A shield tunnel pipe ring joint sealing structure and construction method thereof

Abstract

The present invention discloses a shield tunnel pipe ring joint sealing structure and a construction method thereof, wherein the sealing structure is arranged at a joint between a first pipe ring and a second pipe ring; the sealing structure comprises a first sealing pad and a second sealing pad arranged between the pipe ring joints, and the cross sections of the first sealing pad and the second sealing pad are both inverted L-shaped structures; the present invention forms a vertical waterproof layer by arranging two inverted L-shaped sealing pads at the pipe ring joints and extending the sealing vertical sections of the two sealing pads into the pipe ring joints; the sealing horizontal sections of the two sealing pads are vertically arranged at the exposed ends of the sealing vertical sections and are sealed and fixed together to form a horizontal waterproof layer perpendicular to the joint between the pipe rings, the waterproof layer has multiple waterproof capabilities, realizes multi-dimensional waterproofing, has a high overall deformation capability, effectively avoids damage caused by the dislocation or horizontal tension of the joint between the pipe rings, and has a high waterproof capability.

Description

Technical Field

[0001] The invention belongs to the technical field of shield tunnel engineering, and in particular relates to a shield tunnel pipe ring joint sealing structure and a construction method thereof. Background Art

[0002] At present, the construction of subway tunnels generally adopts the shield method. The shield tunnel segments are the main assembly components of the shield method. After the rings are formed, the annular joints formed between the rings are the weakest link in waterproofing. In order to prevent the water level outside the shield tunnel segments from causing leakage in the annular joints, the annular joints between the rings are usually waterproofed by assembling and extruding sealing grooves and sealing pads. However, under the vertical displacement and horizontal tension of the ground fissures, the joints between the shield tunnel rings that intersect with the ground fissures will be dislocated and tensioned. The tensioned joints will cause the contact stress between the contact gaskets to be too small, resulting in water seepage. The dislocated joints will cause the sealing pads and the sealing grooves to separate due to excessive friction, thereby causing the waterproofing failure of the joints between the rings.

[0003] Therefore, the traditional rubber sealing pad cross-sectional form and waterproofing ideas can no longer meet the engineering needs under ground fissure site conditions. According to the above analysis of the reasons for the failure of water-stopping in the joints between pipe rings, it is necessary to provide a new type of waterproof sealing pad cross-sectional form so that it can meet the vertical displacement and opening amount of the annular joints under the action of ground fissures, and improve the waterproof performance of the joints between pipe rings. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a shield tunnel pipe ring joint sealing structure and a construction method thereof, so as to solve the technical problem that the joints between the shield tunnel pipe rings are tensioned, resulting in too small contact stress on the contact surface between the sealing gaskets, thereby causing the waterproof failure of the joints between the pipe rings.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides a shield tunnel pipe ring joint sealing structure, wherein the sealing structure is arranged at the joint between a first pipe ring and a second pipe ring; the sealing structure comprises a first sealing pad and a second sealing pad arranged between the pipe ring joints, and the cross sections of the first sealing pad and the second sealing pad are both inverted L-shaped structures;

[0007] The first sealing gasket includes a first sealing horizontal section and a first sealing vertical section, the first sealing vertical section extends into the joint between the pipe rings; the first sealing horizontal section is vertically arranged at the exposed end of the first sealing vertical section and extends toward the outer side surface of the second pipe ring; the second sealing gasket includes a second sealing horizontal section and a second sealing vertical section, the second sealing vertical section extends into the joint between the pipe rings, and the second sealing horizontal section is vertically arranged at the exposed end of the second sealing vertical section;

[0008] One side of the first sealed vertical section is sealed and fixed to the seam end of the first pipe ring, the other side of the first sealed vertical section is sealed and fixed to one side of the second sealed vertical section, and the other side of the second sealed vertical section is sealed and fixed to the seam end of the second pipe ring; one side of the second sealed horizontal section is sealed and fixed to the outer side surface of the second pipe ring, and the other side is tightly fitted with the first sealed horizontal section.

[0009] Furthermore, it also includes an embedded stop bar; the embedded stop bar is arranged on the outer side surface of the second pipe ring and is arranged close to the second sealing horizontal section; a wedge-shaped opening is arranged on the side of the embedded stop bar, and the wedge-shaped opening is arranged close to the second sealing horizontal section; a wedge-shaped head is arranged at the extended end of the first sealing horizontal section, and the wedge-shaped head is extruded in the wedge-shaped opening.

[0010] Furthermore, the embedded stop bar is made of rubber material.

[0011] Furthermore, the exposed end of the first sealing vertical section extends to the outside of the first pipe ring, and the extension length of the exposed end of the first sealing vertical section is the same as the thickness of the second sealing horizontal section.

[0012] Furthermore, a first sealing gasket installation groove is provided at the joint end of the first pipe ring, the first sealing gasket installation groove is provided close to the outer side surface of the first pipe ring, and the first sealing vertical section is sealingly provided in the first sealing gasket installation groove;

[0013] A second sealing gasket installation groove is arranged at the joint end of the second pipe ring, the second sealing gasket installation groove is arranged close to the outer side surface of the second pipe ring, and the second sealing vertical section is sealingly arranged in the second sealing gasket installation groove.

[0014] Furthermore, the width of the first sealing gasket installation groove is smaller than the thickness of the first sealing vertical section; the width of the second sealing gasket installation groove is smaller than the thickness of the second sealing vertical section.

[0015] Furthermore, the first sealing gasket and the first pipe ring, the second sealing gasket and the second pipe ring, and the second sealing horizontal section and the embedded stop bar are all bonded and fixed with a resin-type environmentally friendly adhesive.

[0016] Furthermore, the first sealing gasket and the second sealing gasket are both made of EPDM rubber sealing gaskets.

[0017] The present invention also provides a construction method for a shield tunnel pipe ring joint sealing structure, comprising the following steps:

[0018] After the first pipe ring is installed, the first sealing gasket is installed at the joint end of the first pipe ring;

[0019] Install the second sealing gasket and embedded stop strip at the joint end of the second pipe ring;

[0020] The second pipe ring is hoisted to the preset installation position so that the second sealing horizontal section is closely fitted with the first sealing horizontal section, and the wedge-shaped head of the first sealing horizontal section is squeezed and arranged in the wedge-shaped opening of the embedded stop bar;

[0021] The second pipe ring is fixed, and the shield tunnel pipe ring joint sealing structure is installed.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The present invention provides a shield tunnel pipe ring joint sealing structure and a construction method thereof, wherein two inverted L-shaped sealing pads are arranged at the pipe ring joint, and a sealing vertical section is extended into the pipe ring joint to form a vertical waterproof layer; the sealing horizontal sections of the two sealing pads are vertically arranged at the exposed ends of the sealing vertical sections, and the sealing horizontal sections of the two sealing pads are sealed and fixed together to form a horizontal waterproof layer vertical to the joint between the pipe rings, which has multiple waterproof capabilities, realizes multi-dimensional waterproofing, has a high overall deformation ability, effectively avoids damage caused by dislocation or horizontal tensioning of the joint between the pipe rings, and has a high waterproof capability.

[0024] Furthermore, by setting up an embedded stop strip, the wedge-shaped head at the end of the sealing horizontal section of one of the sealing gaskets is squeezed and set in the wedge-shaped mouth of the embedded stop strip, and the sealing gaskets on adjacent pipe rings are connected to form a whole, thereby effectively improving the overall deformation capacity of the two sealing gaskets and greatly enhancing the waterproof ability of the sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the assembly structure of the shield tunnel pipe ring joint sealing structure of the present invention;

[0026] Figure 2 is a schematic diagram of the structure of the first sealing gasket in the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the second sealing gasket in the present invention.

[0028] Among them, 1 is the first pipe ring, 2 is the second pipe ring, 3 is the first sealing gasket, 4 is the second sealing gasket, 5 is the embedded stop bar; 31 is the first sealing horizontal section, 32 is the first sealing vertical section, 33 is the wedge-shaped head; 41 is the second sealing gasket horizontal section, 42 is the second sealing vertical section; 51 is the wedge-shaped mouth. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] As attached Figure 1-3As shown, the present invention provides a shield tunnel pipe ring joint sealing structure, which is arranged at the joint between the first pipe ring 1 and the second pipe ring 2; the sealing structure includes a first sealing gasket 3, a second sealing gasket 4 and an embedded retaining strip 5; the first sealing gasket 3 and the second sealing gasket 4 are both arranged in the joint between the first pipe ring 1 and the second pipe ring 2, and the first sealing gasket 3 and the second sealing gasket 4 are sealed and fixed together.

[0031] The first sealing gasket 3 includes a first sealing horizontal section 31 and a first sealing vertical section 32. One end of the first sealing vertical section 32 extends into the joint between the pipe rings, and the other end extends to the outside of the first pipe ring 1; one end of the first sealing horizontal section 31 is vertically fixed to the exposed end of the first sealing vertical section 32, and the other end of the first sealing horizontal section 31 extends toward the outer wall of the second pipe ring 2; preferably, the extension length of the exposed end of the first sealing vertical section 32 is the same as the thickness of the second sealing horizontal section 41.

[0032] The second sealing gasket 4 includes a second sealing horizontal section 41 and a second sealing vertical section 42. One end of the second sealing vertical section 42 extends into the joint between the pipe rings, and the other end extends to the outside of the second pipe ring 2. One end of the second sealing horizontal section 41 is vertically fixed to the exposed end of the second sealing vertical section 42, and the other end of the second sealing horizontal section 41 extends toward the outer wall of the second pipe ring 2.

[0033] One side of the first sealed vertical section 32 is sealed and fixed to the seam end of the first pipe ring 1, the other side of the first sealed vertical section 32 is sealed and fixed to one side of the second sealed vertical section 42, and the other side of the second sealed vertical section 42 is sealed and fixed to the seam end of the second pipe ring 2; one side of the second sealed horizontal section 41 is sealed and fixed to the outer side surface of the second pipe ring 3, and the other side is sealed and fixed to the extended end of the first sealed horizontal section 31.

[0034] The embedded retaining strip 5 is arranged on the outer side surface of the second pipe ring 2 and is arranged close to the second sealing horizontal section 41. The embedded retaining strip 5 is sealed and fixed to the end of the second sealing horizontal section 41. A wedge-shaped opening 51 is arranged on the side of the embedded retaining strip 5, and the wedge-shaped opening is arranged close to one side of the second sealing horizontal section 41. A wedge-shaped head 33 is arranged at the extended end of the first sealing horizontal section 31, and the wedge head 33 is extruded and arranged in the wedge-shaped opening 51.

[0035] In the present invention, a first sealing gasket installation groove is provided at the joint end of the first pipe ring 1, the first sealing gasket installation groove is arranged close to the outer wall surface of the first pipe ring 1, and the first sealing vertical section 32 is sealed in the first sealing gasket installation groove; a second sealing gasket installation groove is provided at the joint end of the second pipe ring 2, the second sealing gasket installation groove is arranged close to the outer wall surface of the second pipe ring 2, and the second sealing vertical section 42 is sealed in the second sealing gasket installation groove.

[0036] Among them, the width of the first sealing gasket installation groove is smaller than the thickness of the first sealing vertical section 32, and the width of the second sealing gasket installation groove is smaller than the thickness of the second sealing vertical section 42; by making the width of the first sealing gasket installation groove smaller than the thickness of the first sealing vertical section 32 and the width of the second sealing gasket installation groove smaller than the thickness of the second sealing vertical section 42, it is ensured that mutual extrusion is generated between the first sealing vertical section and the second sealing vertical section, thereby improving the sealing effect.

[0037] The first sealing gasket 3 and the first pipe ring 1, the second sealing gasket 4 and the second pipe ring 2, and the second sealing horizontal section 41 and the embedded strip 5 are all bonded and fixed with a resin-type environmentally friendly adhesive; the first sealing gasket 3 and the second sealing gasket 4 are both EPDM rubber sealing gaskets; the embedded strip 5 is a rubber strip; preferably, the rubber strip is made of EPDM rubber.

[0038] The structure and construction process of the shield tunnel pipe ring joint sealing structure described in the present invention are described in detail below.

[0039] The shield tunnel pipe ring joint sealing structure of the present invention comprises a first sealing pad 3 and a second sealing pad 4. The first sealing pad 3 is arranged at the joint end of the first pipe ring 1, and the cross-sectional structure of the first sealing pad 3 is an inverted L-shaped; the joint end of the first pipe ring 1 is provided with The shaped groove serves as the first sealing gasket installation groove, and the first sealing vertical section 32 of the first sealing gasket 3 is bonded and fixed in the first sealing gasket installation groove by a resin-type environmentally friendly adhesive.

[0040] The second sealing gasket 4 is arranged at the joint end of the second pipe ring 2, and the cross-sectional structure of the second sealing gasket 4 is an inverted L-shaped; The second sealing vertical section 42 of the second sealing gasket 4 is bonded and fixed in the second sealing gasket installation groove by a resin-type environmentally friendly adhesive.

[0041] The outer side surface of the second pipe ring 2 is provided with an embedded retaining strip 5, which is arranged close to the end of the second sealing horizontal section 41, and the side surface of the embedded retaining strip 5 is bonded and fixed to the end of the second sealing horizontal section 41 by a resin-type environmentally friendly adhesive.

[0042] The first sealing vertical section 32 of the first sealing gasket 3 extends to the outside of the first pipe ring 1, and the first sealing horizontal section 31 of the first sealing gasket 3 is vertically arranged at the exposed end of the first sealing vertical section 32; the extension length of the exposed end of the first sealing vertical section 32 is the same as the thickness of the second sealing horizontal section 41.

[0043] The extended end of the first sealing horizontal section 31 extends toward the second pipe ring 2 to the embedded stop bar 5. A wedge-shaped opening 51 is provided on the side of the embedded stop bar 5. A wedge-shaped head 33 is provided at the extended end of the first sealing horizontal section 31. The wedge-shaped opening on the embedded stop bar 5 is used to make the first sealing horizontal section 31 and the second sealing horizontal section 41 produce a mutual squeezing force to form an integral structure.

[0044] The first sealing pad 3, the second sealing pad 4 and the embedded retaining strip 5 are all made of EPDM rubber material; after the first pipe ring 1 and the second pipe ring 2 are assembled, the first sealing pad 3, the second sealing pad 4 and the embedded retaining strip 5 form a multi-dimensional inverted L-shaped sealing structure at the pipe ring joint; wherein, a horizontal waterproof layer is formed on the outside perpendicular to the pipe ring joint, and a vertical waterproof layer is formed in the pipe ring joint.

[0045] Construction method:

[0046] A construction method of a shield tunnel pipe ring joint sealing structure according to the present invention comprises the following steps:

[0047] After the first pipe ring is installed, the first sealing gasket is installed at the joint end of the first pipe ring;

[0048] Install the second sealing gasket and embedded stop strip at the joint end of the second pipe ring;

[0049] The second pipe ring is hoisted to the preset installation position so that the second sealing horizontal section is closely fitted with the first sealing horizontal section, and the wedge-shaped head of the first sealing horizontal section is squeezed and arranged in the wedge-shaped opening of the embedded stop bar;

[0050] The second pipe ring is fixed, and the shield tunnel pipe ring joint sealing structure is installed.

[0051] The shield tunnel pipe ring joint sealing structure and construction method described in the present invention, through a pair of tightly fitted inverted L-section sealing pads and embedded retaining strips on the outside of the pipe ring joint, form a horizontal waterproof layer perpendicular to the pipe ring joint and a vertical waterproof layer in the pipe ring joint, forming a multi-dimensional waterproof structure with multiple waterproof capabilities, fundamentally solving the waterproof problem; using the embedded retaining strip to connect the two sealing pads to form a whole, effectively improving the overall deformation capacity of the sealing structure, and preventing water-stopping damage caused by the displacement and horizontal tension of the pipe ring joint; the sealing structure in the present invention is used to achieve the sealing of the pipe ring joint of the shield tunnel, and the multi-layered inverted L-shaped sealing structure on the outside of the pipe ring joint has a multi-dimensional waterproof capability, so that it can prevent the sealing pad contact surface stress from decreasing under the action of ground fissures and the sealing pad and the sealing groove from separating due to excessive friction, thereby avoiding water seepage at the pipe ring joint, which has important practical significance.

[0052] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A shield tunnel pipe ring joint sealing structure, characterized in that: The sealing structure is arranged at the joint between the first pipe ring (1) and the second pipe ring (2); the sealing structure comprises a first sealing pad (3) and a second sealing pad (4) arranged between the pipe ring joints, and the cross-sections of the first sealing pad (3) and the second sealing pad (4) are both inverted L-shaped structures; The first sealing gasket (3) comprises a first sealing horizontal section (31) and a first sealing vertical section (32), the first sealing vertical section (32) extending into the joint between the pipe rings; the first sealing horizontal section (31) is vertically arranged at the exposed end of the first sealing vertical section (32) and extends toward the outer side surface of the second pipe ring (2); the second sealing gasket (4) comprises a second sealing horizontal section (41) and a second sealing vertical section (42), the second sealing vertical section (42) extending into the joint between the pipe rings, the second sealing horizontal section (41) is vertically arranged at the exposed end of the second sealing vertical section (42); One side of the first sealing vertical section (32) is sealed and fixed to the joint end of the first pipe ring (1), the other side of the first sealing vertical section (32) is sealed and fixed to one side of the second sealing vertical section (42), and the other side of the second sealing vertical section (42) is sealed and fixed to the joint end of the second pipe ring (2); one side of the second sealing horizontal section (41) is sealed and fixed to the outer side surface of the second pipe ring (2), and the other side is tightly fitted to the first sealing horizontal section (31); It also includes an embedded stop bar (5); the embedded stop bar (5) is arranged on the outer side surface of the second pipe ring (2) and is arranged close to the second sealing horizontal section (41); a wedge-shaped opening (51) is arranged on the side surface of the embedded stop bar (5), and the wedge-shaped opening (51) is arranged close to the second sealing horizontal section (41); a wedge-shaped head (33) is arranged at the extended end of the first sealing horizontal section (31), and the wedge-shaped head (33) is squeezed and arranged in the wedge-shaped opening (51); The exposed end of the first sealing vertical section (32) extends to the outside of the first pipe ring (1), and the extension length of the exposed end of the first sealing vertical section (32) is the same as the thickness of the second sealing horizontal section (41).

2. A shield tunnel pipe ring joint sealing structure according to claim 1, characterized in that: The embedded stop bar (5) is made of rubber.

3. A shield tunnel pipe ring joint sealing structure according to claim 1, characterized in that: A first sealing gasket installation groove is provided at the joint end of the first pipe ring (1), the first sealing gasket installation groove is provided close to the outer side surface of the first pipe ring (1), and the first sealing vertical section (32) is sealingly provided in the first sealing gasket installation groove; A second sealing gasket installation groove is provided at the joint end of the second pipe ring (2), the second sealing gasket installation groove is provided close to the outer side surface of the second pipe ring (2), and the second sealing vertical section (42) is sealingly provided in the second sealing gasket installation groove.

4. A shield tunnel pipe ring joint sealing structure according to claim 3, characterized in that: The width of the first sealing gasket installation groove is smaller than the thickness of the first sealing vertical section (32); and the width of the second sealing gasket installation groove is smaller than the thickness of the second sealing vertical section (42).

5. The shield tunnel pipe ring joint sealing structure according to claim 1, characterized in that: The first sealing pad (3) and the first pipe ring (1), the second sealing pad (4) and the second pipe ring (2), and the second sealing horizontal section (41) and the embedded stop bar (5) are all bonded and fixed using a resin-type environmentally friendly adhesive.

6. The shield tunnel pipe ring joint sealing structure according to claim 1, characterized in that: The first sealing gasket (3) and the second sealing gasket (4) are both made of EPDM rubber sealing gaskets.

7. The construction method of a shield tunnel pipe ring joint sealing structure according to claim 1, characterized in that: The following steps are involved: After the first pipe ring is installed, the first sealing gasket is installed at the joint end of the first pipe ring; Install the second sealing gasket and embedded stop strip at the joint end of the second pipe ring; The second pipe ring is hoisted to the preset installation position so that the second sealing horizontal section is closely fitted with the first sealing horizontal section, and the wedge-shaped head of the first sealing horizontal section is squeezed and arranged in the wedge-shaped opening of the embedded stop bar; The second pipe ring is fixed, and the shield tunnel pipe ring joint sealing structure is installed.

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