CN111305856A - Shield construction starting method for subway in narrow section - Google Patents
Shield construction starting method for subway in narrow section Download PDFInfo
- Publication number
- CN111305856A CN111305856A CN202010114170.8A CN202010114170A CN111305856A CN 111305856 A CN111305856 A CN 111305856A CN 202010114170 A CN202010114170 A CN 202010114170A CN 111305856 A CN111305856 A CN 111305856A
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- Prior art keywords
- shield
- construction
- starting
- subway
- well
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
Abstract
The invention belongs to the field of shield construction, and discloses a shield construction starting method for a subway in a narrow section, which comprises the steps of end reinforcement and chiseling, underground excavation construction, shield system hoisting and assembling, shield starting and the like, wherein after the starting well construction is finished, the end is firstly reinforced and chiseled, and then the new Olympic method construction is used, in particular the step method construction of reserved core soil is used; after the construction of the underground excavation section is finished, a rear matched system is installed; then, hoisting and installing a shield body of the shield machine, assembling and debugging the whole shield machine system, and finishing the starting preparation work; and finally starting the shield starting construction according to the shield starting technology. The invention has simple starting process, high safety and better economic benefit.
Description
Technical Field
The invention belongs to the technical field of shield construction, and particularly relates to a method for starting subway shield construction in a narrow section.
Background
At present, the subway tunnel is constructed in a large scale in China by adopting a shield method, but the shield construction has high technical requirements, wherein a shield starting link is the first step of the shield construction and is the most important step. The shield machine has two initial modes: bulk originating techniques and split originating techniques.
Integral launching technique referring to fig. 1, when a shield is launched in a station or a large shaft (shield launching well 2), a shield body of a shield machine 1 is hoisted into an initiating end together with a rear supporting trolley, and the shield body and the rear supporting trolley are connected into a whole to start tunneling. The technology has simple starting process and high safety factor, but requires a larger construction site.
Referring to fig. 2, when a shield is not originated at a station and a vertical shaft in a construction site is small (shield originating shaft 2), a shield body of a shield machine 1 and a part of main rear supporting trolleys are hoisted to an originating end, and the other part of trolleys are installed on the ground, and after the shield tunnel has a length that all the rear supporting trolleys can be put in, the shield machine is further originated according to an integral originating mode. The construction site of the technology has low requirement, and can meet the construction requirement in a narrow space, but the technology needs pipeline and equipment transformation, and has high technical requirement, extra cost increase and high safety factor requirement.
At present, 80% of subway construction in China occurs in cities, the area of a large-area construction land which can be used is very small, the area of a station or a starting well is restricted, meanwhile, shield starting is one of the links with the largest risks in shield construction, and engineering quality and safety accidents are very easy to occur, so that the shield starting is a problem that safety and quality must be focused.
Disclosure of Invention
In order to solve the problem that the space size of a shield starting well is limited, the invention provides a shield starting method for subway construction in a narrow section by combining the advantages and the disadvantages of the existing shield integral starting technology and the split starting technology.
The technical scheme of the invention is as follows:
a method for starting subway shield construction in a narrow section comprises the following steps:
(1) end head reinforcing and chiseling: reinforcing the end head by adopting a jet grouting pile construction technology along the direction opposite to the shield starting direction, wherein the reinforcing areas are the vertical direction and the left-right direction of the outer boundary of the working well, the reinforcing length is 5-6 m, the non-lateral compressive strength of the reinforced soil body is greater than 0.8Mba, and the permeability coefficient is less than 1.0 x 10-7cm/s; after the reinforcement is finished, chiseling the portal part;
(2) construction of a working well: constructing the working well by adopting a core soil step reservation method, firstly annularly excavating an upper step for 4-5m, then excavating a lower step, firstly spraying concrete, then erecting a lower step grid, applying an anchor rod, spraying concrete and sealing, completing a cycle operation, and then performing next cycle construction until the construction of the whole working well is completed;
(3) hoisting a rear matching system: firstly, a storage battery car locomotive goes into a well, then a trolley of the number six hoists the well and moves backwards with the storage battery car, and then trolleys of the number five, the number four, the number three, the number two and the number one are hoisted and go into the well in sequence and move backwards to be connected;
(4) hoisting and assembling a shield body: and completing the well descending of each shield body, and completing the assembly and debugging of the shield system, so that the whole shield system meets the whole starting requirement in a narrow space, and further starting construction is carried out according to the whole starting technology.
In an embodiment of the invention, the reinforcement areas in the step (1) are 3-3.5 m in the up-down direction and 2-2.5 m in the left-right direction of the outer boundary of the working well respectively.
In an embodiment of the invention, the front projection area of the reserved core soil in the step (2) is larger than half of the excavation area of the upper step.
In an embodiment of the present invention, step (2) further includes: in order to prevent the arch springing from sinking, the arch springing is provided with a prevention steel plate and a locking anchor rod.
In an embodiment of the present invention, step (2) further includes: for a local loose area, C25 sprayed concrete is adopted to seal the tunnel face during excavation, and measures of grouting are taken to the tunnel face when necessary, so that the stability of the excavated face is ensured, and vault settlement is prevented.
In an embodiment of the present invention, step (2) further includes: and (3) reserving core soil for manual excavation, wherein arch crown and arch foot are firstly performed, slag is manually turned to a lower step, the excavation footage of the upper part is controlled within 0.5m per cycle, and the contour line is as smooth as possible so as to reduce emergency concentration.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a shield construction starting method for a subway in a narrow section, which is characterized in that a tunneling method is used for construction for a distance in the opposite direction of the starting direction of a shield working well, the installation requirement of a rear matching system in a shield system is met, the whole shield system meets the requirement of integral starting in a narrow space, and starting construction is further carried out according to an integral starting technology.
Drawings
FIG. 1 is a schematic structural diagram of a shield system in the prior art of integrated originating;
FIG. 2 is a schematic structural diagram of a shield system according to the prior art;
FIG. 3 is a schematic structural diagram of a shield system constructed by the shield construction starting method for the subway in the narrow section of the invention;
FIG. 4 is a cross-sectional view taken along the line A-A in FIG. 3;
FIG. 5 is a schematic cross-sectional view of the jet grouting reinforcement area of FIG. 3.
The labels in the figure are: 1-shield machine, 2-shield starting well, 3-soil body and 4-working well.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather construed as limited to the embodiments set forth herein.
It should be noted that all directional indicators (such as up, down, left, right, front, and back) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; the connection can be mechanical connection or welding connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes 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 at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 3 to 5, the method for starting the shield construction of the subway in the narrow section comprises the following steps:
(1) end head reinforcing and chiseling: reinforcing the end head by adopting a jet grouting pile construction technology along the reverse direction of the shield starting direction, wherein the reinforcing area is 3-3.5 m in the vertical direction and 2-2.5 m in the left-right direction of the soil body 3 at the outer boundary of the working well 4, the reinforcing length is 5-6 m, the non-lateral compressive strength of the reinforced soil body 3 is more than 0.8Mba, and the permeability coefficient is less than 1.0 x 10-7cm/s; after the reinforcement is finished, chiseling the portal part;
(2) construction of a working well: constructing the working well 4 by adopting a core soil step reservation method, firstly annularly excavating an upper step for 4-5m, then excavating a lower step, firstly spraying concrete, then erecting a lower step grid, constructing an anchor rod, spraying concrete and sealing to finish a cycle operation, and then performing next cycle construction until the construction of the whole working well 4 is finished;
(3) hoisting a rear matching system: firstly, a storage battery car locomotive goes into a well, then a trolley of the number six hoists the well and moves backwards with the storage battery car, and then trolleys of the number five, the number four, the number three, the number two and the number one are hoisted and go into the well in sequence and move backwards to be connected;
(4) hoisting and assembling a shield body: and completing the well descending of each shield body, and completing the assembly and debugging of the shield system, so that the whole shield system meets the whole starting requirement in a narrow space, and further starting construction is carried out according to the whole starting technology.
And (3) reserving the core soil in the step (2), wherein the frontal projection area of the core soil is larger than half of the excavation area of the upper step.
And (3) in order to prevent the arch springing from sinking in the step (2), arranging a control steel plate and a locking anchor rod on the arch springing.
And (3) for the local loose area in the step (2), C25 sprayed concrete is adopted to seal the tunnel face during excavation, and measures of grouting are taken for the tunnel face as necessary to ensure the stability of the excavated face and prevent vault settlement.
And (3) reserving core soil for manual excavation in the step (2), firstly carrying out arch crown and then arch foot, manually turning over slag to a lower step, controlling the excavation footage of the upper part within 0.5m per cycle, and ensuring that the contour line is as smooth as possible so as to reduce emergency concentration.
The construction distance of the working well 4 can be set to 35m 15m according to the design construction requirement that the design size of a conventional originating well plane is 90m and the whole length of a shield machine system is set to 5-10m, and the construction range is reserved, namely the construction distance in the reverse direction of the underground excavation method is 60-65 m.
Examples
The invention discloses a shield construction starting method for a subway in a narrow section. The implementation process is as follows: after the construction of the starting well is finished, firstly reinforcing and chiseling the end head, and then constructing by using a new Olympic method, wherein the construction length is 55m, and specifically, the construction is carried out by a reserved core soil step method; after the construction of the underground excavation section is finished, a rear matched system is installed; then, hoisting and installing a shield body of the shield machine, assembling and debugging the whole shield machine system, and finishing the starting preparation work; and finally starting the shield starting construction according to the shield starting technology.
The invention is described in further detail below with reference to the following figures and fabrication processes.
(1) And reinforcing and chiseling the end head.
End reinforcement is carried out along the direction opposite to the starting direction of the shield, the soil body reinforcement adopts jet grouting pile construction, the reinforcement range is 3m above and below the soil body 3 at the outer boundary and 2m at the left and right, and the reinforcement length is 5 m; the reinforced soil body has no lateral compressive strength of not less than 0.8Mba and permeability coefficient of less than 1.0 x 10-7cm/s. The soil body has good uniformity, self-supporting property and water stopping property. The range of the reinforced area is shown in figures 4-5.
And after the reinforcement is finished, beginning construction and removing the portal part to prepare for the subsequent new Austrian construction.
(2) And (5) constructing by a new Austrian method.
The construction length is 60-65m, and the construction is carried out by adopting a method of reserving a core soil step. And excavating an upper step soil body in an annular mode, reserving core soil, and enabling the front projection area of the core soil to be not less than half of the excavation area of the upper step. And performing primary support construction operation. And then excavating the lower step when the upper step is excavated for 4-5m, erecting a lower step grid after the concrete is sprayed for the first time, constructing an anchor rod, spraying the concrete and sealing to finish a cycle operation, and then performing the next cycle construction to finally finish the construction of the whole underground excavation section.
(3) And hoisting the rear matching system.
The method comprises the steps of firstly, enabling the electric locomotive to go into a well, then hoisting and going into the well by the six trolleys and moving the electric locomotive backwards, and then sequentially hoisting and going into the well by the five trolleys, the four trolleys, the three trolleys, the two trolleys and the one trolley and moving the trolleys backwards to be connected.
(4) And (5) hoisting the shield body.
Firstly, a shield in a shield machine 1 is put into a well, then a front shield of the shield machine is put into the well, the front shield is moved backwards by using a jack to connect the front shield and a rear shield, then a cutter head is put into the well and connected, finally the front section of a screw machine is put into the well and connected, and the hoisting, the placing and the installation of a shield body are completed.
(5) Assembling and adjusting the shield system.
The front part of the assembly platform is arranged in a well and connected with the assembly platform, the rear part of the screw machine is arranged in the well and connected with the assembly platform, the assembly platform is arranged in the well and connected with the assembly platform, the trolley is integrally moved and connected with the shield body, all pipeline connections, belt connections and the like are connected, and the power-on adjustable shield machine assembly is carried out.
(6) After the mode is successfully adjusted, the shield launching is carried out according to the integral launching technology.
Through adopting above-mentioned technical scheme, make it compare with prior art and have following beneficial effect:
the technology combines the advantages and disadvantages of the integral launching technology and the split launching technology, the length of the launching space is increased by using the new Austrian construction for a certain distance, the launching mode can adopt the integral launching technology, the launching process of the technology is simple, and the safety is high; the technical requirements and cost increase of pipeline and equipment modification brought by a split starting technology are avoided; has better economic benefit.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. A method for starting subway shield construction in a narrow section is characterized by comprising the following steps:
(1) end head reinforcing and chiseling: reinforcing the end head by adopting a jet grouting pile construction technology along the direction opposite to the shield starting direction, wherein the reinforcing areas are the vertical direction and the left-right direction of the outer boundary of the working well, the reinforcing length is 5-6 m, the non-lateral compressive strength of the reinforced soil body is greater than 0.8Mba, and the permeability coefficient is less than 1.0 x 10-7cm/s; after the reinforcement is finished, chiseling the portal part;
(2) construction of a working well: constructing the working well by adopting a core soil step reservation method, firstly annularly excavating an upper step for 4-5m, then excavating a lower step, firstly spraying concrete, then erecting a lower step grid, applying an anchor rod, spraying concrete and sealing, completing a cycle operation, and then performing next cycle construction until the construction of the whole working well is completed;
(3) hoisting a rear matching system: firstly, a storage battery car locomotive goes into a well, then a trolley of the number six hoists the well and moves backwards with the storage battery car, and then trolleys of the number five, the number four, the number three, the number two and the number one are hoisted and go into the well in sequence and move backwards to be connected;
(4) hoisting and assembling a shield body: and completing the well descending of each shield body, and completing the assembly and debugging of the shield system, so that the whole shield system meets the whole starting requirement in a narrow space, and further starting construction is carried out according to the whole starting technology.
2. The starting method for the shield construction of the subway in the narrow section according to claim 1, wherein the reinforcement area in step (1) is 3-3.5 m in the up-down direction and 2-2.5 m in the left-right direction of the outer boundary of the working well.
3. The starting method for the shield construction of the subway in the narrow section according to claim 1, wherein the front projection area of the reserved core soil in the step (2) is more than half of the excavation area of the upper step.
4. The starting method for the shield construction of the subway in the narrow section according to claim 1, wherein the step (2) further comprises: in order to prevent the arch springing from sinking, the arch springing is provided with a prevention steel plate and a locking anchor rod.
5. The starting method for the shield construction of the subway in the narrow section according to claim 1, wherein the step (2) further comprises: for a local loose area, C25 sprayed concrete is adopted to seal the tunnel face during excavation, and measures of grouting are taken to the tunnel face when necessary, so that the stability of the excavated face is ensured, and vault settlement is prevented.
6. The starting method for the shield construction of the subway in the narrow section according to claim 1, wherein the step (2) further comprises: and (3) reserving core soil for manual excavation, wherein arch crown and arch foot are firstly performed, slag is manually turned to a lower step, the excavation footage of the upper part is controlled within 0.5m per cycle, and the contour line is as smooth as possible so as to reduce emergency concentration.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010114170.8A CN111305856B (en) | 2020-02-24 | 2020-02-24 | Shield construction starting method for subway in narrow section |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010114170.8A CN111305856B (en) | 2020-02-24 | 2020-02-24 | Shield construction starting method for subway in narrow section |
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| CN111305856A true CN111305856A (en) | 2020-06-19 |
| CN111305856B CN111305856B (en) | 2021-11-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113389558A (en) * | 2021-07-02 | 2021-09-14 | 中铁十一局集团有限公司 | TBM (Tunnel boring machine) starting platform for narrow space and construction method thereof |
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