CN217354406U

CN217354406U - Tunnel deformation tunnel body supporting structure

Info

Publication number: CN217354406U
Application number: CN202221212435.9U
Authority: CN
Inventors: 王添新; 张亚平; 吴银宝; 易帅; 徐庭; 陈为民; 万猛; 薛克进; 陈丹; 孙小强; 张晓光; 李小童; 刘东兴; 刘康; 冉路尧; 李鸿飞
Original assignee: CCCC Second Harbor Engineering Co
Current assignee: CCCC Second Harbor Engineering Co
Priority date: 2022-05-20
Filing date: 2022-05-20
Publication date: 2022-09-02
Anticipated expiration: 2032-05-20

Abstract

The utility model provides a tunnel warp hole body supporting construction, many steel bodys constitute the grid bow member that forms annular structure, and grid bow member inboard is equipped with many steel bodys and constitutes annular structure steel bow member, is provided with outer reinforcing bar net between steel bow member and the grid bow member, and the steel bow member inner wall is provided with inlayer reinforcing bar net, and steel bow member bottom open position is provided with down the step bow member, and lower step bow member forms the closed loop with the steel bow member. The design adopts the supporting structure of sprayed concrete + double-layer arch centering + reinforcing mesh + radial grouting + steel pipe big lock foot, utilizes the sprayed concrete to spout the excavation face just after steady, installs double-layer arch centering and forms and lets press supporting construction, adopts radial grouting consolidation hole body pine circle country rock simultaneously, hangs net compound shotcrete to design thickness formation support system at last.

Description

Tunnel warp body supporting construction

Technical Field

The utility model belongs to the technical field of the steel bow member construction and specifically relates to a tunnel warp body supporting construction.

Background

With the rapid development of highway engineering in China, the geological background faced by engineering construction is more complex, and the tunnel used as a construction engineering for excavating and penetrating geological rock strata is more influenced by geological factors such as strata, structures and the like. In recent years, aiming at the problem of large deformation of a soft rock tunnel passing through a fold area, the method is always a hotspot of research in the field of tunnel construction, and through research on structural stress and surrounding rock lithology of the fold area, a support structure such as a double-layer steel arch frame and a yielding anchor rod is provided on the basis of an unloading high ground stress release and bonding support principle in engineering, so that a better application effect is obtained in engineering practice. However, as the tunnel gradually deepens to a complex geological environment, the weak surrounding rock of the tunnel is easy to loosen after being influenced by stress concentration, and the vault collapse problem is caused, and the effect of net hanging and spraying in the traditional supporting mode is less for solving the problems; meanwhile, because surrounding rock at the front end of the tunnel face is affected by stress concentration, the tight closing of surrounding rock cracks causes the limitation of advanced grouting, so that after the surrounding rock is loosened after excavation and is graveled, the surrounding rock is poured along the gap of the primary support arch frame, the situation that the deformation of the tunnel body is not converged is continuously caused, and the design expectation is difficult to achieve by adopting the traditional arch frame supporting structure. In the construction process of opening the cave body of the rocky tunnel under the condition of intense physical and chemical weathering of the fold core area, under the traditional support systems such as double-layer arch frames and yielding anchor rods, the situations of deformation and non-convergence of the cave body and collapse of loose surrounding rocks in a construction site still occur, and the technical problem of supporting the loose surrounding rocks under the condition of stress concentration in the research of treating the deformation of the soft rock tunnel cave body in the fold core area is obvious. Therefore, in order to solve the above problems, it is necessary to design a supporting system capable of solving the problems of structural stress concentration and large deformation of the surrounding rock tunnel body.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a tunnel deformation tunnel body supporting structure, which solves the problem that soft surrounding rocks are easy to loosen and vault collapse occurs after being influenced by stress concentration, and the net hanging spraying and mixing in the traditional supporting mode has less effect on solving the problem; meanwhile, because surrounding rock at the front end of the tunnel face is affected by stress concentration, the tight closing of surrounding rock cracks causes the limitation of advanced grouting, so that after the surrounding rock is loosened after excavation, the surrounding rock is graveled along the clearance of the primary support arch frame, and the problem of the situation that the deformation of the tunnel body is not converged is continuously caused.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: the utility model provides a tunnel warp shaft supporting construction, many steel bodies constitute the grid bow member of loop configuration, and grid bow member inboard is equipped with many steel bodies and constitutes loop configuration steel bow member, is provided with outer reinforcing bar net between steel bow member and the grid bow member, and the steel bow member inner wall is provided with inlayer reinforcing bar net, and steel bow member bottom open position is provided with down the step bow member, and lower step bow member forms the closed loop with the steel bow member.

In the preferred scheme, the outer wall of the grid arch is also provided with a plurality of vertically arranged steel perforated pipes.

In the preferred scheme, the steel arch frame and the outer part of the grid arch frame are provided with a plurality of locking anchor pipes which are obliquely arranged downwards.

In the preferred scheme, the grid arch, the lower step arch and the steel arch are assembled by connecting rigid bodies through first arch connectors.

In the preferred scheme, the structure of first bow member connector is: the second fixed plate both sides of the second steel body are provided with the location jack catch, and the location jack catch passes the second fixed plate and is connected with the axis of rotation, and the first fixed plate both sides card of the first steel body is on the location jack catch, and first fixed plate and second fixed plate are connected through a plurality of double-end nuts.

In the preferred scheme, the second steel body both sides still are equipped with the sliding tray, and axis of rotation one end is equipped with the slider, and the slider setting is inside the sliding tray, and the slider is spacing in the inside axial of sliding tray.

In the preferred scheme, the lower surface of the clamping groove of the positioning clamping jaw is flush with the surface of the second fixing plate;

the first fixing plate is also provided with a plurality of first angle fixing screws which penetrate through the first fixing plate and abut against the surface of the second fixing plate;

one side of the first fixing plate is of a wedge-shaped structure, the wedge-shaped structure is clamped inside the clamping groove of the positioning clamping jaw, a limiting boss is arranged on one side of the wedge-shaped structure, and the boss abuts against one side of the positioning clamping jaw for limiting;

bolt holes on the second fixing plate are all kidney-shaped holes.

In the preferred scheme, the lower step arch and the steel arch are connected through a second arch connector.

In the preferred scheme, the structure of second bow member connector does: a third fixing plate is arranged on one side of the steel arch frame, limiting clamping jaws are arranged on two sides of the third fixing plate, the limiting clamping jaws penetrate through the third fixing plate, a limiting plate is arranged at the tail ends of the limiting clamping jaws, a fourth fixing plate at the end part of the lower step arch frame is clamped on the limiting clamping jaws, and the fourth fixing plate is connected with the third fixing plate through a plurality of stud bolts;

bolt holes in the third fixing plate are all kidney-shaped holes;

still be equipped with a plurality of second angle set screws on the fourth fixed plate, the second angle set screw passes the fourth fixed plate and supports and lean on the third fixed plate.

The utility model provides a tunnel deformation body of a cave supporting construction, the utility model discloses to the weak country rock characteristic of fold nuclear region tunnel body of a cave, under the limited prerequisite of considering advance slip casting, utilize double-deck bow member to let the mechanism of pressing to carry out slip casting consolidation treatment to the loose country rock after digging, directly solve loose country rock gravel collapse problem after the tectonic stress concentrates the extrusion, form consolidation country rock self-stabilization circle in the pine circle of a cave body within range simultaneously, differentiation part body of a cave supporting pressure, compare in the traditional supporting construction of direct reinforcing supporting construction rigidity, density, have with strong points, the practicality is high, the convenient advantage of economy.

Drawings

The invention will be further explained with reference to the following figures and examples:

FIG. 1 is a schematic view of the whole construction of the utility model;

fig. 2 is a multi-layer schematic view of the supporting structure of the present invention;

fig. 3 is a schematic diagram of concrete layer wrapping of the present invention;

FIG. 4 is a schematic diagram of the excavation construction of the upper bench of the utility model;

FIG. 5 is a schematic diagram of construction after excavation of the middle step of the utility model;

FIG. 6 is a schematic diagram of the construction after excavation of the lower step and the inverted arch of the utility model;

FIG. 7 is a schematic diagram of the concrete-shotcrete construction of the present invention;

fig. 8 is a front view structural diagram of the first arch connector of the present invention;

fig. 9 is a rear front view structural diagram of the first arch connector of the present invention after angle adjustment;

fig. 10 is a side view structural diagram of the first arch connector of the present invention;

fig. 11 is a side view of the first angle fixing screw locking angle structure of the first arch connector of the present invention;

fig. 12 is a disassembled structure view of the first arch connector of the present invention;

fig. 13 is a cross-sectional structural view of the first arch connector of the present invention;

fig. 14 is a front view structural diagram of a second arch connector of the present invention;

fig. 15 is a side view structural diagram of the installation of the second arch connector of the present invention;

fig. 16 is a structural view of the angle adjustment of the second arch connector of the present invention;

fig. 17 is a second arch connector dismantling structure diagram of the present invention.

In the figure: a grille arch 1; a first steel body 101; a second steel body 102; a first fixing plate 103; a second fixing plate 104; a slide groove 105; a steel perforated pipe 2; a first arch connector 3; a positioning claw 301; a rotating shaft 302; a first angle set screw 303; a slider 304; an outer layer reinforcing mesh 4; a steel arch 5; a third fixing plate 501; an inner layer steel bar mesh 6; a first lockpin anchor tube 7; a second lock leg anchor tube 8; a third lock leg anchor tube 9; a second arch connector 10; a limit jaw 1001; the limiting plate 1002; a lower step arch 11; a fourth fixing plate 1101; a second angle set screw 1102; a concrete layer 12; the concrete 13 is sprayed.

Detailed Description

Example 1

As shown in fig. 1 to 17, in the tunnel deformed tunnel body supporting structure, a plurality of steel bodies form a grid arch frame 1 of a ring structure, a plurality of steel bodies form a ring structure steel arch frame 5 inside the grid arch frame 1, an outer layer reinforcing mesh 4 is arranged between the steel arch frame 5 and the grid arch frame 1, an inner layer reinforcing mesh 6 is arranged on the inner wall of the steel arch frame 5, a lower step arch frame 11 is arranged at the bottom opening position of the steel arch frame 5, and the lower step arch frame 11 and the steel arch frame 5 form a closed loop. The outer wall of the grille arch 1 is also provided with a plurality of vertically arranged steel floral tubes 2. And a plurality of locking anchor pipes which are obliquely arranged downwards are arranged outside the steel arch frame 5 and the grille arch frame 1. The grating arch 1, the lower step arch 11 and the steel arch 5 are all assembled by connecting rigid bodies through the first arch connector 3. 2 locking anchor pipes with the length of 6m and the length of phi 108 and 6mm are respectively arranged on the upper step arch springing and the middle step arch springing of the grid arch frame 1, 2 locking anchor pipes with the length of 4.5m and the length of phi 42 and 4mm are respectively arranged on the lower step arch springing, and the outer layer steel bar mesh 4 is arranged on the inner side of the grid arch frame 1 and is arranged according to the working procedures in the step-by-step construction; the phi 42 x 4mm steel perforated pipes 2 are arranged in a quincunx shape along the circumferential direction of the hole body at intervals of 1.2 x 1.2 m, cement slurry is adopted, the water cement ratio is 1:1, and the grouting pressure is 0.5-1 Mpa.

2 locking anchor pipes with the length of 4.5m and the length of phi 42 x 4mm are arranged at the arch springing position of the steel arch frame 5, the inner layer reinforcing mesh 6 is arranged at the inner side of the lattice steel arch frame 5 and is arranged according to the working procedures in the step construction; the sprayed concrete 13 comprises an integral supporting system to form a concrete layer 12 structure, as shown in fig. 3, the structure is sprayed layer by layer according to the working procedures in the construction process, the hole body is initially sprayed for 2-5 cm after being excavated, and the outer layer reinforcing mesh 4 is installed and then sprayed layer by layer again to the designed thickness. The arch centering is connected in the hole after being processed by sections, all the sections of arch centering are connected by adopting a connector, the arch wall and the arch top are provided with a first arch centering connector 3, and the inverted arch and the arch foot are provided with a second arch centering connector 10, which are all traditional connection processes.

Aiming at the problem that the tight closed advanced support of the surrounding rock cracks at the front part of the tunnel face is limited under the condition of structural stress concentration and the large deformation of the tunnel body is caused by the loose collapse of the extremely broken surrounding rock at the excavated section, when an outer layer small-rigidity grid arch and a large foot-locking anchor pipe are used for excavating on an upper step and a middle step, the surrounding rock is deformed and unloaded under the condition of certain support resistance, meanwhile, a grouting steel floral pipe is adopted for grouting and solidifying a loose ring of the tunnel body when the surrounding rock is unloaded and the cracks are opened, the loose surrounding rock is solidified to prevent the collapse of the loose surrounding rock and construct a surrounding rock self-stabilizing ring to reduce the support resistance, a support main body structure is formed by combining an inner layer large-rigidity steel arch, and finally, after net hanging and anchor spraying, a closed loop is installed on an inverted arch to form a complete support system.

Example 2

As shown in fig. 8 to 13, in a preferred embodiment, the first arch connector 3 has a structure that: two sides of a second fixing plate 104 of the second steel body 102 are provided with positioning claws 301, the positioning claws 301 penetrate through the second fixing plate 104 to be connected with a rotating shaft 302, two sides of a first fixing plate 103 of the first steel body 101 are clamped on the positioning claws 301, and the first fixing plate 103 is connected with the second fixing plate 104 through a plurality of double-headed nuts. The grating arch 1, the lower step arch 11 and the steel arch 5 are all assembled by connecting rigid bodies through the first arch connector 3. The first arch connector 3 is mainly connected by a plurality of double nuts through the first fixing plate 103 and the second fixing plate 104 and is simply positioned by the positioning claws 301 to assemble the grille arch 1, the lower step arch 11 and the steel arch 5, and the assembly efficiency is high.

Preferably, sliding grooves 105 are further formed in two sides of the second steel body 102, a sliding head 304 is arranged at one end of the rotating shaft 302, the sliding head 304 is arranged inside the sliding grooves 105, and the sliding head 304 is axially limited inside the sliding grooves 105. The positioning claw 301 rotates through the rotating shaft 302, and the sliding head 304 at the end of the rotating shaft 302 slides up and down or rotates in the sliding groove 105, so that the sliding head 304 can rotate at multiple angles, the connecting angle between the second steel body 102 and the second steel body 102 can be changed, and the structure shown in fig. 9 is suitable for different arc-shaped structures.

In a preferable scheme, the lower surface of the clamping groove of the positioning clamping jaw 301 is flush with the surface of the second fixing plate 104; the second fixing plate 104 can be conveniently clamped into the clamping groove of the positioning claw 301.

A plurality of first angle fixing screws 303 are further arranged on the first fixing plate 103, and the first angle fixing screws 303 penetrate through the first fixing plate 103 and abut against the surface of the second fixing plate 104; the first angle fixing screw 303 facilitates fixing the connection angle between the second steel body 102 and the second steel body 102.

One side of the first fixing plate 103 is of a wedge-shaped structure, the wedge-shaped structure is clamped inside the clamping groove of the positioning clamping jaw 301, a limiting boss is arranged on one side of the wedge-shaped structure, and the boss abuts against one side of the positioning clamping jaw 301 for limiting; the position of the first fixing plate 103 can be positioned and simply fixed.

The bolt holes of the second fixing plate 104 are all kidney-shaped holes. Waist type hole can multi-angle locking.

Example 3

As shown in fig. 14 to 17, in a preferred embodiment, the lower step arch 11 and the steel arch 5 are connected by a second arch connector 10. The structure of the second arch connector 10 is: a third fixing plate 501 is arranged on one side of the steel arch frame 5, limiting claws 1001 are arranged on two sides of the third fixing plate 501, the limiting claws 1001 penetrate through the third fixing plate 501, a limiting plate 1002 is arranged at the tail end of each limiting claw 1001, a fourth fixing plate 1101 at the end part of the lower step arch frame 11 is clamped on the limiting claws 1001, and the fourth fixing plate 1101 is connected with the third fixing plate 501 through a plurality of stud bolts; the second arch connector 10 can be connected with the steel arch 5 and the lower step arch 11, the angle between the lower step arch 11 and the steel arch 5 can be adjusted through the second arch connector 10, and the limiting clamping jaws 1001 are used for limiting the position of a fourth fixing plate 1101 of the lower step arch 11.

Bolt holes in the third fixing plate 501 are all kidney-shaped holes; waist type hole can multi-angle locking.

A plurality of second angle fixing screws 1102 are further arranged on the fourth fixing plate 1101, and the second angle fixing screws 1102 penetrate through the fourth fixing plate 1101 and abut against the third fixing plate 501; the second angle fixing screw 1102 facilitates fixing the connection angle between the lower step arch 11 and the steel arch 5.

Example 4

Further explaining by combining with the embodiment 1, as shown in the structures shown in fig. 1-17, after the upper step of the hole body is excavated, 2-5 cm of sprayed concrete 13 is initially sprayed, a grid arch frame 1 is installed, two first locking anchor pipes 7 with the length of 6m and the diameter of 108 x 6m are arranged at the arch springing, and then an outer layer reinforcing mesh 4 is installed to complete the upper step support; the utility model discloses an effective effect does: surrounding rocks are supported by the small-rigidity grid arch 1, the surrounding rocks deform and release stress after extruding the grid arch 1 to form an initial unloading system, and meanwhile, the integral stability of the grid arch 1 is enhanced by adopting a high-strength locking anchor pipe, so that the instability of the arch is avoided.

After the step in the tunnel body is excavated, 2-5 cm of sprayed concrete 13 is sprayed for the first time, a grid arch 1 is installed, two second locking anchor pipes 8 with the length of 6m and the diameter of 108 mm are arranged at the arch foot, and then an outer reinforcing mesh 4 is installed to complete the support of the step.

Judging whether the deformation of the hole body reaches the reserved deformation amount according to the monitoring measurement data, arranging radial phi 42 x 4mm steel perforated pipes 2 in a quincunx shape with the interval of 1.2 x 1.2 m when the deformation of the hole body reaches the reserved deformation amount, and grouting by adopting cement grout with the water cement ratio of 1:1, wherein the grouting range is not less than the size of the loose ring;

after grouting, installing an inner layer steel arch frame 5 and an inner layer steel mesh 6, arranging a third foot locking anchor pipe 9 with the length of 4.5m and the phi 42 x 4mm at the arch foot of the arch frame, and spraying a concrete layer 12 to the designed thickness in a layered and multiple spraying way, wherein the outer layer steel mesh 4 is wrapped by the thickness to form a middle and upper step supporting system;

when the deformation of the hole body does not reach the reserved deformation, the working procedure is adjusted on site to install the steel arch frame 5, and real-time monitoring is carried out for guiding the time of radial grouting; when the deformation of the hole body does not reach the reserved deformation, the working procedure is adjusted on site to install the steel arch frame 5, and real-time monitoring is carried out to guide the time of radial grouting. The utility model discloses an effective effect does: the method has the advantages that the annular loose ring of the tunnel body is reinforced by radial grouting by utilizing the opening gap of the surrounding rock cracks after the tunnel body is unloaded, so that the extremely broken surrounding rock in a stress concentration area is prevented from being loosened and collapsed, and meanwhile, the self-stability of the surrounding rock ring is improved to reduce the supporting resistance of the tunnel body.

After the lower step and the inverted arch are excavated, 2-5 cm of sprayed concrete 13 is sprayed for the first time, a grid arch 1, an outer layer reinforcing mesh 4, a steel arch 5 and an inner layer reinforcing mesh 6 are sequentially installed, and a third locking anchor pipe 9 with the length of 6m and the length phi 108 x 6mm is arranged at the arch foot.

Then spraying concrete to the designed thickness in a layered and repeated way, wherein the outer layer reinforcing mesh 4 and the lower step arch center 11 are wrapped by the thickness.

Synchronously installing a steel arch frame 5 closed supporting ring structure at the inverted arch, and backfilling the inverted arch; the utility model discloses an effective effect does: the front grid arch 1 structure stability of the arch closed loop is improved by adopting phi 108 x 6mm locking anchor pipes, and sufficient construction time is provided for excavating the arch closed loop by an inverted arch.

The arch centering is connected in the hole after being processed by sections, all sections of arch centering are connected by adopting a connector, the arch wall and the arch crown are assembled by a first arch centering connector 3, and the inverted arch and the arch foot are connected by a second arch centering connector 10.

The above-mentioned embodiments are merely preferred embodiments of the present invention, and should not be considered as limitations of the present invention, and the protection scope of the present invention should be defined by the technical solutions described in the claims, and includes equivalent alternatives of technical features in the technical solutions described in the claims. I.e., equivalent alterations and modifications within the scope of the invention, are also intended to be covered by the scope of this invention.

Claims

1. The utility model provides a tunnel warp body of a cave supporting construction, characterized by: the grid arch centering (1) of the ring structure is formed by a plurality of steel bodies, the inner side of the grid arch centering (1) is provided with a plurality of steel bodies to form a ring structure steel arch centering (5), an outer layer reinforcing mesh (4) is arranged between the steel arch centering (5) and the grid arch centering (1), the inner wall of the steel arch centering (5) is provided with an inner layer reinforcing mesh (6), the bottom opening position of the steel arch centering (5) is provided with a lower step arch centering (11), and the lower step arch centering (11) and the steel arch centering (5) form a closed loop.

2. The deformed tunnel body supporting structure of claim 1, wherein: the outer wall of the grille arch frame (1) is also provided with a plurality of vertically arranged steel floral tubes (2).

3. The deformed tunnel body supporting structure of claim 1, wherein: and a plurality of locking anchor pipes which are obliquely arranged downwards are arranged outside the steel arch (5) and the grating arch (1).

4. The deformed tunnel body supporting structure of claim 1, wherein: the grating arch centering (1), the lower step arch centering (11) and the steel arch centering (5) are all assembled by connecting rigid bodies through the first arch centering connector (3).

5. The deformed tunnel body supporting structure of claim 4, which is characterized in that: the first arch frame connector (3) has the structure that: two sides of a second fixing plate (104) of the second steel body (102) are provided with positioning clamping jaws (301), the positioning clamping jaws (301) penetrate through the second fixing plate (104) to be connected with a rotating shaft (302), two sides of a first fixing plate (103) of the first steel body (101) are clamped on the positioning clamping jaws (301), and the first fixing plate (103) is connected with the second fixing plate (104) through a plurality of double-headed nuts.

6. The deformed tunnel body supporting structure of claim 5, wherein: sliding grooves (105) are further formed in the two sides of the second steel body (102), a sliding head (304) is arranged at one end of the rotating shaft (302), the sliding head (304) is arranged inside the sliding grooves (105), and the sliding head (304) is axially limited inside the sliding grooves (105).

7. The deformed tunnel body supporting structure of claim 5, wherein: the lower surface of the clamping groove of the positioning clamping jaw (301) is flush with the surface of the second fixing plate (104);

a plurality of first angle fixing screws (303) are further arranged on the first fixing plate (103), and the first angle fixing screws (303) penetrate through the first fixing plate (103) and abut against the surface of the second fixing plate (104);

one side of the first fixing plate (103) is of a wedge-shaped structure, the wedge-shaped structure is clamped inside a clamping groove of the positioning clamping jaw (301), a limiting boss is arranged on one side of the wedge-shaped structure, and the boss abuts against one side of the positioning clamping jaw (301) for limiting;

bolt holes on the second fixing plate (104) are all kidney-shaped holes.

8. The deformed tunnel body supporting structure of claim 1, wherein: the lower step arch (11) and the steel arch (5) are connected through a second arch connector (10).

9. The deformed tunnel body supporting structure of claim 1, which is characterized in that: the structure of the second arch connector (10) is as follows: a third fixing plate (501) is arranged on one side of the steel arch frame (5), limiting clamping jaws (1001) are arranged on two sides of the third fixing plate (501), the limiting clamping jaws (1001) penetrate through the third fixing plate (501), a limiting plate (1002) is arranged at the tail ends of the limiting clamping jaws (1001), a fourth fixing plate (1101) at the end part of the lower step arch frame (11) is clamped on the limiting clamping jaws (1001), and the fourth fixing plate (1101) is connected with the third fixing plate (501) through a plurality of stud bolts;

bolt holes in the third fixing plate (501) are all kidney-shaped holes;

a plurality of second angle fixing screws (1102) are further arranged on the fourth fixing plate (1101), and the second angle fixing screws (1102) penetrate through the fourth fixing plate (1101) and abut against the third fixing plate (501).