Small-clear-distance large-section tunnel and pipe gallery co-construction structure

Abstract

The utility model discloses a small-clear-distance large-section tunnel and pipe gallery co-construction structure which comprises a secondary lining structure on the outer layer of a large-section tunnel, an inverted arch is horizontally arranged in the secondary lining structure, a comprehensive pipe gallery is arranged at the bottom of the inverted arch, the comprehensive pipe gallery comprises a comprehensive cabin and a high-voltage power cabin, and the high-voltage power cabin is arranged in the secondary lining structure. A motor vehicle lane, a bicycle lane and a sidewalk are arranged on the upper side of the inverted arch. An anchoring and shotcreting construction method is adopted for a large-section tunnel, one-way simultaneous tunneling is conducted on east and west lines, a double-side-wall pilot tunnel, CRD and CD construction method is adopted according to different geological conditions, and excavation is conducted in a mechanical and manual cooperation mode. The utility model aims to provide a small-clear-distance and large-section tunnel and pipe gallery co-construction structure for a large-span, small-clear-distance and large-section tunnel and a pipe gallery.

Description

Technical Field

[0001] The utility model relates to the technical field of municipal engineering construction, in particular to a small-clearance-large-section tunnel and pipe gallery co-construction structure. Background Art

[0002] With the continuous development of tunnel construction and urban underground space development, limited by land resources and construction conditions, the co-construction of tunnels with small clearance and large cross-section and pipe corridors is an inevitable choice. The construction safety of tunnel and pipe corridor co-construction projects and their impact on the surrounding environment have always been the key and difficult issues of concern to the engineering and academic circles. At the same time, urban tunnels and underground engineering construction are often located in strata with poor engineering properties such as weak surrounding rocks. How to ensure the safety of the project itself and reduce the impact on surrounding buildings is the top priority for ensuring the safe and rapid construction of the project. At present, domestic and foreign scholars and engineers have conducted research on the form of small clearance tunnels, but there are few studies on the co-construction of tunnels with three structural characteristics: large span, small clearance and asymmetry, and pipe corridors. The characteristics of weak surrounding rocks, tunnel bodies and tunnel openings under such working conditions deserve attention; research on construction parameter optimization is also mostly based on single-hole tunnels and symmetrical tunnels. There is still little optimization of construction parameters for asymmetric tunnels with large spans and small clearances, which cannot provide sufficient reference for engineering practice. Therefore, there is an urgent need for a co-construction structure of tunnels with small clearance and large cross-section and pipe corridors for large spans and small clearances. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies in the above-mentioned prior art and to provide a structure for co-building a tunnel and a pipe gallery with a small clear distance and a large cross-section for large spans and small clear distances.

[0004] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0005] A small-clearance, large-section tunnel and pipe gallery co-construction structure comprises a secondary lining structure on the outer layer of the large-section tunnel, wherein an invert is horizontally arranged inside the secondary lining structure, an integrated pipe gallery is arranged at the bottom of the invert, the integrated pipe gallery comprises an integrated cabin and a high-voltage power cabin, and a motor vehicle lane, a bicycle lane and a sidewalk are respectively arranged on the upper side of the invert.

[0006] Furthermore, the net distance between the east and west lines of the large-section tunnel is 5.45m.

[0007] Furthermore, the cross-sectional dimensions of the integrated cabin are 5.5m*3.7m, and the cross-sectional dimensions of the high-voltage power cabin are 2.8m*3.7m.

[0008] Compared with the prior art, the utility model has the following beneficial effects:

[0009] The utility model has accumulated numerical analysis results for the stability of surrounding rock, tunnel body, middle column and tunnel opening at each stage of tunnel excavation under different construction sequences and construction plans. At the same time, the structure of sidewalks and bicycle lanes in the tunnel is still rare in the national engineering field, which can provide a reference for similar projects. In addition, the co-construction structure of tunnels and pipe corridors has a significant effect, which not only overcomes the difficulties of today's municipal engineering being restricted by land resources and construction conditions, but also meets the functional use of water supply pipes, communication pipes, power pipes and recycled water pipes in the comprehensive pipe corridor. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of the utility model.

[0011] Reference numerals:

[0012] 1-large-section tunnel, 2-integrated pipeline gallery, 101-secondary lining structure, 102-inverted arch, 103-motor vehicle lane, 104-sidewalk, 105-bicycle lane, 201-integrated cabin, 202-high-voltage power cabin. DETAILED DESCRIPTION

[0013] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0014] like Figure 1 As shown, a small-clearance large-section tunnel and pipe gallery co-construction structure comprises a secondary lining structure 101 of the outer layer of the large-section tunnel 1, wherein an invert 102 is horizontally arranged in the secondary lining structure 101, and an integrated pipe gallery 2 is arranged at the bottom of the invert 102, wherein the integrated pipe gallery 2 comprises an integrated cabin 201 and a high-voltage power cabin 202, and a motor vehicle lane 103, a bicycle lane 105 and a sidewalk 104 are respectively arranged on the upper side of the invert 102.

[0015] The clearance between the east and west lines of the large-section tunnel 1 is 5.45m, which is a typical asymmetric double-track tunnel with a small clearance and large section. The cross-sectional dimensions of the integrated cabin 201 are 5.5m*3.7m, and the cross-sectional dimensions of the high-voltage power cabin 202 are 2.8m*3.7m.

[0016] The utility model rationally utilizes the self-stabilizing ability of the surrounding rock and reduces the disturbance of the surrounding rock caused by tunnel excavation as the principle. For the weak surrounding rock, enhanced advanced support or pre-support is adopted. The specific engineering measures use small guide tubes, locking anchor pipes, grouting, steel mesh, shotcrete and steel frames as the main construction support means, molded reinforced concrete is the secondary lining, and the construction is guided by on-site monitoring and measurement. The construction process steps are as follows:

[0017] (1) The large-section tunnel 1 adopts the anchor-spraying construction method, and is excavated simultaneously in one direction in the east and west directions. According to different geological conditions, double-side wall pilot pits, CRD, and CD construction methods are adopted, and the excavation method is a combination of mechanical and manual excavation. The initial support consists of system anchors, shotcrete, steel mesh, and steel frames. The support is applied immediately after the excavation face to control the deformation of the surrounding rock and reduce the exposure time of the surrounding rock.

[0018] (2) The tunnel of the integrated pipe gallery 2 and the west line are jointly constructed. The secondary lining structure 101 is formed in one step using an integral formwork trolley. The concrete mixing station supplies the materials in a centralized manner, the concrete mixer truck transports the materials, and the concrete delivery pump pumps the materials into the mold. The secondary lining structure 101 is strictly organized for construction in accordance with the principle of leading the invert 102 and casting the secondary lining structure 101 in one step. One trolley is put into each left and right tunnel. Before the construction of the secondary lining structure 101, the deformation of the surrounding rock and the initial support is required to be basically stable. The secondary concrete lining can only be applied when the measurement and monitoring data show that the displacement rate is significantly slowed down and the clearance change rate is less than 0.2mm / d. The construction of the secondary lining structure 101 is carried out before the construction of the top plate of the integrated pipe gallery 2 is completed. The invert 102 is constructed synchronously with the invert trestle and the heading face.

[0019] The two sections of the integrated pipe gallery 2 under the trestle are constructed simultaneously, each section is 9 meters long, which is consistent with the length of the second lining structure 101 trolley. When the second section of the integrated pipe gallery 2 is constructed, the temporary support in front is removed synchronously by 9 meters. After the construction of the second section of the integrated pipe gallery 2 is completed, the strength of the top plate of the first section of the integrated pipe gallery 2 reaches 14 days, and the trestle can be pushed 9 meters toward the heading direction, and the construction of the third section of the integrated pipe gallery 2 can continue. The second lining structure 101 trolley behind can move to the top plate of the first section of the integrated pipe gallery 2 to carry out the construction of the second lining structure 101. Among them, the inner diameter width of the second lining structure 101 of the west line tunnel is 17m, the height is 12.4m, the excavation width is 19.5m, and the excavation height is 15.25m; the inner diameter width of the second lining structure 101 of the east line tunnel is 17m, the height is 9m, the excavation width is 19.5m, and the excavation height is 11.45m.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A small-clearance, large-section tunnel and pipe gallery co-construction structure, characterized by: The invention comprises a secondary lining structure (101) on the outer layer of a large-section tunnel (1), an invert (102) being arranged horizontally in the secondary lining structure (101), a comprehensive pipe gallery (2) being arranged at the bottom of the invert (102), the comprehensive pipe gallery (2) comprising a comprehensive cabin (201) and a high-voltage power cabin (202), and a motor vehicle lane (103), a bicycle lane (105) and a sidewalk (104) being arranged on the upper side of the invert (102).

2. According to claim 1, a small-clearance-large-section tunnel and pipe gallery co-construction structure is characterized by: The net distance between the east and west lines of the large-section tunnel (1) is 5.45 m.

3. According to claim 1, a small-clearance-large-section tunnel and pipe gallery co-construction structure is characterized by: The cross-sectional dimensions of the integrated cabin (201) are 5.5m*3.7m, and the cross-sectional dimensions of the high-voltage power cabin (202) are 2.8m*3.7m.

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