CN208517942U - A kind of trestle increases the trestle girder connection of section and trestle angled transition section - Google Patents

Abstract

The utility model relates to the trestle girder connections that a kind of trestle of foundation pit trestle bridge system increases section and trestle angled transition section.Technical solution are as follows: the first trestle beam is located at the lower part that trestle increases section trestle plate or trestle angled transition section trestle plate, second trestle beam is located at the lower part of trestle horizontal segment trestle plate, the back absolute altitude of first trestle beam is higher than the back absolute altitude of the second trestle beam, reduces the top cross section of the first trestle beam；Absolute altitude at the cross-sectional width variation of first trestle beam is that the top mark of the second trestle beam is high；The upper end of the upper reinforcement of first trestle beam anchors into trestle and increases in section trestle plate or trestle angled transition section trestle plate, and lower end anchors into the lower part of the first trestle beam, and the cross-sectional width and arrangement of reinforcement of the lower part of the first trestle beam are the same as the second trestle beam.It is by optimization trestle beam section and arrangement of reinforcement, thus effectively reduce inside and outside place height difference due to increased trestle bridge system Beam-Slab Construction project amount.

Description

A kind of trestle increases the trestle girder connection of section and trestle angled transition section

Technical field

The utility model relates to a kind of architecture Foundation Pit Engineering fields, in particular to a kind of trestle section of foundation pit trestle bridge system Point.

Background technique

Currently, with the rapid development of society, the scale that Urban Underground Space Excavation utilizes is increasing, and density is also more next Bigger, this just proposes more strict requirements to the design of base pit engineering and construction.In recent years, with base pit engineering toward it is deep, Greatly, engineering geological condition complexity, complicated hydrogeological conditions, environmental condition complexity direction are constantly broken through, and are set in base pit engineering Some important engineering experiences are had accumulated in meter, construction, in base pit engineering limited on construction ground, usually combine the The setting of one of reinforced concrete support, adds trestle bridge system, facilitates earth excavation and transport, to accelerate foundation pit construction speed Degree reduces influence of the excavation of foundation pit to surrounding enviroment.

And the trestle bridge system used now is lightered generally according to the earthwork in place entrance, be unearthed route and hole, is applied Situations such as work vehicle load ability, in conjunction with the Deepen Design that earth excavation tile and hierarchy technical requirements are carried out with trestle bridge system.By Usually different from peripheral path site elevation in support trestle top mark height, the top surface absolute altitude of foundation pit trestle bridge system is generally divided into three Kind, the first is the trestle horizontal segment high using the universal top mark of trestle in place, is and place entrance absolute altitude for second The trestle flushed increases section, the third trestle angled transition section between above-mentioned first and second kind of trestle absolute altitude.Under normal circumstances, For the universal top mark height of trestle in periphery site elevation, trestle increases the design of section and trestle angled transition section in base pit engineering place It constructs frequently with the way for directly increasing thickening beam slab.However, this way makes under trestle when height difference is larger inside and outside place Column, stand column pile loading increase, and part needs additional progress reinforcement and strengthening.Meanwhile the whole width of trestle beam increases the way of thickening, it is whole Body volume is big, and armored concrete dosage is more, but foundation pit trestle bridge system is only used for the Underground Construction stage, and the later period need to tear open It removes, engineering cost is higher, and wastes material to a certain extent, is unsatisfactory for energy-saving and environment-friendly requirement.

Utility model content

It is stood caused by integrally increasing for the trestle beam that trestle in foundation pit trestle bridge system increases section and trestle angled transition section The problems such as column, stand column pile loading increase, construction material waste, the utility model provides a kind of trestle that can reduce self weight and increases section With the trestle girder connection of trestle angled transition section, by optimize trestle increase section and trestle angled transition section trestle beam section and Arrangement of reinforcement alleviates trestle and adds to effectively reduce increased trestle bridge system Beam-Slab Construction project amount due to the height difference inside and outside place The load of the trestle beam lower pillar stand of high section and trestle angled transition section, stand column pile, so that engineering cost has effectively been saved, structure Safe and reasonable is constructed, the degree of safety of trestle bridge system is remarkably improved.

The technical solution of the utility model are as follows: the first trestle beam is located at trestle and increases section trestle plate or trestle angled transition section The lower part of trestle plate, the second trestle beam are located at the lower part of trestle horizontal segment trestle plate, and the back absolute altitude of the first trestle beam is high In the back absolute altitude of the second trestle beam, the top cross section of the first trestle beam is reduced, the first trestle beam is made Top cross-sectional width is less than the lower cross section width of the first trestle beam；The cross-sectional width of the first trestle beam becomes Absolute altitude at change is that the top mark of the second trestle beam is high；The upper end of the upper reinforcement of the first trestle beam anchors into the trestle To increase in section trestle plate or the trestle angled transition section trestle plate, lower end anchors into the lower part of the first trestle beam, and first The cross-sectional width and arrangement of reinforcement of the lower part of trestle beam are the same as the second trestle beam.

There are the feelings of height difference with project periphery site elevation mainly for the universal top mark height of trestle in place for the utility model Condition reduces the partial cross section that trestle in the prior art increases the first trestle beam of section and trestle angled transition section, under small in formation Big non-uniform beam.

In Practical Project, the deck-siding and arrangement of reinforcement on the top of the first trestle beam carry out shearing resistance according to upper load, bending resistance checks Design, it is proposed that deck-siding is not preferably less than 300mm；The upper end of the upper reinforcement of first trestle beam anchors into trestle and increases section trestle plate or a stack In bridge angled transition section trestle plate, lower end is anchored into the lower part of the first trestle beam, and anchorage length should meet concerned countries rule Model requirement.

The utility model has the beneficial effects that: the utility model under the premise of guaranteeing shearing resistance bending resistance equal safety degree, contracts Small trestle in the prior art increases the partial cross section of the first trestle beam of section and trestle angled transition section, forms up-small and down-big change It cuts section bar.This design increased trestle Beam-Slab Construction project amount due to not only effectively reduce inside and outside place height difference, reduces Trestle increases the load of section and trestle angled transition section lower pillar stand, stand column pile, avoids that trestle increases section and trestle is tilted over The reinforcement and strengthening design for crossing a section lower pillar stand, stand column pile, can greatly save engineering cost, improve the safety of entire trestle support system Degree has good promotion prospect.

Detailed description of the invention

Fig. 1 is the trestle bridge system structure section schematic diagram of the utility model embodiment.

Fig. 2 is the organigram that trestle increases section node.

Fig. 3 is the organigram of trestle angled transition section node.

Specific embodiment

For better understanding of the above-mentioned technical proposal of the utility model, carried out with reference to the accompanying drawings and examples into one Step ground detailed description.

As shown in Figure 1, the top surface absolute altitude of foundation pit trestle bridge system is generally divided into three kinds, the first is general using trestle in place All over the high trestle horizontal segment of top mark, second is that the trestle flushed with place entrance absolute altitude increases section, the third is upper State the trestle angled transition section between first and second kind of trestle absolute altitude.First trestle beam 603 be located at trestle increase section trestle plate 601 or The lower part of trestle angled transition section trestle plate 602, the second trestle beam 503 are located at the lower part of trestle horizontal segment trestle plate 502, and first The back absolute altitude of trestle beam 603 is higher than the back absolute altitude of the second trestle beam 503, the first trestle beam 603 and the second trestle beam 503 Lower part is support post 401.

As shown in Fig. 2, reducing 605 cross section of top of the first trestle beam, keep 605 cross section of top of the first trestle beam wide Degree is less than 606 cross-sectional width of lower part of the first trestle beam.As shown in Figure 1, the cross-sectional width of the first trestle beam changes The absolute altitude at place is that the top mark of the second trestle beam 503 is high.As shown in Fig. 2, the upper end of the upper reinforcement 607 of the first trestle beam anchors into stack Bridge is increased in section trestle plate 601, and lower end anchors into the lower part 606 of the first trestle beam, and the lower part 606 of the first trestle beam is cut Face width and arrangement of reinforcement are the same as the second trestle beam 503.

As shown in figure 3, being the connection schematic diagram of the first trestle beam and trestle angled transition section trestle plate 602, construction is same First trestle beam and trestle increase a section construction for trestle plate 601.

In the utility model, the related load design of trestle beam, sectional reinforcement can be set according to existing national concrete structure Meter specification etc. determines.

Those of ordinary skill in the art it should be appreciated that more than embodiment be intended merely to illustrate that this is practical new The technical solution of type, and being not used as the restriction to the utility model, it is any based on the connotation of the utility model to Variation made by the upper embodiment, deformation, will all fall in the protection scope of the claims of the present utility model.

Claims (2)

1. a kind of trestle increases the trestle girder connection of section and trestle angled transition section, the first trestle beam (603) is increased positioned at trestle The lower part of section trestle plate (601) or trestle angled transition section trestle plate (602), the second trestle beam (503) are located at trestle horizontal segment The lower part of trestle plate (502), the back absolute altitude of the first trestle beam (603) are higher than the back of the second trestle beam (503) Absolute altitude, which is characterized in that top (605) cross section for reducing the first trestle beam (603) makes the upper of the first trestle beam Portion's (605) cross-sectional width is less than lower part (606) cross-sectional width of the first trestle beam；The first trestle beam it is transversal Absolute altitude at the change width of face is that the top mark of the second trestle beam (503) is high；The upper reinforcement (607) of the first trestle beam Upper end anchor into the trestle and increase in section trestle plate (601) or the trestle angled transition section trestle plate (602), lower end anchors into In the lower part (606) of the first trestle beam, the cross-sectional width and arrangement of reinforcement of the lower part (606) of the first trestle beam are the same as described the Two trestle beams (503).

2. a kind of trestle according to claim 1 increases the trestle girder connection of section and trestle angled transition section, feature exists Cross-sectional width in the top (605) of the first trestle beam is not less than 300 millimeters.