Shield tunnel sealing gasket waterproof test device and method considering tidal action of sea area

Abstract

The application provides a shield tunnel sealing gasket waterproof test device and method considering the tidal action of a sea area, and the device comprises the following: a C-shaped workbench; a sealing gasket clamping plate mechanism, comprising a top cover plate and two symmetrical T-shaped side plates, the top cover plate being covered above the T-shaped side plates; a groove for loading the sealing gasket being arranged on the mutually contacting wall surfaces of the top cover plate and the T-shaped side plates; a lateral displacement cyclic loading mechanism being fixed on the C-shaped workbench and used for cyclically increasing and decreasing the joint opening of the T-shaped side plates to simulate the reciprocating compression action of the tide on the joint; a water pressure loading mechanism being used for providing loading water pressure for the sealing gasket clamping plate mechanism; and a control mechanism being connected with the lateral displacement cyclic loading mechanism and the water pressure loading mechanism respectively. The application can simulate the waterproof performance of the joint sealing gasket under the combined action of the corrosion and the tide in the sea area.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of seabed shield tunnel engineering, in particular to a shield tunnel sealing pad waterproof test device and method considering the effect of tides in sea areas. BACKGROUND

[0002] Shield tunnel segments are mainly prefabricated in factories and then transported to the site for assembly. There are a large number of longitudinal and ring joints between the segments, and various forms of joints such as "straight joints" and "T-shaped joints" are formed between the joints. At present, with the continuous development of shield technology, more and more seabed shield tunnels are being built, and how to better test and study the waterproof performance of the segment sealing pad under the effect of tides in the corrosive environment of the sea area is attracting more and more attention.

[0003] The existing shield tunnel sealing pad waterproof performance test mainly tests the sealing performance of the sealing pad under a certain amount of opening and misalignment, but because the segments of the seabed shield tunnel are in a corrosive environment and long-term tidal action, the performance of the segment joint waterproof material is affected not only by the conventional deformation factors, but also by the adverse effects of the corrosive environment of the sea area and long-term tidal action. The existing test device and method have the disadvantage of being unable to simulate the working conditions of the corrosive environment of the sea area and long-term tidal action. SUMMARY

[0004] In view of the defects in the prior art, the purpose of the present application is to provide a shield tunnel sealing pad waterproof test device and method considering the effect of tides in sea areas.

[0005] According to one aspect of the present application, a shield tunnel sealing pad waterproof test device considering the effect of tides in sea areas is provided, which comprises:

[0006] a C-shaped workbench;

[0007] a sealing pad clamping plate mechanism arranged in the C-shaped opening of the C-shaped workbench; the sealing pad clamping plate mechanism comprises a top cover plate and two symmetrical T-shaped side plates, the top cover plate is arranged above the T-shaped side plates; the side surface formed by the top cover plate and the two T-shaped side plates forms a T-shaped joint; grooves for loading sealing pads are arranged on the mutually contacting wall surfaces of the top cover plate and the T-shaped side plates;

[0008] a lateral displacement cyclic loading mechanism fixed on the C-shaped workbench for cyclically increasing and decreasing the joint opening of the T-shaped side plates to simulate the reciprocating compression effect of tides on the joint;

[0009] a water pressure loading mechanism for providing loading water pressure to the sealing pad clamping plate mechanism;

[0010] a control mechanism connected with the lateral displacement cyclic loading mechanism and the water pressure loading mechanism, respectively.

[0011] Further, the lateral displacement cyclic loading mechanism comprises:

[0012] adjusting the opening amount of the oil cylinder, the force of which is applied to the side of the T-shaped side plate, so that the two T-shaped side plates are pressed to meet the set opening amount.

[0013] Further, the lateral displacement cyclic loading mechanism further comprises:

[0014] positive support, provided on the outside of the T-shaped side plate away from the C-shaped opening side wall;

[0015] lateral support, provided on the outside of the T-shaped side plate and perpendicular to the positive support.

[0016] Further, the C-shaped workbench is provided with a top loading mechanism on the top of the C-shaped opening, which applies a predetermined load to the top cover plate.

[0017] Further, the top loading mechanism comprises:

[0018] 4 top oil cylinders, evenly distributed on the top of the C-shaped opening;

[0019] a backing plate, provided below the top oil cylinder and connected to the 4 top oil cylinders respectively.

[0020] Further, the top cover plate is provided with a water inlet hole, and the water pressure loading mechanism comprises:

[0021] a water pressure pipeline, one end of which is in communication with the water inlet hole;

[0022] a water pressure oil cylinder, connected to the other end of the water pressure pipeline, the water pressure oil cylinder being connected to the control mechanism.

[0023] According to another aspect of the present application, a method for testing the waterproofness of a shield tunnel sealing pad considering the effect of sea tide is provided, which is realized by using the above device, comprising:

[0024] obtaining the stretching and shrinking deformation rule of the sealing pad before and after the effect of sea tide;

[0025] accelerating the aging of the sealing pad according to the corrosion environment conditions of the sea area;

[0026] pasting the accelerated aging sealing pad into the groove of the two T-shaped side plates and the top cover plate;

[0027] gradually loading to the predetermined water pressure by the water pressure loading mechanism;

[0028] According to the set requirements, the initial opening amount and the misalignment amount are adjusted, and based on the stretching and deformation law of the to-be-tested sealing gasket, the lateral displacement cyclic loading mechanism is used to reciprocatingly control the joint opening amount, the water leakage of the sealing gasket is observed, until the waterproof failure of the sealing gasket, the test is ended, and the waterproof performance parameter of the sealing gasket is obtained.

[0029] Further, according to the set requirements, the initial opening amount and the misalignment amount are adjusted, including:

[0030] Firstly, the misalignment amount oil cylinder is started to adjust the misalignment amount of the two T-shaped side plates, and the forward support is locked;

[0031] Then, the opening amount oil cylinder is started to adjust the opening amount of the two T-shaped side plates, and the vernier caliper is used to review the opening amount and the misalignment amount of the four sides, until the set requirements are met.

[0032] Further, based on the stretching and deformation law of the to-be-tested sealing gasket, the lateral displacement cyclic loading mechanism is used to reciprocatingly control the joint opening amount, including:

[0033] The opening amount oil cylinder is adjusted by the control mechanism, and the T-shaped side plate is automatically cyclically applied or removed with the joint opening amount.

[0034] Compared with the prior art, the present application has at least one of the following beneficial effects:

[0035] 1. The shield tunnel sealing gasket waterproof test device and method provided by the present application can simulate the fatigue effect of the sea tide on the sealing gasket material through the mutual cooperation between the lateral displacement cyclic loading mechanism, the control mechanism and the like, can obtain the influence of the tide effect on the waterproof performance of the shield tunnel joint sealing gasket, and each loading mechanism can be automatically controlled, which is convenient for test operation.

[0036] 2. The shield tunnel sealing gasket waterproof test device and method provided by the present application can realize the prediction of the waterproof performance of the segment joint sealing gasket by comprehensively considering the influence of the sea corrosion on the durability of the joint material and the influence of the sea tide on the deformation of the segment joint, and can more truly simulate the working condition of the sea tide environment on the waterproof performance of the segment joint sealing gasket. BRIEF DESCRIPTION OF DRAWINGS

[0037] Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, made with reference to the accompanying drawings:

[0038] Fig. 1 Fig. 1 is a perspective view of a shield tunnel sealing gasket waterproof test device according to an embodiment of the present application;

[0039] Fig. 2 Fig. 2 is a side view of a shield tunnel sealing gasket waterproof test device according to an embodiment of the present application;

[0040] Fig. 3 Figure 1 is a top view of a waterproof test device for a shield tunnel sealing gasket according to an embodiment of the present application;

[0041] In the figure: 1 is a C-shaped workbench, 2 is a T-shaped side plate, 3 is a top cover plate, 4 is a top oil cylinder, 5 is a pad, 6 is a lateral support, 7 is a lateral pushing rod, 8 is a water pressure oil cylinder, 9 is a control mechanism, 10 is an angle plate, 11 is a forward support, 12 is an oil cylinder for adjusting the amount of misalignment, and 13 is an oil cylinder for adjusting the amount of opening. DETAILED DESCRIPTION

[0042] The present application will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application. These are within the scope of the present application.

[0043] An embodiment of the present application provides a waterproof test device for a shield tunnel sealing gasket considering the effect of sea tides, which refers to Figs. 1-3 The device includes a C-shaped workbench 1, a sealing gasket clamping plate mechanism, a lateral displacement cyclic loading mechanism, a water pressure loading mechanism, and a control mechanism 9. The sealing gasket clamping plate mechanism is arranged in the C-shaped opening of the C-shaped workbench 1. The sealing gasket clamping plate mechanism includes a top cover plate 3 and two symmetrical T-shaped side plates 2, and the top cover plate 3 is overlaid on the T-shaped side plates 2. The side surface formed by the top cover plate 3 and the two T-shaped side plates 2 forms a T-shaped joint. Grooves for loading the sealing gasket are arranged on the mutually contacting wall surfaces of the top cover plate 3 and the T-shaped side plates 2. The lateral displacement cyclic loading mechanism is fixed on the C-shaped workbench 1 and is used to cyclically increase or decrease (apply or remove) the joint opening amount of the T-shaped side plates 2 to simulate the reciprocating compression effect of tides on the joint. The water pressure loading mechanism is used to provide loading water pressure for the sealing gasket clamping plate mechanism. The control mechanism 9 is connected with the lateral displacement cyclic loading mechanism and the water pressure loading mechanism, respectively.

[0044] The above embodiment, through the mutual cooperation between the lateral displacement cyclic loading mechanism, the control mechanism, etc., can simulate the fatigue effect of sea tides on the sealing gasket material, and can simulate the waterproof performance of the segment joint sealing gasket of the shield tunnel under the effect of sea tides, so as to achieve the working condition of simulating the waterproof performance of the joint sealing gasket under the effect of tides.

[0045] In some embodiments, the lateral displacement cyclic loading mechanism includes an adjustment misalignment amount oil cylinder 12 and an adjustment opening amount oil cylinder 13. The adjustment misalignment amount oil cylinder 12 is arranged at one end of the T-shaped side plate 2 in the length direction, and the force of the adjustment misalignment amount oil cylinder 12 is applied to one side of the T-shaped side plate 2, so that the two T-shaped side plates 2 produce a preset misalignment displacement of a misalignment amount. The adjustment opening amount oil cylinder 13 is arranged at one end of the T-shaped side plate 2 close to the C-shaped opening side wall in the width direction, and the adjustment opening amount oil cylinder 13 is arranged perpendicularly to the adjustment misalignment amount oil cylinder 12. The force of the adjustment opening amount oil cylinder 13 is applied to the side of the T-shaped side plate 2, so that the two T-shaped side plates 2 are pressed to meet the set opening amount. In the test process, a constant misalignment amount is generated by the adjustment misalignment amount oil cylinder 12, and the control mechanism 9 controls the cyclic loading and unloading of the adjustment opening amount oil cylinder 13, so as to realize the simulation of the tidal effect.

[0046] Further, the lateral displacement cyclic loading mechanism further includes a forward support 11 and a lateral support 6. The forward support 11 is arranged on the outside of the T-shaped side plate 2 away from the C-shaped opening side wall. The lateral support 6 is arranged on the outside of the T-shaped side plate 2 and is perpendicular to the forward support 11, as shown in FIG. 6, between the adjustment misalignment amount oil cylinder 12 and the T-shaped side plate 2. The forward support 11 and the lateral support 6 provide support forces for the T-shaped side plate 2, which are perpendicular to each other. Fig. 2

[0047] In some embodiments, the C-shaped workbench 1 is provided with a top loading mechanism at the top of the C-shaped opening, and a sealing gasket clamping plate mechanism is arranged below the top loading mechanism. The top loading mechanism applies a predetermined load to the top cover plate 3, and the top loading mechanism is connected with the control mechanism 9. The top loading mechanism applies an initial load (unchanged in the test process) to the sealing gasket. The C-shaped workbench 1 is welded by steel plates. The middle and lower parts of the C-shaped opening of the C-shaped workbench 1 provide a sealing gasket test operation platform, and the middle and upper parts provide a counterforce for the loading of the top oil cylinder 4. The top loading mechanism includes the top oil cylinder 4 and the gasket plate 5. The number of the top oil cylinder 4 is four, and the four top oil cylinders 4 are uniformly distributed on the top of the C-shaped opening. The top oil cylinder 4 is fixed to the top of the C-shaped opening by welding. The gasket plate 5 is arranged below the top oil cylinder 4 and is connected with the four top oil cylinders 4, respectively. The gasket plate 5 is used to apply a wedge-shaped deformation amount to the top cover plate 3. The top cover plate 3 and the T-shaped side plate 2 are all made of steel, and corresponding grooves of different depths and widths are engraved inside to facilitate the pasting of the sealing gasket. At the same time, the top cover plate 3 is provided with water inlet holes and air outlet holes. In order to further enhance the adaptability of the test device, one or two grooves and different groove spacings can be arranged inside the top cover plate 3 and the T-shaped side plate 2 to simulate the actual pipe piece setting of single and multiple sealing gaskets. Different groove spacings can simulate the setting spacings of multiple sealing gaskets of the actual pipe piece.

[0048] ​In some embodiments, a water inlet hole is formed on the top cover plate 3, and the water pressure loading mechanism comprises a water pressure pipeline (not shown in the figure) and a water pressure oil cylinder 8, one end of the water pressure pipeline is communicated with the water inlet hole, the water pressure oil cylinder 8 is connected with the other end of the water pressure pipeline for providing loading water pressure, and the water pressure oil cylinder 8 is connected with the control mechanism 9 to automatically load water pressure, so as to facilitate the test operation.

[0049] In some embodiments, the device further comprises a sliding rail (not shown in the figure) and a lateral pushing rod 7, the sliding rail is arranged at the bottom of the C-shaped opening, the sealing gasket clamping plate mechanism is arranged on the sliding rail, and the sealing gasket clamping plate mechanism is moved through the sliding rail to facilitate operation; one end of the lateral pushing rod 7 is connected with the sealing gasket clamping plate mechanism, and the sealing gasket clamping plate mechanism is pushed to move to the lower part of the top loading mechanism along the sliding rail. After the top cover plate 3 and the two T-shaped side plates 2 are assembled to form the sealing gasket clamping plate mechanism, the sealing gasket clamping plate mechanism can be pushed into the C-shaped workbench 1 along the sliding rail through the lateral pushing rod 7.

[0050] In some embodiments, a plurality of angle plates 10 for reinforcement are arranged at the lower part of the C-shaped workbench 1 to keep the C-shaped workbench 1 stable.

[0051] In the above embodiments, the test parameters can be set through the control mechanism 9 to realize automatic operation, avoid errors caused by manual operation, and obtain more reliable test data.

[0052] Another embodiment of the present application provides a shield tunnel sealing gasket waterproof test method considering the tidal effect of a sea area, which is realized by using the above device, and the method comprises the following steps:

[0053] S1, obtaining the expansion and contraction deformation law of the sealing gasket to be tested before and after the tidal effect; specifically, the influence law and value of the tidal effect on the deformation of the sealing gasket of the typical section of the shield tunnel joint are calculated;

[0054] S2, accelerating the aging of the sealing gasket to be tested according to the corrosion environment conditions of the sea area and in combination with the design service life; considering the accelerated aging, the waterproof capacity of the sealing gasket when reaching the service life of 100 years (or other years) can be simulated, so as to realize the prediction of the waterproof performance of the sealing gasket;

[0055] S3, pasting the sealing gasket after the accelerated aging into the grooves of the two T-shaped side plates and the top cover plate;

[0056] S4, gradually loading to the predetermined water pressure through the water pressure loading mechanism;

[0057] S5, adjusting the initial opening amount and the joint displacement according to the set requirements, and controlling the joint opening amount through the lateral displacement cyclic loading mechanism based on the expansion and contraction deformation law of the sealing gasket to be tested, observing the water leakage of the sealing gasket, until the waterproof failure of the sealing gasket, and the test is ended, so as to obtain the waterproof performance parameters of the sealing gasket.

[0058] In some embodiments, the initial opening amount and the misalignment amount are adjusted according to the set requirements, including: first, starting to adjust the misalignment amount oil cylinder to adjust the misalignment amount of the two T-shaped side plates, and locking the forward support; then, starting to adjust the opening amount oil cylinder to adjust the opening amount of the two T-shaped side plates, and using a vernier caliper to review the opening amount and the misalignment amount of the four sides until the set requirements are met.

[0059] In some embodiments, the opening amount of the joint is reciprocally controlled by the lateral displacement cyclic loading mechanism based on the stretching and contraction deformation law of the to-be-tested sealing gasket, including: adjusting the opening amount oil cylinder by the control mechanism to automatically cyclically apply or remove the opening amount of the joint to the T-shaped side plate.

[0060] In a specific embodiment, continuing to refer to Figs. 1-3 , the shield tunnel sealing gasket waterproof test method considering the tidal action of the sea area includes the following steps:

[0061] S1, simulate the corrosion aging of the joint sealing gasket according to the corrosion environment conditions of the sea area;

[0062] S2, simulate the deformation law of the joint sealing gasket under the action of the tide by using the water-soil coupling numerical method, and determine the stretching and contraction deformation law of the joint sealing gasket;

[0063] S3, after the rubber sealing gasket is corroded and aged according to the corrosion environment conditions of the sea area, it is pasted in the groove of the two T-shaped side plates 2 and the top cover plate 3, and the pasting work of the test sealing gasket is completed;

[0064] S4, start to adjust the misalignment amount oil cylinder to adjust the misalignment amount of the two T-shaped side plates 2, then lock the forward support 11 by bolts, then start to adjust the opening amount oil cylinder to adjust the opening amount of the two T-shaped side plates 2, and use a vernier caliper to review the opening amount and the misalignment amount of the four sides, and after meeting the requirements, the adjustment work of the opening amount and the misalignment amount is completed;

[0065] S5, start the top oil cylinder 4 to apply a predetermined load;

[0066] S6, after the water pressure pipeline is connected, start the water pressure oil cylinder 8 to load the water pressure step by step to a predetermined water pressure;

[0067] S7, according to the stretching and contraction amount obtained in step S2, automatically reciprocally control the opening amount, observe the water leakage of the sealing gasket, until the waterproof failure of the sealing gasket, the test is completed, and the waterproof performance parameters of the final sealing gasket are obtained.

[0068] In the above embodiments, the joint sealing gasket material is aged according to the use environment, and the number of times of loading and unloading the tide reciprocally until the leakage of water occurs is obtained by the test, so that the waterproof service life of the sealing gasket can be predicted. If it is greater than the preset years such as 100 years, it meets the design service life.

[0069] The shield tunnel sealing gasket waterproof test method provided by the above-mentioned embodiments of the present application can realize the prediction of the waterproof performance of the segment joint sealing gasket, and can more truly simulate the working condition of the influence of the sea tide environment on the waterproof performance of the segment joint sealing gasket, by comprehensively considering the influence of the corrosion of the sea area on the durability of the joint material and the influence of the sea tide on the deformation of the segment joint.

[0070] The specific embodiments of the present application are described above. It should be understood that the present application is not limited to the specific embodiments described above, and various modifications or changes can be made by those skilled in the art within the scope of the claims, which does not affect the essential content of the present application. The above-mentioned preferred features can be used in combination in the case of not conflicting with each other.

Claims

1. A shield tunnel gasket waterproof test device considering the tidal action of a sea area, characterized in that, The utility model relates to a kind of test device for sealing gasket, including: C-shaped workbench; Gasket clamp plate mechanism is located in the C-shaped opening of the C-shaped workbench;The gasket clamp plate mechanism includes top cover plate and two symmetrical T-shaped side plates, and the top cover plate is covered on the top of the T-shaped side plate;The side surface formed by the top cover plate and the two T-shaped side plates forms T-shaped gap;Groove for loading sealing gasket is provided on the wall surface of the top cover plate and the T-shaped side plate that contact each other; Lateral displacement cyclic loading mechanism is fixed on the C-shaped workbench, which is used to cyclically increase or decrease the gap of the T-shaped side plate to simulate the reciprocating compression effect of tide on the gap;The lateral displacement cyclic loading mechanism includes a gap-adjusting oil cylinder, and the force of the gap-adjusting oil cylinder is applied to the side surface of the T-shaped side plate, so that the two T-shaped side plates are pressed to meet the set gap. Water pressure loading mechanism is used to provide loading water pressure for the gasket clamp plate mechanism; Control mechanism is connected with the lateral displacement cyclic loading mechanism and the water pressure loading mechanism, respectively.

2. The shield tunnel gasket waterproof test device considering the tidal action of a sea area according to claim 1, characterized in that, The lateral displacement cyclic loading mechanism further includes: Forward support is provided on the outer side of the T-shaped side plate away from the side wall of the C-shaped opening; Lateral support is provided on the outer side of the T-shaped side plate and perpendicular to the forward support.

3. The shield tunnel gasket waterproof test device considering the tidal action of a sea area according to claim 1, characterized in that, The top of the C-shaped opening of the C-shaped workbench is provided with a top loading mechanism, and the top loading mechanism applies a predetermined load to the top cover plate.

4. The shield tunnel gasket waterproof test device considering the tidal action of a sea area according to claim 3, characterized in that, The top loading mechanism includes: Four top oil cylinders are uniformly distributed on the top of the C-shaped opening; A backing plate is provided below the top oil cylinders and connected with the four top oil cylinders, respectively.

5. The shield tunnel gasket waterproof test device considering the tidal action of a sea area according to claim 1, characterized in that, Water inlet hole is opened on the top cover plate, and the water pressure loading mechanism includes: Water pressure pipeline is in communication with the water inlet hole at one end; Water pressure oil cylinder is connected with the other end of the water pressure pipeline, and the water pressure oil cylinder is connected with the control mechanism.

6. A method for waterproof test of a shield tunnel sealing gasket considering the tidal action of a sea area, which is implemented by using the waterproof test device for the shield tunnel sealing gasket considering the tidal action of the sea area according to any one of claims 1-5, characterized in that, The utility model relates to a kind of test device for sealing gasket, including: Obtaining the expansion and contraction deformation law of the sealing gasket before and after the action of tide; Accelerated aging is carried out on the sealing gasket according to the corrosion environment conditions of sea area; The sealing gasket after accelerated aging is pasted in the groove of the two T-shaped side plates and the top cover plate; The predetermined water pressure is loaded step by step through the water pressure loading mechanism; According to the set requirements, the initial gap and the amount of misalignment are adjusted, and based on the expansion and contraction deformation law of the sealing gasket, the gap of the joint is reciprocally controlled through the lateral displacement cyclic loading mechanism, and the leakage of the sealing gasket is observed until the waterproof failure of the sealing gasket, and the test is ended to obtain the waterproof performance parameters of the sealing gasket.

7. The method for waterproof test of the shield tunnel sealing gasket considering the tidal action of the sea area according to claim 6, characterized in that, According to the set requirements, the initial gap and the amount of misalignment are adjusted, including: First, start the misalignment-adjusting oil cylinder to adjust the amount of misalignment of the two T-shaped side plates, and lock the forward support; Then, start the gap-adjusting oil cylinder to adjust the gap of the two T-shaped side plates, and use vernier caliper to check the gap and the amount of misalignment of four sides until the set requirements are met.

8. The method for waterproof test of the shield tunnel sealing gasket considering the tidal action of the sea area according to claim 6, characterized in that, Based on the expansion and contraction deformation law of the sealing gasket, the gap of the joint is reciprocally controlled through the lateral displacement cyclic loading mechanism, including: The gap-adjusting oil cylinder is adjusted through the control mechanism to automatically cyclically apply or remove the gap of the T-shaped side plate.

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