CN113914682B - Prefabricated cavity column assembly type column type maintenance pit and construction method thereof - Google Patents
Prefabricated cavity column assembly type column type maintenance pit and construction method thereof Download PDFInfo
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- CN113914682B CN113914682B CN202111132378.3A CN202111132378A CN113914682B CN 113914682 B CN113914682 B CN 113914682B CN 202111132378 A CN202111132378 A CN 202111132378A CN 113914682 B CN113914682 B CN 113914682B
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- 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
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- 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
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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
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
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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
- 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
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Abstract
The invention discloses a prefabricated cavity column assembly type column type maintenance pit, which comprises a prefabricated short column, a bottom plate and a hidden beam, wherein the prefabricated short column is provided with a cavity with an opening at the lower end, a track embedded part is embedded at the upper end of the prefabricated short column, and a first reinforcing steel bar is connected to the lower section of the prefabricated short column in a penetrating way; 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, second reinforcing steel bars which are pre-buried on the precast column bottom areas and can extend into the cavities of the precast short columns, and third reinforcing steel bars which are pre-buried on the two longitudinal side areas of the precast column bottom areas; the prefabricated short column is arranged on the bottom area of the prefabricated column, and concrete for connecting the first steel bar and the second steel bar is poured into a cavity of the prefabricated short 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 for connecting the first reinforcement and the third reinforcement is arranged in the hidden beam. The invention also discloses a construction method of the overhaul 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 cavity column type overhaul pit and a construction method thereof.
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) The steel bars in the short columns are dense, the space between the short columns is smaller, the field operation space is limited, the field steel bars are difficult to bind, and the construction is inconvenient.
(2) 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.
(3) The upper part is required to be paved with a track, so that the plane positioning and height positioning requirements on the short column are extremely high, the plane positioning difficulty of the reserved longitudinal steel bars of the bottom plate and the short column is high, positioning deviation is easy to occur, and the steel bars are required to be planted again 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 cavity column assembly 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 invention provides a prefabricated cavity column assembly type column type pit, which comprises a prefabricated short column, a bottom plate and a hidden beam, wherein the prefabricated short column is provided with a cavity with an opening at the lower end, a track embedded part is embedded at the upper end of the prefabricated short column, a first reinforcing steel bar is connected with the lower section of the prefabricated short column in a penetrating way, and the first reinforcing steel bar extends 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 which are longitudinally arranged at intervals along the track, second reinforcing steel bars which are pre-buried on the precast column bottom areas and can extend into the cavities of the precast short columns, and third reinforcing steel bars which are pre-buried on the two longitudinal side areas of the precast column bottom areas, wherein the second reinforcing steel bars and the third reinforcing steel bars extend out of the surface of the bottom plate along the direction perpendicular to the track; the precast short column is vertically arranged on the precast column bottom area, and concrete for connecting the first steel bar and the second steel bar is poured in a cavity of the precast short column; 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 third reinforcement.
As the preferable scheme of the prefabricated cavity column assembly type column type maintenance pit, the lower section part of the prefabricated short column is provided with a plurality of reinforcement penetrating holes for the first reinforcement to penetrate through, and the reinforcement penetrating holes are communicated with the cavity of the prefabricated short column.
As the preferable scheme of the prefabricated cavity column assembly type column type maintenance pit, the side wall of the cavity of the prefabricated short column is provided with a pouring hole for pouring concrete into the cavity of the prefabricated short column.
The second aspect of the invention provides a construction method of a prefabricated cavity column assembly type column type maintenance pit, which comprises the following steps:
and 7, 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 cavity column assembly type column type pit, 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 a track, and the jacking driving unit is respectively connected with two longitudinal ends of the second positioning angle steel;
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 cavity column assembly type column type maintenance pit, the jacking driving unit is a manual jack, an electric jack or a hydraulic jack.
In the step 3, a gap of at least 20mm is reserved between the prefabricated short column and the bottom plate.
Compared with the prior art, the prefabricated cavity column assembly type column type maintenance 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 embodiment of the invention, the prefabricated short column is optimized to be the cavity column, the weight of the prefabricated short column is reduced on the premise of meeting the strength requirement of the short column, the prefabricated short column is convenient to transport and install, meanwhile, the second reinforcing steel bar on the bottom plate can extend into the cavity of the prefabricated short column, the precision requirement is more relaxed compared with that of a cast-in-place scheme, the re-planting of the reinforcing steel bar can be avoided to a great extent, and the problem that on-site reinforcing steel bar binding is difficult is solved.
(3) 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.
(4) According to the invention, the prefabricated short column steel bars (namely the first steel bars), the bottom plate steel bars (namely the second steel bars and the third steel bars) and the hidden beam steel bar cage are bound together, so that the steel bars are stressed cooperatively, and finally the prefabricated short column and the bottom plate are connected into a whole through pouring the hidden beam, so that the structure is stable and reliable, and the stress requirements under the working conditions of running, parking and the like of a train are ensured to be met.
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 cavity column assembly type column type pit provided by an embodiment of the invention;
fig. 2 is a cross-sectional view of a pre-fabricated 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 cross-sectional view of B-B in the structure shown in FIG. 3;
fig. 6 is a schematic view of the structure of the pre-fabricated stub when mounted in the pre-fabricated stub bottom region;
FIG. 7 is a cross-sectional view of C-C in the structure shown in FIG. 6;
fig. 8 is a schematic view of the construction of the reinforcement cage when installed in the dark beam casting area;
FIG. 9 is a cross-sectional view of D-D in the structure shown in FIG. 8;
fig. 10 is a schematic view of the structure of fig. 7 after casting concrete into the cavity of the precast stub;
FIG. 11 is a schematic view of the structure of FIG. 9 after the dark beam is cast;
FIG. 12 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 concrete pile comprises a prefabricated short column, 101, a cavity, 102, a rib penetrating hole, 103, a pouring 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 steel bar, 6, a second steel bar, 7, a third steel bar, 8, concrete, 9, a steel reinforcement cage, 10, a slurry layer, 11, a first positioning angle steel, 12, a second positioning angle steel, 13 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 11, the prefabricated cavity column assembly type column type pit provided by the embodiment of the invention comprises a prefabricated short column 1, a bottom plate 2 and a hidden beam 3, wherein the prefabricated short column 1 is provided with a cavity 101 with an opening at the lower end, a track embedded part 4 is embedded at the upper end of the prefabricated short column 1, a first reinforcing steel bar 5 is connected with the lower section of the prefabricated short column 1 in a penetrating manner, and the first reinforcing steel bar 5 extends out from two opposite side surfaces of the prefabricated short column 1 along the longitudinal direction of a track; the two lateral sides of the bottom plate 2 are provided with a plurality of precast column bottom areas 201 which are longitudinally arranged at intervals along a track, second reinforcing steel bars 6 which are pre-embedded on the precast column bottom areas 201 and can extend into the cavity 101 of the precast short column 1, and third reinforcing steel bars 7 which are pre-embedded on two longitudinal side areas (namely, a hidden beam casting area 202) of the precast column bottom areas 201, wherein the second reinforcing steel bars 6 and the third reinforcing steel bars 7 extend out of the surface of the bottom plate 2 along the direction perpendicular to the track; the precast short column 1 is vertically installed on the precast column bottom region 201, and concrete 8 for connecting the first steel bar 5 and the second steel bar 6 is poured in the cavity 101 of the precast short column 1; the hidden beam 3 is cast on the longitudinal two side areas of the prefabricated column bottom area 201, a reinforcement cage 9 is arranged in the hidden beam 3, and the reinforcement cage 9 is respectively connected with the first reinforcement 5 and the third reinforcement 7.
Illustratively, as shown in fig. 2, the lower section of the precast short column 1 is provided with a plurality of tendon holes 102 through which the first steel bars 5 can be connected, and the tendon holes 102 are communicated with the cavity 101 of the precast short column 1. By means of the design, the plane positioning difficulty of the longitudinal steel bars of the prefabricated short columns 1 can be reduced, the precision requirement is more relaxed compared with that of a cast-in-situ scheme, the adjustment is convenient, and the re-planting of the steel bars can be avoided to a great extent.
Illustratively, as shown in fig. 2, the side wall of the cavity 101 of the precast short column 1 is provided with a pouring hole 103 through which the concrete 8 is poured into the cavity 101 of the precast short column 1. Preferably, at least two pouring holes 103 are provided.
As shown in fig. 1 to 12, based on the prefabricated cavity column assembly type column type pit, the embodiment of the invention further provides a construction method of the prefabricated cavity column assembly type column type pit, which comprises the following steps:
and 7, installing a hidden beam template and pouring concrete 8 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.
In the step 1, as shown in fig. 12, one or more first positioning angle steels 11 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 matching with a crane and supporting lifting of the prefabricated short column 1 by matching with 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 12 and a jacking driving unit 13, wherein the second positioning angle steel 12 is longitudinally arranged along a rail, and the jacking driving unit 13 is respectively connected with two longitudinal ends of the second positioning angle steel 12; wherein, the lifting driving unit 13 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 12 is respectively and horizontally erected below the first positioning angle steel 11 on the two lateral sides of the prefabricated short columns 1 in the same longitudinal direction, the second positioning angle steel 12 is driven to be attached to the first positioning angle steel 11 through the jacking driving unit 13, 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 11 and the second positioning angle steel 12 are aligned accurately, positioning accuracy of all column heads can be guaranteed, so that simultaneous fine adjustment of column head elevations of a plurality of prefabricated short columns 1 is achieved at one time, installation and positioning efficiency of the prefabricated short columns 1 is improved remarkably, and construction period is shortened further.
In the step 3, a gap of at least 20mm is reserved between the prefabricated short column 1 and the bottom plate 2 so as to ensure the thickness of the casting slurry layer 10 and improve the connection compactness of the slurry layer 10 between the prefabricated short column 1 and the bottom plate 2.
Therefore, the prefabricated cavity column assembly type column type overhaul pit and the construction method thereof provided by the embodiment of the invention have the innovative key points 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, the prefabricated short column 1 is optimized to be a cavity column, the weight of the prefabricated short column 1 is reduced on the premise of meeting the strength requirement of the short column, the prefabricated short column 1 is convenient to transport and install, meanwhile, the second steel bar 6 on the bottom plate 2 can extend into the cavity 101 of the prefabricated short column 1, the precision requirement is more relaxed compared with a cast-in-place scheme, the re-planting of steel bars can be avoided to a great extent, and the problem of difficulty in binding steel bars on site is solved.
(3) 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.
(4) 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 third steel bars 7) and the hidden beam steel bar cage 9 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, so that the stress requirements under the working conditions of running, parking and the like of a train are ensured to be met.
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 (6)
1. The prefabricated cavity column assembly type column type maintenance pit is characterized by comprising a prefabricated short column, a bottom plate and a hidden beam, wherein the prefabricated short column is provided with a cavity with an opening at the lower end, a track embedded part is embedded at the upper end of the prefabricated short column, a first reinforcing steel bar is connected to the lower section of the prefabricated short column in a penetrating manner, and the first reinforcing steel bar extends 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, second reinforcing steel bars which are pre-buried on the precast column bottom areas and can extend into the cavities of the precast short columns, and third reinforcing steel bars which are pre-buried on the two longitudinal side areas of the precast column bottom areas, wherein the second reinforcing steel bars and the third reinforcing steel bars extend out of the surface of the bottom plate along the direction perpendicular to the track; the precast short column is vertically arranged on the precast column bottom area, and concrete for connecting the first steel bar and the second steel bar is poured in a cavity of the precast short column; the hidden beam is cast on the two longitudinal 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 third reinforcement;
first positioning angle steel for matching with a column head elevation leveling device is respectively pre-embedded on the same height of the two lateral sides of the prefabricated short column; 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 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.
2. The prefabricated cavity column assembly type column type pit of claim 1, wherein the lower section of the prefabricated short column is provided with a plurality of reinforcement penetrating holes for the first reinforcement to penetrate through, and the reinforcement penetrating holes are communicated with the cavity of the prefabricated short column.
3. A prefabricated cavity column fabricated column access pit according to claim 1, wherein the cavity side walls of the prefabricated stub are provided with pouring holes for pouring concrete into the prefabricated stub cavity.
4. The construction method of the prefabricated cavity column assembly type column type maintenance pit is characterized by comprising the following steps of:
step 1, manufacturing a prefabricated short column, wherein the prefabricated short column is provided with a cavity with an opening at the lower end, a track embedded part is embedded at the upper end of the prefabricated short column, and a plurality of reinforcement penetrating holes for the first reinforcement to penetrate are reserved at the lower section of the prefabricated short column; respectively pre-burying first positioning angle steel on the same height at the two lateral sides of the prefabricated short column;
step 2, pouring a bottom plate in a 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 precast short columns, taking the longitudinal two-side areas of the precast column bottom areas as hidden beam pouring areas, pre-burying second reinforcing steel bars which can extend into cavities of the precast short columns on the precast column bottom areas, pre-burying third reinforcing steel bars on the longitudinal two-side areas of the precast column bottom areas, and enabling the second reinforcing steel bars and the third reinforcing steel bars to 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, hoisting the prefabricated short column to the position right above the bottom area of the prefabricated column, and ensuring that second steel bars pre-buried on the bottom plate extend into the cavity of the prefabricated short column when the prefabricated short column falls down;
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 for positioning; after the prefabricated short column is positioned, a gap is reserved between the prefabricated short column and the bottom plate, and a slurry-setting layer is poured into the gap, so that the connection between the prefabricated short column and the bottom plate is compact; 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, penetrating and connecting first steel bars at the lower section of the prefabricated short column, wherein the first steel bars extend out of two opposite side surfaces of the prefabricated short column along the longitudinal direction of the track; binding a reinforcement cage on the hidden beam casting area, and connecting the reinforcement cage with the first reinforcement and the third reinforcement respectively;
step 6, pouring concrete into the cavity of the precast short column, and connecting the concrete with the first steel bar and the second steel bar respectively to connect the precast short column with the bottom plate;
and 7, 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.
5. The construction method of the prefabricated cavity column assembly type column type pit according to claim 4, wherein the jacking driving unit is a manual jack, an electric jack or a hydraulic jack.
6. The method for constructing a prefabricated hollow column type pit according to claim 4, wherein in the step 3, a gap of at least 20mm is reserved between the prefabricated short column and the bottom plate.
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| WO2017206412A1 (en) * | 2016-06-03 | 2017-12-07 | 长沙远大住宅工业集团股份有限公司 | Superimposed assembly-type underground pipe gallery system and construction and manufacturing process |
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