A primary grouting device and construction method for prestressed steel bundle ducts in nuclear power plants

Abstract

The present invention discloses a single-stage grouting device and construction method for prestressed steel bundle ducts in nuclear power plants, belonging to the field of nuclear power plant construction technology. The device comprises: a grouting system, a duct joint, a drainage pipe, a first gravity bucket, and a second gravity bucket. The grouting system communicates with the lower positions of both ends of the duct to be grouted via the duct joint. The drainage pipe is connected to the exhaust vent at the highest position of the duct to be grouted. The first gravity bucket and the second gravity bucket are respectively connected to the duct to be grouted and are located on either side of the drainage pipe. When the grouting system grouts the duct to be grouted, slurry can flow into the first and second gravity buckets. When the drainage pipe discharges the drainage water, the first and / or second gravity buckets can replenish the slurry within the duct to be grouted by gravity. The present invention is capable of single-stage grouting of prestressed steel bundle ducts with large height differences and large apertures.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant construction, and in particular relates to a primary grouting device and a construction method for a prestressed steel bundle duct in a nuclear power plant. Background Art

[0002] In some nuclear power plants, the prestressed steel bundle ducts are long and thick in diameter, the horizontal steel bundle ducts are arranged with large undulating arcs, and pass through three major gates and different elevations at different angles and through-pieces of different sizes; in addition, the dome gamma or inverted U-shaped steel bundle ducts all use a secondary grouting method, which has complex procedures and repetitive processes.

[0003] First, secondary grouting needs to be carried out in batches, sections, time, blowing and re-grouting, and the slurries of the two groutings are different, usually slow-setting slurry and expansion slurry; the secondary grouting process is constrained by time, temperature, ambient temperature and speed, and various performance parameters are very difficult to control, which can easily lead to unqualified scrapping and waste; secondly, the secondary grouting process affects the continuity of construction, and the waste slurry and wastewater generated by blowing are difficult to collect, which can easily cause pollution to the entity and the environment and difficult to treat, and does not meet the requirements of finished product protection and environmental protection; finally, the secondary grouting process occupies various resources, such as labor costs and construction period constraints. Therefore, there is an urgent need for a device and construction method for one-time grouting of prestressed steel bundle ducts in nuclear power plants. Summary of the Invention

[0004] Aiming at the deficiencies in the prior art, the present invention provides a one-time grouting device and construction method for prestressed steel bundle ducts in nuclear power plants, which can perform one-time grouting on prestressed steel bundle ducts with large height differences and large aperture curves.

[0005] The present invention provides the following technical solutions:

[0006] In a first aspect, a primary grouting device for a prestressed steel bundle duct in a nuclear power plant is provided, comprising: a grouting system, a duct joint, a drainage water pipe, a first gravity barrel and a second gravity barrel; the grouting system is connected to the low positions at both ends of the steel bundle duct to be grouted through the duct joint; the drainage water pipe is connected to the exhaust hole at the highest position of the steel bundle duct to be grouted; the first gravity barrel and the second gravity barrel are respectively connected to the steel bundle duct to be grouted and are located on both sides of the drainage water pipe, and the installation heights of the first gravity barrel and the second gravity barrel are higher than the highest position of the steel bundle duct to be grouted; when the grouting system grouts the steel bundle duct to be grouted, slurry can flow into the first gravity barrel and the second gravity barrel; when the drainage water pipe discharges the drainage water, the first gravity barrel and / or the second gravity barrel can rely on gravity to replenish the slurry inside them to the steel bundle duct to be grouted.

[0007] Optionally, a fourth control valve is provided on the pipeline connecting the first gravity bucket and the steel bundle channel to be grouted, a fifth control valve is provided on the pipeline connecting the second gravity bucket and the steel bundle channel to be grouted; and the drainage water pipe is provided with a drainage water control valve.

[0008] Optionally, the first gravity bucket and the second gravity bucket are both provided with transparent steel hoses on the pipelines communicating with the steel bundle duct to be grouting;

[0009] The first gravity bucket and the second gravity bucket are at the same height;

[0010] The first gravity barrel and the second gravity barrel are further provided with a slurry feeding pipeline communicating with the outside and a slurry feeding valve located in the slurry feeding pipeline.

[0011] Optionally, the grouting system includes a slurry storage tank, a grouting pump, a first control valve, a tee and a second control valve; the inlet of the grouting pump is connected to the slurry storage tank, and the outlet pipeline is connected to the first interface of the tee; the second interface and the third interface of the tee are respectively connected to the channel joints at both ends of the steel bundle channel to be grouted; the first control valve is arranged on the outlet pipeline of the grouting pump, and there are two second control valves, and one of them is arranged on the pipeline connecting the second interface of the tee and the first channel joint, and the other is arranged on the pipeline connecting the third interface of the tee and the second channel joint.

[0012] Optionally, a pressure gauge and a flow meter are further provided on the outlet pipeline of the grouting pump.

[0013] In a second aspect, a method for primary grouting of prestressed steel bundle ducts in a nuclear power plant is provided, the method comprising:

[0014] Step 1: Connect the first gravity bucket, the second gravity bucket, the drainage pipe, and the grouting system to the steel bundle channel to be grouted.

[0015] Step 2: Grouting is performed from the lower position to the higher position of the steel bundle channel to be grouted through the grouting system. During the grouting process, the slurry can enter the first gravity bucket and the second gravity bucket. When the amount of slurry entering the first gravity bucket and the second gravity bucket reaches the set requirements, the grouting system pumping is stopped;

[0016] Step 3: After the slurry pumping is completed, the steel bundle channel after the slurry pumping is drained multiple times through the drainage pipe. During each drainage process, the first gravity bucket and / or the second gravity bucket automatically fills the steel bundle channel after the slurry pumping by relying on their own gravity;

[0017] Step 4: After the slurry in the steel bundle channel has initially solidified, remove the connections between the first gravity bucket, the second gravity bucket, the drainage pipe, the grouting system, and the steel bundle channel to be grouted.

[0018] Optionally, step 2 specifically includes:

[0019] Step 2.1: Keep the fourth and fifth control valves closed, keep the drainage water control valve closed, and connect the grouting system to the steel bundle channel to be grouted;

[0020] Step 2.2: Open the drainage water control valve, and the grouting system pumps slurry from the low position to the high position of the steel bundle channel to be grouted. When the slurry flows out of the drainage water pipe evenly, sample it to test whether the slurry is qualified. If it is qualified, close the drainage water control valve and stop pumping.

[0021] Step 2.3: Open the fourth control valve and the fifth control valve, start the grouting system to pump slurry, and stop pumping slurry until the amount of slurry entering the first gravity bucket and the second gravity bucket reaches the set requirements.

[0022] Optionally, in step 2, before the grouting system officially pumps slurry into the steel bundle channel to be grouted, the pressure of the pumping slurry must first be controlled to be within a set range, while ensuring that the slurry delivered by the grouting system is qualified.

[0023] Optionally, step 3 specifically includes:

[0024] Step 3.1: Sampling the slurry in the first gravity barrel and the second gravity barrel to ensure that the slurry in the first gravity barrel and the second gravity barrel is qualified;

[0025] Step 3.2: Immediately after stopping the slurry pumping, the first drainage is performed; the first drainage is performed by using the first gravity bucket and the second gravity bucket to replenish the slurry in a sequential manner;

[0026] Step 3.3: After stopping the slurry pumping, drain the slurry for the second time; the first gravity bucket and the second gravity bucket are used to replenish the slurry in sequence during the second drainage.

[0027] Step 3.4: After stopping the slurry pumping, the third drainage is performed; the third drainage is performed by using the first gravity bucket and the second gravity bucket to work simultaneously to replenish the slurry.

[0028] Optionally, the first gravity barrel and the second gravity barrel are operated in sequence to perform grouting, including: opening the drainage water control valve, closing the fifth control valve, opening the fourth control valve, and draining water from one side of the steel bundle channel; when the liquid level in the first gravity barrel stops decreasing, closing the fourth control valve and opening the fifth control valve to drain water from the other side of the steel bundle channel; when the liquid level in the second gravity barrel stops decreasing, closing the drainage water control valve and opening the fourth and fifth control valves;

[0029] The first gravity barrel and the second gravity barrel are used to add slurry in a simultaneous working manner, including: opening the drainage water control valve, the fourth control valve and the fifth control valve, and when the liquid levels of the first gravity barrel and the second gravity barrel no longer drop, reducing the opening of the drainage water control valve until the slurry is initially solidified, and then closing the drainage water control valve, the fourth control valve and the fifth control valve.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The one-time grouting device of the present invention can ensure that only one grouting is required for the construction of the steel bundle duct to be grouted by the coordinated arrangement of the first gravity bucket, the second gravity bucket and the drainage pipe, thereby avoiding the secondary grouting of the horizontal, inverted U-shaped and gamma dome steel bundle ducts in the prior art. In addition, the arrangement of the drainage pipe can facilitate the centralized collection of the drainage water in the steel bundle duct, thereby avoiding pollution to the entity and the environment.

[0032] (2) The one-time grouting construction method of the present invention does not require grouting in batches, time periods, or by using retarding slurry and expansive slurry, nor does it require slurry blowing and re-grouting processes. The process of the present invention is simple and the processes are not repeated. In addition, since the one-time grouting construction method of the present invention does not require slurry blowing, it will not cause pollution to the entity and the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The diagram is a schematic diagram of the overall structure of a primary grouting device for a prestressed steel bundle duct in a nuclear power plant according to the present invention.

[0034] Figure 2 It is a schematic diagram of the pore expansion of the present invention.

[0035] Figure 3 It is an enlarged structural schematic diagram of the installation positions of the first gravity barrel and the second gravity barrel of the present invention.

[0036] Figure 4 It is an enlarged structural schematic diagram of the grouting system of the present invention.

[0037] Markings in the figure are: 100 is the grouting system, 101 is the slurry storage tank, 102 is the grouting pump, 103 is the first control valve, 104 is the tee pipe, 105 is the second control valve, 106 is the pressure gauge, 107 is the flow meter, 200 is the steel bundle channel to be grouted, 1 is the channel joint, 2 is the drainage pipe, 3 is the first gravity barrel, 4 is the second gravity barrel, 5 is the drainage control valve, 6 is the fourth control valve, and 7 is the fifth control valve. DETAILED DESCRIPTION

[0038] The present invention will now be described in further detail with reference to the accompanying drawings.

[0039] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", "high" and "low" cited in the invention are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content.

[0040] In addition, terms such as "first, second, or third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] Example 1

[0042] like Figure 1 and 2 As shown, a primary grouting device for a prestressed steel bundle duct in a nuclear power plant is provided, comprising: a grouting system 100, a duct joint 1, a drainage pipe 2, a first gravity barrel 3 and a second gravity barrel 4.

[0043] The grouting system 100 is connected to the low positions of both ends of the steel bundle channel 200 to be grouted through the channel joint 1; the structure of the channel joint 1 can refer to the existing technology, and the function of the channel joint 1 is to ensure the connection sealing between the grouting system 100 and the steel bundle channel.

[0044] The drainage pipe 2 is connected to the highest exhaust hole of the steel bundle channel 200 to be grouted.

[0045] like Figure 3 As shown, the first gravity barrel 3 and the second gravity barrel 4 are respectively connected to the steel bundle channel 200 to be grouted and are located on both sides of the drainage pipe 2. The installation height of the first gravity barrel 3 and the second gravity barrel 4 is higher than the highest position of the steel bundle channel 200 to be grouted; the shape of the first gravity barrel 3 and the second gravity barrel 4 is usually funnel-shaped, of course, it can also be other shapes. The shape and size of the first gravity barrel 3 and the second gravity barrel 4 can be adjusted according to actual needs. The first gravity barrel 3 and the second gravity barrel 4 are close to the drainage pipe 2, and the connection position with the steel bundle channel 200 to be grouted is at a high position, that is, the connection positions of the first gravity barrel 3 and the second gravity barrel 4 with the steel bundle channel 200 to be grouted are as close to the drainage pipe 2 as possible.

[0046] When the grouting system 100 grouts the steel bundle channel 200 to be grouted, the slurry can flow into the first gravity barrel 3 and the second gravity barrel 4; that is, the grouting system 100 can pump slurry from a low position to the first gravity barrel 3 and the second gravity barrel 4.

[0047] When the drainage pipe 2 discharges the slurry, the first gravity barrel 3 and / or the second gravity barrel 4 can rely on gravity to replenish the slurry inside thereof to the steel bundle channel 200 to be grouted.

[0048] The coordinated use of the first gravity barrel 3, the second gravity barrel 4 and the drainage pipe 2 can ensure that only one grouting is required for the construction of the grouting steel bundle duct 200, avoiding the need for secondary grouting for the construction of inverted U-shaped and gamma dome steel bundle ducts in the prior art. In addition, the provision of the drainage pipe 2 can facilitate the centralized collection of the exudate in the steel bundle duct, thereby avoiding pollution to the entity and the environment.

[0049] In this embodiment, a fourth control valve 6 is provided on the pipeline connecting the first gravity barrel 3 and the steel bundle channel 200 to be grouted, and a fifth control valve 7 is provided on the pipeline connecting the second gravity barrel 4 and the steel bundle channel 200 to be grouted; the drainage water pipe 2 is provided with a drainage water control valve 5; the opening of the fourth control valve 6 can connect the first gravity barrel 3 and the steel bundle channel 200 to be grouted, and the opening of the fifth control valve 7 can connect the second gravity barrel 4 and the steel bundle channel 200 to be grouted; the opening of the drainage water control valve 5 can drain water, exhaust air and drain slurry from the steel bundle channel.

[0050] In this embodiment, transparent steel wire hoses are provided on the pipelines connecting the first gravity barrel 3 and the second gravity barrel 4 with the steel bundle duct 200 to be grouted. The structure of the transparent steel wire hose can refer to the existing technology. The setting of the steel wire hose is only for the convenience of observing the slurry injection and water secretion of the pipeline connecting the first gravity barrel 3 and the steel bundle duct 200 to be grouted, and the pipeline connecting the second gravity barrel 4 and the steel bundle duct 200 to be grouted.

[0051] It is worth noting that the installation of the first gravity barrel 3 and the second gravity barrel 4 requires the assistance of a supporting structure, and specific reference may be made to the prior art. In addition, the connection method between the drainage pipe 2 and the highest exhaust hole of the steel bundle channel 200 to be grouted may also refer to the prior art.

[0052] In this embodiment, the first gravity bucket 3 and the second gravity bucket 4 are at the same height.

[0053] In some other embodiments, the first gravity barrel 3 and the second gravity barrel 4 are also provided with a slurry supply pipeline (not shown in the figure) connected to the outside world and a slurry supply valve (not shown in the figure) located in the slurry supply pipeline, that is, when the amount of slurry in the first gravity barrel 3 and the second gravity barrel 4 is insufficient, the slurry inside them can be replenished.

[0054] Of course, in some other embodiments, since the first gravity barrel 3 and the second gravity barrel 4 are connected to the atmosphere, other methods can also be used to replenish the slurry in the first gravity barrel 3 and the second gravity barrel 4.

[0055] In this embodiment, if Figure 1 and Figure 4As shown, the grouting system 100 includes a grouting tank 101 , a grouting pump 102 , a first control valve 103 , a tee pipe 104 and a second control valve 105 .

[0056] The inlet of the grouting pump 102 is connected to the slurry storage tank 101, and the outlet pipeline is connected to the first interface of the tee pipe 104; the second interface and the third interface of the tee pipe 104 are respectively connected to the channel joints 1 at both ends of the steel bundle channel 200 to be grouted; the first control valve 103 is arranged on the outlet pipeline of the grouting pump 102, and there are two second control valves 105, and one of them is arranged on the pipeline connecting the second interface of the tee pipe 104 and the first channel joint 1, and the other is arranged on the pipeline connecting the third interface of the tee pipe 104 and the second channel joint 1.

[0057] The first control valve 103, the second control valve 105, the fourth control valve 6 and the fifth control valve 7 can all be ball valves. In some other embodiments, a pressure gauge 106 and a flow meter 107 are also provided on the outlet pipeline of the grouting pump 102. The pressure gauge 106 can display the outlet pressure of the grouting pump 102, and the flow meter 107 can display the pumping volume of the grouting pump 102. The structure of the flow meter 107 can refer to the existing technology, such as the digital flow meter 107; of course, in some other embodiments, the flow meter 107 can also be provided at the second interface and the third interface of the tee pipe 104 to observe the amount of slurry flowing into the channels on the left and right sides.

[0058] In some other embodiments, a sampling port can be set at the first interface, the second interface or the third interface of the three-way pipe 104, and an emergency control valve is set at the connecting end of the sampling port. The emergency control valve can facilitate sampling and the flow of slurry in and out in emergency situations.

[0059] It is worth noting that the low positions at both ends of the steel bundle duct of the present invention refer to the low points at both ends of the gamma dome steel bundle duct, or the low points at both ends of the inverted U-shaped steel bundle duct. In some other embodiments, if the present invention is applied to a horizontal steel bundle duct, the duct joint 1 can also be connected at both ends of the horizontal steel bundle duct.

[0060] Example 2

[0061] A primary grouting construction method for a prestressed steel bundle duct in a nuclear power plant is provided, based on the primary grouting device of Example 1, comprising:

[0062] Step 1: Connect the first gravity barrel 3, the second gravity barrel 4, the drainage pipe 2, and the grouting system 100 to the steel bundle channel 200 to be grouted.

[0063] Specifically, the slurry storage tank 101, the grouting pump 102, the pressure gauge 106, the flow meter 107, the first control valve 103, the three-way pipe 104, and the second control valve 105 are connected to the steel bundle channel 200 to be grouted, and the first gravity barrel 3, the second gravity barrel 4, the fourth control valve 6, the fifth control valve 7 and the drainage pipe 2 are connected to the steel bundle channel 200 to be grouted.

[0064] Before the grouting system 100 officially pumps slurry into the steel bundle channel 200 to be grouted, the pressure of the pump slurry must be controlled within a set range, usually within 2 MPa, and at the same time ensure that the slurry delivered by the grouting system 100 is qualified. The standard for qualified slurry can be determined based on expert experience, and whether the slurry is qualified can be judged through sampling and testing.

[0065] Step 2: Grouting is performed from the low position to the high position of the steel bundle channel 200 to be grouted through the grouting system 100. During the grouting process, the slurry can enter the first gravity barrel 3 and the second gravity barrel 4. When the amount of slurry entering the first gravity barrel 3 and the second gravity barrel 4 reaches the set requirements, the grouting system 100 stops pumping slurry.

[0066] Step 2 specifically includes:

[0067] Step 2.1: Keep the fourth control valve 6 and the fifth control valve 7 in a closed state, keep the drainage water control valve 5 in a closed state, and connect the grouting system 100 to the steel bundle channel 200 to be grouted.

[0068] The slurry storage tank 101, grouting pump 102, pressure gauge 106, flow meter 107, first control valve 103, tee pipe 104, second control valve 105 are connected to the steel bundle channel 200 to be grouted, and the fourth control valve 6, fifth control valve 7 and drainage water control valve 5 are in the closed state.

[0069] Step 2.2: Open the drainage water control valve 5, and the grouting system 100 pumps slurry from the low position to the high position of the steel bundle channel 200 to be grouted. When the slurry flows out of the drainage water pipe 2 evenly, sampling is performed to test whether the outflowing slurry is qualified. If it is qualified, the drainage water control valve 5 is closed and the slurry pumping is suspended at the same time.

[0070] The grouting pump 102 pumps slurry into the steel bundle channel 200 to be grouted, and the drainage pipe 2 is located at the highest point. When the slurry flows out of the drainage pipe 2 evenly, it indicates that the steel bundle channel is initially filled.

[0071] Step 2.3: Open the fourth control valve 6 and the fifth control valve 7, start the grouting system 100 to pump slurry until the amount of slurry entering the first gravity barrel 3 and the second gravity barrel 4 reaches the set requirements, and then stop pumping slurry.

[0072] The amount of slurry in the first gravity barrel 3 and the second gravity barrel 4 needs to meet the grouting margin, which means that the amount of slurry in the gravity grouting barrel is greater than the theoretical amount required for hydration and water seepage of the prestressed channel; the amount of slurry entering the first gravity barrel 3 and the second gravity barrel 4 can be indirectly obtained according to the flow meter 107 of the grouting system 100, that is, after executing step 2.2, obtain the reading of the flow meter 107 once, and after executing step 2.3, obtain the reading of the flow meter 107 again. The difference between the two is the amount of slurry entering the first gravity barrel 3 and the second gravity barrel 4.

[0073] Step 3: After the slurry pumping is completed, the steel bundle channel after the slurry pumping is drained multiple times through the drainage pipe 2. During each drainage process, the first gravity bucket 3 and / or the second gravity bucket 4 automatically replenishes the slurry in the steel bundle channel after the slurry pumping by relying on their own gravity.

[0074] The number of times the exudate is drained is determined based on the ambient temperature and the initial setting time of the slurry.

[0075] The step 3 specifically includes:

[0076] Step 3.1: Sampling the slurry in the first gravity barrel 3 and the second gravity barrel 4 to ensure that the slurry in the first gravity barrel 3 and the second gravity barrel 4 is qualified.

[0077] Sampling is performed to test whether the slurry fluidity of the first gravity barrel 3 and the second gravity barrel 4 meets the requirements.

[0078] Step 3.2: Immediately after stopping the slurry pumping, the first drainage is performed; the first drainage is performed by using the first gravity bucket 3 and the second gravity bucket 4 to work in sequence to replenish the slurry.

[0079] The first time is usually about 1 hour after stopping the slurry pumping. The first gravity barrel 3 and the second gravity barrel 4 work in sequence to perform slurry replenishment, including: opening the drainage water control valve 5, closing the fifth control valve 7, opening the fourth control valve 6, and draining water from one side of the steel bundle channel. When the liquid level of the first gravity barrel 3 no longer drops, the fourth control valve 6 is closed, and the fifth control valve 7 is opened to drain water from the other side of the steel bundle channel. After the liquid level of the second gravity barrel 4 no longer drops, the drainage water control valve 5 is closed, and the fourth control valve 6 and the fifth control valve 7 are opened.

[0080] Step 3.3: After the slurry pumping is stopped, the second drainage is performed; the second drainage is performed by using the first gravity bucket 3 and the second gravity bucket 4 to work in sequence to replenish the slurry.

[0081] The second time is usually about 2 hours after the slurry pumping is stopped. The second drainage process can refer to the first drainage process for the method of using the first gravity bucket 3 and the second gravity bucket 4 to work in sequence to replenish the slurry.

[0082] Step 3.4: After stopping the slurry pumping for a third time, drainage is performed for the third time; the first gravity bucket 3 and the second gravity bucket 4 are used to perform slurry replenishment in a simultaneous working manner for the third drainage.

[0083] The third time is usually 2 hours after the second slurry discharge is completed, and can be adjusted according to the ambient temperature and the initial setting time of the slurry. The first gravity barrel 3 and the second gravity barrel 4 work simultaneously to replenish the slurry, including: opening the drainage water control valve 5, the fourth control valve 6 and the fifth control valve 7, and waiting until the liquid levels of the first gravity barrel 3 and the second gravity barrel 4 no longer drop, reducing the opening of the drainage water control valve 5 until the slurry initially sets, and then closing the drainage water control valve 5, the fourth control valve 6 and the fifth control valve 7.

[0084] It is worth noting that after each drainage, the fluidity of the outflowing slurry needs to be tested.

[0085] Before the slurry initially sets, the drainage control valve 5 is placed in a slightly open state to ensure that the slurry in the first gravity barrel 3 and the second gravity barrel 4 can replenish the subsequent slight bleeding water, and the bleeding water is squeezed out of the drainage pipe 2 through gravity replenishment, while observing the slurry amount in the first gravity barrel 3 and the second gravity barrel 4.

[0086] It is worth noting that when filling the slurry, it is necessary to ensure that the first gravity barrel 3, the second gravity barrel 4 and the drainage pipe 2 are not blocked. Bubbles will be generated during the drainage process, and the drainage water must be allowed to float up and the slurry must sink.

[0087] Step 4: After the slurry in the steel bundle channel has initially solidified, the connections between the first gravity bucket 3, the second gravity bucket 4, the drainage pipe 2, the grouting system 100 and the steel bundle channel 200 to be grouted are removed.

[0088] After disassembly, the wire hose can be cleaned for next use.

[0089] The prestressed channel is long and thick in diameter. The horizontal channel passes through three large gates. The gamma and inverted U-shaped channels are arranged with large undulating arcs and large height differences. The one-time grouting construction method of the present invention does not require grouting in batches, time periods, or with retarding slurry and expansion slurry. There is no need for blowing slurry or re-grouting (secondary grouting process). The process is simple and the steps are not repeated.

[0090] Due to the complex climate environment such as high temperature, typhoon and rainy season in nuclear power construction area, prestressed primary grouting construction is easier to control the grouting time, temperature, ambient temperature and speed compared with the secondary grouting process performance parameters. The slurry is intensively mass-produced and can be grouted continuously, which is not easy to scrap and cause waste.

[0091] The one-time grouting construction method of the present invention does not require slurry blowing and is not likely to cause pollution to the entity and the environment; thereby solving the problems of the secondary grouting process in the prior art, on-site processing of slurry, time and temperature constraints on the expansion slurry, and difficulty in collecting the generated waste slurry and wastewater.

[0092] The existing prestressed grouting process can no longer meet the requirements of lean construction for batch construction of third-generation nuclear power plants. The outer shell cylinder and the double shell are in a confined space working environment, the space between the double shells is narrow, and parallel construction and deep cross-construction are formed between different professions. When the construction period and resource allocation are determined, it can no longer meet the overall schedule requirements. Therefore, the one-time grouting process is suitable for large-aperture curved prestressed large height difference grouting of third-generation nuclear power plants.

[0093] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0094] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A primary grouting device for prestressed steel bundle ducts in nuclear power plants, characterized in that: include: A grouting system (100), a duct joint (1), a drainage water pipe (2), a first gravity barrel (3) and a second gravity barrel (4); the grouting system (100) is connected to the lower positions of both ends of the steel bundle duct (200) to be grouted through the duct joint (1); the drainage water pipe (2) is connected to the exhaust hole at the highest position of the steel bundle duct (200) to be grouted; the first gravity barrel (3) and the second gravity barrel (4) are respectively connected to the steel bundle duct (200) to be grouted and are located at the drainage water pipe (2). On both sides, the installation height of the first gravity barrel (3) and the second gravity barrel (4) is higher than the highest position of the steel bundle channel (200) to be grouted; when the grouting system (100) grouts the steel bundle channel (200) to be grouted, the slurry can flow into the first gravity barrel (3) and the second gravity barrel (4); when the drainage pipe (2) discharges the drainage water, the first gravity barrel (3) and / or the second gravity barrel (4) can rely on gravity to replenish the slurry inside them to the steel bundle channel (200) to be grouted.

2. The primary grouting device for prestressed steel bundle ducts in nuclear power plants according to claim 1, characterized in that: A fourth control valve (6) is provided on the pipeline connecting the first gravity bucket (3) and the steel bundle duct (200) to be grouted, and a fifth control valve (7) is provided on the pipeline connecting the second gravity bucket (4) and the steel bundle duct (200) to be grouted; and a drainage water control valve (5) is provided on the drainage water pipe (2).

3. The primary grouting device for prestressed steel bundle ducts in nuclear power plants according to claim 1, characterized in that: The first gravity barrel (3) and the second gravity barrel (4) are both provided with transparent steel hoses on the pipelines communicating with the steel bundle duct (200) to be grouting; The first gravity bucket (3) and the second gravity bucket (4) are at the same height; The first gravity barrel (3) and the second gravity barrel (4) are also provided with a slurry supply pipeline communicating with the outside world and a slurry supply valve located on the slurry supply pipeline.

4. The primary grouting device for prestressed steel bundle ducts in nuclear power plants according to claim 1, characterized in that: The grouting system (100) comprises a slurry storage tank (101), a grouting pump (102), a first control valve (103), a tee (104) and a second control valve (105); the inlet of the grouting pump (102) is connected to the slurry storage tank (101), and the outlet pipeline is connected to the first interface of the tee (104); the second interface and the third interface of the tee (104) are respectively connected to the channel joints (1) at both ends of the steel bundle channel (200) to be grouted; the first control valve (103) is arranged on the outlet pipeline of the grouting pump (102), and there are two second control valves (105), one of which is arranged on the pipeline where the second interface of the tee (104) is connected to the first channel joint (1), and the other is arranged on the pipeline where the third interface of the tee (104) is connected to the second channel joint (1).

5. The primary grouting device for prestressed steel bundle ducts in nuclear power plants according to claim 4, characterized in that: The outlet pipeline of the grouting pump (102) is also provided with a pressure gauge (106) and a flow meter (107).

6. A primary grouting construction method for prestressed steel bundle ducts in a nuclear power plant, based on the primary grouting device according to claim 2, characterized in that: include: Step 1: The first gravity bucket (3), the second gravity bucket (4), the drainage pipe (2), the grouting system (100) and the steel bundle duct (200) to be grouted are connected and unobstructed; Step 2: Grouting is performed from a low position to a high position of the steel bundle channel (200) to be grouted by the grouting system (100). During the grouting process, the slurry can enter the first gravity barrel (3) and the second gravity barrel (4). When the amount of slurry entering the first gravity barrel (3) and the second gravity barrel (4) reaches the set requirement, the grouting system (100) stops pumping slurry. Step 3: After the slurry pumping is completed, the steel bundle channel after the slurry pumping is drained multiple times through the drainage pipe (2). During each drainage process, the first gravity bucket (3) and / or the second gravity bucket (4) automatically fill the steel bundle channel after the slurry pumping with slurry by relying on their own gravity; Step 4: After the slurry in the steel bundle channel has initially solidified, the connection between the first gravity bucket (3), the second gravity bucket (4), the drainage pipe (2), the grouting system (100) and the steel bundle channel to be grouted (200) is removed.

7. The one-time grouting construction method for prestressed steel bundle ducts in nuclear power plants according to claim 6, characterized in that: The step 2 specifically includes: Step 2.1: Keep the fourth control valve (6) and the fifth control valve (7) in a closed state, keep the drainage water control valve (5) in a closed state, and connect the grouting system (100) to the steel bundle channel (200) to be grouted; Step 2.2: Open the drainage water control valve (5), and the grouting system (100) pumps slurry from the low position to the high position of the steel bundle channel (200) to be grouted. When the slurry flows out of the drainage water pipe (2) evenly, sampling is performed to test whether the discharged slurry is qualified. If it is qualified, the drainage water control valve (5) is closed and the slurry pumping is stopped at the same time; Step 2.3: Open the fourth control valve (6) and the fifth control valve (7), start the grouting system (100) to pump slurry until the amount of slurry entering the first gravity barrel (3) and the second gravity barrel (4) reaches the set requirements, and then stop pumping slurry.

8. The one-time grouting construction method for prestressed steel bundle ducts in nuclear power plants according to claim 6, characterized in that: In the step 2, before the grouting system (100) formally pumps slurry into the steel bundle channel (200) to be grouted, the pressure of the pumping slurry must be controlled to be within a set range, and at the same time, the slurry delivered by the grouting system (100) must be qualified.

9. The one-time grouting construction method for prestressed steel bundle ducts in nuclear power plants according to claim 6, characterized in that: The step 3 specifically includes: Step 3.1: sampling the slurry in the first gravity barrel (3) and the second gravity barrel (4) to ensure that the slurry in the first gravity barrel (3) and the second gravity barrel (4) is qualified; Step 3.2: Immediately after stopping the slurry pumping, the first drainage is performed; the first drainage is performed by using the first gravity bucket (3) and the second gravity bucket (4) to replenish the slurry in a sequential manner; Step 3.3: After stopping the slurry pumping, the second drainage is performed; the second drainage is performed by using the first gravity bucket (3) and the second gravity bucket (4) to replenish the slurry in a sequential manner; Step 3.4: After stopping the slurry pumping for a third time, drainage is performed for the third time; the third drainage is performed by using the first gravity bucket (3) and the second gravity bucket (4) to work simultaneously for slurry replenishment.

10. The one-time grouting construction method for prestressed steel bundle ducts in nuclear power plants according to claim 9, characterized in that: The first gravity barrel (3) and the second gravity barrel (4) perform grouting in a sequential working manner, including: opening the drainage water control valve (5), closing the fifth control valve (7), opening the fourth control valve (6), and draining water from one side of the steel bundle channel; when the liquid level of the first gravity barrel (3) stops decreasing, closing the fourth control valve (6), opening the fifth control valve (7), and draining water from the other side of the steel bundle channel; when the liquid level of the second gravity barrel (4) stops decreasing, closing the drainage water control valve (5), and opening the fourth control valve (6) and the fifth control valve (7); The first gravity barrel (3) and the second gravity barrel (4) are operated simultaneously to perform slurry replenishment, including: opening the drainage water control valve (5), the fourth control valve (6) and the fifth control valve (7); when the liquid levels of the first gravity barrel (3) and the second gravity barrel (4) no longer decrease, reducing the opening of the drainage water control valve (5) until the slurry is initially solidified, and then closing the drainage water control valve (5), the fourth control valve (6) and the fifth control valve (7).

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