Plugging device for shield launching tunnel portal

Abstract

The utility model discloses a plugging device for a shield launching tunnel portal, which comprises a tunnel inner ring pre-buried on the inner circumferential surface of the shield launching tunnel portal, an end face ring pre-buried on the outer end face of the shield launching tunnel portal, and an annular flexible cord fabric, the tunnel inner ring is fixedly connected with the end face ring, and the end face ring is fixedly connected with the flexible cord fabric. The flexible curtain cloth is provided with an outer peripheral edge fixing part and an inner ring overturning part, the outer peripheral edge fixing part is fixed to the end face ring, the inner ring overturning part can overturn towards the interior of the shield launching tunnel portal, a plurality of folding overturning plates are arranged on the portion, on the outer side of the flexible curtain cloth, of the end face ring, and the folding overturning plates are arranged around the peripheral side of the flexible curtain cloth at intervals. An annular high-density sponge is arranged on the inner circumferential surface of the hole inner ring, the ring width of the high-density sponge is set to be R, the distance between the high-density sponge and the end face ring is set to be L, the ring width of the inner ring overturning part is set to be r, and R2 + L2lt is met; r1, r2. The blocking device for the tunnel portal of the shield launching is simple in overall structure, low in construction cost and good in effect of preventing water and sand from gushing in the shield launching process.

Description

Technical Field

[0001] The utility model relates to the technical field of shield construction, in particular to a blocking device for a tunnel opening where a shield machine starts. Background Art

[0002] In the shield method subway construction, since the shield machine cutter head enters the tunnel, it is one of the processes that is prone to accidents. Most of the accidents that occur during the shield machine construction are caused by unstable soil at the tunnel entrance and leakage. Especially when the water content of the stratum within the construction range is high, the stratum is disturbed during the shield machine construction process, which easily forms a seepage channel for groundwater between the tunnel entrance and the shield machine shell. The groundwater flows out with mud and sand, causing accidents such as water and sand gushing. Especially for the fully weathered granite layer, it has the characteristics of softening and disintegrating when it encounters water. If it is not handled properly during construction, it may cause the stratum to become unstable, water and sand gushing, causing ground collapse and foundation pit instability. Therefore, it is necessary to stop the water at the tunnel entrance to ensure the smooth start of the shield machine.

[0003] The existing tunnel portal sealing device and sealing method for shield tunneling with application number 202010707049.6 seals the tunnel portal by combining a folding pressure plate on the outer ring plate of the tunnel opening, an annular rubber curtain and an annular elastic telescopic sealing steel plate. On the one hand, the overall structure is complex and the construction cost is high; on the other hand, the annular elastic telescopic sealing steel plate is assembled by multiple components, and there is a problem of sealing coordination between the components, which results in poor effect in preventing water and sand gushing at the start of the shield tunneling. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a blocking device for a tunnel opening for shield tunneling which has a simple overall structure, low construction cost and good effect of preventing water and sand gushing from shield tunneling.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A blocking device for a tunnel opening for shield tunneling, comprising an inner ring embedded in the inner circumference of a shield tunneling portal, an end ring embedded in the outer end face of the shield tunneling portal, and a ring-shaped flexible curtain, wherein the inner ring and the end ring are fixedly connected, the flexible curtain has an outer circumferential edge fixing portion and an inner ring flipping portion, the outer circumferential edge fixing portion is fixed on the end ring, the inner ring flipping portion can flip into the shield tunneling portal, the end ring is provided with a plurality of folding flaps on the outer side of the flexible curtain, each of the folding flaps is arranged at intervals around the circumference of the flexible curtain, the inner circumferential surface of the inner ring is provided with a ring-shaped high-density sponge, the ring width of the high-density sponge is set to R, the distance between the high-density sponge and the end ring is set to L, the ring width of the inner ring flipping portion is set to r, satisfying R2+L2 <r2。

[0007] As a further improvement of the above technical solution:

[0008] The high-density sponge is fixed on the inner ring of the hole through a plurality of fixing mechanisms, and the fixing mechanisms are arranged at intervals around the center of the inner ring of the hole.

[0009] The fixing mechanism includes a pressure rod and two support rods. The two support rods are fixed on the inner ring of the hole and are respectively located on the inner and outer sides of the high-density sponge. The pressure rod is arranged between the two support rods and penetrates through the high-density sponge.

[0010] Nuts are provided on the support rods. The pressure rod is movably sleeved on the support rods and is limited by the nuts.

[0011] The support rod is a screw rod welded to the inner ring of the hole.

[0012] The swing center of the folding flap is located outside the outer peripheral fixing part. The distance between the swing center of the folding flap and the center line of the shield starting portal is set as S1, and the distance between the turning center of the inner ring turning part and the center line of the shield starting portal is set as S2, satisfying S1 < S2.

[0013] The swing length of the folding flap is set as m, satisfying R2 + L2 > m2.

[0014] A fixing ring is provided outside the outer peripheral fixing part, and the folding flap is hinged on the fixing ring.

[0015] The fixing ring and the end face ring are fixed on the side wall of the shield starting portal through bolts.

[0016] The flexible curtain is a rubber curtain, and both the inner ring of the hole and the end face ring are steel rings.

[0017] Compared with the prior art, the advantages of the present utility model are as follows:

[0018] The plugging device for the tunnel entrance used for shield starting, on the one hand, forms a water and slurry stop barrier through the folding flap, the inner ring turning part and the high-density sponge, with a simple overall structure and low construction cost; on the other hand, the high-density sponge is an integral structure, with good effect of preventing water and sand gushing during shield starting, and furthermore, through the folding flap, the inner ring turning part and the high-density sponge, three water and slurry stop barriers from outside to inside are formed, further improving the effect of preventing water and sand gushing during shield starting. And R + L < r, ensuring that the high-density sponge can be extruded by the inner ring turning part during the process of the shield machine entering the hole, ensuring that the high-density sponge is not squeezed and impacted by the shield machine, thus ensuring the safety of shield starting. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the tunnel entrance used for shield starting of the present utility model.

[0020] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0021] Figure 3 The utility model is a structural schematic diagram of a shield machine passing through a tunnel opening where shield tunneling starts.

[0022] Figure 4 The utility model is a schematic structural diagram of waterproofing a post-molded tunnel after a shield machine passes through a tunnel opening where shield tunneling starts.

[0023] Figure 5 The utility model is a structural schematic diagram of a folding flap of a blocking device for a tunnel opening where a shield machine starts.

[0024] The symbols in the figure represent:

[0025] 1. Inner ring of the hole; 2. End face ring; 3. Flexible curtain; 31. Outer peripheral fixing part; 32. Inner ring turning part; 4. Folding flap; 5. High-density sponge; 6. Fixing mechanism; 61. Pressure rod; 62. Support rod; 63. Nut; 7. Fixing ring; 8. Bolt; 9. Shield machine; 91. Segment. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0029] In the present utility model, unless otherwise clearly defined and limited, terms such as "assembly", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] Figures 1 to 5 An embodiment of the plugging device for the tunnel entrance of shield starting of the present utility model is shown. The plugging device for the tunnel entrance of shield starting of the present utility model includes a hole inner ring 1 embedded in the inner circumferential surface of the shield starting portal, an end face ring 2 embedded in the outer end face of the shield starting portal, and a flexible curtain cloth 3 in a ring shape. The hole inner ring 1 and the end face ring 2 are fixedly connected. The flexible curtain cloth 3 has an outer peripheral edge fixing part 31 and an inner ring turning part 32. The outer peripheral edge fixing part 31 is fixed on the end face ring 2, and the inner ring turning part 32 can turn towards the inside of the shield starting portal. A plurality of hinge flaps 4 are arranged on the outer side of the flexible curtain cloth 3 by the end face ring 2, and the hinge flaps 4 are arranged at intervals around the circumferential side of the flexible curtain cloth 3. A high-density sponge 5 in a ring shape is arranged on the inner circumferential surface of the hole inner ring 1. The ring width of the high-density sponge 5 is set as R, the distance between the high-density sponge 5 and the end face ring 2 is set as L, and the ring width of the inner ring turning part 32 is set as r, satisfying R2 + L2 < r2.

[0031] The plugging device for the tunnel entrance of shield starting of the present invention, on the one hand, forms a water and slurry stop barrier through the hinge flap 4, the inner ring turning part 32 and the high-density sponge 5 (as Figure 3 and Figure 4 shown). The overall structure is simple and the construction cost is low. On the other hand, the high-density sponge 5 is an integral structure, and the effect of preventing water and sand gushing during shield starting is good. Moreover, a three-layer water and slurry stop barrier from outside to inside is formed through the hinge flap 4, the inner ring turning part 32 and the high-density sponge 5, further improving the effect of preventing water and sand gushing during shield starting. And R2 + L2 < r2 ensures that the inner ring turning part 32 can squeeze the high-density sponge 5 during the process of the shield machine 9 entering the tunnel, ensuring that the high-density sponge 5 is not squeezed and impacted by the shield machine 9, thus ensuring the safety of shield starting.

[0032] Furthermore, in this embodiment, the high-density sponge 5 is fixed on the hole inner ring 1 through a plurality of fixing mechanisms 6, and the fixing mechanisms 6 are arranged at intervals around the center of the hole inner ring 1. This fixing method of the high-density sponge 5 improves the stability of the high-density sponge 5 and ensures that the high-density sponge 5 is not squeezed and impacted during the process of the shield machine 9 entering the tunnel, resulting in the failure of this slurry stop barrier.

[0033] Furthermore, in this embodiment, as Figure 2As shown, the fixing mechanism 6 includes a pressure rod 61 and two support rods 62. The two support rods 62 are fixed on the inner ring 1 of the hole and are respectively located on the inner and outer sides of the high-density sponge 5. The pressure rod 61 is arranged between the two support rods 62 and passes through the high-density sponge 5. This fixing mechanism 6 has a simple structure and is convenient for disassembly and assembly.

[0034] Furthermore, in this embodiment, a nut 63 is provided on the support rod 62. The pressure rod 61 is movably sleeved on the support rod 62 and is limited by the nut 63. Specifically, the support rod 62 is a screw rod welded to the inner ring 1 of the hole. The nut 63 is threadedly connected to the support rod 62, and the pressing degree of the high-density sponge 5 by the pressure rod 61 can be adjusted by screwing the nut 63.

[0035] Furthermore, in this embodiment, the swing center of the folding flap 4 is located outside the outer peripheral fixing part 31. The distance between the swing center of the folding flap 4 and the center line of the shield starting portal is set as S1, and the distance between the turning center of the inner ring turning part 32 and the center line of the shield starting portal is set as S2, satisfying S1 < S2. Furthermore, in this embodiment, the swing length of the folding flap 4 is set as m, satisfying R2 + L2 > m2. When the shield machine 9 passes through, as Figure 3 shown, the folding flap 4, the inner ring turning part 32 and the high-density sponge 5 all abut against the circumference of the shield machine 9 to form water stop; after the shield machine 9 passes through, as Figure 4 shown, the inner ring turning part 32 and the high-density sponge 5 all abut against the circumference of the segment 91 to form waterproofing for the formed tunnel.

[0036] Furthermore, in this embodiment, a fixing ring 7 is provided outside the outer peripheral fixing part 31. The folding flap 4 is hinged on the fixing ring 7.

[0037] Furthermore, in this embodiment, the fixing ring 7 and the end face ring 2 are fixed on the side wall of the shield starting portal by bolts 8. The structure is simple and the construction is convenient.

[0038] Furthermore, in this embodiment, the flexible curtain 3 is a rubber curtain, and the inner ring 1 of the hole and the end face ring 2 are both steel rings.

[0039] Furthermore, in this embodiment, the center lines of the inner ring 1 of the hole, the end face ring 2 and the fixing ring 7 all coincide with the center line of the shield starting portal.

[0040] Furthermore, the center lines of the flexible curtain 3 and the high-density sponge 5 all coincide with the center line of the shield starting portal.

[0041] The inner diameter of the high-density sponge 5 is determined according to actual needs, and when the shield machine 9 passes through, it squeezes the circumference of the shield machine 9.

[0042] Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the art can use the above disclosed technical content to make many possible changes and modifications to the technical solution of the present invention without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A blocking device for a tunnel opening for shield tunneling, comprising an inner ring (1) pre-buried in the inner circumference of the shield tunneling portal, an end face ring (2) pre-buried in the outer end face of the shield tunneling portal, and a ring-shaped flexible curtain (3), wherein the inner ring (1) and the end face ring (2) are fixedly connected, and the flexible curtain (3) has an outer circumferential edge fixing portion (31) and an inner ring turning portion (32), characterized in that: The outer peripheral fixing portion (31) is fixed on the end face ring (2), and the inner ring flipping portion (32) can be flipped toward the shield starting tunnel portal. The end face ring (2) is provided with a plurality of folding flaps (4) on the outer side of the flexible curtain (3), and each of the folding flaps (4) is arranged at intervals around the circumference of the flexible curtain (3). The inner peripheral surface of the inner ring (1) is provided with a ring-shaped high-density sponge (5), the ring width of the high-density sponge (5) is set to R, the distance between the high-density sponge (5) and the end face ring (2) is set to L, and the ring width of the inner ring flipping portion (32) is set to r, satisfying R 2 +L 2 <r 2 .

2. The blocking device for the tunnel opening for shield tunneling according to claim 1 is characterized in that: The high-density sponge (5) is fixed on the inner hole ring (1) via a plurality of fixing mechanisms (6), and the fixing mechanisms (6) are arranged at intervals around the center of the inner hole ring (1).

3. The blocking device for the tunnel opening for shield tunneling according to claim 2 is characterized in that: The fixing mechanism (6) comprises a pressure rod (61) and two support rods (62). The two support rods (62) are fixed on the inner ring (1) of the hole and are respectively located on the inner and outer sides of the high-density sponge (5). The pressure rod (61) is arranged between the two support rods (62) and penetrates the high-density sponge (5).

4. The blocking device for the tunnel opening for shield tunneling according to claim 3 is characterized in that: The support rod (62) is provided with a nut (63), and the pressure rod (61) is movably sleeved on the support rod (62) and is limited in position by the nut (63).

5. The blocking device for the tunnel opening for shield tunneling according to claim 4 is characterized in that: The support rod (62) is a screw rod welded to the inner ring (1) of the hole.

6. The blocking device for a tunnel opening for shield tunneling according to any one of claims 1 to 5, characterized in that: The swing center of the folding flap (4) is located outside the outer peripheral fixed portion (31), the distance between the swing center of the folding flap (4) and the center line of the shield starting tunnel is set to S1, and the distance between the flip center of the inner ring flip part (32) and the center line of the shield starting tunnel is set to S2, satisfying that S1 <S2。 7. The blocking device for the tunnel opening for shield tunneling according to claim 6 is characterized in that: The swing length of the folding flap (4) is set to m, satisfying, R 2 +L 2 >m 2 .

8. The blocking device for a tunnel opening for shield tunneling according to any one of claims 1 to 5, characterized in that: A fixing ring (7) is provided on the outer side of the outer peripheral fixing portion (31), and the folding flap (4) is hinged on the fixing ring (7).

9. The blocking device for the tunnel opening for shield tunneling according to claim 8 is characterized in that: The fixing ring (7) and the end face ring (2) are fixed to the side wall of the shield starting tunnel portal by means of bolts (8).

10. The blocking device for a tunnel opening for shield tunneling according to any one of claims 1 to 5, characterized in that: The flexible curtain cloth (3) is a rubber curtain cloth, and the inner hole ring (1) and the end face ring (2) are both steel rings.

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