Geopolymer artificial lightweight aggregate concrete impermeable continuous wall structure suitable for foundation pit support engineering, construction method and manufacturing method of artificial aggregate

Abstract

The invention belongs to the technical field of enclosure building construction engineering and foundation pit excavation, and discloses a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit enclosure engineering, a construction method and a manufacturing method of artificial aggregate. The geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for the foundation pit support engineering comprises main reinforcements which are vertically arranged; the number of the main reinforcements is multiple, and the multiple main reinforcements are arranged in a rectangular array. The number of the stirrups is multiple; one stirrup is at least wound on two adjacent main reinforcements; the stirrups and the main reinforcements form a reinforcement cage; and the geopolymer artificial lightweight aggregate concrete is poured in the reinforcement cage.

Description

Technical Field

[0001] The invention belongs to the technical field of enclosure construction engineering and foundation pit excavation, and specifically relates to a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure and a construction method suitable for foundation pit enclosure engineering, and a method for making artificial aggregate. Background Art

[0002] With the expansion and increasing utilization of urban underground space, the construction of underground civil air defense projects, underground parking lots and urban infrastructure is increasing. In order to ensure the safety and normal operation of surrounding buildings and municipal facilities, and considering the problems such as groundwater infiltration that occur during the excavation of underground deep foundation pit projects, appropriate and effective deep foundation pit support measures must be taken. Underground continuous walls are widely used in urban underground space projects because of their small footprint, strong adaptability, high overall stiffness and excellent waterproof and soil-proof properties.

[0003] However, ordinary underground continuous wall structures waste a lot of materials and have high construction costs. In addition, when the concrete structure is exposed to humid or water-contacting conditions for a long time, it is susceptible to alkali-aggregate reaction, delayed formation reaction of calcium aluminate and dissolution of concrete by environmental water, which reduces its durability and reliability.

[0004] Therefore, there is an urgent need to provide a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure and construction method suitable for foundation pit retaining projects with stronger anti-seepage properties, higher structural durability and stability, and a method for making artificial aggregates to solve the above problems.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art structure, such as poor impermeability, poor durability and unreliable stability, and the purpose is to provide a geopolymer artificial lightweight aggregate concrete impermeable continuous wall structure suitable for foundation pit retaining projects.

[0007] The second object of the present invention is to provide a method for producing the geopolymer artificial lightweight aggregate concrete used in the anti-seepage continuous wall structure of the geopolymer artificial lightweight aggregate concrete in the above foundation pit retaining project, and the artificial aggregate used.

[0008] The third object of the present invention is to provide a construction method of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure applied to the above-mentioned foundation pit retaining project.

[0009] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is: a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering, the geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure comprises a plurality of connected structural walls, and two adjacent structural walls are connected by H-shaped steel;

[0010] The structural wall comprises:

[0011] Main reinforcement, the main reinforcement is arranged vertically; a plurality of the main reinforcements are arranged in a rectangular array;

[0012] Stirrups, wherein a plurality of stirrups are provided; one stirrup is at least wound around two adjacent main bars; the stirrups and the main bars form a bar cage;

[0013] Geopolymer artificial lightweight aggregate concrete, the geopolymer artificial lightweight aggregate concrete is poured in the reinforcement cage;

[0014] Wherein, the main reinforcement and stirrups are both threaded steel bars.

[0015] According to one embodiment of the present invention, the aggregate used in the geopolymer artificial lightweight aggregate concrete is industrial solid waste-based, unburned artificial aggregate;

[0016] The industrial solid waste-based unburned artificial aggregate is made of the following raw materials in parts by weight: 1000-1400 parts of fly ash, 500-750 parts of slag, 150-200 parts of alkali activator, and 150-300 parts of water.

[0017] According to one embodiment of the present invention, the cementitious material used in the geopolymer artificial lightweight aggregate concrete is made of fly ash, slag, silica fume and water;

[0018] The mass ratio of fly ash: slag: silica ash: water is 650-700: 350-400: 50-60: 150-200.

[0019] According to one embodiment of the present invention, the main reinforcement and the stirrups are tied by steel bars;

[0020] The main reinforcement and / or the stirrups are welded to the H-shaped steel.

[0021] The present invention also provides a method for preparing industrial solid waste-based unburned artificial aggregate, wherein the industrial solid waste-based unburned artificial aggregate comprises the following raw materials in parts by weight: 1000-1400 parts of fly ash, 500-750 parts of slag, 150-200 parts of alkali activator, and 150-300 parts of water;

[0022] The method for preparing the industrial solid waste-based non-burning artificial aggregate comprises the following steps:

[0023] S1, prepare an alkaline activator solution with a modulus range of 1.4-1.6, and cool for 2 hours;

[0024] S2. Pour the fly ash and slag of the calculated mass into the disc granulator, tilt the ball disc 45°, and stir at a speed of 35 r / min for 2 min to make the fly ash and slag evenly mixed;

[0025] S3, maintain the inclination angle and rotation speed of the ball disc, continue stirring, and spray the alkali activator solution therein until the solution mass reaches the designed proportion;

[0026] S4. Increase the speed of the ball plate to 60r / min, spray water according to the shape of the aggregate to assist in shaping, so that the material adheres to the surface of the already formed core body, and the core body rolls as the ball plate rotates to form a large sphere;

[0027] S5. Sprinkle dry fly ash into the ball tray (the amount of fly ash added at this time is very small, just used to make some fly ash adhere to the surface of the aggregate and form it faster, the basic amount is about 2-5g), roll and granulate for 2 minutes to obtain industrial solid waste-based unburned artificial aggregate.

[0028] According to one embodiment of the present invention, the alkali activator is composed of sodium silicate, sodium hydroxide and water in a weight ratio of 100:800-900:150-200.

[0029] The present invention also provides a construction method of a geopolymer artificial lightweight aggregate concrete impermeable continuous wall structure suitable for the above-mentioned foundation pit retaining project, the construction method comprising the steps of:

[0030] SS1. Preparation before construction: clean the construction site and conduct positioning inspection on the construction ground to ensure that underground pipelines and other obstacles in the construction area have been cleaned or properly handled. After completion, draw the axis of the underground continuous wall at the planned location;

[0031] SS2. According to the construction drawings, guide walls are constructed on both sides of the underground continuous wall axis. The guide walls are made of C30 concrete and equipped with bidirectional steel bars. The depth of the guide walls is 1.5 to 2.5 m, and the bottom is placed in the original soil layer.

[0032] SS3. Use a rotary drilling machine to dig the groove section between the constructed guide walls to form a trench, and then clean the trench;

[0033] SS4. According to the construction drawings, tie the longitudinal main reinforcement and stirrups into a reinforcement cage. The tying sequence should strictly follow the construction requirements of "main reinforcement first, then stirrups". After tying, weld them to the inner wall of the prefabricated H-shaped steel, and then hoist the entire reinforcement cage into place;

[0034] SS5. Connect the joint pipe with other pipes or equipment used for underground continuous wall construction according to design requirements, ensure that the interface is well sealed, and use temporary support devices to fix the joint pipe in the correct position to ensure its stability;

[0035] SS6. Prepare geopolymer artificial lightweight aggregate concrete according to the mix ratio and preparation process and pour it into the wall reinforcement cage. After pouring, pull out the joint pipe and complete the production of the continuous wall structure after vibration.

[0036] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0037] The present invention proposes a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining projects, which has the advantages of corrosion resistance, penetration resistance and density, improves the durability and stability of the continuous wall structure, and is lighter and easier to construct than traditional concrete underground continuous walls, saves labor costs and greatly improves economic benefits.

[0038] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0040] Figure 1 It is a schematic structural diagram of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering in an embodiment of the present invention, viewed from a bottom up perspective;

[0041] Figure 2 It is a structural schematic diagram of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering in an embodiment of the present invention from a front view perspective;

[0042] Figure 3 This is a flowchart of the steps of a method for producing industrial solid waste-based, fire-free artificial aggregate in an embodiment of the present invention;

[0043] Figure 4 This is a construction process diagram of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering in an embodiment of the present invention;

[0044] Figure 5 A sample particle map of industrial solid waste-based unburned artificial aggregate generated in Example 1 of the present invention;

[0045] Figure 6 A sample particle map of industrial solid waste-based unburned artificial aggregate generated in Example 2 of the present invention;

[0046] Figure 7 A sample particle map of industrial solid waste-based unburned artificial aggregate generated in Example 3 of the present invention;

[0047] Figure 8 The sample particle map of industrial solid waste-based unburned artificial aggregate generated in Example 4 of the present invention

[0048] Fig. 9 A sample particle map of industrial solid waste-based unburned artificial aggregate generated in Example 5 of the present invention;

[0049] Fig.10 This is a sample particle diagram of industrial solid waste-based, fire-free artificial aggregate generated in Example 6 of the present invention.

[0050] Description of the main components in the figure:

[0051] 1. H-shaped steel; 2. Main reinforcement; 3. Stirrups; 4. Geopolymer artificial lightweight aggregate concrete; 5. Industrial solid waste-based unburned artificial aggregate.

[0052] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0054] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Attached Figure 1 and attached Figure 2 Disclosed is a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering; Figure 3 Disclosed is a flowchart of the steps of a method for producing industrial solid waste-based unburned artificial aggregate; Figure 4 Disclosed is a construction process diagram of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering; Figures 5 to 10 Disclosed are sample particle diagrams of industrial solid waste-based, fire-free artificial aggregates generated in Examples 1 to 6.

[0057] like Figure 1 to Figure 2 As shown, the geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering of the present invention comprises a plurality of connected structural walls, and two adjacent structural walls are connected by H-shaped steel 1;

[0058] The structural wall comprises:

[0059] A main rib 2, wherein the main rib 2 is vertically arranged; a plurality of the main ribs 2 are arranged in a rectangular array;

[0060] Stirrups 3, wherein a plurality of stirrups 3 are provided; one stirrup 3 is at least wound around two adjacent main bars 2; the stirrups 3 and the main bars 2 form a reinforcement cage;

[0061] Geopolymer artificial lightweight aggregate concrete 4, the geopolymer artificial lightweight aggregate concrete 4 is poured in the reinforcement cage;

[0062] Wherein, the main reinforcement 2 and stirrups 3 are both threaded steel bars.

[0063] On the one hand, the present invention utilizes geopolymer artificial lightweight aggregate concrete to replace traditional concrete materials, and adopts green materials such as fly ash, slag and alkali activator to reduce dependence on traditional resources, thereby reducing carbon emissions and damage to the environment; on the other hand, based on the characteristics of early strength, high density and strong durability of geopolymer concrete, the stiffness of the underground continuous wall of the deep foundation pit can be greatly improved, the water seepage rate of the underground continuous wall of the deep foundation pit can be reduced, and the service life of the underground continuous wall of the deep foundation pit can be extended.

[0064] In a specific implementation of this embodiment, the geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering, the aggregate used in the geopolymer artificial lightweight aggregate concrete 4 is industrial solid waste-based unburned artificial aggregate 5;

[0065] The industrial solid waste-based unburned artificial aggregate 5 is made of the following raw materials in parts by weight: 1000-1400 parts of fly ash, 500-750 parts of slag, 150-200 parts of alkali activator, and 150-300 parts of water.

[0066] In a specific implementation of this embodiment, the geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering, the cementitious material used in the geopolymer artificial lightweight aggregate concrete is made of fly ash, slag, silica fume and water;

[0067] The mass ratio of fly ash: slag: silica ash: water is 650-700: 350-400: 50-60: 150-200.

[0068] In a specific implementation of this embodiment, the geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering, the main reinforcement 2 and the stirrup 3 are tied by steel bars;

[0069] The main reinforcement 2 and / or the stirrup 3 are welded to the H-shaped steel 1 .

[0070] Please refer to the attached Figure 3 The present invention also provides a method for producing industrial solid waste-based unburned artificial aggregate, which is applied to the above-mentioned geopolymer artificial light aggregate concrete used in the anti-seepage continuous wall structure of the geopolymer artificial light aggregate concrete suitable for foundation pit enclosure engineering. The industrial solid waste-based unburned artificial aggregate 5 is made of the following raw materials in parts by weight: 1000-1400 parts of fly ash, 500-750 parts of slag, 150-200 parts of alkali activator, and 150-300 parts of water;

[0071] The method for preparing the industrial solid waste-based non-burning artificial aggregate comprises the following steps:

[0072] S1, prepare an alkaline activator solution with a modulus range of 1.4-1.6, and cool for 2 hours;

[0073] S2. Pour the fly ash and slag according to the calculated mass (the required number of precursors is obtained according to the calculated fraction ratio) into the disc granulator, tilt the ball disc 45°, and stir at a speed of 35r / min for 2min to make the fly ash and slag uniform;

[0074] S3, maintain the inclination angle and rotation speed of the ball disc, continue stirring, and spray the alkali activator solution therein until the solution mass reaches the designed proportion;

[0075] S4. Increase the speed of the ball plate to 60r / min, spray water according to the shape of the aggregate to assist in shaping, so that the material adheres to the surface of the already formed core body, and the core body rolls as the ball plate rotates to form a large sphere;

[0076] S5. Sprinkle dry fly ash into the ball tray, spheronize and granulate for 2 minutes, and perform aggregate curing and screening to obtain industrial solid waste-based unburned artificial aggregate. The aggregate curing and screening are performed in accordance with "Aggregates for High Performance Concrete" JG / T568-2019;

[0077] Wherein, dry fly ash is sprinkled into the ball tray. The amount of fly ash added at this time is very small, which is only used to make some fly ash adhere to the surface of aggregate and form it faster. The basic amount (per 100g of aggregate) of dry fly ash used is 2-5g.

[0078] In a specific implementation of this embodiment, in the method for producing industrial solid waste-based fire-free artificial aggregate, the alkali activator is composed of sodium silicate, sodium hydroxide and water in a weight ratio of 100:800-900:150-200.

[0079] The cementitious material and the industrial solid waste-based unburned artificial aggregate 5 are successively placed in a mixer for stirring, and after ensuring that the aggregate is fully mixed into the cementitious material, the geopolymer artificial lightweight aggregate concrete 4 is manufactured.

[0080] Please refer to the attached Figure 4 The present invention also provides a construction method of a geopolymer artificial lightweight aggregate concrete impermeable continuous wall structure suitable for the above-mentioned foundation pit retaining project, the construction method comprising the steps of:

[0081] SS1. Preparation before construction: clean the construction site and conduct positioning inspection on the construction ground to ensure that underground pipelines and other obstacles in the construction area have been cleaned or properly handled. After completion, draw the axis of the underground continuous wall at the planned location;

[0082] SS2. According to the construction drawings, guide walls are constructed on both sides of the underground continuous wall axis. The guide walls are made of C30 concrete and equipped with bidirectional steel bars. The depth of the guide walls is 1.5 to 2.5 m, and the bottom is placed in the original soil layer.

[0083] SS3. Use a rotary drilling machine to dig the groove section between the constructed guide walls to form a trench, and then clean the trench;

[0084] SS4. According to the construction drawing, the longitudinal main reinforcement 2 and stirrups 3 are tied to form a reinforcement cage. The tying sequence should strictly follow the construction requirement of "main reinforcement first, then stirrups". After tying, they are welded to the inner wall of the prefabricated H-shaped steel 1, and then the entire reinforcement cage is hoisted into place;

[0085] SS5. Connect the joint pipe (the joint pipe is a connection part in the concrete pump truck, used to transport concrete mortar, and can be removed after pouring concrete) with other pipes or equipment used for underground continuous wall construction according to the design requirements, ensure that the interface is well sealed, and use a temporary support device to fix the joint pipe in the correct position to ensure its stability;

[0086] SS6. Prepare geopolymer artificial lightweight aggregate concrete 4 according to the mix ratio and preparation process and pour it into the wall reinforcement cage. After pouring, pull out the joint pipe and complete the production of the continuous wall structure after vibration.

[0087] The present invention provides a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure and a construction method and an artificial aggregate production method suitable for foundation pit retaining projects. Compared with the existing underground continuous wall structure, the structure has higher strength and rigidity and better anti-seepage performance, can withstand greater water and soil pressure, and effectively prevent groundwater from seeping into the foundation pit; at the same time, the geopolymer artificial lightweight aggregate concrete also has good corrosion resistance and durability, can be used for a long time in harsh environments, and has broad application prospects.

[0088] Example 1

[0089] This embodiment provides a specific application of a construction method of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering;

[0090] This embodiment uses homemade concrete, which contains fly ash, slag, silica powder, alkali activator (, water reducing agent) and a certain amount of water. The water reducing agent is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. Most of them are anionic surfactants, such as lignin sulfonate, naphthalene sulfonate formaldehyde polymer, etc. The water reducing agent added to the concrete mixture (formed by fly ash and slag) has a dispersing effect on cement particles, can improve its workability, reduce unit water consumption, improve the fluidity of the concrete mixture (formed by fly ash and slag), or reduce unit cement consumption, which has a positive significance for saving cement.

[0091] The construction method of the underground continuous wall is as follows:

[0092] 1. Preparation before construction: clean up the construction site and conduct positioning inspection on the construction ground to ensure that underground pipelines and other obstacles in the construction area have been cleaned or properly handled. After completion, draw the axis of the underground continuous wall at the planned location;

[0093] 2. According to the construction drawings, guide walls are constructed on both sides of the underground continuous wall axis. The guide walls are made of C30 concrete and equipped with bidirectional steel bars. The depth of the guide walls is 1.5 to 2.5 meters, and the bottom is placed in the original soil layer;

[0094] 3. Use a rotary drilling machine to dig the groove section between the constructed guide walls to form a trench, and then clean the trench;

[0095] 4. According to the construction drawing, the longitudinal main reinforcement 2 and stirrups 3 are tied to form a (steel) reinforcement cage, in which the tying sequence should strictly follow the construction requirement of "main reinforcement first, then stirrups". After tying, they are welded to the inner wall of the prefabricated H-shaped steel 1, and then the entire reinforcement cage is hoisted into place;

[0096] 5. Connect the joint pipe with other pipes or equipment used for underground continuous wall construction according to the design requirements, ensure that the interface is well sealed, and use a temporary support device to fix the joint pipe in the correct position (to facilitate the concrete pump truck to pour concrete to the location of the underground continuous wall construction part) to ensure its stability;

[0097] 6. Prepare the industrial solid waste-based, unburned artificial aggregate 6 according to the raw material requirements: weigh the raw materials by weight: 1353 parts of fly ash, 580 parts of slag, 44 parts of sodium hydroxide, 112 parts of sodium silicate, and 189 parts of water. The preparation method includes the following steps: evenly mix the weighed raw materials and put them into a disc granulator; turn on the disc granulator and control the speed of the disc granulator to 35r / min to mix the alkaline solution with the materials for granulation, increase the speed of the disc granulator to 60r / min, continue to spray clean water to assist in molding, stop spraying clean water when the sample molding effect is the best, and finally roll and granulate for two minutes to obtain the industrial solid waste-based, unburned artificial aggregate (please refer to the attached Figure 5 );

[0098] 7. According to the raw material requirements, the geopolymer artificial lightweight aggregate concrete 4 is prepared, fly ash, slag, silica fume and water are mixed in a weight ratio of 650-700: 350-400: 50-60: 150-200, and stirred to obtain a cementitious material. The cementitious material and the industrial solid waste-based unburned artificial aggregate 6 are successively put into a mixer for stirring. After ensuring that the aggregate is fully mixed into the cementitious material, the geopolymer artificial lightweight aggregate concrete 4 is prepared and can be poured in the next step;

[0099] 8. Pour the prepared geopolymer artificial lightweight aggregate concrete 4 into the wall reinforcement cage, pull out the joint pipe after pouring, and complete the production of the continuous wall structure after vibrating.

[0100] Example 2

[0101] This embodiment provides another specific application of a construction method of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering. The difference between this embodiment and embodiment 1 is that the weight parts of raw materials used to prepare the industrial solid waste-based unburned artificial aggregate 6 are different, specifically:

[0102] This embodiment uses homemade concrete, which contains fly ash, slag, silica fume, alkali activator (, water reducing agent) and a certain amount of water.

[0103] The construction method of the underground continuous wall is as follows:

[0104] 1. Preparation before construction: clean up the construction site and conduct positioning inspection on the construction ground to ensure that underground pipelines and other obstacles in the construction area have been cleaned or properly handled. After completion, draw the axis of the underground continuous wall at the planned location;

[0105] 2. According to the construction drawings, guide walls are constructed on both sides of the underground continuous wall axis. The guide walls are made of C30 concrete and equipped with bidirectional steel bars. The depth of the guide walls is 1.5 to 2.5 meters, and the bottom is placed in the original soil layer;

[0106] 3. Use a rotary drilling machine to dig the groove section between the constructed guide walls to form a trench, and then clean the trench;

[0107] 4. According to the construction drawing, tie the longitudinal main reinforcement 2 and stirrups 3 into a reinforcement cage. The tying sequence should strictly follow the construction requirement of "main reinforcement first, then stirrups". After tying, weld them to the inner wall of the prefabricated H-shaped steel 1, and then hoist the entire reinforcement cage into place;

[0108] 5. Connect the joint pipe with other pipes or equipment used for underground continuous wall construction according to the design requirements, ensure that the interface is well sealed, and use a temporary support device to fix the joint pipe in the correct position to ensure its stability;

[0109] 6. Prepare the industrial solid waste-based unburned artificial aggregate 6 according to the raw material requirements: weigh the raw materials by weight: 1142 parts of fly ash, 548 parts of slag, 51 parts of sodium hydroxide, 139 parts of sodium silicate, and 209 parts of water. The preparation method includes the following steps: evenly mix the weighed raw materials and put them into a disc granulator; turn on the disc granulator and control the speed of the disc granulator to 35r / min to mix the alkaline solution with the materials for granulation, increase the speed of the disc granulator to 60r / min, continue to spray clean water to assist in molding, stop spraying clean water when the sample molding effect is the best, and finally roll and granulate for two minutes to obtain the industrial solid waste-based unburned artificial aggregate (please refer to the attached Figure 6 );

[0110] 7. According to the raw material requirements, the geopolymer artificial lightweight aggregate concrete 4 is prepared, fly ash, slag, silica fume and water are mixed in a weight ratio of 650-700:350-400:50-60:150-200, and stirred to obtain a cementitious material. The cementitious material and the industrial solid waste-based unburned artificial aggregate 6 described in the construction method 6 are successively put into a mixer for stirring. After ensuring that the aggregate is fully mixed into the cementitious material, the geopolymer artificial lightweight aggregate concrete 4 is prepared and can be poured in the next step;

[0111] 8. Pour the prepared geopolymer artificial lightweight aggregate concrete 4 into the wall reinforcement cage, pull out the joint pipe after pouring, and complete the production of the continuous wall structure after vibrating.

[0112] Example 3

[0113] This embodiment provides another specific application of a construction method of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit enclosure engineering. The difference between this embodiment and any one of Embodiments 1 and 2 is that the weight of raw materials used to prepare the industrial solid waste-based unburned artificial aggregate 6 is different, specifically:

[0114] This embodiment uses homemade concrete, which contains fly ash, slag, silica fume, alkali activator (, water reducing agent) and a certain amount of water.

[0115] The construction method of the underground continuous wall is as follows:

[0116] 1. Preparation before construction: clean up the construction site and conduct positioning inspection on the construction ground to ensure that underground pipelines and other obstacles in the construction area have been cleaned or properly handled. After completion, draw the axis of the underground continuous wall at the planned location;

[0117] 2. According to the construction drawings, guide walls are constructed on both sides of the underground continuous wall axis. The guide walls are made of C30 concrete and equipped with bidirectional steel bars. The depth of the guide walls is 1.5 to 2.5 meters, and the bottom is placed in the original soil layer;

[0118] 3. Use a rotary drilling machine to dig the groove section between the constructed guide walls to form a trench, and then clean the trench;

[0119] 4. According to the construction drawing, tie the longitudinal main reinforcement 2 and stirrups 3 into a reinforcement cage. The tying sequence should strictly follow the construction requirement of "main reinforcement first, then stirrups". After tying, weld them to the inner wall of the prefabricated H-shaped steel 1, and then hoist the entire reinforcement cage into place;

[0120] 5. Connect the joint pipe with other pipes or equipment used for underground continuous wall construction according to the design requirements, ensure that the interface is well sealed, and use a temporary support device to fix the joint pipe in the correct position to ensure its stability;

[0121] 6. Prepare the industrial solid waste-based unburned artificial aggregate 6 according to the raw material requirements: weigh the raw materials by weight: 1317 parts of fly ash, 597 parts of slag, 39 parts of sodium hydroxide, 151 parts of sodium silicate, and 198 parts of water. The preparation method includes the following steps: evenly mix the weighed raw materials and put them into a disc granulator; turn on the disc granulator and control the speed of the disc granulator to 35r / min to mix the alkaline solution with the materials for granulation, increase the speed of the disc granulator to 60r / min, continue to spray clean water to assist in molding, stop spraying clean water when the sample molding effect is the best, and finally roll and granulate for two minutes to obtain the industrial solid waste-based unburned artificial aggregate (please refer to the attached Figure 7 );

[0122] 7. According to the raw material requirements, the geopolymer artificial lightweight aggregate concrete 4 is prepared, fly ash, slag, silica fume and water are mixed in a weight ratio of 650-700:350-400:50-60:150-200, and stirred to obtain a cementitious material. The cementitious material and the industrial solid waste-based unburned artificial aggregate 6 described in the construction method 6 are successively put into a mixer for stirring. After ensuring that the aggregate is fully mixed into the cementitious material, the geopolymer artificial lightweight aggregate concrete 4 is prepared and can be poured in the next step;

[0123] 8. Pour the prepared geopolymer artificial lightweight aggregate concrete 4 into the wall reinforcement cage, pull out the joint pipe after pouring, and complete the production of the continuous wall structure after vibrating.

[0124] Example 4

[0125] This embodiment provides another specific application of a construction method of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering. The difference between this embodiment and any one of the embodiments 1 to 3 is that the weight of the raw materials used to make the industrial solid waste-based unburned artificial aggregate 6 is different, specifically:

[0126] This embodiment uses homemade concrete, which contains fly ash, slag, silica fume, alkali activator (, water reducing agent) and a certain amount of water.

[0127] The construction method of the underground continuous wall is as follows:

[0128] 1. Preparation before construction: clean up the construction site and conduct positioning inspection on the construction ground to ensure that underground pipelines and other obstacles in the construction area have been cleaned or properly handled. After completion, draw the axis of the underground continuous wall at the planned location;

[0129] 2. According to the construction drawings, guide walls are constructed on both sides of the underground continuous wall axis. The guide walls are made of C30 concrete and equipped with bidirectional steel bars. The depth of the guide walls is 1.5 to 2.5 meters, and the bottom is placed in the original soil layer;

[0130] 3. Use a rotary drilling machine to dig the groove section between the constructed guide walls to form a groove, and perform chute treatment on the groove;

[0131] 4. According to the construction drawing, tie the longitudinal main reinforcement 2 and stirrups 3 into a reinforcement cage. The tying sequence should strictly follow the construction requirement of "main reinforcement first, then stirrups". After tying, weld them to the inner wall of the prefabricated H-shaped steel 1, and then hoist the entire reinforcement cage into place;

[0132] 5. Connect the joint pipe with other pipes or equipment used for underground continuous wall construction according to the design requirements, ensure that the interface is well sealed, and use a temporary support device to fix the joint pipe in the correct position to ensure its stability;

[0133] 6. Prepare the industrial solid waste-based unburned artificial aggregate 6 according to the raw material requirements: weigh the raw materials by weight: 1119 parts of fly ash, 746 parts of slag, 38 parts of sodium hydroxide, 126 parts of sodium silicate, and 212 parts of water. The preparation method includes the following steps: evenly mix the weighed raw materials and put them into a disc granulator; turn on the disc granulator and control the speed of the disc granulator to 35r / min to mix the alkaline solution with the materials for granulation, increase the speed of the disc granulator to 60r / min, continue to spray clean water to assist in molding, stop spraying clean water when the sample molding effect is the best, and finally roll and granulate for two minutes to obtain the industrial solid waste-based unburned artificial aggregate (please refer to the attached Figure 8 );

[0134] 7. According to the raw material requirements, the geopolymer artificial lightweight aggregate concrete 4 is prepared, fly ash, slag, silica fume and water are mixed in a weight ratio of 650-700:350-400:50-60:150-200, and stirred to obtain a cementitious material. The cementitious material and the industrial solid waste-based unburned artificial aggregate 6 described in the construction method 6 are successively put into a mixer for stirring. After ensuring that the aggregate is fully mixed into the cementitious material, the geopolymer artificial lightweight aggregate concrete 4 is prepared and can be poured in the next step;

[0135] 8. Pour the prepared geopolymer artificial lightweight aggregate concrete 4 into the wall reinforcement cage, pull out the joint pipe after pouring, and complete the production of the continuous wall structure after vibrating.

[0136] Example 5

[0137] This embodiment provides another specific application of a construction method of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering. The difference between this embodiment and any one of the embodiments 1 to 4 is that the weight of the raw materials used to make the industrial solid waste-based unburned artificial aggregate 6 is different, specifically:

[0138] This embodiment uses homemade concrete, which contains fly ash, slag, silica fume, alkali activator (, water reducing agent) and a certain amount of water.

[0139] The construction method of the underground continuous wall is as follows:

[0140] 1. Preparation before construction: clean up the construction site and conduct positioning inspection on the construction ground to ensure that underground pipelines and other obstacles in the construction area have been cleaned or properly handled. After completion, draw the axis of the underground continuous wall at the planned location;

[0141] 2. According to the construction drawings, guide walls are constructed on both sides of the underground continuous wall axis. The guide walls are made of C30 concrete and equipped with bidirectional steel bars. The depth of the guide walls is 1.5 to 2.5 meters, and the bottom is placed in the original soil layer;

[0142] 3. Use a rotary drilling machine to dig the groove section between the constructed guide walls to form a trench, and then clean the trench;

[0143] 4. According to the construction drawing, tie the longitudinal main reinforcement 2 and stirrups 3 into a reinforcement cage. The tying sequence should strictly follow the construction requirement of "main reinforcement first, then stirrups". After tying, weld them to the inner wall of the prefabricated H-shaped steel 1, and then hoist the entire reinforcement cage into place;

[0144] 5. Connect the joint pipe with other pipes or equipment used for underground continuous wall construction according to the design requirements, ensure that the interface is well sealed, and use a temporary support device to fix the joint pipe in the correct position to ensure its stability;

[0145] 6. Prepare the industrial solid waste-based unburned artificial aggregate 6 according to the raw material requirements: weigh the raw materials by weight: 1028 parts of fly ash, 685 parts of slag, 35 parts of sodium hydroxide, 154 parts of sodium silicate, and 260 parts of water. The preparation method includes the following steps: evenly mix the weighed raw materials and put them into a disc granulator; turn on the disc granulator and control the speed of the disc granulator to 35r / min to mix the alkaline solution with the materials for granulation, increase the speed of the disc granulator to 60r / min, continue to spray clean water to assist in molding, stop spraying clean water when the sample molding effect is the best, and finally roll and granulate for two minutes to obtain the industrial solid waste-based unburned artificial aggregate (please refer to the attached Fig. 9 );

[0146] 7. According to the raw material requirements, the geopolymer artificial lightweight aggregate concrete 4 is prepared, fly ash, slag, silica fume and water are mixed in a weight ratio of 650-700:350-400:50-60:150-200, and stirred to obtain a cementitious material. The cementitious material and the industrial solid waste-based unburned artificial aggregate 6 described in the construction method 6 are successively put into a mixer for stirring. After ensuring that the aggregate is fully mixed into the cementitious material, the geopolymer artificial lightweight aggregate concrete 4 is prepared and can be poured in the next step;

[0147] 8. Pour the prepared geopolymer artificial lightweight aggregate concrete 4 into the wall reinforcement cage, pull out the joint pipe after pouring, and complete the production of the continuous wall structure after vibrating.

[0148] Example 6

[0149] This embodiment provides another specific application of a construction method of a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering. The difference between this embodiment and any one of the embodiments 1 to 5 is that the weight parts of raw materials used to prepare the industrial solid waste-based unburned artificial aggregate 6 are different, specifically:

[0150] This embodiment uses homemade concrete, which contains fly ash, slag, silica fume, alkali activator (, water reducing agent) and a certain amount of water.

[0151] The construction method of the underground continuous wall is as follows:

[0152] 1. Preparation before construction: clean up the construction site and conduct positioning inspection on the construction ground to ensure that underground pipelines and other obstacles in the construction area have been cleaned or properly handled. After completion, draw the axis of the underground continuous wall at the planned location;

[0153] 2. According to the construction drawings, guide walls are constructed on both sides of the underground continuous wall axis. The guide walls are made of C30 concrete and equipped with bidirectional steel bars. The depth of the guide walls is 1.5 to 2.5 meters, and the bottom is placed in the original soil layer;

[0154] 3. Use a rotary drilling machine to dig the groove section between the constructed guide walls to form a trench, and then clean the trench;

[0155] 4. According to the construction drawing, tie the longitudinal main reinforcement 2 and stirrups 3 into a reinforcement cage. The tying sequence should strictly follow the construction requirement of "main reinforcement first, then stirrups". After tying, weld them to the inner wall of the prefabricated H-shaped steel 1, and then hoist the entire reinforcement cage into place;

[0156] 5. Connect the joint pipe with other pipes or equipment used for underground continuous wall construction according to the design requirements, ensure that the interface is well sealed, and use a temporary support device to fix the joint pipe in the correct position to ensure its stability;

[0157] 6. Prepare the industrial solid waste-based, unburned artificial aggregate 6 according to the raw material requirements: weigh the raw materials by weight: 1069 parts of fly ash, 712 parts of slag, 54 parts of sodium hydroxide, 138 parts of sodium silicate, and 232 parts of water. The preparation method includes the following steps: evenly mix the weighed raw materials and put them into a disc granulator; turn on the disc granulator and control the speed of the disc granulator to 35r / min to mix the alkaline solution with the materials for granulation, increase the speed of the disc granulator to 60r / min, continue to spray clean water to assist in molding, stop spraying clean water when the sample molding effect is the best, and finally roll and granulate for two minutes to obtain the industrial solid waste-based, unburned artificial aggregate (please refer to the attached Fig.10 );

[0158] 7. According to the raw material requirements, the geopolymer artificial lightweight aggregate concrete 4 is prepared, fly ash, slag, silica fume and water are mixed in a weight ratio of 650-700:350-400:50-60:150-200, and stirred to obtain a cementitious material. The cementitious material and the industrial solid waste-based unburned artificial aggregate 6 described in the construction method 6 are successively put into a mixer for stirring. After ensuring that the aggregate is fully mixed into the cementitious material, the geopolymer artificial lightweight aggregate concrete 4 is prepared and can be poured in the next step;

[0159] 8. Pour the prepared geopolymer artificial lightweight aggregate concrete 4 into the wall reinforcement cage, pull out the joint pipe after pouring, and complete the production of the continuous wall structure after vibrating.

[0160] Comparative Examples 1 and 2 are both traditional C40 concrete, the cementitious material used is ordinary grade Portland cement, and the aggregate used is natural aggregate.

[0161] In summary, it can be seen from the result data recorded in Table 1 that the anti-permeability performance of the test piece of the present invention is significantly improved compared with ordinary Portland cement.

[0162] Penetration depth (mm) Porosity (%) Permeability coefficient (10-9m / s) Example 1 18.2 2.4 0.3 Example 2 17.9 2.1 0.4 Example 3 19.5 2.6 0.3 Example 4 18.7 2.2 0.4 Example 5 24.4 2.8 0.5 Example 6 23.5 2.6 0.4 Comparative Example 1 29.3 3.1 0.7 Comparative Example 2 30.2 3.2 0.7

[0163] Table 1

[0164] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can also be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering, characterized in that: The geopolymer artificial lightweight aggregate concrete impermeable continuous wall structure comprises a plurality of connected structural walls, wherein two adjacent structural walls are connected by H-shaped steel (1); The structural wall comprises: A main rib (2), wherein the main rib (2) is arranged vertically; a plurality of the main ribs (2) are provided, and the plurality of the main ribs (2) are arranged in a rectangular array; Stirrups (3), a plurality of stirrups (3) are provided; one stirrup (3) is at least wound around two adjacent main bars (2); the stirrups (3) and the main bars (2) form a bar cage; Geopolymer artificial lightweight aggregate concrete (4), the geopolymer artificial lightweight aggregate concrete (4) is poured in the reinforcement cage; Wherein, the main reinforcement (2) and stirrups (3) are both threaded steel bars.

2. The geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering according to claim 1, characterized in that: The aggregate used in the geopolymer artificial lightweight aggregate concrete (4) is industrial solid waste-based, unburned artificial aggregate (5); The industrial solid waste-based unburned artificial aggregate (5) is made of the following raw materials in parts by weight: 1000-1400 parts of fly ash, 500-750 parts of slag, 150-200 parts of alkali activator, and 150-300 parts of water.

3. The geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering according to claim 2, characterized in that: The cementitious material used in the geopolymer artificial lightweight aggregate concrete is made of fly ash, slag, silica fume and water; The mass ratio of fly ash: slag: silica ash: water is 650-700: 350-400: 50-60: 150-200.

4. The geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for foundation pit retaining engineering according to claim 1, characterized in that: The main reinforcement (2) and the stirrups (3) are tied together by steel bars; The main reinforcement (2) and / or the stirrup (3) are welded to the H-shaped steel (1).

5. A method for producing industrial solid waste-based unburned artificial aggregate, characterized in that: The industrial solid waste-based unburned artificial aggregate (5) is made of the following raw materials in parts by weight: 1000-1400 parts of fly ash, 500-750 parts of slag, 150-200 parts of alkali activator, and 150-300 parts of water; The method for preparing the industrial solid waste-based non-burning artificial aggregate comprises the following steps: S1, prepare an alkaline activator solution with a modulus range of 1.4-1.6, and cool for 2 hours; S2. Pour the fly ash and slag of the calculated mass into the disc granulator, tilt the ball disc 45°, and stir at a speed of 35r / min for 2min to make the fly ash and slag evenly mixed; S3, maintain the inclination angle and rotation speed of the ball disc, continue stirring, and spray the alkali activator solution therein until the solution mass reaches the designed ratio; S4. Increase the speed of the ball disc to 60r / min, spray water according to the shape of the aggregate to assist in shaping, so that the material adheres to the surface of the already formed core body, and the core body rolls as the ball disc rotates to form a large sphere; S5. Sprinkle dry fly ash into the ball tray, roll and granulate for 2 minutes to obtain industrial solid waste-based unburned artificial aggregate.

6. The method for producing industrial solid waste-based non-burning artificial aggregate according to claim 5, characterized in that: The alkali activator is prepared from sodium silicate, sodium hydroxide and water in a weight ratio of 100:800-900:150-200.

7. A construction method for a geopolymer artificial lightweight aggregate concrete anti-seepage continuous wall structure suitable for a foundation pit retaining project according to any one of claims 1 to 4, characterized in that: The construction method comprises the steps of: SS1. Preparation before construction: clean the construction site and conduct positioning inspection on the construction ground to ensure that underground pipelines and other obstacles in the construction area have been cleaned or properly handled. After completion, draw the axis of the underground continuous wall at the planned location; SS2. According to the construction drawings, guide walls are constructed on both sides of the underground continuous wall axis. The guide walls are made of C30 concrete and equipped with bidirectional steel bars. The depth of the guide walls is 1.5 to 2.5 m, and the bottom is placed in the original soil layer. SS3. Use a rotary drilling machine to dig the groove section between the constructed guide walls to form a trench, and then clean the trench; SS4. According to the construction drawing, the longitudinal main reinforcement (2) and stirrups (3) are tied to form a reinforcement cage. The tying sequence should strictly follow the construction requirement of "main reinforcement first, then stirrups". After tying, they are welded to the inner wall of the prefabricated H-shaped steel (1). After that, the entire reinforcement cage is hoisted into place. SS5. Connect the joint pipe with other pipes or equipment used for underground continuous wall construction according to design requirements, ensure that the interface is well sealed, and use temporary support devices to fix the joint pipe in the correct position to ensure its stability; SS6. Prepare geopolymer artificial lightweight aggregate concrete (4) according to the mix ratio and preparation process and pour it into the wall reinforcement cage. After pouring, pull out the joint pipe and vibrate to complete the production of the continuous wall structure.

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