CN112962671A - Urban operation subway heave control structure and control method thereof - Google Patents
Urban operation subway heave control structure and control method thereof Download PDFInfo
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- CN112962671A CN112962671A CN202110198056.2A CN202110198056A CN112962671A CN 112962671 A CN112962671 A CN 112962671A CN 202110198056 A CN202110198056 A CN 202110198056A CN 112962671 A CN112962671 A CN 112962671A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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Abstract
The invention discloses a control structure and a control method for urban operation subway heave, which comprises the following steps: the uplift piles are respectively embedded in foundation pits to be excavated on two opposite sides of an underground structure for operating a subway, and the embedding depth of pile tops of the uplift piles is positioned between the embedding depth of the top and the embedding depth of the bottom of the underground structure; the bottom rope tube is supported at the bottom of the underground structure, and two ends of the bottom rope tube are respectively connected to the upper parts of the uplift piles at two opposite sides of the underground structure; and the back-pressure prestressed tendons are pressed against the upper part of the underground structure, and two ends of the back-pressure prestressed tendons are respectively connected to the upper parts of the uplift piles on two opposite sides of the underground structure. The invention solves the problem that the development of new building products on two sides of an operated subway station easily causes the uplift or settlement of an operated subway structure and seriously affects the safety of the operated subway structure.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a control structure and a control method for urban operation subway heave.
Background
Under the background that urban land resources are in shortage day by day and rail transit promotes urban development, the charm of the lifting junction node is the key for improving the land value along the line, and the station space is not simply used as a moving space for connecting a station body and a city, but plays a role in embodying urban characteristics. Therefore, a station-city integrated complex high-end business circle taking a public transport hub and a station as a core is gradually derived.
The new building products are developed on two sides of an operated subway station, and the unloading of the foundation pit of the new building products is excavated on two sides of the operated subway, so that the structure of the operated subway is bound to be raised, and the structure of the operated subway is bound to be settled by the peripheral rainfall of the operated subway. Therefore, the development of new building products on both sides of the operated subway station easily causes the uplift or settlement of the operated subway structure, and the safety of the operated subway structure is seriously affected.
Disclosure of Invention
In order to overcome the defects in the prior art, a control structure and a control method for urban operation subway heave are provided so as to solve the problem that the development of new building products on two sides of an operated subway station is easy to cause heave or settlement of the operated subway structure and seriously affect the safety of the operated subway structure.
In order to realize above-mentioned purpose, provide an urban operation subway and heavily sink control structure, include:
the uplift piles are respectively embedded in foundation pits to be excavated on two opposite sides of an underground structure for operating a subway, and the embedding depth of pile tops of the uplift piles is positioned between the embedding depth of the top and the embedding depth of the bottom of the underground structure;
the bottom rope tube is supported at the bottom of the underground structure, and two ends of the bottom rope tube are respectively connected to the upper parts of the uplift piles at two opposite sides of the underground structure; and
and the back-pressure prestressed tendons are pressed against the upper part of the underground structure, and two ends of the back-pressure prestressed tendons are respectively connected to the upper parts of the uplift piles on two opposite sides of the underground structure.
Furthermore, many uplift piles are respectively arranged along the length direction of the tunnel of the operation subway, and the bottom rope tube is supported at the bottom of the tunnel.
Further, the quantity of rope pipe is many at the bottom of the pocket, many uplift pile one-to-one sets up the relative both sides of underground structure, every the both ends of rope pipe at the bottom of the pocket connect respectively in one uplift pile's upper portion.
Furthermore, the number of the back-pressure prestressed tendons is multiple, and two ends of each back-pressure prestressed tendon are respectively connected to the upper part of one uplift pile.
Further, the bottom rope tube includes:
the prestressed tendon penetrating pipeline is embedded in soil below the tunnel and supported at the bottom of the tunnel; and
the bearing prestress rib penetrates through the prestress rib bundle penetrating pipeline, and two ends of the bearing prestress are respectively connected to the upper portions of the uplift piles on two opposite sides of the underground structure.
Furthermore, the bearing prestressed tendons and the back pressure prestressed tendons are unbonded prestressed tendons.
The invention provides a method for controlling the heave of an urban operation subway, which comprises the following steps:
before excavation of foundation pits to be excavated on two opposite sides of an underground structure of an operation subway, a plurality of uplift piles are respectively embedded in the foundation pits to be excavated on the two opposite sides of the underground structure, and the buried depth of pile tops of the uplift piles is located between the buried depth of the top and the buried depth of the bottom of the underground structure;
penetrating the bottom rope tube through the underground structure and embedding the bottom rope tube at the bottom of the underground structure, and respectively connecting two ends of the bottom rope tube to the upper parts of the uplift piles at two opposite sides of the underground structure;
carrying out precipitation treatment on the foundation pit to be excavated, and after the underground structure is settled, supporting the bottom rope pipe at the bottom of the underground structure to avoid the settlement deformation of the underground structure;
and the back-pressure prestressed tendons stretch over the upper part of the underground structure, and the two ends of the back-pressure prestressed tendons are respectively connected to the upper parts of the uplift piles on the two opposite sides of the underground structure.
After the treatment of dewatering of the foundation pit to be excavated, excavating the opposite two sides of the underground structure to be excavated, and after the excavation of the foundation pit to be excavated, pressing the back-pressure prestressed tendons against the upper part of the underground structure to avoid the uplifting and deformation of the underground structure.
The urban operation subway settlement control structure has the advantages that when the underground structure is subjected to precipitation treatment before excavation of foundation pits to be excavated on the two opposite sides of the underground structure, the underground structure supported on the operation subway through the pocket bottom cable pipe supports is prevented from settling and deforming, when the underground structure is caused to be settled due to unloading of an excavation soil body of the foundation pits to be excavated, the underground structure is tensioned through the back-pressure prestressed tendons and then is subjected to back pressure, the underground structure is prevented from being lifted and deformed, further, the deformation of the underground structure can be effectively and pertinently controlled, and the safety of the operation subway is improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a metro heave control structure for urban operation according to an embodiment of the present invention.
Fig. 2 is a schematic view of an installation state of a back-pressure prestressed tendon of a metro heave control structure in urban operation according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a schematic structural diagram of an urban operation subway heave control structure according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of an installation state of a back pressure prestressed tendon of the urban operation subway heave control structure according to an embodiment of the present invention.
Referring to fig. 1 and 2, the present invention provides a metro heave control structure for urban operation, including: a plurality of uplift piles 1, a bottom rope tube 2 and a back pressure prestressed tendon 3.
A plurality of uplift piles 1 are respectively buried in foundation pits 5 to be excavated on two opposite sides of an underground structure 4 for operating a subway. The burial depth of the pile top of the uplift pile 1 is located between the top burial depth and the bottom burial depth of the underground structure 4.
The bottom rope tube 2 is supported at the bottom of the underground structure 4. Both ends of the rope tube 2 are connected to the upper portions of the uplift piles 1 at opposite sides of the underground structure 4, respectively.
The back pressure prestressed tendons 3 are pressed against the upper part of the underground structure 4. The two ends of the back pressure prestressed tendons 3 are respectively connected with the upper parts of the uplift piles 1 on the two opposite sides of the underground structure 4.
According to the urban operation subway settlement control structure, when precipitation treatment is carried out before excavation of foundation pits to be excavated on the two opposite sides of the underground structure, the underground structure supported on the operation subway through the pocket bottom cable pipe supports is prevented from settling and deforming, when the underground structure is lifted due to unloading of an excavation soil body of the foundation pits to be excavated, the underground structure is prevented from rising and deforming by reversely pressing the prestressed ribs and then reversely pressing the underground structure after tensioning, so that the deformation of the underground structure can be effectively and pertinently controlled, and the safety of the operation subway is improved.
In this embodiment, the uplift piles 1 are arranged along the longitudinal direction of the tunnel 41 in which the subway is operated, and the bottom rope pipe 2 is supported by the bottom of the tunnel 41.
The quantity of rope pipe 2 is many, and many uplift piles 1 set up the relative both sides of underground structure 4 one-to-one, and the both ends of every rope pipe 2 are connected respectively in the upper portion of an uplift pile 1.
The number of the back-pressure prestressed tendons 3 is multiple, and two ends of each back-pressure prestressed tendon 3 are respectively connected to the upper part of one uplift pile 1.
As a preferred embodiment, the bottom rope tube 2 includes: the prestressed tendons penetrate the pipeline and support the prestressed tendons.
The prestressed tendon penetrating pipeline is buried in soil below the tunnel 41 and supported at the bottom of the tunnel 41.
The bearing prestressed tendons penetrate through the prestressed tendon penetration pipeline. The two ends bearing the prestress are respectively connected to the upper parts of the uplift piles 1 at the two opposite sides of the underground structure 4.
The bearing prestressed tendons and the back pressure prestressed tendons 3 are unbonded prestressed tendons.
The invention provides an urban operation subway heave control method of an urban operation subway heave control structure, which comprises the following steps:
s1: before excavation of foundation pits 5 to be excavated on the two opposite sides of an underground structure 4 of an operation subway, a plurality of uplift piles 1 are buried in the foundation pits 5 to be excavated on the two opposite sides of the underground structure 4 respectively, and the buried depth of the pile top of the uplift pile 1 is located between the buried depth of the top and the buried depth of the bottom of the underground structure 4.
Before the construction of the foundation pit to be excavated, a three-dimensional finite element model is adopted for simulation inversion, and the heave deformation value of the underground structure of the operation subway caused by the excavation of the foundation pit to be excavated is deduced. And setting the uplift pile according to the deformation range deduced by simulation, and completing the uplift pile construction in the engineering pile construction process.
S2: and (2) penetrating the bottom rope tube 2 through the underground structure 4 and embedding the bottom rope tube in the bottom of the underground structure 4, and respectively connecting two ends of the bottom rope tube 2 to the upper parts of the uplift piles 1 on two opposite sides of the underground structure 4.
S3: right treat to excavate foundation ditch 5 and carry out precipitation treatment underground structure 4 subsides the back, the bearing of rope pipe 2 at the bottom of pocket in underground structure 4 is in order to avoid underground structure 4 subsides the deformation.
The underground structure takes place to subside because of carrying out the precipitation before the earthwork excavation of waiting to excavate the foundation ditch, then in time goes on to ask through the underground structure to the operation subway, adopts the operating mode as shown in figure 1, adopts horizontal directional boring in the foundation ditch of one side of the underground structure of operation subway, according to the design line drilling of rope pipe at the bottom of the pocket, returns to drag prestressing tendons after the drilling is accomplished and wears to restraint the pipeline. After the prestressed tendon penetrating pipeline is buried and finished, a bearing prestressed tendon penetrates into the prestressed tendon penetrating pipeline, two ends of the bearing prestressed tendon are connected with the uplift pile 1, and drilling is carried out on the uplift pile and an anchoring rib is arranged. And after the bearing prestressed tendons are connected with the uplift piles, tensioning is carried out according to the simulated and deduced prestressed value so as to achieve the purpose of supporting the underground structure of the operation subway. And after the upper support is finished, grouting is carried out in the prestressed tendon penetrating pipeline, and the subway sinking deformation control is finished.
S4: and the back-pressure prestressed tendons 3 are arranged on the upper part of the underground structure 4 in a crossing manner, and two ends of the back-pressure prestressed tendons 3 are respectively connected to the upper parts of the uplift piles 1 on two opposite sides of the underground structure 4.
S5: treat excavation foundation ditch 5 precipitation treatment back, excavate the relative both sides of underground structure 4 treat excavation foundation ditch 5 excavation back, backpressure prestressing tendons 3 press in the upper portion of underground structure 4 is in order to avoid underground structure 4 rises to warp.
In the process of excavating the earthwork of the foundation pit to be excavated, the underground structure of an operation subway is uplifted due to unloading of the earthwork of the foundation pit to be excavated on two sides, a working condition shown in figure 2 is adopted, a back-pressure prestressed tendon is laid on the upper part of the underground structure of the operation subway, the end part of the back-pressure prestressed tendon is connected with the top of an uplift pile, and the uplift pile is drilled and provided with an anchoring rib. And after the two ends of the back-pressure prestressed tendon are respectively connected with the uplift piles on the two opposite sides of the underground structure, tensioning is carried out according to the simulated and deduced prestressed value, so that the underground structure of the subway in operation is pressed down by the back-pressure prestressed tendon.
The uplift pile control structure for the urban operation subway is used for pressing down and supporting the underground structure of the operation subway by combining the uplift pile with the unbonded prestressed tendons (supporting prestressed tendons and back-pressure prestressed tendons), so that the purpose of controlling the uplift and sinking deformation of the underground structure of the operation subway is achieved, the uplift pile can be arranged in combination with the engineering pile, and the purpose of controlling the deformation is achieved while the cost is saved.
The construction method of the urban operation subway heave control structure is simple and easy to implement, changes the traditional floating control mode, and increases the uplift method for the underground structure of the operation subway to cope with the heave.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (7)
1. The utility model provides an urban operation subway control structure that heavily sinks which characterized in that includes:
the uplift piles are respectively embedded in foundation pits to be excavated on two opposite sides of an underground structure for operating a subway, and the embedding depth of pile tops of the uplift piles is positioned between the embedding depth of the top and the embedding depth of the bottom of the underground structure;
the bottom rope tube is supported at the bottom of the underground structure, and two ends of the bottom rope tube are respectively connected to the upper parts of the uplift piles at two opposite sides of the underground structure; and
and the back-pressure prestressed tendons are pressed against the upper part of the underground structure, and two ends of the back-pressure prestressed tendons are respectively connected to the upper parts of the uplift piles on two opposite sides of the underground structure.
2. The urban operation subway heave control structure according to claim 1, wherein a plurality of the uplift piles are respectively arranged along a length direction of a tunnel of the operation subway, and the bottom rope pipe is supported at the bottom of the tunnel.
3. The urban operation subway heave control structure according to claim 2, wherein the number of the rope tubes is plural, the plural uplift piles are arranged on opposite sides of the underground structure in a one-to-one correspondence manner, and both ends of each rope tube are respectively connected to the upper part of one uplift pile.
4. The urban operation subway heave control structure according to claim 2, wherein the number of the back-pressure prestressed tendons is multiple, and both ends of each back-pressure prestressed tendon are respectively connected to the upper part of one uplift pile.
5. The urban operation subway heave control structure according to claim 2, wherein the rope tube comprises:
the prestressed tendon penetrating pipeline is embedded in soil below the tunnel and supported at the bottom of the tunnel; and
the bearing prestress rib penetrates through the prestress rib bundle penetrating pipeline, and two ends of the bearing prestress are respectively connected to the upper portions of the uplift piles on two opposite sides of the underground structure.
6. A control structure for the heave of an urban operation subway according to claim 5, wherein said supporting tendons and said counter-pressure tendons are unbonded tendons.
7. An urban operation subway heave control method of the urban operation subway heave control structure according to any one of claims 1-6, characterized by comprising the following steps:
before excavation of foundation pits to be excavated on two opposite sides of an underground structure of an operation subway, a plurality of uplift piles are respectively embedded in the foundation pits to be excavated on the two opposite sides of the underground structure, and the buried depth of pile tops of the uplift piles is located between the buried depth of the top and the buried depth of the bottom of the underground structure;
penetrating the bottom rope tube through the underground structure and embedding the bottom rope tube at the bottom of the underground structure, and respectively connecting two ends of the bottom rope tube to the upper parts of the uplift piles at two opposite sides of the underground structure;
carrying out precipitation treatment on the foundation pit to be excavated, and after the underground structure is settled, supporting the bottom rope pipe at the bottom of the underground structure to avoid the settlement deformation of the underground structure;
and the back-pressure prestressed tendons stretch over the upper part of the underground structure, and the two ends of the back-pressure prestressed tendons are respectively connected to the upper parts of the uplift piles on the two opposite sides of the underground structure.
After the treatment of dewatering of the foundation pit to be excavated, excavating the opposite two sides of the underground structure to be excavated, and after the excavation of the foundation pit to be excavated, pressing the back-pressure prestressed tendons against the upper part of the underground structure to avoid the uplifting and deformation of the underground structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110198056.2A CN112962671A (en) | 2021-02-22 | 2021-02-22 | Urban operation subway heave control structure and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110198056.2A CN112962671A (en) | 2021-02-22 | 2021-02-22 | Urban operation subway heave control structure and control method thereof |
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| CN112962671A true CN112962671A (en) | 2021-06-15 |
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| JP2006112148A (en) * | 2004-10-15 | 2006-04-27 | Ohbayashi Corp | Underground structure, upfloat preventive method and construction method of underground structure |
| CN200985518Y (en) * | 2006-12-20 | 2007-12-05 | 上海市第一建筑有限公司 | Portal type anti floating structure |
| CN102767194A (en) * | 2012-07-13 | 2012-11-07 | 河海大学 | Construction method for treating operating metro tunnel settlement by using anchor cable method |
| CN105926637A (en) * | 2016-06-28 | 2016-09-07 | 吴龙梁 | Prestressing force support system for protecting existing subway and design and construction method |
| CN110307004A (en) * | 2019-06-20 | 2019-10-08 | 浙江大学城市学院 | Grand heavy ruggedized construction and construction method are prevented in a kind of tunnel using steel strand tension |
| CN111396060A (en) * | 2020-01-08 | 2020-07-10 | 北京工业大学 | Anti-bulging reinforcing method for newly-built tunnel to penetrate existing shield tunnel in ultra-short distance |
-
2021
- 2021-02-22 CN CN202110198056.2A patent/CN112962671A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006112148A (en) * | 2004-10-15 | 2006-04-27 | Ohbayashi Corp | Underground structure, upfloat preventive method and construction method of underground structure |
| CN200985518Y (en) * | 2006-12-20 | 2007-12-05 | 上海市第一建筑有限公司 | Portal type anti floating structure |
| CN102767194A (en) * | 2012-07-13 | 2012-11-07 | 河海大学 | Construction method for treating operating metro tunnel settlement by using anchor cable method |
| CN105926637A (en) * | 2016-06-28 | 2016-09-07 | 吴龙梁 | Prestressing force support system for protecting existing subway and design and construction method |
| CN110307004A (en) * | 2019-06-20 | 2019-10-08 | 浙江大学城市学院 | Grand heavy ruggedized construction and construction method are prevented in a kind of tunnel using steel strand tension |
| CN111396060A (en) * | 2020-01-08 | 2020-07-10 | 北京工业大学 | Anti-bulging reinforcing method for newly-built tunnel to penetrate existing shield tunnel in ultra-short distance |
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