阅读说明：本技术 暗挖车站主体导洞内向车站附属暗挖段施工超前支护方法 (Advanced support method for construction of auxiliary underground excavation section of underground excavation station from inside of main body pilot tunnel of underground excavation station to statio) 是由 柳晔 张哲强 刘亮 张美琴 彭柳松 张金伟 李晓英 彭晨 吕杰 王齐 秦威风 于 2021-07-23 设计创作，主要内容包括：本发明提供了一种暗挖车站主体导洞内向车站附属暗挖段施工超前支护方法,包括如下步骤：S1：施工车站主体标准段导洞；S2：沿车站主体标准段导洞施工车站主体过渡段导洞；S3：沿车站主体过渡段导洞施工车站主体扩挖段导洞,所述车站主体扩挖段导洞位于车站附属暗挖段上方；S4：施工车站附属暗挖段超前支护。本发明在暗挖车站施工过程中,利用车站和附属接口上方导洞,通过扩挖该导洞以提供附属暗挖段超前支护施工空间,从而提供附属施工期间,车站主体内向附属结构暗挖施工作业面,从而优化车站附属施工工期,节约工程造价,并降低施工风险,为节约附属工期提供了一种较理想的解决方法。(The invention provides a construction advance support method for an underground excavation station main body pilot tunnel to an auxiliary underground excavation section of a station, which comprises the following steps: s1: constructing a standard section pilot tunnel of a station main body; s2: constructing a station main body transition section pilot tunnel along the station main body standard section pilot tunnel; s3: constructing a station main body expanded excavation section pilot tunnel along a station main body transition section pilot tunnel, wherein the station main body expanded excavation section pilot tunnel is positioned above a station auxiliary underground excavation section; s4: and (5) constructing advanced supports of the auxiliary underground excavation sections of the stations. In the construction process of the underground excavation station, the pilot tunnel above the station and the auxiliary interface is utilized, and the pilot tunnel is expanded and excavated to provide the advanced supporting construction space of the auxiliary underground excavation section, so that the underground excavation construction working surface facing the auxiliary structure in the main body of the station during the auxiliary construction period is provided, the auxiliary construction period of the station is optimized, the construction cost is saved, the construction risk is reduced, and a more ideal solution is provided for saving the auxiliary construction period.)

1. The advanced support method for the construction of the auxiliary underground excavation section of the underground excavation station in the main body pilot tunnel of the underground excavation station is characterized in that: the method comprises the following steps:

s1: constructing a standard section pilot tunnel of a station main body;

s2: constructing a station main body transition section pilot tunnel along the station main body standard section pilot tunnel;

s3: constructing a station main body expanded excavation section pilot tunnel along a station main body transition section pilot tunnel, wherein the station main body expanded excavation section pilot tunnel is positioned above a station auxiliary underground excavation section;

s4: and (5) constructing advanced supports of the auxiliary underground excavation sections of the stations.

2. The underground excavation station main body pilot tunnel construction advanced support method to the station subsidiary underground excavation section as claimed in claim 1, characterized in that: the in-tunnel space of the station main body expanding excavation section pilot tunnel needs to meet the requirement of advanced support construction of the station auxiliary underground excavation section.

3. The advanced support method for the construction of the underground excavation section attached to the station in the main body pilot tunnel of the underground excavation station as claimed in claim 1 or 2, characterized in that: the expanding excavation direction of the station main body expanding excavation section pilot tunnel comprises a left side, a right side and a bottom.

4. The underground excavation station main body pilot tunnel construction advanced support method to the station subsidiary underground excavation section as claimed in claim 1, characterized in that: and before the construction of the steps S1, S2 and S3, the pilot tunnel arch part is arranged for advance support.

5. The underground excavation station main body pilot tunnel construction advanced support method to the station subsidiary underground excavation section as claimed in claim 1, characterized in that: in the step S4, when the pile top crown beam of the main body fender post of the station collides with the advanced support of the auxiliary underground excavation section of the station, the advanced support of the auxiliary underground excavation section of the station is constructed first, and then the pile top crown beam of the main body fender post of the station is constructed.

Technical Field

The invention belongs to the field of underground engineering construction, and particularly relates to a construction advance support method for an auxiliary underground excavation section of an underground excavation station from a main body pilot tunnel of the underground excavation station.

Background

Along with the rapid development of society, underground space development is emphasized, but most development positions are located below roads, and because of the restriction of factors such as traffic guidance and improvement, an underground excavation method is required for construction. However, the construction of the underground excavation method has the problems of large risk, long construction period, high manufacturing cost and the like, and the traditional underground excavation method adopts the main body firstly and then the auxiliary processes, so that the total construction period is long.

Disclosure of Invention

The invention provides a method for constructing an advance support to an auxiliary underground excavation section of a station in a main body pilot tunnel of the underground excavation station, aiming at the technical problems in the prior art, in the construction process of the underground excavation station, the pilot tunnel above the station and the auxiliary interface is utilized, and the pilot tunnel is expanded and excavated to provide a construction space for the advance support (a pipe shed, an advance conduit, an advance anchor rod and the like) of the auxiliary underground excavation section, so that an auxiliary construction working surface is provided for the underground excavation construction of an auxiliary structure in the main body of the station during the auxiliary construction period, thereby optimizing the auxiliary construction period of the station, saving the construction cost, reducing the construction risk and providing a more ideal solution for saving the auxiliary construction period.

The technical scheme adopted by the invention is as follows: a method for constructing an advance support to an auxiliary underground excavation section of a station in an underground excavation station main body pilot tunnel comprises the following steps:

s1: constructing a standard section pilot tunnel of a station main body;

s2: constructing a station main body transition section pilot tunnel along the station main body standard section pilot tunnel;

s3: constructing a station main body expanded excavation section pilot tunnel along a station main body transition section pilot tunnel, wherein the station main body expanded excavation section pilot tunnel is positioned above a station auxiliary underground excavation section;

s4: and (5) constructing advanced supports of the auxiliary underground excavation sections of the stations.

Furthermore, the space in the tunnel of the station main body expanding excavation section pilot tunnel needs to meet the requirement of advanced support construction of the auxiliary underground excavation section of the station. The advanced support of the auxiliary underground excavation section of the station generally adopts the modes of pipe sheds, advanced guide pipes, advanced anchor rods and the like, and the space in the tunnel of the guide hole of the main expanded excavation section of the station is determined according to the construction space required by the specific mode of the advanced support of the auxiliary underground excavation section of the station.

Further, the expanding excavation direction of the station main body expanding excavation section pilot tunnel comprises a left side, a right side and a bottom.

Furthermore, before the construction in the steps S1, S2 and S3, a pilot support of the pilot tunnel arch is arranged.

Furthermore, in some projects, a crown beam of a pile top of the station main body fender pile needs to be constructed in the expanded excavation section guide hole of the station main body. In the step S4, when the pile top crown beam of the main body fender post of the station collides with the advanced support of the auxiliary underground excavation section of the station, the advanced support of the auxiliary underground excavation section of the station is constructed first, and then the pile top crown beam of the main body fender post of the station is constructed.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the main body and the auxiliary interface are used as the auxiliary advance support construction space in the underground excavation underground engineering, so that the underground excavation construction working surface of the main body towards the auxiliary structure in the auxiliary construction period is provided, and the purposes of optimizing the auxiliary construction period, saving the construction cost and reducing the construction risk are achieved.

2. The invention can be applied to various underground engineering by the underground excavation method according to the requirement, and is more suitable for the auxiliary engineering with larger section of the part connected with the main body compared with the traditional underground excavation method, thereby having wider application range.

3. The invention provides the advanced support operation condition for the auxiliary underground excavation construction of the station by adjusting the pilot tunnel space of the main body and the auxiliary interface part, has more flexible applicability and can meet the construction space of various advanced support measures.

Drawings

FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view A-A of FIG. 1 according to the present invention;

FIG. 3 is a schematic cross-sectional view B-B of FIG. 1 according to the present invention;

FIG. 4 is a schematic structural diagram according to a second embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of the device of FIG. 4 taken along line C-C.

In the figure, 1-a station main body standard section pilot tunnel, 2-a station main body transition section pilot tunnel, 3-a station main body expanding excavation section pilot tunnel, 4-a station auxiliary underground excavation section advanced support, 5-a station main body fender post, 6-a station main body fender post top crown beam, 7-a station auxiliary underground excavation section primary support and 8-a station auxiliary underground excavation section secondary lining; 9-pilot support of arch part of pilot tunnel.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

The embodiment of the invention provides a method for constructing an advance support to an auxiliary underground excavation section of a station in an underground excavation station main body pilot tunnel, which comprises the following steps as shown in figures 1-3:

s1: constructing a pilot tunnel arch advanced support 9 above the pilot tunnel 1 of the main standard section of the station, and constructing the pilot tunnel 1 of the main standard section of the station.

S2: and constructing a pilot tunnel arch advanced support 9 above the pilot tunnel 2 of the main transition section of the station, and constructing the pilot tunnel 2 of the main transition section of the station along the pilot tunnel 1 of the standard section of the main body of the station.

S3: constructing a pilot tunnel arch advanced support 9 above a station main body expanded excavation section pilot tunnel 3, constructing the station main body expanded excavation section pilot tunnel 3 along a station main body transition section pilot tunnel 2, and positioning the station main body expanded excavation section pilot tunnel 3 above a station auxiliary underground excavation section. The expanding excavation direction of the station main body expanding excavation section pilot tunnel 3 comprises a right side and a bottom, and the space in the station main body expanding excavation section pilot tunnel 3 needs to meet the construction requirement of the advanced support 4 of the station auxiliary underground excavation section.

S4: the construction station is provided with an auxiliary underground excavation section advanced support 4 and a main body guard pile top crown beam 6.

The pilot support 9 measures of the pilot tunnel arch parts in the steps S1-S3 are reasonably selected according to the characteristics of the stratum and the engineering characteristics.

Example two

The embodiment of the invention provides a method for constructing an advance support to an auxiliary underground excavation section of a station in an underground excavation station main body pilot tunnel, which comprises the following steps as shown in figures 4-5:

s1: constructing a pilot tunnel arch advanced support 9 above the pilot tunnel 1 of the main standard section of the station, and constructing the pilot tunnel 1 of the main standard section of the station.

S2: and constructing a pilot tunnel arch advanced support 9 above the pilot tunnel 2 of the main transition section of the station, and constructing the pilot tunnel 2 of the main transition section of the station along the pilot tunnel 1 of the standard section of the main body of the station.

S3: constructing a pilot tunnel arch advanced support 9 above a station main body expanded excavation section pilot tunnel 3, constructing the station main body expanded excavation section pilot tunnel 3 along a station main body transition section pilot tunnel 2, and positioning the station main body expanded excavation section pilot tunnel 3 above a station auxiliary underground excavation section. The expanding excavation direction of the station main body expanding excavation section pilot tunnel 3 comprises a left side, a right side and a bottom, and the space in the tunnel of the station main body expanding excavation section pilot tunnel 3 needs to meet the construction requirement of the advanced support 4 of the attached underground excavation section of the station.

S4: the construction station is provided with an auxiliary underground excavation section advanced support 4 and a main body guard pile top crown beam 6.

The pilot support 9 measures of the pilot tunnel arch parts in the steps S1-S3 are reasonably selected according to the characteristics of the stratum and the engineering characteristics.

As can be seen from comparison between fig. 3 and fig. 5, the station main body of the first embodiment has a single-column double-span structure, and the station main body of the second embodiment has a double-column three-span structure. The station main body enlarged excavation section pilot tunnel 3 only exists above the station auxiliary underground excavation section, and pilot tunnels at other positions do not need to be enlarged and excavated. And the expanding excavation direction is according to the construction condition, and the space in the hole of the expanded excavation section pilot tunnel 3 of the expanded excavation station main body meets the construction requirement of the advanced support 4 of the auxiliary underground excavation section of the station. In the construction process of the underground excavation station, the guide holes above the station and the auxiliary interfaces are utilized, and the guide holes are expanded and excavated to provide construction space for advanced supports 4 (pipe sheds, advanced guide pipes, advanced anchor rods and the like) of auxiliary underground excavation sections of the station, so that an underground excavation construction working surface facing an auxiliary structure in a station main body is provided during auxiliary construction, the auxiliary construction period of the station is optimized, the construction cost is saved, and the construction risk is reduced.

The present invention has been described in detail with reference to the embodiments, but the description is only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The scope of the invention is defined by the claims. The technical solutions of the present invention or those skilled in the art, based on the teaching of the technical solutions of the present invention, should be considered to be within the scope of the present invention, and all equivalent changes and modifications made within the scope of the present invention or equivalent technical solutions designed to achieve the above technical effects are also within the scope of the present invention.