CN113969676B - Prefabricated assembled column type maintenance pit and construction method thereof - Google Patents
Prefabricated assembled column type maintenance pit and construction method thereof Download PDFInfo
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- CN113969676B CN113969676B CN202111132304.XA CN202111132304A CN113969676B CN 113969676 B CN113969676 B CN 113969676B CN 202111132304 A CN202111132304 A CN 202111132304A CN 113969676 B CN113969676 B CN 113969676B
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- 238000010276 construction Methods 0.000 title claims abstract description 33
- 238000012423 maintenance Methods 0.000 title claims abstract description 14
- 230000002787 reinforcement Effects 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 50
- 239000010959 steel Substances 0.000 claims description 50
- 239000002002 slurry Substances 0.000 claims description 15
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 abstract description 10
- 238000011065 in-situ storage Methods 0.000 description 11
- 239000010410 layer Substances 0.000 description 11
- 238000009417 prefabrication Methods 0.000 description 9
- 238000007689 inspection Methods 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 241000264877 Hippospongia communis Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H5/00—Buildings or groups of buildings for industrial or agricultural purposes
- E04H5/02—Buildings or groups of buildings for industrial purposes, e.g. for power-plants or factories
- E04H5/06—Pits or building structures for inspection or services
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
-
- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
-
- 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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a prefabricated assembled column type maintenance pit, which comprises a prefabricated short column, a bottom plate and a hidden beam, wherein a track embedded part is embedded in the upper end of the prefabricated short column, a plurality of first reinforcing bars are embedded in the lower section of the prefabricated short column, and the first reinforcing bars extend out of two opposite side surfaces of the prefabricated short column along the longitudinal direction of a track; the two lateral sides of the bottom plate are provided with a plurality of precast column bottom areas which are longitudinally arranged at intervals along the track and a plurality of second reinforcing bars which are pre-buried on the two longitudinal side areas of the precast column bottom areas, and the second reinforcing bars extend out of the top of the bottom plate along the direction perpendicular to the track; the prefabricated short column is fixedly arranged on the bottom area of the prefabricated column; and the hidden beam is cast on the longitudinal two side areas of the bottom area of the prefabricated column, and a reinforcement cage is arranged in the hidden beam and is respectively connected with the first reinforcement and the second reinforcement. The invention also discloses a construction method of the prefabricated column type maintenance pit. The invention has the advantages of convenient construction, short construction period, high standardization degree, high connection strength and high integral precision.
Description
Technical Field
The invention belongs to the field of train overhaul facilities, and particularly relates to a prefabricated column type overhaul pit.
Background
The column type maintenance pit is a train maintenance facility which is necessary in urban rail transit field sections. At present, the cast-in-situ column type pit is the column type pit construction form with the widest domestic application range.
The construction method commonly used at present for the traditional cast-in-situ column type overhaul pit comprises the following steps:
firstly, pouring a bottom plate and a hidden beam of the inspection pit, and reserving short column steel bars of the inspection pit. In the pouring process of the short column, a positioning steel rail is required to be erected along the track direction, a track embedded part at the top of the short column of the inspection pit is buckled on the positioning steel rail, then concrete is poured around the reserved steel bars of the short column in a formwork supporting mode, the track embedded part and the short column are poured together, and after the short column reaches the design strength, the template and the positioning steel rail are removed.
The number of the traditional cast-in-situ column type inspection pits is large, so that the casting is needed for multiple times, the reservation is carried out for multiple times, the construction steps are complicated, and the requirement on the construction precision is extremely high. The following disadvantages are exposed in past projects:
(1) Because the short column is small in size, a metal template is required to be used for construction, so that the phenomenon of die sinking is easy to occur, concrete forms honeycombs, exposed stones and the like, and the engineering quality is influenced.
(2) The upper part needs to be paved with a track, so that the requirements on plane positioning and height positioning of the short column are extremely high.
(3) The plane positioning difficulty of the reserved short column steel bar is high, so that the steel bar needs to be re-planted to solve the deviation problem.
(4) Because the control of the short column construction precision is difficult, the phenomenon of insufficient length of the steel bars is easy to occur, and the protective layer of the concrete at the top of the column is too thick, so that the lower column head of the track embedded part is split during the use period.
(5) The concrete under the auxiliary buried plate of the column top fastener is difficult to pour and compact, hollowness is easy to appear, and the connection strength of the fastener and the short column can be ensured by requiring secondary repair.
(6) The construction process is tedious, the construction period is long.
Disclosure of Invention
The purpose of the invention is that: the prefabricated assembled column type maintenance pit and the construction method thereof are convenient to construct, short in construction period, high in standardization degree, high in connection strength and high in overall accuracy.
In order to solve the technical problem, a first aspect of the present invention provides a prefabricated column type pit, which comprises a prefabricated short column, a bottom plate and a hidden beam, wherein a track embedded part is embedded at the upper end of the prefabricated short column, a plurality of first reinforcing bars are embedded at the lower section of the prefabricated short column, and the first reinforcing bars extend out from two opposite side surfaces of the prefabricated short column along the longitudinal direction of a track; the two lateral sides of the bottom plate are provided with a plurality of precast column bottom areas longitudinally arranged along the track at intervals and a plurality of second reinforcing bars pre-buried on the two longitudinal side areas of the precast column bottom areas, and the second reinforcing bars extend out of the surface of the bottom plate along the direction perpendicular to the track; the prefabricated short column is fixedly arranged on the prefabricated column bottom area; the hidden beam is cast on the longitudinal two side areas of the bottom area of the prefabricated column, a reinforcement cage is arranged in the hidden beam, and the reinforcement cage is respectively connected with the first reinforcement and the second reinforcement.
The second aspect of the invention provides a construction method of a prefabricated column type pit, which comprises the following steps:
and 6, installing a hidden beam template and pouring concrete to form a hidden beam, so that the hidden beam, the bottom plate and the prefabricated short column form a whole.
In the step 1, first positioning angle steel is respectively embedded at the same height on both lateral sides of the prefabricated short column.
As a preferable scheme of the construction method of the prefabricated column type pit, the column head elevation leveling device comprises a second positioning angle steel and a jacking driving unit, wherein the second positioning angle steel is longitudinally arranged along the track, and the two longitudinal ends of the second positioning angle steel are respectively connected with the jacking driving unit;
when the column head elevation leveling device is used for adjusting column head elevation of a plurality of prefabricated short columns, a second positioning angle steel is respectively and horizontally erected at the lower positions of the first positioning angle steels at the two lateral sides of the plurality of prefabricated short columns which are longitudinally arranged in the same column, the second positioning angle steel is driven to be attached to the first positioning angle steel through the jacking driving unit, and meanwhile, the plurality of prefabricated short columns are driven to lift to realize column head elevation adjustment.
As the preferable scheme of the construction method of the prefabricated column type maintenance pit, the lifting driving unit is a manual jack, an electric jack or a hydraulic jack.
In the step 3, the thickness of the slurry layer is not less than 20mm as a preferable scheme of the construction method of the prefabricated column type pit.
Compared with the prior art, the prefabricated assembled column type overhaul pit and the construction method thereof have the beneficial effects that:
(1) The invention adopts a novel column type overhaul pit structure system of cast-in-situ hidden beams and prefabricated short columns to replace the traditional cast-in-situ method, reduces the construction difficulty of the column type overhaul pit and improves the construction efficiency of the column type overhaul pit; meanwhile, the prefabricated short column manufactured in a factory prefabricating mode can greatly improve the production quality and efficiency of column components, and effectively avoid the phenomenon of die running caused by cast-in-situ columns.
(2) According to the invention, through the integral prefabrication of the prefabricated short column and the track embedded part, the connection strength and the integral precision of the prefabricated short column and the track embedded part at the top end of the prefabricated short column can be ensured at one time, the quality and the standardization level of the prefabricated short column and the embedded part of the prefabricated short column are obviously improved, the length of the vertical steel bar in the prefabricated short column can be better controlled, the phenomenon that the thickness of the protective layer at the top of the column is overlarge is effectively avoided, and the problems of column head splitting and the like in the use process caused by the fact that the construction precision of the short column is difficult to meet in a cast-in-situ process are solved.
(3) According to the invention, the prefabricated short column reinforcement (namely the first reinforcement), the bottom plate reinforcement (namely the second reinforcement) and the hidden beam reinforcement cage are bound together, so that the reinforcement is stressed cooperatively, and finally the prefabricated short column and the bottom plate are connected into a whole through pouring the hidden beam, thereby meeting the stress requirements of the column type maintenance pit under the working conditions of running, parking and the like of a train.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a schematic structural view of a prefabricated column type pit provided by an embodiment of the present invention;
fig. 2 is a schematic structural view of a prefabricated stub;
FIG. 3 is a schematic structural view of a base plate;
FIG. 4 is a cross-sectional view of A-A in the structure shown in FIG. 3;
FIG. 5 is a schematic view of the structure after construction of the precast short column and the hidden beam;
FIG. 6 is a cross-sectional view of B-B in the structure shown in FIG. 5;
FIG. 7 is a cross-sectional view of C-C in the structure shown in FIG. 5;
FIG. 8 is a schematic diagram of a structure of a plurality of precast studs leveled under a stud elevation leveling device;
the marks in the figure:
1. the device comprises a prefabricated short column, 101, a reinforcement penetrating hole, 2, a bottom plate, 201, a prefabricated column bottom area, 202, a hidden beam pouring area, 3, a hidden beam, 4, a track embedded part, 5, a first reinforcing steel bar, 6, a second reinforcing steel bar, 7, a reinforcing steel bar cage, 8, a slurry sitting layer, 9, a first positioning angle steel, 10, a second positioning angle steel, 11 and a jacking driving unit.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the machine or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. It should be understood that the terms "first," "second," and the like are used herein to describe various information, but such information should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the invention.
In the description of the present invention, it should be understood that the terms "mounted," "connected," and "connected" are to be construed broadly in this application, and may be either fixedly connected, detachably connected, or integrally connected, for example, unless otherwise explicitly stated and defined; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 7, the prefabricated assembled column type access pit provided by the embodiment of the invention comprises a prefabricated short column 1, a bottom plate 2 and a hidden beam 3, wherein a track embedded part 4 is embedded at the upper end of the prefabricated short column 1, a plurality of first reinforcing steel bars 5 are embedded at the lower section of the prefabricated short column 1, and the first reinforcing steel bars 5 extend out from two opposite side surfaces of the prefabricated short column 1 along the longitudinal direction of a track; a plurality of precast column bottom regions 201 which are longitudinally arranged at intervals along the track and a plurality of second reinforcing bars 6 which are pre-buried on the regions on the two longitudinal sides of the precast column bottom regions 201 (namely, the hidden beam casting regions 202) are arranged on the two lateral sides of the bottom plate 2, and the second reinforcing bars 6 extend out of the surface of the bottom plate 2 along the direction perpendicular to the track; the pre-fabricated stub 1 is fixedly mounted on the pre-fabricated stub bottom region 201; the hidden beam 3 is cast on the longitudinal two side areas of the prefabricated column bottom area 201, a reinforcement cage 7 is arranged in the hidden beam 3, and the reinforcement cage 7 is respectively connected with the first reinforcement 5 and the second reinforcement 6.
As shown in fig. 1 to 8, based on the prefabricated column type pit, the embodiment of the invention further provides a construction method of the prefabricated column type pit, which comprises the following steps:
and 6, installing a hidden beam 3 template and pouring concrete to form a hidden beam 3, so that the hidden beam 3, the bottom plate 2 and the prefabricated short column 1 form a whole.
As shown in fig. 8, in the step 1, one or more first positioning angle steels 9 are respectively pre-embedded on the same height on two lateral sides of the prefabricated short column 1, so as to facilitate lifting of the prefabricated short column 1 by a crane and supporting lifting of the prefabricated short column 1 by a column head elevation leveling device, thereby realizing automatic and mechanical construction of the column. Specifically, the column head elevation leveling device comprises a second positioning angle steel 10 and a jacking driving unit 11, wherein the second positioning angle steel 10 is longitudinally arranged along a rail, and the jacking driving unit 11 is respectively connected with two longitudinal ends of the second positioning angle steel 10; wherein, the lifting driving unit 11 is a manual jack, an electric jack or a hydraulic jack. When the column head elevation leveling device is used for adjusting column head elevation of a plurality of prefabricated short columns 1, a second positioning angle steel 10 is respectively and horizontally erected below the first positioning angle steel 9 on the two lateral sides of the prefabricated short columns 1 which are longitudinally arranged in the same row, the jacking driving unit 11 drives the second positioning angle steel 10 to be attached to the first positioning angle steel 9, and meanwhile, the prefabricated short columns 1 are driven to lift to realize column head elevation adjustment. That is, as long as the first positioning angle steel 9 and the second positioning angle steel 10 are aligned accurately, all column heads can be positioned accurately, so that the column head elevation of the plurality of prefabricated short columns 1 can be adjusted precisely at the same time, the installation and positioning efficiency of the prefabricated short columns 1 is improved remarkably, and the construction period is shortened further.
Illustratively, in the step 3, the thickness of the sitting slurry layer 8 is not less than 20mm, so as to ensure that the thickness of the poured sitting slurry layer 8 is ensured, and the connection compactness of the sitting slurry layer 8 between the prefabricated short column 1 and the bottom plate 2 is improved.
Therefore, the prefabricated column type pit and the construction method thereof provided by the embodiment of the invention have the innovation key that:
(1) According to the embodiment of the invention, a novel column type overhaul pit structure system of the cast-in-situ hidden beam 3+ prefabricated short column 1 is adopted to replace the traditional cast-in-situ method, so that the construction difficulty of the column type overhaul pit is reduced, and the construction efficiency of the column type overhaul pit is improved; meanwhile, the prefabricated short column 1 manufactured in a factory prefabricating mode can greatly improve the production quality and efficiency of column components and effectively avoid the phenomenon of die sinking caused by cast-in-situ columns.
(2) According to the embodiment of the invention, through the integral prefabrication of the prefabrication short column 1 and the track embedded part 4, the connection strength and the integral precision of the prefabrication short column 1 and the track embedded part 4 at the top end of the prefabrication short column can be ensured at one time, the quality and the standardization level of the prefabrication short column 1 and the embedded part of the prefabrication short column are obviously improved, the length of the vertical steel bars in the prefabrication short column 1 can be better controlled, the phenomenon that the thickness of a protective layer at the top of the prefabrication short column is overlarge is effectively avoided, and the problems that column head splitting and the like occur in the using process because the construction precision of the short column is difficult to meet in a cast-in-situ process are solved.
(3) According to the embodiment of the invention, the prefabricated short column steel bars (namely the first steel bars 5), the bottom plate steel bars (namely the second steel bars 6) and the hidden beam steel bar cage 7 are bound together, so that the steel bars are stressed cooperatively, and finally the prefabricated short column 1 and the bottom plate 2 are connected into a whole through pouring the hidden beam 3, thereby meeting the stress requirements of the column type maintenance pit under the working conditions of running, parking and the like of a train.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (3)
1. The construction method of the prefabricated column type maintenance pit is characterized by comprising the following steps of:
step 1, manufacturing a prefabricated short column, embedding a rail embedded part at the upper end of the prefabricated short column, embedding a plurality of first steel bars at the lower section of the prefabricated short column, and extending the first steel bars from two opposite side surfaces of the prefabricated short column along the rail longitudinal direction; wherein, first positioning angle steel is respectively pre-embedded on the same height of the two lateral sides of the prefabricated short column;
step 2, pouring a bottom plate in the maintenance pit area, dividing a plurality of precast column bottom areas which are longitudinally and alternately arranged along a track on two lateral sides of the bottom plate according to the distribution positions of the precast columns, taking the longitudinal two side areas of the precast column bottom areas as hidden beam pouring areas, and pre-burying a plurality of second reinforcing steel bars on the hidden beam pouring areas, wherein the second reinforcing steel bars extend out of the top of the bottom plate along the direction perpendicular to the track;
step 3, measuring and trimming the flatness of the bottom area of the prefabricated column of the bottom plate, and pouring a slurry layer with proper thickness in the bottom area of the prefabricated column of the bottom plate;
step 4, adjusting the column head elevation of the plurality of prefabricated short columns to the same height through a column head elevation leveling device and sitting on the slurry layer to ensure that the slurry layer is compact, and completing the positioning of the prefabricated short columns; the column head elevation leveling device comprises second positioning angle steel and a jacking driving unit, wherein the second positioning angle steel is longitudinally arranged along the track, and the two longitudinal ends of the second positioning angle steel are respectively connected with the jacking driving unit;
when the column head elevation leveling device is used for adjusting column head elevation of a plurality of prefabricated short columns, a second positioning angle steel is respectively and horizontally erected below the first positioning angle steel on the two lateral sides of the prefabricated short columns in the same longitudinal direction, the second positioning angle steel is driven to be attached to the first positioning angle steel through the jacking driving unit, and meanwhile the prefabricated short columns are driven to lift to realize column head elevation adjustment;
step 5, binding a reinforcement cage on the hidden beam casting area, and enabling the reinforcement cage to be connected with the first reinforcement and the second reinforcement respectively;
and 6, installing a hidden beam template and pouring concrete to form a hidden beam, so that the hidden beam, the bottom plate and the prefabricated short column form a whole.
2. The construction method of a prefabricated column type pit according to claim 1, wherein the jacking driving unit is a manual jack, an electric jack or a hydraulic jack.
3. The method for constructing a prefabricated column type pit according to claim 1, wherein in the step 3, the thickness of the slurry layer is not less than 20mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111132304.XA CN113969676B (en) | 2021-09-26 | 2021-09-26 | Prefabricated assembled column type maintenance pit and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111132304.XA CN113969676B (en) | 2021-09-26 | 2021-09-26 | Prefabricated assembled column type maintenance pit and construction method thereof |
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| CN113969676A CN113969676A (en) | 2022-01-25 |
| CN113969676B true CN113969676B (en) | 2023-05-02 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047423A (en) * | 2014-05-14 | 2014-09-17 | 中建七局第二建筑有限公司 | Mold and construction method for precisely reserving hole in floorslab |
| CN111926910A (en) * | 2020-07-29 | 2020-11-13 | 江苏新盈装配建筑科技有限公司 | Installation method of fabricated building |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI662172B (en) * | 2017-10-20 | 2019-06-11 | Ruentex Engineering & Construction Co., Ltd. | Construction method for a building |
| CN108425375B (en) * | 2018-04-25 | 2025-03-25 | 李藏柱 | A prefabricated foundation column and its connection structure and construction method |
| CN109339087B (en) * | 2018-10-08 | 2023-10-27 | 贺州通号装配式建筑有限公司 | Infrastructure system of low-rise building |
| CN112240111B (en) * | 2020-06-11 | 2025-05-30 | 中铁第四勘察设计院集团有限公司 | A subway prefabricated column-type inspection pit structure and construction method |
| CN213953148U (en) * | 2020-10-29 | 2021-08-13 | 中亿丰建设集团股份有限公司 | Column type inspection pit precast concrete track column |
| DE202020004631U1 (en) * | 2020-11-04 | 2020-12-21 | BOOS Werkstatt- u. Industrieausrüstung GmbH-Oberhausen- | Test and workshop pits |
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- 2021-09-26 CN CN202111132304.XA patent/CN113969676B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047423A (en) * | 2014-05-14 | 2014-09-17 | 中建七局第二建筑有限公司 | Mold and construction method for precisely reserving hole in floorslab |
| CN111926910A (en) * | 2020-07-29 | 2020-11-13 | 江苏新盈装配建筑科技有限公司 | Installation method of fabricated building |
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