CN112922031A - Protective structure and construction method for underground chamber under existing building - Google Patents
Protective structure and construction method for underground chamber under existing building Download PDFInfo
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- CN112922031A CN112922031A CN202110317261.6A CN202110317261A CN112922031A CN 112922031 A CN112922031 A CN 112922031A CN 202110317261 A CN202110317261 A CN 202110317261A CN 112922031 A CN112922031 A CN 112922031A
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- underground chamber
- underground
- existing building
- cylindrical beam
- protective structure
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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
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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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
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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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- Environmental & Geological Engineering (AREA)
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- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Sustainable Development (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
本发明涉及一种地下硐室下穿既有建筑时的防护结构及施工方法，包括两个支撑构件和至少一根圆柱梁，各根圆柱梁间隔且平行设置，圆柱梁的两端分别和两个支撑构件相连，所述圆柱梁位于上覆既有建筑和拟建地下硐室之间，圆柱梁两端均延伸到地下硐室以及需要保护的上覆既有建筑外侧，两个支撑构件平行于地下硐室掘进方向，分别位于地下硐室两侧斜上方，支撑构件包括依次设置的倾斜延伸段、水平段，圆柱梁端部与支撑构件的水平段相连接，倾斜延伸段外端连接地下硐室，本防护结构设计合理，在地下硐室的上方建立支撑结构，可以有效控制地下硐室上方围岩的变形，显著降低地下硐室开挖建设对上部重要结构的影响。
The invention relates to a protective structure and a construction method when an underground chamber penetrates an existing building, comprising two supporting members and at least one cylindrical beam, each cylindrical beam is arranged at intervals and in parallel, and two ends of the cylindrical beam are respectively connected to the two cylindrical beams. The cylindrical beam is located between the overlying existing building and the proposed underground chamber. Both ends of the cylindrical beam extend to the underground chamber and the outside of the overlying existing building that needs to be protected. The two supporting members are parallel to each other. In the tunneling direction of the underground chamber, they are respectively located at the obliquely above both sides of the underground chamber. The support member includes an inclined extension section and a horizontal section arranged in sequence. The end of the cylindrical beam is connected to the horizontal section of the support member, and the outer end of the inclined extension section is connected to the underground The design of the protection structure is reasonable. The support structure is established above the underground chamber, which can effectively control the deformation of the surrounding rock above the underground chamber, and significantly reduce the impact of the excavation and construction of the underground chamber on the important upper structure.
Description
Technical Field
The invention relates to a protective structure and a construction method for an underground chamber to penetrate through an existing building.
Background
With the continuous and rapid development of the economy of China, the underground engineering construction of China is rapidly increased. In the underground chamber construction process, the stability control of surrounding rocks is an important subject, and particularly when an important structure exists above the underground chamber, the construction of the lower chamber can generate great disturbance on the surrounding rocks, so that the safety of the upper structure is influenced.
The existing surrounding rock deformation control method is generally to construct structures such as anchor rods, linings, advanced pipe sheds and the like in an underground chamber. The anchor rod and the lining can only be constructed after the tunnel is excavated, and the surrounding rock has certain deformation at the moment. The advance pipe shed can advance support surrounding rocks, but the advance pipe shed is arranged around the tunnel, is parallel to the advancing direction of the tunnel, and is gradually suspended along with tunneling, so that the support effect is basically lost.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a protective structure and a construction method for underground chambers to penetrate through existing buildings.
The invention solves the technical problem by adopting the scheme that the protective structure for the underground chamber to penetrate the existing building comprises two supporting members and at least one cylindrical beam, wherein the cylindrical beams are arranged at intervals and in parallel, two ends of each cylindrical beam are respectively connected with the two supporting members, the cylindrical beam is positioned between the overlying existing building and the underground chamber to be built, two ends of each cylindrical beam extend to the underground chamber and the outside of the overlying existing building to be protected, the two supporting members are parallel to the tunneling direction of the underground chamber and are respectively positioned above the two sides of the underground chamber in an inclined mode, each supporting member comprises an inclined extending section and a horizontal section which are sequentially arranged, the end parts of the cylindrical beams are connected with the horizontal sections of the supporting members, and the outer ends of the inclined extending sections are connected with the underground chamber.
Furthermore, the cylindrical beam and the supporting member are both of reinforced concrete structures, and the cylindrical beam and the supporting member are connected through reinforcing steel bars and then cast into a whole through concrete.
Furthermore, an inclinometer pipe is arranged in the cylindrical beam, and a measuring lead extends to the underground chamber.
Furthermore, flat rubber bags are arranged at the top of the cylindrical beam and the bottom of the horizontal section of the supporting member, and guide pipes of the rubber bags extend to the underground chamber.
A construction method of a protective structure when an underground chamber penetrates an existing building comprises the following steps:
(1) in the underground chamber construction process, at a certain distance from an excavation surface to an overlying existing building, respectively excavating pilot tunnels from the underground chamber to two sides of the underground chamber, gradually extending the two pilot tunnels to the obliquely upper part of the underground chamber, and then extending forwards in parallel to the underground chamber until exceeding the overlying existing building for a certain distance;
(2) erecting a drilling machine at the horizontal section of the pilot tunnel, and performing drilling operation to form a drill hole penetrating through the underground chamber;
(3) at the entrance of the drill hole, binding reinforcing steel bars to form a small section of reinforcement cage, then placing the reinforcement cage into the drill hole, and further continuously placing the reinforcement cage along with the gradual formation of the reinforcement cage until the reinforcement cage reaches the pilot tunnel at the other side, wherein the reinforcement cage extends to the outer side of the drill hole for a certain distance;
(4) pouring concrete into the drilled hole, forming a cylindrical beam together with the steel structure, and reserving a section of exposed reinforcement cage at the outer end of the cylindrical beam;
(5) repeating the steps (2) to (4) as required to manufacture a plurality of groups of cylindrical beams;
(6) binding reinforcement cages in the horizontal sections of the two pilot tunnels, and connecting the reinforcement cages with exposed reinforcement cages reserved at the outer ends of the cylindrical beams;
(7) and concrete is injected into the horizontal sections of the pilot tunnels on the two sides to form two supporting members, and meanwhile, the cylindrical beam and the two supporting members are connected into a whole to form a protective structure.
And further, after the construction is finished, backfilling the inclined section of the pilot tunnel by using concrete.
Further, in the step (3), an inclinometer pipe is buried in the cylindrical beam, and a measurement lead is extended to the underground chamber.
Furthermore, in the step (3), a flat rubber bag is buried at the top of the cylindrical beam, a guide pipe of the rubber bag extends to the underground chamber, cement paste is injected into the rubber bag at high pressure when the subsidence deformation of the overlying surrounding rock is large in the construction process of the underground chamber, the cement paste extrudes the overlying surrounding rock to compensate the subsidence of the overlying surrounding rock, powerful support can be provided after the cement paste is hardened, and the overlying existing building can be protected to the maximum extent.
Furthermore, in the step (6), a flat rubber bag is embedded at the bottom of the horizontal section of the pilot tunnel, a guide pipe of the rubber bag extends to the underground chamber, when the whole sinking deformation of the protective structure is large, cement paste is injected into the rubber bag at high pressure, and the protective structure can be prevented from further sinking by the pre-pressure generated by the high-pressure cement paste and the supporting effect provided by the hardened cement paste.
Compared with the prior art, the invention has the following beneficial effects: the supporting structure is built above the underground chamber, so that the deformation of surrounding rock above the underground chamber can be effectively controlled, and the influence of the excavation construction of the underground chamber on an upper important structure is obviously reduced.
Drawings
The invention is further described with reference to the following figures.
FIG. 1 is a schematic view of a protective structure;
FIG. 2 is a schematic view of a cylindrical beam with a rubber bladder;
fig. 3 is a schematic view of the support member provided with a rubber bladder.
In the figure: 1-covering an existing building; 2-building an underground chamber; 3-guiding the hole; 4-cylindrical beam; 5-a support member; 6-rubber bag.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1-3, a protective structure for underground chamber under-penetrating existing building comprises two supporting members 5 and at least one cylindrical beam 4, each cylindrical beam is arranged in parallel and spaced, two ends of the cylindrical beam are respectively connected with the two supporting members, the cylindrical beam is positioned between the overlying existing building 1 and the proposed underground chamber 2, two ends of the cylindrical beam extend to the underground chamber and the outside of the overlying existing building to be protected, two supporting members are parallel to the tunneling direction of the underground chamber and are respectively positioned above the two sides of the underground chamber, each supporting member comprises an inclined extending section and a horizontal section which are sequentially arranged, the end part of the cylindrical beam is connected with the horizontal section of the supporting member, the outer end of the inclined extending section is connected with the underground chamber, after the underground chamber is excavated, the protective structure can transmit the pressure of the overlying surrounding rock to the surrounding rocks on two sides of the underground chamber, and the deformation of rock and soil bodies above the underground chamber is reduced.
Furthermore, the cylindrical beam and the supporting member are both of reinforced concrete structures, and the cylindrical beam and the supporting member are connected through reinforcing steel bars and then cast into a whole through concrete.
Furthermore, an inclinometer pipe is arranged in the cylindrical beam, and a measuring lead extends to the underground chamber, so that the deformation of surrounding rocks above the underground chamber can be monitored in real time.
Furthermore, flat rubber bags are arranged at the top of the cylindrical beam and the bottom of the horizontal section of the supporting member, and guide pipes of the rubber bags extend to the underground chamber.
A construction method of a protective structure when an underground chamber penetrates an existing building comprises the following steps:
(1) in the underground chamber construction process, at a certain distance from an excavation surface to an overlying existing building, respectively excavating pilot tunnels 3 from the underground chamber to two sides of the underground chamber, gradually extending the two pilot tunnels to the obliquely upper part of the underground chamber, and then extending forwards in parallel with the underground chamber until exceeding the overlying existing building for a certain distance;
(2) erecting a drilling machine at the horizontal section of the pilot tunnel, and performing drilling operation to form a drill hole penetrating through the underground chamber;
(3) at the entrance of the drill hole, binding reinforcing steel bars to form a small section of reinforcement cage, then placing the reinforcement cage into the drill hole, and further continuously placing the reinforcement cage along with the gradual formation of the reinforcement cage until the reinforcement cage reaches the pilot tunnel at the other side, wherein the reinforcement cage extends to the outer side of the drill hole for a certain distance;
(4) pouring concrete into the drilled hole, forming a cylindrical beam together with the steel structure, and reserving a section of exposed reinforcement cage at the outer end of the cylindrical beam;
(5) repeating the steps (2) to (4) as required to manufacture a plurality of groups of cylindrical beams;
(6) binding reinforcement cages in the horizontal sections of the two pilot tunnels, and connecting the reinforcement cages with exposed reinforcement cages reserved at the outer ends of the cylindrical beams;
(7) and concrete is injected into the horizontal sections of the pilot tunnels on the two sides to form two supporting members, and meanwhile, the cylindrical beam and the two supporting members are connected into a whole to form a protective structure.
In this embodiment, the inclined section of the pilot tunnel is backfilled with concrete after the construction is completed.
In this embodiment, in step (3), the inclinometer pipe is buried in the cylindrical beam, and the measurement lead is extended to the underground chamber.
In the embodiment, in the step (3), a flat rubber bag is buried at the top of the cylindrical beam, a guide pipe of the rubber bag extends to the underground chamber, cement paste is injected into the rubber bag at high pressure when the subsidence deformation of the overlying surrounding rock is large in the construction process of the underground chamber, the cement paste extrudes the overlying surrounding rock to compensate the subsidence of the overlying surrounding rock, powerful support can be provided after the cement paste is hardened, and the overlying existing building can be protected to the maximum extent.
In this embodiment, in step (6), a flat rubber bag is embedded at the bottom of the horizontal section of the pilot tunnel, a conduit of the rubber bag extends to the underground chamber, when the whole sinking deformation of the protective structure is large, cement slurry is injected into the rubber bag at high pressure, and the protective structure is prevented from further sinking by the pre-pressure generated by the high-pressure cement slurry and the supporting effect provided by the hardened cement slurry.
If this patent discloses or refers to parts or structures that are fixedly connected to each other, the fixedly connected may be understood as: a detachable fixed connection (for example using a bolt or screw connection) can also be understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In the description of this patent, it is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the patent, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
The above-mentioned preferred embodiments, further illustrating the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned are only preferred embodiments of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a protective structure when existing building is worn under underground cave room which characterized in that: including two supporting members and an at least cylinder roof beam, each cylinder roof beam interval and parallel arrangement, the both ends of cylinder roof beam link to each other with two supporting members respectively, the cylinder roof beam is located to be covered existing building and between the underground cave of proposing to build, and the cylinder roof beam both ends all extend to underground cave and need the existing building outside of covering of protecting, and two supporting members are on a parallel with underground cave tunnelling direction, are located underground cave both sides oblique top respectively, and supporting member is including the slope extension section, the horizontal segment that set gradually, and cylinder roof beam tip is connected with supporting member's horizontal segment, and underground cave is connected to slope extension section outer end.
2. The protective structure of underground chamber under existing building as claimed in claim 1, wherein: the cylindrical beam and the supporting member are both of reinforced concrete structures, and are connected through reinforcing steel bars and then cast into a whole through concrete.
3. The protective structure of underground chamber under existing building as claimed in claim 2, wherein: an inclinometer pipe is arranged in the cylindrical beam, and a measuring lead extends to the underground chamber.
4. The protective structure of underground chamber under existing building as claimed in claim 1, wherein: the top of the cylindrical beam and the bottom of the horizontal section of the supporting member are provided with flat rubber bags, and guide pipes of the rubber bags extend to the underground chamber.
5. A construction method for using the underground chamber as claimed in claim 1 to underpass the protective structure of the existing building, comprising the steps of:
(1) in the underground chamber construction process, at a certain distance from an excavation surface to an overlying existing building, respectively excavating pilot tunnels from the underground chamber to two sides of the underground chamber, gradually extending the two pilot tunnels to the obliquely upper part of the underground chamber, and then extending forwards in parallel to the underground chamber until exceeding the overlying existing building for a certain distance;
(2) erecting a drilling machine at the horizontal section of the pilot tunnel, and performing drilling operation to form a drill hole penetrating through the underground chamber;
(3) at the entrance of the drill hole, binding reinforcing steel bars to form a small section of reinforcement cage, then placing the reinforcement cage into the drill hole, and further continuously placing the reinforcement cage along with the gradual formation of the reinforcement cage until the reinforcement cage reaches the pilot tunnel at the other side, wherein the reinforcement cage extends to the outer side of the drill hole for a certain distance;
(4) pouring concrete into the drilled hole, forming a cylindrical beam together with the steel structure, and reserving a section of exposed reinforcement cage at the outer end of the cylindrical beam;
(5) repeating the steps (2) to (4) as required to manufacture a plurality of groups of cylindrical beams;
(6) binding reinforcement cages in the horizontal sections of the two pilot tunnels, and connecting the reinforcement cages with exposed reinforcement cages reserved at the outer ends of the cylindrical beams;
(7) and concrete is injected into the horizontal sections of the pilot tunnels on the two sides to form two supporting members, and meanwhile, the cylindrical beam and the two supporting members are connected into a whole to form a protective structure.
6. The construction method according to claim 5, wherein: and after the construction is finished, backfilling the inclined section of the pilot tunnel by using concrete.
7. The construction method according to claim 5, wherein: and (3) burying an inclinometer pipe in the cylindrical beam, and extending a measuring lead to the underground chamber.
8. The construction method according to claim 5, wherein: in the step (3), a flat rubber bag is buried at the top of the cylindrical beam, a guide pipe of the rubber bag extends to the underground chamber, cement paste is injected into the rubber bag at high pressure when the subsidence deformation of the overlying surrounding rock is large in the construction process of the underground chamber, the cement paste extrudes the overlying surrounding rock to compensate the subsidence of the overlying surrounding rock, powerful support can be provided after the cement paste is hardened, and the overlying existing building can be protected to the maximum extent.
9. The construction method according to claim 5, wherein: and (6) embedding a flat rubber bag at the bottom of the horizontal section of the pilot tunnel, extending a guide pipe of the rubber bag to the underground chamber, injecting cement paste into the rubber bag under high pressure when the whole protective structure sinks to a large deformation amount, and preventing the protective structure from further sinking due to the pre-pressure generated by the high-pressure cement paste and the supporting effect provided by the hardened cement paste.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110317261.6A CN112922031A (en) | 2021-03-25 | 2021-03-25 | Protective structure and construction method for underground chamber under existing building |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110317261.6A CN112922031A (en) | 2021-03-25 | 2021-03-25 | Protective structure and construction method for underground chamber under existing building |
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| CN112922031A true CN112922031A (en) | 2021-06-08 |
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| CN202110317261.6A Pending CN112922031A (en) | 2021-03-25 | 2021-03-25 | Protective structure and construction method for underground chamber under existing building |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115467367A (en) * | 2022-08-17 | 2022-12-13 | 湖北工业大学 | A construction method for actively compensating the deformation of the operating tunnel under the upper construction |
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| CN214940381U (en) * | 2021-03-25 | 2021-11-30 | 福州大学 | Protective structure for underground chamber under existing building |
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2021
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| KR100538272B1 (en) * | 2005-05-10 | 2005-12-21 | 건양씨엔이 (주) | The methods of trenchless underway construction using pre-cast assembly concrete box |
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| CN115467367A (en) * | 2022-08-17 | 2022-12-13 | 湖北工业大学 | A construction method for actively compensating the deformation of the operating tunnel under the upper construction |
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Application publication date: 20210608 |