CN111236641A - Aluminum alloy template top plate water supply and drainage reserved hole die and construction method thereof - Google Patents
Aluminum alloy template top plate water supply and drainage reserved hole die and construction method thereof Download PDFInfo
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- CN111236641A CN111236641A CN202010050774.0A CN202010050774A CN111236641A CN 111236641 A CN111236641 A CN 111236641A CN 202010050774 A CN202010050774 A CN 202010050774A CN 111236641 A CN111236641 A CN 111236641A
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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
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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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- 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
- E04G17/00—Connecting or other auxiliary members for forms, falsework structures, or shutterings
- E04G17/06—Tying means; Spacers ; Devices for extracting or inserting wall ties
- E04G17/065—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning
- E04G17/0655—Tying means, the tensional elements of which are threaded to enable their fastening or tensioning the element consisting of several parts
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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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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
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- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The invention provides a die for reserving holes for water supply and drainage of an aluminum alloy template top plate and a construction method thereof, wherein the method comprises the following steps: s1, positioning the center point of the reserved hole; s2, manufacturing the embedded pipe and a square pipe tangent to the inner wall of the embedded pipe; s3, positioning and fixing the square tube; s4, forming a hole on the central line of the square pipe; s5, welding a nut at the position, corresponding to the hole, of the upper part of the square tube, and connecting a counter-pull screw rod in the nut in a threaded manner to be screwed into the nut; s6, positioning and placing the embedded pipe to enable the inner wall of the embedded pipe to be tangent to the square pipe; s7, arranging a baffle at the opening end of the embedded pipe, wherein the baffle is provided with a through hole penetrating through the split screw; s8, fixing a baffle on the counter-pulling screw rod through a nut, and correcting while fixing; s9, pouring concrete, and correcting the counter-pulling screw rod in real time; and S10, removing the mould after the concrete reaches the required strength, and recovering the embedded pipe. The method is simple and practical, can effectively improve the construction accuracy of the water supply and drainage pre-buried hole, improves the engineering quality, has good use effect, and can be popularized and used.
Description
Technical Field
The invention relates to a construction technology of a water supply and drainage reserved hole, in particular to a water supply and drainage reserved hole die for an aluminum alloy template top plate and a construction method of the water supply and drainage reserved hole die.
Background
Along with the development of reform and open business of China and the improvement of domestic living standard, the requirements of people on living conditions are higher and higher, living land is less and less, the existing higher and higher residential buildings are built, and more standard floors are provided. For civil engineering, the development caused by rapid expansion of the scale is becoming the past form, and construction enterprises in the traditional construction industry face intense market competition. The construction quality is an important index for examining a construction enterprise, the quality importance is highlighted, the aluminum alloy template is favored by the construction enterprises with numerous advantages, and the aluminum alloy template becomes an important construction material.
When the aluminum alloy template is used for the construction of the reserved holes for water supply and drainage, the following problems can be encountered: 1. the construction period is influenced because the reserved sleeve is installed slowly. 2. The reserved sleeve is not accurately installed or is displaced after installation, so that later installation is influenced. 3. The aluminum mould is fixed on the position of the water supply and drainage hole, so that the construction difficulty exists, and the repeated utilization cannot be realized. 4. The traditional construction mode damages the aluminum mould, the holes are not easy to block, slurry leaks during concrete pouring, the later concrete forming is influenced, and the traditional method for reserving the holes for fixing the water supply and drainage pipes on the wood formwork cannot be suitable for the aluminum mould. The log template construction method is characterized in that reserved embedded iron pipes are fixed on a wood template by using a plurality of strands of tie wires and iron nails, the iron nails cannot be easily nailed into the aluminum alloy template, and the template is difficult to disassemble in a split mode after the iron nails are fixed. 5. If the sleeve is directly embedded, because the floors are more, the aluminum die changes on certain floors, the embedding position is inaccurate, the requirement on vertical precision is higher when the water supply and drainage pipe is installed in the later period, the control difficulty is higher, the later period rework cost is high, and the rework difficulty is high. 6. Concrete easily gets into in the pre-buried reservation hole of using of concrete placement in-process, influences the later stage installation.
Disclosure of Invention
The invention aims to solve the technical problem that the defects of the prior art are overcome, and the invention provides the hole reserving die for water supply and drainage of the aluminum alloy template top plate and the construction method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides an aluminum alloy template roof plumbing reservation hole mould, a serial communication port, including square pipe, embedded pipe and to drawing the screw rod, square pipe is through from tapping fixed connection on aluminum alloy template roof, offers first through-hole on the vertical center line of square pipe, welds first nut on the first through-hole, and first nut internal thread connects to drawing the screw rod, the embedded pipe sets up the inner wall of the side outside of tubes side and embedded pipe is tangent with square pipe, wear to drawing the screw rod and establish on the vertical center line of square pipe, embedded pipe upper end opening part sets up wooden baffle, pass to drawing the screw rod wooden baffle, be provided with the second nut that is used for fixed wooden baffle on drawing the screw rod.
A construction method for using the aluminum alloy template top plate water supply and drainage reserved hole mold for water supply and drainage reserved holes is characterized by comprising the following steps:
s1, positioning a prepared hole: after the aluminum alloy formwork of the building floor is erected, the central points of a plurality of circular water supply and drainage preformed holes are positioned on the aluminum alloy formwork bottom plate according to construction drawings, accurate preformed hole profiles are drawn by using a striking oil pen according to the positioned preformed hole central points and the preformed hole design radius, and the drawn pre-buried hole diameter is 25mm larger than that of a water supply and drainage pipe designed by the drawings, so that the water supply and drainage pipe can be conveniently installed in the later period;
s2, manufacturing a pre-buried pipe and a square pipe: manufacturing an embedded pipe used for forming the preformed hole according to a drawing, wherein the embedded pipe is made of cast iron, the outer diameter of the embedded pipe is equal to the diameter of the preformed hole, namely the outer diameter of the embedded pipe is 25mm larger than the diameter of a water supply and drainage pipe designed by the drawing, the length of the embedded pipe is 50mm larger than the design thickness of a floor slab, so that demoulding is facilitated, manufacturing a square pipe internally tangent and fixed with the inner wall of the embedded pipe according to the inner diameter of the embedded pipe, marking a central point, namely a diagonal intersection point, on the upper surface and the lower surface of the square pipe, which are opposite to each other, and marking the surface of the central point on the square pipe;
s3, positioning and fixing the square tube: fixing the square tube on an aluminum alloy template base plate through self-tapping, ensuring that a central line formed by two central points at the mark position of the square tube is superposed with a central line of a reserved hole, and forming a first through hole of phi 16 along the vertical central line of the square tube by using an electric drill;
s4, mounting and fixing a first nut: fixing a first nut matched with the phi 14 split screw in model number on the square tube by spot welding, and ensuring that the central line of the first nut is superposed with the central line of a first through hole formed in the square tube;
s5, installing a counter-pull screw: screwing a split screw of phi 14 into a first nut, wherein the split screw is in threaded connection with the first nut, and the type of the split screw is usually one type smaller than that of the first through hole, so that the split screw can be conveniently penetrated and fixed;
s6, positioning and placing the embedded pipe: placing the pre-buried pipe according to the position of the reserved hole drawn in the S1, ensuring that the inner wall of the pre-buried pipe is internally tangent to the two end faces of the square pipe in the horizontal position, positioning and fixing the pre-buried pipe by the square pipe, and coating a release agent on the outer wall of the pre-buried pipe;
s7, fixing the counter-pulling screw: the opening end of the embedded pipe is provided with a wooden baffle, a second through hole for penetrating through the opposite-pulling screw rod is formed in the wooden baffle, one end face of the wooden baffle blocks the opening of the embedded pipe to prevent concrete from entering the embedded pipe when the concrete is poured, the other end face of the wooden baffle is fixed on the opposite-pulling screw rod through a second nut, the opposite-pulling screw rod is kept perpendicular when the second nut is screwed, the position of the embedded pipe is corrected for the second time, and the square pipe, the embedded pipe, the wooden baffle and the opposite-pulling screw rod are fixedly connected together through the first nut and the second nut;
s8, pouring concrete: pouring concrete in the aluminum alloy template, arranging a specially-assigned person to observe the verticality of the counter-pulling screw rod constantly in the pouring process, and immediately correcting the verticality if the deviation exists;
s9, demolding: demolish the second nut in proper order after the concrete reaches the requirement of form removal intensity, wooden baffle, embedded pipe and to drawing the screw rod, standardized operation need not to demolish usually that side's pipe is next floor construction can continue to use, but with the article of reutilization wash the recovery for used repeatedly such as to drawing screw rod, embedded pipe and wooden baffle, square pipe and first nut only need install once when constructing the house first floor, need not to dismantle and reinstall when constructing the follow-up standardized floor, reduced intensity of labour.
Compared with the prior art, the invention has the following advantages:
1. the invention has simple and reasonable design, convenient operation and good use effect, can effectively improve the accuracy of the preformed hole construction during the construction of the high-rise standardized building, improves the installation efficiency of the later-stage water supply and drainage pipeline, effectively prevents the waste of manpower and financial resources due to the later-stage reworking, and can be popularized and used.
2. The invention is suitable for the existing very common aluminum alloy template, can shorten the construction period, avoid damaging the aluminum alloy template, save resources and effectively improve economic benefits.
3. The square tube, the embedded tube, the wooden baffle, the screw cap and the split screw designed and manufactured by the invention can be repeatedly used for many times, so that the material can be effectively saved, the cost can be saved, the labor intensity of workers can be reduced, the environment can be protected, and the basic requirements of energy conservation and emission reduction in China can be met.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a flow chart of the operation of the present invention.
Fig. 2 is a schematic front sectional view of the mold according to the present invention.
FIG. 3 is a schematic top view of the connection structure between the square pipe, the embedded pipe and the opposite-pulling screw rod according to the present invention.
Description of reference numerals:
1, pre-burying a pipe; 2, square tube; 3-a top plate;
4-oppositely pulling the screw rod; 5, self-tapping; 6-a first nut;
7-a second nut; 8-wooden baffle.
Detailed Description
The aluminum alloy formwork top plate water supply and drainage hole reserving die and the construction technology are applied to construction of a Baolixi mountain forest language C8# building in Wulu wood city, the residential building is integrally designed to have 2 underground layers, 27 above ground layers, the total building height is 78.6m, the standard layer height is 2.9m, and aluminum alloy formwork construction is adopted. The peripheral wall body of this building design is comparatively simple, and 13 layers and 20 layers have twice wall and roof beam changes that contract, and 1cm or 2cm wall and roof beam contract that contract, and 13 layers cross-section variation ranges are great. Aiming at the change of the section of the project of 1cm and 2cm, the shear wall changes the internal corner C groove at the internal corner to process the change of the wall length, changes the head plate to process the change of the wall thickness, changes the beam bottom plate to process the change of the beam section, and adopts the floor internal corner replacement or the floor plate replacement to process the floor plate. And the construction problem introduced in the technical background exists in the water supply and drainage construction of the aluminum alloy template roof, and each floor of the residential building is provided with 124 water supply and drainage reserved holes, so that the number of the floors is large, and the construction difficulty is brought.
As shown in fig. 2, the hole die is reserved for water supply and drainage of an aluminum alloy template top plate in this embodiment, and is characterized by comprising a square pipe 2, a pre-embedded pipe 1 and a counter-pull screw rod 4, wherein the square pipe 2 is fixedly connected to an aluminum alloy template top plate 3 through a self-tapping screw 5, the pre-embedded pipe 1 is arranged outside the square pipe 2, the inner wall of the pre-embedded pipe 1 is tangent to the square pipe 2, the counter-pull screw rod 4 is arranged on a vertical central axis of the square pipe 2 in a penetrating manner, a first through hole of a phi 16 is formed in the square pipe 2 through an electric drill, a first nut 6 is welded on the first through hole, the phi 14 of the square pipe 2 is connected with the counter-pull screw rod 4 through an internal thread of the first nut 6, a wooden baffle 8 is arranged at an opening at the upper end of the pre-embedded pipe 1, the counter-pull screw rod 4 penetrates through the.
As shown in fig. 1, the construction method for reserving holes for water supply and drainage of the aluminum alloy formwork top plate provided by the embodiment specifically includes the following steps:
s1, positioning a prepared hole: after the aluminum alloy formwork 3 of the house floor is erected, the central points of a plurality of circular drainage preformed holes are positioned on the aluminum alloy formwork top plate 3 according to a construction drawing, accurate preformed hole outlines are drawn by using a striking oil pen according to the positioned preformed hole central points and the preformed hole design radiuses, the diameters of water supply and drainage pipes designed by the drawing are DN50, DN100, DN110 and the like, and the diameter of each preformed hole is 25mm larger than that of the water supply and drainage pipe designed by the drawing;
s2, manufacturing a pre-buried pipe 1 and a square pipe 2: manufacturing an embedded pipe 1 for forming the preformed hole, wherein the embedded pipe 1 is made of cast iron, the outer diameter of the embedded pipe 1 is equal to the diameter of the preformed hole, the axial length of the embedded pipe 1 is 50mm larger than the thickness of a floor slab, demoulding is facilitated, a square pipe 2 internally tangent and fixed with the inner wall of the embedded pipe 1 is manufactured according to the inner diameter of the embedded pipe 1, the central point, namely a diagonal intersection point, is marked on the upper surface and the lower surface of the square pipe 2 opposite to each other, and the surface of the marked central point on the square pipe 2 is a horizontal end surface vertical to the vertical central line of the preformed hole;
s3, positioning and fixing the square tube 2: fixing the square tube 2 on a bottom plate of an aluminum alloy template 3 through self-tapping 5, ensuring that a central line formed by two central points at the mark position of the square tube 2 is superposed with a central line of a reserved hole, and forming a first through hole of phi 16 along the central line of the square tube 2 by using an electric drill;
s4, mounting and fixing the first nut 6: welding and fixing a first nut 6 matched with the phi 14 split screw in model on the square tube 2 through spot welding, and ensuring that the central line of the first nut 6 is superposed with the central line of a first through hole formed in the square tube 2;
s5, installing the counter-pulling screw rod 4: screwing a counter-pulling screw rod 4 of phi 14 into a first nut 6, wherein the counter-pulling screw rod 4 is in threaded connection with the first nut 6, and the model of the counter-pulling screw rod 4 is usually smaller than that of the first through hole by one model, so that the counter-pulling screw rod 4 can be conveniently penetrated and fixed;
s6, positioning and placing the embedded pipe 1: placing the embedded pipe 1 at the position of the reserved hole drawn in the S1, ensuring that the inner wall of the embedded pipe 1 is internally tangent to the two end faces of the square pipe 2 at the horizontal position, positioning and fixing the embedded pipe 1 by the square pipe 2, and coating a release agent on the outer wall of the embedded pipe 1;
s7, fixing the counter-pulling screw rod 4: as shown in fig. 2 and 3, a wooden baffle 8 is arranged at an opening end of a pre-buried pipe 1, a second through hole for penetrating through a counter-pull screw rod 4 is formed in the wooden baffle 8, one end face of the wooden baffle 8 plugs the opening of the pre-buried pipe 1 to prevent concrete from entering the pre-buried pipe 1 when the concrete is poured, the other end face of the wooden baffle 8 is fixed on the counter-pull screw rod 4 through a second nut 7, the counter-pull screw rod 4 is kept perpendicular when the second nut 7 is screwed, secondary correction is performed on the position of the pre-buried pipe 1, and a square pipe 2, the pre-buried pipe 1, the wooden baffle 8 and the counter-pull screw rod 4 are fixedly connected together through a first nut 6 and a second nut 7;
s8, pouring concrete: pouring concrete on the aluminum alloy template top plate 3, arranging a specially-assigned person to observe the verticality of the counter-pulling screw rod 4 at any time in the pouring process, and immediately correcting the deviation if the deviation exists;
s9, demolding: demolish second nut 7, wooden baffle 8, pre-buried pipe 1 and split screw 4 in proper order after the concrete reaches the requirement of form removal intensity, but the article washing recovery of reutilization is for used repeatedly, and square pipe 2 and first nut 6 only need install once when the first floor construction in the house, and direct use need not the extravagant man-hour of repeated dismantlement installation when the construction of follow-up standardized floor.
And (3) carrying out engineering quality assessment after construction is completed and acceptance is checked: the qualification rate of the reserved hole for water supply and drainage is improved from 76% to 98%, the quality is obviously improved, and great convenience and benefit are brought to the construction of water supply and drainage installation engineering in the later period. The project participates in the third-party inspection in the local production company, the quality of the reserved holes for water supply and drainage is obviously improved, the quality risk item is improved, and the total score is improved.
And (3) carrying out economic benefit statistical analysis after construction is completed: the total investment cost for one time comprises: material fees, labor fees (included in labor fees), and machine fees (included in labor fees). Holes are reserved by adopting iron pipes, the cost of each embedded pipe is 10 yuan, and the total cost of the embedded pipes is 1240 yuan. The chiseling and repairing of the reserved hole are greatly reduced in the later stage water supply and drainage installation process, 1 person working day is saved on each layer, 27 working days are saved totally, 180 yuan is saved in each working day, and 4860 yuan is saved in cost. After the hole is reserved, the embedded pipe can use a residual waste pipe of pipeline construction, and the cost of casing steel is saved by 1240 yuan. The cost is saved, the labor cost is saved, the material cost is saved by the sleeve, the total one-time investment cost is 4860, 1240 and 1240, the 4860 yuan, and the single layer directly generates the 4860 yuan economic benefit. And each layer is constructed under the premise that construction conditions are not changed. The water supply and drainage reserved hole shaping die is adopted for water heating reserved hole construction, the construction period of each layer of construction period ld can be saved by 27 days, and the daily lease cost, the mechanical idle cost and the labor cost of other work types are 7000 yuan. The mould has low manufacturing cost and high construction efficiency, can be recycled after being used, and can reduce the construction cost to the maximum extent; and the installation position is accurate, the problem of displacement of the installation reserved hole is avoided, the operation is simple and convenient, and the construction cost is reduced.
In conclusion, if the invention can be widely used in the construction of the aluminum alloy template, the construction quality can be obviously improved, the construction period can be shortened, the working efficiency can be improved, the resources can be saved, and the social benefit can be increased.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (3)
1. A die for reserving holes for water supply and drainage of an aluminum alloy template top plate is characterized by comprising a square tube (2), a pre-buried tube (1) and a split screw (4), the square pipe (2) is fixedly connected to the aluminum alloy template top plate (3) through a self-tapping (5), the embedded pipe (1) is arranged on the outer side of the square pipe (2), the inner wall of the embedded pipe (1) is tangent to the square pipe (2), the split screw (4) is arranged on the vertical central axis of the square pipe (2) in a penetrating way, the split screw (4) is in threaded connection with a first nut (6), the first nut (6) is welded and fixed on the square pipe (2), a wooden baffle (8) is arranged at an opening at the upper end of the embedded pipe (1), the counter-pulling screw rod (4) penetrates through the wooden baffle (8), and a second screw cap (7) used for fixing the wooden baffle (8) is arranged on the opposite-pulling screw rod (4).
2. The construction method for the reserved holes for water supply and drainage of the aluminum alloy template top plate is characterized by comprising the following operation steps of:
s1, positioning a prepared hole: after the aluminum alloy formwork of the building floor is erected, positioning the central points of a plurality of circular water supply and drainage preformed holes on a top plate (3) horizontally arranged in the aluminum alloy formwork according to a construction drawing, accurately drawing the preformed holes according to the positioned central points of the preformed holes and the design radius of the preformed holes, wherein the diameter of the drawn preformed holes is larger than that of the water supply and drainage pipes designed by the drawing;
s2, manufacturing the embedded pipe (1) and the square pipe (2): manufacturing a pre-buried pipe (1) for forming the preformed hole according to a drawing, manufacturing a square pipe (2) internally tangent and fixed with the inner wall of the pre-buried pipe (1) according to the inner diameter of the pre-buried pipe (1), marking a central point on two opposite surfaces of the square pipe (2), wherein the surface of the square pipe (2) marked with the central point is a horizontal end surface vertical to the vertical central line of the preformed hole;
s3, positioning and fixing the square pipe (2): fixing the square pipe (2) on the aluminum alloy template top plate (3) through self-tapping (5), ensuring that the central line formed by two central points marked by the square pipe (2) is superposed with the central line of a reserved hole, and forming a first through hole along the central line of the square pipe (2) by using an electric drill;
s4, mounting and fixing a first nut (6): fixing a first nut (6) on the square pipe (2) by spot welding to ensure that the central line of the first nut (6) is superposed with the central line of a first through hole formed in the square pipe (2);
s5, installing a counter-pulling screw rod (4): selecting a counter-pulling screw rod (4) with a corresponding model through the aperture of the first through hole and the model of the first screw cap (6), and screwing the counter-pulling screw rod (4) into the first screw cap (6);
s6, positioning and placing the embedded pipe: placing the embedded pipe (1) according to the position of the preformed hole drawn in the S1, ensuring that the inner wall of the embedded pipe (1) is internally tangent to the two end faces of the square pipe (2) which are positioned at the horizontal position, and coating a release agent on the outer wall of the embedded pipe (1);
s7, fixing the counter-pulling screw (4): the method comprises the following steps that a wood baffle (8) used for preventing concrete from entering the embedded pipe (1) during concrete pouring is arranged on the embedded pipe (1), a second through hole used for penetrating through a counter-pulling screw rod (4) is formed in the wood baffle (8), a second nut (7) used for fixing the wood baffle (8) at an opening at the top end of the embedded pipe (1) is connected to the counter-pulling screw rod (4) in a threaded mode, the counter-pulling screw rod (4) is kept perpendicular when the second nut (7) is screwed down, and secondary correction is conducted on the position of the embedded pipe (1);
s8, pouring concrete: pouring concrete on the aluminum alloy template top plate (3), observing the verticality of the counter-pulling screw rod (4) constantly in the pouring process, and immediately correcting the deviation if the deviation exists;
s9, demolding: and after the concrete meets the requirement of form removal strength, the second screw cap (7), the wooden baffle (8), the embedded pipe (1) and the counter-pulling screw (4) are sequentially removed.
3. The construction method for reserving the hole for water supply and drainage of the aluminum alloy template top plate according to claim 2, wherein the height of the embedded pipe (1) is more than 50mm higher than the concrete forming surface; the embedded pipe (1) is a metal pipe.
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Publication number | Priority date | Publication date | Assignee | Title |
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CN113958125A (en) * | 2020-12-24 | 2022-01-21 | 中铁大桥局集团第六工程有限公司 | Pore-forming device and pore-forming method for prestressed steel beam preformed hole |
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