CN211081899U - Supporting structure for underground excavation tunnel in soft unconsolidated formation - Google Patents

Supporting structure for underground excavation tunnel in soft unconsolidated formation Download PDF

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Publication number
CN211081899U
CN211081899U CN201921843017.8U CN201921843017U CN211081899U CN 211081899 U CN211081899 U CN 211081899U CN 201921843017 U CN201921843017 U CN 201921843017U CN 211081899 U CN211081899 U CN 211081899U
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China
Prior art keywords
pile
tunnel
link
bow member
frame
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CN201921843017.8U
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Chinese (zh)
Inventor
邹光炯
张�荣
曾令宏
彭辉
梅乐胜
马强
周捷
方胜
易谊
潘微君
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Chongqing Rail Transit Design And Research Institute Co ltd
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Chongqing Rail Transit Design And Research Institute Co ltd
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Abstract

The utility model provides a weak unconsolidated formation undercut tunnel supporting construction, including the first bow member of tunnel upper portion of supporting, and prevent the tunnel subside and the vertical pile that the bottom sinks, the vertical pile sets up under the first bow member, there are a plurality of first bow members, set up two vertical piles at least below each first bow member; supporting construction still includes the link, and the link includes first link and second link, and first link is connected between erector pile and first bow member, the second link is connected between two adjacent erector piles, first bow member, erector pile and link form the integrative closed ring of pile frame jointly in same tunnel cross-section. According to the scheme, the pile foundation is timely constructed in the primary support in the underground excavation tunnel, the pile foundation and the traditional first arch frame are connected through the connecting frame to form the pile frame integrated closed ring structure, the difficult problems that the bearing capacity of the foundation of the underground excavation tunnel structure of the weak loose stratum is insufficient, the settlement deformation is large are solved, and the tunnel surrounding rock deformation control and the surrounding environment protection are enhanced.

Description

Supporting structure for underground excavation tunnel in soft unconsolidated formation
Technical Field
The utility model relates to an underground works construction field, concretely relates to loose stratum undercut tunnel supporting construction of weak.
Background
When the tunnel passes through the weak loose stratum inevitably at the line, the traditional underground tunnel supporting structure cannot ensure the construction safety when the underground tunnel passes through the weak loose stratum and cannot solve the problems of insufficient bearing capacity of the tunnel structure foundation and large sedimentation deformation based on the loose structure and the non-uniform physical and mechanical properties of the weak loose stratum.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides a pair of soft unconsolidated formation undercut tunnel supporting construction has both solved traditional undercut tunnel supporting construction and can't guarantee that the undercut tunnel passes through the difficult problem of the construction safety of soft unconsolidated formation, has also solved soft unconsolidated formation undercut tunnel structure ground bearing capacity not enough, has subsided the great difficult problem of deformation.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
a supporting structure of a soft unconsolidated formation underground excavation tunnel comprises a first arch center for supporting the upper part of the tunnel and vertical piles for preventing the tunnel from settling and the bottom from collapsing, wherein the vertical piles are arranged right below the first arch center, the number of the first arch centers is multiple, and at least two vertical piles are arranged below each first arch center; the supporting structure further comprises a connecting frame, the connecting frame comprises a first connecting frame and a second connecting frame, the first connecting frame is connected between the vertical piles and the first arch frame, the second connecting frame is connected between the adjacent two vertical piles, and the first arch frame, the vertical piles and the connecting frame form an integrated pile frame closed ring in the same tunnel section.
Optionally, still include the second bow member, the second bow member has a plurality ofly and sets up along the tunnel tunnelling direction interval, just the second bow member is located between two adjacent first bow members, and the interval that sets up between two adjacent second bow members and between adjacent second bow member and the first bow member is 0.5~1 meter.
Optionally, the integrative closed loop of pile frame has a plurality ofly, and is a plurality of integrative closed loop of pile frame sets up along the direction interval of tunneling, and is a plurality of the setting interval of the integrative closed loop of pile frame is 2~5 meters.
Optionally, at least two opposite first connecting plates are arranged on the outer wall of the vertical pile, second connecting plates are arranged at two ends of each connecting frame, and the first connecting plates are connected with the adjacent second connecting plates.
Optionally, a first connecting portion is arranged on the first connecting plate, a second connecting portion is arranged on the second connecting plate, and when the connecting frame is connected with the vertical piles, the first connecting portion and the second connecting portion are connected through a bolt.
Optionally, the first connecting plate is slidably disposed on the outer wall of the vertical pile to ensure the connection precision of the first connecting part and the second connecting part.
Optionally, a third connecting plate is arranged at the bottom end of the first arch frame, facing one side of the connecting frame, and the third connecting plate has the same structure as the first connecting plate.
According to the above technical scheme, the beneficial effects of the utility model are that:
the utility model provides a weak unconsolidated formation undercut tunnel supporting construction, including the first bow member of tunnel upper portion of supporting, and prevent the tunnel subside and the vertical pile that the bottom sinks, the vertical pile sets up under the first bow member, there are a plurality of first bow members, and each the below of first bow member sets up two at least the vertical piles; the supporting structure further comprises a connecting frame, the connecting frame comprises a first connecting frame and a second connecting frame, the first connecting frame is connected between the vertical piles and the first arch frame, the second connecting frame is connected between the adjacent two vertical piles, and the first arch frame, the vertical piles and the connecting frame form an integrated pile frame closed ring in the same tunnel section. According to the scheme, the pile foundation is arranged in the underground excavated tunnel, the pile foundation and the traditional first arch frame are connected through the connecting frame to form the pile frame integrated closed ring structure, the construction safety of the underground excavated tunnel penetrating through the soft loose stratum is effectively guaranteed, the pile foundation is timely constructed through primary support, the difficult problems of insufficient bearing capacity of the tunnel structure foundation and large sedimentation deformation are solved, and the tunnel surrounding rock deformation control and the surrounding environment protection are enhanced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic perspective view of a supporting structure of a soft unconsolidated formation underground excavation tunnel;
FIG. 2 is a schematic structural view of an integral closed ring of the pile frame;
FIG. 3 is a schematic structural view of another embodiment of an integrated closed ring of the pile frame;
FIG. 4 is a schematic view of the pile frame integrated closed ring arranged at intervals;
FIG. 5 is a schematic view of the connection frame with the vertical piles;
FIG. 6 is a schematic view of another embodiment of the pile frame integrated closed ring spacing arrangement;
reference numerals:
1-a first arch frame, 2-vertical piles, 3-connecting frames, 4-tunnels, 5-longitudinal beams and 6-reinforced piles;
21-first connecting plate, 22-first connecting part, 23-reinforcing steel bar, 31-first connecting frame, 32-second connecting frame, 33-second connecting plate and 34-second connecting part.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
In the description of the present application, it is to be understood that the terms "below," "bottom end," and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 by those of ordinary skill in the art through specific situations.
Referring to fig. 1-4, the utility model provides a weak unconsolidated formation undercut tunnel supporting structure, including the first bow member 1 of supporting tunnel upper portion to and prevent that the tunnel subsides and the vertical pile 2 that the bottom sinks, the vertical pile 2 sets up under first bow member 1, there are a plurality of first bow members 1, and set up two said vertical piles 2 at least below each said first bow member 1; supporting construction still includes link 3, link 3 includes first link 31 and second link 32, first link 31 is connected between erector pile 2 and first bow member 1, second link 32 is connected in adjacent two between the erector pile 2, first bow member 1 erector pile 2 and link 3 forms the integrative closed ring of pile frame jointly in same tunnel cross-section to subsequent pouring forms forever solid support system. Specifically, the connecting frame 3 may be a steel bar frame or a steel section. Preferably, the first connecting frame 31 and the second connecting frame 32 form an inverted arch structure together at the bottom of the tunnel. In one embodiment, the first connecting frame 31 and the second connecting frame 32 are prefabricated into an arc-shaped structure, and the height of each vertical pile 2 exceeding the bottom surface of the tunnel needs to be adaptively adjusted, so that the first connecting frame 31 and the second connecting frame 32 jointly form an inverted arch structure at the bottom of the tunnel, and the structural stability of the integrated closed ring of the pile frame is improved, please refer to fig. 3 specifically. Specifically, the tunnel excavation device further comprises a plurality of second arches which are arranged at intervals along the tunnel excavation direction, the second arches are arranged between two adjacent first arches 1, the arrangement intervals between the two adjacent second arches and between the adjacent second arches and the first arches 1 are 0.5-1 meter, the first arches and the second arches are the same in structure, and the arches are arranged densely relatively to provide enough supporting force for the special geological condition of the weak and loose stratum. Specifically, the integrative closed loop of pile frame has a plurality ofly, and is a plurality of integrative closed loop of pile frame sets up along the direction interval of tunneling, and is a plurality of the setting interval of the integrative closed loop of pile frame is 2~5 meters. Obviously, it is neither necessary nor difficult to construct each arch by piling underneath it to form a pile-frame-integrated closed-loop supporting structure, so it is only necessary to construct a pile-frame-integrated closed-loop supporting structure for the first arch 1. Through set up the pile foundation in the undercut tunnel, the pile foundation specifically sets up on the basement rock to connect pile foundation and traditional bow member through link 3 and form the integrative closed loop structure of pile frame, construct the pile foundation in time through strutting in the preliminary stage, solved tunnel structure foundation bearing capacity not enough and subside the great difficult problem of deformation, strengthened tunnel country rock deformation control and all ring edge enviroment protection.
The construction method comprises the following steps: firstly, excavating a weak loose stratum by adopting a subsurface tunnel construction method, immediately constructing a first arch support at the initial stage after the tunnel excavation is finished, strictly controlling excavation footage, wherein the excavation footage is not more than one time of the interval of the first arch, and immediately constructing the first arch support after each excavation; secondly, drilling at the bottom of the tunnel until the hole reaches bedrock, splicing reinforcement cages required by a pile foundation section by section according to the hole forming depth, and placing the reinforcement cages in the finished holes, wherein the last section of reinforcement cage needs to exceed the bottom surface of the tunnel; thirdly, connecting the first arch centering with the reinforcement cage by using a connecting frame to form an integrated pile frame closed ring; then, the first arch frame, the reinforcement cage and the connecting frame are poured into a whole to form the pile frame integrated stable support; and finally, after one pile frame integrated closed ring is stably supported, next excavation is carried out according to the previous steps, and circular tunneling is carried out. In one embodiment, when the first arch 1, the reinforcement cage and the connecting frame 3 which are positioned at least on the bottom surface part of the tunnel are formed in a one-step pouring mode, and concrete can be independently sprayed on the arch on the upper part of the tunnel to complete the pouring. In another embodiment, the steel bars can be reserved outside the steel bar cage, the steel bar cage is cast into a pile independently, then the pile is connected with the connecting frame 3 through the reserved steel bars, and finally the connecting frame 3 and the first arch frame 1 are cast to form a whole. In particular, the method adopts the steel bar pouring to form the pile, obviously, the steel pipe pouring can also be adopted to form the pile.
As a further improvement to the above scheme, please refer to fig. 5, at least two opposite first connecting plates 21 are arranged on the outer wall of the vertical pile 2, second connecting plates 33 are arranged at both ends of the connecting frame 3, and the first connecting plates 21 are connected with the adjacent second connecting plates 33, specifically, in a threaded connection. Preferably, the first connecting plate 21 is provided with a first connecting portion 22, the second connecting plate 33 is provided with a second connecting portion 34, and when the connecting frame 3 is connected with the vertical pile 2, the first connecting portion 22 and the second connecting portion 34 are fastened and connected through a bolt. In one embodiment, the first connecting portion 22 is a double-lug structure, the second connecting portion 34 is a single-lug structure, and the bolts are vertically arranged, so that the operation is convenient, and the reliability of the structure is improved by utilizing the characteristics of good pressure bearing performance and poor bending and shearing resistance of the bolts. First connecting plate 21 sets up with sliding on 2 outer walls of vertical pile to guarantee first connecting portion 22 and the connection precision of second connecting portion 34, because steel reinforcement cage sets up the back and fixes promptly, in the engineering reality, the joint department has the error so that link 3 and steel reinforcement cage are difficult to counterpoint, and at this moment, the first connecting plate 21 of accessible slides from top to bottom in order to eliminate the error, treats link 3 and steel reinforcement cage connected back, slides from top to bottom through technical structure restriction such as fastening screw first connecting plate 21. Vertical pile 2 includes many reinforcing bars 23, many reinforcing bar 23 sets up in order to form circular steel reinforcement cage structure along 2 depth direction of vertical pile, adjacent two is established to the both sides cover of first connecting plate 21 on the reinforcing bar 23. Preferably, the reinforcing steel bars 23 can extend outwards of the pile or be anchored into the tunnel secondary lining after being lengthened so as to connect the tunnel secondary lining and the pile frame into a whole through an integral closed ring. The bottom end of the first arch centering 1 faces towards one side of the connecting frame 3, a third connecting plate is arranged on one side of the connecting frame, and the third connecting plate is identical to the first connecting plate 21 in structure, so that the manufacturing and installation are facilitated. This scheme adopts bolted connection, and the non-welded reason is that the welding receives multiple environmental factor to influence, is not enough to voltage instability like building site electric capacity, and humidity even ponding etc. all influence welding quality in the tunnel.
As a further improvement to the above scheme, please refer to fig. 6, the underground excavation tunnel supporting structure further includes longitudinal beams 5, the longitudinal beams 5 are disposed at two sides of the tunneling direction of the tunnel, and the longitudinal beams 5 are connected with the arch springs of the first arch frame and the second arch frame to increase the overall stability. Specifically, the longitudinal beams are poured section by section and connected into a whole along with the tunneling construction of the tunnel. Particularly, a plurality of reinforcing piles 6 are arranged between the two adjacent pile frame integrated closed rings, and the reinforcing piles 6 are integrally poured with the connecting frame through reinforcing steel bars, so that the structural stability is further improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims (7)

1. The utility model provides a weak unconsolidated formation undercut tunnel supporting construction, is including supporting first bow member (1) on tunnel upper portion to and prevent that the tunnel subsides and the vertical pile (2) that the bottom collapsed, its characterized in that: the vertical piles (2) are arranged right below the first arch centering (1), the number of the first arch centering (1) is multiple, and at least two vertical piles (2) are arranged below each first arch centering (1); supporting construction still includes link (3), link (3) include first link (31) and second link (32), first link (31) are connected between erector pile (2) and first bow member (1), second link (32) are connected in adjacent two between erector pile (2), first bow member (1) erector pile (2) and link (3) form the integrative closed ring of pile frame jointly in same tunnel cross-section.
2. The weak unconsolidated formation undercut tunnel support structure of claim 1, wherein: still include the second bow member, the second bow member has a plurality ofly and sets up along tunnel tunnelling direction interval, just the second bow member is located between two adjacent first bow members (1), and the interval that sets up between two adjacent second bow members and between adjacent second bow member and first bow member (1) is 0.5~1 meter.
3. The weak unconsolidated formation undercut tunnel support structure of claim 1, wherein: the pile frame integrated closed ring is multiple and arranged at intervals along the tunneling direction of the tunnel, and the pile frame integrated closed ring is multiple and arranged at intervals of 2-5 meters.
4. The weak unconsolidated formation undercut tunnel support structure of any one of claims 1 to 3, wherein: the outer wall of the vertical pile (2) is at least provided with two opposite first connecting plates (21), the two ends of the connecting frame (3) are respectively provided with a second connecting plate (33), and the first connecting plates (21) are connected with the adjacent second connecting plates (33).
5. The weak unconsolidated formation undercut tunnel support structure of claim 4, wherein: be equipped with first connecting portion (22) on first connecting plate (21), be equipped with second connecting portion (34) on second connecting plate (33), work as link (3) are connected with erect stake (2), first connecting portion (22) pass through a bolt-up with second connecting portion (34) and are connected.
6. The weak unconsolidated formation undercut tunnel support structure of claim 5, wherein: the first connecting plate (21) is arranged on the outer wall of the vertical pile (2) in a sliding mode so as to ensure the connection precision of the first connecting part (22) and the second connecting part (34).
7. The weak unconsolidated formation undercut tunnel support structure of claim 4, wherein: the bottom end of the first arch centering (1) faces one side of the connecting frame (3) and is provided with a third connecting plate, and the third connecting plate is identical to the first connecting plate (21) in structure.
CN201921843017.8U 2019-10-30 2019-10-30 Supporting structure for underground excavation tunnel in soft unconsolidated formation Active CN211081899U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921843017.8U CN211081899U (en) 2019-10-30 2019-10-30 Supporting structure for underground excavation tunnel in soft unconsolidated formation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921843017.8U CN211081899U (en) 2019-10-30 2019-10-30 Supporting structure for underground excavation tunnel in soft unconsolidated formation

Publications (1)

Publication Number Publication Date
CN211081899U true CN211081899U (en) 2020-07-24

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