slippage and decrement owing to bottom pedestal overall fixed, causes the pedestal end by conquassation; And precast prestressed beam head bottom part concrete produces the drawback in vertical crack, and the quality of precast prestressed beam can't guarantee.

The utility model content

The purpose of the utility model provides a kind of movable steel pedestal, solve traditional precast prestressed beam and be easy to generate the crack in stretching process medial end portions bottom surface, and quality can't guarantee that pedestal is easily by technical problems such as conquassation.

For realizing above-mentioned purpose, the utility model adopts following technical scheme:

A kind of movable steel pedestal; Pad is embedded with the bed course built-in fitting of outstanding its upper surface on the said concrete cushion between concrete cushion and plan precast prestressed beam, comprise two sections active segments, one section canned paragraph and two sections movable steel plate bands; Wherein, Said canned paragraph pad is fixedly connected with the bed course built-in fitting intending the bottom surface central authorities of precast prestressed beam, and said active segment pad is at the two ends of intending precast prestressed soffit; And be placed in the groove that forms by two relative pre-buried angle steel of notch; And pre-buried angle steel bight pad is used to regulate the high correcting wedge of active segment top mark, and said movable steel plate band is lined with the trapezoidal cushion block that can transfer in the slit between itself and the concrete cushion between active segment and canned paragraph.

Said bed course built-in fitting is I-steel, channel-section steel or square bar.

The spacing of said bed course built-in fitting does not wait at active segment and canned paragraph.

Said pre-buried angle steel length and active segment equal in length.

Said movable steel plate band two sides are welded with the outside frame plate angle steel of notch, and said frame plate slotted-angle shelving is located on the bed course built-in fitting of movable steel plate band both sides.

Compared with prior art the utlity model has following characteristics and beneficial effect:

The utility model is through becoming the two ends activity with original overall fixed pedestal, center fixed, and dismountable movable steel plate band is set; Satisfied in the stretching process; The demand of two ends pedestal free subsidence and inside slippage has been avoided because the precast prestressed beam base failure that stretch-draw causes and the destruction of pedestal have guaranteed construction quality; Improve the construction life-span of pedestal, practiced thrift construction cost.

Through pad wedge shape steel pad in movable steel pedestal bottom surface; The trapezoidal bloom of pad below the movable steel plate band; The top mark height of having guaranteed movable steel pedestal, movable steel plate band and fixing steel pedestal is identical, avoids occurring because the pedestal split causes the irregular constructional deficiency in precast prestressed soffit.

In addition,, in work progress, can have enough to meet the need construction, improve the utilization rate of construction equipment because pedestal comprises that two sections active segments, one section canned paragraph and two sections movable steel plate bands are split type setting.

The utility model can be widely used in the pedestal of precast prestressed beam.

Description of drawings

Below in conjunction with accompanying drawing the utility model is done further detailed explanation.

Fig. 1 is the utility model structural representation.

Fig. 2 is Figure 1A-A cutaway view.

Fig. 3 is the left view of Fig. 1.

Pedestal user mode figure when Fig. 4 is the top girder tensioning.

Reference numeral: 1-concrete cushion, 2-bed course built-in fitting, 3-active segment, 4-canned paragraph, the pre-buried angle steel of 5-, the movable steel plate band of 6-, 7-correcting wedge, 8-intend prefabricated stretch-draw beam, the trapezoidal cushion block of 9-.

The specific embodiment

Embodiment is referring to Fig. 1, Fig. 2 and shown in Figure 3, and a kind of movable steel pedestal fills up between concrete cushion 1 and plan precast prestressed beam 8; Be embedded with the bed course built-in fitting 2 of outstanding its upper surface on the said concrete cushion; It is characterized in that: comprise two sections active segments 3, one section canned paragraph 4 and two sections movable steel plate bands 6, wherein, said canned paragraph 4 pads are being intended the bottom surface central authorities of precast prestressed beam 8; Be fixedly connected with bed course built-in fitting 2; Said active segment 3 fills up at the two ends of intending precast prestressed beam 8 bottom surfaces, and is placed in the groove that is formed by two relative pre-buried angle steel 5 of notch, and pre-buried angle steel 5 bight pads are used to regulate the high correcting wedge 7 of active segment 3 top marks; Said movable steel plate band 6 is lined with the trapezoidal cushion block 9 that can transfer in the slit between itself and the concrete cushion 1 between active segment 3 and canned paragraph 4.

Said bed course built-in fitting 2 is I-steel, channel-section steel or square bar.

The spacing of said bed course built-in fitting 2 does not wait at active segment 3 and canned paragraph 4.

Said pre-buried angle steel 5 length and active segment equal in length.

Said movable steel plate band 6 two sides are welded with the outside frame plate angle steel 10 of notch, and said frame plate angle steel 10 is erected on the bed course built-in fitting 2 of movable steel plate band both sides.

Above-mentioned movable steel pedestal construction procedure in actual use is following:

Step 1, steel pedestal blinding concrete are built simultaneously at the pre-buried bed course built-in fitting of upper surface: foundation bearing capacity, blinding concrete intensity and physical dimension, absolute altitude, the setting of bed course built-in fitting should meet job specfication and related request with welding.

Step 2, calculating applies pedestal slippage in the prestressing force process according to formula, settling amount calculates.

Wherein, steel pedestal settling amount computing formula:

End settling amount (mm) during C in the formula-arch camber;

H-beam slab camber (mm);

L-precast beam length (mm);

L1-end pedestal length (mm).

Steel pedestal slippage computing formula:

Figure 2011202905005100002DEST_PATH_IMAGE002

L2-slippage in the formula (mm);

H-beam slab camber (mm);

L-precast beam length (mm).

Step 3 installs and fixes pedestal in plan centre position, precast beam bottom surface, and itself and the welding of bed course built-in fitting is fixing.

Step 4; Setting of movable steel pedestal built-in fitting and welding: intend installation traveling table seat at the two ends of intending the precast beam bottom surface and put the bottom, two sides; One of 50mm * 50mm * 1500mm angle steel respectively is set; And be welded to connect with the bed course built-in fitting, its axis, position, absolute altitude (containing the sedimentation value) should adhere to specification.

Step 5; Two pre-buried angle steel (on paste that two-layer 5cm is wide, the thick double faced adhesive tape of 2.5mm; Require smooth-going and no wrinkle, and at two pre-buried angle steel) installation activity steel pedestal in the groove that forms, and it is concordant with fixed base top mark height to adjust its top mark height through the wedge shape steel pad of plug under its bottom surface;

Step 6 is put into movable steel pedestal and the fixing slit between the steel pedestal with the movable steel plate in suspender belt place, and in its bottom with the movable steel pedestal of the top mark height of the movable steel plate in wedge shape steel pad adjustment suspender belt place and both sides with fixedly the steel pedestal is concordant;

Step 7 is referring to Fig. 4; Begin the construction of precast prestressed T beam; Remove wedge shape steel pad and suspender belt place activity strip before the stretch-draw; Arch camber in the middle of prefabricated T beam during the precast prestressed T beam of stretch-draw; The movable steel pedestal at its two ends is under pressure and discharges owing to having removed wedge shape steel pad, and trend that it inwardly slides can freely inwardly be slided owing to removed suspender belt place activity strip, makes the tension between the movable steel pedestal end face and T beam end concrete bottom when the elder sister maintains bigger bearing area and eliminated stretch-draw eventually between movable steel pedestal end face and the T beam end concrete bottom.Guaranteed that precast prestressed T beam its head bottom part concrete in stretching process does not produce vertical crack.

Claims

1. movable steel pedestal; Pad is between concrete cushion (1) and plan precast prestressed beam (8); Be embedded with the bed course built-in fitting (2) of outstanding its upper surface on the said concrete cushion; It is characterized in that: comprise two sections active segments (3), one section canned paragraph (4) and two sections movable steel plate bands (6), wherein, said canned paragraph (4) pad is being intended the bottom surface central authorities of precast prestressed beam (8); Be fixedly connected with bed course built-in fitting (2); Said active segment (3) fills up at the two ends of intending precast prestressed beam (8) bottom surface, and is placed in the groove that is formed by two relative pre-buried angle steel (5) of notch, and pre-buried angle steel (5) bight pad is used to regulate the high correcting wedge (7) of active segment (3) top mark; Said movable steel plate band (6) is positioned between active segment (3) and the canned paragraph (4), is lined with the trapezoidal cushion block (9) that can transfer in the slit between itself and the concrete cushion (1).

2. movable steel pedestal according to claim 1 is characterized in that: said bed course built-in fitting (2) is I-steel, channel-section steel or square bar.

3. movable steel pedestal according to claim 1 is characterized in that: the spacing of said bed course built-in fitting (2) does not wait at active segment (3) and canned paragraph (4).

4. movable steel pedestal according to claim 1 is characterized in that: said pre-buried angle steel (5) length and active segment equal in length.

5. movable steel pedestal according to claim 1 is characterized in that: said movable steel plate band (6) two sides are welded with the outside frame plate angle steel (10) of notch, and said frame plate angle steel (10) is erected on the bed course built-in fitting (2) of movable steel plate band both sides.