Waterproof structure for shield segment

Abstract

The utility model discloses a waterproof structure for shield segments, which relates to the technical field of shield tunnels, has the advantages of improving the sealing performance between adjacent shield segments and reducing water leakage into the tunnel, and is characterized in that two annular sealing grooves are formed in the circumferential direction of each shield segment; the two sealing grooves are distributed close to the inner side and the outer side of the shield segment correspondingly, annular rubber water stop strips are arranged in the two sealing grooves correspondingly, and water swelling water stop strips are arranged on the portions, close to the two sides of the rubber water stop strips distributed on the outer side of the shield segment, of the shield segment correspondingly. The water swelling strips are annular water swelling strips distributed in the circumferential direction of the outer wall of the shield segment, and the bolt holes for connecting the longitudinal shield segment are located between every two adjacent rubber water sealing strips.

Description

TECHNICAL FIELD

[0001] The utility model relates to a shield tunnel technical field, concretely is a waterproof structure for shield segment. BACKGROUND

[0002] In recent years, the subway traffic engineering of our country develops rapidly, and the requirement of tunnel engineering construction and construction technology level is higher and higher, and at present, the shield method is a kind of commonly used construction method in tunnel engineering.

[0003] The shield tunnel is formed by the structure of the field assembly of multiple prefabricated segments, and the segments are connected by bolts, in order to prevent underground water from leaking into the tunnel from the segment joint, the waterproof sealing pad is arranged near the outer side of the segment at the joint, but when the waterproof sealing pad leaks, the water flow may flow along the joint between the adjacent segments into the bolt hole into the tunnel.

[0004] Therefore, the applicant develops a new technical scheme in the actual production process to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] In view of the above technical deficiencies, the utility model provides a waterproof structure for shield segment, which has the advantages of increasing the sealing performance between adjacent shield segments and reducing water leakage into the tunnel.

[0006] To solve the above technical problems, the utility model adopts the following technical scheme:

[0007] The utility model provides a waterproof structure for shield segment, which comprises a plurality of mutually spliced shield segments, the shield segment is provided with a bolt hole, the bolt hole is provided with a connecting screw rod for splicing the shield segment and the adjacent shield segment, the both ends of the connecting screw rod are threaded out of the bolt hole and are both threadedly connected with a nut at the threaded end, the circumferential direction of each shield segment is provided with two annular sealing grooves, the two sealing grooves are respectively distributed close to the inner side and the outer side of the shield segment, the two sealing grooves are both provided with annular rubber waterstop, the shield segment is provided with water-swelling waterstop on the both sides of the rubber waterstop distributed close to the outer side of the shield segment, the water-swelling waterstop is also annular water-swelling waterstop distributed in the circumferential direction of the outer wall of the shield segment, and the bolt hole connecting the longitudinal shield segment is located between the two adjacent rubber waterstops.

[0008] By adopting the above technical scheme, the two rubber waterstops and the two water-swelling waterstops form multilayer sealing between the shield segment splicing joints, reduce the water leakage between the adjacent shield segments, increase the sealing performance between the adjacent shield segments, and reduce the water leakage into the tunnel.

[0009] Preferably, the shield segment is provided with waterproof protrusions extending towards the transversely adjacent shield segments, and the outer wall of the waterproof protrusions is provided with water-swelling sealing pads.

[0010] Preferably, the connecting screw rod is sleeved with a washer and a water-swelling rubber ring outside the outer wall of the bolt hole, the shield segment is provided with a placing groove for placing a nut, the placing groove is communicated with the bolt hole, and the nut of the connecting screw rod is abutted against the groove bottom of the placing groove through the washer and the water-swelling rubber ring.

[0011] Preferably, the longitudinal section of the water-swelling rubber ring is triangular, and the groove bottom of the placing groove is provided with a groove matched with the inclined side of the water-swelling rubber ring.

[0012] Preferably, when the nut is installed on the connecting screw rod, the shield segment is filled with a layer of sulphoaluminate expansive cement in the placing groove.

[0013] Preferably, the water-swelling rubber ring is replaced by a sealing ring, one end of the sealing ring is a straight cylinder type entering the placing groove and close to the bolt hole, the other end is a tapered type expanding outward, the placing groove is provided with a protective cover covering the nut, the protective cover is filled with a second layer of sulphoaluminate expansive cement, and the protective cover is provided with a grouting hole away from the placing groove.

[0014] Preferably, the inner wall of the protective cover is provided with spiral protrusions, and the inner wall of the protective cover is provided with irregular protrusions distributed in a staggered manner with the spiral protrusions.

[0015] The two rubber waterstop strips and the two water-swelling waterstop strips form multiple layers of sealing between the shield segment splicing joints, reduce water leakage between adjacent shield segments, increase the sealing performance between adjacent shield segments, and reduce water seepage into the tunnel. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0017] Figure 1 It is a structural schematic view for embodying the shield segment of the embodiment;

[0018] Figure 2 It is a structural schematic view for embodying the bolt hole of the embodiment;

[0019] Figure 3 It is a structural schematic view for embodying the first layer of sulphoaluminate expansive cement of the embodiment;

[0020] Figure 4 Structure diagram for embodying the second layer of sulphoaluminate expansive cement of the embodiment;

[0021] Figure 5 Structure diagram for embodying the protective cover of the embodiment;

[0022] Figure 6 Structure diagram for embodying the protective cover of the embodiment; Figure 5 Enlarged structure diagram of the middle A part.

[0023] Explanation of reference signs:

[0024] In the figure: 1, shield segment; 11, bolt hole; 12, connecting screw; 121, nut; 13, rubber waterstop; 131, water-swelling waterstop; 14, gasket; 141, water-swelling rubber ring; 142, placing groove; 143, groove; 144, first layer of sulphoaluminate expansive cement; 15, sealing ring; 151, protective cover; 152, second layer of sulphoaluminate expansive cement; 153, spiral protrusion; 154, convex point; 155, grouting hole. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] A waterproof structure for shield segments, like Figure 1 and Figure 2, including several mutually spliced shield segments 1, the shield segment 1 is provided with bolt holes 11, the bolt holes 11 are provided with connecting bolts 12 for splicing the shield segment 1 with adjacent shield segments 1, that is, the bolt holes 11 on adjacent shield segments 1 are communicated with each other, and the two ends of the connecting bolts 12 are both threaded through the bolt holes 11 on the adjacent shield segments 1, and threaded nuts 121 are threaded on the threaded ends, two annular sealing grooves are arranged in the circumferential direction of each shield segment 1, and the two sealing grooves are respectively arranged close to the inner side and the outer side of the shield segment 1, and annular rubber waterstop 13 is arranged in each sealing groove, and water-swelling waterstop 131 is arranged on both sides of the rubber waterstop 13 arranged close to the outer side of the shield segment 1, so as to strengthen the waterproof performance of the outer side of the adjacent shield segments 1, the water-swelling waterstop 131 is also an annular water-swelling waterstop 131 arranged in the circumferential direction of the outer wall of the shield segment 1, and the bolt holes 11 for connecting the longitudinal shield segments 1 are arranged between the two adjacent rubber waterstops 13. The longitudinal shield segments 1 refer to the shield segments 1 connected with each other along the length direction of the tunnel, and the transverse shield segments 1 refer to the shield segments 1 connected with each other along the annular distribution of the tunnel.

[0027] As Figure 1 and Figure 2 , the two rubber waterstops 13 and the two water-swelling waterstops 131 form a multi-layer sealing between the splicing joints of the shield segments 1, reduce the water leakage between the adjacent shield segments 1, increase the sealing performance between the adjacent shield segments 1, and reduce the water seepage into the tunnel.

[0028] The shield segment 1 is provided with a waterproof protrusion (not shown in the figure) extending to the direction of the transversely adjacent shield segment 1, and a water-swelling sealing gasket is arranged on the outer wall of the waterproof protrusion, so as to strengthen the connection strength of the transverse shield segments 1.

[0029] As Figure 2 and Figure 3 , the connecting bolts 12 are sleeved with a gasket 14 and a water-swelling rubber ring 141 on the outer wall of the bolt hole 11, the shield segment 1 is provided with a placing groove 142 for placing the threaded nut 121, the placing groove 142 is communicated with the bolt hole 11, the threaded nut 121 of the connecting bolt 12 is abutted against the bottom of the placing groove 142 through the gasket 14 and the water-swelling rubber ring 141, and at this time, the placing groove 142 is arranged so that the threaded nut 121 and the end of the connecting bolt 12 are both located in the placing groove 142. The water-swelling rubber ring 141 reduces the water entering the bolt hole 11 through the threaded nut 121 and then flowing out of the shield segment 1 through the bolt hole 11.

[0030] As Figure 2 and Figure 3, the longitudinal section of the water-swelling rubber ring 141 is triangular, and the groove bottom of the placing groove 142 is provided with a groove 143 matched with the inclined side of the water-swelling rubber ring 141. At this time, the contact area of the water-swelling rubber ring 141 and the placing groove 142 is increased, and the sealing performance is further improved.

[0031] As shown in Figure 2 and Figure 3 When the nut 121 is installed on the connecting screw rod 12, the shield segment 1 is filled with a layer of sulphoaluminate expansive cement 144 in the placing groove 142. The sulphoaluminate expansive cement layer 144 has low hydration heat and good impermeability, thereby limiting the water flow from the bolt hole 11 to the outside of the segment, and further into the tunnel.

[0032] As shown in Figure 4 and Figure 5 and Figure 6 Alternatively, the water-swelling rubber ring 141 is replaced by a sealing ring 15, one end of the sealing ring is a straight cylinder type entering the placing groove 142 and close to the bolt hole 11, and the other end is a tapered shape expanding outward. When the nut 121 is rotated, the nut 121 extrudes the gasket 14, the gasket 14 extrudes the sealing ring, so that the sealing ring seals the bolt hole 11, reduces the water entering the bolt hole 11, and the groove wall of the placing groove 142 is provided with a protective cover 151 covering the nut 121, the protective cover 151 is filled with a layer of sulphoaluminate expansive cement 152, and the end of the protective cover 151 away from the placing groove 142 is provided with a grouting hole 155, so as to facilitate the injection of sulphoaluminate expansive cement into the protective cover 151. After filling, the grouting hole 155 is tightly plugged by a rubber plug, and the sulphoaluminate expansive cement layer 152 further reduces the water flow from the bolt hole 11 to the shield segment 1. At this time, one end of the protective cover 151 is connected with the groove wall of the placing groove 142 by a bolt.

[0033] As shown in Figure 4 and Figure 5 and Figure 6 The inner wall of the protective cover 151 has a spiral protrusion 153, and the inner wall of the protective cover 151 is provided with irregular protrusions 154 distributed in a staggered manner with the spiral protrusion 153. At this time, the connection strength of the protective cover 151 and the sulphoaluminate expansive cement layer 152 is strengthened.

[0034] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A waterproof structure for shield segments, comprising a plurality of shield segments (1) spliced with each other, the shield segment (1) being provided with bolt holes (11), a connecting screw rod (12) being arranged in the bolt hole (11) to splice the shield segment (1) with an adjacent shield segment (1), both ends of the connecting screw rod (12) penetrating out of the bolt hole (11) and being threadedly connected with a nut (121) at the penetrating end, characterized in that: Two annular sealing grooves are arranged on the circumference of each shield segment (1), and the two sealing grooves are arranged close to the inner side and the outer side of the shield segment (1) respectively, and annular rubber waterstop (13) is arranged in each of the two sealing grooves, and water-swelling waterstop (131) is arranged on both sides of the rubber waterstop (13) arranged close to the outer side of the shield segment (1), and the water-swelling waterstop (131) is also annular water-swelling waterstop (131) arranged on the circumference of the outer wall of the shield segment (1), and the bolt hole (11) connecting the longitudinal shield segments (1) is located between the adjacent two rubber waterstops (13). ​ 2. The waterproof structure for a shield segment according to claim 1, wherein The shield segment (1) is provided with a waterproof protrusion extending to the direction of the transversely adjacent shield segment (1), and the outer wall of the waterproof protrusion is provided with a water-swelling sealing gasket.

3. The waterproof structure for a shield segment according to claim 1, wherein The connecting screw rod (12) is sleeved with a gasket (14) and a water-swelling rubber ring (141) on the outer wall of the bolt hole (11), the shield segment (1) is provided with a placing groove (142) for placing the nut (121), the placing groove (142) is communicated with the bolt hole (11), and the nut (121) of the connecting screw rod (12) abuts the water-swelling rubber ring (141) against the groove bottom of the placing groove (142) through the gasket (14).

4. The waterproof structure for a shield segment according to claim 3, wherein The longitudinal section of the water-swelling rubber ring (141) is triangular, and the groove bottom of the placing groove (142) is provided with a groove (143) matched with the inclined side of the water-swelling rubber ring (141).

5. A waterproof structure for a shield segment according to claim 4, wherein When the nut (121) is installed on the connecting screw rod (12), the shield segment (1) is filled with a layer of sulphoaluminate expansive cement (144) in the placing groove (142).

6. The waterproof structure for a shield segment according to claim 3, wherein The water-swelling rubber ring (141) is replaced by a sealing ring (15), one end of the sealing ring is a straight cylinder type entering the placing groove (142) and close to the bolt hole (11), and the other end is a tapered type expanding outward, a protective cover (151) covering the nut (121) is arranged on the groove wall of the placing groove (142), the protective cover (151) is filled with a layer of sulphoaluminate expansive cement (152), and a grouting hole (155) is arranged at the end of the protective cover (151) away from the placing groove (142).

7. A waterproof structure for a shield segment according to claim 6, wherein The inner wall of the protective cover (151) has a spiral protrusion (153), and the inner wall of the protective cover (151) is provided with irregular protrusions (154) distributed in a staggered manner with the spiral protrusion (153).

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