CN113404060A - Rigid rib wall type pile wall foundation pit supporting structure and construction method - Google Patents
Rigid rib wall type pile wall foundation pit supporting structure and construction method Download PDFInfo
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- CN113404060A CN113404060A CN202110884092.4A CN202110884092A CN113404060A CN 113404060 A CN113404060 A CN 113404060A CN 202110884092 A CN202110884092 A CN 202110884092A CN 113404060 A CN113404060 A CN 113404060A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention relates to a rigid rib wall type pile wall foundation pit supporting structure and a construction method. The rigid rib wall type pile wall foundation pit supporting structure fully utilizes available space outside the outer side line of the underground structure inside the red line, and is a foundation pit supporting structure which can be formed without occupying the internal space of a foundation pit, implementing anchor rods outside the foundation pit and arranging supports in the foundation pit. The rigid rib wall type pile wall foundation pit supporting structure is large in integral structure rigidity, clear and definite in stress, simple and convenient to construct, high in speed and reliable in quality, the application range of the supporting and retaining type supporting structure is expanded, the construction period of foundation pit supporting, earth excavation and underground structures is greatly shortened, and the construction cost is effectively saved.
Description
Technical Field
The invention relates to the field of fixed buildings, in particular to an underground structure of a fixed building and a construction method, and more particularly relates to a foundation pit supporting structure and a construction method.
Background
The pile-anchor support is a deep foundation pit support often adopted at present, however, in actual foundation pit support engineering, certain limiting conditions often exist, and anchor rods or anchor cables cannot be implemented. For example, the adjacent areas of the foundation pit have existing or to-be-built underground buildings, subways, underground barriers and the like, the anchor rods or the anchor cables are poor in implementation effect or large in implementation difficulty and risk, and more local regulations do not allow the anchor rods or the anchor cables to exceed the red line of the ground.
Under the above circumstances, the foundation pit support can only adopt an inner support mode. However, the internal support supporting mode has the disadvantages of more members, large volume, complex process, occupation of a large amount of underground structural space, high cost, high construction difficulty and long period; and in the later period, procedures such as support replacement, support removal and the like are required to be added along with the construction of the underground structure, so that the construction cost is further increased, and the construction period is prolonged.
Therefore, the prior art needs to develop a deep foundation pit supporting structure and a deep foundation pit supporting method which have the advantages of low supporting cost, no occupation of the internal space of a foundation pit, no arrangement of an anchor rod, no arrangement of a support and short construction period.
Disclosure of Invention
In order to solve the technical problems that anchor-pull supporting cannot be implemented due to various limiting conditions in foundation pit supporting engineering, the cost of inner support supporting is high, and the construction period is long, the application provides a rigid rib wall type pile wall foundation pit supporting structure and a construction method.
In a first aspect of the invention, a rigid ribbed wall type pile wall foundation pit supporting structure is provided, which is arranged in an available space from the outer side of an outer side line of an underground structure to the inner side of a construction grade line, and mainly comprises an outer pile wall, an inner pile wall, a rigid ribbed wall, a top longitudinal beam and a top cross beam, wherein the outer pile wall is arranged along the outer side of the outer side line of the underground structure; the inner pile walls are arranged between the outer sides of the outer side lines of the underground structure and the outer pile walls, and the center line of each inner pile wall is parallel to the center line of each outer pile wall; the rigid rib wall is rigidly connected between the outer pile wall and the inner pile wall and is vertical to the outer pile wall and the inner pile wall; the top longitudinal beam is arranged at the tops of the outer pile wall and the inner pile wall, and a rigid connection is formed at the tops of the outer pile wall and the inner pile wall; the top cross beam is arranged between the top longitudinal beam at the upper part of the outer pile wall and the top longitudinal beam at the upper part of the inner pile wall and is in rigid connection with the top longitudinal beams at the upper parts of the outer pile wall and the inner pile wall.
In a second aspect of the invention, a construction method for constructing the rigid rib wall type pile wall foundation pit supporting structure is provided.
The general and preferred technical scheme of the invention achieves a plurality of technical effects:
1. the construction period is short, and compared with an inner support supporting structure, the rigid rib wall type pile wall foundation pit supporting structure is simple in process, free of cross operation, influence on earthwork construction and influence on construction of a main structure, the total construction period of foundation pit supporting, earthwork excavation and underground structure construction is shortened by about 3-12 months, and the construction period of a project is greatly shortened.
2. Greatly reduces the project fund operation cost of the owners and greatly improves the operation efficiency of developing the fund.
3. The rigid rib wall type pile wall foundation pit supporting structure is high in overall rigidity, clear and definite in stress, safe and reliable.
4. The main components of the rigid rib wall type pile wall foundation pit supporting structure are constructed on the ground surface in advance, so that the earthwork construction is not influenced, the efficiency of the earthwork construction is not reduced, secondary transportation is not needed in the earthwork operation, and the construction cost of the earthwork is greatly reduced.
5. The rigid rib wall type pile wall foundation pit supporting structure does not occupy the internal space of the underground structure, and the engineering pile can be implemented at the bottom of the foundation pit after the foundation pit is excavated, so that the type selection of the engineering pile is facilitated, and the construction quality of the engineering pile can be guaranteed.
6. Rigid rib wall formula pile wall underground structure supporting construction does not occupy underground structure inner space, does not receive simultaneously to trade to prop, tear open the influence that props, and underground structure construction working face is big, and the efficiency of construction is high, and underground structure construction cost reduces by a wide margin.
7. The rigid rib wall type pile wall foundation pit supporting structure is simple in process and convenient to construct, and the foundation pit earthwork can be directly excavated to the basement after the main components are constructed on the ground surface.
8. The rigid ribbed wall type pile wall foundation pit supporting structure has the advantages that the quality is reliable, the construction quality is convenient to control, and the main components of the rigid ribbed wall type pile wall foundation pit supporting structure are cast-in-place piles, secant piles, underground continuous walls and the like constructed on the ground surface, so that the construction quality is controllable and reliable, and the inspection and acceptance are very convenient.
Drawings
Fig. 1 is a schematic perspective view of a pile wall foundation pit supporting structure.
Figure 2 is a schematic plan view of a pile wall excavation supporting structure.
Figure 3 is a plan view illustration of a pile wall foundation pit support structure with rigid rib walls extending into the pit.
Fig. 4 is a schematic longitudinal section of an outer pile wall in a pile wall foundation pit supporting structure.
Fig. 5 is a schematic longitudinal section of an inner pile wall in a pile wall foundation pit support structure.
Fig. 6 is a cross-sectional view of a rigid rib-free wall in a pile wall foundation pit support structure.
Figure 7 is a cross-sectional schematic view of a pile wall foundation pit support structure having rigid ribbed walls.
Figure 8 is a schematic cross-sectional view of a pile wall foundation pit support structure with rigid rib walls extending into the foundation pit.
Fig. 9 is a detailed view of the rigid rib wall of the pile wall foundation pit supporting structure.
Fig. 10 is an elevation view of an inboard side rail of the pile wall foundation pit support structure.
Figures 11a to 11d are schematic views of several embodiments of top support members of a pile wall foundation pit support structure.
Description of reference numerals: 1. an outer pile wall; 2. an inner pile wall; 3. a rigid ribbed wall; 4. a top stringer; 5. a top cross beam; 6. an inboard side rail; 7. a top support member; 8. the ground is elevated; 9. the pit bottom is elevated; 10. the top elevation of the foundation bottom plate; 11. basement outer wall.
Detailed Description
Fig. 1 is a schematic perspective view of an exemplary embodiment of a rigid ribbed-wall piling wall foundation pit supporting structure of the present invention. The support structure may be arranged at one or more sides or even at all sides of the foundation pit. The main body part comprises an outer pile wall 1, an inner pile wall 2, a rigid rib wall 3, a top longitudinal beam 4 and a top cross beam 5. The outer pile walls 1 are arranged along the outer sides of the outer side lines of the underground structure, and the central line of each outer pile wall 1 is parallel to the outer side lines of the foundation pit. The inner pile wall 2 is arranged between the outer side of the outer side line of the underground structure and the outer pile wall 1, and the central line of each inner pile wall 2 is parallel to the central line of the outer pile wall 1. The rigid rib wall 3 is arranged between the outer pile wall 1 and the inner pile wall 2 and is in rigid connection with the outer pile wall 1 and the inner pile wall 2, and the direction of the central line of the rigid rib wall 3 is perpendicular to the direction of the central line of the outer pile wall 1 and the direction of the central line of the inner pile wall 2. The top longitudinal beam 4 is arranged at the top of the outer pile wall 1 and the top of the inner pile wall 2, so that the top of the outer pile wall 1 and the top of the inner pile wall 2 are rigidly connected. The top cross beam 5 is arranged between the top longitudinal beam 4 at the upper part of the outer pile wall 1 and the top longitudinal beam 4 at the upper part of the inner pile wall 2 and is in rigid connection with the top longitudinal beams 4 at the upper parts of the outer pile wall 1 and the inner pile wall 2, and the central line direction of the top cross beam 5 is vertical to the central line direction of the outer pile wall 1 and the central line direction of the inner pile wall 2.
According to the technical scheme, the rigid foundation pit supporting structure is formed by combining the outer pile wall 1, the inner pile wall 2, the rigid rib wall 3, the top longitudinal beam 4 and the top cross beam 5. The foundation pit supporting structure can also be combined with a steel structure, a reinforced concrete structure, a brick concrete structure and a masonry structure outside the supporting structure to form a foundation pit supporting system.
The spacing between the inner and outer pile walls may be from 2 to 30 times its diameter or thickness.
The outer pile wall 1 and the inner pile wall 2 can be formed in various ways, such as a cast-in-place reinforced concrete pile, a cast-in-place pile and plain concrete pile interlocking pile (see fig. 2), a cast-in-place pile and jet grouting pile interlocking pile, a cast-in-place pile and mixing pile interlocking pile or a reinforced concrete underground continuous wall. In the case of using the occlusive pile, as shown in fig. 4 and 5, the elevation of the pile top of the jet grouting pile, the mixing pile, the plain concrete pile and the like occluded with the cast-in-place pile can be lower than the elevation of the pile top of the cast-in-place pile, and the elevation of the pile bottom of the jet grouting pile, the mixing pile, the plain concrete pile and the like can also be higher than the elevation of the pile bottom of the cast-in-place pile, so that materials are saved, and the supporting capability of a supporting structure cannot be obviously reduced. The thickness of the continuous wall or the diameter of the cast-in-place pile can be 400-2500mm, and the concrete strength grade is not less than C25. The inner pile wall 2 may be post-grouted if desired.
In this embodiment, the rigid ribbed wall 3 is a reinforced concrete underground continuous wall or a plain concrete underground continuous wall. As a modification, a form of a reinforced concrete interlocking pile, a plain concrete interlocking pile, a cast-in-place pile and plain concrete pile interlocking pile, a cast-in-place pile and jet grouting pile interlocking pile, a plain concrete pile and jet grouting pile interlocking pile, or the like may be used. Both of these embodiments ensure the rigidity of the rib wall and the rigid connection to the pile wall. The rigid ribbed wall 3 adopts a reinforced concrete cast-in-place pile member or a plain concrete pile member, the diameter of the rigid ribbed wall is 400-1500mm, and the concrete strength grade is not less than C5; if the reinforced concrete underground continuous wall or plain concrete underground continuous wall component is adopted, the width is 400-1500mm, and the concrete strength grade is not less than C5.
As shown in fig. 3, the rigid rib wall 3 extends a certain width toward the inside of the inner pile wall 2, if necessary. Such extension may significantly increase the lateral bending stiffness and rollover resistance of the supporting structure. In this case, the extended portion should avoid the position of the columns and beams of the building and the engineering piles.
The top longitudinal beams 4 and the top cross beams 5 are usually made of reinforced concrete members, and the strength grade of the concrete is not less than C25.
As shown in fig. 10, one or more inner longitudinal beams 6 are preferably provided between or inside the inner pile walls 2, the inner longitudinal beams 6 are reinforced concrete members or steel members, and the inner longitudinal beams 6 may occupy the entire thickness or a part of the thickness of the inner pile walls. The inner stringers 6 enhance the overall force-bearing properties of the cast-in-place pile and are particularly useful in embodiments employing cast-in-place piles.
In the case where the supporting construction body is lower than the ground, a top supporting member may be further provided on the top of the supporting construction body. Fig. 11 shows several embodiments of the top support member, fig. 11a the top support member being a cantilever part of the outer pile wall 1 or the inner pile wall 2, fig. 11b being in the form of a soil nailing wall 7, fig. 11c being in the form of a sampling slope protection surface 71, and fig. 11d being a retaining wall 72. Besides, the concrete can also be a retaining pile or a retaining wall.
Optionally, a plate or a beam plate is arranged at the top of the rigid rib wall type pile wall foundation pit supporting structure to form a construction road or a construction operation surface.
In order to construct the rigid rib wall type pile wall foundation pit supporting structure, the construction method can comprise the following construction steps:
1) constructing an outer pile wall 1, an inner pile wall 2 and a rigid rib wall 3 on the ground surface;
2) constructing a top longitudinal beam 4 and a top cross beam 5;
3) and excavating the earthwork layer by layer to the elevation of the substrate.
In an exemplary embodiment, the construction steps are as follows:
1) constructing an outer pile wall 1, an inner pile wall 2 and a rigid rib wall 3 on the ground surface;
2) constructing a top supporting member 7;
3) constructing a top longitudinal beam 4 and a top cross beam 5;
4) excavating earthwork layer by layer to the construction elevation of the first inner side longitudinal beam 6;
5) constructing a first inner side longitudinal beam 6;
6) repeating the process from the fourth step to the fifth step until all the inner side longitudinal beams 6 are constructed;
7) and excavating the earthwork to the elevation of the basement.
Claims (13)
1. The utility model provides a stake wall underground structure supporting construction, sets up in the underground structure outside line to the inboard usable space of red line for building, its characterized in that: mainly comprises an outer pile wall (1), an inner pile wall (2), a rigid rib wall (3), a top longitudinal beam (4) and a top cross beam (5), wherein,
the outer pile wall (1) is arranged along the outer side of the outer side line of the underground structure;
the inner pile walls (2) are arranged between the outer sides of the outer side lines of the underground structure and the outer pile walls (1), and the center lines of the inner pile walls (2) are basically parallel to the center line of the outer pile wall (1);
the rigid rib wall (3) is rigidly connected between the outer pile wall (1) and the inner pile wall (2) and is vertical to the outer pile wall (1) and the inner pile wall (2);
the top longitudinal beam (4) is arranged at the tops of the outer pile wall (1) and the inner pile wall (2), and a rigid connection is formed at the tops of the outer pile wall (1) and the inner pile wall (2);
the top cross beam (5) is arranged between the top longitudinal beam (4) at the upper part of the outer pile wall (1) and the top longitudinal beam (4) at the upper part of the inner pile wall (2) and is in rigid connection with the top longitudinal beam (4) at the upper parts of the outer pile wall (1) and the inner pile wall (2).
2. The pile wall foundation pit supporting structure of claim 1, wherein: the pile wall structure is characterized by further comprising inner side longitudinal beams (6) arranged between the inner pile walls (2) or on the inner side, and one or more than one channel is/are arranged along the length direction of the inner pile walls (2), so that the inner pile walls (2) form one or more than one rigid connection.
3. The pile wall foundation pit supporting structure of claim 1, wherein: the combined supporting structure is formed by a foundation pit supporting structure formed by combining the outer pile wall (1), the inner pile wall (2), the rigid rib wall (3), the top longitudinal beam (4) and the top cross beam (5) and a combined supporting structure formed by a local steel structure, a reinforced concrete structure, a brick concrete structure and a masonry structure.
4. The pile wall foundation pit supporting structure of claim 1, wherein: the rigid rib wall (3) extends out of the inner side of the inner pile wall (2).
5. The pile wall foundation pit supporting structure of claim 1, wherein: the pile wall foundation pit supporting structure is arranged on one side or multiple sides or all sides of the foundation pit.
6. The pile wall foundation pit supporting structure of claim 1, wherein: the outer pile wall (1) and the inner pile wall (2) adopt reinforced concrete cast-in-place piles, cast-in-place piles and plain concrete pile secant piles, cast-in-place piles and jet grouting pile secant piles, cast-in-place piles and mixing pile secant piles and reinforced concrete underground continuous walls.
7. The pile wall foundation pit supporting structure of claim 1, wherein: the rigid ribbed wall (3) adopts a reinforced concrete secant pile, a plain concrete secant pile, a cast-in-place pile and plain concrete pile secant pile, a cast-in-place pile and jet grouting pile secant pile, a plain concrete pile and jet grouting pile secant pile, a reinforced concrete underground continuous wall and a plain concrete underground continuous wall.
8. The pile wall foundation pit supporting structure of claim 2, wherein: the top longitudinal beam (4) and the top cross beam (5) adopt reinforced concrete members, and the inner side longitudinal beam (6) adopts reinforced concrete members or steel members.
9. The pile wall foundation pit supporting structure of claim 1, wherein: and an additional top supporting member (7) arranged on the upper part of the outer pile wall (1) or the upper part of the inner pile wall (2).
10. The pile wall foundation pit supporting structure of claim 9, wherein: the top supporting component (7) is a cantilever part of the outer pile wall (1), a cantilever part of the inner pile wall (2), a soil nailing wall, a composite soil nailing wall, a slope protection pile, a slope laying protection surface or a retaining wall.
11. The pile wall foundation pit supporting structure of claim 1, wherein: the inner pile wall (2) is subjected to post grouting treatment as required.
12. The construction method for constructing the pile wall foundation pit supporting structure of claim 1, characterized by comprising the following construction steps:
1) constructing an outer pile wall (1), an inner pile wall (2) and a rigid rib wall (3) on the ground surface;
2) constructing a top longitudinal beam (4) and a top cross beam (5);
3) and excavating the earthwork layer by layer to the elevation of the substrate.
13. The construction method of a pile wall foundation pit supporting structure according to claim 2, characterized by comprising the following construction steps:
1) constructing an outer pile wall (1), an inner pile wall (2) and a rigid rib wall (3) on the ground surface;
2) constructing a top supporting member (7);
3) constructing a top longitudinal beam (4) and a top cross beam (5);
4) excavating earthwork layer by layer to the construction elevation of the first inner side longitudinal beam (6);
5) constructing a first inner side longitudinal beam (6);
6) repeating the process from the fourth step to the fifth step until all the inner side longitudinal beams (6) are constructed;
7) and excavating the earthwork to the elevation of the basement.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110884092.4A CN113404060A (en) | 2021-08-03 | 2021-08-03 | Rigid rib wall type pile wall foundation pit supporting structure and construction method |
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| CN202110884092.4A CN113404060A (en) | 2021-08-03 | 2021-08-03 | Rigid rib wall type pile wall foundation pit supporting structure and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114411762A (en) * | 2022-02-28 | 2022-04-29 | 建研地基基础工程有限责任公司 | Rear-anchor type rigid foundation pit supporting structure and construction method |
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2021
- 2021-08-03 CN CN202110884092.4A patent/CN113404060A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114411762A (en) * | 2022-02-28 | 2022-04-29 | 建研地基基础工程有限责任公司 | Rear-anchor type rigid foundation pit supporting structure and construction method |
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