A concrete jacking construction performance testing device, system and evaluation method

Abstract

This invention discloses a concrete jacking construction performance testing device, comprising an upper shell, a lower shell, a horizontal partition assembly, and a main pipe; the upper shell is vertically continuous; the lower shell has an opening at its top; the upper shell is installed on top of the lower shell, and the upper and lower shells are separated by the horizontal partition assembly, which is fixed to the lower port of the upper shell; the horizontal partition assembly has a through hole A connecting the upper and lower shells; the horizontal partition assembly is also equipped with a rotary valve for controlling the opening and closing of through hole A; a main pipe connecting the lower shell to its interior is provided outside the lower shell, and a main valve is installed on the main pipe. This invention also discloses a method for evaluating the performance of concrete jacking construction. The beneficial effects of this invention are: it can test and evaluate the performance of concrete during the jacking process, thereby further determining the jacking capability of concrete in actual engineering projects, so as to facilitate timely adjustments to the concrete performance and ensure jacking construction efficiency and project quality.

Description

Technical Field

[0001] This invention relates to the field of concrete performance testing technology, specifically to a concrete jacking construction performance testing device, system, and evaluation method. Background Technology

[0002] Super high-rise projects involve core tube shear walls, mega-columns, and external frames. Due to their complex structure, the pouring height is relatively high. At the same time, in order to avoid the poor continuity of concrete structure and the segregation and root rot caused by traditional high-throw and cascade pouring methods, complex structures such as steel-concrete composite can be constructed by jacking. That is, the pumping pressure of the concrete pump is used to pour self-compacting concrete from the bottom of the steel pipe column, flowing from bottom to top until the entire steel pipe column is filled.

[0003] However, the jacking construction uses a reverse pouring method, which involves factors such as pumping pressure, the weight of the already poured concrete, and corresponding viscous resistance. For ultra-high-rise buildings, pumped concrete is affected by gravity and structural side formwork, making jacking construction difficult. Furthermore, the jacking performance of concrete affects construction efficiency and project quality. Therefore, it is essential to test and evaluate the jacking performance of concrete to allow for timely adjustments; however, current technology lacks relevant equipment and methods for testing the jacking workability of concrete. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a concrete jacking construction performance testing device, system, and evaluation method, which aims to test and evaluate the performance of concrete during the jacking process through concrete testing.

[0005] The technical solution adopted in this invention is: a concrete jacking construction performance testing device, comprising an upper shell, a lower shell, a horizontal partition assembly, and a main pipeline;

[0006] The upper shell is continuous from top to bottom; the lower shell has an opening at the top.

[0007] The upper housing is mounted on top of the lower housing, and the upper housing and the lower housing are separated by a horizontal partition assembly, which is fixed to the lower port of the upper housing. The horizontal partition assembly has a through hole A, which connects the upper housing and the lower housing. The horizontal partition assembly is also equipped with a rotary valve for controlling the opening and closing of the through hole A.

[0008] The lower housing is provided with a main pipe that connects to the interior of the lower housing, and a main valve is installed on the main pipe.

[0009] According to the above scheme, the horizontal partition assembly includes an upper partition and a lower partition that are fitted together, and the upper partition and the lower partition are respectively provided with through holes A at corresponding positions; the rotary valve includes a valve stem, the lower end of which is connected to the upper partition and can drive the upper partition to rotate horizontally relative to the lower partition; when the upper partition rotates until the positions of the through holes A of the upper partition and the lower partition are completely misaligned, the through holes A of the horizontal partition assembly are closed, and the upper and lower housings are not connected; when the upper partition rotates until the positions of the through holes A of the upper partition and the lower partition overlap, the upper and lower housings are connected.

[0010] According to the above scheme, multiple vertical partitions are installed inside the lower housing, and the vertical partitions uniformly divide the interior of the lower housing into multiple chambers; each chamber is connected to the upper housing through a through hole A on the horizontal partition assembly.

[0011] According to the above scheme, two adjacent chambers are connected by a through hole B opened on the vertical partition.

[0012] According to the above scheme, the main pipeline is connected to a side pipeline, and a side valve is installed on the side pipeline; the main valve on the main pipeline is located downstream of the side pipeline.

[0013] According to the above scheme, several buckles are arranged circumferentially on the lower outer wall of the upper shell, and the buckles can be fastened to the fixing rod, which is located on the upper outer wall of the lower shell.

[0014] According to the above scheme, the upper inner edge of the lower housing is recessed to form a mounting groove, and a sealing rubber ring is provided in the mounting groove; the bottom of the upper housing is located in the mounting groove.

[0015] The present invention also employs a concrete jacking construction performance testing system, including the testing device, pump pipe and concrete pump as described above. The main pipeline of the testing device is connected to the outlet of the concrete pump through the pump pipe, and the concrete pump's hopper is used to load concrete.

[0016] This invention also employs a method for evaluating the construction performance of concrete jacking, the method being as follows:

[0017] (1) Provide the components of the test system as described above, and check the sealing of the pipeline after connection;

[0018] (2) After mixing the concrete, load it into the placing hopper of the concrete pump and turn on the concrete pump.

[0019] (3) Observe the outflow status of the concrete in the side pipe. When the concrete flows out steadily and continuously, close the side pipe valve and open the main valve at the same time to allow the concrete to flow into the lower shell and start timing.

[0020] (4) Keep the pump pressure stable and observe the rise of concrete in the lower shell. Record the time t1, t2, t3, and t4 when concrete emerges from each through hole A at the horizontal partition assembly, and calculate the sample standard deviation σ. t ;

[0021] (5) When the concrete rises to the upper edge of the upper shell, immediately close the main valve and the concrete pump, and then keep the through hole A of the horizontal diaphragm assembly closed by rotating the valve.

[0022] (6) Detect the concrete density ρ inside the upper and lower shells respectively. 上 ρ 下 Calculate the density difference between the two. ρ;

[0023] (7) Based on the sample standard deviation σ t and density difference The calculated value of ρ is used to rate the jacking performance of concrete.

[0024] Using sample standard deviation σ t The rating method is as follows: if the standard deviation σ t A value ≥0.40 indicates poor jacking performance of the concrete; if the standard deviation σ t A standard deviation of σ = 0.30~0.40 indicates that the jacking performance of the concrete is qualified; if the standard deviation σ = 0.30~0.40, it indicates that the jacking performance of the concrete is qualified. t A value of 0.20~0.30 indicates good jacking performance of the concrete; the standard deviation σ t <0.20 indicates that the concrete has excellent lifting performance;

[0025] Using density difference The method for rating ρ is as follows: if the density difference ρ≥25 kg / m 3 When the density difference is high, it indicates poor jacking performance of the concrete; if the density difference is low... ρ is 15~25 kg / m 3 When the concrete's lifting performance is satisfactory, it indicates that the density difference is acceptable; if the density difference is not satisfactory, the concrete's lifting performance is acceptable. ρ is 5~15 kg / m 3 When the density difference is within a certain range, it indicates that the concrete has good lifting performance; if the density difference is too large... ρ < 5 kg / m 3 This indicates that the concrete has excellent lifting performance.

[0026] The beneficial effects of this invention are as follows:

[0027] (1) This invention can test and evaluate the performance of concrete during the jacking process, thereby further determining the jacking capability of concrete in actual engineering, so as to adjust the concrete performance in a timely manner and ensure the jacking construction efficiency and engineering quality.

[0028] (2) The device of the present invention is provided with multiple cavities and holes in the vertical and horizontal directions, which can deeply simulate the movement state of concrete when lifting complex structural entities in engineering. The difference in the flow and rising rate of concrete in different cavities can be intuitively identified by the standard deviation, which can effectively evaluate the fluidity and homogeneity of concrete when lifting complex structural entities. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the concrete lifting construction performance testing device of the present invention.

[0030] Figure 2 This is a schematic diagram of the lower housing in the device of the present invention.

[0031] Figure 3 This is a schematic diagram showing the connection between the horizontal partition assembly and the rotary valve in the device of the present invention.

[0032] Figure 4 This is a schematic diagram of the concrete jacking construction performance testing system of the present invention.

[0033] Reference numerals: 1—Lower housing, 2—Vertical partition, 2-1—Through hole B, 3—Upper housing, 4—Horizontal partition assembly, 4-1—Rotary valve, 4-1-1—Handle, 4-1-2—Valve stem, 4-2—Upper partition, 4-3—Lower partition, 4-4—Through hole A, 5—Main pipe, 5-1—Main valve, 5-2—Side valve, 5-3—Side pipe, 6—Snap fastener, 7—Pump pipe, 8—Concrete pump, 9—Pack hopper. Detailed Implementation

[0034] The invention will be further described below through specific embodiments, but the invention is not limited to the following embodiments.

[0035] like Figures 1-2 The concrete jacking construction performance testing device shown is specifically a self-compacting concrete jacking construction performance testing device, including an upper shell 3, a lower shell 1, a horizontal partition assembly 4, and a main pipe 5.

[0036] The upper housing 3 is vertically continuous; the lower housing 1 has an opening at the top.

[0037] The upper housing 3 is mounted on top of the lower housing 1, and the upper housing 3 and the lower housing 1 are separated by a horizontal partition assembly 4, which is fixed to the lower port of the upper housing 3. The horizontal partition assembly 4 has a through hole A4-4, which connects the upper housing 3 and the lower housing 1. The horizontal partition assembly 4 is also equipped with a rotary valve 4-1 for controlling the opening and closing of the through hole A4-4.

[0038] The lower housing 1 is provided with a main pipe 5 that connects to the interior of the lower housing 1, and a main valve 5-1 is installed on the main pipe 5.

[0039] Preferably, such as Figure 3 As shown, the horizontal partition assembly 4 includes an upper partition 4-2 and a lower partition 4-3 that are fitted together. The upper partition 4-2 and lower partition 4-3 each have corresponding through holes A4-4. The rotary valve 4-1 includes a valve stem 4-1-2. The lower end of the valve stem 4-1-2 is connected to the upper partition 4-2 and can drive the upper partition 4-2 to rotate horizontally relative to the lower partition 4-3. When the upper partition 4-2 rotates until the through holes A4-4 of the upper partition 4-2 and A4-4 of the lower partition 4-3 are completely misaligned, the through holes A4-4 of the horizontal partition assembly 4 are closed, and the upper housing 3 and the lower housing 1 are not connected. When the upper partition 4-2 rotates until the through holes A4-4 on the upper partition 4-2 overlap with the through holes A4-4 of the lower partition 4-3, the upper housing 3 and the lower housing 1 are connected.

[0040] In this invention, the upper end of the valve stem 4-1-2 of the rotary valve is provided with a handle 4-1-1 for easy rotation.

[0041] In this invention, the upper inner edge of the lower housing 1 is recessed to form an installation groove, and a sealing rubber ring is provided in the installation groove; the bottom of the upper housing 3 is located in the installation groove.

[0042] Preferably, a plurality of vertical partitions 2 are installed inside the lower housing 1, and the vertical partitions 2 uniformly divide the interior of the lower housing 1 into a plurality of chambers; adjacent chambers are connected by through holes B2-1 opened on the vertical partitions 2.

[0043] In this invention, the vertical partition 2 has multiple through holes B2-1; the lower housing 1 has four vertical partitions 2, which uniformly divide the interior of the lower housing 1 into four chambers, and adjacent chambers are connected by through holes B2-1. The vertical partition 2 is 60cm high, and the diameter of the connecting holes on the vertical partition 2 is 10cm.

[0044] Preferably, each chamber is connected to the upper housing 3 through a through hole A4-4 on the horizontal partition assembly 4.

[0045] In this invention, the horizontal partition assembly 4 has four through holes A4-4, which respectively connect to the four chambers of the lower housing 1; each through hole A4-4 is controlled by a rotary valve 4-1 to open or close.

[0046] Preferably, a side pipe 5-3 is connected to the main pipe 5, and a side valve 5-2 is configured on the side pipe 5-3; the main valve 5-1 on the main pipe 5 is located downstream of the side pipe 5-3.

[0047] Preferably, the lower outer wall of the upper housing 3 is provided with a plurality of buckles 6 spaced apart circumferentially. The buckles 6 can be fastened to a fixing rod, which is located on the upper outer wall of the lower housing 1. The buckle 6 design can prevent the upper housing 3 from separating from the lower housing 1.

[0048] In this embodiment, the lower shell 1 is a cylindrical barrel made of transparent acrylic material with an inner diameter of 60cm and a thickness of 2cm. The upper inner edge of the lower shell 1 is recessed to form a mounting groove (the inner half of the upper edge is 2cm lower than the outer edge), and a sealing rubber ring is installed in the mounting groove. A 10cm connecting hole is provided on the side of the lower shell 1 for connecting to the main pipe 5. A main valve 5-1 is installed on the main pipe 5, and a side pipe 5-3 is connected to the main pipe 5. A side valve 5-2 is installed on the side pipe 5-3. The upper shell 3 is a cylindrical barrel made of transparent acrylic material with an inner diameter of 60cm and a thickness of 1cm. The upper shell 3 can be embedded in the top of the lower shell 1 and fixed by circumferentially arranged buckles 6.

[0049] like Figure 4 The concrete jacking construction performance testing system shown includes a testing device, a pump pipe 7 and a concrete pump 8 as described above. The main pipe 5 of the testing device is connected to the outlet of the concrete pump 8 through the pump pipe 7. The concrete pump 8 is located in a placing hopper 9, which is used to load concrete.

[0050] A method for evaluating the performance of concrete jacking construction, the method being:

[0051] (1) Provide the components of the test system as described above, and check the sealing of the pipeline after connection.

[0052] Clean the inside of the upper housing 3 and the lower housing 1, moisten them and keep them free of standing water. Then place the upper housing 3 on top of the lower housing 1 and secure it with the buckles 6 around the perimeter. Rotate the rotary valve 4-1 to open the through hole A4-4 of the horizontal partition assembly 4 (connecting the upper housing 3 and the lower housing 1), keep the side valve 5-2 open and the main valve 5-1 closed. Connect the main pipe 5 of the lower housing 1 to the concrete pump through the pump pipe and check its sealing.

[0053] (2) After mixing the concrete, load it into the placing hopper of the concrete pump, turn on the concrete pump, and adjust the pump pressure so that the concrete moves at a speed of 0.1m / s to 0.15m / s in the pump pipe.

[0054] (3) Observe the outflow status of concrete in side pipe 5-3. When the concrete flows out steadily and continuously, close the side pipe valve and open the main valve 5-1 to allow the concrete to flow into the lower shell 1 and start timing.

[0055] (4) Keep the pump pressure stable and observe the rise of concrete in the lower shell 1. Record the time t1, t2, t3, and t4 when concrete emerges from each through hole A4-4 at the horizontal partition assembly 4, and calculate the sample standard deviation σ. t .

[0056] In this invention, there are four through holes A4-4, and the times t1, t2, t3, and t4 when concrete emerges from these four through holes A4-4 are recorded respectively.

[0057] Sample standard deviation σ t The calculation formula is: .

[0058] (5) When the concrete rises to the upper edge of the upper shell 3, immediately close the main valve 5-1 and the concrete pump, and then keep the through hole A4-4 of the horizontal partition assembly 4 closed by rotating the valve 4-1.

[0059] (6) Detect the concrete density ρ inside the upper shell 3 and the lower shell 1 respectively. 上 ρ 下 Calculate the density difference between the two. ρ.

[0060] (7) Based on the sample standard deviation σ t and density difference The calculated value of ρ is used to rate the jacking performance of concrete.

[0061] Using sample standard deviation σ t The rating method is as follows: if the standard deviation σ t A value ≥0.40 indicates poor jacking performance of the concrete; if the standard deviation σ t A standard deviation of σ = 0.30~0.40 indicates that the jacking performance of the concrete is qualified; if the standard deviation σ = 0.30~0.40, it indicates that the jacking performance of the concrete is qualified. t A value of 0.20~0.30 indicates good jacking performance of the concrete; the standard deviation σ t <0.20 indicates that the concrete has excellent lifting performance;

[0062] Using density difference The method for rating ρ is as follows: if the density difference ρ≥25 kg / m 3 When the density difference is high, it indicates poor jacking performance of the concrete; if the density difference is low... ρ is 15~25 kg / m 3 When the concrete's lifting performance is satisfactory, it indicates that the density difference is acceptable; if the density difference is not satisfactory, the concrete's lifting performance is acceptable. ρ is 5~15 kg / m 3 When the density difference is within a certain range, it indicates that the concrete has good lifting performance; if the density difference is too large... ρ < 5 kg / m 3 This indicates that the concrete has excellent lifting performance.

[0063] If the ratings obtained by the two rating methods are inconsistent, the lower rating shall prevail.

[0064] Table 1 Rating Methodology

[0065]

[0066] Four groups of self-compacting concrete were used as shown in Table 2. Slump expansion and U-shaped box height difference were tested according to CECS203:2006 "Technical Specification for Application of Self-Compacting Concrete". The results were compared and analyzed with the evaluation method described in this invention. The results are shown in Table 2.

[0067] Table 2. Test results of self-compacting concrete performance

[0068]

[0069] Slump / spread characterizes the flowability of concrete under its own weight without constraint, while the U-shaped box height characterizes the flowability and filling performance of concrete under its own weight. The data in Table 1 clearly shows that concrete D has the highest slump / spread, indicating the best flowability; concrete A has the smallest measured U-shaped box height difference, indicating good filling performance; and concrete C has a larger measured U-shaped box height difference, indicating poor filling performance. According to the device and method of this invention, concrete A has excellent jacking construction performance, concrete B has qualified jacking construction performance, concrete C has poor jacking construction performance, and concrete D has poor jacking construction performance.

[0070] Analysis revealed that concrete C, due to its relatively poor fluidity, experienced slower flow into the cavities through the openings during jacking, resulting in inconsistent concrete rising rates within each cavity. This was addressed by the σ detected by this invention. t The value is also too high; the concrete has good fluidity, but poor uniformity. Analysis of the paste and aggregate occurs. During concrete jacking, crushed stone accumulates at the bottom and blocks some openings, preventing concrete from flowing normally into other cavities. Simultaneously, during jacking, aggregate accumulates in the lower layer while the paste remains in the upper layer, leading to… If the ρ value is too large, the jacking performance of concrete D is poor. In summary, the testing device and evaluation method provided by this invention consider the concrete's ability to pass through pores during jacking and its rising state in each cavity, and can evaluate the uniformity of the concrete after jacking. Its testing and evaluation results are more accurate and applicable. The basic principles, main features, and advantages of this invention have been shown and described above.

[0071] It should be understood that the above are merely some embodiments of the present invention and are not intended to limit the present invention. Therefore, any changes and improvements to the above embodiments should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for evaluating the performance of concrete jacking construction, characterized in that, The method is as follows: (1) Provide each component of the concrete jacking construction performance testing system, and check the sealing of the pipeline after connection; (2) After mixing the concrete, load it into the placing hopper of the concrete pump and turn on the concrete pump. (3) Observe the outflow status of the concrete in the side pipe. When the concrete flows out steadily and continuously, close the side valve and open the main valve at the same time to let the concrete flow into the lower shell and start timing. (4) Keep the pump pressure stable and observe the rise of concrete in the lower shell. Record the time t1, t2, t3, and t4 when concrete emerges from each through hole A at the horizontal partition assembly, and calculate the sample standard deviation σ. t ; (5) When the concrete rises to the upper edge of the upper shell, immediately close the main valve and the concrete pump, and then keep the through hole A of the horizontal diaphragm assembly closed by rotating the valve. (6) Detect the concrete density ρ inside the upper and lower shells respectively. 上 ρ 下 Calculate the density difference between the two. ρ; (7) Based on the sample standard deviation σ t and density difference The calculated value of ρ is used to rate the jacking performance of concrete. Using sample standard deviation σ t The rating method is as follows: if the standard deviation σ t A value ≥0.40 indicates poor jacking performance of the concrete; if the standard deviation σ t A standard deviation of σ = 0.30~0.40 indicates that the jacking performance of the concrete is qualified; if the standard deviation σ = 0.30~0.40, it indicates that the jacking performance of the concrete is qualified. t A value of 0.20~0.30 indicates good jacking performance of the concrete; the standard deviation σ t <0.20 indicates that the concrete has excellent lifting performance; Using density difference The method for rating ρ is as follows: if the density difference ρ≥25 kg / m 3 When the density difference is high, it indicates poor jacking performance of the concrete; if the density difference is low... ρ is 15~25 kg / m 3 When the concrete's lifting performance is satisfactory, it indicates that the density difference is acceptable; if the density difference is not satisfactory, the concrete's lifting performance is acceptable. ρ is 5~15 kg / m 3 When the density difference is within a certain range, it indicates that the concrete has good lifting performance; if the density difference is too large... ρ < 5 kg / m 3 This indicates that the concrete has excellent lifting performance; The concrete jacking construction performance testing system includes a concrete jacking construction performance testing device, a pump pipe, and a concrete pump. The main pipeline of the testing device is connected to the outlet of the concrete pump through the pump pipe, and the concrete pump's hopper is used to load concrete. The concrete jacking construction performance testing device includes an upper shell, a lower shell, a horizontal partition assembly, and a main pipeline; The upper shell is continuous from top to bottom; the lower shell has an opening at the top. The upper housing is mounted on top of the lower housing, and the upper housing and the lower housing are separated by a horizontal partition assembly, which is fixed to the lower port of the upper housing. The horizontal partition assembly has a through hole A, which connects the upper housing and the lower housing. The horizontal partition assembly is also equipped with a rotary valve for controlling the opening and closing of the through hole A. The lower housing is provided with a main pipe connecting to the interior of the lower housing, and a main valve is installed on the main pipe; a side pipe is connected to the main pipe, and a side valve is installed on the side pipe.

2. The method for evaluating the performance of concrete jacking construction as described in claim 1, characterized in that, The horizontal partition assembly includes an upper partition and a lower partition that are fitted together, and the upper partition and the lower partition each have a corresponding through hole A. The rotary valve includes a valve stem, the lower end of which is connected to the upper partition and can drive the upper partition to rotate horizontally relative to the lower partition. When the upper partition rotates until the through hole A of the upper partition is completely misaligned with the through hole A of the lower partition, the through hole A of the horizontal partition assembly is closed, and the upper and lower housings are not connected. When the upper partition rotates until the through hole A of the upper partition overlaps with the through hole A of the lower partition, the upper and lower housings are connected.

3. The method for evaluating the performance of concrete jacking construction as described in claim 1, characterized in that, The lower housing is equipped with multiple vertical partitions, which uniformly divide the interior of the lower housing into multiple chambers; each chamber is connected to the upper housing through a through hole A on the horizontal partition assembly.

4. The method for evaluating the performance of concrete jacking construction as described in claim 3, characterized in that, The two adjacent chambers are connected by a through hole B in the vertical partition.

5. The method for evaluating the performance of concrete jacking construction as described in claim 1, characterized in that, The main valve on the main pipeline is located downstream of the side pipeline.

6. The method for evaluating the performance of concrete jacking construction as described in claim 1, characterized in that, The lower outer wall of the upper housing is provided with several buckles spaced apart circumferentially. The buckles can be fastened to the fixing rod, which is located on the upper outer wall of the lower housing.

7. The method for evaluating the performance of concrete jacking construction as described in claim 1, characterized in that, The upper inner edge of the lower housing is recessed to form a mounting groove, and a sealing rubber ring is provided in the mounting groove; the bottom of the upper housing is located in the mounting groove.

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