CN113006135A - Construction method of bare concrete for underground transformer substation - Google Patents
Construction method of bare concrete for underground transformer substation Download PDFInfo
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- CN113006135A CN113006135A CN202110227378.5A CN202110227378A CN113006135A CN 113006135 A CN113006135 A CN 113006135A CN 202110227378 A CN202110227378 A CN 202110227378A CN 113006135 A CN113006135 A CN 113006135A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
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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
- E04H5/04—Transformer houses; Substations or switchgear houses
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0007—Production methods using a mold
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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Abstract
The invention relates to a bare concrete construction process, in particular to a construction method of bare concrete for a full underground structure veneer. The invention adopts the following construction links of bare concrete: the improved process method effectively solves the problems of high difficulty and difficulty in controlling the appearance quality of the finish concrete construction of the whole underground structure, improves the purpose of one-time standard reaching of the finish concrete construction, timely controls and rechecks errors generated by the construction, shortens the construction period, saves the repair cost, and has high practicability and popularization value.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method of bare concrete for an underground substation.
Background
The fair-faced concrete is an expression technique of modern architecture, people pursue more various aesthetic feelings along with the increasing improvement of living standard of people, the fair-faced concrete directly adopts the natural surface effect of the concrete as a veneer without any procedures of coating, porcelain diamond pasting, stone pasting and the like, the surface has the most natural luster and the most decorative effect, the texture and the texture have simple, real, lusterless and natural and stable artistic effects, and the expression technique of the plain color of the concrete is expressed.
The fair-faced concrete has been popularized and applied to the field of industrial and civil fabricated buildings from cast-in-place projects of airports, roads, bridges and the like, and the demand of seeking refinement to the construction process of the fair-faced concrete is more and more prominent so as to meet the brief and environmental protection concept of modern social development. With the development of the times, the labor cost is higher and higher in the engineering cost, and a construction site timely detection project and method are required to be established, so that the quality of single coating is ensured, the recoating times are reduced, the maintenance cost of the whole life cycle of the fair-faced concrete is reduced, and the total construction cost of the engineering is reduced.
The excavation depth of the underground transformer substation is about 17-25 m generally, the engineering is a whole underground indoor transformer substation, the total depth reaches 11m, and the bearing of building load is large, so that the total station adopts a raft foundation, and the thickness reaches 1.3 m; meanwhile, in order to respond to the national regulations of energy conservation and consumption reduction, the basement main body structure engineering completely adopts a bare concrete construction process, so that wet operation and concrete surface plastering are reduced, the resource consumption is saved, and the engineering cost is reduced.
The bare concrete process is used as a main process of transformer substation engineering, has the obvious advantages of smooth surface, uniform color, simple and beautiful appearance and the like, but because the bare concrete has higher requirements on pouring quality, pouring appearance and the like, through field investigation on the construction condition of the bare concrete of the facing of a constructed underground transformer substation, the control on the surface flatness, surface bubbles, decorative eye design, template joints and smoothness is not ideal in the appearance control construction of the facing bare concrete. The construction quality control difficulty of the bare concrete structure is high, and how to carry out one-time survival of the concrete through a technical and quality management means under the high requirement of a construction unit becomes a great difficulty.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a construction method of bare concrete for an underground substation, solves the problem of high quality control difficulty of the traditional construction method, and mainly solves the following problems: firstly, the reinforcing strength of the template seam is insufficient; secondly, the decorative plug is unreasonable in type selection; and the flatness deviation of the template does not meet the requirement.
The invention is realized by adopting the following technical scheme, and the construction method of the bare concrete of the underground substation is implemented according to the following steps:
the method comprises the following steps: measuring and paying off;
step two: the steel bar is manufactured, rust-proof galvanized lead wires are adopted, binding heads are bent into the steel bar framework, contact with the template is avoided, and the appearance quality is ensured by adopting plastic cushion blocks with the colors consistent with the color of the template;
step three (1): selecting materials and designing a template, (a) adopting a mirror top level red template; (b) a flexible plastic decorative plug is adopted, and a 15mm sponge ring pad is attached to the surface of the decorative plug; (c) flexible plastics are adopted for pull screw holes of the fixed template, so that damage to the surface of concrete is reduced when the template is removed;
step three (2): testing and installing a template, (a) detecting by using a template flatness detector; (b) pre-installing templates according to engineering design drawings, numbering the templates, and ensuring that the templates can be placed in a seat in a number-checking manner and accurately positioned for use when being formally installed; (c) column molds, wall molds, beam molds and the like are hoisted, spliced and placed in place in sequence, sealing strips are clamped at the open seams and cicada seams, wall penetrating clamping bolts are installed, vertical template seams are reinforced by 3 wood beams, horizontal seams at the joints of new and old concrete are reinforced by 1 short wood beam on the basis of the original scheme, the contact area of the wood beams and the templates is increased, and the rigidity of a template supporting system is enhanced; (d) uniformly brushing a high-quality water-soluble release agent on the inner surface of the template, checking and accepting by a specially-assigned person after brushing the release agent, and performing the next procedure after the checking and accepting are qualified; (e) the rigidity and the precision of the template supporting system are adjusted by using a limiting device for the stress deformation of the template supporting system, so that the stress deformation quantity of the template supporting system is accurately limited;
step four: pouring fair-faced concrete, (a) adopting self-compacting concrete; (b) special vehicles and equipment are equipped for stirring and transporting concrete, so that the continuity of concrete pouring is ensured; (c) adopting a layered continuous pouring method, performing circulating pouring from the periphery to the center and from the center to the periphery, and performing press polish before initial setting of concrete after pouring is finished; (d) maintaining after pouring, and after pouring of the on-site clear water concrete is completed, timely maintaining the temperature by using geotextile for covering and maintaining;
step five: removing the template, namely loosening the removing clamp and the connecting bolt to separate the template from the concrete, horizontally pulling by using a hoist when the local concrete adsorbs or is adhered to the template, and hoisting after the template is completely separated from the wall;
step six: and (3) maintaining the finished product of the clear water concrete, performing heat preservation covering by using geotextile after pouring, wherein the coverage rate reaches 100%, starting watering maintenance after 12h, and continuously watering according to weather conditions to keep the wetting to be not less than 14 d.
Preferably, in the second step, the plastic cushion block is in two-point contact with the template, and the contact area does not exceed 2 square millimeters.
Preferably, the flatness deviation of the mirror top level red template in the step three (1) is less than 2 mm.
Preferably, the joint staggering allowable deviation of the contact area of the wood purlin and the template in the step three (2) is less than or equal to 2 m.
Preferably, when the layered continuous casting in the fourth step is performed, cement mortar with the thickness of 50mm is firstly cast at the root, then concrete materials are cast in layers, and the concrete materials are vibrated in layers, wherein the casting thickness of each layer of concrete is controlled within 40 cm.
Compared with the traditional fair-faced concrete construction technology, the invention has the advantages of good appearance and quality after the layered continuous pouring is finished, safety, reliability, quality guarantee and obvious benefit. The concrete beneficial effects are as follows:
1. and the visual experience is improved. The template with smaller flatness deviation, high strength, high hardness, plastic-plated surface finish and high flatness is selected and a self-made detection instrument is adopted, so that the template system is easy to assemble and disassemble, the joint is tight, the surface of the concrete after pouring is smooth, the one-step forming rate is high, the appearance effect of the fair-faced concrete is ensured, and the concept of green, environment-friendly and low-carbonization of the building is accurately conveyed.
2. And improving quality control. Through repeated tests of construction links on site, partial design and material selection are adjusted in time, the construction process is improved in a circulating mode, the awareness of managers on engineering quality management is improved, and a good foundation is laid for next optimization-creating work.
3. Shortening the construction period. Through carrying out the mode of pouring in succession layering, effectively shorten whole engineering construction cycle, raise the efficiency, save the whole cost of engineering.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the construction method of the bare concrete for the underground substation of the invention comprises the following specific construction steps:
the method comprises the following steps: measuring line
(a) In order to ensure the smooth and flat clear water effect of the surface, each layer of measurement and paying-off is carried out according to the following procedures of paying out a positioning axis → paying out a wall column side line and a control line according to the axis → finishing the erection of a wall column mould, checking the verticality and the upper opening position → paying out a beam plate elevation control line on the wall column mould → finishing the erection of the beam plate, checking the elevation and the smoothness of the upper opening and the lower opening → checking the sizes, the elevation, the integral cross ring and the positions of reinforcing steel bars of all components again before pouring concrete;
(b) in order to ensure the accurate sizes and elevations of all components, the paying-off work is responsible for excellent measurement engineers with abundant construction experience, and the main measuring instruments comprise a topokang-700 total station, a Leica automatic leveling level, a laser plummet and other auxiliary equipment;
(c) in order to prevent the generation of accumulated errors, an axis control point is arranged at a fixed position of each layer, and the control points are directly projected to a construction layer by using a theodolite; the elevation needs to be directly measured by a steel ruler according to the control point of the first floor, and one recheck is added on the basis of standard operation;
(d) the engineering is constructed in sections, the uniform circle intersection is achieved through one-step forming, measurement is used as a pilot process and starts before construction and needs to penetrate through all construction links, a measurement paying-off procedure is strictly formulated, careful measurement is carried out, mutual closing is carried out, and accurate basis is provided for engineering construction.
Step two: safety made of reinforcing steel bar
(a) The steel bar binding engineering is one of important items of structural engineering, the fixing position, the fixing interval, the binding method and the like of the steel bars can directly influence the engineering quality of the whole template, further influence the appearance of the fair-faced concrete, and the steel bars are uniformly processed and formed on site in order to ensure the accurate processing of the steel bars;
(b) in order to prevent the rust resistance of the steel bar material from influencing the appearance of the fair-faced concrete, 22# galvanized lead wires are adopted completely, all binding wire heads must be bent into the steel bar framework in the binding process and cannot contact with a template, the regulation is one of strict control standards of the project on the quality of the steel bar engineering, and a specially-assigned person is responsible for real-time inspection;
(c) the binding of the steel bars of the foundation slab, the wall body, the column and the floor slab is ensured to be in place, so that the control of the positions of the protective layer and the steel bars is accurate, the positions of the steel bars for inserting the steel bars are required to be checked in real time, the vertical stressed steel bars are connected by straight threads, the distance lines of the stirrups are drawn, the processing quality of the stirrups is checked in a spot mode, the stirrups are bound, and plastic cushion blocks are installed, and if the;
(d) the reinforcing steel bar protection layer is a key ring for preventing the reinforcing steel bar from being corroded and ensuring the durability of the structure. The steel bar protection layer is specially designed according to different parts of the structure, a standard plastic cushion block is adopted, two points of the cushion block are in contact with the template, the contact area does not exceed 2 square millimeters, the plastic cushion block with the same color as the engineering concrete is specially made in order to enable the color of the contact point of the plastic cushion block and the template to be consistent, the exposed part does not affect the whole appearance quality, and the pull-through lines are enabled to be neat and uniform in position in the installation process of the cushion block.
Step three: form work
(1) Material selection and design of shuttering
In order to ensure the plain construction effect of the fair-faced concrete, the plain concrete customized templates are designed and put into the plain concrete customized templates according to engineering requirements, different types of templates are designed aiming at different structural parts, necessary measures are taken from the aspects of installation, maintenance, removal and the like of the templates to ensure the effect of the fair-faced concrete, and the plain concrete customized templates are designed into an assembly tool type integral template to better embody the effect of the fair-faced concrete.
(a) The mirror surface top level red template is selected for the project, the mirror surface top level red template with smaller flatness deviation has the advantages of high strength, large hardness, plastic-plated surface finish, high flatness and the like, the template system is easy to assemble and disassemble, has tight seams, smooth concrete surface after pouring, high one-step forming rate, does not need to be reprocessed, and simultaneously cleans the inner surface and the corners of the template to ensure smooth inner surface and tight seams. Tests prove that the flatness deviation of the mirror top level red template can still reach within 2mm after the mirror top level red template is used for 5 times;
(b) in the clear water concrete engineering, the decorative holes do not have the situations of slurry leakage, sand casting and uneven height of the holes, high-quality plugs can be manufactured by self after field tests, corresponding high-quality molds are produced, the high-quality plugs can be produced in batches, the engineering quality is guaranteed, the manufacturing cost is saved, the high-quality flexible plastic plugs are replaced by the decorative plugs, and 15mm sponge ring pads are additionally attached to the surfaces of the existing decorative plugs. Aiming at the improved decorative hole plugs, node diagrams are drawn, sample plate walls are manufactured, the improvement effect is tested, 100% of the improved decorative hole plugs meet the standard requirements, and the improved decorative hole plugs are used on the basement clear water walls in a large area;
(c) the transverse spacing and the whole-direction spacing of the counter-pull screw holes meet the requirement of a scheme, and the pull rod of the fixed template is buckled by flexible plastic, so that the template is convenient to disassemble, and the damage to the surface of concrete is reduced.
(2) Testing and mounting of forms
(a) Detecting by using a self-made template flatness detector, cleaning the plane of a template to be detected, placing the detector and the template to be detected on the same plane, placing the plane to be detected of the template to be detected below a detection ruler, adjusting whether the detection ruler is horizontal to the plane to be detected or not through scale marks on telescopic supporting legs, starting the laser transmitter and the laser sensor, sliding from one end to the other end of the detection ruler, and knowing data of each collecting point through a display screen, so that the flatness of the template to be detected can be obtained;
(b) pre-installing a template: pre-installing templates according to engineering design drawings, wherein the templates are pre-installed strictly according to the requirements of the drawings in the process, the templates are numbered, and the templates need to be arranged according to the template numbers in the processes of loading and transportation so as to ensure that the templates can be placed in a number-checking way and accurately positioned for use when being formally installed;
(c) formally installing the template: the column formwork, the wall formwork, the beam formwork and the like are hoisted in place in sequence, after the column formwork, the wall formwork, the beam formwork and the cicada seam are spliced by bolts, sealing strips are clamped at the open seam and the cicada seam, wall-penetrating clamping bolts are installed to ensure the strength and the rigidity of the formwork and prevent the formwork from expanding and leaking, the wall column formwork is firmly supported, the beam and the plate bottom formwork support frame are horizontally flat and vertical, joints are staggered and stably constructed, single wood beam is adopted for on-site formwork joint wood beam according to the design of a construction scheme, the checking and calculation standard of existing formwork calculation software is analyzed and calculated according to common concrete, so that the allowable deviation of the formwork joint can not meet the requirements of facing fair-faced bare concrete easily, according to timely improvement after on-site actual measurement, the wood beam with stronger rigidity is replaced, the vertical formwork joint is reinforced by 3 wood beams, and a short beam is added at the horizontal joint of a new. On the basis of the original construction scheme, the contact area of the wood purlin and the template is increased, the rigidity of a template supporting system is enhanced, the template joint can be effectively controlled, and the allowable deviation of joint staggering is less than or equal to 2 m;
(d) the inner surface of the template is uniformly coated with a high-quality water-soluble release agent, so that the template can be smoothly released without polluting the concrete surface, the concrete surface is ensured to be smooth and even, the requirements of a facing fair-faced concrete construction process are met at one time, the release agent is inspected by a specially-assigned person after being coated, and the next procedure is carried out after the inspection is qualified;
(e) use self-made template support system atress to warp stop device to adjust the rigidity and the precision of template support system, the lattice column plays and supports the fixed action, the coarse adjustment mechanism is used for adjusting the distance between fine adjustment mechanism and the template support system, fine adjustment mechanism passes through the rotatory threaded rod that drives of driving motor and rotates, the transmission effect through steel connecting pipe and steel hinge pole adjusts the distance between stopper and the template support system, the distance between accurate regulation installation piece and the template support system, thereby carry out accurate injecing to template support system atress deformation volume.
Step four: plain concrete pouring project
(a) Raw material control: the color tone and the surface effect of the fair-faced concrete depend on cement to a great extent, so that the color, the strength, the stability, the durability, the weather resistance and other performances of the cement are emphasized in the selection process, the self-compacting concrete is selected, can flow and compact under the action of self gravity, the template can be completely filled even if compact steel bars exist, meanwhile, good homogeneity is obtained, the concrete with additional vibration is not needed, and the test result shows that the slump is within 180 +/-20 mn and 250 +/-20 mn. In order to ensure the consistent color of the concrete, cement of the same manufacturer and the same strength grade must be selected, meanwhile, products of the manufacturer must ensure stable quality and meet supply, the mix proportion design not only meets the strength requirement, but also considers the consistency of the colors of the concrete of different strength grades, the concrete (including various admixtures) of various strength grades to be used in the construction process is all prepared, and the concrete is manufactured on the construction site 1: the beam-column model with 4 proportions adopts concrete with different mix proportions to perform trial pouring, is maintained according to a determined maintenance method after being demolded, can identify and confirm all indexes of the concrete together with owners and proctorings, cannot be changed after the proportion is determined, and arranges a specially-assigned person to enter a concrete production plant to perform detection and quality control of each batch;
(b) stirring and transporting of concrete: the method is characterized in that special vehicles and equipment are equipped, the concrete bucket and the concrete conveying pump pipe on a construction site must be cleaned once before and after each pouring so as to ensure the cleanness of concrete, a specially assigned person is dispatched to supervise and check the concrete material of each vehicle so as to ensure that the concrete material meets the requirements, the position of a pump truck and a concrete conveying line are planned in advance, and the continuity of the concrete pouring is ensured;
(c) pouring and vibrating concrete: the whole underground structure bears larger building load and has wide area, so the raft foundation is adopted, and the thickness reaches 1.3 m; meanwhile, the total-station foundation construction adopts a fair-faced concrete construction process, the requirements on the pouring quality, the pouring appearance and the like are high, in order to ensure the construction quality of the fair-faced concrete, the engineering adopts a layered continuous pouring method, the circular pouring is carried out according to the modes from the periphery to the center and from the center to the periphery, cement mortar with the thickness of 50mm is poured at the root part during the site concrete pouring, then concrete materials are poured in layers, the vibration is carried out in layers, the pouring thickness of each layer of concrete is controlled within 40cm, and the press polish is carried out before the initial setting of the concrete after the pouring is finished;
(d) and (4) maintaining after pouring, wherein the matched working procedures among groups can be timely connected, and after the pouring of the on-site clear water concrete is completed, the earthwork cloth is used for heat preservation, covering and maintaining in time.
Step five: form removal
When the template is detached, the fixture and the connecting bolt are loosened and detached firstly, so that the template is separated from concrete, when the template is locally adsorbed or bonded, a crowbar is strictly forbidden to pry the template to move at a single point, the template is forbidden to be knocked, a hoist is used for horizontally pulling, the template can be lifted after being completely separated from a wall body, ropes are bound on two corners of the lower part of a template system before lifting, in the lifting process, the ropes are controlled by workers to prevent the template from swinging up and down and leftwards and rightwards unevenly and rubbing against other objects, the template is immediately cleaned and trimmed after being detached, a release agent is uniformly coated on the template, and the template is lifted to a storage place for later use after being trimmed.
Step six: finished product curing of fair-faced concrete
The fair-faced concrete curing method is to keep the surface moist for a long time, namely, after pouring, the surface is covered by geotextile in a heat preservation way, the coverage rate reaches 100 percent, after 12 hours, watering curing is started, and continuous watering is carried out according to the weather condition to keep the surface moist for not less than 14 days.
All the construction of the steps is completed according to the requirements of the construction process, and the construction of the next procedure can be carried out only if the construction is qualified.
The present invention and its embodiments have been described above, and the embodiments shown in the drawings are only one of the embodiments of the present invention, and the present invention is not limited to the above-described best embodiments. In summary, those skilled in the art should, without departing from the spirit of the present invention, devise similar structural modes and embodiments without inventively designing them, and shall fall within the scope of the present invention.
Claims (5)
1. The construction method of the bare concrete of the underground substation is characterized by comprising the following steps:
the method comprises the following steps: measuring and paying off;
step two: the steel bar is manufactured, rust-proof galvanized lead wires are adopted, binding heads are bent into the steel bar framework, contact with the template is avoided, and the appearance quality is ensured by adopting plastic cushion blocks with the colors consistent with the color of the template;
step three (1): selecting materials and designing a template, (a) adopting a mirror top level red template; (b) a flexible plastic decorative plug is adopted, and a 15mm sponge ring pad is attached to the surface of the decorative plug; (c) flexible plastics are adopted for pull screw holes of the fixed template, so that damage to the surface of concrete is reduced when the template is removed;
step three (2) testing and installing the template, (a) detecting by adopting a template flatness detector; (b) pre-installing templates according to engineering design drawings, numbering the templates, and ensuring that the templates can be placed in a seat in a number-checking manner and accurately positioned for use when being formally installed; (c) column molds, wall molds, beam molds and the like are hoisted, spliced and placed in place in sequence, sealing strips are clamped at the open seams and cicada seams, wall penetrating clamping bolts are installed, vertical template seams are reinforced by 3 wood beams, horizontal seams at the joints of new and old concrete are reinforced by 1 short wood beam on the basis of the original scheme, the contact area of the wood beams and the templates is increased, and the rigidity of a template supporting system is enhanced; (d) uniformly brushing a high-quality water-soluble release agent on the inner surface of the template, checking and accepting by a specially-assigned person after brushing the release agent, and performing the next procedure after the checking and accepting are qualified; (e) the rigidity and the precision of the template supporting system are adjusted by using a limiting device for the stress deformation of the template supporting system, so that the stress deformation quantity of the template supporting system is accurately limited;
step four: pouring fair-faced concrete, (a) adopting self-compacting concrete; (b) special vehicles and equipment are equipped for stirring and transporting concrete, so that the continuity of concrete pouring is ensured; (c) adopting a layered continuous pouring method, performing circulating pouring from the periphery to the center, then from the center to the periphery, and after pouring is finished, calendering the concrete before initial setting; (d) maintaining after pouring, and after pouring of the on-site clear water concrete is completed, timely maintaining the temperature by using geotextile for covering and maintaining;
step five: removing the template, namely loosening the removing clamp and the connecting bolt to separate the template from the concrete, horizontally pulling by using a hoist when the local concrete adsorbs or is adhered to the template, and hoisting after the template is completely separated from the wall;
step six: and (3) maintaining the finished product of the clear water concrete, performing heat preservation covering by using geotextile after pouring, wherein the coverage rate reaches 100%, starting watering maintenance after 12h, and continuously watering according to weather conditions to keep the wetting to be not less than 14 d.
2. The method for constructing bare concrete for an underground substation according to claim 1, wherein in the second step, the plastic cushion block is in two-point contact with the template, and the contact area does not exceed 2 square millimeters.
3. The construction method of the bare concrete for the underground substation according to claim 1, wherein the flatness deviation of the mirror top level red template in the step three (1) is less than 2 mm.
4. The method for constructing the bare concrete of the underground substation according to claim 1, wherein in the step three (2), the allowable deviation of joint dislocation is less than or equal to 2m due to the contact area of the wood purlin and the template.
5. The construction method of the bare concrete for the underground substation according to claim 1, wherein in the step four, when the concrete is continuously poured in layers, cement mortar with the thickness of 50mm is poured at the root, then concrete materials are poured in layers, the concrete materials are vibrated in layers, and the pouring thickness of each layer of the concrete is controlled within 40 cm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821366A (en) * | 2014-03-03 | 2014-05-28 | 永升建设集团有限公司 | Plain concrete wall surface groove type three-dimensional wood grains decoration construction method |
| CN107060340A (en) * | 2017-03-20 | 2017-08-18 | 郑州航空工业管理学院 | A kind of construction technology of Machine-made Sand clear-water concrete |
| US20180044907A1 (en) * | 2016-08-12 | 2018-02-15 | Wuhan Zhihe Geotechnical Engineering Co., Ltd | Inverse construction method for deep, large and long pit assembling structure of suspension-type envelope enclosure |
| CN110107085A (en) * | 2019-05-10 | 2019-08-09 | 中铁六局集团有限公司 | Superelevation fair-faced concrete column construction method |
-
2021
- 2021-03-01 CN CN202110227378.5A patent/CN113006135A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103821366A (en) * | 2014-03-03 | 2014-05-28 | 永升建设集团有限公司 | Plain concrete wall surface groove type three-dimensional wood grains decoration construction method |
| US20180044907A1 (en) * | 2016-08-12 | 2018-02-15 | Wuhan Zhihe Geotechnical Engineering Co., Ltd | Inverse construction method for deep, large and long pit assembling structure of suspension-type envelope enclosure |
| CN107060340A (en) * | 2017-03-20 | 2017-08-18 | 郑州航空工业管理学院 | A kind of construction technology of Machine-made Sand clear-water concrete |
| CN110107085A (en) * | 2019-05-10 | 2019-08-09 | 中铁六局集团有限公司 | Superelevation fair-faced concrete column construction method |
Non-Patent Citations (4)
| Title |
|---|
| 中国建筑股份有限公司: "《清水混凝土应用技术规程（JGJ 169-2009）》", 31 May 2009, 中国建筑工业出版社 * |
| 刘如峰 等: "瓦房店龙山污水处理厂施工优化", 《施工技术》 * |
| 王东: "地下室筏板大体积混凝土施工技术", 《安徽建筑》 * |
| 魏战磊: "预应力钢绞线空心式混凝土基础施工应用", 《中国建筑金属结构》 * |
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