Water tunnel intersection excavation structure

Abstract

The utility model provides a water conveyance tunnel intersection excavation structure, which belongs to the technical field of water diversion tunnel engineering and comprises an adit general section, an adit lofting transition section and an intersection section which are connected with one another. The excavation section type of the branch hole lofting transition section is transited from the branch hole section to the main hole section; the intersection section comprises a branch hole rightward expanding excavation section, a branch hole leftward expanding excavation section, an intersection main hole section and an intersection triangular area; the tunnel axis of the intersection section is a leftward arc axis and a rightward arc axis, and an intersection triangular area is formed among the leftward arc axis, the rightward arc axis and the tunnel axis of the main hole. The excavation structure disclosed by the utility model solves the problem of smooth connection of tunnel intersections with different sizes and section types; and the section type of the intersection is simplified, the standardization and standardization of the connection structure design of the tunnel intersection are promoted, and meanwhile, the progress of site construction is promoted.

Description

Technical Field

[0001] The utility model belongs to the technical field of diversion and water conveyance tunnel engineering, and more specifically, relates to an excavation structure at the intersection of a water conveyance tunnel. Background Technique

[0002] With the implementation of a series of large-scale diversion and water conveyance projects such as the Middle Route Project of Yunnan Water Diversion and the Project of Drawing the Yangtze River Water to Supplement the Han River, the construction of long-distance water conveyance tunnels in China has entered a new development stage. During the construction of long-distance water conveyance tunnels, a certain number of construction access tunnels are often arranged to accelerate the construction progress of the water conveyance tunnels, and at the same time, it is beneficial to the ventilation and mucking of the working face. The design and support of the intersection of the construction access tunnel and the main water conveyance tunnel are related to the structural safety and are the key and difficult points of the design work.

[0003] The existing tunnel design specifications do not have clear regulations on the excavation shape and support (initial) of the intersection of the main tunnel and the access tunnel of the water conveyance tunnel. At the same time, due to the different excavation cross-section shapes and sizes of the main water conveyance tunnel and the access tunnel, how to connect the access tunnel and the main tunnel, and how to arrange the structural form and support of the intersection are quite challenging. These problems are not conducive to the standardization and standardization of the structural design of the intersection of the water conveyance tunnel, nor are they conducive to on-site construction. Content of the Utility Model

[0004] The purpose of the utility model is to provide an excavation structure at the intersection of a water conveyance tunnel to solve at least one of the above problems. This structure connects the access tunnel and the main tunnel through a transition section of access tunnel lofting and an intersection section, which is conducive to the standardization and standardization of the connection structure design of the intersections of tunnels with different sizes and cross-section types, and at the same time helps to improve the on-site construction progress.

[0005] To achieve the above purpose, the utility model provides an excavation structure at the intersection of a water conveyance tunnel, including: a general section of the access tunnel, a transition section of access tunnel lofting, and an intersection section that are connected to each other;

[0006] The excavation cross-section type of the transition section of access tunnel lofting transitions from the access tunnel cross-section to the main tunnel cross-section;

[0007] The intersection section includes an excavation section where the access tunnel expands to the right, an excavation section where the access tunnel expands to the left, a main tunnel section at the intersection, and an intersection triangular area; the tunnel axis of the intersection section is a left circular arc axis and a right circular arc axis, and the intersection triangular area is formed between the left circular arc axis, the right circular arc axis and the tunnel axis of the main tunnel.

[0008] Further, both the left circular arc axis and the right circular arc axis are tangent to the tunnel axis of the general section of the access tunnel and the tunnel axis of the main tunnel.

[0009] Further, the transition section of access tunnel lofting is formed by lofting and gradually changing from the access tunnel cross-section to the main tunnel cross-section.

[0010] Further, the excavation cross-sections of the side-excavated extension section of the branch tunnel, the side-excavated extension section of the branch tunnel towards the left, and the main tunnel section at the intersection are all the main tunnel cross-section.

[0011] Further, the cross-section of the branch tunnel and the cross-section of the main tunnel can be any one of an arch shape, an oval shape, a circular shape, and a rectangular shape.

[0012] Further, a plurality of steel arch frames for the main tunnel section at the intersection and three-piece steel arch frames for the intersection are provided in the intersection section, and the three-piece steel arch frames for the intersection are perpendicularly arranged with respect to the plurality of steel arch frames for the main tunnel section at the intersection.

[0013] Further, a plurality of steel arch frames for the gradually changing section of the branch tunnel lofting are provided in the gradually changing section of the branch tunnel lofting, and the plurality of steel arch frames for the gradually changing section of the branch tunnel lofting are perpendicularly arranged with respect to the tunnel axis of the general section of the branch tunnel.

[0014] Further, a plurality of steel arch frames for the branch tunnel intersection section are also provided in the intersection section. The adjacent steel arch frames for the gradually changing section of the branch tunnel lofting and the steel arch frames for the branch tunnel intersection section tend to be arranged in parallel, and the adjacent three-piece steel arch frames for the intersection and the steel arch frames for the branch tunnel intersection section are arranged in parallel.

[0015] Compared with the prior art, the present utility model has the following technical effects:

[0016] An excavation structure for the intersection of a water conveyance tunnel of the present utility model connects the branch tunnel and the main tunnel through the gradually changing section of the branch tunnel lofting and the intersection section, and solves the problem of smooth connection of intersections of tunnels with different sizes and cross-section types. Before the branch tunnel is connected to the main water conveyance tunnel, the excavation structure of the present utility model adjusts the cross-section of the branch tunnel to the main tunnel cross-section in advance at the end of the axis, which helps to simplify the cross-section types of the flat intersections. The connection of different types of excavation cross-sections is transformed into the connection of the same excavation cross-section, which is conducive to promoting the standardization and standardization of the connection structure design of the tunnel intersection, and at the same time helps to improve the on-site construction progress. The excavation structure of the present utility model forms an excavation by using the arc sections on both sides of the intersection, which can effectively meet the requirements of muck transportation.

[0017] In addition, the layout structure design of the steel arch frames in the excavation structure of the present utility model can solve the problem of erection of the initial support measures at the intersection, and provides a guarantee for the safe construction of the intersection. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Schematic plan layout of an excavation structure at the intersection of a water conveyance tunnel according to an embodiment of the present utility model;

[0020] Figure 2 For Figure 1 Schematic diagram of the excavation cross-sections of the main tunnel and branch tunnel of the water conveyance tunnel in the middle;

[0021] Figure 3 Block diagram of the structural segmentation of the intersection section of an excavation structure at the intersection of a water conveyance tunnel according to an embodiment of the present utility model;

[0022] Figure 4 Schematic diagram of the structure of the general section of the branch tunnel and the gradually changing section of the branch tunnel lofting according to an embodiment of the present utility model;

[0023] Figure 5 Three-dimensional schematic diagram of the excavation structure of the intersection section according to an embodiment of the present utility model;

[0024] Figure 6 Schematic diagram of the excavation and lining structure of the intersection section according to an embodiment of the present utility model;

[0025] Figure 7 Plan layout diagram of the steel arch in the intersection section provided by the embodiment of the present utility model;

[0026] Figure 8 Elevation view of the steel arch layout in the intersection section and the gradually changing section of the branch tunnel lofting provided by the embodiment of the present utility model;

[0027] Figure 9 Three-dimensional structure schematic diagram of the steel arch in the intersection section and the gradually changing section of the branch tunnel lofting provided by the embodiment of the present utility model.

[0028] Among them, the reference numerals in the figures:

[0029] 1. Right-side excavation section of the branch tunnel, 2. Left-side excavation section of the branch tunnel, 3. Main tunnel section at the intersection, 4. Triangular area at the intersection, 5. General section of the branch tunnel, 6. Gradually changing section of the branch tunnel lofting, 7. Cross-section of the branch tunnel, 8. Cross-section of the main tunnel, 9. Three-piece steel arch at the intersection, 10. Steel arch in the intersection section of the branch tunnel, 11. Steel arch in the gradually changing section of the branch tunnel lofting, 12. Steel arch in the main tunnel section at the intersection. Detailed implementation manner

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0031] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the", and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0033] Please refer to Figures 1 - 9 , and a kind of excavation structure of the intersection of a water conveyance tunnel provided by the embodiment of the present invention will be described now.

[0034] In one embodiment, a kind of excavation structure of the intersection of a water conveyance tunnel in the embodiment of the present invention includes: a general section 5 of a branch tunnel, a lofting and gradient-changing section 6 of the branch tunnel, and an intersection section. The excavation section type of the lofting and gradient-changing section 6 of the branch tunnel transitions from the branch tunnel section 7 to the main tunnel section 8; the intersection section includes a right-side excavation expansion section 1 of the branch tunnel, a left-side excavation expansion section 2 of the branch tunnel, a main tunnel section 3 of the intersection, and an intersection triangular area 4; the tunnel axis of the intersection section is a leftward circular arc axis and a rightward circular arc axis, and the intersection triangular area 4 is formed between the leftward circular arc axis, the rightward circular arc axis and the tunnel axis of the main tunnel.

[0035] The typical excavation and support section of the excavation structure of the intersection of the water conveyance tunnel in this embodiment includes the main tunnel section 8, the branch tunnel section 7, and a gradually changing irregular section connected between the main tunnel section 8 and the branch tunnel section 7. The excavation and support sections of the general section 5 of the branch tunnel are all branch tunnel sections 7 and are arranged on the branch tunnel axis. The excavation and support section type of the intersection section is the main tunnel section 8, and the section is arranged on the branch tunnel axis and the main tunnel axis.

[0036] The excavation section type of the lofting and gradient-changing section 6 of the branch tunnel is formed by lofting and gradually changing from the branch tunnel section 7 to the main tunnel section 8, that is, transitioning from the branch tunnel section 7 to the main tunnel section 8. The starting and ending sections of the excavation section are the branch tunnel section 7 and the main tunnel section 8 respectively, and the rest of the excavation sections are all irregular sections. The lofting and gradient-changing section 6 of the branch tunnel is arranged on the branch tunnel axis, and the branch tunnel section type is gradually changed to the main tunnel section type in advance at the end of the branch tunnel axis to avoid arranging irregular sections on the intersection section.

[0037] An excavation structure at the intersection of a water conveyance tunnel in an embodiment of the utility model connects the branch tunnel and the main tunnel through a gradually changing section 6 of the branch tunnel lofting and an intersection section, solving the problem of smooth connection of tunnel intersections with different sizes and cross-section types. Before the branch tunnel is connected to the main water conveyance tunnel, the excavation structure in the embodiment of the utility model adjusts the cross-section 7 of the branch tunnel to the cross-section 8 of the main tunnel in advance at the end of the axis, which helps to simplify the cross-section type of the flat intersection, converts the connection of different types of excavation cross-sections into the connection of the same excavation cross-section, is conducive to promoting the standardization and standardization of the connection structure design of the tunnel intersection, and at the same time helps to improve the progress of on-site construction. The excavation structure in the embodiment of the utility model utilizes the arc segments on both sides of the intersection to form an enlarged excavation, which can effectively meet the requirements of muck transportation.

[0038] In one embodiment, the tunnel axis of the intersection section is two arcs, one to the left and one to the right. The left arc axis and the right arc axis are both tangent to the tunnel axis of the general section 5 of the branch tunnel and the tunnel axis of the main tunnel, forming an intersection triangle area 4. The intersection section consists of the following parts: the main tunnel cross-section sweeps to form three cylinders along the left arc axis, the right arc axis, and the tunnel axis of the main tunnel respectively; the intersection triangle area 4 is formed by sweeping the closed triangle area formed by the left arc axis, the right arc axis, and the axis of the main tunnel section of the intersection along the height direction of the excavation crown arch to form a cylinder, and the intersection section is formed by the union operation of the above cylinders. The three-dimensional excavation space of the intersection is formed by this method. Similarly, the inner contour of the intersection tunnel is formed by the same method, and the lining structure entity of the intersection is obtained by the union operation.

[0039] In one embodiment, the excavation cross-sections of the right-side enlarged excavation section 1 of the branch tunnel, the left-side enlarged excavation section 2 of the branch tunnel, and the main tunnel section 3 of the intersection are all the main tunnel cross-section 8. That is, the right-side enlarged excavation section 1 of the branch tunnel, the left-side enlarged excavation section 2 of the branch tunnel, the main tunnel section 3 of the intersection, and the intersection triangle area 4 overlap each other, and the union of the four forms the excavation body of the intersection section, which helps the vehicles at the intersection to turn left and right.

[0040] The branch tunnel cross-section 7 and the main tunnel cross-section 8 provided in the attached drawings of the embodiment of the utility model are arched. In addition, the branch tunnel cross-section 7 and the main tunnel cross-section 8 can also be any one of an oval, a circle, and a rectangle, and the cross-section can adopt a single-centered circle or a three-centered circle. The embodiment of the utility model does not make special limitations on the shape of the cross-section.

[0041] In one embodiment, a plurality of steel arch frames 12 of the main tunnel section of the intersection and three-piece steel arch frames 9 of the intersection are arranged in the intersection section, and the three-piece steel arch frames 9 of the intersection are vertically arranged with respect to the plurality of steel arch frames 12 of the main tunnel section of the intersection. The three-piece steel arch frames 9 of the intersection are the main load-bearing structures for the steel arch frames 12 of the main tunnel section of the intersection. The steel arch frames 12 of the main tunnel section of the intersection are vertically arranged with respect to the tunnel axis of the main tunnel. The three-piece steel arch frames 9 of the intersection are arranged close to the side line of the main tunnel, and the steel arch frames 12 of the main tunnel section of the intersection are vertically lapped on the three-piece steel arch frames 9 of the intersection.

[0042] Furthermore, multiple steel arch frames 11 for gradual change in layout of branch tunnels are provided in the gradual change section 6 of branch tunnel layout, and the multiple steel arch frames 11 for gradual change in layout of branch tunnels are arranged perpendicular to the tunnel axis of the general section 5 of the branch tunnel.

[0043] Furthermore, multiple steel arch frames 10 for branch tunnel intersections arranged dispersedly are also provided in the intersection section. The adjacent steel arch frames 11 for gradual change in layout of branch tunnels and the steel arch frames 10 for branch tunnel intersections tend to be arranged in parallel, and the adjacent three - piece steel arch frames 9 for intersections and the steel arch frames 10 for branch tunnel intersections are arranged in parallel. That is, the first steel arch frame 10 for branch tunnel intersections is approximately parallel to the steel arch frame 11 for gradual change in layout of branch tunnels, and gradually changes and disperses to be parallel to the three - piece steel arch frames 9 for intersections.

[0044] In the excavation structure of the embodiment of the present utility model, the layout structure design of the steel arch frame can solve the problem of erection of initial support measures at intersections, providing guarantee for the safe construction of intersections.

[0045] The above embodiments only represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. An excavation structure for the intersection of a water conveyance tunnel, characterized in that, Including: The generally-connected branch tunnel section, the branch tunnel lofting transition section and the intersection section; The excavation cross-section type of the branch tunnel lofting transition section transitions from the branch tunnel cross-section to the main tunnel cross-section; The intersection section includes the branch tunnel right-side excavation section, the branch tunnel left-side excavation section, the intersection main tunnel section and the intersection triangle area; the tunnel axis of the intersection section is a leftward circular arc axis and a rightward circular arc axis, and the intersection triangle area is formed between the leftward circular arc axis, the rightward circular arc axis and the tunnel axis of the main tunnel.

2. The excavation structure of a water conveyance tunnel intersection according to claim 1, characterized in that Both the leftward circular arc axis and the rightward circular arc axis are tangent to the tunnel axis of the generally-connected branch tunnel section and the tunnel axis of the main tunnel.

3. The excavation structure of a water conveyance tunnel intersection according to claim 1, wherein The branch tunnel lofting transition section is formed by lofting and transitioning from the branch tunnel cross-section to the main tunnel cross-section.

4. The excavation structure at the intersection of a water conveyance tunnel as described in claim 1, characterized in that, The excavation cross-sections of the branch tunnel right-side excavation section, the branch tunnel left-side excavation section and the intersection main tunnel section are all the main tunnel cross-section.

5. The excavation structure of a water conveyance tunnel intersection according to claim 1, characterized in that The branch tunnel cross-section and the main tunnel cross-section can be any one of an arch shape, an oval shape, a circular shape, and a rectangular shape.

6. A water conveyance tunnel intersection excavation structure according to any one of claims 1-5, characterized in that, A plurality of intersection main tunnel section steel arch frames and intersection triple-joined steel arch frames are provided in the intersection section, and the intersection triple-joined steel arch frames are vertically arranged with respect to the plurality of intersection main tunnel section steel arch frames.

7. The excavation structure of a water conveyance tunnel intersection according to claim 6, characterized in that, A plurality of branch tunnel lofting transition section steel arch frames are provided in the branch tunnel lofting transition section, and the plurality of branch tunnel lofting transition section steel arch frames are vertically arranged with respect to the tunnel axis of the generally-connected branch tunnel section.

8. A water conveyance tunnel intersection excavation structure according to claim 7, characterized in that, A plurality of branch tunnel intersection section steel arch frames are further provided in the intersection section, and the adjacent branch tunnel lofting transition section steel arch frames and the branch tunnel intersection section steel arch frames tend to be arranged in parallel, and the adjacent intersection triple-joined steel arch frames and the branch tunnel intersection section steel arch frames are arranged in parallel.

Images