CN104612133A - Concrete precast pile with mixed reinforcement of glass fiber-reinforced polymers and steel bars - Google Patents
Concrete precast pile with mixed reinforcement of glass fiber-reinforced polymers and steel bars Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 230000002787 reinforcement Effects 0.000 title claims abstract description 45
- 239000004567 concrete Substances 0.000 title claims abstract description 26
- 239000011521 glass Substances 0.000 title description 2
- 229920002430 Fibre-reinforced plastic Polymers 0.000 title 1
- 239000011151 fibre-reinforced plastic Substances 0.000 title 1
- 239000003365 glass fiber Substances 0.000 claims abstract description 70
- 239000003351 stiffener Substances 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims 3
- 238000005452 bending Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 7
- 210000002435 tendon Anatomy 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011152 fibreglass Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011513 prestressed concrete Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
本发明属于混凝土预制桩技术领域，特别涉及一种玻璃纤维筋与钢筋混合配筋的混凝土预制桩。本发明中的混凝土预制桩包括两端均设置有锚固板的桩体，所述桩体内部设有钢筋骨架笼，所述钢筋骨架笼包括预应力钢筋、玻璃纤维筋和螺旋箍筋，所述预应力钢筋和玻璃纤维筋共同排布在以桩体中心线为轴线的同一个圆柱面上；所述预应力钢筋的两端分别与设置在桩体两端的锚固板固定联接，所述预应力钢筋与螺旋箍筋焊接连接在一起，所述玻璃纤维筋与螺旋箍筋绑扎连接在一起。本发明中的混凝土预制桩不仅具有高抗弯性能、耐久性好、抗震性能好等优点，而且能够较好地适用于对水平荷载要求高的区域；同时，本发明造价低、节省钢材、施工和运输方便。
The invention belongs to the technical field of concrete prefabricated piles, in particular to a concrete prefabricated pile with mixed reinforcement of glass fiber bars and steel bars. The concrete prefabricated pile in the present invention comprises a pile body provided with anchor plates at both ends, and a steel skeleton cage is arranged inside the pile body, and the steel skeleton cage includes prestressed steel bars, glass fiber bars and spiral stirrups. The prestressed steel bars and glass fiber bars are arranged on the same cylindrical surface with the center line of the pile body as the axis; The steel bars are welded together with the spiral stirrups, and the glass fiber bars are tied together with the spiral stirrups. The concrete prefabricated pile in the present invention not only has the advantages of high bending resistance, good durability, and good seismic performance, but also can be better applied to areas with high requirements for horizontal load; and convenient transportation.
Description
技术领域technical field
本发明属于混凝土预制桩技术领域，特别涉及一种玻璃纤维筋与钢筋混合配筋的混凝土预制桩。The invention belongs to the technical field of concrete prefabricated piles, in particular to a concrete prefabricated pile with mixed reinforcement of glass fiber bars and steel bars.
背景技术Background technique
混凝土预制桩，是指采用先预应力和离心成型法制成的一种细长混凝土预制构件。为提高预制桩的性能，该类桩中可以设置由钢筋主筋和螺旋箍筋构成的钢筋骨架。混凝土预制桩具有工业规模化生产、质量易于保障、单桩承载力高、对工程地址条件适应性强、施工速度快、现场无污染等优点。但是混凝土预制桩存在着桩身抗弯性能较差问题和钢筋混凝土结构的耐久性问题，这些缺陷严重限制了预应力混凝土管桩作为水平支护桩在工程中的大规模应用。Concrete prefabricated pile refers to a slender concrete prefabricated component made by prestressing and centrifugal forming method. In order to improve the performance of prefabricated piles, a steel skeleton composed of steel main reinforcement and spiral stirrup can be set in this type of pile. Concrete prefabricated piles have the advantages of industrial scale production, easy quality assurance, high single pile bearing capacity, strong adaptability to project site conditions, fast construction speed, and no pollution on site. But concrete prefabricated piles have problems of poor bending resistance of the pile body and durability of reinforced concrete structures. These defects seriously limit the large-scale application of prestressed concrete pipe piles as horizontal support piles in engineering.
发明内容Contents of the invention
本发明的目的是为了克服现有技术中的不足，提供一种高抗弯性能、耐久性好、抗震性能好的混凝土预制桩，本发明中的混凝土预制桩能够较好地适用于对水平荷载要求高的区域，即本发明中的混凝土预制桩能够作为水平支护桩使用；同时，本发明造价低、节省钢材、施工和运输方便。The purpose of the present invention is to overcome the deficiencies in the prior art and provide a kind of concrete prefabricated pile with high bending resistance, good durability and good seismic performance. Areas with high requirements, that is, the concrete prefabricated piles in the present invention can be used as horizontal support piles; meanwhile, the present invention has low cost, saves steel materials, and is convenient for construction and transportation.
为实现上述发明目的，本发明采用了如下技术方案：In order to realize the above-mentioned purpose of the invention, the present invention has adopted following technical scheme:
一种玻璃纤维筋与钢筋混合配筋的混凝土预制桩，包括两端均设置有锚固板的桩体，所述桩体内部设有钢筋骨架笼，所述钢筋骨架笼包括预应力钢筋、玻璃纤维筋和螺旋箍筋，所述预应力钢筋和玻璃纤维筋共同排布在以桩体中心线为轴线的同一个圆柱面上；所述预应力钢筋的两端分别与设置在桩体两端的锚固板固定联接，所述预应力钢筋与螺旋箍筋焊接连接在一起，所述玻璃纤维筋与螺旋箍筋绑扎连接在一起。A concrete prefabricated pile with mixed reinforcement of glass fiber bars and steel bars, comprising a pile body with anchor plates at both ends, a steel skeleton cage is arranged inside the pile body, and the steel skeleton cage includes prestressed steel bars, glass fiber tendons and spiral stirrups, the prestressed steel bars and glass fiber bars are arranged on the same cylindrical surface with the centerline of the pile body as the axis; The plates are fixedly connected, the prestressed steel bars are welded together with the spiral stirrups, and the glass fiber bars are bound together with the spiral stirrups.
优选的，所述玻璃纤维筋的数量等于或少于预应力钢筋的数量；当玻璃纤维筋的数量等于预应力钢筋的数量时，玻璃纤维筋和预应力钢筋沿圆周方向间隔交错排列；当玻璃纤维筋的数量少于预应力钢筋的数量时，玻璃纤维筋分散在预应力钢筋之间。Preferably, the number of glass fiber bars is equal to or less than the number of prestressed steel bars; when the number of glass fiber bars is equal to the number of prestressed steel bars, the glass fiber bars and prestressed steel bars are alternately arranged along the circumferential direction; when the glass When the number of fiber bars is less than the number of prestressed steel bars, the glass fiber bars are scattered among the prestressed steel bars.
优选的，所述玻璃纤维筋为非预应力筋。Preferably, the glass fiber tendons are non-prestressed tendons.
优选的，所述预应力钢筋与玻璃纤维筋之间的数量比值为1.4～1.6。Preferably, the quantity ratio between the prestressed steel bars and the glass fiber bars is 1.4-1.6.
进一步的，所述钢筋骨架笼还包括设置在预应力钢筋和玻璃纤维筋内侧的焊接加劲箍，所述预应力钢筋与焊接加劲箍焊接连接在一起，所述玻璃纤维筋与焊接加劲箍绑扎连接在一起。Further, the steel bar skeleton cage also includes welded stiffening hoops arranged inside the prestressed steel bars and glass fiber bars, the prestressed steel bars are welded and connected to the welded stiffeners, and the glass fiber bars are bound and connected to the welded stiffeners together.
优选的，所述钢筋骨架笼还设置有绑扎段钢筋，所述绑扎段钢筋与玻璃纤维筋平行排布，且绑扎段钢筋与玻璃纤维筋通过扎丝绑扎在一起，所述绑扎段钢筋与螺旋箍筋或焊接加劲箍焊接连接在一起。Preferably, the steel bar skeleton cage is also provided with a binding section of steel bars, the binding section of steel bars and glass fiber bars are arranged in parallel, and the binding section of steel bars and glass fiber bars are bound together by wire binding, and the binding section of steel bars and the spiral Stirrups or welded stiffeners are welded together.
进一步的，所述钢筋骨架笼还包括构造筋，所述构造筋与玻璃纤维筋或预应力钢筋绑扎连接在一起。Further, the steel bar skeleton cage also includes structural bars, and the structural bars are tied together with glass fiber bars or prestressed steel bars.
与已有技术相比，本发明的有益效果体现在：Compared with the prior art, the beneficial effects of the present invention are reflected in:
1)、本发明在钢筋骨架笼中增设了与钢筋主筋交错设置的玻璃纤维筋。所述玻璃纤维筋的材质为玻璃纤维增强塑料(GFRP)，玻璃纤维增强塑料是一种由树脂和玻璃纤维复合组成的新型材料，它相对于普通钢筋具有防腐性、抗拉强度高、抗冲击性能好、便于切割及重量轻等显著优点。1), the present invention has set up the glass fiber reinforcement interlaced with the reinforcement main reinforcement in the steel reinforcement cage. The material of the glass fiber reinforcement is glass fiber reinforced plastic (GFRP). Glass fiber reinforced plastic is a new type of material composed of resin and glass fiber. Compared with ordinary steel bars, it has corrosion resistance, high tensile strength, and impact resistance. It has obvious advantages such as good performance, easy cutting and light weight.
本发明中采用了预应力筋钢筋和玻璃纤维筋的混合配筋设计方式，其中预应力筋钢筋主要承受竖向荷载，而玻璃纤维筋为非预应力筋，主要承受水平荷载，从而本发明中的预应力钢筋和玻璃纤维筋互相配合，使得混凝土预制桩既具有预应力混凝土支护桩的高竖向承载力、耐击打的优点，同时又具有玻璃纤维筋自身抗拉强度高、抗腐蚀性好、抗震能力强及重量轻等优点，因此本发明中的混凝土预制桩能够显著改善预应力混凝土预制桩的水平承载力、抗弯承载力及耐久性等特性，甚至可以满足较高抗震设防烈度地区对桩基的性能要求。In the present invention, the mixed reinforcement design method of prestressed steel bars and glass fiber bars is adopted, wherein the prestressed steel bars mainly bear vertical loads, and the glass fiber bars are non-prestressed bars, which mainly bear horizontal loads, so in the present invention The prestressed steel bars and glass fiber bars cooperate with each other, so that the concrete prefabricated piles not only have the advantages of high vertical bearing capacity and impact resistance of prestressed concrete support piles, but also have the high tensile strength and corrosion resistance of glass fiber bars. Therefore, the concrete prefabricated pile in the present invention can significantly improve the horizontal bearing capacity, flexural bearing capacity and durability of the prestressed concrete prefabricated pile, and can even meet the requirements of higher seismic fortification. Performance requirements for pile foundations in intensity areas.
2)、本发明应用范围广，桩身混凝土强度高，抗压承载力高；混合配筋设计，极大地提高了桩身抗弯性能；本发明可应用于工业和民用建筑、地铁站台的深基坑支护，也可在公路、铁路及桥梁等基础设施的边坡维护及桥墩基础施工等领域广泛应用。由于玻璃纤维筋的抗腐蚀性能好，本发明所述的支护桩还可在港口基础施工、跨海大桥基础施工等领域广泛应用。2), the present invention has a wide application range, high concrete strength of the pile body, and high compressive bearing capacity; the mixed reinforcement design greatly improves the bending resistance of the pile body; the present invention can be applied to industrial and civil buildings, and deep Foundation pit support can also be widely used in the fields of slope maintenance of infrastructure such as roads, railways and bridges, and bridge pier foundation construction. Due to the good corrosion resistance of the glass fiber reinforcement, the supporting piles described in the present invention can also be widely used in fields such as port foundation construction and sea-crossing bridge foundation construction.
3)、本发明采用了玻璃纤维筋与预应力钢筋的结合，从而使得混凝土预制桩的造价降低，还节省了大量钢材。3), the present invention adopts the combination of glass fiber bars and prestressed steel bars, thereby reducing the cost of concrete prefabricated piles and saving a lot of steel materials.
4)、本发明施工、生产和输运较为方便。目前的预制桩施工技术、生产技术和输运技术非常成熟，完全可直接应用至本发明上。4), the construction, production and transportation of the present invention are relatively convenient. The present prefabricated pile construction technology, production technology and transportation technology are very mature and can be directly applied to the present invention.
附图说明Description of drawings
图1为本发明的结构示意图。Fig. 1 is a structural schematic diagram of the present invention.
图2为图1的横截面剖面示意图。FIG. 2 is a schematic cross-sectional view of FIG. 1 .
图3为14根预应力筋和10根玻璃纤维筋的排布结构示意图。Figure 3 is a schematic diagram of the arrangement structure of 14 prestressed tendons and 10 glass fiber tendons.
图4为本发明中的玻璃纤维筋与焊接加劲箍的连接结构示意图。Fig. 4 is a schematic diagram of the connection structure between the glass fiber bars and the welded stiffening hoop in the present invention.
图5为锚固系统示意图。Figure 5 is a schematic diagram of the anchoring system.
图中标注符号的含义如下：The meanings of the marked symbols in the figure are as follows:
10—桩体 11—锚固板 110—锚固系统 111—锚固孔10—pile body 11—anchor plate 110—anchor system 111—anchor hole
112—过筋槽 113—张拉孔 12—桩套箍112—Reinforcement groove 113—Tension hole 12—Pile hoop
20—钢筋骨架笼 21—预应力钢筋 22—玻璃纤维筋20—reinforced skeleton cage 21—prestressed reinforcement 22—glass fiber reinforcement
23—螺旋箍筋 24—焊接加劲箍 25—绑扎段钢筋 26—扎丝23—Spiral stirrup 24—Welded stiffening stirrup 25—Reinforcing bar for binding section 26—Wire binding
具体实施方式Detailed ways
下面将结合本发明中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them.
如图1所示，一种玻璃纤维筋与钢筋混合配筋的混凝土预制桩，包括两端均设置有锚固板11的桩体10，所述桩体10内部设有钢筋骨架笼20，所述钢筋骨架笼20包括预应力钢筋21、玻璃纤维筋22和螺旋箍筋23，所述预应力钢筋21和玻璃纤维筋22彼此平行设置，且二者共同排布在以桩体中心线为轴线的同一个圆柱面上；所述预应力钢筋21的长度大于玻璃纤维筋22的长度，预应力钢筋21的两端分别与设置在桩体10两端的锚固板11固定联接，所述预应力钢筋21与螺旋箍筋23焊接连接在一起，所述玻璃纤维筋22与螺旋箍筋23绑扎连接在一起；所述玻璃纤维筋22为非预应力筋。As shown in Figure 1, a concrete prefabricated pile with mixed reinforcement of glass fiber bars and steel bars includes a pile body 10 with anchor plates 11 arranged at both ends, and a steel skeleton cage 20 is arranged inside the pile body 10, and the The reinforced skeleton cage 20 includes prestressed steel bars 21, glass fiber bars 22 and spiral stirrups 23. The prestressed steel bars 21 and glass fiber bars 22 are arranged parallel to each other, and the two are jointly arranged on the axis of the pile centerline. On the same cylindrical surface; the length of the prestressed reinforcement 21 is greater than the length of the glass fiber reinforcement 22, and the two ends of the prestressed reinforcement 21 are respectively fixedly connected with the anchor plates 11 arranged at the two ends of the pile body 10, and the prestressed reinforcement 21 It is welded and connected with the spiral stirrup 23, and the glass fiber reinforcement 22 is bound and connected with the spiral stirrup 23; the glass fiber reinforcement 22 is a non-prestressed reinforcement.
图1中的桩体为空心的，当然桩体也可以采用实心的。The pile body in Fig. 1 is hollow, but of course the pile body can also be solid.
当预应力钢筋21和玻璃纤维筋22混合配筋时，二者的数量可以参照表1中的数值选取：When the prestressed steel bar 21 and the glass fiber bar 22 are mixed, the quantity of the two can be selected with reference to the values in Table 1:
表1 配筋一览表Table 1 list of reinforcement
当玻璃纤维筋22的数量等于预应力钢筋21的数量时，二者可以按照如图2所示的方式排布，即玻璃纤维筋22和预应力钢筋21沿圆周方向彼此间隔交错排布；当玻璃纤维筋22的数量少于预应力钢筋21的数量时，二者可以按照如图3所示的方式排布，即玻璃纤维筋22分散在预应力钢筋21之间。When the quantity of glass fiber reinforcement 22 is equal to the quantity of prestressing reinforcement 21, the two can be arranged according to the mode as shown in Figure 2, namely glass fiber reinforcement 22 and prestressing reinforcement 21 are arranged in a staggered manner along the circumferential direction; When the number of glass fiber bars 22 is less than that of prestressed steel bars 21, the two can be arranged as shown in FIG. 3, that is, glass fiber bars 22 are dispersed among prestressed steel bars 21.
如图2所示，所述钢筋骨架笼20还包括设置在预应力钢筋21和玻璃纤维筋22内侧的焊接加劲箍24，所述预应力钢筋21与焊接加劲箍24焊接连接在一起，所述玻璃纤维筋22与焊接加劲箍24绑扎连接在一起。As shown in Figure 2, the steel bar skeleton cage 20 also includes welded stiffeners 24 arranged inside the prestressed steel bars 21 and glass fiber bars 22, the prestressed steel bars 21 are welded together with the welded stiffeners 24, the The glass fiber bars 22 are tied together with the welding stiffeners 24 .
如图4所示，所述钢筋骨架笼20还设置有绑扎段钢筋25，所述绑扎段钢筋25与玻璃纤维筋22平行排布，且绑扎段钢筋25与玻璃纤维筋22通过扎丝26绑扎在一起，所述绑扎段钢筋25与螺旋箍筋23或焊接加劲箍24焊接连接在一起。As shown in FIG. 4 , the steel bar skeleton cage 20 is also provided with binding section steel bars 25 , the binding section steel bars 25 are arranged in parallel with the glass fiber bars 22 , and the binding section steel bars 25 and the glass fiber bars 22 are bound by binding wires 26 Together, the binding segment steel bar 25 is welded together with the spiral stirrup 23 or the welded stiffening hoop 24 .
当然，所述钢筋骨架笼20还可以设置有构造筋，所述构造筋与玻璃纤维筋或预应力钢筋绑扎连接在一起。Certainly, the steel bar skeleton cage 20 may also be provided with structural bars, and the structural bars are tied together with glass fiber bars or prestressed steel bars.
所述预应力钢筋21在锚固时，预应力钢筋21的端部固定在锚固板11的锚固系统110上，如图5所示，所述锚固系统11由锚固孔111、过筋槽112、张拉孔113组成；预应力钢筋21的端部依次穿过张拉孔113、过筋槽112而固定在锚固孔111上，以实现与锚固板11的连接。When the prestressed steel bar 21 is anchored, the end of the prestressed steel bar 21 is fixed on the anchor system 110 of the anchor plate 11. As shown in Figure 5, the anchor system 11 consists of an anchor hole 111, a rib groove 112, a The end of the prestressed steel bar 21 is fixed on the anchor hole 111 through the tension hole 113 and the tendon groove 112 in order to realize the connection with the anchor plate 11 .
Claims (7)
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106087979A (en) * | 2016-07-28 | 2016-11-09 | 安徽省建筑科学研究设计院 | A kind of steel reinforcement framework cage in concrete precast pile |
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| CN113931168A (en) * | 2021-10-19 | 2022-01-14 | 安徽省公路桥梁工程有限公司 | Connecting structure of precast pile configured with glass fiber reinforcement and construction method of connecting structure |
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| CN115126159A (en) * | 2022-06-24 | 2022-09-30 | 保利长大工程有限公司 | Glass fiber pile foundation reinforcement cage and construction method thereof |
| CN116198015A (en) * | 2022-12-13 | 2023-06-02 | 同济大学 | A kind of processing preparation method of prestressed carbon fiber concrete pile |
| CN116516947A (en) * | 2023-03-16 | 2023-08-01 | 同济大学 | High-durability maintenance-free prestressed carbon fiber concrete pile |
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| CN106192993A (en) * | 2016-07-14 | 2016-12-07 | 河海大学 | Modified GFRP muscle and reinforcing bar Concrete Structure anticorrosion stake and preparation method |
| CN106087979A (en) * | 2016-07-28 | 2016-11-09 | 安徽省建筑科学研究设计院 | A kind of steel reinforcement framework cage in concrete precast pile |
| CN106087979B (en) * | 2016-07-28 | 2019-04-23 | 安徽省建筑科学研究设计院 | A reinforced skeleton cage used in concrete prefabricated piles |
| CN106869137A (en) * | 2017-02-27 | 2017-06-20 | 淮北宇鑫新型材料有限公司 | One kind mixing steel reinforcement cage and foundation pit supporting pile |
| CN107130589A (en) * | 2017-06-07 | 2017-09-05 | 安徽省建筑科学研究设计院 | A kind of asymmetric compound armored concrete poured support stake |
| CN107130598A (en) * | 2017-06-07 | 2017-09-05 | 安徽省建筑科学研究设计院 | A kind of glass fibre rib concrete pile containing optical fiber |
| CN108330989A (en) * | 2018-04-17 | 2018-07-27 | 安徽省建筑科学研究设计院 | A kind of Ω types foundation pit supporting pile and its connection structure |
| CN108411903A (en) * | 2018-04-19 | 2018-08-17 | 安徽省建筑科学研究设计院 | A kind of concrete support pile including basalt fibre arrangement of reinforcement |
| CN108442360A (en) * | 2018-04-19 | 2018-08-24 | 安徽省建筑科学研究设计院 | A kind of concrete support pile including carbon fiber arrangement of reinforcement |
| CN108411903B (en) * | 2018-04-19 | 2024-04-05 | 安徽省建筑科学研究设计院 | Concrete support pile comprising basalt fiber reinforced bars |
| CN113846628A (en) * | 2021-10-15 | 2021-12-28 | 建华建材（中国）有限公司 | A kind of prefabricated pile with mixed reinforcement and its production method |
| CN113931168A (en) * | 2021-10-19 | 2022-01-14 | 安徽省公路桥梁工程有限公司 | Connecting structure of precast pile configured with glass fiber reinforcement and construction method of connecting structure |
| CN113931168B (en) * | 2021-10-19 | 2023-03-14 | 安徽省公路桥梁工程有限公司 | A connection structure of prefabricated piles equipped with glass fiber reinforcement and its construction method |
| CN114108677A (en) * | 2021-12-10 | 2022-03-01 | 安徽省公路桥梁工程有限公司 | Precast pile with glass fiber reinforced bars and pile forming and connecting mode |
| CN115126159A (en) * | 2022-06-24 | 2022-09-30 | 保利长大工程有限公司 | Glass fiber pile foundation reinforcement cage and construction method thereof |
| CN116198015A (en) * | 2022-12-13 | 2023-06-02 | 同济大学 | A kind of processing preparation method of prestressed carbon fiber concrete pile |
| CN116516947A (en) * | 2023-03-16 | 2023-08-01 | 同济大学 | High-durability maintenance-free prestressed carbon fiber concrete pile |
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