Tunnel portal engineering guide sleeve arch supporting structure

Abstract

The utility model relates to the technical field of tunnel construction, and discloses a tunnel portal engineering guide sleeve arch supporting structure which comprises sleeve arch foundations, sleeve arch frames and inner supporting assemblies, the sleeve arch foundations are symmetrically arranged on the two sides of a tunnel portal, the sleeve arch frames are fixedly installed on the sleeve arch foundations, the inner supporting assemblies are arranged on the inner sides of the sleeve arch frames, and the sleeve arch foundations are fixedly installed on the sleeve arch foundations. By the adoption of the guide sleeve arch supporting structure, the structure is more stable and not prone to deformation when bearing a large load or experiencing a complex stress state.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a guiding sleeve arch support structure for tunnel portal engineering. Background Technique

[0002] The guiding sleeve arch support structure in tunnel portal engineering is an important support technology, which is mainly used to guide the tunnel excavation direction and provide initial support to ensure the safety of tunnel construction. The guiding sleeve arch is usually cast with concrete, and a steel frame or other support structures are arranged inside to enhance its overall stability. The existing sleeve arch frame of the guiding sleeve arch support structure is mainly designed with a single-layer steel pipe. This method is simple and fast to use, but when bearing large loads or experiencing complex stress states, the structural stability is insufficient and it is easy to deform. Content of the Utility Model

[0003] The purpose of the utility model is to provide a guiding sleeve arch support structure for tunnel portal engineering, so as to solve the problem that the existing guiding sleeve arch support structure has insufficient structural stability and is easy to deform when bearing large loads or experiencing complex stress states as mentioned in the above background technique.

[0004] To achieve the above purpose, the utility model provides the following technical solutions:

[0005] A guiding sleeve arch support structure for tunnel portal engineering, including a sleeve arch foundation, a sleeve arch frame and an internal support assembly. The sleeve arch foundations are symmetrically arranged on both sides of the tunnel portal. The sleeve arch frame is fixedly installed on the sleeve arch foundations. An internal support assembly is arranged inside the sleeve arch frame. The sleeve arch frame includes a steel arch frame arranged circumferentially along the upper part of the tunnel portal. The steel arch frame is composed of an inner frame body, an outer frame body and several pairs of tie rods between the inner frame body and the outer frame body. The several pairs of tie rods are horizontally and evenly fixedly connected between the inner frame body and the outer frame body, so as to form a relative tension between the inner frame body and the outer frame body. The internal support assembly includes at least two layers of support bottoms. The top support bottom is a whole. Except for the top support bottom, the remaining support bottoms are symmetrically arranged left and right and are provided with side plates on the side close to the inside of the tunnel. The side plates and the remaining support bottoms except the top support bottom enclose. A plurality of vertical standpipes are evenly arranged on each support bottom. The other ends of the standpipes abut against the inner frame body. A plurality of horizontal crossbars are evenly arranged between the standpipes. One end of each crossbar abuts against the side plate, and the other end abuts against the inner frame body.

[0006] Furthermore, the internal support assembly further includes a top support and a bottom support. The connecting end of the top support is columnar, and the other end is concave groove-shaped; the connecting end of the bottom support is columnar, and the other end is rectangular.

[0007] Furthermore, a top support and a bottom support are respectively arranged at both ends of each vertical rod. The connecting end of the top support is inserted into the vertical rod, and the other end abuts against the inner frame body; the connecting end of the bottom support is inserted into the vertical rod, and the other end abuts against the supporting bottom surface.

[0008] Furthermore, for the cross bars between the side plates and the inner frame body, top supports and bottom supports are arranged at intervals at both ends thereof. The connecting end of the top support is inserted into the cross bar, and the other end abuts against the inner frame body; the connecting end of the bottom support is inserted into the cross bar, and the other end abuts against the side plate.

[0009] Furthermore, the inner support assembly further includes a plurality of diagonal rods that are obliquely and cross - arranged on the vertical rods and cross bars.

[0010] Furthermore, the vertical rods and the cross bars are connected by cross buckles.

[0011] Furthermore, the diagonal rods and the vertical rods, cross bars are connected by one - word buckles.

[0012] Furthermore, the tie rods are fixedly connected by welding between the inner frame body and the outer frame body.

[0013] Furthermore, the arch - sleeve foundation is formed by concrete pouring, has a square cross - section, is connected to the arch - sleeve frame at the upper part, and is connected to the inner support assembly at the inner side.

[0014] Furthermore, the supporting bottom surface of the inner support assembly has three layers, and the side plates and the supporting bottom surfaces except the top - layer supporting bottom surface enclose to form a stepped shape.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0016] 1. The guiding arch - sleeve adopts a structure in which an inner frame body, an outer frame body and tie rods are used for tensioning between the two. First of all, the double - frame body structure has greater torsion - resistance and bending - resistance capabilities compared with the single - frame body. In fact, the connection method of using tie rods between the double - frame bodies forms a whole. Such a structure performs more excellently when bearing external loads, can effectively resist uneven settlement and geological changes that may be encountered in tunnel construction, and provides high stability.

[0017] 2. At least two layers of supporting bottom surfaces are arranged inside the arch - sleeve frame, and the cross bars, vertical rods and diagonal rods that are connected to each other are provided. In this way, the structure of the inner support assembly is a full - hall support frame method. This structure is multi - point support, easy to control settlement, has a small amount of bracket rebound during tensioning, is beneficial to the stability of the arch - sleeve frame, and the linear shape of the arch - sleeve frame is easy to control.

[0018] 3. At the same time, top supports and bottom supports are arranged on the vertical rods and cross bars, which can adjust the support structure more precisely and also have a buffering effect.

[0019] In summary, compared with the prior art, the utility model has a more stable structure and is not easily deformed when bearing large loads or experiencing complex stress states. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 is a schematic diagram of the partial structure of the utility model;

[0022] In the figure: 100 - arch sleeve foundation, 200 - arch sleeve frame, 210 - outer frame body, 220 - tie rod, 230 - inner frame body, 240 - outer side wooden board, 300 - inner support assembly, 310 - support bottom surface, 320 - side plate, 330 - vertical pole, 340 - horizontal bar, 350 - inclined bar, 360 - bottom support, 370 - top support, 400 - reserved core soil. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0024] Such as Figure 1As shown in the figure, a guiding sleeve arch support structure for a tunnel portal project includes a sleeve arch foundation 100, a sleeve arch frame 200, and an internal support assembly 300. The sleeve arch foundation 100 is symmetrically arranged on both sides of the tunnel portal. The sleeve arch frame 200 is fixed on the sleeve arch foundation 100. An internal support assembly 300 is arranged inside the sleeve arch frame 200. The sleeve arch frame 200 includes a steel arch frame arranged circumferentially along the upper part of the tunnel portal. The steel arch frame is composed of an inner frame body 230, an outer frame body 210, and several pairs of tie rods 220 between the inner frame body 230 and the outer frame body 210. The several pairs of tie rods 220 are horizontally and evenly fixedly connected between the inner frame body 230 and the outer frame body 210, so as to form a relative tensile force between the inner frame body 230 and the outer frame body 210. The internal support assembly 300 includes at least two layers of support bottom surfaces 310. The top support bottom surface 310 is integral. Except for the top support bottom surface 310, the remaining support bottom surfaces 310 are symmetrically arranged left and right and are provided with side plates 320 on the side close to the inside of the tunnel. The side plates 320 surround the remaining support bottom surfaces 310 except for the top support bottom surface 310. Several vertical upright rods 330 are evenly arranged on each support bottom surface 310. The other ends of the upright rods 330 are abutted against the inner frame body 230. Several horizontal cross rods 340 are evenly arranged between the several upright rods 330. One end of the cross rod 340 is abutted against the side plate 320, and the other end is abutted against the inner frame body 230.

[0025] As Figure 2 shown, the internal support assembly 300 further includes a top bracket 370 and a bottom bracket 360. The connecting end of the top bracket 370 is columnar, and the other end is in the shape of a concave groove. The connecting end of the bottom bracket 360 is columnar, and the other end is rectangular.

[0026] As Figure 2 shown, one top bracket 370 and one bottom bracket 360 are respectively arranged at both ends of each upright rod 330. The connecting end of the top bracket 370 is inserted into the upright rod 330, and the other end is abutted against the inner frame body 230. The connecting end of the bottom bracket 360 is inserted into the upright rod 330, and the other end is abutted against the support bottom surface 310.

[0027] As Figure 2 shown, for the cross rod 340 between the side plate 320 and the inner frame body 230, the top bracket 370 and the bottom bracket 360 are arranged at intervals at both ends thereof. The connecting end of the top bracket 370 is inserted into the cross rod 340, and the other end is abutted against the inner frame body 230. The connecting end of the bottom bracket 360 is inserted into the cross rod 340, and the other end is abutted against the side plate 320.

[0028] As Figure 1 shown, the internal support assembly 300 further includes several diagonal rods 350 that are obliquely and crosswise arranged on the upright rods 330 and the cross rods 340.

[0029] During actual construction, the vertical pole 330 and the cross bar 340 are connected by a cross buckle.

[0030] During actual construction, the inclined pole 350 and the vertical pole 330, cross bar 340 are connected by a straight buckle.

[0031] During actual construction, the tie rod 220 is fixedly connected by welding between the inner framework and the outer framework 210.

[0032] During actual construction, the arch socket foundation 100 is formed by concrete pouring, with a square cross-section, connected to the arch socket frame 200 at the upper part and connected to the inner support assembly 300 at the inner side.

[0033] During actual construction, the supporting bottom surface 310 of the inner support assembly has three layers, and the side plate 320 and the remaining supporting bottom surfaces 310 except the top layer of the supporting bottom surface 310 enclose to form a stepped shape.

[0034] During actual construction, the supporting bottom surface 310 is made of concrete with a thickness of 10 cm.

[0035] During actual construction, a guiding arch socket and a core soil 400 are reserved inside the arch, and the supporting bottom surface 310 is arranged on the reserved core soil 400.

[0036] During actual construction, the guiding arch socket is formed by pouring in two times. The height of the first pouring is the part of the arch socket foundation 100, and the height of the second pouring is the part above the arch socket foundation 100.

[0037] During actual construction, the guiding arch socket is arranged at the entrances and exits of the tunnel and is constructed by the support in-situ casting method. The construction process of the guiding arch socket support structure is as follows:

[0038] The first step, guiding arch socket and in-arch excavation: Excavation is carried out according to the dimensions and plane positions of the guiding arch socket and the core soil 400 reserved inside the arch. After excavation, a foundation bearing capacity test is carried out on the foundation of the guiding arch socket. The design requirement is not less than 150 kPa. The platform of the core soil 400 reserved inside the arch serves as the erection platform of the inner support assembly 300. After excavation, the foundation bearing capacity of the platform of the core soil 400 reserved inside the arch is detected. The design requirement is not less than 183 kPa. After the foundation bearing capacity of the platform of the core soil 400 reserved inside the arch meets the requirements, a 10 cm thick concrete supporting bottom surface 310 is poured.

[0039] Step 2: Install the inner support assembly 300: first, place the bottom bracket 360 on the support bottom surface 310 according to the design marking line, then install the vertical poles 330 from both sides of the inner frame 230 to the middle and simultaneously install the cross bar 340 from bottom to top, and connect the vertical poles 330 and the cross bar 340 through a cross buckle; then, install the diagonal rod 350 on the vertical poles 330 and the cross bar 340 through a straight buckle, and the diagonal rod 350 is installed in the form of a scissors brace; finally, adjust the top bracket 370 of the vertical poles 330 and the cross bar 340 to make them conflict with the inner frame 230;

[0040] The third step is to install the arch frame 200: install the outer wooden board 240 of the guide arch by setting internal supporting steel bars. A certain material discharge port needs to be reserved during the installation process. Then install the guide arch ring to the inner frame and the outer frame 210, with a spacing of 0.5m along the route direction; finally, the inner frame and the outer frame 210 are pulled together by the tension rods 220, and the spacing along the route direction and vertically is 0.5m.

[0041] Step 4: Installation of the guide sleeve arch end formwork: The exposed end formwork of the guide sleeve arch is made of thick bamboo plywood + square wood; it is reinforced with tie steel bars, which are welded to I-beams and anchored in the upward slope; the formwork installation is required to be controlled on the same vertical plane.

[0042] Step 5. Concrete pouring: Pour symmetrically on the left and right sides. The first pouring height is 100% of the arch foundation, and the second pouring height is above 100% of the arch foundation.

[0043] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A guide sleeve arch support structure for a tunnel portal engineering, characterized in that: It includes an arch foundation, an arch frame and an inner support assembly, the arch foundation is symmetrically arranged on both sides of the tunnel opening, the arch frame is fixedly installed on the arch foundation, the inner side of the arch frame is provided with an inner support assembly, the arch frame includes a steel arch frame arranged in a circumferential direction along the upper part of the tunnel opening, the steel arch frame is composed of an inner frame body, an outer frame body and several pairs of tie rods between the inner frame body and the outer frame body, several pairs of tie rods are horizontally and evenly fixedly connected between the inner frame body and the outer frame body, so that relative tension is formed between the inner frame body and the outer frame body; the inner support assembly The support assembly includes at least two layers of supporting bottom surfaces, the top layer of the supporting bottom surface is a whole, and the remaining supporting bottom surfaces except the top layer are symmetrically arranged on the left and right and are provided with side panels on the side close to the tunnel, and the side panels are surrounded by the remaining supporting bottom surfaces except the top layer of the supporting bottom surface, and a number of vertical vertical poles are evenly arranged on each of the supporting bottom surfaces, and the other end of the vertical poles abuts against the inner frame, and a number of horizontal cross bars are evenly arranged between the vertical poles, one end of the cross bar abuts against the side panel, and the other end thereof abuts against the inner frame.

2. The guide sleeve arch support structure for tunnel portal engineering according to claim 1 is characterized in that: The inner support assembly also includes a top support and a bottom support, wherein the top support has a columnar connection end and a concave groove connection end; the bottom support has a columnar connection end and a rectangular connection end.

3. The guide sleeve arch support structure for tunnel portal engineering according to claim 2 is characterized in that: A top support and a bottom support are respectively arranged at the two ends of each vertical pole, the top support connection end is inserted into the vertical pole, and the other end abuts against the inner frame; the bottom support connection end is inserted into the vertical pole, and the other end abuts against the support bottom surface.

4. The guide sleeve arch support structure for tunnel portal engineering according to claim 2 is characterized in that: The cross bar between the side plate and the inner frame has the top support and the bottom support spaced apart at both ends, the top support connecting end is inserted into the cross bar, and the other end abuts against the inner frame; the bottom support connecting end is inserted into the cross bar, and the other end abuts against the side plate.

5. The guide sleeve arch support structure for tunnel portal engineering according to claim 1 is characterized in that: The inner support assembly also includes a plurality of oblique rods obliquely and cross-arranged on the vertical rods and the horizontal rods.

6. The guide sleeve arch support structure for tunnel portal engineering according to claim 1, characterized in that: The vertical rod and the horizontal rod are connected via a cross buckle.

7. The guide sleeve arch support structure for tunnel portal engineering according to claim 5, characterized in that: The oblique rod is connected with the vertical rod and the horizontal rod through a straight buckle.

8. The guide sleeve arch support structure for tunnel portal engineering according to claim 1 is characterized in that: The tie rods are fixedly connected between the inner frame and the outer frame by welding.

9. The guide sleeve arch support structure for tunnel portal engineering according to claim 1, characterized in that: The sleeve arch foundation is cast by concrete, has a square cross section, is connected to the sleeve arch frame at the top, and is connected to the inner support assembly at the inside.

10. The guide sleeve arch support structure for tunnel portal engineering according to claim 1, characterized in that: The supporting bottom surface of the inner supporting assembly is three-layered, and the side panels and the supporting bottom surfaces except the top layer are combined to form a stepped shape.

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