CN115539092A - Joint bending-resistant tunnel steel arch frame - Google Patents

Abstract

The invention discloses a steel arch joint reinforcement structure for the primary support of a tunnel, which comprises a vault splicing unit, a side upper section splicing unit, a side middle section splicing unit and a side lower side splicing unit; the vault splicing unit includes a vault main body and the vault installation plate; the vault main body is a hollow arc-shaped tube; the side upper segment splicing unit includes a hollow splicing main body, an inserting portion, an upper mounting plate and a lower mounting plate fixed at the lower end of the splicing main body, one end of the inserting portion The insert is fixed in the splicing main body, and the vault splicing unit, the upper side splicing unit, the side middle splicing unit and the side lower splicing unit are sequentially inserted and fixed. The tunnel box-shaped steel arch frame of the present invention is further strengthened by the connection part on the joint, which not only improves the bending resistance and shear strength of the joint, but also improves the strength of the joint, so that the local splicing section of the tunnel box-shaped steel arch The strength is improved, and the integrity and support of the tunnel box steel arch frame are further improved.

Description

Tunnel steel arch frame with joint bending resistance

technical field

The invention relates to the technical field of tunnel construction, in particular to a tunnel steel arch frame whose joints resist bending.

Background technique

As a common primary support measure, steel arches are widely used in tunnel construction. In order to facilitate transportation and installation, a ring arch frame is often divided into several units, and the construction site is supported by bolts spliced into rings. Tunnel support structures are often subjected to bending and shearing at the same time. Although the bolts can provide a certain shear strength, their bending strength is not high. Therefore, this splicing method makes the connection weaker than other places, and the construction site is often It is the joints of the steel arch that yield first, leading to buckling deformation of the arch. In severe cases, the joints of the arch are broken, causing damage to the primary support or even collapse.

Contents of the invention

Aiming at the above-mentioned deficiencies in the prior art, a tunnel box-shaped steel arch frame with better bending resistance at joints, better strength and easy installation is provided.

In order to achieve the above-mentioned purpose of the invention, the technical solution adopted in the present invention is: comprising a vault splicing unit and side splicing units fixed at both ends of the vault splicing unit; The vault installation plate at the end; the main body of the vault is a hollow arc-shaped tube; the side splicing unit includes the side upper splicing unit, the side middle splicing unit and the side lower splicing unit connected in sequence; the side upper splicing unit, the side splicing unit The middle splicing unit has the same structure as the lower side splicing unit; the upper side splicing unit includes a hollow splicing main body, a splicing part installed on the upper end of the splicing main body, and an upper mounting plate fixed on the outside of the splicing part and fixed on the splicing part. The lower mounting plate at the lower end of the main body and one end of the splicing part are fixed in the splicing main body, and the vault splicing unit, the side upper splicing unit, the side middle splicing unit and the side lower splicing unit are sequentially inserted and fixed.

Further, the structure and size of the upper mounting plate, the lower mounting plate and the vault mounting plate are the same; Plate bolt hole; the rectangular opening is set in the middle of the rectangular plate main body, the shape of the rectangular opening is the same as the shape of the socket part, the rectangular opening and the external gap or interference fit of the socket part, the vault mounting plate and the upper mounting plate, the upper The mounting plate and the lower connecting plate are connected by several bolts and nuts.

Further, the vault splicing unit and the side upper section splicing unit are connected through the vault installation plate and the upper installation plate; the side upper section splicing unit and the side middle section splicing unit, the side middle section splicing unit and the side lower side The units are connected through the upper mounting plate and the lower connecting plate.

Further, there is a clearance or interference fit between the inserting part and the splicing main body, and between the inserting part and the vault main body.

Further, the length of the splicing part is a quarter of the length of the upper side splicing unit, and the splicing length of the splicing part and the splicing unit of the upper side is half of the length of the splicing part.

Further, several screws are arranged on the outside of the splicing body, and the several screws are located at the fixed section of the insertion part, and the insertion part is also provided with blind holes for matching with the screws.

Further, at least three mounting plate bolt holes are respectively provided on both sides of the rectangular plate body in the length direction, and the mounting plate bolt holes are distributed in a linear array.

Further, cross-sections of the dome splicing unit, the splicing main body and the insertion part are rectangular.

Further, the vault mounting plate is welded and fixed to the vault main body, and the upper mounting plate and the lower mounting plate are welded and fixed to the spliced main body.

The beneficial effects of the present invention are:

1. In the tunnel box-shaped steel arch frame of the present invention, each splicing unit is connected into an arch by connecting and combining the splicing part and the mounting plate, and the connecting plate and the splicing part are welded and reinforced. In this way, each splicing unit connection, so that when the box-shaped steel arch frame of the tunnel is subjected to the surrounding rock pressure, the shear force and bending moment at the junction of each spliced unit of the box-shaped steel arch frame of the tunnel will be jointly borne by the bolts and the joints, further improving the strength of the connection and improving Integrity and support of tunnel box-shaped steel arches.

2. The tunnel box-shaped steel arch frame of the present invention is further strengthened through the connection part at the joint, which not only improves the bending and shear strength of the joint, but also improves the strength of the joint, so that the tunnel box-shaped steel arch is partially spliced The strength of the section is improved, and the integrity and support of the tunnel box steel arch are further improved.

3. The present invention connects several sections of vault splicing units and side splicing units, between the connection between the vault splicing units and the side splicing units, and between the side splicing units of each section, through the insertion part and the main body part. At the same time, the connection of the side splicing unit and the mounting plate on each section of the side splicing unit are used for connection. The installation is convenient, the connection is fixed and reliable, and the installation is extremely convenient. The tunnel box-shaped steel arch frame is divided into several vault splicing units and side The design of the internal splicing unit makes the production of the tunnel box-shaped steel arch frame more modular and reduces the difficulty of production. It is not only convenient for transportation, but also convenient for assembly anytime and anywhere.

Description of drawings

Fig. 1 is a schematic diagram 1 of the overall appearance structure of the present invention;

Fig. 2 is the overall appearance structure schematic diagram II of the present invention;

Fig. 3 is the structural representation of each segment splicing unit among the present invention;

Fig. 4 is the structural representation of vault splicing unit among the present invention;

Fig. 5 is a schematic structural view of the side splicing unit in the present invention;

Fig. 6 is a structural schematic diagram of an end plate installed on a vault.

The symbols of the main components in the figure are explained as follows:

1. Vault splicing unit; 11. Vault main body; 12. Vault installation end plate; 121. Rectangular plate main body; 122. Rectangular opening; 123. Mounting plate bolt holes;

2. Side splicing unit; 21. Upper side splicing unit; 22. Side middle splicing unit; 23. Side lower splicing unit; 211. Splicing main body; 212. Inserting part; 213. Upper mounting plate; Lower the mounting plate.

detailed description

The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

The tunnel steel arch frame with joint bending resistance includes a vault splicing unit 1 and side splicing units fixed at both ends of the vault splicing unit 1; the vault splicing unit 1 includes a vault main body 11 and arches fixed at both ends of the vault main body 11. Top mounting plate 12; vault main body 11 is a hollow arc-shaped cylinder; side splicing unit 2 includes side upper segment splicing unit 21, side middle segment splicing unit 22 and side lower side splicing unit 23 connected in sequence; side upper segment splicing unit Unit 21, side middle section splicing unit 22 and side lower side splicing unit 23 have the same structure; side upper section splicing unit includes a hollow splicing main body 211, a splicing part 212 installed on the splicing main body 211 upper end, and a splicing part fixed on the splicing joint. The upper mounting plate 213 on the outside of the part 212 and the lower mounting plate 214 fixed on the lower end of the splicing body 211, one end of the inserting portion 212 is fixed in the splicing body 211, the vault splicing unit 1, the side upper section splicing unit 21, the side The splicing unit 22 at the middle part and the splicing unit 23 at the lower side are plugged and fixed in sequence. There is a gap or an interference fit between the insertion portion 212 and the splicing body 21 , and between the insertion portion 212 and the dome body 11 .

In this embodiment, the structure and size of the upper mounting plate 213, the lower mounting plate 214 and the vault mounting plate 12 are the same; the vault mounting plate 12 includes a rectangular plate main body 121 and a rectangular opening 122 arranged on the rectangular plate main body 121 and several mounting plate bolt holes 123 arranged on the rectangular plate main body 121; the rectangular opening 122 is arranged in the middle part of the rectangular plate main body 121, and the shape of the rectangular opening 122 is the same as that of the socket part 212, and the rectangular opening and the socket part 212 External clearance or interference fit, the length of the rectangular plate main body 121 is slightly larger than the cross-section of the box-shaped steel, and the width of a mounting plate bolt hole 123 is reserved on both sides of the width of the rectangular plate main body 121; the vault mounting plate 12 and the upper mounting plate 213 1. The upper mounting plate 213 and the lower connecting plate 214 are connected by several bolts and nuts, and the bolts are preferably M24 bolts. The upper mounting plate 213 is fixed on the outside of the splicing main body 211. When the socket part 212 is installed on the upper mounting plate 213, one side of the upper mounting plate 213 is welded and fixed with the upper mounting plate 213, and the upper mounting plate 213 and the splicing main body 211 are enlarged. connection strength.

In this embodiment, the vault splicing unit 1 and the upper side splicing unit 21 are connected through the vault mounting plate 12 and the upper mounting plate 213; between the upper side splicing unit 21 and the side middle splicing unit 22, The splicing unit 22 at the middle section and the splicing unit 23 at the lower side are connected through an upper mounting plate 213 and a lower connecting plate 214 . The vault splicing unit 1, the upper side splicing unit 21, the side middle splicing unit 22, and the side lower splicing unit 23 are connected and fixed through the installation book and the bolt sleeve to improve the stability of the steel arch joint and at the same time make It is more convenient to connect and fix the splicing units of each segment.

In this embodiment, the length of the splicing portion 212 is preferably a quarter of the length of the upper side splicing unit 21, and the splicing length of the splicing portion 212 and the splicing unit 21 of the upper side portion is preferably the length of the splicing portion 212. half of. The length of the splicing unit 21 of the upper section of the side, the splicing unit 22 of the middle section of the side and the splicing unit 23 of the lower side of the side are the same, and the length of the splicing part 212 is preferably 1/4th of the length of the splicing unit 21 of the upper section of the side. While the splicing unit plays a stable connection, the material of the splicing part 212 is saved. The splicing part 212 adopts a hollow rectangular metal beam or I-beam or C-shaped steel. The radians of the splicing unit 22 in the middle part and the splicing unit 23 in the lower part of the side part are compatible. The upper side splicing unit 21 , the side middle splicing unit 22 , and the side lower splicing unit 23 are connected to form a complete circular arc.

In this embodiment, several screws are provided on the outside of the splicing body 21 , and the several screws are located at the fixed section of the inserting portion 212 , and blind holes for matching with the screws are also provided on the inserting portion 212 . The role played by the screw is that when the splicing part 212 is fixed on the splicing main body 21, the splicing main body 21 and the splicing part 212 are pre-fixed by the screw, and a plurality of screws can be used to surround and fix the splicing part 212 to improve The connection stability between the plug-in portion 212 and the splicing main body 21; when the upper mounting plate 213 on the plug-in portion 212 is attached to the splicing main body 21, by welding the upper mounting plate 213 and the splicing main body 21, further The upper mounting plate 213 and the splicing main body 21 are fixed.

In this embodiment, at least three mounting plate bolt holes 123 are respectively provided on both sides of the rectangular plate main body 121 in the length direction, and the mounting plate bolt holes 123 are distributed in a linear array.

In this embodiment, cross-sections of the dome splicing unit 1 , the splicing body 21 and the insertion portion 212 are rectangular.

In this embodiment, the vault mounting plate 12 is welded and fixed to the vault main body 11 , and the upper mounting plate 213 and the lower mounting plate 214 are welded and fixed to the splicing main body 211 . When each side splicing unit is connected, after each splicing part 212 is plugged and fixed with the splicing main body 21, the upper mounting plate 213 and the lower mounting plate 214 should be ensured to be as parallel or fit as possible to facilitate further connection and fixation with bolt sleeves The upper mounting plate 213 and the lower mounting plate 214, so the splicing units on both sides of the side splicing unit and the vault splicing unit should have the same inclination angle, and the specific inclination angle is determined according to the actual construction. The length of the cross-sectional area of the upper side splicing unit 21, the side middle splicing unit 22 and the side lower splicing unit 23 is preferably 220mm, the width is preferably 110mm, and the wall thickness is preferably 12mm.

Working principle and its process: when installing, first weld the upper mounting plate 213 outside the socket part 212 to the middle, the lower mounting plate 214 is welded and fixed to the bottom of the splicing main body 21, and the vault mounting plate 12 is welded and fixed to the vault main body 11 Then the upper mounting plate 213 and the splicing main body 21 are strengthened and welded; then the side lower side splicing unit 23, the side middle segment splicing unit 22, and the side upper segment splicing unit 21 are inserted and fixed in sequence, through the upper mounting plate 213, the lower mounting plate 214 is connected with the bolt cover; finally, the assembled two groups of side splicing units are plugged and fixed on the two ends of the vault splicing unit 1, through the vault mounting plate 12, the upper mounting plate 213 and the bolt cover to connect.

Claims (9)

1. The joint bending-resistant tunnel steel arch center is characterized by comprising a vault splicing unit (1) and side splicing units fixed at two ends of the vault splicing unit (1);

the vault splicing unit (1) comprises a vault main body (11) and vault mounting plates (12) fixed at two ends of the vault main body (11); the vault main body (11) is a hollow arc-shaped cylinder;

the side splicing unit (2) comprises a side upper section splicing unit (21), a side middle section splicing unit (22) and a side lower side splicing unit (23) which are sequentially connected; the side upper section splicing unit (21), the side middle section splicing unit (22) and the side lower side splicing unit (23) have the same structure;

the side upper section splicing unit comprises a hollow splicing main body (211), a splicing part (212) arranged at the upper end of the splicing main body (211), an upper mounting plate (213) fixed on the outer side of the splicing part (212) and a lower mounting plate (214) fixed at the lower end of the splicing main body (211), one end of the splicing part (212) is embedded and sleeved in the splicing main body (211), and the vault splicing unit (1), the side upper section splicing unit (21), the side middle section splicing unit (22) and the side lower side splicing unit (23) are sequentially spliced and fixed.

2. The joint moment-resistant tunnel steel arch according to claim 1, characterized in that said upper mounting plate (213), said lower mounting plate (214) and said dome mounting plate (12) are of the same structure and size; the vault mounting plate (12) comprises a rectangular plate main body (121), a rectangular opening (122) arranged on the rectangular plate main body (121) and a plurality of mounting plate bolt holes (123) arranged on the rectangular plate main body (121); the rectangular opening (122) is arranged in the middle of the rectangular plate main body (121), the shape of the rectangular opening (122) is the same as that of the insertion part (212), the rectangular opening is in clearance or interference fit with the outside of the insertion part (212), and the vault mounting plate (12) is connected with the upper mounting plate (213), the upper mounting plate (213) and the lower connecting plate (214) through a plurality of bolts and nuts.

3. The bend-resistant tunnel steel arch of claim 1, wherein the crown splice unit (1) and the side upper segment splice unit (21) are connected by a crown mounting plate (12) and an upper mounting plate (213); the side upper section splicing unit (21) and the side middle section splicing unit (22) are connected through an upper mounting plate (213) and a lower connecting plate (214) between the side middle section splicing unit (22) and the side lower side splicing unit (23).

4. The joint moment-resistant tunnel steel arch according to claim 1, wherein a clearance or interference fit is provided between the spigot portion (212) and the splice body (21), and between the spigot portion (212) and the dome body (11).

5. The steel arch for a tunnel with a joint bending resistance according to claim 1, wherein the length of the insertion portion (212) is one quarter of the length of the side upper segment splicing unit (21), and the insertion length of the insertion portion (212) and the side upper segment splicing unit (21) is one half of the length of the insertion portion (212).

6. The steel arch for connecting bending resistance of tunnel according to claim 1, wherein a plurality of screws are arranged outside the splicing main body (21), a plurality of screws are arranged on the fixing section of the insertion part (212), and blind holes matched with the screws are further arranged on the insertion part (212).

7. The joint moment resistant tunnel steel arch according to claim 2, wherein said rectangular plate body (121) is provided with at least three mounting plate bolt holes (123) on both sides in the length direction, respectively, said mounting plate bolt holes (123) being arranged in a linear array.

8. Joint moment-resistant tunnel steel arch according to claim 1, characterised in that the cross-section of the dome-splice unit (1), the splice body (21) and the spigot (212) is rectangular.

9. The bend-resistant tunnel steel arch according to claim 1, wherein the arch mounting plate (12) is welded to the arch body (11), and the upper mounting plate (213), the lower mounting plate (214) are welded to the splice body (211).

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