CN102777027B - A kind of mutual buckle type can assembled anti-cracking and seepage control permanent beam template - Google Patents
A kind of mutual buckle type can assembled anti-cracking and seepage control permanent beam template Download PDFInfo
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Abstract
The invention discloses a kind of mutual buckle type can assembled anti-cracking and seepage control permanent beam template.First corner panel and the second corner panel are by fasten and cementing agent is connected.The present invention uses as beam forms in industry and Civil structure, hydro-structure and port sea structure isostructural beam stage of building, build shaping rear double do this structure protected apron and external protection bear a part of load.Beam forms provided by the present invention can make of following several different kinds material, superhigh tenacity cement-base composite material (UHTCC), non metal fiber woven net flock combined reinforced concrete base composite material, gauze wire cloth flock combined reinforced concrete base composite material etc., have simple for production, easy to use, durability is high, the feature that control critical eigenvalue is carried out.
Description
Technical field
The invention belongs to a kind of construction formwork; specifically a kind of high-durability permanent formwork being mainly used in industry and Civil structure, hydro-structure and the isostructural beam of port sea structure; use as template in the stage of building; build shaping rear double protected apron and the external protection doing structure, bear the structural load of a part simultaneously.
Background technology
At present, in domestic construction field, industry uses the template such as wooden form, steel form usually with Civil structure, hydro-structure and the port isostructural beam of sea structure, there is the unfavorable factors such as consumption is large, dismounting is inconvenient, have enough to meet the need costly, utilization rate is low.Endurance issues is one of subject matter of facing of reinforced concrete structure all the time.In structure under conventional situation, ordinary concrete surface is naturally exposed, and durability is lower, and the house of current China nearly 50% enters the ageing step, and namely the building of 23.4 hundred million square metres faces endurance issues.In addition, to carry out using cracking resistance as controlled condition designing be hydro-structure, sea, port structure etc. is different from the key character of other types building structure, the normal work that ordinary concrete problem easy to crack not only can affect hydro-structure etc. also can affect its durability and application life, the serious safe operation that even can affect structure.Some is industry and more scabrous problem in Civil structure, hydro-structure and the construction such as structure of sea, port and use procedure all the time above.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of mutual buckle type can assembled anti-cracking and seepage control permanent beam template, to improve the unfavorable factor that conventional template is brought, improve structure durability simultaneously, reduce structure later maintenance cost and the application life of final extending structure, for this reason, the present invention is by the following technical solutions:
It is made up of the first corner panel and the second corner panel; First corner panel is formed main body with the first perpendicular panel and the second panel, the side of the corresponding beam of the first panel, at the bottom of the corresponding beam of the second panel, the second corner panel is formed main body with the 3rd perpendicular panel and fourth face plate, the side of the corresponding beam of the 3rd panel, at the bottom of the corresponding beam of fourth face plate; This side that described first corner panel is at the bottom of beam has the first connecting portion, and this side that described second corner panel is at the bottom of beam has the second connecting portion, and the first connecting portion and the second connecting portion grafting coordinate; Described first corner panel and the second corner panel select following different materials to make: superhigh tenacity cement-base composite material UHTCC, non metal fiber woven net and flock combined reinforced concrete base composite material, gauze wire cloth and flock combined reinforced concrete base composite material.
On the basis adopting technique scheme, the present invention also can adopt following further technical scheme:
Superhigh tenacity cement-base composite material UHTCC used, its composition comprises cement, active mineral admixture, aggregate, fiber and water, it is characterized in that, active mineral admixture adopts the combination of flyash or flyash and one or more materials following: silicon ash, granulated blast-furnace slag, metakaolin; The maximum particle diameter of aggregate is no more than 0.5mm, fiber is one or more the combination in vinal, polyethylene fibre, aromatic polyamide fibre, fibre length is 5 ~ 25mm, diameter is 0.015 ~ 0.055 mm, modulus of elasticity is 30 ~ 150GPa, tensile strength is 1000 ~ 3500MPa, ultimate elongation is 2% ~ 15%, and the weight ratio of cement and each component of active mineral admixture is:
Cement 12% ~ 55%
Flyash 45% ~ 85%
Silicon ash 0 ~ 15%
Granulated blast-furnace slag 0 ~ 10%
Metakaolin 0 ~ 20%
Above cement and each components by weight sum of active mineral admixture meet 100%;
The weight of aggregate is 1% ~ 70% with the ratio of cement and active mineral admixture gross weight, and the weight of water is 18% ~ 58% with the ratio of cement and active mineral admixture gross weight, and the volume of fiber is 1.5% ~ 2.5% of cement-base composite material cumulative volume.
When described superhigh tenacity cement based composite wood uses vinal, polyethylene fiber peacekeeping aromatic polyamide fibre three kinds of fibers strengthen simultaneously, its proportioning is:
Cement and each components by weight of active mineral admixture are: cement 25%, flyash 60%, silicon ash 2%, granulated blast-furnace slag 8%, metakaolin 5%;
The maximum particle diameter of aggregate is 0.5mm, and the ratio that aggregate weigh and cement add active mineral admixture gross weight is 40%, and the ratio that weight and the cement of water add active mineral admixture gross weight is 25% ~ 45%; The volume of fiber is 1.8% ~ 2.3% of cement-base composite material cumulative volume;
The polyethylene fibre length adopted is 12mm, and diameter is 0.039mm, and tensile strength is 1620MPa, and modulus of elasticity is 42.8GPa, and ultimate elongation is 6%, and volume is 1.2% ~ 1.5% of cement-base composite material cumulative volume; Polyethylene fibre length is 12.7mm, and diameter is 0.038mm, and tensile strength is 2700MPa, and modulus of elasticity is 120GPa, and ultimate elongation is 3.5%, and volume is 0.4% ~ 0.9% of cement-base composite material cumulative volume; Aromatic polyamide fibre length is 15mm, and diameter is 0.015mm, and tensile strength is 2800MPa, and modulus of elasticity is 132GPa, ultimate elongation 2.4%, and volume is 0.2% ~ 0.4% of cement-base composite material cumulative volume.
When described superhigh tenacity cement-base composite material uses vinal and aromatic polyamide fibre two kinds of fibers to strengthen simultaneously, its proportioning is:
Cement and each components by weight of active mineral admixture are: cement 30%, flyash 52%, granulated blast-furnace slag 3%, metakaolin 15%;
The maximum particle diameter of aggregate is 0.5mm, and the ratio that aggregate weigh and cement add active mineral admixture gross weight is 65%, and the ratio that weight and the cement of water add active mineral admixture gross weight is 20% ~ 55%; The volume of fiber is 1.8% ~ 2.2% of cement-base composite material cumulative volume;
The vinal length adopted is 12mm, and diameter is 0.039mm, and tensile strength is 1620MPa, and modulus of elasticity is 42.8GPa, and ultimate elongation is 6%, and volume is 1.6% ~ 2.0% of cement-base composite material cumulative volume; Aromatic polyamide fibre length is 15mm, and diameter is 0.015mm, and tensile strength is 2800MPa, and modulus of elasticity is 132GPa, ultimate elongation 2.4%, and volume is 0.2% ~ 0.4% of cement-base composite material cumulative volume.
When described superhigh tenacity cement-base composite material uses vinal and polyethylene fibre two kinds of fibers to strengthen simultaneously, its proportioning is:
Cement and each components by weight of active mineral admixture are: cement 55%, flyash 45%; The model of cement is P.II 52.5 R;
The maximum particle diameter of aggregate is 0.5mm, and the ratio that weight and the cement of aggregate add active mineral admixture gross weight is 50%, and the ratio that weight and the cement of water add active mineral admixture gross weight is 40% ~ 55%; The volume of fiber is 1.8% ~ 2.2% of cement-base composite material cumulative volume;
The vinal length adopted is 12mm, and diameter is 0.039mm, tensile strength is 1620MPa, modulus of elasticity is 42.8GPa, ultimate elongation is 6%, and volume is 1.2% ~ 1.9% of fibrous concrete cumulative volume; Polyethylene fibre length is 12.7mm, and diameter is 0.038mm, and tensile strength is 2700MPa, and modulus of elasticity is 120GPa, and ultimate elongation is 3.5%, and volume is 0.3% ~ 0.8%. of cement-base composite material cumulative volume
Described non metal fiber woven net and flock combined reinforced concrete base composite material are made up of non metal fiber woven net, nonmetal short fiber and cement based matrix, and described non metal fiber woven net comprises: Carbon Fibre Textile, aramid fiber mesh grid, alkali-resistant glass fibre mesh grid, vinal mesh grid, polyethylene fibre mesh grid or the assorted fibre mesh grid of being made up of above fiber shuffling; Nonmetal short fiber comprises: one or more in vinal, polyethylene fibre, carbon fiber, aramid fiber; The constituent of cement based matrix is except mixing water, also comprise: in portland cement, high alumina cement, sulphate aluminium cement one or more, active mineral fine mineral admixture, water reducing agent, meticulous sand, described active mineral fine mineral admixture is the material with pozzolanic activity.
The material of pozzolanic activity comprises one or more in flyash, silica flour, granulated blast-furnace slag, and the maximum particle diameter of meticulous sand is less than 0.6mm.
In non metal fiber woven net and flock combined reinforced concrete base composite material, the percent by volume of nonmetal short fiber this total composite volume relative is 1.5 ~ 2.5%.
Described first corner panel and the second corner panel inner surface are distributed with some grooves; One of them of first connecting portion and the second connecting portion is sidewall inside beam forms or protruding outside, and wherein another of the first connecting portion and the second connecting portion is the rightabout link slot of projected direction of opening and sidewall.
Described column template is connected and composed by polylith first corner panel and polylith second corner panel, and the panel transverse joint in described beam forms staggers mutually; Also adhesive bond is passed through between the first adjacent corner panel 1 and the second corner panel 2, between adjacent first corner panel 1, between adjacent second corner panel 2.
The present invention can need to adjust according to using the template that the quantity of the first corner panel and the second corner panel and size are combined to form required size and shape, thus forms complete template system.The size of beam forms can meet the needs of difformity size according to actual needs by the size adjusting the first corner panel and the second corner panel, adjust the first corner panel and the second corner panel quantity to meet the needs of differing heights, span size.
Owing to adopting technical scheme of the present invention; the present invention used as template in the stage of building; build shaping after, do not need to remove, and double protected apron and the external protection doing structure; become permanent formwork; itself cost is low and also eliminate demolition cost and turnover expense, reduces engineering cost, can improve and solve the problems such as dismounting in the template constructions such as industry and the extra large structure in Civil structure, hydro-structure and port and utilization rate; reduce construction intensity, greatly can shorten the engineering time.Meanwhile, because this template is made up of superhigh tenacity cement-base composite material, non metal fiber woven net and flock combined reinforced concrete base composite material or gauze wire cloth and flock combined reinforced concrete base composite material, the feature such as there is high stretching ductility and Crack Control ability, damage tolerance is high, energy absorption capability is strong, effectively can reduce the harmful cracks of body structure surface generation and suppress crack progressing, its chloride-penetration resistance and water resistant permeance property are much better than ordinary concrete, can significantly improve durability and the application life of concrete structure.Meanwhile, adopt the structure of corner panel of the present invention, template is by the assembled assembling of corner panel, and have and make simply, assemble easy to use, durability is high, the feature that control critical eigenvalue is carried out.Beam forms of the present invention can also be born part-structure load and reduce the inner amount of reinforcement of beam, and improves the shear strength of beam.
Accompanying drawing explanation
Fig. 1 (a) is the permanent beam template structural representation that corner panel of the present invention is connected into.
Fig. 1 (b) is the permanent beam template top view that corner panel of the present invention is connected into.
Fig. 1 (c) is the permanent beam template lateral view that corner panel of the present invention is connected into.
Fig. 2 (a) is the structural representation of the first corner panel (1) of the present invention.
Fig. 2 (b) is the elevation of the first corner panel (1) of the present invention.
Fig. 2 (c) is the top view of the first corner panel (1) of the present invention.
Fig. 2 (d) is the lateral view of the first corner panel (1) of the present invention.
Fig. 2 (e) is the A-A sectional view of Fig. 2 (c).
Fig. 2 (f) is the B-B sectional view of Fig. 2 (c).
Fig. 3 (a) is the structural representation of the second corner panel (2) of the present invention.
Fig. 3 (b) is the elevation of the second corner panel (2) of the present invention.
Fig. 3 (c) is the top view of the second corner panel (2) of the present invention.
Fig. 3 (d) is the lateral view of the second corner panel (2) of the present invention.
Fig. 3 (e) is the C-C sectional view of Fig. 3 (c).
Fig. 4 is assembling schematic diagram of the present invention.
Detailed description of the invention
Can assembled anti-cracking and seepage control permanent beam template detailed description of the invention be described further mutual buckle type provided by the present invention below in conjunction with accompanying drawing, this embodiment is to explanation of the present invention, instead of makes any restriction to the present invention.
A kind of mutual buckle type of the present embodiment can assembled anti-cracking and seepage control permanent beam template be made up of three piece of first corner panel 1 and three piece of second corner panel 2; First corner panel 1 is formed main body with the first perpendicular panel 13 and the second panel 14, the side of the corresponding beam of the first panel 13, at the bottom of the corresponding beam of second panel 14, second corner panel 2 is formed main body with the 3rd perpendicular panel 23 and fourth face plate 24, the side of the corresponding beam of the 3rd panel 23, at the bottom of the corresponding beam of fourth face plate 24; Described first corner panel 1 this side be at the bottom of beam has the first connecting portion 11, and described second corner panel 2 this side be at the bottom of beam has the second connecting portion 21, first connecting portion 11 and the second connecting portion 21 grafting coordinates; Described first corner panel 1 and the second corner panel 2 select following different materials to make: superhigh tenacity cement-base composite material UHTCC, non metal fiber woven net and flock combined reinforced concrete base composite material, gauze wire cloth and flock combined reinforced concrete base composite material.
Described first corner panel 1 and the second corner panel 2 inner surface are distributed with some grooves 12; Second connecting portion 21 is sidewall inside beam forms or protruding outside, and the first connecting portion 11 is the rightabout link slot of projected direction of opening and sidewall; Also by adhesive bond between the first adjacent corner panel 1 and the second corner panel 2, between adjacent first corner panel 1, between adjacent second corner panel 2, the panel transverse joint in described beam forms staggers mutually.
As shown in Figure 4, the implementation method in above-mentioned situation is below introduced.
1. use superhigh tenacity cement-base composite material to make described first corner panel 1 and the second corner panel 2.Superhigh tenacity cement-base composite material UHTCC used, its composition comprises cement, active mineral admixture, aggregate, fiber and water, and active mineral admixture adopts the combination of flyash or flyash and one or more materials following: silicon ash, granulated blast-furnace slag, metakaolin, the maximum particle diameter of aggregate is no more than 0.5mm, fiber is vinal, polyethylene fibre, one or more combination in aromatic polyamide fibre, fibre length is 5 ~ 25mm, diameter is 0.015 ~ 0.055 mm, modulus of elasticity is 30 ~ 150GPa, tensile strength is 1000 ~ 3500MPa, ultimate elongation is 2% ~ 15%, the weight ratio of cement and each component of active mineral admixture is: cement (12% ~ 55%), flyash (45% ~ 85%), silicon ash (0 ~ 15%), granulated blast-furnace slag (0 ~ 10%), metakaolin (0 ~ 20%), above cement and each components by weight sum of active mineral admixture meet 100%, the weight of aggregate is 1% ~ 70% with the ratio of cement and active mineral admixture gross weight, and the weight of water is 18% ~ 58% with the ratio of cement and active mineral admixture gross weight, and the volume of fiber is 1.5% ~ 2.5% of cement-base composite material cumulative volume.
2. during assembling, the first corner panel 1 and the second corner panel 2 should interlaced arrangement, thus make panel transverse joint in beam forms not on the same line, use cementing agent to bond the cross section of each group of panel, as shown in Figure 4.
During construction, can according to real size need carry out the size of the first corner panel 1 and the second corner panel 2, quantitative design and assembling, by adjust the first panel of the first corner panel 1 and the second corner panel 2, the second panel, the 3rd panel, fourth face plate width can realize the beam forms of different size, adjust the first corner panel 1 and the second corner panel 2 quantity to meet the needs of differing heights, span size, assembling mode is varied.
It is simple that the present invention has making, easy to use, the feature that raising structure durability and control critical eigenvalue are carried out, and easily meets the application of a large amount of engineering.
Claims (7)
1. mutual buckle type can an assembled anti-cracking and seepage control permanent beam template, it is characterized in that: it is made up of the first corner panel (1) and the second corner panel (2); First corner panel (1) is formed main body with the first perpendicular panel and the second panel, the side of the corresponding beam of the first panel, at the bottom of the corresponding beam of second panel, second corner panel (2) is formed main body with the 3rd perpendicular panel and fourth face plate, the side of the corresponding beam of the 3rd panel, at the bottom of the corresponding beam of fourth face plate; This side that described first corner panel is at the bottom of beam has the first connecting portion, and this side that described second corner panel is at the bottom of beam has the second connecting portion, and the first connecting portion and the second connecting portion grafting coordinate; Described first corner panel (1) and the second corner panel (2) select following material to make: superhigh tenacity cement-base composite material UHTCC; Use as template in the stage of building, build shaping after, do not need to remove, and double protected apron and the external protection doing structure; Described beam forms is born part-structure load and is reduced the inner amount of reinforcement of beam, and improves the shear strength of beam.
2. a kind of mutual buckle type according to claim 1 can assembled anti-cracking and seepage control permanent beam template, it is characterized in that: superhigh tenacity cement-base composite material UHTCC used, its composition comprises cement, active mineral admixture, aggregate, fiber and water, it is characterized in that, active mineral admixture adopts the combination of flyash or flyash and one or more materials following: silicon ash, granulated blast-furnace slag, metakaolin; The maximum particle diameter of aggregate is no more than 0.5mm, fiber is one or more the combination in vinal, polyethylene fibre, aromatic polyamide fibre, fibre length is 5 ~ 25mm, diameter is 0.015 ~ 0.055mm, modulus of elasticity is 30 ~ 150GPa, tensile strength is 1000 ~ 3500MPa, ultimate elongation is 2% ~ 15%, and the weight ratio of cement and each component of active mineral admixture is:
Above cement and each components by weight sum of active mineral admixture meet 100%;
The weight of aggregate is 1% ~ 70% with the ratio of cement and active mineral admixture gross weight, and the weight of water is 18% ~ 58% with the ratio of cement and active mineral admixture gross weight, and the volume of fiber is 1.5% ~ 2.5% of cement-base composite material cumulative volume.
3. a kind of mutual buckle type according to claim 2 can assembled anti-cracking and seepage control permanent beam template, it is characterized in that: when described superhigh tenacity cement based composite wood uses vinal, polyethylene fiber peacekeeping aromatic polyamide fibre three kinds of fibers strengthen simultaneously, its proportioning is:
Cement and each components by weight of active mineral admixture are: cement 25%, flyash 60%, silicon ash 2%, granulated blast-furnace slag 8%, metakaolin 5%;
The maximum particle diameter of aggregate is 0.5mm, and the ratio that aggregate weigh and cement add active mineral admixture gross weight is 40%, and the ratio that weight and the cement of water add active mineral admixture gross weight is 25% ~ 45%; The volume of fiber is 1.8% ~ 2.3% of cement-base composite material cumulative volume;
The polyethylene fibre length adopted is 12mm, and diameter is 0.039mm, and tensile strength is 1620MPa, and modulus of elasticity is 42.8GPa, and ultimate elongation is 6%, and volume is 1.2% ~ 1.5% of cement-base composite material cumulative volume; Polyethylene fibre length is 12.7mm, and diameter is 0.038mm, and tensile strength is 2700MPa, and modulus of elasticity is 120GPa, and ultimate elongation is 3.5%, and volume is 0.4% ~ 0.9% of cement-base composite material cumulative volume; Aromatic polyamide fibre length is 15mm, and diameter is 0.015mm, and tensile strength is 2800MPa, and modulus of elasticity is 132GPa, ultimate elongation 2.4%, and volume is 0.2% ~ 0.4% of cement-base composite material cumulative volume.
4. a kind of mutual buckle type according to claim 2 can assembled anti-cracking and seepage control permanent beam template, it is characterized in that: when described superhigh tenacity cement-base composite material uses vinal and aromatic polyamide fibre two kinds of fibers to strengthen simultaneously, its proportioning is:
Cement and each components by weight of active mineral admixture are: cement 30%, flyash 52%, granulated blast-furnace slag 3%, metakaolin 15%;
The maximum particle diameter of aggregate is 0.5mm, and the ratio that aggregate weigh and cement add active mineral admixture gross weight is 65%, and the ratio that weight and the cement of water add active mineral admixture gross weight is 20% ~ 55%; The volume of fiber is 1.8% ~ 2.2% of cement-base composite material cumulative volume;
The vinal length adopted is 12mm, and diameter is 0.039mm, and tensile strength is 1620MPa, and modulus of elasticity is 42.8GPa, and ultimate elongation is 6%, and volume is 1.6% ~ 2.0% of cement-base composite material cumulative volume; Aromatic polyamide fibre length is 15mm, and diameter is 0.015mm, and tensile strength is 2800MPa, and modulus of elasticity is 132GPa, ultimate elongation 2.4%, and volume is 0.2% ~ 0.4% of cement-base composite material cumulative volume.
5. a kind of mutual buckle type according to claim 2 can assembled anti-cracking and seepage control permanent beam template, it is characterized in that: when described superhigh tenacity cement-base composite material uses vinal and polyethylene fibre two kinds of fibers to strengthen simultaneously, its proportioning is:
Cement and each components by weight of active mineral admixture are: cement 55%, flyash 45%; The model of cement is P.II 52.5R;
The maximum particle diameter of aggregate is 0.5mm, and the ratio that weight and the cement of aggregate add active mineral admixture gross weight is 50%, and the ratio that weight and the cement of water add active mineral admixture gross weight is 40% ~ 55%; The volume of fiber is 1.8% ~ 2.2% of cement-base composite material cumulative volume;
The vinal length adopted is 12mm, and diameter is 0.039mm, tensile strength is 1620MPa, modulus of elasticity is 42.8GPa, ultimate elongation is 6%, and volume is 1.2% ~ 1.9% of fibrous concrete cumulative volume; Polyethylene fibre length is 12.7mm, and diameter is 0.038mm, and tensile strength is 2700MPa, and modulus of elasticity is 120GPa, and ultimate elongation is 3.5%, and volume is 0.3% ~ 0.8% of cement-base composite material cumulative volume.
6. a kind of mutual buckle type according to claim 1 can assembled anti-cracking and seepage control permanent beam template, it is characterized in that: described first corner panel (1) and the second corner panel (2) inner surface are distributed with some grooves; One of them of first connecting portion and the second connecting portion is sidewall inside beam forms or protruding outside, and wherein another of the first connecting portion and the second connecting portion is the rightabout link slot of projected direction of opening and sidewall.
7. a kind of mutual buckle type according to claim 1 or 6 can assembled anti-cracking and seepage control permanent beam template, it is characterized in that: described beam forms is connected and composed by polylith first corner panel and polylith second corner panel, and the panel transverse joint in described beam forms staggers mutually; Also adhesive bond is passed through between the first adjacent corner panel 1 and the second corner panel 2, between adjacent first corner panel 1, between adjacent second corner panel 2.
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| CN103266760B (en) * | 2013-05-14 | 2015-12-23 | 浙江大学 | A kind of fiber knitted net refinforced cement based composites permanent beam template and preparation method thereof |
| CN103964795B (en) * | 2014-03-04 | 2015-07-22 | 杭州固华新材料科技有限公司 | Reinforced cement based composite material with fiber woven mesh and preparation method of reinforced cement based composite material |
| CN108360811A (en) * | 2018-02-08 | 2018-08-03 | 中国矿业大学 | A kind of TRC pin joints formula can assembled permanent formwork and preparation method thereof |
| CN108590164B (en) * | 2018-05-07 | 2019-10-15 | 中国矿业大学 | A kind of TRC is collapsible can assembled permanent formwork and preparation method thereof |
| CN109811963B (en) * | 2019-01-17 | 2021-07-13 | 南京彼卡斯建筑科技有限公司 | L-shaped open type permanent beam formwork |
| CN110318495B (en) * | 2019-07-10 | 2021-11-12 | 中国矿业大学 | Assembled permanent template superposed FRP rib seawater sea sand recycled concrete beam and manufacturing method thereof |
| CN111423169A (en) * | 2020-04-10 | 2020-07-17 | 哈尔滨工业大学 | High-toughness low-cost environment-friendly composite beam and construction method thereof |
| CN112962863B (en) * | 2021-02-08 | 2022-10-28 | 江西科技学院 | Construction method of semi-prefabricated ring beam and semi-prefabricated ring beam structure |
| CN114351941B (en) * | 2021-12-15 | 2023-09-12 | 中建八局第二建设有限公司 | Mutually-buckled spliced anti-cracking anti-seepage permanent beam template |
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