Heavy concrete material and heavy concrete construction method for transfer-cleaning room

Abstract

The invention discloses a heavy concrete material and a heavy concrete construction method for a transfer-cleaning room. The heavy concrete material is prepared from the following raw materials in parts by mass: 162-170 parts of water, 375-372 parts of cement, 16.23-16.30 parts of an additive, 1492-1536 parts of sand and 1612-1632 parts of gravel, the slump of the formed hematite concrete is 150 + / -30mm. The heavy concrete with large slump is obtained through research and development, and the construction difficulty of preparation and cast-in-place of the heavy concrete is reduced. The invention further provides a transfer-cleaning room heavy concrete construction method, the construction process that the belt conveyor is adopted for conveying the heavy concrete is adopted, the difficulty of conveying the heavy concrete in a limited space is solved, the heavy concrete conveying distance is greatly increased, the heavy concrete conveying efficiency is greatly improved, and then the heavy concrete construction quality is guaranteed; and meanwhile, the effects of reducing cost and increasing efficiency of an engineering project are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant construction, and in particular to a heavy concrete material and a heavy concrete construction method for a transfer-cleaning room. Background Art

[0002] Heavy concrete for nuclear power plants is usually made of particularly dense and heavy aggregates. Heavy concrete is opaque to X-rays and gamma rays and is mainly used as a shielding structural material for nuclear engineering. Heavy concrete has the characteristics of high bulk density and fast slump loss.

[0003] When the construction of the nuclear power plant transfer-cleaning room was planned, the vault of the plant had been poured and the top of the reactor had been closed, so it was impossible to use a tower crane to lift concrete. The current construction method is to use a pump-pipe pumping process, which is not only difficult to meet the slump requirements of heavy concrete (6-8cm), but also prone to segregation during long-distance transmission. It is also easy for the concrete pump's stirring blades to be unable to stir and block the pump, making it difficult to meet quality requirements. Summary of the invention

[0004] The object of the present invention is to provide a heavy concrete material and a heavy concrete construction method for a transfer-cleaning room in view of the above problems.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] A heavy concrete material is hematite concrete, comprising the following component raw materials in parts by weight:

[0007] 162-170 parts of water, 375-372 parts of cement, 16.23-16.30 parts of admixture, 1492-1536 parts of sand, 1612-1632 parts of crushed stone; the sand is hematite sand, and the gradation requirement is 0-5mm continuous gradation; the crushed stone is hematite crushed stone, and the gradation requirement is 5-25mm continuous gradation; the slump of the hematite concrete is 150±30mm.

[0008] The cement is P·N42.5; the admixture is a water reducer, preferably PCA-I; the average density of the sand and gravel is not less than 4.6×10 3 kg / m 3 The density of the hematite concrete is not less than 3.45×10 3 kg / m 3 The standard value of the cube compressive strength of the hematite concrete is not less than 40MPa.

[0009] According to the above mass parts, weigh the raw materials of each component, stir and mix, and the order of adding materials is crushed stone, sand, cement, water and admixture.

[0010] A heavy concrete construction method for a transfer-cleaning room adopts the heavy concrete material and transfers the heavy concrete material to the transfer-cleaning room through a conveyor for pouring.

[0011] To optimize the above technical solutions, the specific measures taken also include:

[0012] The specific construction steps include:

[0013] Installation of steel structure cylinder of cleaning room and setting of construction joints;

[0014] Use conveyors to transfer heavy concrete to the wash room for pouring;

[0015] Heavy concrete curing in washrooms;

[0016] Installation of the steel structure cylinder of the transfer room and the connecting section between the transfer room and the cleaning room;

[0017] Use conveyors to transfer heavy concrete to the transfer room for pouring;

[0018] Heavy concrete maintenance in transfer room.

[0019] Furthermore, after the heavy concrete material is prepared, the transfer and transportation to the transfer-cleaning room includes three stages:

[0020] Stage 1: transport the heavy concrete from the ground outside the plant to the transport bridge plate and transport it by crane;

[0021] Stage 2: transporting heavy concrete from the transport bridge to the reactor building hall, using No. 1 belt conveyor;

[0022] Stage 3: Transport the heavy concrete from the reactor building hall to the top of the transfer-cleaning room using the No. 2 belt conveyor.

[0023] In the second stage, the transport is divided into several sections by 1# belt conveyor; in the third stage, the whole is directly transported by 2# belt conveyor; 2# belt conveyor is installed on the floor of the transfer-cleaning room.

[0024] Furthermore, the 1# belt conveyor and the 2# belt conveyor are both inclined, gradually rising from far away from the transfer-cleaning room to close to the transfer-cleaning room, and the inclination angle is set as follows: when pouring heavy concrete in the cleaning room and when pouring heavy concrete in the transfer room, the angles of the 1# belt conveyor and the 2# belt conveyor are adjusted according to the size of the pouring space; according to the transmission efficiency of the belt conveyor and the compressive strength of the steel plate, the pouring speed of the concrete does not exceed 7m 3 / h.

[0025] Furthermore, a material receiving port is provided below the material distributing position of the 2# belt conveyor, and the heavy concrete flows into the chute through the material receiving port, and the chute is within 1m above the pouring elevation.

[0026] Furthermore, protective cloth is laid on the lower part of the entire heavy concrete transportation route to prevent heavy concrete from dripping and contaminating the ground or equipment; a protective frame is set up at the transfer and handover point of the concrete of 1# belt conveyor and 2# belt conveyor, and geotextile or fireproof cloth is used to completely cover the outside of the protective frame, and a hopper is set up below to collect the heavy concrete dripping during the concrete transfer project, and the collected heavy concrete is then sealed and transported out of the factory.

[0027] Furthermore, when pouring heavy concrete, it is poured in layers and sections, and construction joints are set between each layer and each section; when pouring in layers, it is poured in batches, and the pouring thickness of each time shall not exceed 0.30m until one layer is poured; each construction joint contains a right-angle step structure, and the vertical side length of the step is ≥3cm to effectively block rays.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The invention provides a heavy concrete material scheme. By developing heavy concrete, heavy concrete with large slump is obtained. The slump is expanded from the original 6 to 8 cm to 15±3 cm, thereby reducing the construction difficulty of heavy concrete preparation and on-site pouring.

[0030] The present invention also provides a heavy concrete construction method for a transfer-cleaning room. The original transmission process of heavy concrete is pumping or crane + hopper, which is greatly affected by the structural position and space conditions. The present invention adopts a belt conveyor to transmit heavy concrete construction technology, which solves the difficulty of heavy concrete transmission in a confined space, greatly improves the transmission distance and transmission efficiency of heavy concrete, thereby ensuring the construction quality of heavy concrete, and at the same time achieving the effect of reducing costs and increasing efficiency of engineering projects. The heavy concrete construction joint is set as a right-angle step to effectively block radiation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the steel structure of the transfer-cleaning room.

[0032] Figure 2 This is a schematic diagram of the cylinder wall nodes of the steel structure of the transfer-cleaning room.

[0033] Figure 3 Schematic diagram of the installation plan of the belt conveyor for heavy concrete pouring in the cleaning room.

[0034] Figure 4 Schematic diagram of the installation section of the belt conveyor for pouring heavy concrete in the cleaning room.

[0035] Figure 5Schematic diagram of the installation plan of the belt conveyor for pouring heavy concrete in the transfer room.

[0036] Figure 6 Schematic diagram of the cross-section of the installation of a belt conveyor for pouring heavy concrete in the transfer room.

[0037] Figure 7 This is a schematic diagram of the cross section of a belt conveyor.

[0038] Figure 8 This is a schematic diagram of the concrete transfer station for 1# and 2# belt conveyors.

[0039] Fig. 9 This is a schematic diagram of the layered pouring of the heavy concrete structure of the transfer-cleaning room.

[0040] Fig.10 Schematic diagram of construction joints for heavy concrete walls and floor slabs.

[0041] In the figure, 1. cleaning room; 2. transfer room; 3. 1# belt conveyor; 4. 2# belt conveyor; 5. outer steel plate cylinder wall; 6. angle steel keel; 7. supporting channel steel; 8. anchor nails; 9. inner steel plate cylinder wall; 10. material receiving port; 11. chute; 12. protective cloth; 13. material transfer port; 14. hopper; 15. protective frame; 16. geotextile; 17. steel bottom formwork for the top plate of the cleaning room; 18. steel bottom formwork for the top plate of the transfer room. DETAILED DESCRIPTION

[0042] The above contents of the present invention are further described in detail below in the form of embodiments, but this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the above contents of the present invention belong to the scope of the present invention.

[0043] The present invention provides a heavy concrete material, which is hematite concrete, comprising the following component raw materials in parts by weight:

[0044] 162-170 parts of water, 375-372 parts of cement, 16.23-16.30 parts of admixture, 1492-1536 parts of sand, 1612-1632 parts of crushed stone; the sand is hematite sand, and the gradation requirement is 0-5mm continuous gradation; the crushed stone is hematite crushed stone, and the gradation requirement is 5-25mm continuous gradation; the slump of hematite concrete is 150±30mm.

[0045] Among them, the cement is P·N42.5; the admixture is a water reducer, preferably PCA-I; the average density of sand and gravel is not less than 4.6×10 3 kg / m 3 ; The density of hematite concrete is not less than 3.45×10 3 kg / m 3The standard value of the cube compressive strength of hematite concrete is not less than 40MPa.

[0046] In the construction of nuclear power plants, nuclear power cement must use P·N42.5. The water reducer is not limited to PCA-I, and other water reducers with equal performance can also be used. PCA-I is a high-performance water reducer.

[0047] According to the above mass parts, weigh the raw materials of each component, stir and mix, and the order of adding materials is crushed stone, sand, cement, water and admixture.

[0048] The present invention also provides a heavy concrete construction method for a transfer-cleaning room, which adopts heavy concrete materials and transports the heavy concrete materials through a conveyor to be poured into the transfer-cleaning room.

[0049] The construction steps include:

[0050] Installation of steel structure cylinder of cleaning room and setting of construction joints;

[0051] Use conveyors to transfer heavy concrete to the wash room for pouring;

[0052] Heavy concrete curing in washrooms;

[0053] Installation of the steel structure cylinder of the transfer room and the connecting section between the transfer room and the cleaning room;

[0054] Use conveyors to transfer heavy concrete to the transfer room for pouring;

[0055] Heavy concrete maintenance in transfer room.

[0056] After the heavy concrete material is prepared, its transfer and transportation to the transfer-cleaning room includes three stages:

[0057] Stage 1: transport the heavy concrete from the ground outside the plant to the transport bridge plate and transport it by crane;

[0058] Stage 2: transporting heavy concrete from the transport bridge to the reactor building hall, using No. 1 belt conveyor;

[0059] Stage 3: Transport the heavy concrete from the reactor building hall to the top of the transfer-cleaning room using the No. 2 belt conveyor.

[0060] In the second stage, the belt conveyor 1# is used to transport the equipment to the site in sections. In the embodiment, the belt conveyor 1# is divided into three sections. Since the length of the belt conveyor 1# reaches 40m, it cannot be transported without sections. Figure 4 , Figure 6 ; In the third stage, it is directly transported to the site through the 2# belt conveyor. The length of the 2# belt conveyor is 20m. If it is shorter, it can be transported as a whole; the 2# belt conveyor is installed on the floor of the transfer-cleaning room.

[0061] 1# belt conveyor and 2# belt conveyor are both inclined, gradually rising from far away from the transfer-cleaning room to close to the transfer-cleaning room. The inclination angle is set as follows: when pouring heavy concrete in the cleaning room, the angle of 1# belt conveyor is 0~16°, and the angle of 2# belt conveyor is 0~16°; when pouring heavy concrete in the transfer room, the angle of 1# belt conveyor is 0~16°, and the angle of 2# belt conveyor is 0~11°; according to the transmission efficiency of the belt conveyor and the compressive capacity of the steel plate, the pouring speed of concrete shall not exceed 7m 3 / h.

[0062] A material receiving port is set below the feeding position of the 2# belt conveyor. The heavy concrete flows into the chute through the material receiving port. The chute is temporarily fixed by tie-tie channel steel or angle steel in the steel plate. The fixed position is adjusted in time before and during pouring to ensure that the chute is within 1m above the pouring elevation.

[0063] Protective cloth must be laid on the lower part of the entire heavy concrete transportation route to prevent heavy concrete from dripping and contaminating the ground or equipment; protective frames must be set up at the transfer and handover points of concrete for 1# belt conveyor and 2# belt conveyor, and geotextile or fireproof cloth must be used to completely cover the protective frames. A hopper is set up below to collect heavy concrete dripping during the concrete transfer project, and the collected heavy concrete is then sealed and transported out of the factory.

[0064] The present invention is further described in detail below in conjunction with specific embodiments:

[0065] Take the construction of a nuclear power plant as an example. Figure 1 , 2 and Fig. 9 As shown, the outer diameter of the cylinder of transfer room 1 is R=5.1m, the outer diameter of the cylinder of cleaning room 2 is R=4.75m, the distance between the double-layer steel plate cylinder walls is 1000mm, the height of the cylinder wall is 11250mm, there is no structural steel bar between the double-layer steel plate cylinder wall of the outer steel plate cylinder wall 5 and the inner steel plate cylinder wall 9, there is a bottom steel plate at the bottom between the cantilevered parts, the bottom of the non-cantilevered part is located on the 20.200m floor slab, and the top elevation is 31.450m.

[0066] Angle steel keels 6 are provided on the contact surface between the inside of the double-layer steel plate cylinder wall and the concrete, which are placed vertically with a spacing of @9.2°; supporting channel steels 7 are provided between the angle steel keels of the double-layer steel plate cylinder wall, which are placed horizontally with a spacing of @1200mm along the height direction of the cylinder wall; anchor nails 8 are provided on the contact surface between the inside of the double-layer steel plate cylinder wall and the concrete of the cylindrical steel structure, and the anchor nails are φ19×150, with a horizontal spacing of @3.2° and a vertical spacing of @200mm. Anchor nails 8 are not provided at places where there are angle steel keels 6.

[0067] The raw materials of hematite concrete were accurately weighed: nuclear power 42.5 silicate cement: 375kg; water: 162kg; PCA-I admixture: 16.30kg; 0-5mm hematite sand: 1492kg; 5-25mm hematite crushed stone: 1615kg; the hematite concrete mixed in the forced mixer was discharged from the machine. The results are shown in Table 1.

[0068] Table 1 Results of hematite concrete machine output

[0069] Mixing time Slump out of the machine Output temperature 60s 175 24.9

[0070] The heavy concrete for the transfer-cleaning room prepared by the scheme of this embodiment has a slump changed from the original 60-80 mm to 150±30 mm, and the strength grade of the heavy concrete for the transfer-cleaning room is C40.

[0071] The heavy concrete structure of the transfer-cleaning room of the present embodiment and the concrete pouring process method thereof include:

[0072] The slump design was changed and a heavy concrete mix with large slump was developed;

[0073] Installation of steel structure cylinder and setting of construction joints in cleaning room 1;

[0074] 1# belt conveyor 3, 2# belt conveyor 4 hoisting and installation, such as Figure 7 As shown;

[0075] Cleaning room 1 Heavy concrete production, transportation, such as Figure 3 , 4 As shown;

[0076] The heavy concrete of the cleaning room 1 is poured using a belt conveyor;

[0077] Washroom 1 heavy concrete curing;

[0078] Transfer room 2, installation of steel structure cylinder of connecting section;

[0079] Transfer room 2 Heavy concrete production and transportation, such as Figure 5 , 6 As shown;

[0080] 2# belt conveyor 4 adjusts its position and reinstalls it;

[0081] The 2-layer concrete of the transfer room was poured using a belt conveyor;

[0082] 2-stage concrete curing in the transfer room;

[0083] 1# belt conveyor 3 and 2# belt conveyor 4 are dismantled.

[0084] According to the on-site cleaning room 1, transfer room 2 and surrounding structures, the planned concrete transportation is divided into three sections. The first section is from the 0.000m ground outside the plant to the 20.150m plate of the transport bridge, which is transported by bridge crane; the second section is from the transport bridge to the reactor building hall, which is transported by a 40m long belt conveyor; the third section is from the reactor hall to the top of the transfer room cleaning room, which is transported by a 20m long belt conveyor.

[0085] Since the transportation path from the second section to the third section is not on the same route and elevation, the belt conveyor needs to be replaced.

[0086] In the second section, 1# belt conveyor 3 was divided into 3 sections and transported to the site separately. Since 1# belt conveyor was 40m long and could not be transported without sections, 2# belt conveyor 4 was directly transported to the site as a whole. 2# belt conveyor was 20m long, which was shorter and could be transported as a whole. 1# belt conveyor 3 was installed at an angle of 16°, and 2# belt conveyor 4 was installed at an angle of 16° and was installed on a 20.200m floor slab.

[0087] The installation angle of the reinstalled 2# belt conveyor 4 is adjusted to 11°.

[0088] According to the transmission efficiency of the belt conveyor and the compressive capacity of the steel plate, the concrete pouring shall not exceed 7m 3 / h.

[0089] The first layer of the cantilevered part is poured with 1m of concrete, and the upper cylinder wall is poured after the concrete strength of this section reaches 100%. A material receiving port 10 is set below the material distribution position of the belt conveyor, and the concrete flows into the chute 11 through the material receiving port. In the embodiment, the chute 11 is temporarily fixed by the steel plate inner tie channel steel or angle steel, and the fixed position is adjusted in time before and during pouring to ensure that the chute 11 is within 1m above the pouring elevation.

[0090] The entire belt conveyor concrete transportation route needs to be laid with protective cloth 12 at the bottom to prevent concrete dripping and contaminating the ground or equipment; the end of 1# belt conveyor 3 is equipped with a transfer port 13, and the concrete transfer point of 1# belt conveyor 3 and 2# belt conveyor 4 needs to be set up with a protective frame 15, and the outside of the protective frame is completely covered with geotextile 16, and a hopper 14 is set below to collect the concrete dripping during the concrete transfer project. The collected concrete is then sealed and transported out of the factory building. Figure 8 shown.

[0091] When pouring heavy concrete, it is poured in layers and sections, and construction joints are provided between each layer and each section.

[0092] The layers are vertical and the sections are horizontal. When pouring in layers, pouring is carried out in batches, and the pouring thickness of each time shall not exceed 0.30m until one layer is poured. The layers can be set to about 2m, with no gaps within the layers and construction joints between the layers. Construction joints are also set between the sections. There is no specific section length requirement for the sections, as long as it is reasonable.

[0093] Each construction joint contains a right-angle step structure with a vertical side length of ≥3cm to effectively block radiation.

[0094] The construction joint is constructed by laying out a main keel formed of wood or steel pipes and setting up wire mesh to enclose a non-casting space, and forming a construction joint after the concrete is poured.

[0095] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, according to the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiment still falls within the protection scope of the technical solution of the present invention.

Claims

1. A heavy concrete material, characterized in that: The hematite concrete comprises the following raw materials by weight: 162-170 parts of water, 375-372 parts of cement, 16.23-16.30 parts of admixture, 1492-1536 parts of sand, 1612-1632 parts of crushed stone; the sand is hematite sand, and the gradation requirement is 0-5mm continuous gradation; the crushed stone is hematite crushed stone, and the gradation requirement is 5-25mm continuous gradation; the slump of the hematite concrete is 150±30mm.

2. The heavy concrete material according to claim 1, characterized in that: The cement is P·N42.5; the admixture is a water reducer; the average density of the sand and gravel is not less than 4.6×10 3 kg / m 3 The density of the hematite concrete is not less than 3.45×10 3 kg / m 3 The standard value of the cube compressive strength of the hematite concrete is not less than 40MPa.

3. The method for preparing the heavy concrete material according to claim 1, characterized in that: According to the mass parts in claim 1, weigh the raw materials of each component, stir and mix, and the order of adding materials is crushed stone, sand, cement, water and admixture.

4. A heavy concrete construction method for a transfer-cleaning room, characterized in that: The heavy concrete material according to claim 1 or 2 is used to transport the heavy concrete material to a transfer-cleaning room via a conveyor.

5. The heavy concrete construction method for the transfer-cleaning room according to claim 4 is characterized in that: The construction steps include: Installation of steel structure cylinder of cleaning room and setting of construction joints; Use conveyors to transfer heavy concrete to the wash room for pouring; Heavy concrete curing in washrooms; Installation of the steel structure cylinder of the transfer room and the connecting section between the transfer room and the cleaning room; Use conveyors to transfer heavy concrete to the transfer room for pouring; Heavy concrete maintenance in transfer room.

6. The heavy concrete construction method for the transfer-cleaning room according to claim 4 is characterized in that: After the heavy concrete material is prepared, the transfer and transportation to the transfer-cleaning room includes three stages: Stage 1: transport the heavy concrete from the ground outside the plant to the transport bridge plate and transport it by crane; Stage 2: transporting heavy concrete from the transport bridge to the reactor building hall, using No. 1 belt conveyor; Stage 3: Transport the heavy concrete from the reactor building hall to the top of the transfer-cleaning room using the No. 2 belt conveyor.

7. The heavy concrete construction method for the transfer-cleaning room according to claim 6, characterized in that: In the second stage, the equipment is transported in several sections by 1# belt conveyor; in the third stage, the equipment is directly transported as a whole by 2# belt conveyor; 2# belt conveyor is installed on the floor of the transfer-cleaning room.

8. The heavy concrete construction method for the transfer-cleaning room according to claim 6, characterized in that: 1# belt conveyor and 2# belt conveyor are both inclined, gradually rising from far away from the transfer-cleaning room to close to the transfer-cleaning room. The inclination angle is set as follows: when pouring heavy concrete in the cleaning room and when pouring heavy concrete in the transfer room, the angles of 1# belt conveyor and 2# belt conveyor are adjusted according to the size of the pouring space; according to the transmission efficiency of the belt conveyor and the compressive capacity of the steel plate, the pouring speed of concrete shall not exceed 7m 3 / h.

9. The heavy concrete construction method for the transfer-cleaning room according to claim 6, characterized in that: A material receiving port is set below the material distribution position of the 2# belt conveyor, and the heavy concrete flows into the chute through the material receiving port. The chute is within 1m above the pouring elevation. Protective cloth is laid on the lower part of the entire heavy concrete transportation route to prevent heavy concrete from dripping and contaminating the ground or equipment. A protective frame is set up at the transfer and handover point of the concrete of the 1# belt conveyor and the 2# belt conveyor, and the outside of the protective frame is completely covered with geotextile or fireproof cloth. A hopper is set below to collect the heavy concrete dripping during the concrete transfer project, and the collected heavy concrete is then sealed and transported out of the factory.

10. The heavy concrete construction method for the transfer-cleaning room according to claim 6, characterized in that: When pouring heavy concrete, it is poured in layers and sections, and construction joints are set between each layer and each section; when pouring in layers, pouring is carried out in batches, and the pouring thickness of each time shall not exceed 0.30m until one layer is poured; each construction joint contains a right-angle step structure, and the vertical side length of the step is ≥3cm to effectively block rays.

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