CN112627233A - Anti-floating system of permanent-temporary combined structure of underground engineering in soft soil area and construction method - Google Patents
Anti-floating system of permanent-temporary combined structure of underground engineering in soft soil area and construction method Download PDFInfo
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- CN112627233A CN112627233A CN202011408665.8A CN202011408665A CN112627233A CN 112627233 A CN112627233 A CN 112627233A CN 202011408665 A CN202011408665 A CN 202011408665A CN 112627233 A CN112627233 A CN 112627233A
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- enclosing
- concrete
- main structure
- purlin
- floating system
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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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention relates to the technical field of tunnel engineering, and discloses an anti-floating system of a permanent temporary combined structure of underground engineering in a soft soil area and a construction method. The structural anti-floating system comprises a cross brace, a concrete enclosing purlin, an enclosing structure and a main body structure, wherein when the main body structure is constructed to be 25 cm-50 cm below the bottom surface of the cross brace, the cross brace is detached, the enclosing purlin is reserved, reinforcing steel bars of the concrete enclosing purlin are implanted into the enclosing structure and the main body structure during construction, the main body structure is connected with the concrete enclosing purlin and the enclosing structure into a whole, and the main body structure, upper covering soil, the enclosing purlin, the dead weight of the enclosing structure and the frictional resistance between the enclosing structure and a soil body are utilized to resist the buoyancy of the structure, so that the structural stability and the durability during tunnel construction and operation are ensured. The anti-floating system of the structure can meet the anti-floating requirement of underground engineering, simultaneously quickens the construction progress, fully utilizes the foundation pit support structure to save the engineering quantity, and has better social and economic benefits.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to an anti-floating system of a permanent temporary combined structure of underground engineering in a soft soil area and a construction method.
Background
With the rapid development of economy and the continuous increase of population in China and the acceleration of urbanization process, more and more cities face the problems that the space between an underground engineering foundation pit enclosure structure and a main structure is narrow and the anti-floating requirement of the structure cannot be met only by self weight. If the design can not meet the anti-floating requirement of the structure, the floating of the structure of a part of the sections, the cracking of the bottom plate and the dislocation of the structure sections can be caused, the damage to the safety and the durability of the engineering structure is great, and the safety of the tunnel operation period is influenced. Therefore, how to reasonably design the anti-floating structure can reduce the construction cost and make the construction convenient and fast on the premise of ensuring the safety of the structure, thereby being particularly practical.
Adopt envelope such as bored pile, underground continuous wall as envelope's open cut tunnel, if major structure and when the earthing dead weight on it can't satisfy anti superficial requirement, generally need set up the uplift pile with bottom plate rigid connection in major structure bottom plate position, reach anti superficial effect through the frictional force between uplift pile and the soil layer, nevertheless uplift pile expense is high, especially the stone section is not only expensive, and the construction period is influenced greatly to the construction degree of difficulty, consequently need for a novel anti superficial structure urgently.
The invention provides an anti-floating system and a construction method of a temporary combined structure of underground engineering in a soft soil area based on a large-span open cut tunnel construction technology and a deep foundation pit design construction technology in a complex urban environment, and can be used in engineering projects requiring anti-floating measures under the condition of narrow space between a main structure and an enclosure structure of an open cut tunnel.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an anti-floating system of a permanent temporary combined structure of an underground engineering in a soft soil area and a construction method. The method aims to solve the problem that anti-floating measures need to be added under the condition that the space between the main structure of the open cut tunnel and the enclosure structure is narrow. According to the treatment method, after the cross brace is detached, the concrete purlin is reserved and poured into the main structure, so that the main structure, the concrete purlin and the enclosure structure are connected into a whole, and the buoyancy of the structure is resisted by the dead weight of the main structure, the upper covering soil, the purlin and the enclosure structure and the frictional resistance between the enclosure structure and a soil body.
In order to solve the technical problems, the invention is realized by the following technical scheme:
on one hand, the invention provides an anti-floating system of an underground engineering permanent temporary combined structure in a soft soil area, which comprises enclosing purlins and building-up supporting enclosing structures which are embedded into a soil body below a designed earth surface and are constructed and supported in the excavation process, a main body structure is clamped between the enclosing structures on two sides, the main body structure of the underground engineering is positioned between the concrete enclosing purlins on the inner side walls of the enclosing structures on two sides, the main body structure, the concrete enclosing purlins and the enclosing structures are fixedly connected to form a combined body, covering soil covers the combined body, and the concrete enclosing purlins and the enclosing structures are used as a temporary foundation pit supporting structure during construction and also used as a part of a structural anti-floating system to form a permanent structure together with the main body structure.
In a preferred embodiment of the present invention, the main structure is located below a design surface, and the ground water level is located above a bottom plate of the main structure.
As a preferred technical scheme of the invention, the reserved steel bars of the enclosure structure are connected with the main bars during construction of the concrete purlin, and the enclosure structure and the concrete purlin are poured to form a whole.
As a preferred technical scheme of the invention, the reserved steel bars or the steel bar connectors of the concrete purlin are connected with the steel bars during the construction of the main body structure, and the concrete purlin and the main body structure are poured to form a whole.
As a preferred technical scheme of the invention, before the concrete purlin is poured into the main body structure, joint waterproof work is required.
On the other hand, the invention also provides a construction method of the permanent-temporary combined structure anti-floating system of the underground engineering in the soft soil area, which comprises the following steps:
s1, constructing the enclosure structure, and excavating a foundation pit after the strength of the enclosure structure meets the design requirement;
s2, digging to the designed elevation of the transverse strut, constructing the concrete purlin and the transverse strut, and continuing to dig downwards until the strength of the concrete purlin reaches the design requirement until the bottom of the pit;
s3, constructing a main structure cushion layer, preventing water, and constructing a reinforced concrete structure bottom plate;
s4, removing the lowest cross brace after the strength of the main structure bottom plate meets the design requirement;
s5, when the cross brace is detached, keeping the concrete purlin within the range of the side wall, and after the waterproof treatment is done, synchronously pouring the concrete purlin and the side wall of the main structure;
s6, sequentially detaching the cross braces within the range of the main structure from bottom to top, and constructing side walls, columns, beams, middle plates and the like of the main structure until a top plate is completed;
and S7, after the main structure top plate is finished, constructing for waterproofing, earthing and backfilling, disassembling the transverse supports and the concrete purlins, and after the pavement is restored as required, finishing the civil engineering part of the underground engineering.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the enclosing structure is effectively utilized to provide anti-buoyancy for the tunnel structure, and investment is saved.
(2) Uplift piles are reduced or even cancelled, the construction difficulty is reduced, the construction progress is increased, and the construction cost is reduced; the tunnel structure integrity is stronger, and the structure is safer.
(3) Enclose the purlin with the concrete that originally is regarded as a part of interim excavation supporting structure, as the component part of the anti system of floating of soft soil area underground works structure, avoid chiseling away the concrete when major structure construction and enclose the purlin, convenient construction reduces the engineering volume, has reduced engineering cost for the time limit for a project.
(4) The invention has simple and clear structure, improves the safety of the tunnel operation period structure, reduces the probability of occurrence of diseases in the operation period, is suitable for the sections of underground engineering which do not meet the anti-floating requirement, is particularly suitable for the construction of soft soil deep foundation pits in the areas with strict requirements on the construction period, and has remarkable social and economic benefits.
Drawings
Fig. 1 is a cross section view of the anti-floating system of the permanent temporary combined structure of the underground engineering in the soft soil area.
In the figure: 1-designing a ground surface, 2-cross braces, 3-concrete purlins, 4-building envelopes and 5-main body structures.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1, the embodiment provides an anti-floating system of a permanent adjacent combined structure of an underground engineering in a soft soil area, which mainly comprises a cross brace 2, a concrete purlin 3, a building envelope 4 and a main structure 5. The main structure 5, the concrete purlin 3 and the enclosure structure 4 are fixedly connected to form a combined body below a designed ground surface 1, wherein the concrete purlin 3 and the enclosure structure 4 are used as a temporary foundation pit supporting structure during construction and are used as a part of a structural anti-floating system to form a permanent structure together with the main structure 5.
Furthermore, when the main body structure is constructed to be 25 cm-50 cm below the bottom surface of the cross support, the cross support is detached, and the surrounding purlin is reserved.
Furthermore, the enclosing structure is provided with steel bars in advance, is connected with the main steel bars when the concrete enclosing purlin is constructed, and is integrally cast with the concrete enclosing purlin.
Furthermore, concrete encloses purlin and reserves reinforcing bar or reinforcing bar connector, with reinforced bar connection when the major structure construction to enclose purlin with the concrete and pour as an organic whole with the major structure.
Furthermore, the concrete purlin should be made waterproof in seams before being poured into the main structure.
Furthermore, the main structure, the concrete purlin and the enclosing structure are connected into a whole, and the self weight of the main structure, the upper covering soil, the purlin and the enclosing structure and the frictional resistance between the enclosing structure and the soil body are utilized to resist the buoyancy of the structure together.
Further, the embodiment also provides a construction method of the permanent-temporary combined structure anti-floating system of the underground engineering in the soft soil area, which comprises the following steps:
s1, constructing the enclosure structure, and excavating a foundation pit after the strength of the enclosure structure meets the design requirement;
s2, digging to the designed elevation of the transverse strut, constructing the concrete purlin and the transverse strut, and continuing to dig downwards until the strength of the concrete purlin reaches the design requirement until the bottom of the pit;
s3, constructing a main structure cushion layer, preventing water, and constructing a reinforced concrete structure bottom plate;
s4, removing the lowest cross brace after the strength of the main structure bottom plate meets the design requirement;
s5, when the cross brace is detached, keeping the concrete purlin within the range of the side wall, and after the waterproof treatment is done, synchronously pouring the concrete purlin and the side wall of the main structure;
s6, sequentially dismantling the wales (one or more) within the range of the main body structure from bottom to top, and constructing the side walls, the columns, the beams, the middle plates and the like of the main body structure until the top plate is finished;
and S7, after the main structure top plate is finished, constructing for waterproofing, earthing and backfilling, disassembling the transverse supports and the surrounding purlins, and after the pavement is restored as required, finishing the civil engineering part of the underground engineering.
According to the description and the drawings of the invention, the anti-floating system of the permanent temporary combined structure of the underground engineering in the soft soil area and the construction method can be easily manufactured or used by the technical personnel in the field, and can generate the positive effects recorded by the invention.
Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The anti-floating system of the underground engineering permanent temporary combined structure in the soft soil area is described in detail, the two cross braces shown in the drawing are only schematic, the number of the cross braces in the actual engineering construction needs to be designed according to the actual situation, and the enclosure structure can adopt the forms of cast-in-situ bored piles, underground continuous walls and the like according to the actual situation. The above description is only for the purpose of helping to understand the method of the present invention and its core idea; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. The utility model provides a soft soil area underground works faces binding structure anti system that floats forever which characterized in that: the construction method comprises an enclosing structure which is embedded into a soil body below the designed earth surface and is constructed to form enclosing purlins and erection supports in the excavation process, a main structure is clamped between the enclosing structures on two sides, the main structure of underground engineering is located between the concrete enclosing purlins on the inner side walls of the enclosing structures on the two sides, the main structure, the concrete enclosing purlins and the enclosing structures are fixedly connected to form a combined body, covering soil covers the combined body, and the concrete enclosing purlins and the enclosing structures serve as foundation pit supporting temporary structures during construction and also serve as a part of a structural anti-floating system and serve as permanent structures together with the main structure.
2. The anti-floating system of the permanent-temporary combined structure of the underground engineering in the soft soil area according to claim 1, wherein: the main structure is positioned below the designed earth surface, and the underground water level is positioned above the bottom plate of the main structure.
3. The anti-floating system of the permanent-temporary combined structure of the underground engineering in the soft soil area according to claim 1, wherein: and the reserved steel bars of the enclosure structure are connected with the main bars during construction of the concrete purlin, and the enclosure structure and the concrete purlin are poured into a whole.
4. The anti-floating system of the permanent-temporary combined structure of the underground engineering in the soft soil area according to claim 1, wherein: and the reserved steel bars or the steel bar connector of the concrete purlin are connected with the steel bars during construction of the main structure, and the concrete purlin and the main structure are poured to form a whole.
5. The anti-floating system of the permanent-temporary combined structure of the underground engineering in the soft soil area according to claim 1, wherein: before the concrete purlin is poured into the main structure, joint waterproof work is required.
6. A construction method of the permanent temporary combined structure anti-floating system of the underground engineering in the soft soil area according to claim 1, which is characterized by comprising the following steps:
s1, constructing the enclosure structure, and excavating a foundation pit after the strength of the enclosure structure meets the design requirement;
s2, digging to the designed elevation of the transverse strut, constructing the concrete purlin and the transverse strut, and continuing to dig downwards until the strength of the concrete purlin reaches the design requirement until the bottom of the pit;
s3, constructing a main structure cushion layer, preventing water, and constructing a reinforced concrete structure bottom plate;
s4, removing the lowest cross brace after the strength of the main structure bottom plate meets the design requirement;
s5, when the cross brace is detached, keeping the concrete purlin within the range of the side wall, and after the waterproof treatment is done, synchronously pouring the concrete purlin and the side wall of the main structure;
s6, sequentially detaching the cross braces within the range of the main structure from bottom to top, and constructing side walls, columns, beams, middle plates and the like of the main structure until a top plate is completed;
and S7, after the main structure top plate is finished, constructing for waterproofing, earthing and backfilling, disassembling the transverse supports and the concrete purlins, and after the pavement is restored as required, finishing the civil engineering part of the underground engineering.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011408665.8A CN112627233A (en) | 2020-12-04 | 2020-12-04 | Anti-floating system of permanent-temporary combined structure of underground engineering in soft soil area and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011408665.8A CN112627233A (en) | 2020-12-04 | 2020-12-04 | Anti-floating system of permanent-temporary combined structure of underground engineering in soft soil area and construction method |
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| CN112627233A true CN112627233A (en) | 2021-04-09 |
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Citations (6)
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2020
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