Crack detection device for building concrete construction

Abstract

The invention discloses a crack detection device for building concrete construction, which comprises a cart, a crack pre-detector is mounted on a bottom plate of the cart, the crack pre-detector comprises a suspension bracket, an electromagnetic relay is mounted on the suspension bracket, an electromagnet is mounted at the center position of the electromagnetic relay, an integrated frame is arranged below the suspension bracket in parallel, and the integrated frame is connected with the integrated frame. An armature and a strong spring are mounted between the suspension bracket and the integrated frame; a plurality of crack wall breaking devices which are distributed in an array manner are mounted on the suspension bracket and the integrated frame; when the electromagnetic relay loses power, the strong spring drives the integrated frame and the limiting sliding pipe parts of the crack wall breaking devices to rapidly impact the concrete terrace; when the electromagnetic relay is powered on, the electromagnet attracts the armature, so that the integrated frame and the limiting sliding pipe parts of the crack wall breaking devices move upwards. According to the invention, the blind joint on the surface of the floor can be revealed through the crack wall breaking device, and the problem that the surface of the blind joint is intact and difficult to directly observe is solved, so that the construction period required by concrete crack detection is greatly shortened.

Description

Technical Field

[0001] The invention relates to the technical field of building engineering, and in particular to a crack detection device for building concrete construction. Background Art

[0002] Cracks in building concrete floors will reduce the strength and rigidity of concrete structures, affect their bearing capacity, and may lead to serious safety accidents such as partial collapse of buildings. Cracks will also reduce the durability of concrete, accelerate the corrosion of steel bars, and reduce the service life of the structure. Therefore, concrete crack detection is crucial, as it can promptly detect the existence and development trend of cracks and provide a basis for structural safety assessment. After determining the type, width, depth and other parameters of the cracks through testing, targeted repair plans can be formulated. Accurate detection can help prevent further expansion of cracks and avoid aggravation of harm. It can also provide data support for project quality control and urge construction to proceed in accordance with specifications. Testing can provide early warning of structural damage risks, reduce maintenance costs and safety hazards, extend the service life of buildings, and improve the overall quality and reliability of concrete structures.

[0003] Popular concrete crack detection methods include visual inspection, crack width detector measurement, ultrasonic detection, etc. Among them, the visual inspection method is simple and intuitive but has low accuracy; the crack width detector can accurately measure the crack width, but cannot detect the depth and direction of the crack; the ultrasonic detection method has outstanding advantages over other concrete crack detection methods. It can penetrate concrete, accurately measure the crack depth and direction, and is not affected by the surface condition of the crack. At the same time, it can conduct a relatively comprehensive inspection of large-volume concrete and complex structures with high detection accuracy.

[0004] However, ultrasonic testing also has certain limitations. Since the surface of the dark seam is intact and difficult to be directly observed, it is difficult for inspectors to find the existence of the dark seam, which increases the difficulty of detection. If a comprehensive ultrasonic test is to be carried out on the concrete surface, it will take a long time, and a large number of test points need to be tested one by one, which will cost a lot of time and manpower. In addition, for large areas of concrete floors, the workload of comprehensive ultrasonic testing is huge, which may delay the progress of the project. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to address the problem that the surface of hidden cracks is intact and difficult to be directly observed. A crack detection device is provided that can perform a comprehensive preliminary inspection of concrete floors, reveal the hidden cracks on the floor surface, and greatly reduce the construction period required for concrete crack detection.

[0006] Technical solution: The crack detection device for building concrete construction of the present invention comprises a cart, on the bottom plate of which a crack pre-detector is installed;

[0007] The crack pre-detector comprises a suspension bracket, an electromagnetic relay is mounted on the suspension bracket, an electromagnet is mounted at the center of the electromagnetic relay, an integrated frame is arranged parallel to the lower side of the suspension bracket, an armature matching the electromagnet is mounted on the upper end face of the integrated frame, a strong spring is sleeved on the armature, and both ends of the strong spring are fixedly connected to the integrated frame and the suspension bracket respectively;

[0008] A plurality of crack wall breakers distributed in an array are installed on the suspension bracket and the integrated frame. The crack wall breakers include a flow diversion assembly, a pressure storage piston assembly and a piston rod core. The pressure storage piston assembly includes a piston sleeve. A limiting slide tube is coaxially fixed to the upper end of the piston sleeve. The bottom of the outer wall of the flow diversion assembly is connected to the limiting slide tube in a limited sliding manner. Each limiting slide tube is fixed on the integrated frame, and each flow diversion assembly is fixed on the suspension bracket.

[0009] The piston rod core includes a diverter rod core, which is limitedly slidably connected to the piston sleeve, and a pressure storage chamber is provided between the diverter rod core and the piston sleeve, and a return spring is provided in the pressure storage chamber, and the two ends of the return spring are respectively fixedly connected to the top of the pressure storage chamber and the top of the diverter rod core; a one-way valve and a pressure relief valve are installed on the side wall of the piston sleeve, and the one-way valve and the pressure relief valve are both connected to the pressure storage chamber;

[0010] When the electromagnetic relay loses power, the strong spring drives the integrated frame and the limiting sliding tube parts of several crack wall breakers to quickly hit the concrete floor; when the electromagnetic relay is energized, the electromagnet attracts the armature to move the limiting sliding tube parts of the integrated frame and several crack wall breakers upward.

[0011] Furthermore, the diverter assembly includes a diverter cone head, and the crack breaker also includes a diverter cover. The upper part of the diverter cone head is open and closed by the diverter cover.

[0012] Furthermore, an isolation plate is fixedly connected to the inside of the diverter cone head, and an airflow cavity is formed between the diverter cone head and the isolation plate; an airflow tube group is arranged in the limit slide tube, and the airflow tube group is located below the airflow cavity;

[0013] The airflow pipe assembly includes an airflow main pipe, on which an airflow end spring slide rail is fixedly installed, a pipe connected to the airflow cavity is fixed at the bottom of the diverter cone head, the upper section of the airflow main pipe is limitedly slidably connected to the outer wall of the pipe, and the lower section of the airflow main pipe can be connected to the exhaust groove opened in the diverter rod core when the diverter rod core is reset;

[0014] The airflow end is provided with a cut-off plate in a limited sliding connection with the spring slide rail, and the cut-off plate includes a diverter plug plate, and a vent hole is provided at the outer end of the diverter plug plate. In the initial state, the vent hole at the outer end is connected to the upper and lower airflow main pipes;

[0015] The split cover is connected with an air supply pipeline;

[0016] When the limiting sliding pipe part hits downward, if cracks appear on the concrete floor, the piston rod core will smoothly enter the cracks and no longer squeeze the gas inside the pressure storage chamber. At this time, the gas entering the air flow chamber is discharged into the exhaust groove in the diverter rod core through the air flow main pipe, and is blown into the concrete cracks through the exhaust grooves to remove debris inside the cracks.

[0017] Furthermore, the gas supply pipes on the plurality of crack breakers are connected to a gas supply main, and the gas supply main is connected to a gas source.

[0018] Furthermore, a front end magnetic block is fixedly connected to the inner side of the diverter plug plate, and a vent hole is also provided at the inner end of the diverter plug plate;

[0019] The airflow pipe group also includes an airflow branch pipe and a shunt air pipe. The airflow branch pipe is fixedly connected to the inner side of the upper side wall of the spring slide rail at the airflow end, and the shunt air pipe is fixedly connected to the lower side wall of the spring slide rail at the airflow end; the other end of the shunt air pipe is fixedly connected to the lower section of the water pipe, and another pipe connected to the airflow cavity is fixed at the bottom of the shunt cone head, and the upper section of the airflow branch pipe is limitedly slidably connected to the outer side wall of the other pipe;

[0020] A resin storage chamber and a water storage chamber are formed between the diverter cone and the isolation plate; a water flow pipe group and a resin feed pipe group are also provided in the limit slide pipe, the water flow pipe group is located below the water storage chamber, and the resin feed pipe group is located below the resin storage chamber;

[0021] The water flow pipe group includes a water pipe, on which a water flow end spring slide rail is installed, a pipe connected to the water storage cavity is fixed at the bottom of the diverter cone head, the top of the water pipe is limitedly slidably connected to the outer wall of the pipe, and the bottom of the water pipe can be connected to the drainage groove opened in the diverter rod core when the diverter rod core is reset;

[0022] The resin feed pipe assembly includes a resin discharge pipe, on which a resin end spring slide rail is installed, a pipe connected to the resin storage chamber is fixed at the bottom of the diverter cone head, the top of the resin discharge pipe is limitedly slidably connected to the outer wall of the pipe, and the bottom of the resin discharge pipe can be connected to the resin discharge groove opened in the diverter rod core when the diverter rod core is reset;

[0023] The resin end spring slide rail and the water end spring slide rail are internally limited and slidably connected with a diverter plate, the diverter plate includes a material cut-off valve plate, the inner end of the material cut-off valve plate is fixedly connected with an internal magnetic block, and a feeding through hole is opened on the material cut-off valve plate near the internal magnetic block; when the diverter plug plate moves to the outermost side along the air flow end spring slide rail, the air vent at the inner end connects the diverter air pipe and the air flow branch pipe, the two feeding through holes are respectively connected with the resin discharge pipe and the water pipe, and the air vent at the outer end blocks the upper and lower air flow main pipes; a sliding rod is fixedly connected to the middle position of the top of the diverter rod core, the sliding rod is limited and slidably connected to the middle position of the top of the piston sleeve, and a sliding magnetic block is fixedly connected to the top of the sliding rod, and the sliding magnetic block is respectively used in conjunction with the front end magnetic block and the two internal magnetic blocks to drive the cut-off plate and the diverter plate to move outward on the corresponding spring slide rail to change the on-off state of the corresponding pipeline;

[0024] The diverter cover is also connected with pipelines for supplying water and resin particles.

[0025] Furthermore, a wedge-shaped tail plate is fixedly connected to the outer side of the diverter plug plate, an outer wedge-shaped block is fixedly connected to the outer end of the material cut-off valve plate, and three reset wedge blocks distributed in a circular array are fixedly connected to the lower side wall of the diverter cone head. The reset wedge blocks are respectively used in conjunction with the two outer wedge blocks and the wedge-shaped tail plate. When the limiting slide tube moves upward, the two diverter plates and the cut-off plate are reset together.

[0026] Furthermore, the water in the water storage chamber is colored water mixed with pigments. The colored water and the resin gel can form a marking color at the dark seam, and the inspection personnel can observe the dark seam area more intuitively according to the marking color, thereby avoiding the occurrence of missed inspection of concrete cracks.

[0027] Furthermore, the water supply pipes and the resin particle supply pipes on the plurality of crack breakers are respectively connected through a main pipeline so as to provide water and resin particles to each crack breaker.

[0028] Furthermore, a plurality of retaining springs distributed in a linear array are arranged on the inner side wall of the spring-loaded slide rail to prevent the vibration generated during crack detection from causing the intercepting plate and the diverter plate to be displaced.

[0029] Furthermore, a plurality of crack breakers are distributed in a rectangular array.

[0030] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention can solve the problem that the surface of hidden cracks is intact and difficult to be directly observed. The hidden cracks on the floor surface can be revealed by the crack breaker, greatly reducing the construction period required for concrete crack detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 and Figure 2 is a schematic diagram of the structure of a crack detection device provided by an embodiment of the present invention at different viewing angles;

[0032] Figure 3 is a schematic structural diagram of a crack pre-detector according to an embodiment of the present invention;

[0033] Figure 4 is an isometric cross-sectional view of a crack pre-detector according to an embodiment of the present invention;

[0034] Figure 5 1. It is a schematic structural diagram of a crack pre-detector according to an embodiment of the present invention, in which an electromagnetic relay, an electromagnet, an armature and a strong spring are hidden;

[0035] Figure 6 Schematic diagram of the structure of the crack breaker in the embodiment of the present invention;

[0036] Figure 7 is a schematic diagram of the internal structure of the flow diversion component in an embodiment of the present invention;

[0037] Figure 8 It is a top view of the crack wall breaker hidden diversion cover and diversion assembly in an embodiment of the present invention;

[0038] Fig. 9 yes Figure 8 AA isometric cross-sectional view;

[0039] Fig.10 It is a schematic structural diagram of an air flow pipe group, a water flow pipe group, a resin feed pipe group, a intercepting plate and a diverter plate in an embodiment of the present invention;

[0040] Fig.11 yes Fig.10 Exploded diagram of

[0041] Fig.12 It is a schematic diagram of the matching structure of the reset wedge block, the outer wedge block and the wedge tail plate in an embodiment of the present invention;

[0042] Fig.13 Schematic diagram of the structure of the spring-loaded slide rail and the intercepting plate at the airflow end in the embodiment of the present invention;

[0043] Fig.14 yes Figure 6 A top view of

[0044] Fig.15 yes Fig.14 BB section view;

[0045] Fig.16 Schematic diagram of a retaining spring on a spring-loaded slide rail at an airflow end in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings.

[0047] Attached Figures 1 to 16The reference numerals in the figures are as follows:

[0048] 1, cart; 2, base plate; 3, crack pre-detector;

[0049] 31, suspension bracket; 32, integrated frame; 33, electromagnetic relay; 34, crack breaker; 35, electromagnet; 36, armature; 37, strong spring;

[0050] 341, flow divider cover; 342, flow divider assembly; 343, limit slide pipe; 344, pressure storage piston assembly; 345, piston rod core; 346, pressure relief valve; 347, check valve; 348, return spring; 349, air flow pipe assembly; 3410, water flow pipe assembly; 3411, resin feed pipe assembly; 3412, intercepting plate; 3413, flow divider;

[0051] 3421, diverter cone; 3422, isolation plate; 3423, air flow chamber; 3424, resin storage chamber; 3425, water storage chamber; 3426, reset wedge block;

[0052] 3441, piston sleeve; 3442, pressure storage chamber;

[0053] 3451, shunt rod core; 3452, slide rod; 3453, slide magnetic block;

[0054] 3491, airflow branch pipe; 3492, airflow main pipe; 3493, airflow end spring slide rail; 3494, split air pipe;

[0055] 34101, water pipe; 34102, spring slide rail at water flow end;

[0056] 34111, resin discharge pipe; 34112, resin end spring slide rail;

[0057] 34121, diverter plug plate; 34122, vent hole; 34123, wedge-shaped tail plate; 34124, front end magnetic block;

[0058] 34131, outer wedge block; 34132, material cut-off valve plate; 34133, material supply through hole; 34134, internal magnetic block.

[0059] Example 1

[0060] like Figures 1 to 5 As shown, this embodiment 1 provides a crack detection device for building concrete construction, including a cart 1, a bottom plate 2 is fixedly installed at the bottom of the cart 1, and a crack pre-detector 3 is installed at the middle position of the top of the bottom plate 2.

[0061] The crack pre-detector 3 includes a suspension bracket 31 fixed on the bottom plate 2, an electromagnetic relay 33 is installed at the middle position of the top of the suspension bracket 31, an electromagnet 35 is installed at the center position of the electromagnetic relay 33, an integrated frame 32 is arranged parallel to the bottom of the suspension bracket 31, and an armature 36 matching the electromagnet 35 is fixedly installed at the center position of the upper end surface of the integrated frame 32. A strong spring 37 is sleeved on the armature 36, one end of the strong spring 37 is fixedly connected to the upper end surface of the integrated frame 32, and the other end is fixedly connected to the bottom of the suspension bracket 31.

[0062] A plurality of crack breakers 34 distributed in a rectangular array are installed on the suspension bracket 31 and the integrated frame 32 .

[0063] like Figures 6 to 9 As shown, the crack wall breaker 34 includes a flow dividing assembly 342, a pressure storage piston assembly 344 and a piston rod core 345. The pressure storage piston assembly 344 includes a piston sleeve 3441. A limiting slide tube 343 (with a step surface on the periphery to play an axial limiting role) is coaxially fixed to the upper end of the piston sleeve 3441. The bottom of the outer wall of the flow dividing assembly 342 is limitedly slidably connected with the limiting slide tube 343. Each limiting slide tube 343 is fixed on the integrated frame 32, and each flow dividing assembly 342 is fixed on the suspension bracket 31.

[0064] The piston rod core 345 includes a diverter rod core 3451, which is limitedly slidably connected to the piston sleeve 3441. A pressure storage chamber 3442 is provided between the diverter rod core 3451 and the piston sleeve 3441. A return spring 348 is provided in the pressure storage chamber 3442. The two ends of the return spring 348 are respectively fixedly connected to the top of the pressure storage chamber 3442 and the top of the diverter rod core 3451. A one-way valve 347 is installed on the left side wall of the piston sleeve 3441, and a pressure relief valve 346 is installed on the right side wall of the piston sleeve 3441. Both the one-way valve 347 and the pressure relief valve 346 are connected to the pressure storage chamber 3442.

[0065] The cart 1 is pushed to move on the concrete floor. During the movement of the cart 1, it stays in a detection area for a few seconds each time it reaches the area, providing crack pre-detection time for the crack pre-detection device 3. In the initial state, the electromagnet 35 attracts the armature 36. When the cart 1 reaches the target area, the external controller controls the coil of the electromagnetic relay 33 to be de-energized, the electromagnet 35 loses its magnetic attraction, and the strong spring 37 drives the integrated frame 32 and the limiting slide tubes 343 of several crack wall breakers 34 to quickly hit the concrete floor.

[0066] Driven by the reaction force of the concrete floor, the piston rod core 345 squeezes the gas in the pressure storage chamber 3442. When the gas pressure in the pressure storage chamber 3442 reaches the discharge threshold of the pressure relief valve 346, the pressure relief valve 346 opens, and the gas is discharged through the pressure relief valve 346, so that the diverter rod core 3451 is completely collected in the pressure storage chamber 3442. The compressed gas in the pressure storage chamber 3442 is used to judge whether there are cracks in the concrete floor. When the pressure of the compressed gas reaches the discharge threshold of the pressure relief valve 346, but the diverter rod core 3451 is still in a trend of moving upward, it is judged that there are no cracks in the concrete floor at this position. At this time, the pressure of the gas in the pressure storage chamber 3442 is released by exhausting the pressure relief valve 346, which can prevent the diverter rod core 3451 from being damaged due to excessive force, and at the same time protect the intact concrete floor from being damaged by the impact of the diverter rod core 3451.

[0067] When a detection area completes crack pre-inspection, the external controller controls the coil of the electromagnetic relay 33 to be energized, restoring the magnetic attraction of the electromagnet 35. The electromagnet 35 attracts the armature 36, and the integrated frame 32 is driven to move upward, thereby driving the limiting slide tubes 343 of several crack breakers 34 to move upward together.

[0068] Example 2

[0069] like Figures 6 to 11 As shown, this embodiment 2 provides another technical solution based on embodiment 1.

[0070] The crack breaker 34 further includes a diverter cover 341 , and the diverter assembly 342 includes a diverter cone head 3421 . The upper portion of the diverter cone head 3421 is opened and closed by the diverter cover 341 .

[0071] The interior of the diverter cone 3421 is fixedly connected with an isolation plate 3422, and an airflow cavity 3423 is formed between the diverter cone 3421 and the isolation plate 3422. An airflow tube group 349 is arranged in the limiting slide tube 343, and the airflow tube group 349 is located below the airflow cavity 3423.

[0072] The airflow pipe assembly 349 includes an airflow main pipe 3492, an airflow end spring slide rail 3493 is fixedly installed in the middle position of the airflow main pipe 3492, a pipe connected to the airflow cavity 3423 is fixed at the bottom of the diverter cone head 3421, the upper section of the airflow main pipe 3492 is limitedly slidably connected to the outer wall of the pipe, and the lower section of the airflow main pipe 3492 can be connected to the exhaust groove opened in the diverter rod core 3451, such as Fig.15 shown.

[0073] Combination Figures 13 to 16A plurality of retaining springs are arranged on the inner side wall of the airflow end spring slide rail 3493, and the airflow end spring slide rail 3493 is internally limited and slidably connected with a cut-off plate 3412. The cut-off plate 3412 includes a diverter plug plate 34121, and a vent hole 34122 is opened at the outer end of the diverter plug plate 34121. In the initial state, the vent hole 34122 at the outer end connects the upper and lower airflow main pipes 3492.

[0074] An air supply pipeline is connected to the diverter cover 341, and the air supply pipelines on the crack wall breakers 34 are connected to a main air supply pipe, and the main air supply pipe is connected to an air source.

[0075] When the limiting slide tube 343 hits downward, if cracks appear on the concrete floor, the piston rod core 345 smoothly enters the crack and no longer squeezes the gas inside the pressure storage chamber 3442. At this time, the gas entering the airflow chamber 3423 is discharged into the exhaust groove in the diverter rod core 3451 through the airflow main pipe 3492, and is blown into the concrete crack through the exhaust groove. The blown air flow removes debris inside the crack to prevent the debris from affecting the crack detection accuracy during the subsequent formal inspection.

[0076] Example 3

[0077] like Figures 6 to 16 As shown, this embodiment 3 provides another technical solution based on embodiment 2.

[0078] The inner side of the diverter plug 34121 is fixedly connected with a front end magnetic block 34124, and the outer side of the diverter plug 34121 is fixedly connected with a wedge-shaped tail plate 34123. The inner side end of the diverter plug 34121 is also provided with a vent hole 34122, that is, the diverter plug 34121 has two vent holes 34122.

[0079] The airflow pipe assembly 349 also includes an airflow branch pipe 3491 and a diverter pipe 3494. The airflow branch pipe 3491 is fixedly connected to the upper side wall of the spring slide rail 3493 at the airflow end, and the diverter pipe 3494 is fixedly connected to the lower side wall of the spring slide rail 3493 at the airflow end. The other end of the diverter pipe 3494 is fixedly connected to the lower section of the water pipe 34101. Another pipe connected to the airflow cavity 3423 is fixed at the bottom of the diverter cone 3421. The upper section of the airflow branch pipe 3491 is limitedly slidably connected to the outer side wall of the other pipe. The diverter pipe 3494 and the airflow branch pipe 3491 can be connected to each other through the vent hole 34122 at the inner end.

[0080] A resin storage chamber 3424 and a water storage chamber 3425 are formed between the diverter cone 3421 and the isolation plate 3422. A water flow pipe group 3410 and a resin supply pipe group 3411 are also provided in the limiting slide pipe 343. The water flow pipe group 3410 is located below the water storage chamber 3425, and the resin supply pipe group 3411 is located below the resin storage chamber 3424.

[0081] The water flow pipe group 3410 includes a water flow pipe 34101, a water flow end spring slide rail 34102 is installed in the middle position of the water flow pipe 34101, a pipe connected to the water storage chamber 3425 is fixed at the bottom of the diverter cone head 3421, the top of the water flow pipe 34101 is limitedly slidably connected to the outer wall of the pipe, and the bottom of the water flow pipe 34101 can be connected to the drainage groove opened in the diverter rod core 3451.

[0082] The resin feed pipe group 3411 includes a resin discharge pipe 34111, a resin end spring slide rail 34112 is installed in the middle position of the resin discharge pipe 34111, a pipe connected to the resin storage chamber 3424 is fixed at the bottom of the diverter cone head 3421, the top of the resin discharge pipe 34111 is limitedly slidably connected to the outer wall of the pipe, and the bottom of the resin discharge pipe 34111 can be connected to the resin discharge groove opened in the diverter rod core 3451.

[0083] A plurality of retaining springs (a hemispherical structure embedded in the inner wall of the spring slide rails through springs) are arranged on the inner wall of the resin end spring slide rail 34112 and the water flow end spring slide rail 34102 in a linear array, and the resin end spring slide rail 34112 and the water flow end spring slide rail 34102 are internally limited and slidably connected with a diverter plate 3413. The diverter plate 3413 includes a material cut-off valve plate 34132, the outer end of which is fixedly connected to an outer wedge block 34131, the inner end of which is fixedly connected to an inner magnetic block 34134, and the material cut-off valve plate 34132 is provided with a feed through hole 34133 near the inner magnetic block 34134.

[0084] A slide bar 3452 is fixedly connected to the top middle position of the diverter rod core 3451, and the slide bar 3452 is limitedly slidably connected to the top middle position of the piston sleeve 3441. A sliding magnet 3453 is fixedly connected to the top of the slide bar 3452, and the sliding magnet 3453 is used in conjunction with the front end magnet 34124 and the two internal magnets 34134 respectively.

[0085] When the diverter rod core 3451 contacts the concrete on the surface of the blind seam, as the pressure of the gas inside the pressure storage chamber 3442 gradually increases due to compression, the pressure acting on the top of the diverter rod core 3451 gradually increases, thereby increasing the pressure of the diverter rod core 3451 on the concrete surface, and then breaking the concrete on the surface of the blind seam. When the diverter rod core 3451 successfully breaks the concrete at the blind seam, the broken concrete debris falls into the inside of the concrete blind seam, and the diverter rod core 3451 probes into the inside of the blind seam. The reset spring 348 drives the diverter rod core 3451 to extend again. The diverter rod core 3451 shows a movement trend of first up and then down relative to the piston sleeve 3441. At this time, the sliding magnet 3453 passes through the two internal magnets 34134 and the front end magnet 34124 twice (when breaking the concrete layer on the surface of the blind seam, the diverter rod core 3451 will be pressed up first, and the first time it drives the two internal magnets 34134 and the front end magnet 341 24 expands outward; when the concrete hidden seam is broken, the diverter rod core 3451 is reset under the drive of the reset spring 348, and at this time, it passes through the two internal magnetic blocks 34134 and the front magnetic block 34124 for the second time; the setting of the two passes is that when passing through the front magnetic block 34124 for the first time, the intercepting plate 3412 expands outward, and the vent hole 34122 located at the outer end is no longer connected to the air flow main pipe 3492, and the air flow is no longer discharged from the diverter rod core 3451, and when passing through for the second time, the vent hole 34122 located at the inner end is connected to the air flow branch pipe 3491, and the air flow enters the water pipe 341 01; and for the two internally connected magnetic blocks 34134, during the second pass, the feed through hole 34133 is connected to the resin discharge pipe 34111 and the water pipe 34101 respectively, and when the diverter rod core 3451 is completely reset under the drive of the reset spring 348, that is, the groove body on the piston sleeve 3441 is connected to the groove body of the diverter rod core 3451, the resin and water will be discharged from the diverter rod core 3451 together), the two diverter plates 3413 and the intercepting plate 3412 are pushed to the outermost side by the sliding magnetic block 3453, and at this time, the air vent 34122 at the inner end is connected to the air flow branch pipe 3491, and at the same time, the two feed The material through hole 34133 is connected to the resin discharge pipe 34111 and the water pipe 34101 respectively, and the water and resin stored in the water storage chamber 3425 and the resin storage chamber 3424 are discharged from the diverter cone head 3421, and are discharged through the water pipe 34101 and the resin discharge pipe 34111 and the drainage groove and resin discharge groove on the diverter rod core 3451 respectively. The water stored in the water storage chamber 3425 is colored water mixed with pigment, and the colored water is discharged into the crack together with the resin particles. At the same time, the airflow is discharged into the water pipe 34101 through the airflow branch pipe 3491 and the diverter air pipe 3494.

[0086] The purpose of the sliding magnet 3453 passing through the two internal magnets 34134 and the front end magnet 34124 twice is to distinguish between the situation where the ground surface is intact and the situation where there are obvious cracks on the ground surface. If the ground surface is intact, the diverter rod core 3451 will not be reset, and will only pass through the two internal magnets 34134 and the front end magnet 34124 once; if there are obvious cracks on the ground surface, the diverter rod core 3451 will be directly inserted into the crack position without passing through the internal magnet 34134 and the front end magnet 34124.

[0087] The retaining springs arranged on the spring-loaded slide rail 34102 at the water flow end and the spring-loaded slide rail 34112 at the resin end can prevent the intercepting plate 3412 and the diverter plate 3413 from moving due to vibration when the crack breaker 34 hits the concrete surface (the elastic force of the spring is used to press the intercepting plate 3412 and the diverter plate 3413 tightly inside the slide rail to prevent the vibration generated during the pre-inspection from causing the intercepting plate 3412 and the diverter plate 3413 to move, thereby causing problems such as airflow, water and resin leakage).

[0088] The lower side wall of the diverter cone 3421 is fixedly connected with three reset wedge blocks 3426 distributed in a circular array. The reset wedge blocks 3426 are used in conjunction with the two outer wedge blocks 34131 and the wedge tail plate 34123. When a detection area is completed, the external controller controls the coil of the electromagnetic relay 33 to be energized, the electromagnet 35 restores the magnetic attraction and attracts the armature 36, the integrated frame 32 is driven to move upward, and then drives a number of limit slides 343 to move upward together. In the process of the limit slide 343 moving upward, the reset wedge block 3426 squeezes the two outer wedge blocks 34131 and the wedge tail plate 34123, so that the two diverter plates 3413 and the intercepting plate 3412 are reset together.

[0089] At the same time, the water supply and resin particle supply pipes are respectively connected to the diverter cover 341 , and the water supply and resin particle supply pipes on several crack breakers 34 are respectively connected through a main pipeline to provide water and resin particles to each crack breakers 34 .

[0090] Working principle:

[0091] Before crack detection on the concrete floor, the device is used for crack pre-inspection, and the cart 1 is pushed to move on the concrete floor. During the movement of the cart 1, each time it reaches a detection area, it stays in the area for a few seconds, providing crack pre-inspection time for the crack pre-detector 3. When the cart 1 arrives at the target area, the external controller controls the coil of the electromagnetic relay 33 to be powered off, the electromagnet 35 loses its magnetic attraction, and the strong spring 37 drives the integrated frame 32 and the limiting slide tube 343 of several crack wall breakers 34 to quickly hit the concrete floor. Driven by the reaction force of the concrete floor, the piston rod core 345 squeezes the gas in the pressure storage chamber 3442. When the gas pressure in the pressure storage chamber 3442 reaches the discharge threshold of the pressure relief valve 346, the pressure relief valve 346 opens, and the gas is discharged through the pressure relief valve 346, so that the diverter rod core 3451 is completely collected in the pressure storage chamber 3442. Whether cracks appear in the concrete floor is determined by the compressed gas in the pressure storage chamber 3442. When the pressure of the compressed gas reaches the discharge threshold of the pressure relief valve 346, but the diverter rod core 3451 is still in a trend of moving upward, it is determined that there are no cracks in the concrete floor at that position. At this time, the pressure in the pressure storage chamber 3442 is released by exhausting the gas through the pressure relief valve 346, which can prevent the diverter rod core 3451 from being damaged by excessive force, and at the same time protect the intact concrete floor from being damaged by the impact of the diverter rod core 3451.

[0092] At the same time, in the process of the diverter rod core 3451 moving upward, the sliding magnet 3453 is driven to move upward together through the sliding rod 3452. When the sliding magnet 3453 passes the front end magnet 34124, since the sliding magnet 3453 and the front end magnet 34124 have the same magnetic poles relative to each other, the sliding magnet 3453 will push the front end magnet 34124 to move a certain distance outward. At this time, the air vent 34122 originally at the outer end leaves the bottom of the air flow main pipe 3492, and the pipeline connected to the air flow main pipe 3492 is cut off by the diverter plug plate 34121. The air flow cannot be ejected from the exhaust groove on the diverter rod core 3451, thereby reducing the gas usage. At the same time, when the sliding magnet 3453 passes through the two internal magnets 34134, the sliding magnet 3453 and the internal magnet 34134 have the same magnetic poles opposite to each other, so the sliding magnet 3453 will push the two diverter plates 3413 to move a certain distance outward, but the action time of the sliding magnet 3453 on the two diverter plates 3413 is short, so the feed through hole 34133 cannot come to the bottom of the resin discharge pipe 34111 and the water pipe 34101, and the water pipe 34101 and the resin discharge pipe 34111 are still in a blocked state.

[0093] When the limiting slide tube 343 hits downward, if cracks appear on the concrete floor, the piston rod core 345 smoothly enters the crack and no longer squeezes the gas inside the pressure storage chamber 3442. At this time, the gas entering the airflow chamber 3423 is discharged into the exhaust groove in the diverter rod core 3451 through the airflow main pipe 3492, and is blown into the concrete crack through the exhaust groove. The blown air flow removes debris inside the crack to prevent the debris from affecting the crack detection accuracy during the subsequent formal inspection.

[0094] The strength of the concrete on the surface of the blind seam is much lower than that of the intact concrete surface. When the diverter rod core 3451 contacts the concrete on the surface of the blind seam, the pressure of the gas inside the pressure storage chamber 3442 gradually increases due to compression, and the pressure acting on the top of the diverter rod core 3451 gradually increases, thereby increasing the pressure of the diverter rod core 3451 on the concrete surface, and then breaking the concrete on the surface of the blind seam. When the diverter rod core 3451 successfully breaks the concrete at the blind seam, the broken concrete debris falls into the concrete blind seam, and the diverter rod core 3451 probes into the blind seam. The reset spring 348 drives the diverter rod core 3451 to extend again. The diverter rod core 3451 moves up first and then down relative to the piston sleeve 3441. At this time, the sliding magnet 3453 passes through the two internal magnets 34134 and the front magnet 34124 twice, and the two diverters are moved. The flow plate 3413 and the intercepting plate 3412 are pushed to the outermost side by the sliding magnetic block 3453. At this time, the air vent 34122 at the inner end is connected to the air flow branch pipe 3491. At the same time, the two material supply holes 34133 are connected to the resin discharge pipe 34111 and the water pipe 34101 respectively. The water and resin stored in the water storage chamber 3425 and the resin storage chamber 3424 are discharged from the diverter cone 3421 and are connected to the resin discharge pipe 34111 and the water pipe 34101 respectively. The water stored in the water storage chamber 3425 is colored water mixed with pigments. The colored water and resin particles will be discharged into the cracks and mixed respectively. At the same time, the airflow is discharged into the water pipe 34101 through the airflow branch pipe 3491 and the diverter air pipe 3494. Driven by the airflow, the resin particles are discharged more dispersedly. At the same time, the discharged airflow will also blow off the resin on the broken concrete fragments, making it fall on the bottom and around the concrete fragments. After the resin particles come into contact with water, they will be quickly absorbed by the resin. At the same time, the resin quickly expands and then wraps the concrete fragments inside. At the same time, the expanded resin gel overflows from the broken concrete surface, making the outside of the concrete present a brightly colored marking color. The inspectors can observe the dark seam area more intuitively based on the marking color, thereby avoiding the omission of concrete cracks.

[0095] When a detection area is completed, the external controller controls the coil of the electromagnetic relay 33 to be energized, the electromagnet 35 restores the magnetic attraction and attracts the armature 36, the integrated frame 32 is driven to move upward, and then drives a number of limit slides 343 to move upward together. In the process of the limit slide 343 moving upward, the reset wedge block 3426 squeezes the two outer wedge blocks 34131 and the wedge tail plate 34123, so that the two diverter plates 3413 and the interceptor plate 3412 are reset together. After all detection areas are pre-inspected, the inspector can identify the dark seam area according to the marking color, and then the inspector uses a thin hook to remove the resin gel from the dark seam. Since the resin gel wraps the concrete fragments inside, the concrete fragments can be taken out together when the resin gel is taken out, so as to avoid the concrete fragments affecting the detection of concrete cracks in the subsequent detection process.

Claims

1. A crack detection device for building concrete construction, comprising a cart (1), characterized in that: A crack pre-detector (3) is installed on the bottom plate (2) of the cart (1); The crack pre-detector (3) comprises a suspension bracket (31), an electromagnetic relay (33) is mounted on the suspension bracket (31), an electromagnet (35) is mounted at the center of the electromagnetic relay (33), an integrated frame (32) is arranged parallel to the lower side of the suspension bracket (31), an armature (36) matched with the electromagnet (35) is mounted on the upper end surface of the integrated frame (32), a strong spring (37) is sleeved on the armature (36), and two ends of the strong spring (37) are respectively fixedly connected to the integrated frame (32) and the suspension bracket (31); A plurality of crack wall breakers (34) distributed in an array are installed on the suspension bracket (31) and the integrated frame (32). The crack wall breakers (34) include a flow diversion assembly (342), a pressure storage piston assembly (344) and a piston rod core (345). The pressure storage piston assembly (344) includes a piston sleeve (3441). A limiting slide tube (343) is coaxially fixed to the upper end of the piston sleeve (3441). The bottom of the outer wall of the flow diversion assembly (342) is connected to the limiting slide tube (343) in a limiting sliding manner. Each limiting slide tube (343) is fixed on the integrated frame (32), and each flow diversion assembly (342) is fixed on the suspension bracket (31). The piston rod core (345) comprises a diverter rod core (3451), the diverter rod core (3451) is limitedly slidably connected to the piston sleeve (3441), a pressure storage chamber (3442) is provided between the diverter rod core (3451) and the piston sleeve (3441), a return spring (348) is provided in the pressure storage chamber (3442), and two ends of the return spring (348) are respectively fixedly connected to the top of the pressure storage chamber (3442) and the top of the diverter rod core (3451); a one-way valve (347) and a pressure relief valve (346) are installed on the side wall of the piston sleeve (3441), and the one-way valve (347) and the pressure relief valve (346) are both connected to the pressure storage chamber (3442); When the electromagnetic relay (33) loses power, the strong spring (37) drives the integrated frame (32) and the limiting slide tube (343) of the plurality of crack wall breakers (34) to quickly impact the concrete floor; when the electromagnetic relay (33) is energized, the electromagnet (35) attracts the armature (36) to move the integrated frame (32) and the limiting slide tube (343) of the plurality of crack wall breakers (34) upward.

2. The crack detection device for building concrete construction according to claim 1 is characterized in that: The flow splitter assembly (342) includes a flow splitter cone head (3421), and the crack wall breaker (34) further includes a flow splitter cover (341). The upper part of the flow splitter cone head (3421) is open and is closed by the flow splitter cover (341).

3. The crack detection device for building concrete construction according to claim 2 is characterized in that: An isolation plate (3422) is fixedly connected to the inside of the flow dividing cone head (3421), and an airflow cavity (3423) is formed between the flow dividing cone head (3421) and the isolation plate (3422); an airflow tube group (349) is arranged in the limiting sliding tube (343), and the airflow tube group (349) is located below the airflow cavity (3423); The airflow pipe assembly (349) comprises an airflow main pipe (3492), on which an airflow end spring slide rail (3493) is fixedly mounted, a pipe communicating with the airflow cavity (3423) is fixedly mounted at the bottom of the diverter cone head (3421), an upper section of the airflow main pipe (3492) is limitedly slidably connected to the outer wall of the pipe, and a lower section of the airflow main pipe (3492) can communicate with an exhaust groove provided in the diverter rod core (3451) when the diverter rod core (3451) is reset; The spring-loaded slide rail (3493) at the airflow end is internally limited and slidably connected with a cut-off plate (3412), the cut-off plate (3412) comprises a diverter plug plate (34121), and a vent hole (34122) is provided at the outer end of the diverter plug plate (34121). In an initial state, the vent hole (34122) at the outer end communicates with the upper and lower airflow main pipes (3492); The flow distribution cover (341) is connected with an air supply pipeline; When the limit slide tube (343) partially strikes downward, if cracks appear on the concrete floor, the piston rod core (345) smoothly enters the cracks and no longer squeezes the gas inside the pressure storage chamber (3442). At this time, the gas introduced into the air flow chamber (3423) is discharged into the exhaust groove in the diverter rod core (3451) through the air flow main pipe (3492), and is blown into the concrete cracks through the exhaust grooves to remove debris inside the cracks.

4. The crack detection device for building concrete construction according to claim 3 is characterized in that: The gas supply pipelines on the plurality of crack wall breakers (34) are connected to a gas supply main pipe, and the gas supply main pipe is connected to a gas source.

5. The crack detection device for building concrete construction according to claim 3 or 4, characterized in that: A front end magnetic block (34124) is fixedly connected to the inner side of the diverter plug plate (34121), and a vent hole (34122) is also provided at the inner end of the diverter plug plate (34121); The airflow pipe assembly (349) further comprises an airflow branch pipe (3491) and a diverter pipe (3494), wherein the airflow branch pipe (3491) is fixedly connected to the inner side of the upper side wall of the spring-loaded slide rail (3493) at the airflow end, and the diverter pipe (3494) is fixedly connected to the lower side wall of the spring-loaded slide rail (3493) at the airflow end; the other end of the diverter pipe (3494) is fixedly connected to the lower section of the water pipe (34101), and another pipe connected to the airflow cavity (3423) is fixedly provided at the bottom of the diverter cone head (3421), and the upper section of the airflow branch pipe (3491) is limitedly slidably connected to the outer side wall of the other pipe; A resin storage chamber (3424) and a water storage chamber (3425) are formed between the flow dividing cone head (3421) and the isolation plate (3422); a water flow pipe group (3410) and a resin supply pipe group (3411) are also provided in the limiting slide pipe (343); the water flow pipe group (3410) is located below the water storage chamber (3425), and the resin supply pipe group (3411) is located below the resin storage chamber (3424); The water flow pipe assembly (3410) comprises a water flow pipe (34101), on which a water flow end spring slide rail (34102) is installed, a pipe communicating with a water storage chamber (3425) is fixed at the bottom of the diverter cone head (3421), the top of the water flow pipe (34101) is limitedly slidably connected to the outer wall of the pipe, and the bottom of the water flow pipe (34101) can be connected to a drainage groove provided in the diverter rod core (3451) when the diverter rod core (3451) is reset; The resin supply pipe group (3411) comprises a resin discharge pipe (34111), on which a resin end spring slide rail (34112) is installed, a pipe connected to the resin storage chamber (3424) is fixed at the bottom of the diverter cone head (3421), the top of the resin discharge pipe (34111) is limitedly slidably connected to the outer wall of the pipe, and the bottom of the resin discharge pipe (34111) can be connected to the resin discharge groove provided in the diverter rod core (3451) when the diverter rod core (3451) is reset; The resin end spring rail (34112) and the water end spring rail (34102) are internally limited and slidably connected with a diverter plate (3413), the diverter plate (3413) includes a material cut-off valve plate (34132), the inner end of the material cut-off valve plate (34132) is fixedly connected with an internal magnetic block (34134), and a feed through hole (34133) is provided on the material cut-off valve plate (34132) near the internal magnetic block (34134); when the diverter plug plate (34121) moves to the outermost side along the air flow end spring rail (3493), the air vent (34122) at the inner end is connected to the diverter air pipe (3494) and the air flow branch pipe (3491), and the two feed through holes (34133) are respectively connected to the resin discharge pipe (3494) and the air flow branch pipe (3491). The material pipe (34111) and the water pipe (34101) are connected, and the vent hole (34122) at the outer end blocks the upper and lower air flow main pipes (3492); a sliding rod (3452) is fixedly connected to the middle position of the top of the diverter rod core (3451), and the sliding rod (3452) is limitedly slidably connected to the middle position of the top of the piston sleeve (3441); a sliding magnetic block (3453) is fixedly connected to the top of the sliding rod (3452), and the sliding magnetic block (3453) is used in conjunction with the front magnetic block (34124) and the two internal magnetic blocks (34134) to drive the intercepting plate (3412) and the diverter plate (3413) to move outward on the corresponding spring-loaded slide rails to change the on-off state of the corresponding pipelines; The flow distribution cover (341) is also connected to pipelines for supplying water and resin particles.

6. The crack detection device for building concrete construction according to claim 5, characterized in that: The outer side of the flow dividing plug plate (34121) is fixedly connected with a wedge-shaped tail plate (34123), the outer end of the material cutting valve plate (34132) is fixedly connected with an outer wedge-shaped block (34131), and the lower side wall of the flow dividing cone head (3421) is fixedly connected with three reset wedge-shaped blocks (3426) distributed in a circumferential array. The reset wedge-shaped blocks (3426) are respectively used in conjunction with the two outer wedge-shaped blocks (34131) and the wedge-shaped tail plate (34123). When the limiting slide tube (343) moves upward, the two flow dividing plates (3413) and the flow cutting plate (3412) are reset together.

7. The crack detection device for building concrete construction according to claim 5, characterized in that: The water in the water storage chamber (3425) is colored water mixed with pigment.

8. The crack detection device for building concrete construction according to claim 5, characterized in that: The water supply pipes and the resin particle supply pipes on the plurality of crack wall breakers (34) are respectively connected through a main pipeline so as to provide water and resin particles to each crack wall breaker (34).

9. The crack detection device for building concrete construction according to claim 5, characterized in that: A plurality of retaining springs distributed in a linear array are arranged on the inner side wall of the spring-loaded slide rail, so as to prevent the vibration generated during crack detection from causing the intercepting plate (3412) and the diverter plate (3413) to move.

10. The crack detection device for building concrete construction according to claim 1, characterized in that: A plurality of crack breakers (34) are distributed in a rectangular array.

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