Connection channel portal structure

Abstract

The utility model discloses a connecting channel tunnel portal structure which solves the problem that in the prior art, when a connecting channel is eccentrically constructed through a mechanical method, the tunnel portal structure is difficult to arrange. The utility model relates to a connecting channel tunnel portal structure which comprises a blocking steel ring arranged at the end of the connecting channel structure, and the blocking steel ring is fixed to a door opening formed in a main tunnel structure through a tunnel portal steel ring. The axis of the connection channel structure and the axis of the main tunnel structure are eccentrically arranged, and the part, extending into the main tunnel structure, of the blocking steel ring is of a non-whole-ring structure. The connection channel structure is composed of the plugging steel rings, the pipe pieces of the plugging steel rings are spliced in a staggered joint mode, and after splicing is completed, the steel pipe pieces located in the main tunnel are cut off; the structure stress and waterproof requirements of the tunnel portal structure under eccentric construction of the connecting channel are met; and the problem that the tunnel portal structure is difficult to arrange during eccentric construction of the existing mechanical connection channel is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of connecting passage construction, in particular to a connecting passage portal structure. Background Technique

[0002] With the popularization of mechanical construction methods, mechanical connecting passages have been applied across the country. However, the structure of the mechanical connecting passage is different from the traditional excavation structure. It uses a tunneling machine for excavation and segment support. When it is connected to the main tunnel portal structure, after the connecting passage structure is constructed, the form of the portal connection has changed.

[0003] When the diameter of the main tunnel is large, in order to meet the height requirements of the evacuation platform, the axis of the connecting passage and the axis of the main tunnel may not be in the same plane, that is, the axis of the connecting passage is eccentric. This results in the portal structure not being symmetric up and down, and the lengths of the connecting passage segments entering the main tunnel being different, which will change the overall layout of the structure, and the traditional structure layout form is no longer applicable.

[0004] In the prior art, such as a joint connection structure between a connecting passage and an interval tunnel with the application number CN201920052454.1, its joint connection structure includes an annular steel plate connecting the steel segment and the composite segment. Leakage plugging materials are arranged in the gap between the steel segment outside the annular steel plate and the composite segment. Reinforced concrete is poured between the composite segment inside the annular steel plate and the steel segment to form an integral structure. And a full - package portal structure for the interface between a shield - driven connecting passage and a main tunnel with the application number CN202321623220.0, including a post - cast portal structure, which includes an external portal structure and a middle portal structure connected to each other. The arc side of the external portal structure gradually changes along with the inner arc surface of the steel - concrete composite lining of the main tunnel, and the arc side of the middle portal structure gradually changes along with the inner arc surface of the connecting passage steel segment. However, the above two solutions are both applicable to the portal structure where the axis of the connecting passage and the axis of the main tunnel are coplanar, and do not consider the eccentric portal structure form. Therefore, when the mechanical connecting passage is constructed eccentrically in the prior art, there are still problems such as difficult portal structure layout, cumbersome procedures, and waste of pipe materials. Content of the Utility Model

[0005] Aiming at the deficiencies in the above - mentioned background technique, the utility model proposes a connecting passage portal structure, which solves the problem of difficult layout of the portal structure during eccentric construction of the mechanical connecting passage in the prior art.

[0006] The technical solution of the present utility model is realized as follows: A portal structure for a connection passage, which includes a sealing steel ring arranged at the end of the connection passage structure. The sealing steel ring is fixed to the portal opening provided on the main tunnel structure through a portal steel ring; the axis of the connection passage structure is eccentrically arranged with respect to the axis of the main tunnel structure, and the part of the sealing steel ring extending into the main tunnel structure is a non-integral ring structure. The connection passage is constructed by a tunneling machine. There is an eccentricity between the tunneling axis of the connection passage and the axis of the main tunnel. The connection between the connection passage and the main tunnel is in a saddle shape with different heights. If the axis of the connection passage is eccentric downward, the lower saddle bridge at the connection between the connection passage and the main tunnel is higher and the upper part is lower, and vice versa.

[0007] Further preferably, the connection passage structure is formed by splicing a plurality of positive ring segments with staggered joints; the sealing steel ring includes a first-ring sealing steel ring, an intermediate sealing steel ring, and a tail-ring sealing steel ring arranged in sequence from the outside to the inside along the main tunnel structure; the first-ring sealing steel ring is an integral ring structure, and the intermediate sealing steel ring and the tail-ring sealing steel ring are non-integral ring structures.

[0008] Further preferably, the first-ring sealing steel ring, the intermediate sealing steel ring, and the tail-ring sealing steel ring are arranged with staggered joints. The top of the first-ring sealing steel ring contacts the main tunnel structure; both sides of the intermediate sealing steel ring contact the main tunnel structure, and the bottom of the tail-ring sealing steel ring contacts the main tunnel structure. The sealing steel ring is a steel-concrete segment structure composed of multiple rings, which contacts the main tunnel and isolates the soil outside the tunnel structure. Each ring of segments is composed of two segments of different sizes or multiple segments, and is assembled with staggered joints. Then, the segments that do not contact the portal are removed and recycled, which can save costs.

[0009] Further preferably, the first-ring sealing steel ring, the intermediate sealing steel ring, and the tail-ring sealing steel ring are arranged in a stepped shape or an arc shape or a saddle shape. After the segments that do not contact the portal are removed and recycled, the outer contours of the first-ring sealing steel ring, the intermediate sealing steel ring, and the tail-ring sealing steel ring are irregularly distributed, and according to the removed segment structure, they can form a stepped shape, an arc shape, or a saddle shape.

[0010] Further preferably, a composite segment is provided at the corresponding position between the main tunnel structure and the connection passage structure. The composite segment is cut to form a portal opening, and a composite segment steel ring is provided inside the portal opening.

[0011] Further preferably, the portal steel ring is composed of a plurality of steel plates arranged circumferentially along the composite segment steel ring, and the steel plates are fixed between the composite segment steel ring and the sealing steel ring. According to needs, the portal steel ring can also adopt a ring-shaped steel structure.

[0012] Further preferably, a water-stop grouting structure is provided on the outside of the intersection between the sealing steel ring and the main tunnel structure; a portal ring beam is provided between the sealing steel ring and the composite segment.

[0013] Further preferably, an evacuation platform corresponding to the plugging steel ring is provided in the main tunnel structure; a transition step or a transition gentle slope is arranged between the evacuation platform and the plugging steel ring for handling the height difference at the interface. A surplus cable bin is provided at the bottom of the plugging steel ring.

[0014] Further preferably, a leveling structure for the connection passage is laid at the bottom of the connection passage structure, and a fire door frame connected to the portal steel ring is provided in the plugging steel ring. The fire door frame is located on the leveling structure for the connection passage, and the upper surface of the leveling structure for the connection passage is a horizontal plane or an inclined plane.

[0015] The beneficial effects of the present utility model are as follows: The connection passage structure of the present utility model is composed of a plugging steel ring, and the segments of the plugging steel ring are assembled with staggered joints. After the assembly is completed, the steel segments located in the main tunnel are removed; it meets the structural stress and waterproof requirements of the portal structure under the eccentric construction of the connection passage; it improves the construction efficiency and solves the problems such as the difficulty in arranging the portal structure during the eccentric construction of the connection passage by the existing mechanical method. The present utility model adopts external waterproofing and an in-situ cast or precast portal ring beam inside to connect the connection passage and the main tunnel together to ensure the overall stability and overall strength. The connection passage portal structure provided by the present utility model has a clear structural form, strong reproducibility, is safe and reliable, and provides a new idea for the eccentric construction of the connection passage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic cross-sectional view of the support structure of the connection passage and the completion of the water-stop grouting of the portal;

[0018] Figure 2 It is a schematic cross-sectional view of the completion of the removal of the plugging steel ring of the connection passage and the construction of the portal steel ring;

[0019] Figure 3 It is a schematic cross-sectional view of the completion of the construction of the portal ring beam and the leveling structure of the connection passage;

[0020] Figure 4 It is a schematic cross-sectional view of the connection passage structure without removing the redundant plugging steel ring;

[0021] Figure 5 It is a schematic cross-sectional view of the connection passage structure with the redundant plugging steel ring removed;

[0022] Figure 6 For Figure 3 the schematic cross-sectional view A-A in

[0023] Figure 7 For Figure 3 Schematic diagram of section B-B in

[0024] Figure 8 For Figure 3 Schematic diagram of section C-C in

[0025] In the figure, 1 is the connection passage structure; 111 is the plugging steel ring; 1111 is the first-ring plugging steel ring; 1112 is the middle-ring plugging steel ring; 1113 is the tail-ring plugging steel ring; 112 is the positive-ring segment; 12 is the leveling structure of the connection passage; 2 is the main tunnel structure; 21 is the composite segment; 22 is the steel ring of the composite segment; 23 is the evacuation platform; 31 is the portal steel ring; 32 is the water-stop grouting structure; 33 is the transition step; 34 is the portal ring beam; 35 is the fire door frame; 4 is the redundant cable bin. Specific implementation mode

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] As Figure 1 shown, in Embodiment 1, a connection passage portal structure includes a plugging steel ring 111 arranged at the end of the connection passage structure 1. The connection passage structure 1 is formed by splicing a plurality of positive-ring segments 112 with staggered joints. The plugging steel ring 111 is connected to the positive-ring segment 112 at the end; the plugging steel ring 111 extends into the segment of the main tunnel structure 2 to become a negative-ring segment. The plugging steel ring 111 is fixed at the portal opening arranged on the main tunnel structure 2 through the portal steel ring 31; the axis of the connection passage structure 1 is eccentrically arranged with the axis of the main tunnel structure 2; the connection passage is constructed by a tunneling machine, and there is an eccentricity between the tunneling axis of the connection passage and the axis of the main tunnel. The connection between the connection passage and the main tunnel is in a saddle shape with different heights. If the axis of the connection passage is eccentric downward, the lower saddle bridge at the connection between the connection passage and the main tunnel is higher and the upper part is lower, and vice versa. The part of the plugging steel ring 111 extending into the main tunnel structure 2 is a non-integral ring structure; that is, the part extending into the main tunnel structure 2 is formed by removing the plugging steel ring, completing the removal and recycling of some segments, and saving costs. The above connection passage portal structure is arranged with a non-integral ring structure inside the main tunnel structure 2 through the plugging steel ring 111, which meets the structural stress under the eccentric construction of the connection passage and solves the problem that it is difficult to arrange the portal structure during the eccentric construction of the existing mechanical connection passage.

[0028] In this embodiment, as an implementation scheme, asFigure 2 As shown, the first ring plugging steel ring 1111, the middle ring plugging steel ring 1112 and the tail ring plugging steel ring 1113 are arranged with staggered joints. The plugging steel ring 111 includes the first ring plugging steel ring 1111, the middle ring plugging steel ring 1112 and the tail ring plugging steel ring 1113 arranged in sequence from the outside to the inside along the main tunnel structure 2. The first ring plugging steel ring 1111 is a complete ring structure, and the middle ring plugging steel ring 1112 and the tail ring plugging steel ring 1113 are non-complete ring structures. The plugging steel ring is a steel-concrete segment structure composed of multiple rings, which is in contact with the main tunnel and isolates the soil outside the tunnel structure. Each ring of segments is composed of two segments, one large and one small, or multiple segments, and is assembled with staggered joints. Then, the segments that do not contact the tunnel opening are removed and recycled, which can save costs.

[0029] As Figure 3 shown, in Embodiment 2, a connecting passage portal structure. On the basis of Embodiment 1, in this embodiment, the first ring plugging steel ring 1111 can adopt one ring or multiple rings, and part of the top of the first ring plugging steel ring 1111 is in contact with the main tunnel structure 2. The two sides of the middle ring plugging steel ring 1112 are in contact with the main tunnel structure 2, and the bottom of the tail ring plugging steel ring 1113 is in contact with the main tunnel structure 2. The contact part is connected to the main tunnel structure by the portal steel ring 31. Part of the segments of the middle ring plugging steel ring 1112 and the tail ring plugging steel ring 1113 that are not in contact with the main tunnel structure can be removed. When the plugging steel ring forms a complete ring with two segments, one large and one small, the first ring plugging steel ring is a complete ring, and the removed middle ring plugging steel ring 1112 and tail ring plugging steel ring 1113 are both half rings, and the whole is arranged in a stepped shape. When the plugging steel ring forms a complete ring with multiple segments, the redundant parts of the first ring plugging steel ring 1111, the middle ring plugging steel ring 1112 and the tail ring plugging steel ring 1113 are arranged in an arc shape or a saddle shape to ensure the stability of the entire portal structure.

[0030] In this embodiment, a composite segment 21 is provided at the corresponding position of the main tunnel structure 2 and the connecting passage structure 1. When the connecting passage tunneling machine tunnels, the composite segment 21 can be cut to form a portal opening. A composite segment steel ring 22 is provided in the portal opening to improve the stability of the portal opening and provide support for the portal structure at the same time.

[0031] As Figure 4 , 6 shown, in this embodiment, the portal steel ring 31 is composed of several steel plates arranged circumferentially along the composite segment steel ring 22, and the steel plates are fixed between the composite segment steel ring 22 and the plugging steel ring 111. The connection between the plugging steel ring and the main tunnel is welded with multiple small steel plates to form the portal steel ring to ensure the connection strength and waterproof effect. In addition, it should be noted that the above portal steel ring 31 can also adopt an integral ring steel structure according to needs to ensure the connection strength and waterproof effect.

[0032] Embodiment 3. A portal structure for a connection passage. On the basis of Embodiment 1 or 2, a water-stop grouting structure 32 is provided on the outer side of the intersection of the plugging steel ring 111 and the main tunnel structure 2, and waterproof grouting operation is carried out from the outside to form a waterproof and strengthening structure. As Figure 5 shown, a portal ring beam 34 is provided between the plugging steel ring 111 and the composite segment 21; the portal ring beam can be a cast-in-place structure or a precast structure, and a steel bar framework formwork is erected and concreted or a precast portal ring beam structure is connected based on the plugging steel ring and the composite segment; the portal ring beam wraps the connection passage and the main tunnel together to ensure the overall stability and waterproofness.

[0033] As Figure 7 shown, in this embodiment, an evacuation platform 23 corresponding to the plugging steel ring 111 is provided in the main tunnel structure 2. A transition step 33 is arranged between the evacuation platform 23 and the plugging steel ring 111 to realize the transition between the connection passage and the evacuation platform. Or, as Figure 3 shown, a transition gentle slope 36 is arranged between the evacuation platform 23 and the plugging steel ring 111 to deal with the problem of height difference at the interface and realize the transition between the connection passage and the evacuation platform.

[0034] In addition, as Figure 8 shown, a redundant cable bin 4 is provided at the bottom of the plugging steel ring 111. The redundant cable bin is used to store the redundant cables in the main tunnel. A leveling structure 12 for the connection passage is laid at the bottom of the connection passage structure 1, and the upper surface of the leveling structure 12 for the connection passage is a horizontal plane as Figure 2 shown, or the upper surface of 12 is an inclined plane as Figure 3 shown, gradually inclining in the direction from left to right to realize a smooth transition. A fire door frame 35 connected to the portal steel ring 31 is provided in the plugging steel ring 111, and the fire door frame 35 is located on the leveling structure 12 in the connection passage; the fire door frame 35 can be composed of multiple structural plates, and a rectangular door opening structure is formed in the middle.

[0035] The above-mentioned mechanical method portal structure for the connection passage of the present utility model is specifically constructed as follows:

[0036] S1. After the connection passage structure 1 is completed, start water-stop grouting at the portal to form a water-stop grouting structure 32, remove the tunneling equipment, and weld the plugging steel ring 111 and the main tunnel structure 2 with multiple small steel plates to connect and form a portal steel ring 31; as Figure 1 、 6 shown.

[0037] S2. As Figure 2 、 3 shown, remove and recycle the plugging steel ring that does not contact the portal, and then erect a steel bar framework formwork and pour concrete or connect a precast portal structure based on the plugging steel ring and the composite segment, as Figure 5As shown in the figure. Among them, according to the encroachment requirements of the main tunnel, it is judged whether to cut off the sealing steel ring extending into the main tunnel along the portal.

[0038] S3. As Figure 7 , 8 As shown in the figure, according to parameters such as the designed gradient, height of the connection tunnel and the position of the fire door, the portal, the connection tunnel are leveled and other functional structures are cast in situ. After the structure construction is completed, fire doors, etc. are installed. Among them, according to the later requirements, a surplus cable cavity can be set in the space below the fire door frame.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A connection passage portal structure, characterized in that: It includes a plugging steel ring (111) arranged at the end of the connection passage structure (1). The plugging steel ring (111) is fixed to the portal opening on the main tunnel structure (2) through the portal steel ring (31); the axis of the connection passage structure (1) is eccentrically arranged with the axis of the main tunnel structure (2); the part of the plugging steel ring (111) extending into the main tunnel structure (2) is a non-integral ring structure.

2. The connection passage portal structure according to claim 1, wherein: The connection passage structure (1) is formed by splicing a number of positive segment linings (112) with staggered joints; the plugging steel ring (111) includes a first-ring plugging steel ring (1111), an intermediate plugging steel ring (1112), and a tail-ring plugging steel ring (1113) arranged in sequence from the outside to the inside of the main tunnel structure (2); the first-ring plugging steel ring (1111) is an integral ring structure, and the intermediate plugging steel ring (1112) and the tail-ring plugging steel ring (1113) are non-integral ring structures.

3. The connection passage portal structure according to claim 2, characterized in that: The first-ring plugging steel ring (1111), the intermediate plugging steel ring (1112), and the tail-ring plugging steel ring (1113) are arranged with staggered joints. The top of the first-ring plugging steel ring (1111) contacts the main tunnel structure (2); both sides of the intermediate plugging steel ring (1112) contact the main tunnel structure (2), and the bottom of the tail-ring plugging steel ring (1113) contacts the main tunnel structure (2).

4. The connection passage portal structure according to claim 3, wherein: The first-ring plugging steel ring (1111), the intermediate plugging steel ring (1112), and the tail-ring plugging steel ring (1113) are arranged in a stepped shape or an arc shape or a saddle shape.

5. The portal structure of the connection passage according to any one of claims 1 to 4, characterized in that: A composite segment (21) is arranged at the position of the main tunnel structure (2) corresponding to the connection passage structure (1). The composite segment (21) is cut to form a portal opening, and a composite segment steel ring (22) is arranged inside the portal opening.

6. The portal structure of the connection passage according to claim 5, characterized in that: The portal steel ring (31) is composed of a number of steel plates arranged circumferentially along the composite segment steel ring (22), and the steel plates are fixed between the composite segment steel ring (22) and the plugging steel ring (111).

7. The portal structure of the connection passage according to claim 5, characterized in that: A water-stop grouting structure (32) is arranged outside the intersection of the plugging steel ring (111) and the main tunnel structure (2); a portal ring beam (34) is arranged between the plugging steel ring (111) and the composite segment (21).

8. The portal structure of the connection passage according to claim 6 or 7, characterized in that: An evacuation platform (23) corresponding to the plugging steel ring (111) is arranged inside the main tunnel structure (2); a transition step (33) or a transition gentle slope (36) is arranged between the evacuation platform (23) and the plugging steel ring (111).

9. The connection passage portal structure according to claim 8, characterized in that: A redundant cable bin (4) is arranged at the bottom of the plugging steel ring (111).

10. The connection passage portal structure according to claim 1, characterized in that: A connection passage leveling structure (12) is laid at the bottom of the connection passage structure (1). A fire door frame (35) connected to the portal steel ring (31) is arranged inside the plugging steel ring (111). The fire door frame (35) is located on the connection passage leveling structure (12), and the upper surface of the connection passage leveling structure (12) is a horizontal plane or an inclined plane.

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