Geopolymer grouting reinforcement composite pile

Abstract

The utility model discloses a geopolymer grouting reinforcement composite pile which is arranged in a construction ground in a penetrating mode, the bottom end of the geopolymer grouting reinforcement composite pile extends into a gravel stratum, and the geopolymer grouting reinforcement composite pile comprises a reinforced cement-geopolymer concrete cast-in-place pile body, a high-pressure grouting pipe located at the bottom end of the reinforced cement-geopolymer concrete cast-in-place pile body and a geopolymer grouting reinforcement carrier located in the gravel stratum. The high-pressure grouting pipe extends into the gravel stratum, and the geopolymer grouting reinforcement carrier is injected into the gravel stratum through the high-pressure grouting pipe in a high-pressure grouting mode to be formed. The utility model has the beneficial effects that the technology can effectively improve the bearing capacity of the pile foundation, has early strength, quick hardening, good durability and high strength, can reduce the construction cost while improving the construction efficiency, realizes the recycling of solid wastes, and can effectively avoid the vibration and noise influence caused by the construction methods of tamping, vibration and the like adopted by the traditional carrier pile.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction and highway engineering, and particularly relates to a geopolymer grouting reinforcement composite pile. Background Art

[0002] The traditional carrier pile forms an artificial bearing stratum by means of filling and ramming at the bottom of the pile, vibration compaction, etc., so that the load of the upper structure is transmitted to a better bearing stratum through the pile body and the artificial bearing stratum at the bottom of the pile, thereby improving the bearing capacity of the pile foundation. However, for gravel strata, the effect of forming an artificial bearing stratum by means of dynamic compaction or vibration is not ideal, and for municipal projects, construction is often carried out in residential areas, and dynamic compaction or vibration will have an adverse impact on surrounding buildings and other facilities.

[0003] Cement is the most commonly used cementitious material for the preparation of concrete and grouting materials. Although cement can produce good cementitious effects, its durability is poor. Especially under the erosion of sulfate or chloride salts, the physical and mechanical properties of the cast concrete or grouting solidified body will deteriorate seriously. At the same time, cement has the disadvantages of high energy consumption, high pollution and high CO2 emissions.

[0004] Based on this, it is necessary to provide a geopolymer grouting reinforcement composite pile to solve the above technical problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a geopolymer grouting reinforcement composite pile, aiming to solve at least one technical deficiency involved in the background art.

[0006] The technical solution for realizing the purpose of the utility model is a geopolymer grouting reinforcement composite pile, which is inserted into the construction ground and the bottom end extends into the gravel stratum, and includes a reinforced cement-geopolymer concrete pile body, a high-pressure grouting pipe at the bottom end of the reinforced cement-geopolymer concrete pile body, and a geopolymer grouting reinforcement carrier in the gravel stratum;

[0007] The high-pressure grouting pipe extends into the gravel stratum, and the geopolymer grouting reinforcement carrier is formed by injecting into the gravel stratum in the form of high-pressure grouting through the high-pressure grouting pipe.

[0008] Further preferably: the geopolymer in the reinforced cement-geopolymer concrete pile body and the geopolymer grouting reinforcement carrier is formed by uniformly mixing steel slag, slag, fly ash, alkali activator and water.

[0009] Further preferably: a plurality of grouting holes communicated with the bottom of the high-pressure grouting pipe are arranged in the gravel stratum;

[0010] The geopolymer in the high-pressure grouting pipe is injected into the gravel stratum through the grouting holes and forms a geopolymer grouting reinforcement carrier.

[0011] Further preferably, the length of the grouting hole is 3 - 6 m, and the diameter is 4 - 6 cm.

[0012] Further preferably, the number of the grouting holes is 3 - 5, and the outer grouting holes can be inclined outward by 3 - 5°.

[0013] Further preferably, the pressure of high-pressure grouting in the grouting hole is 3 MPa - 30 MPa.

[0014] Further preferably, the pile body of the reinforced cement-geopolymer concrete is formed by concrete pouring with a composite cementitious material made of cement and geopolymer, and the mass of cement and geopolymer is the same.

[0015] Further preferably, the length of the pile body of the reinforced cement-geopolymer concrete is 5 - 15 m, and the diameter is 30 - 80 cm.

[0016] Further preferably, the pile body of the reinforced cement-geopolymer concrete is arranged in a plum blossom pile shape or a rectangular shape in the construction ground.

[0017] The utility model has positive effects: 1. Convenient process and high pile foundation bearing capacity: By grouting in the gravel layer at the bottom of the pile foundation to form a geopolymer grouting reinforcement carrier, the bearing capacity of the foundation can be greatly improved, and the problem of unsatisfactory compaction effect of gravel soil in the construction process of traditional carrier piles can be effectively overcome. At the same time, the vibration and noise generated by traditional ramming and extrusion vibration and other construction processes can be overcome, and it can be widely applied to the project construction of buildings and municipal roads located in gravel layer foundations.

[0018] 2. Fast setting speed and good durability: The geopolymer used for grouting has the advantages of high fluidity, fast hardening and early strength, and fast setting speed; in the process of high-pressure grouting construction, the geopolymer slurry is pressed into the gravel layer to quickly solidify and form a geopolymer grouting reinforcement carrier, which can greatly improve the bearing capacity of the gravel layer. At the same time, the geopolymer has excellent resistance to sulfate or chloride salt erosion and good durability, which is beneficial to improving construction efficiency, reducing costs, and realizing the recycling of solid waste.

[0019] 3. Low-carbon energy-saving and green environmental protection: Geopolymer is an inorganic cementitious material made from industrial solid waste through alkali activation reaction, and the production and use process is non-toxic and pollution-free. At the same time, 50% of the geopolymer is incorporated into the reinforced cement-geopolymer concrete pile to replace cement as the cementitious material, which can greatly reduce the amount of cement used. Description of the Drawings

[0020] In order to make the content of the utility model easier to be clearly understood, the following further detailed description of the utility model is made according to specific embodiments in combination with the drawings, where:

[0021] Figure 1 is the schematic cross-sectional structure diagram of a single pile of the present utility model;

[0022] Figure 2 is the schematic diagram of the geopolymer grouting reinforcement carrier of the present utility model;

[0023] Figure 3 is the schematic diagram of the separate structure of the high-pressure grouting holes in the present utility model;

[0024] Figure 4 is the schematic diagram of the multi-pile structure of the present utility model;

[0025] Figure 5 is the schematic diagram of the plum blossom arrangement structure of the pile foundation in the present utility model;

[0026] Figure 6 is the schematic diagram of the rectangular arrangement structure of the pile foundation of the present utility model.

[0027] Reference numerals: construction ground 1, reinforced cement-geopolymer concrete pile body 2, high-pressure grouting pipe 3, grouting hole 31, geopolymer grouting reinforcement carrier 4, gravel layer 5. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0029] Embodiment

[0030] As shown in Figures 1 to 6 , a geopolymer grouting reinforced composite pile is inserted into the construction ground 1 and its bottom end extends into the gravel formation 5, and includes a reinforced cement-geopolymer concrete pile body 2, a high-pressure grouting pipe 3 at the bottom end of the reinforced cement-geopolymer concrete pile body 2, and a geopolymer grouting reinforcement carrier 4 in the gravel formation 5; the high-pressure grouting pipe 3 extends into the gravel formation 5, and the geopolymer grouting reinforcement carrier 4 is formed by being injected into the gravel formation 5 in a high-pressure grouting manner through the high-pressure grouting pipe 3. The length of its reinforced cement-geopolymer concrete pile body 2 is greater than the height of the construction ground. In actual application, the length of its reinforced cement-geopolymer concrete pile body 2 is 5 to 15 m, and the diameter is 30 to 80 cm. In this embodiment, the length of its reinforced cement-geopolymer concrete pile body 2 is 11 m, and the diameter is 60 cm.

[0031] And the reinforced cement-geopolymer concrete pile shaft 2 is arranged in the construction ground 1 in a plum blossom pile shape or a rectangular shape. Its high-pressure grouting pipe is mainly used to inject geopolymer into the gravel stratum, so as to ensure the stability and reliability of the support.

[0032] The geopolymer in the reinforced cement-geopolymer concrete pile shaft 2 and the geopolymer grouting reinforcement carrier 4 is formed by uniformly mixing steel slag, slag, fly ash, alkali activator and water. In this embodiment, the steel slag, slag, etc. can be replaced by other industrial wastes. And, in the actual application process, a plurality of grouting holes 31 communicated with the bottom of the high-pressure grouting pipe 3 are arranged in the gravel stratum 5; the geopolymer in the high-pressure grouting pipe 3 is injected into the gravel stratum 5 through the grouting holes 31 to form the geopolymer grouting reinforcement carrier 4. The length of the grouting hole 31 is 3-6M, and the diameter is 4-6CM. In this embodiment, the length of the grouting hole 31 is 5M, and the diameter is 4CM.

[0033] The number of the grouting holes 31 is 3-5, and the outer grouting holes 31 can be inclined outward by 3-5°. In this embodiment, the outer grouting holes 31 can be inclined outward by 3°, and the pressure of high-pressure grouting in the grouting holes 31 is 3MPa-30MPa. Specifically, in the actual application process, 12MPa is the best. Through the above structure, the grouting molding of the geopolymer grouting reinforcement carrier 4 can be effectively realized, and the connection stability and reliability with the gravel stratum can be ensured. The grouting holes can be inclined outward by 3-5°, so as to ensure the force stability and use firmness with the gravel stratum after casting.

[0034] In the actual application process, the reinforced cement-geopolymer concrete pile shaft 2 is formed by concrete casting of a composite cementitious material made of cement and geopolymer, and the mass of cement and geopolymer is the same. Among them, the mass of both cement and geopolymer accounts for 50%. Thereby, the overall quality of the casting can be ensured, and the use stability and reliability can be improved.

[0035] This embodiment has positive effects: 1. Convenient process and high pile foundation bearing capacity: By grouting in the gravel layer at the bottom of the pile foundation to form a geopolymer grouting reinforcement carrier, the bearing capacity of the foundation can be greatly improved, and the problem of unsatisfactory compaction effect of gravel soil in the construction process of traditional carrier piles can be effectively overcome. At the same time, the vibration and noise generated by traditional ramming and squeezing vibration and other construction processes can be overcome, and it can be widely applied to the project construction of buildings and municipal roads located in gravel layer foundations.

[0036] 2. Fast setting speed and good durability: The geopolymer for grouting has the advantages of rapid hardening, early strength, and fast setting speed while ensuring high fluidity. During the high-pressure grouting construction process, the geopolymer slurry is injected into the gravel layer to quickly solidify and form a geopolymer grouting reinforcement carrier, which can significantly improve the bearing capacity of the gravel layer. At the same time, the geopolymer has excellent resistance to sulfate or chloride salt erosion and good durability, which is conducive to improving construction efficiency, reducing costs, and realizing the recycling of solid waste.

[0037] 3. Low-carbon, energy-saving, green and environmental protection: Geopolymer is an inorganic cementitious material made from industrial solid waste through alkali activation reaction, and the production and use processes are non-toxic and pollution-free. At the same time, 50% of the geopolymer is incorporated into the reinforced concrete pile with steel bars and geopolymer to replace cement as the cementitious material, which can significantly reduce the amount of cement used.

[0038] The standard parts used in this embodiment can be directly purchased from the market, and the non-standard structural components described in the specification can also be processed without doubt directly according to the existing common technical knowledge. At the same time, the connection methods of each component adopt the mature conventional means in the existing technology, and the machines, parts, and equipment all adopt the conventional models in the existing technology, so no specific description will be made here.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And these obvious changes or modifications derived from the essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A geopolymer grouting reinforced composite pile is inserted into the construction ground (1) and its bottom end extends into the gravel stratum (5), and is characterized in that: It includes a reinforced cement-geopolymer concrete pile body (2), a high-pressure grouting pipe (3) at the bottom end of the reinforced cement-geopolymer concrete pile body (2), and a geopolymer grouting reinforcement carrier (4) in the gravel stratum (5); The high-pressure grouting pipe (3) extends into the gravel stratum (5), and the geopolymer grouting reinforcement carrier (4) is formed by being injected into the gravel stratum (5) in a high-pressure grouting manner through the high-pressure grouting pipe (3).

2. The geopolymer grouting reinforced composite pile according to claim 1, wherein: The geopolymer in the reinforced cement-geopolymer concrete pile body (2) and the geopolymer grouting reinforcement carrier (4) is formed by uniformly mixing steel slag, slag, fly ash, an alkali activator, and water.

3. The geopolymer grouting reinforced composite pile according to claim 1, characterized in that: A number of grouting holes (31) communicating with the bottom of the high-pressure grouting pipe (3) are arranged in the gravel stratum (5); The geopolymer in the high-pressure grouting pipe (3) is injected into the gravel stratum (5) through the grouting holes (31) to form the geopolymer grouting reinforcement carrier (4).

4. The geopolymer grouting reinforced composite pile according to claim 3, wherein: The length of the grouting hole (31) is 3 - 6M, and the diameter is 4 - 6CM.

5. The geopolymer grouting reinforced composite pile according to claim 3, wherein: The number of the grouting holes (31) is 3 - 5, and the outer grouting holes (31) can be inclined outward by 3 - 5°.

6. The geopolymer grouting reinforced composite pile according to claim 3, characterized in that: The pressure of high-pressure grouting in the grouting hole (31) is 3MPa - 30MPa.

7. A geopolymer grouting reinforced composite pile according to claim 1, characterized in that: The reinforced cement-geopolymer concrete pile body (2) is formed by concrete pouring with a composite cementitious material made of cement and geopolymer, and the mass of cement and geopolymer is the same.

8. The geopolymer grouting reinforced composite pile according to claim 1, wherein: The length of the reinforced cement-geopolymer concrete pile body (2) is 5 - 15m, and the diameter is 30 - 80cm.

9. The geopolymer grouting reinforced composite pile according to claim 1, wherein: The reinforced cement-geopolymer concrete pile body (2) is arranged in the construction ground (1) in a plum blossom pile shape or a rectangular shape.

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