阅读说明：本技术 一种混凝土梁板浇筑过程中监测裂缝的方法 (Method for monitoring cracks in concrete beam plate pouring process ) 是由 李家深 柯利佳 赵跃 于 2021-08-16 设计创作，主要内容包括：本发明公开了一种混凝土梁板浇筑过程中监测裂缝的方法,包括监测设备,所述监测设备包括承载块,所述承载块的上端设有放置槽,所述放置槽内的顶部设有两个相互平行的滑槽,所述滑槽内均安装有滑块,且同一侧的两个滑块为一组,同一组的两个滑块之间共同固定有横杆,且横杆位于放置槽内,两个横杆上共同设有动力装置,所述滑块的上端转动连接有转动杆,四个转动杆的上端共同转动连接有隔板,所述隔板的上端设有声发射监测器。本发明实现了在混凝土浇筑工程中快速精准的找到混凝土中存在的裂缝,从而方便工作人员进行处理,有效的保证工程质量,加快工程进度,保证混凝土结构的整体性和安全性。(The invention discloses a method for monitoring cracks in a concrete beam slab pouring process, which comprises monitoring equipment, wherein the monitoring equipment comprises a bearing block, a placing groove is formed in the upper end of the bearing block, two parallel sliding grooves are formed in the top of the placing groove, sliding blocks are arranged in the sliding grooves, the two sliding blocks on the same side are in a group, a cross rod is fixed between the two sliding blocks in the same group and is positioned in the placing groove, a power device is arranged on the two cross rods, the upper ends of the sliding blocks are rotatably connected with rotating rods, the upper ends of the four rotating rods are rotatably connected with a partition board, and an acoustic emission monitor is arranged at the upper end of the partition board. The method and the device realize the rapid and accurate finding of the cracks in the concrete pouring engineering, thereby facilitating the treatment of workers, effectively ensuring the engineering quality, accelerating the engineering progress and ensuring the integrity and the safety of the concrete structure.)

1. A method for monitoring cracks in a concrete beam slab pouring process is characterized by comprising the following steps: including monitoring facilities, monitoring facilities includes carrier block (8), the upper end of carrier block (8) is equipped with standing groove (18), top in standing groove (18) is equipped with two spout (15) that are parallel to each other, all install slider (13) in spout (15), and with two slider (13) of one side be a set of, be fixed with horizontal pole (16) jointly between two slider (13) of same set of, and horizontal pole (16) are located standing groove (18), are equipped with power device jointly on two horizontal poles (16), the upper end of slider (13) is rotated and is connected with dwang (11), and the upper end of four dwang (11) is rotated jointly and is connected with baffle (9), the upper end of baffle (9) is equipped with acoustic emission monitor (6), the cracked method of monitoring includes following step:

s1, building the building template (1) into a required beam slab pattern, and weaving the structural steel bars (4), so that the quality of the concrete after casting can be guaranteed;

s2, before concrete pouring, the acoustic emission sensors (3) are packaged by epoxy resin for waterproof treatment, after the waterproof treatment, the acoustic emission sensors (3) are pasted on the side surfaces of the structural steel bars (4) by resin, a plurality of acoustic emission sensors (3) are pasted uniformly, and the distance between every two adjacent acoustic emission sensors (3) is 1-2 m;

s3, one side of each acoustic emission sensor (3) is provided with a coaxial shielded cable (5) for connection, and one end of each coaxial shielded cable (5) is connected to the acoustic emission monitor (6);

s4, pouring through a pouring device, wherein the acoustic emission sensor (3) is embedded in concrete, and in the pouring process, the acoustic emission sensor (3) sends a signal to the acoustic emission monitor (6), and the acoustic emission monitor (6) is used for recording and analyzing acoustic emission source information;

s5, cracks existing in the pouring process can be quickly found and positioned through analysis of the acoustic emission monitor (6), and the cracks are quickly processed to ensure the pouring quality.

2. The method for monitoring cracks in the concrete beam slab pouring process according to claim 1, wherein the power device comprises a threaded rod (12) penetrating through two cross rods (16), a forward thread and a reverse thread are respectively arranged at two ends of the threaded rod (12), one cross rod (16) is in threaded sleeve connection with one end, provided with the reverse thread, of the threaded rod (12), the other cross rod (16) is in threaded sleeve connection with one end, provided with the forward thread, of the threaded rod (12), one end of the threaded rod (12) is rotatably connected to one end side wall in the placing groove (18), the other end of the threaded rod (12) is fixed with a servo motor (14), and the servo motor (14) is fixed at the bottom in the placing groove (18).

3. The method for monitoring cracks in the concrete beam slab casting process according to claim 1, wherein a polish rod (17) is arranged on the two cross rods (16) in a penetrating mode, the two cross rods (16) are sleeved on the polish rod (17) in a sliding mode, the polish rod (17) is located on one side of the threaded rod (12), and two ends of the polish rod (17) are fixed on opposite side walls in the placing groove (18) respectively.

4. The method for monitoring cracks in the pouring process of the concrete beam slab as claimed in claim 1, wherein a cover plate (7) is hinged to one side of the upper end of the bearing block (8), and the cover plate (7) corresponds to the placing groove (18).

5. A method of monitoring cracks during the casting of concrete beam panels according to claim 1, characterized in that a bracket (10) is fixed to the lower end of the bearing block (8).

Technical Field

The invention relates to the technical field of concrete monitoring, in particular to a method for monitoring cracks in a concrete beam slab pouring process.

Background

Concrete is a bad heat conduction material, and for bulky concrete, inside heat is difficult for giving off, can form higher hydration heat temperature rise, in the cooling process, receives self restraint and external restraint because inhomogeneous cooling. Self-restraint is the mutual restraint of concrete inside the concrete, resulting in self-induced stress, and external restraint is the restraint from old concrete or foundations, resulting in restrained stress. Both the autogenous stress and the beam stress are temperature stresses resulting from a temperature change. With the continuous progress of construction technology and the use of novel materials, huge projects, super high-rise and other heavy projects have come into the sight of people, because large-volume concrete pouring is an important step in the construction process, but the temperature stress of large-volume concrete often exceeds the stress caused by external load, so that the structure generates temperature cracks. The generation of temperature cracks not only affects the bearing capacity and the design effect of the structure, but also has important influence on the safety and the durability of the structure. In the construction stage of the large-volume concrete, cracks are generated due to overlarge internal and external temperature difference caused by the release of hydration heat, and the obvious loss of the later strength of the concrete is caused due to overhigh hydration heat temperature. There are many examples of cracks occurring in mass concrete structures at home and abroad, which seriously affect the use of projects, so that remedial measures have to be taken, which is time-consuming, labor-consuming and expensive. The concrete expands or contracts with a change in temperature, and becomes temperature-deformed. For the construction stage of the large-volume concrete, the cracks caused by temperature deformation can become initial cracks or early cracks. Cracks appearing in mass concrete can be generally divided into surface cracks, deep cracks, through cracks and the like according to the depth of the cracks. The through cracks cut off the structural section, which may damage the structural integrity, durability and waterproofness, affect normal use and cause serious harm. The deep cracks partially cut off the structural section and have certain harmfulness. Although the surface crack does not belong to a structural crack, when the concrete shrinks, the fracture surface at the surface crack is weakened and concentrated stress is easily generated, so that the crack further develops.

How to carry out real-time and on-line monitoring on concrete in heavy projects, find and process problems as soon as possible and reduce potential safety hazards becomes a key and difficult problem in the current engineering field. The concrete structure cracks in the use process are a general phenomenon, the cracks expand to a certain width, water seepage, steel bar corrosion and other problems can be caused, the integrity and the safety of the concrete structure are directly damaged, the use of the project is seriously influenced, so that remedial measures have to be taken, time and labor are wasted, the cost is huge, the existing positioning technology monitors and positions after the concrete pouring is finished, the cracks cannot be found as soon as possible, the reworking, time and labor are wasted, the slow project progress is not facilitated, and the integrity and the safety of the project cannot be guaranteed.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a method for monitoring cracks in the concrete beam plate pouring process.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a concrete beam slab pours cracked method of in-process monitoring, includes monitoring facilities, monitoring facilities includes the carrier block, the upper end of carrier block is equipped with the standing groove, top in the standing groove is equipped with two spouts that are parallel to each other, all install the slider in the spout, and two sliders with one side are a set of, are fixed with the horizontal pole jointly between two sliders with the same set of, and the horizontal pole is located the standing groove, are equipped with power device jointly on two horizontal poles, the upper end of slider rotates and is connected with the dwang, and the upper end of four dwangs rotates jointly and is connected with the baffle, the upper end of baffle is equipped with the acoustic emission monitor, cracked method of monitoring includes following step:

s1, building the building template into a required beam slab pattern, and weaving the building template by using structural steel bars, so that the quality of the poured concrete can be ensured;

s2, before concrete pouring, the acoustic emission sensors are subjected to waterproof treatment through epoxy resin packaging, after the waterproof treatment, the acoustic emission sensors are pasted on the side faces of the structural steel bars through resin, a plurality of acoustic emission sensors are pasted evenly, and the distance between every two adjacent acoustic emission sensors is 1-2 m;

s3, one side of each acoustic emission sensor is provided with a coaxial shielded cable for connection, and one end of each coaxial shielded cable is connected to the acoustic emission monitor;

s4, pouring through the pouring device, wherein the acoustic emission sensor is embedded in the concrete, and in the pouring process, the acoustic emission sensor sends a signal to the acoustic emission monitor, and the acoustic emission monitor is used for recording and analyzing information of the acoustic emission source;

and S5, cracks existing in the pouring process can be quickly found and positioned through the analysis of the acoustic emission monitor, and the cracks are quickly processed to ensure the pouring quality. Preferably, power device is including running through the threaded rod that sets up on two horizontal poles, the both ends of threaded rod are equipped with forward screw thread and reverse threaded rod respectively, and one of them horizontal pole screw thread cup joints the one end that is equipped with reverse screw thread at the threaded rod, and another horizontal pole screw thread cup joints the one end that is equipped with forward screw thread at the threaded rod, the one end of threaded rod is rotated and is connected on the one end lateral wall in the standing groove, the other end of threaded rod is fixed with servo motor, and servo motor fixes the bottom in the standing groove. Preferably, two horizontal poles run through jointly and are equipped with the polished rod, and two horizontal poles slip cup joint on the polished rod, the polished rod is located one side of threaded rod, the both ends of polished rod are fixed respectively on the relative lateral wall in the standing groove. Preferably, one side of the upper end of the bearing block is hinged with a cover plate, and the cover plate corresponds to the placing groove. Preferably, a bracket is fixed at the lower end of the bearing block.

In the invention, when in use, the acoustic emission sensor is packaged by epoxy resin for waterproof treatment, after the treatment is finished, the acoustic emission sensor is pasted on the side surface of the structural steel bar by resin, the distance between the two acoustic emission sensors is 1-2m, the two acoustic emission sensors are pasted uniformly, after the pasting is finished, the concrete pouring device is used for pouring, the acoustic emission sensor is buried in a concrete structure as a large aggregate, the acoustic emission sensor is wrapped by the concrete and can receive acoustic waves in all directions, the signal amplitude is large, the first wave is obvious, the influence of the sound velocity on the positioning result is reduced, the aim of accurate positioning is achieved, the coaxial shielding cable transmits the signal emitted by the acoustic emission sensor to the acoustic emission monitor, the acoustic emission monitor records and analyzes the transmitted signal, whether cracks exist in the pouring project is conveniently and quickly found out, and the accurate positioning is carried out, so that the constructor can conveniently and quickly find the position and process the position, compared with the prior art, the invention has the beneficial effects that: 1. the sensor can effectively receive sound waves in all directions in the concrete pouring process, the signal amplitude is large, the head wave is obvious, the influence of the sound velocity on the positioning result is reduced, and the purpose of accurate positioning is achieved;

2. can make things convenient for the staff to find fast there is cracked position to take measures, the convenience just can effectually be handled at the source, guarantees concrete structure's integrality, improves concrete structure's wholeness and security.

The method is simple in structure and convenient to operate, and workers can find the cracks existing in the pouring engineering quickly and accurately, so that the cracks can be conveniently processed by the workers when pouring, the quality of concrete pouring is effectively improved, and the safety of the engineering is guaranteed.

Drawings

Fig. 1 is a schematic structural diagram of a method for monitoring cracks in a concrete beam slab pouring process according to the present invention; FIG. 2 is a schematic structural diagram of a bearing block of the apparatus for monitoring cracks during pouring of a concrete beam slab according to the present invention;

fig. 3 is a schematic view of an internal structure of a placing groove of the method for monitoring cracks in a concrete beam slab pouring process provided by the invention.

In the figure: 1 building template, 2 concrete, 3 acoustic emission sensors, 4 structural steel bars, 5 coaxial shielded cables, 6 acoustic emission monitors, 7 apron, 8 carrier blocks, 9 baffles, 10 supports, 11 dwang, 12 threaded rod, 13 sliders, 14 servo motor, 15 spouts, 16 horizontal pole, 17 polished rod, 18 standing groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-3, a method for monitoring cracks in a concrete beam slab pouring process comprises a monitoring device, wherein the monitoring device comprises a bearing block 8, a placing groove 18 is formed in the upper end of the bearing block 8, two parallel sliding grooves 15 are formed in the top of the placing groove 18, sliding blocks 13 are installed in the sliding grooves 15, the sliding blocks 13 move smoothly in the sliding grooves 15, the two sliding blocks 13 on the same side form a group, a cross rod 16 is fixed between the two sliding blocks 13 in the same group, the cross rod 16 enables the two sliding blocks 13 in the same group to move together, and the cross rod 16 is located in the placing groove 18, so that the sliding blocks 13 can be adjusted conveniently through the cross rod 16, and therefore, the height can be adjusted conveniently according to use requirements; be equipped with power device jointly on two horizontal poles 16, can provide power, the upper end of slider 13 is rotated and is connected with dwang 11, slider 13 removes and makes dwang 11 rotate, the common rotation in upper end of four dwang 11 is connected with baffle 9, dwang 11 rotates thereby to drive baffle 9 and rises or descend, the upper end of baffle 9 is equipped with acoustic emission monitor 6, conveniently connect and monitor, upper end one side of carrier block 8 articulates there is apron 7, and apron 7 and standing groove 18 are corresponding, use apron 7 to seal, prevent external influence, the lower extreme of carrier block 8 is fixed with support 10 and stably supports, conveniently adjust according to the user's demand, and can protect, prevent when not using, receive external influence, can not wet or fall grey etc., the cracked method of monitoring includes following step:

s1, the building template 1 is used for building, the building template 1 is built into a required beam slab pattern, so that pouring can be conveniently carried out according to design requirements, the structural steel bars 4 are used for weaving, the quality of the poured concrete can be guaranteed, the bonding anchoring effect between the structural steel bars 4 and the concrete can be ensured, the pouring quality of the concrete can be conveniently improved, and the safety of engineering can be improved;

s2, before concrete pouring, the acoustic emission sensor 3 is encapsulated by epoxy resin for waterproof treatment, the epoxy resin is a generic name of a polymer containing more than two epoxy groups in the molecule, and is a polycondensation product of epichlorohydrin and bisphenol A or polyalcohol, because of the chemical activity of the epoxy groups, a plurality of compounds containing active hydrogen can be used for ring opening, curing and crosslinking to generate a network structure, so the acoustic emission sensor is a thermosetting resin, the bisphenol A type epoxy resin not only has the maximum yield and the most complete variety, but also has the continuously increased new modified varieties and the continuously improved quality, the acoustic emission sensor 3 is encapsulated by the epoxy resin, can be effectively protected to prevent failure, the acoustic emission sensor 3 is embedded into the concrete, the acoustic emission sensor 3 is an important part of an acoustic emission detection system, and the acoustic emission sensor is a high-sensitivity acoustic emission sensor, after treatment, the acoustic emission sensors 3 are pasted on the side surfaces of the structural steel bars 4 by using resin, so that the acoustic emission sensors 3 are conveniently buried in a concrete structure as a large aggregate, a plurality of acoustic emission sensors 3 are uniformly pasted, the distance between every two adjacent acoustic emission sensors 3 is 1-2m, and mutual influence is avoided;

s3, one side of each acoustic emission sensor 3 is provided with a coaxial shielded cable 5 for connection, so that the acoustic emission sensors can normally transmit in an interference environment, and can protect equipment from being influenced, one end of each coaxial shielded cable 5 is connected to an acoustic emission monitor 6, and the acoustic emission monitor 6 is a PCI-2 system of American physical acoustics company;

s4, pouring by a pouring device, embedding the acoustic emission sensor 3 in the concrete, monitoring the crack of the concrete by adopting the embedded acoustic emission sensor, because the sensor is embedded in the concrete and is wrapped by the concrete, the sensor can receive acoustic waves in all directions, the signal amplitude is large, the first wave is obvious, the influence of the sound velocity on the positioning result is reduced, and the aim of accurate positioning is achieved, in the pouring process, the acoustic emission sensor 3 sends a signal to the acoustic emission monitor 6, the acoustic emission monitor 6 is used for recording and analyzing the information of the acoustic emission source, the crack of the concrete is simulated by a lead-breaking signal, the crack is positioned by the three-dimensional positioning function of PCI-2, after monitoring, the result of the simulated crack monitoring test is compared with the simulated crack monitoring result attached to the surface of the same test piece by using the same sensitivity sensor, and the positioning data is analyzed, in the monitoring result of the embedded acoustic emission sensor, the absolute coordinate error is reduced by 38.3%, the average standard deviation is reduced by 51.3%, the positioning accuracy of the embedded acoustic emission sensor is higher, the discreteness is small, and the positioning accuracy of a sound source is greatly improved;

s5, cracks existing in the pouring process can be quickly found and positioned through analysis of the acoustic emission monitor 6, and the cracks are quickly processed, so that the pouring quality is guaranteed, the condition of reworking is prevented, and the progress of engineering is guaranteed. In the invention, the power device comprises a threaded rod 12 penetrating through two transverse rods 16, a forward thread and a reverse threaded rod are respectively arranged at two ends of the threaded rod 12, one transverse rod 16 is sleeved at one end of the threaded rod 12 provided with the reverse thread, the other transverse rod 16 is sleeved at one end of the threaded rod 12 provided with the forward thread, the threaded rod 12 rotates to enable the two transverse rods 16 to move relatively or reversely, so that a sliding block 13 is moved, the position of a partition plate 9 is convenient to adjust, one end of the threaded rod 12 is rotatably connected to one end side wall in a placing groove 18, a servo motor 14 is fixed at the other end of the threaded rod 12, the servo motor 14 adopts an SGMVV-3GADB61 model, the servo motor 14 drives the threaded rod 12 to rotate, and the servo motor 14 is fixed at the bottom in the placing groove 18, so that the power device is stable and fixed, is convenient to adjust automatically and is convenient for a user to use. In the invention, the two cross rods 16 are provided with the polished rods 17 in a penetrating way, and the two cross rods 16 are sleeved on the polished rods 17 in a sliding way, so that the two cross rods 16 move along the direction of the polished rods 17, thereby enabling the cross rods 16 to move stably, the polished rods 17 are positioned at one side of the threaded rod 12, and two ends of the polished rods 17 are respectively fixed on opposite side walls in the placing grooves 18, so that the cross rods 16 move stably and are adjusted stably.

In the invention, when in use, the acoustic emission sensor 3 is subjected to waterproof treatment by epoxy resin packaging, after the treatment is finished, the acoustic emission sensor 3 is pasted on the side surface of the structural steel bar 4 by resin, the distance between the two acoustic emission sensors 3 is 1-2m, the acoustic emission sensors are uniformly pasted, after the pasting is finished, the concrete pouring device is used for pouring, the acoustic emission sensor 3 is buried in a concrete structure as a large aggregate, the acoustic emission sensor 3 is wrapped by concrete and can receive acoustic waves in all directions, the signal amplitude is large, the first wave is obvious, the influence of the sound velocity on a positioning result is reduced, the aim of accurate positioning is achieved, the coaxial shielding cable 5 transmits a signal sent by the acoustic emission sensor 3 to the acoustic emission monitor 6, the acoustic emission monitor 6 records and analyzes the transmitted signal, and whether cracks exist in the pouring project or not is conveniently and quickly found out, and the positioning is accurately carried out, so that the constructor can conveniently find the position and carry out processing.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical scope of the present invention and the equivalent alternatives or modifications according to the technical solution and the inventive concept of the present invention within the technical scope of the present invention.