CN110725195A - A connection method and application of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and poured after RPC - Google Patents
A connection method and application of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and poured after RPC Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 77
- 239000010959 steel Substances 0.000 title claims abstract description 77
- 238000004873 anchoring Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 12
- 238000007711 solidification Methods 0.000 claims abstract description 4
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- 238000003466 welding Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 abstract description 13
- 238000012423 maintenance Methods 0.000 abstract description 3
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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
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
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Abstract
涉及一种装配式桥墩与承台锚固钢筋套插后浇RPC的连接方法,将预制墩柱和地基承台连接,包括:(1)在预制墩柱下端预埋锚固钢筋并用箍筋固定;在地基承台顶面设置预留坑槽,在地基承台预留坑槽的底部预埋锚固钢筋并用箍筋固定;(2)起吊预制墩柱,预制墩柱对准预留坑槽,预制墩柱的锚固钢筋的外伸连接段套在地基承台的锚固钢筋的外伸连接段外;(3)向预留坑槽内浇筑活性粉末混凝土,待凝固达到强度后完成连接。还涉及一种装配式桥墩与承台锚固钢筋套插后浇RPC的连接方法的应用,应用于单孔跨径40m范围内的中小跨径高架桥、立交桥。本发明只需常温养护,具有施工方法简便、速度快、受力可靠的优点,属于建筑施工技术领域。
The invention relates to a connection method of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC. The prefabricated pier column and the foundation cap are connected, including: (1) pre-embedding the anchor steel bar at the lower end of the prefabricated pier column and fixing it with stirrups; A reserved pit is set on the top surface of the foundation cap, and anchoring steel bars are pre-embedded at the bottom of the reserved pit of the foundation cap and fixed with stirrups; (2) The prefabricated pier is lifted, and the prefabricated pier is aligned with the reserved pit, and the prefabricated pier The overhanging connecting section of the anchoring steel bar of the column is sleeved outside the overhanging connecting section of the anchoring steel bar of the foundation cap; (3) The active powder concrete is poured into the reserved pit and the connection is completed after the solidification reaches the strength. The invention also relates to the application of a connection method of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC, which is applied to medium and small-span viaducts and overpasses with a single-hole span of 40m. The invention only needs normal temperature maintenance, has the advantages of simple and convenient construction method, high speed and reliable force, and belongs to the technical field of building construction.
Description
技术领域technical field
本发明涉及建筑施工技术领域,具体涉及一种装配式桥墩与承台锚固钢筋套插后浇RPC的连接方法及其应用。The invention relates to the technical field of building construction, in particular to a connection method of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC and its application.
背景技术Background technique
在城市交通中,中小跨径的高架桥、立交桥应用最广泛,桥梁施工时,需占用一定的地面,会对车辆和行人通行造成一定影响,甚至很大的影响。In urban traffic, viaducts and overpasses with medium and small spans are the most widely used. During the construction of bridges, a certain amount of ground needs to be occupied, which will have a certain or even great impact on the passage of vehicles and pedestrians.
现有桥梁最常规的施工方法中,桥墩都采用现浇混凝土施工,由于现场浇筑混凝土及养护,造成占地面积大、工期长,对交通影响大。需采用尽量缩短工期、占地小的施工方法。In the most conventional construction methods of existing bridges, the piers are all constructed with cast-in-place concrete. Due to the on-site pouring and maintenance of concrete, the area is large, the construction period is long, and the traffic is greatly affected. It is necessary to adopt a construction method that shortens the construction period as much as possible and occupies a small area.
发明内容SUMMARY OF THE INVENTION
针对现有城市中小跨径高架桥、立交桥施工方法对城市交通影响较大的技术问题,本发明的目的是:提供一种施工快速、不需要模板、连接可靠的一种装配式桥墩与承台锚固钢筋套插后浇RPC的连接方法及其应用。Aiming at the technical problem that the construction methods of the existing urban medium and small span viaducts and overpasses have a greater impact on urban traffic, the purpose of the present invention is to provide a kind of prefabricated bridge pier and cap anchorage that is fast in construction, does not require formwork, and has reliable connection The connection method and application of RPC after inserting and inserting steel bars.
为了达到上述目的,本发明采用如下技术方案:In order to achieve the above object, the present invention adopts the following technical solutions:
一种装配式桥墩与承台锚固钢筋套插后浇RPC的连接方法,将预制墩柱和地基承台连接,包括如下步骤:(1)在预制墩柱下端预埋锚固钢筋并用箍筋固定,在地基承台顶面设置预留坑槽,在地基承台的预留坑槽的底部预埋锚固钢筋并用箍筋固定;(2)起吊预制墩柱,预制墩柱对准预留坑槽,预制墩柱的锚固钢筋的外伸连接段套在地基承台的锚固钢筋的外伸连接段外;(3)向预留坑槽内浇筑活性粉末混凝土,待凝固达到强度后完成连接。A connection method of prefabricated bridge pier and cap anchoring steel bar sleeve inserting and pouring RPC, connecting a prefabricated pier column and a foundation cap, comprising the following steps: (1) pre-embedding anchor steel bars at the lower end of the prefabricated pier column and fixing with stirrups, A reserved pit is set on the top surface of the foundation cap, and anchoring steel bars are embedded at the bottom of the reserved pit of the foundation cap and fixed with stirrups; (2) The prefabricated pier is lifted, and the prefabricated pier is aligned with the reserved pit. The overhanging connection section of the anchoring steel bar of the prefabricated pier column is sleeved outside the overhanging connecting section of the anchoring steel bar of the foundation cap; (3) The active powder concrete is poured into the reserved pit and the connection is completed after the solidification reaches the strength.
作为一种优选,连接后通过常温养护。As a preference, it is cured at room temperature after connection.
作为一种优选,步骤(1)具体为:预制墩柱的下端预埋锚固钢筋,锚固钢筋包括位于预制墩柱混凝土内的埋置段和位于预制墩柱混凝土外的外伸连接段,锚固钢筋排列成预制墩柱的截面形状,锚固钢筋通过箍筋固定;地基承台设有预留坑槽,地基承台内预埋锚固钢筋,锚固钢筋包括位于地基承台混凝土内的埋置段,还包括位于地基承台混凝土外且位于预留坑槽内的外伸连接段,锚固钢筋排列形状与预制墩柱形状相应,锚固钢筋通过箍筋固定。As a kind of preference, step (1) is specifically as follows: the lower end of the prefabricated pier is pre-embedded with anchoring steel bars, and the anchoring steel bars include an embedded section located in the prefabricated pier column concrete and an overhanging connecting section located outside the prefabricated pier column concrete. Arranged in the cross-sectional shape of prefabricated piers, the anchoring steel bars are fixed by stirrups; the foundation caps are provided with reserved pits, and the anchoring steel bars are pre-embedded in the foundation caps. It includes the outrigger connection section located outside the foundation cap concrete and located in the reserved pit groove, the arrangement shape of the anchoring steel bar is corresponding to the shape of the prefabricated pier column, and the anchoring steel bar is fixed by the stirrup.
作为一种优选,预制墩柱的截面形状为圆形或矩形,预制墩柱及地基承台的锚固钢筋排列形状与预制墩柱的截面形状相同。As a preference, the cross-sectional shape of the prefabricated pier column is circular or rectangular, and the arrangement shape of the anchoring steel bars of the prefabricated pier column and the foundation cap is the same as the cross-sectional shape of the prefabricated pier column.
作为一种优选,预制墩柱锚固钢筋及地基承台锚固钢筋的埋置段和外伸连接段长度与预制墩柱的截面长边的长度相等,但外伸连接段长度小于预留坑槽的深度5-10厘米;地基承台的锚固钢筋围成的形状尺寸小于预制墩柱的锚固钢筋围成的形状尺寸,相距8-12厘米。As a preference, the length of the embedded section and the overhanging connecting section of the prefabricated pier column anchoring steel bar and the foundation cap anchoring steel bar are equal to the length of the long side of the section of the prefabricated pier column, but the length of the overhanging connecting section is less than the length of the reserved pit. The depth is 5-10 cm; the shape and size of the anchoring steel bars of the foundation cap are smaller than the shape and size of the anchoring steel bars of the prefabricated piers, and the distance is 8-12 cm.
作为一种优选,预留坑槽的截面形状与预制墩柱的截面形状相同;预制墩柱的截面尺寸小于预留坑槽的截面尺寸10-15厘米。As a preference, the cross-sectional shape of the reserved pit is the same as that of the prefabricated pier; the cross-sectional size of the prefabricated pier is 10-15 cm smaller than that of the reserved pit.
作为一种优选,步骤(1)中,预制墩柱和地基承台中,锚固钢筋沿着竖直方向设置,沿着水平方向排列成环形,环形的箍筋沿着高低位置依次排列,箍筋之间间隔10-15厘米,抹成斜面。As a preference, in step (1), in the prefabricated piers and foundation caps, the anchoring steel bars are arranged along the vertical direction and arranged in a ring shape along the horizontal direction, and the ring-shaped stirrups are arranged in order along the high and low positions. The interval is 10-15 cm, and it is smeared into a bevel.
作为一种优选,锚固钢筋和箍筋通过焊接或绑扎固定。As a preference, the anchoring steel bars and stirrups are fixed by welding or binding.
作为一种优选,步骤(3)中,浇筑的活性粉末混凝土高于地基承台的顶面5-10厘米。As a preference, in step (3), the poured reactive powder concrete is 5-10 cm higher than the top surface of the foundation cap.
一种装配式桥墩与承台锚固钢筋套插后浇RPC的连接方法的应用,应用于单孔跨径40m范围内的中小跨径高架桥、立交桥。The application of a connection method of a prefabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC is applied to medium and small-span viaducts and overpasses with a single-hole span of 40m.
总的说来,本发明具有如下优点:In general, the present invention has the following advantages:
1.结构简单,施工便捷,只需常温养护,可缩短工期,少占场地,减少对城市交通的影响。1. The structure is simple and the construction is convenient. It only needs to be maintained at room temperature, which can shorten the construction period, occupy less space and reduce the impact on urban traffic.
2.实现城市中小跨径桥梁装配式桥墩与承台基础连接的快速施工。2. Realize the rapid construction of the connection between the prefabricated piers and the bearing platform foundation of urban medium and small span bridges.
3.接头钢筋构造简单,后浇筑的RPC强度高,受力可靠。3. The joint reinforcement structure is simple, and the post-cast RPC has high strength and reliable force.
4.活性粉末混凝土具有强度高、耐腐蚀、耐久性好的特性,不需要蒸汽养护,常温养护24小时,抗压强度可达65MPa以上,抗折强度可达10MPa以上,可进行桥墩其他的拼装工作。通过活性粉末混凝土连接,使接头具有较强的抗拉能力和受力可靠性,实现桥梁下部结构的快速拼接。4. Active powder concrete has the characteristics of high strength, corrosion resistance and good durability. It does not need steam curing. It can be cured at room temperature for 24 hours. The compressive strength can reach more than 65MPa, and the flexural strength can reach more than 10MPa. Work. Connected by active powder concrete, the joint has strong tensile capacity and mechanical reliability, and the rapid splicing of the bridge substructure is realized.
附图说明Description of drawings
图1是一种装配式桥墩与承台锚固钢筋套插后浇RPC的连接方法的示意图。Figure 1 is a schematic diagram of a connection method of a fabricated bridge pier and a cap anchoring steel bar sleeve inserted and then poured RPC.
图2是实施例一的矩形墩柱连接结构A-A方向的剖视图。FIG. 2 is a cross-sectional view of the rectangular pier-column connection structure in the A-A direction according to the first embodiment.
图3是实施例二的圆形墩柱连接结构A-A方向的剖视图。3 is a cross-sectional view of the circular pier-column connection structure of the second embodiment in the direction A-A.
图4是拼装前的结构分部示意图。Figure 4 is a schematic diagram of the structure before assembly.
其中,1是预制墩柱,2是地基承台,3是预制墩柱的锚固钢筋,4为预制墩柱的箍筋,5为预留坑槽,6为地基承台的锚固钢筋,7为地基承台的箍筋,8为活性粉末混凝土。Among them, 1 is the prefabricated pier column, 2 is the foundation cap, 3 is the anchoring steel bar of the prefabricated pier column, 4 is the stirrup of the prefabricated pier column, 5 is the reserved pit, 6 is the anchoring steel bar of the foundation cap, and 7 is the The stirrups of the foundation cap, 8 are reactive powder concrete.
具体实施方式Detailed ways
下面将结合具体实施方式来对本发明做进一步详细的说明。The present invention will be described in further detail below in conjunction with specific embodiments.
实施例一Example 1
一种装配式桥墩与承台锚固钢筋套插后浇RPC的连接方法,具体包括如下步骤:A method for connecting a prefabricated bridge pier and a cap anchoring steel bar sleeve and then pouring RPC, specifically comprising the following steps:
(1)在预制墩柱下端沿截面周边预埋锚固钢筋,锚固钢筋的埋置段和外伸连接段长度约等于预制墩柱截面的长边长度或直径长度,并用间距约15厘米的箍筋焊接或绑扎固定。(1) Pre-embed anchor steel bars at the lower end of the prefabricated pier column along the periphery of the section. The length of the embedded section and the overhanging connection section of the anchor steel bar is approximately equal to the length of the long side or the diameter of the section of the prefabricated pier column, and stirrups with a spacing of about 15 cm are used. Welding or binding to fix.
(2)在地基承台顶面设置预留坑槽,预留槽深大于预制墩柱预埋的锚固钢筋伸出的连接长度5-10厘米,预制坑槽的平面形状与预制墩柱的截面形状相同,但平面尺寸周边都大于预制墩柱的截面尺寸约10~15厘米,以便预制墩柱的下端插入。(2) Set a reserved pit groove on the top surface of the foundation cap. The depth of the reserved groove is 5-10 cm greater than the connecting length of the anchoring steel bars embedded in the prefabricated pier column. The plane shape of the prefabricated pit groove and the cross section of the prefabricated pier column The shape is the same, but the plane size and the periphery are larger than the section size of the prefabricated pier by about 10-15 cm, so that the lower end of the prefabricated pier can be inserted.
(3)地基承台的预留坑槽底部也预埋有锚固钢筋,其布置平面形状与预制墩柱的锚固钢筋一致,并互相错开,周边尺寸小于预制墩柱的锚固钢筋所围周边尺寸,锚固钢筋的外伸连接段的长度与预制墩柱预埋的锚固钢筋伸出的连接长度一致,并用间距约15厘米的箍筋焊接或绑扎固定。(3) Anchoring steel bars are also pre-buried at the bottom of the reserved pits of the foundation caps, and their layout plan is consistent with the anchoring steel bars of the prefabricated piers and staggered from each other. The length of the overhanging connection section of the anchoring steel bar is the same as the connecting length of the anchoring steel bar embedded in the prefabricated pier and column, and is fixed by welding or binding with stirrups with a spacing of about 15 cm.
(4)起吊墩柱下端预制装配件,预制墩柱的锚固钢筋的外伸连接段向下伸入地基承台的预留坑槽中,将地基承台的锚固钢筋的外伸连接段套入其内。(4) Lift the prefabricated assembly at the lower end of the pier column, and the overhanging connection section of the anchoring steel bar of the prefabricated pier column extends downward into the reserved pit groove of the foundation cap, and the overhanging connection section of the anchoring steel bar of the foundation cap is sleeved. within it.
(5)预制墩柱定位准确后,浇筑活性粉末混凝土至高出地基承台顶面5~10厘米为止,待凝固达到强度后完成连接。(5) After the prefabricated piers are positioned accurately, pour the reactive powder concrete until it is 5 to 10 cm above the top surface of the foundation cap, and complete the connection after the solidification reaches the strength.
上述连接方法常温养护24小时后,连接处RPC强度可以达到65MPa以上。After the above connection method is cured at room temperature for 24 hours, the RPC strength of the connection can reach more than 65MPa.
本实施例中,预制墩柱的截面形状为矩形,预留坑槽的截面形状也为矩形,但周边大于前者10厘米;预制墩柱的锚固钢筋排列成矩形环状,距混凝土截面边缘7厘米;地基承台的锚固钢筋也排列成矩形环状,但尺寸小于预制墩柱的锚固钢筋围成的矩形环尺寸,两个矩形环相距10-15厘米;预制墩柱的锚固钢筋的埋置段和外伸连接段长度及地基承台的锚固钢筋的连接段长度等于预制墩柱的横截面长边的长度,但外伸连接段长度小于预留坑槽的深度5-10厘米。In this embodiment, the cross-sectional shape of the prefabricated pier is rectangular, and the cross-sectional shape of the reserved pit is also rectangular, but the circumference is 10 cm larger than the former; the anchoring bars of the prefabricated pier are arranged in a rectangular ring, 7 cm away from the edge of the concrete section ; The anchoring steel bars of the foundation cap are also arranged in a rectangular ring, but the size is smaller than the size of the rectangular ring enclosed by the anchoring steel bars of the prefabricated pier column, and the two rectangular rings are 10-15 cm apart; the embedded section of the anchoring steel bar of the prefabricated pier column The length of the connecting section with the overhanging connecting section and the anchoring steel bar of the foundation cap is equal to the length of the long side of the cross-section of the prefabricated pier column, but the length of the overhanging connecting section is 5-10 cm less than the depth of the reserved pit.
预制墩柱的锚固钢筋包括位于预制墩柱混凝土内的埋置段和位于预制墩柱混凝土外的外伸连接段,均通过箍筋固定。The anchoring steel bars of the prefabricated pier column include the embedded section located in the prefabricated pier column concrete and the overhanging connection section located outside the prefabricated pier column concrete, which are all fixed by stirrups.
地基承台设有预留坑槽,地基承台内的预埋锚固钢筋包括位于地基承台混凝土内的埋置段,还包括位于地基承台外且位于预留坑槽内的外伸连接段,均通过箍筋固定。The foundation cap is provided with a reserved pit, and the pre-embedded anchoring steel bars in the foundation cap include an embedded section located in the concrete of the foundation cap, and also includes an overhanging connecting section located outside the foundation cap and in the reserved pit. , are fixed by stirrups.
装配时,预制墩柱的锚固钢筋的外伸连接段套在地基承台的锚固钢筋的外伸连接段外,为了预留拼接空间,施工方便,两者相距约10厘米。预制墩柱和地基承台中,锚固钢筋沿着竖直方向设置,沿着水平方向排列成环形,由封闭的箍筋焊接或绑扎固定,箍筋间隔10~15厘米。During assembly, the overhanging connecting section of the anchoring steel bar of the prefabricated pier column is sleeved outside the overhanging connecting section of the anchoring steel bar of the foundation cap. In order to reserve space for splicing and facilitate construction, the distance between the two is about 10 cm. In the prefabricated pier column and the foundation cap, the anchoring steel bars are arranged in the vertical direction, arranged in a ring shape along the horizontal direction, and are fixed by welding or tying closed stirrups with an interval of 10-15 cm.
预留坑槽内浇筑活性粉末混凝土。浇筑的活性粉末混凝土高于地基承台的顶面5~10厘米。活性粉末混凝土(Reactive Powder Concrete)在国内使用时间不长,具有强度高、耐腐蚀、耐久性好的特性,不需要蒸汽养护,常温养护24小时,抗压强度可达65MPa以上,抗折强度可达10MPa以上。Reactive powder concrete is poured in reserved pits. The poured reactive powder concrete is 5-10 cm higher than the top surface of the foundation cap. Reactive Powder Concrete has not been used for a long time in China. It has the characteristics of high strength, corrosion resistance and durability. It does not need steam curing. It can be cured at room temperature for 24 hours. The compressive strength can reach more than 65MPa, and the flexural strength can be up to 10MPa or more.
本发明通过锚固钢筋套接,并浇筑RPC将所有钢筋连接成整体,具有受力可靠、施工方便、速度快、只需要常温养护的特点外,不影响桥梁墩柱底的外观,很少影响墩柱周边地面的使用。The invention connects all the steel bars into a whole by anchoring the steel bars and pouring the RPC, which has the characteristics of reliable force, convenient construction, fast speed, and only needs normal temperature maintenance, does not affect the appearance of the bottom of the bridge pier column, and rarely affects the pier Use of the ground around the column.
将本发明应用于单孔跨径40m范围内中小跨径高架桥。The invention is applied to medium and small-span viaducts with a single-hole span of 40m.
实施例二
本实施例中,预制墩柱的截面形状为圆形,预留坑槽的截面形状也为圆形。只需要将实施例一中的涉及的矩形改为圆形,其余部分完全相同。In this embodiment, the cross-sectional shape of the prefabricated pier is circular, and the cross-sectional shape of the reserved pit is also circular. It is only necessary to change the rectangle involved in the first embodiment to a circle, and the rest are exactly the same.
将本发明应用于单孔跨径40m范围内中小跨径立交桥。The present invention is applied to small and medium-span overpasses with a single-hole span of 40m.
除了上述实施例提及的方式外,预制墩柱可为任何截面形状的混凝土预制装配式墩柱;锚固钢筋可为除了矩形环或圆环外的其他环状。这些变换方式均在本发明的保护范围内。In addition to the methods mentioned in the above embodiments, the prefabricated piers can be prefabricated concrete piers with any cross-sectional shape; the anchoring steel bars can be other annular rings except rectangular rings or circular rings. These transformations are all within the protection scope of the present invention.
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。The above-mentioned embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, The simplification should be equivalent replacement manners, which are all included in the protection scope of the present invention.
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CN113215968A (en) * | 2021-06-01 | 2021-08-06 | 深圳市市政设计研究院有限公司 | Connecting structure of bearing platform and prefabricated pier stud with adjustable wet joint form and construction method |
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CN113215968A (en) * | 2021-06-01 | 2021-08-06 | 深圳市市政设计研究院有限公司 | Connecting structure of bearing platform and prefabricated pier stud with adjustable wet joint form and construction method |
CN113235401A (en) * | 2021-06-10 | 2021-08-10 | 深圳市城市交通规划设计研究中心股份有限公司 | Prefabricated pier column and bearing platform connecting structure capable of adjusting wet joint mode and construction method |
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