CN109610877B - Node and method for improving crack resistance of prefabricated concrete frame structure - Google Patents
Node and method for improving crack resistance of prefabricated concrete frame structure Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003733 fiber-reinforced composite Substances 0.000 claims abstract description 16
- 239000003292 glue Substances 0.000 claims description 15
- 239000011241 protective layer Substances 0.000 claims description 14
- 230000002787 reinforcement Effects 0.000 claims description 10
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005336 cracking Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000084 colloidal system Substances 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/19—Three-dimensional framework structures
- E04B1/1903—Connecting nodes specially adapted therefor
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Abstract
Description
技术领域Technical field
本发明属于建筑领域，涉及预制装配式混凝土框架结构(简称“PC框架结构”)，特别涉及一种提高预制装配式混凝土框架结构抗裂性能的节点及方法。The invention belongs to the field of construction and relates to a prefabricated concrete frame structure (referred to as "PC frame structure"), and in particular to a node and method for improving the crack resistance of the prefabricated concrete frame structure.
背景技术Background technique
钢筋混凝土框架节点包括梁与柱相交的节点核心区以及邻近的梁端、柱端，在框架结构中起到传递内力和保持结构整体性的作用。Reinforced concrete frame nodes include the node core area where beams and columns intersect and adjacent beam ends and column ends, which play a role in transmitting internal forces and maintaining structural integrity in the frame structure.
PC框架结构具有质量好、生产效率高、工人劳动强度低等优点，其多通过在节点区域对预制梁、柱进行连接。相对于现浇混凝土结构，PC框架结构的连接部位因抗裂先天不足，是耐久性薄弱部位。The PC frame structure has the advantages of good quality, high production efficiency, and low labor intensity for workers. It mostly connects prefabricated beams and columns in the node area. Compared with cast-in-place concrete structures, the connection parts of PC frame structures are inherently weak in terms of crack resistance and are weak in durability.
PC框架结构的连接形式按照施工方法主要可归类为湿连接和干连接两种。其中，湿连接为主流处理方式，即现场作业连接，将拼缝部位预先伸出的钢筋、钢板或螺栓进行焊接、搭接或者机械连接，然后通过现场浇筑混凝土或其他灌缝浆料来实现拼装。此种方法中，预制混凝土构件与后续现浇混凝土只是粘结，无法真正成为一体，无法避免连接处裂缝的产生，容易成为渗漏水的通道，致使预制装配式建筑材料发生腐蚀，甚而导致安全事故的发生，对居民财产及生命安全造成隐患。因此，对这些拼缝部位采取有效的抗裂措施是十分必要的。The connection forms of PC frame structures can be mainly classified into two types: wet connection and dry connection according to the construction method. Among them, wet connection is the mainstream processing method, that is, on-site operation connection. The pre-extended steel bars, steel plates or bolts at the joint parts are welded, overlapped or mechanically connected, and then the assembly is realized by pouring concrete or other grouting slurries on site. . In this method, the prefabricated concrete components and the subsequent cast-in-place concrete are only bonded and cannot truly become one, and the occurrence of cracks at the joints cannot be avoided, which can easily become a channel for water leakage, causing corrosion of prefabricated building materials and even causing safety hazards. The occurrence of accidents causes hidden dangers to residents' property and life safety. Therefore, it is very necessary to take effective anti-crack measures for these joints.
发明内容Contents of the invention
本发明提供一种提高预制装配式混凝土框架结构抗裂性能的节点及方法，它通过在拼缝附近的梁侧面混凝土保护层中预留若干槽道，并安装纤维增强复合材板条，来提高拼缝处的抗裂性能，继而提高结构的耐久性和延长其服役周期。本发明适用于PC框架结构各类梁柱节点，施工便捷且效果明显，具有广阔的应用前景。The invention provides a node and a method for improving the crack resistance of a prefabricated concrete frame structure. It improves the crack resistance by reserving a number of channels in the concrete protective layer on the side of the beam near the joints and installing fiber reinforced composite laths. The crack resistance of the joints can improve the durability of the structure and extend its service life. The invention is suitable for various types of beam-column nodes of PC frame structures, has convenient construction and obvious effects, and has broad application prospects.
本发明的技术方案如下：The technical solution of the present invention is as follows:
一种提高预制装配式混凝土框架结构抗裂性能的节点，包括利用既有装配方法和技术完成的混凝土框架节点，以及在所述节点的拼缝附近的梁侧面混凝土保护层中预留的若干槽道，和利用结构胶安装在所述槽道内的纤维增强复合材板条。上述结构可以加强拼缝两侧预制结构的连接，提高拼缝的抗裂性能。A node that improves the crack resistance of a prefabricated concrete frame structure, including concrete frame nodes completed using existing assembly methods and technologies, and several slots reserved in the concrete protective layer on the side of the beam near the joints of the nodes channels, and fiber reinforced composite laths installed within said channels using structural adhesive. The above structure can strengthen the connection of the prefabricated structures on both sides of the joint and improve the crack resistance of the joint.
优选地，每个所述梁的侧面混凝土保护层中设置的所述槽道为多条，相应的，所述板条也为多根。Preferably, there are multiple channels provided in the concrete protective layer on the side of each beam, and correspondingly, there are multiple slats.
优选地，所述板条为单根薄板条或由结构胶粘贴的多根薄板条制成的整体。Preferably, the slat is a single thin slat or an integral body made of multiple thin slats bonded by structural glue.
优选地，所述板条的截面为矩形截面，其宽度bf取12～16mm，总厚度tf取6～8mm，所述板条的长度为自所述拼缝处往两侧各延伸10～12bf长度。上述参数的确定是根据经验及单根薄板条尺寸等综合确定的，能更好的满足抗裂性能。Preferably, the cross-section of the lath is a rectangular cross-section, with a width b f of 12 to 16 mm, a total thickness t f of 6 to 8 mm, and a length of the lath extending 10 mm from the seam to both sides. ~12b f length. The above parameters are determined based on experience and the size of a single thin strip, which can better meet the crack resistance performance.
优选地，所述槽道沿着所述梁的轴线对称平行布置，并沿所述梁的高度方向间距取80～100mm，且距所述梁的翼缘表面距离不高于1/4梁高且不低于40mm。如此设置可以得到更好的抗裂性能。Preferably, the channels are arranged symmetrically and parallel along the axis of the beam, with a spacing of 80 to 100 mm along the height direction of the beam, and the distance from the flange surface of the beam is no higher than 1/4 of the beam height. And not less than 40mm. This setting can achieve better crack resistance.
优选地，所述槽道尺寸的确定如下：槽道长度取板条长度；槽道深度取板条宽度bf的1.5倍；槽道宽度取板条厚度2tf和(tf+6mm)的较大者。如此设置可以得到更好的抗裂性能。Preferably, the channel size is determined as follows: the channel length is taken as the length of the lath; the channel depth is taken as 1.5 times the lath width b f ; the channel width is taken as the ratio of the lath thickness 2t f and (t f + 6mm) The larger one. This setting can achieve better crack resistance.
优选地，所述板条安装时，其宽度沿着所述槽道的深度方向，并通过结构胶居中安装入所述槽道。Preferably, when the slats are installed, their width is along the depth direction of the channel, and they are installed centrally into the channel through structural glue.
一种提高预制装配式混凝土框架结构抗裂性能的方法，首先进行板条设计及制作，并在预制构件加工过程中，据此于拼缝附近的梁侧面混凝土保护层中预留若干槽道，然后利用既有装配方法和技术完成混凝土框架节点装配，最后利用结构胶将板条安装在所述槽道内。A method to improve the crack resistance of a prefabricated concrete frame structure is to first design and produce the slats, and during the processing of the prefabricated components, reserve a number of channels in the concrete protective layer on the side of the beam near the joints. The concrete frame joints are then assembled using existing assembly methods and techniques, and finally the slats are installed in the channels using structural adhesive.
优选地，根据所述拼缝处的所述梁的截面尺寸及配筋情况，确定纤维增强复合材板条的数量、长度及其截面尺寸。Preferably, the number, length and cross-sectional size of the fiber-reinforced composite slats are determined based on the cross-sectional size and reinforcement conditions of the beam at the joint.
优选地，所述纤维增强复合材板条的长度及其尺寸确定如下：Preferably, the length and size of the fiber reinforced composite slats are determined as follows:
所述板条的截面优先选用矩形截面，其宽度bf取12～16mm，总厚度tf取6～8mm；所述板条的长度，自所述拼缝处往两侧各延伸10～12bf长度。The cross-section of the lath is preferably a rectangular cross-section, with a width b f of 12 to 16 mm and a total thickness t f of 6 to 8 mm; the length of the lath extends from the seam to both sides by 10 to 12 b f length.
优选地，所述板条为单根薄板条；或，当单根薄板条厚度不满足设定厚度时，可利用结构胶粘贴多根薄板条而制成。Preferably, the lath is a single thin lath; or, when the thickness of a single thin lath does not meet the set thickness, it can be made by attaching multiple thin laths using structural adhesive.
优选地，根据所述板条的数量及尺寸，确定槽道尺寸和布置方案。Preferably, the channel size and arrangement are determined according to the number and size of the slats.
优选地，所述槽道沿着所述梁的轴线对称平行布置，并沿所述梁的高度方向间距取80～100mm，且距所述梁的翼缘表面距离不高于1/4梁高且不低于40mm。Preferably, the channels are arranged symmetrically and parallel along the axis of the beam, with a spacing of 80 to 100 mm along the height direction of the beam, and the distance from the flange surface of the beam is no higher than 1/4 of the beam height. And not less than 40mm.
优选地，所述的槽道尺寸确定如下：所述槽道的长度取所述板条的长度；所述槽道的深度取所述板条的宽度bf的1.5倍；所述槽道的宽度取所述板条的厚度2tf和(tf+6mm)的较大者；所述槽道内壁加工为粗糙毛面，以便混凝土与胶体充分咬合。Preferably, the size of the channel is determined as follows: the length of the channel is the length of the strip; the depth of the channel is 1.5 times the width b f of the strip; The width is the larger of the thickness 2t f and (t f +6mm) of the lath; the inner wall of the channel is processed into a rough rough surface so that the concrete and colloid can fully engage.
优选地，将所述板条的宽度沿着所述槽道的深度方向，并通过结构胶，居中安装入所述槽道。Preferably, the width of the slats is along the depth direction of the channel and is installed centrally into the channel through structural glue.
优选地，所述纤维复合材选自碳纤维、玻璃纤维、玄武岩纤维或芳纶纤维复合材。Preferably, the fiber composite material is selected from carbon fiber, glass fiber, basalt fiber or aramid fiber composite material.
本发明还提供一种提高预制装配式混凝土框架结构抗裂性能的方法，其包括以下步骤：The invention also provides a method for improving the crack resistance of a prefabricated concrete frame structure, which includes the following steps:
(1)板条设计及制作(1) Slat design and production
根据拼缝处梁截面的尺寸及配筋情况，确定板条数量、长度及其截面尺寸，并制作板条；According to the size and reinforcement of the beam section at the joint, determine the number, length and cross-sectional size of the slats, and make the slats;
(2)槽道设计及预留(2)Channel design and reservation
根据板条数量及尺寸，确定槽道尺寸和布置方案，并预留槽道；According to the number and size of the slats, determine the channel size and layout plan, and reserve channels;
(3)板条安装(3)Slat installation
首先将槽道内壁凿毛，清尽杂质，然后通过结构胶，将板条居中装入槽道。First, chisel the inner wall of the channel to remove impurities, and then center the slats into the channel through structural glue.
依照本申请较佳实施例所述的一种提高预制装配式混凝土框架结构抗裂性能的方法，在步骤(1)中，根据拼缝处梁截面的尺寸及配筋情况，确定板条长度及其截面尺寸：According to a method for improving the crack resistance of a prefabricated concrete frame structure as described in the preferred embodiment of the present application, in step (1), according to the size and reinforcement of the beam section at the joint, the length and length of the slats are determined. Its cross-sectional dimensions:
所述板条截面优先选用矩形截面，其宽度bf取12～16mm，总厚度tf取6～8mm，单根薄板条厚度不满足时，可利用结构胶粘贴多根薄板条而得到符合厚度要求的板条；The lath cross-section is preferably a rectangular cross-section, with a width b f of 12 to 16 mm and a total thickness t f of 6 to 8 mm. When the thickness of a single thin lath does not meet the requirements, structural adhesive can be used to stick multiple thin laths to achieve the desired thickness. Laths of required thickness;
所述板条的长度，自拼缝处往两侧各延伸10～12bf长度。The length of the slats extends from the joint to both sides by a length of 10 to 12 b f .
依照本申请较佳实施例所述的一种提高预制装配式混凝土框架结构抗裂性能的方法，在步骤(2)中，所述的槽道尺寸确定如下：槽道长度取板条长度；槽道深度取板条宽度bf的1.5倍；槽道宽度取板条厚度2tf和(tf+6mm)的较大者；According to a method for improving the crack resistance of a prefabricated concrete frame structure according to the preferred embodiment of the present application, in step (2), the channel size is determined as follows: the channel length is the length of the lath; The channel depth is 1.5 times the lath width b f ; the channel width is the larger of the lath thickness 2t f and (t f +6mm);
所述的槽道布置方案如下：沿着梁轴线对称平行布置，沿梁高方向间距取80～100mm；距梁翼缘表面距离不高于1/4梁高且不低于40mm。The channel layout plan is as follows: symmetrically arranged in parallel along the beam axis, with a spacing of 80 to 100 mm along the beam height direction; the distance from the beam flange surface is no higher than 1/4 of the beam height and no less than 40 mm.
依照本申请较佳实施例所述的一种提高预制装配式混凝土框架结构抗裂性能的方法，在步骤(3)中，将板条宽度沿着槽道深度方向，通过结构胶，居中装入槽道。According to a method for improving the crack resistance of a prefabricated concrete frame structure as described in the preferred embodiment of the present application, in step (3), the width of the slats is installed in the center along the depth direction of the channel through structural glue. channel.
与现有技术相比，本发明的有益效果如下：Compared with the prior art, the beneficial effects of the present invention are as follows:
1、本发明的一种提高预制装配式混凝土框架结构抗裂性能的节点，针对预制装配式混凝土框架结构的拼缝部位抗裂性较差的缺陷，通过在拼缝处的梁截面混凝土保护层中预留若干槽道并安装纤维增强复合材板条，加强了拼缝两侧预制结构的连接，提高了拼缝抗裂性能；1. A node of the present invention that improves the crack resistance of a prefabricated concrete frame structure. Aiming at the shortcomings of poor crack resistance at the joints of the prefabricated concrete frame structure, the concrete protective layer of the beam section at the joints is used Several channels are reserved in the middle and fiber-reinforced composite slats are installed to strengthen the connection of the prefabricated structures on both sides of the joint and improve the crack resistance of the joint;
2、本发明的方法采用在节点拼缝处混凝土保护层上预留槽道并安装纤维增强复合材板条的方式，可用于加固各类预制装配式结构节点，适用范围广，具有施工便捷、安全性高且耐久性好等优点，应用前景广阔。2. The method of the present invention adopts the method of reserving channels on the concrete protective layer at the joint joints and installing fiber-reinforced composite laths. It can be used to reinforce various prefabricated structural nodes, has a wide range of applications, and has the advantages of convenient construction, It has the advantages of high safety and good durability, and has broad application prospects.
当然，实施本发明的任一产品并不一定需要同时达到以上所述的所有优点。Of course, any product implementing the present invention does not necessarily need to achieve all the above-mentioned advantages at the same time.
附图说明Description of the drawings
图1为本发明实施例1单根纤维增强复合材薄板条示意图；Figure 1 is a schematic diagram of a single fiber-reinforced composite thin lath according to Embodiment 1 of the present invention;
图2为本发明实施例1多根粘贴式纤维增强复合材板条示意图；Figure 2 is a schematic diagram of multiple pasted fiber reinforced composite laths in Embodiment 1 of the present invention;
图3为本发明实施例1用于成槽的矩形木条示意图；Figure 3 is a schematic diagram of rectangular wooden strips used to form grooves in Embodiment 1 of the present invention;
图4为本发明实施例1预制混凝土框架结构加固前的正立面图；Figure 4 is a front elevation view of the precast concrete frame structure before reinforcement according to Embodiment 1 of the present invention;
图5为本发明实施例1加固后的梁截面示意图；Figure 5 is a schematic cross-sectional view of the reinforced beam in Embodiment 1 of the present invention;
图6为本发明实施例1加固后的整体效果示意图；Figure 6 is a schematic diagram of the overall effect after reinforcement in Embodiment 1 of the present invention;
图中标号含义如下：The meanings of the numbers in the figure are as follows:
1-细薄板条；2-纤维增强复合材板条；3-木条；4-预制柱；5-预制梁；6-槽道；7-接缝。1-thin slats; 2-fiber reinforced composite slats; 3-wooden slats; 4-prefabricated columns; 5-prefabricated beams; 6-channels; 7-joints.
具体实施方式Detailed ways
针对背景技术中提到的问题，发明人发现，近20年发展起来的基于纤维增强复合材的加固方法，凭借高效高强、耐久性好等优点，一直是土木工程界的热点研究课题，如何将其合理应用于PC框架结构拼缝部位，进而有效改善拼缝开展过大等问题，提高结构的抗裂性能是本发明的关键。In response to the problems mentioned in the background art, the inventor found that the reinforcement method based on fiber-reinforced composite materials developed in the past 20 years has been a hot research topic in the civil engineering community due to its advantages such as high efficiency, high strength, and good durability. How to It is rationally applied to the joint parts of the PC frame structure, thereby effectively improving problems such as excessive joint development, and improving the crack resistance of the structure is the key to the invention.
本发明通过在拼缝附近的梁侧面混凝土保护层中预留若干槽道，并安装纤维增强复合材板条，来加强拼缝两侧预制结构的连接，提高拼缝处的抗裂性能，继而提高结构的耐久性和延长其服役周期。本发明适用于预制装配式混凝土框架结构各类梁柱节点，施工便捷且效果明显，具有广阔的应用前景，本发明的方法普遍适用于各类混凝土结构或构件接缝，适用范围广。The present invention reserves a number of channels in the concrete protective layer on the side of the beam near the joint and installs fiber reinforced composite laths to strengthen the connection of the prefabricated structures on both sides of the joint, improve the crack resistance of the joint, and then Improve the durability of the structure and extend its service life. The present invention is suitable for various types of beam-column joints of prefabricated concrete frame structures. The construction is convenient and the effect is obvious, and has broad application prospects. The method of the present invention is generally applicable to various types of concrete structures or component joints, and has a wide application range.
本发明的一种提高预制装配式混凝土框架结构抗裂性能的方法，即在拼缝附近的梁侧面混凝土保护层中预留槽道并安装纤维增强复合材板条，具体包括以下步骤：A method of improving the crack resistance of a prefabricated concrete frame structure according to the present invention is to reserve channels in the concrete protective layer on the side of the beam near the joints and install fiber reinforced composite laths, which specifically includes the following steps:
(1)板条设计及制作(1) Slat design and production
根据拼缝处梁截面的尺寸及配筋情况，确定板条数量、长度及其截面尺寸，并制作板条；According to the size and reinforcement of the beam section at the joint, determine the number, length and cross-sectional size of the slats, and make the slats;
确定板条尺寸：所述板条截面优先选用矩形截面，其宽度bf取12～16mm，总厚度tf取6～8mm；所述板条的长度，自拼缝处往两侧各延伸10～12bf长度；上述尺寸确定适用于通常梁、柱等构件的保护层在20-25mm之间的情况，槽道即设置在该保护层中；Determine the size of the slats: the rectangular cross-section is preferred for the slat cross section, the width b f is 12 to 16 mm, and the total thickness t f is 6 to 8 mm; the length of the slats extends from the joint to both sides by 10 mm. ~12b f length; the above dimensions are determined when the protective layer of beams, columns and other components is usually between 20-25mm, and the channel is set in the protective layer;
板条制作：单根薄板条厚度不满足时，可利用结构胶粘贴多根薄板条而制得所需板条，具体可根据所需板条尺寸裁剪相应长度的细薄板条，在细薄板条表面涂覆结构胶，经过多根细薄板条相互粘贴，制得所需要的板条。本发明所使用的板条抗拉强度高，一直处于弹性阶段，外部荷载卸掉后，能够自动回缩；Slat production: When the thickness of a single thin slat is not sufficient, structural adhesive can be used to glue multiple thin slats to obtain the required slats. Specifically, thin slats of corresponding length can be cut according to the required slat size. The surface of the strip is coated with structural adhesive, and multiple thin strips are pasted together to obtain the required strips. The laths used in the present invention have high tensile strength and are always in the elastic stage. They can automatically retract after the external load is removed;
(2)槽道设计及预留(2)Channel design and reservation
根据板条数量及尺寸，确定槽道尺寸和布置方案，并预留槽道；According to the number and size of the slats, determine the channel size and layout plan, and reserve channels;
具体地，specifically,
确定槽道布置：各槽道沿着梁的轴线对称平行布置，沿梁高方向间距取80～100mm；距梁翼缘表面距离不高于1/4梁高且不低于40mm，以达到理想的加固效果；Determine the channel layout: Each channel is arranged symmetrically and parallel along the axis of the beam, with a spacing of 80 to 100mm along the beam height direction; the distance from the beam flange surface is no higher than 1/4 of the beam height and no less than 40mm to achieve ideal reinforcement. Effect;
确定槽道尺寸：槽道长度取板条长度；槽道深度取板条宽度bf的1.5倍；槽道宽度取板条厚度2tf和(tf+6mm)的较大者；Determine the channel size: the channel length is taken as the length of the lath; the channel depth is taken as 1.5 times the lath width b f ; the channel width is taken as the larger of the lath thickness 2t f and (t f +6mm);
预留槽道：根据设计尺寸，在预制构件对应位置预留规定尺寸的槽道。槽道预留可通过在混凝土浇筑时放置相应尺寸的模具(如木方)，混凝土初凝后取出即可；Reserved channels: According to the design size, channels of specified sizes are reserved at the corresponding positions of the prefabricated components. The channel can be reserved by placing molds of corresponding sizes (such as wooden cubes) during concrete pouring, and then taking them out after the concrete has initially set;
(3)板条安装(3)Slat installation
首先将槽道内壁凿毛，清尽浮灰等杂质，然后通过结构胶，将板条居中装入槽道；First, chisel the inner wall of the channel to remove floating dust and other impurities, and then center the slats into the channel through structural glue;
具体地，specifically,
安装准备：将槽道内壁凿毛，清尽浮灰等，以便混凝土与胶体充分咬合；Installation preparation: Chisel the inner wall of the channel and remove floating dust, etc. so that the concrete and colloid can fully engage;
安装板条：先在槽内注入所需结构胶体的2/3体积，然后将板条宽度沿槽道深度方向，居中插入槽道。再注入剩余结构胶，使其充满整条槽道，最后用刮铲抹去多余胶。Install the slats: first inject 2/3 of the volume of the required structural colloid into the groove, and then insert the width of the slats into the channel along the depth direction of the channel. Then inject the remaining structural glue to fill the entire channel, and finally wipe off the excess glue with a spatula.
下面结合具体实施例，进一步阐述本发明。应该理解，这些实施例仅用于说明本发明，而不用于限定本发明的保护范围。在实际应用中本领域技术人员根据本发明做出的改进和调整，仍属于本发明的保护范围。本实施例中未明确的各组成部分均可用现有技术加以实现。The present invention will be further described below in conjunction with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the protection scope of the present invention. In practical applications, improvements and adjustments made by those skilled in the art based on the present invention still fall within the protection scope of the present invention. All components not specified in this embodiment can be implemented using existing technologies.
实施例1Example 1
本实施例以某边框架中节点为例，其预制柱4截面尺寸为600×600mm，预制梁5截面尺寸为250×400mm(腹板高380mm)，预制柱4和预制梁5在接缝7位置进行拼接，拼缝处存在潜在的抗裂性能不足的问题。In this embodiment, a node in a certain side frame is taken as an example. The cross-sectional size of the prefabricated column 4 is 600×600mm, and the cross-sectional size of the prefabricated beam 5 is 250×400mm (the web height is 380mm). The prefabricated column 4 and the prefabricated beam 5 are at the joint 7 The joints are spliced at different locations, and there is a potential problem of insufficient crack resistance at the joints.
如图1～2所示，根据待加固节点情况，将3片细薄板条1(宽16mm，厚2mm)粘贴在一起制得纤维增强复合材板条2，板条2截面宽16mm，厚6mm，长320mm(设置位置为从拼缝处两侧各延伸160mm)。板条2共计六根，梁截面腹板每侧三根，中间板条沿梁5轴线布置，两端板条沿与梁5轴线平行的方向布置；两端板条中心距梁翼缘表面100mm，各板条中心间距为100mm，板条中心与接缝7中心重合。As shown in Figures 1 and 2, according to the conditions of the nodes to be reinforced, three thin laths 1 (width 16mm, thickness 2mm) are pasted together to prepare fiber reinforced composite lath 2. The cross-section of lath 2 is 16mm wide and 6mm thick. , 320mm long (the setting position is to extend 160mm from both sides of the patchwork). There are six laths 2 in total, three on each side of the beam section web. The middle lath is arranged along the axis of beam 5, and the two end laths are arranged in a direction parallel to the beam 5 axis; the center of the two end laths is 100mm away from the beam flange surface, and each lath The center distance is 100mm, and the center of the slats coincides with the center of seam 7.
如图3～4所示，预留槽道6，在板条安装位置确定的前提下，先制作木条3，其长320mm，宽12mm，深24mm。待混凝土初凝时取出木条3，得到所需尺寸的槽道。As shown in Figures 3 to 4, reserve the channel 6. Under the premise that the installation position of the slats is determined, first make the wooden slats 3, which are 320mm long, 12mm wide and 24mm deep. When the concrete is initially set, take out the wooden strips 3 to obtain a channel of the required size.
如图5～6所示，现场安装时，先用凿子对槽道6的内壁进行凿毛处理，用气泵清尽槽内碎渣浮灰；然后在槽道6内注入2/3体积的结构胶，再将板条2的宽度沿着槽道6深度方向，居中插入槽道6；再填充结构胶，使其充满槽道6，充分包裹板条，最后用刮铲抹去梁表面多余胶水。As shown in Figures 5 and 6, during on-site installation, first use a chisel to roughen the inner wall of channel 6, and use an air pump to clean out the debris and floating ash in the channel; then inject 2/3 of the volume of the structure into channel 6 Glue, then insert the width of the slat 2 along the depth direction of the channel 6, and insert it into the center of the channel 6; then fill the structural glue so that it fills the channel 6, fully wrap the slats, and finally use a spatula to wipe off the excess glue on the surface of the beam. .
图6即为本实施例1边框架中节点加固后的整体效果示意图。Figure 6 is a schematic diagram of the overall effect after reinforcement of the nodes in the side frame of this embodiment 1.
本发明及上述实施例通过在拼缝处的梁截面混凝土保护层中预留若干槽道并安装纤维增强复合材板条，加强了拼缝两侧预制结构的连接，提高了拼缝抗裂性能。The present invention and the above-mentioned embodiments reserve a number of channels in the concrete protective layer of the beam section at the joint and install fiber-reinforced composite laths, thereby strengthening the connection of the prefabricated structures on both sides of the joint and improving the crack resistance of the joint. .
以上公开的本发明优选实施例只是用于帮助阐述本发明。优选实施例并没有详尽叙述所有的细节，也不限制该发明仅为所述的具体实施方式。显然，根据本说明书的内容，可作很多的修改和变化。本说明书选取并具体描述这些实施例，是为了更好地解释本发明的原理和实际应用，从而使所属技术领域技术人员能很好地理解和利用本发明。本发明仅受权利要求书及其全部范围和等效物的限制。The preferred embodiments of the invention disclosed above are only intended to help illustrate the invention. The preferred embodiments do not describe all details, nor do they limit the invention to the specific implementations described. Obviously, many modifications and variations are possible in light of the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can better understand and utilize the present invention. The invention is limited only by the claims and their full scope and equivalents.
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