WO2021143647A1 - 一种连续梁超长束钢绞线穿束施工方法 - Google Patents
一种连续梁超长束钢绞线穿束施工方法 Download PDFInfo
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- WO2021143647A1 WO2021143647A1 PCT/CN2021/071086 CN2021071086W WO2021143647A1 WO 2021143647 A1 WO2021143647 A1 WO 2021143647A1 CN 2021071086 W CN2021071086 W CN 2021071086W WO 2021143647 A1 WO2021143647 A1 WO 2021143647A1
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- Prior art keywords
- wire rope
- steel
- construction method
- steel wire
- continuous beam
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 114
- 239000010959 steel Substances 0.000 title claims abstract description 114
- 238000010276 construction Methods 0.000 title claims abstract description 51
- 239000003365 glass fiber Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 7
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 10
- 239000004035 construction material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
Definitions
- the embodiments of the present application relate to the technical field of bridge construction methods, in particular to a construction method of continuous beam ultra-long strand steel strands.
- the steel strands need to pass through the full bridge length for pre-stress tensioning. Due to the long length of the full bridge, the steel strands are long and heavy; and the inner diameter of the corrugated pipe embedded in the beam is small and corrugated. There are many pipe joints, the frictional resistance of the steel strand in the corrugated pipe is relatively large, and there is a problem that the steel strand is difficult to thread. At present, the domestic largest power beam piercing machine has 7 rounds of power and 11KW with frequency conversion, which cannot complete the 250-meter beam. The task of threading steel strands, and manual threading is even more difficult due to the excessive weight of the steel strands and the large moving friction in the corrugated pipe.
- the embodiment of the present application provides a construction method for the continuous beam ultra-long strand steel strands to solve the problem of the difficulty in the construction of the steel strands in the large-span bridge construction process in the prior art.
- a construction method for traversing an ultra-long steel strand of a continuous beam includes the following steps:
- Step S10 the glass fiber is bundled in the continuous beam through the glass fiber piercing machine
- Step S20 After the glass fiber passes, the glass fiber is connected to the first steel wire rope, and after the connection is manually pulled, the first steel wire rope is used as a lead wire;
- Step S30 connect the first steel wire rope with the second steel wire rope by buckle, and check the interface, arrange a winch on the side of the small mileage, use this winch for construction, and pull the second steel wire rope through the first steel wire rope;
- Step S40 Snap-connect the second steel wire rope with the multiple steel strands, drag the multiple steel strands from the corrugated pipe by the hoist, and fix the multiple steel strands with anchors.
- the beam length of the continuous beam is 250 meters.
- the diameter of the first steel wire rope is 12 mm; the diameter of the second steel wire rope is 20 mm.
- the hoisting machine is a low-power hoisting machine.
- step S40 the number of steel strands is 15.
- step S10 it is ensured that the tunnel is unobstructed during the beam threading process.
- the nominal diameter of the steel wire rope of the steel strand is D
- the range of the minimum breaking force coefficient K'of the steel wire rope is between 0.322 and 0.382.
- the value of the safety factor n is 5.
- the value of the friction coefficient ⁇ is determined according to the on-site pull experiment of the bellows.
- This application has the following advantages: through the construction method of this application, the construction equipment is simple, the construction materials are conventional materials, and are easy to obtain; the construction method is simple, easy to implement, and completes the tasks that the current largest beam piercing machine cannot complete; the construction speed is fast and can be The overall stranding of the steel strand is completed at one time; this method speeds up the stranding speed of the steel strand and achieves the purpose of saving cost compared with the use of the domestic maximum power piercing machine.
- Fig. 1 is a flow chart of a construction method for traversing a continuous beam with an ultra-long strand steel strand provided by some embodiments of the application.
- FIG. 2 is a 40-168-40 tied arch bridge structure diagram of a continuous beam ultra-long strand steel strand construction method provided by some embodiments of the application.
- Figure 3 is a continuous beam structure diagram of a continuous beam ultra-long strand steel strand construction method provided by some embodiments of the application.
- FIG. 4 is a schematic diagram of step S10 of a construction method for traversing an ultra-long steel strand of a continuous beam according to some embodiments of the application.
- FIG. 5 is a schematic diagram of step S20 of a construction method for traversing an ultra-long strand steel strand of a continuous beam according to some embodiments of the application.
- Fig. 6 is a schematic diagram of step S30 of a construction method for traversing a continuous beam with an ultra-long strand steel strand provided by some embodiments of the application.
- FIG. 7 is a schematic diagram of step S40 of a construction method for traversing an ultra-long strand steel strand of a continuous beam according to some embodiments of the application.
- the construction method of the continuous beam super-long strand steel stranded wire in this embodiment includes the following steps: step S10, the glass fiber 3 is bundled in the continuous beam 1 through a glass fiber piercing machine; S20. After the glass fiber 3 passes, the glass fiber 3 is connected to the first steel wire rope 4, and after the connection is manually pulled, the first steel wire rope 4 is used as the lead wire; step S30, the first steel wire rope 4 and the second steel wire rope 5 are adopted Snap connection, and check the interface, arrange a winch 9 on the side of the small mileage, use this winch 9 for construction, and pull the second wire rope 5 through the first wire rope 4; step S40, the second wire rope 5 and multiple The steel strands 6 are snap-connected, and the multiple steel strands 6 are dragged from the corrugated pipe 2 by the hoist 9, and the multiple steel strands 6 are fixed with anchors.
- Fig. 4 is a schematic diagram of step S10
- Fig. 5 is a schematic diagram of step S20
- Fig. 6 is a schematic diagram of step S30
- Fig. 7 is a schematic diagram of step S40.
- One side of the winch 9 and the right side of Figs. 4 to 7 are in the direction of large mileage.
- step S30 of the present embodiment since the glass fiber 3 is a hard plastic material, mechanical pulling cannot be used, and only manual labor can be used.
- the technical effects achieved by this embodiment are: through the construction method of this embodiment, the construction equipment is simple, the construction materials are conventional materials and are easy to obtain; the construction method is simple and easy to implement, and the task that the current largest beam piercing machine cannot complete is completed; The speed is fast, and the overall stranding of the steel strand 6 can be completed at one time; this method speeds up the stranding speed of the steel strand and achieves the purpose of saving cost compared with the use of the domestic maximum power stranding machine.
- the construction method of a continuous beam ultra-long strand steel stranded wire in this embodiment includes all the technical features in embodiment 1.
- the continuous beam 1 The length of the bundle is 250 meters; the diameter of the first steel wire rope 4 is 12mm; the diameter of the second steel wire rope 5 is 20mm; in step S30, the hoist 9 is a low-power hoist; in step S40, the number of steel strands 6 is 15 roots; in step S10, ensure that the tunnel is unobstructed during the piercing process.
- the newly-built Lianyungang-Xuzhou station front II bid 1 branch Donghai super bridge (40+168+40) m tied arch continuous beam 1, starting and ending construction mileage DK54+980.715 ⁇ DK55 +229.915, with a total length of 248.7m (including 0.80m from the beam end to the centerline of the side support on both sides).
- the longitudinal length of the full bridge is 249.5m, a total of 24 beams are used to cross the beam.
- the inner diameter of the corrugated pipe 2 in the continuous beam 1 is only 9cm.
- Each bundle is bent at 6 places, with an average bending angle of 12.4 degrees, which makes it extremely difficult to pass the bundle; the purpose of this embodiment is to provide a 250-meter-long steel stranded wire bundle construction method, which only requires a low-power windlass and glass fiber 3.
- the steel wire rope can be used to successfully thread 15 250-meter steel strands 6 (the steel strands 6 weighing 4 tons).
- This embodiment speeds up the stranding speed of the steel strand and achieves the purpose of saving cost compared with the use of the domestic maximum power beam piercing machine to pierce the bundle.
- the construction method of a continuous beam ultra-long strand steel strand in this embodiment includes all the technical features in Embodiment 1.
- the method of this embodiment involves the tensile strength of the steel wire rope. Because the 15 steel strands 6 have a relatively large weight, choosing a reasonable diameter of the steel wire rope is the core of this embodiment.
- the tensile strength of steel wire rope can be calculated according to the standard GB8918-2006:
- F 0 is the minimum breaking force of the wire rope, KN; D is the nominal diameter of the wire rope, mm; the nominal tensile strength of the wire rope, Mpa; R 0 is the minimum breaking force coefficient of the wire rope, between 0.322 and 0.382;
- F 0 is the minimum breaking force of the wire rope, KN;
- F is the minimum allowable breaking force of the wire rope, KN;
- n is the safety factor, which is generally selected as 5;
- a suitable wire rope diameter can be selected.
- wire rope model 16*19-20, IWS, wire rope diameter 20mm, wire rope nominal tensile strength R 0 is 1570, K'is 0.356, wire rope minimum breaking force F 0 is 223, safety factor n is 5, and the minimum allowable breaking force F of the wire rope is 44.6KN.
- the wire rope model is 16*19-18, IWS, the diameter of the wire rope is 18mm, the nominal tensile strength of the wire rope R 0 is 1570, K'is 0.356, the minimum breaking force F 0 of the wire rope is 181, the safety factor n is 5, and the minimum breaking of the wire rope
- the allowable pulling force F is 36.2KN.
- the weight of 15 250-meter steel strand 6 is 4.387 tons, the weight of G is 43KN, the friction coefficient ⁇ is 0.9, and the friction force f is 40.14KN.
- the method has simple construction equipment, and the construction materials are conventional materials, which are easy to obtain.
- the construction method is simple and easy to implement, completing the task that the current largest beam piercing machine cannot complete.
- the construction speed is fast, and the overall stranding of the steel strand 6 can be completed at one time.
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Abstract
Description
Claims (10)
- 一种连续梁超长束钢绞线穿束施工方法,其特征在于,包括以下步骤:步骤S10、将玻璃纤维(3)通过玻璃纤维穿束机在连续梁(1)中穿束;步骤S20、在玻璃纤维(3)通过之后,将玻璃纤维(3)与第一钢丝绳(4)连接,连接后采用人工拽拉,然后将第一钢丝绳(4)作为引线;步骤S30、将第一钢丝绳(4)与第二钢丝绳(5)采用卡扣连接,并检查接口,在小里程侧布置一台卷扬机(9),采用这台卷扬机(9)进行施工,将第二钢丝绳(5)通过第一钢丝绳(4)拽过来;步骤S40、将第二钢丝绳(5)与多根钢绞线(6)卡扣连接,通过卷扬机(9)将多根钢绞线(6)从波纹管(2)内拖拽过来,并将多根钢绞线(6)用锚具固定好。
- 根据权利要求1所述的一种连续梁超长束钢绞线穿束施工方法,其特征在于,在步骤S10中,所述连续梁(1)的穿束长为250米。
- 根据权利要求1所述的一种连续梁超长束钢绞线穿束施工方法,其特征在于,所述第一钢丝绳(4)的直径为12mm;所述第二钢丝绳(5)的直径为20mm。
- 根据权利要求1所述的一种连续梁超长束钢绞线穿束施工方法,其特征在于,在步骤S30中,所述卷扬机(9)为小功率卷扬机。
- 根据权利要求1所述的一种连续梁超长束钢绞线穿束施工方法,其特征在于,在步骤S40中,所述钢绞线(6)的数量为15根。
- 根据权利要求1所述的一种连续梁超长束钢绞线穿束施工方法,其特征在于,在步骤S10中,穿束过程中确保孔道通畅。
- 根据权利要求7所述的一种连续梁超长束钢绞线穿束施工方法,其特征在于,所述钢丝绳最小破断拉力系数K’的范围为0.322~0.382之间。
- 根据权利要求7所述的一种连续梁超长束钢绞线穿束施工方法,其特征在于,安全系数n的数值为5。
- 根据权利要求7所述的一种连续梁超长束钢绞线穿束施工方法,其特征在于,摩擦系数μ的数值根据现场波纹管(2)内拉拽实验确定。
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CN111236072A (zh) * | 2020-01-13 | 2020-06-05 | 中铁北京工程局集团(天津)工程有限公司 | 一种连续梁超长束钢绞线穿束施工方法 |
CN112195786A (zh) * | 2020-09-24 | 2021-01-08 | 中铁大桥局集团第一工程有限公司 | 一种长束预应力钢绞线穿束装置及钢绞线穿束方法 |
CN116695566B (zh) * | 2023-05-12 | 2024-04-09 | 中建八局第三建设有限公司 | 预应力混凝土梁的张拉施工工艺 |
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