External expansion type bearing plate for static load test of composite foundation

Abstract

The utility model provides an external expansion type bearing plate for a static load test of a composite foundation, which belongs to the technical field of foundation treatment and detection and comprises a central main plate, an auxiliary plate, a force transmission frame and a jack base plate, the central main plate is a solid plate; the auxiliary plate is a hollow plate; the auxiliary plates are sequentially arranged around the center main plate from inside to outside. The force transmission frame comprises a force transmission column; the first ends of the force transmission columns are connected to form the center of the force transmission frame. Included angles between two adjacent force transmission columns are equal; the force transmission frame is mounted above the central main plate and the auxiliary plate; the jack base plate is mounted above the force transmission frame; the center of the center main plate, the center of the force transmission frame and the center of the jack base plate are coaxially arranged. The external expansion type bearing plate for the static load test of the composite foundation is an assembly, is small in size and convenient to transport, does not need to be manufactured on site, avoids material waste caused by field cutting, and greatly reduces engineering cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of foundation treatment detection, and specifically discloses an outward-expanding bearing plate for static load test of composite foundation. Background Technique

[0002] In the field of engineering construction, the composite foundation treatment method is a common foundation treatment method, and the detection and evaluation of bearing capacity is the most important part of its engineering quality control. The static load test of composite foundation is a test method for detecting the bearing capacity of composite foundation.

[0003] The bearing plates selected for different static load tests of composite foundation are inconsistent, and need to be confirmed by pile spacing and pile layout form. The larger the pile spacing of the composite foundation, the larger the area of the bearing plate required.

[0004] At present, there are the following problems in the selection of bearing plates during the static load test of composite foundation: ① Since the pile spacing of the composite foundation piles is large, the required area of the bearing plate is large, and the bearing plate is required to have a certain stiffness. Therefore, it is often necessary to fabricate the bearing plate on site. At present, it is mostly welded with iron plates. After welding on site, the bearing plate has a large size, resulting in difficult transportation. It can only be welded on site or cut on site and taken away, causing a large economic loss. ② For different pile forming forms, such as plum blossom shape, square shape and other pile layout forms, the corresponding shaped bearing plates are often used for testing, and the effect is better. Therefore, the welded bearing plates often fail to meet the requirements. Content of the Utility Model

[0005] This application provides an outward-expanding bearing plate for static load test of composite foundation to improve the technical problems described in the background technique.

[0006] The outward-expanding bearing plate for static load test of composite foundation provided by the utility model includes a central main board, auxiliary boards, a force transfer frame and a jack cushion plate; the central main board is a solid board; the auxiliary boards are hollow boards; multiple auxiliary boards are arranged around the central main board in sequence from inside to outside; the inner end face of the innermost auxiliary board is connected to the outer end face of the central main board; among two adjacent auxiliary boards, the outer end face of the inner auxiliary board is connected to the inner end face of the outer auxiliary board; the force transfer frame includes force transfer columns; the first ends of multiple force transfer columns are connected to form the center of the force transfer frame; the included angle between two adjacent force transfer columns is equal; the force transfer frame is installed above the central main board and the auxiliary boards; the jack cushion plate is installed above the force transfer frame; the centers of the central main board, the force transfer frame and the jack cushion plate are coaxially arranged.

[0007] In the above-mentioned outward-expanding bearing plate for static load test of composite foundation, each auxiliary board is evenly divided into multiple auxiliary sub-boards, and two adjacent auxiliary sub-boards are connected by a connecting piece.

[0008] In the above-mentioned outward-expanded bearing plate for the static load test of the composite foundation, through holes are provided at both ends of the auxiliary sub-plates; the connecting member includes a connecting plate and an auxiliary plate connecting bolt; through holes are provided on the connecting plate; the ends of two adjacent auxiliary sub-plates are aligned, the connecting plate is placed at the ends of two adjacent auxiliary sub-plates, the through holes on the connecting plate are aligned with the through holes on the auxiliary sub-plates, and the auxiliary plate connecting bolts are tightened after passing through the through holes.

[0009] In the above-mentioned outward-expanded bearing plate for the static load test of the composite foundation, the distance from the center of the central main plate to the outer end face gradually decreases from top to bottom; the outermost auxiliary plate is the auxiliary plate I, and the auxiliary plates located between the central main plate and the auxiliary plate I are the auxiliary plate II; the distance from the center of the auxiliary plate I to the inner end face gradually decreases from top to bottom, and the distance from the center to the outer end face remains unchanged from top to bottom; the distance from the center of the auxiliary plate II to the inner end face gradually decreases from top to bottom, and the distance from the center to the outer end face gradually decreases from top to bottom.

[0010] In the above-mentioned outward-expanded bearing plate for the static load test of the composite foundation, the load transfer column is a semi-cylinder, the lower surface is a plane, and the upper surface is an arc surface; an arc groove for pressing the upper surface of the load transfer column is provided on the lower surface of the jack cushion plate.

[0011] In the above-mentioned outward-expanded bearing plate for the static load test of the composite foundation, a flat connecting end is provided at the first end of the load transfer column; through holes are provided on the connecting end; the connecting ends of multiple load transfer columns are stacked in sequence from bottom to top, and the sum of the thicknesses is the thickness of the load transfer column. The positions of the connecting ends on the corresponding load transfer columns increase in sequence from bottom to top. The lower surface of the connecting end at the bottom is flush with the lower surface of the corresponding load transfer column, and the upper surface of the connecting end at the top is flush with the upper surface of the corresponding load transfer column; the load transfer frame further includes a load transfer column connecting bolt, and the load transfer column connecting bolt is tightened after passing through the through holes on the connecting end in sequence.

[0012] The above-mentioned outward-expanded bearing plate for the static load test of the composite foundation is a circular outward-expanded bearing plate. The central main plate is a circular main plate, and the outer end face is a plane; the auxiliary plate I is a circular ring auxiliary plate I, and the inner end face is a plane; the auxiliary plate II is a circular ring auxiliary plate II, and both the inner end face and the outer end face are planes; each auxiliary plate is evenly divided into three auxiliary sub-plates; the load transfer frame includes six load transfer columns, and the load transfer columns and the connecting members are arranged in a staggered manner; the jack cushion plate is a circular cushion plate, and six arc grooves are provided on the lower surface.

[0013] The above-mentioned outward-expanded bearing plate for the static load test of the composite foundation is a square outward-expanded bearing plate. The central main plate is a square main plate, and the outer end face is a convex arc surface; the auxiliary plate I is a square ring auxiliary plate I, and the inner end face is a convex arc surface; the auxiliary plate II is a square ring auxiliary plate II, and both the inner end face and the outer end face are convex arc surfaces; each auxiliary plate is evenly divided into four auxiliary sub-plates along the diagonal; the load transfer frame includes four load transfer columns, and the load transfer columns are perpendicular to the right-angle sides of the central main plate and the auxiliary plates; the jack cushion plate is a square cushion plate, and four arc grooves are provided on the lower surface.

[0014] The installation method of the outward-expanded bearing plate for the static load test of the composite foundation described above includes the following steps:

[0015] S1. Install the central main board and auxiliary boards

[0016] Determine the test area, find the central position of the test area and place the central main board, and then place the auxiliary boards in sequence from the inside to the outside. The inner end face of the innermost auxiliary board is connected to the outer end face of the central main board. Among two adjacent auxiliary boards, the outer end face of the inner auxiliary board is connected to the inner end face of the outer auxiliary board;

[0017] S2. Install the load transfer frame

[0018] Place the load transfer frame on the central main board and auxiliary boards, and the center of the load transfer frame is coaxially arranged with the center of the central main board;

[0019] S3. Install the jack backing plate

[0020] Place the jack backing plate on the load transfer frame, and the center of the jack backing plate is coaxially arranged with the center of the load transfer frame.

[0021] Compared with the prior art, the present utility model has the following beneficial effects.

[0022] 1. The outward-expanded bearing plate for the static load test of the composite foundation is a combined component, with small size, convenient for transportation, no need for on-site fabrication, avoiding material waste caused by on-site cutting, and greatly reducing the project cost.

[0023] 2. Two structures of circular outward-expanded bearing plate and square outward-expanded bearing plate are provided for different pile-forming forms, with stronger pertinence. Using the bearing plate with the corresponding shape for the test can effectively improve the test effect.

[0024] 3. The central main board and auxiliary boards can be combined according to the test requirements on site to obtain different areas, with stronger adaptability.

[0025] 4. The structure of the present utility model is simple, reasonably designed, and has relatively high economic benefits. Description of the Drawings

[0026] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is the structural diagram of the circular outward-expanded bearing plate;

[0028] Figure 2 It is a cross-sectional view after the assembly of a circular main board, an annular auxiliary board I, and an annular auxiliary board II;

[0029] Figure 3 It is a structural diagram of the auxiliary sub-board in the annular auxiliary board I;

[0030] Figure 4 It is a structural diagram of the auxiliary sub-board in the annular auxiliary board II;

[0031] Figure 5 It is a structural diagram of the force transmission frame in the circular outward-expanded bearing plate;

[0032] Figure 6 It is for Figure 5 the exploded view of the force transmission frame in;

[0033] Figure 7 It is a structural diagram of the circular cushion plate;

[0034] Figure 8 It is a structural diagram of the square outward-expanded bearing plate;

[0035] Figure 9 It is a cross-sectional view after the assembly of a square main board, a square-ring auxiliary board I, and a square-ring auxiliary board II;

[0036] Figure 10 It is a structural diagram of the auxiliary sub-board in the square-ring auxiliary board I;

[0037] Figure 11 It is a structural diagram of the auxiliary sub-board in the square-ring auxiliary board II;

[0038] Figure 12 It is a structural diagram of the force transmission frame in the square outward-expanded bearing plate;

[0039] Figure 13 It is for Figure 12 the exploded view of the force transmission frame in;

[0040] Figure 14 It is a structural diagram of the square cushion plate.

[0041] In the figure: 1 - force transmission frame; 1.1 - force transmission column; 1.2 - connection end; 2 - connection plate;

[0042] 3 - auxiliary board connection bolt;

[0043] 4a - circular main board; 4b - square main board;

[0044] 5a - annular auxiliary board I; 5b - square-ring auxiliary board I;

[0045] 6a - annular auxiliary board II; 6b - square-ring auxiliary board II;

[0046] 7a - circular cushion plate; 7b - square cushion plate;

[0047] 100 - Composite foundation pile. Specific implementation mode

[0048] The technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0049] Embodiment 1

[0050] This embodiment provides an extended load-bearing plate for composite foundation static load test, including a central main board, auxiliary boards, a force transmission frame 1, and a jack cushion plate; the central main board is a solid board; the auxiliary boards are hollow boards; multiple auxiliary boards are arranged in sequence from inside to outside around the central main board; the inner end face of the innermost auxiliary board is connected to the outer end face of the central main board; among two adjacent auxiliary boards, the outer end face of the inner auxiliary board is connected to the inner end face of the outer auxiliary board; the force transmission frame 1 includes force transmission columns 1.1; the first ends of multiple force transmission columns 1.1 are connected to form the center of the force transmission frame 1; the included angle between two adjacent force transmission columns 1.1 is equal; the force transmission frame 1 is installed above the central main board and the auxiliary boards; the jack cushion plate is installed above the force transmission frame 1; the centers of the central main board, the force transmission frame 1, and the jack cushion plate are coaxially arranged.

[0051] The above extended load-bearing plate for composite foundation static load test is in a combined form as a whole, can be disassembled, is convenient for storage and transportation, and different numbers of auxiliary boards can be selected to be combined with the central main board according to the test requirements on site to obtain different areas.

[0052] In the above extended load-bearing plate for composite foundation static load test, each auxiliary board is evenly divided into multiple auxiliary sub-boards, and two adjacent auxiliary sub-boards are connected by a connecting piece. Disassembling the auxiliary board into smaller units is more convenient for storage and transportation.

[0053] In the above extended load-bearing plate for composite foundation static load test, through holes are opened at both ends of the auxiliary sub-board; the connecting piece includes a connecting plate 2 and an auxiliary board connecting bolt 3; through holes are opened on the connecting plate 2; the ends of two adjacent auxiliary sub-boards are aligned, the connecting plate 2 is placed at the ends of two adjacent auxiliary sub-boards, the through holes of the connecting plate 2 are aligned with the through holes of the auxiliary sub-board, and the auxiliary board connecting bolt 3 is tightened after passing through the through holes to realize the connection of two adjacent auxiliary sub-boards.

[0054] In the above-mentioned outward-expanded bearing plate for the static load test of the composite foundation, the distance from the center of the central main board to the outer end face gradually decreases from top to bottom; the outermost auxiliary board is auxiliary board I, and the auxiliary board located between the central main board and auxiliary board I is auxiliary board II; the distance from the center of auxiliary board I to the inner end face gradually decreases from top to bottom, and the distance from the center to the outer end face remains unchanged from top to bottom; the distance from the center of auxiliary board II to the inner end face gradually decreases from top to bottom, and the distance from the center to the outer end face gradually decreases from top to bottom.

[0055] In the above-mentioned outward-expanded bearing plate for the static load test of the composite foundation, the force transfer column 1.1 is a semi-cylinder, the lower surface is a plane, and the upper surface is an arc surface; an arc groove for pressing the upper surface of the force transfer column 1.1 is provided on the lower surface of the jack cushion plate. The cooperation between the force transfer column 1.1 and the arc groove facilitates the positioning of the jack cushion plate 2.

[0056] In the above-mentioned outward-expanded bearing plate for the static load test of the composite foundation, a flat connecting end 1.2 is provided at the first end of the force transfer column 1.1; through holes are provided on the connecting end 1.2; the connecting ends 1.2 of multiple force transfer columns 1.1 are stacked in sequence from bottom to top, and the sum of the thicknesses is the thickness of the force transfer column 1.1. The positions of the connecting ends 1.2 on the corresponding force transfer columns 1.1 increase in sequence from bottom to top. The lower surface of the connecting end 1.2 at the bottom is flush with the lower surface of the corresponding force transfer column 1.1, and the upper surface of the connecting end 1.2 at the top is flush with the upper surface of the corresponding force transfer column 1.1. That is, after the connecting ends 1.2 of all the force transfer columns 1.1 are stacked, they are consistent with the thickness of the force transfer column 1.1 itself, so that the surface of the force transfer frame 1 is flat; the force transfer frame 1 further includes force transfer column connecting bolts, and the force transfer column connecting bolts are tightened after passing through the through holes on the connecting end 1.2 in sequence.

[0057] Embodiment 2

[0058] For the triangular and plum blossom pile layout forms, the outward-expanded bearing plate for the static load test of the composite foundation provided in this embodiment is a circular outward-expanded bearing plate. The central main board is a circular main board 4a, and the outer end face is a plane; the auxiliary board I is an annular auxiliary board I 5a, and the inner end face is a plane; the auxiliary board II is an annular auxiliary board II 6a, and both the inner end face and the outer end face are planes; each auxiliary board is evenly divided into three auxiliary sub-boards; the force transfer frame 1 includes six force transfer columns 1.1, and the force transfer columns 1.1 are arranged in a staggered manner with the connecting members; the jack cushion plate is a circular cushion plate 7a, and six arc grooves are provided on the lower surface.

[0059] The material of the circular main board 4a is manganese steel, the thickness is 8 cm, the diameter of the upper surface is 1.13 m, and the diameter of the lower surface is 1.05 mm.

[0060] The material of the auxiliary plate is manganese steel, with a thickness of 8 cm, a width of 500 mm, and a through hole with a diameter of 80 mm is opened 200 mm away from the end. The vertical parallelism difference between the inner end faces of the circular ring auxiliary plate Ⅰ 5a is 80 mm, and the vertical parallelism differences between the inner and outer end faces of the circular ring auxiliary plate Ⅱ 6a are both 80 mm.

[0061] The outer end face of the circular main plate 4a, the inner end face of the circular ring auxiliary plate Ⅰ 5a, and the inner and outer end faces of the circular ring auxiliary plate Ⅱ 6a are obtained by grinding.

[0062] The material of the circular cushion plate 7a is manganese steel, with a thickness of 200 mm, a diameter of 0.8 m, and the diameter of the arc-shaped groove is 100 mm.

[0063] The material of the force transfer column 1.1 is manganese steel, with a diameter of 200 mm, a length of 3.5 m, and a through hole with a diameter of 100 mm is opened at the connection end 1.2.

[0064] The material of the connecting plate 2 is manganese steel, with dimensions of 400*800*50 mm, and through holes with a diameter of 80 mm are opened 200 mm away from the end faces on both sides.

[0065] Embodiment 3

[0066] For the square pile layout form, the composite foundation static load test outward-expanded bearing plate provided in this embodiment is a square outward-expanded bearing plate. The central main plate is a square main plate 4b, and the outer end face is a convex arc surface; the auxiliary plate Ⅰ is a square ring auxiliary plate Ⅰ 5b, and the inner end face is a convex arc surface; the auxiliary plate Ⅱ is a square ring auxiliary plate Ⅱ 6b, and both the inner and outer end faces are convex arc surfaces; each auxiliary plate is evenly divided into four auxiliary sub-plates along the diagonal; the force transfer frame 1 includes four force transfer columns 1.1, and the force transfer columns 1.1 are perpendicular to the right-angle sides of the central main plate and the auxiliary plate; the jack cushion plate is a square cushion plate 7b, and four arc-shaped grooves are opened on the lower surface.

[0067] The material of the square main plate 4b is manganese steel, with a thickness of 8 cm, the side length of the upper surface is 1 m, and the side length of the lower surface is 0.92 m.

[0068] The material of the auxiliary plate is manganese steel, with a thickness of 8 cm, a width of 500 mm, and a through hole with a diameter of 80 mm is opened 200 mm away from the end. The vertical parallelism difference between the inner end faces of the square ring auxiliary plate Ⅰ 5b is 80 mm, and the vertical parallelism differences between the inner and outer end faces of the square ring auxiliary plate Ⅱ 6b are both 80 mm.

[0069] The outer end face of the square main plate 4b, the inner end face of the square ring auxiliary plate Ⅰ 5b, and the inner and outer end faces of the square ring auxiliary plate Ⅱ 6b are obtained by grinding.

[0070] The material of the square cushion plate 7b is manganese steel, with a thickness of 200 mm, a side length of 0.8 m, and the diameter of the arc-shaped groove is 100 mm.

[0071] The material of the force transfer column 1.1 is manganese steel, with a diameter of 200 mm and a length of 3.5 m. A through hole with a diameter of 100 mm is opened at the connection end 1.2.

[0072] The material of the connecting plate 2 is manganese steel, with dimensions of 400*800*50 mm. Through holes with a diameter of 80 mm are opened 200 mm from both ends of the plate.

[0073] Example 4

[0074] The installation method of the above-mentioned expanded bearing plate for the composite foundation static load test includes the following steps:

[0075] S1, Install the central main board and auxiliary boards

[0076] Determine the test area, find the central position of the test area and place the central main board, and then place the auxiliary boards in sequence from the inside to the outside. The inner end face of the innermost auxiliary board is connected to the outer end face of the central main board. Among the adjacent two auxiliary boards, the outer end face of the inner auxiliary board is connected to the inner end face of the outer auxiliary board. Adjacent two auxiliary sub-boards in the same auxiliary board are connected by connecting pieces;

[0077] S2, Install the force transfer frame

[0078] Place the force transfer frame 1 on the central main board and auxiliary boards, and the center of the force transfer frame is coaxially arranged with the center of the central main board;

[0079] Specifically, place the connection ends 1.2 of multiple force transfer columns 1.1 above the center of the central main board, stack them in sequence from bottom to top, and fasten the force transfer column connection bolts after passing through the through holes on the connection ends 1.2 in sequence;

[0080] S3, Install the jack backing plate

[0081] Place the jack backing plate on the force transfer frame. The center of the jack backing plate is coaxially arranged with the center of the force transfer frame 1, and the arc grooves correspond to the force transfer columns 1.1 one by one.

[0082] S4, Place a jack on the jack backing plate.

[0083] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An outward expansion bearing plate for static load test of composite foundation, characterized in that: It includes a central main board, an auxiliary board, a force transmission frame and a jack pad; The central main board is a solid board; The auxiliary plate is a hollow plate; Multiple auxiliary boards are arranged in sequence from inside to outside around the central main board; The inner end surface of the innermost auxiliary plate is connected to the outer end surface of the central main plate; Of the two adjacent auxiliary plates, the outer end surface of the auxiliary plate located on the inner side is connected to the inner end surface of the auxiliary plate located on the outer side; The force transmission frame includes a force transmission column; The first ends of the plurality of force transmission columns are connected to form the center of the force transmission frame; The angles between two adjacent force transmission columns are equal; The force transmission frame is installed above the central main board and the auxiliary board; The jack plate is installed above the force transmission frame; The center of the central main board, the center of the force transmission frame, and the center of the jack pad are coaxially arranged.

2. The outward expansion bearing plate for composite foundation static load test according to claim 1 is characterized in that: Each auxiliary board is evenly divided into a plurality of auxiliary sub-boards, and two adjacent auxiliary sub-boards are connected by connecting pieces.

3. The outward expansion bearing plate for composite foundation static load test according to claim 2 is characterized in that: Through holes are provided at both ends of the auxiliary sub-board; The connecting parts include connecting plates and auxiliary plate connecting bolts; The connecting plate is provided with a through hole; The ends of two adjacent auxiliary sub-boards are aligned, the connecting plate is placed at the ends of the two adjacent auxiliary sub-boards, the through holes of the connecting plate are aligned with the through holes of the auxiliary sub-boards, and the auxiliary plate connecting bolts are fastened after passing through the through holes.

4. The outward expansion bearing plate for static load test of composite foundation according to any one of claims 1 to 3, characterized in that: The distance from the center of the center main board to the outer end surface gradually decreases from top to bottom; The auxiliary board located on the outermost side is auxiliary board I, and the auxiliary board located between the central main board and auxiliary board I is auxiliary board II; The distance from the center to the inner end surface of the auxiliary plate I gradually decreases from top to bottom, and the distance from the center to the outer end surface remains unchanged from top to bottom; The distance from the center of the auxiliary plate II to the inner end surface gradually decreases from top to bottom, and the distance from the center to the outer end surface gradually decreases from top to bottom.

5. The outward expansion bearing plate for composite foundation static load test according to claim 4 is characterized in that: The force transmission column is a semi-cylinder, the lower surface is a plane, and the upper surface is an arc surface; The lower surface of the jack pad is provided with an arc groove for pressing the upper surface of the force transmission column.

6. The outward expansion bearing plate for composite foundation static load test according to claim 5, characterized in that: The first end of the force transmission column is provided with a flat connection end; A through hole is provided on the connecting end; The connecting ends of multiple force transmission columns are stacked from bottom to top, and the sum of their thicknesses is the thickness of the force transmission column. The positions of the connecting ends on the corresponding force transmission columns increase from bottom to top, and the lower surface of the connecting end at the bottom is flush with the lower surface of the corresponding force transmission column, and the upper surface of the connecting end at the top is flush with the upper surface of the corresponding force transmission column; The force transmission frame also includes force transmission column connecting bolts, which are tightened after passing through the through holes on the connecting ends in sequence.

7. The outward expansion bearing plate for composite foundation static load test according to claim 6, characterized in that: It is a circular outward-expanded pressure plate; The center main board is a circular main board, and the outer end surface is a flat surface; The auxiliary plate I is a circular auxiliary plate I, and the inner end surface is a plane; The auxiliary plate II is a circular auxiliary plate II, and both the inner end surface and the outer end surface are flat surfaces; Each auxiliary board is evenly divided into three auxiliary sub-boards; The force transmission frame includes six force transmission columns, and the force transmission columns and the connecting pieces are staggered; The jack pad is a circular pad with six arc grooves on the lower surface.

8. The outward expansion bearing plate for composite foundation static load test according to claim 6, characterized in that: It is a square outward-expanded pressure plate; The central main board is a square main board, and the outer end surface is an arc surface convex outward; The auxiliary plate I is a square ring auxiliary plate I, and the inner end surface is an arc surface convex outwards; The auxiliary plate II is a square ring auxiliary plate II, and both the inner end surface and the outer end surface are arc surfaces convex outwards; Each auxiliary board is evenly divided into four auxiliary sub-boards along the diagonal line; The force transmission frame includes four force transmission columns, which are perpendicular to the right-angled sides of the central main plate and the auxiliary plate; The jack pad is a square pad with four arc grooves on the lower surface.

Images