Miniature pile construction device under complicated island geological conditions

Abstract

The utility model relates to the technical field of building construction, in particular to a miniature pile construction device under complex island geological conditions, a miniature pile assembly is arranged in a throwing and filling stone, and the lower end of the miniature pile assembly penetrates through the throwing and filling stone and is located in a moderately and slightly weathered rock; the distance between the bottom end of the micro pile assembly and the lower end of the throwing and filling stone is not smaller than 0.8 m, and meanwhile the micro pile assembly is filled with slurry mixed liquid. The expandable triangular plug is connected with the inner wall of a hole in an inserted mode, so that the outer sleeve is connected with the interior of the pile hole more stably, meanwhile, the steel pipe is filled with slurry mixed liquid, and therefore the defects that the setting time of single-liquid cement slurry is long and difficult to control, and the stone rate is low under the flowing water condition can be overcome; the effect of cement coagulation pile forming is improved, the cement grouting range is expanded, meanwhile, all-sleeve construction is adopted, the grout leakage phenomenon and construction difficulty are reduced, cost is reduced, and the construction speed is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a micro pile construction device under complex island geological conditions. Background Art

[0002] In complex island areas, most of the underground areas are in geological conditions with high porosity, high seawater level, serious hole collapse and string hole, and low stone rate under dynamic water conditions. Common micro steel pipe piles generally use mud wall protection to directly grout into the pile hole, but this method will cause problems such as hole collapse, long-term infilling, and grout leakage in complex island environments. Utility Model Content

[0003] The purpose of the utility model is to provide a micro pile construction device under complex island geological conditions to solve the problems raised in the above background technology.

[0004] The technical solution of the utility model is: a micropile construction device under complex island geological conditions, including a sea level, a dumping stone is arranged on one side of the sea level, the lower end of the dumping stone is arranged with medium and slightly weathered rock, a micropile assembly is arranged inside the dumping stone, the lower end of the micropile assembly passes through the dumping stone and is located inside the medium and slightly weathered rock, and the distance between the bottom end of the micropile assembly and the lower end of the dumping stone is not less than 0.8m, and the interior of the micropile assembly is filled with a mud mixture.

[0005] Furthermore, the mud mixture includes cement slurry, water glass stock solution and admixtures, and the water-cement ratio in the cement slurry is less than 0.5, and the Baume degree of the water glass stock solution is set to 38-41.

[0006] Furthermore, the micropile assembly includes a steel pipe, a movable shell and an outer sleeve, the steel pipe is arranged inside the outer sleeve, the outer sleeve is arranged inside the movable shell, and a plurality of expandable triangular plugs are arranged on the outside of the outer sleeve, each of which is arranged inside the movable shell.

[0007] Furthermore, two adjacent micro-pile assemblies are welded and fixed by threads, and the threads are arranged at the ends of the movable shell.

[0008] Furthermore, the expandable triangular plug includes a fixed rod and a telescopic rod, the fixed rod is arranged at the upper end of the telescopic rod, and one end of the fixed rod and one end of the telescopic rod are fixedly connected to the side of the outer sleeve through an adapter, and the other end of the fixed rod is fixedly connected to the other end of the telescopic rod.

[0009] Furthermore, an active cavity is arranged on the side of the outer sleeve, a pull rope is arranged inside the active cavity, and the pull rope and the expandable triangular plug are connected through a middle elastic rod.

[0010] Furthermore, a filling cavity is provided between the lower end of the movable shell and the bottom of the pile hole, and the thickness of the filling cavity is less than 50 mm.

[0011] The utility model provides a micro pile construction device under complex island geological conditions through improvement, which has the following improvements and advantages compared with the prior art:

[0012] The micro-pile construction device of the utility model is inserted and connected with the inner wall of the hole through an expandable triangular plug, so that the connection between the outer sleeve and the inside of the pile hole is more stable, and at the same time, a mud mixture is filled in the interior of the steel pipe, and the mud mixture is composed of a mixture of cement slurry, water glass stock solution and an admixture, thereby not only overcoming the shortcomings of single-liquid cement slurry, such as a long coagulation time and difficulty in control, and a low stone rate under dynamic water conditions, but also improving the effect of cement coagulation into piles and expanding the scope of cement grouting. At the same time, full-casing construction is adopted, which reduces leakage and construction difficulty, reduces costs and speeds up construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further explained below in conjunction with the accompanying drawings and embodiments:

[0014] Figure 1 It is a schematic diagram of the installation structure of the micro pile construction device of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the micro pile construction device of the utility model;

[0016] Figure 3 This is a schematic diagram of the installation structure of the expandable triangular plug of the utility model;

[0017] Description of reference numerals:

[0018] 1. Moderately slightly weathered rock; 2. Micro pile assembly; 3. Dump stone; 4. Sea level; 5. Steel pipe; 6. Thread; 7. Expandable triangular plug; 8. Movable shell; 9. Outer sleeve; 10. Movable cavity; 11. Pull rope; 12. Fixed rod; 13. Middle elastic rod; 14. Telescopic rod; 15. Adapter. DETAILED DESCRIPTION

[0019] 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 part of the embodiments of the present invention, not all of the 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.

[0020] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships 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, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0022] It should be noted that like reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined or described in one drawing, it will not require further detailed discussion and description in the description of the subsequent drawings.

[0023] refer to Figure 1-Figure 3 , this embodiment provides a micropile construction device under complex island geological conditions, and the micropile construction device is arranged on the side of the sea level 4. Specifically, a dumping stone 3 is arranged on one side of the sea level 4, and a medium-slightly weathered rock 1 is arranged at the lower end of the dumping stone 3. Further, a micropile assembly 2 is arranged inside the dumping stone 3, and the lower end of the micropile assembly 2 penetrates the dumping stone 3 and is located inside the medium-slightly weathered rock 1. It is worth noting that the distance between the bottom end of the micropile assembly 2 and the lower end of the dumping stone 3 is not less than 0.8m, that is, the length of the micropile assembly 2 located inside the medium-slightly weathered rock 1 is not less than 0.8m. At the same time, a mud mixture is filled inside the micropile assembly 2. In this embodiment, the mud mixture includes cement slurry, water glass stock solution and admixture, wherein the water-cement ratio in the cement slurry is less than 0.5, and the Baume degree of the water glass stock solution is set to 38-41. In other words, by mixing 38-41 degrees Baume water glass concentrate and an appropriate amount of admixtures into the cement slurry, not only the shortcomings of single-liquid cement slurry such as long and difficult to control setting time and low stone setting rate under dynamic water conditions are overcome, but also the effect of cement setting into piles is improved and the scope of cement grouting is expanded.

[0024] In the present embodiment, the micro pile assembly 2 includes a steel pipe 5, a movable shell 8 and an outer sleeve 9. The steel pipe 5 is arranged inside the outer sleeve 9, and the outer sleeve 9 is arranged inside the movable shell 8. At the same time, a plurality of expandable triangular plugs 7 are arranged on the outside of the outer sleeve 9, and each expandable triangular plug 7 is arranged inside the movable shell 8. Specifically, during the use of the micro pile assembly 2, it is drilled together with the down-the-hole hammer, and at the same time, two adjacent micro pile assemblies 2 are welded and fixed by threads 6. That is to say, the threads 6 are arranged at the end of the movable shell 8. At the same time, the hole diameter of the micro pile assembly 2 is 200mm, and the length of the lower end of the micro pile assembly 2 entering the inside of the slightly weathered rock 1 is not less than 0.8m. It is worth noting that the rock embedding depth is calculated based on the lower rock surface around the pile. At the same time, a filling cavity is arranged between the lower end of the movable shell 8 and the bottom of the pile hole, and the thickness of the filling cavity is less than 50mm.

[0025] Further, an active cavity 10 is provided on the side of the outer sleeve 9, wherein a pull rope 11 is provided inside the active cavity 10, and the pull rope 11 and the expandable triangular plug 7 can be connected through a middle elastic rod 13. Specifically, the expandable triangular plug 7 includes a fixed rod 12 and a telescopic rod 14. The fixed rod 12 is provided at the upper end of the telescopic rod 14, and one end of the fixed rod 12 and one end of the telescopic rod 14 are fixedly connected to the side of the outer sleeve 9 through an adapter 15, and the other end of the fixed rod 12 and the other end of the telescopic rod 14 are fixedly connected.

[0026] Specifically, the construction process of the micropile construction device under complex island geological conditions in this embodiment is as follows:

[0027] The first step is to drill the micropile assembly 2 together with the down-the-hole hammer. The two adjacent micropile assemblies 2 are fixed by welding with threads 6 at the intersecting ports, and the hole diameter is 200mm. At the same time, the length of the pile bottom entering the slightly weathered rock 1 is not less than 0.8m. It is worth noting that during construction, attention should be paid to controlling the inclination angle to ensure verticality. At the same time, during the drilling process, it is necessary to pay attention to the changes in the soil layer and compare with the geological survey report at any time to reasonably adjust the drilling parameters such as the drilling speed and drilling pressure. The parameter adjustment is not fixed, and it is specifically adjusted according to the actual construction situation. Therefore, in this embodiment, it will not be specifically described.

[0028] Step 2: Fine sand and gravel in the hole-making process are discharged out of the hole with the airflow during the drilling process. At the same time, the hole needs to be cleaned every time the depth reaches the length of a drill rod or the depth required by the design. At the same time, before injecting cement slurry, the pile hole needs to be cleaned so that all the mud in the hole is discharged. At the same time, the thickness of the sediment at the bottom of the hole is required to be no more than 50mm.

[0029] Step 3: The steel pipe 5 is connected by thread 6, and the two sides are welded. The welding should be full and stable. At the same time, the connection of the steel pipe 5 should be straight and not bent. It is worth noting that the finished steel pipe 5 is sunk into the drilled hole by a car crane, and the grouting pipe is sunk into the hole along with the installation of the steel pipe 5.

[0030] Step 4: After the steel pipe 5 is sunk into the hole, the movable shell 8 is pulled out by a crane, and then the pull rope 11 is locked, so that the middle elastic rod 13 supports and fixes the end of the connection between the fixed rod 12 and the telescopic rod 14, so that the expandable triangular plug 7 can be inserted into the soil layer around the hole.

[0031] Step 5: Fill the interior of the steel pipe 5 with fine stones. After filling, grouting is carried out in time, wherein the grouting pipe is directly inserted into the steel pipe 5 in the entry hole by the grouting machine, and the interface is connected with a thread 6, and the grouting pipe is transported with a rubber tube.

[0032] Step 6: Grouting is performed inside the filled steel pipe 5, wherein the grouting pressure is 0.3MPa, and the grouting in the pile hole is performed with a mud mixture. Specifically, a grouting pipe is placed inside the steel pipe 5, and open grouting is performed first down to the bottom of the hole. After pure slurry emerges from the orifice, the grouting pipe is lifted to the vicinity of the orifice for orifice closed pressure grouting. At the same time, when pure slurry emerges from the outer side of the pipe wall, the grouting can be stopped. After the slurry is initially precipitated, the inside and outside of the pipe wall are promptly grouted, and the pile hole is completely filled. During the grouting process, the outer sleeve 9 is not pulled out, and about 30 minutes after the grouting is completed, the outer sleeve 9 is pulled out after the slurry is about to reach initial setting, and then the inside and outside of the pipe wall are grouted.

[0033] 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 micropile construction device under complex island geological conditions, comprising a sea level (4), a dumping rock (3) is arranged on one side of the sea level (4), and a medium-slightly weathered rock (1) is arranged at the lower end of the dumping rock (3), characterized in that: A micropile assembly (2) is arranged inside the throw-in stone (3), the lower end of the micropile assembly (2) penetrates the throw-in stone (3) and is located inside the medium-slightly weathered rock (1), and the distance between the bottom end of the micropile assembly (2) and the lower end of the throw-in stone (3) is not less than 0.8 m, and the interior of the micropile assembly (2) is filled with a mud mixture.

2. A micropile construction device under complex island geological conditions according to claim 1, characterized in that: The mud mixture comprises cement slurry, water glass stock solution and additives.

3. The micropile construction device under complex island geological conditions according to claim 1 is characterized in that: The micro pile assembly (2) comprises a steel pipe (5), a movable shell (8) and an outer sleeve (9), wherein the steel pipe (5) is arranged inside the outer sleeve (9), and the outer sleeve (9) is arranged inside the movable shell (8). Meanwhile, a plurality of expandable triangular plugs (7) are arranged on the outside of the outer sleeve (9), and each of the expandable triangular plugs (7) is arranged inside the movable shell (8).

4. A micropile construction device under complex island geological conditions according to claim 3, characterized in that: Two adjacent micro-pile assemblies (2) are welded and fixed via threads (6), and the threads (6) are arranged at the end of the movable shell (8).

5. The micropile construction device under complex island geological conditions according to claim 3 is characterized in that: The expandable triangular plug (7) comprises a fixed rod (12) and a telescopic rod (14), wherein the fixed rod (12) is arranged at the upper end of the telescopic rod (14), and one end of the fixed rod (12) and one end of the telescopic rod (14) are fixedly connected to the side of the outer sleeve (9) through an adapter (15), and the other end of the fixed rod (12) and the other end of the telescopic rod (14) are fixedly connected.

6. A micropile construction device under complex island geological conditions according to claim 3 or 5, characterized in that: An active cavity (10) is arranged on the side of the outer sleeve (9), a pull rope (11) is arranged inside the active cavity (10), and the pull rope (11) and the expandable triangular plug (7) are connected via a middle elastic rod (13).

7. The micropile construction device under complex island geological conditions according to claim 3 is characterized in that: A filling cavity is provided between the lower end of the movable shell (8) and the bottom of the pile hole, and the thickness of the filling cavity is less than 50 mm.

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