CN212250050U - Super-close vertical crossing cavern of high ground stress soft rock stratum - Google Patents
Super-close vertical crossing cavern of high ground stress soft rock stratum Download PDFInfo
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- CN212250050U CN212250050U CN202022301752.5U CN202022301752U CN212250050U CN 212250050 U CN212250050 U CN 212250050U CN 202022301752 U CN202022301752 U CN 202022301752U CN 212250050 U CN212250050 U CN 212250050U
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Abstract
The application provides an ultra-close connection grade crossing cavern of a high ground stress soft rock stratum, which relates to the technical field of railway tunnel construction and comprises an existing tunnel, a first parallel evacuation pilot hole and a second evacuation pilot hole which are arranged at two sides outside the existing tunnel, wherein the first parallel evacuation pilot hole and the second evacuation pilot hole are respectively communicated with the existing tunnel through a plurality of horizontal evacuation communication channels, an auxiliary transverse hole leading to the outside of the existing tunnel and the first parallel evacuation pilot hole are positioned at the same side and communicated with the same side, the ultra-close connection grade crossing cavern also comprises a tunnel bottom evacuation communication man channel used for communicating the second evacuation pilot hole and the auxiliary transverse hole, the tunnel bottom evacuation communication man channel is arranged below the existing tunnel and is crossed with the existing tunnel at zero clear distance, the gradient of the tunnel bottom evacuation communication man channel is reduced, the level is approximate, the escape difficulty of train personnel is reduced, the escape probability is increased, and the construction difficulty and construction engineering quantity are also reduced by the design, the construction period is shortened.
Description
Technical Field
The application relates to the technical field of railway tunnel construction, in particular to an ultra-close grade crossing cavern of a high ground stress soft rock stratum.
Background
When the evacuation contact pedestrian passageway at the bottom of the tunnel is designed and constructed, the gradient of the evacuation contact pedestrian passageway is gradually reduced, the escape success rate of train personnel is facilitated, the construction difficulty of the tunnel is reduced, and the construction period of the whole tunnel is shortened.
Under some special geological conditions, three-dimensional cross caverns are constructed, such as YunTu tunnel of a blue railway, which are arranged in the south-north direction on the right side of Minjiang (fracture), and the tunnel zone is arranged in a terrain sharp zone on the east side of Sichuan basin and Qinghai-Tibet plateau, and the geological structures belong to the northwest-Sichuan A-shaped structure consisting of Longmen mountain fold fracture zone, Xiqinling ridge fold fracture zone and Minjiang fracture, and have the geological characteristics of 'four poles three-high five-complex' (four poles: extremely strong terrain cutting, extremely complex and active constructional conditions, extremely weak and broken lithologic conditions, extremely obvious seismic effect; three-high: high crustal stress, high seismic intensity, high geological disaster risk; five-complex: complex constructional motion history, complex constructional traces, complex and changeable complex tectonic rock construction, complex geostress environment and complex groundwater conditions), and the lithology of the whole construction environment is thousand rock, Under the condition that the strength of rocks such as carbon phyllite and the like is less than 5MPa, the group-hole effect is easy to occur, stress redistribution can be caused when a new structure is constructed under the existing tunnel, soft rock is induced to deform again, the existing tunnel can be influenced, and the difficulty of constructing a cross cavern under the condition of avoiding the group-hole effect and influencing the existing tunnel becomes a project difficulty.
Content of application
An object of this application is to provide a super nearly cross cavern that connects on high ground stress soft rock stratum, its slope that can the evacuation contact pedestrian passageway at the bottom of the effectual reduction tunnel, the probability that great improvement train personnel fleed reduces the construction degree of difficulty.
The embodiment of the application is realized by the following technical scheme:
the utility model provides a super hugging closely intercross grotto in high ground stress soft rock stratum, includes existing tunnel to and locate the sparse pilot tunnel of the first parallel and the sparse pilot tunnel of second of both sides outside existing tunnel, the sparse pilot tunnel of first parallel and the sparse pilot tunnel of second communicate through the sparse contact channel of a plurality of levels respectively existing tunnel, one access to the outer supplementary transverse tunnel of existing tunnel and first parallel sparse pilot tunnel lie in the homonymy and communicate with it, still include the sparse contact man's passageway at the bottom of the tunnel that is used for communicateing the sparse pilot tunnel of second and supplementary transverse tunnel, sparse contact man's passageway at the bottom of the tunnel is located existing tunnel below and zero clear distance intercross with it.
Further, evacuation contact pedestrian's traffic is including the cross section that is located existing tunnel below at the bottom of the tunnel, the cross section is equipped with tunnel hole and pipe canopy, the pipe canopy includes a plurality of steel pipes, a plurality of steel pipes are located tunnel hole top just distributes along its vault.
Furthermore, the central angle of the pipe shed is 100-140 degrees.
Furthermore, the horizontal included angle of the steel pipes of the pipe shed is 2-4 degrees.
Furthermore, the cross section is also provided with a plurality of grouting steel floral tubes which are respectively arranged at two sides of the tunnel hole and are parallel to the existing tunnel.
Furthermore, the cross section comprises a cross section body and two end extension sections arranged at two ends of the cross section body, and a plurality of vertical punching grouting pipes are arranged at the contact ends of the cross section body and the existing tunnel.
Furthermore, the interval between the vertical punching grouting pipes is 70cm-90 cm.
Furthermore, the cross section body is provided with a plurality of door-shaped steel frames which are arranged at intervals along the extending direction of the cross section body.
Furthermore, the cross section body is provided with a pair of concrete backfill blocks, and the pair of concrete backfill blocks are arranged on two sides of the tunnel hole.
The construction method of the ultra-close grade flyover cavern of the high ground stress soft rock stratum comprises the following construction steps:
s1, drilling and grouting from the bottom of an inverted arch primary support of an existing tunnel to a cross section body to manufacture a vertical drilling grouting pipe reinforced rock body;
s2, gradually raising the arch at the starting point of the cross section to create a pipe shed working room, constructing a pipe shed, and grouting the pipe shed at the pressure of 0.8-1.0 MPa;
and S3, adopting mechanical excavation, short footage and strong support for the cross section, and adopting a perforated pipe to carry out radial grouting on the surrounding rock to manufacture a grouting steel perforated pipe to reinforce the surrounding rock mass.
Further, before excavation, the method also comprises the following steps: and (3) carrying out advanced pre-grouting reinforcement on the tunnel face, wherein the grouting reinforcement penetrates through the whole cross section, the hole spacing is 1.5m multiplied by 1.5m, and the peripheral eye distance excavation contour line is 0.5 m.
Optionally, in step S3, the section of the excavation is horseshoe-shaped or rectangular.
Optionally, in the step S3, the excavation section of the extension section is horseshoe-shaped, and the excavation section of the intersecting section body is rectangular.
And S4, constructing a secondary lining on the body of the cross section, arranging a door-shaped steel frame support and backfilling to obtain a tunnel arch bottom space.
Furthermore, the distance between the door-shaped steel frames is 50-60 cm/truss.
The technical scheme of the embodiment of the application has at least the following advantages and beneficial effects:
the application provides a super nearly cross-over cavern in high ground stress soft rock stratum reasonable in design, through the zero clear distance fly-over in evacuation contact pedestrian passageway and existing tunnel at the bottom of the tunnel, reduce the slope of evacuation contact pedestrian passageway at the bottom of the tunnel, can accomplish nearly level, reduced train personnel's the degree of difficulty of fleing, increased the probability of fleing, this design has also reduced the construction degree of difficulty and construction work volume simultaneously, has shortened construction cycle.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a cross-cavern provided in an embodiment of the present disclosure;
FIG. 2 is a first construction process diagram provided in an embodiment of the present application;
FIG. 3 is a second construction process diagram provided in the embodiments of the present application;
FIG. 4 is a third construction process diagram provided in the embodiments of the present application;
FIG. 5 is a fourth construction process diagram provided in the embodiments of the present application;
FIG. 6 is a fifth construction process diagram provided in the embodiments of the present application;
FIG. 7 is a sixth construction process diagram provided in an embodiment of the present application;
icon: 1-existing tunnel, 2-evacuation contact pedestrian passage at the bottom of the tunnel, 21-cross section, 211-cross section body, 212-extension section, 3-tunnel hole, 4-pipe shed, 5-grouting steel floral tube, and 6-vertical punching grouting tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example 1
As shown in fig. 1, the present embodiment provides an ultra-close connection type grade crossing cavern in a high ground stress soft rock stratum, which includes an existing tunnel 1, and a first parallel evacuation pilot hole and a second evacuation pilot hole which are arranged on two sides outside the existing tunnel 1, wherein the first parallel evacuation pilot hole and the second evacuation pilot hole are respectively communicated with the existing tunnel 1 through a plurality of horizontal evacuation communication channels, an auxiliary cross hole leading to the outside of the existing tunnel 1 and the first parallel evacuation pilot hole are positioned on the same side and are communicated with each other, and the ultra-close connection type grade crossing cavern further includes a bottom evacuation communication channel 2 for communicating the second evacuation pilot hole and the auxiliary cross hole, the bottom evacuation communication channel 2 is arranged below the existing tunnel 1 and is intersected with the existing tunnel 1 at a zero clear distance.
Under special geological conditions, such as the condition that a plurality of fracture zones are staggered, the three-high five-complex four-pole (four-pole: extremely strong terrain cutting, extremely complex and active construction conditions, extremely weak lithologic conditions and extremely obvious earthquake effect; three-high: high crustal stress, high earthquake intensity and high geological disaster risk; five-complex: complex construction movement history, complex construction traces, complex and changeable mulesheet construction, complex ground stress environment and complex groundwater conditions) are provided, the three-high tunnel is manufactured under the condition that the rock strength of the whole construction environment is less than 5MPa, the three-dimensional cross tunnel is easy to generate the group tunnel effect, for this reason, the tunnel bottom evacuation tie traffic comprises a cross section 21 positioned below the existing tunnel 1, the cross section 21 is provided with a tunnel hole 3, a pipe shed 4 and a plurality of grouting steel floral tubes 5, pipe shed 4 includes a plurality of steel pipes, 3 tops in tunnel hole and along its vault distribution are located to a plurality of steel pipes, 3 both sides in tunnel hole and parallel with having the tunnel promptly are located respectively to a plurality of slip casting steel floral tubes 5, cross section 21 includes cross section body 211 and locates the both ends extension section 212 at cross section body 211 both ends, cross section body 211 is equipped with a plurality of vertical slip casting pipes 6 that punch with the contact jaw of existing tunnel 1, design more than adopting, can realize the zero clear distance flyover of two tunnels under the lower condition of geological strength.
In the embodiment, the interval between the vertical punching grouting pipes 6 is 70cm-90cm, specifically 70cm, 75cm, 80cm, 85cm or 90 cm; the central angle of the pipe shed 4 is 100 ° to 140 °, specifically, may be 100 °, 110 °, 120 °, 130 ° or 140 °, and the horizontal included angle of the steel pipe of the pipe shed 4 is 2 ° to 4 °, specifically, may be 2 °, 3 ° or 4 °, which are only used for illustration and are not used to limit the present application, and when other values are used, the implementation of the present application is not affected.
Example 2
Generally, when a multi-layer tunnel is constructed, construction safety and progress can be better guaranteed only by adopting construction from bottom to top, and the embodiment provides a construction method of an ultra-close grade crossing cavern of a high ground stress soft rock stratum provided by the embodiment 1, the method is to construct a lower tunneling bottom evacuation contact man passage 2 which is in grade crossing with the existing tunnel 1 below, and the construction steps are as follows:
s1, drilling and grouting from the bottom of an inverted arch primary support of an existing tunnel 1 to a cross section body 211 to manufacture a vertical punching grouting pipe 6 for reinforcing a rock mass, as shown in a figure 2;
s2, gradually raising the arch at the starting point of the cross section 21 to create a working chamber of the pipe shed 4, constructing the pipe shed 4, and grouting the pipe shed 4 at the pressure of 0.8-1.0 MPa, as shown in figure 3;
and S3, performing advanced pre-grouting reinforcement on the tunnel face, wherein the grouting reinforcement penetrates through the whole cross section 21, the hole spacing is 1.5m multiplied by 1.5m, and the peripheral eye distance excavation contour line is 0.5m, as shown in the figures 4 and 5.
S4, adopting mechanical excavation, short footage and strong support to the cross section 21, and adopting perforated pipes to carry out radial grouting on the surrounding rocks to manufacture grouting steel perforated pipes 5 to reinforce the surrounding rocks, as shown in figures 6 and 7.
The stress redistribution is caused by the construction of a newly built structure under the existing tunnel 1, the soft rock is induced to deform again, and the influence on the existing tunnel 1 is generated, by adopting the design, the newly built tunnel bottom evacuation contact pedestrian passageway 2 under the existing tunnel 1 can be used for reducing the deformation of the soft rock and the influence on the existing tunnel 1, and by adopting the method, the construction safety and the final stability of the whole cavern can be ensured under the condition that the rock strength is less than 5 MPa.
Optionally, in the step S4, the excavated section is a horseshoe shape or a rectangle, when the excavated section of the elected whole section crossing section 21 is a horseshoe shape, since the existing tunnel 1 and the tunnel bottom evacuation contact pedestrian passageway 2 are zero clear distance crossed, at the crossing section body 211, the thickness of the rock layer adhered to the arch bottom of the existing tunnel 1 at the upper end of the crossing section body 211 is very small, which is very easy to collapse and affects the construction, and when the excavated section of the elected whole section crossing section 21 is a rectangle, the top end of the rectangle is adhered to the arch bottom of the existing tunnel 1, and when backfilling is completed after the construction, the backfilling of the two extending sections 212 is complicated.
Further optimally, in the step S4, the excavation section of the extension section 212 is horseshoe-shaped, and the excavation section of the cross section body 211 is rectangular, so that the problems of rock stratum collapse, complicated backfilling and the like caused by independent horseshoe-shaped excavation and rectangular excavation can be solved.
When the excavation section is rectangular, two linings are usually required to be constructed, then door-shaped steel frames are erected for supporting and backfilling the space of the bottom arch of the existing tunnel 1, specifically, the door-shaped steel frames are 50-60 cm/truss, a plurality of I-shaped steel frames are adopted for longitudinally connecting the door-shaped steel frames, the annular distance between the I-shaped steel frames is 1m, and C30 steel fibers are adopted for spraying concrete.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (9)
1. The utility model provides a super nearly crisscross cavern in high ground stress soft rock stratum is applied to the rescue station, the rescue station is including existing tunnel, second evacuation pilot tunnel and supplementary transverse tunnel, its characterized in that: the evacuation communication pedestrian passageway at the bottom of the tunnel is used for communicating the second evacuation pilot tunnel and the auxiliary transverse hole, and the evacuation communication pedestrian passageway at the bottom of the tunnel is arranged below the existing tunnel and is crossed with the existing tunnel at a zero clear distance.
2. The ultra-close grade interbody cavern of high geostress soft rock formations of claim 1, wherein: evacuation contact pedestrian's traffic is including being located the cross section of existing tunnel below at the bottom of the tunnel, the cross section is equipped with tunnel hole and pipe canopy, the pipe canopy includes a plurality of steel pipes, a plurality of steel pipes are located tunnel hole top just distributes along its vault.
3. The ultra-close grade interbody cavern of high geostress soft rock formations of claim 2, wherein: the central angle of the pipe shed is 100-140 degrees.
4. The ultra-close grade interbody cavern of high geostress soft rock formations of claim 2, wherein: the horizontal included angle of the steel pipes of the pipe shed is 2-4 degrees.
5. The ultra-close grade interbody cavern of high geostress soft rock formations of claim 2, wherein: the cross section is also provided with a plurality of grouting steel floral tubes which are respectively arranged at two sides of the tunnel hole and are parallel to the existing tunnel.
6. The ultra-close grade interbody cavern of high geostress soft rock formations of claim 2, wherein: the cross section comprises a cross section body and two end extension sections arranged at two ends of the cross section body, and a plurality of vertical punching grouting pipes are arranged at the contact ends of the cross section body and the existing tunnel.
7. The ultra-close grade interbody cavern of high geostress soft rock formations of claim 6, wherein: the interval between the vertical punching grouting pipes is 70cm-90 cm.
8. The ultra-close grade interbody cavern of high geostress soft rock formations of claim 6, wherein: the cross section body is provided with a plurality of door-shaped steel frames which are arranged at intervals along the extending direction of the cross section body.
9. The ultra-close grade interbody cavern of high geostress soft rock formations of claim 6, wherein: the cross section body is provided with a pair of concrete backfill blocks, and the pair of concrete backfill blocks are arranged on two sides of the tunnel hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022301752.5U CN212250050U (en) | 2020-10-15 | 2020-10-15 | Super-close vertical crossing cavern of high ground stress soft rock stratum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022301752.5U CN212250050U (en) | 2020-10-15 | 2020-10-15 | Super-close vertical crossing cavern of high ground stress soft rock stratum |
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| CN212250050U true CN212250050U (en) | 2020-12-29 |
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