CN217500106U - Step template suitable for synchronous ascending pouring of roller compacted concrete on overflow surface of dam - Google Patents
Step template suitable for synchronous ascending pouring of roller compacted concrete on overflow surface of dam Download PDFInfo
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- CN217500106U CN217500106U CN202221138412.8U CN202221138412U CN217500106U CN 217500106 U CN217500106 U CN 217500106U CN 202221138412 U CN202221138412 U CN 202221138412U CN 217500106 U CN217500106 U CN 217500106U
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Abstract
The utility model discloses a step template suitable for dam overflow surface roller compacted concrete rises in step and pours, include the step template of compriseing three-layer side slope template at least, every layer of side slope template is constituteed and is set up respectively in the roller compacted concrete layer top surface border of having pour by several prefabricated module concatenations, and the lateral surface and the medial surface of adjacent both sides slope template are in same vertical face. The utility model discloses a set up prefabricated module, solved current template and can not realize rising in succession or erect the required manual work of template, the too many problem of supporting material during rising in succession, gain better effect in aspects such as social and economic benefits.
Description
Technical Field
The utility model relates to a civil engineering technical field specifically is the step template that is applicable to dam overflow surface roller compacted concrete synchronous rising and pours.
Background
In general, normal concrete is arranged on the surface layer of the downstream overflow surface of a roller compacted concrete dam, the strength of the normal concrete is not lower than 30Mpa, and due to the characteristics of the normal concrete, the normal concrete is difficult to pour and rise simultaneously with the roller compacted concrete in the construction process, so the prior art usually forms a reserved step structure and embeds inserted bars during roller compacted concrete construction, and then performs normal concrete construction, a matched template is required to be adopted for the construction mode of the reserved step of the roller compacted concrete, the template in the prior art is shown in figure 1, a 3015 steel template 5 + 1015 steel template 6 is adopted to make a combined template, the template 5 and the template 6 are connected by fasteners, steel pipe purlins are adopted in the horizontal and vertical directions, and the processed conventional template is difficult to ensure the stability of the template due to the weight problem because the roller compacted concrete rises continuously, the necessary support 7 needs to be provided. Meanwhile, through holes for inserting the steel bars to pass through are reserved in the template 5.
The common steel templates are combined for processing the template, the weight of the template cannot meet the stability requirement, the number of supports used for erecting and reinforcing the template is large, the rolling construction interference is caused, and the supports are used as disposable materials buried in concrete, so that the construction cost is greatly increased. Near the roller compacted concrete of template can't directly pave to the template edge simultaneously, only utilizes the manual work to carry out roller compacted concrete and pave, and the degree of compaction hardly reaches the design requirement, because the existence of pre-buried dowel, later stage form removal complex operation moreover.
SUMMERY OF THE UTILITY MODEL
The not enough to prior art, the utility model discloses the problem that will solve just provides a step template suitable for dam overflow face roller compacted concrete rises in step and pours, the utility model discloses a step template is assembled, is dismantled conveniently, and rigidity, intensity, stability can satisfy roller compacted concrete's construction requirement moreover, can satisfy the designing requirement of pre-buried dowel simultaneously, reduces later stage dowel drilling volume, practices thrift construction cost.
In order to achieve the above object, the utility model provides a following technical scheme:
the step formwork is suitable for synchronous ascending pouring of the roller compacted concrete on the overflow surface of the dam and comprises at least step formworks consisting of three layers of side slope formworks, each layer of side slope formwork is formed by splicing a plurality of prefabricated modules and is respectively arranged on the top surface edge of a poured roller compacted concrete layer, and the outer side surface and the inner side surface of each two adjacent side slope formworks are positioned on the same vertical surface.
Preferably, the prefabricated module is of a cuboid structure, the height-width ratio of the prefabricated module is not smaller than the slope ratio of the overflow surface of the dam, and the distance between the embedded joint bars in the same horizontal plane is the same as the length of the prefabricated module.
The height of the prefabricated module is designed according to the designed layer number and the layer thickness of the roller compacted concrete and the thickness of an embedded layer for installing the embedded bolts, and the overflow surface slope ratio of the dam is 1:0.75 is taken as an example, namely, every time the height direction is raised by 1m, the width direction is retracted by 0.75m, the layer thickness is 30 cm/layer during the roller compacted concrete construction, and 3 layers are poured; the width of the prefabricated module is 75cm, the height can meet the requirement when being designed to be 100cm, and a 10cm space between the top surface of the roller compacted concrete layer and the top surface of the prefabricated module is used for laying a pre-buried layer for installing pre-buried joint bars. Because the pre-buried dowel bars are arranged in a quincunx shape of 100cm x 100cm, the length of the prefabricated module is 100cm, so that after the first layer of side slope template is poured, the dowel bars are arranged on the pouring top surface and the parallel and level surface formed by the template top surface, then the second layer of side slope template can be installed, pouring and installing the pre-buried dowel bars are carried out, and finally three adjacent pre-buried dowel bars form quincunx distribution. The three layers of side slope templates are alternately used, namely after the third layer of side slope templates are poured, the first layer of side slope templates can be detached and installed as a fourth layer of side slope templates.
Preferably, the prefabricated module is a plain concrete prefabricated member and the bottom surface of the prefabricated module is integrally provided with a film layer.
Because the prefabricated module is pressed on corresponding roller compacted concrete and the buried layer top surface in advance, the setting of thin layer can prevent the bonding of prefabricated module and concreting, makes things convenient for later stage to dismantle.
Preferably, two lifting lugs are pre-embedded in the top surface of the prefabricated module, and the distance between the two lifting lugs is half the length of the prefabricated module.
Due to the arrangement of the lifting lugs, the crane and the prefabricated module can be conveniently transferred, spliced and detached.
Preferably, the width direction of the width side edge of the top surface of the prefabricated module and the width direction of the length midpoint are integrally formed to be provided with an inwards concave cambered surface, and the inwards concave cambered surface is used for being matched with and installing an embedded joint bar. Through the setting of indent cambered surface, the gap between the prefabricated module of reduction that can the biggest effect improves the bulk strength of avris template as far as possible.
The utility model discloses possess following beneficial effect:
1) the utility model discloses a set up a plurality of prefabricated modules and constitute corresponding side slope template and step template, utilize dead weight and cooperation between the prefabricated module can form the stable stay, need not extra supporting, not only reduced construction cost, the side slope template structure that the prefabricated module formed is stable simultaneously, is convenient for the roller compacted concrete roller compacted construction and the compactness satisfies the design requirement;
2) the prefabricated module realizes transportation, installation, dismantlement and turnover recycling through pre-buried lug, can accomplish roller compacted concrete in succession, fast and reserve the step construction, has improved roller compacted concrete's efficiency of construction.
Drawings
FIG. 1 is a prior art conventional form support diagram of the present invention;
FIG. 2 is a schematic structural view of a prefabricated module erecting step form of the present invention;
fig. 3 is a schematic diagram of the structure of the prefabricated module of the present invention.
In the figure: 1. prefabricating a module; 2. lifting lugs; 3. a thin film layer; 4. inserting ribs; 5. 3015 forming a steel template; 6. 1015 a steel template; 7. supporting; 8. an inner concave cambered surface; 9. rolling a concrete layer, 10 and a pre-buried layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
As shown in fig. 2-3, the step template suitable for synchronous rising pouring of the roller compacted concrete on the overflow surface of the dam is characterized in that: the construction method comprises a step formwork which is composed of at least three layers of side slope formworks, wherein each layer of side slope formwork is formed by splicing a plurality of prefabricated modules 1 and is respectively arranged on the top surface edge of a poured roller compacted concrete layer, and the outer side surface and the inner side surface of each two adjacent side slope formworks are positioned on the same vertical surface.
The prefabricated module 1 is of a cuboid structure, the height and width ratio of the prefabricated module 1 is not smaller than the slope ratio of an overflow surface of a dam, and the distance between embedded joint bars in the same horizontal plane is the same as the length of the prefabricated module 1. Two lifting lugs 2 are pre-embedded in the top surface of the prefabricated module 1, and the distance between the two lifting lugs 2 is half the length of the prefabricated module 1. The width direction homogeneous body shaping of the width side of prefabricated module 1 top surface and length midpoint department has indent cambered surface 8, and indent cambered surface 8 is used for the pre-buried dowel steel 4 of cooperation installation. The prefabricated module 1 is a plain concrete prefabricated member and is integrally provided with a film layer 3 on the bottom surface.
The scheme recorded in the embodiment is secretly implemented in the construction of reserved steps of the roller compacted concrete overflow surface of the dam of the Zaizaya XX hydropower station project. Designing a slope ratio of 1:0.75, wherein the thickness of the roller compacted concrete layer 9 is 30 cm/layer, pouring three layers together, and simultaneously pouring a pre-buried layer 10 with the thickness of 10cm above the roller compacted concrete layer 9; the inserting ribs 4 arranged on each layer of pre-buried layer are arranged in a quincunx shape with the row spacing of 1.0m multiplied by 1.0 m.
The parameters for designing the prefabricated module 1 are as follows: the width is 75cm, high design 100cm, length 100cm, according to concrete bulk density for 2.4t/m, can know that monolithic prefabrication module 1's weight is 2.4 x 1 x 0.75=1.8t, and stability satisfies the design requirement completely, prefabrication module 1 concrete label is C20, and intensity is 20Mpa, and rigidity, intensity also can satisfy the requirement, and lug 2 is the round steel of diameter 20mm, and lug 2 interval is 0.5 m.
Before construction:
(1) firstly, designing a prefabricated step template drawing according to an overflow surface slope ratio and a construction drawing, and processing a step template according to the prefabricated step template drawing;
(2) adopting an assembled step template drawing to carry out on-site prefabricated part manufacturing, assembling the machined and formed prefabricated module 1 on site, and carrying out first piece approval;
(3) according to the poured first prefabricated module 1, checking the problems of the prefabricated part in the construction process, and optimizing the prefabricated module 1;
(4) manufacturing the prefabricated module 1 again to ensure the quality of the prefabricated module 1, and performing batch production after the prefabricated module 1 is qualified, wherein the prefabricated module 1 can be completely completed before the construction of reserving steps on an overflow surface; two lifting lugs 2 are arranged at the top of the prefabricated module 1;
(5) before the steps reserved on the overflow surface begin to be constructed, the prefabricated modules 1 are firstly transported to a construction site, and the engineering quantity of the prefabricated modules 1 is not increased along with the rise of the dam body according to the drawing, so that a certain loss quantity needs to be considered during the manufacturing of the prefabricated modules 1;
during construction:
(1) before the construction of reserving step concrete on the reserved surface of the dam, completing a first layer of side slope formwork erected by the prefabricated modules 1;
(2) paving three layers of the roller compacted concrete layer 9, paving 10cm of roller compacted concrete to form a pre-buried layer 10 after all the layers are compacted by rolling, and compacting by adopting small-sized vibration;
(3) arranging the dowel bars 4 on the level top surfaces of the embedded layer 10 and the first layer of side slope template according to the arrangement requirements of the dowel bars 4 in the drawing, and enabling the dowel bars 4 to be matched with the concave cambered surfaces 8 of the corresponding prefabricated modules 1;
(4) laying a second layer of side slope formwork above the embedded layer 10, and installing the prefabricated module 1 by adopting an 8t truck crane in cooperation with manual work;
(5) the steps (2) and (4) are circulated until the erection of the third layer of side slope template is completed;
(6) before erecting a fourth layer of step templates, a first layer of step templates at the bottommost part need to be dismantled and transported to an operation surface for erecting the fourth layer of step templates, 8t truck cranes are matched with manpower for dismantling, the dismantled step templates are directly erected on the fourth layer, a second layer of step templates at the bottom are adopted for erecting the fifth layer of step templates, and a third layer of step templates at the bottom are adopted for erecting the sixth layer of step templates;
(11) and sequentially and circularly repeating the steps until the pouring of the roller compacted concrete is finished.
In conclusion, multiple field tests show that the prefabricated step template can completely meet the requirements, the rapid and continuous rising of the roller compacted concrete reserved step can be met from the aspects of rigidity, strength, stability, installation, dismounting and the like of the step template, the construction speed can be accelerated, and the construction period and the construction cost are saved.
Claims (5)
1. The step template suitable for synchronous rising pouring of dam overflow surface roller compacted concrete is characterized in that: the construction method comprises step formworks which are at least composed of three layers of side slope formworks, wherein each layer of side slope formwork is formed by splicing a plurality of prefabricated modules (1) and is respectively arranged on the top surface edge of a poured roller compacted concrete layer, and the outer side surface and the inner side surface of each two adjacent side slope formworks are positioned on the same vertical surface.
2. The step formwork applicable to synchronous ascending pouring of the roller compacted concrete of the overflow surface of the dam according to claim 1, is characterized in that: the prefabricated module (1) is of a cuboid structure, the height and width ratio of the prefabricated module (1) is not smaller than the slope ratio of the overflow surface of the dam, and the distance between the embedded joint bars in the same horizontal plane is the same as the length of the prefabricated module (1).
3. The step formwork applicable to synchronous ascending pouring of the roller compacted concrete of the overflow surface of the dam according to claim 2, is characterized in that: the prefabricated module (1) is a plain concrete prefabricated part and is integrally provided with a film layer on the bottom surface.
4. The step formwork applicable to synchronous ascending pouring of the roller compacted concrete of the overflow surface of the dam according to claim 2, is characterized in that: two lifting lugs (2) are pre-embedded in the top surface of the prefabricated module (1), and the distance between the two lifting lugs (2) is half the length of the prefabricated module (1).
5. The step formwork applicable to synchronous ascending pouring of the roller compacted concrete of the overflow surface of the dam according to claim 2, is characterized in that: the width direction homogeneous body shaping of width side and length midpoint department of prefabricated module (1) top surface has the indent cambered surface, and the indent cambered surface is used for the pre-buried dowel bar of cooperation installation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221138412.8U CN217500106U (en) | 2022-05-13 | 2022-05-13 | Step template suitable for synchronous ascending pouring of roller compacted concrete on overflow surface of dam |
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| CN202221138412.8U CN217500106U (en) | 2022-05-13 | 2022-05-13 | Step template suitable for synchronous ascending pouring of roller compacted concrete on overflow surface of dam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116219967A (en) * | 2023-04-24 | 2023-06-06 | 中国水利水电第三工程局有限公司 | Construction method of downstream dam face step structure of roller compacted concrete dam |
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2022
- 2022-05-13 CN CN202221138412.8U patent/CN217500106U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116219967A (en) * | 2023-04-24 | 2023-06-06 | 中国水利水电第三工程局有限公司 | Construction method of downstream dam face step structure of roller compacted concrete dam |
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