CN210621712U

CN210621712U - Hollow long and short pile combined enclosure structure

Info

Publication number: CN210621712U
Application number: CN201921189261.7U
Authority: CN
Inventors: 罗少华
Original assignee: China Railway Nanchang Group Co Ltd
Current assignee: China Railway Nanchang Group Co Ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-05-26
Anticipated expiration: 2029-07-26

Abstract

The utility model provides a hollow long and short pile combination envelope, envelope comprises long stake (1) and short pile (2), and long, short pile mutual collocation arranges, and the stake is hollow structure (3), and two circular shape holes (5) of pile body design in the junction. Adopt the utility model discloses cloth stake form structure can material saving, reduce cost, reduction of erection time under the prerequisite that satisfies safety.

Description

Hollow long and short pile combined enclosure structure

Technical Field

The utility model relates to a hollow long and short pile combination enclosure structure belongs to civil engineering foundation ditch technical field.

Background

With the development of economy and the acceleration of city construction in China, the reasonable development and utilization of underground space have become a trend, for example, underground engineering such as underground garages, underground shopping malls and subways are built in large quantities in various cities in China. However, when the underground space is developed, the problems that the surrounding environment of the foundation pit is more and more complex and the depth is deeper and deeper are faced, and in addition, the more the resources are limited, the more important the improvement of the self technology and the economic rationality of the foundation pit engineering are.

In the excavation process of the deep foundation pit in the soft soil area, the whole instability of the foundation pit is easily caused due to the high water content and the low shear strength of the soil body. In the design of the foundation pit enclosure, a design method of equal-length piles is often adopted to solve the stability problem of the foundation pit, and the pile length is basically controlled by meeting the integral stability of the foundation pit. Because the bending moment below the pit bottom is reduced along with the depth, the bending resistance and the bearing performance of the lower part of the equal-length pile cannot be fully exerted; in order to achieve the compressive, bending and shearing resistance of the conventional fender post, the pile is generally designed to have an enlarged section so as to improve the overall strength and the bearing capacity of a pile foundation; meanwhile, the case of failure of the waterproof curtain also happens occasionally, so that foundation pit engineering accidents are caused, and the construction period of the foundation pit is delayed.

In summary, the problems of the prior art are as follows: the existing method undoubtedly causes many potential safety hazards, large workload and low working efficiency, and particularly wastes materials to greatly increase the engineering cost.

Disclosure of Invention

The utility model aims at overcoming the problem that has excavation supporting stability and material saving among the prior art, disclosing a hollow length stake combination enclosure structure.

The technical scheme of the utility model as follows, a hollow length stake combination retaining structure, retaining structure comprises the length stake, and long, short pile arrange of arranging each other in pairs, and the stake is hollow structure, and the pile body designs two circular shape holes in the junction.

The long pile and the short pile are of a prefabricated prestressed concrete structure.

And when the long pile and the short pile are used for combining the enclosure structure, the long pile and the short pile are both positioned in the same side of the foundation pit.

The long pile is 1.2 times of the short pile.

The cross-sectional areas of the long pile and the short pile allow the cross-sectional areas of the two piles to be the same, and also allow the cross-sectional areas of the two piles to be different.

The cross sections of the long pile and the short pile are rectangular or circular; the hollow part in the cross section of the long pile and the short pile is rectangular or circular.

The long pile and the short pile are arranged along the length direction of the pile, the section of the pile body is arranged in the middle of the left and right connection parts, and each side is provided with a semicircular hole with the same diameter.

After a plurality of hollow piles are spliced together to form a continuous wall body, two circular holes are naturally formed at the joint of every two adjacent pile bodies, and then grouting is performed in the two holes, so that the water stopping effect can be achieved.

The beneficial effects of the utility model reside in that, when total pile length is a timing: the bending bearing capacity of the long and short pile combined enclosing structure is more than or equal to that of the isometric row pile enclosing structure; when the pile requires a certain material: the bending rigidity of the hollow square pile is more than or equal to that of the solid row pile; when the cost of the water stopping is fixed: the water stopping cost of the interlocking hollow square pile is ≫ that of the common fender pile. Adopt the utility model discloses cloth stake form structure can material saving, reduce cost, reduction of erection time under the prerequisite that satisfies safety.

Drawings

FIG. 1 is a schematic view of a fender post under force; FIG. 2 is a partial view of a hollow long and short pile combined enclosure structure;

in the figure: 1 is a long pile, 2 is a short pile, 3 is a hollow pipe, 4 is a crown beam, and 5 is a reserved round hole.

Detailed Description

As shown in fig. 1, the hollow long and short pile combined enclosure structure of the present embodiment is composed of a long pile 1 and a short pile 2, the long pile and the short pile are arranged in a matching manner, the piles are hollow structures 3, and two circular holes 5 are designed at the connection position of the pile body.

To further understand the structure, characteristics and functions of the present invention, the following embodiments are provided.

The present embodiment is only for illustrating the present invention, and not for limiting the present invention, the detailed description is as follows:

the planar shape of a foundation pit of a certain basement is rectangular, the length of the foundation pit is 92m, the width of the foundation pit is 57m, the excavation depth of the foundation pit is 10.1m, and the schematic plane view of the foundation pit support is shown in figure 2. In the engineering of the embodiment, a prefabricated prestressed square pile is used as an enclosure structure, the section of a pile body is a square with the side length of 0.8m multiplied by 0.8m, the hollow part is a circle with the diameter of 0.5m, and the pile length is 16.5 m; two reinforced concrete supports are respectively erected at the positions 1.2m and 5.8m below the ground.

The embodiment of the invention provides a hollow long and short pile combined enclosing structure and a construction method, which comprises the following steps:

(1) prefabricating piles (the diameter of the reserved round hole is 0.05 m) according to design requirements and transporting the piles to the site;

(2) and determining the supporting mode of the pile. The project is that a short supporting pile is arranged at intervals of a long supporting pile. (in other projects, two short supporting piles can be arranged at intervals of one long supporting pile, or one short supporting pile can be arranged at intervals of two long supporting piles, or other similar intervals with different lengths).

(3) Site cleaning → measurement and positioning → pile driver in place → pile hanging → pile tip in place pile inserting → pile body alignment in centering → pile pressing → pile splicing → pile pressing to design elevation (long pile 16.5m, short pile 12.5 m) → stopping pile sinking → pile cutting (pile driving) → turning to next pile position.

(4) Crown beam, supporting formwork, pouring and maintaining.

(5) Grouting and maintaining the round hole.

(6) And (5) checking and accepting the positions, the elevations, the water stopping and the like of the long and short piles.

Claims

1. The hollow long and short pile combined enclosure structure is characterized in that the enclosure structure is composed of long and short piles, the long and short piles are arranged in a matched mode, the piles are hollow, and two round holes are formed in the connection position of a pile body.

2. The combined hollow long and short pile containment structure of claim 1, wherein the long and short piles are pre-fabricated prestressed concrete structures.

3. The combined enclosure structure of hollow long and short piles as claimed in claim 1, wherein the long and short piles are located in the same side of the foundation pit.

4. The combined hollow long and short pile enclosure structure of claim 1, wherein the long pile is 1.2 times or more than the short pile.

5. The combined hollow long and short pile enclosure structure of claim 1, wherein the cross-sectional areas of the long and short piles are allowed to be the same and different.

6. The combined enclosure structure of the hollow long and short piles as claimed in claim 1, wherein the cross sections of the long and short piles are rectangular or circular; the hollow part in the cross section of the long pile and the short pile is rectangular or circular.

7. The combined enclosure structure of hollow long and short piles as claimed in claim 1, wherein the long and short piles are arranged along the length direction of the pile, the section of the pile body is arranged in the middle of the left and right joints, and each side of the pile body is provided with a semicircular hole with the same diameter.

8. The combined enclosure structure of the hollow long and short piles as claimed in claim 7, wherein after the hollow piles are spliced together to form the continuous wall, two circular holes are naturally formed at the joint of every two adjacent pile bodies, and grouting is performed in the two holes.