An axial force monitoring system for a super-thick floor support frame and a verification method for demolition conditions

Abstract

The present invention relates to an axial force monitoring system for a super-thick floor support frame and a method for verifying the demolition conditions thereof. Specifically, the axial force monitoring system includes a super-thick floor support frame (5) and an axial force monitoring device; the axial force monitoring device is used to monitor the axial force of the super-thick floor support frame; the axial force monitoring device includes an adjustable jack (6), a jack (7), an axial force sensing line (8) and a data acquisition instrument (9). The method for verifying the demolition conditions of the thick floor support frame of the present invention can accurately determine whether the support frame bears the pressure of the upper floor concrete by installing an axial force monitoring device at the top of the super-thick floor support frame, so as to timely determine whether the support frame can be demolished, thereby reducing the waste of costs.

Description

Technical Field

[0001] The present invention belongs to the field of building construction, and specifically relates to an axial force monitoring system for a support frame of a super-thick floor slab and a method for verifying the demolition conditions. Background Art

[0002] During the construction of a super-thick concrete floor slab, due to the large volume and self-weight of the concrete, the bearing capacity requirements for the concrete formwork support frame are high. To meet the bearing capacity requirements, there are usually two methods. One is to adjust factors such as the spacing of the vertical poles of the frame to improve the bearing capacity of the frame; the other is to pour the super-thick floor slab in layers. After the concrete of the lower floor slab reaches a certain strength, the lower floor slab is used as a formwork to jointly bear the load of the concrete of the upper floor slab with the support frame. After the concrete of the upper floor slab is poured, they form a whole together. When the super-thick concrete floor slab is poured in layers, usually the lower floor slab can already support the load of the upper floor slab alone, so the support frame is not needed. However, often because it is impossible to verify whether the support frame can be demolished, the turnover time of the support frame is long, resulting in waste of materials and an increase in costs.

[0003] Therefore, there is a need in the art to develop a method for verifying the demolition conditions of a support frame for a super-thick floor slab so as to be able to demolish the support frame in time, thereby achieving the purpose of cost savings. Summary of the Invention

[0004] In order to overcome the problems existing in the prior art, the present invention aims to provide an axial force monitoring system for a support frame of a super-thick floor slab and a method for verifying the demolition conditions of the support frame of the super-thick floor slab.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] There is provided an axial force monitoring system for a support frame of a super-thick floor slab. The axial force monitoring system includes a support frame 5 and an axial force monitoring device. The axial force monitoring device is used to monitor the axial force of the support frame. The support frame is used to support the super-thick floor slab and the formwork for pouring the super-thick floor slab.

[0007] The axial force monitoring device includes an adjustable jack 6, a jack 7, an axial force sensing wire 8, and a data acquisition instrument 9. The adjustable jack is installed at the top of the support frame to be monitored. The jack is installed below the adjustable jack and can tighten or loosen the adjustable jack. At the same time, the jack is connected to the axial force sensing wire, and the axial force sensing wire is connected to the data acquisition instrument. The data acquisition instrument is used to read the axial force value of the support frame to be monitored. The axial force monitoring device can load or unload by adjusting the jack.

[0008] Preferably, the formwork for pouring the super-thick floor slab includes a side formwork 1 and a bottom formwork 2. The side formwork 1 and the bottom formwork 2 form a space for pouring the floor slab concrete.

[0009] Preferably, a main beam 4 and a secondary beam 3 are further included between the formwork for pouring the ultra-thick floor slab and the support frame; the secondary beam 3 is installed below the bottom formwork 2 and is used to support the formwork for pouring the ultra-thick floor slab; the main beam 4 is installed below the secondary beam 3 and is used to support the secondary beam 3.

[0010] Preferably, the support frame is installed below the main beam; the adjustable jack is installed at the top of the support frame and below the main beam.

[0011] Preferably, the data collector is installed outside the support frame.

[0012] Preferably, all the support frames are evenly distributed.

[0013] Preferably, every 4 support frames form a 600mm * 600mm square.

[0014] Preferably, the data collector can respectively display the axial forces of the support frames to be monitored; the support frames to be monitored are all or part of the support frames in the support frame.

[0015] Preferably, the support frames to be monitored are part of the support frames in the support frame; the part of the support frames is located in the mid-span area of the concrete of the lower floor slab.

[0016] Preferably, the part of the support frames is 3 - 5 support frames.

[0017] A method for verifying the removal conditions of the support frame for the ultra-thick floor slab is further provided, and the verification method includes the following steps:

[0018] (1) Install the above-mentioned axial force monitoring system for the support frame of the ultra-thick floor slab;

[0019] (2) After installation, pour the concrete of the lower floor slab in the formwork for pouring the ultra-thick floor slab;

[0020] (3) After the concrete of the lower floor slab has set, use the concrete of the lower floor slab as the formwork to pour the concrete of the upper floor slab;

[0021] (4) The axial force monitoring device unloads the load by adjusting the jack, and reads the axial force value on the data collector while unloading;

[0022] (5) Judge whether the support frame bears the load of the concrete of the upper floor slab together with the concrete of the lower floor slab through the axial force value; if the axial force value is not zero, it means that the support frame still bears the load of the concrete of the upper floor slab, then the support frame cannot be removed; if the axial force value is zero, it means that the support frame does not bear the load of the concrete of the upper floor slab, then the support frame can be removed.

[0023] Preferably, in step (4), the axial force monitoring device unloads the load by loosening the jack, and reads the axial force value on the data collector while unloading.

[0024] A method for adjusting the concrete strength of the lower floor slab to fully bear the concrete of the upper floor slab is also provided, including the following steps:

[0025] (a) Install the above-mentioned axial force monitoring system for the ultra-thick floor slab support frame;

[0026] (b) After installation, in the formwork used for pouring the ultra-thick floor slab, pour the concrete of the lower floor slab;

[0027] (c) After the concrete of the lower floor slab has finally set, use the concrete of the lower floor slab as the formwork to pour the concrete of the upper floor slab;

[0028] (d) The axial force monitoring device unloads by adjusting the jack, and reads the axial force value on the data acquisition instrument while unloading;

[0029] (e) When the axial force value is not zero, the axial force monitoring device loads again by adjusting the jack, and waits for the strength of the concrete of the lower floor slab to increase with the age of time. During the waiting period, regularly return to step (d);

[0030] (f) Repeat steps (d) and (e) until the axial force value is zero, which means that the concrete strength of the lower floor slab can fully bear the concrete of the upper floor slab.

[0031] Preferably, in step (d), the axial force monitoring device unloads by loosening the jack, and reads the axial force value on the data acquisition instrument while unloading.

[0032] Preferably, in step (e), the regular return to step (d) is to return to step (d) once every 24 hours.

[0033] The beneficial effects brought by the technical solution of the present invention include:

[0034] By installing an axial force monitoring device at the top of the ultra-thick floor slab support frame and reading the axial force value of the support frame according to the verification method of the present invention, it can accurately judge whether the support frame bears the concrete of the upper floor slab. When the axial force value of the support frame is zero, the support frame can be removed in time for turnover use, thereby greatly reducing the waste of costs. Description of the Drawings

[0035] Figure 1 is a flow chart of the verification method of the present invention.

[0036] Figure 2 is a schematic diagram of the axial force monitoring system of the present invention.

[0037] Figure 3 is a partial enlarged schematic diagram of the axial force monitoring system.

[0038] In the figure,

[0039] 1: Side formwork

[0040] 2: Bottom formwork

[0041] 3: Secondary beam

[0042] 4: Main beam

[0043] 5: Support frame

[0044] 6: Adjustable top bracket

[0045] 7: Jack

[0046] 8: Axial force sensing line

[0047] 9: Data acquisition instrument

[0048] 10: Lower floor slab concrete

[0049] 11: Upper floor slab concrete. Detailed implementation method

[0050] The present invention will be further described below in conjunction with specific drawings.

[0051] In order to verify whether the support frame of the super-thick floor slab can be demolished during the layered pouring of the super-thick floor slab, the present invention provides an axial force monitoring system for the support frame of the super-thick floor slab and a verification method for the demolition conditions of the support frame of the super-thick floor slab realized by using this axial force monitoring system. This method determines whether the support frame of the super-thick floor slab can be demolished by monitoring the load of the support frame during the layered pouring of the super-thick floor slab.

[0052] The installation of the axial force monitoring system for the support frame of the super-thick floor slab of the present invention is as shown in Figure 2 and Figure 3 shown.

[0053] The axial force monitoring system for the support frame of the super-thick floor slab of the present invention includes a support frame 5 and an axial force monitoring device. The support frame is used to support the super-thick floor slab and the formwork for pouring the super-thick floor slab.

[0054] The layout spacing of the support frame is determined according to the load calculation of the lower floor slab concrete 11, generally 600mm * 600mm, that is, every 4 vertical poles form a 600mm * 600mm square.

[0055] The formwork for pouring the super-thick floor slab includes a side formwork 1 and a bottom formwork 2; the side formwork and the bottom formwork form a space for pouring the floor slab concrete.

[0056] Between the formwork for pouring the super-thick floor slab and the support frame, there are also main beams 4 and secondary beams 3; the secondary beams are installed under the bottom formwork and are used to support the formwork for pouring the super-thick floor slab; the main beams are installed under the secondary beams and are used to support the secondary beams. The support frame is installed under the main beams.

[0057] The formwork for pouring the super-thick floor slab is used to pour the concrete of the lower floor slab and the upper floor slab. The side formwork is wooden formwork. The bottom formwork is wooden formwork. The secondary beams are wooden square secondary beams. The main beams are steel main beams, specifically 10# I-beam main beams.

[0058] The axial force monitoring device is used to monitor the axial force of the support frame of the above-mentioned super-thick floor slab. The axial force monitoring device includes an adjustable jack 6, a jack 7, an axial force sensing wire 8, and a data acquisition instrument 9. The adjustable jack is installed at the top of the support frame to be monitored and under the main beam and is used to support the main beam. The jack is installed under the adjustable jack in a tight or loose manner; at the same time, the jack is connected to the axial force sensing wire, and the axial force sensing wire is connected to the data acquisition instrument arranged outside the support frame, and the data acquisition instrument is used to read the axial force value.

[0059] The axial force monitoring device can load by adjusting the jack to tighten the adjustable jack, or unload by adjusting the jack to loosen the adjustable jack.

[0060] Regarding the selection of the support rods to be monitored, generally select the mid-span area of the concrete of the lower floor slab, that is, the center of the entire support frame area. Generally, in the entire support frame area, the number of support rods to be monitored is generally selected as 3 - 5.

[0061] The flow of the verification method for the demolition conditions of the support frame of the super-thick floor slab of the present invention is as Figure 1 shown. Specifically, the verification method includes the following steps:

[0062] (1) Install the axial force monitoring system of the support frame of the super-thick floor slab of the present invention;

[0063] (2) After installation, in the formwork for pouring the super-thick floor slab, pour the concrete 10 of the lower floor slab;

[0064] (3) After the concrete of the lower floor slab has finally set, use the concrete of the lower floor slab as the formwork and pour the concrete 11 of the upper floor slab;

[0065] (4) The axial force monitoring device unloads by adjusting the jack, and reads the axial force value on the data acquisition instrument while unloading;

[0066] (5) Determine whether the support frame bears the load of the upper floor concrete together with the lower floor concrete through the axial force value; if the axial force value is not zero, it means that the support frame still bears the load of the upper floor concrete, then the support frame cannot be removed; if the axial force value is zero, it means that the support frame does not bear the load of the upper floor concrete, then the support frame can be removed.

[0067] The present invention also provides a method for adjusting the strength of the lower floor concrete to fully bear the upper floor concrete. The process of this method is as Figure 1 shown. Specifically, this method includes the following steps:

[0068] (a) Install the axial force monitoring system for the support frame of the super-thick floor of the present invention;

[0069] (b) After installation, pour the lower floor concrete;

[0070] (c) After the lower floor concrete has finally set, use the lower floor concrete as a formwork to pour the upper floor concrete;

[0071] (d) The axial force monitoring device unloads by adjusting the jack, and reads the axial force value on the data acquisition instrument while unloading;

[0072] (e) When the axial force value is not zero, the axial force monitoring device loads again by adjusting the jack, and waits for the strength of the lower floor concrete to increase with the time age. During the waiting period, return to step (d) once every 24 hours;

[0073] (f) Repeat steps (d) and (e) until the axial force value is zero, which means that the strength of the lower floor concrete can fully bear the upper floor concrete.

[0074] By installing an axial force monitoring device at the top of the support vertical rod of the support frame of the super-thick floor, it is possible to accurately determine whether the support frame bears the upper floor concrete, so that the support frame can be removed in time, reducing the waste of costs.

[0075] Embodiment

[0076] As Figure 1 shown, verify the removal conditions of the support frame according to the process.

[0077] (1) As Figure 2 and Figure 3 shown, install the axial force monitoring system for the support frame of the super-thick floor of the present invention.

[0078] The formwork for pouring the ultra-thick floor slab includes side formwork and bottom formwork; the side formwork and the bottom formwork form a space for pouring the floor slab concrete. Under the bottom formwork, secondary wooden beams are installed, and under the secondary wooden beams, 10# I-beam main beams are installed. Under the main beams and on the tops of 5 support frames at the center of the entire support frame area, adjustable jackscrews are installed. The jacks are installed in a tight or loose manner under the adjustable jackscrews; at the same time, the jacks are connected to axial force sensing lines, and the axial force sensing lines are connected to a data acquisition instrument arranged outside the support frame, and the data acquisition instrument is used to read the axial force value.

[0079] The axial force monitoring device can load by adjusting the jack to tighten the adjustable support top, or unload by adjusting the jack to loosen the adjustable support top.

[0080] (2) After installation, first, tighten the jack against the adjustable tray, and then, in the formwork for pouring the ultra-thick floor slab, pour the concrete of the lower floor slab.

[0081] (3) After 10 days, the concrete of the lower floor slab reaches final setting and its compressive strength reaches 22.5 MPa. Using the lower layer of concrete as the formwork, pour the concrete of the upper floor slab. Three days after the pouring of the upper floor slab concrete is completed, step (4) is implemented.

[0082] (4) The axial force monitoring device unloads by loosening the jack, and reads the axial force value on the data acquisition instrument while unloading;

[0083] (5) The result shows that the maximum axial force value is 160 MPa, then the lower concrete floor slab cannot fully support the load of the upper concrete floor slab. At this time, tighten the jack against the adjustable tray again, and wait for the strength of the lower concrete to increase with the age. Then, return to step (4) at 24-hour intervals, and repeat steps (4) and (5) until the maximum axial force value is 0, then the lower concrete floor slab fully supports the load of the upper concrete floor slab, and the support frame can be removed.

[0084] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those skilled in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A monitoring system for axial force of a support frame for super-thick floor slabs, characterized in that, the axial force monitoring system includes a support frame (5) and an axial force monitoring device; the axial force monitoring device is used to monitor the axial force of the support frame (5); the support frame (5) is used to support the super-thick floor slab and the formwork for pouring the super-thick floor slab; the formwork for pouring the super-thick floor slab includes a side formwork (1) and a bottom formwork (2); the side formwork (1) and the bottom formwork (2) form a space for pouring the floor slab concrete; the super-thick floor slab is poured in layers, and the layered pouring divides the super-thick floor slab into a lower layer of floor slab concrete (10) and an upper layer of floor slab concrete (11); the support frame (5) is selected in the mid-span area of the lower layer of floor slab concrete (10), and 3 - 5 are selected; between the formwork for pouring the super-thick floor slab and the support frame (5), there are also a main beam (4) and a secondary beam (3); the secondary beam (3) is installed below the bottom formwork (2) and is used to support the formwork for pouring the super-thick floor slab; the main beam (4) is installed below the secondary beam (3) and is used to support the secondary beam (3); the support frame (5) is installed below the main beam (4); the axial force monitoring device includes an adjustable jack (6), a jack (7), an axial force sensing wire (8) and a data acquisition instrument (9); the adjustable jack (6) is installed at the top of the support frame (5) to be monitored and below the main beam (4); the jack (7) is installed below the adjustable jack (6) and can tighten or loosen the adjustable jack (6); at the same time, the jack (7) is connected to the axial force sensing wire (8), and the axial force sensing wire (8) is connected to the data acquisition instrument (9), and the data acquisition instrument (9) is used to read the axial force value of the support frame (5) to be monitored; by the axial force value, it is judged whether the support frame (5) and the lower layer of floor slab concrete (10) jointly bear the load of the upper layer of floor slab concrete (11), and the axial force monitoring device can load or unload by adjusting the jack (7).

2. The monitoring system for axial force of a support frame for super-thick floor slabs according to claim 1, characterized in that, the data acquisition instrument (9) is installed outside the support frame (5).

3. A method for verifying the removal conditions of a support frame for super-thick floor slabs, characterized in that, the verification method includes the following steps: (1) Install the monitoring system for axial force of a support frame for super-thick floor slabs according to any one of claims 1 - 2; (2) After installation, in the formwork for pouring the super-thick floor slab, pour the lower layer of floor slab concrete (10); (3) After the lower layer of floor slab concrete (10) has set, use the lower layer of floor slab concrete (10) as the formwork and pour the upper layer of floor slab concrete (11); (4) The axial force monitoring device unloads by adjusting the jack (7), and reads the axial force value on the data acquisition instrument (9) while unloading. (5) Determine whether the support frame (5) bears the load of the upper floor concrete together with the lower floor slab concrete (10) based on the axial force value; if the axial force value is not zero, it indicates that the support frame (5) still bears the load of the upper floor concrete (11), and then the support frame (5) cannot be removed; if the axial force value is zero, it indicates that the support frame (5) does not bear the load of the upper floor concrete (11), and then the support frame (5) can be removed.

4. The method for verifying the demolition condition of the support frame for the super-thick floor slab as described in claim 3, characterized in that, in step (4), the axial force monitoring device unloads by loosening the jack (7), and reads the axial force value on the data acquisition instrument (9) while unloading.

5. A method for adjusting the strength of the lower floor slab concrete to fully bear the load of the upper floor slab concrete, characterized in that, comprises the following steps: (a) Install the axial force monitoring system of the support frame for the super-thick floor slab as described in any one of claims 1-2; (b) After installation, pour the lower floor slab concrete (10) in the formwork used for pouring this super-thick floor slab; (c) After the lower floor slab concrete (10) has finally set, use the lower floor slab concrete (10) as the formwork to pour the upper floor slab concrete (11); (d) The axial force monitoring device unloads by loosening the jack (7), and reads the axial force value on the data acquisition instrument (9) while unloading; (e) When the axial force value is not zero, the axial force monitoring device loads again by adjusting the jack (7), and wait for the strength of the lower floor slab concrete (10) to increase with the time age, and regularly return to step (d) during the waiting period; (f) Repeat steps (d) and (e) until the axial force value is zero, which means that the strength of the lower floor slab concrete (10) can fully bear the load of the upper floor slab concrete (11).

6. The method for adjusting the strength of the lower floor slab concrete to fully bear the load of the upper floor slab concrete as described in claim 5, characterized in that, in step (e), the regular return to step (d) is to return to step (d) once every 24 hours.

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