CN1034234C - Non-closed arch ring retaining structure and its construction method - Google Patents

Abstract

The present invention relates to a non-closed arch ring retaining structure. The present invention is composed of arch rings and retaining piles, and the arch rings and retaining piles are arranged at the periphery of a foundation pit; two to four filling piles are arranged perpendicularly to an arch ring axial line at the non-closed end of a horizontal parabolic type independent arch ring to form a non-closed end arch foot foundation; the retaining piles are constructed at the boundary of the foundation pit of non-constructed arch rings. A construction method comprises the steps that the non-closed end arch foot foundation is first constructed, the arch rings are constructed in the modes of channel division and segment division, and a closed end arch foot foundation is constructed at the connected part between the arch rings; a ribbon girder is constructed on the upper part of each channel of arch ring; the retaining piles are constructed at the boundary of the foundation pit of the non-closed arch rings. Because structure stress is reasonable, a large quantity of supporting expenses is saved. The present invention is applicable to supporting the foundation pits of underground rooms.

Description

Retaining ring structure and job practices thereof

The invention belongs to the Foundation Design in the building operations, particularly excavate the bank protection soil-baffling structure and the job practices thereof of basement.

In the basement structure construction of construction work, the support retaining method to excavation slope directly affects engineering cost, duration and safety.Generally be to adopt steel sheet pile or reinforced concrete pile retaining soil both at home and abroad, such soil blocking pile is in very disadvantageous vertical cantilever stress, and in order to obtain reliable build-in, about the length of soil blocking pile is twice than foundation depth, even so, excessive displacement still often appears in the soil blocking pile top.

Because earth lateral pressure is uniform in the horizontal direction, be the distributed load that only increases with the degree of depth, there is not point load, this just helps coming a retaining soil pressure with the level arch circle.Arch ring is the structure based on pressurized, can give full play to the high material behavior of concrete crushing strength, and arch ring needn't all add supporting to the full height of hole wall, only needs the suitable height of supporting middle part get final product, and this just makes, and to adopt arch ring retaining soil native much more economical than adopting soil blocking pile and keeping off; Arch ring construction is to cut the earth to intersect synchronously with foundation ditch to carry out, and it is very short to monopolize the duration, and construction speed is fast.

The objective of the invention is " closed arch ring retaining structure and job practices thereof ".(number of patent application: in-depth 92110427.8) and development.Because closed arch ring requires around the foundation ditch construction plant that allows arch camber is arranged, and the highrise building of band basement often is next-door neighbour's road, or in architectural complex near other buildings, therefore, have the situation in arch camber place less around the basement foundation ditch, this has just limited the use model circle of " closed arch ring retaining soil ".In order to bring into play the good characteristic of retaining ring structure, make it in most of basement constructions, to use, need design a kind of " non-closed arch ring retaining structure " and job practices thereof.

Retaining ring structure of the present invention is around foundation ditch, is made up of arch ring and soil blocking pile, and arch ring is 1～4 horizontal parabolic type independence arch ring, is provided with the hoop girt strip at the upper and lower edge and the middle part of buttress; Soil blocking pile is castinplace pile, steel sheet pile, it is characterized in that, horizontal parabolic type independence arch ring and horizontal parabolic type independence arch ring junction, and with the buttress thickening, reinforcement becomes the closing end arch springing foundation; The non-closing end of horizontal parabolic type independence arch ring and soil blocking pile intersection is vertical configuration with the arch ring axis 2～4 castinplace piles is set, and constitutes non-closing end arch springing foundation; On the foundation ditch border of not constructing arch ring, construct soil blocking pile.

The job practices of retaining ring structure of the present invention is:

At the non-closing end of horizontal parabolic type independence arch ring,, construct 2～4 castinplace piles or preformed pile side by side earlier, become non-closing end arch springing foundation perpendicular to the arch ring axis;

Arch ring is along the foundation depth direction, and per 2～3 meters high is one arch ring; With each road arch ring along its length, per 8～10 meters is a construction section; Excavation section by section arch ring foundation trench, arch ring is constructed in segmentation, rise f=commonly used (0.12～0.16) span L of arch ring, in arch ring and arch ring junction, buttress thickening, reinforcement with each 2～3 meters scope about the junction constitute the closing end arch springing foundation;

After one arch ring construction mated, backfill was compacted in the arch ring outer ring, constructs girt strip on arch ring top;

Excavate following one arch ring foundation trench, arch ring is constructed in segmentation;

Between the twice arch ring, construct girt strip;

Like this sequence of construction is constructed down one arch ring and girt strip, until the native degree of depth of the retaining of needs;

On the foundation ditch border of not constructing arch ring, construct soil blocking pile.

The advantage of retaining ring structure of the present invention and job practices thereof is, all do not keep off soil simultaneously around requiring foundation ditch with arch ring, promptly do not require the arch ring closure, the part that basement foundation ditch next-door neighbour road or other buildings is not had the arch camber place, can adopt other soil-baffling structures such as soil blocking pile, and to the part that allows arch camber (on one side, both sides or three limits) native with the arch ring retaining, at this moment foundation ditch is formed the supporting of mixed type soil-baffling structure jointly by other soil-baffling structures such as horizontal arch ring and soil blocking pile independently, such non-closed arch ring retaining structure can be used in most of basement foundation ditch constructions.Ordinary circumstance is, in four limits of foundation ditch, has on one side to change retaining ring structure into by soil blocking pile, can save 15% supporting expense, and the soil blocking pile on both sides changes retaining ring structure into, can save 30% supporting expense.

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is the plan view of retaining ring structure.

Fig. 2 is the arch ring sectional drawing of retaining ring structure.

As seen from the figure, retaining ring structure of the present invention is around foundation ditch, is made up of arch ring and soil blocking pile, and arch ring is 1～4 horizontal parabolic type independence arch ring, is provided with the hoop girt strip at the upper and lower edge and the middle part of buttress; Soil blocking pile is a castinplace pile, it is characterized in that, horizontal parabolic type independence arch ring 1 and horizontal parabolic type independence arch ring 2 junctions, and with the buttress thickening, reinforcement becomes closing end arch springing foundation 3; The non-closing end of horizontal parabolic type independence arch ring and soil blocking pile 5 intersections is vertical configuration with the arch ring axis 2～4 castinplace piles is set, and constitutes non-closing end arch springing foundation 4: on the foundation ditch border of not constructing arch ring, construct soil blocking pile 5.

The job practices of retaining ring structure of the present invention is:

At the non-closing end of horizontal parabolic type independence arch ring, construct 2～4 castinplace piles side by side, become non-closing end arch springing foundation 4;

With arch ring along the foundation depth direction, one arch ring of per 2～3 meters high conducts; With each road arch ring along its length, per 8～10 meters is a construction section, excavation section by section arch ring foundation trench, arch ring is constructed in segmentation, gets rise f=(0.12～0.16) span L of arch ring, in arch ring and arch ring junction, with buttress thickening, reinforcement, constitute closing end arch springing foundation 3;

After one arch ring 6 construction mated, backfill was compacted in the arch ring outer ring, constructs girt strip 7 on arch ring top;

Excavate following one arch ring foundation trench, the second road arch ring 8 is constructed in segmentation;

Between the twice arch ring, construct girt strip 9;

Like this sequence of construction is constructed down one arch ring 10 and girt strip 11, until the native degree of depth of the retaining of needs;

On the foundation ditch border of non-arch ring retaining soil, construct soil blocking pile or other soil-baffling structures 5.

Claims (3)

1, a kind of retaining ring structure is made up of arch ring and soil blocking pile, and arch ring is 1～4 horizontal parabolic type independence arch ring, is provided with the hoop girt strip at the upper and lower edge and the middle part of buttress; Soil blocking pile is castinplace pile, steel sheet pile, it is characterized in that, horizontal parabolic type independence arch ring and horizontal parabolic type independence arch ring junction, and with the buttress thickening, reinforcement becomes the closing end arch springing foundation; The non-closing end of horizontal parabolic type independence arch ring and soil blocking pile intersection is vertical configuration with the arch ring axis 2～4 castinplace piles is set, and constitutes non-closing end arch springing foundation; On the foundation ditch border of not constructing arch ring, construct soil blocking pile.

2, retaining ring structure as claimed in claim 1 is characterized in that, non-closing end arch springing foundation is 2～4 preformed piles.

3, a kind of job practices of retaining ring structure the steps include: the non-closing end at horizontal parabolic type independence arch ring, constructs 2～4 castinplace piles side by side, becomes non-closing end arch springing foundation;

With arch ring along the foundation depth direction, per 2～3 meters high is one arch ring, with each road arch ring along its length, per 8～10 meters is a construction section, excavation section by section arch ring foundation trench, and arch ring is constructed in segmentation, get rise f=(0.12～0.16) span L of arch ring, in arch ring and arch ring junction,, constitute the closing end arch springing foundation with buttress thickening, reinforcement;

After one arch ring construction mates, compacted in the peripheral backfill of arch ring, construct girt strip on arch ring top;

Excavate following one arch ring foundation trench, arch ring is constructed in segmentation;

Between the twice arch ring, construct girt strip;

Like this sequence of construction is constructed down one arch ring and girt strip, until the native degree of depth of the retaining of needs;

On the non-foundation ditch border of constructing arch ring, construct soil blocking pile.

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