CN110375611A - A kind of method that can accurately measure the longitudinal and circumferential thickness that comes to nothing of concrete filled steel tube - Google Patents
A kind of method that can accurately measure the longitudinal and circumferential thickness that comes to nothing of concrete filled steel tube Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 88
- 239000010959 steel Substances 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 29
- 241000587161 Gomphocarpus Species 0.000 claims abstract description 43
- 239000011800 void material Substances 0.000 claims abstract description 43
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 239000002985 plastic film Substances 0.000 claims description 9
- 229920006255 plastic film Polymers 0.000 claims description 9
- 239000011241 protective layer Substances 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004132 cross linking Methods 0.000 claims description 2
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- 238000001514 detection method Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
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- 238000009527 percussion Methods 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
- G01B5/06—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness for measuring thickness
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Abstract
本发明提供了一种可准确测量钢管混凝土纵向和环向脱空厚度的方法，该检测方法基于千分表准确测量钢管混凝土环向脱空和纵向脱空厚度。通过测量垂直插入钢管混凝土且朝向钢管混凝土中心的钉头的位移来确定钢管混凝土的脱空厚度。本发明所述测量钢管混凝土脱空厚度的检测装置可准确测量钢管混凝土的环向脱空和纵向脱空，为钢管混凝土脱空的修补提供准确依据。
The invention provides a method capable of accurately measuring the longitudinal and circumferential void thicknesses of the steel pipe concrete, and the detection method is based on a dial indicator to accurately measure the circumferential void thickness and the longitudinal void thickness of the steel pipe concrete. The void thickness of the CFST was determined by measuring the displacement of the nail head inserted vertically into the CFST and towards the center of the CFST. The detection device for measuring the void thickness of the concrete-filled steel pipe concrete can accurately measure the circumferential void and the longitudinal void of the concrete-filled steel pipe concrete, and provide accurate basis for repairing the void of the concrete-filled steel pipe.
Description
技术领域technical field
本发明涉及一种钢管混凝土脱空检测方法，尤其是一种基于千分表准确测试钢管混凝土脱空厚度的方法。The invention relates to a method for detecting voids of steel pipe concrete, in particular to a method for accurately testing the thickness of steel pipe concrete voids based on a dial gauge.
背景技术Background technique
近年来，钢管混凝土因其承载力强、抗震性好、施工方便、经济性强等优点得到了广泛的研究和应用，特别是在超高层建筑和大跨度桥梁中的得到了大量的应用。钢管与混凝土相辅相成，一方面钢管提供套箍作用，核心混凝土处于三向受压状态，提高了其抗压强度；另一方面核心混凝土为钢管提供支撑作用，改善了钢管屈曲、失稳问题。In recent years, CFST has been widely researched and applied due to its strong bearing capacity, good earthquake resistance, convenient construction, and strong economy, especially in super high-rise buildings and long-span bridges. The steel pipe and the concrete complement each other. On the one hand, the steel pipe provides the hoop function, and the core concrete is in a three-dimensional compression state, which improves its compressive strength; on the other hand, the core concrete provides support for the steel pipe, which improves the buckling and instability of the steel pipe.
但是在大量的应用中发现，钢管混凝土易在施工、混凝土收缩、温度变化等因素下作用导致脱空。脱空使得钢管混凝土的套箍作用消失，从而导致钢管混凝承载能力、刚度等显著降低，影响到钢管混凝土结果的耐久性和安全性。因此准确测定钢管混凝土的脱空厚度并采取有效补救措施具有重要意义。However, it has been found in a large number of applications that concrete filled steel tubes are prone to voiding due to factors such as construction, concrete shrinkage, and temperature changes. The void makes the hoop effect of the concrete filled steel tube disappear, which leads to a significant reduction in the bearing capacity and stiffness of the concrete filled steel tube concrete, which affects the durability and safety of the concrete filled steel tube concrete. Therefore, it is of great significance to accurately measure the void thickness of CFST and take effective remedial measures.
现有的钢管混凝土脱空检测方法主要为敲击法、瞬态冲击法和压电陶瓷检测方法，该系列方法均是根据冲击响应推测是否脱空，并不能准确测量脱空厚度。而根据脱空厚度不同，将需要采取不同的修复方法。当采用二次灌浆修复以后，大脱空现象转变为脱粘情况，文献中提供了一种非线性振动识别脱粘的方法，但其成本高，操作复杂。The existing void detection methods for concrete filled steel tubes are mainly percussion method, transient impact method and piezoelectric ceramic detection method. These series of methods are based on the impact response to infer whether the void is void, and cannot accurately measure the void thickness. Depending on the thickness of the void, different repair methods will be required. When the secondary grouting is used for repair, the large void phenomenon turns into a debonding situation. The literature provides a method for non-linear vibration identification of debonding, but its cost is high and the operation is complicated.
发明内容Contents of the invention
技术问题：本发明提供了一种可准确测量钢管混凝土纵向和环向脱空厚度的方法，该方法基于千分表准确测量钢管混凝土脱空厚度，可准确测量钢管混凝土的环向脱空和纵向脱空, 为钢管混凝土脱空的修补提供准确依据。Technical problem: The present invention provides a method that can accurately measure the longitudinal and circumferential void thickness of steel-filled steel tube concrete. It provides an accurate basis for the repair of voids in concrete filled steel tubes.
技术方案：本发明的一种可准确测量钢管混凝土纵向和环向脱空厚度的方法，通过测量垂直插入钢管混凝土且朝向钢管混凝土中心的钉头的位移来确定钢管混凝土的脱空厚度；Technical solution: A method of the present invention that can accurately measure the longitudinal and circumferential void thickness of CFST, by measuring the displacement of the nail head vertically inserted into the CFST and facing the center of the CFST to determine the void thickness of the CFST;
测量钢管混凝土(5)纵向和环向脱空厚度的装置包括钉头(4)，连杆或滑杆(2)，电磁继电器(1)和千分表(3)；The device for measuring the longitudinal and circumferential void thickness of the steel tube concrete (5) includes a nail head (4), a connecting rod or a sliding rod (2), an electromagnetic relay (1) and a dial gauge (3);
测量钢管混凝土纵向和环向脱空厚度的方法为：The method for measuring the longitudinal and circumferential hollow thickness of steel pipe concrete is as follows:
步骤1，将钢管混凝土的钢管上留一小孔，钉头采用塑性薄膜固定在小孔中心位置或自混凝土凝固前从小孔插入混凝土中；Step 1: leave a small hole on the steel pipe of the concrete-filled steel tube, and fix the nail head at the center of the small hole with a plastic film or insert it into the concrete from the small hole before the concrete solidifies;
步骤2，将千分表与钉头接触，测量钉头位移，且二者中心线重合；Step 2, contact the dial indicator with the nail head, measure the displacement of the nail head, and the centerlines of the two coincide;
步骤3，所述连杆由两根杆组成，两根杆相铰接，其中一根杆的底部与千分表的触头固定连接，另一根杆的底部连接电磁继电器，电磁继电器固定在钢管的外侧；当钢管混凝土发生脱空时，千分表的读数即发生变化，可计算出钢管混凝土脱空的厚度；Step 3, the connecting rod is composed of two rods, the two rods are hinged, the bottom of one rod is fixedly connected to the contact of the dial indicator, and the bottom of the other rod is connected to the electromagnetic relay, and the electromagnetic relay is fixed on the steel pipe When the concrete filled steel tube is voided, the reading of the dial gauge changes, and the thickness of the hollowed out concrete filled steel tube can be calculated;
所述千分表的负读数表示混凝土与钢管表面脱离距离。The negative reading of the dial gauge indicates the separation distance between the concrete and the steel pipe surface.
其中，in,
所述连杆可由滑杆代替，所述滑杆的一端与钉头转动连接，另一端与电磁继电器套接，当钢管混凝土发生脱空，钉头即发生位移，滑杆与电磁继电器交联的角度，以及滑杆两端的长度发生变化，通过长度变化和角度计算出钢管混凝土脱空的厚度。The connecting rod can be replaced by a sliding rod. One end of the sliding rod is rotatably connected with the nail head, and the other end is socketed with the electromagnetic relay. Angle, and the length of both ends of the slide bar changes, and the thickness of the concrete filled steel tube void is calculated through the length change and angle.
所述电磁继电器与钢管接触的表面采用弧形或“凹”字型，以确保电磁继电器在不同形状的钢管表面均可以稳固粘接。The surface of the electromagnetic relay in contact with the steel pipe adopts an arc or "concave" shape to ensure that the electromagnetic relay can be firmly bonded to the surface of steel pipes of different shapes.
所述小孔的直径为8-15mm。The diameter of the small hole is 8-15mm.
所述钉头伸出钢管外壁20-30mm，伸入钢管内壁20-40mm。The nail head protrudes from the outer wall of the steel pipe by 20-30mm, and extends into the inner wall of the steel pipe by 20-40mm.
所述钉头表面具有螺纹，以确保钉头与混凝土良好粘接。The surface of the nail head has threads to ensure good adhesion between the nail head and concrete.
所述钉头的表面、小孔周边，还设置有防护层，所述防护层为塑料薄膜。The surface of the nail head and the periphery of the small hole are also provided with a protective layer, and the protective layer is a plastic film.
有益效果：本发明所述测量钢管混凝土脱空厚度的检测装置可准确测量钢管混凝土的环向脱空和纵向脱空,为钢管混凝土脱空的修补提供准确依据。Beneficial effects: the detection device for measuring the void thickness of steel pipe concrete can accurately measure the circumferential void and longitudinal void of steel pipe concrete, and provide accurate basis for the repair of steel pipe concrete void.
附图说明Description of drawings
图1为本发明所述钢管混凝土脱空监测方法示意图一-连杆方式。Fig. 1 is a schematic diagram of the void monitoring method of concrete filled steel pipes according to the present invention - connecting rod mode.
图2为本发明所述钢管混凝土脱空监测方法滑杆方式的初始位置示意图。Fig. 2 is a schematic diagram of the initial position of the slide bar method of the emptying monitoring method for concrete filled steel pipes according to the present invention.
图3为本发明所述钢管混凝土脱空监测方法滑杆方式的测量位置示意图。Fig. 3 is a schematic diagram of the measurement position of the sliding bar method of the hollow monitoring method of the concrete filled steel pipe concrete according to the present invention.
其中有：电磁继电器1，连杆或滑杆2，千分表3，钉头4，钢管混凝土5。Among them are: electromagnetic relay 1, connecting rod or sliding rod 2, dial indicator 3, nail head 4, steel pipe concrete 5.
初始长度L，试验长度L1，钢管混凝土柱长度H，滑杆转动角度θ，环向脱空厚度d，纵向脱空厚度h。The initial length L, the test length L1, the length H of the concrete filled steel tube column, the rotation angle θ of the slide bar, the thickness d of the hoop void, and the thickness h of the longitudinal void.
具体实施方式Detailed ways
所述测量钢管混凝土脱空厚度的检测装置，由垂直插入钢管混凝土且朝向钢管混凝土中心的钉头的位移来确定钢管混凝土的脱空厚度。The detection device for measuring the void thickness of the concrete filled steel tube concrete determines the void thickness of the concrete filled steel tube concrete by the displacement of the nail head vertically inserted into the concrete filled steel tube concrete and towards the center of the concrete filled steel tube concrete.
所述测量钢管混凝土脱空厚度的检测装置，由钉头，连杆或滑杆，电磁继电器和千分表组成；The detection device for measuring the hollow thickness of the steel pipe concrete is composed of a nail head, a connecting rod or a sliding rod, an electromagnetic relay and a dial indicator;
所述钢管混凝土的钢管上留一小孔，钉头自混凝土凝固前从小孔插入混凝土中。A small hole is left on the steel pipe of the steel pipe concrete, and the nail head is inserted into the concrete from the small hole before the concrete is solidified.
所述电磁继电器与钢管接触的表面采用弧形或“凹”字型，以确保电磁继电器在不同形状的钢管表面均可以稳固粘接。The surface of the electromagnetic relay in contact with the steel pipe adopts an arc or "concave" shape to ensure that the electromagnetic relay can be firmly bonded to the surface of steel pipes of different shapes.
所述千分表与钉头接触，测量钉头位移，且二者中心线重合。所述千分表的负读数表示混凝土与钢管表面脱离距离。The dial indicator is in contact with the nail head to measure the displacement of the nail head, and the center lines of the two coincide. The negative reading of the dial gauge indicates the separation distance between the concrete and the steel pipe surface.
所述连杆由两根杆组成，两根杆转动连接，其中一根杆的底部与千分表固定连接，另一根杆的底部连接电磁继电器。当钢管混凝土发生脱空时，千分表的读数即发生变化，可计算出钢管混凝土脱空的厚度。The connecting rod is composed of two rods, which are rotationally connected, wherein the bottom of one rod is fixedly connected with the dial indicator, and the bottom of the other rod is connected with the electromagnetic relay. When the concrete filled steel tube is hollowed out, the reading of the dial gauge changes, and the thickness of the hollowed out concrete filled steel tube concrete can be calculated.
所述滑杆一端与钉头转动连接，另一端与电磁继电器套接，当钢管混凝土发生脱空，钉头即发生位移，滑杆与电磁继电器交联的角度，以及滑杆两端的长度发生变化，通过长度变化和角度计算出钢管混凝土纵向和环向脱空的厚度。One end of the slide bar is connected to the nail head in rotation, and the other end is socketed with the electromagnetic relay. When the concrete filled steel tube is hollowed out, the nail head is displaced, and the cross-linking angle between the slide bar and the electromagnetic relay, as well as the length of both ends of the slide bar change. , calculate the longitudinal and circumferential void thickness of CFST through the length change and angle.
所述小孔的直径为8-15mm；The diameter of the small hole is 8-15mm;
所述钉头伸出钢管外壁20-30mm，伸入内壁20-40mm。The nail head protrudes from the outer wall of the steel pipe by 20-30mm, and extends into the inner wall by 20-40mm.
所述钉头表面具有螺纹，以确保钉头与混凝土良好粘接。The surface of the nail head has threads to ensure good adhesion between the nail head and concrete.
所述测量钢管混凝土脱空厚度的检测装置中，所述钉头的表面，还设置有防护层，所述防护层为塑料薄膜。In the detection device for measuring void thickness of steel pipe concrete, the surface of the nail head is further provided with a protective layer, and the protective layer is a plastic film.
采用滑杆的方式，重点在于钉头和连杆之间的铰接，角度准确测量。并且采用这种方法，不仅能考虑脱空(混凝土环向收缩)，还能考虑到垂直于钉头方向的混凝土收缩/膨胀变形。如果仅纵向混凝土收缩，所测钉头位置下移，则L1的值就会变大，而角度θ并无变化。因此采用这种方法不仅能测量环向收缩，还可以测量纵向收缩。Using the sliding rod method, the focus is on the hinge between the nail head and the connecting rod, and the angle is accurately measured. And with this method, not only the void (concrete shrinkage in the circumferential direction) but also the concrete shrinkage/expansion deformation perpendicular to the direction of the nail head can be considered. If only the longitudinal concrete shrinks and the position of the measured nail head moves down, the value of L1 will become larger, but the angle θ will not change. Therefore, using this method not only the circumferential shrinkage can be measured, but also the longitudinal shrinkage can be measured.
所测环向脱空厚度d＝L1×sinθ。The measured annular void thickness d=L 1 ×sinθ.
所测纵向脱空率v＝(L1×cosθ)/L。The measured longitudinal void rate v=(L 1 ×cosθ)/L.
所测纵向脱空厚度h＝v×H。The measured longitudinal void thickness h=v×H.
实施例1：Example 1:
1.在准备浇筑混凝土的钢管壁上开一个直径为8-15mm的小孔，开孔反向朝向钢管圆心处。1. Open a small hole with a diameter of 8-15mm on the wall of the steel pipe to be poured, and the hole is reversed to the center of the steel pipe.
2.将钉头放置在所开小孔处，采用塑料薄膜固定，并用薄膜将所开小孔堵住，钉头伸出钢管外壁20-30mm，伸入内壁20-40mm。2. Place the nail head at the small hole, fix it with a plastic film, and block the small hole with the film. The nail head protrudes 20-30mm from the outer wall of the steel pipe and 20-40mm into the inner wall.
3.浇筑混凝土，待混凝土终凝后，拆除塑料薄膜。3. Pour concrete, and remove the plastic film after the concrete has finally set.
4.打开电磁继电器开关，将其固定在钢管表面，调节两根连杆，保证千分表与钉头中心线重合，调节千分表读数在0.5000mm左右。4. Turn on the electromagnetic relay switch, fix it on the surface of the steel pipe, adjust the two connecting rods to ensure that the dial gauge coincides with the center line of the nail head, and adjust the dial gauge reading to about 0.5000mm.
5.安装完毕，并在规定时间点读取千分表读数。5. After the installation is complete, read the reading of the dial indicator at the specified time point.
实施例2：Example 2:
1.在准备浇筑混凝土的钢管壁上开一个直径为8-15mm的小孔，开孔反向朝向钢管圆心处。1. Open a small hole with a diameter of 8-15mm on the wall of the steel pipe to be poured, and the hole is reversed to the center of the steel pipe.
2.将钉头放置在所开小孔处，采用塑料薄膜固定，并用薄膜将所开小孔堵住，钉头伸出钢管外壁20-30mm，伸入内壁20-40mm。2. Place the nail head at the small hole, fix it with a plastic film, and block the small hole with the film. The nail head protrudes 20-30mm from the outer wall of the steel pipe and 20-40mm into the inner wall.
3.浇筑混凝土，待混凝土终凝后，拆除塑料薄膜。3. Pour concrete, and remove the plastic film after the concrete has finally set.
4.打开电磁继电器开关，将其固定在钢管表面，调节滑杆位置，滑杆中间位置与电磁继电器点接触，一端与钉头末端铰接，保证滑杆与钢管中心轴线平行，并采用游标卡尺测量滑杆铰接端点至电磁继电器接触点的初始距离L。4. Turn on the electromagnetic relay switch, fix it on the surface of the steel pipe, adjust the position of the slide bar, the middle position of the slide bar is in contact with the electromagnetic relay, and one end is hinged with the end of the nail head to ensure that the slide bar is parallel to the central axis of the steel pipe, and use a vernier caliper to measure the slide bar. The initial distance L from the hinged end of the rod to the contact point of the electromagnetic relay.
5.安装完毕，并在规定时间点测量L1和θ。5. After the installation is complete, measure L 1 and θ at the specified time point.
6.所测环向脱空厚度d＝L1×sinθ。6. The measured circumferential void thickness d=L 1 ×sinθ.
7.所测纵向率v＝(L1×cosθ)/L。7. The measured longitudinal ratio v=(L 1 ×cosθ)/L.
8.所测纵向脱空厚度h＝v×H。8. The measured longitudinal void thickness h=v×H.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| JP2000206016A (en) * | 1999-01-12 | 2000-07-28 | Daiwa House Ind Co Ltd | Method and apparatus for manufacturing concrete specimen for estimation of strength of filled concrete in cft pillar |
| CN202735169U (en) * | 2012-08-03 | 2013-02-13 | 中建商品混凝土有限公司 | Device for testing shrinkage of concrete filled steel tubular under effect of vertical load |
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| CN106092036A (en) * | 2016-06-03 | 2016-11-09 | 北京工业职业技术学院 | A kind of formwork-support deformation remote real time monitoring system and method |
| CN108254440A (en) * | 2018-02-01 | 2018-07-06 | 湖南大学 | It is a kind of to detect robot and the method using detection robot detection concrete filled steel tube pouring quality |
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Application publication date: 20191025 |