CN109339126B

CN109339126B - Pile forming simulation device for indoor solidified pile body

Info

Publication number: CN109339126B
Application number: CN201811349892.0A
Authority: CN
Inventors: 桂跃; 吴承坤; 张秋敏; 方超; 刘锐; 刘声钧; 赵振兴; 余志华
Original assignee: Kunming University of Science and Technology
Current assignee: Kunming University of Science and Technology
Priority date: 2018-11-14
Filing date: 2018-11-14
Publication date: 2020-08-18
Anticipated expiration: 2038-11-14
Also published as: CN109339126A

Abstract

The invention discloses a pile forming simulation device for an indoor solidified pile body, which comprises a bracket, a stirring part, a test box part and a material injection pump, wherein the stirring part is arranged on the bracket; the device comprises a test box component, a stirring component, a limiting pipe and a supporting rod, wherein the test box component is positioned at the inner lower part of a support, the stirring component is positioned at the upper part of the test box component, the support comprises a support I, a support II, a support III, a limiting pipe and a supporting rod, the stirring component comprises a grouting pipe, a three-branch pipe, a rocker, a handle, a drill rod, blades, a grout spraying port and a drill bit, and the test box component comprises a test box, more than one clamp and a base. The invention solves the difficulties of more materials needed by the solidified pile body, large equipment volume and easy environmental pollution in the actual engineering, and researches a better curing agent formula through the device.

Description

Pile forming simulation device for indoor solidified pile body

Technical Field

The invention relates to a pile-forming simulation device for an indoor solidified pile body, and belongs to the field of geotechnical engineering.

Background

Various soft soils are widely distributed in China, and are mainly characterized by large natural water content, high compressibility, low shear strength, small water permeability, thixotropy and rheological property. Soft soils have a significant structural character, are significantly reduced in strength once disturbed, have significant rheology and can produce greater secondary consolidation settlement. The settlement of the building on the soft soil foundation is large, and the settlement stabilization time is long. The engineering property of the soft soil is special, if the soft soil is not treated or is not treated properly in the construction, a series of problems such as building cracking, house collapse, building inclination and the like caused by building foundation settlement often occur, the life and property safety of people is seriously threatened, the service life of the building is shortened, and therefore the curing treatment of the soft soil foundation is particularly important.

In actual engineering, because the curing agent dosage is large, the strength of the finally cured soft soil is difficult to predict and determine, the soft soil with insufficient strength after curing is difficult to rework, and the curing agent formula is not suitable. In order to better develop a curing agent and a construction process more suitable for curing soft soil and predict information such as strength of cured soft soil in advance, a pile forming simulation device for an indoor cured pile body is urgently needed.

Disclosure of Invention

The invention aims to provide a pile-forming simulation device for an indoor solidified pile body, which is used for solving the problems of improper curing agent and construction process of soft soil solidification in the actual engineering, and predicting the information of the strength and the like of the solidified soft soil in advance so as to enable the data in the actual engineering to be more sufficient.

The technical scheme of the invention is as follows: a pile-forming simulation device for an indoor solidified pile body comprises a support, a stirring part, a test box part and a material injection pump;

the support comprises a support I, a support II, a support III, a limiting pipe and supporting rods, wherein the support I and the support III are both of hollow cuboid structures, the support II is positioned between the support I and the support III, the support II comprises 4 inclined rods, the 4 inclined rods respectively fixedly connect four top points at the top of the support I with four top points at the bottom of the support III, the upper surface and the lower surface of the cuboid structure of the support III are respectively and horizontally and vertically fixed with the two supporting rods, the intersection of the two horizontally and vertically fixed supporting rods is a rectangular gap, the limiting pipe is a hollow cylindrical pipe, the top end and the bottom end of the limiting pipe are respectively and fixedly connected with the intersection of the horizontally and vertically fixed supporting rods at the upper surface and the lower surface of the cuboid structure of the support III, and the cleaning plate is installed in the support II;

the stirring component comprises a grouting pipe, a three-branch pipe, a rocker, a handle, a drill rod, blades, a guniting port and a drill bit; the drill rod is sleeved in the limiting pipe, the top end of the drill rod penetrates through the top end of the limiting pipe and is communicated with the bottom of the grouting pipe through the Y-shaped pipe, the top of the Y-shaped pipe is communicated with the bottom of the grouting pipe, the bottom of the Y-shaped pipe is communicated with the top of the drill rod, the side face of the Y-shaped pipe is connected with one end of the rocker, the handle is sleeved on the outer side of the other end of the rocker, the top of the grouting pipe is communicated with the grouting pump, the bottom end of the drill rod sequentially penetrates through the limiting pipe and the cleaning plate and extends into the test box, the bottom end of the drill rod is connected with the drill bit, the drill rod and the drill bit are hollow, the bottom of the drill bit is provided with a grout spraying;

the test box component comprises a test box, more than one clamp and a base; the test box is installed below the stirring part and is of a cylinder structure without a top cover and a bottom, the side face of the test box is a cylinder side face obtained by splicing two semi-cylinder side walls, a water drainage hole is formed in the side face of the test box, more than one clamp is arranged on the outer side face of the test box, and the lower end of the test box is fixed on the base.

Two rows of blades are arranged at the lower part of the drill bit, each row comprises two blades, each blade is perpendicular to the drill rod, and the cross section of each blade forms an angle of 45 degrees with the drill rod.

The bottom end of the drill bit is conical.

The outer surface of the base is also provided with a clamp.

The rocker is provided with a bulge for limiting the handle to move up and down.

The cleaning plate is used for cleaning mud and slurry on the drill rod.

The limiting pipe ensures that the drill rod moves up and down in the vertical direction.

The top of the three-branch pipe is detachably connected with the bottom of the grouting pipe, and the bottom of the three-branch pipe is detachably connected with the top of the drill rod.

The invention has the beneficial effects that:

(1) the invention solves the problem that the curing agent and the construction process for curing the soft soil are not proper in the actual engineering, and the information such as the strength of the cured soft soil is predicted in advance, so that the data in the actual engineering are more sufficient.

(2) The invention provides a large amount of reliable data of the actual engineering, and greatly reduces the design defects brought to the engineering design due to insufficient data.

(3) The invention has small volume, can practically simulate the actual pile body solidification of a project, and can be carried out indoors.

(4) The invention solves the difficulties of more materials needed by the solidified pile body, large equipment volume and easy environmental pollution in the actual engineering, and researches a better formula of the solidifying agent through the device.

Drawings

FIG. 1 is a side view of the apparatus of the present invention;

FIG. 2 is a top view of the bracket of the present invention;

FIG. 3 is a side view of a test chamber of the present invention;

FIG. 4 is a side view of the stirring member of the present invention;

FIG. 5 is a front view of the drill bit of the present invention;

the reference numbers in the figures: 1-bracket I; 2-scaffold ii; 3-scaffold iii; 4-a drill bit; 5-a diagonal rod; 6-a limiting pipe; 7-a support bar; 8-cleaning the plate; 9-grouting pipe; 10-Y-pipe; 11-a rocker; 12-a handle; 13-a drill rod; 14-a blade; 15-a guniting port; 16-a test chamber; 17-a weep hole; 18-a clamp; 19-base.

Detailed Description

The invention will be further described with reference to the following figures and examples, without however restricting the scope of the invention thereto.

Example 1: as shown in fig. 1-5, a pile-forming simulation device for an indoor solidified pile body comprises a support, a stirring part, a test box part and a material injection pump;

the bracket comprises a bracket I1, a bracket II 2, a bracket III 3, a limiting pipe 6 and a supporting rod 7, the bracket I1 and the bracket III 3 are both hollow cuboid structures, the bracket II 2 is positioned between the bracket I1 and the bracket III 3, the bracket II 2 comprises 4 inclined rods 5, the four top points at the top of the bracket I1 and the four top points at the bottom of the bracket III 3 are respectively and fixedly connected by the 4 inclined rods 5, two support rods 7 are respectively fixed on the upper surface and the lower surface of the cuboid bracket III 3 in the transverse direction and the vertical direction, the junction of the two transverse and vertical fixed support rods 7 is a rectangular gap, the limiting tube 6 is a hollow cylindrical tube, the top end and the bottom end of the limiting tube 6 are respectively fixed at the junction of the transverse and vertical fixed support rods 7 on the upper surface and the lower surface of the cuboid structure of the bracket III 3, and the cleaning plate 8 is installed in the bracket II 2;

the stirring component comprises a grouting pipe 9, a three-branch pipe 10, a rocker 11, a handle 12, a drill rod 13, blades 14, a guniting port 15 and a drill bit 4; the drill rod 13 is sleeved in the limiting pipe 6, the top end of the drill rod 13 penetrates through the top end of the limiting pipe 6 and is communicated with the bottom of the grouting pipe 9 through the Y-shaped pipe 10, the top of the Y-shaped pipe 10 is communicated with the bottom of the grouting pipe 9, the bottom of the Y-shaped pipe 10 is communicated with the top of the drill rod 13, the side face of the Y-shaped pipe 10 is connected with one end of the rocker 11, the handle 12 is sleeved on the outer side of the other end of the rocker 11, the top of the grouting pipe 9 is communicated with a grouting pump, the bottom end of the drill rod 13 sequentially penetrates through the limiting pipe 6 and the cleaning plate 8 and extends into the test box 16, the bottom end of the drill rod 13 is connected with the drill bit 4, the drill rod 13 and the drill bit 4 are hollow, two grouting ports 15 are formed in the bottom of the drill bit 4, blades 14 are arranged;

the test box component comprises a

test box

16, 3 clamps 18 and a base 19; the test box 16 is installed below the stirring component, the test box 16 is of a cylinder structure without a top cover and a bottom, the side face of the test box 16 is a cylinder side face obtained by splicing two semi-cylinder side walls, a water drainage hole 17 is formed in the side face of the

test box

16, 3 hoops 18 are arranged on the outer side face of the test box 16, and the lower end of the test box 16 is fixed on a base 19.

The lower part of the drill head 4 is provided with two rows of blades 14, each row comprises two blades 14, each blade 14 is perpendicular to the drill rod 13, and the cross section of each blade 14 forms an angle of 45 degrees with the drill rod 13.

The bottom end of the drill 4 is conical.

A clip 18 is also provided on the outer surface of the base 19.

Example 2: the structure of the embodiment is the same as that of the embodiment 1, except that a protrusion is arranged on the rocker 11 and used for limiting the handle to move up and down.

The pile-forming simulation device for the indoor solidified pile body comprises the following specific operation steps:

placing a test box on a base 19, hooping a hoop 18, cutting a sufficient amount of soil sample from an original soil sample according to engineering requirements, uniformly placing the cut soil sample in the test box 16 for layering and compaction, adjusting the positions of the base 19 and a drill bit 20, determining hole positions (1, 2 and 3), and coding pile numbers (1, 2 and 3), hole numbers (1, 2 and 3) and sequence numbers (1, 2 and 3);

and (3) construction of a stirring pile: lofting the pile position No. 1, and determining a specific pile position; the drill bit 4 is in place, the length of the drill rod 13 and the diameter of the drill bit 4 are checked, the drill bit 4 is moved to a specified position to align the pile position, the drill bit 4 is centered, leveled and corrected for verticality after reaching a calibrated hole position, the drill bit 4 and the drill rod 13 are ensured to form 90 degrees with the ground, and the pile verticality error is ensured to be within 1.0 percent; inspecting and leveling the drill bit 4 and the drill rod 13; stirring the curing agent, namely stirring the curing agent according to technical parameters, fully and uniformly stirring the curing agent, pouring the slurry into an injection pump before grouting, and connecting the injection pump to an injection pipe 9; drilling in a positive circulation mode to a designed depth, holding the handle 12, and rotating the rocker 11 to enable the drill bit 4 to cut soil along the limiting pipe 6 and stir to sink; opening the material injection pump; the reverse circulation is carried out while the grouting is carried out and the pile is lifted to be 0.05m above the designed pile surface, after the drill bit 4 sinks to the designed depth, the material injection pump is started, the outlet pressure of the material injection pump is kept at 0.4-0.6 Mpa, the curing agent is continuously injected, the rotary spraying speed of the drill bit 4 is controlled, when the pile is lifted to the designed elevation, the lifting is stopped, and the stirring is carried out for several seconds, so that the pile is uniform and compact; and (3) repeatedly stirring and drilling, wherein in order to fully stir the curing agent sprayed into the soil and the soil, the curing agent is repeatedly stirred and sunk until the depth required by the design, then the curing agent is stirred and lifted, and the curing agent is repeatedly sprayed along the lower part of the pile body within the range of 0.05 m. After the construction is finished, injecting a proper amount of clear water into the material injection pump, starting the material injection pump, cleaning residual curing agent in the pipeline, and simultaneously removing the adhered soil of the drill bit 4; lifting the drill bit to the ground surface of the pile top in a reverse circulation manner and then lifting the drill bit out of the ground; finishing pile forming;

and the construction of the stirring piles No. 2 and No. 3 is as the construction of the stirring pile No. 1.

The grouting of the pile body is required to be completed at one time without interruption, and each pile is preferably filled with grouting once and sprayed and stirred.

During construction, the slurry is stopped due to reasons, the stirrer is preferably sunk to a position 5cm below the slurry stopping point, and slurry supply is resumed and then stirring and lifting are carried out. And a construction process of three-spraying and three-stirring is adopted during stirring.

Three-spraying and three-stirring: and drilling down to spray the slurry, lifting up to spray the slurry, and repeating once to finish the three-spraying.

When the device works, the handle 12 is held, the rocker 11 is rotated, the drill bit 4 is enabled to cut soil along the limiting pipe 6 and stir and sink (or ascend), and the rotary spraying speed of the drill bit 4, the ascending and descending of the drill bit 4 and the positive and negative circulation of the drill bit 4 are controlled by controlling the handle 12. The curing agent is pumped from the grout tube 9, drill pipe 13 and drill bit 4 into the test chamber 16 by an injection pump. The hole position is changed by moving the position of the base 19.

While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. A pile-forming simulation device for an indoor solidified pile body is characterized by comprising a support, a stirring part, a test box part and a material injection pump;

the support comprises a support I (1), a support II (2), a support III (3), a limiting pipe (6) and support rods (7), wherein the support I (1) and the support III (3) are hollow cuboid structures, the support II (2) is located between the support I (1) and the support III (3), the support II (2) comprises 4 inclined rods (5), the 4 inclined rods (5) respectively fixedly connect four top points at the top of the support I (1) with four top points at the bottom of the support III (3), the two support rods (7) are respectively fixed on the upper surface and the lower surface of the cuboid structure of the support III (3) in the horizontal and vertical directions, the intersection of the two horizontal and vertical fixed support rods (7) is a rectangular gap, the limiting pipe (6) is a hollow cylindrical pipe, and the top end and the bottom end of the limiting pipe (6) are respectively fixed on the cuboid structure of the support III (3), The cleaning plate (8) is arranged in the bracket II (2) at the intersection of the supporting rods (7) which are fixed transversely and vertically on the lower surface;

the stirring component comprises a grouting pipe (9), a three-branch pipe (10), a rocker (11), a handle (12), a drill rod (13), blades (14), a guniting port (15) and a drill bit (4); the drilling rod (13) is sleeved in the limiting pipe (6), the top end of the drilling rod (13) penetrates through the top end of the limiting pipe (6) and is communicated with the bottom of the grouting pipe (9) through the Y-pipe (10), the top of the Y-pipe (10) is communicated with the bottom of the grouting pipe (9), the bottom of the Y-pipe (10) is communicated with the top of the drilling rod (13), the side face of the Y-pipe (10) is connected with one end of the rocker (11), the handle (12) is sleeved on the outer side of the other end of the rocker (11), the top of the grouting pipe (9) is communicated with a grouting pump, the bottom end of the drilling rod (13) sequentially penetrates through the limiting pipe (6) and the cleaning plate (8) and extends into the test box (16), the bottom end of the drilling rod (13) is connected with the drill bit (4), the drilling rod (13) and the drill bit (4) are hollow, the bottom of the drill bit (4) is provided with a grouting port (15), and the lower part of the, the blade (14) is positioned above the guniting port (15);

the test box component comprises a test box (16), more than one clamp (18) and a base (19); the test box (16) is installed below the stirring component, the test box (16) is of a cylinder structure without a top cover and a bottom, the side face of the test box (16) is a cylinder side face obtained by splicing two semi-cylinder side walls, a water drainage hole (17) is formed in the side face of the test box (16), more than one hoop (18) is arranged on the outer side face of the test box (16), and the lower end of the test box (16) is fixed on a base (19).

2. The pile-forming simulation device for the indoor solidified pile body of claim 1, wherein: two rows of blades (14) are arranged at the lower part of the drill bit (4), each row comprises two blades (14), each blade (14) is perpendicular to the drill rod (13), and the cross section of each blade (14) forms an angle of 45 degrees with the drill rod (13).

3. The pile-forming simulation device for the indoor solidified pile body of claim 1, wherein: the bottom end of the drill bit (4) is conical.

4. The pile-forming simulation device for the indoor solidified pile body of claim 1, wherein: the outer surface of the base (19) is also provided with a clamp (18).

5. The pile-forming simulation device for the indoor solidified pile body of claim 1, wherein: the rocker (11) is provided with a bulge.