CN110714481A - Construction method for prefabricated assembly type power pipe gallery - Google Patents

Construction method for prefabricated assembly type power pipe gallery Download PDF

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Publication number
CN110714481A
CN110714481A CN201910758202.5A CN201910758202A CN110714481A CN 110714481 A CN110714481 A CN 110714481A CN 201910758202 A CN201910758202 A CN 201910758202A CN 110714481 A CN110714481 A CN 110714481A
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China
Prior art keywords
pipe gallery
power pipe
template
construction
waterproof
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Application number
CN201910758202.5A
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Chinese (zh)
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CN110714481B (en
Inventor
李云雷
史红伟
冯鹏鹏
刘鑫宇
宋永华
隗磊
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Sinohydro Bureau 11 Co Ltd
Powerchina 11th Bureau Engineering Co Ltd
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Sinohydro Bureau 11 Co Ltd
Powerchina 11th Bureau Engineering Co Ltd
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Priority to CN201910758202.5A priority Critical patent/CN110714481B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/08Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/087Producing shaped prefabricated articles from the material by vibrating or jolting by means acting on the mould ; Fixation thereof to the mould
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00Producing shaped prefabricated articles from the material
    • B28B1/08Producing shaped prefabricated articles from the material by vibrating or jolting
    • B28B1/093Producing shaped prefabricated articles from the material by vibrating or jolting by means directly acting on the material, e.g. by cores wholly or partly immersed in the material or elements acting on the upper surface of the material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B23/00Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
    • B28B23/02Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B28WORKING CEMENT, CLAY, OR STONE
    • B28BSHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00Moulds; Cores; Mandrels
    • B28B7/38Treating surfaces of moulds, cores, or mandrels to prevent sticking
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/08Sinking workpieces into water or soil inasmuch as not provided for elsewhere
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G9/00Installations of electric cables or lines in or on the ground or water
    • H02G9/02Installations of electric cables or lines in or on the ground or water laid directly in or on the ground, river-bed or sea-bottom; Coverings therefor, e.g. tile
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete

Abstract

The invention relates to the technical field of infrastructure engineering, in particular to a construction method of a prefabricated assembly type power pipe gallery. The method comprises the following steps: binding a power pipe gallery steel frame; step two, pedestal construction; step three, installing a template; step four, pouring concrete; fifthly, transporting the power pipe gallery; sixthly, installing the power pipe gallery; seventhly, performing waterproof construction outside the power pipe gallery; and step eight, backfilling the pipe gallery. The construction method effectively accelerates the turnover efficiency of the pipe culvert prefabricating and shaping steel die and accelerates the prefabrication efficiency of the pipe culvert. Effectively quickening the installation efficiency of the pipe culvert and ensuring the installation quality of two adjacent pipe galleries.

Description

Construction method for prefabricated assembly type power pipe gallery
Technical Field
The invention relates to the technical field of infrastructure engineering, in particular to a construction method of a prefabricated assembly type power pipe gallery.
Background
The construction of synthesizing electric power piping lane all adopts traditional cast-in-place construction mode at present, needs more constructor manpower cooperation in this kind of work progress, because the manpower construction link is more, the construction cost of engineering is high, the efficiency of construction is lower, the uncontrollable factor of quality of construction is more.
But in today's society, efficiency and quality are critical to businesses. Under the development trend of mechanization and automation, the traditional cast-in-place construction mode has the problems of high construction cost, high labor intensity and low construction efficiency, and cannot better adapt to the requirements of modern construction.
Disclosure of Invention
The invention provides a construction method of a prefabricated assembly type power pipe gallery, and aims to solve the problems of high construction cost, high labor intensity and low construction efficiency of the power pipe gallery in the traditional construction process.
The invention discloses a construction method of a prefabricated assembly type power pipe gallery, which adopts the following technical scheme: a construction method for a prefabricated assembly type power pipe gallery comprises the following steps:
step one, binding a steel frame of the power pipe gallery: binding reinforcing steel bars of the power pipe gallery by using galvanized steel pipes as a framework and using deformed steel bars as a bracket;
step two, pedestal construction: the construction of the electric power pipe gallery adopts a pedestal and mould separated design, the existing templates are combined, pedestals are arranged, the pedestals are arranged in two rows, the two rows of pedestals are transversely arranged at intervals, a steel template is installed when the pedestals are poured, the top elevation of the template is leveled by using a level gauge, counter pull rods and inclined struts are arranged on the template, steel plates are placed on the surface of the pedestals, and the welding is firm by using electric welding;
step three, template installation: after the on-site mold is qualified, the mold is firstly polished by a steel wire brush, then is coated with cement mortar for polishing, and then is coated with the cement mortar for polishing, and then is circularly polished in sequence, and is subjected to oxidation treatment after polishing, the template is assembled according to a drawing, double-sided sponge rubber strips are adhered to joints of the template, and a layer of special release agent needs to be uniformly coated on a steel template; the template is installed by lifting the template by a gantry crane and manually matching the template in place; the template connection adopts bolt fixation, the top and the bottom of the inner template and the outer template adopt high-strength pull rods to fix the inner support and the template truss for positioning, after the templates are installed and formed, the position of the templates is corrected by longitudinal and transverse axes, the verticality of the templates is corrected by a plumb bob, and a lifting appliance is reserved at the position of a template lifting hole;
step four, pouring concrete: adopting a gantry crane to lift a hopper for layered pouring, stopping pouring after the bottom concrete pouring is finished, adopting an inserted vibrator for vibrating, and installing a bottom template when the bottom concrete surface is flat and has slurry, does not sink and has no bubbles; after the bottom formwork is installed, pouring the side surface and the top plate, wherein the two ends are symmetrical, layered pouring is carried out, the thin layer of the inclined surface is pushed, an attached high-frequency vibrator and an inserted vibrating rod are combined, the lower layer concrete is inserted for 50-100 mm during vibrating, and each vibrating part needs to be vibrated until the concrete at the vibrating part is compact, namely no air bubble is generated;
step five, transporting the power pipe gallery: hoisting the power pipe gallery by using a crawler crane, before hoisting, performing waterproof treatment on a socket by using the power pipe gallery, fixing a hoisting tool firstly during hoisting, slowly hoisting, standing for two minutes at a position 200mm away from the ground, slowly moving to a position right above the center of a waterproof base plane of the power pipe gallery after the power pipe gallery is stable, standing for two minutes, vertically dropping a component after the power pipe gallery is stable, stopping dropping at a position 200mm away from the waterproof base plane on the bottom surface of the power pipe gallery, adjusting the direction of the power pipe gallery, and after ensuring that bell sockets of the power pipe gallery are aligned, finely adjusting the power pipe gallery by using a manual hoist to control the central line and the elevation of an inner bottom of a box culvert; the method comprises the following steps of ensuring that tensioning channels reserved at four corners of the power pipe gallery are aligned, and after the tensioning channels reserved at the four corners are aligned, additionally arranging temporary supports on the inner walls of joints of adjacent power pipe galleries to be tensioned to fix the inner walls of the adjacent power pipe galleries to be tensioned, so that the inner walls of the two adjacent power pipe galleries are smooth; then tensioning pore channels at four corners of the power pipe gallery to perform steel strand penetrating and anchoring the front end in advance;
step six, installing the power pipe gallery: after the power pipe gallery is hoisted in place, firstly, tensioning the power pipe gallery for the first time after tensioning pore channels at four corners of the power pipe gallery are aligned, and detaching a lifting appliance after the four corners of the power pipe gallery are aligned and the bell and spigot are orthogonal; performing secondary tensioning, and when the width of a gap at the tensioning socket of the power pipe gallery reaches 20mm, performing locking treatment on the rear end of the anchorage device to cut off redundant steel strands;
seventhly, waterproof construction outside the power pipe gallery: waterproof introduction of anti-freezing waterproof mortar outside the power pipe gallery, waterproof construction of a surface layer by adopting the waterproof mortar, construction of a tensioning groove on the inner side of the power pipe gallery in three times, sealing mortar, namely the waterproof mortar is mixed with water and cannot leak to be sealed, and polysulfide sealant is filled in a joint of a bell and spigot by adopting a glue dispenser;
step eight, backfilling the pipe gallery: the foam board is pasted on the waterproof layer surface, the bilateral symmetry is backfilled, the box culvert is guaranteed not to displace, and the connection of adjacent sections leaves steps to guarantee that the pipe culvert is backfilled in place.
In the second step, 30 pedestals are arranged in the prefabricating area, and the distance between two adjacent rows of pedestals is two meters.
In the third step, the slump of the concrete of the pipe gallery needs to be controlled between 140mm and 180 mm. The layered thickness is 300 mm-400 mm. The phi 50 inserted vibrator is adopted, the vibration interval does not exceed 1.5 times of the action radius of the vibrating rod, and the distance between the vibrator and the side die is kept between 50mm and 100 mm.
In the fourth step, the ST water stop adhesive tape stuck on the socket has the top width of 20mm, the bottom width of 22mm, the thickness of 20mm, the width of the micro-expansion rubber strip of 15mm and the thickness of 20 mm.
In the fifth step, the length of the handle rod is selected to be 35.6m and the working radius is selected to be 26m in the first-stage slope section and the second-stage slope section, so that the single-machine crawler crane with the lifting capacity of 20.1t is adopted, and the length of the handle rod in the first-stage groove and the second-stage groove is selected to be 41.2m and the working radius is selected to be 36m, so that the single-machine crawler crane with the lifting capacity of 21t is adopted.
In the seventh step, the waterproof mortar is doped with water in the following proportion: cement: river sand: the alloy powder is 1.04: 1: 2.5:0.05, adhering small stainless steel hooks on two sides of the joint by 107 glue, paving a galvanized steel wire mesh with the width of 50cm and the mesh size of 800, increasing the bonding strength and preventing settlement and separation.
The invention has the beneficial effects that: the standard and specification of the binding of the steel bars of the pipe culvert are ensured. Effectively quickening the turnover efficiency of the pipe culvert prefabricating and shaping steel die and quickening the prefabricating efficiency of the pipe culvert. Effectively quickening the installation efficiency of the pipe culvert and ensuring the installation quality of two adjacent pipe galleries. The construction of the external water-proof of the pipe culvert is efficiently finished, a better effect is obtained, and the construction method is approved by all parties involved in construction. The timing of the backfilling of the pipe culvert is mastered, the machines and tools which are beneficial to the backfilling of the pipe culvert are summarized, and the water resistance outside the constructed pipe culvert is effectively protected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flow chart of a prefabricated assembled power pipe gallery construction method of the present invention;
fig. 2 is a schematic diagram of a project with two levels of slopes.
In the figure: 1. a crawler crane; 2. a spreader; 3. a first grade slope section; 4. a second grade slope section; 5. a transport vehicle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention relates to a construction method of a prefabricated assembly type power pipe gallery, which comprises the following steps:
step one, binding a steel frame of the power pipe gallery: binding reinforcing steel bars of the power pipe gallery by using galvanized steel pipes as a framework and using deformed steel bars as a bracket; the deformed steel bar adopts deformed steel bar with the diameter of 16, and the standard, quick and accurate manufacturing effect of the binding of the steel bar of the pipe culvert is realized.
Step two, pedestal construction: the construction of the electric power pipe gallery adopts a pedestal and mould separated design, the existing templates are combined, pedestals are arranged, the pedestals are arranged in two rows, the two rows of pedestals are transversely arranged at intervals, a steel template is installed when the pedestals are poured, the top elevation of the template is leveled by using a level gauge, counter pull rods and inclined struts are arranged on the template, steel plates are placed on the surface of the pedestals, and the welding is firm by using electric welding; the steps optimize the template through analyzing the advantages and the disadvantages of the integral steel mould with the base and the base separating template, improve the turnover work efficiency of the template and accelerate the prefabrication progress of the pipe culvert.
Step three, template installation: after the on-site mold is qualified, the mold is firstly polished by a steel wire brush, then is coated with cement mortar for polishing, and then is coated with the cement mortar for polishing, and then is circularly polished in sequence, and is subjected to oxidation treatment after polishing, the template is assembled according to a drawing, double-sided sponge rubber strips are adhered to joints of the template, and a layer of special release agent needs to be uniformly coated on a steel template; the template is installed by lifting the template by a gantry crane and manually matching the template in place; the template connection adopts bolt fixation, the top and the bottom of the inner template and the outer template adopt high-strength pull rods to fix the inner support and the template truss for positioning, after the templates are installed and formed, the position of the templates is corrected by longitudinal and transverse axes, the verticality of the templates is corrected by a plumb bob, and a lifting appliance is reserved at the position of a template lifting hole; the high-strength pull rod is a T20 high-strength pull rod. The lifting appliance adopts four lifting appliances 2 with the weight of five tons.
Step four, pouring concrete: adopting a gantry crane to lift a hopper for layered pouring, stopping pouring after the bottom concrete pouring is finished, adopting an inserted vibrator for vibrating, and installing a bottom template when the bottom concrete surface is flat and has slurry, does not sink and has no bubbles; after the bottom formwork is installed, pouring the side surface and the top plate, wherein the two ends are symmetrical, layered pouring is carried out, the thin layer of the inclined surface is pushed, an attached high-frequency vibrator and an inserted vibrating rod are combined, the lower layer concrete is inserted for 50-100 mm during vibrating, and each vibrating part needs to be vibrated until the concrete at the vibrating part is compact, namely no air bubble is generated;
step five, transporting the power pipe gallery: hoisting the power pipe gallery by using a crawler crane, before hoisting, performing waterproof treatment on a socket by using the power pipe gallery, fixing a hoisting tool firstly during hoisting, slowly hoisting, standing for two minutes at a position 200mm away from the ground, slowly moving to a position right above the center of a waterproof base plane of the power pipe gallery after the power pipe gallery is stable, standing for two minutes, vertically dropping a component after the power pipe gallery is stable, stopping dropping at a position 200mm away from the waterproof base plane on the bottom surface of the power pipe gallery, adjusting the direction of the power pipe gallery, and after ensuring that bell sockets of the power pipe gallery are aligned, finely adjusting the power pipe gallery by using a manual hoist to control the central line and the elevation of an inner bottom of a box culvert; the method comprises the following steps of ensuring that tensioning channels reserved at four corners of the power pipe gallery are aligned, and after the tensioning channels reserved at the four corners are aligned, additionally arranging temporary supports on the inner walls of joints of adjacent power pipe galleries to be tensioned to fix the inner walls of the adjacent power pipe galleries to be tensioned, so that the inner walls of the two adjacent power pipe galleries are smooth; then tensioning pore channels at four corners of the power pipe gallery to perform steel strand penetrating and anchoring the front end in advance;
step six, installing the power pipe gallery: after the power pipe gallery is hoisted in place, firstly, tensioning the power pipe gallery for the first time after tensioning pore channels at four corners of the power pipe gallery are aligned, and detaching a lifting appliance after the four corners of the power pipe gallery are aligned and the bell and spigot are orthogonal; performing secondary tensioning, and when the width of a gap at the tensioning socket of the power pipe gallery reaches 20mm, performing locking treatment on the rear end of the anchorage device to cut off redundant steel strands;
seventhly, waterproof construction outside the power pipe gallery: waterproof introduction of anti-freezing waterproof mortar outside the power pipe gallery, waterproof construction of a surface layer by adopting the waterproof mortar, construction of a tensioning groove on the inner side of the power pipe gallery in three times, sealing mortar, namely the waterproof mortar is mixed with water and cannot leak to be sealed, and polysulfide sealant is filled in a joint of a bell and spigot by adopting a glue dispenser;
step eight, backfilling the pipe gallery: the foam board is pasted on the waterproof layer surface, the bilateral symmetry is backfilled, the box culvert is guaranteed not to displace, and the connection of adjacent sections leaves steps to guarantee that the pipe culvert is backfilled in place.
Further, in the second step, 30 pedestals are arranged in the prefabricating area, and the distance between two adjacent rows of pedestals is two meters.
Furthermore, in the third step, the concrete slump of the pipe gallery is controlled to be 140 mm-180 mm. The layered thickness is 300 mm-400 mm. The phi 50 inserted vibrator is adopted, the vibration interval does not exceed 1.5 times of the action radius of the vibrating rod, and the distance between the vibrator and the side die is kept between 50mm and 100 mm.
Furthermore, in the fourth step, the width of the top of the ST water stop adhesive tape stuck on the socket is 20mm, the width of the bottom of the ST water stop adhesive tape is 22mm, the thickness of the ST water stop adhesive tape is 20mm, the width of the micro-expansion rubber strip is 15mm, and the thickness of the ST water stop adhesive tape is 20 mm.
Further, in the fifth step, the length of the rod of the crawler crane with the single crane lifting capacity of 20.1t is selected to be 35.6m and the working radius is selected to be 26m in the first-stage slope section 3 and the second-stage slope section 4, the length of the rod of the crawler crane with the single crane lifting capacity of 21t is selected to be 41.2m and the working radius is selected to be 36m in the first-stage slope section 3 and the second-stage slope section 4.
In the seventh step, the waterproof mortar is doped with water in the following proportion: cement: river sand: the alloy powder is 1.04: 1: 2.5:0.05, adhering small stainless steel hooks on two sides of the joint by 107 glue, paving a galvanized steel wire mesh with the width of 50cm and the mesh size of 800, increasing the bonding strength and preventing settlement and separation.
The transport vehicle 5 is parked on the side opposite to the crawler crane 1.
The invention has the beneficial effects that: the standard and the specification of the binding of the steel bars of the pipe culvert are ensured, the turnover efficiency of the prefabricated shaping steel die of the pipe culvert is effectively accelerated, and the prefabrication efficiency of the pipe culvert is accelerated. Effectively quickening the installation efficiency of the pipe culvert and ensuring the installation quality of two adjacent pipe galleries. The construction of the external water-proof of the pipe culvert is efficiently finished, a better effect is obtained, and the construction method is approved by all parties involved in construction. The timing of the backfilling of the pipe culvert is mastered, the machines and tools which are beneficial to the backfilling of the pipe culvert are summarized, and the water resistance outside the constructed pipe culvert is effectively protected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A construction method for a prefabricated assembly type power pipe gallery comprises the following steps:
step one, binding a steel frame of the power pipe gallery: binding reinforcing steel bars of the power pipe gallery by using galvanized steel pipes as a framework and using deformed steel bars as a bracket;
step two, pedestal construction: the construction of the electric power pipe gallery adopts a pedestal and mould separated design, the existing templates are combined, pedestals are arranged, the pedestals are arranged in two rows, the two rows of pedestals are transversely arranged at intervals, a steel template is installed when the pedestals are poured, the top elevation of the template is leveled by using a level gauge, counter pull rods and inclined struts are arranged on the template, steel plates are placed on the surface of the pedestals, and the welding is firm by using electric welding;
step three, template installation: after the on-site mold is qualified, the mold is firstly polished by a steel wire brush, then is coated with cement mortar for polishing, and then is coated with the cement mortar for polishing, and then is circularly polished in sequence, and is subjected to oxidation treatment after polishing, the template is assembled according to a drawing, double-sided sponge rubber strips are adhered to joints of the template, and a layer of special release agent needs to be uniformly coated on a steel template; the template is installed by lifting the template by a gantry crane and manually matching the template in place; the template connection adopts bolt fixation, the top and the bottom of the inner template and the outer template adopt high-strength pull rods to fix the inner support and the template truss for positioning, after the templates are installed and formed, the position of the templates is corrected by longitudinal and transverse axes, the verticality of the templates is corrected by a plumb bob, and a lifting appliance is reserved at the position of a template lifting hole;
step four, pouring concrete: adopting a gantry crane to lift a hopper for layered pouring, stopping pouring after the bottom concrete pouring is finished, adopting an inserted vibrator for vibrating, and installing a bottom template when the bottom concrete surface is flat and has slurry, does not sink and has no bubbles; after the bottom formwork is installed, pouring the side surface and the top plate, wherein the two ends are symmetrical, layered pouring is carried out, the thin layer of the inclined surface is pushed, an attached high-frequency vibrator and an inserted vibrating rod are combined, the lower layer concrete is inserted for 50-100 mm during vibrating, and each vibrating part needs to be vibrated until the concrete at the vibrating part is compact, namely no air bubble is generated;
step five, transporting the power pipe gallery: hoisting the power pipe gallery by using a crawler crane, before hoisting, performing waterproof treatment on a socket by using the power pipe gallery, fixing a hoisting tool firstly during hoisting, slowly hoisting, standing for two minutes at a position 200mm away from the ground, slowly moving to a position right above the center of a waterproof base plane of the power pipe gallery after the power pipe gallery is stable, standing for two minutes, vertically dropping a component after the power pipe gallery is stable, stopping dropping at a position 200mm away from the waterproof base plane on the bottom surface of the power pipe gallery, adjusting the direction of the power pipe gallery, and after ensuring that bell sockets of the power pipe gallery are aligned, finely adjusting the power pipe gallery by using a manual hoist to control the central line and the elevation of an inner bottom of a box culvert; the method comprises the following steps of ensuring that tensioning channels reserved at four corners of the power pipe gallery are aligned, and after the tensioning channels reserved at the four corners are aligned, additionally arranging temporary supports on the inner walls of joints of adjacent power pipe galleries to be tensioned to fix the inner walls of the adjacent power pipe galleries to be tensioned, so that the inner walls of the two adjacent power pipe galleries are smooth; then tensioning pore channels at four corners of the power pipe gallery to perform steel strand penetrating and anchoring the front end in advance;
step six, installing the power pipe gallery: after the power pipe gallery is hoisted in place, firstly, tensioning the power pipe gallery for the first time after tensioning pore channels at four corners of the power pipe gallery are aligned, and detaching a lifting appliance after the four corners of the power pipe gallery are aligned and the bell and spigot are orthogonal; performing secondary tensioning, and when the width of a gap at the tensioning socket of the power pipe gallery reaches 20mm, performing locking treatment on the rear end of the anchorage device to cut off redundant steel strands;
seventhly, waterproof construction outside the power pipe gallery: waterproof introduction of anti-freezing waterproof mortar outside the power pipe gallery, waterproof construction of a surface layer by adopting the waterproof mortar, construction of a tensioning groove on the inner side of the power pipe gallery in three times, sealing mortar, namely the waterproof mortar is mixed with water and cannot leak to be sealed, and polysulfide sealant is filled in a joint of a bell and spigot by adopting a glue dispenser;
step eight, backfilling the pipe gallery: the foam board is pasted on the waterproof layer surface, the bilateral symmetry is backfilled, the box culvert is guaranteed not to displace, and the connection of adjacent sections leaves steps to guarantee that the pipe culvert is backfilled in place.
2. The prefabricated assembled power pipe gallery construction method according to claim 1, wherein: in the second step, 30 pedestals are arranged in the prefabricating area, and the distance between two adjacent rows of pedestals is two meters.
3. The prefabricated assembled power pipe gallery construction method according to claim 2, wherein: in the third step, the slump of the pipe gallery concrete is controlled to be 140-180 mm, the layering thickness is 300-400 mm, a phi 50 inserted vibrator is adopted, the vibration interval does not exceed 1.5 times of the action radius of a vibrating rod, and the distance between the pipe gallery concrete and the side mold is kept to be 50-100 mm.
4. The prefabricated assembled power pipe gallery construction method according to claim 3, wherein: in the fourth step, the ST water stop adhesive tape stuck on the socket has the top width of 20mm, the bottom width of 22mm, the thickness of 20mm, the width of the micro-expansion rubber strip of 15mm and the thickness of 20 mm.
5. The prefabricated assembled power pipe gallery construction method according to claim 4, wherein: in the fifth step, the length of the rod is selected to be 35.6m and the working radius is selected to be 26m in the first-stage slope-releasing section and the second-stage slope-releasing section, so that the single-machine crawler crane with the lifting capacity of 20.1t is adopted, the length of the rod is selected to be 41.2m and the working radius is selected to be 36m in the first-stage groove and the second-stage groove, and the single-machine crawler crane with the lifting capacity of 21t is adopted.
6. The prefabricated assembled power pipe gallery construction method according to claim 5, wherein: in the seventh step, the waterproof mortar is doped with water in the following proportion: cement: river sand: the alloy powder is 1.04: 1: 2.5:0.05, adhering small stainless steel hooks on two sides of the joint by 107 glue, paving a galvanized steel wire mesh with the width of 50cm and the mesh size of 800, increasing the bonding strength and preventing settlement and separation.
CN201910758202.5A 2019-08-16 2019-08-16 Construction method for prefabricated assembly type power pipe gallery Active CN110714481B (en)

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CN110714481B CN110714481B (en) 2021-05-18

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