CN217206466U - Curved middle wall anti-deflection structure of multi-arch tunnel under terrain bias pressure - Google Patents

Abstract

The utility model discloses a curved well wall deflection prevention structure in ground shape deflection pressure double-arch tunnel, include: the wall top hollow anchor rod is used for enhancing the connection stability between the curved middle wall and the top surrounding rock, the bottom reinforcing pipe group is used for enhancing the connection stability between the curved middle wall and the bottom surrounding rock, and the primary support locking anchor rod is used for enabling the curved middle wall to be changed from a concentrated bias stress state to a distributed bias stress state. One end of the hollow anchor rod at the top of the wall is connected into the curved middle wall, and the other end opposite to the hollow anchor rod is upwards driven into the surrounding rock at the top. One end of the bottom reinforcing pipe group is connected into the curved middle wall, and the other opposite end of the bottom reinforcing pipe group is driven downwards into the bottom surrounding rock. The primary support locking anchor rod is respectively driven into the external surrounding rock by the left hole and the right hole. The utility model discloses the structure is applicable to complicated bias voltage geological conditions, has that application scope is wide, the structure overall stability is good, anti deflection performance is strong characteristics to improve the bearing performance and the stability of wall in the song.

Description

Anti-deflection structure for curved middle wall of multi-arch tunnel under terrain bias voltage

Technical Field

The utility model relates to a tunnel construction technical field even encircles, especially, relate to a crooked center wall of even arch tunnel prevents deflection structure under ground shape bias voltage.

Background

In the process of traffic engineering construction, a large amount of terrain bias large-span tunnel engineering is involved, and the adoption of a multi-arch tunnel method is one of the most common methods. The combined type curved middle wall of the multi-arch tunnel has important significance for ensuring tunnel surrounding rock and structural stability. The curved middle wall of weak broken country rock multi-arch tunnel has the main problems under the topography bias voltage condition: uneven stress on the curved middle wall caused by tunnel excavation under terrain bias pressure induces wall deflection and fracturing, and even destabilization damage to tunnel surrounding rocks or structures. How to solve the problem that how to deflect and enhance the deflection resistance of a curved middle wall of a weak broken surrounding rock multi-arch tunnel under the condition of terrain bias is an urgent need to be solved in engineering.

SUMMERY OF THE UTILITY MODEL

The utility model provides a continuous tunnel under topographic bias pressure curves well wall and prevents deflection structure to tunnel excavation easily exists under solving current topographic bias pressure and curves well wall and induce wall body deflection, fracturing, tunnel country rock or the technical problem that structural instability destroyed even because of inhomogeneous atress.

The utility model adopts the technical scheme as follows:

a curved middle wall deflection-preventing structure of a multi-arch tunnel under terrain deflection comprises: the device comprises a curved middle wall connected between a left hole and a right hole, a wall top hollow anchor rod used for enhancing the connection stability between the curved middle wall and top surrounding rocks, a bottom reinforcing pipe group used for enhancing the connection stability between the curved middle wall and bottom surrounding rocks, and a primary support locking anchor rod used for converting the curved middle wall from a concentrated bias stress state to a distributed bias stress state; one end of a hollow anchor rod at the top of the wall is connected into the curved middle wall, and the other opposite end of the hollow anchor rod is upwards driven into top surrounding rock; one end of the bottom reinforcing pipe group is connected into the curved middle wall, and the other end of the bottom reinforcing pipe group is downwards driven into the bottom surrounding rock; the primary support locking anchor rod is respectively driven into the external surrounding rock by the left hole and the right hole.

Furthermore, the structural reinforcing steel bars of the curved middle wall comprise circumferential reinforcing steel bars for constructing an appearance framework of the curved middle wall, the appearance framework comprises two side wall frames positioned at two sides, and a top surface frame and a bottom surface frame which are oppositely arranged up and down and are respectively connected with the two side wall frames; the structural reinforcement of the curved middle wall also comprises longitudinal reinforcements which are sequentially arranged at intervals along the outer peripheral line of the outline framework and extend along the longitudinal direction, and transverse stirrups which are connected between the two side ledges.

Furthermore, the structural reinforcement of the curved middle wall also comprises a reinforcing stirrup for reinforcing the integral strength of the structure; the reinforced stirrups are connected between the top surface frame and the two side wall frames, and between the bottom surface frame and the two side wall frames.

Furthermore, the number of the wall top hollow anchor rods is multiple, and the multiple wall top hollow anchor rods are arranged in a radial shape at intervals.

Further, the wall top hollow anchor rod comprises a hollow anchor rod body, a plastic expansion shell connected to the driving end of the hollow anchor rod body, an anchoring piece connected to the grouting end of the hollow anchor rod body, an exhaust pipe used for exhausting during grouting, and a first grouting body used for enabling the wall top hollow anchor rod and top surrounding rock to be connected into a whole; the wall surface of the hollow anchor rod body is provided with a grouting hole penetrating through the wall surface, the grouting end of the hollow anchor rod body is connected with a structural reinforcement at the top of the curved middle wall through an anchoring part, the opposite driving end is driven upwards into top surrounding rock, and the pulling resistance is enhanced through expansion after the plastic expansion shell is stressed; one end of the exhaust pipe is positioned between the hollow anchor rod body and the anchor rod hole, and the other end of the exhaust pipe opposite to the hollow anchor rod body extends out of the anchor rod hole; the first grouting body is filled in the hollow anchor rod body, the grouting hole and the anchor rod hole and permeates into the surrounding rock at the top.

Further, the bottom reinforcing pipe group comprises a guide pipe grouting rod for reinforcing the bottom foundation of the curved middle wall and a grouting steel pipe pile for enhancing the connection strength between the curved middle wall and the bottom surrounding rock; the number of the guide pipe grouting rods is multiple, the guide pipe grouting rods are arranged in a radial shape at intervals, the upper end of each guide pipe grouting rod is positioned in a bottom plate of the curved middle wall, and the opposite lower end of each guide pipe grouting rod is driven downwards into a bottom foundation; the quantity of slip casting steel-pipe pile is many, and many slip casting steel-pipe piles are radial interval setting, and the upper end of each slip casting steel-pipe pile is connected in the wall in the song, and during its relative lower extreme was hit into bottom country rock downwards.

Furthermore, the conduit grouting rod comprises a hollow grouting rod body and a second grouting body for connecting the conduit grouting rod and the bottom foundation into a whole; the wall surface of the grouting rod body is provided with a slurry leakage hole penetrating through the wall surface, the driving end of the grouting rod body extends into a conical head, and the opposite grouting end of the grouting rod body is provided with an opening for injecting slurry into the grouting rod body; and the second grouting body is filled in the grouting rod body and the slurry leakage hole and permeates into the foundation at the bottom.

Further, the grouting steel pipe pile comprises a hollow steel pipe body, a reinforcement cage for enhancing the structural strength and rigidity of the grouting steel pipe pile, and a third grouting body for connecting the grouting steel pipe pile and the surrounding rock at the bottom into a whole; the wall surface of the steel pipe body is provided with a slurry outlet hole penetrating through the wall surface, the driving end of the steel pipe body extends into a conical head, and the opposite grouting end of the steel pipe body is provided with an opening for grouting into the steel pipe body; the steel reinforcement cage extends along the length direction of the steel pipe body and is arranged in the steel pipe body.

Furthermore, the number of the primary support locking anchor rods is multiple, and the multiple primary support locking anchor rods are arranged in a radial shape at intervals; the grouting end of each primary support locking anchor rod is welded and fixed with the primary lining steel arch centering of the left hole or the right hole, and the opposite driving end is driven into the external surrounding rock by the side wall and the vault of the left hole or the right hole.

Further, the structure of the primary support locking anchor rod is the same as that of the hollow anchor rod on the wall top.

The utility model discloses following beneficial effect has:

the utility model discloses a curved middle wall anti-deflection structure of multi-arch tunnel under terrain bias voltage, including curved middle wall, left hole, right hole, wall top cavity stock, bottom reinforced pipe group and primary locking stock, it is applicable to complicated bias voltage geological conditions, have wide application scope, the structural integrity stability is good, the characteristic of anti-deflection performance is strong; in the structure of the utility model, the primary locking anchor rod is synchronously constructed in the construction process of the left hole and the right hole, so that the constructed primary locking anchor rod is respectively driven into the external surrounding rock by the left hole and the right hole, and the curved middle wall is changed from a concentrated bias stress state into a distributed bias stress state so as to limit the relative sliding between the primary lining of the left hole and the right hole and the surrounding rock and realize the coordinated deformation of the lining structure and the surrounding rock; the utility model discloses in the structure, set up wall crown cavity stock between the top of wall and the top country rock in the song to set up the bottom reinforcement nest of tubes and strengthen the reinforcement processing simultaneously between the bottom of wall and the bottom country rock in the song, fully guarantee in the song wall and surrounding rock around form wholly, thereby realize reinforcing in the song wall bear bias voltage load and anti deflection ability, improve the bearing performance and the stability of wall in the song.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

fig. 1 is a schematic view of the structure of preventing deflection of curved middle wall of multi-arch tunnel under terrain bias according to the preferred embodiment of the invention;

FIG. 2 is a schematic illustration of reinforcement of the curved middle wall structure of FIG. 1;

FIG. 3 is a schematic view of the hollow anchor in the wall top of FIG. 1 in an operative condition;

FIG. 4 is a schematic view of the structure of the grouting rod of the guide pipe in FIG. 1;

FIG. 5 is a schematic view of the arrangement of the grouting rods of the catheter in FIG. 4;

FIG. 6 is a schematic structural view of the steel pipe pile of FIG. 1;

fig. 7 is a left side view of the structure of fig. 6.

Description of the figures

10. A left hole; 20. a right hole; 30. a curved middle wall; 301. circumferential reinforcing steel bars; 302. longitudinal reinforcing steel bars; 303. a transverse stirrup; 304. reinforcing the stirrup; 40. top surrounding rock; 50. hollow anchor rods on the wall top; 501. grouting holes; 51. a hollow anchor rod body; 52. plastic expansion shell; 53. an anchoring member; 54. an exhaust pipe; 55. a first slip casting; 60. bottom wall rock; 70. a duct grouting rod; 701. a slurry leaking hole; 702. reserving a pulp stopping section; 71. grouting the rod body; 72. a second slip casting; 80. grouting the steel pipe pile; 801. a slurry outlet; 81. a steel pipe body; 82. a reinforcement cage; 83. a third slip casting body; 90. primary support locking anchor rods; 110. an outer surrounding rock.

Detailed Description

The embodiments of the invention will be described in detail hereinafter with reference to the drawings, but the invention can be implemented in many different ways, which will be defined and covered hereinafter.

Referring to fig. 1, a preferred embodiment of the present invention provides a curved middle wall anti-deflection structure of an arch-connected tunnel under a terrain bias, including: the curved middle wall 30 is connected between the left hole 10 and the right hole 20, the wall top hollow anchor rod 50 for enhancing the connection stability between the curved middle wall 30 and the top surrounding rock 40, the bottom reinforcing pipe group for enhancing the connection stability between the curved middle wall 30 and the bottom surrounding rock 60, and the primary support locking anchor rod 90 for converting the curved middle wall 30 from a concentrated bias stress state to a distributed bias stress state. One end of the wall top hollow anchor 50 is connected to the curved middle wall 30 and the opposite end is driven upward into the top surrounding rock 40. One end of the bottom reinforced pipe section is connected to the curved middle wall 30 and the opposite end is driven down into the bottom wall rock 60. The primary support locking anchor rod 90 is driven into the outer surrounding rock 110 from the left hole 10 and the right hole 20 respectively.

The utility model discloses a mechanical mechanism of crooked well wall anti-deflection structure in multi-arch tunnel under topography bias voltage does: the primary support locking anchor rods 90 are synchronously constructed in the construction process of the left hole 10 and the right hole 20, so that the constructed primary support locking anchor rods 90 are respectively driven into the external surrounding rocks 110 from the left hole 10 and the right hole 20, the connection stability of the left hole 10 and the right hole 20 and the external surrounding rocks 110 is enhanced, the curved middle wall 30 is changed from a previous concentrated bias stress state into a distributed bias stress state, the relative sliding between the primary lining of the left hole 10 and the right hole 20 and the external surrounding rocks is effectively limited, and the coordinated deformation of a lining structure and the external surrounding rocks is realized; meanwhile, the wall top hollow anchor rods 50 are arranged between the top of the curved middle wall 30 and the top surrounding rock 40 above the curved middle wall, and the bottom reinforcing pipe groups are arranged between the bottom of the curved middle wall 30 and the bottom surrounding rock 60 below the curved middle wall, so that the curved middle wall 30 and the surrounding rocks around the curved middle wall are fully ensured to form a whole, the biasing load bearing capacity and the deflection resisting capacity of the curved middle wall 30 are enhanced, and the bearing performance and the stability of the curved middle wall 30 are improved.

The utility model discloses a curved middle wall anti-deflection structure of multi-arch tunnel under terrain bias voltage, including curved middle wall 30, left hole 10, right hole 20, wall crown cavity stock 50, bottom reinforced pipe group and first support locking stock 90, it is applicable to complicated bias voltage geological conditions, have wide application scope, the overall stability of structure is good, the characteristic that anti-deflection performance is strong; in the structure of the utility model, the primary locking anchor rod 90 is synchronously constructed in the construction process of the left hole 10 and the right hole 20, so that the constructed primary locking anchor rod 90 is respectively driven into the external surrounding rock 110 by the left hole 10 and the right hole 20, and the curved middle wall 30 is changed from a concentrated bias stress state to a distributed bias stress state, so as to limit the relative sliding between the primary lining of the left hole 10 and the right hole 20 and the surrounding rock and realize the coordinated deformation of the lining structure and the surrounding rock; the utility model discloses in the structure, set up wall crown cavity stock 50 between the top of wall 30 and the top country rock 40 in the song to set up the bottom simultaneously and consolidate the nest of tubes and strengthen the reinforcement processing between the bottom of wall 30 in the song and bottom country rock 60, fully guarantee in the song wall 30 and around the country rock form wholly, thereby realize that the reinforcing is bent bearing bias voltage load and the anti deflection ability of wall 30, improve the bearing capacity and the stability of wall 30 in the song.

Alternatively, as shown in fig. 1 and 2, the structural reinforcement of the curved middle wall 30 includes a circumferential reinforcement 301 for constructing an outer frame of the curved middle wall 30, the outer frame includes two side wall frames at both sides, and a top frame and a bottom frame disposed opposite to each other in an up-down direction and connected to the two side wall frames, respectively. The structural reinforcement of the curved middle wall 30 further includes longitudinal reinforcements 302 arranged at intervals in sequence along the outer circumference of the outer frame and extending in the longitudinal direction, and transverse stirrups 303 connected between the two side ledges. The curved middle wall 30 has a simple structure and is easy to manufacture.

Further, as shown in fig. 2, the structural reinforcement of the curved middle wall 30 further includes a reinforcement stirrup 304 for reinforcing the overall strength of the structure. The reinforcement stirrup 304 is connected between the top frame and the two side ledges, and between the bottom frame and the two side frames. In this alternative, the wall shoulder and the wall foot of the curved middle wall 30 are respectively provided with an oblique reinforced stirrup 304, so as to enhance the compression resistance and torsion resistance of the curved middle wall 30. In this alternative, the types and sizes of the circumferential rebars 301, the longitudinal rebars 302, the transverse stirrups 303, and the reinforcement stirrups 304 may be as shown in fig. 2, or may be determined specifically according to actual engineering.

Optionally, as shown in fig. 1, the number of the wall top hollow anchor rods 50 is multiple, and the multiple wall top hollow anchor rods 50 are radially arranged at intervals, so that the wall top hollow anchor rods 50 and the curved middle wall 30 can be uniformly stressed, and the stress state of the wall top hollow anchor rods 50 and the curved middle wall 30 is improved.

In this alternative, as shown in fig. 1 and 3, the hollow anchor rod 50 of the top of the wall comprises a hollow anchor rod body 51, a plastic shell 52 connected to the driving end of the hollow anchor rod body 51, an anchor member 53 connected to the grouting end of the hollow anchor rod body 51, an exhaust pipe 54 for exhausting gas during grouting, and a first grouting body 55 for integrally connecting the hollow anchor rod 50 of the top of the wall with the surrounding rock 40 of the top. The wall surface of the hollow anchor rod body 51 is provided with a grouting hole 501 penetrating through the wall surface, the grouting end of the hollow anchor rod body 51 is connected with a structural reinforcement at the top of the curved middle wall 30 through an anchoring part 53, the opposite driving end is upwards driven into the top surrounding rock 40, and the pulling resistance is enhanced through the expansion of the plastic expansion shell 52 after being stressed. One end of the exhaust tube 54 is located between the hollow anchor rod body 51 and the anchor rod bore, and the opposite end extends out of the anchor rod bore. The first grout 55 is filled in the hollow bolt body 51, the grout holes 501, and the bolt holes, and penetrates into the top surrounding rock 40.

In the above scheme, the hollow anchor rod body 51 plays a role of a lacing wire; the pulling resistance can be enhanced after the plastic expansion shell 52 is expanded in tension; the first grouting body 55 tightly connects the wall top hollow anchor rod 50 with the top surrounding rock 40, and the friction effect of the wall top hollow anchor rod 50 is increased to play a self-supporting role of the surrounding rock; the anchoring part 53 comprises a steel base plate and a fixing nut which are sequentially arranged on the excircle of the grouting end of the hollow anchor rod body 51, and the steel base plate and the fixing nut are matched to play an anchoring role; the plastic exhaust pipe 54 plays a role in exhausting gas in grouting the hollow anchor rod 50 at the top of the wall, and facilitates pressing in of cement grout. The top surrounding rock 40 of the curved middle wall 30 is drilled with the hollow anchor rod 50 embedded in the top, cement grout is injected into the hollow anchor rod 50 of the top to be in full contact with the top surrounding rock 40 to enhance the friction effect, the end plastic expansion shell 52 can increase the pulling resistance after being tensioned and expanded, the tail part of the hollow anchor rod 50 of the top is anchored with the structural reinforcement of the curved middle wall 30 through a steel backing plate and a fixing nut, the top surrounding rock 40 and the curved middle wall 30 are connected into a whole by the hollow anchor rod 50 of the top, and the integrity and the stability of the hollow anchor rod are improved. Specifically, the diameter of the hollow anchor rod 50 at the top of the wall is about 25mm, and the length of the hollow anchor rod penetrating into the surrounding rock is not less than 2.5 m; performing anchor rod hole construction by adopting a cross or button drill, wherein the aperture is about 42mm, the length is 4.5m, and the cross or button drill is arranged at intervals of 800mm multiplied by 800mm in the circumferential direction multiplied by the longitudinal direction; the grouting is performed by adopting a special grouting pump for a DML30-2 type anchor rod, and the grouting pressure is about 0.5-1.0 MPa; the cement grout body adopts pure cement paste, and the water cement ratio (WC) is 0.45-0.30: 1, when grouting upwards, adopting a unidirectional grouting type stop plug to feed the grout or a direct grout feeding pipe to perform grouting.

Alternatively, as shown in fig. 1, the bottom reinforcing pipe group includes a pipe grouting rod 70 for reinforcing the bottom foundation of the curved middle wall 30, and a grouting steel pipe pile 80 for reinforcing the coupling strength between the curved middle wall 30 and the bottom surrounding rock 60. The number of the guide pipe grouting rods 70 is plural, the plurality of guide pipe grouting rods 70 are arranged in a radial shape at intervals, the upper end of each guide pipe grouting rod 70 is positioned in the bottom plate of the curved middle wall 30, and the opposite lower end is driven downwards into the bottom foundation. The number of the grouting steel pipe piles 80 is plural, the grouting steel pipe piles 80 are radially arranged at intervals, the upper end of each grouting steel pipe pile 80 is connected into the curved middle wall 30, and the opposite lower end of each grouting steel pipe pile 80 is driven downwards into the bottom surrounding rock 60.

In this alternative, as shown in fig. 1 and 4, the conduit grouting rod 70 includes a hollow grouting rod body 71, and a second grouting body 72 for integrally connecting the conduit grouting rod 70 with the bottom foundation. The wall surface of the grouting rod body 71 is provided with a slurry leakage hole 701 penetrating through the wall surface, the driving end of the grouting rod body 71 extends into a conical head, and the opposite grouting end is opened for injecting slurry into the grouting rod body 71. The second grouting body 72 is filled in the grouting rod body 71 and the grout leakage hole 701 and penetrates into the bottom foundation.

In the above scheme, as shown in fig. 4 and 5, the grouting rod body 71 is a steel pipe, and mainly plays a role in reinforcing and bearing; grouting the steel pipe through a grouting opening in the grouting rod body 71, wherein the grout leakage hole 701 can enable grout to penetrate into the surrounding rock through the steel pipe to form a second grouting body 72 and form a whole with the surrounding rock; the driving end of the steel pipe extends into a conical head, so that the steel pipe can be conveniently driven; a section of the steel pipe close to the grouting end is not provided with the slurry leakage hole 701 to form a reserved slurry stop section 702, and the reserved slurry stop section can guarantee grouting pressure loss and prevent slurry leakage from a pipe opening, so that slurry can be conveniently pressed in. By constructing the conduit grouting rod 70 in the foundation at the bottom of the curved middle wall 30, the steel pipe is provided with a plurality of slurry leakage holes 701, and slurry permeates into the surrounding rock along with the slurry leakage holes 701 through the grouting effect after the steel pipe is inserted into the foundation and forms a whole with the surrounding rock. The pipe grouting rod 70 is adopted to reinforce the foundation at the bottom of the curved middle wall 30, so that the bearing capacity and the uneven deformation resistance of the foundation can be improved. Specifically, the steel pipe is a hot-rolled seamless steel flower pipe, the outer diameter is 50mm, the wall thickness is 5mm, and the length of the steel pipe is 4 m; as shown in fig. 5, the catheter grouting rods 70 are arranged in a quincunx pattern, with a spacing of 500mm by 500mm and an external insertion angle of about 3-5 °; the aperture of the slurry leaking hole 701 is about 8mm, the hole spacing is 150mm, the slurry leaking hole is arranged in a quincunx shape, and the front end of the slurry leaking hole is processed into a cone shape; the grouting body is made of cement slurry, the water cement ratio is 0.5: 1-1: 1, and the grouting pressure is about 0.5-1MPa, or determined according to field tests.

In this alternative, as shown in fig. 1, 6 and 7, the grouting steel pipe pile 80 includes a hollow steel pipe body 81, a reinforcement cage 82 for enhancing the structural strength and rigidity of the grouting steel pipe pile 80, and a third grouting body 83 for integrally connecting the grouting steel pipe pile 80 and the bottom surrounding rock 60. The wall surface of the steel pipe body 81 is provided with a slurry outlet hole 801 penetrating through the wall surface, the driving end of the steel pipe body 81 extends into a conical head, and the opposite grouting end is opened for injecting slurry into the steel pipe body 81. The reinforcement cage 82 extends along the longitudinal direction of the steel pipe 81 and is disposed in the steel pipe 81.

In the above scheme, as shown in fig. 6 and 7, the steel pipe body 81 and the reinforcement cage 82 mainly play a role in reinforcing, so as to enhance the strength and rigidity of the pile body; the grout outlet 801 on the steel pipe body 81 plays a role of leaking grout, so that grout can conveniently leak out of the steel pipe body 81 to form the third grout 83 and be integrated with the bottom surrounding rock 60. The grouting steel pipe piles 80 are large in overall rigidity and flexible in arrangement, and the overall effect between the curved middle wall 30 and the bottom surrounding rock 60 can be further enhanced by symmetrically arranging the grouting steel pipe piles 80 in the foundation at the bottom of the curved middle wall 30, so that the deflection resistance of the curved middle wall 30 is improved. Specifically, a grout hole 801 is drilled in the steel pipe body 81, the hole diameter is 0.8-1.5 cm, and the hole distance is about 15 cm; after the steel pipe body 81 and the steel reinforcement cage 82 are hung, M30 grouting body is adopted for filling, and grouting pressure can be 0.3-0.5 MPa; after the slurry overflows from the inside and the outside of the steel pipe body 81, closing the orifice and pressurizing for a period of time, and stopping injecting after the slurry overflows again; the non-drilling and grout-stopping section of the steel pipe body 81 is larger than 1.0m, the pipe diameter of the grouting steel pipe pile 80 can be 10-30 cm, and the specific parameters are determined according to engineering practice.

Alternatively, as shown in fig. 1, the number of primary locking anchors 90 is plural, and the plural primary locking anchors 90 are radially spaced. The grouting end of each primary support locking anchor rod 90 is welded and fixed with the primary lining steel arch of the left hole 10 or the right hole 20, and the opposite driving end is driven into the external surrounding rock 110 by the side wall and the vault of the left hole 10 or the right hole 20, so that the left hole 10, the right hole 20 and the primary support locking anchor rod 90 can be uniformly stressed, and the stress states of the left hole 10, the right hole 20 and the primary support locking anchor rod 90 are improved.

In this alternative, the structure of the primary locking anchor rod 90 is the same as that of the hollow anchor rod 50 at the top of the wall, and the tail of the primary locking anchor rod 90 is welded firmly with the primary lining steel arch of the left hole 10 and the right hole 20, so that the external surrounding rock 110 and the primary supporting structure form a whole.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a crooked well wall deflection prevention structure of multiple arch tunnel under topographic bias, its characterized in that includes:

the device comprises a curved middle wall (30) connected between a left hole (10) and a right hole (20), a wall top hollow anchor rod (50) used for enhancing the connection stability between the curved middle wall (30) and top surrounding rock (40), a bottom reinforcing pipe group used for enhancing the connection stability between the curved middle wall (30) and bottom surrounding rock (60), and a primary support locking anchor rod (90) used for converting the curved middle wall (30) from a concentrated bias stress state to a distributed bias stress state;

one end of the wall top hollow anchor rod (50) is connected into the curved middle wall (30), and the other opposite end of the wall top hollow anchor rod is driven upwards into the top surrounding rock (40);

one end of the bottom reinforced pipe group is connected into the curved middle wall (30), and the other opposite end of the bottom reinforced pipe group is driven downwards into the bottom surrounding rock (60);

the primary support locking anchor rod (90) is driven into an external surrounding rock (110) through the left hole (10) and the right hole (20) respectively.

2. The arching tunnel curved middle wall anti-deflection structure under terrain bias according to claim 1,

the structural reinforcement of the curved middle wall (30) comprises circumferential reinforcements (301) for constructing an appearance framework of the curved middle wall (30), wherein the appearance framework comprises two side wall frames positioned at two sides, and a top surface frame and a bottom surface frame which are oppositely arranged up and down and are respectively connected with the two side wall frames;

the structural reinforcement of the curved middle wall (30) further comprises longitudinal steel bars (302) which are arranged at intervals in sequence along the outer peripheral line of the outline framework and extend longitudinally, and transverse stirrups (303) connected between the two side ledges.

3. The structure of claim 2, wherein the curved middle wall of the lower arch tunnel is provided with a plurality of grooves,

the structural reinforcement of the curved middle wall (30) also comprises a reinforcing stirrup (304) for reinforcing the integral strength of the structure;

the reinforcement stirrups (304) are connected between the top surface frame and the two side ledges and between the bottom surface frame and the two side ledges.

4. The arching tunnel curved middle wall anti-deflection structure under terrain bias according to claim 1,

the number of the wall top hollow anchor rods (50) is multiple, and the multiple wall top hollow anchor rods (50) are distributed at radial intervals.

5. The structure for preventing deflection of curved middle wall of multi-arch tunnel under terrain bias according to claim 4,

the wall top hollow anchor rod (50) comprises a hollow anchor rod body (51), a plastic expansion shell (52) connected to the injection end of the hollow anchor rod body (51), an anchoring part (53) connected to the grouting end of the hollow anchor rod body (51), an exhaust pipe (54) used for exhausting gas during grouting, and a first grouting body (55) used for connecting the wall top hollow anchor rod (50) and the top surrounding rock (40) into a whole;

the wall surface of the hollow anchor rod body (51) is provided with a grouting hole (501) penetrating through the wall surface, the grouting end of the hollow anchor rod body (51) is connected with a structural reinforcement at the top of the curved middle wall (30) through the anchoring piece (53), the opposite driving end is upwards driven into the top surrounding rock (40), and the plastic expansion shell (52) expands after being stressed to enhance the pulling resistance;

one end of the exhaust pipe (54) is positioned between the hollow anchor rod body (51) and the anchor rod hole, and the other opposite end of the exhaust pipe extends out of the anchor rod hole;

the first grouting body (55) is filled in the hollow anchor rod body (51), the grouting hole (501) and the anchor rod hole and permeates into the top surrounding rock (40).

6. The arching tunnel curved middle wall anti-deflection structure under terrain bias according to claim 1,

the bottom reinforcing pipe group comprises a guide pipe grouting rod (70) used for reinforcing the bottom foundation of the curved middle wall (30) and a grouting steel pipe pile (80) used for enhancing the connection strength between the curved middle wall (30) and the bottom surrounding rock (60);

the number of the guide pipe grouting rods (70) is multiple, the guide pipe grouting rods (70) are arranged in a radial mode at intervals, the upper end of each guide pipe grouting rod (70) is located in the bottom plate of the curved middle wall (30), and the opposite lower end of each guide pipe grouting rod is downwards driven into the bottom foundation;

the number of the grouting steel pipe piles (80) is multiple, the grouting steel pipe piles (80) are arranged in a radial mode at intervals, the upper end of each grouting steel pipe pile (80) is connected into the curved middle wall (30), and the opposite lower end of each grouting steel pipe pile is driven downwards into the bottom surrounding rock (60).

7. The arching tunnel curved middle wall anti-deflection structure under terrain bias according to claim 6,

the conduit grouting rod (70) comprises a hollow grouting rod body (71) and a second grouting body (72) for integrally connecting the conduit grouting rod (70) and the bottom foundation;

a slurry leakage hole (701) penetrating through the wall surface is formed in the wall surface of the grouting rod body (71), the driving end of the grouting rod body (71) extends into a conical head, and the opposite grouting end of the grouting rod body is opened to allow slurry to be injected into the grouting rod body (71);

and the second grouting body (72) is filled in the grouting rod body (71) and the grout leakage hole (701) and permeates into the bottom foundation.

8. The arching tunnel curved middle wall anti-deflection structure under terrain bias according to claim 6,

the grouting steel pipe pile (80) comprises a hollow steel pipe body (81), a reinforcement cage (82) for enhancing the structural strength and rigidity of the grouting steel pipe pile (80), and a third grouting body (83) for integrally connecting the grouting steel pipe pile (80) with the bottom surrounding rock (60);

a slurry outlet hole (801) penetrating through the wall surface is formed in the wall surface of the steel pipe body (81), the driving end of the steel pipe body (81) extends into a conical head, and the opposite grouting end of the steel pipe body is opened to allow slurry to be injected into the steel pipe body (81);

the reinforcement cage (82) extends and is arranged in the steel pipe body (81) along the length direction of the steel pipe body (81).

9. The arching tunnel curved middle wall anti-deflection structure under terrain bias according to claim 1,

the number of the primary support locking anchor rods (90) is multiple, and the primary support locking anchor rods (90) are arranged in a radial shape at intervals;

and the grouting end of each primary support locking anchor rod (90) is welded and fixed with the primary lining steel arch of the left hole (10) or the right hole (20), and the opposite driving end is driven into the external surrounding rock (110) by the side wall and the vault of the left hole (10) or the right hole (20).

10. The arching tunnel curved middle wall anti-deflection structure under terrain bias of claim 9,

the structure of the primary support locking anchor rod (90) is the same as that of the wall top hollow anchor rod (50).

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