CN115451216A - Pipeline flange fixing structure and fixing method of nuclear power explosion valve - Google Patents

Abstract

The invention relates to the technical field of nuclear power explosion valve maintenance, in particular to a pipeline flange fixing structure and a fixing method of a nuclear power explosion valve, wherein the pipeline flange fixing structure of the nuclear power explosion valve comprises a supporting seat, a fixing hole and a fixing device, wherein the fixing hole is provided with a mounting hole for a pipeline to pass through, and the aperture of the mounting hole is larger than the outer diameter of the pipeline, so that a gap is formed between the pipeline and the supporting seat; the supporting seat is arranged close to a pipeline flange fixedly connected to the end part of the pipeline; further comprising: the fixing device is arranged in the gap in a way that one end of the fixing device is pressed against the supporting seat and the other end of the fixing device is pressed against the pipeline, and a plurality of fixing devices which surround the periphery of the pipeline and are distributed at intervals form a clamping and positioning structure acting on the pipeline; the retention device is removable relative to the support base. According to the preferable pipeline flange fixing structure, the positions of the pipeline flange before and after the disassembly of the blasting valve are fixed, so that the centering adjustment time during the reloading of the blasting valve is shortened, the reloading time of the blasting valve is shortened, and the irradiation dose of working members is reduced.

Description

Pipeline flange fixing structure and fixing method of nuclear power explosion valve

Technical Field

The invention relates to the technical field of nuclear power explosion valve maintenance, in particular to a pipeline flange fixing structure and a fixing method of a nuclear power explosion valve.

Background

The AP1000 nuclear power plant adopts 12 blasting valves in total, and comprises 4 blasting valves of 14 inches on a4 th-level pipeline of an automatic pressure relief system, 4 blasting valves of 8 inches on a safety injection pipeline of a refueling water tank in a containment and 4 blasting valves of 8 inches on a recycling pipeline of the containment. The explosion valve is a valve special for the AP1000 nuclear power technology, has low pressure drop and high reliability without leakage, the valve has no leakage when the explosion valve is in normal operation and is not operated, a starting signal is received when an accident occurs in the system, and the explosion valve on the 4 th-level pipeline of the automatic pressure relief system is opened to fully reduce the pressure of a primary loop, so that conditions are provided for gravity safety injection of a refueling water tank arranged in a containment vessel in the next step. After the explosion valve on the gravity safety injection pipeline of the built-in refueling water tank of the containment vessel is opened, gravity water replenishing from the built-in refueling water tank of the containment vessel to the reactor core can be realized. And in the long-term operation stage after the accident, the blasting valve on the containment vessel recirculation pipeline is opened, so that the long-term cooling of the reactor core is realized.

According to the requirements of supervision tests and in-service tests, 1 disassembly check is required to be respectively extracted from each type of the blast valve in each refueling period, and whether the function of the blast valve on each system pipeline is normal is verified. During the inspection, need dismantle the pipeline flange of connection at the blast valve both ends, then move the blast valve body to the existing position and inspect, after the dismantlement, connect the pipeline flange of pipeline tip and fall towards ground under the action of gravity. When the valve body of the explosion valve needs to be reloaded, an operator needs to hang and pull the pipeline flange which is dropped and staggered to install the pipeline flange in a centering way, and then the pipeline flange is fixed on the valve body of the explosion valve. Due to the fact that the size and the weight of the pipeline flange are large, operators need to spend large physical strength and long time for installing the pipeline flange in a centering mode, the time consumed for installing the explosion valve is large, the irradiation dose of the working group members is large, and the potential safety hazard is large.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a pipeline flange fixing structure of a nuclear power explosion valve. And provides a method for fixing the pipeline flange of the nuclear power explosion valve.

The technical solution of the invention is as follows:

a pipeline flange retention structure of a nuclear power explosion valve comprises:

the supporting seat is provided with a mounting hole for a pipeline to pass through, and the aperture of the mounting hole is larger than the outer diameter of the pipeline, so that a gap is formed between the pipeline and the supporting seat;

the supporting seat is arranged close to a pipeline flange fixedly connected to the end part of the pipeline;

further comprising:

the fixing device is arranged in the gap in a way that one end of the fixing device is pressed against the supporting seat and the other end of the fixing device is pressed against the pipeline, and a plurality of fixing devices which surround the periphery of the pipeline and are distributed at intervals form a clamping and positioning structure acting on the pipeline; and the retention device is detachable relative to the support seat.

Further preferably, the retention means comprises:

the end face of the first wedge block is pressed against the supporting seat, the other end face of the first wedge block is pressed against the pipeline and inserted into one end of the gap, the first wedge block is in contact with the supporting seat, and the side of the first wedge block, which is contacted with the supporting seat, is an inclined first guide surface for guiding the first wedge block to enter the gap;

and one end face of the second wedge block is pressed against the supporting seat, the other end face of the second wedge block is pressed against the pipeline and inserted into the other end of the gap, and the second wedge block is inclined and guides the second wedge block to enter the second guide surface of the gap on the side in contact with the supporting seat.

Further preferably, the retention device further comprises:

one end of the connecting rod is connected to the first wedge block; the other end of the first wedge block penetrates through the second wedge block, a fastening nut is screwed on the other end of the second wedge block, and the fastening nut is screwed to reduce or elongate the movable distance between the first wedge block and the second wedge block.

Further preferably, the connecting rod is screwed to the first wedge.

Preferably, one surface of the first wedge block, which is connected with the pipeline, and one surface of the second wedge block, which is connected with the pipeline, are both arc surfaces matched with the outer contour surface of the pipeline.

Further preferably, the retention device further comprises:

one end surface of the protection plate is an arc surface which is matched with the outer contour of the pipeline and is attached to the pipeline; and the other end surface is provided with a slide rail part, the first wedge block and the second wedge block are matched and slidably connected on the slide rail part, and the first wedge block and the second wedge block are jacked and acted on the pipeline through the protection plate.

Further preferably, the protection plate is provided with a protection pad, and acts on the pipeline through the protection pad.

Further preferably, the retention means are four and the four retention means are equally spaced around the conduit.

A method for fixing a pipeline flange of a nuclear power explosion valve comprises the following steps:

s1: before the valve body of the blast valve is disassembled, the supporting seat is moved to a position close to a pipeline flange;

s2: a plurality of retention devices are arranged in a gap formed between the pipeline and the supporting seat at intervals so as to form a clamping and positioning structure acting on the pipeline;

s3: and the disassembly between the valve body of the blast valve and the pipeline flange is completed, so that the pipeline flange is fixed on the supporting seat.

Further preferably, after step S3 is completed, the pipe flange in two aligned positions at intervals needs to be measured by a measuring tool, and the position of the pipe flange needs to be adjusted by the positioning device.

The main beneficial effects of the above technical scheme are as follows:

1. before the blast valve body is dismantled, form the centre gripping location structure that acts on the pipeline through the maintenance device, keep the position of pipeline flange to keep certain before the blast valve body is dismantled, when convenient follow-up blast valve repacking, connect on the blast valve body with pipeline flange more swiftly, counterpoint fast, reduce when repacking, reduce the irradiation dose of reducing the work group member.

2. The installation environment that has combined the blast valve fixes maintenance device detachably in the space between supporting seat and the pipeline, like this, makes the supporting seat when the normal during operation of system, as the spacing protective structure of pipeline, when needs overhaul are dismantled, as the bearing structure to the maintenance device, need not additionally to set up all the other supporting structure. The functionality of the supporting seat is increased, and the maintenance cost is reduced.

3. The first wedge block and the second wedge block are adopted to simultaneously jack and press the pipeline, so that the clamping stability of the pipeline is improved.

4. One end of the connecting rod piece is screwed on the first wedge block, and the other end of the connecting rod piece penetrates through the second wedge block and is screwed with the fastening nut, so that the retention device is conveniently installed in the gap or is conveniently detached from the gap. Meanwhile, the jacking effect on the pipeline can be adjusted by screwing the fastening nut, so that the subsequent positioning adjustment of the pipeline is facilitated. And the thread structure can keep stable jacking effect.

5. The first wedge block and the second wedge block are matched and slidably connected to the protection plate and act on the pipeline in a jacking mode through the protection plate; therefore, on one hand, the sliding wedge block is prevented from scraping and damaging the pipeline; on the other hand, the action area on the pipeline is increased, stress concentration is avoided, and the area of clamping action on the pipeline is increased, so that the stability of the clamping action on the pipeline is improved; in addition, the slide rail part also leads the wedge block, so that the first wedge block and the second wedge block can be more stably inserted into the gap by screwing the fastening nut, the deviation is avoided, and the stable jacking effect can be further performed on the pipeline.

6. The protective pad is arranged, so that the protective effect on the pipeline can be improved; meanwhile, the protective pad adopts a rubber pad structure with high friction coefficient as follows, so that the friction between the protective pad and the outer side wall of the pipeline can be increased, and the stability of clamping the pipeline is improved.

7. The four retention devices are distributed around the pipeline at equal intervals, and can evenly provide jacking pressure for the pipeline from four directions so as to stably clamp the pipeline.

Further or more specific advantages will be described in the detailed description in connection with the specific embodiments.

Drawings

The invention is further described with reference to the accompanying drawings:

FIG. 1 is a schematic view of a retention device.

Fig. 2 is a schematic assembly view of the valve body of the explosion valve.

Fig. 3 is a schematic illustration of the fender installation.

Fig. 4 is a schematic structural diagram of the protection plate.

FIG. 5 is a side view of the retention device.

Fig. 6 is a schematic view of a measuring tool.

Shown in the figure: the pipeline guide device comprises a gap x, a support seat 1, a pipeline 2, a pipeline flange 3, a first wedge block a1, a first guide surface a101, a second wedge block a2, a second guide surface a201, a connecting rod piece a3, a fastening nut a4, a protection plate a5, a sliding rail part a501, a blasting valve body 4, a straight scale b1, a first measuring scale b2, a first reading pointer b201, a second measuring scale b3 and a second reading pointer b301.

Detailed Description

The following description is merely exemplary of the present invention and is not intended to limit the scope of the invention. In addition, the terms "vertical", "horizontal", "front", "rear", and the like, which refer to the orientation or positional relationship indicated in the embodiments of the present invention, are based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the product is conventionally placed when used, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. It is further noted that, unless expressly stated or limited otherwise, terms such as "mounted," "connected," "secured," and the like are intended to be construed broadly, and thus, for example, "connected" may be fixedly, releasably, or integrally connected; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

When the valve body 4 of the blast valve needs to be disassembled for maintenance, the disassembled pipeline flange 3 connected to the end part of the pipeline 2 drops towards the ground under the action of gravity. When the valve body 4 of the explosion valve needs to be reinstalled, a large amount of time and labor are needed for aligning the pipeline flange 3 with the inlet and the outlet of the valve body 4 of the explosion valve, and the valve body 4 of the explosion valve contains irradiation substances, so that the reinstalling time of the explosion valve is longer, the irradiation dose on the members of the working group is more, and the potential safety hazard is larger.

For solving above-mentioned problem, the inventor proposes before dismantling the blast valve body 4, carries out the technical scheme of rigidity earlier with pipeline flange 3, keeps the blast valve body 4 dismantling the front and back promptly, the uniformity of pipeline flange 3 position, like this, when 4 repacking at the blast valve body, can counterpoint the connection on blast valve body 4 more convenient, faster with pipeline flange 3 to it is consuming time to reduce the repacking, and then reduces the irradiation dose that the working group member received.

In order to realize the technical scheme, the inventor researches the installation environment of the valve body 4 of the explosion valve to discover that: on the blast valve pipeline of AP1000 nuclear power plant, as shown in figure 2, all lead to at the business turn over mouth of blast valve body 4 and have the pipeline 2, the tip fixedly connected with pipeline flange 3 of pipeline 2 for with the adaptation fixed connection of 4 business turns over of blast valve body. Simultaneously, because pipeline 2 is longer, pipeline 2's size is great moreover, and when normal work, certain shake can take place for pipeline 2, avoids pipeline 2 to take place the removal of big displacement, avoids pipeline 2 directly to drop ground when connecting the trouble simultaneously, can set up a plurality of supporting seats 1 along pipeline 2's extending direction, comes as pipeline 2's spacing protective structure. Specifically, the supporting seat 1 is provided with a mounting hole for the pipeline 2 to pass through, and the aperture of the mounting hole is larger than the outer diameter of the pipeline 2, so that a gap x is formed between the pipeline 2 and the supporting seat 1, and the gap x is used for receiving the shaking of the pipeline 2 to a certain degree and limiting the shaking amplitude.

Based on this, the inventor proposes a pipe flange retaining structure based on the installation environment of the valve body 4 of the burst valve, and the invention will be described in detail with reference to the accompanying drawings and embodiments.

In the first embodiment, as shown in fig. 1 and fig. 2, a support base 1 is arranged close to a pipeline flange 3 fixedly connected to the end of a pipeline 2, and a detachable retention device is arranged in a gap x between the support base 1 and the pipeline 2; specifically, one end of the retention device is pressed against the supporting seat 1, the other end of the retention device is pressed against the pipeline 2 and is arranged in the gap x, and a plurality of retention devices which surround the periphery of the pipeline 2 and are distributed at intervals form a clamping and positioning structure acting on the pipeline 2; in particular, as shown in fig. 5, the preferred embodiment is that the retention devices are four, and the four retention devices are distributed around the pipe 2 at equal intervals; i.e. the spacing of any two adjacent retention means around the circumference of the pipe 2 is preferably equal. In this way, the four retention means are equally spaced around the pipe 2, and can equally apply pressure to the pipe 2 from directions such as the four corners of a square, thereby stably clamping the pipe 2. And the retention means is removable with respect to the support seat 1, i.e. the retention means can be removed from the interspace x. Wherein the retention means may be a rubber plug or a hard plug adapted to the size of the gap x for direct filling in the gap x, but the plug cannot adjust the pressing action against the tube 2 in real time, and therefore, the present embodiment proposes a retention means as shown in fig. 1.

Specifically, the retention means in the present embodiment comprises a first wedge a1, and a second wedge a2, wherein:

the first wedge block a1 is inserted into one end of the gap x with one end surface pressing on the supporting seat 1 and the other end surface pressing on the pipeline 2, and the contact surface of the first wedge block a1 and the supporting seat 1 is an inclined first guide surface a101 for guiding the first wedge block a1 to enter the gap x.

The second wedge a2 is inserted into the other end of the gap x with one end surface pressing on the supporting seat 1 and the other end surface pressing on the pipeline 2, and the contact surface with the supporting seat 1 is an inclined second guide surface a201 for guiding the second wedge a2 to enter the gap x.

Thus, the first wedge a1 and the second wedge a2 can be directly pushed into the space x from both ends of the space x, respectively, to press and clamp the pipe 2. The strength of the jacking pressure on the pipeline 2 can be controlled by controlling the pushing depth, and the displacement of pushing the pipeline 2 to move can be adjusted by jacking the pipeline 2.

In order to improve the stability of the first wedge a1 and the second wedge a2 against the pipeline 2 and prevent the first wedge a1 and the second wedge a2 from falling off from the gap x, in this embodiment, the retention device further includes a connection rod a3, and one end of the connection rod a3 is connected to the first wedge a 1; the other end of the first wedge block is inserted through the second wedge block a2, a fastening nut a4 is screwed on the end of the second wedge block, and the fastening nut a4 is screwed to reduce or elongate the movable distance between the first wedge block a1 and the second wedge block a 2. Specifically, as shown in fig. 1, when the fastening nut a4 is turned leftward, the first wedge a1 and the second wedge a2 can be inserted into the gap x simultaneously to press the pipe 2 downward, so as to adjust the degree of turning, which not only can adjust the depth of the first wedge a1 and the second wedge a2 inserted into the gap x to adjust the displacement of the pipe 2 due to pressing, but also can adjust the specific fixed position of the pipe 2 by adjusting the plurality of retention devices distributed around the periphery of the pipe 2 at intervals. When the fastening nut a4 is turned to the right, the first wedge a1 and the second wedge a2 can be separated from the gap x for disassembly.

Further, in the present embodiment, the connection rod a3 is screwed to the first wedge a 1. This allows the retention means to be better disassembled for convenient storage and installation, avoiding the situation in which the connecting rod a3 integrally connected to the first wedge a1 cannot be smoothly inserted into the clearance x in a narrow position due to interference of the first wedge a 1.

Of course, in order to press the wedges against the pipe 2 better, the surface of the first wedge a1 that is in contact with the pipe 2 and the surface of the second wedge a2 that is in contact with the pipe 2 in this embodiment are both curved surfaces that are adapted to the outer contour surface of the pipe 2.

However, in practice, the moving wedge tends to scratch the pipe 2 during insertion into the space x and also tends to shift during insertion, and therefore, in this embodiment, a protection plate a5 removably placed on the outer side of the pipe 2 is also included. Specifically, as shown in fig. 3 and 4, one end surface of the protection plate a5 is an arc surface which is arranged to fit the outer contour of the pipeline 2 and is attached to the pipeline 2; the other end surface is provided with a slide rail part a501, the first wedge a1 and the second wedge a2 are respectively connected on the slide rail part a501 in a sliding way from two sides of the slide rail part a501, the sliding direction is corresponding to the moving direction of the wedges on the connecting rod part a3, and the first wedge a1 and the second wedge a2 are pressed and acted on the pipeline 2 through a protection plate a5. Thus, the first wedge block a1 and the second wedge block a2 are matched and slidably connected to the protection plate a5, and are pressed and acted on the pipeline 2 through the protection plate a 5; thus, on one hand, the position of the sliding damage is transferred to the protection plate a5, so that the sliding wedge block is prevented from scraping and damaging the pipeline 2; on the other hand, compared with the mode that a single wedge block directly acts on the pipeline 2, the mode that the protection plate a5 acts on the pipeline 2 improves the acting area on the pipeline 2, avoids stress concentration, increases the area of clamping action on the pipeline 2, and improves the stability of the clamping action on the pipeline 2; in addition, slide rail portion a501 has also carried out the direction to the voussoir, makes first voussoir, second voussoir more steadily come the cartridge in the space through twisting fastening nut, avoids taking place the skew, and then can carry out stable roof pressure effect to the pipeline.

Of course, in order to further improve the protection effect on the pipeline 2, in this embodiment, a protection pad is installed on a side of the protection plate a5 facing the pipeline 2, and the protection plate a5 acts on the pipeline 2 through the protection pad; simultaneously, the protection pad preferably adopts high coefficient of friction's rubber pad structure, can increase and the pipeline 2 lateral wall between the friction to improve the stability to the pipeline 2 centre gripping.

In a second embodiment, a method for retaining a flange of a pipe of a nuclear power explosion valve includes the steps of:

s1: before the valve body 4 of the blast valve is disassembled, the supporting seat 1 is moved to a position close to the pipeline flange 3, of course, the close distance needs to be set according to the actual scene, and if the distance is too far, even if the pipeline 2 is fixed on the supporting seat 1, the pipeline flange 3 is difficult to fix; if the distance is too close, the pipe flange 3 is likely to be collided or interfered. Therefore, on the premise that the fixing device can be mounted on the support base 1, the closer the support base 1 is to the pipe flange 3, the more stable the fixing of the pipe flange 3 can be performed.

S2: several retention means are mounted at intervals in the interspace x formed between the pipe 2 and the support seat 1 to constitute a clamping and positioning structure acting on the pipe 2.

S3: and the disassembly between the valve body 4 of the blast valve and the pipeline flange 3 is completed, so that the pipeline flange 3 is fixed on the supporting seat 1.

It should be further noted that, in order to confirm whether the pipe flange 3 is interfered when the valve body 4 of the blast valve is disassembled, in this embodiment, after step S3 is completed, two spaced pipe flanges 3 that are aligned to each other need to be measured by a measuring tool, the flare condition between the pipe flanges 3 and the coaxiality condition of the pipe flanges 3 are mainly measured, and the position of the pipe flange 3 is adjusted by the retention device. The adjustment is carried out by turning the fastening nut a4 of the retention device at different positions, as described above, and will not be described in detail here. Therefore, the position of the pipeline flange 3 is further confirmed and adjusted before the explosion valve is reinstalled, so that the time consumption of reinstalling the explosion valve can be further shortened, and the irradiation dose of a working group member can be reduced.

In the embodiment, the open mouth condition and the coaxiality condition are mainly measured by the measuring scale assembly as shown in fig. 6.

Specifically, as shown in fig. 6, the measuring scale assembly includes a ruler b1 with a reading marked at an edge, a first measuring scale b2 and a second measuring scale b3 which are connected to the ruler b1 in a sliding manner and are perpendicular to the ruler b 1; the first measuring scale b2 and the second measuring scale b3 are arranged at intervals, and a first reading pointer b201 is arranged at the part, connected to the ruler b1, of the first measuring scale b2 in a sliding mode and used for reading the reading on the ruler b1 in a matching mode; the part of the second measuring ruler b3, which is connected to the straight ruler b1 in a sliding manner, is provided with a second reading pointer b301, which is used for reading the reading on the straight ruler b1 in a matching manner.

When the mouth opening condition is measured, as shown in fig. 6, the left end surface of the first measuring scale b2 is parallel to the right end surface of the second measuring scale b 3. Through the right-hand member face with the left end face laminating left side pipeline flange 3 of first dipperstick b2, then remove second dipperstick b3 and go the left end face of laminating right side pipeline flange 3, see whether there is the clearance between the left end face of second dipperstick b3 and right side pipeline flange 3, if the zero clearance, then explain two spaced pipeline flanges 3 do not have a mouth, if there is the clearance, then need combine the size in clearance to adjust the position of pipeline flange 3 to the zero clearance through the maintenance device.

When measuring the coaxiality, as shown in fig. 6, the straight edge b1 is horizontally placed at the top position of the pipe flange 3. All be equipped with vertical spaced's reading on the left end face of first dipperstick b2, the right-hand member face of second dipperstick b3, see the reading of 3 tops of left side pipeline flange on first dipperstick b2, whether the reading with 3 tops of right side pipeline flange on second dipperstick b3 is the same, if different, then need adjust to the reading the same through the position of maintenance device to pipeline flange 3 according to the reading difference.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A pipeline flange retention structure of a nuclear power explosion valve comprises:

the pipeline support device comprises a support seat (1) and a pipeline support, wherein the support seat is provided with an installation hole for a pipeline (2) to pass through, and the aperture of the installation hole is larger than the outer diameter of the pipeline (2) so as to form a gap (x) between the pipeline (2) and the support seat (1); the method is characterized in that:

the supporting seat (1) is arranged close to a pipeline flange (3) fixedly connected to the end part of the pipeline (2);

further comprising:

the fixing device is arranged in the gap (x) with one end pressed against the supporting seat (1) and the other end pressed against the pipeline (2), and a plurality of fixing devices which surround the periphery of the pipeline (2) and are distributed at intervals form a clamping and positioning structure acting on the pipeline (2); and the retention means are removable with respect to the support seat (1).

2. The pipe flange retaining structure of a nuclear power explosion valve as recited in claim 1, wherein: the retention device includes:

the first wedge block (a 1) is pressed against the supporting seat (1) at one end face, pressed against the pipeline (2) at the other end face, inserted into one end of the gap (x), is in contact with the supporting seat (1) at one inclined face, and guides the first wedge block (a 1) into the first guide face (a 101) of the gap (x);

and one end surface of the second wedge block (a 2) is pressed against the supporting seat (1), the other end surface of the second wedge block (a 2) is pressed against the pipeline (2) and inserted into the other end of the gap (x), and one surface of the second wedge block (a 2) which is in contact with the supporting seat (1) is an inclined second guide surface (a 201) which guides the second wedge block (a 2) to enter the gap (x).

3. The pipe flange retaining structure of a nuclear power explosion valve as recited in claim 2, wherein: the retention device further comprises:

a connecting rod (a 3) having one end connected to the first wedge (a 1); the other end of the first wedge block penetrates through the second wedge block (a 2), a fastening nut (a 4) is screwed on the end of the second wedge block, and the fastening nut (a 4) is screwed to reduce or elongate the movable distance between the first wedge block (a 1) and the second wedge block (a 2).

4. The pipe flange retaining structure of a nuclear power explosion valve as recited in claim 3, wherein: the connecting rod piece (a 3) is screwed on the first wedge block (a 1).

5. The pipe flange retaining structure of a nuclear power explosion valve as recited in claim 4, wherein: and the surfaces of the first wedge block (a 1) and the pipeline (2) which are connected and the surfaces of the second wedge block (a 2) and the pipeline (2) which are connected are cambered surfaces matched with the outer contour surface of the pipeline (2).

6. The pipe flange retention structure of a nuclear power explosion valve as recited in claim 4, wherein: the retention device further comprises:

one end surface of the protection plate (a 5) is an arc surface which is matched with the outer contour of the pipeline (2) and is attached to the pipeline (2); the other end face of the first wedge block is provided with a sliding rail part (a 501), the first wedge block (a 1) and the second wedge block (a 2) are in adaptive sliding connection with the sliding rail part (a 501), and the first wedge block (a 1) and the second wedge block (a 2) are pressed and acted on the pipeline (2) through the protection plate (a 5).

7. The pipe flange retaining structure of a nuclear power explosion valve as recited in claim 6, wherein: the protection plate (a 5) is provided with a protection pad, and the protection plate (a 5) acts on the pipeline (2) through the protection pad.

8. The pipe flange retention structure of a nuclear power explosion valve as recited in claim 1, wherein: the retention means are four and are distributed around the pipe (2) at equal intervals.

9. A method for fixing a pipeline flange of a nuclear power explosion valve is characterized by comprising the following steps: the method comprises the following steps:

s1: before the valve body (4) of the explosion valve is disassembled, the supporting seat (1) is moved to a position close to the pipeline flange (3);

s2: a plurality of retention devices are arranged in a gap (x) formed between the pipeline (2) and the supporting seat (1) at intervals so as to form a clamping and positioning structure acting on the pipeline (2);

s3: and the disassembly between the valve body (4) of the blast valve and the pipeline flange (3) is completed, so that the pipeline flange (3) is fixed on the supporting seat (1).

10. A method of plumbing flange retention for a nuclear power pop-up valve as recited in claim 9, wherein: after step S3 is completed, the pipe flange (3) needs to be measured by a measuring tool in two spaced positions, and the position of the pipe flange (3) needs to be adjusted by the positioning device.

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