A deformation-adjusting support structure for diaphragm walls of foundation pits and its construction method

Abstract

The present invention discloses a deformation adjustment support structure for a foundation pit diaphragm wall and its construction method. A backing block, a slider, a jack and a loading block are arranged in the collar slot hole. An arc-shaped groove one and a plurality of fixing holes one arranged radially are provided on the backing block; the slider includes an arc surface and a plane, and a plurality of fixing holes two are arranged at intervals along the radial direction of the arc surface of the slider; the slider can rotate along the circumferential direction of the groove of the backing block and is fixed by a fixing pin. By inserting the fixing pin into different fixing holes one and fixing holes two, the position of the slider in the groove one can be adjusted, so that the normal line of the plane of the slider is consistent with the axial direction of the end of the horizontal support, so that the acting force of the jack is consistent with the axial direction of the end of the horizontal support, realizing multi-angle adjustment of the jack loading direction, making the jack loading direction meet the construction requirements, and keeping the horizontal support in a stable stress system.

Description

Technical Field

[0001] The present invention relates to a deformation adjustment support structure for a diaphragm wall in a foundation pit and a construction method thereof, belonging to the technical field of foundation pit construction. Background Art

[0002] During the construction of ultra-deep foundation pits, the deformation of the diaphragm wall (especially in the project of integrating the two walls) is the key point of control. As Figure 1 shown, in order to control the deformation of the diaphragm wall, the conventional method is to set grooves on the waling beam, set a hydraulic servo system in the grooves, jack up the waling beam and the diaphragm wall through the hydraulic servo system, a horizontal support is arranged on the other side of the waling beam, the main strut and the side truss of the horizontal support are jacked up on the waling beam, columns are arranged below the horizontal support, and the hydraulic servo system applies loads to the diaphragm wall and the support, so as to control the deformation of the diaphragm wall. The hydraulic servo system usually includes hydraulic jacks, and the hydraulic jacks are arranged perpendicular to the waling beam. Figure 1 The axes of the side trusses on both sides in Figure 2 are not consistent with the direction of the acting force of the hydraulic jacks. Especially as shown, when the horizontal support is inclined to the waling beam, the directions of the acting forces of the side truss, the main strut of the horizontal support and the hydraulic jacks are all different, and a large bending moment will be generated in the slender support structure, which is not conducive to the stability of the system. Summary of the Invention

[0003] Aiming at the above problems existing in the deformation control of the diaphragm wall in the prior art, the present application provides a deformation adjustment support structure for a diaphragm wall in a foundation pit and a construction method thereof, which can quickly adjust the direction of the acting force of the jack to be consistent with the axis direction of the main strut or the side truss of the horizontal support.

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

[0005] A deformation adjustment support structure for a diaphragm wall in a foundation pit, wherein a plurality of slot holes are arranged on one side of the waling beam close to the diaphragm wall, and the slot holes are matched with the position of the horizontal support;

[0006] A backing block, a sliding block, a jack and a loading block are arranged in the slot holes;

[0007] The backing block is fixedly connected with the diaphragm wall; an arc-shaped groove one is arranged on the backing block, and a plurality of fixing holes one are arranged at intervals along the radial direction of the arc-shaped groove;

[0008] The slider includes an arc surface and a flat surface. The radius of the arc surface matches half of the radius of the groove of the backing block. A number of second fixing holes are arranged at intervals along the radial direction of the arc surface. The second fixing holes match the first fixing holes. The slider can rotate along the circumferential direction of the groove of the backing block and is fixed by fixing pins inserted into the first and second fixing holes.

[0009] The loading block is fixedly connected to the end of the horizontal support. An arc-shaped second groove is provided on the loading block. The second groove is concentric with the first groove.

[0010] The cylinder end of the jack is fixed to the flat surface side of the slider, and the telescopic end abuts against the arc surface of the second groove. The jack passes through the center of the arc surface of the slider.

[0011] Further, the included angle between two adjacent first fixing holes is α, and 5° ≤ α ≤ 15°.

[0012] Further, the radius R1 of the first groove is 240 mm, and the radius R2 of the second groove is 480 mm.

[0013] Further, an arc-shaped supporting surface is provided at the end of the jack. The radius of the arc-shaped supporting surface matches the second groove.

[0014] Further, the cross-section of the slot hole is trapezoidal. The side close to the diaphragm wall is the lower base of the trapezoid, and the side close to the foundation pit horizontal support is the upper base of the trapezoid. The lower base of the trapezoid is larger than the upper base of the trapezoid, and the included angles between the upper base of the trapezoid and the two waists are both obtuse angles.

[0015] Correspondingly, the present application also provides a construction method for the deformation adjustment support structure of the foundation pit diaphragm wall, including the following steps:

[0016] Step 1: According to the axis direction of the end of the foundation pit horizontal support, adjust the positions of the slider and the backing block, fix the cylinder end of the jack to the slider, and insert the fixing pins into the first and second fixing holes to fix the slider and the backing block.

[0017] Step 2: Place the backing block, slider, jack and loading block into the slot hole on the waling beam, make the backing block abut against the diaphragm wall, the telescopic end of the jack abut against the second groove of the loading block, the loading block abut against the end of the horizontal support, and the loading direction of the jack is consistent with the axis direction of the end of the foundation pit horizontal support.

[0018] Step 3: Control the telescopic amount of the jack to make the deformation amount of the diaphragm wall meet the requirements.

[0019] Due to the adoption of the above technical solutions, the present invention has the following advantages and positive effects compared with the prior art: By inserting the fixing pins of the deformation adjustment support structure of the foundation pit diaphragm wall into different fixing holes 1 and 2, the position of the slider in the first groove can be adjusted, so that the normal direction of the plane of the slider is consistent with the axial direction of the end of the horizontal support, thereby making the acting force of the jack consistent with the axial direction of the end of the horizontal support, realizing multi-angle adjustment of the loading direction of the jack, making the loading direction of the jack meet the construction requirements, and keeping the horizontal support in a stable stress system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 FIG. 6 is a schematic diagram of a deformation adjustment structure of a foundation pit diaphragm wall in the prior art;

[0021] Figure 2 FIG. 7 is another schematic diagram of a deformation adjustment structure of a foundation pit diaphragm wall in the prior art;

[0022] Figure 3 FIG. 8 is a schematic diagram of the deformation adjustment support structure of the foundation pit diaphragm wall in the present invention;

[0023] Figure 4 FIG. 9 is a diagram showing the positional relationship among the backing block, the slider, the jack and the loading block in the present invention;

[0024] Figure 5 FIG. 10 is a diagram showing the positional relationship between the backing block and the slider in the present invention;

[0025] Figure 6 FIG. 11 is a schematic diagram of the structure of the slider in the present invention.

[0026] The reference numerals in the figures are as follows:

[0027] 1 - Diaphragm wall; 2 - Waling; 3 - Groove hole; 4 - Horizontal support; 5 - Main support; 6 - Side truss; 7 - Column; 8 - Hydraulic servo system;

[0028] 10 - Backing block; 11 - First groove; 12 - First fixing hole;

[0029] 20 - Slider; 21 - Arc surface; 22 - Plane; 23 - Second fixing hole; 24 - Fixing pin;

[0030] 30 - Jack; 31 - Arc-shaped support surface;

[0031] 40 - Loading block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following further elaborates in detail on a deformation adjustment support structure for a foundation pit diaphragm wall and its construction method provided by the present invention in combination with the accompanying drawings and specific embodiments. In combination with the following description, the advantages and features of the present invention will be clearer. It should be noted that the attached drawings are all in a very simplified form and use non-precise scales, only for conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0033] Embodiment 1

[0034] As Figure 3 and Figure 4 shown, this embodiment provides a deformation adjustment support structure for a foundation pit diaphragm wall. A number of slot holes 3 are provided on one side of the waling beam 2 close to the diaphragm wall 1. The positions of the slot holes 3 match those of the horizontal support 4. A backing block 10, a slider 20, a jack 30, and a loading block 40 are arranged in the slot holes 3.

[0035] Combined with Figures 3 to 6 shown, the backing block 10 is fixedly connected to the diaphragm wall 1; an arc-shaped groove 11 is provided on the backing block 10, and a number of fixing holes 12 are arranged at intervals along the radial direction of the arc-shaped groove 11. The slider 20 includes an arc surface 21 and a flat surface 22. The radius of the arc surface 21 matches the radius of the groove 11 of the backing block 10; a number of fixing holes 23 are arranged at intervals along the radial direction of the arc surface 21 of the slider 20. The fixing holes 23 match the fixing holes 12; the slider 20 can rotate along the circumferential direction of the groove 11 of the backing block 10 and is fixed by fixing pins 24 inserted into the fixing holes 12 and 23. The loading block 40 is fixedly connected to the end of the foundation pit horizontal support. An arc-shaped groove 2 is provided on the loading block 40. In the initial stage, the groove 2 is concentric with the groove 11. To ensure concentricity, a cushion block can be arranged between the loading block and the end of the horizontal support. During the loading process of the jack, the telescopic amount usually changes little. Therefore, the groove 2 and the groove 11 are approximately concentric during the loading process. The cylinder end of the jack 30 is fixedly connected to one side of the flat surface 22 of the slider 20, and the telescopic end abuts against the arc surface of the groove 2. The jack 30 passes through the center of the arc surface.

[0036] For the deformation adjustment support structure of the foundation pit diaphragm wall provided in this embodiment, by selecting the fixing holes 12 and 23 into which the fixing pins 24 are inserted, the position of the slider 20 in the groove 11 can be adjusted, so that the normal direction of the flat surface 22 of the slider 20 is consistent with the axis direction of the end of the horizontal support 4, thereby making the acting force of the jack 30 consistent with the axis direction of the end of the horizontal support 4. Therefore, the deformation adjustment support structure of the foundation pit diaphragm wall in this embodiment can realize multi-angle adjustment of the loading direction of the jack 30, so that the horizontal support 4 maintains a stable stress system.

[0037] In a specific embodiment, the included angle between two adjacent fixing holes 12 is α, where 5° ≤ α ≤ 15°. Preferred embodiments are α = 10°, 12.5° or 15°, which facilitates adjusting the loading direction of the jack 30.

[0038] In a specific embodiment, the radius R1 of the first groove 11 is 240 mm, and the radius R2 of the second groove is 480 mm. When placing the loading block 40 and the backing block 10, ensure that the second groove of the loading block 40 is concentric with the first groove 11 of the backing block 10.

[0039] In a specific embodiment, an arc-shaped support surface 31 is provided at the end of the jack 30, and the radius of the arc-shaped support surface 31 matches that of the second groove. The provision of the arc-shaped support surface enables smooth transmission of the force between the end of the jack 30 and the loading block 40. As a preferred embodiment, a rubber gasket may also be provided on the arc-shaped support surface.

[0040] In a specific embodiment, the cross-section of the slot hole 3 is trapezoidal. The side close to the diaphragm wall 1 is the lower base of the trapezoid, and the side close to the foundation pit horizontal support 4 is the upper base of the trapezoid. The lower base of the trapezoid is greater than the upper base of the trapezoid, and the included angles between the upper base and the two waists are both obtuse angles, thereby avoiding stress concentration at the corners caused by the opening of the slot hole 3 on the collar beam 2.

[0041] Embodiment 2

[0042] This embodiment provides a construction method for a deformation adjustment support structure of a foundation pit diaphragm wall. The following further describes the construction method in combination with Embodiment 1 and Figures 3 to 6 The construction method includes the following steps:

[0043] Step 1: According to the direction of the end of the foundation pit horizontal support 4, adjust the positions of the slider 20 and the backing block 10, fix the cylinder end of the jack 30 to the slider 20, and insert the fixing pin 24 into the first fixing hole 12 and the second fixing hole 23 to fix the slider 20 and the backing block 10;

[0044] Step 2: Place the backing block 10, the slider 20, the jack 30 and the loading block 40 into the slot hole 3 on the collar beam 2, make the backing block 10 abut against the diaphragm wall 1, the telescopic end of the jack 30 abut against the second groove of the loading block 40, the loading block 40 abut against the end of the horizontal support 4, and the loading direction of the jack is consistent with the axial direction of the end of the foundation pit horizontal support;

[0045] Step 3: Control the telescopic amount of the jack 30 to make the deformation amount of the diaphragm wall 1 meet the requirements.

[0046] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the various technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0047] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A deformation adjustment support structure for a diaphragm wall of a foundation pit, wherein a plurality of slot holes are provided on one side of the collar close to the diaphragm wall, and the positions of the slot holes match those of the horizontal supports; characterized in that, a backing block, a slider, a jack and a loading block are arranged in the slot holes; the backing block is fixedly connected to the diaphragm wall; an arc-shaped groove one is provided on the backing block, and a plurality of fixing holes one are arranged at intervals along the radial direction of the arc-shaped groove; the slider includes an arc surface and a plane, and the radius of the arc surface matches the radius of the groove one of the backing block; a plurality of fixing holes two are arranged at intervals along the radial direction of the arc surface of the slider, and the fixing holes two match the fixing holes one; the slider can rotate along the circumferential direction of the groove of the backing block and is fixed by fixing pins inserted into the fixing holes one and fixing holes two; the loading block is fixedly connected to the end of the horizontal support, and an arc-shaped groove two is provided on the loading block, and the groove two is concentric with the groove one; the cylinder end of the jack is fixed to the plane side of the slider, and the telescopic end abuts against the arc surface of the groove two, and the jack passes through the center of the arc surface of the slider.

2. The deformation adjustment support structure for a diaphragm wall of a foundation pit according to claim 1, characterized in that, the included angle between two adjacent fixing holes one is α, and 5° ≤ α ≤ 15°.

3. The deformation adjustment support structure for a diaphragm wall of a foundation pit according to claim 1, characterized in that, the radius R1 of the groove one is 240 mm, and the radius R2 of the groove two is 480 mm.

4. The deformation adjustment support structure for a diaphragm wall of a foundation pit according to claim 1, characterized in that, an arc-shaped support surface is provided at the end of the jack, and the radius of the arc-shaped support surface matches the groove two.

5. The deformation adjustment support structure for a diaphragm wall of a foundation pit according to claim 1, characterized in that, the cross section of the slot hole is trapezoidal, the side close to the diaphragm wall is the lower bottom of the trapezoid, the side close to the horizontal support of the foundation pit is the upper bottom of the trapezoid, the lower bottom of the trapezoid is larger than the upper bottom of the trapezoid, and the included angles between the upper bottom of the trapezoid and the two waists are both obtuse angles.

6. A construction method of a deformation adjustment support structure for a foundation pit diaphragm wall according to any one of claims 1 to 5, characterized in that, It includes the following steps: Step 1: According to the axial direction of the end of the horizontal support of the foundation pit, adjust the positions of the slider and the backing block, fix the cylinder end of the jack to the slider, and insert the fixing pins into the fixing holes one and fixing holes two to fix the slider and the backing block; Step 2: Place the backing block, the slider, the jack and the loading block in the slot holes on the collar, make the backing block abut against the diaphragm wall, the telescopic end of the jack abut against the groove two of the loading block, the loading block abut against the end of the horizontal support, and the loading direction of the jack is consistent with the axial direction of the end of the horizontal support of the foundation pit; Step 3: Control the telescopic amount of the jack to make the deformation amount of the diaphragm wall meet the requirements.

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