阅读说明：本技术 一种验证充气式围堰密封性能的试验装置及方法 (Test device and method for verifying sealing performance of inflatable cofferdam ) 是由 彭峰 周亮 范伟丰 孟维民 陈红卫 齐春 李熠 于祥龙 于 2020-07-01 设计创作，主要内容包括：本发明公开了一种验证充气式围堰密封性能的试验装置及方法,它包括支撑台架、密封闸板、卡位板及调压机构,支撑台架包括若干不锈钢覆层,不锈钢覆层分为底面钢覆层、钢覆层过渡段及立面钢覆层,钢覆层过渡段前后两端分别与立面钢覆层和底面钢覆层焊接连接。其有益效果在于：试验装置提供了模拟换料水池不锈钢覆面的台架,满足换料水池充气式围堰的现场工作条件。通过操作调压机构,在密封性试验时可以调节充气式围堰配套密封气囊的密封比压。试验方法可以确定充气式围堰配套密封气囊的临界密封压力值。试验方法可以同时验证充气式围堰配套的密封气囊和组合式挡水板间密封条的密封性能。试验装置结构简单,加工方便,实用性较强。(The invention discloses a test device and a method for verifying the sealing performance of an inflatable cofferdam, and the test device comprises a support rack, a sealing flashboard, a clamping plate and a pressure regulating mechanism, wherein the support rack comprises a plurality of stainless steel coating layers, the stainless steel coating layers are divided into a bottom steel coating layer, a steel coating layer transition section and a vertical steel coating layer, and the front end and the rear end of the steel coating layer transition section are respectively welded with the vertical steel coating layer and the bottom steel coating layer. The beneficial effects are that: the test device provides a rack for simulating the stainless steel covering surface of the refueling water pool, and the field working condition of the inflatable cofferdam of the refueling water pool is met. By operating the pressure regulating mechanism, the sealing specific pressure of the sealing air bag matched with the inflatable cofferdam can be regulated during the sealing test. The test method can determine the critical sealing pressure value of the sealing air bag matched with the inflatable cofferdam. The test method can simultaneously verify the sealing performance of the sealing air bag matched with the inflatable cofferdam and the sealing strip between the combined type water retaining plates. The testing device is simple in structure, convenient to process and high in practicability.)

1. The utility model provides a test device of verification inflatable cofferdam sealing performance which characterized in that: the supporting rack comprises a plurality of stainless steel coating layers, the stainless steel coating layers are divided into a bottom surface steel coating layer, a steel coating layer transition section and a vertical surface steel coating layer, and the front end and the rear end of the steel coating layer transition section are respectively in welded connection with the vertical surface steel coating layer and the bottom surface steel coating layer.

2. The testing apparatus for verifying the sealing performance of an inflatable cofferdam as recited in claim 1, wherein: the whole support rack is of a U-shaped frame structure, the length of the support rack is the same as the span of the refueling water pool, and the support rack simulates the stainless steel covering surface of the refueling water pool for the whole test device.

3. The testing apparatus for verifying the sealing performance of an inflatable cofferdam as recited in claim 1, wherein: one side of the support rack is provided with a sealing flashboard, and two ends of the sealing flashboard are fixedly connected to the stainless steel coating through bolts.

4. The testing apparatus for verifying the sealing performance of an inflatable cofferdam as recited in claim 3, wherein: the sealing flashboard is of a rectangular plate-shaped structure, and the whole length of the sealing flashboard is matched with that of the supporting rack.

5. The testing apparatus for verifying the sealing performance of an inflatable cofferdam as recited in claim 3, wherein: the periphery of the sealing flashboard is provided with a sealing pressing strip, and the sealing pressing strip is pressed tightly through angle steel and used for compensating a gap at the joint of the sealing flashboard and the supporting rack.

6. The testing apparatus for verifying the sealing performance of an inflatable cofferdam as recited in claim 3, wherein: two sides of the sealing flashboard are provided with two clamping plates with plate-shaped structures, the clamping plates are connected with the sealing flashboard in a welding mode, and the middle of each clamping plate is provided with a U-shaped clamping groove.

7. The testing apparatus for verifying the sealing performance of an inflatable cofferdam as recited in claim 1, wherein: the pressure regulating mechanism is arranged between the inflatable cofferdam and the sealing flashboard and used for regulating the sealing specific pressure of the sealing air bag of the inflatable cofferdam during the test.

8. The testing apparatus for verifying the sealing performance of an inflatable cofferdam as recited in claim 1, wherein: the pressure regulating mechanism comprises a hand wheel, a lead screw, a pressing piece, a clamping pin pressing plate and a base, and the pressure regulating mechanism is supported on the supporting rack through the base.

9. The testing apparatus for verifying the sealing performance of an inflatable cofferdam as recited in claim 8, wherein: the head of the lower pressing piece is provided with a groove structure matched with the inflatable cofferdam in size for being sleeved at the upper end of the inflatable cofferdam, the hand wheel is fixed at the top end of the lead screw through a key and a nut and is used for driving the lead screw to rotate, and the lead screw can rotate the horizontal direction of the hand wheel to be converted into the up-and-down motion of the lower pressing piece.

10. A test method for verifying the sealing performance of an inflatable cofferdam is characterized by comprising the following steps:

(1) and (3) completing an air tightness test: the inflatable cofferdam sealing air bag is connected with an air inlet pipeline and a pressure gauge, after compressed air with certain pressure is slowly filled, the pressure is maintained for ten minutes, then the sealing air bag is completely immersed in water, and the air tightness of the sealing air bag is checked;

(2) the assembly of the pressure regulating mechanism is completed, and a hand wheel, a lead screw, a lower pressing piece, a limiting nut, a lead screw nut, a clamping pin pressing plate and a base are assembled into a complete pressure regulating mechanism;

(3) installing the sealing flashboard, the inflatable cofferdam and the pressure regulating mechanism on the supporting rack, so that the sealing flashboard, the supporting rack and the inflatable cofferdam form a sealed and reliable closed space together;

(4) and (3) finishing a critical sealing test, and determining a critical sealing pressure value and a normal working pressure value: slowly filling compressed air with a certain pressure into the inflatable cofferdam sealing air bag, filling water level of 0.3-0.5 m into the closed space step by step, observing the sealing condition of the inflatable cofferdam, and if no leakage phenomenon exists, reducing 10% of the initial air pressure value, and continuing to observe. Analogizing in sequence until the inflatable cofferdam leaks, taking the air pressure value of the last test as the critical sealing pressure value under the corresponding water level, and calculating the normal working pressure value of the corresponding water level according to the safety margin of 1.2 times;

(5) and (3) finishing a long-acting sealing test: keeping the pressure of the inflatable cofferdam for twenty-four hours at the water level of 0.3-0.5 m and under the normal working pressure, and checking the long-acting sealing property of the inflatable cofferdam;

(6) completing the high-pressure strength test: slowly filling compressed air which is 2 to 4 times of the normal working pressure value into the inflatable cofferdam sealing air bag step by step, filling water level of 0.3 to 0.5 meter into the closed space, checking the sealing condition of the inflatable cofferdam, maintaining the pressure for two hours, and checking the structural integrity of the sealing air bag and the inflatable cofferdam body under the high-pressure working condition.

Technical Field

The invention belongs to the field of nuclear power station maintenance, and particularly relates to a test device and a test method for verifying sealing performance of an inflatable cofferdam.

Background

The sealing boundary of the inflatable cofferdam of the refueling pool of the pressurized water reactor nuclear power station is formed by a sealing air bag and a sealing strip between combined water baffle plates, and effective isolation is formed on the stainless steel covering surface of the refueling pool. Be equipped with the two active rubber seal strips of P non-of mechanical extrusion formula between the combination formula breakwater of inflatable cofferdam, the design has the special clamp plate of installation sealing strip, and the sealing strip inlays in the clamp plate bottom, seals through hinge and hinge fastening connection. The frame department that inflatable cofferdam and reloading pond stainless steel clad surface contacted is equipped with the recess, and sealed gasbag installation is fixed in the recess. The total length of the inflatable cofferdam is smaller than the minimum span of the stainless steel covering surface of the refueling water pool, the gap is expanded and deformed by the sealing air bag under the action of air pressure, and effective compensation is realized after the sealing air bag and the stainless steel covering surface of the refueling water pool form extrusion, and the sealing air bag comprises a wavy concave-convex surface of the stainless steel covering surface, a through welding line, a transition fillet and the like, so that reliable sealing is formed.

In order to ensure that the inflatable cofferdam realizes the function of sealing and isolating the stainless steel covering surface of the refueling water pool, the sealing structure formed by the sealing air bag and the sealing strip between the combined type water baffle plates is a key element, a set of test device and a method for verifying the sealing performance of the inflatable cofferdam are technically required to be provided, and the sealing structure and the sealing performance can be verified and optimized by simulating the field use working condition of the inflatable cofferdam.

Disclosure of Invention

The invention aims to provide a test device and a method for verifying the sealing performance of an inflatable cofferdam, which can meet the field working conditions of the inflatable cofferdam of a refueling pool of a pressurized water reactor nuclear power station and carry out a sealing test on the inflatable cofferdam so as to verify and optimize the sealing structure and the sealing performance.

The technical scheme of the invention is as follows: the utility model provides a test device of verification inflatable cofferdam sealing performance, it includes support rack, sealed flashboard, screens board and pressure regulating mechanism, and the support rack includes a plurality of stainless steel coating, and the stainless steel coating divide into bottom surface steel coating, steel coating changeover portion and facade steel coating, both ends respectively with facade steel coating and bottom surface steel coating welded connection around the steel coating changeover portion.

The whole support rack is of a U-shaped frame structure, the length of the support rack is the same as the span of the refueling water pool, and the support rack simulates the stainless steel covering surface of the refueling water pool for the whole test device.

One side of the support rack is provided with a sealing flashboard, and two ends of the sealing flashboard are fixedly connected to the stainless steel coating through bolts.

The sealing flashboard is of a rectangular plate-shaped structure, and the whole length of the sealing flashboard is matched with that of the supporting rack.

The periphery of the sealing flashboard is provided with a sealing pressing strip, and the sealing pressing strip is pressed tightly through angle steel and used for compensating a gap at the joint of the sealing flashboard and the supporting rack.

Two sides of the sealing flashboard are provided with two clamping plates with plate-shaped structures, the clamping plates are connected with the sealing flashboard in a welding mode, and the middle of each clamping plate is provided with a U-shaped clamping groove.

The pressure regulating mechanism is arranged between the inflatable cofferdam and the sealing flashboard and used for regulating the sealing specific pressure of the sealing air bag of the inflatable cofferdam during the test.

The pressure regulating mechanism comprises a hand wheel, a lead screw, a pressing piece, a clamping pin pressing plate and a base, and the pressure regulating mechanism is supported on the supporting rack through the base.

The head of the lower pressing piece is provided with a groove structure matched with the inflatable cofferdam in size for being sleeved at the upper end of the inflatable cofferdam, the hand wheel is fixed at the top end of the lead screw through a key and a nut and is used for driving the lead screw to rotate, and the lead screw can rotate the horizontal direction of the hand wheel to be converted into the up-and-down motion of the lower pressing piece.

A test method for verifying the sealing performance of an inflatable cofferdam comprises the following steps:

(1) and (3) completing an air tightness test: the inflatable cofferdam sealing air bag is connected with an air inlet pipeline and a pressure gauge, after compressed air with certain pressure is slowly filled, the pressure is maintained for ten minutes, then the sealing air bag is completely immersed in water, and the air tightness of the sealing air bag is checked;

(2) the assembly of the pressure regulating mechanism is completed, and a hand wheel, a lead screw, a lower pressing piece, a limiting nut, a lead screw nut, a clamping pin pressing plate and a base are assembled into a complete pressure regulating mechanism;

(3) installing the sealing flashboard, the inflatable cofferdam and the pressure regulating mechanism on the supporting rack, so that the sealing flashboard, the supporting rack and the inflatable cofferdam form a sealed and reliable closed space together;

(4) and (3) finishing a critical sealing test, and determining a critical sealing pressure value and a normal working pressure value: slowly filling compressed air with a certain pressure into the inflatable cofferdam sealing air bag, filling water level of 0.3-0.5 m into the closed space step by step, observing the sealing condition of the inflatable cofferdam, and if no leakage phenomenon exists, reducing 10% of the initial air pressure value, and continuing to observe. Analogizing in sequence until the inflatable cofferdam leaks, taking the air pressure value of the last test as the critical sealing pressure value under the corresponding water level, and calculating the normal working pressure value of the corresponding water level according to the safety margin of 1.2 times;

(5) and (3) finishing a long-acting sealing test: keeping the pressure of the inflatable cofferdam for twenty-four hours at the water level of 0.3-0.5 m and under the normal working pressure, and checking the long-acting sealing property of the inflatable cofferdam;

(6) completing the high-pressure strength test: slowly filling compressed air which is 2 to 4 times of the normal working pressure value into the inflatable cofferdam sealing air bag step by step, filling water level of 0.3 to 0.5 meter into the closed space, checking the sealing condition of the inflatable cofferdam, maintaining the pressure for two hours, and checking the structural integrity of the sealing air bag and the inflatable cofferdam body under the high-pressure working condition.

The invention has the beneficial effects that:

(1) the test device provides a rack for simulating the stainless steel covering surface of the refueling water pool, and the field working condition of the inflatable cofferdam of the refueling water pool is met.

(2) By operating the pressure regulating mechanism, the sealing specific pressure of the sealing air bag matched with the inflatable cofferdam can be regulated during the sealing test.

(3) The test method can determine the critical sealing pressure value of the sealing air bag matched with the inflatable cofferdam.

(4) The test method can simultaneously verify the sealing performance of the sealing air bag matched with the inflatable cofferdam and the sealing strip between the combined type water retaining plates.

(5) The testing device is simple in structure, convenient to process and high in practicability.

Drawings

FIG. 1 is a schematic view of a testing apparatus for verifying the sealing performance of an inflatable cofferdam according to the present invention;

FIG. 2 is a left side view of a sealing gate plate and a clamping plate of the testing device for verifying the sealing performance of the inflatable cofferdam provided by the invention;

fig. 3 is a schematic structural view of a pressure regulating mechanism of a test apparatus for verifying the sealing performance of an inflatable cofferdam provided by the invention.

In the figure, 1 an inflatable cofferdam, 2 a supporting bench, 3 a sealing flashboard, 4 a pressure regulating mechanism, 5 a bottom steel coating, 6 a steel coating transition section, 7 a vertical steel coating, 8 a clamping plate, 9 a sealing pressing strip, 10 a hand wheel, 11 a lead screw, 12 a pressing piece, 13 a limiting nut, 14 a lead screw nut, 15 a clamping pin pressing plate and 16 a base.

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

The invention adopts a U-shaped frame as a rack, and two sides of the U-shaped frame are of open structures and are used for simulating the stainless steel covering surface of the refueling water tank. One side of the open structure is provided with a flashboard, the periphery of the flashboard is provided with a sealing pressing strip, and two sides of the flashboard are provided with plate-shaped structures with U-shaped clamping grooves. The flashboard, the rack and the inflatable cofferdam form a sealed and reliable closed space together. Adopt one set of adjustment mechanism to set up between flashboard and inflatable cofferdam, adjustment mechanism is provided with groove structure, and groove structure cup joints in inflatable cofferdam upper end, and adjustment mechanism still is provided with protruding axle construction, and protruding axle construction is connected as an organic whole with U type draw-in groove.

When a sealing performance test is carried out, the inflatable cofferdam is installed on the bench, after the inflatable air bag is inflated with certain compressed air to expand and deform, the adjusting mechanism is operated to enable the inflatable air bag and the working surface of the bench to generate sealing specific pressure, and the closed space formed by the gate plate, the bench and the inflatable cofferdam can be filled with water to verify the sealing performance of the inflatable cofferdam.

Specifically, as shown in fig. 1, the present embodiment provides a testing apparatus for verifying sealing performance of an inflatable cofferdam, including a support rack 2, a sealing gate plate 3, a blocking plate 8, a pressure regulating mechanism 4, and the like.

The support rack 2 is of a U-shaped frame structure, as shown in fig. 1, the length of the support rack is the same as the span of the refueling water pool, and the stainless steel cover of the refueling water pool is simulated for the whole test device. The support rack 2 body is composed of a plurality of stainless steel coating layers, and the stainless steel coating layers are divided into a bottom surface steel coating layer 5, a steel coating layer transition section 6 and a vertical surface steel coating layer 7. The bottom steel cladding 5 is used to simulate the through weld of the stainless steel cladding of the refueling water tank. The front end and the rear end of the steel cladding transition section 6 are respectively welded with the vertical face steel cladding 7 and the bottom face steel cladding 5, so that the installation clearance between the vertical face steel cladding 7 and the bottom face steel cladding is compensated, and a transition fillet of the stainless steel cladding of the refueling water pool is simulated. The vertical face steel cladding 7 is provided with a mounting hole for fixedly connecting the sealing flashboard 3.

The sealing flashboard 3 is arranged on one side of the supporting rack 2, and two ends of the sealing flashboard are fixedly connected to the stainless steel cladding through bolts. As shown in fig. 2, the sealing shutter 3 has a rectangular plate-like structure, and the entire length thereof matches the support platform 2. The periphery of the sealing flashboard 3 is provided with a sealing pressing strip 9, and the sealing pressing strip 9 is pressed tightly through angle steel and used for compensating the gap at the joint of the sealing flashboard 3 and the support rack 2.

As shown in fig. 2, two side surfaces of the sealing shutter 3 are provided with two blocking plates 8 having a plate-like structure, and the blocking plates 8 are welded to the sealing shutter 3. The clamping plate middle part is provided with U type draw-in groove for fixed connection pressure regulating mechanism 4's bayonet lock clamp plate 15 plays the supporting role to pressure regulating mechanism 4 when experimental.

The pressure regulating mechanism 4 is arranged between the inflatable cofferdam 1 and the sealing gate plate 3 and is used for regulating the sealing specific pressure of the sealing air bag of the inflatable cofferdam 1 during the test. The pressure regulating mechanism 4 is shown in fig. 3, and includes a hand wheel 10, a lead screw 11, a pressing member 12, a clamp pin pressing plate 15 and a base 16. The pressure regulating mechanism 4 is supported on the support stand 2 through a base 16.

The head of the lower pressing piece 12 is provided with a groove structure matched with the inflatable cofferdam 1 in size and used for being sleeved at the upper end of the inflatable cofferdam 1. The hand wheel 10 is fixed on the top end of the screw rod 11 through a key and a nut and used for driving the screw rod 11 to rotate, and the screw rod 11 can convert the horizontal rotation of the hand wheel 10 into the up-and-down movement of the pressing piece 12. When the inflatable cofferdam is used, when a sealing air bag matched with the inflatable cofferdam 1 is inflated with certain compressed air to expand and deform, the hand wheel 10 is shaken by manpower to drive the screw rod 11 to rotate, and further drive the lower pressing piece 12 to be pressed downwards at the upper end of the inflatable cofferdam 1, so that a certain sealing specific pressure is formed between the sealing air bag and the working surface of the supporting rack 2, and the sealing air bag is adjusted according to the test requirement. The bayonet lock clamp plate 15 is provided with a protruding shaft structure matched with the U-shaped bayonet slot of the clamping plate 8 in size, and the protruding shaft structure and the clamping plate 8 are connected into a whole through bolts, so that the pressure adjusting mechanism 4 is supported.

The pressure regulating mechanism 4 further comprises a limiting nut 13 and a lead screw nut 14, and the limiting nut 13 and the lead screw nut 14 are both in a ring shape. The two limit nuts 13 are respectively arranged at the upper end and the lower end of the lower pressing piece 12 and used for limiting and fixing the lower pressing piece 12; the screw nut 14 is connected to the middle lower part of the screw 11 through threads, and four mounting holes are uniformly arranged along the circumferential direction of the ring and used for fixing the bayonet pressure plate 15.

The supporting rack 2, the sealing gate plate 3, the clamping plate 8 and a hand wheel 10, a screw rod 11, a lower pressing piece 12, a limiting nut 13, a screw rod nut 14 and a clamping pin pressing plate 15 of the pressure regulating mechanism 4 are all made of stainless steel materials; the base 16 is made of nylon material.

The test device of this embodiment provides the rack of simulation reloading pond stainless steel clad can, satisfies reloading pond inflatable cofferdam 1 site work condition. By operating the pressure regulating mechanism 4, the sealing specific pressure of the sealing air bag matched with the inflatable cofferdam 1 can be regulated during the sealing test. The test method can determine the critical sealing pressure value of the sealing air bag matched with the inflatable cofferdam 1 and can simultaneously verify the sealing performance of the sealing air bag matched with the inflatable cofferdam 1 and the sealing strip between the combined type water baffle plates. Meanwhile, the testing device is simple in structure, convenient to process and high in practicability.

The test method for verifying the sealing performance of the inflatable cofferdam of the embodiment comprises the following steps:

(1) and (3) completing an air tightness test: the inflatable cofferdam 1 is connected with an air inlet pipeline and a pressure gauge through a sealed air bag, and pressure is maintained for ten minutes after compressed air with certain pressure is slowly filled. And completely immersing the sealed air bag in water, and checking the air tightness of the sealed air bag.

(2) The assembly of the pressure regulating mechanism 4 is completed. Namely, the hand wheel 10, the lead screw 11, the lower pressing piece 12, the limit nut 13, the lead screw nut 14, the clamping pin pressing plate 15 and the base 16 are assembled into a complete pressure regulating mechanism 4.

(3) The sealing flashboard 3, the inflatable cofferdam 1 and the pressure regulating mechanism 4 are arranged on the support rack 2, so that the sealing flashboard 3, the support rack 2 and the inflatable cofferdam 1 form a sealed and reliable closed space together.

(4) And (3) finishing a critical sealing test, and determining a critical sealing pressure value and a normal working pressure value: and slowly filling compressed air with certain pressure into the sealed air bag of the inflatable cofferdam 1, filling the closed space with 0.3 to 0.5 meter of water level step by step, and observing the sealing condition of the inflatable cofferdam 1. If no leakage occurs, the pressure is reduced by 10% of the initial pressure value, and the observation is continued. And the rest is done in sequence until the leakage of the inflatable cofferdam 1 occurs. And (4) calculating the normal working pressure value of the corresponding water level according to the safety allowance of 1.2 times by taking the air pressure value of the last test as the critical sealing pressure value under the corresponding water level.

(5) And (3) finishing a long-acting sealing test: and (3) maintaining the pressure of the inflatable cofferdam 1 for twenty-four hours at the water level of 0.3-0.5 m and the normal working pressure, and checking the long-acting sealing property of the inflatable cofferdam 1.

(6) Completing the high-pressure strength test: slowly filling compressed air which is 2 to 4 times of the normal working pressure value into the sealed air bag of the inflatable cofferdam 1 step by step, filling 0.3 to 0.5 meter of water level into the closed space, checking the sealing condition of the inflatable cofferdam 1, maintaining the pressure for two hours, and checking the structural integrity of the sealed air bag and the inflatable cofferdam 1 body under the high-pressure working condition.

The present invention has been illustrated by the above embodiments, which are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the embodiments described. The invention is furthermore not limited to the embodiments described above, but many more variants can be made according to the invention, which variants fall within the scope of the invention as claimed.