CN210738590U - Underpinning structure of tunnel lower-penetrating pile foundation - Google Patents
Underpinning structure of tunnel lower-penetrating pile foundation Download PDFInfo
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- CN210738590U CN210738590U CN201921043780.2U CN201921043780U CN210738590U CN 210738590 U CN210738590 U CN 210738590U CN 201921043780 U CN201921043780 U CN 201921043780U CN 210738590 U CN210738590 U CN 210738590U
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Abstract
The application discloses underpinning structure of passing pile foundation under tunnel includes: a pile foundation; the pile foundation penetrates through the primary support lining layer and is fixedly connected with the primary support lining layer; the profile steel concrete arch is arranged on the inner side of the primary support lining layer and comprises a plurality of profile steel frameworks and a first concrete layer wrapping the profile steel frameworks, and the profile steel frameworks are fixedly connected with the pile foundation; and a secondary lining layer clinging to the inner side of the profile steel concrete cover arch. The utility model provides a underpinning structure of passing pile foundation under tunnel has the advantage that is difficult for subsiding.
Description
Technical Field
The application relates to tunnel construction, especially relates to a underpinning structure of passing pile foundation under tunnel.
Background
With the development of national economy, domestic traffic networks have been greatly improved in recent thirty years, railways and highways are spread throughout provinces and cities, particularly subway tunnels are already built or prepared in partial cities of China, and the tunnels need to be built to pass through urban areas in the process of building the subways. The underpinning structure is generally adopted to replace arches in the process of building the tunnel, the quality of the underpinning structure directly has great influence on the safety of the whole structure of the tunnel, the underpinning structure of the tunnel in the prior art is usually a reinforcing mesh and concrete, the rigidity margin is not large, the borne quality needs to be calculated carefully, otherwise the underpinning structure is easy to deform under overload for a long time to cause settlement.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiments of the present application are expected to provide a underpinning structure of a tunnel underpass pile foundation, so as to solve the problem that the underpinning structure is easy to deform and cause settlement.
In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:
an underpinning structure of a tunnel underpinning pile foundation, comprising: a pile foundation; the pile foundation penetrates through the primary support lining layer and is fixedly connected with the primary support lining layer; the profile steel concrete arch is arranged on the inner side of the primary support lining layer and comprises a plurality of profile steel frameworks and a first concrete layer wrapping the profile steel frameworks, and the profile steel frameworks are fixedly connected with the pile foundation; and a secondary lining layer clinging to the inner side of the profile steel concrete cover arch.
Furthermore, the steel skeleton comprises a plurality of steel skeleton sections, and each steel skeleton section comprises a steel section and first connecting pieces respectively fixed at two ends of the steel section; adjacent between the shaped steel skeleton section, last one the first connecting piece and the next of shaped steel skeleton section the first connecting piece fastening connection of shaped steel skeleton section is a plurality of shaped steel skeleton section fixed connection is the arch.
Further, the first connecting piece is fixedly welded with the section steel; and/or the first connecting piece of the previous section of the steel skeleton is connected with the first connecting piece of the next section of the steel skeleton through bolts between the adjacent sections of the steel skeleton; and/or, the section steel framework section is welded and fixed with the pile foundation.
Furthermore, the first concrete layer that shaped steel skeleton both ends were wrapped up is to the inboard thickening and is the binding off form.
Furthermore, the profile steel concrete cover arch further comprises a plurality of second connecting pieces, and the plurality of profile steel frameworks are fixedly connected through the second connecting pieces.
Further, the second connecting pieces are at least three fixed steel frameworks, and at least one group of two adjacent second connecting pieces are arranged in a staggered mode in the width direction of the tunnel.
Furthermore, the underpinning structure comprises a reinforcing layer, the reinforcing layer is formed by hardening a reinforcing slurry mixed stratum injected to an external stratum, and the reinforcing layer is arranged on the outer side of the primary support lining layer.
Further, the underpinning structure comprises a plurality of grouting pipes for injecting reinforcing slurry to form the reinforcing layer, the grouting pipes are tightly attached to the outer side of the primary support lining layer, the grouting pipes are distributed in the angle range A of the vault of the primary support lining layer, and the angle range A is more than or equal to 60 degrees and less than or equal to 150 degrees.
Further, the primary support lining layer includes that steelframe, the parcel that the reinforcing bar net formed are in second concrete layer and lock foot stock on the steelframe, the pile foundation lateral wall is including the fluting, the fluting confession the steelframe stretches into it is fixed to weld in the pile foundation, it is fixed to lock foot stock steelframe and outside stratum.
Further, the section steel section is an I-beam; and/or the first concrete layer is a C35 concrete layer; and/or the second concrete layer is a C35 concrete layer; and/or the secondary lining layer is of a concrete structure.
The beneficial effects are that:
compared with the prior art, the underpinning structure of the tunnel underpass pile foundation is characterized in that the section steel concrete arch is arranged on the inner side of the primary support lining to realize the connection between the pile foundation and the secondary lining layer, the section steel concrete arch comprises a plurality of section steel frameworks and a first concrete layer wrapping the section steel frameworks, the section steel frameworks have stronger rigidity than a reinforcing steel bar net and can effectively bear larger mass, the assembly of the section steel frameworks in the limited space tunnel is more convenient, the welding of the section steel frameworks and the pile foundation is better than the multi-point welding of the traditional reinforcing steel bar net and the pile foundation, and the welding strength is better; the first concrete layer is attached to a plurality of steel skeleton frames to strengthen the overall toughness, so that the underpinning structure is not easy to deform, and finally the occurrence of the tunnel settlement phenomenon is reduced.
Drawings
Fig. 1 is a schematic cross-sectional view of a underpinning structure of a tunnel underpinning pile foundation according to an embodiment of the present application;
FIG. 2 is a schematic sectional structure view of assembly of a primary support lining layer and a pile foundation;
FIG. 3 is a schematic sectional view of a structural member of a steel concrete shell arch;
fig. 4 is a view of a portion of fig. 1 taken along direction B, in which the reinforcement layer, the grout pipe, the primary backing layer, and the first concrete layer are omitted.
Detailed Description
It should be noted that, in the case of conflict, the technical features in the examples and examples of the present application may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the present application and should not be construed as an improper limitation of the present application.
In the description of the embodiments of the present application, the "up", "down", "left", "right", "front", "back" orientation or positional relationship is based on the orientation or positional relationship shown in fig. 1, it is to be understood that these orientation terms are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present application.
As shown in fig. 1 and 4, a underpinning structure of a tunnel underpass pile foundation comprises a pile foundation 1, an arched primary lining layer 2, a profile steel concrete cover arch 3 arranged on the inner side of the primary lining layer 2 and a secondary lining layer 4 tightly attached to the inner side of the profile steel concrete cover arch 3, wherein the secondary lining layer 4 is a concrete structure and serves as a final bearing arch of the tunnel, the pile foundation 1 is configured to be fixed in an external stratum, and other components such as the primary lining layer 2 and the profile steel concrete cover arch 3 can be connected with the pile foundation 1 so as to be fixed; the pile foundation 1 penetrates through the primary support lining layer 2 and is fixedly connected with the primary support lining layer 2, the section steel concrete cover arch 3 comprises a plurality of section steel frameworks 31 arranged side by side along the extending direction of the tunnel and a first concrete layer 32 wrapping the section steel frameworks 31, and the section steel frameworks 31 have stronger rigidity and can effectively bear larger mass; the steel skeleton 31 is fixedly connected with the bottom end of the pile foundation 1, the fixing mode is preferably welding, and compared with the traditional multi-spot welding of a reinforcing mesh and the pile foundation, the welding of the steel skeleton 31 and the pile foundation 1 has better welding strength and fewer welding points; first concrete layer 32 is attached to and is strengthened holistic toughness between a plurality of shaped steel frameworks 31 for underpinning structure non-deformable has finally reduced the emergence of tunnel settlement phenomenon.
In a preferred embodiment, as shown in fig. 1, 3 and 4, the steel skeleton 31 comprises a plurality of steel skeleton sections 313, each steel skeleton section 313 comprises a steel section 311 and first connecting members 312 respectively fixed at two ends of the steel section 311, and the first connecting members 312 and the steel sections 311 can be welded, rigidly connected and corrosion resistant; between adjacent steel framework sections 313, the first connecting piece 312 of the previous steel framework section 313 is fixedly connected with the first connecting piece 312 of the next steel framework section 313, the first connecting piece 312 can be a connecting flange generally, the connecting mode of the first connecting piece 312 and the first connecting piece 312 can be bolt connection, rivet connection or welding, and the bolt connection is recommended in consideration of the narrow space environment of the tunnel, which is not beneficial to the bringing of welding equipment and riveting tools, so that the operation is simple and the fixing performance is good; a plurality of the steel skeleton sections 313 are fixedly connected in an arch shape to constitute the steel skeleton 31.
It should be noted that the section steel framework section 313 can be assembled outside in advance and then transported into the tunnel independently, compared with the traditional underpinning structure of a reinforced concrete beam-column system, the section steel framework 31 in the tunnel in a limited space is assembled more conveniently and rapidly, the forming period of the section steel framework 31 can be shortened effectively, and then concrete is paved rapidly to wrap the section steel framework 31 to form the first concrete layer 32, so that the period of the section steel concrete arch 3 is shortened greatly, and the construction under the tunnel environment is facilitated.
In actual operation, section steel section 311 is usually the I-beam, and the trade mark can be I22 type steelframe, and the rigidity is good and welding performance is good, is applicable to the complicated service environment in tunnel, and section steel skeleton 31 can adopt welded connection with the fixed of pile foundation 1, usually by being located the fixed with pile foundation 1 welding of section steel skeleton section 313 of vault, and bearing performance is good, fixed firm and rigidity is good.
In a preferred embodiment, as shown in fig. 1 and 3, the first concrete layer 32 wrapped by the two ends of the steel reinforced concrete frame 31 is thickened inwards to form a closed end, so that the two ends of the steel reinforced concrete arch 3 away from the arch crown are closed, and the force is applied to the inner side of the steel reinforced concrete arch 3, thereby further constructing to form the secondary lining layer 4.
In a preferred embodiment, as shown in fig. 4, the steel reinforced concrete arch 3 further includes a plurality of second connecting members 33, the second connecting members 33 may be steel plates, steel rods or steel blocks, the plurality of steel frameworks 31 are fixedly connected by the second connecting members 33, and the fixing manner may be welding, so that the fixing strength is good and stable. The adjacent steel frameworks 31 are fixed with each other through the second connecting pieces 33 to form a rigid whole, and a first concrete layer 32 is formed by laying concrete, so that the overall rigidity and toughness of the underpinning structure are improved.
In a preferred embodiment, as shown in fig. 4, the second connecting members 33 fix at least three steel frameworks 31, and at least one set of two adjacent second connecting members 33 are arranged in a staggered manner along the width direction of the tunnel.
Specifically, at least a part of the steel frameworks 31 connected with the two second connecting members 33 are overlapped, for convenience of description, characters are added after part names to show differences among individuals, the second connecting members 33a are respectively fixedly connected with the steel frameworks 31a, the steel frameworks 31b and the steel frameworks 31c, the second connecting members 33b are respectively fixedly connected with the steel frameworks 31b, the steel frameworks 31c and the steel frameworks 31d, wherein the steel frameworks 31b and the steel frameworks 31c are overlapped, the fixing points of the second connecting members 33a on the steel frameworks 31b and the steel frameworks 31c are points e and h, the fixing points of the second connecting members 33b on the steel frameworks 31b and the steel frameworks 31c are points f and g, polygonal fixing areas are formed between the points e, h and f, and the rigidity among the steel frameworks 31 is effectively prevented from deflecting and enhanced, and then the first concrete layer 32 is attached among the plurality of steel frameworks 31 to strengthen the overall toughness, so that the underpinning structure has good rigidity and is not easy to deform.
In a preferred embodiment, as shown in fig. 1, the underpinning structure further comprises a plurality of grouting pipes 6 and a reinforcing layer 5, wherein the reinforcing layer 5 is formed by mixing ground slabs of reinforcing grout injected into an external stratum, and the reinforcing layer 5 is arranged on the outer side of the primary supporting lining layer 2 as a reliable bearing arch of the stratum above the arch crown of the tunnel and an improved soil body, so that a supporting effect is achieved at the initial stage of tunnel excavation; it should be noted that the reinforcing layer 5 is generally injected with reinforcing slurry by pumping, flows through a pipeline and then seeps out of the grouting pipe 6 to the external stratum, the grouting pipe 6 is tightly attached to the outer side of the primary support lining layer 2 and is distributed in the angle range of A of the vault of the primary support lining layer 2, A is more than or equal to 60 degrees and less than or equal to 150 degrees, so that the penetration range of the reinforcing slurry is limited to be concentrated on the vault part which is easy to collapse, and the reinforcing function of the reinforcing layer 5 is utilized to the maximum.
In a preferred embodiment, as shown in fig. 1 and 2, the primary support lining layer 2 comprises a steel frame 21 formed by a steel bar mesh, a second concrete layer 22 and a foot-locking anchor rod 23, the side wall of the pile foundation 1 comprises a slot (not shown in the figure), the slot can allow the steel frame 21 to extend into the pile foundation 1, and a main rib (not shown in the figure) in the pile foundation 1 can be welded and fixed with the steel bar of the steel frame 21; under the condition that the steel frame 21 and the pile foundation 1 are not fixed, the steel frame 21 and an external stratum are preliminarily fixed through the foot locking anchor rods 23 so as to avoid loosening and shaking in construction and installation; after the steel frame 21 and the pile foundation 1 are rigidly fixed, concrete is paved to form a second concrete layer 22 which is wrapped on the steel frame 21, so that the toughness of the primary support lining layer 2 is improved, and a foundation is provided for building a subsequent section steel concrete cover arch 3 and a secondary lining layer 4; the second concrete layer 22 can be a C35 concrete layer, has good toughness and corrosion resistance, and is suitable for the complex use environment of the tunnel.
The various embodiments/implementations provided herein may be combined with each other without contradiction.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a tunnel is underpinned structure of pile foundation down, its characterized in that includes:
a pile foundation (1);
the pile foundation (1) penetrates through the primary support lining layer (2) and is fixedly connected with the primary support lining layer (2);
the profile steel concrete cover arch (3) is arranged on the inner side of the primary support lining layer (2), the profile steel concrete cover arch (3) comprises a plurality of profile steel frameworks (31) and a first concrete layer (32) wrapping the profile steel frameworks (31), and the profile steel frameworks (31) are fixedly connected with the pile foundation (1);
and a secondary lining layer (4) clinging to the inner side of the section steel concrete cover arch (3).
2. The underpinning structure of claim 1, wherein: the steel skeleton (31) comprises a plurality of steel skeleton sections (313), and each steel skeleton section (313) comprises a steel section (311) and first connecting pieces (312) respectively fixed at two ends of the steel section (311); between adjacent shaped steel skeleton section (313), last one first connecting piece (312) and the next of shaped steel skeleton section (313) first connecting piece (312) fastening connection, it is a plurality of shaped steel skeleton section (313) fixed connection is the arch.
3. The underpinning structure of claim 2, wherein: the first connecting piece (312) is fixedly welded with the section steel section (311);
and/or the first connecting piece (312) of the previous section (313) of the section steel skeleton is connected with the first connecting piece (312) of the next section steel skeleton (313) through bolts between the adjacent sections (313) of the section steel skeleton;
and/or the section steel framework section (313) is welded and fixed with the pile foundation (1).
4. Underpinning structure according to any one of claims 1 to 3, characterized in that: the first concrete layer (32) wrapped at the two ends of the profile steel framework (31) is thickened inwards to form a closed-up shape.
5. Underpinning structure according to any one of claims 1 to 3, characterized in that: the profile steel concrete cover arch (3) further comprises a plurality of second connecting pieces (33), and the profile steel frameworks (31) are fixedly connected through the second connecting pieces (33).
6. The underpinning structure of claim 5, wherein: the second connecting pieces (33) are at least fixed three steel section frames (31), and at least one group of two adjacent second connecting pieces (33) are arranged in a staggered mode along the width direction of the tunnel.
7. Underpinning structure according to any one of claims 1 to 3, characterized in that: the underpinning structure comprises a reinforcing layer (5), wherein the reinforcing layer (5) is formed by hardening a reinforcing slurry mixed stratum injected into an external stratum, and the reinforcing layer (5) is arranged on the outer side of the primary support lining layer (2).
8. The underpinning structure of claim 7, wherein: the underpinning structure comprises a plurality of grouting pipes (6) used for injecting reinforcing slurry to form the reinforcing layer (5), wherein the grouting pipes (6) are tightly attached to the outer side of the primary support lining layer (2), the grouting pipes (6) are distributed in the angle range A of the vault of the primary support lining layer (2), and A is more than or equal to 60 degrees and less than or equal to 150 degrees.
9. Underpinning structure according to any one of claims 1 to 3, characterized in that: just prop up lining layer (2) and be in including steelframe (21), the parcel that the reinforcing bar net formed second concrete layer (22) and lock foot stock (23) on steelframe (21), pile foundation (1) lateral wall is including the fluting, the fluting confession steelframe (21) stretch into the welding is fixed in pile foundation (1), lock foot stock (23) are fixed steelframe (21) and outside stratum.
10. The underpinning structure of claim 9, wherein: the first concrete layer (32) is a C35 concrete layer;
and/or the second concrete layer (22) is a C35 concrete layer;
and/or the secondary lining layer (4) is of a concrete structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921043780.2U CN210738590U (en) | 2019-07-05 | 2019-07-05 | Underpinning structure of tunnel lower-penetrating pile foundation |
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| CN201921043780.2U CN210738590U (en) | 2019-07-05 | 2019-07-05 | Underpinning structure of tunnel lower-penetrating pile foundation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049232A (en) * | 2020-07-21 | 2020-12-08 | 中建二局装饰工程有限公司 | Arc-shaped structure and construction method thereof |
| CN112282770A (en) * | 2020-11-01 | 2021-01-29 | 湖南省水利水电勘测设计研究总院 | Construction method for pile-breaking type underpass existing supporting row pile |
| CN113174964A (en) * | 2021-05-06 | 2021-07-27 | 哈尔滨工业大学 | Frame-suspension pile supporting structure system for protecting subway tunnel and construction method thereof |
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2019
- 2019-07-05 CN CN201921043780.2U patent/CN210738590U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112049232A (en) * | 2020-07-21 | 2020-12-08 | 中建二局装饰工程有限公司 | Arc-shaped structure and construction method thereof |
| CN112049232B (en) * | 2020-07-21 | 2022-02-25 | 中建二局装饰工程有限公司 | Arc-shaped structure and construction method thereof |
| CN112282770A (en) * | 2020-11-01 | 2021-01-29 | 湖南省水利水电勘测设计研究总院 | Construction method for pile-breaking type underpass existing supporting row pile |
| CN112282770B (en) * | 2020-11-01 | 2022-08-12 | 湖南省水利水电勘测设计规划研究总院有限公司 | Construction method for pile-breaking type underpass existing supporting row pile |
| CN113174964A (en) * | 2021-05-06 | 2021-07-27 | 哈尔滨工业大学 | Frame-suspension pile supporting structure system for protecting subway tunnel and construction method thereof |
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