CN114193592B - Precast concrete mould of accurate positioning - Google Patents
Precast concrete mould of accurate positioning Download PDFInfo
- Publication number
- CN114193592B CN114193592B CN202111612430.5A CN202111612430A CN114193592B CN 114193592 B CN114193592 B CN 114193592B CN 202111612430 A CN202111612430 A CN 202111612430A CN 114193592 B CN114193592 B CN 114193592B
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- positioning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/02—Moulds with adjustable parts specially for modifying at will the dimensions or form of the moulded article
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
- B28B7/0014—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0097—Press moulds; Press-mould and press-ram assemblies
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
- Moulds, Cores, Or Mandrels (AREA)
Abstract
The invention discloses a precast concrete mould capable of accurately positioning, which belongs to the technical field of precast concrete moulds and comprises trusses fixed on two sides of a base, wherein connecting frames are arranged at the tops of the trusses, positioning plates are connected between the connecting frames on two sides, a plurality of positioning grooves are uniformly distributed on the positioning plates, a pressing mechanism is arranged in each positioning groove and comprises a frame body, a positioning assembly, a fixing assembly and a pressing rotary handle, the fixing assembly is connected to the upper part of an inner cavity of the frame body, the positioning assembly is connected to the lower part of the fixing assembly, the pressing rotary handle is in threaded connection with the upper part of the fixing assembly, and the pressing rotary handle controls the fixing assembly and the positioning assembly to be fixed and pressed simultaneously. The novel die positioning and fixing device has the advantages that the positioning and fixing range of the preformed hole dies at different positions on the die frame is improved, the novel die positioning and fixing device is novel in design and convenient to install and detach, the preformed hole dies are quickly fixed through the positioning assembly, meanwhile, the quick assembly and disassembly of the pressing mechanism are realized through the fixing assembly, and the efficiency of positioning the preformed hole dies is saved.
Description
Technical Field
The invention relates to the technical field of precast concrete dies, in particular to a precast concrete die capable of being accurately positioned.
Background
Precast concrete units are often used in fabricated buildings, including precast beams, precast slabs, precast columns, precast floors and the like, and can be generally mass-produced on a large scale, so that the concrete pouring amount at a construction site is reduced, and the precast concrete units are widely used in modern buildings.
In the precast concrete pouring process, a preformed hole or a groove is needed on the precast member and used for penetrating an object, and a die adopted in the pouring process is placed at a position where the preformed hole or the groove needs to be reserved at present for pouring, so that accurate positioning is needed, but in the use process, when the die moves, the preformed hole or the groove can be offset, and the preformed hole and the groove can not be normally reserved.
Most of the prior art is to fix the reserved mould by manual work or pressed objects, but the limitation exists, the reserved mould can be fixed in a smaller range, and when different positions of the prefabricated part are required to be reserved, adjustment equipment is required, so that the operation is very complicated.
In view of the above-described related art, the present invention provides a precast concrete die that is precisely positioned.
Disclosure of Invention
In order to solve the problems that in the prior art, the reserved mould is fixed by manpower or pressed objects, but the reserved mould has limitation, the reserved mould can be fixed in a smaller range, adjustment equipment is needed when different positions of the prefabricated part are reserved, and the operation is very complicated, the invention provides the prefabricated concrete mould which is positioned accurately.
The invention provides a precast concrete die with accurate positioning, which adopts the following technical scheme: the precast concrete mould comprises a base, a mould frame arranged on the base, trusses fixed on two sides of the base, a connecting frame arranged at the top of the trusses, positioning plates connected between the connecting frames on two sides, a plurality of positioning grooves uniformly distributed on the positioning plates, a pressing mechanism arranged in the positioning grooves,
the pressing mechanism comprises a frame body, a positioning assembly, a fixing assembly and a pressing rotary handle, wherein the fixing assembly is connected to the upper portion of an inner cavity of the frame body, the positioning assembly is connected to the lower portion of the fixing assembly, the pressing rotary handle is in threaded connection with the upper portion of the fixing assembly, and the pressing rotary handle controls the fixing assembly and the positioning assembly to fix and press simultaneously.
Optionally, the fixed subassembly including connect in the initiative wedge of suppression spiral handle bottom, the both sides sliding connection of support body has driven wedge, both sides driven wedge keeps away from mutually one side all is equipped with the fixed column, initiative wedge is connected in two sets of between the driven wedge.
By adopting the technical scheme, the fixing of the pressing mechanism is realized.
Optionally, the contact surface of the driving wedge block and the driven wedge block is an inclined surface, a rotating hole is formed in the top of the fixing assembly, and the bottom end of the pressing rotating handle is rotationally connected in the rotating hole.
By adopting the technical scheme, the pressing rotary handle pulls or pushes the driving wedge block to move in the rotating process.
Optionally, the locating component is including connecting in the first fixed block of support body bottom, the bottom of first fixed block is connected with the second fixed block, the inner chamber of first fixed block runs through there is the reference column, the inner chamber both sides rotation of second fixed block are connected with the locating claw pole, both sides the locating claw pole keeps away from one side mutually all is equipped with the spring that is connected with the second fixed block inner wall, the top of locating claw pole is equipped with the butt wheel with the laminating of reference column outer wall.
Through adopting above-mentioned technical scheme, the rotation of abutting wheel is rotatory with the axle that locating claw pole and second fixed block are connected as the centre of a circle, and the effect of spring is guaranteed that abutting wheel can always contact with the butt inclined plane.
Optionally, an abutment inclined plane contacting with the abutment wheel is arranged on the outer side of the positioning column.
Through adopting above-mentioned technical scheme, when the reference column reciprocates, can drive the butt wheel of both sides and carry out the direction that is close to mutually or keeps away from mutually and rotate.
Optionally, the reference column is integrated into one piece structure with initiative wedge, the bottom of reference column is equipped with the top surface chuck, two sets of the locating claw pole bottom is close to a side mutually and is equipped with the side chuck.
Through adopting above-mentioned technical scheme, realize the multiaspect fixed to preformed hole mould, reduce preformed hole mould position offset.
Optionally, the locating plate includes the location mainboard, a plurality of location splice plates have been connected gradually through splice assembly to the both sides of location mainboard.
Through adopting above-mentioned technical scheme, can increase the location splice plate according to the size of mould frame.
Optionally, the splice assembly is including seting up in the guiding hole of locating motherboard both sides inner chamber, open on one side of guiding hole has and extend to the outside locating hole of locating motherboard, the location splice plate with the lateral wall both ends that the locating motherboard is connected are equipped with the guide post respectively, one side of guide post is equipped with the spring pin with locating hole looks adaptation.
Through adopting above-mentioned technical scheme, realize that location splice plate is connected or two adjacent location splice plates are connected with the location mainboard.
Optionally, the inner chamber lateral wall of connecting frame is opened there is the slide rail, location mainboard sliding connection is in two sets of between the slide rail, the top of connecting frame is run through there is fixing bolt, fixing bolt's bottom with the surface butt of location mainboard.
Through adopting above-mentioned technical scheme, can fix a position fixed to this preformed hole mould through adjusting the location mainboard, improved the preformed hole mould location fixed range to the different positions on the mould frame greatly.
Optionally, the positioning groove comprises a mounting hole, and fixing holes connected with the fixing component are formed in two sides of the mounting hole.
Through adopting above-mentioned technical scheme, the mounting hole provides the space of pressing mechanism installation, and the fixed orifices is then connected when needs fixed to the fixed subassembly on the pressing mechanism.
In summary, the present invention includes at least one of the following beneficial effects:
1. according to the invention, the positioning plate is adopted, the plurality of positioning grooves are uniformly distributed on the positioning plate, the pressing mechanism 7 can be arranged in the corresponding positioning groove above according to the position of the preformed hole die, and meanwhile, the position of the positioning plate can be self-adjusted, so that the positioning and fixing range of the preformed hole die at different positions on the die frame is greatly improved.
2. The compressing mechanism is novel in design, convenient to install and detach and convenient to operate, the preformed hole die is fast fixed through the locating component, meanwhile, fast loading and unloading of the compressing mechanism are realized through the fixing component, and the efficiency of locating the preformed hole die is saved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of the structure of the pressing mechanism of the present invention;
FIG. 3 is a schematic view of a positioning plate structure according to the present invention;
FIG. 4 is a schematic view of a splice assembly of the present invention;
fig. 5 is an enlarged schematic view of the portion a of the present invention.
Reference numerals illustrate: 1. a base; 2. a mold frame; 3. truss; 4. a connection frame; 41. a slide rail; 42. a fixing bolt; 5. a positioning plate; 51. positioning a main board; 511. a guide hole; 512. positioning holes; 52. positioning splice plates; 521. a guide post; 522. a spring pin; 6. a positioning groove; 61. a mounting hole; 62. a fixing hole; 7. a compressing mechanism; 71. a frame body; 72. a positioning assembly; 721. a first fixed block; 722. a second fixed block; 723. positioning columns; 724. a positioning claw rod; 725. a spring; 726. an abutment wheel; 727. abutting the inclined plane; 728. a side chuck; 729. a top chuck; 73. a fixing assembly; 731. an active wedge; 732. a driven wedge; 733. fixing the column; 74. pressing the rotary handle.
Detailed Description
The invention is described in further detail below with reference to fig. 1-5.
The invention discloses a precast concrete mould with accurate positioning, which comprises a base 1 and a mould frame 2 arranged on the base 1, wherein a precast slab is poured in the mould frame 2, when a preformed hole or a groove is formed on the precast slab, a preformed hole or a groove mould is required to be placed on the base 1, and the lower end of the mould is abutted on the base 1.
The device is characterized by further comprising trusses 3 fixed on two sides of the base 1, wherein the top of the trusses 3 is provided with connecting frames 4, the trusses 3 are used as supporting pieces of the connecting frames 4, the height of the trusses can be determined according to the length of a conventional preformed hole or a groove die, positioning plates 5 are connected between the connecting frames 4 on two sides, the positioning plates 5 can be connected to the connecting frames 4 to ensure the stability of the positioning plates 5, the device is convenient to install, a plurality of positioning grooves 6 are uniformly distributed on the positioning plates 5, a pressing mechanism 7 is arranged in each positioning groove 6, the pressing mechanism 7 is arranged above the position, needing the preformed hole, of the die frame 2 by arranging the positioning grooves 6 on the positioning plates 5, the pressing mechanism 7 can be arranged in the corresponding positioning groove 6 above the position of the preformed hole die according to the position of the preformed hole die, and the positioning of the preformed hole die is realized through the pressing mechanism 7, and the position offset of the preformed hole die is reduced;
the hold-down mechanism 7 includes support body 71, locating component 72, fixed subassembly 73 and suppression spiral handle 74, fixed subassembly 73 is connected in the inner chamber upper portion of support body 71, locating component 72 is connected in the below of fixed subassembly 73, suppression spiral handle 74 spiro union is in the top of fixed subassembly 73, suppression spiral handle 74 control fixed subassembly 73 and locating component 72 are fixed simultaneously and compress tightly, after corresponding the placing of hold-down mechanism 7 in constant head tank 6, through rotatory suppression spiral handle 74, can fix hold-down mechanism 7, the locating component 72 is fixed the location to the preformed hole mould in the time, improve positioning efficiency, convenient operation.
Referring to fig. 2, the fixing assembly 73 includes a driving wedge 731 connected to the bottom end of the pressing rotary handle 74, two sides of the frame 71 are slidably connected with driven wedge 732, one side of the driven wedge 732 at the two sides is provided with fixing columns 733, the driving wedge 731 is connected between the two sets of driven wedge 732, the driving wedge 731 is driven to move down by rotating the pressing rotary handle 74, the driving wedge 731 is matched with the driven wedge 732 in the downward moving process, and the driven wedge 732 at the two sides moves at the two sides, so that the fixing columns 733 extend into the fixing holes 62 in the positioning slots 6, thereby fixing the pressing mechanism 7.
The contact surface of the driving wedge 731 and the driven wedge 732 is an inclined surface, the top of the fixing component 73 is provided with a rotating hole, the bottom end of the pressing rotary handle 74 is rotationally connected in the rotating hole, the inclined surface design is adopted, the driven wedge 732 on two sides can be driven to move away from the horizontal in the downward moving process of the driving wedge 731, and the design of the rotating hole enables the pressing rotary handle 74 to pull or push the driving wedge 731 to move in the rotating process.
The positioning component 72 comprises a first fixed block 721 connected to the bottom of the frame 71, a second fixed block 722 is connected to the bottom of the first fixed block 721, the first fixed block 721 is used for limiting a positioning column 723, meanwhile, the second fixed block 722 is used for being fixedly supported by the second fixed block 722, a positioning claw rod 724 is installed on the second fixed block 722, a positioning column 723 penetrates through an inner cavity of the first fixed block 721, the positioning column 723 can move stably up and down in the first fixed block 721, positioning claw rods 724 are rotatably connected to two sides of the inner cavity of the second fixed block 722, springs 725 connected to the inner wall of the second fixed block 722 are arranged on two sides of the positioning claw rods 724, abutting wheels 726 attached to the outer wall of the positioning column 723 are arranged on the top end of the positioning claw rods 724, abutting faces contacting with the abutting wheels 727 are arranged on the outer sides of the positioning column 723, and abutting faces contacting the abutting wheels 726 are provided with abutting faces 727 due to the abutting faces of the abutting wheels 723, when the positioning column 723 moves up and down, the abutting wheels 726 can be driven to rotate in directions of approaching or moving away from each other, the abutting wheels 726 are rotatably connected to the abutting wheels 726 through the abutting wheels 724, and the abutting wheels 727 can be in contact with the abutting faces of the abutting wheels 727, and the abutting wheels 727.
The locating column 723 and the initiative wedge 731 are of an integrated structure, quick installation can be achieved, the structural design is novel, synchronous movement of the locating column 723 and the initiative wedge 731 is guaranteed, a top surface chuck 729 is arranged at the bottom end of the locating column 723, side chucks 728 are arranged at the bottom ends of two groups of locating claw rods 724 and close to one side, the top surface chuck 729 at the bottom end of the locating column 723 is close to the top surface of a preformed hole die in the downward movement process of the locating column 723, and meanwhile the side chucks 728 on the two groups of locating claw rods 724 are also close to the side surface of the preformed hole die, multi-surface fixation of the preformed hole die is achieved, and position offset of the preformed hole die is reduced.
Referring to fig. 3 and 4, the positioning board 5 includes a positioning main board 51, two sides of the positioning main board 51 are sequentially connected with a plurality of positioning splice plates 52 through a splicing assembly, the positioning splice plates 52 can be connected to the positioning main board 51 through the splicing assembly, and meanwhile, the positioning splice plates 52 can be increased according to the size of the mold frame 2, and two adjacent positioning splice plates 52 are also connected through the splicing assembly.
The splicing assembly comprises guide holes 511 formed in inner cavities at two sides of a positioning main board 51, one side of each guide hole 511 is provided with a positioning hole 512 extending to the outside of the positioning main board 51, two ends of a side wall, connected with the positioning main board 51, of each positioning splice board 52 are respectively provided with a guide post 521, one side of each guide post 521 is provided with a spring pin 522 matched with each positioning hole 512, the guide posts 521 arranged on the positioning splice boards 52 are positioned in the guide holes 511, the spring pins 522 are compressed into the guide posts 521, and when moving to the positioning holes 512, the spring pins pop out of the positioning holes 512 to realize connection between the positioning splice boards 52 and the positioning main board 51 or connection between two adjacent positioning splice boards 52.
Referring to fig. 3, slide rail 41 is opened to the inner chamber lateral wall of connecting frame 4, location mainboard 51 sliding connection is between two sets of slide rails 41, the top of connecting frame 4 runs through and has fixing bolt 42, fixing bolt 42's bottom and the surface butt of location mainboard 51, can be with the stable fixing of location mainboard 51 between connecting frame 4 through fixing bolt 42, location mainboard 51 can carry out the position control in a certain distance in can slide rail 41, effectively avoid there is the distance between the pressing mechanism 7 of horizontal direction to set up the preformed hole mould and can not fix a position fixed problem to it, when preformed hole mould is between pressing mechanism 7, can fix a position fixed range to this preformed hole mould through adjusting location mainboard 51, the preformed hole mould location fixed range of different positions on the mould frame 2 has been improved greatly.
Referring to fig. 5, the positioning groove 6 includes a mounting hole 61, two sides of the mounting hole 61 are provided with fixing holes 62 connected with fixing components 73, the mounting hole 61 provides a space for mounting the pressing mechanism 7, and the fixing holes 62 are used for connecting the fixing components 73 on the pressing mechanism 7 when the fixing is needed.
The implementation working principle of the precisely positioned precast concrete die provided by the invention is as follows:
when the preformed hole mould is required to be positioned at a plurality of different positions on the precast slab, the truss 3 is fixed on the base 1, then the positioning slab 5 is fixed on the connecting frame 4, the pressing mechanism 7 can be arranged above the position, needing the preformed hole, of the mould frame 2 by arranging a plurality of positioning grooves 6 on the positioning slab 5, the pressing mechanism 7 can be arranged in the corresponding positioning groove 6 above according to the position of the preformed hole mould, meanwhile, the position of the positioning slab 5 can be self-regulated, the positioning of the preformed hole mould is realized through the pressing mechanism 7, and the position offset of the preformed hole mould is reduced;
the hold-down mechanism 7 is novel in design, convenient to install and detach, and convenient to operate, only needs to position the position and the quantity of the preformed hole mould as required, then places the hold-down mechanism 7 in the constant head tank 6 of corresponding top, only needs to rotate the pressing rotary handle 74, fixes the preformed hole mould of below through the locating component 72, reduces preformed hole mould position offset, simultaneously, realizes the fixing of hold-down mechanism 7 through the fixed subassembly 73 to realize the accurate positioning to the preformed hole mould.
The above embodiments are not intended to limit the scope of the present invention, so: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (5)
1. The utility model provides a precast concrete mould of accurate positioning, includes base (1) and set up in mould frame (2) on base (1), its characterized in that: the device also comprises trusses (3) fixed on two sides of the base (1), the top of the trusses (3) is provided with connecting frames (4), positioning plates (5) are connected between the connecting frames (4) on two sides, a plurality of positioning grooves (6) are uniformly distributed on the positioning plates (5), a pressing mechanism (7) is arranged in each positioning groove (6),
the pressing mechanism (7) comprises a frame body (71), a positioning assembly (72), a fixing assembly (73) and a pressing rotary handle (74), wherein the fixing assembly (73) is connected to the upper portion of an inner cavity of the frame body (71), the positioning assembly (72) is connected to the lower portion of the fixing assembly (73), the pressing rotary handle (74) is in threaded connection with the upper portion of the fixing assembly (73), and the pressing rotary handle (74) controls the fixing assembly (73) and the positioning assembly (72) to be simultaneously fixed and pressed;
the fixing assembly (73) comprises a driving wedge block (731) connected to the bottom end of the pressing rotary handle (74), driven wedge blocks (732) are slidably connected to two sides of the frame body (71), fixing columns (733) are arranged on one sides, away from each other, of the driven wedge blocks (732), and the driving wedge block (731) is connected between the two groups of driven wedge blocks (732); the contact surface of the driving wedge block (731) and the driven wedge block (732) is an inclined surface, a rotating hole is formed in the top of the fixed assembly (73), and the bottom end of the pressing rotating handle (74) is rotationally connected in the rotating hole;
the positioning assembly (72) comprises a first fixed block (721) connected to the bottom of the frame body (71), a second fixed block (722) is connected to the bottom of the first fixed block (721), a positioning column (723) penetrates through an inner cavity of the first fixed block (721), positioning claw rods (724) are rotatably connected to two sides of the inner cavity of the second fixed block (722), springs (725) connected with the inner wall of the second fixed block (722) are arranged on two sides of the positioning claw rods (724) away from one another, and abutting wheels (726) attached to the outer wall of the positioning column (723) are arranged at the top end of the positioning claw rods (724); an abutting inclined surface (727) which is contacted with an abutting wheel (726) is arranged on the outer side of the positioning column (723); the positioning column (723) and the driving wedge block (731) are of an integrated structure, a top chuck (729) is arranged at the bottom end of the positioning column (723), and side chucks (728) are arranged at the bottom ends of the two groups of positioning claw rods (724) close to one side.
2. A precisely positioned precast concrete die as defined in claim 1, wherein: the locating plate (5) comprises a locating main plate (51), and a plurality of locating splice plates (52) are sequentially connected to two sides of the locating main plate (51) through splicing components.
3. A precisely positioned precast concrete die as defined in claim 2, wherein: the splicing assembly comprises guide holes (511) formed in inner cavities at two sides of a positioning main board (51), one side of each guide hole (511) is provided with a positioning hole (512) extending to the outside of the positioning main board (51), two ends of the side wall, connected with the positioning main board (51), of each positioning splicing board (52) are respectively provided with a guide column (521), and one side of each guide column (521) is provided with a spring pin (522) matched with each positioning hole (512).
4. A precisely positioned precast concrete die as defined in claim 2, wherein: the inner cavity side wall of the connecting frame (4) is provided with a sliding rail (41), the positioning main board (51) is connected between the two groups of sliding rails (41) in a sliding mode, the top of the connecting frame (4) is penetrated with a fixing bolt (42), and the bottom end of the fixing bolt (42) is abutted to the surface of the positioning main board (51).
5. A precisely positioned precast concrete die as defined in claim 1, wherein: the positioning groove (6) comprises a mounting hole (61), and fixing holes (62) connected with the fixing assembly (73) are formed in two sides of the mounting hole (61).
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CN202111612430.5A CN114193592B (en) | 2021-12-27 | 2021-12-27 | Precast concrete mould of accurate positioning |
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CN202111612430.5A CN114193592B (en) | 2021-12-27 | 2021-12-27 | Precast concrete mould of accurate positioning |
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CN114193592A CN114193592A (en) | 2022-03-18 |
CN114193592B true CN114193592B (en) | 2023-07-04 |
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CN100410477C (en) * | 2004-06-03 | 2008-08-13 | 奇美实业股份有限公司 | Forming apparatus and constructing metho (1) for concrete floorslab futuring aperturing |
CN205146671U (en) * | 2015-11-20 | 2016-04-13 | 玉溪大红山矿业有限公司 | Linear sieve compresses tightly fixing device |
CN206883880U (en) * | 2017-05-18 | 2018-01-16 | 广东信强混凝土有限公司 | A maintenance frame for standard curing room |
CN109680940A (en) * | 2019-02-01 | 2019-04-26 | 山西三建集团有限公司 | Preserved pipeline passes through the pre-embedded device and built-in process in hole in floor concrete casting |
US11384548B2 (en) * | 2019-04-12 | 2022-07-12 | DPR Construction | Sleeve for concrete slab penetration |
CN213198095U (en) * | 2020-07-25 | 2021-05-14 | 河南正兴工程管理有限公司 | Precast concrete mould of accurate positioning |
CN212838793U (en) * | 2020-08-18 | 2021-03-30 | 宁奇韬 | Concatenation formula polyurethane heated board |
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