CN113863675A - Concrete construction method for main transformer tunnel structure - Google Patents

Concrete construction method for main transformer tunnel structure Download PDF

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Publication number
CN113863675A
CN113863675A CN202111250024.9A CN202111250024A CN113863675A CN 113863675 A CN113863675 A CN 113863675A CN 202111250024 A CN202111250024 A CN 202111250024A CN 113863675 A CN113863675 A CN 113863675A
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China
Prior art keywords
template
construction
main transformer
concrete
installing
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CN202111250024.9A
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Chinese (zh)
Inventor
卫书满
王国刚
卫学识
董存福
卫学深
卫文秀
陈满星
彭龙
袁峥
何磊
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Huangshi Yangzi Jian'an Group Co ltd
China Gezhouba Group Mechanical and Electrical Construction Co Ltd
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Huangshi Yangzi Jian'an Group Co ltd
China Gezhouba Group Mechanical and Electrical Construction Co Ltd
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Priority to CN202111250024.9A priority Critical patent/CN113863675A/en
Publication of CN113863675A publication Critical patent/CN113863675A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/66—Sealings
    • 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
    • E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
    • E04G11/08—Forms, which are completely dismantled after setting of the concrete and re-built for next pouring
    • 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
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • 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
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/02—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor
    • 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
    • E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
    • E04G13/06—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall
    • E04G13/062—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for stairs, steps, cornices, balconies, or other parts corbelled out of the wall for stairs or steps
    • 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
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/14—Conveying or assembling building elements
    • 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

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Abstract

The invention discloses a main transformer hole structure concrete construction method, which is characterized in that a main transformer hole is divided into regions and is constructed in a partitioning and time-sharing manner, in the construction process, an embedded part project adopts a compiling information card, and the embedded part information card is matched with a field information card, so that the error rate of manual check is reduced, the embedded part enters the field in a time-sharing and regional manner according to the compiling information, the construction logic is clear, and in the main transformer hole region construction of a large number of embedded parts, the construction efficiency is greatly improved and the embedded part missing probability is reduced; the formwork engineering adopts a regional construction mode, and the anchor bars of the on-site structural surface are fully utilized for fixing, so that the structural stability is enhanced, and the formwork erection cost is reduced; a large amount of fastening equipment in the template engineering such as split bolts and the like can be recycled after being dismantled, so that the problems that in the prior art, all construction areas interfere with each other and the construction progress is influenced during the construction of a main transformer tunnel workshop, and electromechanics and gold knots are easily generated, buried and reworked are solved.

Description

Concrete construction method for main transformer tunnel structure
Technical Field
The invention belongs to the technical field of hydropower station building construction, and particularly relates to a main transformer tunnel structure concrete construction method.
Background
The main transformer tunnel factory building is arranged in a straight line shape and is long and narrow, and the only channel for material to enter and exit is a main transformer traffic tunnel; when concrete construction pouring is carried out, the problems that traffic is not smooth, construction areas are interfered with one another, and bin materials cannot be in place in time are caused; and the major properties of construction, electromechanical metal knots and the like in cable ditches and drainage ditches in the main transformer cavern plant are poor, and the problems of missing burying and reworking are easily caused, so a concrete construction method for the main transformer cavern structure is required to be designed to solve the problems.
Disclosure of Invention
The invention aims to solve the technical problem of providing a main transformer tunnel structure concrete construction method, compared with the traditional method, the method can effectively avoid the problems of mutual interference of all construction areas and influence on construction progress during construction of a main transformer tunnel workshop, electromechanical and metal junction missing burying and reworking are easy to generate, and has the characteristics of clear construction logic, capability of avoiding mutual interference and untimely feeding during block construction, and capability of effectively avoiding the problems of missing burying and reworking during pre-burying operation.
In order to realize the technical effects, the technical scheme adopted by the invention is as follows: a main transformer hole structure concrete construction method comprises the following steps:
s1, base and sewing surface treatment:
s2, measuring and setting out: using a total station to emit body type control points and mark the body type control points at an obvious fixed position, emitting elevation points, determining the side line of the vertical mold and the top surface warehouse-in elevation, and marking;
s3, anchor rod construction:
s301, determining hole positions;
s302, forming a hole: after the hole position of the anchor rod is determined, drilling a drill rod vertical to the base plane; when the drilling depth is not less than the design depth, moving to the next drilling hole;
s303, cleaning holes;
s304, grouting;
s305, mounting an anchor rod;
s4, manufacturing and installing steel bars: installing the steel bars according to the sequence of firstly drilling vertical erection steel bars, then installing horizontal erection steel bars and finally installing structural steel bars of the bottom plate;
s5, installing embedded parts: the method comprises the following steps of water stop copper sheet installation and electromechanical embedded part installation:
s501, water stop copper sheet installation: arranging a water stop copper sheet on adjacent main transformer chambers of a main transformer cavern plant;
s502, electromechanical embedded part installation comprises water supply and drainage, cable trench, surrounding rock water permeable hose, electrical lighting pipeline embedding and electrical one-time grounding installation, and the installation method comprises the following steps:
a. compiling an electromechanical embedded part information card: encoding the type, the embedding position, the embedding sequence and the embedding process of the electromechanical embedded part, wherein the information cards are respectively arranged at the electromechanical embedded part and the corresponding site embedding position;
b. comparing the information cards, entering the electromechanical embedded parts in a time-sharing and regional mode according to the construction sequence and the construction region according to the principle of code matching, and embedding the electromechanical embedded parts according to the indication of the information cards;
c. performing electric embedded part test and acceptance after embedding; retesting and re-acceptance after concrete pouring;
s6, template installation: at each structural part erection template, including adjacent main room parting template, cable pit template, frame plate beam column template, wall body template and stair template that become:
s601, installing adjacent main transformer chamber parting templates: enclosing purlins are arranged on the back of the template at equal intervals, and main enclosing purlins are arranged on the surface of one side of each enclosing purlin at certain intervals; embedding an anchor in a wall in the concrete pouring process, welding the anchor with a brace and fixing the anchor by pulling the brace in the wall, wherein the end of the anchor is in interference fit with an inclined strut support; blocking a gap between the template and the rock side;
s602, installing a cable trench template: closed templates are laid on the bottom surface and the side wall of the cable trench, and surrounding purlins are arranged on the back of each template at equal intervals; the bottom surface of the cable trench is provided with a plurality of rows of longitudinal braces which are distributed at equal intervals, the outer sides of the side purlins of the cable trench are provided with main purlins at certain intervals, and the main purlins are fixed by pulling in the braces; a horizontal top support is arranged between the cable trench side wall templates;
s603, mounting a framework plate beam column template:
enclosing purlins are installed on the back of the column template at equal intervals, and main enclosing purlins are arranged on the surface of one side of each enclosing purlin at certain intervals; column formworkBy passingOppositely pulling and fastening the oppositely pulling bolts; the sleeve is arranged outside the split bolt, and the end part of the sleeve penetrates out of the template so as to prevent concrete from flowing into the sleeve and pouring the split bolt in the structure; the column formwork is provided with inner stays at certain intervals, and the inner stays are bound and connected with the wall steel bars;
beam bottom template and plate bottom template IThe sides are connected with reinforcing ribs arranged at equal intervals; enclosing purlins are installed on one side of the beam web template at equal intervals, and main enclosing purlins are arranged on the surface of one side of each enclosing purlin at certain intervals; beam web templateBy passingOppositely pulling and fastening the oppositely pulling bolts; a sleeve is arranged outside the split bolt, and the end part of the sleeve penetrates out of the template; fastening devices are arranged at equal intervals at the lower opening of the beam bottom for fastening;
s604, installing wall formworks: the method comprises the following steps of installing an outer wall template and an explosion-proof wall template:
wall bodyDieEnclosing purlins are arranged on the back of the plate at equal intervals; the main enclosing purlins are arranged on the surface of one side of each enclosing purlin at certain intervals, are fastened through split bolts, and are fastened on the main enclosing purlins through split screw rods and fixed through double nuts; the positioning ribs on one side of the template are provided with positioning ribs and anchor ribs which are connected and matched with the template; inner stays are arranged on one side of the template at certain intervals and are bound and connected with the wall steel bars;
s605, mounting a stair template: the stair template and the frame structure are constructed synchronously;
s7, warehousing and pouring concrete, dismantling a template and protecting a finished product: arranging a fence, and shielding and protecting the concrete surface through a shielding object; the secondary operation position of the permanent concrete surface is shielded by a wood template, and the permanent concrete surface is covered and protected by a film at a certain height; after the template is dismantled, the split bolt can be repeatedly used.
Preferably, in step S1, the foundation and joint surface treatment includes bedrock cleaning, construction joint cleaning and structural joint treatment.
Preferably, in step S4, when the steel bars are erected, the vertical erecting steel bars of the peripheral side wall of the main transformer cavern are erected by using the original surrounding rock bolts.
Preferably, in step S5, the water-stopping copper sheet is a "W" shaped water-stopping copper sheet, and the water-stopping copper sheet is fixed to the transverse purlin by a fixing structure.
Preferably, in step S7, the concrete temperature control includes material ratio control, construction process control and concrete transportation control.
The invention has the beneficial effects that:
according to the method, the main body construction mode is developed after the overall situation and comprehensive comparative analysis are adopted, the most reasonable propulsion sequence is determined, the main transformer tunnel region is divided into regions, and the partition and time-sharing construction is carried out, so that the problems that in the prior art, when the main transformer tunnel workshop is constructed, all construction regions interfere with each other, the construction progress is influenced, and electromechanical and metal junction leakage burying and rework are easily caused are solved; in the construction process, the embedded part engineering adopts a mode of compiling an information card, the embedded part information card is matched with a field information card, comparison can be carried out through a handheld code scanning tool, the error rate of manual verification is reduced, the embedded part enters the field in a time-sharing and regional mode according to the compiling information, the construction logic is clear, and in the main transformer hole region construction of a large number of embedded parts, the construction efficiency is greatly improved and the probability of missing burying of the embedded part is reduced; the formwork engineering adopts a regional construction mode, and the anchor bars of the on-site structural surface are fully utilized for fixing, so that the structural stability is enhanced, and the formwork erection cost is reduced; a large amount of fastening equipment in the template engineering, such as split bolts and the like, can be recycled after being dismantled; the method has the characteristics of clear construction logic, capability of avoiding the problems of mutual interference and untimely feeding in block construction, and capability of effectively avoiding the problems of missing burying and reworking in pre-buried operation.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic structural diagram of a water-stop copper sheet in the invention;
FIG. 3 is a schematic view of the installation of the water-stop copper sheet in the present invention;
the reference numbers in the figures are: the water-stop purlin comprises a template 1, a steel pipe 2, a vertical enclosing purlin 3, bent pipe steel bars 4, a wood wedge 5, a water-stop copper sheet 6 and a transverse enclosing purlin 7.
Detailed Description
Example 1:
as shown in fig. 1, a main transformer cavern structure concrete construction method includes the following steps:
firstly, preparation operation before construction is carried out:
(1) dividing a main transformer hole into seven blocks, specifically: 1# to 4# main transformer chamber sections are divided into four blocks by boundary marking lines arranged on structural deformation joints; the main transformer 2# auxiliary workshop is divided into a block; the left and right length of the main transformer 1# auxiliary workshop is 40.47m, the width of water supply and drainage is 19.7m, and the floor levelProduct is approximately 800m2In the concrete pouring process, a cold joint is easy to form, so that two temporary construction joints are divided by using CZ0-107.570 as a landmark line;
(2) the method comprises the following steps of sequentially unfolding a main transformer 1# auxiliary workshop (in stages) → 1# -4 # main transformer section main body structure (in stages) → main transformer 2# auxiliary workshop from inside to outside; when the concrete is sequentially unfolded, when the upper section of structural concrete is finished, the adjacent lower section is inserted in advance and the construction of the structural concrete with the height of 450.050m needs to be finished;
(3) the construction of the main transformer hole main body is integrally divided into seven blocks in three sections, and the seven blocks are sequentially unfolded from inside to outside according to the sequence of a main transformer 1# auxiliary plant → 1# -4 # main transformer section main body structure → a main transformer 2# auxiliary plant.
And (4) constructing and unfolding each main body from the bottom plate to the top, and selecting layered pouring according to the structural characteristics of the plate, the beam and the column.
The specific construction process is as follows:
s1, base and sewing surface treatment:
s2, measuring and setting out: using a total station to emit body type control points and mark the body type control points at an obvious fixed position, emitting elevation points, determining the side line of the vertical mold and the top surface warehouse-in elevation, and marking;
s3, anchor rod construction: the corner points of a side frame column positioned at CH0+070.100 are designed to be reinforced by a lower anchor rod at an elevation of 449.550 m; the anchor rod is provided with phi 25 anchor bars, the length of the anchor rod is 3000mm, and the rock-entering depth is 2000 mm; the anchor rod is a full-length bonding type common cement mortar anchor rod, and the strength grade of grouting cement mortar is M30;
s301, determining hole positions:
measuring a control point of anchor rod construction by using a total station before construction, burying a stone for marking, after a retest line is qualified, laying hole sites on the spot by using a steel ruler and a measuring line, and marking a hole by using red paint;
s302, forming a hole:
after the hole position of the anchor rod is determined, drilling a drill rod vertical to a base plane, and controlling the allowable error to be +/-2 degrees; and after the designed depth is reached, the drilling is not stopped immediately, the drilling is over-drilled for 0.1m and is stably drilled for 1-2 min, the bottom end can not reach the designed anchoring diameter, and the sufficient grouting is ensured. When the drilling depth is not less than the design depth, moving to the next drilling hole; the diameter of the anchor hole is 42mm, and the depth of the anchor hole is not less than 2 m; the allowable deviation of the hole distance is 30mm, the error of the perpendicularity of the formed hole of the anchor rod is not more than 20mm, and the drilling depth is 50-100mm greater than the design depth;
s303, cleaning holes:
inserting well washing equipment such as a well washing pipe connected with an air compressor into the hole, and washing up and down in a reciprocating manner; discharging pore water in the hole by using a self-sucking pump, and timely grouting after cleaning the hole; if the grouting is not carried out for a long time after the hole forming, secondary hole cleaning is carried out before the grouting;
s304, grouting:
stirring M30 cement mortar on site, and controlling the water cement ratio at 0.5; cement adopts P.0.42.5, and machine-made sand is adopted as sand; inserting the stirred M30 cement mortar into the hole by using a grouting pipe, wherein the distance between the opening of the grouting pipe and the bottom of the hole is 20-30 cm; continuously pouring the stirred cement mortar by using a special grouting pump, and stopping grouting when the grout overflows from an orifice;
s305, anchor rod installation: placing the prefabricated anchor rod into the hole in the middle and fixing;
s4, manufacturing and installing steel bars: installing the steel bars according to the sequence of firstly drilling vertical erection steel bars, then installing horizontal erection steel bars and finally installing structural steel bars of the bottom plate;
s501, water stop copper sheet installation: arranging a water stop copper sheet on adjacent main transformer chambers of a main transformer cavern plant;
s502, electromechanical embedded part installation comprises water supply and drainage, cable trench, surrounding rock water permeable hose, electrical lighting pipeline embedding and electrical one-time grounding installation, and the installation method comprises the following steps:
a. compiling an electromechanical embedded part information card: encoding the type, the embedding position, the embedding sequence and the embedding process of the electromechanical embedded part, wherein the information cards are respectively arranged at the electromechanical embedded part and the corresponding site embedding position;
b. comparing the information cards, entering the electromechanical embedded parts in a time-sharing and regional mode according to the construction sequence and the construction region according to the principle of code matching, and embedding the electromechanical embedded parts according to the indication of the information cards; construction managers can adopt handheld code scanning equipment to perform code scanning comparison, and the code scanning comparison is matched with manual comparison;
c. performing electric embedded part test and acceptance after embedding; retesting and re-acceptance after concrete pouring;
s6, template installation: at each structural part erection template, including adjacent main room parting template, cable pit template, frame plate beam column template, wall body template and stair template that become:
s601, installing adjacent main transformer chamber parting templates: square wood enclosing purlins are installed on the back of the template at equal intervals of 25cm, and A48 double steel pipes are arranged on the outer sides of the wood enclosing purlins at intervals of 60cm to serve as main enclosing purlins; when concrete is poured, short iron materials are pre-buried in the wall to serve as anchors according to the number of the braces and the diagonal pulling angle of the braces, and the braces are made of phi 12 round steel; the anchor is welded with the brace and fixed by pulling the brace inwards, and the end is supported and fixed by an inclined strut support; the gap of the template close to the rock side is blocked;
s602, installing a cable trench template: the bottom surface and the side wall of the cable trench are installed in a totally-enclosed manner by adopting a template; square wood purlins are arranged on the back of the template at intervals of 25 cm; the width of the bottom of the cable trench is 1.4m, two rows of longitudinal braces distributed at intervals of 1.0m are arranged, A48 double steel pipes are arranged on the outer side of the side wall wood purlin at intervals of 60cm and serve as a main purlin, and the main purlin is fixed by pulling in phi 12 braces; the upper and lower channels of the cable trench side wall formworks are horizontally supported by steel pipes with the length of 1.5 m;
s603, mounting a framework plate beam column template:
column formwork back is according to 20cm interval installation square timber purlin, and the timber purlin outside sets up and sets up two steel pipes of A48 according to 60cm interval and enclose the purlin as mainly, mainly encloses the purlinBy passingTightening a phi 12mm counter-pulling screw; a phi 20mm PVC pipe is used as a counter-pull screw sleeve, and the PVC sleeve penetrates through a template drill hole to prevent cement slurry from entering the PVC sleeve when concrete is poured; after the mold is removed, the split bolt can be extracted and can be repeatedly used; wherein the height of the first starting main enclosing purlin from the floor is not more than 200 mm; the template positioning ribs are phi 16 steel bars, the spacing between the positioning ribs is not more than 500mm, and the four corners of the column body are provided with the positioning ribs; before the template is installed, cutting a tail iron head not smaller than phi 12 by using a grinding wheel cutting machine to be consistent with the size of the section of the column, using the tail iron head as an inner stay bar, arranging the inner stay bar at intervals of 600mm multiplied by 600mm, and firmly binding the inner stay bar with a wall body reinforcing steel bar by using lead wires;
reinforcing ribs arranged at equal intervals are connected to one sides of the beam bottom template and the plate bottom template, and the reinforcing ribs are square ribs to reinforce the rigidity of the bottom die; the pitch of the square ridges is determined according to the designed plate thickness, the size of the cross section of the beam and the pitch of the main ridge steel pipes; when the height of the beam web is not less than 500mm, the beam web template uses 40mm multiplied by 80mm square wood to enclose purlins, the distance adopts 250mm, and common steel pipes with double phi 48mm are used as vertical or horizontal main enclosing purlins; the main purlin is fastened through phi 12 counter-pulling screw rods; the counter-pull screws are arranged according to the horizontal distance of 600mm and the vertical row spacing of 600mm, a phi 20mm PVC pipe is used as a counter-pull screw sleeve, and the PVC sleeve penetrates through the template drill hole; all the beam bottom lower openings are fixed by fastening devices, and the fastening devices are fastened by step fastening tool clamps at intervals of 600 mm;
s604, the main transformer cave factory building wall body mainly comprises an outer side wall with the elevation below 450.050m and an explosion-proof wall body around the main transformer:
exterior side wall at elevation below 450.050 m: marking point positions on the surrounding rock surface by using paint according to the number of the pulling strips, the diagonal pulling inclination angle, the horizontal spacing of 600mm and the row spacing of 600mm, and forming holes on the point positions to ensure that the rock penetration depth of the formed holes is not less than 200 mm; the diameter of the hole is selected from a phi 20 short iron head which is hit into the hole and the exposed length of which is not less than 100mm so as to be used as an anchor bar, and the anchor bar is welded with a brace to reinforce the template; the length of the horizontal welding line of the brace and the anchor bar is not less than 50 mm; the template on the other side of the wall body adopts a phenolic gluing template with the thickness of 1.5 cm; according to a construction control line, a positioning rib is driven along a wall edge ink line, and the positioning rib is a phi 16 steel bar, so that the accuracy of positioning a template in place during formwork support is ensured; arranging 40 multiplied by 80mm square wood enclosing purlins at the back of the template at intervals of 20 cm; a48 double steel pipes are arranged on the outer side of the wooden purlin to serve as main purlins, the spacing is 60cm, the wooden purlins are fixed by drawing in phi 12 bracing pieces, and the steel pipe frames are arranged into an integrally stressed inclined frame for supporting; the distance between the main purlin of the lowest row of steel pipes and the lower opening of the template is controlled to be about 200 mm;
installing wall formworks:dieThe plates are assembled by adopting phenolic gluing templates with the thickness of 15mm, and square wood purlins with the thickness of 40 multiplied by 80mm are arranged at the back of the templates at the interval of 20 cm; a48 double steel pipes are arranged on the outer side of the wooden enclosing purlin to serve as main enclosing purlins at intervals of 60cm, wherein the height of the first starting main enclosing purlin from the floor is not more than 200 mm; the template positioning ribs are phi 16, the spacing is not more than 500mm, and the four corners of the wall body are provided with the positioning ribs; cutting an iron head with the diameter not less than phi 12 by using a grinding wheel cutting machine to be consistent with the thickness of the wall body, using the iron head as an inner supporting strip,the distance is set according to 600 x 600mm, and the inner stay is firmly tied with the wall body steel bar by lead wires; selecting phi 12 screw rods and sleeving DN16PVC pipes, arranging the phi 12 screw rods at intervals of 600mm multiplied by 600mm, fastening split screw rods on double phi 48 steel pipes of the main purlin, and fixing the split screw rods on at least two rows of screw rods;
s605, mounting a stair template: the construction of the stair template and the frame structure is synchronously carried out;
s7, putting concrete into a bin and pouring: transporting the mixed concrete to an operation site, and pouring by a concrete pump; vibrating and controlling the temperature in the pouring process; after pouring is finished, concrete maintenance and defect treatment are carried out;
s8, protecting finished products: arranging a fence, and shielding and protecting the concrete surface through a shielding object; and the secondary operation position of the permanent concrete surface is shielded by adopting a wood template, and the position with a certain height is covered and protected by a thin film.
Preferably, in the above method for constructing concrete of a main transformer cavern structure, in step S1, the concrete surface treatment method includes:
cleaning bedrock: before construction, manually prying loose rock masses, and cleaning up sundries and scum on the bedrock of the concrete pouring section;
cleaning a construction joint: the temporary concrete construction joint is subjected to manual roughening treatment; the layered construction joints are chiseled manually by using a chiseling machine or an air pick; manually cleaning the chiseling, washing the floating slurry and residues until no emulsion skin exists on the construction joint surface, the rough surface is formed, and coarse sand is slightly exposed;
and (3) structural seam treatment: when the structural joint surface is treated, sundries on the joint surface are removed, metal embedded parts on the joint surface are cut off, and the structural joint surface is washed clean by water; then filling the mixture by adopting a polyethylene plastic joint plate; the water-swelling water stop strips are arranged on the structural deformation joints arranged on the structural plane and the structural joints between the main transformer hole and the traffic cable hole, the bus hole and the main transformer transportation hole.
Example 2:
preferably, in the above method for constructing concrete of a main transformer cavern structure, in step S4, the method for installing the steel bars specifically includes:
erecting steel bars: vertical erection steel bars of the peripheral side wall of the main transformer tunnel workshop are erected by utilizing the original surrounding rock anchor rods, and vertical erection steel bars cannot be arranged at the position which cannot be utilized by drilling holes by adopting an electric drill; the upper layer reinforcing mesh, the lower layer reinforcing mesh and the middle reinforcing mesh are provided with split heads or frame bars for positioning and are reinforced by inclined bars;
binding steel bars: the connection of the steel bar cross points of the steel bar mesh is bound according to 50% of intervals; when the diameter of the reinforcing steel bar is less than 25mm, binding the intersection points of the reinforcing mesh of the wall layers of the floor slab and the wall body point by point; the steel bar mesh is stressed in two directions in the plate, and steel bar cross points are bound completely; the steel bars of the beam and the column and the intersection points of the main reinforcements and the stirrups are bound at the corners, and the middle parts can be bound at even intervals;
the structural steel bars are connected or bound by straight thread mechanical connecting joints according to the diameters.
Example 3:
as shown in fig. 2, the water-stopping copper sheet is a water-stopping copper sheet with a W-shaped structure;
as shown in fig. 3, the water stop copper sheet is fixed with the bent pipe steel bars through a fixing structure, the fixing structure adopts a wood wedge, the wood wedge is arranged between the transverse enclosing purlins of the template and is clamped and fixed by the bent pipe steel bars between the transverse enclosing purlins, and one end of the water stop copper sheet penetrates through the wood wedge and is fixed with the template.
Example 4:
preferably, in the above method for constructing concrete of a main transformer cavern structure, in step S7, the method for controlling the temperature of concrete is as follows:
(1) selecting a proper material ratio: selecting cement with lower hydration heat, selecting proper admixture and additive, controlling the water content of concrete aggregate and reducing the dosage of cementing material;
(2) the construction is carried out in layers and blocks, and cold seams are avoided in the concrete pouring process;
(3) and (3) construction time and construction progress measures: the pouring at a high temperature time interval is avoided, and the pouring interval time is avoided from being too long;
(4) temperature control measures in concrete transportation: carrying out heat insulation treatment on the concrete transportation dump truck; and performing overall planning on the concrete transportation route.
Preferably, in the method for constructing concrete of a main transformer cavern structure, in step S7, the treatment of concrete defects includes slab staggering treatment, honeycomb pitted surface treatment, rib exposing treatment, cold seam treatment, crack treatment and water seepage treatment.
Preferably, 1.5cm phenolic aldehyde plywood is used as the templates; the back edge of the template adopts a 40mm x 80mm wood square.
Preferably, the concrete transportation adopts 10m concrete tank trucks for transportation from the delivery port to each position, and 4 concrete tank trucks are adopted for alternate transportation for ensuring the continuity of concrete pouring construction. The transportation time outside the concrete tank truck yard is not more than 30 minutes, the phenomena of separation, slurry leakage, serious bleeding, excessive slump reduction and the like are not allowed in the transportation process, and water is strictly forbidden to be added into the concrete.
Preferably, the concrete vibrating method is as follows:
(1) concrete is poured, a bin is leveled firstly and then vibrated, and the leveling instead of the vibration or the vibration instead of the bin is strictly forbidden;
(2) the vibration duration time of each vibration point is determined by a field vibration test, and the concrete coarse aggregate does not obviously sink any more and begins to be slurried without discharging bubbles;
(3) the insertion distance of the vibrator rods is not more than 1.5 times of the action radius of the vibrator; according to the selected 50-type inserted vibrating rod, the action range of the vibrating rod is 30cm, so that the inserting distance of the vibrating rod is not more than 50cm during vibrating;
(4) when the first base layer concrete is vibrated, the distance between the vibrating rod head and the hardening surface is 5cm, and when the upper layer concrete is vibrated, the vibrating rod head is inserted into the lower layer concrete by 5 cm-10 cm;
(5) in the concrete vibrating process, the vibrating is orderly carried out from one direction to the other direction, so that the leakage vibration and the over vibration are avoided. The formwork worker is arranged to check the stability of the formwork support and the sealing condition of the joint, and slurry leakage in the concrete vibrating process is prevented;
(6) the concrete vibrating rod is operated in a fast-inserting and slow-pulling mode, the vibrating rod cannot be flatly pulled in a mixture, and the concrete cannot be driven by the vibrating rod;
(7) in the process of pouring concrete around the water stop, the distance between the blanking and the water stop sheet is not less than 1m, and measures are taken to prevent large aggregates from gathering around the water stop sheet; concrete around the water stop is carefully vibrated to be dense.
Preferably, 12 hours after the concrete is poured, the concrete surface is watered and cured, so that the concrete surface is kept in a wet state, and the curing time is not less than 28 days.
Preferably, in step S7, the concrete defect processing method includes the following steps:
(1) and (3) slab staggering treatment:
chiseling the staggered platform according to the gradient of 1:10, then polishing by using a grinding wheel polishing machine to enable the staggered platform to be smoothly and smoothly connected, firstly scribing the treated part before construction, and keeping the treated appearance to be neat;
(2) treating the honeycomb pitted surface: for the treatment of local honeycomb pitted surface, adopting pre-shrinking mortar for repairing;
(3) exposing ribs:
chiseling the concrete at the exposed part, cleaning the concrete when chiseling to the depth of the protective layer, placing the reinforcing steel bar at the designed position, and filling the reinforcing steel bar with epoxy mortar;
(4) cold-seam treatment:
chiseling a U-shaped groove along the cold joint at the position where the cold joint appears, wherein the groove is 3 cm in width and 5cm in depth, cleaning, filling with epoxy mortar, compacting by vibration, and flattening the joint opening;
(5) and (3) crack treatment:
cracks with a width greater than 0.2 mm require treatment. The crack treatment method is the same as the cold crack treatment method, but the depth of a U-shaped groove chiseled along the crack is not less than the depth of the crack;
(6) water seepage treatment: and (5) performing key grouting on the water seepage position until the concrete surface is not seeped with water.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.

Claims (5)

1. A main transformer hole structure concrete construction method is characterized in that: the method comprises the following steps:
s1, base and sewing surface treatment:
s2, measuring and setting out;
s3, constructing a prefabricated anchor rod;
s4, manufacturing and installing steel bars: installing the steel bars according to the sequence of firstly drilling vertical erection steel bars, then installing horizontal erection steel bars and finally installing structural steel bars of the bottom plate;
s5, installing embedded parts: the method comprises the following steps of water stop copper sheet installation and electromechanical embedded part installation:
s501, water stop copper sheet installation: arranging a water stop copper sheet on adjacent main transformer chambers of a main transformer cavern plant;
s502, the electromechanical embedded part installation method comprises the following steps:
a. compiling an electromechanical embedded part information card: encoding the type, the embedding position, the embedding sequence and the embedding process of the electromechanical embedded part, wherein the information cards are respectively arranged at the electromechanical embedded part and the corresponding site embedding position;
b. comparing the information cards, entering the electromechanical embedded parts in a time-sharing and regional mode according to the construction sequence and the construction region according to the principle of code matching, and embedding the electromechanical embedded parts according to the indication of the information cards;
c. performing electric embedded part test and acceptance after embedding; retesting and re-acceptance after concrete pouring;
s6, template installation: at each structural part erection template, including the installation of adjacent main room parting template, cable pit template, frame plate beam column template, wall body template and stair template that becomes: arranging surrounding purlins at equal intervals on the back of the template in advance, and arranging main surrounding purlins on the surface of one side of each surrounding purlin at certain intervals;
s601, installing adjacent main transformer chamber parting templates: embedding an anchor in a wall in the concrete pouring process, welding the anchor with a template brace and fixing the anchor by pulling the brace in the wall, wherein the end of the anchor is in interference fit with an inclined strut support; blocking a gap between the template and the rock side;
s602, installing a cable trench template: closed templates are paved on the bottom surface of the cable trench and the side walls, a plurality of rows of longitudinal braces distributed at equal intervals are arranged on the bottom surface of the cable trench, main enclosing purlins are arranged on the outer sides of the enclosing purlins of the side walls of the cable trench at certain intervals, and the main enclosing purlins are fixed by the braces in an inward pulling manner; a horizontal top support is arranged between the cable trench side wall templates;
s603, mounting a framework plate beam column template:
column formworkBy passingOppositely pulling and fastening the oppositely pulling bolts; a sleeve is arranged outside the split bolt, and the end part of the sleeve penetrates out of the template; the column formwork is provided with inner stays at certain intervals, and the inner stays are connected and fixed with the wall;
the beam bottom formwork and one side of the plate bottom formwork are connected with reinforcing ribs which are arranged at equal intervals; beam web templateBy passingOppositely pulling and fastening the oppositely pulling bolts; a sleeve is arranged outside the split bolt, and the end part of the sleeve penetrates out of the template; the lower openings of the beam bottoms are provided with fastening devices for fastening;
s604, installing wall formworks: the method comprises the following steps of installing an outer wall template and an explosion-proof wall template:
the main enclosing purlin of the wall template is fastened through split bolts; the positioning ribs on one side of the template are provided with positioning ribs and anchor ribs which are connected and matched with the template; one side of the template is provided with inner stays at certain intervals, and the inner stays are connected with the wall body steel bars;
s605, mounting a stair template;
and S7, warehousing and pouring the concrete, dismantling the template and protecting the finished product after pouring.
2. The main transformer cavern structure concrete construction method according to claim 1, characterized in that: in the step S1, the foundation and joint surface treatment includes bedrock cleaning, construction joint cleaning, and structural joint treatment.
3. The main transformer cavern structure concrete construction method according to claim 1, characterized in that: and in the step S4, when the steel bars are erected, the vertical erecting steel bars of the peripheral side wall of the main transformer cavern plant are erected by utilizing the original surrounding rock anchor rods.
4. The main transformer cavern structure concrete construction method according to claim 1, characterized in that: in the step S5, the water-stopping copper sheet is a W-shaped water-stopping copper sheet, and the water-stopping copper sheet is fixed to the transverse purlin of the template through a fixing structure.
5. The main transformer cavern structure concrete construction method according to claim 1, characterized in that: in step S7, the concrete temperature control includes material proportioning control, construction process control, and concrete transportation control.
CN202111250024.9A 2021-10-26 2021-10-26 Concrete construction method for main transformer tunnel structure Pending CN113863675A (en)

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Application publication date: 20211231