CN103711328B - The bracing means of a kind of beams of concrete and construction method thereof - Google Patents
The bracing means of a kind of beams of concrete and construction method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title abstract description 63
- 238000010276 construction Methods 0.000 title abstract description 13
- 229910000831 Steel Inorganic materials 0.000 abstract description 40
- 239000010959 steel Substances 0.000 abstract description 40
- 230000002787 reinforcement Effects 0.000 abstract description 29
- 239000010410 layer Substances 0.000 abstract description 23
- 125000006850 spacer group Chemical group 0.000 abstract description 15
- 239000011229 interlayer Substances 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 12
- 230000008439 repair process Effects 0.000 description 6
- 210000003414 extremity Anatomy 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- 210000003141 lower extremity Anatomy 0.000 description 4
- 210000001364 upper extremity Anatomy 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 230000009916 joint effect Effects 0.000 description 2
- 238000012946 outsourcing Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
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Abstract
本发明提供了一种混凝土梁的加固装置，包括钢制槽体、内隔环和栓钉；所述钢制槽体为上表面开口的结构，且所述钢制槽体能够套设在混凝土梁的外部；所述钢制槽体与所述混凝土梁之间具有一夹层；所述钢制槽体上表面沿长轴两侧各水平向外延伸一上翼平台；所述栓钉彼此相隔一段距离分别固设于所述上翼平台；所述内隔环彼此相隔一段距离固设于所述钢制槽体的侧面和底面所围成的凹槽内。通过内隔环和栓钉将钢制槽体和混凝土梁、灌浆层固结在一起，这样既可提高混凝土梁的受弯和受剪承载性能，还可有效避免灌浆层脱落，保证具有长期的加固效果。本发明还提供了使用上述技术方案的一种施工方法，确保上述加固方案的有效实施。
The invention provides a reinforcement device for concrete beams, which includes a steel tank body, an inner spacer ring and pegs; the steel tank body is a structure with an upper surface opening, and the steel tank body can be sleeved The outside of the beam; there is an interlayer between the steel trough and the concrete beam; the upper surface of the steel trough extends outward horizontally along both sides of the long axis to an upper wing platform; the pegs are separated from each other A certain distance is respectively fixed on the upper wing platform; the inner spacer rings are fixed at a certain distance from each other in the groove surrounded by the side and the bottom of the steel tank body. The steel tank body, the concrete beam and the grouting layer are consolidated together through the inner spacer ring and the studs, which can not only improve the bending and shear bearing performance of the concrete beam, but also effectively prevent the grouting layer from falling off, ensuring long-term durability reinforcement effect. The present invention also provides a construction method using the above technical solution to ensure the effective implementation of the above reinforcement solution.
Description
技术领域technical field
本发明涉及一种建筑结构的加固装置及其施工方法，尤其涉及一种混凝土梁的加固装置及其施工方法。The invention relates to a reinforcement device of a building structure and a construction method thereof, in particular to a reinforcement device of a concrete beam and a construction method thereof.
背景技术Background technique
火灾、地震等灾害会对钢筋混凝土结构造成不同程度的损伤，但大多数钢筋混凝土结构经加固修复后仍可以正常使用，从而发挥巨大的经济效益，因此，对受损的或承载性能不足的钢筋混凝土结构的修复加固具有重要的意义。目前，混凝土梁的加固方法主要有：增大截面法、外贴纤维布法、外贴钢板法、外包角钢法、外包钢筋网细石混凝土法、体外预应力法等。上述传统加固方法普遍存在以下问题：(1)对于有表层损伤的混凝土梁，通常需要对已凿除掉表层损伤严重混凝土的剩余梁截面用灌浆料或细石混凝土先进行截面修复，之后再外包纤维布、角钢、钢筋网细石混凝土或施加体外预应力等进行加固,存在长期荷载和外部环境共同作用下表层的修补材料易脱落的隐患，大大影响长期加固效果。(2)外贴的加固材料和已修复的混凝土梁表面之间易发生脆性的剥离破坏。Fires, earthquakes and other disasters will cause different degrees of damage to reinforced concrete structures, but most reinforced concrete structures can still be used normally after reinforcement and repair, thereby exerting huge economic benefits. The repair and reinforcement of concrete structures is of great significance. At present, the reinforcement methods of concrete beams mainly include: increasing section method, external fiber cloth method, external steel plate method, outsourcing angle steel method, outsourcing steel mesh fine stone concrete method, external prestressing method, etc. The above-mentioned traditional reinforcement methods generally have the following problems: (1) For concrete beams with surface damage, it is usually necessary to repair the remaining beam sections with grouting materials or fine stone concrete for the remaining beam sections that have been chiseled to remove the severely damaged concrete, and then outsource Fiber cloth, angle steel, reinforced mesh fine stone concrete or external prestressing are applied for reinforcement. There is a hidden danger that the repair material on the surface layer is easy to fall off under the combined action of long-term load and external environment, which greatly affects the long-term reinforcement effect. (2) Brittle peeling damage is prone to occur between the external reinforcement material and the surface of the repaired concrete beam.
发明内容Contents of the invention
为了克服上述现有技术的缺点，本发明的目的在于提供一种可有效避免混凝土表面修复层脱落的发生，保持外贴的加固材料和修复层具有较好粘结锚固性能的混凝土梁加固装置，加固性能优良，经济性好，实用性强，具有广泛推广应用前景和良好工程应用价值。In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of concrete beam reinforcing device that can effectively avoid the occurrence of peeling off of the repair layer on the concrete surface, and keep the external reinforcement material and the repair layer with good bonding and anchoring performance. The reinforcement performance is excellent, the economy is good, the practicability is strong, and the utility model has the prospect of wide popularization and application and good engineering application value.
本发明的另一目的在于提供一种使用上述混凝土梁加固装置的施工方法，步骤简洁清晰，实施效率高。Another object of the present invention is to provide a construction method using the above concrete beam reinforcement device, which has simple and clear steps and high implementation efficiency.
为了解决上述的技术问题，本发明提供的一种混凝土梁的加固装置，包括钢制槽体、内隔环和栓钉；所述钢制槽体为上表面开口的结构，且所述钢制槽体能够套设在混凝土梁的外部；所述钢制槽体与所述混凝土梁之间具有一夹层；所述钢制槽体上表面沿长轴两侧各水平向外延伸一上翼平台；所述栓钉彼此相隔一段距离分别固设于所述上翼平台；所述内隔环彼此相隔一段距离固设于所述钢制槽体的侧面和底面所围成的凹槽内。In order to solve the above-mentioned technical problems, the present invention provides a reinforcement device for concrete beams, which includes a steel tank body, an inner spacer ring and pegs; the steel tank body is a structure with an upper surface opening, and the steel tank body The trough can be set outside the concrete beam; there is an interlayer between the steel trough and the concrete beam; the upper surface of the steel trough extends horizontally outward along both sides of the long axis to form an upper wing platform The pegs are respectively fixed on the upper wing platform at a distance from each other; the inner spacer rings are fixed at a distance from each other in the groove surrounded by the side and bottom of the steel tank body.
作为优选，所述钢制槽体为钢制U形槽体。Preferably, the steel tank body is a steel U-shaped tank body.
作为优选，所述内隔环由三个角钢的肢背和肢尖分别和所述凹槽的底面和侧面焊接而成。Preferably, the inner spacer ring is formed by welding the backs and tips of the limbs of three angle steels to the bottom and side surfaces of the groove respectively.
作为优选，与所述凹槽的底面焊接的角钢的肢高与该处的所述夹层的厚度相同。Preferably, the leg height of the angle steel welded to the bottom surface of the groove is the same as the thickness of the interlayer there.
作为优选，与所述凹槽的侧面焊接的角钢可加工为上下等肢高的形式，所述肢高略小于该处的所述夹层的厚度。As a preference, the angle steel welded to the side of the groove can be processed into the form of upper and lower leg heights, and the leg height is slightly smaller than the thickness of the interlayer there.
作为优选，与所述凹槽的侧面焊接的角钢可加工为下肢高宽上肢高窄的形式，下边缘处所述下肢高与该处的所述夹层厚度相同。As a preference, the angle steel welded to the side of the groove can be processed into a form in which the lower limbs are high, wide and the upper limbs are high and narrow, and the height of the lower limbs at the lower edge is the same as the thickness of the interlayer there.
作为优选，所述栓钉的位置与所述内隔环的位置对应。Preferably, the position of the peg corresponds to the position of the inner spacer ring.
作为优选，所述钢制槽体由钢板冷弯而成。Preferably, the steel tank body is cold-bent from a steel plate.
一种使用上述混凝土梁的加固装置的施工方法，其具体步骤为：A construction method using the reinforcing device of the above-mentioned concrete beam, the specific steps are:
1)凿除混凝土梁表层因火灾、环境侵蚀等损伤严重的混凝土，凿除后剩余的混凝土梁的截面尺寸应符合设计要求。1) The concrete on the surface of the concrete beam is seriously damaged due to fire, environmental erosion, etc., and the cross-sectional size of the remaining concrete beam after the chisel should meet the design requirements.
2)在混凝土梁的两侧与楼板交接处确定灌浆孔的位置并按要求进行钻凿。2) Determine the position of the grouting hole at the intersection of both sides of the concrete beam and the floor slab and drill as required.
3)在按设计要求加工所述一种混凝土梁的加固装置。3) Process the reinforcing device of the concrete beam according to the design requirements.
4)在所述钢制槽体的凹槽底部先涂覆一层灌浆料铺层。4) First coat a layer of grouting material on the bottom of the groove of the steel tank body.
5)清理受损混凝土梁表面；然后将所述一种混凝土梁的加固装置套设于混凝土梁外部。5) cleaning the surface of the damaged concrete beam; and then setting the strengthening device of the concrete beam on the outside of the concrete beam.
6)往灌浆孔中灌入灌浆料，直至灌浆料从相邻的灌浆孔中溢出为止，依次连续进行。6) Pour the grouting material into the grouting holes until the grouting material overflows from the adjacent grouting holes, and proceed successively in sequence.
作为优选，所述损伤严重的混凝土是指强度等级小于C20的混凝土。Preferably, the seriously damaged concrete refers to concrete whose strength grade is less than C20.
作为优选，所述灌浆孔的位置与设计的内隔环和栓钉的位置相匹配，也可以根据需要在相邻的两个灌浆孔之间加设灌浆孔。Preferably, the position of the grouting hole matches the designed positions of the inner spacer ring and the peg, and a grouting hole can also be added between two adjacent grouting holes as required.
作为优选，所述灌浆料铺层的厚度比与所述凹槽底部焊接的角钢的肢高大10-20mm。Preferably, the thickness of the grouting layer is 10-20mm larger than the height of the angle steel welded to the bottom of the groove.
作为优选，所述灌浆孔在灌浆完毕后用所述灌浆料修平。Preferably, the grouting hole is smoothed with the grouting material after the grouting is completed.
作为优选，所述灌浆料为自密实细石混凝土或CGM早强无收缩灌浆料。Preferably, the grouting material is self-compacting fine stone concrete or CGM early-strength non-shrinking grouting material.
作为优选，所述清理受损混凝土梁表面的具体步骤为：灌浆前24h，混凝土梁表面应充分润湿；灌浆前1h，清除积水；并根据需要在混凝土梁的表面涂覆一层建筑界面剂。Preferably, the specific steps of cleaning the surface of the damaged concrete beam are as follows: 24 hours before grouting, the surface of the concrete beam should be fully wetted; 1 hour before grouting, remove the accumulated water; and coat a layer of building interface on the surface of the concrete beam as required agent.
采用上述技术方案后，本发明提供的一种混凝土梁加固装置，由于其通过内隔环和栓钉将钢制槽体和混凝土梁、灌浆层固结在一起。与现有技术相比，可节约材料，有效避免传统加固方法在荷载和环境共同作用下灌浆层易脱落的问题以及加固材料与灌浆层之间粘结滑移的发生，且可同时提高混凝土梁的受弯和受剪承载性能，保证加固效果；另外，上述混凝土梁加固装置可在工厂预制，同时现场施工时也可减少模板用量，结构简单易于实现，应用范围广。After adopting the above technical solution, the invention provides a concrete beam strengthening device, because it consolidates the steel tank body, the concrete beam and the grouting layer together through the inner spacer ring and the pegs. Compared with the existing technology, it can save materials, effectively avoid the problem that the grouting layer is easy to fall off under the joint action of load and environment in the traditional reinforcement method, and the occurrence of bond slip between the reinforcement material and the grouting layer, and can improve the concrete beam at the same time. Excellent bending and shear bearing capacity to ensure the reinforcement effect; in addition, the above-mentioned concrete beam reinforcement device can be prefabricated in the factory, and at the same time, the amount of formwork can be reduced during on-site construction. The structure is simple and easy to implement, and it has a wide range of applications.
本发明还提出一种使用上述混凝土梁加固装置的施工方法，步骤简洁清晰，可确保上述加固方案的有效实施。The present invention also proposes a construction method using the above-mentioned concrete beam reinforcement device, the steps are simple and clear, and can ensure the effective implementation of the above-mentioned reinforcement scheme.
附图说明Description of drawings
图1为本发明优选实施例的示意图；Fig. 1 is the schematic diagram of preferred embodiment of the present invention;
图2为本发明优选实施例的施工状态横向剖面图；Fig. 2 is the transverse sectional view of the construction status of the preferred embodiment of the present invention;
图3为本发明优选实施例的施工状态纵向侧面图；Fig. 3 is the longitudinal side view of the construction status of the preferred embodiment of the present invention;
图4为本发明优选实施例的施工状态俯视图；Fig. 4 is the top view of the construction state of the preferred embodiment of the present invention;
图中：In the picture:
1-钢制U形槽体；2-内隔环；3-栓钉；4-灌浆孔；5-凿除损伤层后的混凝土梁；6-混凝土楼板翼缘。1-Steel U-shaped tank body; 2-Inner spacer ring; 3-Peg; 4-Grouting hole; 5-Concrete beam after removing the damaged layer; 6-Concrete floor flange.
具体实施方式detailed description
以下结合附图及实施例对本发明做进一步阐述。The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.
参考图1，本发明提供的一种混凝土梁的加固装置，为套设于混凝土梁外部的钢制槽体，本实施例优选为钢制U形槽体1、内隔环2和栓钉3。所述钢制U形槽体与所述混凝土梁之间具有一夹层；所述钢制U形槽体上表面沿长轴两侧各水平延伸一上翼平台。所述内隔环由三个角钢的肢背和肢尖分别和所述钢制U形槽体1的U形凹槽的底面和侧面焊接而成。其中与所述U形凹槽的底面相焊接的角钢长度与所述U形凹槽的内侧净宽相等，肢高与该处所述夹层的厚度相同；与所述U形凹槽的侧面相焊接的角钢可加工为上下等肢高或下肢高宽上肢高窄的形式，但下边缘的肢高与该处的所述夹层的厚度相同。这主要是考虑到火灾后混凝土梁两侧的损伤层厚度下宽上窄的情况。所述栓钉的位置与所述内隔环的位置对应，并分别固设于所述上翼平台。With reference to Fig. 1, a kind of reinforcing device of concrete beam provided by the present invention is a steel tank body sheathed on the outside of the concrete beam, preferably a steel U-shaped tank body 1, an inner spacer ring 2 and a peg 3 in this embodiment . There is an interlayer between the steel U-shaped trough and the concrete beam; the upper surface of the steel U-shaped trough extends horizontally along both sides of the long axis with an upper wing platform. The inner spacer ring is formed by welding the limb backs and limb tips of three angle steels to the bottom and side surfaces of the U-shaped groove of the steel U-shaped groove body 1 respectively. Wherein the length of the angle steel welded with the bottom surface of the U-shaped groove is equal to the inner clear width of the U-shaped groove, and the limb height is the same as the thickness of the interlayer at this place; The welded angle steel can be processed into the form that the upper and lower limbs are high or the lower limbs are high and the upper limbs are high and narrow, but the limb height of the lower edge is the same as the thickness of the interlayer there. This is mainly due to the fact that the thickness of the damaged layer on both sides of the concrete beam after the fire is wide at the bottom and narrow at the top. The positions of the pegs correspond to the positions of the inner spacer rings, and are respectively fixed on the upper wing platform.
参考图2-4，在遭受火灾的混凝土梁表面凿除损伤严重的混凝土层，所述损伤严重的混凝土指强度等级小于C20的混凝土。凿除损伤层后的混凝土梁5的截面形状与三面受火时混凝土梁截面的500℃等温线所包围的核心区截面相似且适合外置加固装置的安装，底面和两侧应有一定的粗糙度。Referring to Figs. 2-4, the severely damaged concrete layer is chiseled off on the surface of the concrete beam subjected to fire, and the seriously damaged concrete refers to concrete whose strength grade is less than C20. The section shape of the concrete beam 5 after the damaged layer is removed is similar to the section of the core area surrounded by the 500°C isotherm of the concrete beam section when the three sides are exposed to fire, and is suitable for the installation of external reinforcement devices. The bottom surface and both sides should have certain roughness Spend.
在混凝土梁5的两侧与楼板6的交接处对应内隔环2和栓钉3的位置根据需要钻凿竖向灌浆孔4。进一步地，当两个相邻的灌浆孔之间距离较远时，可以根据灌浆施工要求在相邻灌浆孔中间补充钻凿灌浆孔4。Vertical grouting holes 4 are drilled at the junctions between the two sides of the concrete beam 5 and the floor 6 corresponding to the positions of the inner spacer ring 2 and the pegs 3 as required. Further, when the distance between two adjacent grouting holes is relatively long, the grouting hole 4 can be additionally drilled in the middle of the adjacent grouting holes according to the grouting construction requirements.
对所述凿除损伤层后的混凝土梁5进行表面预处理：灌浆前24h，混凝土梁表面应充分润湿；灌浆前1h，清除积水；并根据需要在混凝土梁的表面涂覆一层建筑界面剂。Carry out surface pretreatment on the concrete beam 5 after the damaged layer is removed: 24 hours before grouting, the surface of the concrete beam should be fully wetted; 1 hour before grouting, remove the accumulated water; and coat a layer of building water on the surface of the concrete beam as required interface agent.
在钢制U形槽体1的U形凹槽底部涂覆一层厚度大于焊接于U形凹槽底部的角钢肢高10mm-20mm的灌浆层后，将所述加固装置自下而上紧套于上述经过表面预处理的混凝土梁5外部。在所述灌浆孔4中灌入灌浆料，直至灌浆料从相邻的灌浆孔中溢出为止，依次连续进行。所述灌浆料可为自密实细石混凝土、CGM早强无收缩灌浆料等具有一定强度的无收缩灌浆料。通过调整钢制U形槽体1和灌浆层的厚度，实现混凝土梁5的抗弯加固和抗剪加固，且可有效避免灌浆层的脱落。After the bottom of the U-shaped groove of the steel U-shaped groove body 1 is coated with a layer of grouting layer whose thickness is 10mm-20mm higher than the height of the angle steel leg welded on the bottom of the U-shaped groove, the reinforcement device is tightened from bottom to top Outside the above-mentioned concrete beam 5 that has undergone surface pretreatment. The grouting material is poured into the grouting hole 4 until the grouting material overflows from the adjacent grouting hole, and it is carried out sequentially and continuously. The grouting material can be self-compacting fine stone concrete, CGM early-strength non-shrinking grouting material with certain strength and non-shrinking grouting material. By adjusting the thickness of the steel U-shaped groove body 1 and the grouting layer, the bending and shearing reinforcement of the concrete beam 5 can be realized, and the grouting layer can be effectively prevented from falling off.
灌浆完成后，用所述灌浆料填平所述灌浆孔。After the grouting is completed, the grouting hole is filled up with the grouting material.
采用上述技术方案后，本发明提供的一种混凝土梁加固装置，由于其通过内隔环和栓钉将钢制U形槽体和混凝土梁、灌浆层固结在一起。与现有技术相比，可节约材料，有效避免传统加固方法在荷载和环境共同作用下灌浆层易脱落的问题以及加固材料与灌浆层之间粘结滑移的发生，且可同时提高混凝土梁的受弯和受剪承载性能，保证加固效果；另外，上述混凝土梁加固装置可在工厂预制，同时现场施工时也可减少模板用量，结构简单易于实现，应用范围广。After adopting the above technical solution, the invention provides a concrete beam reinforcing device, because it consolidates the steel U-shaped trough, the concrete beam, and the grouting layer together through the inner spacer ring and the pegs. Compared with the existing technology, it can save materials, effectively avoid the problem that the grouting layer is easy to fall off under the joint action of load and environment in the traditional reinforcement method, and the occurrence of bond slip between the reinforcement material and the grouting layer, and can improve the concrete beam at the same time. Excellent bending and shear bearing capacity to ensure the reinforcement effect; in addition, the above-mentioned concrete beam reinforcement device can be prefabricated in the factory, and at the same time, the amount of formwork can be reduced during on-site construction. The structure is simple and easy to implement, and it has a wide range of applications.
本发明的产品形式并非限于本案图示和实施例，任何人对其进行类似思路的适当变化或修饰，皆应视为不脱离本发明的专利保护范畴。The product form of the present invention is not limited to the illustrations and examples of this case, and anyone who makes appropriate changes or modifications of similar ideas to it shall be deemed not to depart from the scope of patent protection of the present invention.
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| CN104075077A (en) * | 2014-06-10 | 2014-10-01 | 北京豪特耐管道设备有限公司 | Heat insulating material for repairing heat pipeline and preparation method and application thereof |
| CN104863379B (en) * | 2015-05-11 | 2018-01-19 | 河南理工大学 | Special reinforced concrete beam strengthening member and its effective reinforcement means and application |
| CN108396986A (en) * | 2018-05-10 | 2018-08-14 | 上海建工二建集团有限公司 | reinforced structure and construction method of overlapped prefabricated L-shaped prestressed rib beam plate |
| CN114033205A (en) * | 2021-11-05 | 2022-02-11 | 北京航空航天大学 | Method for improving performance of existing steel-concrete composite beam |
| CN114541799A (en) * | 2022-01-26 | 2022-05-27 | 上海民航新时代机场设计研究院有限公司 | Concrete beam repairing structure and repairing method applicable to same |
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