CN113818403A - Construction method for constructing concrete hyperbolic arch dam by using excavation materials to replace stock ground - Google Patents
Construction method for constructing concrete hyperbolic arch dam by using excavation materials to replace stock ground Download PDFInfo
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- CN113818403A CN113818403A CN202111054714.7A CN202111054714A CN113818403A CN 113818403 A CN113818403 A CN 113818403A CN 202111054714 A CN202111054714 A CN 202111054714A CN 113818403 A CN113818403 A CN 113818403A
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- 238000010276 construction Methods 0.000 title claims abstract description 95
- 239000011798 excavation material Substances 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 61
- 239000004575 stone Substances 0.000 claims abstract description 41
- 238000003860 storage Methods 0.000 claims abstract description 28
- 239000004576 sand Substances 0.000 claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
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- 229910052742 iron Inorganic materials 0.000 description 6
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
- E02B7/02—Fixed barrages
- E02B7/04—Dams across valleys
- E02B7/08—Wall dams
- E02B7/12—Arch dams
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention relates to the technical field of dam engineering construction, in particular to a construction method for constructing a concrete hyperbolic arch dam by using excavation materials to replace a stock ground. The method comprises the following steps: a. b, classifying and stacking soil and rocks by using a reservoir area or other land areas, adjusting unbalance between rock ballast excavation and concrete pouring by using a temporary storage yard, and solving the residual of the maximum quarterly accumulated useful materials, namely the capacity of the temporary storage yard; c. according to the calculated capacity of the temporary storage yard, the construction total arrangement and the sandstone processing system arrangement are combined to arrange the temporary storage yard; d. the temporary storage yard is arranged close to a coarse crushing workshop of the sand and stone processing system, so that the transportation distance for recovering the rough materials is reduced; e. arranging a concrete mixing station beside a useful sand and stone material yard, and transporting to each construction working surface by adopting a concrete tank truck; f. grouting dam abutment of the dam, measuring the dam and preparing materials; g. and carrying out concrete construction on the dam body of the dam.
Description
Technical Field
The invention relates to the technical field of dam engineering construction, in particular to a construction method for constructing a concrete hyperbolic arch dam by using excavation materials to replace a stock ground.
Background
Engineering construction usually has a large amount of excavated ballast for waste slag treatment. A large amount of engineering waste slag needs to be piled up in a field, protected and well provided with drainage facilities. The adverse effect of the waste slag on the ecological environment is not adapted to the requirements of building green hydropower station engineering. In order to reduce the influence of the engineering waste slag on the natural environment as much as possible, the research and the application of the comprehensive utilization technology of the stone slag for building excavation need to be emphasized. The main research of this patent is how to utilize the building to excavate the stone sediment preparation concrete aggregate to construct hyperbolic arch dam.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method for constructing a concrete hyperbolic arch dam by using excavation materials to replace a stock ground so as to solve the problems in the background technology.
In order to solve the technical problems, the technical scheme of the invention is as follows: a construction method for constructing a concrete hyperbolic arch dam by using excavation materials to replace a stock ground comprises the following steps:
a. identifying the excavated materials, placing the excavated materials in a useful material storage area after being identified as useful materials, and taking the excavated materials as a material source for filling the dam body;
b. the method comprises the following steps of stacking soil and rocks in a regional classification mode by using land areas of a reservoir area or other hub areas, adjusting unbalance between stone slag excavation and concrete pouring by a temporary storage area, and calculating the residual of the accumulated useful materials of the maximum quarter according to the quarterly or monthly excavation strength and availability of stone materials of main engineering, quarterly or monthly concrete pouring strength, conversion of concrete and stone squares required by processing aggregates, conversion of natural squares, loose squares and compacted squares of the stone materials, namely the capacity (loose square) of the temporary storage area;
c. selecting a relatively flat field as a temporary storage yard according to the calculated capacity of the temporary storage yard by combining the total construction layout and the sand and stone processing system layout planning;
d. the temporary storage yard is arranged close to a coarse crushing workshop of the sand and stone processing system, so that the transportation distance for recovering the rough materials is reduced;
e. arranging a concrete mixing station beside a useful sand and stone material yard, and transporting to each construction working surface by adopting a concrete tank truck;
f. grouting dam abutment of the dam, measuring the dam and preparing materials;
g. and carrying out concrete construction on the dam body of the dam.
The dam concrete pouring method is characterized in that transverse joint positions are set according to design in dam concrete pouring, vertical trapezoidal key grooves are arranged on joint faces, the distance between the transverse joints is generally 15-16 m, each construction section is divided into a plurality of blocks for construction, the height of each block is 2m, and a circulating cooling water pipe is arranged in each construction block.
Concrete construction is carried out on the dam body of the dam by the concrete construction method, which comprises the following specific steps:
1) treating dam abutment concrete foundation surface or construction joint;
2) erecting the template;
3) constructing an embedded part;
4) constructing concrete;
5) and (5) concrete temperature control measures.
The formwork erection comprises a mode of combining a steel combined formwork with a wood formwork, the steel combined formwork is adopted for large-area pouring of the dam, and the wood formwork is adopted for concrete pouring on an overflow surface, a water intake and a local special-shaped part.
The useful materials include sand, fine stone, medium stone and large stone.
The concrete construction method comprises the following steps: and conveying the mixture, stirring by adopting a stirrer, conveying to a tower crane, hoisting and warehousing by the tower crane, leveling and vibrating, and finally maintaining.
Before the leveling and vibrating, a layer of cement mortar with the same grade is paved on the foundation surface according to the pouring strength, wherein the thickness of the cement mortar is 2-3 mm, and the cooling water pipe is covered when the mortar is paved.
The vibration adopts a layered pouring construction mode, and a high-frequency vibrator vibrates.
Compared with the prior art, the invention has the beneficial effects that:
the method utilizes the stone slag and soil dug out by engineering construction in a normal time, collects the useful materials and stacks the useful materials according to the rules, and utilizes the materials to construct the dam, thereby solving the problems that a large amount of engineering waste slag needs to be stacked in a field in the prior engineering, needs to be protected and well provided with drainage facilities, the adverse effect of the waste slag on the ecological environment is not adapted to the requirement of building green water conservancy and hydropower engineering, and the redundant soil can be used for greening application; the construction method is adopted to construct the hyperbolic arch dam, so that the construction cost is low, the construction efficiency is high, and the construction cost of an enterprise is reduced.
Drawings
FIG. 1 is a flow chart of the concrete construction process of the present invention;
FIG. 2 is a schematic view of the layered pouring of concrete according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention relates to a construction method for constructing a concrete hyperbolic arch dam by using excavation materials to replace a stock ground, which comprises the following steps:
a. identifying the excavated materials, placing the excavated materials in a useful material storage area after being identified as useful materials, and taking the excavated materials as a material source for filling the dam body;
b. the method comprises the following steps of stacking soil and rocks in a regional classification mode by using land areas of a reservoir area or other hub areas, adjusting unbalance between stone slag excavation and concrete pouring by a temporary storage area, and calculating the residual of the accumulated useful materials of the maximum quarter according to the quarterly or monthly excavation strength and availability of stone materials of main engineering, quarterly or monthly concrete pouring strength, conversion of concrete and stone squares required by processing aggregates, conversion of natural squares, loose squares and compacted squares of the stone materials, namely the capacity (loose square) of the temporary storage area;
c. selecting a relatively flat field as a temporary storage yard according to the calculated capacity of the temporary storage yard by combining the total construction layout and the sand and stone processing system layout planning;
d. the temporary storage yard is arranged close to a coarse crushing workshop of the sand and stone processing system, so that the transportation distance for recovering the rough materials is reduced;
e. arranging a concrete mixing station beside a useful sand and stone material yard, and transporting to each construction working surface by adopting a concrete tank truck;
f. grouting dam abutment of the dam, measuring the dam and preparing materials;
g. and carrying out concrete construction on the dam body of the dam.
The present invention will be described in detail with reference to the following examples in practice.
Examples
Selecting a hyperbolic arch dam designed to be constructed, identifying excavated materials, placing the excavated materials in a useful material stockpiling area after being identified as useful materials, and taking the excavated materials as a material source for filling a dam body;
during the construction of engineering, 1500-2000m is prepared at any time3The sandstone aggregate is reserved in a stockyard, is inspected and then used, and simultaneously ensures the progress of the project;
the method comprises the following steps of stacking soil and rocks in a regional classification mode by using land areas of a reservoir area or other hub areas, adjusting unbalance between stone slag excavation and concrete pouring by a temporary storage area, and calculating the residual of the accumulated useful materials of the maximum quarter according to the quarterly or monthly excavation strength and availability of stone materials of main engineering, quarterly or monthly concrete pouring strength, conversion of concrete and stone squares required by processing aggregates, conversion of natural squares, loose squares and compacted squares of the stone materials, namely the capacity (loose square) of the temporary storage area; root of herbaceous plant
Selecting a relatively flat field as a temporary storage field according to the calculated capacity of the temporary storage field by combining the total construction arrangement and the sand and stone processing system arrangement planning;
the temporary storage yard is arranged close to a coarse crushing workshop of the sand and stone processing system, so that the transportation distance for recovering the rough materials is reduced;
arranging a concrete mixing station beside a useful sand and stone material yard, and transporting to each construction working surface by adopting a concrete tank truck;
grouting dam abutment of the dam, measuring the dam and preparing materials;
carrying out concrete construction on the dam body of the dam;
the dam concrete pouring adopts a block and layer construction method, transverse joint positions are set according to design in the dam concrete pouring, vertical trapezoidal key grooves are arranged on joint surfaces, the distance between the transverse joints is generally 15-16 m, each construction section is divided into a plurality of blocks for construction, the height of each block is 2m, and a circulating cooling water pipe is arranged in each construction block. And constructing the joint grouting pipe, the grout lifting hole, the grout stopping sheet, the exhaust groove and the like strictly according to design requirements.
(1) Dam abutment concrete foundation surface or construction joint treatment
The concrete foundation surface or construction joint needs to be processed according to design and the 'water conservancy and hydropower engineering construction specification', the processed foundation surface or construction joint should be a rough surface without loose rock, accumulated slag, sundries, water collection and the like, and the over-excavation and under-excavation of the foundation surface need to meet the specified standards of the design and specification.
(2) Formwork erection
The method adopts a mode of combining a steel combined template with a wood mold, the steel combined template is adopted for large-area pouring of the dam, and the wood mold is adopted for concrete pouring on an overflow surface, a water intake and a local special-shaped part.
And in the template erecting mode, when the template of the ascending block is poured firstly in the dam and is installed, a key groove template and a fixed grout stopping sheet are installed on the transverse seam template, and the distance between the grout stopping sheet and the dam face of the upstream and downstream is about 30 cm. After the template is reinforced, a semicircular pipe with the diameter of 3cm is required to be fixed on the transverse seam template, the position of the semicircular pipe is arranged according to the design, and if a cooling water pipe is required to be embedded, inlet and outlet holes of the cooling water pipe are reserved.
The construction of the overflow surface concrete mainly comprises the following steps: the concrete pouring construction method is characterized in that concrete pouring construction is carried out by adopting a steel mould and a wood mould according to concrete design section sizes of each part, overflow head concrete, overflow surface concrete, gate pier concrete and other part detailed concrete. When the concrete is poured 1-2 m away from the overflow surface bottom plate, the embedded parts need to be arranged, so that the overflow surface concrete template can be erected and reinforced conveniently.
(3) Construction of embedded parts
1) Construction of cooling water pipe
The cooling facility arrangement is made according to the design. Galvanized seamless steel pipes are generally used as cooling water pipes, the cooling water pipes are arranged in a snake shape, and the horizontal distance is about 1.5 m. The water pipes are arranged on the upper bin concrete layer surface and the lower bin concrete layer surface, the water pipes are arranged in a quincunx shape in the vertical direction, when front bin concrete construction is carried out, the pipeline embedded iron pieces are arranged according to the water pipes, the cooling water pipes are fixed on the embedded iron pieces, vibration dislocation during pouring is prevented, a water test is needed before the cooling water pipes are installed and concrete pouring is carried out, and the cooling water pipes are guaranteed to be smooth and water-tight.
The cooling water pipes of the same dam block at each elevation respectively use a water inlet header pipe and a water outlet header pipe, the header pipes are arranged at the downstream side of the dam and are connected with the coiled pipes at each elevation by adopting three-way joints, and flow meters are arranged at the inlet and the outlet of the header pipes.
Construction of joint grouting water-stopping and grout-stopping facilities
When carrying out dam body concrete construction, set up joint grouting system, adopt tube drawing formula joint grouting facility, include: slurry lifting tank, slurry inlet and outlet pipe, exhaust tank, slurry stop sheet, water stop belt, thermometer and crack meter.
The air exhaust and slurry raising soft plastic pipe drawing must be arranged on the seam. When the dam body concrete construction is carried out, the upstream water stop belt and the downstream grout stop sheet are arranged when the block concrete formwork is poured at the transverse joint first, and when the dam body concrete construction is constructed to the top layer of a grouting area, the horizontal grout stop sheet is arranged. After the template is reinforced, a semicircular pipe with the diameter of 3cm is arranged at the designed grout lifting groove, iron nails are embedded at the periphery of the semicircular pipe so as to facilitate the reinforcement of the plastic pipe drawing, and the semicircular pipe with the diameter of 3cm is embedded at the bottom and the top of the grouting area close to the template so as to facilitate the arrangement of the grout inlet pipe, the grout outlet pipe and the air exhaust groove.
Before the post-cast block concrete at the transverse joint is poured, a grouting slurry lifting pull pipe is installed firstly, and the post-cast block concrete is fixed at a designed position by using a lead wire. Before the post-cast block rises, the post-cast block is inflated again and then is tightly connected with the slurry inlet pipe tee. The pipe drawing time is determined by field tests according to the conditions of the material, the concrete state, the air temperature and the like of the plastic hose.
Before the post-pouring block of the middle layer of the irrigation area rises, the pipe drawing is inserted into the hard plastic pipe exposed at the lower part, the subsequent process is the same as the starting layer, when the concrete rises to the end of the irrigation area, the pipe drawing installation process is basically the same as the middle layer of the irrigation area, but when the distance is about 1m from the exhaust groove, the plastic hose embedded in the semicircular groove needs to be inclined, the pipe drawing extends out from the position 0.3 m-0.5 m away from the joint surface, when the concrete pouring is finished and the pipe drawing is finished, the hole pipe is washed clean, and the hole opening is blocked by using a wooden plug and cotton.
The top exhaust groove of the irrigation area is formed by two plastic pipes. Firstly, reserving two semicircular grooves with the diameter of 3cm and pre-buried iron nails at the exhaust groove part of the pre-cast block. Because the exhaust groove is too long, in order to reduce the pipe drawing resistance, two plastic drawing pipes are disconnected from the middle, a seal head is added, the plastic drawing pipes are inflated, two sections of hard plastic pipes are fixedly sleeved in a semicircular groove of the first pouring block, a tee joint is installed to lead out the exhaust pipes, the exhaust pipes are respectively led out from two ends of the pouring surface, the pipe is deflated and drawn after the post-pouring block is poured for 1-3 days, and the orifice is sealed after the hole pipe is washed clean.
When the device is installed, the grout-rising plastic pipes in the same grouting area must be continuously straight on the upper concrete pouring layer and the lower concrete pouring layer, if the direction needs to be changed, the gradual change principle is strictly followed, and the embedded iron nails are used for binding lead wires to fix the pipelines, so that the pipe drawing is facilitated, and the grouting quality is ensured.
(4) Concrete construction
1) Concrete storehouse surface block description
In order to ensure the forming radian and appearance of the dam face, the height of each block is uniformly determined to be 2m when the dam face of the dam is poured, and the length of each block is combined with the position of a designed transverse seam. The dam transverse seams are mainly arranged at the positions of 0+14.348m of dam transverse, 0+36.876m of dam transverse and 0+53.422m of dam transverse, and three transverse seams are arranged in total.
2) Mixing of concrete
And (5) stirring the concrete by adopting a stirring station. The mixing station is provided with a 1.0m mixing station3Forced mixer with production rate of 30-40 m/hr3(ii) a The batching adopts an automatic weighing, feeding and distributing system, and is centralized in a central control room for adjustment and control. Mixing water and additives are respectively provided by a water pump, the mixture is weighed by a water scale and enters a mixer, cement and fly ash are fed by a screw conveyor, aggregate is fed by a belt conveyor, and a sunshade rain shed needs to be arranged on the conveying belt.
3) Concrete transportation warehousing
The distance between the concrete mixing stations and the dam is about 1 kilometer, so that the concrete transportation is carried out by road transportation and vertical lifting and warehousing. Because the river valley is narrow, the rotation angle of the tower crane is small, and part of the bin surface needs to be transported in the bin surface. The method is carried out by adopting a concrete tank truck transportation mode and a tower crane vertical transportation mode.
Since the valley is narrow, the concrete will be vertically transported into the warehouse using an 80 t.m self-elevating tower crane. The suspension tank is processed into a volume of 0.8m3And 1m3And during pouring, the suspension tank is used according to the distance between the surface of the pouring bin and the tower crane, and concrete is put into the bin as much as possible at one time.
6) Concrete flat bin vibration
Manual leveling and high-frequency vibrator vibration are adopted. Before concrete pouring, a layer of cement mortar with the same grade is paved on the foundation surface according to the pouring strength, the thickness of the cement mortar is 2-3 mm, and the cooling water pipe is covered when the mortar is paved, so that the phenomenon that the cooling effect is influenced because the aggregate is broken or the cooling water pipe is deformed when the concrete is unloaded is avoided. Because the tower crane is adopted to lift the concrete into the bin, the concrete can be uniformly unloaded according to the distribution condition of a pouring surface so as to reduce the workload of the flat bin, when a transverse seam part is poured, special attention should be paid to protecting the seam grouting pre-embedded facilities, and the manual flat bin is mainly adopted except an upstream water stop belt and a downstream grout stop sheet, so that the distance between the discharge hopper and the upstream water stop belt cannot be too close to avoid damage and deformation to the discharge hopper.
As shown in figure 2, a construction mode of layered pouring is adopted, a high-frequency vibrator vibrates, in order to avoid influence of cold seams on construction quality, a first layer is poured in a layered mode and tiled for 5m (a lower figure I area), and the work amount is 32m3Consuming 1 hour, then constructing (area II of the lower graph), laying for 3m, and setting the engineering quantity to be 19m3It takes 40 minutes, then construction (zone III in the lower drawing) is carried out, the tile is spread for 5m, and the engineering quantity is 32m3And the time is 1 hour, part of concrete in the area I is not covered, but the interval time is 2 hours, the initial setting time of the concrete is calculated according to 4 hours, and the part of the area I is not initially set. Then constructing a III area, tiling for 5m, and setting the engineering quantity to be 32m3Consuming 60 minutes, constructing an IV area, paving for 5m, and setting the engineering quantity to be 32m3Consuming 60 minutes, constructing a V-shaped area, paving for 5m, and setting the engineering quantity to be 32m360 minutes later, constructing a VI area, laying horizontally for 5m, and setting the engineering quantity to be 32m3The concrete in the third area is not initially solidified for 3 hours, then the areas VIII, IX and X are paved according to the width of meter, which is a cyclic process, and when the area X is completely paved, the areas VII and X are pavedThe interval time of the concrete is 3.5 hours, the concrete is not initially set, the layering thickness is 50-60 cm, the concrete must be vibrated without leakage or excessive vibration, and the concrete is vibrated until the concrete begins to be grouted without sinking.
The construction is carried out according to the pouring mode, cold joints do not appear, and the pouring principle of layered staggered joints can be achieved.
According to the embodiment, all links of aggregate processing, concrete mixing, concrete transportation, concrete lifting and concrete warehousing and pouring can be guaranteed, progress is correspondingly guaranteed, and construction efficiency is improved.
When the concrete pouring of one bin is finished and the concrete of the surface layer is gradually solidified, the surface of the bin is roughened by high-pressure air, a water gun, manpower and the like, and the roughening depth is 1-2 cm.
7) Concrete curing
After the concrete pouring of each bin is finished, carrying out water-passing maintenance on a cooling water pipe, wherein the continuous water-passing time is 15 days, and water is passed through the water inlet and the water outlet once every day in an exchange flow direction; and (3) after the concrete is poured for 12-18 hours, performing watering maintenance on the surface of the concrete, and performing watering maintenance in advance if hot and dry weather occurs, wherein the surface of the concrete is kept moist at any time during the maintenance period, and the maintenance time is 14 days.
In order to ensure the smooth construction of the dam concrete, the following concrete temperature control measures are adopted.
1) Performing joint-dividing and layered construction on the dam
Adopting a construction mode of dividing transverse seams, wherein the distance between the transverse seams is 15-17 m; the layer thickness was taken to be 2 m.
2) Reduce the temperature rise of concrete hydration heat
Adopting low hydration heat cement or dam low heat cement; aggregate with large particle size is adopted to improve the grading of the aggregate; adopting low-flow state concrete; the fly ash mixed with the mixed material replaces part of cement, so that the use amount of the cement is reduced; the admixture is added, so that the water cement ratio and the cement consumption are reduced.
3) Reduce the concrete pouring temperature
And (3) reducing the temperature of the aggregate: and stacking the aggregates as high as possible (the height is more than 6m) to make the temperature of the aggregates approach the average temperature of the month, and taking the aggregates of the lower layer to mix with the concrete.
Mixing with low-temperature water: mixing with spring water or river water.
Avoiding construction at a high-temperature time period: when concrete is poured in a high-temperature day in summer, construction in a high-temperature period is avoided, pouring is scheduled from 18 pm to 10 am of the next day, and preparation work before pouring is only carried out in the high-temperature period in the daytime.
Reinforcing management and accelerating construction speed: the pouring construction is set to reduce the transportation distance as much as possible, and multiple transportation is avoided; all construction links are connected and matched, and the concrete pouring covering time is controlled within 2.5 h.
Concrete artificial cooling: the highest temperature of the concrete pouring block is controlled by adopting a method of thin-layer pouring natural heat dissipation and cooling of a cooling water pipe so as to meet the requirements of basic temperature difference, internal and external temperature difference and upper and lower layer temperature difference.
Concrete surface protection: the concrete surface is protected by cotton felt, water spraying and other measures, the gradient temperature of the concrete surface layer and the overlarge internal and external temperature difference can be reduced, the concrete is prevented from being supercooled, the concrete cooling speed is delayed, and the like.
4) The construction of the concrete in rainy season is carried out,
firstly, enough rainproof materials and equipment such as asphalt felt, tarpaulin, water pump, cable, spade, iron wire and the like are prepared for emergency use.
Secondly, various building materials are transported to a construction site in sunny days according to plans so that roads are muddy in rainy days and cannot be transported.
Thirdly, various building materials which are afraid of rain and damp are stored in a warehouse, and a cement warehouse is required to be heightened to the bottom of a material pile according to the height of accumulated water in the warehouse, and generally the height is more than 30 cm. The leakage prevention of the warehouse top and the moisture prevention of the wall surface and the ground are well carried out, the doorway is properly heightened, and necessary heavy rain prevention tools are provided.
Fourthly, building a drainage ditch according to the construction site condition. A flood discharge ditch is arranged at a low-lying place of the field, and once water is available, the flood discharge ditch can be quickly discharged.
Fifthly, building a protective shed for large electromechanical equipment according to the regulations, adding a protective cover for small equipment, and setting lightning protection and grounding devices.
Sixthly, the working surface of the construction in the rainy period is not too large and is finished by stages.
Making good the mixing proportion of mortar and concrete, measuring the water content of sand and stone in the concrete construction in the rainy period due to the fact that the sand and stone are drenched by rain and have large water content, setting out the mixing proportion of the concrete construction to prepare the concrete, and controlling the slump and the consistency of the mortar.
When the concrete is constructed, accumulated water in the template is cleaned, the poured concrete is covered and maintained according to weather conditions, and necessary heavy rain prevention measures are taken to avoid grout flushing and influence on the quality of the concrete.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (8)
1. A construction method for constructing a concrete hyperbolic arch dam by using excavation materials to replace a stock ground is characterized by comprising the following steps:
a. identifying the excavated materials, placing the excavated materials in a useful material storage area after being identified as useful materials, and taking the excavated materials as a material source for filling the dam body;
b. the method comprises the following steps of stacking soil and rocks in a regional classification mode by using land areas of a reservoir area or other hub areas, adjusting unbalance between stone slag excavation and concrete pouring by a temporary storage area, and calculating the residual of the accumulated useful materials of the maximum quarter according to the quarterly or monthly excavation strength and availability of stone materials of main engineering, quarterly or monthly concrete pouring strength, conversion of concrete and stone squares required by processing aggregates, conversion of natural squares, loose squares and compacted squares of the stone materials, namely the capacity (loose square) of the temporary storage area;
c. selecting a relatively flat field as a temporary storage yard according to the calculated capacity of the temporary storage yard by combining the total construction layout and the sand and stone processing system layout planning;
d. the temporary storage yard is arranged close to a coarse crushing workshop of the sand and stone processing system, so that the transportation distance for recovering the rough materials is reduced;
e. arranging a concrete mixing station beside a useful sand and stone material yard, and transporting to each construction working surface by adopting a concrete tank truck;
f. grouting dam abutment of the dam, measuring the dam and preparing materials;
g. and carrying out concrete construction on the dam body of the dam.
2. The construction method for constructing the concrete hyperbolic arch dam by using the excavation material to replace the stock ground according to claim 1, characterized in that: the concrete construction is carried out on the dam body of the dam, and the concrete construction method specifically comprises the following steps: the dam concrete pouring method is characterized in that transverse joint positions are set according to design in dam concrete pouring, vertical trapezoidal key grooves are arranged on joint faces, the distance between the transverse joints is generally 15-16 m, each construction section is divided into a plurality of blocks for construction, the height of each block is 2m, and a circulating cooling water pipe is arranged in each construction block.
3. The construction method for constructing the concrete hyperbolic arch dam by using the excavation material to replace the stock ground according to claim 2, wherein concrete construction is carried out on a dam body of the dam by the concrete steps of:
1) treating dam abutment concrete foundation surface or construction joint;
2) erecting the template;
3) constructing an embedded part;
4) constructing concrete;
5) and (5) concrete temperature control measures.
4. The construction method for constructing the concrete hyperbolic arch dam by using the excavation material to replace the stock ground according to claim 3, characterized in that: the formwork erection comprises a mode of combining a steel combined formwork with a wood formwork, the steel combined formwork is adopted for large-area pouring of the dam, and the wood formwork is adopted for concrete pouring on an overflow surface, a water intake and a local special-shaped part.
5. The construction method for constructing the concrete hyperbolic arch dam by using the excavation material to replace the stock ground according to claim 1, characterized in that: the useful materials include sand, fine stone, medium stone and large stone.
6. The construction method for constructing the concrete hyperbolic arch dam by using the excavation material to replace the stock ground according to claim 3, characterized in that: the concrete construction method comprises the following steps: and conveying the mixture, stirring by adopting a stirrer, conveying to a tower crane, hoisting and warehousing by the tower crane, leveling and vibrating, and finally maintaining.
7. The construction method for constructing the concrete hyperbolic arch dam by using the excavation material to replace the stock ground according to claim 6, characterized in that: before the leveling and vibrating, a layer of cement mortar with the same grade is paved on the foundation surface according to the pouring strength, wherein the thickness of the cement mortar is 2-3 mm, and the cooling water pipe is covered when the mortar is paved.
8. The construction method for constructing the concrete hyperbolic arch dam by using the excavation material to replace the stock ground according to claim 6, characterized in that: the vibration adopts a layered pouring construction mode, and a high-frequency vibrator vibrates.
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