CN-116556362-B - Foundation pit double-row pile retaining structure and construction method thereof

CN116556362BCN 116556362 BCN116556362 BCN 116556362BCN-116556362-B

Abstract

The invention discloses a foundation pit double-row pile retaining structure and a construction method thereof, and aims to provide a foundation pit double-row pile retaining structure with good deformation control effect, strong soil pressure resistance and high stability and a construction method thereof. A foundation pit double-row pile retaining structure comprises a front row pile, a front row pile crown beam, a rear row pile crown beam, a pull beam, overlap joint section steel and overlap joint section steel, wherein the front row pile is arranged in a soil body, the top of the front row pile is connected with the front row pile crown beam, the rear row pile is arranged in the soil body, the front row pile is positioned between the rear row pile and a foundation pit, the top of the rear row pile is connected with the rear row pile crown beam, the pull beam is connected with the front row pile crown beam and the rear row pile crown beam, the overlap joint section steel is inserted in the soil body and is obliquely distributed, the lower end of the overlap joint section steel is connected with the rear row pile, and the upper end of the overlap joint section steel is connected with the pull beam or the front row pile crown beam.

Inventors

ZHANG JINHONG
YU YI
ZHAO JUNJIAN
DUAN QIQI
LI BINGHE
ZHANG LISHA
CHEN DONG
LIU XINGWANG
SUN ZHENGBO
XIONG YIFAN
YANG KONGLI

Assignees

浙江省建筑设计研究院
浙大城市学院

Dates

Publication Date: 20260505
Application Date: 20230417

Claims (8)

1. The utility model provides a foundation ditch double row stake fender structure which characterized in that includes: the front row piles are arranged in the soil body; The top of the front row of piles is connected with the front row of pile crown beams; the rear row of piles are arranged in the soil body, and the front row of piles are positioned between the rear row of piles and the foundation pit; The top of the rear row of piles is connected with the rear row of pile crown beams; A pull beam connected with the front row pile crown beam and the rear row pile crown beam; The lap joint section steel is inserted into the soil body, the lap joint section steel is obliquely distributed, the lower end of the lap joint section steel is connected with the rear row piles, and the upper end of the lap joint section steel is connected with the pull beam or the front row pile crown beam; The guiding device is fixed on the ground surface and is close to the front row piles and comprises a guiding steel sleeve and a bottom steel sleeve box, inner holes of the guiding steel sleeve are distributed in an inclined mode, the guiding steel sleeve guides the lap joint steel in the process that the lap joint steel is inserted into soil, the bottom steel sleeve box is pressed into the soil, the guiding steel sleeve is located above the bottom steel sleeve box, and the guiding steel sleeve is connected with the bottom steel sleeve box through steel rib plates.
2. The foundation pit double-row pile retaining structure according to claim 1, wherein the rear row piles comprise reinforcement cages, a plurality of lower connecting reinforcements are arranged on the lower end face of the lap joint section steel, and the lower connecting reinforcements are inserted into the reinforcement cages of the rear row piles.
3. The foundation pit double-row pile retaining structure according to claim 2, wherein the lap joint steel is fixed with a grouting guide pipe, the lap joint steel is inserted into the soil before the concrete of the rear row pile is solidified, the lower connecting steel bar is inserted into the concrete of the rear row pile, the lower end of the grouting guide pipe is close to or inserted into the concrete of the rear row pile, and after the lower connecting steel bar is inserted into the concrete of the rear row pile, the connecting part of the lap joint steel and the rear row pile is grouted and reinforced through the grouting guide pipe.
4. A retaining structure for double row piles of foundation pit according to claim 2 or 3, wherein the lower end surface of the overlap section steel is a concave arc surface, and the arc of the concave arc surface is matched with the arc of a reinforcement cage of a rear row pile.
5. A foundation pit double-row pile retaining structure according to claim 1,2 or 3, wherein the upper end surface of the lap joint section steel is provided with a plurality of upper connecting steel bars, and the upper connecting steel bars are anchored into a pull beam or a front row pile crown beam.
6. A foundation pit double row pile retaining structure according to claim 1,2 or 3, further comprising a fixed section steel, wherein the front row pile comprises a reinforcement cage, and the fixed section steel is welded to the reinforcement cage of the front row pile.
7. The foundation pit double row pile retaining structure according to claim 6, wherein the bottom steel sleeve is welded with the fixed section steel.
8. A foundation pit double-row pile retaining structure according to claim 1, 2 or 3, wherein the overlap section steel and the rear row piles and the pull beams connected with the overlap section steel are distributed in a triangle shape.

Description

Foundation pit double-row pile retaining structure and construction method thereof Technical Field The invention relates to the technical field of foundation pit support, in particular to a foundation pit double-row pile support structure and a construction method thereof. Background Foundation pit supports typically provide concrete row piles within the foundation pit sidewall soil body. When the soil quality of the site is poor, the deformation control requirement is high or the excavation depth of the foundation pit is deep, an inner support is usually arranged to ensure the safety and stability of the foundation pit and control the deformation of the foundation pit. Aiming at the construction of a large-area foundation pit, the foundation pit has large area and longer perimeter, if an inner support type retaining structure is adopted, the inner support needs to span the foundation pit, the length is long, the construction is inconvenient, the construction cost is higher, the overlong support rigidity is weakened, the social and economic effects are not obvious, and the environment-friendly goal is not met. The traditional double-row pile retaining structure is convenient to construct and low in manufacturing cost, is widely applied to foundation pit support of a basement, but the relative positions of two rows of piles of the traditional double-row pile retaining structure are parallel, the structure is essentially a cantilever retaining structure, the deformation control capability is poor, the traditional double-row piles are easy to deform under the condition of high soil pressure, the protection of surrounding municipal roads, pipelines and the like is unfavorable, and the structure is difficult to be applied when the requirement on environmental protection is high. In the project with high field soil weakness or deformation control requirement, conventionally, soil between double-row piles is reinforced and improved by adopting processes of stirring, rotary spraying, grouting and the like, so that a strong overall rigidity is obtained, stability of a foundation pit and deformation resistance are improved, but large-area soil reinforcing quality is difficult to control, a large amount of cement resources are consumed, and environmental protection is not good. Therefore, there is a need for a double-row pile retaining structure with good deformation control effect, strong soil pressure resistance and high stability, and a construction method thereof. Disclosure of Invention The invention aims to provide a foundation pit double-row pile retaining structure with good deformation control effect, strong soil pressure resistance and high stability and a construction method thereof. The technical scheme of the invention is as follows: A foundation pit double row pile retaining structure, comprising: front row piles are arranged in the soil body; The top of the front row of piles is connected with the front row of pile crown beams; the rear row of piles is arranged in the soil body, and the front row of piles is positioned between the rear row of piles and the foundation pit; The top of the rear row of piles is connected with the rear row of pile crown beams; the beam is pulled and connected with the front row pile crown beam and the rear row pile crown beam; And the lap joint section steel is inserted in the soil body, the lap joint section steel is obliquely distributed, the lower end of the lap joint section steel is connected with the rear row piles, and the upper end of the lap joint section steel is connected with the pull beam or the front row pile crown beam. This scheme is with preceding row pile, preceding row pile crown beam, back row pile and back row pile crown beam as an organic whole through overlap joint shaped steel and draw beam to be triangle-shaped distribution between overlap joint shaped steel and the back row pile and the draw beam three of being connected with overlap joint shaped steel, thereby effectually promoted the stability and the resistance to deformation ability of foundation ditch double row pile retaining structure of this scheme, its control deformation is effectual, the resistance to soil pressure ability is strong and the stability is high, and then makes the whole level promotion of retaining structure, guarantees foundation ditch safety. Preferably, the rear row piles comprise reinforcement cages, the lower end faces of the lap joint section steel are provided with a plurality of lower connecting reinforcements, and the lower connecting reinforcements are inserted into the reinforcement cages of the rear row piles. Therefore, the connection stability and reliability of the lower end of the lap joint section steel and the rear row piles are guaranteed, and the problem that the lower end of the lap joint section steel and the rear row piles are separated and fall off and cannot exert efficacy in the use process of the double row piles is avoided. Preferably, the lap joi