Longitudinal rotary telescopic blade of bidirectional cement-soil mixing pile

Abstract

The utility model relates to a longitudinal rotary telescopic blade of a cement-soil two-way mixing pile, which comprises an outer drill rod and an inner drill rod which are vertically arranged, the outer drill rod is hollow, two ends of the outer drill rod are open, the inner drill rod is hollow, the top of the inner drill rod is open, the bottom of the inner drill rod is closed, and the inner drill rod is sleeved in the outer drill rod at intervals. The two spiral blade sets are fixed to the outer side wall of the lower portion of the outer drill rod and the outer side wall of the lower portion of the inner drill rod through shaft sleeves correspondingly. Each spiral blade group comprises two blade group units which are symmetrically arranged, each single blade group unit comprises a rotating mechanism and a telescopic blade mechanism, the rotating mechanism is mounted on the side wall of the shaft sleeve and can drive the telescopic blade mechanism to rotate, and the telescopic length of the telescopic blade mechanism is adjustable. The mixing device has the beneficial effects of improving the mixing uniformity, the reinforcing effect, the operation flexibility and the like.

Description

Technical Field

[0001] The utility model relates to a rotary telescopic blade, in particular to a longitudinal rotary telescopic blade of a cement-soil bidirectional mixing pile, belonging to the technical field of mixing piles. Background Art

[0002] The cement soil mixing method is a method for reinforcing saturated clay foundations. It uses cement or lime as a curing agent, and uses a special mixing machine to forcefully mix the soft soil and curing agent (slurry or powder) deep in the foundation. Through a series of physical and chemical reactions between the curing agent and the foundation soil, the foundation soil is hardened into cement soil with integrity, water stability and a certain strength, thereby improving the foundation strength and increasing the deformation modulus. At present, in the field of soil improvement and foundation engineering, cement soil bidirectional mixing piles are widely used in the reinforcement of soft soil foundations and infrastructure construction.

[0003] These mixing pile systems usually use a horizontally rotating blade to mix soft soil (or mixed soil) and curing agent (slurry or powder) around the pile body. However, for certain soil types and specific engineering requirements, the existing technology may have certain limitations in mixing uniformity and depth treatment. Although the traditional two-way mixing pile system can achieve mixing of soil and curing agent in the horizontal direction, it still has shortcomings in mixing uniformity and depth treatment in the vertical direction. For soft soil and soil with high water content, the traditional horizontal rotation method may not fully achieve comprehensive mixing, resulting in unsatisfactory reinforcement effect or uneven mixing.

[0004] In addition, in the foundation pit support design, the heterogeneity of soil layers and the difference in lateral pressure loads are important factors that need to be carefully considered. Soil layers of different textures have different effects on the bearing capacity of the foundation. Therefore, in construction, mixing piles of different diameters may be required to meet the bearing capacity requirements of different soil layers. At the same time, the actual lateral pressure load of the soil body is relatively small in the upper part, while it is larger in the lower part. This also requires the use of mixing piles of different diameters in the design. In construction, if all small-diameter piles are used, the strength of the cement-soil mixing piles may be insufficient, posing a safety hazard. If all large-diameter piles are used, a large amount of curing agent may be wasted, increasing costs. Therefore, when selecting the specifications of the mixing piles, it is necessary to fully consider the properties of the soil layer, the distribution of lateral pressure, and the cost-effectiveness to ensure the safety and stability of the project under the premise of economic feasibility.

[0005] Therefore, a longitudinally rotating telescopic blade for a cement-soil bidirectional mixing pile is designed. Utility Model Content

[0006] The utility model mainly aims at the above problems existing in the prior art and provides a longitudinally rotating telescopic blade for a cement-soil bidirectional mixing pile.

[0007] The purpose of this utility model is mainly achieved through the following solutions:

[0008] A longitudinally rotating telescopic blade for a cement-soil bidirectional mixing pile comprises an outer drill rod and an inner drill rod which are vertically arranged, the outer drill rod being hollow inside and open at both ends, the inner drill rod being hollow inside, open at the top and closed at the bottom, the inner drill rod being sleeved in the outer drill rod at intervals, the rotating telescopic blade comprising two groups of spiral blade groups, and the two groups of spiral blade groups are respectively fixed to the outer side wall of the lower part of the outer drill rod and the outer side wall of the lower part of the inner drill rod through shaft sleeves; each group of the spiral blade groups comprises two symmetrically arranged blade group units, and each single-piece group unit comprises a rotating mechanism and a telescopic blade mechanism, the rotating mechanism is mounted on the side wall of the shaft sleeve, and the rotating mechanism can drive the telescopic blade mechanism to rotate, and the telescopic length of the telescopic blade mechanism is adjustable.

[0009] Preferably, the rotating mechanism includes a protective box and a rotating assembly horizontally installed in the protective box, the side of the protective box close to the sleeve is fixedly connected to the outer wall of the sleeve, the side of the protective box away from the sleeve is open, and a sealing plate is provided inside the protective box, and the rotating mechanism is installed in a closed cavity surrounded by the sealing plate and the protective box.

[0010] Preferably, the retractable blade mechanism comprises a rotating disk and a plurality of retractable blade assemblies mounted on the outer side of the rotating disk, the output shaft of the rotating assembly extends out of the sealing plate and is fixedly connected to the inner side of the rotating disk, and the output shaft of the rotating assembly is coaxially arranged with the rotating disk.

[0011] Preferably, the rotating disk is located at the opening of the protection box, and a clearance fit is formed between an outer wall of the rotating disk and an inner wall of the protection box.

[0012] Preferably, the telescopic blade assembly comprises a first telescopic sleeve and a second telescopic rod which are arranged horizontally, wherein the inner end of the first telescopic sleeve is closed and the outer end is open, and the second telescopic rod is inserted into the first telescopic sleeve.

[0013] Preferably, the inner end of the first telescopic sleeve is fixedly mounted on the outer side surface of the rotating disk, a telescopic assembly is installed inside the first telescopic sleeve near its inner end, and the telescopic end of the telescopic assembly is fixedly connected to the inner end of the second telescopic rod.

[0014] Preferably, a plurality of sealing rings are provided inside the first telescopic sleeve along its length direction, and the inner wall of the sealing ring fits with the outer wall of the second telescopic rod.

[0015] Preferably, the outer wall of the first telescopic sleeve and the outer wall of the outer end of the second telescopic rod are both provided with spiral cutting edges.

[0016] Preferably, the extension length of the telescopic blade assembly on the outer drill rod is greater than the extension length of the telescopic blade assembly on the inner drill rod.

[0017] Preferably, a plurality of sets of ball-tooth drill bits are provided at the bottom of the protection box.

[0018] Therefore, compared with the prior art, the utility model has the following advantages:

[0019] (1) The utility model provides a rotating mechanism and a telescopic blade mechanism. The rotating mechanism can drive the telescopic blade mechanism to rotate as a whole, so that the telescopic blade mechanism can not only realize horizontal rotation under the drive of the inner drill rod or the outer drill rod, but also realize longitudinal rotation under the drive of the rotating mechanism, thereby overcoming the limitations of traditional two-way mixing piles, improving the mixing uniformity and reinforcement effect of soil and curing agent, and is particularly suitable for foundation engineering applications in soft soil, soil with high water content and complex geological conditions;

[0020] (2) The utility model provides a first telescopic sleeve, a second telescopic rod and a telescopic assembly. The telescopic assembly can drive the second telescopic rod to move along the inside of the first telescopic sleeve, and can flexibly adjust the extension length of the second telescopic rod according to different pile diameters, thereby improving the adaptability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is a schematic diagram of the internal structure of the protective box in the utility model;

[0023] Figure 3 It is a schematic diagram of the internal structure of the first telescopic sleeve in the utility model.

[0024] Illustrations: 1-outer drill rod, 2-inner drill rod, 3-sleeve, 4-blade assembly unit, 5-rotation mechanism, 6-telescopic blade mechanism, 7-protection box, 8-rotation assembly, 9-sealing plate, 10-rotating disk, 11-telescopic blade assembly, 12-first telescopic sleeve, 13-second telescopic rod, 14-telescopic assembly, 15-sealing ring, 16-spiral cutting edge, 17-ball tooth drill bit, 18-water distribution jacket, 19-flange, 20-rotating water inlet. DETAILED DESCRIPTION

[0025] The technical solution of the utility model is further described in detail below through specific embodiments and in combination with the accompanying drawings. It should be understood that the implementation of the utility model is not limited to the following embodiments, and any form of modification and / or change made to the utility model will fall within the protection scope of the utility model.

[0026] In the present invention, unless otherwise specified, all parts and percentages are weight units, and the equipment and raw materials used can be purchased from the market or are commonly used in the field. The methods in the following embodiments, unless otherwise specified, are conventional methods in the field. The components or equipment in the following embodiments, unless otherwise specified, are universal standard parts or components known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or conventional experimental methods.

[0027] Example:

[0028] like Figure 1 As shown, the utility model provides a technical solution, a longitudinally rotating telescopic blade of a cement-soil bidirectional mixing pile, comprising an outer drill rod 1 and an inner drill rod 2 arranged vertically, the outer drill rod 1 is hollow inside and open at both ends, the inner drill rod 2 is hollow inside, open at the top and closed at the bottom, the inner drill rod 2 is sleeved in the outer drill rod 1 at intervals, and the lower end of the inner drill rod 2 extends out of the bottom of the outer drill rod 1, a drill bit is connected to the bottom of the inner drill rod 2, and a grouting hole is opened at the lower part of the inner drill rod 2, and the outer wall of the outer drill rod 1 is fixedly connected by upper and lower two sets of flanges 19 A water dividing sleeve 18 is provided to form a sealed cavity. A water and gas pipeline is arranged in the sealed cavity between the outer drill rod 1 and the water dividing sleeve 18, and a spiral groove compatible with the water and gas pipeline is arranged on the outer wall of the outer drill rod 1. A rotating water inlet 20 is arranged on the upper part of the outer wall of the water dividing sleeve 18, and a water outlet is arranged at the bottom; the outer drill rod 1 and the inner drill rod 2 have opposite directions of rotation. In actual use, the inner drill rod 2 and the outer drill rod 1 are respectively driven by an existing driving device such as a driving motor to realize rotational motion, which is a prior art and will not be repeated here.

[0029] The rotating telescopic blade is composed of two groups of spiral blade groups, and the two groups of spiral blade groups are respectively fixed to the outer side wall of the lower part of the outer drill rod 1 and the outer side wall of the lower part of the inner drill rod 2 through the shaft sleeve 3, and the shaft sleeve 3 is fixed to the outer side wall of the lower part of the outer drill rod 1 or the outer side wall of the lower part of the inner drill rod 2 through bolts; each group of spiral blade groups is composed of two blade group units 4 arranged symmetrically on the left and right, and each single-piece group unit is composed of a rotating mechanism 5 and a telescopic blade mechanism 6. The rotating mechanism 5 is fixedly installed on the side wall of the shaft sleeve 3, and the rotating mechanism 5 can drive the telescopic blade mechanism 6 to rotate, and the telescopic length of the telescopic blade mechanism 6 is adjustable. The design of this structure is aimed at improving the production performance and operating efficiency of the overall equipment, while ensuring the improvement of sealing and mixing quality.

[0030] Specifically, the rotating mechanism 5 consists of a protective box 7 and a rotating assembly 8 horizontally installed in the protective box 7. The side of the protective box 7 close to the sleeve 3 is fixedly connected to the outer wall of the sleeve 3 by bolts. The side of the protective box 7 away from the sleeve 3 is open, and a sealing plate 9 is fixedly provided inside the protective box 7 by bolts. The rotating mechanism 5 is fixedly installed in a closed cavity surrounded by the sealing plate 9 and the protective box 7 by bolts. The rotating mechanism 5 adopts a driving motor and should be installed horizontally so that the telescopic blade mechanism 6 can rotate longitudinally to achieve cutting of soil and mixing of soil and curing agent.

[0031] Specifically, the retractable blade mechanism 6 is composed of a rotating disk 10 and a plurality of retractable blade assemblies 11 installed on the outer side of the rotating disk 10. In the present embodiment, three retractable blade assemblies 11 are arranged on the upper and lower sides. The output shaft of the rotating assembly 8 extends out of the sealing plate 9 and is fixedly connected to the inner side of the rotating disk 10 by bolts, and the output shaft of the rotating assembly 8 is coaxially arranged with the rotating disk 10.

[0032] Specifically, the rotating disk 10 is located at the opening of the protection box 7 , and the outer wall of the rotating disk 10 and the inner wall of the protection box 7 are gap-fitted.

[0033] Specifically, the telescopic blade assembly 11 includes a first telescopic sleeve 12 and a second telescopic rod 13 which are horizontally arranged. The inner end of the first telescopic sleeve 12 is closed and the outer end is open. The second telescopic rod 13 is inserted into the first telescopic sleeve 12 .

[0034] Specifically, the inner end of the first telescopic sleeve 12 is fixedly mounted on the outer side surface of the rotating disk 10 by bolts, and a telescopic assembly 14 is horizontally mounted on the inner end of the first telescopic sleeve 12 by bolts. The telescopic assembly 14 adopts a push rod motor or a hydraulic cylinder, and the telescopic end of the telescopic assembly 14 is fixedly connected to the inner end of the second telescopic rod 13 by bolts.

[0035] Specifically, a plurality of sealing rings 15 are provided inside the first telescopic sleeve 12 along its length direction. The sealing rings 15 are made of rubber, and the inner wall of the sealing ring 15 is in contact with the outer wall of the second telescopic rod 13 .

[0036] Specifically, the outer wall of the first telescopic sleeve 12 and the outer wall of the outer end of the second telescopic rod 13 are both integrally provided with a spiral cutting edge 16 .

[0037] Specifically, the extension length of the telescopic blade assembly 11 on the outer drill rod 1 is greater than the extension length of the telescopic blade assembly 11 on the inner drill rod 2, and the diameter of the sleeve on the outer drill rod 1 can be designed to be greater than the diameter of the sleeve on the inner drill rod 2.

[0038] Specifically, a plurality of groups of ball-tooth drill bits 17 are welded to the bottom of the protection box 7 .

[0039] The specific working process is as follows:

[0040] 1) The cement slurry flows downward along the inner hole of the inner drill rod 2 and is discharged from the grouting hole at the bottom of the inner drill rod 2. While the blade assembly unit 4 cuts the soil, the cement slurry is stirred and mixed with the soil to form a cement-soil mixture. This process releases the cement slurry, allowing it to be fully mixed with the cut soil to eventually form cement-soil;

[0041] 2) The winch is then used to drive the entire drill rod up and down to form a cement soil pile of a certain diameter;

[0042] 3) A pile body is gradually formed underground, and a certain amount of water and air are introduced into the water-dividing sleeve 18 to soften the soil layer, thereby improving the bearing capacity of the pile body and facilitating the subsequent drilling process. After water is introduced into the pile body, the outer drill rod 1 rotates and drives the water-dividing sleeve 18 to evenly spray the water into the pile body, thereby softening and removing the soil layer around the pile body, which helps to improve the adhesion between the pile body and the soil layer, thereby improving the bearing capacity of the pile foundation;

[0043] 4) After completing the stirring in the previous stage, foam liquid can be introduced through the water dividing sleeve 18, and then the driving device can be restarted at low power to drive the drill rod to rotate. This process can not only use the foam liquid to automatically clean the drill rod and the blade assembly unit 4, but also prepare for the next step of work. The introduction of foam liquid can achieve effective equipment maintenance and cleaning, ensuring the smooth progress of construction.

[0044] The utility model provides a longitudinally rotating telescopic blade of a cement-soil bidirectional mixing pile. Through the provided rotating mechanism and telescopic blade mechanism, the rotating mechanism can drive the telescopic blade mechanism to rotate as a whole, so that the telescopic blade mechanism can not only realize horizontal rotation under the drive of the inner drill rod or the outer drill rod, but also realize longitudinal rotation under the drive of the rotating mechanism, thereby overcoming the limitations of traditional bidirectional mixing piles, improving the mixing uniformity and reinforcement effect of soil and curing agent, and being particularly suitable for foundation engineering applications under soft soil, soil with high water content and complex geological conditions; through the provided first telescopic sleeve, second telescopic rod and telescopic assembly, the telescopic assembly can drive the second telescopic rod to move along the inside of the first telescopic sleeve, and then can flexibly adjust the elongation length of the second telescopic rod according to different pile diameters, thereby improving the adaptability of the device.

[0045] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A longitudinally rotating telescopic blade for a cement-soil bidirectional mixing pile, comprising an outer drill rod (1) and an inner drill rod (2) arranged vertically, wherein the outer drill rod (1) is hollow inside and has two openings at both ends, and the inner drill rod (2) is hollow inside, has an opening at the top and is closed at the bottom, and the inner drill rod (2) is sleeved in the outer drill rod (1) at intervals, characterized in that: The rotary telescopic blade comprises two groups of spiral blade groups, and the two groups of spiral blade groups are respectively fixed to the outer side wall of the lower part of the outer drill rod (1) and the outer side wall of the lower part of the inner drill rod (2) through a shaft sleeve (3); each group of the spiral blade groups comprises two symmetrically arranged blade group units (4), and each single blade group unit comprises a rotating mechanism (5) and a telescopic blade mechanism (6); the rotating mechanism (5) is mounted on the side wall of the shaft sleeve (3), and the rotating mechanism (5) can drive the telescopic blade mechanism (6) to rotate, and the telescopic length of the telescopic blade mechanism (6) is adjustable.

2. The longitudinally rotating telescopic blade of a cement-soil bidirectional mixing pile according to claim 1, characterized in that: The rotating mechanism (5) comprises a protective box (7) and a rotating assembly (8) horizontally mounted in the protective box (7); the side of the protective box (7) close to the shaft sleeve (3) is fixedly connected to the outer wall of the shaft sleeve (3); the side of the protective box (7) away from the shaft sleeve (3) is open; a sealing plate (9) is provided inside the protective box (7); and the rotating mechanism (5) is mounted in a closed cavity surrounded by the sealing plate (9) and the protective box (7).

3. The longitudinally rotating and retractable blade of a cement-soil bidirectional mixing pile according to claim 2, characterized in that: The telescopic blade mechanism (6) comprises a rotating disk (10) and a plurality of telescopic blade assemblies (11) mounted on the outer side of the rotating disk (10); the output shaft of the rotating assembly (8) extends out of the sealing plate (9) and is fixedly connected to the inner side of the rotating disk (10); and the output shaft of the rotating assembly (8) is coaxially arranged with the rotating disk (10).

4. The longitudinally rotating and retractable blade of a cement-soil bidirectional mixing pile according to claim 3, characterized in that: The rotating disk (10) is located at the opening of the protection box (7), and a clearance fit is formed between the outer wall of the rotating disk (10) and the inner wall of the protection box (7).

5. The longitudinally rotating telescopic blade of a cement-soil bidirectional mixing pile according to claim 4, characterized in that: The telescopic blade assembly (11) comprises a first telescopic sleeve (12) and a second telescopic rod (13) which are arranged horizontally, the first telescopic sleeve (12) having a closed inner end and an open outer end, and the second telescopic rod (13) being inserted into the first telescopic sleeve (12).

6. The longitudinally rotating and retractable blade of a cement-soil bidirectional mixing pile according to claim 5, characterized in that: The inner end of the first telescopic sleeve (12) is fixedly mounted on the outer side surface of the rotating disk (10), a telescopic assembly (14) is mounted inside the first telescopic sleeve (12) near its inner end, and the telescopic end of the telescopic assembly (14) is fixedly connected to the inner end of the second telescopic rod (13).

7. The longitudinally rotating and retractable blade of a cement-soil bidirectional mixing pile according to claim 6, characterized in that: A plurality of groups of sealing rings (15) are provided inside the first telescopic sleeve (12) along its length direction, and the inner wall of the sealing ring (15) is in contact with the outer wall of the second telescopic rod (13).

8. The longitudinally rotating and retractable blade of a cement-soil bidirectional mixing pile according to claim 7, characterized in that: The outer wall of the first telescopic sleeve (12) and the outer wall of the outer end of the second telescopic rod (13) are both provided with a spiral cutting edge (16).

9. The longitudinally rotating and retractable blade of a cement-soil bidirectional mixing pile according to claim 8, characterized in that: The extended length of the telescopic blade assembly (11) located on the outer drill rod (1) is greater than the extended length of the telescopic blade assembly (11) located on the inner drill rod (2).

10. The longitudinally rotating and retractable blade of a cement-soil bidirectional mixing pile according to claim 9, characterized in that: A plurality of groups of ball-tooth drill bits (17) are provided at the bottom of the protection box (7).

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