CN110805276A - Self-pulling type preformed hole die - Google Patents
Self-pulling type preformed hole die Download PDFInfo
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- CN110805276A CN110805276A CN201910943621.6A CN201910943621A CN110805276A CN 110805276 A CN110805276 A CN 110805276A CN 201910943621 A CN201910943621 A CN 201910943621A CN 110805276 A CN110805276 A CN 110805276A
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- prefabricated
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
- E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys
- E04G15/063—Re-usable forms
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- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The invention provides a self-pulling type preformed hole die, which comprises: the prefabricated mould is of a hollow cylinder structure and is used for being inserted into a prefabricated plate template, so that a reserved hole is formed in the prefabricated plate after pouring forming; the fixed rod unit is inserted in the prefabricated mold, and the arrangement direction of the fixed rod unit is the same as that of the prefabricated mold; the adjusting rulers are uniformly arranged between the adjusting rulers and the inner side wall of the prefabricated mold, and the adjusting rulers are annularly arranged along the arrangement direction of the fixed rod unit; the plurality of adjusting rules are used for moving to adjust the distance between the fixing rod unit and the prefabricated mold. Set up the dead lever unit and fixed prefabricated mould to predetermined position, improved the structural stability who reserves the hole mould from the formula of drawing, simultaneously, still wholly demolish prefabricated mould through the dead lever unit, improved the efficiency of construction, can also prevent to lead to the fact destruction to the concrete structure when demolising prefabricated mould.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a self-pulling type reserved hole die.
Background
At present, in a building structure, a reserved hole is generally manufactured by using a PVC pipe mold, the PVC pipe mold is dismantled after cast-in-place, when the PVC pipe mold is dismantled, 30% of the PVC pipe mold can not be dismantled, because concrete hardening degrees are different, the PVC pipe mold is stuck with concrete, the PVC pipe mold can only be destroyed to finish the dismantling operation of the PVC pipe mold finally, when the PVC pipe mold is dismantled, the concrete structure of the building structure can be destroyed, the appearance quality of the concrete structure is influenced, the concrete structure needs to be repaired, the loss of raw materials is caused, and excessive construction waste is caused on site.
Disclosure of Invention
In view of this, the invention provides a self-pulling type reserved hole mold, which aims to solve the problem of damage to a concrete structure caused when a reserved hole in a building structure is constructed.
In one aspect, the present invention provides a self-pulling type pre-hole mold, including: the prefabricated mould is of a hollow cylinder structure and is used for being inserted into a prefabricated plate template, so that a reserved hole is formed in a prefabricated plate after pouring forming; the fixed rod unit is inserted in the prefabricated mold, and the arrangement direction of the fixed rod unit is the same as that of the prefabricated mold; the adjusting rulers are uniformly arranged between the adjusting rulers and the inner side wall of the prefabricated mold, and the adjusting rulers are annularly arranged along the arrangement direction of the fixed rod unit; the adjusting rules are used for moving to adjust the distance between the fixing rod unit and the prefabricated mould.
Further, the fixing rod unit comprises a screw rod and a nut, the screw rod is arranged along the arrangement direction of the prefabricated mold, and the nut is sleeved on the screw rod; the adjusting rulers are annularly arranged on the outer side wall of the nut.
Furthermore, a threaded pin shaft is arranged on the outer side wall of the nut, the threaded pin shaft is arranged along the arrangement direction of the adjusting ruler, and the end part of the adjusting ruler is connected with the threaded pin shaft through threads.
Furthermore, the self-pulling type reserved hole die further comprises a positioning unit, the positioning unit is the same as the fixing rod unit in arrangement direction and sleeved on the fixing rod unit, and the positioning unit is used for positioning the fixing rod unit.
Furthermore, the positioning unit comprises a positioning drill rod, an upper connecting plate and a lower connecting plate, and the positioning drill rod and the screw rod are arranged in the same direction and penetrate through the nut; the upper connecting plate and the lower connecting plate are arranged in parallel relatively and are perpendicular to the positioning drill rods, and the nuts are arranged between the upper connecting plate and the lower connecting plate.
Furthermore, the upper end of the positioning drill rod is connected with the upper connecting plate, and the lower end of the positioning drill rod is connected with the lower connecting plate.
Furthermore, the positioning drill rods are arranged in a plurality and are annularly arranged along the circumferential direction of the screw rod.
Furthermore, a plurality of first positioning holes are uniformly formed in the nut, the setting direction of the first positioning holes is the same as that of the positioning drill rods, and the first positioning holes are used for enabling the positioning drill rods to penetrate through.
Furthermore, a plurality of second positioning holes are formed in the lower connecting plate, the second positioning holes are arranged opposite to the first positioning holes, and the second positioning holes are used for enabling the end portions of the positioning drill rods to penetrate through.
Furthermore, a plurality of pin holes are formed in the lower connecting plate, and the pin holes and the second positioning holes are arranged in an alternating mode.
Furthermore, a positioning pin penetrates through the pin hole.
Further, the prefabricated mould comprises a prefabricated steel pipe mould and an inner support, the prefabricated steel pipe mould is of an annular structure, the inner support is laid on the inner side wall of the prefabricated steel pipe mould, and the inner support is detachably connected with the end portion of the adjusting ruler.
Compared with the prior art, the self-pulling type reserved hole die has the advantages that the reserved holes in a building structure are manufactured through the self-pulling type reserved hole die, a plurality of prefabricated dies are prefabricated according to the sizes of the reserved holes through the arrangement of the fixed rod units, the adjusting ruler and the prefabricated dies, the reserved holes with different sizes are manufactured through the same self-pulling type reserved hole die, and the application range of the self-pulling type reserved hole die is widened; meanwhile, the position of the prefabricated mould is adjusted by arranging the adjusting ruler, and the prefabricated mould is fixed by the adjusting ruler, so that the construction efficiency is greatly improved, and the self-pulling type reserved hole mould can be quickly installed and fixed; set up the dead lever unit and fixed prefabricated mould to predetermined position, improved the structural stability who reserves the hole mould from the formula of drawing, simultaneously, still wholly demolish prefabricated mould through the dead lever unit, improved the efficiency of construction, can also prevent to lead to the fact destruction to the concrete structure when demolising prefabricated mould.
Further, after the building structure formwork installation is completed, the self-pulling type reserved hole die is fixed on a preset position according to a drawing, the prefabricated die is fixed at the setting position of the reserved hole by adjusting the adjusting ruler, the self-pulling type reserved hole die can be pulled out after concrete pouring for one day, the self-pulling type reserved hole die can be pulled out by rotating the fixing rod unit, the device can be repeatedly used, construction waste is avoided, the production efficiency is high, the appearance quality of the concrete structure after construction is good, the device can adapt to reserved holes in different sizes, and the application range is wide.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a front view of a self-drawing hole-reserving mold according to an embodiment of the present invention;
fig. 2 is a top view of a self-pulling type pre-hole mold according to an embodiment of the present invention;
fig. 3 is a top view of a nut and a lower web provided by an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 and fig. 2, the present embodiment discloses a self-pulling type pre-hole mold, which includes: the prefabricated mould 3 is of a hollow cylinder structure and is used for being inserted into a prefabricated plate template, so that a prefabricated plate after pouring forming forms a reserved hole; the fixed rod unit is inserted in the prefabricated mold 3, and the arrangement direction of the fixed rod unit is the same as that of the prefabricated mold 3; the adjusting rulers 4 are arranged in a plurality, the adjusting rulers 4 are uniformly arranged between the adjusting rulers 4 and the inner side wall of the prefabricated mold 3, and the adjusting rulers 4 are annularly arranged along the arrangement direction of the fixed rod unit; the plurality of adjusting rules 4 move simultaneously to adjust the distance between the fixing rod unit and the prefabricated mold 3.
Specifically, the shape and size of the cross section of the prefabricated mold 3 are the same as those of the reserved hole, and a cavity is formed in the building structure by arranging the prefabricated mold 3 when concrete is poured in the building structure, namely, the reserved hole is formed.
Particularly, prefabricated mould 3 sets up a plurality of, and prefabricated mould 3's size sets up according to prefabricated reservation hole. It can be understood that, through setting up different prefabricated mould 3, can make the preparation that the hole mould was reserved to the self-extracting formula is applicable to different reservation holes, improved the application scope of the hole mould was reserved to the self-extracting formula.
Particularly, the upper end of dead lever unit is provided with a leader 1, and handle 1 and dead lever unit mutually perpendicular set up, can rotate the dead lever unit through setting up handle 1 to operating personnel operates the self-extracting type preformed hole mould.
Particularly, the dead lever unit links together with regulation chi 4, and regulation chi 4 links together with prefabricated mould 3, and the dead lever unit, regulation chi 4 and prefabricated mould 3 are connected as an organic wholely promptly, can be through the operation dead lever unit in order to operate prefabricated mould 3, promptly, rotate with prefabricated mould 3 of drive through rotating handle 1 to can be quick demolish prefabricated mould 3.
Specifically, the adjusting ruler 4 is a telescopic adjusting ruler 4, which can adjust its length in a telescopic manner.
Particularly, adjust chi 4 and set up a plurality of, specific quantity sets up according to actual conditions, and a plurality of regulation chi 4 are synchronous flexible to be applicable to not unidimensional prefabricated mould 3.
It can be seen that the self-pulling type reserved hole die is used for manufacturing reserved holes in a building structure, a plurality of prefabricated dies 3 are prefabricated according to the sizes of the reserved holes by arranging the fixing rod units, the adjusting ruler 4 and the prefabricated dies 3, so that the reserved holes with different sizes are manufactured by the same self-pulling type reserved hole die, and the application range of the self-pulling type reserved hole die is expanded; meanwhile, the position of the prefabricated mold 3 is adjusted by arranging the adjusting ruler 4, and the prefabricated mold 3 is fixed by the adjusting ruler 4, so that the construction efficiency is greatly improved, and the self-pulling type reserved hole mold can be quickly installed and fixed; set up the dead lever unit and fixed prefabricated mould 3 to predetermined position, improved the structural stability who reserves the hole mould from the formula of drawing, simultaneously, still wholly demolish prefabricated mould 3 through the dead lever unit, improved the efficiency of construction, can also prevent to lead to the fact destruction to the concrete structure when demolising prefabricated mould 3.
Further, after building structure formwork erection is accomplished, will reserve the hole mould from the pull-out type according to the drawing and fix on predetermined position, adjust adjusting ruler 4 and fix prefabricated mould 3 in the position that sets up of reserving the hole, can extract after pouring concrete one day and reserve the hole mould from the pull-out type, rotate the dead lever unit and can extract and reserve the hole mould from the pull-out type, the device reuse, no construction waste, high production efficiency, construction back concrete structure appearance quality is good, can adapt to not equidimension preformed hole, wide application scope.
Specifically, the fixing rod unit comprises a screw rod 2 and a nut 5, the screw rod 2 is arranged along the arrangement direction of the prefabricated mold 3, and the nut 5 is sleeved on the screw rod 2; the screw rod 2 is arranged opposite to the nut 5, namely, an external thread is arranged on the screw rod 2, and the nut 5 is connected together in a threaded connection mode.
Specifically, a plurality of the adjusting rules 4 are annularly arranged on the outer side wall of the nut 5. The adjusting ruler 4 is connected with the nut 5, and the screw rod 2 is connected with the nut 5, so that the screw rod 2 and the adjusting ruler 4 are detachably connected together, and the installation and the disassembly are convenient.
Specifically, the handle 1 and the upper end of the screw 2 are connected to each other and are disposed perpendicular to each other. The handle 1 and the screw rod 2 are connected through threads or directly welded together. The lower end of the screw 2 passes through the nut 5.
Specifically, a threaded pin shaft 6 is arranged on the outer side wall of the nut 5, the threaded pin shaft 6 is arranged along the arrangement direction of the adjusting ruler 4, and the end part of the adjusting ruler 4 is connected with the threaded pin shaft 6 through threads.
Particularly, be provided with the external screw thread on the threaded pin axle 6, the tip of adjusting chi 4 is provided with the internal thread hole, adjusts chi 4 and links together through threaded connection's mode with threaded pin axle 6 to in dismantlement.
Particularly, the self-pulling type reserved hole die further comprises a positioning unit, the positioning unit is the same as the fixing rod unit in the setting direction and sleeved on the fixing rod unit, and the positioning unit is used for positioning the fixing rod unit. Through setting up the positioning unit, improved when setting up the formula of drawing from reserving the hole mould, to the positioning accuracy who reserves the hole to the construction accuracy of reserving the hole when having improved the construction.
Specifically, the positioning unit comprises a positioning drill rod 15, an upper connecting plate 13 and a lower connecting plate 16, wherein the positioning drill rod 15 is arranged in the same direction as the screw rod 2 and penetrates through the nut 5; the upper connecting plate 13 and the lower connecting plate 16 are arranged in parallel relatively and are perpendicular to the positioning drill 15, and the nut 5 is arranged between the upper connecting plate 13 and the lower connecting plate 16.
Specifically, the positioning pin 15 is a cylindrical metal column. The upper connecting plate 13 and the lower connecting plate 16 are circular plates. Unthreaded hole or screw hole have been seted up at the middle part of upper junction plate 13, and unthreaded hole or screw hole set up with screw rod 2 relatively to make screw rod 2 can wear to establish in upper junction plate 13 effectively.
Specifically, the upper ends of the positioning pins 15 are connected to the upper connecting plate 13, and the lower ends of the positioning pins 15 are connected to the lower connecting plate 16. Specifically, the upper end of the positioning rod 15 is connected with the upper connecting plate 13 in a welding or clamping manner, and the lower end of the positioning rod 15 is connected with the lower connecting plate 16 in a welding or clamping manner. The lower ends of the positioning pins 15 are exposed from the lower connection plate 16 through the lower connection plate 16 by a certain length so that the lower ends of the positioning pins 15 are inserted into the form of the building structure for positioning.
Specifically, when the screw 2 is disposed, the screw 2 is passed through the upper connecting plate 13 and contacted with the lower connecting plate 16, so as to improve the connection stability of the screw 2.
Specifically, the plurality of positioning pins 15 are arranged in a ring shape along the circumferential direction of the screw 2. The number of setting up of location borer 15 sets up according to actual conditions, can improve the structural stability of positioning unit through setting up a plurality of location borers 15, and then can improve the structural stability of the hole mould is reserved to the formula of drawing certainly to and the stability of being connected of building structure template.
Referring to fig. 3, specifically, a plurality of first positioning holes 10 are uniformly formed in the nut 5, the first positioning holes 10 are arranged in the same direction as the positioning pins 15, and the first positioning holes 10 are used for allowing the positioning pins 15 to pass through.
Specifically, the first positioning holes 10 are arranged in a uniform ring shape along the circumferential direction of the nut 5, and the number of the first positioning holes 10 is actually three, preferably three.
Specifically, the lower connecting plate 16 is provided with a plurality of second positioning holes 9, the second positioning holes 9 are uniformly arranged in an annular manner along the circumferential direction of the lower connecting plate 16, the second positioning holes 9 are arranged opposite to the first positioning holes 10, and preferably, the number of the second positioning holes 9 is three, and is the same as the number of the first positioning holes 10. The second positioning hole 9 is used for passing the end of the positioning pin 15.
Specifically, the lower connecting plate 16 is further provided with a plurality of pin holes 11, and the pin holes 11 and the second positioning holes 9 are arranged alternately. That is, the pin holes 11 are annularly arranged along the circumferential direction of the lower connecting plate 16, and the pin holes 11 and the second positioning holes 9 are alternately arranged, that is, one pin hole 11 is arranged between every two adjacent second positioning holes 9, and the pin holes 11 are arranged at equal intervals with the two adjacent second positioning holes 9.
Specifically, the pin hole 11 is provided with a positioning pin 7. That is, the positioning pins 7 are inserted into the pin holes 11 to fix the lower connecting plate 16, that is, to fix the lower connecting plate 16 to the building structure formwork. The positioning pin 7 and the lower connecting plate 16 can be connected in a nail connection or clamping connection mode. The positioning pins 7 are preferably nails.
Specifically, the prefabricated mould 3 comprises a prefabricated steel pipe mould 31 and an inner support 8, the prefabricated steel pipe mould 31 is of an annular structure, the inner support 8 is laid on the inner side wall of the prefabricated steel pipe mould 31, and the inner support 8 is detachably connected with the end part of the adjusting ruler 4.
Can find out, through the present material of job site, the hole self-pulling type mould is reserved in the preparation, add handle 1 on the mould, the external screw thread lead screw, female screw nut 5, locating pin 7, mould size regulation chi 4, standard steel pipe mould 31, handle 1 and external screw thread lead screw are connected, the internal thread is connected with mould size regulation chi 4, mould size regulation chi 4 has cylinder arc shore, can adapt to the not equidimension reservation hole size, guarantee hollow integrality, and reuse, no construction waste, high production efficiency, good appearance quality.
When concrete implementation, above-mentioned reservation hole is from pulling out formula die set, through setting up handle 1, the external screw thread lead screw, internal screw nut 5, locating pin 7, mould size adjustment chi 4, standard steel pipe mould 31, handle 1 and external screw thread lead screw are connected, there is the hole in the internal screw thread lead screw, be suitable for and on locating pin 7, locating pin 7 is by location borer 15, locating pin 7 constitutes, internal screw nut 5 inserts on location borer 15, the internal thread is connected with mould size adjustment chi 4, mould size adjustment chi 4 has cylindrical arc to prop, internal screw thread steel pipe and external screw thread lead screw are constituteed, realize adjusting and reserve the hole size.
The standard die steel pipe is inserted into the self-pulling mechanical device, and a clamp is arranged in the standard die steel pipe, so that the cylindrical arc-shaped top support can be blocked.
After concrete is poured for one day, the mold can be detached, the handle 1 is rotated, the external thread lead screw rotates due to the rotation of the positioning pin 7, the internal thread nut 5 can ascend, the standard steel pipe mold 31 is driven to ascend, and the mold can be pulled out.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a hole mould is reserved to self-extracting formula which characterized in that includes: a fixed rod unit, an adjusting ruler and a prefabricated mould, wherein,
the prefabricated mould is of a hollow cylinder structure and is used for being inserted into a prefabricated plate template, so that a reserved hole is formed in the prefabricated plate after pouring and forming;
the fixed rod unit is inserted in the prefabricated mold, and the arrangement direction of the fixed rod unit is the same as that of the prefabricated mold;
the adjusting rulers are uniformly arranged between the adjusting rulers and the inner side wall of the prefabricated mold, and the adjusting rulers are annularly arranged along the arrangement direction of the fixed rod unit; the adjusting rules are used for moving to adjust the distance between the fixing rod unit and the prefabricated mould.
2. The self-pulling type preformed hole mold as claimed in claim 1, wherein the fixing rod unit comprises a screw rod and a nut, the screw rod is arranged along the arrangement direction of the preformed mold, and the nut is sleeved on the screw rod;
the adjusting rulers are annularly arranged on the outer side wall of the nut.
3. The self-pulling type preformed hole die as claimed in claim 2, wherein a threaded pin shaft is arranged on the outer side wall of the nut, the threaded pin shaft is arranged along the arrangement direction of the adjusting ruler, and the end part of the adjusting ruler is connected with the threaded pin shaft through threads.
4. The self-pulling type pre-drilled hole mold as claimed in claim 2, further comprising a positioning unit, wherein the positioning unit is arranged in the same direction as the fixing rod unit and sleeved on the fixing rod unit, and the positioning unit is used for positioning the fixing rod unit.
5. The self-pulling type preformed hole die as claimed in claim 2, wherein the positioning unit comprises a positioning drill rod, an upper connecting plate and a lower connecting plate, the positioning drill rod is arranged in the same direction as the screw rod and penetrates through the nut; the upper connecting plate and the lower connecting plate are arranged in parallel relatively and are perpendicular to the positioning drill rods, and the nuts are arranged between the upper connecting plate and the lower connecting plate;
the upper end of the positioning drill rod is connected with the upper connecting plate, and the lower end of the positioning drill rod is connected with the lower connecting plate.
6. The self-drawing hole reserving mold as claimed in claim 5, wherein the plurality of positioning pins are arranged in a ring shape along the circumferential direction of the screw.
7. The self-drawing hole reserving die as claimed in claim 6, wherein the nut has a plurality of first positioning holes uniformly formed therein, the first positioning holes are arranged in the same direction as the positioning pins, and the first positioning holes are used for the positioning pins to pass through.
8. The self-pulling pre-hole die as claimed in claim 7, wherein the lower connecting plate has a plurality of second positioning holes, the second positioning holes are opposite to the first positioning holes, and the second positioning holes are used for the ends of the positioning pins to pass through.
9. The self-pulling type preformed hole die as claimed in claim 8, wherein a plurality of pin holes are further formed in the lower connecting plate, and the pin holes and the second positioning holes are arranged alternately;
and a positioning pin penetrates through the pin hole.
10. The self-drawing preformed hole die as claimed in any one of claims 1 to 9, wherein the prefabricated die comprises a prefabricated steel pipe die and an inner support, the prefabricated steel pipe die is of an annular structure, the inner support is laid on the inner side wall of the prefabricated steel pipe die, and the inner support is detachably connected with the end part of the adjusting ruler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910943621.6A CN110805276A (en) | 2019-09-30 | 2019-09-30 | Self-pulling type preformed hole die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910943621.6A CN110805276A (en) | 2019-09-30 | 2019-09-30 | Self-pulling type preformed hole die |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110805276A true CN110805276A (en) | 2020-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910943621.6A Pending CN110805276A (en) | 2019-09-30 | 2019-09-30 | Self-pulling type preformed hole die |
Country Status (1)
| Country | Link |
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| CN (1) | CN110805276A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111963781A (en) * | 2020-09-09 | 2020-11-20 | 福州鼓楼纹英建筑工程有限责任公司 | Dry assembly for vertical pipe through concrete floor |
| CN114393675A (en) * | 2022-01-06 | 2022-04-26 | 北京凯盛建材工程有限公司 | Die for manufacturing preformed hole and method for manufacturing preformed hole of concrete precast slab |
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| CN111963781A (en) * | 2020-09-09 | 2020-11-20 | 福州鼓楼纹英建筑工程有限责任公司 | Dry assembly for vertical pipe through concrete floor |
| CN114393675A (en) * | 2022-01-06 | 2022-04-26 | 北京凯盛建材工程有限公司 | Die for manufacturing preformed hole and method for manufacturing preformed hole of concrete precast slab |
| CN114393675B (en) * | 2022-01-06 | 2024-01-30 | 北京凯盛建材工程有限公司 | Mould for manufacturing preformed hole and method for manufacturing preformed hole of concrete precast slab |
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Application publication date: 20200218 |
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| RJ01 | Rejection of invention patent application after publication |