CN102296570B - Construction method for large cast-in-situ reinforced concrete water inlet channel - Google Patents
Construction method for large cast-in-situ reinforced concrete water inlet channel Download PDFInfo
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- CN102296570B CN102296570B CN 201110173464 CN201110173464A CN102296570B CN 102296570 B CN102296570 B CN 102296570B CN 201110173464 CN201110173464 CN 201110173464 CN 201110173464 A CN201110173464 A CN 201110173464A CN 102296570 B CN102296570 B CN 102296570B
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Abstract
The invention relates to a construction method for a large cast-in-situ reinforced concrete water inlet channel. The construction method comprises the following steps: the construction of concrete near the water inlet channel is divided into five main parts, wherein the construction of the concrete around the water inlet channel adopts integral layered casting, the secondary pouring in the traditional casting process is eliminated, and the integration of the concrete around the water inlet channel is ensured; for the parts at which the concrete at the bottom of the elbow of the water inlet channel is not easily vibrated, a vibration guiding device is bound in advance when the parts pass through the bound steel bars, so that the density of the compact at the bottom is realized, and simultaneously a method for combining supporting and pulling is adopted for reinforcing a water inlet channel template. According to the construction method, the condition that a plurality of more complex construction areas are not mutually influenced can be guaranteed, so that the construction period is shortened, the possibility of large-volume concrete cracks is reduced, and the construction accuracy of the whole water inlet channel, the floating deformation resistance of the template in the construction process and the quality of products are better guaranteed. The construction method can be widely applied in construction of the large cast-in-situ reinforced concrete water inlet channel.
Description
Technical field
The present invention relates to a kind of inlet channel job practices.
Background technology
Inlet channel is the intake structure that are built on the raft foundation, and intake is the square-section, dwindle gradually to the delivery port cross section and be bent upwards rounded after and link to each other with spiral case.Conventional small-sized intake strucure simple shape, concreting side measure little, build so the job practices of taking is disposable integral, and more easily guarantee the concrete formation quality.Traditional curved elbow section curvature in CP1000 nuclear power station inlet channel bottom changes greatly, so the back-grouting district is reserved, the job practices that the later stage uses contraction-free grouting concrete to tamp in the general bottom of adopting.If the curved elbow section of inlet channel curvature changes mild, still adopt the bottom to reserve the job practices in back-grouting district, will exist back-grouting district planar dimension larger, the existence in secondary pouring district, all unfavorable to the continuity that the structural integrity of building moulding and inlet channel bear the current operating pressure.
Summary of the invention
The purpose of this invention is to provide a kind of large cast-in-situ steel reinforced concrete inlet channel job practices, solve traditional inlet channel bottom and reserve the job practices in back-grouting district to the disadvantageous technical problem of the continuity of structural integrity and water flow pressure; And how the concrete one-time-concreting moulding of the solution inlet channel whole body guarantees the problem of pouring quality and inlet channel template anti-floating.
Realize above-mentioned purpose, the present invention adopts following technical scheme:
A kind of large cast-in-situ steel reinforced concrete inlet channel job practices, described inlet channel are to be built in the intake structure of bottom on the raft foundation, and its intake is the square-section, dwindle gradually to the delivery port cross section and be bent upwards to link to each other with spiral case after rounded, and step is as follows:
Step 1: bottom, inlet channel zone raft foundation construction;
Step 2: formulate steel concrete inlet channel block placement scheme, inlet channel is divided into inlet channel base plate A piece, far-end bottom, inlet channel curved elbow outside B piece, inlet channel whole body C piece, the curved elbow outside far-end top D piece of inlet channel and inlet channel neck E piece, and its sequence of construction is followed successively by: inlet channel base plate A piece, far-end bottom, inlet channel curved elbow outside B piece, inlet channel whole body C piece, the curved elbow outside far-end top D piece of inlet channel and inlet channel neck E piece;
Step 3: the boundary line of measurement and positioning inlet channel on the raft foundation of bottom;
Step 4: far-end bottom, construct successively inlet channel base plate A piece and inlet channel curved elbow outside B piece, and guarantee the planar dimension of inlet channel base plate A block concrete less than the real size of inlet channel bottom template, and the three-dimensional reinforcing bar of the colligation inlet channel of going ahead of the rest;
Step 5: the inlet channel template is tried assembly unit outside the venue, offer the hole of vibrating in inlet channel bottom template simultaneously, and every 1m several rows of pore is set, be transported to the scene after inlet channel template examination assembly unit is qualified, C piece construction part is carried out assembly unit and adjustment on the inlet channel whole body, and the way that adopts support, drawknot to close is reinforced the inlet channel template;
Step 6: all the other reinforcing bars around the colligation inlet channel, reserve lower manhole during reinforcing bar binding, and be difficult for reaching on the reinforcing bar at place the evenly colligation guiding device that vibrates different in size at vibrating spear, then placement layer by layer inlet channel zone inlet channel whole body C block concrete, when building, the casting and compacting of concrete manhole of reserving on the C piece reinforcing bar of the inlet channel whole body stretches into vibrating spear in the guiding device that vibrates and vibrates, concrete in curved elbow curved portion has whenever watered one deck, stop pumping, vibrating and leaving standstill is no less than half an hour, and within 2 hours lower-layer concrete is covered;
Step 7: the C block concrete maintenance expiration of the inlet channel whole body and reach design strength after remove inlet channel template before the inlet channel bending section;
Step 8: far-end top, construction inlet channel curved elbow outside D piece, the D piece also can be constructed before the C piece;
Step 9: construction inlet channel neck E piece, the concrete of inlet channel neck E piece is removed remainder inlet channel template after reaching design strength.
In the described step 2, the construction of far-end top, inlet channel curved elbow outside D piece can be carried out before or after the C piece construction of the inlet channel whole body.
Be embedded with the earth anchor that supports shaped steel and be used for anti-floating on the raft foundation of bottom, described step 1 inlet channel zone, the end face concrete artificial chiseling of bottom raft foundation forms even, coarse working face.
Described step 5 and six arranges row's limit for height batten in inlet channel template inboard every 0.4m, and the inlet channel whole body C block concrete amount of building hourly must not be greater than the spacing of limit for height batten.
Described step 4 is embedded with steel bowl and high-strength bolt for tension inlet channel bottom template on the inlet channel base plate A piece, described steel bowl and high-strength bolt difference or combination arrange.
The 1:1 setting-out on the inlet channel steelframe model that is building first before the colligation of the three-dimensional reinforcing bar of inlet channel is made in the described step 4.
In the described step 5, described inlet channel template is carried out assembly unit according to the sequencing of the template numbering of examination during assembly unit, the way that described support, drawknot close refers to by anti-floating wire rope and the earth anchor drawknot that is embedded on the raft foundation of inlet channel bottom, by being embedded in the support shaped steel support top on the raft foundation of bottom, be lined with concrete pad between described anti-floating wire rope and the inlet channel template simultaneously.
In the described step 6, the spiral spring pipe of the guiding device that vibrates for being formed by the reinforcing bar bending, its diameter is 100mm～120mm.
The concrete of inlet channel whole body C piece and described step 9 inlet channel neck E piece is that slump is the large slump concrete of 180mm～200mm in the described step 6, mixes corrosion inhibitor and polyacrylic fibre in it.
Described step 9, inlet channel neck E piece be by being provided with waterstop on inlet channel one side, and the inlet channel neck E piece top in the described waterstop outside is embedded with for the fixing standing screw of volute template base and volute template keel.
Compared with prior art the present invention has following characteristics and beneficial effect:
(1), the present invention can be effectively keeps apart the pipe-line system such as inlet channel working face and the female pipe of SEN/CFI suction that carries out the same period and the construction of drum barrier, guarantees that a plurality of comparatively construction areas of complexity can not influence each other and cause the serious consequence of delaying the duration.
(2), by the comparatively steel concrete of rule of constructing first around the inlet channel, be that favourable work plane is created in the construction of the positions such as pipeline, reach the effect of reduction of erection time.
(3), after the inlet channel bottom slab concreting is finished, directly inlet channel whole body concrete is carried out once whole watering, be conducive to guarantee that inlet channel bears the continuity of current operating pressure and the globality of structure, for the Forming Quality of inlet channel and use function all to have good result.
(4), the inlet channel piecemeal evenly, effectively build and the measure of vibrating, and reliable maintenance measure of later stage, make concrete temperature be controlled at perfect condition, reduce the possibility of Volume Concrete Cracks, guaranteed concrete construction quality, guaranteed the application life of reinforced concrete structure.
(5), reserve construction in later period with the inlet channel neck piecemeal of equipment interconnection, construction precision and the difficulty action accomplishment for whole inlet channel all is strong assurance.
(6), the installation of vibrate hole and the guiding device of concrete vibrator on the inlet channel template, make the also effective cloth and vibrating of concrete that is difficult to build the position, reduce to greatest extent the generation of the mass defects such as the concrete leakage is shaken, voids and pits, thereby guaranteed product quality.
(7), above inlet channel and periphery the shaped steel of enough rigidity is set, the measure of anti float such as high-strength bolt, change single wire rope anti-floating pattern, rigidity and the anti-deformation ability of anti-floating member have been improved, reduce the risk that the large-size deviation appears in the finished product concrete, improved the formed precision of product.
(8), in the invention work progress, the planar dimension of inlet channel base plate A block concrete is less than the real size of inlet channel bottom template, avoided having formed an acute angle with far-end bottom, inlet channel curved elbow outside B block concrete after template is built the last layer concrete, it is closely knit to cause concrete to build.
The present invention can be widely used in the construction of nuclear power station large-sized concrete inlet channel.
Description of drawings
The present invention will be further described in detail below in conjunction with accompanying drawing.
Fig. 1 is inlet channel plan-position figure.
Fig. 2 is that inlet channel surrounding concrete construction piece is divided schematic diagram.
Fig. 3 is inlet channel formwork reinforcement measure floor map.
Fig. 4 is inlet channel formwork reinforcement measure elevation.
Fig. 5 is the sectional view of Fig. 4.
Fig. 6 is inlet channel whole body C piece layering schematic diagram.
Fig. 7 is servant's pore size distribution schematic diagram.
Fig. 8 is the feed opening distribution schematic diagram.
Fig. 9 is the inlet channel whole body C piece guiding device distribution plan view that vibrates.
Figure 10 is the inlet channel whole body C piece guiding device profile figure that vibrates.
Figure 11 is inlet channel neck E piece top detail drawing.
Reference numeral: 1-inlet channel, 2-bottom raft foundation, 3-support manhole, 13-standing screw, 14-concrete pad, 15-volute template keel, 16-volute template base, 17-blanking hole under shaped steel, the pre-buried anchor ring of 4-, the pre-buried steel bowl of 5-and screw rod, 6-waterstop, 7-embedded bar head, the pre-buried high-strength bolt of 8-, 9-anti-floating wire rope, 10-inlet channel template, 11-vibrator guiding device, the 12-.
The specific embodiment
A kind of large cast-in-situ steel reinforced concrete inlet channel job practices, described inlet channel is the intake structure that are built on the raft foundation 2 of bottom, its intake is the square-section, dwindle gradually to the delivery port cross section and be bent upwards and link to each other with spiral case after rounded, its plane distribution position is referring to Fig. 1, inlet channel is a runner in the monoblock raft foundation, its upper end connects spiral case by a circular hole, square hole position, bottom connects chamber, the cone-shaped pipe that the chamber both sides show respectively on the south the inlet channel among the figure and circular pipe are respectively CFI pump line and SEN pump line, and the chamber that these two pipelines are adjacent with inlet channel links to each other.Its construction sequence is as follows:
Step 1: bottom, inlet channel zone raft foundation 2 constructions; Be embedded with the earth anchor that supports shaped steel 3 and be used for anti-floating on the raft foundation of bottom, inlet channel zone, the end face concrete artificial chiseling of bottom raft foundation forms even, coarse working face.Described earth anchor comprises pre-buried anchor ring 4, pre-buried steel bowl and screw rod 5, embedded bar head 7 and pre-buried high-strength bolt 8, more than several earth anchor forms can respectively or be combined with.
Step 3: the boundary line of measurement and positioning inlet channel 1 on bottom raft foundation 2;
Step 4: far-end bottom, construct successively inlet channel base plate A piece and inlet channel curved elbow outside B piece, and guarantee the planar dimension of inlet channel base plate A block concrete less than the real size of inlet channel bottom template, and the three-dimensional reinforcing bar of the colligation inlet channel of going ahead of the rest; Be embedded with steel bowl and high-strength bolt for tension inlet channel bottom template on the inlet channel base plate A piece, described steel bowl and high-strength bolt difference or combination arrange.The 1:1 setting-out on the inlet channel steelframe model that is building first before the colligation of the three-dimensional reinforcing bar of inlet channel is made.
The inlet channel template adopts with anti-floating wire rope, flower basket bolt and the Chain block of pre-buried earth anchor drawknot and regulates, can assembling reinforcement to the allowable error scope, and especially exporting circular cross-section place precision must guarantee.
Step 6 is referring to shown in Fig. 6～10, and all the other reinforcing bars around the colligation inlet channel add one deck limit and split steel mesh reinforcement in the reinforcement cover.Reserve lower manhole 12 during reinforcing bar binding, and be difficult for reaching on the reinforcing bar at place the evenly colligation guiding device 11 that vibrates different in size at vibrating spear, then placement layer by layer inlet channel zone inlet channel whole body C block concrete, when building, it is inner that the manhole that the constructor reserves from inlet channel whole body C piece reinforcing bar enters the C piece, in curved elbow curved portion vibrating spear is stretched in the guiding device that vibrates and to vibrate, whenever watered one deck, stop pumping, vibrate and leave standstill and be no less than half an hour, so that concrete is fully closely knit, and within 2 hours, lower-layer concrete is covered; Every 0.4m one row's limit for height batten is set in inlet channel template inboard, the inlet channel whole body C block concrete amount of building hourly must not be greater than the spacing of limit for height batten.The described spiral spring pipe of guiding device 11 for being formed by the reinforcing bar bending that vibrate, its diameter is 100mm～120mm.Its concrete is that slump is the large slump concrete of 180mm～200mm, mixes corrosion inhibitor and polyacrylic fibre in it.The pvc pipe that diameter 150 is set at inlet channel whole body steel mesh reinforcement inserts below the bottom layer of the reinforcing steel as feed opening 17, up carries while building in casting process; Guarantee that the concrete free-falling highly is not more than 2m, and the hand that vibrates arranges a plurality of lower manholes 12 and enters bottom layer of the reinforcing steel and vibrate from being arranged on inlet channel whole body C piece steel bar layer.In this block concrete casting process, need fully to vibrate to curved elbow section below concrete by vibrate hole and guiding device of concrete vibrator, and in casting process, constantly knock the bottom template by the special messenger, judge whether to occur hollowing, leak the phenomenon such as shake.When overflowing in a large number the non-cement paste of concrete from vibrate hole and steam vent, namely immediately perforate is gone out to seal, to guarantee the forming shape of inlet channel.
Step 7: the C block concrete maintenance expiration of the inlet channel whole body and reach design strength after remove inlet channel template before the inlet channel bending section; Because neck is not yet constructed, thus curved elbow section position template and support kept, in order to avoid the neck template produces and displacement.
Step 8: far-end top, construction inlet channel curved elbow outside D piece; Can be pipe-line system installation and the construction of drum barrier carried out simultaneously and created operation side.
Adopt the mode of scaffolding insulation, comprehensive regenerative process to carry out maintenance in the concrete curing process in above-mentioned each block concrete work progress, electronic instrument for measuring temperature is carried out dynamic monitoring to temperature, carry out adjustment in the mode of establishing iodine-tungsten lamp in plus-minus covering and heat insulating layer and the canopy, moisturizing is carried out in watering.
Claims (8)
1. large cast-in-situ steel reinforced concrete inlet channel job practices, described inlet channel is the intake structure that are built on the bottom raft foundation (2), its intake is the square-section, dwindles gradually to the delivery port cross section and be bent upwards to link to each other with spiral case after rounded, and it is characterized in that: step is as follows:
Step 1: inlet channel zone bottom raft foundation (2) construction;
Step 2: formulate steel concrete inlet channel block placement scheme, inlet channel is divided into inlet channel base plate A piece, far-end bottom, inlet channel curved elbow outside B piece, inlet channel whole body C piece, the curved elbow outside far-end top D piece of inlet channel and inlet channel neck E piece, and its sequence of construction is followed successively by: inlet channel base plate A piece, far-end bottom, inlet channel curved elbow outside B piece, inlet channel whole body C piece, the curved elbow outside far-end top D piece of inlet channel and inlet channel neck E piece;
Step 3: in the boundary line of the upper measurement and positioning inlet channel (1) of bottom raft foundation (2);
Step 4: far-end bottom, construct successively inlet channel base plate A piece and inlet channel curved elbow outside B piece, and guarantee the planar dimension of inlet channel base plate A block concrete less than the real size of inlet channel bottom template, and the three-dimensional reinforcing bar of the colligation inlet channel of going ahead of the rest;
In the described step 4, be embedded with steel bowl and high-strength bolt for tension inlet channel bottom template on the inlet channel base plate A piece, described steel bowl and high-strength bolt difference or combination arrange;
Step 5: inlet channel template (10) is tried assembly unit outside the venue, offer the hole of vibrating in inlet channel bottom template simultaneously, and every 1m several rows of pore is set, be transported to the scene after inlet channel template (10) examination assembly unit is qualified, C piece construction part is carried out assembly unit and adjustment on the inlet channel whole body, and the way that adopts support, drawknot to close is reinforced the inlet channel template;
Step 6: all the other reinforcing bars around the colligation inlet channel, also reserve lower manhole (12) during reinforcing bar binding, and be difficult for reaching on the reinforcing bar at place the evenly colligation guiding device that vibrates (11) different in size at vibrating spear, then placement layer by layer inlet channel zone inlet channel whole body C block concrete, when building, it is inner that the manhole that the constructor reserves from inlet channel whole body C piece reinforcing bar enters the C piece, vibrating spear stretched in the guiding device that vibrates the curved elbow curved portion of inlet channel is vibrated, whenever watered one deck in curved elbow curved portion, stop pumping, vibrating and leaving standstill is no less than half an hour, so that concrete is fully closely knit, and within 2 hours lower-layer concrete is covered;
In the described step 6, the spiral spring pipe of the guiding device that vibrates (11) for being formed by the reinforcing bar bending, its diameter is 100mm～120mm;
Step 7: the C block concrete maintenance expiration of the inlet channel whole body and reach design strength after remove inlet channel template before the inlet channel bending section;
Step 8: far-end top, construction inlet channel curved elbow outside D piece;
Step 9: construction inlet channel neck E piece, the concrete of inlet channel neck E piece is removed remainder inlet channel template after reaching design strength.
2. large cast-in-situ steel reinforced concrete inlet channel job practices according to claim 1 is characterized in that: in the described step 2, far-end top, inlet channel curved elbow outside D piece was constructed before the C piece of the inlet channel whole body.
3. large cast-in-situ steel reinforced concrete inlet channel job practices according to claim 1 and 2, it is characterized in that: be embedded with the earth anchor that supports shaped steel (3) and be used for anti-floating on the raft foundation of bottom, inlet channel zone in the described step 1, the end face concrete artificial chiseling of bottom raft foundation forms even, coarse working face.
4. large cast-in-situ steel reinforced concrete inlet channel job practices according to claim 1 and 2, it is characterized in that: in the described step 5 and six, every 0.4m one row's limit for height batten is set in inlet channel template inboard, the inlet channel whole body C block concrete amount of building hourly must not be greater than the spacing of limit for height batten.
5. large cast-in-situ steel reinforced concrete inlet channel job practices according to claim 1 and 2 is characterized in that: the three-dimensional reinforcing bar of inlet channel 1:1 setting-out making on the inlet channel steelframe model that is building first before the colligation in the described step 4.
6. large cast-in-situ steel reinforced concrete inlet channel job practices according to claim 1 and 2, it is characterized in that: in the described step 5, described inlet channel template is carried out assembly unit according to the sequencing of the template numbering of examination during assembly unit, the way that described support, drawknot close refers to by anti-floating wire rope (9) and the earth anchor drawknot that is embedded on the raft foundation of inlet channel bottom, by being embedded in support shaped steel (3) support top on the raft foundation of bottom, be lined with concrete pad (14) between described anti-floating wire rope (9) and the inlet channel template (10) simultaneously.
7. large cast-in-situ steel reinforced concrete inlet channel job practices according to claim 1 and 2, it is characterized in that: in the described step 6 in inlet channel whole body C piece and the described step 9 concrete of inlet channel neck E piece be that slump is the large slump concrete of 180mm～200mm, mix corrosion inhibitor and polyacrylic fibre in it.
8. large cast-in-situ steel reinforced concrete inlet channel job practices according to claim 1 and 2, it is characterized in that: in the described step 9, inlet channel neck E piece is by being provided with waterstop (6) on inlet channel one side, and the inlet channel neck E piece top in described waterstop (6) outside is embedded with for the fixing standing screw (13) of volute template base (16) and volute template keel (15).
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| CN102535404B (en) * | 2012-01-11 | 2014-04-09 | 中国建筑第二工程局有限公司 | Construction device and construction method for steep segment of circulating pipe ditch |
| CN103174113A (en) * | 2013-03-15 | 2013-06-26 | 田波 | Multifunctional land ditch building construction method |
| CN104099913B (en) * | 2014-07-15 | 2015-10-28 | 淮安市水利规划办公室 | Power station inlet and outlet channel concrete surface sealing process |
| CN105064398A (en) * | 2015-08-19 | 2015-11-18 | 中国能源建设集团天津电力建设有限公司 | One-time overall pouring construction method for nuclear powder single-hole GD gallery |
| CN110284708A (en) * | 2019-07-04 | 2019-09-27 | 中建六局建设发展有限公司 | A kind of concrete construction method for full-scale wind tunnel circle change side's diffuser |
| CN111074852B (en) * | 2019-12-20 | 2021-10-12 | 湖北锦天禹建设工程有限公司 | Channel lining concrete cast-in-place method and nonlinear channel lining construction method |
| CN113062325B (en) * | 2021-03-25 | 2022-08-19 | 李阳 | Concrete pouring method for water inlet runner |
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| CN200961255Y (en) * | 2006-06-20 | 2007-10-17 | 王振铎 | Spliced aqueduct |
| KR100767729B1 (en) * | 2007-03-21 | 2007-10-17 | 한산콘크리트(주) | Flume duct for preserving ecosystem |
| CN101392515A (en) * | 2008-11-11 | 2009-03-25 | 武汉理工大学 | Channel thermal insulation structure and construction method thereof |
| CN101476308A (en) * | 2009-01-24 | 2009-07-08 | 中国建筑第二工程局有限公司 | Construction method for large cast-in-situ steel reinforced concrete inlet channel and turbine housing |
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Patent Citations (4)
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|---|---|---|---|---|
| CN200961255Y (en) * | 2006-06-20 | 2007-10-17 | 王振铎 | Spliced aqueduct |
| KR100767729B1 (en) * | 2007-03-21 | 2007-10-17 | 한산콘크리트(주) | Flume duct for preserving ecosystem |
| CN101392515A (en) * | 2008-11-11 | 2009-03-25 | 武汉理工大学 | Channel thermal insulation structure and construction method thereof |
| CN101476308A (en) * | 2009-01-24 | 2009-07-08 | 中国建筑第二工程局有限公司 | Construction method for large cast-in-situ steel reinforced concrete inlet channel and turbine housing |
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