CN212612501U - Boundary supporting structure for stage construction of foundation pit in soft soil stratum - Google Patents

Abstract

The utility model relates to a boundary supporting construction of foundation ditch stage by stage construction in weak soil stratum. The utility model aims at providing a boundary supporting construction of foundation ditch stage construction in simple structure, construction convenience, lower, the safe and reliable's of cost weak soil stratum. The supporting structure is arranged at a boundary of staged construction in a foundation pit and is provided with a row of concrete mixing pile I and a row of concrete mixing pile II, wherein the row of concrete mixing piles I is arranged at the side, close to the first construction side, of the foundation pit; the concrete mixing pile I row is divided into a plurality of pairs of concrete mixing pile I pairs which are arranged at intervals, the concrete mixing pile II row is layered into a plurality of pairs of concrete mixing pile II pairs, and the concrete mixing pile II pairs are arranged corresponding to gaps between the concrete mixing pile I pairs and the concrete mixing pile I pairs; a steel pipe pile is arranged on the side, close to the foundation pit, of the concrete mixing pile II pair, which is firstly constructed; and crown beams are arranged above the row I of concrete mixing piles and the row II of concrete mixing piles. The utility model is suitable for a building and underground works field.

Description

Boundary supporting structure for stage construction of foundation pit in soft soil stratum

Technical Field

The utility model relates to a boundary supporting construction of foundation ditch stage construction in weak soil stratum is applicable to building and underground works field.

Background

From the beginning of the 80 s of the 20 th century, the information construction method is applied to the first deep foundation pit supporting engineering in the Shenzhen region in China, so that the construction cost is greatly saved. After the 20 th century and the 90 s, more and more construction cases of complex deep foundation pits exist. On one hand, due to the lack of understanding and understanding of the foundation pit supporting technology, some foundation pit engineering accidents are caused, and severe social influence and huge economic loss are caused. On the other hand, our country has more and more high attention on the aspect of deep foundation pit supporting engineering, and the deep foundation pit supporting technology is also listed as the first of 10 new technologies in the notification about further popularization and application of 10 new technologies of the ministry of construction. With the massive emergence of high-rise buildings in urban construction and the full utilization of urban underground space, the deeper and deeper deep foundation pit engineering is, the more and more complex the surrounding environment is, the difficulty of construction is continuously increased, the diversification and complication of foundation pit forms are caused, and the supporting mode of the foundation pit is required to be continuously improved and developed.

In the aspect of engineering application, the regional characteristics of foundation pit support are very obvious. Because the physical and mechanical properties of soil bodies in different regions are greatly different, the experience of mature application in some regions cannot be completely adapted to the conditions of other regions, and simple use is not feasible. In coastal plain areas at Zhejiang, the soil quality mainly comprises soft soil. The soft soil has the characteristics of low strength, high compressibility and high water content, and the foundation pit excavation is carried out in the soft soil foundation, so that the phenomena of larger soil body displacement and instability are easy to generate. Therefore, high requirements are put on the engineering design, construction and deformation control of the foundation pits.

At present, foundation pit boundary support and stage excavation are often required to be carried out for various reasons in foundation pit engineering, the design of the boundary support needs to consider various possible working conditions of the support, and meanwhile, the foundation pit boundary support has both engineering economy and construction convenience.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: aiming at the problems, the boundary supporting structure for the stage construction of the foundation pit in the soft soil stratum is simple in structure, convenient to construct, low in cost, safe and reliable.

The utility model adopts the technical proposal that: the utility model provides a boundary supporting construction of foundation ditch stage by stage construction in soft soil stratum sets up in boundary department of stage construction in the foundation ditch, its characterized in that: the foundation pit construction method comprises the following steps of (1) arranging a row of concrete mixing piles I and a row of concrete mixing piles II which are arranged on the side, close to the foundation pit construction side, of the row of concrete mixing piles I;

the concrete mixing pile I row is divided into a plurality of pairs of concrete mixing pile I pairs which are arranged at intervals, the concrete mixing pile II row is layered into a plurality of pairs of concrete mixing pile II pairs, and the concrete mixing pile II pairs are arranged corresponding to gaps between the concrete mixing pile I pairs and the concrete mixing pile I pairs;

a steel pipe pile is arranged on the side, close to the foundation pit, of the concrete mixing pile II pair, which is firstly constructed;

and crown beams are arranged above the concrete mixing pile I row and the concrete mixing pile II row.

And an arched beam is arranged on the rear construction side of the foundation pit of the concrete mixing pile I, two ends of the arched beam are fixed on foundation pit enclosing structures at two ends of the boundary supporting structure, and the arched beam is connected with the steel pipe pile through a connecting rod.

The connecting rod is connected with the arched beam, and the other end of the connecting rod is connected with the steel pipe pile through a pipe hoop.

And a plurality of reinforcing ribs are formed on the inner wall of the steel pipe pile.

The utility model has the advantages that: the utility model discloses well concrete mixing stake I to with concrete mixing stake II to alternate arrangement to what concrete mixing stake II was right is close to the foundation ditch and is under construction earlier the side and beat and establish the steel-pipe pile, the horizontal pressure that concrete mixing stake I will receive through concrete mixing stake II steel-pipe pile, simple structure, safe and reliable. The utility model discloses well steel-pipe pile lower extreme cartridge is in the soil body, and the peripheral foundation ditch envelope of foundation ditch is connected through connecting rod and arched beam to steel-pipe pile upper end, makes overall structure more firm reliable.

Drawings

Fig. 1 is a schematic plan view of the embodiment.

Fig. 2 is a schematic structural diagram of the embodiment.

1. Concrete mixing pile I; 2. concrete mixing pile II; 3. steel pipe piles; 4. a crown beam; 5. an arched beam; 6. a connecting rod; 7. a foundation pit support structure; 8. and (4) a pipe clamp.

Detailed Description

As shown in fig. 1 and fig. 2, this embodiment is a boundary supporting structure for staged construction of a foundation pit in a soft soil stratum, and is disposed at a boundary of staged construction in the foundation pit and located between a first construction area and a second construction area of the foundation pit. The boundary supporting structure in this example has a row of concrete mixing pile I row and a row of concrete mixing pile II row, and concrete mixing pile I row and concrete mixing pile II row separate foundation ditch first construction district and foundation ditch later construction district, and concrete mixing pile II row sets up in concrete mixing pile I row and is close to the first construction side of foundation ditch.

In this embodiment concrete mixing stake I row divide into if dry concrete mixing stake I is right, every concrete mixing stake I that has two intercombinations, should if dry concrete mixing stake I arranges along boundary department to every certain interval.

In this example, the row of concrete mixing piles II is divided into a plurality of pairs of concrete mixing piles II, each pair of concrete mixing piles II is provided with two mutually combined concrete mixing piles II, the pairs of concrete mixing piles II are arranged in one-to-one correspondence with the gaps between the pairs of concrete mixing piles I and the pairs of concrete mixing piles I, and the two concrete mixing piles II in each pair of concrete mixing piles II are respectively corresponding to the corresponding concrete mixing piles I. In this embodiment, a crown beam is provided above the row I of concrete mixing piles and the row II of concrete mixing piles.

In this embodiment, a steel pipe pile is driven at the side of the concrete mixing pile II pair close to the foundation pit in advance, the steel pipe pile is positioned in the concrete mixing pile II, two concrete mixing piles are in contact, the lower end of the steel pipe pile is driven into the soil body, the upper end of the steel pipe pile is connected with a connecting rod through a pipe hoop, and is connected with an arched beam positioned in the construction area behind the foundation pit through the connecting rod, and two ends of the arched beam are respectively fixed on the foundation pit enclosure structures at two ends of the boundary supporting structure.

In this embodiment, two concrete mixing piles II in contact with the steel pipe pile and two concrete mixing piles I combined with the two concrete mixing piles II form a V-shaped structure, and the pressure generated in the post-foundation-pit construction area, which is applied to the concrete mixing pile I, II, is transmitted to the steel pipe pile.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides a boundary supporting construction of foundation ditch stage by stage construction in soft soil stratum sets up in boundary department of stage construction in the foundation ditch, its characterized in that: the foundation pit construction method comprises the following steps of (1) arranging a row of concrete mixing piles I and a row of concrete mixing piles II which are arranged on the side, close to the foundation pit construction side, of the row of concrete mixing piles I;

the concrete mixing pile I row is divided into a plurality of pairs of concrete mixing pile I pairs which are arranged at intervals, the concrete mixing pile II row is layered into a plurality of pairs of concrete mixing pile II pairs, and the concrete mixing pile II pairs are arranged corresponding to gaps between the concrete mixing pile I pairs and the concrete mixing pile I pairs;

a steel pipe pile is arranged on the side, close to the foundation pit, of the concrete mixing pile II pair, which is firstly constructed;

and crown beams are arranged above the concrete mixing pile I row and the concrete mixing pile II row.

2. The boundary supporting structure for stage construction of a foundation pit in a soft soil stratum of claim 1, characterized in that: and an arched beam is arranged on the rear construction side of the foundation pit of the concrete mixing pile I, two ends of the arched beam are fixed on foundation pit enclosing structures at two ends of the boundary supporting structure, and the arched beam is connected with the steel pipe pile through a connecting rod.

3. The boundary supporting structure for stage construction of a foundation pit in a soft soil stratum according to claim 2, characterized in that: the connecting rod is connected with the arched beam, and the other end of the connecting rod is connected with the steel pipe pile through a pipe hoop.

4. The boundary supporting structure for stage construction of a foundation pit in a soft soil stratum of claim 1, characterized in that: and a plurality of reinforcing ribs are formed on the inner wall of the steel pipe pile.

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