CN111305191A

CN111305191A - Foundation pit fender pile suitable for space-limited condition and construction method thereof

Info

Publication number: CN111305191A
Application number: CN202010152283.7A
Authority: CN
Inventors: 雷升祥; 王飞; 杜孔泽; 王煦霖; 李骏; 黄双林; 李国良
Original assignee: China Railway First Survey and Design Institute Group Ltd
Current assignee: China Railway First Survey and Design Institute Group Ltd
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2020-06-19

Abstract

The invention relates to a foundation pit fender post suitable for a space-limited condition and a construction method thereof. The foundation pit fender post structure related by the invention constructs the plain concrete part in the fender post structure through a reasonable and flexible reinforcement arrangement mode, reduces the cross section area and the volume of the pile body through chiseling off the plain concrete part of the pile body at the later stage, thereby relatively expanding the structure implementation space at the inner side of the fender post, reserving larger implementation space of a newly-built structure as far as possible under the condition of limited space area, not only ensuring the bearing capacity of the fender post and the safety of a fender system to the maximum extent, reducing the influence on the existing structure to the maximum extent, but also utilizing the space area to the maximum extent.

Description

Foundation pit fender pile suitable for space-limited condition and construction method thereof

Technical Field

The invention relates to the technical field of underground engineering construction, in particular to a foundation pit fender pile suitable for a space-limited condition and a construction method thereof.

Background

Underground resources are fully utilized to provide a wide extension space for city development, and the method becomes an important means for reasonable city layout, ordered development and capacity expansion promotion. The urban underground space in China is mostly planned to be 'congenital deficiency' in a shallow range of 50m under the influence of poor planning systematicness, backward planning from practice and the like, and all departments are in many cases of administrative construction, so that unified and continuous planning and construction means are lacked. Along with the continuous development of cities in recent years, the development force of underground spaces is gradually increased, the underground space is influenced by factors such as early planning, repeated construction and expanded construction are more and more, a plurality of newly-built underground structures need to be built among existing structures without seals, some underground structures need to be communicated with one another, the construction space is extremely limited, inevitable interference and intersection can occur with the existing structures, the stability of the existing structures is influenced, and the construction of newly-built projects cannot be smoothly carried out. How to form the space of the newly-built underground structure to the maximum extent and be more convenient for later use is a key problem to be considered and solved.

Disclosure of Invention

The invention aims to provide a foundation pit fender post suitable for a space-limited condition and a construction method thereof, which are suitable for newly-built underground engineering in a limited space, and can ensure the space size, the use function, the structural bearing capacity and the stability of a newly-built structure to the maximum extent on the premise of ensuring that the existing structure is not influenced.

The technical scheme adopted by the invention is as follows:

be applicable to foundation ditch fender pile under the limited condition in space, its characterized in that:

the fender pile is a reinforced concrete pile, is close to the vertical through-length reinforcement in the inside of one side of an existing underground building, is close to the local reinforcement of the part above the bottom of the foundation pit on the other side, adopts plain concrete pouring, and chisels out in the later stage.

And the enclosure pile body at the lower part of the plain concrete part is chiseled out at the later stage of the enclosure pile without reinforcing bars, so that the plain concrete part is reserved.

And (3) chiseling the enclosure pile body reinforcement at the lower part of the plain concrete part at the later stage of the enclosure pile to form a retained reinforced concrete part.

The middle ring of the reinforcement part of the fender post is provided with a main reinforcement which is vertically communicated with the post body.

And the outside of the vertical through main rib is provided with a hoop reinforcement along the enclosure pile reinforcement cage.

And positioning steel bars which are triangular in the horizontal plane are arranged in the hooping of the steel reinforcement cage of the enclosure pile.

The positioning steel bar is connected with part of the vertical through main steel bar.

The construction method of the foundation pit fender post suitable for the space limited condition is characterized in that:

distributing ribs inside the fender post, and forming a later-stage chiseling plain concrete part above the bottom of the foundation pit of the fender post close to the inner side;

when the newly-built underground space structure main body of construction, the plain concrete part anaphase chisel of fender pile removes, forms the structure implementation space of relative bigger in the confined region of fender pile inboard.

The invention has the following advantages:

the foundation pit fender post structure provided by the invention constructs the plain concrete part in the fender post structure in a reasonable and flexible reinforcement arrangement mode, the plain concrete part of the pile body is relatively convenient to chisel, the cross section area and the pile body volume of the fender post structure are reduced by chiseling the plain concrete part at the later stage, so that the structure space at the inner side of the fender post is relatively enlarged, a relatively larger internal implementation area is reserved as far as possible under the condition of limited space, the bearing capacity of the fender post and the safety of a fender system are ensured, and meanwhile, the influence on the existing structure is reduced to the maximum extent.

Drawings

Fig. 1 is a construction plan view in a confined space.

Fig. 2 is a sectional view of construction in a confined space.

Figure 3 is a cross-sectional view of a fender post.

Fig. 4 is a schematic view of reinforcement of a fender pile portion according to a normal vertical through length.

Fig. 5 is a schematic view of a vertical special-shaped reinforcing bar of the fender pile part.

In the figure, 1-existing structure, 2-newly built underground structure, 3-existing ground building, 4-existing underground building, 5-fender pile, 6-later-stage chiseling off plain concrete part, 7-newly built underground space structure main body, 8-reinforced concrete part, 9-vertical through main reinforcement, 10-positioning reinforcement, 11-fender pile reinforcement cage ring stirrup, 12-reserving plain concrete part, 13-foundation pit bottom, 14-ground, 15-reserving reinforced concrete part.

Detailed Description

The present invention will be described in detail with reference to specific embodiments.

The invention relates to a foundation pit fender post suitable for a space-limited condition, wherein the fender post 5 is a reinforced concrete pile, the inner part of the fender post close to one side of an existing underground building 4 is vertically provided with ribs according to a normal through length, the part close to the bottom 13 of the foundation pit on the other side is not provided with ribs, and a plain concrete part 6 convenient to chive off in the later period is formed. The range of the later-period chiseling plain concrete part 6 is comprehensively determined by the construction space required by the bottom 13 of the newly-built foundation pit and the inner periphery of the fender pile 5.

The enclosure pile body at the lower part of the plain concrete part 6 of the enclosure pile 5 is chiseled at the later stage without reinforcing bars, so that a reserved plain concrete part 12 is formed. After the plain concrete part at the upper part is chiseled off at the later stage, the plain concrete part at the lower part can be used as the foundation of the side wall of the inner wall main body structure.

The enclosure pile body at the lower part of the plain concrete part 6 of the enclosure pile 5 can be chiseled to be reinforced to form a reserved reinforced concrete part 15. After the plain concrete part at the upper part is chiseled off at the later stage, the reinforced concrete part at the lower part can also be used as a side wall foundation of the inner wall main body structure. The reinforced concrete part top surface of lower part also can reserve the steel bar and connect, with the reinforcement in the major structure boundary wall together, improve whole atress effect.

The circumference in the reinforcement of the fender post 5 is provided with a main reinforcement 9 which is vertically communicated with the post body. And the outside of the vertical through main rib 9 is provided with an enclosure pile reinforcement cage ring stirrup 11. And the enclosure pile reinforcement cage ring stirrup 11 is internally provided with a vertical positioning steel bar 10 with a triangular horizontal surface. The positioning reinforcing steel bars 10 are connected with part of the vertical through main reinforcing steel bars 9. The hoop reinforcement 11 and the plane erection reinforcement 10 are arranged along the pile body longitudinally in a synchronous or staggered mode according to a certain distance.

During construction, ribs are distributed on the inner side part of the fender post 5, and a plain concrete part 6 convenient to chive off at the later stage is formed above the bottom 13 of a foundation pit on the inner side of the fender post 5; when the underground space structure body 7 is newly built, the plain concrete part 6 included in the fender post 5 is chiseled out later, and a relatively larger construction space and a larger later-use space are formed in the fender post 5.

The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.

Claims

1. Be applicable to foundation ditch fender pile under the limited condition in space, its characterized in that:

the fender pile (5) is a reinforced concrete pile, is close to the vertical through-length reinforcement of the inside on one side of the existing underground building (4), is close to the local reinforcement of the part above the foundation pit bottom (13) on the other side, is poured by adopting plain concrete (6), and is chiseled at the later stage.

2. A foundation pit fender post suitable for space-constrained conditions according to claim 1, wherein:

and the enclosure pile body at the lower part of the plain concrete part (6) is chiseled out at the later stage of the enclosure pile (5) without reinforcing bars, so that a reserved plain concrete part (12) is formed.

3. A foundation pit fender post suitable for space-constrained conditions according to claim 1, wherein:

and the enclosure pile body reinforcement at the lower part of the plain concrete part (6) is chiseled out in the later period of the enclosure pile (5) to form a reserved reinforced concrete part (15).

4. A foundation pit fender post suitable for space-constrained conditions according to claim 2 or 3, wherein:

the middle ring of the reinforcement part of the fender post (5) is provided with a main reinforcement (9) which vertically penetrates along the post body.

5. A foundation pit fender pile suitable for space-constrained conditions according to claim 4, wherein:

and the outside of the vertical through main rib (9) is provided with a hoop reinforcement (11) along the steel reinforcement cage of the enclosure pile.

6. A foundation pit fender pile suitable for space-constrained conditions according to claim 5, wherein:

and positioning steel bars (10) which are triangular in the horizontal plane are arranged in the retaining pile reinforcement cage ring stirrups (11).

7. A foundation pit fender pile suitable for space-constrained conditions according to claim 6, wherein:

the positioning steel bar (10) is connected with a part of vertical through main bars (9).

8. The construction method of the foundation pit fender post suitable for the space limited condition is characterized in that:

distributing ribs inside the fender post (5), and forming a later-stage chiseling plain concrete part (6) above the bottom (13) of the foundation pit, close to the inner side, of the fender post (5);

when the underground space structure main body (7) is constructed and newly built, the plain concrete part (6) of the guard post (5) is chiseled off at the later stage, and a relatively larger structure implementation space is formed in the limited area at the inner side of the guard post (5).