Earth block product formed by vacuum high-pressure packaging and forming method thereof

Abstract

The invention discloses an earthen block product formed by vacuum high-pressure packaging and a forming method thereof, the earthen block product comprises a prefabricated earthen block formed by wet composite soil mixed with cement through high-pressure forming, the prefabricated earthen block is arranged in a vacuum bag, and the vacuum bag tightly covers the prefabricated earthen block after being vacuumized and sealed; the prefabricated soil blocks subjected to vacuum packaging are wrapped with geotechnical cloth bags, and ports of the geotechnical cloth bags are closed and tightly sealed; the fiber reinforced cloth bag is tightened and wrapped outside the prefabricated soil block; the formed soil block is formed by adopting easily available soil raw materials, is not easy to digest when being used underwater after being sequentially glued and modified, has certain compressive strength and durability, and is sequentially provided with a vacuum bag, a geotechnical cloth bag and a fiber reinforced cloth bag from inside to outside, so that the prefabricated soil block is isolated from the external environment; seawater erosion and air blowing are avoided, inverted filtering and buffering are formed, prefabricated soil block ablation and material loss are further prevented, the compressive strength of the soil block product is improved, and land and underwater use can be met.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated blocks, and in particular to a vacuum high-pressure packaged clay block product and a molding method thereof. Background Art

[0002] In dam construction, flow blocking construction, flood prevention construction and flood relief, sandbags are usually used as stacking units. Sandbags have certain flexibility, are easy to stack, have good air-tightness, and can buffer the impact of water flow. Sand is not easily dissolved by water and can fill the sandbags to maintain the stacking shape. Sandbags have a high specific gravity and can withstand the pressure of water flow. However, due to the shortage of sand resources and the excessive exploitation of sea sand and river sand, the original structure of the seabed and riverbed has been destroyed, causing soil erosion and damaging the ecological environment. The country has implemented a series of control measures, resulting in the continuous increase in the cost of sand use and the difficulty in obtaining sand resources. Compared with sand resources, soil resources are abundant and easy to mine. Therefore, considering the use of readily available natural soil resources for shaping, as stacking units, and using them in dam construction, flow blocking, flood prevention and relief, etc., it responds to the resource protection and sustainable development strategy. Among them, loam and clay soil have the characteristics of sand such as flexibility, adaptability to stacking and high specific gravity, but because they are easy to absorb water, their mechanical properties are greatly reduced after absorbing water, which limits their use in underwater operations. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a vacuum high-pressure packaged clay block product and a molding method thereof to solve one or more problems raised in the above-mentioned background technology.

[0004] In order to achieve the above object, the technical solution of the present invention is as follows:

[0005] A soil block product formed by vacuum high-pressure packaging, wherein moist composite soil mixed with a binder is formed into a prefabricated soil block by high pressure, the prefabricated soil block is installed in a vacuum bag, the vacuum bag is evacuated and sealed, and is tightly wrapped around the outside of the prefabricated soil block, and the diameter of the vacuum bag is adapted to the cross-section of the prefabricated soil block; the prefabricated soil block after vacuum packaging is wrapped with a geotextile bag, the geotextile bag is straight-cylindrical, the bag diameter is larger than the cross-section area of ​​the prefabricated soil block, and the two end ports of the geotextile bag are closed and sealed; the outermost layer is a fiber-reinforced cloth bag, which is tightly wrapped around the prefabricated soil block.

[0006] Furthermore, the prefabricated soil blocks are formed into regular hexagonal columns under high pressure.

[0007] Furthermore, the binder is one of lime, cement and fly ash, or a combination of two or three of them.

[0008] The molding method for producing vacuum high-pressure packaged earth block products comprises the following steps:

[0009] S1: crushing soil blocks and cementing materials into small-sized particles and mixing them evenly to obtain composite soil;

[0010] S2: After the composite soil is screened as a whole to remove impurities, it is sprinkled with water to moisten it, thereby obtaining a moldable moist composite soil;

[0011] S3: The wet composite soil is pressed under high pressure to form a prefabricated soil block in a prefabricated shape, and the high pressure forming process of the wet composite soil is combined with a vacuum negative pressure environment;

[0012] S4: Put a vacuum bag on the prefabricated soil block, and heat-seal the end opening after vacuuming;

[0013] S5: Continue to place geotextile bags on the outer surface of the prefabricated soil blocks, and close and sew the openings of the geotextile bags;

[0014] S6: Fiber-reinforced cloth bags are placed on the outside of the prefabricated soil blocks and tightly tied at the ends.

[0015] Compared with the prior art, the vacuum high-pressure packaged clay block product and the molding method thereof of the present invention have the following beneficial effects:

[0016] The earthen block product is formed by using readily available soil raw materials. After being modified by gluing, it is not easy to dissolve when used underwater, and it has certain compressive strength and durability. The modified prefabricated earth blocks are provided with vacuum bags, geotextile bags and fiber-reinforced cloth bags from the inside to the outside, which isolate the prefabricated earth blocks from the external environment, avoid water erosion and wind weathering, and form backfiltration and buffering, further prevent the prefabricated earth blocks from melting and material loss, and further improve the compressive strength of the earthen block product. Since the prefabricated earth blocks themselves have a certain shape retention, compared with sandbags, the three-layer packaging wrapped outside has a longer service life; therefore, the earthen block product can not only be used on land, but also meet the requirements of underwater use. It has the characteristics of good comprehensive mechanical properties, excellent durability and long service life, and can be used as throwing materials in dam construction, flow blocking construction, flood control construction and flood fighting and rescue; the forming method of the earthen block product is simple and easy, the production cost is low, and the mass production efficiency and cost reduction effect are more prominent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A three-dimensional diagram of the appearance structure of the earthen block product disclosed in the present invention;

[0018] Figure 2 It is a three-dimensional diagram of the cross-sectional structure of the earthen block product disclosed in the present invention.

[0019] In the figure: 1. Prefabricated soil blocks; 2. Geotextile bags; 3. Vacuum bags; 4. Fiber-reinforced bags. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only the best embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] This embodiment provides a soil block product formed by vacuum high-pressure packaging. The soil raw materials of the soil block product are loam and clay. Since the compressive strength of loam and clay in the natural state is unstable, after being bagged for stacking, the stacking embankment cannot be compacted by external force. The pressure on the soil raw materials will be dispersed in the packaging bags, and the packaging bags are prone to failure. Therefore, in order to increase the underwater service life of the soil raw materials, not only the protection and filtration of the outer packaging are required, but also the soil raw materials need to be modified so that they have a certain compressive strength and increase the service life of the outer packaging;

[0022] First, the soil raw materials are modified by using a binder. The binders include lime, cement and fly ash. If only one of the components is used as the binder, the amount of lime added is 5%-15%, which can make the modified soil raw materials have good properties and meet the requirements and specifications for the use of soil raw materials. The amount of cement added is 3%-20%, and the mechanical properties of the soil raw materials are already very high. The amount of fly ash added is 10%-40%;

[0023] If any two or three combinations are used as the binder, the amount of cement added is 3%-20%, the amount of lime added is 1.5%-15%, and the amount of fly ash added is 0-20%. When lime and fly ash are combined, the ratio of the two is preferably 1:2-1:3, and the compressive strength performance is better. The ratio of cement and lime is preferably 2:1, and the durability performance is better. The ratio of cement, lime and fly ash is 2:1:1, and the comprehensive performance is the best.

[0024] During the modification process of the binder, the composite soil needs to be matched with the appropriate amount of water. According to the specific selected binder and its ratio, the optimal moisture content is tested with reference to the "Standard for Geotechnical Test Methods" to obtain the optimal test moisture content, which is used to guide the water consumption in the modification process. Considering that the prefabricated soil blocks are vacuum cured after forming, the optimal test moisture content is used as the base to increase the amount of water by 2% as the configuration moisture content. The moisture content of the moist composite soil is controlled at 15%-35%, and the amount of binder and its ratio should be adjusted accordingly;

[0025] like Figure 1-Figure 2As shown, the moist composite soil modified by watering the cementing material is formed into a prefabricated soil block 1 by high pressure, which eliminates the need for compaction operation after stacking, can improve the compressive strength of the prefabricated soil block 1, and improve the density and specific gravity of the prefabricated soil block 1, and has better comprehensive water pressure resistance. The prefabricated soil block 1 is formed into a long strip of regular hexagonal column by high pressure, which is conducive to automatic rolling into place during throwing. At the same time, its structure is conducive to the automatic stacking of the prefabricated soil block 1 to form a tight and seamless stacking state, reducing the technical difficulty of throwing construction, and improving the throwing construction efficiency and the success rate of throwing and stacking embankment.

[0026] In order to further improve the life of the prefabricated soil block 1, prevent the loss of its underwater materials, and protect it from water erosion and wind-blown weathering, a triple protective layer is used to protect and enhance it. First, a vacuum bag 3 is arranged outside the prefabricated soil block 1. The vacuum bag 3 also has a suitable caliber and is blown into a hexagonal cylinder structure. It has a small amount of surplus, which is convenient for installation. After vacuuming, the vacuum bag 3 is tightly wrapped on the outside of the geotextile bag 2 to isolate the prefabricated soil block 1 from the external environment and avoid water erosion and wind-blown weathering;

[0027] The vacuum-sealed prefabricated soil block 1 is installed in the geotextile bag 2. When the internal vacuum bag 3 fails, the geotextile bag 2 can also play a filtering role to prevent the loss of materials in the prefabricated soil block 1 and buffer the erosion of water flow. At the same time, it can also form a protection for the internal vacuum bag 3. Due to the insufficient mechanical properties of the geotextile bag 2, the geotextile bag 2 is straight-cylindrical, which has a large surplus, and the diameter area of ​​the bag tube is larger than the cross-sectional area of ​​the prefabricated soil block 1.

[0028] Finally, the outermost layer is a fiber-reinforced cloth bag 4. The encapsulated prefabricated soil block 1 is wrapped with a layer of fiber-reinforced cloth bag 4. The fiber-reinforced cloth bag 4 should be tensioned to apply a certain clamping force to improve the compressive capacity of the prefabricated soil block 1. In addition, the fiber-reinforced cloth bag 4 can increase the relative friction between the contact surfaces of adjacent soil block products and improve the ability of the embankment to withstand horizontal water pressure.

[0029] In addition, this embodiment also provides a molding method for producing the above-mentioned vacuum high-pressure packaging clay block product, comprising the following steps:

[0030] S1: Each batch of molding should use the same soil raw materials and cementing materials, and should use the same proportion. The soil raw materials should be loose dry loam or clay soil collected from the same region. The soil blocks and cementing materials should be crushed into small particles and evenly mixed to obtain composite soil;

[0031] Since lime needs to be digested, if the binder is lime or one of its components is lime, first mix the crushed lime with the soil raw materials and then pile them up, and let them sit for 2 days; finally, mix in the remaining components;

[0032] S2: The composite soil is passed through a 5 mm standard sieve to remove debris and large pieces of raw materials, and then watered to moisten it. The amount of watering is determined using the national standard test method. The final overall moisture content should be controlled at 15%-35%, thereby obtaining a moldable moist composite soil.

[0033] S3: The composite soil should be formed within 4 hours after being sprinkled with water for wetting. The wet composite soil is placed in the hexagonal mold of the molding equipment for high-pressure molding. The mold cavity of the hexagonal mold is connected to a vacuum pump. Before molding, the mold cavity loaded with the wet composite soil is evacuated to remove the gas in the wet composite soil to a certain extent, so that it is more compact after high-pressure molding.

[0034] S4: After the high-pressure forming is completed, three-layer packaging should be carried out immediately to facilitate the maintenance of the modified prefabricated soil block 1 formed by high-pressure forming; the innermost layer is a vacuum bag 3, and the vacuum bag 3 is placed outside the prefabricated soil block 1. After one end is heat-sealed and vacuumed, the other end is heat-sealed at the same time;

[0035] S5: Continue to put on the geotextile bag 2, the geotextile bag 2 has a large surplus, and close and sew the end opening of the geotextile bag 2;

[0036] S6: The outermost layer is a fiber-reinforced cloth bag 4, which is sleeved on the outside of the prefabricated soil block 1. The end opening of the fiber-reinforced cloth bag 4 is tied tightly to clamp the prefabricated soil block 1 and apply an initial clamping force.

[0037] The descriptions of the directional words such as "end", "inside" and "outside" mentioned in this article are based on Figure 1-Figure 2 These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation;

[0038] It should be pointed out that the percentages (%) involved in the ratios and contents mentioned in this article are all mass percentages;

[0039] Moreover, some of the above-mentioned terms may be used to express other meanings besides indicating orientation or positional relationships. For example, the term "on" may also be used to indicate a certain dependency or connection relationship in certain circumstances. A person skilled in the art may understand the specific meanings of these terms in the present invention according to the specific circumstances.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clay block product formed by vacuum high-pressure packaging, characterized in that: The wet composite soil mixed with the binder is formed into a prefabricated soil block by high pressure, and the prefabricated soil block is installed in a vacuum bag, and the vacuum bag is tightly wrapped around the outside of the prefabricated soil block after being evacuated and sealed, and the diameter of the vacuum bag is adapted to the cross section of the prefabricated soil block; The vacuum-sealed prefabricated soil block is wrapped with a geotextile bag, the geotextile bag is straight-cylindrical, the bag opening is larger than the cross-sectional area of ​​the prefabricated soil block, and the port of the geotextile bag is closed and sealed; The outermost layer is a fiber-reinforced cloth bag, and the fiber-reinforced cloth bag is tightly wrapped around the prefabricated soil block.

2. The vacuum high pressure packaged clay block product according to claim 1, characterized in that: The prefabricated soil block is formed into a regular hexagonal column under high pressure.

3. The vacuum high pressure packaged clay block product according to claim 1, characterized in that: The binder is one of lime, cement and fly ash, or a combination of two or three of them.

4. A molding method for producing a vacuum high pressure packaged earth block product as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: S1: crushing the soil block and the cementing material into small-sized particles, and uniformly mixing them to obtain composite soil; S2: After the composite soil is screened as a whole to remove impurities, it is sprinkled with water to moisten it, thereby obtaining the moldable moist composite soil; S3: The wet composite soil is pressed under high pressure to form the prefabricated soil block in a prefabricated shape, and the high pressure forming process of the wet composite soil is carried out in a vacuum negative pressure environment; S4: putting the vacuum bag on the outside of the prefabricated soil block, and heat-sealing the end opening after vacuuming; S5: Continue to place the geotextile bag outside the prefabricated soil block, and close and sew the opening of the geotextile bag; S6: The fiber-reinforced cloth bag is sheathed on the outside of the prefabricated soil block and is tightly bound at the end.

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