CN211228523U - Deep foundation pit combined support adjacent to existing building - Google Patents
Deep foundation pit combined support adjacent to existing building Download PDFInfo
- Publication number
- CN211228523U CN211228523U CN201921977153.6U CN201921977153U CN211228523U CN 211228523 U CN211228523 U CN 211228523U CN 201921977153 U CN201921977153 U CN 201921977153U CN 211228523 U CN211228523 U CN 211228523U
- Authority
- CN
- China
- Prior art keywords
- barrier layer
- foundation pit
- deep foundation
- existing building
- supporting structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The utility model provides a deep basal pit combination of neighbouring existing building is strutted, this combination is strutted and is included: the cast-in-place bored piles are arranged between the existing building and the deep foundation pit, and are arranged in a strip shape along the extending direction of the edge of the existing building to form a first blocking layer; the steel sheet piles are arranged along the periphery of the deep foundation pit to form a second barrier layer, and a first support structure serving as a transverse support is arranged on the inner wall of the second barrier layer; the first supporting structure comprises a first enclosing purlin horizontally arranged along the inner wall of the second barrier layer, and at least one cross brace is arranged on the first enclosing purlin; the lengths of the first barrier layer and the second barrier layer are not less than the depth of the deep foundation pit; the utility model discloses a double-deck separation structure, under the prerequisite of guaranteeing the construction progress, improve supporting construction's supporting strength to reduce the safe risk of neighbouring existing building deep basal pit construction.
Description
Technical Field
The utility model relates to a deep basal pit supporting construction, specific theory relates to a deep basal pit combination of neighbouring existing building is strutted.
Background
The foundation pit is used as the foundation of building, and the foundation pit engineering mainly comprises the design and construction of a foundation pit supporting system and the excavation of earthwork, so that the foundation pit is a system engineering with strong comprehensiveness. It requires close cooperation between geotechnical engineering and structural engineering technicians. The deep foundation pit refers to a project which has an excavation depth of more than 5 meters (including 5 meters), or has a depth of less than 5 meters, but has particularly complicated geological conditions, surrounding environments and underground pipelines.
Along with the continuous and rapid development of high-speed railways in China, more and more railway bridges are adjacent to or span an existing line, the construction of the overpass bridge needs to consider the safety of the construction and the operation safety of the existing line, and the construction of the deep foundation pit of the conventional adjacent structure usually adopts support modes such as a steel sheet pile, an underground continuous wall, an AB secant pile and a cement mixing pile, wherein the support modes such as the underground continuous wall, the AB secant pile and the cement mixing pile have high cost and slow construction progress; although the steel sheet pile support is easy to construct, the soil pressure resistance is weak, and therefore, when the steel sheet pile support is constructed adjacent to an existing building, how to improve the support strength of a support structure on the premise of ensuring the construction progress is the current technical difficulty.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model aims at providing a deep basal pit combination of neighbouring existing building is strutted, reduces the safety risk of neighbouring existing building deep basal pit construction through double-deck separation structure.
Based on the above-mentioned purpose, the utility model provides a deep basal pit combination of neighbouring existing building is strutted, and this combination is strutted and is included:
the cast-in-place bored piles are arranged between the existing building and the deep foundation pit, and are arranged in a strip shape along the extending direction of the edge of the existing building to form a first blocking layer;
the steel sheet piles are arranged along the periphery of the deep foundation pit to form a second barrier layer, and a first support structure serving as a transverse support is arranged on the inner wall of the second barrier layer; the first supporting structure comprises a first enclosing purlin horizontally arranged along the inner wall of the second barrier layer, and at least one first transverse support is arranged on the first enclosing purlin;
the lengths of the first barrier layer and the second barrier layer are not less than the depth of the deep foundation pit.
Preferably, the first barrier layer further comprises a crown beam connected to the top of each cast-in-situ bored pile, and the cast-in-situ bored piles are connected together by the crown beam, thereby increasing the barrier strength of the first barrier layer.
Preferably, the vertical distance between the first barrier layer and the edge of the deep foundation pit is 1-1.5 m.
Preferably, the first purlin is welded to the inner wall of the second barrier layer, and a support component is welded below the first purlin and used for dispersing the bearing force of the first purlin and the first cross brace to the second barrier layer.
Preferably, the diameter of the cast-in-situ bored pile is 1.25m, the distance between piles is 1.5m, the length of the pile is 16m, C30 concrete is adopted, and each cast-in-situ bored pile is a friction pile;
preferably, the steel sheet pile is a Larsen IV type steel sheet pile, the first purlin is double H400 section steel, and the cross brace is a phi 630 multiplied by 9mm spiral tube.
Preferably, a second supporting structure is further arranged on the inner wall of the second barrier layer, the second supporting structure is arranged below the first supporting structure and comprises a second enclosing purlin horizontally arranged along the inner wall of the second barrier layer, and at least one second transverse support is arranged on the second enclosing purlin;
the first supporting structure and the second supporting structure are uniformly arranged along the depth direction of the deep foundation pit.
Compared with the prior art, the beneficial effects of the utility model are that:
by means of the double-layer separation structure, on the premise that the construction progress is guaranteed, the supporting strength of the supporting structure is improved, and therefore the safety risk of construction of a deep foundation pit of an adjacent existing building is reduced;
through set up horizontal supporting layer in the second supporting layer, improved supporting construction's horizontal separation power, also increased the structural strength of deep basal pit lateral wall simultaneously.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
Fig. 1 is a schematic top view of an embodiment of the present invention;
fig. 2 is a schematic side view of an embodiment of the present invention;
100, deep foundation pit;
1. a first barrier layer; 2. a second barrier layer; 3. sealing bottom concrete;
11. drilling a cast-in-place pile; 12. a crown beam;
21. steel sheet piles; 22. a first purlin; 23. a second purlin;
221. corner brace; 222. a first cross brace;
231. and a second cross brace.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Furthermore, in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The embodiment provides a deep basal pit combination supporting adjacent to an existing building, and the supporting structure comprises:
the cast-in-situ bored piles 11 are arranged between the existing building and the deep foundation pit, and the cast-in-situ bored piles 11 are arranged in a strip shape along the extending direction of the existing building to form a first barrier layer 1;
the steel sheet piles 21 are arranged along the periphery of the deep foundation pit in a driving mode to form a second barrier layer 2, and a first supporting structure used as a transverse support is arranged on the inner wall of the second barrier layer 2; the first supporting structure comprises a first enclosing purlin 22 horizontally arranged along the inner wall of the second barrier layer 2, and at least one first cross brace 222 is arranged on the first enclosing purlin 22;
the lengths of the first barrier layer 1 and the second barrier layer 2 are not less than the depth of the deep foundation pit.
As a preferred embodiment, as shown in fig. 1, taking a polygonal deep foundation pit 100 as an example, the following structure is adopted in this embodiment: a plurality of cast-in-situ bored piles 11 are arranged between the existing building and the deep foundation pit to form a strip-shaped structure which is consistent with the edge shape of the deep foundation pit, and the strip-shaped structure forms a first barrier layer 1 which surrounds the edge part of the deep foundation pit; preferably, the diameter of each cast-in-situ bored pile 11 is 1.25m, the distance between piles is 1.5m, the length of each pile is 16m, C30 concrete is adopted, and each cast-in-situ bored pile 11 is a friction pile.
Preferably, the primary barrier layer 1 further comprises a crown beam 12 connected to the top of each cast-in-situ bored pile 11, and the cast-in-situ bored piles 11 are connected together by the crown beam 12, thereby increasing the barrier strength of the primary barrier layer 1.
Preferably, the vertical distance between the first barrier layer 1 and the edge of the deep foundation pit is 1-1.5 m.
As a preferred embodiment, as shown in fig. 1, two first cross braces 222 are disposed on the first purlin 22.
Preferably, the first purlin 22 is welded to the inner wall of the second barrier layer 2, and a support member is welded below the first purlin 22 and the first cross brace 222, and is used for dispersing the bearing force of the first purlin 22 and the first cross brace 222 to the second barrier layer 2.
As a preferred embodiment, as shown in fig. 2, in this embodiment, in combination with the depth of the deep foundation pit, a second support structure is disposed on the inner wall of the second barrier layer 2, the second support structure is disposed below the first support structure, and includes a second purlin 23 horizontally disposed along the inner wall of the second barrier layer 2, and at least one second cross brace 231 is disposed on the second purlin 23;
the first supporting structure and the second supporting structure are uniformly arranged along the depth direction of the deep foundation pit.
Preferably, the steel sheet pile 21 is a larsen IV type steel sheet pile 21, the first purlin 22 and the second purlin 23 are both made of double H400 section steel, and the cross brace is a spiral pipe with the diameter of 630 x 9 mm.
The embodiment also provides a construction method of the deep foundation pit combined support adjacent to the existing building, which comprises the following steps:
a plurality of cast-in-situ bored piles 11 are arranged between the existing building and the deep foundation pit and close to one side of the existing building to form a first barrier layer 1;
a circle of steel sheet piles 21 are arranged between the first barrier layer 1 and the deep foundation pit along the periphery of the deep foundation pit to form a second barrier layer 2;
excavation deep basal pit, along with the increase of deep basal pit degree of depth, combine the atress condition of second barrier layer 2, along the horizontal first bearing structure of installation of 2 inner walls of second barrier layer, be connected together each steel sheet pile 21 in with second barrier layer 2 through first bearing structure to increase separation intensity.
Preferably, after the first barrier layer 1 is drilled, a crown beam 12 is installed on the top of the first barrier layer, and the bored piles 11 are connected together by the crown beam 12, thereby increasing the barrier strength of the first barrier layer 1.
In a preferred embodiment, the vertical distance between the first barrier layer 1 and the edge of the deep foundation pit is 1-1.5 m.
Preferably, the first support structure is mounted by:
1) welding a support component below the installation position of each steel sheet pile 21;
2) welding a first purlin 22 between the top of the support component and the installation position of the steel sheet piles 21, and connecting the steel sheet piles 21 in the second barrier layer 2 together through the first purlin 22;
3) and a corner support 221 and a first cross support 222 are welded on the inner side of the first purlin 22, so that the support strength of the first purlin 22 is increased.
As a preferred embodiment, the construction method of the deep foundation pit combination support adjacent to the existing building further includes: after the first supporting structure is installed, a second supporting structure is transversely installed along the inner wall of the second blocking layer 2, wherein the first supporting structure and the second supporting structure are uniformly arranged along the depth direction of the deep foundation pit.
Taking the deep foundation pit structure adjacent to the existing building shown in fig. 1 as an example, the preferred implementation flow of the combined supporting and foundation pit excavation is as follows:
(1) 15 cast-in-situ bored piles 11 are arranged at a position 1.0 m-1.5 m away from the edge of a foundation pit and close to one side of an existing building, the diameter phi of each pile is 1.25m, the distance between every two piles is 1.5m, the length of each pile is 16m, C30 concrete is adopted and is friction piles, the tops of the piles are connected by crown beams 12, and the crown beams 12 are flush with or slightly higher than the original ground; thus, the existing building base is stabilized to form a first supporting layer;
(2) a circle of steel sheet piles 21 are arranged around the foundation pit in a driving mode, and the steel sheet piles 21 adopt Larsen IV-type steel sheet piles to form a second supporting layer;
(3) after the supporting construction of the steel sheet pile 21 is completed and the strength of a drilling protective pile body reaches the design strength, excavating a foundation pit, installing a first supporting structure, namely a first enclosing purlin 22 according to the stress calculation of the steel sheet pile 21 along the increase of the depth of the foundation pit, wherein the first enclosing purlin 22 is made of double H400 section steel, firstly welding brackets (supporting parts) at the installation position of the enclosing purlin, then installing the enclosing purlin along the inner wall of the steel sheet pile 21 for welding, then welding four-corner angle supports 221, and using phi 630 multiplied by 9mm spiral pipes for the angle supports 221;
(4) two first cross braces 222 are welded on the inner side of the first purlin 22, and the first cross braces 222 adopt phi 630 multiplied by 9mm spiral pipes;
(5) after the construction of the first enclosing purlin 22, the corner brace 221 and the cross brace is completed, earth excavation is continued, and a second supporting structure, namely a second enclosing purlin 23, the corner brace 221 and a second cross brace 231 is installed at the designed position;
(6) and when the foundation pit is excavated to the designed elevation of the bottom sealing concrete 3, seepage-proofing and leakage-stopping, and pouring C20 bottom sealing concrete with the thickness of 20 cm.
According to the embodiment, the supporting strength of the supporting structure is improved through the double-layer barrier structure on the premise of ensuring the construction progress, so that the safety risk of construction of the deep foundation pit of the adjacent existing building is reduced; in addition, through set up horizontal supporting layer in the second supporting layer, improved supporting construction's horizontal separation power, also increased the structural strength of deep basal pit lateral wall simultaneously.
The combined supporting form of the bored pile and the steel sheet pile in the embodiment has the advantages of simple construction process and easiness in operation, ensures the construction safety of the deep foundation pit, and effectively prevents the interference of the excavation of the deep foundation pit on the existing building. Compare in support modes such as underground continuous wall, AB secant pile, cement mixing pile expense height, progress slow, non-used repeatedly, the steel sheet pile not only can be directly purchased or leased from market, and it is convenient, quick to insert and beat in addition, can pull out reuse after the construction is accomplished, can effectively practice thrift the expense. In addition, the soil taking amount and the concrete using amount can be greatly reduced, the land resource is effectively protected, the social benefit is remarkable, and the method has wide application prospect and popularization value.
Further, it should be noted that:
in the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the spirit and scope of the present invention, and that any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.
Claims (7)
1. A deep foundation pit combined support adjacent to an existing building is characterized by comprising:
the cast-in-situ bored piles (11) are arranged between the existing building and the deep foundation pit, and the cast-in-situ bored piles (11) are arranged in a strip shape along the extending direction of the edge of the existing building to form a first barrier layer (1);
the steel sheet piles (21) are arranged along the periphery of the deep foundation pit to form a second barrier layer (2), and a first supporting structure used as a transverse support is arranged on the inner wall of the second barrier layer (2); the first supporting structure comprises a first enclosing purlin (22) horizontally arranged along the inner wall of the second barrier layer (2), and at least one first transverse support (222) is arranged on the first enclosing purlin (22);
the lengths of the first barrier layer (1) and the second barrier layer (2) are not less than the depth of the deep foundation pit.
2. A deep foundation pit combination support adjacent to an existing building according to claim 1, wherein the first barrier layer (1) further comprises a crown beam (12) connected to the top of each bored pile (11), the bored piles (11) being connected together by the crown beam (12) to increase the barrier strength of the first barrier layer (1).
3. A deep foundation pit assembly support adjacent to an existing building according to claim 2, wherein the first barrier layer (1) is at a vertical distance of 1-1.5m from the edge of the deep foundation pit.
4. A deep foundation pit combination support adjacent to an existing building according to claim 1,
the first enclosing purlin (22) is welded on the inner wall of the second barrier layer (2), and a supporting component is welded below the first enclosing purlin (22) and the first cross brace (222) and used for dispersing bearing force on the first enclosing purlin (22) and the first cross brace (222) to the second barrier layer (2).
5. The deep foundation pit combined support adjacent to the existing building, according to claim 1, wherein the diameter of the cast-in-situ bored pile (11) is 1.25m, the distance between piles is 1.5m, the length of the pile is 16m, C30 concrete is used, and each cast-in-situ bored pile (11) is a friction pile.
6. The deep foundation pit combined support adjacent to the existing building is characterized in that the steel sheet piles (21) are Larsen IV type steel sheet piles (21), the first purlin (22) is made of double H400 section steel, and the first cross brace (222) is made of a phi 630 x 9mm spiral pipe.
7. A deep foundation pit combination support adjacent to an existing building according to any one of claims 1-6, wherein a second supporting structure is further arranged on the inner wall of the second barrier layer (2), the second supporting structure is arranged below the first supporting structure and comprises a second enclosing purlin (23) horizontally arranged along the inner wall of the second barrier layer (2), and at least one second cross brace (231) is arranged on the second enclosing purlin (23);
the first supporting structure and the second supporting structure are uniformly arranged along the depth direction of the deep foundation pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921977153.6U CN211228523U (en) | 2019-11-15 | 2019-11-15 | Deep foundation pit combined support adjacent to existing building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921977153.6U CN211228523U (en) | 2019-11-15 | 2019-11-15 | Deep foundation pit combined support adjacent to existing building |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211228523U true CN211228523U (en) | 2020-08-11 |
Family
ID=71926514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921977153.6U Active CN211228523U (en) | 2019-11-15 | 2019-11-15 | Deep foundation pit combined support adjacent to existing building |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211228523U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777809A (en) * | 2019-11-15 | 2020-02-11 | 浙江交工集团股份有限公司 | Deep foundation pit combined support adjacent to existing building and construction method thereof |
| CN113235613A (en) * | 2021-05-24 | 2021-08-10 | 中国铁路设计集团有限公司 | Newly-built foundation pit excavation supporting method using adjacent existing fender post |
-
2019
- 2019-11-15 CN CN201921977153.6U patent/CN211228523U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777809A (en) * | 2019-11-15 | 2020-02-11 | 浙江交工集团股份有限公司 | Deep foundation pit combined support adjacent to existing building and construction method thereof |
| CN113235613A (en) * | 2021-05-24 | 2021-08-10 | 中国铁路设计集团有限公司 | Newly-built foundation pit excavation supporting method using adjacent existing fender post |
| CN113235613B (en) * | 2021-05-24 | 2024-04-05 | 中国铁路设计集团有限公司 | Method for excavating and supporting newly-built foundation pit by utilizing adjacent existing guard piles |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110777809A (en) | Deep foundation pit combined support adjacent to existing building and construction method thereof | |
| CN103452147B (en) | Self-balancing anchor counterweight broken pile forced-landing tilt correcting method | |
| CN102434717B (en) | Construction method of joist steel pipe-jacking work pit | |
| CN211228523U (en) | Deep foundation pit combined support adjacent to existing building | |
| CN113174988A (en) | Double-wall concrete open caisson structure and construction method | |
| CN101899831B (en) | Active variable-stiffness leveling pile and construction method thereof | |
| CN214883687U (en) | Foundation pit supporting structure | |
| CN114673169A (en) | Multi-layer large-span deep foundation pit cover-excavation forward-backward combined construction method for urban core area | |
| CN114319435A (en) | Underpass underground passage supporting structure with large-section shallow pipe gallery and construction method | |
| CN209923935U (en) | Co-location combined pile wall supporting structure in upper-soft and lower-hard stratum | |
| CN209923952U (en) | Miniature anti-slide pile of soil slope makes up reinforced structure | |
| CN209941754U (en) | High-voltage power pipe culvert in-situ protection structure | |
| CN106988337A (en) | Reinforcing method for reducing uneven settlement of strip-shaped shallow foundation house | |
| CN212656218U (en) | Heavy pile machine load underpinning structure | |
| CN212428824U (en) | Steel structure supporting device of full-recovery assembly type rectangular pipe-jacking working well | |
| CN113404060A (en) | Rigid rib wall type pile wall foundation pit supporting structure and construction method | |
| CN111074936A (en) | Novel retaining wall for inhibiting landslide development and construction method | |
| CN111254914A (en) | Anchoring assembly type underground continuous wall assembly structure and construction method | |
| CN211057851U (en) | Assembled steel-concrete combined square culvert structure based on gyro pile raft plate foundation | |
| CN214061638U (en) | Support-before-dig bored pile and inclined precast pile enclosure | |
| CN211080216U (en) | Inclined tubular pile filling mechanism | |
| CN219547813U (en) | Enclosing purlin shearing-resistant piece suitable for front-support grouting steel pipe foundation pit supporting system | |
| CN220908415U (en) | Prefabricated assembled subway foundation pit supporting structure | |
| JP3246185U (en) | External arch-shaped subsidence prevention device for tunnel excavation | |
| CN216194870U (en) | Pile foundation structure with small masonry amount of combined rod piece |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |