阅读说明：本技术 多洞室暗挖通道切割穿越既有竖井的施工方法 (Construction method for cutting multi-chamber underground excavation channel to penetrate through existing vertical shaft ) 是由 张金伟 马铭泽 徐骞 唐云沙 杨斌斌 刘志广 张美琴 张存 高菊英 康宁 李佳庆 于 2021-09-15 设计创作，主要内容包括：本发明提供了一种多洞室暗挖通道切割穿越既有竖井的施工方法,多洞室暗挖横通道开挖至既有竖井外皮处,临时封闭掌子面,封闭掌子面后暂停开挖；开挖切割既有竖井影响区域之外的横通道部分,并至既有竖井影响区域之外,然后自本开挖分部逐渐向另外分部成喇叭口开挖,并将影响范围内的开挖分部采用型钢进行临时支护；在已经封闭成环的通道内破除喇叭口处的型钢,反向开挖通道需要切割既有竖井的分部,至既有竖井外皮,贴邻既有竖井外皮处采用型钢支护；将剩余横通道与既有竖井之间部分使用喇叭口开挖的方式施作完成,横通道通过既有竖井。本发明解决了多洞室暗挖通道与既有竖井冲突导致的安全、工期等问题,保证了施工安全,提高施工效率。(The invention provides a construction method for cutting and penetrating an existing vertical shaft through a multi-chamber underground excavation channel, wherein the multi-chamber underground excavation transverse channel is excavated to the outer skin of the existing vertical shaft, the tunnel face is temporarily closed, and the excavation is suspended after the tunnel face is closed; excavating and cutting a transverse passage part outside an existing shaft influence area to the outside of the existing shaft influence area, then gradually excavating from the excavation subsection to the other subsection to form a bell mouth, and temporarily supporting the excavation subsection within the influence range by adopting section steel; the section steel at the bell mouth is broken in the closed annular channel, the reverse excavation channel needs to cut the subsection of the existing shaft until the outer skin of the existing shaft is cut, and the section steel is supported by the section steel adjacent to the outer skin of the existing shaft; and (4) completing construction of a part between the residual transverse channel and the existing vertical shaft by using a bell mouth excavation mode, wherein the transverse channel passes through the existing vertical shaft. The method solves the problems of safety, construction period and the like caused by the conflict between the underground excavated channels of the multiple caverns and the existing vertical shaft, ensures the construction safety and improves the construction efficiency.)

1. A construction method for cutting and penetrating an existing vertical shaft through an underground excavation channel of a multi-cavern is characterized by comprising the following steps:

step S1: firstly, excavating a non-affected area positioned in front of an existing shaft to the outer skin of the existing shaft, temporarily sealing the tunnel face, and suspending excavation after sealing the tunnel face; the excavation of the underground excavation transverse passage of the multi-cavern adopts a CRD construction method, and the section of the transverse passage is divided into a plurality of subsections;

step S2: excavating and cutting a transverse passage part outside an influence area of the existing vertical shaft to an influence-free area behind the existing vertical shaft, gradually excavating from the excavation subsection to the other subsection to form a bell mouth, and temporarily supporting the excavation subsection of the area within the influence range behind the vertical shaft by adopting profile steel;

step S3: the section steel at the bell mouth is broken in the closed annular transverse passage, the transverse passage behind the existing shaft is reversely excavated, the subsection of the existing shaft needs to be cut, the existing shaft is covered to the outer skin of the existing shaft, and the section steel is supported at the position close to the outer skin of the existing shaft;

step S4: and (3) performing excavation on the part between the residual transverse channel positioned in front of the existing vertical shaft and the existing vertical shaft by using a bell mouth, wherein the transverse channel passes through the existing vertical shaft.

2. The construction method for cutting the underground excavated tunnel through the existing shaft according to claim 1, wherein if the existing shaft is a abandoned shaft, the step S5 is performed after the step S4: backfilling the inside of the existing vertical shaft from the bottom of the shaft to the bottom elevation of the transverse passage structure, designing the size of a primary support structure according to the design elevation of the undercut transverse passage, additionally erecting the primary support structure of the transverse passage in the shaft, breaking the existing vertical shaft penetrating through the influence range in the erecting process, forming a ring according to the design of the primary support of the transverse passage, continuously breaking the existing vertical shaft penetrating through the influence range in the cutting process, and completing the secondary lining structure of the undercut transverse passage of the multi-cavern to complete the construction of the transverse passage.

3. The method as claimed in claim 2, wherein if the abandoned existing shaft is provided with a secondary liner structure, the secondary liner structure and the primary support structure of the shaft are broken and the primary support structure of the transverse passage is additionally erected in the shaft when the existing shaft is backfilled to the level of the bottom of the primary support structure of the underground transverse passage after the cutting and crossing are completed.

4. The method as claimed in claim 1, wherein the cross-section of the underground excavated cross-section of the multi-chamber is divided into six parts, and the arrangement is three layers up and down and two rows left and right.

Technical Field

The invention belongs to the technical field of building structure engineering, and particularly relates to a construction method for cutting and penetrating through an existing vertical shaft by using a multi-chamber underground excavation channel.

Background

The multi-cavern underground excavation channel is used as a subway station construction channel or a permanent structure component of the subway station (such as an air duct, an access and the like), and construction is carried out according to the requirement of a construction period. The existing shaft is used as an operation channel for subway station construction, and meanwhile, operation and use are required according to the requirement of a construction period. The application of the underground excavation channel in the current rail transit field is gradually increased, and under the premise that the ground condition is harsh and open excavation construction is not performed, the underground excavation method is mostly adopted for construction. And (4) excavating the station after a vertical shaft is required to be arranged in the underground excavated station. Under the condition of tense ground conditions, the construction and structure mode of the underground excavation transverse passage is adopted when the station accessories and the like are connected with the station main body. At the moment, the phenomenon that the underground excavation channel of the multiple caverns conflicts with the existing vertical shaft occurs. Therefore, based on the basic fact that the existing conflict situations of the vertical shaft structure and the transverse passage structure are more and more, a set of building structure and a construction method suitable for the situations are sought for ensuring that the station construction is not influenced and simultaneously the permanent structure also meets the requirements of safety, engineering and the like. The construction period of the underground excavation channel and the construction period of the existing vertical shaft are prevented from being influenced mutually, the safety problem caused by improper treatment of the construction nodes of the underground excavation channel and the existing vertical shaft is avoided, and the requirements of safety and quickness of subway construction are met.

Disclosure of Invention

In order to solve the technical problems, the embodiment of the invention provides a construction method for cutting a multi-cavern underground excavation channel to penetrate through an existing vertical shaft, so that the problems of safety, construction period and the like caused by the conflict between the multi-cavern underground excavation channel and the existing vertical shaft are solved, the construction safety is ensured, and the construction efficiency is improved.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:

the embodiment of the invention also provides a construction method for cutting and penetrating through the existing vertical shaft by the underground excavation channel of the multi-cavern, which comprises the following steps:

step S1: firstly, excavating a non-affected area positioned in front of an existing shaft to the outer skin of the existing shaft, temporarily sealing the tunnel face, and suspending excavation after sealing the tunnel face; the excavation of the underground excavation transverse passage of the multi-cavern adopts a CRD construction method, and the section of the transverse passage is divided into a plurality of subsections;

step S2: excavating and cutting a transverse passage part outside an influence area of the existing vertical shaft to an influence-free area behind the existing vertical shaft, gradually excavating from the excavation subsection to the other subsection to form a bell mouth, and temporarily supporting the excavation subsection of the area within the influence range behind the vertical shaft by adopting profile steel;

step S3: the section steel at the bell mouth is broken in the closed annular transverse passage, the transverse passage behind the existing shaft is reversely excavated, the subsection of the existing shaft needs to be cut, the existing shaft is covered to the outer skin of the existing shaft, and the section steel is supported at the position close to the outer skin of the existing shaft;

step S4: and (3) performing excavation on the part between the residual transverse channel positioned in front of the existing vertical shaft and the existing vertical shaft by using a bell mouth, wherein the transverse channel passes through the existing vertical shaft.

Further, if the existing shaft is a discard shaft, step S5 is performed after step S4: backfilling the inside of the existing vertical shaft from the bottom of the shaft to the bottom elevation of the transverse passage structure, designing the size of a primary support structure according to the design elevation of the underground-excavated transverse passage, additionally erecting the primary support structure of the transverse passage in the shaft, breaking the existing vertical shaft penetrating through the influence range by cutting in the erecting process, forming a ring by designing the primary support structure of the transverse passage, continuously breaking the existing vertical shaft penetrating through the influence range by cutting, and finishing the secondary lining structure of the underground-excavated transverse passage of the multi-cavern to finish the construction of the transverse passage.

Further, if the abandoned existing vertical shaft is provided with a secondary lining structure, after the cutting and crossing are completed, when the existing vertical shaft is backfilled to the elevation position at the bottom of the primary support structure of the underground excavated transverse channel, the secondary lining structure and the primary support structure of the vertical shaft are broken, and the primary support structure of the transverse channel is additionally erected in the well.

Furthermore, the cross section of the underground excavated transverse passage of the multi-cavern is divided into six subsections, and the arrangement mode is three layers at the upper part and two rows at the left part and the right part.

The invention has the following beneficial effects:

according to the construction method for cutting and penetrating the existing vertical shaft through the multi-chamber underground excavation channel, the transverse channel passes through the existing vertical shaft and is normally constructed through the rear transverse channel, and meanwhile, the function of the existing vertical shaft is not influenced to be normally played. When the existing vertical shaft is the vertical shaft in use, the construction method can meet the functional requirements of the vertical shaft in use, and can also meet the requirements of construction period, safety quality and safety of the multi-chamber underground excavation channel. When the existing vertical shaft is not used, backfilling is carried out from the bottom of the vertical shaft to the bottom elevation of the transverse passage structure, the existing vertical shaft in the cutting and crossing influence range is broken, and a transverse passage primary support structure and a transverse passage secondary support structure are additionally erected in the vertical shaft according to the design primary support size of the transverse passage.

The design construction method solves the problem that the underground excavation channel of the multi-cavern meets the cutting crossing structure of the existing vertical shaft and is extremely difficult to construct, ensures the normal construction of the self engineering, and simultaneously does not affect the function of the vertical shaft. The method solves the problems of construction period delay and structure safety risk increase caused by the conflict between the existing underground excavation transverse passage and the existing vertical shaft due to difficult land utilization or other objective conditions. The requirements on the function and the structure safety of the vertical shaft in use are met, and meanwhile, the construction progress requirement of the underground excavation channel of the multi-cavern is also met.

The invention solves the problems that the traditional multi-chamber underground excavation channel and the existing vertical shaft are cut and penetrated, and the transverse channel can be constructed only after the existing vertical shaft is completed and backfilled, so that the construction period is prolonged, and the construction efficiency is reduced. Aiming at the cutting and crossing of the underground excavation channel of the multi-cavern and the existing vertical shaft, the underground excavation channel and the existing vertical shaft can be constructed simultaneously, the structural safety of the underground excavation channel and the existing vertical shaft is ensured, the construction efficiency is improved, and the construction period is shortened. The invention is suitable for all multi-chamber underground excavation channels and existing vertical shaft cutting crossing construction, and has wide application range.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present invention.

Fig. 1 is a plan view of a multi-chamber underground excavation passage and existing shaft cutting traversing structure provided by an embodiment of the invention;

fig. 2 is a plan view of a multi-chamber undercut passage, existing shaft cut-through structure at the end of the first step provided by the embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line 1-1 of FIG. 2;

fig. 4 is a plan view of a multi-chamber undercut passage, existing shaft cut-through structure at the end of step two provided by the embodiment of the present invention;

FIG. 5 is a cross-sectional view taken along line 2-2 of FIG. 4;

FIG. 6 is a cross-sectional view taken along line 3-3 of FIG. 4;

fig. 7 is a plan view of a multi-chamber undercut passage, existing shaft cut-through structure at the end of step three provided by an embodiment of the present invention;

fig. 8 is a plan view of a multi-chamber undercut passage, existing shaft cut-through structure at the end of step four provided by an embodiment of the present invention;

fig. 9 is a plan view of a multi-chamber undercut passage, existing shaft cut-through structure at the end of step five provided by an embodiment of the present invention.

Description of reference numerals:

100. an existing shaft; 200. a multi-chamber underground transverse channel is provided.

Detailed Description

In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The embodiment also provides a construction method for cutting and traversing an existing shaft through a multi-chamber underground excavation channel, as shown in fig. 1 to 9, the method comprises the following steps:

step S1: firstly, excavating a non-affected area (i.e. an area I) in front of the existing shaft 100 to the outer skin of the existing shaft 100, temporarily closing the tunnel face, and suspending excavation after closing the tunnel face, as shown in fig. 2; the CRD construction method is adopted for excavating the multi-cavern underground excavation transverse passage 200, the cross section of the transverse passage is divided into six subsections, the arrangement mode is three layers up and down and two rows left and right, the standard primary section of the multi-cavern underground excavation transverse passage 200 is shown in figure 3, and the excavating process comprises the following steps: phi, and phi, and phi, and phi, and phi, and phi, where, phi, and phi, where, phi, where, phi, where, phi, where, phi, where, are, where, are, and phi, where, are, where, or, where, are, where, are, where, phi, where, are, where, the phi, are, where, are, where, the phi, where, the phi.

Step S2: as shown in fig. 4, the excavation cuts the cross passage portion outside the affected area of the existing shaft 100, i.e., the area II, and the section is as shown in fig. 5, the excavation proceeds to the unaffected area located behind the existing shaft 100, then the excavation is gradually excavated from the excavation subsection to another subsection with a bell mouth, and the excavation subsection located in the affected area behind the existing shaft 100 is temporarily supported by using the section steel, and the section is as shown in fig. 6.

Step S3: the section steel at the bell mouth is broken in the transverse passage which is sealed into a ring, the transverse passage behind the existing shaft 100 is reversely excavated, the subsection of the existing shaft 100 is cut until the outer skin of the existing shaft 100 is reached, the outer skin of the existing shaft 100 is supported by the section steel at the position close to the outer skin of the existing shaft 100, and the excavation range is a III area, as shown in fig. 7.

Step S4: the remaining cross passage in front of the existing shaft 100 and the portion between the existing shaft 100 are implemented by bell mouth excavation, the excavation area is an area iv, as shown in fig. 8, and the cross passage passes through the existing shaft 100.

The construction method solves the structural conflict between the existing vertical shaft 100 and the multi-chamber underground-excavated transverse passage 200, and when the existing vertical shaft 100 is the vertical shaft in use, the construction method can meet the functional requirements of the vertical shaft in use and can also meet the requirements of construction period, safety quality and safety of the multi-chamber underground-excavated passage.

Further, if the existing shaft 100 is a discard shaft, step S5 is performed after step S4.

Step S5: backfilling the interior of the existing vertical shaft 100 from the bottom of the shaft to the bottom elevation of the transverse passage structure, designing the size of a primary support structure according to the design elevation of the underground-excavated transverse passage, additionally erecting the primary support structure of the transverse passage in the shaft, breaking the existing vertical shaft 100 penetrating through the influence range by cutting in the erecting process, forming a ring of the primary support structure of the transverse passage according to the design, continuously breaking the existing vertical shaft 100 penetrating through the influence range by cutting, completing a secondary lining structure of the underground-excavated transverse passage of the multi-cavern, and completing construction of the transverse passage, as shown in fig. 9.

Further, the construction method for cutting and penetrating the existing vertical shaft through the multi-chamber underground excavation channel is also suitable for cutting and penetrating the vertical shaft with the two-lining structure, after the cutting and penetrating are completed, when the position of the height of the bottom of the primary support of the underground excavation channel is backfilled in the waste vertical shaft, the secondary lining and the primary support structure of the vertical shaft are broken, and the primary support structure of the transverse channel is additionally erected in the vertical shaft.

Further, the dimensions of the existing shaft 100 are 5m long by 8m wide; the width of the transverse channel is 6-8 m, and the height of the transverse channel is 9-12 m; the width of each part is 3-4 m, and the height is 3-4 m.

The cutting of the multi-chamber underground excavation channel passes through the existing vertical shaft, and can be partially cut, and simultaneously can also completely comprise cutting, if the cutting-containing condition is generated, the cutting-passing problem can be divided into a left cutting-passing part and a right cutting-passing part, and the rest steps are executed.

The construction method for cutting the underground excavated channel of the multi-cavern to penetrate through the existing vertical shaft is also suitable for the construction method for cutting the underground excavated channel of the single cavern to penetrate through the existing vertical shaft.

According to the technical scheme, the construction method for cutting and penetrating the existing vertical shaft through the multi-chamber underground excavation channel is provided, the problems that the multi-chamber underground excavation channel meets the cutting and penetrating structure of the existing vertical shaft and is extremely high in construction are solved, normal construction of self engineering is guaranteed, and meanwhile the function of the vertical shaft is not influenced. The method solves the problems of construction period delay and structure safety risk increase caused by the conflict between the existing underground excavation transverse passage and the existing vertical shaft due to difficult land utilization or other objective conditions. The requirements on the function and the structure safety of the vertical shaft in use are met, and meanwhile, the construction progress requirement of the underground excavation channel of the multi-cavern is also met.

The method solves the problems that the traditional multi-cavern underground excavation channel and the existing vertical shaft are cut and penetrated, and the transverse channel can be constructed only after the existing vertical shaft is completed and backfilled, so that the construction period is prolonged, and the construction efficiency is reduced; the embodiment aims at the cutting and crossing of the underground excavation channel of the multi-cavern and the existing vertical shaft, the underground excavation channel and the existing vertical shaft can be constructed simultaneously, and the structural safety of the underground excavation channel and the existing vertical shaft is ensured. The construction efficiency is improved, and the construction period is shortened. The embodiment is suitable for all multi-chamber underground excavation channels and existing vertical shaft cutting crossing construction, and has a wide application range.

The embodiments of the present invention have been described in detail through the embodiments, but the description is only exemplary of the embodiments of the present invention and should not be construed as limiting the scope of the embodiments of the present invention. The scope of protection of the embodiments of the invention is defined by the claims. In the present invention, the technical solutions described in the embodiments of the present invention or those skilled in the art, based on the teachings of the embodiments of the present invention, design similar technical solutions to achieve the above technical effects within the spirit and the protection scope of the embodiments of the present invention, or equivalent changes and modifications made to the application scope, etc., should still fall within the protection scope covered by the patent of the embodiments of the present invention.