CN-224214201-U - Main tunnel intersection excavation supporting portal frame of large-section hydraulic tunnel

Abstract

The utility model discloses a large-section hydraulic tunnel main-support intersection excavation supporting portal in the technical field of tunnel construction, which comprises a reinforcing portal and connecting pieces, wherein the reinforcing portal comprises an outer portal and an inner portal, semicircular portal beams are fixedly connected between the top ends of the inner portal beams, portal beams are fixedly connected between the tops of the outer portal beams, the inner sides of the semicircular portal Liang Yumen frame beams are connected, straight-line reinforcing ribs are fixedly arranged between the outer portal beams and the inner portal beams, multi-section inclined reinforcing ribs are fixedly arranged between the semicircular portal Liang Yumen frame beams, bevel supporting pieces are commonly connected between the tops of the inclined reinforcing ribs, and the bevel supporting pieces are fixedly connected between the outer portal beams and the portal beams.

Inventors

• YANG XIAOSHAN
• WANG MING
• SHUAI WEI
• HUANG NING
• ZHANG LIBIN

Assignees

• 浙江省第一水电建设集团股份有限公司

Dates

Publication Date

20260508

Application Date

20250701

Claims (6)

1. 1. The large-section hydraulic tunnel main-tunnel intersection excavation supporting portal frame comprises a reinforcing portal frame and connecting pieces and is characterized in that the reinforcing portal frame comprises an outer portal beam (1) and an inner portal beam (2), a semicircular portal beam (3) is fixedly connected between the top ends of the inner portal beam (2), and a portal beam (4) is fixedly connected between the top ends of the outer portal beam (1); The novel door frame is characterized in that the semicircular door beam (3) is connected with the inner side of the door frame cross beam (4), straight-line reinforcing ribs (5) are fixedly arranged between the outer door beam (1) and the inner door beam (2), a plurality of sections of inclined reinforcing ribs (6) are fixedly arranged between the semicircular door beam (3) and the door frame cross beam (4), bevel angle supporting pieces (7) are commonly connected between the tops of the inclined reinforcing ribs (6), and the bevel angle supporting pieces (7) are fixedly connected between the outer door beam (1) and the door frame cross beam (4) at the same time.
2. 2. The large-section hydraulic tunnel main-tunnel intersection excavation supporting portal frame is characterized in that the sections of the inner door beam (2) and the outer door beam (1) are I-shaped, and the fixed connection is welding.
3. 3. A large section hydraulic tunnel main tunnel intersection excavation supporting gantry according to claim 1, characterized in that the gantry beam (4) cross section area is larger than the outer gantry beam (1) and inner gantry beam (2) cross section area.
4. 4. The large-section hydraulic tunnel main support intersection excavation supporting portal frame of claim 1 is characterized in that the connecting piece comprises a fixed bottom plate (8) and a connecting supporting plate (9), a positioning wedge block (10) is fixedly arranged on the inner side of the connecting supporting plate (9), and the fixed bottom plate (8) is fixedly installed in a tunnel through an anchor rod.
5. 5. The large-section hydraulic tunnel main-tunnel intersection excavation supporting portal frame of claim 4 is characterized in that an implantation sleeve (11) is fixedly connected inside the fixed bottom plate (8), an inner screw (12) is rotatably arranged in the middle of the connecting supporting plate (9), and the inner screw (12) is located in the middle of the positioning wedge block (10) and is in threaded fit with the implantation sleeve (11).
6. 6. A large section hydraulic tunnel main tunnel intersection excavation supporting portal as claimed in claim 1, wherein the reinforcing portal is installed at the supporting hole for supporting the supporting hole and connecting with the main hole supporting piece.

Description

Main tunnel intersection excavation supporting portal frame of large-section hydraulic tunnel Technical Field The utility model relates to the technical field of tunnel construction, in particular to a large-section hydraulic tunnel main-tunnel intersection excavation supporting portal frame. Background At present, the large-section hydraulic tunnel is commonly used for a diversion system of a large hydropower station or an urban flood discharge tunnel in hydraulic engineering. For the large-section hydraulic tunnel, the excavation supporting stage is the stage with the largest construction risk, and the main-tunnel intersection is one of the parts with the highest risk in the large-section tunnel excavation supporting stage, and the main risk point is that stress concentration is that the intersection part forms three-dimensional stress redistribution due to abrupt change of the section, and the stress concentration of surrounding rocks at the junction of the main tunnel and the supporting tunnel possibly causes expansion or local collapse of the plastic region of the surrounding rocks. The entry of the support hole and the height difference between the support hole and the main hole enable the main hole at the joint to be incapable of being applied to a complete steel frame support, so that the support strength at the entrance of the support hole is required to be improved, the support hole can bear the stress at the intersection and can be connected with the main hole support, the support hole entrance support in the prior art is not unified, and is mostly reinforced on site, so that the reinforcement effect and the support effect are not ideal, and the standard construction is difficult. Based on the above, the utility model designs a large-section hydraulic tunnel main-tunnel intersection excavation supporting portal frame to solve the problems. Disclosure of utility model The utility model aims to provide a large-section hydraulic tunnel main-tunnel intersection excavation supporting portal frame so as to solve the problems that the supporting tunnel entrance support provided in the background art is not unified standard, is mostly reinforced on site, further causes unsatisfactory reinforcing effect and supporting effect, and is difficult to construct in standard mode. The technical scheme includes that the door comprises a reinforced door frame and connecting pieces, wherein the reinforced door frame comprises an outer door beam and an inner door beam, semicircular door beams are fixedly connected between the top ends of the inner door beams, and door frame cross beams are fixedly connected between the top ends of the outer door beams; The inner sides of the semi-circular door Liang Yumen frame beams are connected, straight-line reinforcing ribs are fixedly arranged between the outer door beam and the inner door beam, a plurality of sections of inclined reinforcing ribs are fixedly arranged between the semi-circular door Liang Yumen frame beams, bevel angle supporting pieces are commonly connected between the tops of the inclined reinforcing ribs, and the bevel angle supporting pieces are fixedly connected between the outer door beam and the door frame beams. As a further scheme of the utility model, the sections of the inner door beam and the outer door beam are I-shaped, and the fixed connection is welding. As a further aspect of the utility model, the portal beam cross-sectional area is greater than the outer and inner portal beam cross-sectional areas. As a further scheme of the utility model, the connecting piece comprises a fixed bottom plate and a connecting supporting plate, wherein a positioning wedge block is fixedly arranged on the inner side of the connecting supporting plate, and the fixed bottom plate is fixedly arranged in the tunnel through an anchor rod. As a further scheme of the utility model, the inside of the fixed bottom plate is fixedly connected with an implantation sleeve, the middle part of the connection supporting plate is rotatably provided with an inner screw rod, and the inner screw rod is positioned in the middle part of the positioning wedge block and is in threaded fit with the implantation sleeve. As a further aspect of the present utility model, the reinforcement portal is installed at the support hole for supporting the support hole and connecting the main hole supporting member. Compared with the prior art, the utility model has the beneficial effects that: The outer door beam can be fixedly connected with the main hole support, so that the height difference between the main hole and the support hole can be made up, the main hole support can be effectively and fixedly connected with the door frame cross beam, the inner door beam and the semicircular door beam are connected with the support hole support in a transitional manner, and meanwhile, the outer door beam and the inner door beam are connected through the linear reinforcing ribs, so that the support at the