CN211598668U - Semi-open-cut and semi-underground-cut multi-arch tunnel structure - Google Patents
Semi-open-cut and semi-underground-cut multi-arch tunnel structure Download PDFInfo
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- CN211598668U CN211598668U CN202020007306.0U CN202020007306U CN211598668U CN 211598668 U CN211598668 U CN 211598668U CN 202020007306 U CN202020007306 U CN 202020007306U CN 211598668 U CN211598668 U CN 211598668U
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Abstract
The utility model is suitable for the technical field of tunnel engineering, and provides a semi-open-cut and semi-underground-cut multi-arch tunnel structure, which comprises an underground-cut tunnel and an open-cut tunnel; the underground excavation tunnel is located on one side with thick covering soil, the open excavation tunnel is located on one side with thin covering soil, and the underground excavation tunnel and the open excavation tunnel share a middle wall. The cross section of the underground excavated tunnel is C-shaped, and a C-shaped opening extending along the longitudinal direction of the underground excavated tunnel faces the open excavated tunnel; the top wall and the bottom wall of the opening are respectively and fixedly connected with the top and the bottom of the middle wall. The utility model provides a semi-open-cut semi-underground-cut multi-arch tunnel structure and a construction method thereof, wherein an underground-cut tunnel is positioned at one side with thick covering soil, and an open-cut tunnel is positioned at one side with thin covering soil; both share a middle wall. The problem of among the prior art when the steep slope toe department builds the multiple arch tunnel engineering cost high, construction speed is slow is solved, compare with conventional way, the utility model discloses an engineering cost can reduce more than 20%, and the time limit for a project shortens more than 40%, is worth promoting on a large scale.
Description
Technical Field
The utility model belongs to the technical field of tunnel engineering, especially, relate to a half open cut and half undercut's even encircle tunnel structure.
Background
For the multi-arch tunnel at the slope toe of the steep slope, due to serious bias, the top of one side of the tunnel is covered with thick soil, and the other side of the tunnel is covered with thin soil, and at the moment, the building of the multi-arch tunnel needs to backfill the side with the thin soil, and the multi-arch tunnel is constructed by adopting a three-pilot tunnel method after being subjected to compaction, grouting and other treatments, so that the construction cost is high and the construction speed is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a semi-open cut semi-underground excavated even encircles tunnel structure is provided, the problem that engineering cost is high, construction speed is slow that exists when the abrupt slope toe department builds even encircles the tunnel among the solution prior art.
The utility model is realized in such a way that the semi-open-cut and semi-underground-cut multi-arch tunnel structure is positioned at the slope toe of the steep slope and comprises an underground-cut tunnel and an open-cut tunnel; the underground excavated tunnel is positioned on one side with thick covering soil, the open excavated tunnel is positioned on one side with thin covering soil, and the underground excavated tunnel and the open excavated tunnel share a middle wall; one side of the underground tunnel, which is close to the open-cut tunnel, is provided with an opening which extends along the longitudinal direction of the underground tunnel; the top wall and the bottom wall of the opening are respectively and fixedly connected with the top and the bottom of the middle wall.
Furthermore, the cross section of the underground excavated tunnel is in a C shape.
Further, the underground tunnel comprises a primary support, a waterproof layer and a secondary lining which are arranged from outside to inside; the primary support comprises a system anchor rod, sprayed concrete and a profile steel arch, wherein the profile steel arch is respectively provided with a steel backing plate at the top wall and the bottom wall of the opening and is welded with the steel backing plate; the secondary lining adopts a reinforced concrete structure.
Furthermore, the open-cut tunnel adopts a reinforced concrete rectangular frame structure, the wall body of the open-cut tunnel close to the side of the underground tunnel is the middle wall, two first connecting surfaces and two second connecting surfaces which are respectively connected with the top wall and the bottom wall of the opening of the underground tunnel are reserved on the middle wall, the first connecting surfaces are perpendicular to the axis of the top wall of the opening of the underground tunnel, and the second connecting surfaces are perpendicular to the axis of the bottom wall of the opening of the underground tunnel; the width of the first connecting surface and the second connecting surface is the sum of the thickness of the primary support of the underground excavated tunnel and the thickness of the secondary lining of the underground excavated tunnel.
Further, the first connection face and the second of well wall are connected the face with the hookup location department of undercut tunnel opening part preliminary bracing all buries pre-buried steel sheet, pre-buried steel sheet is in with steel sheet anchor steel bar welding in the well wall, pre-buried steel sheet longitudinal separation with the longitudinal separation that undercut tunnel opening part preliminary bracing is the same, pre-buried steel sheet size slightly is greater than the steel backing plate size, pre-buried steel sheet and steel backing plate welding.
Furthermore, a reinforcing steel bar connector is embedded at the connecting position of the first connecting surface and the second connecting surface of the middle wall and the secondary lining at the opening of the underground excavated tunnel, the type of the reinforcing steel bar connector is matched with the type of a main reinforcing steel bar in the secondary lining at the opening of the underground excavated tunnel, the longitudinal distance of the reinforcing steel bar connector is the same as the longitudinal distance of the main reinforcing steel bar, one side of the reinforcing steel bar connector is connected with the main reinforcing steel bar, and the other side of the reinforcing steel bar connector is connected with the connector anchoring reinforcing steel bar embedded in the middle wall.
Furthermore, the first connecting surface and the second connecting surface of the middle wall are respectively provided with a water stop steel plate and a water swelling water stop strip at the connecting position of the secondary lining at the opening of the underground excavated tunnel.
Further, the water stop steel plate is a stainless steel plate or a galvanized steel plate.
Compared with the prior art, the utility model, beneficial effect lies in:
the utility model provides a semi-open-cut and semi-underground-cut multi-arch tunnel structure, wherein the underground-cut tunnel is positioned at one side with thick covering soil, and the open-cut tunnel is positioned at one side with thin covering soil; both share a middle wall. The problem of among the prior art when the steep slope toe department builds the multiple arch tunnel engineering cost high, construction speed is slow is solved, compare with conventional way, the utility model discloses an engineering cost can reduce more than 20%, and the time limit for a project shortens more than 40%, is worth promoting on a large scale.
Drawings
Fig. 1 is a schematic cross-sectional view of an open-cut and half-underground excavated multi-arch tunnel structure provided by an embodiment of the present invention;
FIG. 2 is a schematic diagram of arrangement of embedded parts at the connection surface of a middle wall and an underground tunnel of the multi-arch tunnel structure shown in FIG. 1;
fig. 3 is a schematic cross-sectional view of an open cut tunnel in construction according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 and 2, a preferred embodiment of the present invention is shown, which is a semi-open-cut and semi-underground multi-arch tunnel structure located at the slope toe of a steep slope, and comprises an underground tunnel 1 and an open-cut tunnel 2; the underground excavation tunnel 1 is located on one side with thick covering soil, the open excavation tunnel 2 is located on one side with thin covering soil, and the underground excavation tunnel 1 and the open excavation tunnel 2 share a middle wall 3.
The side of the underground tunnel 1 close to the open tunnel 2 is provided with an opening extending along the longitudinal direction of the underground tunnel 1, and the top wall 11 and the bottom wall 12 of the opening are fixedly connected with the top and the bottom of the middle wall 3 respectively. In this embodiment, the cross section of the undercut tunnel 1 is shaped like a "C".
The underground excavation tunnel 1 comprises a primary support, a waterproof layer 13 and a secondary lining which are arranged from outside to inside. The primary support comprises a system anchor rod, sprayed concrete and a section steel arch 14, wherein steel backing plates 15 are respectively arranged on the top wall 11 and the bottom wall 12 of an opening of the section steel arch 14, and the section steel arch 14 is welded with the steel backing plates 15; the secondary lining adopts a reinforced concrete structure.
The open cut tunnel 2 is of a reinforced concrete rectangular frame structure, the wall body of the open cut tunnel 1 side is a middle wall 3, and two first connecting surfaces 31 and two second connecting surfaces 32 which are respectively connected with the top wall 11 and the bottom wall 12 of the opening of the open cut tunnel 1 are reserved in the middle wall 3. The first connection face 31 is perpendicular to the axis of the open top wall 11 of the undercut tunnel 1 and the second connection face 32 is perpendicular to the axis of the open bottom wall 12 of the undercut tunnel 1. The width of the first connection surface 31 and the second connection surface 32 is the sum of the thickness of the primary support of the underground excavated tunnel 1 and the thickness of the secondary lining of the underground excavated tunnel 1.
The first connecting surface 31 and the second connecting surface 32 of the middle wall 3 are embedded with embedded steel plates 4 at the connecting positions of the primary supports at the opening of the underground tunnel 1, the embedded steel plates 4 are welded with steel plate anchoring steel bars 5 in the middle wall 3, the longitudinal distance between the embedded steel plates 4 is the same as that between the primary supports at the opening of the underground tunnel 1, the size of each embedded steel plate 4 is slightly larger than that of the steel backing plate 15, and the embedded steel plates 4 are welded with the steel backing plate 15.
The first connecting surface 31 and the second connecting surface 32 of the middle wall 3 are embedded with a reinforcing bar connector 6 at the connecting part of the secondary lining at the opening of the underground tunnel 1, and the type of the reinforcing bar connector 6 is matched with the type of the main reinforcing bar 16 in the secondary lining at the opening of the underground tunnel 1. The longitudinal distance of the reinforcing bar connector 6 is the same as the longitudinal distance of the main bar 16 at the opening of the underground tunnel 1, one side of the reinforcing bar connector 6 is connected with the main bar 16 at the opening of the underground tunnel 1, and the other side is connected with the connector anchoring bar 33 embedded in the middle wall 3.
Furthermore, the first connecting surface 31 and the second connecting surface 32 of the middle wall 3 are respectively provided with a water stop steel plate 7 and a water-swelling water stop strip 8 at the connecting position of the secondary lining at the opening of the underground tunnel 1. In this embodiment, the water-stop steel plate 7 is a stainless steel plate or a galvanized steel plate.
The embodiment also provides a construction method of the semi-open-cut and semi-underground-cut multi-arch tunnel structure, which comprises the following steps:
s1, please refer to fig. 3, excavating a temporary slope from top to bottom on the outer side of the open cut tunnel 2 to the bottom of the middle wall 3, and synchronously constructing a slope surface protection structure; preferably, the slope surface protection structure is formed by spraying a concrete protective surface b through a soil anchor rod a and a steel bar net;
s2, constructing an open cut tunnel 2, embedding a pre-buried steel plate 4, a steel bar connector 6 and a water stop steel plate 7 at the connecting surface of the open cut tunnel 2 and the middle wall 3;
s3, backfilling the soil covering c to the original ground elevation within the range of the open trench tunnel 2;
s4, constructing a forepoling structure of the underground excavation tunnel 1;
s5, excavating the underground tunnel 1;
s6, constructing the primary support of the underground tunnel 1, and welding the steel backing plates 15 of the steel arch 14 at the top wall 11 and the bottom wall 12 of the opening of the underground tunnel 1 with the embedded steel plates 4 at the corresponding positions of the middle wall 3;
s7, constructing a waterproof layer 13 of the underground excavation tunnel 1;
s8, chiseling concrete at the connecting surface of the middle wall 3 and the underground excavated tunnel 1, painting cement-based permeable crystalline waterproof paint 9 with the thickness not less than 0.8mm, and installing a water-swelling water stop strip 8 arranged at the connecting surface;
and S9, constructing a secondary lining of the underground tunnel 1, wherein the two main lining reinforcements 16 of the secondary lining are respectively connected with the reinforcement connectors 6 at the corresponding positions of the middle wall 3 at the positions of the top wall 31 and the bottom wall 32 of the opening.
In summary, in the semi-open-excavated semi-underground-excavated multi-arch tunnel structure provided by this embodiment, the underground excavated tunnel 1 is located on the thick side of the covering soil, and the open excavated tunnel 2 is located on the thin side of the covering soil; both share a middle wall 3. The method solves the problems of high construction cost and low construction speed in constructing the multi-arch tunnel at the steep slope toe in the prior art. Compared with the conventional method, the construction method of the embodiment has the advantages that the construction cost can be reduced by more than 20%, the construction period is shortened by more than 40%, and the method is worthy of being popularized in a large range.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A semi-open-cut and semi-underground-cut multi-arch tunnel structure is positioned at the slope toe of a steep slope and is characterized in that the multi-arch tunnel structure comprises an underground-cut tunnel and an open-cut tunnel; the underground excavated tunnel is positioned on one side with thick covering soil, the open excavated tunnel is positioned on one side with thin covering soil, and the underground excavated tunnel and the open excavated tunnel share a middle wall; one side of the underground tunnel, which is close to the open-cut tunnel, is provided with an opening which extends along the longitudinal direction of the underground tunnel; the top wall and the bottom wall of the opening are respectively and fixedly connected with the top and the bottom of the middle wall.
2. The semi-open and semi-underground excavated multi-arch tunnel structure of claim 1, wherein the cross-sectional shape of the underground excavated tunnel is "C" shaped.
3. The semi-open-cut and semi-underground-cut multi-arch tunnel structure according to claim 1 or 2, wherein the underground-cut tunnel comprises a preliminary support, a waterproof layer and a secondary lining arranged from outside to inside; the primary support comprises a system anchor rod, sprayed concrete and a profile steel arch, wherein the profile steel arch is respectively provided with a steel backing plate at the top wall and the bottom wall of the opening and is welded with the steel backing plate; the secondary lining adopts a reinforced concrete structure.
4. The structure of the semi-open and semi-underground excavated multi-arch tunnel according to claim 3, wherein the open-excavated tunnel is a reinforced concrete rectangular frame structure, the wall body near the side of the underground excavated tunnel is the middle wall, the middle wall is provided with a first connecting surface and a second connecting surface which are respectively connected with the top wall and the bottom wall of the opening of the underground excavated tunnel, the first connecting surface is perpendicular to the axis of the top wall of the opening of the underground excavated tunnel, and the second connecting surface is perpendicular to the axis of the bottom wall of the opening of the underground excavated tunnel; the width of the first connecting surface and the second connecting surface is the sum of the thickness of the primary support of the underground excavated tunnel and the thickness of the secondary lining of the underground excavated tunnel.
5. The semi-open and semi-underground excavated multi-arch tunnel structure according to claim 4, wherein the first and second connection surfaces of the middle wall are embedded with embedded steel plates at the connection positions with the preliminary supports at the opening of the underground excavated tunnel, the embedded steel plates are welded with the steel plate anchoring bars in the middle wall, the longitudinal distance between the embedded steel plates is the same as that between the preliminary supports at the opening of the underground excavated tunnel, the size of the embedded steel plates is slightly larger than that of the steel backing plates, and the embedded steel plates are welded with the steel backing plates.
6. The semi-open-cut and semi-underground-cut multi-arch tunnel structure of claim 5, wherein the first connecting surface and the second connecting surface of the middle wall are embedded with reinforcing bar connectors at the connecting parts with the secondary lining at the opening of the underground-cut tunnel, the type of the reinforcing bar connectors is matched with the type of the main bars in the secondary lining at the opening of the underground-cut tunnel, the longitudinal spacing of the reinforcing bar connectors is the same as the longitudinal spacing of the main bars, one side of each reinforcing bar connector is connected with the main bars, and the other side of each reinforcing bar connector is connected with the connector anchoring bars embedded in the middle wall.
7. The structure of claim 6, wherein the first and second connecting surfaces of the middle wall are provided with a water-stop steel plate and a water-swelling water-stop strip at the connecting position with the secondary lining, respectively.
8. The semi-open-cut and semi-underground-cut multi-arch tunnel structure of claim 7, wherein the water stop steel plate is a stainless steel plate or a galvanized steel plate.
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| CN111119908A (en) * | 2020-01-02 | 2020-05-08 | 深圳市综合交通设计研究院有限公司 | Semi-open-cut and semi-underground-cut multi-arch tunnel structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111119908A (en) * | 2020-01-02 | 2020-05-08 | 深圳市综合交通设计研究院有限公司 | Semi-open-cut and semi-underground-cut multi-arch tunnel structure and construction method thereof |
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Address after: Unit 1205, block C, building 1, Xinghe legend Garden Phase III, Longtang community, Minzhi street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen comprehensive transportation and municipal engineering design and Research Institute Co.,Ltd. Address before: 518000 No.9 Tianbei 4th Road, Luohu District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN TRANSPORTATION DESIGN & RESEARCH INSTITUTE Co.,Ltd. |