A reinforced concrete structure testing method

Abstract

A reinforced concrete structure testing method, the testing process includes a hole preparation stage, a pouring stage, and a detection stage; the detection method in the detection stage includes a temperature control method and a water level control method; the temperature control method includes: the temperature sensor is arranged on the outer wall, the heater is arranged on the bottom wall, the controller wirelessly connects the temperature sensor and the heater, and the water temperature is changed by the heater to simulate different water temperature environments; the water level control method includes: a first water pump can inject water in a pool into between the outer casing and the concrete column, and a second water pump can inject water in an outer pile hole into the pool, so as to control the water level in the outer pile hole to simulate the different water levels caused by high and low tides.

Description

Technical Field

[0001] The invention relates to the field of reinforced concrete structure safety, and in particular to a reinforced concrete structure testing method. Background Art

[0002] Steel bar corrosion has a great impact on the durability and safety of concrete structures. Under the influence of factors such as carbonization and chloride ion erosion, the pH value of the medium inside the concrete gradually decreases, and the passivation film formed on the surface of the steel bar in the alkaline medium will gradually be destroyed and lose its protective effect, causing the steel bar to rust. Steel bar corrosion not only affects the bonding performance between the steel bar and concrete, but also causes the concrete protective layer to crack under tension. Once cracks occur, harmful substances will more easily enter the surface of the steel bar, thereby accelerating its corrosion. Corrosion not only affects the performance of the structure, but in severe cases it may even threaten the safety of the structure. Therefore, it is necessary to monitor the steel bar corrosion in concrete structures, find problems and deal with them in a timely manner to reduce the occurrence of accidents.

[0003] Especially for reinforced concrete structures that serve as piers of underwater bridges, the steel corrosion phenomenon at the interface between water and air is more serious than that in pure water and pure air or underground. Therefore, safety detection of steel corrosion for reinforced concrete structures that serve as piers of underwater bridges is essential.

[0004] In actual engineering practice, there are the following problems:

[0005] 1. In the prior art, the steel bar corrosion detection in concrete structures generally involves setting up a special laboratory or site, setting up an outer shell or outer box on the outside of the reinforced concrete structure, adding water to the outer box and controlling other conditions to simulate the water environment corrosion mentioned above to perform corrosion tests on the reinforced concrete structure. However, this test requires a special site, water pool, installation cost, and transportation cost.

[0006] 2. The existing technology of steel corrosion detection in reinforced concrete structures involves a large number of transportation links. Reinforced concrete structures are often transported from other places to the laboratory. If the concrete is of poor quality and has cracks, changes in the environment during transportation can easily lead to steel corrosion. It is actually inaccurate to detect corrosion after taking it to the laboratory because it has already rusted. If it is taken out from a warehouse after being stored for a long time, the possibility of premature corrosion is even greater.

[0007] 3. In the existing reinforced concrete pile pouring technology, after the concrete pouring is completed, there may be a casing on the outside, which is actually no problem. However, in the steel corrosion test, the reinforced concrete structure is in contact with water, so the casing must be removed. For the sake of stability, some casings have penetrated deep into the ground and are not easy to remove. There is no effective way to balance stability and testing.

[0008] 4. The detachable structure of the prior art has a more flexible function, but is not as stable and strong as the integrated structure; specifically in the field of reinforced concrete piles, for the cast casing, its detachable structure may lead to instability.

[0009] 5. When pouring reinforced concrete in the prior art, there is no good solution for how to keep the steel bars and some accessories in place in the face of falling concrete slurry. Summary of the invention

[0010] In order to overcome the above problems, the present invention proposes a solution to solve the above multiple problems at the same time.

[0011] The technical solution adopted by the present invention to solve the technical problem is: a reinforced concrete structure testing method, using a testing system to detect steel corrosion; the testing system includes an outer pile hole, an inner pile hole, an outer casing, an inner casing, a sleeve, an arm, a wire tube, steel bars, a concrete column, a second sensor, a first sensor, a fixing ring, an electronic device, a clamp, a heater, a temperature sensor, a controller, a pool, a first water pump, and a second water pump; the inner casing includes a lower casing and an upper casing; the outer casing includes an outer wall, a bottom wall, and a collar; the testing process includes a hole preparation stage, a pouring stage, and a detection stage; the detection method in the detection stage includes a temperature control method and a water level control method;

[0012] In the hole preparation stage, the outer pile hole is excavated on the ground, and after completion, the inner pile hole is excavated downward from the bottom of the outer pile hole; the inner casing is fixed in the inner pile hole, an upper convex ring is integrally provided above the lower casing, and a lower convex ring is integrally provided below the upper casing, and the upper convex ring and the lower convex ring are detachably connected through a connecting piece; the outer casing is arranged in the outer pile hole, a through hole is arranged on the bottom wall for the inner casing to pass through, the outer wall, the bottom wall, and the collar are integrally formed, and the collar is arranged above the bottom wall;

[0013] During the pouring stage, the upper casing and the lower casing are in a connected state, the sleeve is sleeved between the collar and the inner casing, the outer wall of the sleeve abuts against the inner wall of the collar, and the inner wall of the sleeve abuts against the upper casing and the lower casing at the same time; the inner wall of the upper casing is provided with an arm extending inward, and the end of the arm is provided with a clamping claw; the wire pipe is clamped by the clamping claw, and the outer wall of the steel bar is sleeved with a fixing ring, and the fixing ring and the wire pipe are fixedly connected by a connecting rod; after the above-mentioned structural setting is completed, concrete is poured into the inner casing; after the concrete pouring is completed, the clamped part of the wire pipe is exposed outside the concrete column, and the steel bar is completely buried in the concrete column;

[0014] During the detection phase, the upper casing and the sleeve are removed, and the outer wall of the steel bar is also provided with a first sensor and a second sensor; the first sensor and the second sensor are connected to an external electronic device through a wire inserted in the wire tube;

[0015] The temperature control method comprises: the temperature sensor is arranged on the outer wall, a heater is arranged on the bottom wall, the controller wirelessly connects the temperature sensor and the heater, and changes the temperature of water through the heater to simulate different water temperature environments;

[0016] The water level control method includes: a first water pump can inject water in the water pool into the space between the outer casing and the concrete column, and a second water pump can inject water in the outer pile hole into the water pool, thereby controlling the water level in the outer pile hole to simulate the different water levels caused by high tide and low tide.

[0017] Preferably, the electronic device is a display device.

[0018] Preferably, a connecting tube is provided between the first sensor and the wire tube to accommodate the wire.

[0019] Preferably, the second sensor is a ring-shaped resistance strain sensor.

[0020] Preferably, during the pouring stage, the upper end of the steel bar is lower than the upper end of the inner casing.

[0021] Preferably, during the pouring stage, the upper end of the wire tube is higher than the upper end of the inner casing.

[0022] Preferably, after pouring is completed, the arm and the clamping claw are exposed above the concrete column.

[0023] Preferably, the number of the first sensors is three, and the number of the fixing rings is two.

[0024] Preferably, the number of the second sensors is two.

[0025] Preferably, during the testing phase, the lower end of the wire tube is higher than the lower end of the steel bar.

[0026] The beneficial effects of the present invention are:

[0027] 1. With regard to the first point raised in the background technology, the existing site is used to solve the problem. During the construction of bridge piers over water, each pier needs to be poured with reinforced concrete, wherein the piers at both ends of the bridge are directly placed on the ground, and only the middle pier is placed underwater. The pouring of the piers on the ground requires drilling pile holes and clearing the holes with a mud pool. The present invention utilizes the existing pile holes (or the locations of the pile holes) and mud pools, utilizes the existing pile holes (or the holes where the pile holes are located, and the diameters of the holes may be different) to perform a corrosion test on a small section of reinforced concrete structure, and utilizes the emptied mud pool as a water pool to realize water circulation, thereby eliminating the need to specially set up a test site, a test outer box, or a test water source storage tank, and pile holes can continue to be drilled on the basis of the test holes.

[0028] 2. Regarding the second point raised in the background technology, on-site pouring and testing are achieved through the cooperation of inner and outer casings. The inner casing can be used to realize on-site concrete pouring, which can be removed after the pouring is completed. The poured concrete structure is fixed in the inner pile hole. There are steel bars in the concrete structure, and there are sensors on the outer surface of the steel bars. The outer casing can contain seawater to simulate the seawater environment, so that the steel bar corrosion detection can be carried out after the pouring is completed, so as to realize immediate detection and avoid the premature corrosion of the steel bars due to a large number of transportation and storage links in the middle.

[0029] 3. Regarding the third point raised in the background technology, in order to remove the casing after the pouring is completed, the inner casing is set as an upper and lower casing, and the upper and lower casings are detachably connected. When the upper and lower casings are integrated, piling can be achieved. After the pouring is completed, the connecting parts can be disassembled to remove the upper casing so that the reinforced concrete structure is exposed to the water environment.

[0030] 4. Regarding the fourth point raised in the background technology, during the pouring operation, a sleeve is installed at the connection position of the upper and lower casings, and a ring integrated with the outer casing is provided on the outer periphery of the sleeve. Since the outer casing is stable, the ring is stable, and the upper and lower casings can be stable by the sleeve abutting against the ring. During the test, the upper casing and the sleeve can be removed.

[0031] 5. Regarding the 5th point of the background technology, a clamp is provided on the inner wall of the upper casing to clamp the wire pipe. A connecting rod is provided between the wire pipe and the steel bar. The fixing ring on the connecting rod is fixed to the outer wall of the steel bar, so as to preliminarily fix the position of the steel bar and the wire pipe. After a certain amount of concrete is poured, the position of the steel bar is stable, and the clamp does not need to be subjected to force all the time. At this time, it only plays a positioning role. After the pouring is completed, the steel bar is completely buried in the concrete, and only the clamped part of the wire pipe is exposed outside the concrete. The exposure of the wire pipe does not affect the degree of rust of the steel bar.

[0032] Note: The above designs are not listed in any particular order, and each one makes the present invention distinctive and significantly advanced compared to the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0034] Figure 1 This is a schematic diagram of the real-time perfusion state of the present invention.

[0035] Figure 2 This is a schematic diagram of the test state of the present invention after the filling and disassembly are completed.

[0036] Figure 3 The present invention Figure 1 A schematic diagram of the structure at center

[0037] Figure 4This is a three-dimensional perspective view of the reinforced concrete structure of the present invention (Note: Concrete columns are generally cylindrical, and can be square columns in special cases. This is a perspective view showing the internal structure, and the shape of the concrete column is not limited to one)

[0038] Figure 5 Schematic diagram of the clamping structure of the present invention from top view

[0039] Figure 6 This is a three-dimensional schematic diagram of the first sensor of the present invention.

[0040] Figure 7 is a cross-sectional schematic diagram of the first sensor of the present invention

[0041] Figure 8 This is the process diagram of the test method of the present invention

[0042] In the figure, the reference numerals are as follows:

[0043] 1. External pile hole 2, internal pile hole 3, external wall 4, bottom wall 5, collar 6, sleeve 7, lower casing 8, upper casing 9, arm 10, clamping claw 11, wire tube 12, steel bar 13, concrete column 14, lower convex ring 15, upper convex ring 16, second sensor 17, first sensor 18, fixing ring 19, electronic equipment. 20, insulation layer 21, PVDF sensor 22, steel sheet 23, shielding wire DETAILED DESCRIPTION

[0044] As shown in the figure: a reinforced concrete structure testing method, using a testing system to detect steel corrosion; the testing system includes an outer pile hole, an inner pile hole, an outer casing, an inner casing, a sleeve, an arm, a wire tube, steel bars, a concrete column, a second sensor, a first sensor, a fixing ring, an electronic device, a clamp, a heater, a temperature sensor, a controller, a pool, a first water pump, and a second water pump; the inner casing includes a lower casing and an upper casing; the outer casing includes an outer wall, a bottom wall, and a collar; the testing process includes a hole preparation stage, a pouring stage, and a detection stage; the detection method in the detection stage includes a temperature control method and a water level control method;

[0045] In the hole preparation stage, the outer pile hole is excavated on the ground, and after completion, the inner pile hole is excavated downward from the bottom of the outer pile hole; the inner casing is fixed in the inner pile hole, an upper convex ring is integrally provided above the lower casing, and a lower convex ring is integrally provided below the upper casing, and the upper convex ring and the lower convex ring are detachably connected through a connecting piece; the outer casing is arranged in the outer pile hole, a through hole is arranged on the bottom wall for the inner casing to pass through, the outer wall, the bottom wall, and the collar are integrally formed, and the collar is arranged above the bottom wall;

[0046] During the pouring stage, the upper casing and the lower casing are in a connected state, the sleeve is sleeved between the collar and the inner casing, the outer wall of the sleeve abuts against the inner wall of the collar, and the inner wall of the sleeve abuts against the upper casing and the lower casing at the same time; the inner wall of the upper casing is provided with an arm extending inward, and the end of the arm is provided with a clamping claw; the wire pipe is clamped by the clamping claw, and the outer wall of the steel bar is sleeved with a fixing ring, and the fixing ring and the wire pipe are fixedly connected by a connecting rod; after the above-mentioned structural setting is completed, concrete is poured into the inner casing; after the concrete pouring is completed, the clamped part of the wire pipe is exposed outside the concrete column, and the steel bar is completely buried in the concrete column;

[0047] During the detection phase, the upper casing and the sleeve are removed, and the outer wall of the steel bar is also provided with a first sensor and a second sensor; the first sensor and the second sensor are connected to an external electronic device through a wire inserted in the wire tube;

[0048] The temperature control method comprises: the temperature sensor is arranged on the outer wall, a heater is arranged on the bottom wall, the controller wirelessly connects the temperature sensor and the heater, and changes the temperature of water through the heater to simulate different water temperature environments;

[0049] The water level control method includes: a first water pump can inject water in the water pool into the space between the outer casing and the concrete column, and a second water pump can inject water in the outer pile hole into the water pool, thereby controlling the water level in the outer pile hole to simulate the different water levels caused by high tide and low tide.

[0050] As shown in the figure: the electronic device is a display setting. A connecting tube is provided between the first sensor and the wire tube to accommodate the wire. The second sensor is an annular resistance strain sensor. During the pouring stage, the upper end of the steel bar is lower than the upper end of the inner casing. During the pouring stage, the upper end of the wire tube is higher than the upper end of the inner casing. After the pouring is completed, the arm and the clamp are exposed above the concrete column. The number of the first sensors is three, and the number of the fixing rings is two. The number of the second sensors is two. During the testing stage, the lower end of the wire tube is higher than the lower end of the steel bar.

[0051] The above detailed description is a specific description of a feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention should be included in the patent scope of this case.

Claims

1. A reinforced concrete structure testing method, using a testing system to detect steel bar corrosion; characterized in that: The test system includes an outer pile hole, an inner pile hole, an outer casing, an inner casing, a sleeve, an arm, a wire tube, a steel bar, a concrete column, a second sensor, a first sensor, a fixing ring, an electronic device, a clamp, a heater, a temperature sensor, a controller, a pool, a first water pump, and a second water pump; the inner casing includes a lower casing and an upper casing; the outer casing includes an outer wall, a bottom wall, and a collar; the test process includes a hole preparation stage, a pouring stage, and a detection stage; the detection method in the detection stage includes a temperature control method and a water level control method; In the hole preparation stage, the outer pile hole is excavated on the ground, and after completion, the inner pile hole is excavated downward from the bottom of the outer pile hole; the inner casing is fixed in the inner pile hole, an upper convex ring is integrally provided above the lower casing, and a lower convex ring is integrally provided below the upper casing, and the upper convex ring and the lower convex ring are detachably connected through a connecting piece; the outer casing is arranged in the outer pile hole, a through hole is arranged on the bottom wall for the inner casing to pass through, the outer wall, the bottom wall, and the collar are integrally formed, and the collar is arranged above the bottom wall; During the pouring stage, the upper casing and the lower casing are in a connected state, the sleeve is sleeved between the collar and the inner casing, the outer wall of the sleeve abuts against the inner wall of the collar, and the inner wall of the sleeve abuts against the upper casing and the lower casing at the same time; the inner wall of the upper casing is provided with an arm extending inward, and the end of the arm is provided with a clamping claw; the wire pipe is clamped by the clamping claw, and the outer wall of the steel bar is sleeved with a fixing ring, and the fixing ring and the wire pipe are fixedly connected by a connecting rod; after the above-mentioned structural setting is completed, concrete is poured into the inner casing; after the concrete pouring is completed, the clamped part of the wire pipe is exposed outside the concrete column, and the steel bar is completely buried in the concrete column; During the detection phase, the upper casing and the sleeve are removed, and the outer wall of the steel bar is also provided with a first sensor and a second sensor; the first sensor and the second sensor are connected to an external electronic device through a wire inserted in the wire tube; The temperature control method comprises: the temperature sensor is arranged on the outer wall, a heater is arranged on the bottom wall, the controller wirelessly connects the temperature sensor and the heater, and changes the temperature of water through the heater to simulate different water temperature environments; The water level control method includes: a first water pump can inject water in a water pool between the outer casing and the concrete column, and a second water pump can inject water in an outer pile hole into the water pool, thereby controlling the water level in the outer pile hole to simulate the different water levels caused by high tide and low tide.

2. A reinforced concrete structure testing method according to claim 1, characterized in that: The electronic device is a display device.

3. A reinforced concrete structure testing method according to claim 1, characterized in that: A connecting tube is provided between the first sensor and the wire tube to accommodate the wire.

4. A reinforced concrete structure testing method according to claim 1, characterized in that: The second sensor is a ring-shaped resistance strain sensor.

5. A reinforced concrete structure testing method according to claim 1, characterized in that: During the pouring stage, the upper end of the steel bar is lower than the upper end of the inner casing.

6. A reinforced concrete structure testing method according to claim 5, characterized in that: During the pouring stage, the upper end of the wire tube is higher than the upper end of the inner casing.

7. A reinforced concrete structure testing method according to claim 6, characterized in that: After pouring is completed, the arm and the clamping jaws are exposed above the concrete column.

8. A reinforced concrete structure testing method according to claim 1, characterized in that: The number of the first sensors is three, and the number of the fixing rings is two.

9. A reinforced concrete structure testing method according to claim 1, characterized in that: The number of the second sensors is two.

10. A reinforced concrete structure testing method according to claim 1, characterized in that: During the testing phase, the lower end of the wire tube is higher than the lower end of the steel bar.

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