A horizontal bracing axial force regulation method based on enclosure deformation control

Abstract

This invention discloses a method for controlling the axial force of horizontal supports based on deformation control of the retaining area, comprising the following steps: deploying image acquisition devices to monitor the deformation of the foundation pit retaining; dividing the area of ​​action of the horizontal supports along the depth and width of the foundation pit according to the location of the horizontal supports; uniformly dividing the t-th horizontal support of the s-th layer into n rows along the height of action and m columns along the width of action; and calculating the deformation record w of the foundation pit retaining area in the i-th row and j-th column region based on the deformation data monitored in step one. ij The value of w; calculate w st Based on the deformation value w of the enclosure structure st The change in axial force of the support is calculated and denoted as Δp. This invention uses the measured deformation of the retaining structure within the range of action of each horizontal support as the basis for adjusting the axial force of the support. This overcomes the shortcomings of previous methods that used lines to represent surfaces for the deformation of the foundation pit retaining structure, and can more accurately reflect the needs for axial force adjustment. This makes the adjustment of the axial force deformation of the support closer to the actual situation on site, thereby ensuring the safety of the foundation pit project.

Description

Technical Field

[0001] This invention relates to a method for adjusting the axial force of horizontal supports based on deformation control of the retaining area, belonging to the field of foundation pit retaining deformation control. Background Technology

[0002] Currently, the axial force control of steel supports is based on two control factors: hydraulic cylinder pressure of the jacks and deformation of the retaining wall. Among them, the deformation of the retaining wall in the foundation pit is mainly obtained by inclinometer monitoring. This method has the drawback of substituting lines for surfaces and cannot accurately reflect the true deformation of the retaining wall within the range of action of the steel supports. Therefore, there is a certain deviation between the axial force control of the steel supports and the actual deformation control, making it difficult to achieve the effect of active control of the deformation of the foundation pit retaining wall. Summary of the Invention

[0003] To address the shortcomings of existing steel support axial force control methods that rely on both jack cylinder pressure and retaining deformation for accurate reflection of the actual deformation within the steel support's effective range, this invention proposes a horizontal support axial force control method based on retaining area deformation control. This method better reflects the actual site conditions and ensures the safety of the foundation pit project.

[0004] To solve the above technical problems, the present invention includes the following technical solutions:

[0005] A method for regulating the axial force of horizontal supports based on deformation control of the enclosure area includes the following steps:

[0006] Step 1: Deploy image acquisition devices to monitor the deformation of the foundation pit retaining wall;

[0007] Step 2: Based on the location of the horizontal supports, divide the area of ​​effect of the horizontal supports along the depth and width of the excavation pit. A total of S layers of horizontal supports are installed along the depth of the excavation pit, and T horizontal supports are installed in the s-th layer. The effective height of the t-th horizontal support in the s-th layer is denoted as H. st The effective width is denoted as B. st Where s = 1, 2, ..., S, t = 1, 2, ..., T;

[0008] Step 3: The horizontal support of the s-th layer and the t-th layer is uniformly divided into n rows along the working height and m columns along the working width. The deformation of the foundation pit retaining wall in the area of ​​the i-th row and j-th column is denoted as w. ij Where 1≤i≤n, 1≤j≤m, based on the deformation data monitored in step one, calculate the average value of the deformation within the area of ​​the i-th row and j-th column, and use it as w. ij The value;

[0009] Step 4: The deformation of the retaining structure within the area affected by the t-th horizontal support of the s-th layer is denoted as w. st w stTake the arithmetic mean of the surface deformations within the effective range of the t-th horizontal support of the s-th layer, where,

[0010]

[0011] Step 5: Based on the deformation value w of the enclosure structure st The axial force of the t-th horizontal support in the s-th layer is adjusted, and the change in the axial force is denoted as Δp, where Δp = k × w st , where k is the support axial force adjustment coefficient considering the temperature effect of the horizontal support.

[0012] Furthermore, the distance between the s-th layer and the (s-1)-th layer is denoted as H. s-1,s The distance between the s-th layer and the (s+1)-th layer is denoted as H. s,s+1 The effective height of the horizontal support at the t-th level of the s-th layer is denoted as H. st , where H st =(H s-1,s +H s,s+1 ) / 2, where s=2,3,…,S-1;

[0013] The effective height of the first layer, t-th horizontal support is H. 1t H 1t =H 0,1 +H 1,2 / 2, where H 0,1 This is the distance from the first layer of horizontal support to the top of the foundation pit;

[0014] The effective height of the t-th horizontal support in the S-th layer is H. St H St =H S,S+1 +H S-1,S / 2,H S,S+1 The distance from the horizontal support of the Sth layer to the bottom of the foundation pit.

[0015] Furthermore, the distance between the t-th horizontal support of the s-th layer and the (t-1)-th horizontal support of the s-th layer is denoted as B. t-1,t The distance between the t-th horizontal support and the (t+1)-th horizontal support is denoted as B. t,t+1 The effective width of the horizontal support at the t-th level of the s-th layer is denoted as B. st B st = (B t-1,t +B t,t+1 ) / 2, where t=2,3,…,T-1;

[0016] Let B be the width of the first horizontal support in the s-th layer. s1 B s1 =B 0,1 +B 1,2 / 2, B 0,1The distance from the first horizontal support to the nearest end of the foundation pit;

[0017] Let B be the width of the horizontal support of the s-th layer and the T-th channel. sT B sT =B T,T+1 +B T-1,T / 2, B T,T+1 Let T be the distance from the Tth horizontal support to the nearest end of the foundation pit.

[0018] The present invention, by adopting the above technical solution, has the following advantages and positive effects compared with the prior art: The present invention uses the measured deformation of the retaining structure within the range of each horizontal support as the basis for the control of the support axial force, which overcomes the shortcomings of the previous method of using lines to represent surfaces for the deformation of the foundation pit retaining structure. It can more realistically reflect the needs of axial force control, making the control of the support axial force deformation closer to the actual situation on site, thereby ensuring the safety of the foundation pit project. Attached Figure Description

[0019] Figure 1 This is a flowchart of a horizontal support axial force control method based on enclosure area deformation control in one embodiment of the present invention;

[0020] Figure 2 This is a longitudinal sectional view of the enclosure structure and horizontal support in one embodiment of the present invention;

[0021] Figure 3 This is a cross-sectional view of the enclosure structure and horizontal support in one embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the zonal deformation within the effective range of the st-th horizontal support in one embodiment of the present invention.

[0023] The numbers in the diagram are as follows:

[0024] 1- Enclosure structure; 2- Horizontal support. Detailed Implementation

[0025] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a method for adjusting the axial force of horizontal supports based on deformation control of the enclosure area, according to the present invention. The advantages and features of the present invention will become clearer with the following description. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0026] like Figure 1 As shown in the figure, the horizontal support axial force control method based on enclosure area deformation control provided in this embodiment includes the following steps:

[0027] Step 1: Deploy image acquisition devices to monitor the deformation of the foundation pit retaining wall.

[0028] As an example, the image acquisition device can be a laser 3D scanner to monitor the deformation of the foundation pit retaining structure at a certain frequency. The image processing method can be used to compare the 3D images of the foundation pit retaining structure monitored twice to obtain the overall deformation data of the foundation pit retaining structure.

[0029] Step 2: Based on the location of the horizontal supports, delineate the area of ​​effect of the horizontal supports along the depth and plane of the excavation pit. Horizontal supports are typically steel supports or reinforced concrete supports.

[0030] like Figure 2 As shown, a total of S layers of horizontal supports are installed along the depth of the foundation pit, and T horizontal supports are installed in the s-th layer. The distance between the s-th layer and the (s-1)-th layer is denoted as H. s-1,s The distance between the s-th layer and the (s+1)-th layer is denoted as H. s,s+1 The effective height of the horizontal support at the t-th level of the s-th layer is denoted as H. st , where H st =(H s-1,s +H s,s+1 ) / 2, where s=2,3,…,S-1. The effective height of the horizontal support of the t-th horizontal support in the first layer is H. 1t H 1t =H 0,1 +H 1,2 / 2, where H 0,1 H is the distance from the first layer of horizontal supports to the top of the foundation pit. The effective height of the t-th horizontal support in the S-th layer is H. St H St =H S,S+1 +H S-1,S / 2,H S,S+1 The distance from the horizontal support of the Sth layer to the bottom of the foundation pit.

[0031] Combination Figures 2 to 3 As shown, the distance between the t-th horizontal support of the s-th layer and the (t-1)-th horizontal support of the s-th layer is denoted as B. t-1,t The distance between the t-th horizontal support and the (t+1)-th horizontal support is denoted as B. t,t+1 The effective width of the horizontal support at the t-th level of the s-th layer is denoted as B. st B st = (B t-1,t +B t,t+1 ) / 2, where t=2,3,…,T-1. The effective width of the first horizontal support of the s-th layer is denoted as B. s1 B s1 =B 0,1 +B 1,2 / 2, B 0,1 Let B be the distance from the first horizontal support to the nearest end of the excavation pit. The effective width of the T-th horizontal support in the s-th layer is denoted as B.sT B sT =B T,T+1 +B T-1,T / 2, B T,T+1 Let T be the distance from the Tth horizontal support to the nearest end of the foundation pit.

[0032] Combination Figures 2 to 3 As shown, the effective area of ​​the t-th horizontal support in the s-th layer is S, where S = H. st ×B st .

[0033] Step 3: The effective area of ​​the t-th horizontal support in the s-th layer is uniformly divided into n rows and m columns along the height and width directions. The deformation of the foundation pit retaining wall in the area of ​​the i-th row and j-th column is denoted as w. ij Where 1≤i≤n, 1≤j≤m. The area of ​​the region in the i-th row and j-th column is... Based on the deformation data monitored in step one, calculate the area S. ij The average value of the deformation within the range, and make w ij Take this average value, w ij This represents the overall deformation of the region in the i-th row and j-th column.

[0034] Step 4: The deformation of the retaining structure within the area affected by the t-th horizontal support of the s-th layer is denoted as w. st w st Take the arithmetic mean of the deformations of all regions, that is,

[0035]

[0036] Step 5: Based on the deformation value w of the enclosure structure area st The axial force of the horizontal support is adjusted, and the change in the axial force is recorded as Δp, where p = k × w st , where k is the support axial force adjustment coefficient considering the temperature effect of the horizontal support.

[0037] The more surface units and the smaller the area of ​​each unit within the horizontal support region using this method, the closer the obtained regional deformation will be to the actual deformation. In practice, it is necessary to consider the balance between accuracy and efficiency, and to improve the efficiency of data processing as much as possible while meeting the accuracy requirements.

[0038] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0039] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A method for adjusting the axial force of horizontal supports based on deformation control of the enclosure area, characterized in that, Includes the following steps: Step 1: Deploy image acquisition devices to monitor the deformation of the foundation pit retaining wall; Step 2: Based on the location of the horizontal supports, divide the area of ​​effect of the horizontal supports along the depth and width of the excavation pit. A total of S layers of horizontal supports are installed along the depth of the excavation pit, and T horizontal supports are installed in the s-th layer. The effective height of the t-th horizontal support in the s-th layer is denoted as H. st The effective width is denoted as B. st Where s = 1, 2, ..., S, t = 1, 2, ..., T; Step 3: The horizontal support of the s-th layer and the t-th layer is uniformly divided into n rows along the working height and m columns along the working width. The deformation of the foundation pit retaining wall in the area of ​​the i-th row and j-th column is denoted as w. ij Where 1≤i≤n, 1≤j≤m, based on the deformation data monitored in step one, calculate the average value of the deformation within the area of ​​the i-th row and j-th column, and use it as w. ij The value; Step 4: The deformation of the retaining structure within the area affected by the t-th horizontal support of the s-th layer is denoted as w. st w st Take the arithmetic mean of the surface deformations within the effective range of the t-th horizontal support of the s-th layer, where, Step 5: Based on the deformation value w of the enclosure structure st The axial force of the t-th horizontal support in the s-th layer is adjusted, and the change in the axial force is denoted as Δp, where Δp = k × w st , where k is the support axial force adjustment coefficient considering the temperature effect of the horizontal support.

2. The horizontal support axial force adjustment method based on enclosure area deformation control as described in claim 1, characterized in that, The distance between the s-th layer and the (s-1)-th layer is denoted as H. s-1,s The distance between the s-th layer and the (s+1)-th layer is denoted as H. s,s+1 The effective height of the horizontal support at the t-th level of the s-th layer is denoted as H. st , where H st =(H s-1,s +H s,s+1 ) / 2, where s=2,3,…,S-1; The height of the first layer, t-th horizontal support is H. 1t H 1t =H 0,1 +H 1,2 / 2, where H 0,1 This is the distance from the first layer of horizontal support to the top of the foundation pit; The effective height of the t-th horizontal support in the S-th layer is H. St H St =H S,S+1 +H S-1,S / 2,H S,S+1 The distance from the horizontal support of the Sth layer to the bottom of the foundation pit.

3. The horizontal support axial force adjustment method based on enclosure area deformation control as described in claim 2, characterized in that, The distance between the t-th horizontal support of the s-th layer and the (t-1)-th horizontal support of the s-th layer is denoted as B. t-1,t The distance between the t-th horizontal support and the (t+1)-th horizontal support is denoted as B. t,t+1 The effective width of the horizontal support at the t-th level of the s-th layer is denoted as B. st B st = (B t-1,t +B t,t+1 ) / 2, where t=2,3,…,T-1; Let B be the width of the first horizontal support in the s-th layer. s1 B s1 =B 0,1 +B 1,2 / 2, B 0,1 The distance from the first horizontal support to the nearest end of the foundation pit; Let B be the width of the horizontal support of the s-th layer and the T-th channel. sT B sT =B T,T+1 +B T-1,T / 2, B T,T+1 Let T be the distance from the Tth horizontal support to the nearest end of the foundation pit.

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