CN101397854B - Enveloping prestressing force fastening type steel tube concrete column and reinforcement method - Google Patents

Enveloping prestressing force fastening type steel tube concrete column and reinforcement method Download PDF

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CN101397854B
CN101397854B CN2008103001871A CN200810300187A CN101397854B CN 101397854 B CN101397854 B CN 101397854B CN 2008103001871 A CN2008103001871 A CN 2008103001871A CN 200810300187 A CN200810300187 A CN 200810300187A CN 101397854 B CN101397854 B CN 101397854B
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steel plate
steel
reinforced concrete
section
strength bolt
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CN101397854A (en
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马克俭
卢亚琴
李华平
覃士杰
董云
魏艳辉
马华
段渝忠
苏丹
覃亮
田子东
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GUIYANG ARCHITECTURE DESIGN INSTITUTE Co Ltd
Guizhou University
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Guizhou University
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Abstract

本发明公开了一种外包预应力紧固式钢管混凝土柱及加固的方法。本发明主要应用于单层、多层与高层框架柱因强度、刚度或轴压比限值超限后的加固补强。它的基本原理是使外加于矩形或圆形钢筋混凝土柱表面的钢板，通过扭剪型高强螺栓拧紧后建立横向预拉力，其合力作用于钢筋混凝土柱表面，根据作用力等于反作用力原理，钢筋混凝土柱表面亦对钢板内壁产生反作用力(正压力)，从而使混凝土表面与钢板内侧面具有与正压力相应的摩擦力，即工程中的抗剪承载力，达到现行先有钢管再浇注混凝土的钢管混凝土柱的受力效果。由于横向预应力的存在，其力学效果比前者更佳。

Figure 200810300187

The invention discloses an outsourcing prestressed fastening type steel pipe concrete column and a strengthening method. The invention is mainly applied to the reinforcement of single-layer, multi-layer and high-rise frame columns after the limit value of strength, stiffness or axial compression ratio exceeds the limit. Its basic principle is to make the steel plate added to the surface of the rectangular or circular reinforced concrete column, through torsion shear type high-strength bolts tightened to establish a transverse pre-tension force, the resultant force acts on the surface of the reinforced concrete column, according to the principle that the action force is equal to the reaction force, the steel bar The surface of the concrete column also produces a reaction force (positive pressure) on the inner wall of the steel plate, so that the concrete surface and the inner surface of the steel plate have a friction force corresponding to the positive pressure, that is, the shear bearing capacity in the project, reaching the existing steel pipe and then pouring concrete The force effect of concrete filled steel tube columns. Due to the existence of transverse prestress, its mechanical effect is better than the former.

Figure 200810300187

Description

外包预应力紧固式钢管混凝土柱及加固的方法Outsourcing Prestressed Fastening Concrete Steel Tube Column and Its Reinforcement Method

技术领域 technical field

本发明涉及一种混凝土柱结构及加固的方法，尤其是一种外包预应力紧固式钢管混凝土柱及加固的方法，属于建筑结构的技术领域。The invention relates to a concrete column structure and a reinforcement method, in particular to an outsourcing prestressed fastening type steel pipe concrete column and a reinforcement method, belonging to the technical field of building structures.

背景技术 Background technique

目前，对于高层建筑的钢管混凝土柱子在制作时，通常先制作钢管，然后往钢管里浇灌混凝土，这种柱子存在的问题是混凝土在高温定形时会发生收缩，使混凝土与钢管存在间隙，难以融为一体。对于现成建筑的加层，为增加柱子的强度、刚度，往往需要对柱子进行加固，目前通常采用在现有的柱子外面包角钢加缀板方式进行加固，这种方法很难保证钢板与原混凝土传递剪力共同工作，而只能考虑钢构架与原混凝土分开承担结构的强度和刚度，其主要原因在于钢板面与混凝土面之间无正压力，即不能传递剪力，无共同工作的基本前提。还有一种就是直接在现有的混凝土柱四周浇注钢筋混凝土，使柱截面增大，若不采用植筋等方法，仍然不能保证两者共同工作，此加固方法俗称“穿棉袄”，不但费工费时，施工难度大，造价也偏高。At present, when making concrete-filled steel pipe columns in high-rise buildings, steel pipes are usually made first, and then concrete is poured into the steel pipes. The problem with this kind of columns is that the concrete will shrink when it is set at high temperature, so that there is a gap between the concrete and the steel pipes, making it difficult to melt. as one. For the addition of floors to existing buildings, in order to increase the strength and rigidity of the columns, it is often necessary to reinforce the columns. At present, it is usually reinforced by wrapping angle steel outside the existing columns and adding panels. This method is difficult to ensure that the steel plate and the original concrete Transmit shear force to work together, but can only consider the strength and stiffness of the steel frame and the original concrete structure separately. The main reason is that there is no positive pressure between the steel plate surface and the concrete surface, that is, the shear force cannot be transmitted, and there is no basic premise for joint work. . Another method is to pour reinforced concrete directly around the existing concrete column to increase the cross section of the column. If no methods such as planting bars are used, the two cannot be guaranteed to work together. Time-consuming, difficult construction, high cost.

发明内容 Contents of the invention

本发明所要解决的技术问题是，提供一种外包预应力紧固式钢管混凝土柱的加固方法，同时提供一种外包预应力紧固式钢管混凝土柱的结构形式。该加固方法及结构可将被加固的混凝土柱与外包钢板通过预应力紧贴为一体，从而共同工作提高混凝土柱的刚度和强度，满足使用需求。The technical problem to be solved by the present invention is to provide a reinforcement method for outsourcing prestressed fastening type concrete-filled steel pipe columns, and at the same time provide a structural form of outsourced prestressed fastening type steel pipe concrete columns. The reinforcement method and structure can make the reinforced concrete column and the outsourcing steel plate close together through prestressing, so as to work together to improve the rigidity and strength of the concrete column and meet the use requirements.

为解决上述技术问题，本发明采用如下技术方案：外包预应力紧固式钢管混凝土柱加固的方法，包括以下步骤：In order to solve the above-mentioned technical problems, the present invention adopts the following technical scheme: the method for reinforcing the outsourcing prestressed fastening type concrete filled steel tube column comprises the following steps:

(1)对原有的钢筋混凝土柱进行检查和修整，将表面打磨、清理平整；(1) Check and repair the original reinforced concrete columns, polish and clean the surface;

(2)在钢筋混凝土柱上钻孔，植入钢筋；植入钢筋的直径为16～25mm，植入深度为160～250mm；(2) Drill holes on the reinforced concrete column and implant steel bars; the diameter of the implanted steel bars is 16-25mm, and the implantation depth is 160-250mm;

(3)在钢筋混凝土柱的表面刷耐高温结构胶，然后在钢筋混凝土柱的表面分段外包已开孔的钢板，钢板孔径大于植筋直径，植筋露出钢板表面20～40mm。(3) Brush high-temperature-resistant structural glue on the surface of the reinforced concrete column, and then cover the surface of the reinforced concrete column with steel plates that have been opened in sections. The hole diameter of the steel plate is larger than the diameter of the planting bar, and the planting bar is exposed to the surface of the steel plate by 20-40mm.

(4)在钢板的螺栓支托架上穿入扭剪型高强螺栓，拧紧高强螺栓，使钢板横向建立预拉力，并利用作用力与反作用力相等原理使高强螺栓与钢板之间产生正压力，从而具有抗剪性能的摩擦力，使钢板紧贴于钢筋混凝土柱表面；(4) Insert torsional shear type high-strength bolts on the bolt support bracket of the steel plate, and tighten the high-strength bolts to make the steel plate transversely establish a pre-tension force, and use the principle of equal force and reaction force to generate positive pressure between the high-strength bolts and the steel plate, Therefore, it has the friction force of shear resistance, so that the steel plate is close to the surface of the reinforced concrete column;

(5)将钢板的所有接缝采用坡口对焊，使所有钢板连为封闭整体；(5) All the seams of the steel plates are welded by grooves, so that all the steel plates are connected as a closed whole;

(6)分别将植筋头钢筋与钢板围焊焊牢；然后外包高标号并掺防火粉的钢丝网水泥砂浆。(6) Weld and weld the steel bars of the planting bar head and the steel plate firmly; then outsource the steel mesh cement mortar with high grade and mixed with fireproof powder.

外包预应力紧固式钢管混凝土矩形柱。包括矩形的钢筋混凝土柱，在矩形的钢筋混凝土柱每一段的四角外表面包有4块角钢状钢板，在角钢状钢板之间装有与角钢状钢板等高的矩形钢板；在钢筋混凝土柱每一段的每个表面有两条竖直缝，竖直缝之间设有扭剪型高强螺栓支托架，在扭剪型高强螺栓支托架上穿有扭剪型高强螺栓，每一段的角钢状钢板和矩形钢板按钢筋混凝土柱的植筋位置开有孔，并通过该孔挂在矩形钢筋混凝土柱表面，矩形钢板与角钢状钢板之间用扭剪型高强螺栓固定连接为一体。Outsourced prestressed fastening concrete-filled rectangular columns. Including rectangular reinforced concrete columns, there are 4 angle steel-shaped steel plates wrapped around the four corners of each section of the rectangular reinforced concrete columns, and rectangular steel plates with the same height as the angle steel-shaped steel plates are installed between the angle steel-shaped steel plates; each section of the reinforced concrete column There are two vertical seams on each surface, between the vertical seams is a torsional shear type high-strength bolt support bracket, and a torsional shear type high-strength bolt is worn on the torsional shear type high-strength bolt support bracket, and the angle steel shape of each section The steel plate and the rectangular steel plate are provided with holes according to the position of the reinforced concrete column, and are hung on the surface of the rectangular reinforced concrete column through the hole.

所述的角钢状钢板是L形的等肢角钢型截面，矩形钢板为一字型截面。The angle-steel-shaped steel plate is an L-shaped equal-leg angle-steel cross-section, and the rectangular steel plate is a straight cross-section.

在矩形钢板的外表层点焊有钢丝网片，并刷有加防火粉的高标号水泥防火砂浆，其厚度按防火等级确定。The outer layer of the rectangular steel plate is spot-welded with steel wire mesh, and brushed with high-grade cement fireproof mortar with fireproof powder, and its thickness is determined according to the fireproof level.

外包预应力紧固式钢管混凝土圆柱。包括圆形的钢筋混凝土柱，在圆形的钢筋混凝土柱表面根据柱直径的大小紧贴有4～8块圆弧状截面钢板，圆弧状截面钢板根据柱高分为若干段，在接缝处端部设置有扭剪型高强螺栓支托架，在扭剪型高强螺栓支托架上穿有扭剪型高强螺栓，每一段的圆弧状截面钢板按钢筋混凝土柱的植筋位置开有孔，并通过该孔挂在钢筋混凝土柱表面，圆弧状截面钢板之间通过扭剪型高强螺栓固定连接为一体。Outsourced prestressed fastened steel tube concrete cylinder. Including circular reinforced concrete columns, on the surface of the circular reinforced concrete columns, there are 4 to 8 arc-shaped cross-section steel plates according to the size of the column diameter. The arc-shaped cross-section steel plates are divided into several sections according to the column height. There is a torsional shear type high-strength bolt support bracket at the end, and a torsional shear type high-strength bolt is threaded on the torsional shear type high-strength bolt support bracket. The arc-shaped cross-section steel plate of each section is cut according to the planting position of the reinforced concrete column. hole, and hang on the surface of the reinforced concrete column through the hole, and the arc-shaped cross-section steel plates are fixed and connected as a whole by torsional shear type high-strength bolts.

所述的圆弧状截面钢板是1/4圆弧形或1/8圆弧形截面。The arc-shaped section steel plate is a 1/4 arc-shaped or 1/8 arc-shaped section.

在圆弧状截面钢板的外表层点焊有钢丝网片，并刷有加防火粉的高标号水泥防火砂浆，其厚度按防火等级确定。Steel wire mesh is spot-welded on the outer layer of the arc-shaped steel plate, and it is brushed with high-grade cement fireproof mortar with fireproof powder, and its thickness is determined according to the fireproof grade.

与现有技术相比，本发明使用紧固钢板外包在混凝土柱的表面，并采用扭剪型高强度螺栓进行紧固连接，扭剪型高强度螺栓施加预应力的方法为用拧断螺栓梅花头切口处截面来控制预应力数值，这种螺栓施加预应力简单、准确。通过扭剪型高强度螺栓从四周向中间产生挤压力和预紧力，使被加固的混凝土柱表面与外包的紧固钢板紧贴在一起，并产生正压力，通过接触面的抗剪承载力，使两者共同工作，不但加固效果好，施工难度小且省时、省力、造价较低。它的基本原理是使外加于矩形或圆形钢筋混凝土柱表面的紧固钢板，通过扭剪型高强螺栓拧紧后建立横向预拉力，其合力作用于钢筋混凝土柱表面，根据作用力等于反作用力原理，钢筋混凝土柱表面亦对紧固钢板内壁产生反作用力(正压力)，从而使混凝土表面与紧固钢板内侧面具有与正压力相应的摩擦力，即工程中的抗剪承载力，达到现行先有钢管再浇注混凝土的钢管混凝土柱的受力效果。由于横向预应力的存在，其力学效果比前者更佳。在外包钢板外侧，利用植筋头和扭剪型高强螺栓支托架作固定点，点焊钢丝网片后，再刷掺有防火粉的耐火砂浆，其厚度按防火等级确定。本发明主要应用于单层、多层与高层框架柱因强度、刚度或轴压比限值超限后的加固补强。Compared with the prior art, the present invention uses fastening steel plates to wrap the surface of the concrete column, and uses high-strength torsional-shear bolts for fastening and connection. The prestressing value is controlled by the section at the head cutout, and the prestressing of this bolt is simple and accurate. The torsional shear type high-strength bolts generate extrusion force and pre-tightening force from the periphery to the middle, so that the surface of the reinforced concrete column and the outer fastening steel plate are closely connected together, and a positive pressure is generated, and the shear load of the contact surface is passed. Force, so that the two work together, not only the reinforcement effect is good, the construction difficulty is small, time-saving, labor-saving, and low cost. Its basic principle is to make the fastening steel plate added to the surface of the rectangular or circular reinforced concrete column, and then establish a transverse pretension force after being tightened by torsional shear type high-strength bolts, and its resultant force acts on the surface of the reinforced concrete column. , the surface of the reinforced concrete column also produces a reaction force (positive pressure) on the inner wall of the fastening steel plate, so that the concrete surface and the inner surface of the fastening steel plate have a friction force corresponding to the positive pressure, that is, the shear bearing capacity in the project, reaching the current advanced Mechanics of CFST columns with recast concrete from steel pipes. Due to the existence of transverse prestress, its mechanical effect is better than the former. On the outer side of the outsourcing steel plate, use the planting head and torsional shear type high-strength bolt bracket as the fixing point. After spot welding the steel wire mesh, brush the refractory mortar mixed with fireproof powder. The thickness is determined according to the fireproof level. The invention is mainly applied to the reinforcement of single-layer, multi-layer and high-rise frame columns after the limit value of strength, stiffness or axial compression ratio exceeds the limit.

附图说明 Description of drawings

图1是本发明外包预应力紧固式钢管混凝土矩形柱的侧面结构示意图；Fig. 1 is the side structure schematic diagram of outsourcing prestressed fastening type concrete filled steel pipe rectangular column of the present invention;

图2是本发明外包预应力紧固式钢管混凝土矩形柱的截面构造示意图；Fig. 2 is the schematic cross-sectional structure schematic diagram of the outsourcing prestressed fastening type concrete filled steel pipe rectangular column of the present invention;

图3是本发明外包预应力紧固式钢管混凝土矩形柱表面作用力(横向预应力)与反作用力(柱对钢板的反作用力)相等形成力的自平衡体系；Fig. 3 is a self-balancing system in which the surface force (transverse prestress) and reaction force (the reaction force of the column to the steel plate) are equal to form a force on the surface of the outsourcing prestressed fastening type concrete filled steel pipe rectangular column of the present invention;

图4是本发明外包预应力紧固式圆形钢管混凝土柱的截面构造示意图；Fig. 4 is a schematic diagram of the cross-sectional structure of the outsourcing prestressed fastening type circular steel pipe concrete column of the present invention;

图5是本发明外包预应力紧固式圆形钢管混凝土柱截面作用力(环向预拉力)与反作用力(柱对钢板径向的反作用力)相等形成力的自平衡体系。Fig. 5 is a self-balancing system in which the section action force (circumferential pretension) and reaction force (the radial reaction force of the column to the steel plate) of the outsourcing prestressed fastening circular steel pipe concrete column section of the present invention are equal to form a force.

具体实施方式 Detailed ways

本发明的实施例1：外包预应力紧固式钢管混凝土矩形柱。如附图1、2所示，首先将矩形的钢筋混凝土柱1外表面进行检查和修整，将表面打磨、清理平整，按设计要求在钢筋混凝土柱1上钻孔、植钢筋；植入的钢筋直径为16～25mm，植入深度为160～250mm，钢筋头露出钢筋混凝土柱1的表面30～40mm，并对植筋位置分别给8块紧固钢板开孔，孔径应大于植筋直径，以利调整钢板位置。8块紧固钢板(钢筋混凝土柱1四角的4块角钢状钢板2和中间的4块矩形钢板3，角钢状钢板2是L形的等肢角钢型截面，矩形钢板3为一字型截面)沿钢筋混凝土柱1的高度方向分若干段，每段1～2m，在每一段的每个表面有两条竖直缝，竖直缝之间设有扭剪型高强螺栓支托架4，在扭剪型高强螺栓支托架4上穿有扭剪型高强螺栓5。分段在钢筋混凝土柱1表面涂刷耐高温结构胶，按植筋位置分别对应挂上8块紧固钢板。将扭剪型高强螺栓支托架4上的扭剪型高强螺栓5拧紧(梅花头剪断即拧紧)，使8块紧固钢板横向产生预拉力P(如图3所示)，预拉力P的合力P1＝2×1414P＝2.828P，由柱四角作用于原钢筋混凝土柱1上，根据作用力等于反作用力原理(如图3所示，P1＝P′1)，则P′1的合力P2＝2×2.828P＝5.656P反作用于紧固钢板内侧面，亦钢筋混凝土柱1表面与紧固钢板内表面之间产生正压力，这是确保紧固钢板与钢筋混凝土柱1共同工作的剪力(Nv＝αRημP)来源，然后将钢板的所有接缝采用坡口对焊，使所有钢板连为封闭整体，分别将植筋头钢筋与钢板围焊焊牢；然后在矩形钢板3的外表层点焊钢丝网片，并刷加防火粉的高标号水泥防火砂浆即可，防火砂浆的厚度按防火等级确定。Embodiment 1 of the present invention: outsourcing prestressed fastening type steel tube concrete rectangular column. As shown in accompanying drawings 1 and 2, at first the outer surface of the rectangular reinforced concrete column 1 is inspected and repaired, the surface is polished, cleaned and leveled, and holes are drilled and steel bars are planted on the reinforced concrete column 1 according to the design requirements; the implanted steel bars The diameter is 16-25mm, the implantation depth is 160-250mm, the steel bar head is exposed to the surface of the reinforced concrete column 1 by 30-40mm, and 8 fastening steel plates are respectively opened for the positions of the planted bars. Adjust the position of the steel plate. 8 fastening steel plates (four angle steel plates 2 at the four corners of the reinforced concrete column 1 and four rectangular steel plates 3 in the middle, the angle steel plates 2 are L-shaped equal-leg angle steel sections, and the rectangular steel plates 3 are straight-shaped cross sections) Along the height direction of the reinforced concrete column 1, it is divided into several sections, each section is 1-2m, and there are two vertical joints on each surface of each section, and torsional shear type high-strength bolt brackets 4 are arranged between the vertical joints. The torsional shear type high strength bolt support bracket 4 is worn with the torsional shear type high strength bolt 5 . Apply high-temperature-resistant structural adhesive to the surface of reinforced concrete column 1 in sections, and hang 8 fastening steel plates corresponding to the positions of the planting bars. Tighten the torsion-shear type high-strength bolts 5 on the torsion-shear type high-strength bolt support bracket 4 (the torx head is cut and tightened), so that the eight fastening steel plates generate a pre-tension force P horizontally (as shown in Figure 3), and the pre-tension force P The resultant force P 1 =2×1414P=2.828P acts on the original reinforced concrete column 1 from the four corners of the column. According to the principle that the action force is equal to the reaction force (as shown in Figure 3, P 1 =P′ 1 ), then the P′ 1 The resultant force P 2 =2×2.828P=5.656P reacts on the inner surface of the fastening steel plate, and produces a positive pressure between the surface of the reinforced concrete column 1 and the inner surface of the fastening steel plate, which ensures that the fastening steel plate and the reinforced concrete column 1 work together The source of the shear force (N v = α R ημP), and then all the seams of the steel plates are grooved butt welded, so that all the steel plates are connected as a closed whole, and the steel bars of the planting head and the steel plates are welded firmly; then in the rectangular The outer layer of the steel plate 3 is spot-welded with steel wire mesh, and brushed with high-grade cement fireproof mortar with fireproof powder. The thickness of the fireproof mortar is determined according to the fireproof grade.

本发明实施例2：外包预应力紧固式钢管混凝土圆柱。如附图4、5所示，首先将圆形的钢筋混凝土柱1外表面进行检查和修整，将表面打磨、清理平整；按设计要求在钢筋混凝土柱1上钻孔、植钢筋；植入的钢筋直径为16～25mm，植入深度为160～250mm，钢筋头露出钢筋混凝土柱1的表面30～40mm，并对植筋位置分别给4块(D≤800mm)或8块(D＞800mm)圆弧状截面钢板6(圆弧状截面的钢板6是1/4圆弧形或1/8圆弧形截面)开孔，孔径应大于植筋直径，以利调整钢板位置。4块或8块圆弧状截面钢板6沿钢筋混凝土柱1的高度方向分若干段，每段1～2m。在钢筋混凝土柱1表面涂耐高温结构胶后，马上分段挂上圆弧状截面钢板6，在扭剪型高强螺栓支托架4上穿有扭剪型高强螺栓5。拧紧扭剪型高强螺栓5，使圆弧状截面钢板6环向产生预拉力

Figure G20081U0187120080123D000041
，预拉力
Figure G20081U0187120080123D000042
使圆弧状截面钢板6对钢筋混凝土柱1表面产生预压力，如图5所示，即钢筋混凝土柱1表面与圆弧状截面钢板6之间产生正压应力，从而保证圆弧状截面钢板6与钢筋混凝土柱1表面传递剪应力而共同工作。当扭剪型高强螺栓5达到设计要求的紧固力时，梅花头处被剪断，亦达到紧固产生的横向预拉力，整个圆周长在预拉力作用下对圆形的钢筋混凝土柱1表面产生反作用力，根据作用力等于反作用力原理，则钢筋混凝土柱1表面对圆弧状截面钢板6内侧产生反作用应力
Figure G20081U0187120080123D000043
，如图5所示，从而形成自平衡结构体系。分段将植筋头钢筋与圆弧状截面钢板6塞焊焊牢，然后将圆弧状截面钢板6的所有接缝采用坡口对焊，使所有圆弧状截面钢板6连为封闭整体，在植筋头和扭剪型高强螺栓支托架4上固定钢丝网片，将掺有防火粉的高标号水泥防火砂浆分层抹上，防火砂浆厚度由结构防火等级确定。Embodiment 2 of the present invention: outsourcing prestressed fastening type steel tube concrete cylinder. As shown in accompanying drawing 4, 5, at first the outer surface of circular reinforced concrete column 1 is checked and repaired, and the surface is polished and cleaned up; drill holes and plant steel bars on reinforced concrete column 1 according to the design requirements; implanted The diameter of the steel bar is 16-25mm, the implantation depth is 160-250mm, the steel bar head is exposed to the surface of the reinforced concrete column 1 by 30-40mm, and 4 pieces (D≤800mm) or 8 pieces (D>800mm) are provided for the position of the reinforcement respectively. Arc-shaped cross-section steel plate 6 (the steel plate 6 of arc-shaped cross-section is 1/4 arc-shaped or 1/8 arc-shaped cross-section) is perforated, and the aperture should be greater than the planting bar diameter, in order to adjust the position of the steel plate. 4 or 8 arc-shaped cross-section steel plates 6 are divided into several sections along the height direction of the reinforced concrete column 1, each section is 1-2m. After the surface of the reinforced concrete column 1 is coated with high-temperature-resistant structural glue, the arc-shaped cross-section steel plate 6 is hung up in sections immediately, and the high-strength bolt 5 of the torsional shear type is worn on the support bracket 4 of the high-strength bolt of the torsional shear type. Tighten the high-strength torsional shear bolt 5 to make the arc-shaped cross-section steel plate 6 circumferentially generate pre-tension
Figure G20081U0187120080123D000041
, pretension
Figure G20081U0187120080123D000042
Make the arc-shaped cross-section steel plate 6 produce a preload on the surface of the reinforced concrete column 1, as shown in Figure 5, that is, a positive compressive stress is generated between the surface of the reinforced concrete column 1 and the arc-shaped cross-section steel plate 6, thereby ensuring that the arc-shaped cross-section steel plate 6 and the reinforced concrete column 1 surface to transfer shear stress and work together. When the torsion-shear type high-strength bolt 5 reaches the fastening force required by the design, the plum blossom head is cut off, and the transverse pre-tension force generated by the fastening is also reached. Reaction force, according to the principle that the action force is equal to the reaction force, the surface of the reinforced concrete column 1 produces a reaction stress on the inner side of the arc-shaped cross-section steel plate 6
Figure G20081U0187120080123D000043
, as shown in Figure 5, thus forming a self-balancing structural system. Weld the steel bars of the planting head with the arc-shaped cross-section steel plate 6 in sections, and then weld all the seams of the arc-shaped cross-section steel plate 6 with groove butt welding, so that all the arc-shaped cross-section steel plates 6 are connected as a closed whole, Fix the steel wire mesh sheet on the reinforcement head and the torsional shear type high-strength bolt bracket 4, and spread the high-grade cement fireproof mortar mixed with fireproof powder layer by layer. The thickness of the fireproof mortar is determined by the fireproof grade of the structure.

Claims (7)

1. the method that enveloping prestressing force fastening type steel tube concrete column is reinforced is characterized in that, may further comprise the steps:
(1) original reinforced concrete post is checked and repaired, surface finish, cleaning is smooth;
(2) on reinforced concrete post, hole, implant reinforcing bar; The diameter of implanting reinforcing bar is 16～25mm, and implantation depth is 160～250mm;
(3) at the surface brush high-temperature resistant structural adhesive of reinforced concrete post, in the surface segment outsourcing of the reinforced concrete post steel plate of perforate, the steel plate aperture is greater than the bar planting diameter then, and surface of steel plate 20～40mm is exposed in bar planting;
(4) on the bolt pernetti of steel plate, penetrate the torque-shear type high-strength bolt; Tighten the torque-shear type high-strength bolt; Make steel plate laterally set up pretension; And utilize active force to equate with reaction force that principle makes between torque-shear type high-strength bolt and the steel plate to produce normal pressure, thereby have the frictional force of shear behavior, make steel plate be close to the reinforced concrete post surface;
(5) all seams with steel plate adopt the groove butt welding, make all steel plates be linked as sealing integral body;
(6) respectively a bar planting reinforcing bar and steel plate weld all around are welded; Then the outsourcing high grade and mix the fire prevention powder ferro-cement.
2. enveloping prestressing force fastening type steel tube concrete rectangular column; The reinforced concrete post (1) that comprises rectangle; It is characterized in that: four jiaos of external surfaces at each section of reinforced concrete post (1) of rectangle are surrounded by 4 blocks of angle steel shape steel plates (2), and the rectangular steel plates (3) with height such as angle steel shape steel plate (2) grade is housed between angle steel shape steel plate (2); Two vertically seams are arranged on each surface of each section of reinforced concrete post (1); Vertically be provided with torque-shear type high-strength bolt pernetti (4) between the seam; On torque-shear type high-strength bolt pernetti (4), be installed with torque-shear type high-strength bolt (5); Angle steel shape steel plate (2) of each section and rectangular steel plates (3) have the hole by the bar planting position of reinforced concrete post (1); And hang over rectangle reinforced concrete post (1) surface through this hole, be connected to one with torque-shear type high-strength bolt (5) between rectangular steel plates (3) and the angle steel shape steel plate (2).
3. enveloping prestressing force fastening type steel tube concrete rectangular column according to claim 2 is characterized in that: described angle steel shape steel plate (2) is L shaped angle with equal legs type cross section, and rectangular steel plates (3) is the yi word pattern cross section.
4. enveloping prestressing force fastening type steel tube concrete rectangular column according to claim 2 is characterized in that: the extexine point in rectangular steel plates (3) is welded with steel fabric sheet, and is brushed with the high-mark cement fireproof mortar that adds the powder of preventing fires.
5. enveloping prestressing force fastening type steel tube concrete cylindrical; Comprise circular reinforced concrete post (1); It is characterized in that: be glued with 4～8 blocks of circular-arc cross section steel plates (6) in the surperficial size of the reinforced concrete post (1) of circle according to column diameter; Circular-arc cross section steel plate (6) is a plurality of sections according to the post high score; Be provided with torque-shear type high-strength bolt pernetti (4) in the seam crossing end, on torque-shear type high-strength bolt pernetti (4), be installed with torque-shear type high-strength bolt (5), the circular-arc cross section steel plate (6) of each section has the hole by the bar planting position of reinforced concrete post (1); And hang over reinforced concrete post (1) surface through this hole, be connected to one through torque-shear type high-strength bolt (5) between the circular-arc cross section steel plate (6).
6. enveloping prestressing force fastening type steel tube concrete cylindrical according to claim 5 is characterized in that: described circular-arc cross section steel plate (6) is 1/4 circular arc or 1/8 circular section.
7. enveloping prestressing force fastening type steel tube concrete cylindrical according to claim 5; It is characterized in that: the extexine point of steel plate (6) is welded with steel fabric sheet in circular-arc cross section; And being brushed with the high-mark cement fireproof mortar that adds the powder of preventing fires, its thickness is confirmed by fire-protection rating.
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