A secondary formed composite flood-prevention emergency large stone structure and a preparation method thereof

Abstract

The application discloses a kind of secondary forming composite flood-prevention large stone structures and preparation methods, and the flood-prevention large stone is composed of concrete, reinforcing cage, water stop and sandstone core.The shape of large stone is a regular quadrangular prism, with good integrity, large density, large size, good durability, difficult to be washed away by water flow and can be better fixed at the root stone pile;Preparation method is simple, and it is convenient for batch production.The preparation method and steps include: supporting the outer formwork on the plane bottom plate;Pouring concrete and lowering the reinforcing cage to form an 80mm thick bottom plate pouring area;After 7 days of curing, fill the sandstone in the inner formwork and compact it to form a sandstone core;Pouring concrete on the side and top of the large stone, cover the reinforcing cage cover;After 24 hours, demould the outer formwork, and then cure for 28 days to complete the final preparation.

Description

Technical Field

[0001] This invention relates to the field of flood control engineering technology, specifically to a two-stage molding composite material flood control and emergency rescue large stone structure and its preparation method. Background Technology

[0002] During extreme weather events, rivers experience high flow rates, rapid currents, and sudden rises in water levels during the flood season, leading to erosion of dams and riverbanks, severe soil and rock loss, and ultimately, landslides. In flood control projects, the placement of flood control stones is a common method for river regulation and disaster relief. After placement, these stones form foundation stones, reinforcing the base and subgrade of dams and riverbanks. The higher the density and the larger the size of the flood control stones, the better the control effect. However, traditionally, flood control stones are typically small, requiring wire mesh cages to gather small stones into a single unit before placement, which is time-consuming, labor-intensive, and uneconomical.

[0003] With the national policy of closing mountains to forests for environmental protection, the mining of stone has been further restricted, leading to a decrease in the supply of natural flood control stones and a surge in prices. Currently, artificial flood control stones are mainly divided into two categories: one type uses mud, sand, and cement as the main materials, mixed with various chemical reagents, and is made through firing or extrusion molding to create small concrete flood control stones; the other type uses flexible materials and concrete as the outer shell, with mud, sand, or steel slag as the inner core, resulting in a shell-like concrete flood control stone. The former has disadvantages such as environmental pollution and energy waste during firing, or poor water resistance and easy disintegration during extrusion molding, and both fired and extruded artificial flood control stones are relatively small in size. The latter, as the shell material, suffers from difficulties in core material preparation, resulting in flood control stones with smaller density and size. Therefore, finding artificial flood control stones to replace natural flood control stones has become an urgent matter.

[0004] Chinese Patent Publication No. CN107059791A discloses a steel slag core concrete protective stone and its manufacturing method. This protective stone design uses a reinforced concrete outer shell of a steel-plastic geogrid, with the core material being artificial stone blocks made of a steel slag mixture. However, it has the following drawbacks: the geogrid consists of six pieces connected together (the connection method is not explained), resulting in poor overall integrity and failing to effectively improve the overall tensile strength; due to insufficient stiffness of the geogrid, positioning during construction is difficult; the steel slag core is complex to manufacture, requiring the steel slag to be crushed, sieved, and then a binder added before being compressed and formed using a cold-pressing method; the protective stone is small in size, with a volume of only 0.074 m³. 3 .

[0005] Chinese Patent Publication No. CN204238179A discloses a cubic concrete-encased soil-filled protective stone. This protective stone uses a steel fiber mesh reinforced concrete shell, filled with silt, clay, water, and straw. However, it has the following drawbacks: the steel fiber mesh relies on welding for connection, and the top steel fiber mesh needs to be inserted into the soil core before being placed last, resulting in poor overall integrity between this part and other parts; due to insufficient rigidity of the steel fiber mesh, positioning it during construction is difficult, and it easily deviates from its original position when vibrated by a vibrating screen; the soil core production process is complex, requiring clay and straw to bind the silt, and the source of clay is limited due to national farmland protection policies; the finished stone is relatively small, with a volume of only 0.125 m³. 3 The soil core has a low density, resulting in a relatively small overall mass.

[0006] The composite material flood control boulder provided by this invention has an outer shell made of highly impermeable reinforced concrete, and the core material is unrestricted, making full use of waste materials. It does not require complex molding processes, allowing the flood control boulder to achieve a high density. Its unique square frustum shape results in a massive size, reaching up to 1.06m. 3 It is a novel design with great practical value. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a secondary-molded composite material flood control and disaster relief large stone structure and preparation method. The flood control large stone is required to have good integrity, high density, large size, good durability, and a shape that is difficult to be washed away by water flow and can be well stuck at the root stone pile; the preparation method is simple and easy to mass-produce.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical means:

[0009] A composite material flood control and disaster relief large stone structure with secondary molding includes concrete and a steel cage. The concrete and steel cage surround a reinforced concrete shell. A waterstop is provided at the bottom of the reinforced concrete shell. The reinforced concrete shell is filled with a sand and gravel core.

[0010] The concrete is divided into a pre-cast zone at the bottom and a post-cast zone above the pre-cast zone;

[0011] The steel cage is divided into a steel cage cover, a steel cage body, and stirrups. The top of the steel cage body is equipped with a steel cage cover with hooks.

[0012] The waterstop is welded around the bottom of the reinforcing steel cage, with the lower part of the waterstop in the pre-cast area and the upper part in the post-cast area.

[0013] The sand and gravel core consists of layered tailings encased in Yellow River silt. Compaction gaps are provided between the tailings and between the tailings and the inner surface of the reinforced concrete shell, and these gaps are filled with Yellow River silt. The filling with Yellow River silt facilitates the overall compaction of the sand and gravel core.

[0014] The following are further priority options:

[0015] The outer surface of the reinforced concrete shell has a bottom side length of 700mm, a top side length of 1200mm, a height of 1147mm, and a thickness of 80mm. The dimensions of the inner surface are the same as those of the outer surface of the sand and gravel core.

[0016] The steel cage is located in the middle of the reinforced concrete shell.

[0017] The steel cage has a bottom side length of 635mm, an top side length of 1105mm, a height of 1067mm, a steel bar diameter of 8mm, a vertical side length of 200mm and a top side length of 150mm, and two rows of steel bars are set horizontally on the side as stirrups, with the two rows of stirrups being 240mm from the top side and 380mm from the bottom side, respectively.

[0018] The steel bars of the steel cage are slightly bent inward to form an arc; each steel bar on the steel cage cover has hooks at both ends, which can be directly locked onto the lower steel cage body.

[0019] The center of the waterstop is flush with the top surface of the pre-cast area, so that the lower half of the waterstop is located in the pre-cast area and the upper half is located in the post-cast area.

[0020] The waterstop is made of 1mm thick galvanized steel sheet with a width of 100mm. The top and bottom surfaces of the waterstop have 10mm long, 45° bent edges. These edges are standard construction features for waterstops, ensuring good contact and a secure fit with the concrete, making it more difficult for water to penetrate.

[0021] The compaction interval between tailings is 200mm; the compaction interval between tailings and the reinforced concrete shell is 100mm.

[0022] A method for preparing a composite material large-block stone structure for flood control and disaster relief using a two-stage molding process includes the following steps:

[0023] (1) Two pairs of high rigid steel plates are used as the outer template. The outer template is provided with side wings and three pairs of opening holes. Three pairs of connecting bolts are used to connect the plates through the opening holes.

[0024] (2) Place the outer template on a flat base plate. The base plate can be made of wood, steel plate or flat ground. Use the weight of the outer template to connect with the base plate. Apply release agent to the inner side of the outer template and the base plate.

[0025] (3) Pour 40mm of concrete into the bottom of the inner side of the outer formwork, compact and level it with a vibrator, and then lower the steel cage so that the bottom surface of the steel cage is at the pouring surface at this time, and insert the waterstop into the pouring surface; before or after placing the steel cage, the waterstop needs to be connected and fixed, and then continue to pour a thick layer of concrete, compact it with a vibrator and then cure it to form the first pouring area. The first pouring area will solidify the lower part of the waterstop with the bottom end of the steel cage; the side section area of ​​the reinforced concrete shell of the first pouring area is not leveled, and the surface is roughened by sprinkling stones, imprinting grooves, etc., so that the contact between the first pouring area and the later pouring area is better.

[0026] (4) After the pre-cast area is cured, support rods are inserted on the inside and outside of the steel cage. Four inner formwork pieces are inserted on the inside of the inner support rods. The inner formwork is made of high-rigidity steel plate and consists of two winged inner formwork pieces and two wingless inner formwork pieces. The winged inner formwork pieces and the wingless inner formwork pieces are fastened together to form a stable whole. The bottom of the inner formwork is against the pre-cast area, and the size of the internal space formed is the same as the size of the sand and gravel core. However, in order to prevent the overflow of Yellow River silt when filling the sand and gravel core, the height of the inner formwork is greater than the height of the top surface of the sand and gravel core.

[0027] (5) Fill the inner template with sand and gravel core, fill a layer of compacted Yellow River silt according to the designed thickness, fill a layer of tailings on top, fill with Yellow River silt again, and then fill with tailings again, and so on until the sand and gravel core is filled. After the sand and gravel core reaches the required thickness, further compact the sand and gravel core using the compaction system to make the inside of the sand and gravel core dense.

[0028] (6) The compaction system includes a loading plate, jacks, and a reaction frame. The stroke of the loading plate is from the top of the inner template to the designed top surface of the sand and gravel core. The Yellow River silt is filled to the top of the inner template, and the reaction frame provides the reaction force. The loading plate compacts the Yellow River silt through the extension of the jacks. Compaction is stopped when the silt is compacted to the designed top surface of the sand and gravel core.

[0029] (7) Pour concrete into the post-cast area between the inner and outer formwork. Vibrate with a vibrator while pouring. After the concrete reaches the height of the steel cage, use a cantilever crane to remove the outer support rod, remove the inner support rod, remove the inner formwork, continue to pour the post-cast area and vibrate, so that the post-cast area completely fills the gap left by the support rod and the inner formwork, and the post-cast area is in close contact with the sand and gravel core.

[0030] (8) Cover the steel cage with the steel cage cover to form a closed steel cage with the steel cage body, and continue to pour concrete so that the upper part of the reinforced concrete shell also reaches 80mm, forming a complete reinforced concrete shell.

[0031] (9) Demold the outer template, then cure it, and the final preparation is completed.

[0032] The advantages of this invention are:

[0033] (1) The sand and gravel core uses Yellow River silt and tailings as raw materials, which are abundant and extremely cheap. The utilization and treatment of these wastes can turn waste into treasure, reduce ore mining, and help protect the environment.

[0034] (2) The composite structure of the sand and gravel core is reasonably designed, which can combine the Yellow River sediment and tailings well to form a dense "strong core".

[0035] (3) The reinforced concrete shell has a reasonable structural design that can meet the stress requirements and save materials; the construction process is simple and easy to mass-produce, which greatly reduces the production cost of flood control boulders.

[0036] (4) The shape of the flood control boulders is a regular square frustum, which is different from the common cube and cuboid, which is conducive to the erosion of the boulders; when combined with other shapes of flood control stones, they can form a better gradation.

[0037] (5) When the steel reinforcement cage is made, the steel bars are slightly bent into the inside of the truncated pyramid to form a certain arc, which makes the reinforced concrete shell of the flood control boulders less susceptible to collision and improves its impact resistance.

[0038] (6) The flood control boulders have good integrity, the reinforced concrete shell ensures sufficient impact resistance, the compacted sand and gravel core ensures sufficient quality, and the construction process enables the reinforced concrete shell and the sand and gravel core to be tightly combined.

[0039] (7) The flood control boulders are huge, with a volume of up to 1.06m. 3 With a total mass of 2.2 tons, it is highly suitable for flood control and disaster relief work and has extremely high practical value. Attached Figure Description

[0040] Figure 1 This is a structural diagram of the flood control large stone of the present invention.

[0041] Figure 2 This is a three-dimensional view of the flood control large stone steel cage of the present invention.

[0042] Figure 3 This is a detailed drawing of the steel cage cover of the flood control large stone steel cage of the present invention.

[0043] Figure 4 This is a three-dimensional view of the flood control large stone waterstop strip of the present invention.

[0044] Figure 5 This is a cross-sectional view of the flood control large stone waterstop strip of the present invention.

[0045] Figure 6 This is a structural diagram of the flood control large stone and sand core of the present invention.

[0046] Figure 7 This is a plan view of the preparation process of the flood control large stones of the present invention.

[0047] Figure 8 This is a three-dimensional diagram of the preparation process of the flood control large stones of the present invention.

[0048] Figure 9 This is an overall diagram of the outer mold during the preparation process of the flood control boulders of this invention.

[0049] Figure 10 This is a detailed drawing of the outer mold during the preparation process of the flood control boulders of this invention.

[0050] Figure 11 This is an overall diagram of the inner mold used in the preparation process of the flood control boulders of this invention.

[0051] Figure 12 This is a detailed diagram of the winged inner mold in the process of preparing the flood control boulders of this invention.

[0052] Figure 13 This is a detailed drawing of the inner mold without wings during the preparation process of the flood control boulders of this invention.

[0053] Figure 14 This is a three-dimensional view of the support rod used in the preparation process of the flood control boulders of this invention.

[0054] Figure 15 This is a compaction diagram of the sand and gravel core during the preparation of the flood control boulders of this invention.

[0055] Explanation of reference numerals in the attached drawings: 1-Concrete, 1.1-Pre-cast zone, 1.2-Post-cast zone, 2-Reinforcing cage, 2.1-Reinforcing cage cover, 2.2-Reinforcing cage body, 2.3-Stirrups, 3-Waterstop, 4-Sand and gravel core, 4.1-Yellow River silt, 4.2-Tails, 4.3-Design top surface of sand and gravel core, 5-Outer formwork, 6-Connecting bolts, 7-Outer support rod, 8-Inner support rod, 9-Inner formwork, 9.1-Inner formwork with wings, 9.2-Inner formwork without wings, 10-Loading plate, 11-Jack, 12-Reaction frame, 13-Base plate. Detailed Implementation

[0056] The following description is for illustrative purposes only and is intended to provide further detailed explanation of this application. The terminology used is only for describing particular implementations and is not intended to limit the exemplary implementations according to this application.

[0057] See Figure 1-6 It is understood that the composite material flood control and disaster relief large stone structure of the present invention, which is formed by secondary molding, is composed of concrete 1, steel cage 2, waterstop 3 and sand and gravel core 4.

[0058] See Figure 1 It can be seen that the concrete 1 and the steel cage 2 form a reinforced concrete shell, which is in the shape of a regular square truncated pyramid.

[0059] The specific dimensions of the reinforced concrete shell are as follows: the side length of the lower bottom surface is 700mm, the side length of the upper bottom surface is 1200mm, the height is 1147mm, and the thickness of the reinforced concrete shell is 80mm; the dimensions of the inner surface are the same as the dimensions of the outer surface of the sand and gravel core.

[0060] See Figure 2-3 It is known that the steel cage 2 is located in the middle of the reinforced concrete shell, with a bottom side length of 635mm, an top side length of 1105mm, a height of 1067mm, a steel bar diameter of 8mm, a vertical side length of 200mm, a bottom side length of 150mm, and two rows of steel bars arranged horizontally on the side as stirrups 2.3, respectively 240mm from the top side and 380mm from the bottom side; the steel bars of the steel cage 2 are slightly bent inward towards the truncated pyramid to form an arc; the steel cage 2 is divided into a steel cage cover 2.1, a steel cage body 2.2, and stirrups 2.3. Each steel bar on the steel cage cover 2.1 has hooks at both ends, which can be directly clamped onto the lower steel cage body 2.2, and the steel bars are connected by binding.

[0061] See Figure 4-5 , Figure 7 It can be seen that the waterstop 3 is welded to the bottom of the reinforcing steel along the circumference of the reinforcing steel cage 2. For the specific location, please refer to [link / reference needed]. Figure 7 The center of the waterstop 3 is flush with the top surface of the pre-cast area 1.1, so that the lower half of the waterstop 3 is located in the pre-cast area 1.1 and the upper half of the waterstop 3 is located in the post-cast area 1.2. There is still about 23mm of concrete as a protective layer between the waterstop 3 and the outermost part of the reinforced concrete shell. The waterstop 3 is made of 1mm thick galvanized steel plate with a width of 100mm. The top and bottom surfaces of the waterstop 3 are provided with 10mm long and 45° bent edges, which facilitate good contact with the concrete and a firm fit, making it more difficult for water to seep into the interior.

[0062] See Figure 6 It can be seen that the sand and gravel core 4 is a layered distribution of tailings 4.2 wrapped by Yellow River silt 4.1. There are compaction gaps between tailings 4.2 and between tailings 4.2 and reinforced concrete shell. The compaction gaps are filled with Yellow River silt 4.1, and the filling of Yellow River silt 4.1 facilitates the compaction of sand and gravel core 4.

[0063] The compaction interval between tailings 4.2 is 200mm; the compaction interval between tailings 4.2 and the reinforced concrete shell is 100mm. These compaction intervals refer to the thickness after compaction with a rammer during layering. Since rammers generally cannot achieve a very dense compaction, a compaction system, specifically jack 11, is required after filling until all the weighed soil and rock are incorporated, achieving the designed density.

[0064] See Figure 7-15 A method for preparing a composite material large-block stone structure for flood control and disaster relief using a two-stage molding process includes the following steps:

[0065] (1) See Figure 9 , Figure 10 Two pairs of high-rigidity steel plates with a thickness of more than 5mm are used as the outer template 5. The outer template 5 is provided with 90° bent side wings, and there are 3 pairs of opening holes on the side wings. 3 pairs of high-strength connecting bolts 6 are used to connect through the opening holes.

[0066] (2) See Figure 7 , Figure 8 Place the outer template 5 on the flat base plate 13. The base plate 13 can be made of wood, steel plate, or a flat ground. Use the weight of the outer template 5 to connect with the base plate 13. Apply a release agent to the inner side of the outer template 5 and the base plate 13.

[0067] (3) See Figure 7 , Figure 8 1. Pour 40mm thick concrete into the bottom inner side of the outer formwork 5. After compacting and leveling with a vibrator, lower the reinforcing cage 2 so that the bottom surface of the reinforcing cage 2 is at the pouring surface. Insert the waterstop 3 into the pouring surface. Before or after placing the reinforcing cage 2, the waterstop 3 needs to be connected and fixed. Then continue to pour 40mm thick concrete to make the concrete base slab 80mm thick. After compacting with a vibrator, cure for 7 days to form the pre-poured area 1.1. The lower part of the waterstop 3 is solidified with the bottom end of the reinforcing cage 2 in the pre-poured area 1.1. The side section area of ​​the reinforced concrete shell of the pre-poured area 1.1 is not leveled. Instead, the surface is roughened by sprinkling stones and imprinting grooves to make better contact with the pre-poured area 1.1 when the post-poured area 1.2 is poured.

[0068] (4) See Figure 7 , Figure 8 , Figure 11-14After the pre-cast area 1.1 has been cured for 7 days, support rods 8 are inserted on the inside and outside of the reinforcing cage 2. Four inner formwork pieces 9 are inserted inside the inner support rods 8. The inner formwork pieces 9 are made of high-rigidity steel plates with a thickness of more than 5mm and consist of two winged inner formwork pieces 9.1 and two wingless inner formwork pieces 9.2. The winged inner formwork pieces 9.1 and the wingless inner formwork pieces 9.2 are fastened together to form a stable whole. The bottom of the inner formwork pieces 9 rests against the pre-cast area 1.1, and the internal space formed is the same size as the sand and gravel core 4. However, in order to prevent the overflow of Yellow River silt 4.1 when filling the sand and gravel core 4, the height of the inner formwork pieces 9 is greater than the top surface height of the sand and gravel core 4, and the height difference is 100mm.

[0069] (5) See Figure 7 , Figure 8 In the inner template 9, fill the sand and gravel core 4 with a layer of Yellow River silt 4.1 with a thickness of 200mm. Then fill it with a layer of tailings 4.2 with a thickness of 100mm. Repeat this process of filling the sand and gravel core 4 with Yellow River silt 4.1 and tailings 4.2 until the sand and gravel core 4 is filled. The distance between the tailings 4.2 and the inner side of the inner template 9 should not be less than 100mm. During operation, pay attention to controlling the distance with a ruler and lay the sand and gravel core from the bottom to the top. Use quality control to ensure the overall density. Taking the test parameters of the materials used in this invention as an example, weigh 0.8t of dry Yellow River silt 4.1 and 0.3t of tailings 4.2. Pay attention to the different values ​​when the materials are from different sources. Each layer of Yellow River silt 4.1 needs to be compacted after it is laid. A small tamping machine can be used for this purpose. After the sand and gravel core 4 reaches the required thickness, further compact the sand and gravel core 4 using a compaction system to make the interior of the sand and gravel core 4 dense.

[0070] (6) See Figure 15 The compaction system consists of a loading plate 10, jacks 11, and a reaction frame 12. The stroke of the loading plate 10 is from the top of the inner template 9 to the designed top surface 4.3 of the sand and gravel core. Figure 15 In the process, the top surface 4.3 of the sand and gravel core is the top surface after the sand and gravel core 4 is fully compacted and reaches the design density requirement. During the filling process, before compaction is completed, its top surface is always higher than the top surface 4.3 of the sand and gravel core. The Yellow River silt 4.1 is filled to the top of the inner template 9, and the reaction force is provided by the reaction frame 12. The jack 11 extends and the loading plate 10 compacts the Yellow River silt 4.1. Compaction is stopped when it reaches the top surface 4.3 of the sand and gravel core. If there is any remaining Yellow River silt 4.1 after one compaction, it is filled into the top of the inner template 9 and compacted to the top surface 4.3 of the sand and gravel core. This process is repeated until all the weighed sand and gravel is compacted, so that the sand and gravel core 4 reaches the design density requirement.

[0071] (7) See Figure 6 , Figure 7The post-casting zone 1.2 of concrete 1 is poured between the inner formwork 9 and the outer formwork 5. While pouring, a vibrator is used to vibrate the concrete. After the concrete reaches the height of the reinforcing cage 2, the outer support rod 7, the inner support rod 8, and the inner formwork 9 are removed using a cantilever crane. The post-casting zone 1.2 is then poured and vibrated to completely fill the gaps left by the support rods and the inner formwork 9, and the post-casting zone 1.2 is in close contact with the sand and gravel core 4.

[0072] (8) See Figure 3 , Figure 6 and Figure 7 Cover the steel cage with the steel cage cover 2.1 to form a closed steel cage 2 with the steel cage body 2.2, and continue to pour concrete (1) so that the upper reinforced concrete shell also reaches 80mm, forming a complete reinforced concrete shell.

[0073] (9) After 24 hours of placement, the outer template 5 is demolded, and then cured for 28 days to complete the final preparation.

[0074] The construction process of this embodiment is simple and easy to streamline production; the raw material of the sand and gravel core is recycled waste, and the reinforced concrete shell meets the requirements of stress and economy. Therefore, the flood control boulders not only meet the requirements of environmental protection, but also have high economic value.

[0075] The above description is only a preferred embodiment of the present invention. The relevant physical and mechanical parameters used are actual experimental data in the process of this invention. They may vary depending on the material source, batch, and preparation process. Therefore, this does not limit the scope of the present invention. All equivalent structural changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A composite material flood control and disaster relief large-block stone structure formed by secondary molding, comprising concrete (1) and a steel cage (2), characterized in that: The concrete (1) and the steel cage (2) are poured to form a reinforced concrete shell. The reinforced concrete shell is a regular square truncated pyramid shape. A waterstop (3) is provided at the bottom of the reinforced concrete shell. The reinforced concrete shell is filled with a sand and gravel core (4). The concrete (1) is divided into a pre-cast area (1.1) at the bottom and a post-cast area (1.2) above the pre-cast area. The steel cage (2) is divided into a steel cage cover (2.1), a steel cage body (2.2) and stirrups (2.3). The top of the steel cage body (2.2) is provided with a steel cage cover (2.1) with hooks. The waterstop (3) is welded around the bottom of the steel reinforcement cage (2), with the lower part of the waterstop (3) in the pre-cast area (1.1) and the upper part of the waterstop (3) in the post-cast area (1.2). The sand and gravel core (4) is a layered tailings (4.2) wrapped with Yellow River silt (4.1). There are compaction gaps between the tailings (4.2) and between the tailings (4.2) and the inner surface of the reinforced concrete shell. The compaction gaps are filled with Yellow River silt (4.1). The outer surface of the reinforced concrete shell has a bottom side length of 700mm, an upper side side length of 1200mm, a height of 1147mm, a thickness of 80mm, and the inner surface dimensions are the same as the outer surface dimensions of the sand and gravel core (4).

2. The composite material flood control and emergency rescue large stone structure with secondary molding according to claim 1, characterized in that: The steel cage (2) is located in the middle of the reinforced concrete shell.

3. The composite material flood control and emergency rescue large stone structure with secondary molding according to claim 2, characterized in that: The bottom side of the steel cage (2) is 635mm, the top side is 1105mm, the height is 1067mm, the diameter of the steel bars is 8mm, the vertical spacing of the steel bars on the side and the top side is 200mm, the spacing of the steel bars on the bottom side is 150mm, and two rows of steel bars are set horizontally on the side as stirrups (2.3).

4. The composite material flood control and emergency rescue large stone structure with secondary molding according to claim 1, characterized in that: The steel bars of the steel cage (2) are slightly bent inward to form an arc; each steel bar on the steel cage cover (2.1) has hooks at both ends, which can be directly locked onto the lower steel cage body (2.2).

5. The composite material flood control and emergency rescue large stone structure with secondary molding according to claim 1, characterized in that: The center of the waterstop (3) is flush with the top surface of the pre-cast area (1.1), so that the lower half of the waterstop (3) is located in the pre-cast area (1.1) and the upper half of the waterstop (3) is located in the post-cast area (1.2).

6. The composite material flood control and emergency rescue large stone structure with secondary molding according to claim 1, characterized in that: The waterstop (3) is made of 1mm thick galvanized thin steel plate with a width of 100mm. The top and bottom surfaces of the waterstop (3) are provided with bent edges with a length of 10mm and an angle of 45°.

7. The composite material flood control and emergency rescue large stone structure with secondary molding according to claim 1, characterized in that: The compaction interval between tailings (4.2) is 200mm; the compaction interval between tailings (4.2) and the reinforced concrete shell is 100mm.

8. The method for preparing the composite material flood control and emergency rescue large stone structure by secondary molding according to claim 1, characterized in that, Includes the following steps: ① Two pairs of steel plates are used as the outer template (5). The outer template (5) is provided with side wings. The side wings are provided with 3 pairs of opening holes. 3 pairs of connecting bolts (6) are used to connect through the opening holes. ② Place the outer template (5) on the flat base plate (13). The base plate (13) is made of any material, such as wood, steel plate or flat ground. The outer template (5) is connected to the base plate (13) by its own weight. Apply a release agent to the inside of the outer template (5) and the base plate (13). ③ Pour 40mm of concrete into the bottom of the inner side of the outer formwork (5), compact and level it with a vibrator, and then lower the steel cage (2). Before or after placing the steel cage (2), the waterstop (3) needs to be connected and fixed. Then continue to pour concrete, compact it with a vibrator, and then cure it to form the first-poured area (1.1). The first-poured area (1.1) will solidify the lower part of the waterstop (3) with the bottom of the steel cage (2). The side section area of ​​the reinforced concrete shell of the first-poured area (1.1) is not leveled. Instead, it is roughened by sprinkling stones or imprinting grooves, so that the contact between the second-poured area (1.2) and the first-poured area (1.1) is better when pouring the second-poured area (1.2). ④ After the pre-cast area (1.1) is cured, support rods are inserted into the inner and outer sides of the steel cage (2), and four inner formwork (9) are inserted into the inner side of the inner support rod (8). The inner formwork (9) is made of steel plate and consists of two winged inner formwork (9.1) and two wingless inner formwork (9.2). The winged inner formwork (9.1) and the wingless inner formwork (9.2) are fastened together to form a stable whole. The bottom of the inner formwork (9) rests against the pre-cast area (1.1), and the size of the internal space formed is the same as that of the sand and gravel core (4). However, in order to prevent the overflow of Yellow River silt (4.1) when filling the sand and gravel core (4), the height of the inner formwork (9) is greater than the height of the top surface of the sand and gravel core (4). ⑤ Fill the inner template (9) with sand and gravel core (4), fill a layer of Yellow River silt (4.1) according to the designed thickness, fill a layer of tailings (4.2) on it, fill the Yellow River silt (4.1) again, and then fill the tailings (4.2) again. Repeat this process until the sand and gravel core (4) is filled. After the sand and gravel core (4) reaches the required thickness, further compact the sand and gravel core (4) using a compaction system to make the inside of the sand and gravel core (4) dense. ⑥ The compaction system includes a loading plate (10), a jack (11), and a reaction frame (12). The stroke of the loading plate (10) is from the top of the inner template (9) to the designed top surface of the sand and gravel core (4.3). Yellow River silt (4.1) is filled to the top of the inner template (9), and the reaction frame (12) provides the reaction force. The jack (11) extends and the loading plate (10) compacts the Yellow River silt (4.1). Compaction is stopped when the compaction reaches the designed top surface of the sand and gravel core (4.3). ⑦ Pour concrete (1) into the post-cast area (1.2) between the inner formwork (9) and the outer formwork (5). Vibrate the concrete while pouring. After the concrete reaches the height of the steel cage (2), use a cantilever crane to remove the outer support rod (7), remove the inner support rod (8), remove the inner formwork (9), continue to pour the post-cast area (1.2) and vibrate it so that the post-cast area (1.2) completely fills the gap left by the support rod and the inner formwork (9) and the post-cast area (1.2) is in close contact with the sand and gravel core (4). ⑧ Cover the steel cage with the steel cage cover (2.1) to form a closed steel cage (2) with the steel cage body (2.2), and continue to pour concrete so that the thickness of the upper reinforced concrete shell also reaches 80mm, forming a complete reinforced concrete shell; ⑨ Remove the outer template (5) from the mold, then cure it, and the final preparation is complete.

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