A kind of pattern foundation pit supporting structure stack inner supporting structure
The present invention relates to technical field of civil engineering, particularly the pattern foundation pit supporting structure inner supporting structure.
In foundation pit supporting construction, inner support supporting and protection structure supports for commonly used, mainly contains reinforced concrete support and steel and supports.Existing steel inner support is generally steel pipe support and type steel support, its specification changes less, and when running into the larger deep foundation ditch of soil pressure, the steel of model commonly used supports, bearing capacity is limited, so must seek the requirement that a kind of braced structures safe and reliable and reasonable price reaches bearing capacity.
Summary of the invention
Technical problem to be solved by this invention is, overcomes the little problem of inner support bearing capacity in the existing pattern foundation pit supporting structure, and a kind of pattern foundation pit supporting structure stack inner supporting structure is provided.
In order to address the above problem, technical scheme of the present invention is such:
A kind of pattern foundation pit supporting structure superposing type inner supporting structure, be provided with in the foundation ditch and enclose purlin, multiple tracks is enclosed purlin and is connected with the multiple tracks type steel support, it is characterized in that, at least one type steel support is the superposing type structure, the edge of a wing face of two-layer H shaped steel and shaped steel is parallel to each other about being distributed with on the described superposing type structural section, is interconnected to form inner supporting structure one between the two-layer H shaped steel.
Connect by the another H shaped steel that intersects between the described two-layer H shaped steel, the top flange face of the bottom flange face of the edge of a wing face of described another H shaped steel and upper strata H shaped steel and lower floor's shaped steel is fitted.
Described another H shaped steel connects upper strata H shaped steel and the H of lower floor shaped steel by dismountable bolt.
Be connected with dismountable bolt between the described two-layer H shaped steel.
Be provided with in foundation ditch for the column that supports type steel support, column is provided with bearing plate in support place of every stratotype steel, and bearing plate is positioned at the soffit place of H type steel support, and at the H of superposing type structure type steel support place, bearing plate is positioned at the soffit place of the H of lower floor shaped steel.
Spacing between the two-layer shaped steel is≤4m.
The purlin that encloses of foundation pit side-wall is that fish belly sill encloses purlin, and fish belly sill comprises, lower-cord beam, web member and the muscle that winds up; Lower-cord beam is straight, and the muscle that winds up is arc, and two ends of lower-cord beam and the muscle that winds up join, the web member lower end is fixed on the lower-cord beam, and the upper end contacts with the muscle that winds up, and forms a fish belly shape structure, the muscle that winds up is applied with prestressing force, and the joint of lower-cord beam and the muscle that is connected connects the end of type steel support.
Beneficial effect, pattern foundation pit supporting structure of the present invention superposing type inner supporting structure has satisfied the requirement that different depth soil layer pressure changes, and improves stability of strutting system, reduces and supports the road number, enlarges the foundation ditch inner space, and fortune and underground main structure construction are dug in the convenient earthwork; Reach the reduction of erection time, reduced the purpose of construction costs
Description of drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is pattern foundation pit supporting structure of the present invention superposing type inner support syndeton schematic diagram.
Fig. 2 is inner support cross section structure schematic diagram of the present invention.
The specific embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
Referring to Fig. 1, foundation ditch adopts inner supporting structure in the present embodiment, inner support is steel structure girder 1, steel structure girder 1 two end supports is being enclosed on the purlin, steel structure girder 1 is made of side by side many shaped steel, be that eight shaped steel support side by side in the present embodiment, eight shaped steel laterally interfix by junction plate, vertically are bolted to reach the length extension.The shaped steel radical that steel structure girder 1 includes is chosen according to the actual loading situation.
Referring to Fig. 2, on the longitudinal cross-section of foundation ditch, the inner support of foundation ditch is three roads, and it is the support of one deck formed steel construction that first supports 11, and the end that first supports connects by shaped steel 2 encloses purlin.Be provided with an A-frame 3 in the bottom of shaped steel 2, A-frame 3 is used for supporting shaped steel 2 and first supports 11 junction, end.
It is the support of two-layer steel work that second supports 12, and two-layer steel structure support stacks up and down, and the centre is provided with shaped steel and connects.Second supports 12 end and connects by two shaped steel 2 up and down and enclose purlin, also connects by shaped steel between two shaped steel 2 up and down.Bottom at the shaped steel 2 of lower floor is provided with an A-frame 3, and A-frame 3 is used for supporting shaped steel 2 and second supports 12 junction, end.Distance between the two-layer steel work is less than or equal to 4 meters; This distance can change according to actual actual conditions, is generally 30 centimetres to 60 centimetres.
The 3rd road support 13 with second to support 12 structures identical.Perhaps the 3rd road supports the structure that also can adopt first to support.Specifically which road supports the steel work that adopts stack double-deck in a foundation ditch, can change according to the actual loading situation, has reached the purpose of stability under loading.
In foundation ditch, be provided with for the column 5 that supports type steel support, column 5 is provided with bearing plate 51 in support place of every stratotype steel, is provided with the shaped steel crossbeam on the bearing plate 51, bearing plate 51 be positioned at type steel support below, at the type steel support place of superposing type structure, bearing plate 51 be positioned at lower floor's shaped steel below.
The purlin that encloses of foundation pit side-wall is that fish belly sill encloses purlin, and fish belly sill encloses purlin 4 and comprises a lower-cord beam 41, steel strand 42, web member 43.
Its lower-cord beam 41 is assembled by section steel material; Its steel strand 42 are comprised of many high-strength underrelaxation steel hinge lines, adopt the plastic cement pipe box to play and fill with grease protection and isolation between the every steel strand.
Its web member 43 assembles wooden font or yi word pattern by section steel material; Web member 43 arranges on the string beam 41, and the two ends of steel strand 42 connect lower-cord beam 41 two ends, and the middle part of steel strand 42 is supported by web member 43 and is the fish belly shape.
Pattern foundation pit supporting structure of the present invention superposing type inner supporting structure, the advantages such as support stiffness is large, span is large, distortion can control, easy construction, reusing have reached the reduction of erection time, have reduced the purpose of construction costs.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not subjected to the restriction of above-mentioned example; that describes in above-mentioned example and the manual just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.