CN216238557U

CN216238557U - Foundation pit supporting structure of steel pipe pile and concrete prefabricated section

Info

Publication number: CN216238557U
Application number: CN202122587608.7U
Authority: CN
Inventors: 李仁民; 王建兰
Original assignee: Nanjing Deep Intelligent Construction Technology Research Institute Co ltd; Jiangsu South & East Geotechnical Technology Co ltd
Current assignee: Nanjing Deep Intelligent Construction Technology Research Institute Co ltd; Jiangsu South & East Geotechnical Technology Co ltd
Priority date: 2021-10-26
Filing date: 2021-10-26
Publication date: 2022-04-08
Anticipated expiration: 2031-10-26

Abstract

The utility model discloses a foundation pit supporting structure of a steel pipe pile and a concrete precast block, which comprises the steel pipe piles arranged at intervals and the concrete precast block arranged between two adjacent steel pipe piles, wherein a sealing groove is arranged on the first side surface of the concrete precast block facing to the steel pipe pile, the sealing groove extends along the height direction of the concrete precast block, a water-swelling rubber strip is arranged in the sealing groove, and the water-swelling rubber strip can be hermetically pressed on the peripheral surface of the steel pipe pile after swelling; after the construction of the underground main body structure is completed, the steel pipe pile can be pulled out and recovered. The concrete precast block is of a plain concrete structure or a reinforced concrete structure. Utilize this application, can cancel the hasp commonly used at present, utilize and meet water inflation rubber strip and carry out the expanded characteristic after meeting water, seal the gap between steel-pipe pile and the concrete prefabricated section, guarantee the stagnant water performance. This application can avoid the problem in the cavity that the casting concrete produced easily when adopting the hasp effectively.

Description

Foundation pit supporting structure of steel pipe pile and concrete prefabricated section

Technical Field

The utility model relates to a foundation pit supporting structure of a steel pipe pile and a concrete precast block.

Background

The steel pipe piles are the most supported piles, and the steel pipe piles are widely used gradually due to the advantages of convenience in sinking and recyclability, and water stopping performance is guaranteed.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a foundation pit supporting structure of a steel pipe pile and a concrete precast block, which comprises the steel pipe piles arranged at intervals and the concrete precast block arranged between two adjacent steel pipe piles, wherein a sealing groove is arranged on the first side surface of the concrete precast block facing the steel pipe piles, the sealing groove extends along the height direction of the concrete precast block, a water-swelling rubber strip is arranged in the sealing groove, and the water-swelling rubber strip can be hermetically pressed on the outer peripheral surface of the steel pipe pile after swelling; after the construction of the underground main body structure is completed, the steel pipe pile can be pulled out and recovered. The concrete precast block is of a plain concrete structure or a reinforced concrete structure. In order to facilitate sinking, pile tips are arranged at the bottoms of the concrete precast blocks.

The construction method comprises the following steps:

1. directly sinking the steel pipe pile; or constructing a pile hole, sinking the steel pipe pile into the pile hole, and completing backfilling of soil in the pile hole.

2. And (3) driving concrete precast blocks carrying water-swellable rubber strips between the adjacent steel pipe piles by using a vibration method or a static pressure method, so that the steel pipe piles and the concrete precast blocks form a support wall.

3. And constructing a crown beam at the top of the supporting wall, and then constructing a supporting system.

4. And excavating earth of the foundation pit and completing the excavation, then constructing an underground main structure, and constructing the outer wall of the basement for waterproofing and backfilling the side wall after the construction of the underground main structure is completed.

5. And (5) pulling out the steel pipe pile, and keeping the concrete precast block in the original position.

Utilize this application, can cancel the hasp commonly used at present, utilize and meet water inflation rubber strip and carry out the expanded characteristic after meeting water, seal the gap between steel-pipe pile and the concrete prefabricated section, guarantee the stagnant water performance. This application can avoid effectively when adopting the hasp, the problem in the cavity is easily produced to the cast concrete. And the step of lock catch pouring is eliminated, so that the construction efficiency can be effectively improved.

Furthermore, when the concrete precast block sinks with the water-swelling rubber strip, a soil body is sometimes pressed against the lower end face of the water-swelling rubber strip to cause the water-swelling rubber strip to generate compression deformation, and the water-swelling rubber strip can be separated from the sealing groove when the water-swelling rubber strip is serious, so that the lower end of the sealing groove does not penetrate through the lower end face of the concrete precast block downwards to cause the lower end of the sealing groove to have an inner end face;

in an original state, the water-swellable rubber strip faces the second side face of the steel pipe pile and does not extend out of the first side face.

Further, for guaranteeing that the water-swelling rubber strip is stably kept in the sealing groove in the sinking process, a clamping piece is arranged at the edge of at least one side of the notch of the sealing groove and used for avoiding the water-swelling rubber strip from being separated from the sealing groove outwards.

Specifically, in order to reduce the occupation of the clamping piece on the space of the sealing groove, the thickness of the clamping piece is 1-3mm and the first width of the clamping piece is 3-10mm when the clamping piece is observed along the height direction of the concrete precast block.

Furthermore, in order to reduce the probability of underground water entering between the steel pipe pile and the concrete precast block, the first side surface of the concrete precast block is in a circular arc shape matched with the outer side surface of the steel pipe pile, and the distance between the first side surface and the outer side surface of the adjacent steel pipe pile is 3-6 mm.

Further, the steel pipe pile is sunk in the pile hole or directly sunk underground according to different soil qualities; when the steel pipe pile is sunk in the pile hole, backfill soil is filled in the inner cavity of the steel pipe pile.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Fig. 2 is an enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic view of fig. 2 with the steel pipe pile and water-swellable rubber strip removed.

Fig. 4 is another state diagram of fig. 2.

Fig. 5 is a view in the direction B-B in fig. 2.

Fig. 6 is an axial sectional view of a concrete preform block.

Detailed Description

Referring to fig. 1-6, a foundation pit supporting structure of a steel pipe pile and a concrete precast block includes steel pipe piles 11 arranged at intervals and a concrete precast block 21 arranged between two adjacent steel pipe piles 11, a first side surface 211 of the concrete precast block 21 facing the steel pipe pile 11 is provided with a sealing groove 22, the sealing groove 22 extends along a height direction of the concrete precast block 21, a water-swellable rubber strip 30 is arranged in the sealing groove 22, and the water-swellable rubber strip 30 can be pressed against an outer circumferential surface of the steel pipe pile 11 in a sealing manner after swelling. And after the construction of the underground main body structure is completed, the steel pipe pile is pulled out and recovered.

In this embodiment, during construction, a pile hole is excavated, then the steel pipe pile 11 is sunk into the pile hole, and backfill 12 is filled in an inner cavity of the steel pipe pile. It is understood that in another embodiment, the steel pipe pile may be directly sunk by static pressure method or vibration method.

In this embodiment, the concrete precast block 21 is a reinforced concrete structure, and it can be understood that in another implementation, the concrete precast block 21 may also be a plain concrete structure.

The bottom of the concrete precast block is provided with a pile tip 26, the first side surface 211 of the concrete precast block is in a circular arc shape matched with the outer side surface of the steel pipe pile, and the distance L between the first side surface 211 and the outer side surface of the adjacent steel pipe pile is 5 mm.

The lower end of the sealing groove 22 does not penetrate the lower end surface of the concrete precast block downwards, so that the lower end of the sealing groove has an inner end surface 25 which faces upwards.

The edges of the two sides of the notch of the sealing groove are respectively provided with a clamping piece 23, each clamping piece 23 extends towards the other side of the notch, in the embodiment, each clamping piece is formed by a bent steel plate 24, one end of each steel plate 24 is embedded in the concrete precast block, and the other end of each steel plate 24 extends out of the concrete precast block to form the clamping piece. It can be understood that, in other embodiments, the retaining member may also be formed directly from concrete when the concrete precast block is poured, but the retaining member formed from concrete is thick and occupies a large space in the sealing groove, and the concrete is easy to have flashes when poured, which may scratch the water-swelling rubber strip, and it is recommended to use a metal member to make the retaining member 23.

In this embodiment, as viewed in the height direction of the concrete precast block, the thickness U of the retaining member is 2mm, the first width S of the retaining member is 4mm, the sealing groove 22 is rectangular, and the second width W of the sealing groove is 50 mm. The cross-sectional shape of the water-swelling rubber strip is the same as that of the sealing groove. In this embodiment, the second side surface 301 of the water-swelling rubber strip facing the steel pipe pile is flush with the first side surface 211, and it can be understood that, in other embodiments, the second side surface 301 of the water-swelling rubber strip may have a distance with the first side surface, and the distance is preferably controlled to be 1-2mm, so as to prevent the swelling amount of the water-swelling rubber strip from being tightly pressed against the steel pipe pile, which affects the water-stopping performance.

Utilize the card to hold the piece, make the water-swelling rubber strip under the original condition can keep in the seal groove steadily, when sinking the concrete prefabricated section, can not deviate from the seal groove. Fig. 2 is a schematic diagram of the water-swellable rubber strip in an original state, and fig. 4 is a schematic diagram of the water-swellable rubber strip expanding when encountering water and abutting against the steel pipe pile.

The construction of the embodiment comprises the following steps:

1. and (5) constructing a pile hole, sinking the steel pipe pile into the pile hole, and completing backfilling of soil in the pile hole.

2. And (3) driving concrete precast blocks between the adjacent steel pipe piles by using a vibration method, so that the steel pipe piles and the concrete precast blocks form a supporting wall. In other embodiments, the concrete precast block can be driven into the ground by using a static pressure method.

Claims

1. A foundation pit supporting structure of a steel pipe pile and a concrete precast block is characterized by comprising the steel pipe piles arranged at intervals and the concrete precast block arranged between two adjacent steel pipe piles, wherein a sealing groove is formed in the first side face, facing the steel pipe pile, of the concrete precast block, extends in the height direction of the concrete precast block, a water-swelling rubber strip is arranged in the sealing groove, and the water-swelling rubber strip can be hermetically pressed on the outer peripheral face of the steel pipe pile after swelling; after the construction of the underground main body structure is completed, the steel pipe pile can be pulled out and recovered.

2. The foundation pit supporting structure according to claim 1, wherein the lower end of the sealing groove does not penetrate through the lower end surface of the concrete precast block downwards, so that the lower end of the sealing groove has an inner end surface;

3. The foundation pit supporting structure according to claim 1,

the edge of at least one side at the notch of seal groove is provided with the card and holds the piece, and this card is held the piece and is used for avoiding meeting water inflation rubber strip outwards to deviate from the seal groove.

4. Foundation pit support structure according to claim 3,

the thickness of the clamping piece is 1-3mm, and the first width of the clamping piece is 3-10mm when the clamping piece is observed along the height direction of the concrete precast block.

5. The foundation pit supporting structure according to claim 1,

the first side face of the concrete precast block is in a circular arc shape matched with the outer side face of the steel pipe pile, and the distance between the first side face and the outer side face of the adjacent steel pipe pile is 3-6 mm.

6. The foundation pit supporting structure according to claim 1,

the steel pipe pile is sunk in the pile hole or directly sunk underground; when the steel pipe pile is sunk in the pile hole, backfill soil is filled in the inner cavity of the steel pipe pile.