CN212535668U - Widen excavation supporting construction in tunnel unilateral under construction - Google Patents
Widen excavation supporting construction in tunnel unilateral under construction Download PDFInfo
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- CN212535668U CN212535668U CN202020374628.9U CN202020374628U CN212535668U CN 212535668 U CN212535668 U CN 212535668U CN 202020374628 U CN202020374628 U CN 202020374628U CN 212535668 U CN212535668 U CN 212535668U
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Abstract
The utility model discloses an widen excavation supporting construction in tunnel unilateral under construction for solve under construction tunnel unilateral and widen the construction excavation, just prop up the problem, it adopts the back of the body to encircle and the former tunnel of arc vertical braces temporary reinforcement just props up the part, so as to strengthen former tunnel space stress state, divide into six sections to the tunnel excavation section according to the vertical steel shotcrete of arc, reasonable in order to reach the atress when widening in tunnel unilateral under construction, effectively reduce construction safety risk, the process conversion is reasonable, the efficiency of construction is improved, the construction progress has been guaranteed.
Description
Technical Field
The utility model relates to a tunnel unilateral expands and digs technical field, specifically is a widen excavation supporting construction in tunnel unilateral under construction.
Background
With the continuous perfection and mechanization of the tunnel construction technology, the tunnel construction technology can solve a large number of construction problems, and particularly, the tunnel construction technology for special geology is more and more mature. However, the original design can not meet the condition of future traffic volume, the existing tunnel is a small-clear-distance tunnel, the single-side widening is realized, a mature construction supporting structure is not formed in the industry for the single-side expanding excavation construction of the built tunnel, and the technical safety guarantee measures in the construction are particularly prominent. The original supporting construction supporting structure can not meet the current requirements, the safety guarantee measures can not be guaranteed, and meanwhile, the utilization rate is greatly reduced.
In view of the drawback that above-mentioned traditional supporting construction exists, the utility model discloses based on the practice experience that relies on many years richly of this type of product engineering trade of pursuing to combine the application of theoretical knowledge, actively study the innovation, the utility model discloses a widen excavation supporting construction in tunnel unilateral under construction.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a widen excavation supporting construction in tunnel unilateral under construction to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a widened excavation supporting structure for one side of a tunnel under construction comprises an old tunnel main tunnel consisting of four areas of an old tunnel main tunnel upper right half-section, an old tunnel main tunnel lower right half-section, an old tunnel main tunnel upper left half-section and an old tunnel main tunnel lower left half-section, and also comprises a new tunnel main tunnel consisting of an old tunnel main tunnel upper right half-section, an old tunnel main tunnel lower right half-section, an old tunnel main tunnel upper left half-section, an old tunnel main tunnel lower left half-section, an upper widening surface and a lower widening surface of a widening side, wherein a plurality of back arches are arranged in the old tunnel main tunnel at equal intervals, an upper half primary support of the new tunnel main tunnel is arranged in the old tunnel main tunnel upper right half-section area, an arc vertical upper support and a horizontal support connecting piece are arranged, a lower half support of the new tunnel main tunnel is arranged in the old tunnel main tunnel lower right half-section area, and an arc vertical lower support is arranged, and arranging an upper half primary support of a new tunnel main hole facing empty surface in the upper left half section area of the old tunnel main hole, arranging a lower half primary support of a new tunnel main hole facing empty surface in the lower left half section area of the old tunnel main hole, and respectively installing an upper half primary support of a new tunnel main hole widening surface and a lower half primary support of a new tunnel main hole widening surface on the upper widening surface and the lower widening surface.
Preferably, six areas, namely the upper right half section of the old tunnel main hole, the lower right half section of the old tunnel main hole, the upper left half section of the old tunnel main hole, the lower left half section of the old tunnel main hole and the upper widening surface and the lower widening surface of the widening side are separated by the central line of the arc-shaped vertical upper support, the arc-shaped vertical lower support and the vertical support transverse connecting piece.
Preferably, the shape of the back arch is the same as the shape of the original primary support of the old tunnel main hole, and the back arch is tightly attached to the original primary support.
Preferably, the back arch is of a profile steel structure, the back arch and the back arch are welded by using deformed steel bars, and the arch foot at the bottom end of the back arch is positioned on the cushion layer.
Preferably, the upper half primary support of the new tunnel main hole, the lower half primary support of the new tunnel main hole, the upper half primary support of the new tunnel main hole free face, the lower half primary support of the new tunnel main hole free face, the upper half primary support of the new tunnel main hole widened face upper portion and the lower half primary support of the new tunnel main hole widened face lower portion all adopt a profile steel structure.
Preferably, the arc vertical upper support, the arc vertical lower support and the vertical support transverse connecting piece are all of a profile steel structure, and the joints of the arc vertical upper support and the arc vertical lower support, the upper half of a new tunnel main hole, the lower half of the new tunnel main hole, the upper half of a new tunnel main hole face, the lower half of the new tunnel main hole face, the upper half of a new tunnel main hole widened face and the lower half of the new tunnel main hole widened face are connected through bolts.
Compared with the prior art, the beneficial effects of the utility model are that:
according to the atress condition, through arc vertical upper support, the vertical lower bracing vertical braces of arc and transverse connection spare, divide into six sections to the tunnel excavation face, reduce the space stress effect, bolted connection between tunnel primary support and the interim support strengthens overall stability, ensures construction safety.
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 obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is the utility model discloses the overall construction structure sketch map.
In the drawings, the components represented by the respective reference numerals are listed below:
1. the arc-shaped vertical upper support; 2. an arc vertical lower support; 3. a vertical support transverse connector; 4. back arching; 5. the upper half of the main tunnel of the new tunnel is primarily supported; 6. the lower half of the main tunnel of the new tunnel is primarily supported; 7. the upper half of the empty face of the main hole of the new tunnel is primarily supported; 8. the lower half of the empty face of the main hole of the new tunnel is primarily supported; 9. the upper half primary support of the new tunnel main hole widened surface; 10. the lower half primary support of the lower part of the widened surface of the main tunnel of the new tunnel; 11. a new tunnel main hole; 12. the upper right half primary support of the old tunnel main hole; 13. the lower right half primary support of the old tunnel main tunnel; 14. the upper left half of the main tunnel of the old tunnel is primarily supported; 15. the left lower half primary support of the old tunnel main hole; 16. and (5) main holes of the old tunnel.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Example 1
Referring to fig. 1-2, the present invention provides a technical solution: a widened excavation supporting structure for one side of a tunnel under construction, as shown in a dotted line part of figure 2, an old tunnel main hole 16 consisting of four areas of an old tunnel main hole upper right half-section, an old tunnel main hole lower right half-section, an old tunnel main hole upper left half-section and an old tunnel main hole lower left half-section, and a new tunnel main hole 11 consisting of an old tunnel main hole upper right half-section, an old tunnel main hole lower right half-section, an old tunnel main hole upper left half-section, an old tunnel main hole lower left half-section, an upper widening surface and a lower widening surface of a widening side, wherein a plurality of back arches 4 are arranged in the old tunnel main hole 16 at equal intervals, and the shape of each back arch 4 is the same as that of an original tunnel main hole 16 and is tightly attached to the original support; the back arch 4 is of a profile steel structure and is welded with each other by adopting deformed steel bars, and the bottom arch foot of the back arch 4 is positioned on the cushion layer. Old tunnel main hole upper right half section region set up new tunnel main hole upper half and just prop 5 to install the vertical upper support of arc 1 of vertical setting and the vertical braces transverse connection piece 3 of horizontal setting old tunnel main hole lower right half section region set up new tunnel main hole lower half and just prop 6 to vertically install vertical under bracing of arc 2, six regions of upper portion widen face and the lower portion widen face of old tunnel main hole upper right half section, old tunnel main hole lower right half section, old tunnel main hole upper left half section, old tunnel main hole lower left half section and widen side are separated through the vertical central line that upwards supports 1, vertical under bracing of arc 2 and vertical braces transverse connection piece 3 of arc. And arranging an upper half primary support 7 of a new tunnel main hole facing empty surface in the upper left half section area of the old tunnel main hole, arranging a lower half primary support 8 of the new tunnel main hole facing empty surface in the lower left half section area of the old tunnel main hole, and respectively installing an upper half primary support 9 of a new tunnel main hole widening surface and a lower half primary support 10 of a new tunnel main hole widening surface on the upper widening surface and the lower widening surface.
Wherein, the upper half primary support 5 of the new tunnel main hole, the lower half primary support 6 of the new tunnel main hole, the upper half primary support 7 of the new tunnel main hole face, the lower half primary support 8 of the new tunnel main hole face, the upper half primary support 9 of the new tunnel main hole widening face upper part and the lower half primary support 10 of the new tunnel main hole widening face lower part all adopt a profile steel structure.
The novel tunnel is characterized in that the arc vertical upper support 1, the arc vertical lower support 2 and the vertical support transverse connecting piece 3 are all of a profile steel structure, the vertical support arc is obtained by calculation according to stress generated in tunnel construction and rock mass pressure, and the joints of the arc vertical upper support 1 and the arc vertical lower support 2, the upper half primary support 5 of the new tunnel main hole, the lower half primary support 6 of the new tunnel main hole, the upper half primary support 7 of the new tunnel main hole facing empty surface, the lower half primary support 8 of the new tunnel main hole facing empty surface, the upper half primary support 9 of the new tunnel main hole widened surface upper portion and the lower half primary support 10 of the new tunnel main hole widened surface are connected through bolts.
Example two
The utility model discloses a widen excavation supporting construction's concrete construction method in tunnel unilateral under construction, including following step:
s1: after the construction of the advanced large pipe shed of the new tunnel, installing a plurality of arc-shaped back arches 4 on the primary support of the old tunnel at equal intervals, and measuring the arcs at the installation part before installation to ensure that the back arches 4 are tightly attached to the primary support of the old tunnel;
s2: and (3) removing the upper half primary support 12 of the main hole of the old tunnel by adopting a breaking hammer and manual cooperation, and preferentially cutting the reinforcing mesh and the connecting ribs when the reinforcing mesh or the connecting concrete surface is removed, so as to ensure that the residual concrete can be chiseled after all the reinforcing mesh and the connecting ribs are cut. And cutting the existing reinforcing mesh and connecting ribs by adopting water welding in the process of removing the sprayed concrete. Ensuring that the stress of the existing arch frame is not damaged. And excavating and supporting the upper half primary support 5 of the main tunnel of the new tunnel after the tunnel is dismantled, and reserving a reserved settlement amount after the tunnel is expanded and excavated to a design contour line. After a new tunnel arch frame is installed, installing an arc-shaped vertical upper support 1 and a vertical support transverse connecting piece, and sticking a monitoring measuring chip;
s3: removing the lower right half primary support 13 of the old tunnel main hole, supporting the lower half primary support 6 of the new tunnel main hole after excavation, and installing the arc-shaped vertical lower support 2;
s4: removing the upper left half primary support 14 of the old tunnel main tunnel, and supporting the upper half primary support 7 of the free face of the new tunnel main tunnel after excavation;
s5: removing the lower left half primary support 15 of the old tunnel main tunnel, and supporting the lower half primary support 8 of the free face of the new tunnel main tunnel after excavation;
s6: excavating and supporting an upper widening surface of a widening side of a main tunnel 11 of the new tunnel, and supporting an upper half primary support 9 of the upper part of the widening surface of the main tunnel of the new tunnel;
s7: excavating and supporting a lower widening surface of a widening side of a main tunnel 11 of the new tunnel, and supporting a lower half primary support 10 of the lower part of the widening surface of the main tunnel of the new tunnel;
s8: and after the deformation of the main hole 11 of the new tunnel is stabilized, dismantling and recovering the arc-shaped vertical upper support 1, the arc-shaped vertical lower support 2 and the vertical support transverse connecting piece 3.
For the six excavation surfaces, in order to reduce excavation sections, the construction sequence is that firstly the most stressed part and the weakest part of the arch crown are excavated, then the parts of the adjacent empty surfaces (the upper widening surface and the lower widening surface) of the old tunnel are excavated, and finally the widening part is excavated, so that the primary support and the rock mass stability of the old tunnel are enhanced, and the space stress condition is increased.
When four parts, namely an upper right half primary support 12 of an old tunnel main hole, a lower right half primary support 13 of the old tunnel main hole, an upper left half primary support 14 of the old tunnel main hole and a lower left half primary support 15 of the old tunnel main hole 16 are removed, the old tunnel main hole is broken and removed by adopting a manual pneumatic pick together with machinery, when steel materials are removed to the primary support, the steel materials are preferentially cut off, and the residual concrete can be removed by chiseling after all the steel materials are cut off.
And when the upper widening surface and the lower widening surface of the widening side are excavated, the blasting shape and the blasting parameters are formulated according to the shape of the excavated surface and the monitoring and measuring data.
And the safety distance of the upper half primary support 5 of the new tunnel main hole, the lower half primary support 6 of the new tunnel main hole, the upper half primary support 7 of the empty face of the new tunnel main hole, the lower half primary support 8 of the empty face of the new tunnel main hole, the upper half primary support 9 of the widened face upper part of the new tunnel main hole and the lower half primary support 10 of the widened face lower part of the new tunnel main hole is determined according to the surrounding rock deformation allowance and vault subsidence monitoring measurement data and adjusted in real time.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. 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 its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (6)
1. The utility model provides a widen excavation supporting construction in tunnel unilateral under construction, includes by old tunnel main tunnel upper right half section, old tunnel main tunnel lower right half section, old tunnel main tunnel upper left half section and old tunnel main tunnel lower left half section four regional old tunnel main tunnel (16) of constituteing, its characterized in that: the tunnel comprises a tunnel main hole (11) consisting of an upper right half section of an old tunnel main hole, a lower right half section of the old tunnel main hole, an upper left half section of the old tunnel main hole, a lower left half section of the old tunnel main hole, an upper widening surface and a lower widening surface of a widening side, a plurality of back arches (4) are arranged in the old tunnel main hole (16) at equal intervals, an upper half primary support (5) of the new tunnel main hole is arranged in the upper right half section area of the old tunnel main hole, a vertically arranged arc-shaped vertical upper support (1) and a horizontally arranged vertical support transverse connecting piece (3) are arranged, a lower half primary support (6) of the new tunnel main hole is arranged in the lower right half section area of the old tunnel main hole, an arc-shaped vertical lower support (2) is vertically arranged, an upper half primary support (7) of the new tunnel main hole is arranged in the upper left half section area of the old tunnel main hole, a lower half section area of the new tunnel primary hole primary lower half support (8) is arranged in the lower left half section area of the old tunnel main hole, and an upper half primary support (9) at the upper part of the new tunnel main hole widening surface and a lower half primary support (10) at the lower part of the new tunnel main hole widening surface are respectively arranged on the upper widening surface and the lower widening surface.
2. The single-side widening excavation supporting structure of the construction tunnel according to claim 1, wherein: six areas, namely the upper right half section of the old tunnel main hole, the lower right half section of the old tunnel main hole, the upper left half section of the old tunnel main hole, the lower left half section of the old tunnel main hole, the upper widening surface and the lower widening surface of the widening side are separated by the middle line of the arc-shaped vertical upper support (1), the arc-shaped vertical lower support (2) and the vertical support transverse connecting piece (3).
3. The single-side widening excavation supporting structure of the construction tunnel according to claim 1, wherein: the shape of the back arch (4) is the same as the shape of the original primary support of the old tunnel main hole (16), and the back arch is tightly attached to the original primary support.
4. The single-side widening excavation supporting structure of the construction tunnel according to claim 1, wherein: the back arch (4) is of a profile steel structure, the back arch and the back arch are welded by adopting deformed steel bars, and the bottom arch springing of the back arch (4) is positioned on the cushion layer.
5. The single-side widening excavation supporting structure of the construction tunnel according to claim 1, wherein: the upper half primary support (5) of the new tunnel main hole, the lower half primary support (6) of the new tunnel main hole, the upper half primary support (7) of the new tunnel main hole facing empty surface, the lower half primary support (8) of the new tunnel main hole facing empty surface, the upper half primary support (9) of the new tunnel main hole widened surface upper portion and the lower half primary support (10) of the new tunnel main hole widened surface lower portion all adopt a profile steel structure.
6. The single-side widening excavation supporting structure of the construction tunnel according to claim 1, wherein: arc vertical upper support (1), arc vertical lower support (2) and vertical support transverse connection spare (3) all adopt the shaped steel structure, arc vertical upper support (1) and arc vertical lower support (2) and new tunnel main hole first (5), new tunnel main hole second first (6), new tunnel main hole face empty face first (7), new tunnel main hole face empty face second first (8), new tunnel main hole widen first (9) on face upper portion and new tunnel main hole widen the junction of face lower part first (10) and adopt bolted connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020374628.9U CN212535668U (en) | 2020-03-23 | 2020-03-23 | Widen excavation supporting construction in tunnel unilateral under construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020374628.9U CN212535668U (en) | 2020-03-23 | 2020-03-23 | Widen excavation supporting construction in tunnel unilateral under construction |
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| Publication Number | Publication Date |
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| CN212535668U true CN212535668U (en) | 2021-02-12 |
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| CN202020374628.9U Active CN212535668U (en) | 2020-03-23 | 2020-03-23 | Widen excavation supporting construction in tunnel unilateral under construction |
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