CN209145296U - A kind of installation lifting device for material distributing machine - Google Patents
A kind of installation lifting device for material distributing machine Download PDFInfo
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- CN209145296U CN209145296U CN201821756156.2U CN201821756156U CN209145296U CN 209145296 U CN209145296 U CN 209145296U CN 201821756156 U CN201821756156 U CN 201821756156U CN 209145296 U CN209145296 U CN 209145296U
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Abstract
The utility model is used for the installation lifting device of material distributing machine, lifting device is installed, including cloth machine base, Central Standard section, top standard knot, cloth machine base includes two pieces of bottom plates, backing plate is connected under two pieces of bottom plates, every piece of plate upper surface, which is respectively perpendicular, is connected with two pedestal upright bars, and pedestal upright bar constitutes a rectangle, and every pedestal upright bar upper end, which is equipped with, to be reinforced to female connector I.Central Standard section includes four middle part upright bars, and the position of four middle part upright bars is corresponded to each other with the position of four pedestal upright bars, and every middle part upright bar lower end, which is equipped with, to be reinforced to female connector II, and every middle part upright bar upper end, which is equipped with, to be reinforced to female connector III.Top standard knot includes four top upright bars and rotating arm mounting base, the position of four top upright bars is corresponded to each other with the position of four middle part upright bars, every top upright bar lower end, which is equipped with, to be reinforced to female connector IV, and cloth machine base, Central Standard section, top standard knot are sequentially connected and are locked by bolt and nut.
Description
Technical field
The utility model relates to technical field of building construction, in particular to a kind of installation lifting device for material distributing machine.
Background technique
Currently, generalling use four foot concrete spreaders, being added in flooring in architectural engineering floor concrete pours
Gu installation is complicated cumbersome, foot support system is not only added at material distributing machine support leg, also need that floor steel bars binding is waited to check and accept
It could be installed after, delay the concreting time, it is the stability of material distributing machine installation, rapidity, in-advance, after directly affecting
Continuous work progress.Specific shortcoming is as follows: 1, material distributing machine cannot shift to an earlier date or install simultaneously with other processes, it is necessary to floor steel
Muscle binding could install after the completion of checking and accepting, and delay the concreting time；2, during pouring, material distributing machine is in concrete
Shaken in pumping procedure it is larger, generate horizontal thrust, certain vibration is generated to flooring total system, influences floor concrete
Solidification and floor concrete structural behaviour；3, complex procedures after the completion of pouring, also will affect the work of receipts face, it is necessary to first dismantle
Material distributing machine, the concrete surface that could complete cloth motor spindle receive face work, increase working time and labour.
Summary of the invention
The purpose of this utility model is in view of the deficiency of the prior art, to provide a kind of installation for material distributing machine
Lifting device, lifting device structure safety and firmness are promoted in place, and easy to operate, improve construction efficiency, are saved artificial
And mechanical one-shift.
The utility model to achieve the above object the technical solution adopted is that: a kind of installation for material distributing machine promotes dress
Set, including sequentially connected cloth machine base, Central Standard section, top standard knot, cloth machine base include two pieces of bottom plates, two pieces
The both ends bottom of bottom plate is connected separately with the backing plate big compared with baseplate width, and backing plate is equipped with installation through-hole, every piece of plate upper surface
It is respectively perpendicular and is connected with two pedestal upright bars, the pedestal upright bar position on two pieces of plate upper surfaces corresponds to each other so that four pedestals
Upright bar constitutes a rectangle, and pedestal bracing boom is connected between pedestal upright bar, is connected with reinforcing on the outside of every pedestal upright bar upper end
To female connector I, Central Standard section includes four middle part upright bars, the position of upright bar and the position phase of four pedestal upright bars in the middle part of in the of four
It mutually corresponds and also surrounds rectangle, middle part bracing boom is connected between adjacent middle part upright bar, every middle part upright bar lower end outside connects
It is connected to the reinforcing of pedestal upright bar reinforcing mutual corresponding to I position of female connector to female connector II, every middle part connects on the outside of upright bar upper end
Reinforcing is connected to female connector III, top standard knot includes four top upright bars and the rotating arm peace for being connected to four top rod ends
Bottom plate is filled, the position of upright bar and the position of four middle part upright bars mutually correspond and also surround rectangle at the top of four, adjacent top
Top bracing boom is connected between upright bar, every top upright bar lower end outside is connected with the reinforcing with middle part upright bar upper end to female connector
The mutual corresponding reinforcing in III position is to female connector IV, when cloth machine base, Central Standard section, top standard knot are sequentially connected, middle part
The reinforcing of standard knot lower end is mutually butted the reinforcing of female connector II and pedestal upright bar upper end to female connector I and is locked by bolt and nut
Tightly, the reinforcing of Central Standard section upper end is mutually butted the reinforcing of female connector III and top standard knot lower end to female connector IV and passes through spiral shell
Bolt nut check.
The further technical solution of the utility model is: a plurality of pedestal bracing boom is vertically connected on pedestal adjacent on bottom plate
Between upright bar.
The further technical solution of the utility model is: the middle part bracing boom includes being vertically connected on adjacent middle part upright bar
Between horizontal middle bracing boom and inclination be connected to slanted midportion bracing boom between adjacent middle part upright bar.
The further technical solution of the utility model is: the top bracing boom includes being vertically connected on adjacent top upright bar
Between horizontal top bracing boom and inclination be connected to angled top bracing boom between adjacent top upright bar.
The further technical solution of the utility model is: the bottom plate of the cloth machine base is I-steel, and backing plate is circle
Backing plate.
The further technical solution of the utility model is: welding between the bottom plate and pedestal upright bar bottom end of the cloth machine base
It is connected to triangle stiffener.
Installation lifting device of the utility model for material distributing machine has the following beneficial effects:
1, the utility model is for the installation lifting device of material distributing machine by cloth machine base, Central Standard section, top standard
Section is formed by connecting, the Central Standard section of visual story height selection different number, cloth machine base, Central Standard section, top mark
Quasi- section is fixed by bolt locking, nut, and Central Standard section, top standard knot can carry out promotion installation, structure in reserved opening
Simply, easy for installation；
2, cloth machine base is mounted on the second floor under floor to be onstructed by the utility model, can install cloth in advance
Machine avoids that concrete placings can be carried out at once after floor steel bar is checked and accepted with other work post cross-operation of flooring to be poured；It improves
Construction efficiency；
3, the setting of cloth machine base periphery is adjustable shores fixation, and Central Standard section is arranged fixed device in floor location and consolidates
Fixed, Central Standard section offsets with fixed device, and compared with the prior art, material distributing machine stability is more preferable, reduces material distributing machine and topples
Probability；
4, when cloth machine operation with flooring to be poured without directly contacting, avoid cloth machine base to cast-in-place walls reinforcing bar and pre-
The influence of Sunken wire tube, while reducing and generating horizontal thrust to the stabilization of flooring lower template support system because shaking when material distributing machine work
Property influence, eliminate such security risk；
5, material distributing machine is also not necessarily to withdraw immediately after having constructed, and can be promoted in tower crane work idle period to material distributing machine,
Such as a few set pedestals of polygamy system and standard knot, same material distributing machine can be used in each floor face cross-circulation, greatly improve material distributing machine
Utilization rate saves artificial and mechanical one-shift, reduces into construction cost.
The installation lifting device to the utility model for material distributing machine is made further with reference to the accompanying drawings and examples
It is bright.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the utility model for the cloth machine base of the installation lifting device of material distributing machine；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is structural schematic diagram of the utility model for the Central Standard section of the installation lifting device of material distributing machine；
Fig. 4 is structural schematic diagram of the utility model for the top standard knot of the installation lifting device of material distributing machine；
Fig. 5 is the structural schematic diagram in the side fixing device for installing of reserved opening；
Fig. 6 is the structural representation connecting when installation lifting device construction of the utility model for material distributing machine with material distributing machine
Figure；
Drawing reference numeral explanation: A- cloth machine base, B- Central Standard section, the top C- standard knot, the fixed device of D-, the bottom 1-
Plate, 2- backing plate, 3- pedestal bracing boom, 4- triangle stiffener, 5- pedestal upright bar, 6- are reinforced to female connector I, 7- installation through-hole, 8-
Middle part upright bar, 9- are reinforced to female connector III, 10- horizontal middle bracing boom, 11- slanted midportion bracing boom, and 12- is reinforced to female connector II,
13- is reinforced to female connector IV, 14- top upright bar, 15- horizontal top bracing boom, 16- angled top bracing boom, the installation of 17- rotating arm
Bottom plate, 18- fixation steel plate, 19- nut, 20- screw rod, 21- pipe thread, 22- pump line, 23- reserved opening, 24- is adjustable to be shored, 25-
N-2 floor face, 26-N-1 floor face, 27-N floor face, 28- hose, 29- material distributing machine counterweight, 30- material distributing machine rotating arm.
Specific embodiment
As shown in Figures 1 to 6, the utility model is used for the installation lifting device of material distributing machine, including sequentially connected cloth
Machine base A, Central Standard section B, top standard knot C, a set of installation lifting device need a set of cloth machine base A and a set of top
The quantity of standard knot C, Central Standard section B can select the Central Standard section B of different number according to story height.
As shown in Figure 1, 2, cloth machine base A include two pieces of bottom plates 1, the both ends bottom of two pieces of bottom plates 1 be connected separately with compared with
The big backing plate 2 of 1 width of bottom plate, the present embodiment insole board 1 are I-steel, and backing plate 2 is circular shim, and backing plate 2 can increase cloth
Machine base A contact area, backing plate 2 are equipped with installation through-hole 7, fix convenient for upper expansion bolt with flooring.Every piece of 1 upper surface of bottom plate
It is respectively perpendicular and is connected with two pedestal upright bars 5,5 use side of pedestal upright bar leads to steel pipe.Pedestal upright bar on two pieces of 1 upper surfaces of bottom plate
5 positions correspond to each other so that four pedestal upright bars 5 constitute a rectangles, are connected with pedestal bracing boom 3 between pedestal upright bar 5, more
Pedestal bracing boom 3 is vertically welded between pedestal upright bar 5 adjacent on bottom plate 1.It is connected on the outside of every 5 upper end of pedestal upright bar
It reinforces to female connector I 6.1 upper surface of bottom plate and pedestal upright bar are welded with triangle stiffener 4 between 5 bottom end.
As shown in figure 3, Central Standard section B includes four middle part upright bars 8, position and four pedestals of four middle part upright bars 8
The position of upright bar 5, which mutually corresponds, also surrounds rectangle, and middle part upright bar 8 leads to steel pipe production using side identical with pedestal upright bar 5
It is formed, middle part bracing boom is connected between adjacent middle part upright bar 8, every middle part 8 lower end outside of upright bar is connected with and pedestal upright bar 5
Reinforcing it is mutual corresponding to I 6 position of female connector reinforce to female connector II 12, every middle part is connected with reinforcing pair on the outside of 8 upper end of upright bar
Female connector III 9.The middle part bracing boom includes the horizontal middle bracing boom 10 being vertically welded between adjacent middle part upright bar 8 and inclination
It is connected to slanted midportion bracing boom 11 between adjacent middle part upright bar 8.The length of Central Standard section B can be 3m, certainly except in the middle part of 3m
Outside standard knot B, it can also be fabricated to the Central Standard section B of 1m or 2m, be applicable in the floor construction usage of different height.
As shown in figure 4, top standard knot C includes four top upright bars 14 and the rotation for being connected to four tops, 14 top of upright bar
The position of pivoted arm mounting base 17, the position of four top upright bars 14 and four middle part upright bars 8, which mutually corresponds, also surrounds square
Shape, top upright bar 14 lead to steel pipe using side identical with pedestal upright bar 5 and make to be formed, and top is connected between adjacent top upright bar 14
Portion's bracing boom, it is mutually right to III 9 position of female connector with the reinforcing of 8 upper end of middle part upright bar that every top 14 lower end outside of upright bar is connected with
The reinforcing answered is to female connector IV 13.The length of top standard knot C can be 1m.The top bracing boom includes being vertically welded in adjacent top
Horizontal top bracing boom 15 and inclination between portion's upright bar 14 are connected to the angled top bracing boom between adjacent top upright bar 14
16.One external tooth material distributing machine turntable bearing is set among rotating arm mounting base 17, and the intermediate circular hole of rotating arm mounting base 17 is straight
Diameter is identical as bearing outer ring diameter of bore, and bearing outer ring is connected and fixed with rotating arm mounting base 17, bearing inner race and material distributing machine
Rotating arm 30 is connected and fixed.Jib structure is guided just to be able to achieve 360 ° of top frame body revolutions by traction rope.
When cloth machine base A, Central Standard section B, top standard knot C are sequentially connected, the reinforcing pair of the lower end Central Standard section B
The reinforcing of female connector II 12 and 5 upper end of pedestal upright bar is mutually butted female connector I 6 and is locked by bolt and nut, on Central Standard section B
The reinforcing at end is mutually butted the reinforcing of female connector III 9 and the lower end top standard knot C to female connector IV 13 and is locked by bolt and nut,
The quantity of Central Standard section B can select different number according to story height, when selecting multistage Central Standard section B, mark in the middle part of multistage
Quasi- section B is mutually butted, and is located at the lowermost Central Standard lower end section B and is connect with cloth machine base A, and the middle part positioned at the top is marked
The quasi- section upper end B is connect with the top bottom end standard knot C.
The application method of the above-mentioned installation lifting device for material distributing machine, please refers to Fig. 5, shown in 6, comprising the following steps:
(1) installation lifting device is determined before every floor casting according to the floor plan of material distributing machine more than Stall
The position of reserved opening 23 retains reserved opening 23 when being poured floor, reserved opening 23 is rectangle, and the size of reserved opening 23 is big
In the rectangle that tetra- middle part upright bars 8 of Central Standard section B surround, wherein material distributing machine need to be worked out before the installation of selected reserved opening 23
Plan for installation and construction, rendering enginer bit plane layout drawing are determined the indwelling position of reserved opening 23 by plan view.
(2) cloth machine base A is installed: floor to be poured is set as N floor face 27, wherein N is the integer more than or equal to 3,
Cloth machine base A is lain in a horizontal plane in into N-2 floor face 25, adjusts the flatness of backing plate 2 and bottom plate 1, so that four pedestals are vertical
The position for the rectangle alignment flooring reserved opening 23 that bar 5 is constituted, expansion bolt makes material distributing machine bottom on the installation through-hole 7 of backing plate 2
Seat A is fixed with flooring, and is returned back to top in the 2 corresponding position of flooring lower layer of support pad plate.
(3) Central Standard section B is installed: Central Standard section B being docked with cloth machine base A, in Central Standard section B tetra-
The reinforcing of 8 bottom end of portion's upright bar is mutually butted female connector II 12 and the reinforcing of four 5 upper ends of pedestal upright bar to female connector I 6, and by bolt
Nut locks reinforcing one by one, and Central Standard section B is made to keep vertical, is selected to install one or more snippets Central Standard according to story height
B is saved, when installing multistage Central Standard section B, adjacent Central Standard section B is mutually butted female connector and by corresponding reinforcing by spiral shell
Bolt nut check, Central Standard section B passes through 26 reserved opening 23 of N-1 floor face, until reaching designed elevation, in N-2 floor face
The cloth machine base A periphery of the 25 upper surfaces and setting of 26 lower surface of N-1 floor face is adjustable shores 24 makes adjustable to shore 24 and hang down below
It is directly supported on cloth machine base A, upper end jacking is securely shored to upper floor plate.
(4) 26 reserved opening of N-1 floor face, 23 side fixer D is installed: in N-1 floor face 26 reserved opening 23 with
Four pieces of end to end fixation steel plates 18 are installed, four pieces of fixation steel plates 18 are combined into fixation in the gap between Central Standard section B
Device D, every piece of fixation steel plate 18 are equipped at least two threaded holes, and threaded hole one end that screw rod 20 passes through fixation steel plate 18 is against
23 sidewall surfaces of reserved opening are used 19 tie down screw 20 of nut on the outside of fixation steel plate 18, are tightened by tools such as spanners, and four pieces solid
Determine 26 reserved opening of steel plate 18 and N-1 floor face, 23 side and be fixedly secured to hold out against, at this moment Central Standard section B is located at four blocks of fixed steel
It is reserved that N-1 floor face 26 will not be touched Central Standard section B offset on the inside of the rectangle frame that plate 18 surrounds, in work progress
The concrete of 23 side of hole.
(5) top standard knot C installation: top standard knot C is docked with the Central Standard section B for being located at the top, so that top
The ministerial standard lower end section C reinforces and is mutually butted to female connector IV 13 and the reinforcing of the top Central Standard section B to female connector III 9, and by spiral shell
Bolt nut check is fixed.
(6) material distributing machine rotating arm 30 and top standard knot C abutting joint: the rotating arm mounting base of standard knot C at top
Material distributing machine rotating arm 30 is installed on 17, material distributing machine counterweight 29 is installed in 30 one end of material distributing machine rotating arm, wherein in lifting rotating arm
When, it is necessary to find tower crane wirerope binding point accurately, lifting must keep rotating arm steady and arm body level, with top standard knot C
It after connecting, is reinforced using screw, material distributing machine counterweight 29 is finally installed.
(7) pump line 22, casting concrete are connected.When wherein connecting pump line 22, standpipe is conveyed from cloth using high pressure concrete
Material machine is connected to a laminate face, and material distributing machine connect with 22 anchor ear of pump line, adjacent anchor ear spacing 1.1m；Between pump line 22 and pump line 22
It is fastened using pipe thread, every layer of standpipe is both needed to set up that steel pipe frame blocks pipe thread and thick pillar is reinforced；At one layer of standpipe, external 90 ° of bend pipes,
Horizontal tube is connected to pump machine placement position again.In casting concrete, material distributing machine operator should be handed over, in rotation material distributing machine
When, it needs slowly at the uniform velocity, to be sure not to covet and stretch the meaning fastly, concrete vibrating pulls out method slowly using fast insert, by vibrating head quick insertion coagulation
Native bottom slowly can up mention vibrating head when concrete surface is not bubbled up but bursted and become muddy when a thaw sets in, finally extraction vibration
Stick.
The rotating arm and counterweight of material distributing machine are lifted by crane after the completion of pouring, separately cloth machine base A and Central Standard section B, then to
Upper promotion Central Standard section B and top standard knot C, Specific construction technique are as follows: first packing up material distributing machine rotating arm 30 before operation, unload
Lower material distributing machine tail balancing weight unclamps fixed device D and the adjustable of cloth machine base A periphery at N-1 floor plate and shores 24；And the bottom of by
Seat is unclamped with Central Standard section B attachment device, then first uses tower crane vertical-lift material distributing machine 10cm, cloth machine base A is torn open
It removes, after being transported to next level, then by material distributing machine fuselage and Central Standard section B and one layer of top standard knot C vertical-lift, that is, mentions
It is raised to N-1 floor face 26, reinstalls cloth machine base A in the floor face, and be connected and fixed with the bottom end Central Standard section B, is adjusted
Whole material distributing machine verticality, the setting of cloth machine base A periphery is adjustable to shore 24 and returns back to top fixation, installs reserved opening 23 in N floor plate
Side fixer D after material distributing machine installs tail balancing weight, can pour N+1 floor face, so recycle, successively promote cloth
Machine, which pours, smashes each floor surface concrete.
Above embodiments are only the preferred embodiment of the utility model, and the structure of the utility model is not limited to above-mentioned implementation
The form enumerated of example, any modification made within the spirit and principle of the present invention, equivalent replacement etc. should all include
It is within the protection scope of the utility model.
Claims (6)
1. a kind of installation lifting device for material distributing machine, which is characterized in that including sequentially connected cloth machine base (A), in
Ministerial standard section (B), top standard knot (C), cloth machine base (A) include two pieces of bottom plates (1), the both ends bottom of two pieces of bottom plates (1)
It is connected separately with the backing plate (2) big compared with bottom plate (1) width, backing plate (2) is equipped with installation through-hole (7), every piece of bottom plate (1) upper surface
It is respectively perpendicular and is connected with two pedestal upright bars (5), pedestal upright bar (5) position on two pieces of bottom plate (1) upper surfaces, which corresponds to each other, to be made
It obtains four pedestal upright bars (5) and constitutes a rectangles, be connected with pedestal bracing boom (3) between pedestal upright bar (5), every pedestal upright bar
(5) reinforcing is connected on the outside of upper end to female connector I (6), Central Standard section (B) includes four middle part upright bars (8), and four middle parts are vertical
The position of bar (8) and the position of four pedestal upright bars (5) mutually correspond and also surround rectangle, between adjacent middle part upright bar (8)
It is connected with middle part bracing boom, every middle part upright bar (8) lower end outside is connected with the reinforcing of pedestal upright bar (5) to female connector I (6) position
Mutual corresponding reinforcing is set to female connector II (12), every middle part upright bar (8) upper end outside is connected with reinforcing to female connector III (9), top
Ministerial standard section (C) includes four top upright bars (14) and the rotating arm mounting base for being connected to four tops upright bar (14) top
(17), the position of four top upright bars (14) and the position of four middle part upright bars (8) mutually correspond and also surround rectangle, adjacent
Top bracing boom is connected between top upright bar (14), every top upright bar (14) lower end outside is connected with and middle part upright bar (8)
The reinforcing of upper end reinforcing mutual corresponding to female connector III (9) position is to female connector IV (13), cloth machine base (A), Central Standard section
(B), when top standard knot (C) is sequentially connected, the reinforcing of the lower end Central Standard section (B) is to female connector II (12) and pedestal upright bar (5)
The reinforcing of upper end is mutually butted female connector I (6) and is locked by bolt and nut, and the reinforcing of the upper end Central Standard section (B) is to female connector
The reinforcing of III (9) and the lower end top standard knot (C) is mutually butted female connector IV (13) and is locked by bolt and nut.
2. being used for the installation lifting device of material distributing machine as described in claim 1, which is characterized in that a plurality of pedestal bracing boom (3)
It is vertically connected between pedestal upright bar (5) adjacent on bottom plate (1).
3. being used for the installation lifting device of material distributing machine as described in claim 1, which is characterized in that the middle part bracing boom includes
The horizontal middle bracing boom (10) and inclination being vertically connected between adjacent middle part upright bar (8) are connected to adjacent middle part upright bar (8)
Between slanted midportion bracing boom (11).
4. being used for the installation lifting device of material distributing machine as described in claim 1, which is characterized in that the top bracing boom includes
The horizontal top bracing boom (15) and inclination being vertically connected between adjacent top upright bar (14) are connected to adjacent top upright bar
(14) the angled top bracing boom (16) between.
5. being used for the installation lifting device of material distributing machine as described in claim 1, which is characterized in that the cloth machine base (A)
Bottom plate (1) be I-steel, backing plate (2) be circular shim (2).
6. being used for the installation lifting device of material distributing machine as described in claim 1, which is characterized in that the cloth machine base (A)
Bottom plate (1) and pedestal upright bar (5) bottom end between be welded with triangle stiffener (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821756156.2U CN209145296U (en) | 2018-10-27 | 2018-10-27 | A kind of installation lifting device for material distributing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821756156.2U CN209145296U (en) | 2018-10-27 | 2018-10-27 | A kind of installation lifting device for material distributing machine |
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| Publication Number | Publication Date |
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| CN209145296U true CN209145296U (en) | 2019-07-23 |
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ID=67271009
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821756156.2U Active CN209145296U (en) | 2018-10-27 | 2018-10-27 | A kind of installation lifting device for material distributing machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109235895A (en) * | 2018-10-27 | 2019-01-18 | 广西建工集团第三建筑工程有限责任公司 | A kind of installation lifting device and application method for material distributing machine |
| CN114704096A (en) * | 2022-03-18 | 2022-07-05 | 中建八局发展建设有限公司 | Climbing formula quick detach concrete spreader in pit shaft |
-
2018
- 2018-10-27 CN CN201821756156.2U patent/CN209145296U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109235895A (en) * | 2018-10-27 | 2019-01-18 | 广西建工集团第三建筑工程有限责任公司 | A kind of installation lifting device and application method for material distributing machine |
| CN114704096A (en) * | 2022-03-18 | 2022-07-05 | 中建八局发展建设有限公司 | Climbing formula quick detach concrete spreader in pit shaft |
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