Static bidirectional deep mixing pile drilling tool and construction method

Abstract

The invention discloses a static two-way deep mixing pile drilling tool and a construction method, and belongs to the technical field of cement mixing piles. The static two-way deep mixing pile drilling tool comprises a drilling tool main shaft which is of a hollow structure, and a slurry outlet hole is formed in the lower end of the drilling tool main shaft; the multiple static stirring assemblies are movably arranged on the drilling tool main shaft in a sleeving mode and arranged at intervals in the length direction of the drilling tool main shaft. The multiple dynamic stirring assemblies are fixedly connected to the drilling tool spindle and arranged at intervals in the length direction of the drilling tool spindle, and the multiple dynamic stirring assemblies and the multiple static stirring assemblies are alternately arranged. The dynamic stirring blades and the static frame are arranged, so that cement and soil are stirred more evenly, slurry does not flow back from a hole opening, and the pile forming quality is better guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of cement soil mixing piles, and in particular relates to a static bidirectional deep mixing pile drilling tool and a construction method. Background Art

[0002] Cement-soil mixing piles are an effective form of soft foundation treatment. Cement is used as the main curing agent. During construction, the drill rod drives the drill bit to rotate, stir and sink, and then spray and stir to lift it. The mixing is repeated to form a cement-soil pile body, which hardens the soft soil and improves the foundation strength.

[0003] At present, cement soil mixing piles are increasingly used in silt soft foundation treatment projects in coastal areas. However, during the construction process of existing cement pile mixing drills on soft foundations, there is a problem of uneven mixing of the soft foundation, serious slurry leakage, poor pile quality, and failure to meet engineering technical requirements. The commonly used drill tools include a drill rod and a mixing drill tool arranged at the bottom of the drill rod. However, in actual applications of this drill tool, the cement soil is only stirred horizontally and unidirectionally at the mixing drill tool at the bottom of the main shaft, and cannot be stirred synchronously in the reverse direction. The stirring method is single and the stirring is uneven. Summary of the invention

[0004] In order to solve the above problems, the present invention adopts the following technical solutions:

[0005] A static bidirectional deep mixing pile drilling tool, comprising:

[0006] A drilling tool main shaft, wherein the drilling tool main shaft is a hollow structure, and a slurry outlet hole is provided at the lower end of the drilling tool main shaft;

[0007] A plurality of groups of static stirring assemblies, each of which is movably sleeved on the main shaft of the drilling tool and arranged at intervals along the length direction of the main shaft of the drilling tool;

[0008] A plurality of groups of dynamic stirring components are fixedly connected to the main shaft of the drilling tool and are arranged at intervals along the length direction of the main shaft of the drilling tool. The plurality of groups of dynamic stirring components and the plurality of groups of static stirring components are arranged alternately.

[0009] Furthermore, each group of the static stirring components comprises:

[0010] Two static transverse stirring blades are arranged opposite to each other, and the first ends of the static transverse stirring blades are movably sleeved on the main shaft of the drilling tool.

[0011] Furthermore, the second ends of the plurality of static transverse stirring blades located on the same side are connected via a static vertical stirring blade to form a static frame, and both the static transverse stirring blade and the static vertical stirring blade have a certain width for blocking cement.

[0012] Furthermore, two adjacent groups of the dynamic stirring assemblies are staggeredly arranged along the circumference of the drilling tool main shaft.

[0013] Furthermore, each group of the dynamic stirring components includes two dynamic stirring blades, the two dynamic stirring blades are arranged opposite to each other, and the first ends of the dynamic stirring blades are fixedly connected to the drilling tool main shaft.

[0014] Furthermore, the dynamic stirring blades in the multiple groups of dynamic stirring components are all arranged at an angle.

[0015] Furthermore, the inclination directions of the dynamic stirring blades in two adjacent groups of the dynamic stirring assemblies are opposite.

[0016] Furthermore, the dynamic stirring blade located at the uppermost side is welded to the drill tool main shaft, and the remaining dynamic stirring blades are fixed to the drill tool main shaft via spline sleeves.

[0017] Furthermore, the top end of the drilling tool main shaft is connected to the drill rod, and the bottom end is connected to the horizontal drill bit.

[0018] A construction method for a static bidirectional deep mixing pile drilling tool, using any of the above-mentioned static bidirectional deep mixing pile drilling tools, the method comprising the following steps:

[0019] S10, spraying and stirring the lower layer;

[0020] Turn on the grouting pump, start the motor of the pile mixer, operate the transmission configuration of the pile mixer, make the drill rod of the pile mixer stir and sink along the guide frame, press cement slurry while moving and stirring, the upper flange of the drill tool main shaft is connected to the drill rod, and then drive the horizontal drill bit to drill down, cut the soil into the soft soil layer through the dynamic mixing blade, and then the static frame sinks into the soil body with the drill bit and keeps sinking in the vertical direction without rotation, the dynamic mixing blade disturbs the soil and mixes it to the static frame, so that the soil forms a reverse mixing structure in the static frame, so that the forward and reverse mixing soil are mixed;

[0021] S20, Shotcrete Mixing and Lifting

[0022] The mixing pile machine drills into the designed height of the pile bottom, and presses in cement slurry while stirring. During stirring and lifting, the dynamic stirring blades rotate and lift, and the static frame statically lifts along the soil body, so that the cement slurry and the soft soil layer are better mixed together after spraying and stirring;

[0023] S30, repeating step S10 and step S20 to achieve repeated stirring.

[0024] Beneficial effects:

[0025] The invention is easy to install and simple to operate, and construction work can be carried out after the upper flange is connected to the drill rod and the grouting pipeline is connected to the grouting equipment.

[0026] The invention is provided with dynamic mixing blades and a static frame so that the cement soil can be mixed more evenly and the hole opening does not have back-slurry, thereby better ensuring the quality of pile formation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0029] Among them, 1. Drilling tool main shaft; 2. Flange; 3. Dynamic stirring blade; 4. Static frame; 5. Slurry outlet hole; 6. Horizontal drill bit. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0035] Example 1

[0036] refer to Figure 1-Figure 2 , a static bidirectional deep mixing pile drilling tool, comprising:

[0037] A drilling tool main shaft 1, which is a hollow structure, and a slurry outlet hole 5 is provided at the lower end of the drilling tool main shaft 1;

[0038] A plurality of groups of static stirring components, each of which is movably mounted on the drilling tool main shaft 1 and arranged at intervals along the length direction of the drilling tool main shaft 1;

[0039] Multiple groups of dynamic stirring components are fixedly connected to the drill main shaft 1 and arranged at intervals along the length direction of the drill main shaft 1. The multiple groups of dynamic stirring components and the multiple groups of static stirring components are arranged alternately.

[0040] The drill bit of the present invention rotates and stirs the soil, and the dynamic stirring component breaks the soil and stirs the soil. During the drilling construction of the drill bit, the static stirring component enters the soil to form a non-rotating static frame to reversely stir the soil. This can better ensure that the drill bit forms a forward and reverse synchronous stirring effect in the process of stirring the soft soil layer, solving the technical problems of uneven soil stirring and a single stirring method of conventional drill bits.

[0041] The invention is provided with dynamic mixing blades and a static frame so that the cement soil can be mixed more evenly and the hole opening does not have back-slurry, thereby better ensuring the quality of pile formation.

[0042] In this embodiment, each set of static stirring components includes:

[0043] Two static transverse stirring blades are arranged opposite to each other, and the first ends of the static transverse stirring blades are movably sleeved on the drilling tool main shaft 1.

[0044] In this embodiment, the second ends of multiple static transverse stirring blades located on the same side are connected through a static vertical stirring blade to form a static frame 4. The static transverse stirring blade and the static vertical stirring blade both have a certain width for blocking soil.

[0045] In this embodiment, two adjacent groups of dynamic stirring assemblies are staggered along the circumference of the drilling tool main shaft 1 .

[0046] In this embodiment, two adjacent groups of dynamic stirring components are perpendicular to each other.

[0047] In this embodiment, each group of dynamic stirring components includes two dynamic stirring blades 3 , the two dynamic stirring blades 3 are arranged opposite to each other, and the first ends of the dynamic stirring blades 3 are fixedly connected to the drilling tool main shaft 1 .

[0048] In this embodiment, the dynamic stirring blades 3 in the multiple groups of dynamic stirring components are all arranged at an angle.

[0049] In this embodiment, the inclination directions of the dynamic stirring blades 3 in two adjacent groups of dynamic stirring assemblies are opposite.

[0050] Preferably, from top to bottom, there are the first group of dynamic stirring components, the second group of dynamic stirring components...the Nth group of dynamic stirring components, wherein the dynamic stirring blades 3 in the first group of dynamic stirring components form an inclination angle of 20° to 30° with the horizontal plane, the second group has the same inclination angle as the first group, and the inclination direction is opposite, and the third group has the same inclination angle as the first group, and the inclination direction is the same.

[0051] In this embodiment, the uppermost dynamic stirring blade 3 is welded to the drill tool body, and the remaining dynamic stirring blades 3 are fixed to the drill tool main shaft 1 via spline sleeves.

[0052] In this embodiment, the connections of various parts are sealed and fixed by wear-resistant materials.

[0053] In this embodiment, the top end of the drilling tool main shaft 1 is connected to the drill rod, and the bottom end is connected to the horizontal drill bit 6.

[0054] Example 2

[0055] This embodiment provides a construction method for a static bidirectional deep mixing pile drilling tool, using the static bidirectional deep mixing pile drilling tool in Embodiment 1, and the method comprises the following steps:

[0056] S10, spraying and stirring the lower layer;

[0057] The grouting pump is turned on, the motor of the pile mixer is started, and the transmission configuration of the pile mixer is operated, so that the drill rod of the pile mixer is stirred and sunk along the guide frame, and the cement slurry is pressed into the machine while stirring. The upper flange 2 of the drill tool main shaft 1 is connected to the drill rod, and then the horizontal drill bit 6 is driven to drill down, and the soil is cut into the soft soil layer through the dynamic mixing blade 3. Then, the static frame 4 sinks into the soil body with the drill bit and keeps sinking in the vertical direction without rotating. The dynamic mixing blade 3 disturbs the soil and mixes it toward the static frame 4, so that the soil forms a reverse stirring structure in the static frame 4, thereby mixing the forward and reverse soil bodies of the stirred soil body;

[0058] S20, Shotcrete Mixing and Lifting

[0059] The mixing pile machine drills into the designed height of the pile bottom, and presses cement slurry into the pile while stirring. During stirring and lifting, the dynamic stirring blade 3 rotates and lifts, and the static frame 4 statically lifts along the soil body, so that the cement slurry and the soft soil layer are better mixed together after spraying and stirring.

[0060] S30, repeating step S10 and step S20 to achieve repeated stirring.

[0061] The invention is easy to install and simple to operate, and construction work can be carried out after the upper flange is connected to the drill rod and the grouting pipeline is connected to the grouting equipment.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A static bidirectional deep mixing pile drilling tool, characterized in that: include: A drilling tool main shaft, wherein the drilling tool main shaft is a hollow structure, and a slurry outlet hole is provided at the lower end of the drilling tool main shaft; A plurality of groups of static stirring assemblies, each of which is movably sleeved on the main shaft of the drilling tool and arranged at intervals along the length direction of the main shaft of the drilling tool; A plurality of groups of dynamic stirring components are fixedly connected to the main shaft of the drilling tool and are arranged at intervals along the length direction of the main shaft of the drilling tool. The plurality of groups of dynamic stirring components and the plurality of groups of static stirring components are arranged alternately.

2. The static bidirectional deep mixing pile drilling tool according to claim 1, characterized in that: Each set of the static stirring components comprises: Two static transverse stirring blades are arranged opposite to each other, and the first ends of the static transverse stirring blades are movably sleeved on the main shaft of the drilling tool.

3. The static bidirectional deep mixing pile drilling tool according to claim 2, characterized in that: The second ends of the plurality of static transverse stirring blades located on the same side are connected through a static vertical stirring blade to form a static frame. Both the static transverse stirring blade and the static vertical stirring blade have a certain width for blocking cement.

4. The static bidirectional deep mixing pile drilling tool according to claim 1, characterized in that: Two adjacent groups of the dynamic stirring components are staggeredly arranged along the circumference of the drilling tool main shaft.

5. The static bidirectional deep mixing pile drilling tool according to claim 4, characterized in that: Each group of the dynamic stirring components includes two dynamic stirring blades, the two dynamic stirring blades are arranged opposite to each other, and the first ends of the dynamic stirring blades are fixedly connected to the main shaft of the drilling tool.

6. The static bidirectional deep mixing pile drilling tool according to claim 5, characterized in that: The dynamic stirring blades in the multiple groups of dynamic stirring components are all arranged at an angle.

7. The static bidirectional deep mixing pile drilling tool according to claim 6, characterized in that: The inclination directions of the dynamic stirring blades in two adjacent groups of the dynamic stirring components are opposite.

8. The static bidirectional deep mixing pile drilling tool according to claim 5, characterized in that: The dynamic stirring blade located at the uppermost side is welded to the drill tool main shaft, and the remaining dynamic stirring blades are fixed to the drill tool main shaft through spline sleeves.

9. The static bidirectional deep mixing pile drilling tool according to claim 1, characterized in that: The top end of the drilling tool main shaft is connected to the drill rod, and the bottom end is connected to the horizontal drill bit.

10. A construction method for a static bidirectional deep mixing pile drilling tool, characterized in that: Using the static bidirectional deep mixing pile drilling tool according to any one of claims 1 to 9, the method comprises the following steps: S10, spraying and stirring the lower layer; Turn on the grouting pump, start the motor of the pile mixer, operate the transmission configuration of the pile mixer, make the drill rod of the pile mixer stir and sink along the guide frame, press cement slurry while moving and stirring, the upper flange of the drill tool main shaft is connected to the drill rod, and then drive the horizontal drill bit to drill down, cut the soil into the soft soil layer through the dynamic mixing blade, and then the static frame sinks into the soil body with the drill bit and keeps sinking in the vertical direction without rotation, the dynamic mixing blade disturbs the soil and mixes it to the static frame, so that the soil forms a reverse mixing structure in the static frame, so that the forward and reverse mixing soil are mixed; S20, Shotcrete Mixing and Lifting The mixing pile machine drills into the designed height of the pile bottom, and presses in cement slurry while stirring. During stirring and lifting, the dynamic stirring blades rotate and lift, and the static frame statically lifts along the soil body, so that the cement slurry and the soft soil layer are better mixed together after spraying and stirring; S30, repeating step S10 and step S20 to achieve repeated stirring.

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