CN208870028U - A kind of variable diameters cement mixer drill bit - Google Patents
A kind of variable diameters cement mixer drill bit Download PDFInfo
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- CN208870028U CN208870028U CN201821405315.4U CN201821405315U CN208870028U CN 208870028 U CN208870028 U CN 208870028U CN 201821405315 U CN201821405315 U CN 201821405315U CN 208870028 U CN208870028 U CN 208870028U
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Abstract
The utility model relates to a kind of variable diameters cement mixer drill bits, are rotatably connected at least one layer of blade layer and at least one layer of inferior lobe lamella on drilling rod including longitudinally disposed drilling rod and from top to bottom；Drilling rod is internally provided with longitudinal slip casting channel；Drilling rod lower end is provided with apex point；Multiple mouth sprays I are provided on apex point；The stirring blade of blade layer includes the main lobe sheet radially fixed with drilling rod and the pivoting leaf sheet with the rotation connection of main lobe sheet one end respectively；One end of main lobe sheet is welded with the block inconsistent with pivoting leaf sheet；The stirring blade of inferior lobe lamella includes the main stirring blade radially fixed with drilling rod and the auxiliary stirring blade for being fixed on main stirring blade one end downward；Radial defeated slurry channel is equipped in main stirring blade and auxiliary stirring blade；Open the mouth spray II towards drilling rod in the defeated slurry channel both ends of radial direction in auxiliary stirring blade.
Description
Technical field
The utility model relates to capital construction field, specifically a kind of variable diameters cement mixer drill bit.
Background technique
Cement mixing pile is to be stirred the curing agent such as cement and foundation soil pressure on the spot along depth by special blender
Form cement earth pile, make weak soil harden and the method that improves foundation strength to strengthening soft foundation.This method is suitable for place
The positions such as soft soil foundation, back filling behind abutment are managed, has many advantages, such as obvious processing effect, can come into operation quickly after processing.
The cement mixing pile of conventional list diameter is four construction technologies for stirring two sprays, in the treatment of soft foundation of muck soil, water
Mud whitewashing is not enough with foundation soil stirring, cannot form complete entirety, usually insufficient in cement mixing pile due to stirring
Occur pile body tomography after pile body coring and there is the cement fragment that differs in size and tile, pile body center without cement slurry, intensity not
Foot and other issues；On the other hand, the cement mixing pile of conventional single diameter applies in general to soft soil foundation, does not need stirring
Form the soil layer of pile foundation；And when for composite foundation processing, such as reinforce mud, muck soil, plain fill, cohesive soil, silt
Or the soil layers such as medium coarse sand, the problems such as cement mixing pile of conventional single diameter will appear grout, vertical bearing capacity is low.
Utility model content
In order to solve the above problem present in the prior art, the utility model provides a kind of variable diameters cement mixer
Drill bit is suitable for reinforcing the soil layers such as mud, muck soil, plain fill, cohesive soil, silt or medium coarse sand, can be realized soil matrix
It is sufficiently stirred and mixes, solve and asked since the porosity, the pile body integrity that stir insufficient appearance are bad, dowel pin intensity is low etc.
Topic.
The technical solution of the utility model is as follows:
A kind of variable diameters cement mixer drill bit is fixedly connected on described including longitudinally disposed drilling rod and from top to bottom
At least one layer of blade layer and at least one layer of inferior lobe lamella of Stirring are used on drilling rod；Setting inside the drilling rod
There is longitudinal slip casting channel for conveying slurry；The drilling rod lower end is provided with apex point；Be provided on the apex point it is multiple with it is vertical
The mouth spray I for being connected to and being open outwardly to slip casting channel；The stirring blade of upper leaf lamella includes radially fixed with drilling rod
Main lobe sheet and respectively the pivoting leaf sheet with the rotation connection of main lobe sheet one end, pivoting leaf sheet is deployable and then increases stake
Diameter；One end of the main lobe sheet is welded with the block inconsistent with pivoting leaf sheet；The stirring blade packet of the inferior lobe lamella
The auxiliary stirring blade for including the main stirring blade radially fixed with drilling rod and being fixed on main stirring blade one end downward；The master
The defeated slurry channel of radial direction being connected to longitudinal slip casting channel is equipped in stirring blade and auxiliary stirring blade；In the auxiliary stirring blade
Open the mouth spray II towards drilling rod in radial defeated slurry channel both ends.
Wherein, the drilling rod includes interior drilling rod and outer drilling rod that be mutually nested and being threadedly coupled；The interior run of steel is big
In outer run of steel；Setting longitudinal slip casting channel inside the interior drilling rod；The outer drilling rod socket is in interior drilling rod upper section；Institute
It states main lobe sheet and is welded on outer drilling rod outer ring；The main stirring blade is welded on interior drilling rod outer ring；The drilling rod can be in external electrical
It is driven under the driving of machine and carries out forward and reverse rotation.
Wherein, the pivoting leaf sheet includes the upper plate and lower plate for being arranged in parallel in main lobe sheet upper and lower surface；On described
Plate and lower plate form the closed end of pivoting leaf sheet far from the connection closed at one end of drilling rod, and the other end is open end；The opening
End is socketed in the main lobe sheet upper and lower surface and is fixed by a rivet, so that pivoting leaf sheet and the rotation of main lobe sheet connect
It connects；The longitudinal auxiliary cone tooth for being parallel to drilling rod is fixedly connected on the side wall of the blind end and open end.
Wherein, the main lobe sheet and pivoting leaf sheet are S-shaped strip；The main lobe sheet and rotating vane board group close and
At blade layer 15 ° ~ 20 ° of blade drift angle；The main stirring blade S-shaped circumferential direction drift angle 25 ° ~ 30.
Wherein, upper leaf lamella is by drilling rod up to being arranged with two layers；The upper and lower structures phase of upper leaf lamella
Together；The inferior lobe lamella is provided with two layers by supreme under drilling rod；The upper and lower structures of the inferior lobe lamella are identical；It is fixed on brill
Four layers of stirring blade on bar mutually stagger angle, and then realize that the foundation soil stirring of multi-angle is broken.
The utility model has the beneficial effects that
1, the utility model improves the drill bit of traditional cement mixing pile machine, provided with pivoting leaf sheet at least
One layer of blade layer and at least one layer of inferior lobe lamella, blade layer expand mixing pile diameter, benefit by rotation connection pivoting leaf sheet
Under the action of the cement mixing pile machine, is carried out in soil matrix and then be capable of forming that upper diameter is big, and lower part is straight when stirring cutting
The small pile foundation of diameter forms a kind of variable diameters cement mixer drill bit.
2, the stirring blade that the utility model forms multiple layer combination can adequately stir soil matrix, improve water
Mud mixing pile machine drill bit mixing uniformity, compactness；It is respectively arranged in inferior lobe lamella and apex point in horizontal direction and horizontal direction
Outer mouth spray enables cement throwing jet to be sufficiently stirred with foundation soil mixed so that pile body center and surrounding are filled with cement slurry
It is even to form complete entirety, there is the problem of pile body tomography, intensity deficiency after preventing cement mixing pile pile body coring.
3, the blade layer of the utility model and inferior lobe lamella can realize forward and reverse rotation by different motor drivens
Turn, forward and reverse rotation plays crushing, eliminates grout phenomenon, ensure that the cement mixed weight of cement mixing method, together
When improve the mixing uniformity of soil cement；The shearing force basic neutralisation that inside and outside drilling rod generates when two-way stirring, reduces construction
Disturbance to soil around pile.Meanwhile it is positive and negative rotate simultaneously, stirring efficiency improve, work efficiency improve by about one time.
4, the utility model improves stirring blade s shape, reduces blade tip resistance and damage, allow blade radially
Comparable moment of flexure shearing force, circumferential drift angle, level inclination and structure width are undertaken, so that stirring blade stress Email Filtering point
It is bright, guarantee stirring blade along horizontal radial uniform force and blade composite rigidity.
Detailed description of the invention
Positive structure schematic when Fig. 1 is the stirring blade stretching, extension of the utility model；
Fig. 2 is the positive structure schematic when stirring blade of the utility model is shunk；
Top view when Fig. 3 is the stirring blade stretching, extension of the utility model；
Fig. 4 is the top view when stirring blade of the utility model is shunk；
Fig. 5 is top view when the utility model is set as the stretching, extension of the double-deck blade layer；
Fig. 6 is top view when the utility model is set as the contraction of the double-deck blade layer；
Fig. 7 is positive structure schematic when the utility model is set as the stretching, extension of single layer blade layer；
Fig. 8 is positive structure schematic when the utility model is set as the contraction of single layer blade layer；
Top view when Fig. 9 is the blade layer stretching, extension of the utility model；
Figure 10 is the top view when blade layer of the utility model is shunk；
Figure 11 is the overlooking structure diagram that the utility model is set as the double-deck inferior lobe lamella；
Figure 12 is the overlooking structure diagram that the utility model is set as single layer inferior lobe lamella；
Figure 13 is the positive structure schematic that the utility model is set as single layer inferior lobe lamella.
Appended drawing reference indicates in figure are as follows:
1, drilling rod；11, longitudinal slip casting channel；12, apex point；13, mouth spray I；14, interior drilling rod；15, outer drilling rod；2, upper leaf
Lamella；21, main lobe sheet；22, pivoting leaf sheet；221, closed end；222, open end；223, upper plate；224, lower plate；23, it keeps off
Block；24, rivet；25, longitudinal auxiliary cone tooth；3, inferior lobe lamella；31, main stirring blade；32, auxiliary stirring blade；33, radial defeated slurry
Channel；34, mouth spray II.
Specific embodiment
The utility model is described in detail in the following with reference to the drawings and specific embodiments.
Referring to Fig. 1 to Figure 13, (part of drilling rod 1 is front section view in Fig. 1 and Fig. 2, it can be seen that indulging drilling rod 1 inside
To slip casting channel 11, when the blade layer 2 of first layer from top to bottom and 2 front of blade layer of the second layer are observed not because of angle
Different with the structure being presented in figure, two blade layer structure of essence are identical), a kind of cement mixing drill bit of pile machine, including longitudinal direction
The drilling rod 1 of setting and be fixedly connected on from top to bottom on the drilling rod 1 be used for Stirring at least one layer of 2 He of blade layer
Drilling rod 1 is pressed into soil matrix by least one layer of inferior lobe lamella 3 when stirring is driven piles, and blade layer 2 and inferior lobe lamella 3 rotate match simultaneously
Stirring is closed, and then improves the uniformity and density of foundation soil stirring；The drilling rod 1 is internally provided with for conveying the vertical of slurry
To slip casting channel 11；1 lower end of drilling rod is provided with apex point 12, and multiple and longitudinal slip casting channel 11 is provided on the apex point 12
The outside mouth spray I 13 of connection；Longitudinal slip casting channel 11 is connected to (not shown) with the Grouting Pipe of external slip casting machine, so that
Slurry passes through longitudinal slip casting channel 11 and enters drill bit, after can be sprayed and enter in foundation soil by mouth spray I 13；Upper leaf piece
The stirring blade of layer 2 includes the main lobe sheet 21 radially fixed with drilling rod 1 and is rotatablely connected respectively with 21 one end of main lobe sheet
Pivoting leaf sheet 22；The main lobe sheet 21 can be the primary blades for being welded on the plate of 1 opposite sides of drilling rod and being connected
Plate 21 can be in the rotating vane of the one or both ends of main lobe sheet 21 rotation connection when main lobe sheet 21 joins together
Plate 22；The plate for being welded on 1 opposite sides of drilling rod can also be split up into two panels main lobe sheet 21, when main lobe sheet 21 sets up two separately
It, can be in the pivoting leaf sheet 22 of the one or both ends of main lobe sheet 21 rotation connection when side；The pivoting leaf sheet 21 can open up
It drives into and increases a diameter, expand stirring range；；The both ends of the main lobe sheet 21 are welded with inconsistent with pivoting leaf sheet 22
Block 23；The block 23 is located at the opposite side of 22 circumgyration incision side of pivoting leaf sheet, can be avoided pivoting leaf sheet 22
Overturn when cutting piling；When drill bit is inserted into foundation soil, starting external motor (not shown) drives outer drilling rod
15 and interior drilling rod 14 rotate, and then main lobe sheet 21 and main stirring blade 31 is driven to rotate, driven by centrifugal force, pivoting leaf
Sheet 22 is thrown away stretching, extension, is carried out cutting to the soil matrix on periphery and is broken up, at this point, the two sides of pivoting leaf sheet 22 are used to cut on one side
Cut, given pivoting leaf sheet 22 active force opposite to the direction of rotation by soil matrix for cutting side, it is therefore desirable to cut
Block 23 is arranged in the opposite another side of cut edge, and block 23 is fixed in main lobe sheet 21 and does not cut with pivoting leaf sheet 22
Side it is inconsistent, provide another active force opposite with the active force that soil matrix is given for pivoting leaf sheet 22, and then avoid revolving
It is overturn caused by 22 unbalance stress of rotating vane sheet, therefore block 23 can play fixed work to the pivoting leaf sheet 22 in work
With；The stirring blade of the inferior lobe lamella 3 includes the main stirring blade 31 radially fixed with drilling rod 1 and is fixed on master downward
The auxiliary stirring blade 32 at 31 both ends of stirring blade；It is equipped in the main stirring blade 31 and auxiliary stirring blade 32 logical with longitudinal slip casting
The defeated slurry channel 33 of radial direction that road 11 is connected to；Defeated 33 both ends of slurry channel of 32 radial direction have been opened in horizontal direction in the auxiliary stirring blade
Mouth spray II 34；Slurry can be by flowing into the defeated slurry channel of radial direction in inferior lobe lamella 3 behind longitudinal slip casting channel 11 in drilling rod 1
In 33, under the influence of centrifugal force, slurry will be sprayed from mouth spray II 34 to 1 direction of drilling rod, be sprayed on foundation soil, stirred
Blended cement mortar while mixing.
Referring to Fig. 1 to Fig. 8, the drilling rod 1 includes interior drilling rod 14 and outer drilling rod 15 that be mutually nested and being threadedly coupled；It is described
Interior 14 length of drilling rod is greater than outer 15 length of drilling rod；The outer drilling rod 15 is socketed in interior 14 upper section of drilling rod；The main lobe sheet 21 is welded
It connects in outer 15 outer ring of drilling rod；The main stirring blade 31 is welded on interior 14 outer ring of drilling rod；The interior drilling rod 14 and outer drilling rod 15 can
Forward and reverse rotation is carried out under the driving of external motor (not shown), and then blade layer 2 and inferior lobe lamella 3 is driven to carry out
Positive direction rotation, when two-way stirring interior drilling rod 14, the shearing force basic neutralisation that generates of outer drilling rod 15, reduce construction to soil around pile
Disturbance.
Referring to Fig. 1 and Fig. 2, Fig. 7, Fig. 8, the pivoting leaf sheet 22 include being arranged in parallel in 22 upper and lower surface of main lobe sheet
Upper plate 223 and lower plate 224；The upper plate and lower plate form the closing of pivoting leaf sheet 22 far from the connection closed at one end of drilling rod
End 221, the other end are open end 222；The open end 222 is socketed in 21 upper and lower surface of main lobe sheet and by a rivet
24 is fixed, so that pivoting leaf sheet 22 and main lobe sheet 21 are rotatablely connected；On the side wall of the closed end 221 and open end 222
It is fixedly connected with the longitudinal auxiliary cone tooth 25 for being parallel to drilling rod 1；Longitudinal auxiliary cone tooth 25 is broken up more hard for cutting
Hard foundation soil improves the blending of foundation soil and slurry, mixed effect.
Referring to Fig. 1 to Fig. 4, upper leaf lamella 2 is provided with two layers by upper end to the lower end of drilling rod 1；Upper leaf lamella 2
Upper and lower structures it is identical；The inferior lobe lamella 3 is provided with two layers by lower end to the upper end of drilling rod 1；The inferior lobe lamella 3 it is upper
Understructure is identical；Angle is mutually staggered from can be seen that four layers of stirring blade being fixed on drilling rod 1 in Fig. 3 and Fig. 4, into
And realize that the foundation soil stirring of multi-angle is broken, although therefore two blade layers, 2 structure in fig. 1 and 2 it is identical,
When front is seen, the angle that two blade layers 2 are presented is different, and shape is different.
Referring to Fig. 3 to Fig. 6, Fig. 9 to Figure 12, the main lobe sheet 21 and pivoting leaf sheet 22 are S-shaped strip；The master
15 ° ~ 20 ° of the blade drift angle for the blade layer 2 that vane plate 21 and pivoting leaf sheet 22 are composed, as the angle α is blade in Fig. 5
The blade drift angle of layer 2；The angle α is made of A line and B line；The a line is fixed perpendicular to another blade layer 3 and drilling rod 1
The tangent line (C line) of point, B line are the end of blade layer 3 and the line at 1 center of drilling rod；The S-shaped of the main stirring blade 31 is circumferential
25 ° ~ 30 ° of drift angle, as the angle β is the circumferential drift angle of inferior lobe lamella 3 in Figure 11；The angle β is made of D line and E line；The D line
For perpendicular to another inferior lobe lamella 3 and tangent line (F line) after the fixation of drilling rod 1, E line is the end and 1 center of drilling rod of inferior lobe lamella 3
Line；The main lobe sheet 21 and main stirring blade 31 can be tilted a certain angle downwards, the main lobe sheet 21, main paddle
Piece 31 and perpendicular to the inclination angle between the plane of 1 axis of drilling rod be 10 ° ~ 15 °；The spacing between every layer of blade layer 2 being arranged
For 500mm；Spacing between every layer of inferior lobe lamella 3 is 300mm；The auxiliary of inferior lobe lamella 3 that 1 bottommost of drilling rod is arranged in stirs
Mixing the longitudinal height of blade 32 is 40mm；The auxiliary stirring blade 32 of another inferior lobe lamella 3 above bottommost inferior lobe lamella 3 is vertical
It is 60mm to height.
Working principle of the utility model is:
The variable diameters cement mixer drill bit of the utility model is squeezed into foundation soil, the stirring electricity of external connection is started
Machine, interior drilling rod 14 and outer drilling rod 15 carry out forward and reverse stirring under the driving of different stirring motor (not shown)s respectively,
At this point, the pivoting leaf sheet 22 of blade layer 2 is thrown away under the influence of centrifugal force, main lobe sheet 21 is extended, in turn
Expand stirring range, increases stake diameter；Meanwhile being connected to the grouting pipe of slip casting machine with longitudinal slip casting channel 11 in drilling rod 1, it will
Slurry injects longitudinal slip casting channel 11, can be by logical with longitudinal slip casting when the slurry in longitudinal slip casting channel 11 flow to apex point 12
The ejection of mouth spray I 13 horizontally outward that road 11 is connected to is mixed with foundation soil；Effect of the slurry in the postrotational centrifugal force of drilling rod 1
It is lower to enter in the defeated slurry channel 33 of radial direction being connected in the inferior lobe lamella 3 of drilling rod 1 with longitudinal direction slip casting channel 11, and from level
Inside mouth spray II 34 is sprayed onto mixed on the foundation soil of cement mixing pile, improves the pile quality of cement mixing pile；
Due to the direction of rotation and the direction of rotation for the inferior lobe lamella 3 for being welded on interior drilling rod 14 of the blade layer 2 welded with outer drilling rod 15
On the contrary, can control slurries between upper and lower two groups of stirring blades, blocks and emit approach on slurries, can either guarantee that soil cement stirs
The overall cement infiltration capacity of stake is mixed, and can ensure that cement slurry is evenly distributed along Soil-cement stake body.
The above description is only the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
Equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, is applied directly or indirectly in
Other related technical areas are also included in the patent protection scope of the utility model.
Claims (5)
1. a kind of variable diameters cement mixer drill bit, it is characterised in that: including longitudinally disposed drilling rod (1) and solid from top to bottom
Surely it is connected on the drilling rod (1) at least one layer of blade layer (2) of Stirring and at least one layer of inferior lobe lamella
(3)；The drilling rod (1) is internally provided with longitudinal slip casting channel (11) for conveying slurry；Drilling rod (1) lower end is provided with
Apex point (12)；Multiple mouth sprays I for being connected to and being open outwardly with longitudinal slip casting channel (11) are provided on the apex point (12)
(13)；The stirring blade of upper leaf lamella (2) include the main lobe sheet (21) radially fixed with drilling rod (1) and respectively with master
The pivoting leaf sheet (22) of vane plate (21) one end rotation connection, pivoting leaf sheet (22) is deployable and then increases stake diameter；It is described
One end of main lobe sheet (21) is welded with the block (23) inconsistent with pivoting leaf sheet (22)；Inferior lobe lamella (3) are stirred
Blade is mixed to include the main stirring blade (31) radially fixed with drilling rod (1) and be fixed on main stirring blade (31) both ends downward
Auxiliary stirring blade (32)；It is equipped in the main stirring blade (31) and auxiliary stirring blade (32) with longitudinal slip casting channel (11) even
The defeated slurry channel (33) of logical radial direction；It has opened towards drilling rod at defeated slurry channel (33) both ends of radial direction in the auxiliary stirring blade (32)
(1) mouth spray II (34).
2. variable diameters cement mixer drill bit according to claim 1, it is characterised in that: the drilling rod (1) includes mutual
Interior drilling rod (14) and outer drilling rod (15) nested and be threadedly coupled；Interior drilling rod (14) length is greater than outer drilling rod (15) length；
Setting longitudinal slip casting channel (11) inside the interior drilling rod (14)；The outer drilling rod (15) is socketed on interior drilling rod (14)
Section；The main lobe sheet (21) is welded on outer drilling rod (15) outer ring；The main stirring blade (31) is welded on interior drilling rod (14) outside
Circle；The drilling rod (1) can drive under the driving of external motor carries out forward and reverse rotation.
3. variable diameters cement mixer drill bit according to claim 2, it is characterised in that: pivoting leaf sheet (22) packet
Include the upper plate (223) and lower plate (224) for being arranged in parallel in main lobe sheet (21) upper and lower surface；The upper plate and lower plate are far from drilling rod
Connection closed at one end form the closed ends (221) of pivoting leaf sheet (22), the other end is open end (222)；The open end
(222) be socketed in main lobe sheet (21) upper and lower surface and fixed by a rivet (24) so that pivoting leaf sheet (22) and
Main lobe sheet (21) rotation connection；It is fixedly connected on the side wall of the closed end (221) and open end (222) and is parallel to bore
Longitudinal auxiliary cone tooth (25) of bar (1).
4. variable diameters cement mixer drill bit according to claim 3, it is characterised in that: the main lobe sheet (21) and rotation
Rotating vane sheet (22) vertical view is seen as S-shaped strip；The blade that the main lobe sheet (21) and pivoting leaf sheet (22) are composed
15 °~20 ° of the blade drift angle of layer (2)；25 °~30 ° of main stirring blade (31) the S-shaped circumferential direction drift angle.
5. variable diameters cement mixer drill bit according to claim 4, it is characterised in that: upper leaf lamella (2) is by boring
Bar (1) up to being arranged with two layers；The upper and lower structures of upper leaf lamella (2) are identical；The inferior lobe lamella (3) is by drilling rod
(1) supreme under to be provided with two layers；The upper and lower structures of the inferior lobe lamella (3) are identical；Four layers be fixed on drilling rod (1) stir
It mixes blade and mutually staggers angle, and then realize that the foundation soil stirring of multi-angle is broken.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821405315.4U CN208870028U (en) | 2018-08-29 | 2018-08-29 | A kind of variable diameters cement mixer drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821405315.4U CN208870028U (en) | 2018-08-29 | 2018-08-29 | A kind of variable diameters cement mixer drill bit |
Publications (1)
| Publication Number | Publication Date |
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| CN208870028U true CN208870028U (en) | 2019-05-17 |
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ID=66466082
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821405315.4U Active CN208870028U (en) | 2018-08-29 | 2018-08-29 | A kind of variable diameters cement mixer drill bit |
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| CN (1) | CN208870028U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530454A (en) * | 2021-07-17 | 2021-10-22 | 无锡市政建设集团有限公司 | Drilling rod for cement mixing pile |
-
2018
- 2018-08-29 CN CN201821405315.4U patent/CN208870028U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113530454A (en) * | 2021-07-17 | 2021-10-22 | 无锡市政建设集团有限公司 | Drilling rod for cement mixing pile |
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