CN-121976556-A - Combined foundation structure for capping beam construction aiming at soft soil foundation

CN121976556ACN 121976556 ACN121976556 ACN 121976556ACN-121976556-A

Abstract

The invention relates to the field of bridge engineering construction, in particular to a combined foundation structure for capping beam construction of a soft soil foundation, which comprises a bearing part, a first steel pipe pile, a second steel pipe pile and a third steel pipe pile, wherein the first steel pipe pile is supported on a bearing platform of a first pier column, the second steel pipe pile is supported on a bearing platform of a second pier column, the third steel pipe pile is arranged between the first pier column and the second pier column, a concrete strip foundation is arranged at the bottom of the third steel pipe pile and is supported on the ground through the concrete strip foundation, and the bearing part is used for supporting a steel bottom die. According to the invention, the bottom of the first steel pipe pile is supported on the bearing platform of the first pier column, the bottom of the second steel pipe pile is supported on the second pier column, and the first steel pipe pile, the second steel pipe pile and the third steel pipe pile are matched together to bear the dead weight and the construction load of the steel bottom die, so that the pretreatment of a soft soil foundation in a large range is not needed, the whole engineering quantity is reduced, and the construction progress is accelerated.

Inventors

ZHONG CHANGHAI
LI XIANGQIAN
CHEN AILING
HUANG YUEQIN
SUN WENXIN
Wan Zongtao
CAO RONGLONG

Assignees

中国水利水电第五工程局有限公司

Dates

Publication Date: 20260505
Application Date: 20260318

Claims (10)

1. The composite foundation structure for capping beam construction of the soft soil foundation comprises a capping beam (5), wherein the capping beam is poured on the tops of a formed first pier column (603) and a formed second pier column (604) through a steel bottom die (501), and the bottoms of the first pier column (603) and the second pier column (604) are driven into a hardening layer below the soft soil foundation; the combined foundation structure is characterized by comprising a bearing part (4), a first steel pipe pile (1), a second steel pipe pile (2) and a third steel pipe pile (3); The bottom of the first steel pipe pile (1) is supported on a bearing platform (601) of a first pier column (603); a bearing platform (601) of the second pier column (604) is supported at the bottom of the second steel pipe pile (2); The third steel pipe pile (3) is arranged between the first pier column (603) and the second pier column (604), the bottom of the third steel pipe pile is provided with a concrete strip foundation (301), and the third steel pipe pile is supported on the ground through the concrete strip foundation (301); The top of each of the first steel pipe pile (1), the second steel pipe pile (2) and the third steel pipe pile (3) is used for supporting a bearing part (4), and the bearing parts (4) are used for supporting a steel bottom die (501).
2. The composite foundation structure for bent cap construction of soft foundation according to claim 1, wherein the bearing part (4) comprises a first distribution beam (401), a bailey distribution beam (402), a second distribution beam (403) and a disc buckle supporting frame (404), wherein the first distribution beam (401) is provided with a plurality of steel pipe piles (1), the second steel pipe piles (2) and the third steel pipe piles (3) horizontally arranged at the tops of the first distribution beam (401) along the width direction of the bent cap (5), the bailey distribution beam (402) is horizontally arranged at the tops of all the first distribution beams (401) along the length direction of the bent cap (5), the second distribution beam (403) is provided with a plurality of second distribution beams (403) horizontally arranged at the tops of the bailey distribution beam (402) along the width direction of the bent cap (5), the disc buckle supporting frame (404) is horizontally arranged at the tops of the second distribution beam (403) along the length direction of the bent cap (5), and the steel bottom die (501) is arranged at the disc buckle supporting frame (404).
3. The combined foundation structure for bent cap construction for soft soil foundations of claim 2, wherein the disc buckle supporting frame (404) comprises a plurality of telescopic supports (4041), jacking supports (4042) and third distribution beams (4043), wherein the telescopic supports (4041) are distributed on the tops of the second distribution beams (403) in a lattice mode, the tops of the telescopic supports (4041) are fixedly connected with the jacking supports (4042) in a one-to-one correspondence mode respectively, and the third distribution beams (4043) are arranged inside the jacking supports (4042) along the width direction of the bent cap (5) and are fixedly connected with the bottom surface of the steel bottom die (501).
4. The composite foundation structure for capping beam construction for soft soil foundations according to claim 1, wherein at least two first steel pipe piles (1) and at least two second steel pipe piles (2) are respectively arranged, the first steel pipe piles (1) and the second steel pipe piles (2) are rectangular and distributed on top surfaces of a bearing platform (601) of a first pier column (603) and a bearing platform (601) of a second pier column (604), the first steel pipe piles (1) are connected with the first pier column (603) through anchor clamps (602), and the second steel pipe piles (2) are also connected with the second pier column (604) through anchor clamps (602).
5. The composite foundation structure for bent cap construction for soft soil foundations according to claim 1, wherein a plurality of third steel pipe piles (3) are arranged along the width direction of the bent cap (5) to form a third steel pipe pile group, and a plurality of third steel pipe pile groups are arranged along the length direction of the bent cap (5).
6. The composite foundation structure for bent cap construction for soft soil foundations according to claim 5, wherein all first steel pipe piles (1) and all second steel pipe piles (2) are connected through a connecting system (8), the first steel pipe piles (1) are connected with adjacent third steel pipe piles (3), the second steel pipe piles (2) are connected with the adjacent third steel pipe piles (3) through the connecting system (8), and all third steel pipe piles (3) in a single third steel pipe pile group are connected through the connecting system (8).
7. The composite foundation structure for capping beam construction for soft soil foundations according to claim 1, wherein the concrete strip foundation (301) comprises a base plate (3011) and a connecting table (3012), the connecting table (3012) is connected to the top surface of the base plate (3011), and the connecting table (3012) is connected with a third steel pipe pile (3) through a pre-buried connecting sleeve (3013) and a flange plate (3014).
8. A composite foundation structure for bent cap construction for soft foundations according to claim 1, wherein the top surface of the bent cap (5) is an inclined surface.
9. The combined foundation structure for bent cap construction for soft soil foundations of claim 1, further comprising a hose (7) and a water level sensor, wherein the hose (7) is bound on the side face of the bearing part (4) along the length direction of the bent cap (5), two ends of the hose are lifted upwards to form an inclined section, air holes communicated with the atmosphere are formed in the top side face of the inclined section, and the water level sensor is fixed in the inclined sections at two ends of the hose (7) along the axial direction respectively.
10. The composite foundation structure for capping beam construction of soft soil foundations according to claim 9, further comprising a signal transmitter, a signal receiver (701), a signal processor and a data memory, wherein the signal transmitter is electrically connected with the water level sensor, the signal transmitter is electrically connected with the signal receiver (701), the signal receiver (701) is sequentially electrically connected with the signal processor and the data memory, and the electric signal detected by the water level sensor is transmitted to the signal receiver (701) through the signal transmitter and is processed by the signal processor, and then the processing result is stored in the data memory.

Description

Combined foundation structure for capping beam construction aiming at soft soil foundation Technical Field The invention relates to the field of bridge engineering construction, in particular to a combined foundation structure for capping beam construction aiming at a soft soil foundation. Background The capping beam is a bearing member positioned at the top end of the bridge pier in the bridge structure and is mainly used for supporting and transmitting the load of the upper structure. Due to the excellent bearing capacity and stability of the capping beams, the capping beams are increasingly applied to municipal elevated and expressway casing ramp bridges. When the bridge is positioned on a deep soft soil foundation such as silt and silt clay, the traditional bracket method construction adopts a scaffold erected on the ground as a supporting platform, and the foundation needs to be subjected to pretreatment such as replacement, pile foundation composite foundation, cast-in-place concrete foundation and the like. Based on the large dead weight and load of the bent cap, the soft soil foundation in the whole bracket coverage area needs to be pretreated during construction by the traditional bracket method, and the related pretreatment construction area is large, so that the construction process is very complicated, and the whole engineering quantity is large. Therefore, a combined foundation structure for capping beam construction for soft soil foundation is provided to solve the above technical problems. Disclosure of Invention The invention provides a combined foundation structure for performing capping beam construction on a soft soil foundation, which aims to solve the problems that in the prior art, when a traditional bracket method is adopted for constructing a large-span capping beam on the soft soil foundation, large-area foundation pretreatment is required, the construction process is very complicated, and the whole engineering quantity is large. In order to solve the technical problems, the invention adopts the technical scheme that the composite foundation structure for constructing the capping beam for the soft soil foundation comprises a bearing part, a first steel pipe pile, a second steel pipe pile and a third steel pipe pile, wherein the capping beam is poured at the tops of a formed first pier column and a formed second pier column through a steel bottom die, and the bottoms of the first pier column and the second pier column are driven into a hardening layer below the soft soil foundation; The bottom of the first steel pipe pile is supported on a bearing platform of the first pier column; The bottom of the second steel pipe pile is supported on a bearing platform of the second pier column; The third steel pipe pile is arranged between the first pier column and the second pier column, a concrete strip foundation is arranged at the bottom of the third steel pipe pile, and the third steel pipe pile is supported on the ground through the concrete strip foundation; the tops of the first steel pipe pile, the second steel pipe pile and the third steel pipe pile are respectively used for supporting a bearing part, and the bearing part is used for supporting a steel bottom die. The bearing part comprises a plurality of first distribution beams, a plurality of bailey distribution beams, a plurality of second distribution beams and a disc buckle supporting frame, wherein the first distribution beams are horizontally arranged at the tops of the first steel pipe pile, the second steel pipe pile and the third steel pipe pile respectively along the width direction of the capping beam, the bailey distribution beams are horizontally arranged at the tops of all the first distribution beams along the length direction of the capping beam, the plurality of second distribution beams are horizontally arranged at the tops of the bailey distribution beams along the width direction of the capping beam, the disc buckle supporting frame is horizontally arranged at the top of the second distribution beams along the length direction of the capping beam, and the steel bottom die is arranged at the top of the disc buckle supporting frame. The tray buckle supporting frame comprises a plurality of telescopic supports, jacking and third distributing beams, wherein the telescopic supports are distributed on the tops of the second distributing beams in a lattice mode, the tops of the telescopic supports are fixedly connected with the jacking in a one-to-one correspondence mode, and the third distributing beams are arranged in the jacking along the width direction of the cover beam and are fixedly connected with the bottom surface of the steel bottom die. The first steel pipe pile and the second steel pipe pile are respectively provided with at least two, the first steel pipe pile and the second steel pipe pile are rectangular and are arranged on the top surfaces of a bearing platform of the first pier column and a bearing plat