CN219220444U

CN219220444U - Horseshoe-shaped tunnel arch frame supporting structure

Info

Publication number: CN219220444U
Application number: CN202320362707.1U
Authority: CN
Inventors: 刘雪山; 王森; 宋宝强; 田奇; 林华; 李洋; 李强; 罗锋寿; 陶瑜; 李波; 陈梦
Original assignee: Sinohydro Bureau 1 Co Ltd
Current assignee: Sinohydro Bureau 1 Co Ltd
Priority date: 2023-03-02
Filing date: 2023-03-02
Publication date: 2023-06-20
Anticipated expiration: 2033-03-02

Abstract

The utility model discloses a horseshoe-shaped tunnel arch support structure, which belongs to the technical field of tunnel lining, and comprises a concrete bottom cover, I-steel components fixedly connected to two ends of the concrete bottom cover and extending along the concrete bottom cover; the joint component is fixedly arranged in the middle of the I-steel component; the lock foot anchor rod is fixedly connected with the I-steel component and the joint component; the I-steel assembly comprises a first I-steel, a second I-steel and a third I-steel, and the first I-steel is fixedly connected to two ends of the concrete bottom; the lower ends of the second I-steel are connected to the upper ends of the two first I-steel; two ends of the third I-steel are fixedly connected with the upper ends of the two second I-steels respectively; the first joint component of the joint component is arranged at the joint of the concrete back cover and the first I-steel. The structure stability after this application has guaranteed I-steel support and leg joint and assembled has solved among the prior art leg joint department and lacks additional strengthening, and I-steel junction fracture problem easily after long-time use.

Description

Horseshoe-shaped tunnel arch frame supporting structure

Technical Field

The utility model relates to the technical field of tunnel lining, in particular to a supporting structure of a hoof-shaped tunnel arch frame.

Background

The horseshoe-shaped tunnel is often built in mountain areas, the rock mass condition of the tunnel crossing the mountain areas is difficult to determine, and the phenomenon of large deformation and collapse can be encountered in the construction of the tunnel in a weak surrounding rock area, so that the primary support structure of the tunnel is greatly deformed and even damaged.

The existing horseshoe-shaped tunnel needs to be prefabricated and assembled into a bracket by utilizing the I-shaped steel before pouring, and pouring is carried out along the bracket, in the prior art, the application number is 202121459850.X, the name is a foot locking anchor rod assembly, the anchor rod Kong Maogu on the locating plate is penetrated through the locating plate, so that the large deformation of the tunnel is controlled, but the reinforcement of the bracket connection part is ignored, when the bracket is assembled, the connection part of each I-shaped steel lacks a reinforcing structure, the connection part is fragile, the connection part of the I-shaped steel is easy to break after long-time use, and the long-term use of the bracket is unfavorable.

Therefore, how to provide a hoof-shaped tunnel arch supporting structure to solve the problem that the support joint lacks the additional strengthening in the prior art, the easy fracture of I-shaped steel junction after long-time use is the technical problem that the technical staff need to solve in the art.

Disclosure of Invention

Therefore, the utility model provides a horseshoe-shaped tunnel arch supporting structure, which aims to solve the problems that in the prior art, the connection part of an I-shaped steel is unfavorable for long-term use and is easy to break due to the lack of a reinforcing structure at the connection part of a bracket.

In order to achieve the above object, the present utility model provides the following technical solutions:

the utility model provides a hoof-shaped tunnel arch supporting structure, which comprises the following components:

sealing the bottom by concrete;

i-steel components fixedly connected to two ends of the concrete sealing bottom and extending along the concrete sealing bottom;

the joint assemblies are arranged in the middle of the I-steel assembly at intervals; and

and the foot locking anchor rod is fixedly connected with the I-steel component and the joint component.

Further, the i-steel assembly includes:

the two first I-beams are symmetrically arranged, and the lower ends of the two first I-beams are fixedly connected to the two ends of the concrete bottom;

the second I-steel is symmetrically provided with 2 second I-steels, and the lower ends of the two second I-steels are fixedly connected to the upper ends of the first I-steel; and

the number of the third I-steel is 1, and two ends of the third I-steel are fixedly connected with the upper ends of the two second I-steel respectively.

Further, the joint assembly includes:

the first joint assemblies are symmetrically arranged in number and are arranged at the joint of the two ends of the concrete bottom and the lower end of the first I-steel;

the second joint assemblies are symmetrically arranged in number, and are arranged at the joint of the upper end of the first I-steel and the lower end of the second I-steel; and

and the third joint assemblies are symmetrically arranged in number, and are connected to the upper ends of the two second I-beams and the two ends of the third I-beams.

Further, the first joint assembly and the second joint assembly are identical in structure, and the first joint assembly includes:

the first connecting plates are symmetrically arranged at the joints of the lower ends of the two first I-steel and the two ends of the concrete bottom;

the first A-shaped stiffening rib angle steel is embedded in the middle of the first connecting plate; and

the steel backing plate is arranged at the bottom of the first connecting plate and is coaxially arranged at the lower end of the first I-steel with the first connecting plate.

Further, the third joint assembly includes:

the second connecting plates are symmetrically arranged at the joints of the upper ends of the two second I-steels and the two ends of the third I-steel;

the second A-shaped stiffening rib angle steel is embedded in the middle of the second connecting plate and is coaxially arranged at the joint of the upper ends of the two second I-shaped steels and the two ends of the third I-shaped steel with the second connecting plate.

Further, the number of the pin locking anchor rods is 4, and the pin locking anchor rods are symmetrically welded above the joint of the first I-steel and the first joint assembly and above the joint of the second I-steel and the first joint assembly.

Further, the thickness of the first connecting plate and the second connecting plate is not less than 15mm; the thickness of the steel backing plate is not less than 15mm; the diameter of the foot locking anchor rod is not smaller than 25mm.

Further, the first I-steel and the second I-steel are arranged in the middle of the first A-shaped stiffening rib angle steel.

Further, lining concrete is arranged on the inner side of the I-steel component.

Further, the foot locking anchor rod is L-shaped.

The utility model has the following advantages:

1. according to the utility model, the H-shaped steel component is clamped at two sides of the joint by arranging the connecting plate with the thickness of 16mm, so that the looseness of the H-shaped steel component after being installed is effectively prevented, and the stability of the assembled arch frame is ensured.

2. The first joint component and the second joint component are not only provided with a first connecting plate and a first A-shaped stiffening rib angle steel, but also provided with a thick steel backing plate at the bottom of the first connecting plate, the 16mm thick steel backing plate strengthens the strength of the joint of the first I-steel and the second I-steel, and improves the stability of the joint of the first I-steel and the second I-steel.

3. According to the utility model, the phi 25 locking anchor rod is arranged and is installed with the anchor rod on the inner wall of the horseshoe-shaped tunnel, so that the tightness between the I-shaped steel component and the joint component is improved, and the shrinkage and the arch dropping of the arch leg are prevented.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present utility model, should fall within the ambit of the technical disclosure.

FIG. 1 is a schematic diagram of a supporting structure of a horseshoe tunnel arch;

FIG. 2 is a schematic view of a first connector assembly according to the present utility model;

FIG. 3 is a schematic cross-sectional view of a first connector assembly and a second connector assembly according to the present utility model;

FIG. 4 is a schematic view of the structure of the foot locking anchor rod provided by the utility model;

FIG. 5 is a schematic view of a third joint assembly according to the present utility model;

FIG. 6 is a schematic cross-sectional view of a third joint assembly according to the present utility model;

in the figure: 1. sealing the bottom by concrete; 2. an I-steel assembly; 21. a first I-steel; 22. a second I-steel; 23. a third I-steel; 3. a joint assembly; 31. a first joint assembly; 311. a first connection plate; 312. the first A-type stiffening rib angle steel; 313. a steel backing plate; 32. a second joint assembly; 33. a third joint assembly; 331. a second connecting plate; 332. the second A-type stiffening rib angle steel; 4. locking the foot anchor rod; 5. lining concrete.

Detailed Description

Other advantages and advantages of the present utility model will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model provides a horseshoe-shaped tunnel arch supporting structure, referring to fig. 1, comprising a concrete back cover 1, an I-steel component 2 and a joint component 3, wherein the concrete back cover 1 is used for lowering the ground water level below a bottom plate cushion layer in foundation construction and carrying out back cover construction above the ground water level. Stopping dewatering after the bottom sealing concrete reaches a certain strength, rapidly plugging the underground water pipe, and carrying out subsequent engineering construction such as bottom plate and the like after accumulated water is removed; the concrete back cover 1 plays a role in impermeability, and prevents water from entering the concrete due to the pressure of water.

As shown in fig. 1, the i-steel assemblies 2 are fixedly connected to two ends of the concrete back cover 1 and extend along the concrete back cover 1, and three groups of i-steels are fixedly connected to form a steel arch structure, so that the structure is suitable for a horseshoe-shaped tunnel. The I-steel belongs to high-efficiency economical cut-surface section steel, and the section shape is reasonable, so that the steel can exert efficiency more effectively, and the bearing capacity is improved.

The joint component 3 is fixedly arranged at the joint of the I-steel component 2; as shown in fig. 1 to 4, the first joint assembly 31 is used to install the first i-beam 21 at two ends of the concrete back cover 1, the second joint assembly 32 is used to install the lower end of the second i-beam 22 at the upper end of the first i-beam 21, after the installation is completed, the third joint assembly 33 is installed at the upper end of the second i-beam 22, and two ends of the third i-beam 23 are installed with the third joint assembly 33, so that the upper end of the second i-beam 22 and two ends of the third i-beam 23 are fixedly connected, and after the assembly of the i-beam assembly 2 and the joint assembly 3 is completed, the lining concrete 5 is poured on the i-beam assembly 2 to form a stable structure.

As shown in fig. 5, the foot locking anchor rod 4 is fixedly connected with the i-steel component 2, and the foot locking anchor rod 4 is installed and connected with the anchor rod on the inner wall of the horseshoe-shaped tunnel, the anchor rod on the inner wall of the horseshoe-shaped tunnel plays a role in fixing and limiting the foot locking anchor rod 4, the strength of the primary supporting structure of the tunnel is further enhanced, and the large deformation of the arch frame of the tunnel can be avoided. The lock foot stock 4 is L type to be provided with 4, the symmetry welds in first I-steel 21 and first joint component 31 junction top, and second I-steel 22 and first joint component 31 junction top have played the effect of supporting reinforcement to whole bow member structure.

Preferably, the diameter of the foot locking anchor rod 4 used in the method is 25mm, and when the step method is used for excavation, before the upper step excavation supporting is completed and the lower section is excavated, the anchor rod is driven into the arch springing obliquely downwards, so that the arch springing can be stabilized, and the advance supporting effect can be achieved for the lower excavation. During the use, install the stock that lock foot stock 4 that the diameter is 25mm and horseshoe nature tunnel inner wall, improve the stability after the concatenation of first I-steel 21.

As shown in fig. 1, the i-steel assembly 2 comprises a first i-steel 21, a second i-steel 22 and a third i-steel 23, wherein the number of the first i-steel 21 is two, and the lower ends of the first i-steel 21 are respectively and symmetrically connected to two sides of the poured concrete back cover 1; two second I-beams 22 are arranged, and the lower ends of the two second I-beams 22 are fixedly connected with the upper ends of the two first I-beams 21; the third I-steel 23 is provided with 1, and both ends symmetry and the upper end fixed connection of two second I-steels 22, can enclose into a horseshoe-shaped support from this, supports whole tunnel.

The joint assembly 3 comprises a first joint assembly 31, a second joint assembly 32 and a third joint assembly 33, wherein the first joint assembly 31 is arranged at the joint of the concrete back cover 1 and the first I-steel 21; the second joint component 32 is arranged at the joint of the first I-steel 21 and the second I-steel 22; the third joint assembly 33 connects the second h-beam 22 and the third h-beam 23; after the I-steel component 2 is spliced and installed, lining concrete 5 can be poured, so that the whole arch structure is firmer, the arch structure is more durable in a severe field environment while better supporting a tunnel, and the service life of the arch structure is prolonged.

The first joint assembly 31 and the second joint assembly 32 have the same structure, the first joint assembly 31 comprises a first connecting plate 311 and a first A-shaped stiffening rib angle steel 312, and as shown in FIG. 6, the first connecting plate 311 is two steel plates with the thickness of 16mm, which are adopted by the joint assembly 3; compared with the prior connecting mode, the mode improves the stability of the H-shaped steel assembly 2 after being assembled.

As shown in fig. 3 and 4, the structure further includes a first a-type stiffener angle steel 312, and the stiffening ribs are disposed on two sides of the angle steel, so that the stiffness and hardness of the first a-type stiffener angle steel 312 are relatively high, the first a-type stiffener angle steel 312 is embedded in the middle of the first connecting plate 311, and the i-steel assembly 2 is clamped by the first connecting plate 311 in bilateral symmetry, and then is tightly fixed by bolts and nuts. The design can prevent the first I-steel 21, the second I-steel 22 and the third I-steel 23 from loosening after being spliced and installed, and effectively improves the stability of the I-steel assembly 2 after being spliced and the service life of the whole horseshoe-shaped tunnel arch frame.

As shown in fig. 2 and 4, the first joint assembly 31 and the second joint assembly 32 further include a steel backing plate 313, and the steel backing plate 313 is disposed at the bottom of the first connecting plate 311; when the third joint assembly 33 is installed, the first A-shaped stiffening rib angle steel 312 is installed in the middle of the first connecting plate 311, the first connecting plate 311 is used for clamping the third I-steel 23, the third I-steel 23 is installed, the first connecting plate 311 and the steel backing plate 313 are fixedly connected through bolts and nuts, the joint assembly 3 is stronger due to the arrangement of the steel backing plate 313, and the joint of the I-steel assembly 2 is firmer.

As a preferred embodiment, the first connection plate 311 is provided to be 16mm thick; likewise, the steel backing plate 313 is also set to be 16mm thick. The steel plate with the specification of 16mm selected in the application is a middle plate, is of a Q345 type, is a low-alloy high-strength steel plate, has good plasticity and weldability, is used as a structure for bearing dynamic load of building structures, bridges and the like, and is also suitable for cold areas above-40 ℃; therefore, the first connecting plate 311 and the steel backing plate 313 in the application are made of the material, so that the bearing effect of the arch can be ensured, and the arch centering device can be suitable for various temperatures and various field environments.

As shown in fig. 3, the first joint component 31 and the second joint component 32 are composed of a first connecting plate 311 with a thickness of 16mm and a first a-type stiffening rib angle steel 312, the first a-type stiffening rib angle steel 312 is embedded in the middle of the first connecting plate 311, and in order to improve the tightness of the first joint component 31 and the second joint component 32 after being installed, a steel backing plate 313 is arranged at the bottom of the first connecting plate 311; the steel backing plate 313 is disposed at the lower end of the first connecting plate 311 and is fixedly connected with the first connecting plate by bolts and nuts, so that the thickness of the joint of the bracket is increased, and the stability of the I-steel assembly 2 is improved.

In specific use, the first a-type stiffener angle steel 312 is installed in the middle of the first connecting plate 311, the thick steel backing plate 313 is installed at the bottom of the first connecting plate 311, and as shown in fig. 1 to 6, the steel backing plate 313 further strengthens the strength of the joint between the first i-steel 21 and the second i-steel 22.

The third joint assembly 33 includes: a second connection plate 331 and a second a-type stiffener angle 332; the second connecting plates 331 are symmetrically arranged at the joints of the upper ends of the two second I-steels 22 and the two ends of the third I-steel 23; the second a-shaped stiffening rib angle steel 332 is embedded in the middle of the second connecting plate 331 and is coaxially arranged at the joint of the upper ends of the two second I-beams 22 and the two ends of the third I-beam 23.

The first I-steel 21 and the second I-steel 22 are both arranged in the middle of the first A-shaped stiffening rib angle steel 312, and the third I-steel 23 is arranged in the middle of the second A-shaped stiffening rib angle steel 332; the first A-shaped stiffening rib angle steel 312 and the second A-shaped stiffening rib angle steel 332 on the two sides strengthen the strength of the first I-steel 21, the second I-steel 22 and the third I-steel 23, can prevent the I-steel assembly 2 from loosening after being installed in use, and improve the stability of the assembled first I-steel 21, second I-steel 22 and third I-steel 23.

Specifically, as shown in fig. 1, the inner side of the i-steel component 2 is provided with lining concrete 5, after a rock body is excavated into a hole, lining is needed to be carried out, the lining is mostly made of concrete or reinforced concrete, and the thickness is set to be proper according to the stress condition so as to protect surrounding rock, bear load and improve water passing capability.

The installation step comprises the following steps:

the first joint components 31 are arranged on two sides of the poured concrete back cover 1, the first I-steel 21 is arranged by the first joint components 31, the second I-steel 22 is arranged at one end of the first I-steel 21 by the second joint components 32, the third joint components 33 are arranged at the top ends of the second I-steel 22 after the installation is finished, and two ends of the third I-steel 23 and the third joint components 33 are arranged;

1. when the first joint assembly 31 is installed, as shown in fig. 1 and 2, the first a-type stiffening rib angle steel 312 is installed in the middle of the first connecting plate 311, the first i-steel 21 is clamped by the first connecting plate 311, the first i-steel 21 is installed, the first a-type stiffening rib angle steel 312 and the first connecting plate 311 clamp the first i-steel 21, so that the first i-steel 21 and the second i-steel 22 are tightly connected, the connection stability of the tunnel bracket is ensured, and a good supporting effect is achieved on the side wall and the top of the tunnel.

2. When the second joint assembly 32 is installed, the first A-shaped stiffening rib angle steel 312 is installed at the middle part of the first connecting plate 311, the steel base plate 313 is installed at the bottom of the first connecting plate 311, the steel base plate 313 strengthens the strength of the joint of the first I-steel 21 and the second I-steel 22, the first I-steel 21 and the second I-steel 22 are clamped at the middle part of the first connecting plate 311 of the second connecting assembly, looseness of the first I-steel 21 and the second I-steel 22 after installation is prevented, and the stability of the first I-steel 21 and the second I-steel 22 after assembly is improved.

3. When the third joint assembly 33 is installed, as shown in fig. 5 and 6, the second a-type stiffener angle steel 332 is installed in the middle of the second connecting plate 331, and the second a-type stiffener angle steel 332 and the second connecting plate 331 clamp the upper end of the second i-beam 22 and one end of the third i-beam 23 in the middle of the third connecting assembly 33, so as to prevent the second i-beam 22 from loosening after being installed with the third i-beam 23.

4. And installing the phi 25 lock foot anchor rod 4 and an anchor rod on the inner wall of the horseshoe-shaped tunnel, improving the compactness between the I-steel component 2 and the joint component 3 to prevent arch foot shrinkage and arch drop, and pouring lining concrete 5 to form a stable structure.

While the utility model has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the utility model and are intended to be within the scope of the utility model as claimed.

Claims

1. The utility model provides a horse-shoe shaped tunnel bow member supporting construction which characterized in that includes:

a concrete back cover (1);

the I-steel components (2) are fixedly connected to two ends of the concrete back cover (1) and extend along the concrete back cover (1);

the joint assemblies (3) are arranged in the middle of the I-steel assembly (2) at intervals; and

and the foot locking anchor rod (4) is fixedly connected with the I-steel component (2) and the joint component (3).

2. A horseshoe tunnel arch support structure according to claim 1, wherein said i-beam assembly (2) comprises:

the two first I-beams (21) are symmetrically arranged, and the lower ends of the two first I-beams (21) are fixedly connected to the two ends of the concrete back cover (1);

the second I-steel (22) is symmetrically provided with 2 second I-steels, and the lower ends of the two second I-steels (22) are fixedly connected to the upper ends of the first I-steel (21); and

the number of the third I-beams (23) is 1, and two ends of the third I-beams (23) are fixedly connected with the upper ends of the two second I-beams (22) respectively.

3. A horseshoe tunnel arch support according to claim 2, wherein said joint assembly (3) comprises:

the concrete sealing device comprises 2 first joint assemblies (31), wherein the first joint assemblies (31) are symmetrically arranged, and the first joint assemblies (31) are arranged at the connection part of the concrete sealing bottom (1) and the lower end of the first I-steel (21);

the second joint assemblies (32) are symmetrically arranged in 2, and the second joint assemblies (32) are arranged at the joint of the upper end of the first I-steel (21) and the lower end of the second I-steel (22); and

the third joint components (33) are symmetrically arranged in number, and the third joint components (33) are connected to the upper ends of the two second I-steels (22) and the two ends of the third I-steels (23).

4. A horseshoe tunnel arch support structure according to claim 3, wherein said first joint assembly (31) and second joint assembly (32) are identical in construction, said first joint assembly (31) comprising:

the first connecting plates (311) are symmetrically arranged at the joints of the lower ends of the two first I-beams (21) and the two ends of the concrete back cover (1);

the first A-type stiffening rib angle steel (312) is embedded in the middle of the connecting plate; and

and the steel backing plate (313) is arranged at the bottom of the first connecting plate (311) and is coaxially arranged at the lower end of the first I-steel (21) with the first connecting plate (311).

5. A horseshoe tunnel arch support structure according to claim 3, wherein said third joint assembly (33) comprises:

the second connecting plates (331) are symmetrically arranged at the joints of the upper ends of the two second I-steels (22) and the two ends of the third I-steel (23);

the second A-shaped stiffening rib angle steel (332) is embedded in the middle of the second connecting plate (331) and coaxially arranged with the second connecting plate (331) at the joint of the upper ends of the two second I-beams (22) and the two ends of the third I-beam (23).

6. The horseshoe tunnel arch support structure according to claim 4, wherein the number of the foot locking anchors (4) is 4, and the foot locking anchors are symmetrically welded above the connection of the first i-beam (21) and the first joint assembly (31) and above the connection of the second i-beam (22) and the first joint assembly (31).

7. A horseshoe tunnel arch support structure according to claim 6, wherein said first (311) and second (331) webs are no less than 15mm thick; the thickness of the steel backing plate (313) is not less than 15mm; the diameter of the foot locking anchor rod (4) is not smaller than 25mm.

8. The horseshoe tunnel arch support structure of claim 4, wherein the first and second i-beams (21, 22) are disposed in the middle of the first a-stiffener angle (312).

9. Horseshoe tunnel arch support structure according to claim 1, characterized in that the inner side of the i-steel assembly (2) is provided with lining concrete (5).

10. A horseshoe tunnel arch support structure according to claim 6, wherein the foot-locking anchor (4) is L-shaped.