Hinge sealing reinforcing structure of shield tunneling machine

Abstract

The utility model provides a hinged sealing reinforcing structure of a shield tunneling machine. The reinforcing structure is installed on the side, away from a second seal, of a thrust ring of a hinged seal, replaces an original thrust pressing ring of the hinged seal and comprises a first rubber sealing gasket, a second rubber sealing gasket and a thrust ring pressing plate, and installation grooves with L-shaped sections are formed in the plate faces of the two sides of the thrust ring pressing plate respectively. The thrust ring pressing plate is fixed to the end, located in the middle shield shell, of the shield tail shell through the second locking bolt, the first rubber sealing gasket is located between the thrust ring pressing plate and the thrust ring, and the second rubber sealing gasket is located on the end face, away from the thrust ring, of the thrust ring pressing plate. And the second rubber sealing gasket and the thrust ring pressing plate are fixedly locked through a locking bolt. The sealing effect of the hinge sealing damaged area is good, and compared with a traditional replacement mode, the construction period is shorter, the cost is lower, and the safety is higher.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the sealing device of shield machine, specifically a kind of shield machine hinged sealing reinforcing structure. BACKGROUND

[0002] For some risk, high difficulty, time limit requirement tight and long construction distance tunnel construction, shield machine is usually used for construction.Hinged sealing structure is the key structure of shield machine, hinged sealing is located in the hinged part of shield machine tail shield and middle shield, including two sealing rubber rings and grease cavity, mainly used for preventing the intrusion of mud or slag etc outside shield into equipment interior.

[0003] In the shield machine construction process, hinged sealing structure bears certain pressure, especially in the process of shield machine turning, the greater the turning angle, the greater the pressure that hinged sealing structure bears, in the actual construction process of shield machine, it is easy to cause hinged sealing structure failure, sealing damage or sealing gap wear too large etc due to external environmental pressure, hinged sealing is damaged or failure will make the silt in stratum into tunnel, and then induce gushing water and sand, tunnel is flooded safety risk, affect construction safety and project progress.

[0004] At present, aiming at the problem of hinged sealing damage or failure, the traditional processing mode is to replace hinged sealing, and the replacement of hinged sealing is complicated, there is the problem of long time limit and large cost;And sometimes, only one of sealing rubber ring appears damage, but it is not clear which one, and replacing it also can exist waste condition;There are also some projects that only part of area appears sealing damage, if overall replacement is carried out, it will also cause great waste. SUMMARY

[0005] The utility model provides a kind of shield machine hinged sealing reinforcing structure to the problems existing in prior art, the structure is enhanced sealing performance of damaged part by using processing rubber sealing pad and reforming processing thrust ring pressure ring, compared with traditional replacement mode, it has the advantages of shorter time limit, higher safety and lower cost.

[0006] In order to achieve the above technical purpose, the utility model provides a kind of shield machine hinged sealing reinforcing structure, for the hinged sealing between shield and shield tail in shield machine is reinforced, the hinged sealing includes the first sealing between middle shield shell and shield tail shell, second sealing and thrust ring, the reinforcing structure is installed in the side of thrust ring of hinged sealing away from second sealing, replaces the thrust pressure ring of original hinged sealing, the reinforcing structure includes first rubber gasket, second rubber gasket and thrust ring pressing plate, both side plate surfaces of the thrust ring pressing plate are respectively provided with first rubber pad installation groove and second rubber pad installation groove with section being L type, and the height of first rubber pad installation groove is greater than second rubber pad installation groove, first bolt hole is opened in the area of second rubber pad installation groove, and second bolt hole is provided in the area of thrust ring pressing plate without rubber pad installation groove;The end of shield tail shell in middle shield shell is fixed in the thrust ring pressing plate by second locking bolt, and first rubber pad installation groove is adjacent to the side of thrust ring, the first rubber gasket is located between thrust ring pressing plate and thrust ring, and part is embedded in first rubber pad installation groove, the second rubber gasket is located at the end face of thrust ring pressing plate away from thrust ring, and part is embedded in second rubber pad installation groove, and the first rubber gasket, thrust ring pressing plate and second rubber gasket are fixed and locked by first locking bolt.

[0007] The utility model more preferably technical scheme: first locking bolt adopts screw rod and nut, first gasket is provided between nut and second rubber gasket, the annular length of first gasket is consistent with the annular length of thrust ring pressing plate, and screw hole is opened on first gasket, and the screw rod of first locking bolt passes through nut, first gasket, second rubber gasket and the first bolt hole on thrust ring pressing plate in proper order, and is clamped with first rubber gasket.

[0008] The utility model more preferably technical scheme: thrust ring pressing plate is arc pressing plate, and the annular length and the radian of arc pressing plate are consistent with the annular length and the radian of single ring plate of thrust ring;First bolt hole and second bolt hole are each provided with a row, and bolt hole is equidistantly distributed along the annular length of thrust ring pressing plate.

[0009] The utility model more preferably technical scheme: second gasket is provided between the end of first locking bolt and first rubber gasket, and first gasket and second gasket are steel gasket.

[0010] The length of the thrust ring pressing plate is 0.4-0.6 m, and the thickness is 80-90 mm; the first rubber sealing gasket and the second rubber sealing gasket are both arc-shaped gaskets, the thickness of the first rubber sealing gasket is 30-35 mm, and the height is 60-65 mm, the thickness of the second rubber sealing gasket is 20-25 mm, and the height is 45-50 mm; the length and the arc of the first rubber sealing gasket and the second rubber sealing gasket are matched with the length of the thrust ring pressing plate.

[0011] The length of the thrust ring pressing plate is 0.4-0.6 m, and the thickness is 80-90 mm; the first rubber sealing gasket and the second rubber sealing gasket are both arc-shaped gaskets, the thickness of the first rubber sealing gasket is 30-35 mm, and the height is 60-65 mm, the thickness of the second rubber sealing gasket is 20-25 mm, and the height is 45-50 mm; the length and the arc of the first rubber sealing gasket and the second rubber sealing gasket are matched with the length of the thrust ring pressing plate.

[0012] The processing rubber sealing gasket and the processing thrust ring pressing ring mode enhance the sealing performance of the damaged area of the hinged sealing, and the application effect is good, compared with the traditional hinged sealing replacement mode, the construction period is shorter, the cost is lower, and the safety risk accidents such as water and sand gushing and tunnel flooding can be prevented, and the safety is higher. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is the sectional structure schematic view of the utility model;

[0014] Figure 2 is the plane schematic view of the thrust ring pressing plate in the utility model;

[0015] Figure 3 is Figure 2 AA sectional view.

[0016] In the drawing: 1 - first rubber sealing gasket, 2 - second rubber sealing gasket, 3 - thrust ring pressing plate, 300 - first rubber pad installation groove, 301 - second rubber pad installation groove, 302 - first bolt hole, 303 - second bolt hole, 4 - thrust ring, 5 - second sealing, 6 - middle shield shell, 7 - shield tail shell, 8 - first sealing, 9 - second locking bolt, 10 - first locking bolt, 11 - first gasket, 12 - second gasket. DETAILED DESCRIPTION

[0017] The utility model will be further described below in combination with the drawings and examples. Figures 1 to 3The drawings are drawn in a simplified manner, and are used only for the purpose of clarity and conciseness of the embodiments of the utility model. The technical solutions shown in the drawings below are specific schemes of the embodiments of the utility model, and are not intended to limit the scope of the claimed utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0018] In the description of the utility model, it is understood that the terms "upper", "lower", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the utility model product is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the utility model and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only used for differentiation, and cannot be understood as indicating or implying relative importance.

[0019] The embodiment provides a kind of articulated sealing reinforcing structure of shield machine, for the articulated sealing between the shield and shield tail in shield machine is reinforced, such as Figures 1 to 3As shown, the hinged seal includes a first seal 8, a second seal 5 and a thrust ring 4 located between the middle shield shell 6 and the shield tail shell 7. The thrust ring 4 is an annular structure formed by splicing multiple arc-shaped ring plates; the reinforcement structure is installed on the side of the thrust ring 4 of the hinged seal away from the second seal 5, replacing the thrust ring of the original hinged seal. The reinforcement structure includes a first rubber sealing gasket 1, a second rubber sealing gasket 2 and a thrust ring pressure plate 3. The two side surfaces of the thrust ring pressure plate 3 are respectively provided with a first rubber pad mounting groove 300 and a second rubber pad mounting groove 301 with an L-shaped cross-section, and the height of the first rubber pad mounting groove 300 is greater than the second rubber pad mounting groove 301. A first bolt hole 302 is provided in the 301 area, and a second bolt hole 303 is provided in the area where the thrust ring pressure plate 3 is not provided with the rubber pad mounting groove; the thrust ring pressure plate 3 is fixed to the end of the shield tail shell 7 located in the middle shield shell 6 by a second locking bolt 9, and the first rubber pad mounting groove 300 is adjacent to one side of the thrust ring 4, the first rubber sealing gasket 1 is located between the thrust ring pressure plate 3 and the thrust ring 4, and is partially embedded in the first rubber pad mounting groove 300, the second rubber sealing gasket 2 is located on the end surface of the thrust ring pressure plate 3 away from the thrust ring 4, and is partially embedded in the second rubber pad mounting groove 301, the first rubber sealing gasket 1, the thrust ring pressure plate 3 and the second rubber sealing gasket 2 are fixed and locked by a first locking bolt 10. The first locking bolt 10 utilizes a screw rod and a nut, with a first gasket 11 disposed between the nut and the second rubber gasket 2. The circumferential length of the first gasket 11 matches that of the thrust ring pressure plate 3, and corresponding screw holes are formed in the first gasket 11. The screw rod of the first locking bolt 10 sequentially passes through the nut, the first gasket 11, the second rubber gasket 2, and the first bolt hole 302 in the thrust ring pressure plate 3, and is secured to the first rubber gasket 1. A second gasket 12 is disposed between the end of the first locking bolt 10 and the first rubber gasket 1. Both the first gasket 11 and the second gasket 12 are made of steel.

[0020] like Figure 2 As shown, the thrust ring pressure plate 3 in the embodiment is an arc-shaped pressure plate, and its circumferential length and curvature are consistent with the circumferential length and curvature of the single ring plate constituting the thrust ring 4; the first bolt holes 302 and the second bolt holes 303 are each arranged in a row, and each row of bolt holes is equidistantly distributed along the circumferential length of the thrust ring pressure plate 3.

[0021] The embodiment is directed to a certain shield construction project. The project is a small radius left turn circular curve with a horizontal direction of only 400 m, a large longitudinal slope section with a downward slope of 28 ‰ in the vertical direction, and a tunneling process to keep the shield posture in a head-up and left turn trend. The right upper gap of the hinged ring is relatively small, which is easy to cause the hinged seal to be extruded by an outward force. At the same time, the shield is in a high water pressure (up to 4 bar) and a large buried depth of fine sand stratum. In order to prevent the stratum mud water pressure from being too large to penetrate the hinged seal, a sufficient amount of grease is injected during construction, which results in a relatively large pressure of the injected grease. The combined effect of the two reasons eventually causes the second hinged seal ring at the 12-1 point to be extruded to the outside and still cannot be reset after taking measures. The first seal ring is not clear about the degree of influence, and there is a safety risk of water and sand gushing in the tunnel caused by seal failure.

[0022] It has been confirmed through observation that the second hinged seal is leaking outside, and the project staff tests the first seal and confirms that the first seal is intact. However, if the hinged seal is not treated in time, there is a safety risk of water and sand gushing and the tunnel being flooded during continuous construction of the shield in a large buried depth, high water pressure, fine sand stratum, and small radius working condition. In the traditional case, when the hinged seal leaks outside and cannot be reset, the method of directly replacing the hinged seal is selected. If the hinged seal is to be replaced, the entire hinged seal needs to be replaced, but only the position of the eight thrust ring blocks at the 12-1 point of the project has a safety risk of seal failure. The overall replacement of the seal has a large cost and a long time. Before replacement, a series of measures need to be taken, such as advance synchronous grouting, selection of appropriate shutdown position, continuous twice grouting, application of water stop ring, injection of grease and polyurethane, which greatly increases the time, construction period and cost of seal replacement, and also faces a great safety risk in the replacement of the large buried depth, high water pressure, fine sand stratum. Therefore, the project uses the hinged seal reinforcing structure of the shield machine in the utility model to treat it.

[0023] The project sets eight thrust ring pressure plates at the 12-1 point, so eight sets of seal reinforcing structures need to be set to replace the eight thrust ring pressure plates. The eight sets of reinforcing structures are spliced into an integrated seal structure. Therefore, eight sets of reinforcing structures are processed, specifically including eight first rubber sealing pads 1 with a length of 0.45 m (consistent with the length of the pressure ring), a thickness of 30 mm and a height of 60 mm, and eight second rubber sealing pads 2 with a length of 0.45 m (consistent with the length of the pressure ring), a thickness of 20 mm and a height of 45 mm. At the same time, eight thrust ring pressure plates 3 are processed. The length of the thrust ring pressure plate 3 matches the length of the original thrust pressure plate, the overall width is 40 mm, and the height is 80 mm, such as Figure 1 and Figure 3A first rubber pad mounting groove 300 for mounting the first rubber sealing pad 1 is formed in the inner wall of the thrust ring pressing plate 3, the first rubber pad mounting groove 300 is 20mm wide and 50mm high; a second rubber pad mounting groove 301 for mounting the second rubber sealing pad 2 is formed in the outer wall of the thrust ring pressing plate 3, the second rubber pad mounting groove 301 is 10mm wide and 35mm high; the cross section of the first rubber pad mounting groove 300 and the second rubber pad mounting groove 301 is L-shaped, a row of first bolt holes 302 are annularly formed in the area of the thrust ring pressing plate 3 corresponding to the second rubber pad mounting groove 301, and a row of second bolt holes 303 are annularly formed in the lower part of the thrust ring pressing plate 3, and the second bolt holes 303 are arranged at positions not corresponding to the first rubber pad mounting groove 300 and the second rubber pad mounting groove 301.

[0024] The installation process of the shield machine hinged sealing reinforcing structure in the embodiment is as follows:

[0025] (1) Three original thrust ring pressing plates of the hinged sealing at the twelve o'clock to one o'clock position of the shield machine are removed, the extruded second hinged sealing 5 is inserted into the front end face of the thrust ring 4 by using a tool, the first rubber sealing pad 1 with a thickness of 30mm and a height of 60mm is installed between the thrust ring pressing plate 3 and the thrust ring 4 to form a reinforcing sealing, then the modified and processed thrust ring pressing plate 3 is installed, the first rubber pad mounting groove 300 in the inner wall of the thrust ring pressing plate 3 faces the first rubber sealing pad 1, and part of the first rubber sealing pad 1 is embedded in the first rubber pad mounting groove 300, at the same time, the second gasket 12 is installed at the contact surface between the first rubber sealing pad 1 and the thrust ring pressing plate 3, the length of the second gasket 12 matches the length of the thrust ring pressing plate 3, and the second locking bolt 9 at the bottom is tightened to fix the thrust ring pressing plate 3 in the shield tail shell 7.

[0026] (2) The remaining five original thrust ring pressing plates from eleven o'clock to two o'clock of the shield machine are removed in sections, the first rubber sealing pad 1 with a thickness of 30mm and a height of 60mm is installed between the thrust ring pressing plate 3 and the thrust ring 4 after removing each thrust ring pressing plate, and the modified and processed thrust ring pressing plate 3 is installed in the manner of step (1) and then the second locking bolt 9 at the bottom is tightened for fixation, and then the next block of removal and installation work is carried out.

[0027] (3) Then, the second rubber sealing pad 2 with a thickness of 20mm and a height of 45mm is added in the second rubber pad mounting groove 301 at the front end of the newly installed eight thrust ring pressing plates 3, and the sealing pad is attached to the inner arc surface of the middle shield tail part to form a reinforcing sealing.

[0028] (4) the square head bolt of the compression ring is replaced by the first locking bolt 10 composed of a screw rod and a nut, the second rubber sealing gasket 2 is fixed on the thrust ring compression plate 3, the second rubber sealing gasket 2 is compacted by the nut, a 5mm-thick first gasket 11 needs to be installed between the nut and the second rubber sealing gasket 2, and the circumferential length of the first gasket 11 is consistent with the length of the thrust ring compression plate 3.

[0029] According to the above scheme, the hinge sealing in the embodiment is enhanced, the sealing performance is good after pressure test, and there is no water leakage, mud leakage, slurry leakage and re-external leakage of the sealing gasket in the process of shield tunneling, and the application effect is good.

[0030] In the embodiment, the scheme of processing the rubber sealing gasket and reforming and processing the thrust ring compression ring to enhance the sealing performance of the damaged part is adopted, and compared with the traditional replacement method, the scheme has the advantages of shorter construction period, higher safety and lower cost. The disposal time of the hinge sealing enhanced by the scheme can be completed in 1-2 days, while the replacement process of the hinge sealing is more complicated, and it needs 1 week or even longer time, so that the scheme has shorter construction period, lower labor cost, construction cost and material cost, etc. At the same time, because the traditional replacement method has longer time and larger removal area, the probability of safety risk accidents during replacement in the fine sand stratum with large buried depth and high water pressure is greatly increased, and the scheme is relatively safer.

[0031] The above is only one embodiment of the utility model, which is described in detail, but it cannot be understood as a limitation on the scope of the utility model. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, some modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the appended claims.

Claims

1. A shield machine hinge seal reinforcement structure for reinforcing a hinge seal between a middle shield and a tail shield of a shield machine, wherein the hinge seal comprises a first seal (8), a second seal (5) and a thrust ring (4) located between a middle shield shell (6) and a tail shield shell (7), and is characterized in that: The reinforcing structure is installed on the side of the thrust ring (4) of the hinged seal away from the second seal (5), replacing the thrust ring of the original hinged seal, and the reinforcing structure includes a first rubber sealing pad (1), a second rubber sealing pad (2) and a thrust ring pressure plate (3), and the two side plate surfaces of the thrust ring pressure plate (3) are respectively provided with a first rubber pad installation groove (300) and a second rubber pad installation groove (301) with an L-shaped cross section, and the height of the first rubber pad installation groove (300) is greater than the second rubber pad installation groove (301), a first bolt hole (302) is provided in the area of ​​the second rubber pad installation groove (301), and a second bolt hole (303) is provided in the area of ​​the thrust ring pressure plate (3) where the rubber pad installation groove is not provided. hole (303); the thrust ring pressure plate (3) is fixed to the end of the shield tail shell (7) located in the middle shield shell (6) by the second locking bolt (9), and the first rubber pad installation groove (300) is adjacent to the side of the thrust ring (4); the first rubber sealing pad (1) is located between the thrust ring pressure plate (3) and the thrust ring (4), and is partially embedded in the first rubber pad installation groove (300); the second rubber sealing pad (2) is located on the end surface of the thrust ring pressure plate (3) away from the thrust ring (4), and is partially embedded in the second rubber pad installation groove (301); the first rubber sealing pad (1), the thrust ring pressure plate (3) and the second rubber sealing pad (2) are fixed and locked by the first locking bolt (10).

2. The shield machine hinged seal reinforcement structure according to claim 1, characterized in that: The first locking bolt (10) adopts a screw rod and a nut, and a first gasket (11) is provided between the nut and the second rubber sealing gasket (2). The circumferential length of the first gasket (11) is consistent with the circumferential length of the thrust ring pressure plate (3), and a corresponding screw hole is opened on the first gasket (11). The screw of the first locking bolt (10) passes through the nut, the first gasket (11), the second rubber sealing gasket (2) and the first bolt hole (302) on the thrust ring pressure plate (3) in sequence, and is clamped with the first rubber sealing gasket (1).

3. A shield machine hinged seal reinforcement structure according to claim 1 or 2, characterized in that: The thrust ring pressure plate (3) is an arc-shaped pressure plate, and its circumferential length and curvature are consistent with the circumferential length and curvature of the single ring plate constituting the thrust ring (4); the first bolt holes (302) and the second bolt holes (303) are each arranged in a row, and each row of bolt holes is equidistantly distributed along the circumferential length of the thrust ring pressure plate (3).

4. The shield machine hinged seal reinforcement structure according to claim 2, characterized in that: A second gasket (12) is provided between the end of the first locking bolt (10) and the first rubber sealing gasket (1); the first gasket (11) and the second gasket (12) are both steel gaskets.

5. The shield machine hinged seal reinforcement structure according to claim 3, characterized in that: The thrust ring pressure plate (3) has a length of 0.4 to 0.6 m and a thickness of 80 to 90 mm; the first rubber sealing pad (1) and the second rubber sealing pad (2) are both arc-shaped gaskets, the first rubber sealing pad (1) has a thickness of 30 to 35 mm and a height of 60 to 65 mm, and the second rubber sealing pad (2) has a thickness of 20 to 25 mm and a height of 45 to 50 mm; the length and curvature of the first rubber sealing pad (1) and the second rubber sealing pad (2) match the length of the thrust ring pressure plate (3).

6. The shield machine hinged seal reinforcement structure according to claim 3, characterized in that: The thickness of the first rubber sealing pad (1) is greater than the depth of the first rubber pad installation groove (300), and the height of the first rubber sealing pad (1) is greater than the height of the first rubber pad installation groove (300); the thickness of the second rubber sealing pad (2) is greater than the depth of the second rubber pad installation groove (301), and the height of the second rubber sealing pad (2) is greater than the height of the second rubber pad installation groove (301).

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