A measuring device for the lateral frictional resistance of pile foundations

Abstract

The present invention discloses a measuring device for the lateral friction resistance of pile foundations, belonging to the technical field of pile foundation engineering, and comprising: an upper pressing plate, a lower pressing plate, a limiting rod, a steel reinforcement cage, a leveling assembly, a shielding assembly, a cable anchor meter and an adjusting assembly; a cable anchor meter is installed between the upper pressing plate and the lower pressing plate, and a steel reinforcement cage is installed on the upper pressing plate. The shielding assembly can effectively reduce the gap between the upper pressing plate and the inner wall of the pile hole, facilitating the pouring of concrete; the leveling assembly can make the lower pressing plate adapt to the shape of the inner bottom end of the pile hole, facilitating the lower pressing plate to be in a horizontal state. The adjusting assembly can keep the leveling assembly fixed and make the shielding assembly work, with convenient operation and capable of effectively improving the measurement effect.

Description

Technical Field

[0001] The present invention belongs to the technical field of pile foundation engineering, and particularly relates to a measuring device for the lateral friction resistance of a pile foundation. Background Technique

[0002] The pile foundation is a widely used foundation form. The pile contacts the soil on both the side wall and the end. Due to the variability of soil layer properties and the interaction between the pile and the soil, the complexity of its force is determined. The bearing capacity of a friction pile foundation is mainly composed of the end bearing capacity of the pile and the lateral friction resistance. Among them, the lateral friction resistance often accounts for a large proportion of the pile foundation bearing capacity. It is an important consideration index for the design and construction of pile foundations and the detection of pile foundation bearing capacity. It must be tested on-site. Its detection methods are widely used in various pile foundation bearing capacity detection services such as pile foundation loading tests, self-balanced tests, and anchor pile tests.

[0003] In the process of using the existing measuring device for the lateral friction resistance of a pile foundation, concrete easily leaks from the gap between the measuring device and the soil wall, affecting the measurement effect, and it is not convenient to keep the measuring device always horizontal during the measurement process, affecting the measurement accuracy.

[0004] To avoid the above technical problems, it is indeed necessary to provide a measuring device for the lateral friction resistance of a pile foundation to overcome the defects in the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide a measuring device for the lateral friction resistance of a pile foundation to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A measuring device for the lateral friction resistance of a pile foundation, comprising:

[0008] An upper pressing plate, a lower pressing plate is provided on the bottom side of the upper pressing plate, a limiting rod is installed on the bottom side edge of the upper pressing plate, the limiting rod penetrates through the lower pressing plate, the upper pressing plate is parallel to the lower pressing plate, and a steel reinforcement cage is installed at the top end of the upper pressing plate; a leveling assembly is installed on the bottom side of the lower pressing plate for adapting the lower pressing plate to the shape of the inner bottom end of the pile hole and making the lower pressing plate horizontal;

[0009] A shielding assembly is installed on the upper pressing plate for reducing the gap between the upper pressing plate and the inner wall of the pile hole. A plurality of anchor cable meters are evenly distributed between the lower pressing plate and the upper pressing plate. An adjusting assembly is installed on the lower pressing plate and the upper pressing plate for fixing the leveling assembly and making the shielding assembly extend out of the upper pressing plate.

[0010] As a further technical solution of the present invention: The leveling assembly includes:

[0011] A fixed frame is installed on the lower pressing plate. A positioning rod is installed inside the fixed frame. A positioning cylinder is arranged outside the positioning rod. The positioning cylinder penetrates through the lower pressing plate. A support seat is installed at the bottom end of the positioning cylinder. A first elastic member is installed between the positioning cylinder and the positioning rod for adjusting the position of the positioning cylinder on the positioning rod.

[0012] A fixing component is also installed on the lower pressing plate and the positioning cylinder for fixing the position of the positioning cylinder on the positioning rod.

[0013] As a further technical solution of the present invention: The fixing component includes:

[0014] A fixed block is fixedly installed on the lower pressing plate. A long rod is installed on the fixed block. The long rod penetrates through the fixed block. A moving cylinder is fixedly installed on a fixing plate on the side close to the fixed block. A plurality of positioning holes are evenly distributed on the fixing plate. A positioning tooth is fixedly installed at one end of the long rod close to the moving cylinder. The positioning tooth is in concave-convex connection with the positioning hole; A second elastic member is installed at the other end of the long rod. One end of the second elastic member is connected to the lower pressing plate, and the other end is connected to the long rod for adjusting the position of the long rod on the fixed block so that the positioning tooth is connected to the positioning hole.

[0015] As a further technical solution of the present invention: The shielding component includes:

[0016] A limiting groove is located on the upper pressing plate and is horizontal. A shielding plate is installed inside the limiting groove. The shape of the shielding plate is arc-shaped. Slot holes are arranged on both sides of the shielding plate. Folding plates are installed inside the slot holes; A sliding groove is arranged inside the limiting groove. A sliding strip is installed on the shielding plate. The sliding strip is in concave-convex connection with the sliding groove for limiting the movement track of the shielding plate.

[0017] As a further technical solution of the present invention: The adjusting component includes:

[0018] A moving rod penetrates through the upper pressing plate and extends into the inside of the fixed frame. The moving rod is vertical and located in the middle of the upper pressing plate. A disc is installed outside the moving rod. A first hinge seat is installed outside the disc. A second hinge seat is fixedly installed at the bottom side of one end of the shielding plate close to the moving rod. A connecting rod is installed between the first hinge seat and the second hinge seat. Both ends of the connecting rod are rotatably connected to the first hinge seat and the second hinge seat;

[0019] A connecting frame is installed at one end of the moving rod extending into the inside of the fixed frame. The cross-sectional shape of the connecting frame is inverted U-shaped. A short board is fixedly installed at one end of the long rod close to the connecting frame;

[0020] A positioning component is installed between the moving rod and the upper pressing plate for limiting the position of the moving rod on the upper pressing plate.

[0021] As a further technical solution of the present invention: The positioning assembly includes:

[0022] Positioning grooves, which are located on the upper pressing plate and on both sides of the moving rod. Short rods are installed inside the positioning grooves. A third elastic member is installed between the short rods and the positioning grooves. One end of the short rod extending out of the positioning groove is fixedly installed with a first rack. A placement groove is provided on the outer side of the moving rod, and a second rack is installed inside the placement groove.

[0023] As a further technical solution of the present invention: A steel wire rope is installed at the top of the moving rod, and a reinforcement meter is installed on the steel reinforcement cage. There are multiple reinforcement meters and they are evenly distributed on the steel reinforcement cage.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] A measuring device for the lateral friction resistance of a pile foundation provided by the present invention. An anchor cable meter is installed between the upper pressing plate and the lower pressing plate, and a steel reinforcement cage is installed on the upper pressing plate. Through the shielding assembly, the gap between the upper pressing plate and the inner wall of the pile hole can be effectively reduced, facilitating the pouring of concrete; through the leveling assembly, the lower pressing plate can be adapted to the shape of the inner bottom end of the pile hole, facilitating the lower pressing plate to be in a horizontal state. Through the adjustment assembly, the leveling assembly can be kept fixed and the shielding assembly can be made to work, with convenient operation and capable of effectively improving the measurement effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a structural schematic diagram between the shielding plate and the folding plate in the present invention.

[0028] Figure 3 It is a structural schematic diagram of the disc and the first hinge seat in the present invention.

[0029] Figure 4 For the present invention Figure 1 The enlarged structural schematic diagram at A in it.

[0030] Figure 5 It is a structural schematic diagram of the leveling assembly in the present invention.

[0031] Figure 6 It is a structural schematic diagram between the shielding plate and the sliding bar in the present invention.

[0032] In the attached drawings: 1 - upper pressing plate, 2 - limiting rod, 3 - lower pressing plate, 4 - steel reinforcement cage, 5 - leveling assembly, 51 - fixing frame, 52 - positioning rod, 53 - positioning cylinder, 54 - support seat, 55 - first elastic member, 56 - fixing assembly, 561 - fixing block, 562 - long rod, 563 - fixing plate, 564 - positioning hole, 565 - positioning tooth, 566 - second elastic member, 6 - shielding assembly, 61 - limiting groove, 62 - shielding plate, 63 - slot hole, 64 - folding plate, 65 - sliding groove, 66 - sliding bar, 7 - anchor cable meter, 8 - adjusting assembly, 81 - moving rod, 82 - disc, 83 - first hinge seat, 84 - second hinge seat, 85 - connecting rod, 86 - connecting frame, 87 - short plate, 88 - positioning assembly, 881 - positioning groove, 882 - short rod, 883 - third elastic member, 884 - first rack, 885 - placing groove, 886 - second rack, 9 - steel wire rope, 10 - steel bar meter. Detailed implementation manners

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0035] As Figures 1 to 6 shown, in the embodiment provided by the present invention, a measuring device for the lateral friction resistance of a pile foundation includes:

[0036] An upper pressing plate 1, a lower pressing plate 3 is provided on the bottom side of the upper pressing plate 1, a limiting rod 2 is installed on the bottom side edge of the upper pressing plate 1, the limiting rod 2 penetrates through the lower pressing plate 3, the upper pressing plate 1 is parallel to the lower pressing plate 3, and a steel reinforcement cage 4 is installed on the top end of the upper pressing plate 1; a leveling assembly 5 is installed on the bottom side of the lower pressing plate 3 for adapting the lower pressing plate 3 to the shape of the inner bottom end of the pile hole to make the lower pressing plate 3 horizontal.

[0037] A shielding assembly 6 is installed on the upper pressing plate 1 for reducing the gap between the upper pressing plate 1 and the inner wall of the pile hole. A plurality of anchor cable meters 7 are evenly distributed between the upper pressing plate 1 and the lower pressing plate 3. An adjusting assembly 8 is installed on the lower pressing plate 3 and the upper pressing plate 1 for fixing the leveling assembly 5 and making the shielding assembly 6 extend out of the upper pressing plate 1.

[0038] In this embodiment, an anchor cable meter 7 is installed between the upper pressing plate 1 and the lower pressing plate 3. A steel reinforcement cage 4 is installed on the upper pressing plate 1. The shielding component 6 can effectively reduce the gap between the upper pressing plate 1 and the inner wall of the pile hole, facilitating the pouring of concrete. The leveling component 5 can make the lower pressing plate 3 adapt to the shape of the inner bottom end of the pile hole, facilitating the lower pressing plate 3 to be in a horizontal state. The adjusting component 8 can fix the leveling component 5 and make the shielding component 6 work, with convenient operation and effectively improving the measurement effect. The anchor cable meters 7 are distributed in a ring between the upper pressing plate 1 and the lower pressing plate 3, facilitating the measurement operation. Both the upper pressing plate 1 and the lower pressing plate 3 are circular.

[0039] In an embodiment of the present invention, please refer to Figure 1 and Figure 5 , the leveling component 5 includes:

[0040] A fixed frame 51 is installed on the lower pressing plate 3. A positioning rod 52 is installed inside the fixed frame 51. A positioning cylinder 53 is arranged outside the positioning rod 52. The positioning cylinder 53 penetrates through the lower pressing plate 3. A support seat 54 is installed at the bottom end of the positioning cylinder 53. A first elastic member 55 is installed between the positioning cylinder 53 and the positioning rod 52 for adjusting the position of the positioning cylinder 53 on the positioning rod 52.

[0041] A fixing component 56 is further installed on the lower pressing plate 3 and the positioning cylinder 53 for fixing the position of the positioning cylinder 53 on the positioning rod 52.

[0042] The fixing component 56 includes:

[0043] A fixing block 561 is fixedly installed on the lower pressing plate 3. A long rod 562 is installed on the fixing block 561. The long rod 562 penetrates through the fixing block 561. A moving cylinder is close to one side of the fixing block 561 and is fixedly installed on a fixing plate 563. A plurality of positioning holes 564 are evenly distributed on the fixing plate 563. A positioning tooth 565 is fixedly installed at one end of the long rod 562 close to the moving cylinder. The positioning tooth 565 is connected with the positioning holes 564 in a concave-convex manner. A second elastic member 566 is installed at the other end of the long rod 562. One end of the second elastic member 566 is connected to the lower pressing plate 3, and the other end is connected to the long rod 562 for adjusting the position of the long rod 562 on the fixing block 561 to connect the positioning tooth 565 with the positioning holes 564.

[0044] In this embodiment, the fixed frame 51 is fixedly installed on the upper side of the lower pressing plate 3. A vertical positioning rod 52 is installed inside the fixed frame 51. The positioning rod 52 is in concave-convex connection with the positioning cylinder 53. The positioning cylinder 53 can move vertically along the positioning rod 52. The first elastic member 55 can be a spring, rubber, etc. In this embodiment, the first elastic member 55 is a spring. The support seat 54 at the bottom end of the positioning cylinder 53 facilitates contact with the inner bottom end of the pile hole.

[0045] The long rod 562 is horizontal and penetrates through the fixed block 561. A second elastic member 566 is installed between one end of the long rod 562 and the lower pressing plate 3. The second elastic member 566 can be a spring, rubber, etc. In this embodiment, the second elastic member 566 is a spring. A plurality of uniformly distributed positioning holes 564 are provided on the fixing plate 563. The positioning tooth 565 is fixedly installed at one end of the long rod 562. Through the second elastic member 566, it is convenient to connect the positioning tooth 565 with the positioning hole 564, which facilitates fixing the position of the positioning cylinder 53 and facilitating the support between the positioning cylinder 53 and the lower pressing plate 3. The adjusting assembly 8 is connected to the long rod 562 to facilitate the limitation of the position of the long rod 562.

[0046] In an embodiment of the present invention, please refer to Figure 1 , Figure 2 and Figure 6 , the shielding assembly 6 includes:

[0047] The limiting groove 61 is located on the upper pressing plate 1 and is horizontal. A shielding plate 62 is installed inside the limiting groove 61. The shape of the shielding plate 62 is arc-shaped. Slot holes 63 are provided on both sides of the shielding plate 62. A folding plate 64 is installed inside the slot holes 63. A sliding groove 65 is provided inside the limiting groove 61. A sliding bar 66 is installed on the shielding plate 62. The sliding bar 66 is in concave-convex connection with the sliding groove 65 to limit the movement track of the shielding plate 62.

[0048] In this embodiment, the limiting groove 61 is located on the upper pressing plate 1. The shielding plate 62 is located inside the limiting groove 61. The shielding plate 62 can move inside the limiting groove 61. Slot holes 63 are provided on both sides of the shielding plate 62. The shape of the shielding plate 62 is arc-shaped and there are multiple ones. Multiple shielding plates 62 can be assembled together to form a circle. A folding plate 64 is installed inside the slot holes 63 between two shielding plates 62. When the shielding plate 62 extends out of the limiting groove 61, the gap between two shielding plates 62 becomes larger. The folding plate 64 can shield the gap, which is convenient for use.

[0049] In an embodiment of the present invention, please refer to Figure 1 , Figure 3 and Figure 4 , the adjusting assembly 8 includes:

[0050] The moving rod 81 penetrates through the upper pressing plate 1 and extends into the inner side of the fixed frame 51. The moving rod 81 is vertical and located in the middle of the upper pressing plate 1. A disc 82 is installed on the outer side of the moving rod 81, and a first hinge seat 83 is installed on the outer side of the disc 82. A second hinge seat 84 is fixed to the bottom side of the end of the shielding plate 62 close to the moving rod 81. A connecting rod 85 is installed between the first hinge seat 83 and the second hinge seat 84, and both ends of the connecting rod 85 are rotatably connected to the first hinge seat 83 and the second hinge seat 84;

[0051] A connecting frame 86 is installed at one end of the moving rod 81 extending into the inner side of the fixed frame 51. The cross-sectional shape of the connecting frame 86 is an inverted U shape, and a short plate 87 is fixedly installed at one end of the long rod 562 close to the connecting frame 86;

[0052] A positioning component 88 is installed between the moving rod 81 and the upper pressing plate 1 for limiting the position of the moving rod 81 on the upper pressing plate 1.

[0053] The positioning component 88 includes:

[0054] Positioning grooves 881 are located on the upper pressing plate 1 and on both sides of the moving rod 81. A short rod 882 is installed inside the positioning grooves 881. A third elastic member 883 is installed between the short rod 882 and the positioning grooves 881. A first rack 884 is fixedly installed at one end of the short rod 882 extending out of the positioning grooves 881. A placing groove 885 is provided on the outer side of the moving rod 81, and a second rack 886 is installed inside the placing groove 885.

[0055] In this embodiment, the moving rod 81 is vertical and penetrates through the upper pressing plate 1. A disc 82 is installed on the outer side of the moving rod 81. The disc 82 is located between the upper pressing plate 1 and the lower pressing plate 3. A plurality of first hinge seats 83 are evenly distributed on the outer side of the disc 82. A second hinge seat 84 is installed on the bottom side of the shielding plate 62. Rolling bearings are installed between both ends of the connecting rod 85 and the first hinge seat 83 and the second hinge seat 84 respectively. When the moving rod 81 drives the disc 82 to move vertically, it is convenient to adjust the position of the shielding plate 62 inside the limiting groove 61. One end of the long rod 562 is installed with a short plate 87, and a connecting frame 86 is fixedly installed at the bottom end of the moving rod 81. When the connecting frame 86 contacts the short rod 882, the position of the long rod 562 can be limited. At this time, the positioning tooth 565 is separated from the positioning hole 564, which is convenient for the positioning cylinder 53 to adjust its position along the positioning rod 52;

[0056] Inside the positioning groove 881, a short rod 882 and a third elastic member 883 are installed. The tooth shapes of the teeth on the first rack 884 and the second rack 886 are the same, both being right-angled triangles. When the moving rod 81 moves upward, and when the moving rod 81 moves downward, at this time, the first rack 884 and the second rack 886 are engaged, which can effectively prevent the moving rod 81 from moving downward, facilitating the limitation of the position of the shielding plate 62 and preventing the shielding plate 62 from retracting. A steel wire rope 9 is installed at the top of the moving rod 81, and a reinforcement meter 10 is installed on the steel reinforcement cage 4. A plurality of reinforcement meters 10 are provided and evenly distributed on the steel reinforcement cage 4. By pulling the steel wire rope 9, the moving rod 81 can be moved upward, and the side friction resistance of the pile foundation can be calculated through the measured values of the reinforcement meter 10.

[0057] The working principle of the present invention is:

[0058] In the present invention, first, the steel reinforcement cage 4, the upper pressing plate 1, and the lower pressing plate 3 are placed into the pile hole. Then, under the self-weight of the lower pressing plate 3, the support seat 54 at the bottom end of the positioning cylinder 53 contacts the inner bottom end of the pile hole. By adjusting the lower pressing plate 3, the lower pressing plate 3 is made horizontal. Then, the steel wire rope 9 is pulled to move the moving rod 81 upward. At this time, the connecting frame 86 is separated from the short plate 87. Under the action of the second elastic member 566, the positioning tooth 565 is connected to the positioning hole 564 to fix the position of the positioning cylinder 53. While the moving rod 81 is moving, the shielding plate 62 can extend out of the limiting groove 61 and contact the inner wall of the pile hole, reducing the gap between the upper pressing plate 1 and the inner wall of the pile hole, facilitating the measurement operation.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0060] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only includes an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A measuring device for the lateral frictional resistance of a pile foundation, characterized in that, it includes: an upper pressing plate, a lower pressing plate is provided on the bottom side of the upper pressing plate, a limiting rod is installed on the bottom side edge of the upper pressing plate, the limiting rod penetrates through the lower pressing plate, the upper pressing plate is parallel to the lower pressing plate, and a steel reinforcement cage is installed at the top end of the upper pressing plate; a leveling component is installed on the bottom side of the lower pressing plate, which is used to make the lower pressing plate adapt to the shape of the inner bottom end of the pile hole and make the lower pressing plate horizontal; a shielding component is installed on the upper pressing plate, which is used to reduce the gap between the upper pressing plate and the inner wall of the pile hole. A plurality of anchor cable meters are evenly distributed between the upper pressing plate and the lower pressing plate. An adjusting component is installed on the lower pressing plate and the upper pressing plate, which is used to fix the leveling component and make the shielding component extend out of the upper pressing plate; the leveling component includes: a fixed frame, installed on the lower pressing plate, a positioning rod is installed inside the fixed frame, a positioning cylinder is provided outside the positioning rod, the positioning cylinder penetrates through the lower pressing plate, a support seat is installed at the bottom end of the positioning cylinder, and a first elastic member is installed between the positioning cylinder and the positioning rod, which is used to adjust the position of the positioning cylinder on the positioning rod; a fixing component is also installed on the lower pressing plate and the positioning cylinder, which is used to fix the position of the positioning cylinder on the positioning rod; the fixing component includes: a fixed block, fixedly installed on the lower pressing plate, a long rod is installed on the fixed block, the long rod penetrates through the fixed block, a moving cylinder is close to one side of the fixed block and fixedly installed on the fixing plate, a plurality of positioning holes are evenly distributed on the fixing plate, a positioning tooth is fixedly installed at one end of the long rod close to the moving cylinder, and the positioning tooth is in concave-convex connection with the positioning hole; a second elastic member is installed at the other end of the long rod, one end of the second elastic member is connected to the lower pressing plate, and the other end is connected to the long rod, which is used to adjust the position of the long rod on the fixed block and make the positioning tooth connected to the positioning hole.

2. The measuring device for the lateral frictional resistance of a pile foundation according to claim 1, characterized in that, the shielding component includes: a limiting groove, located on the upper pressing plate and is horizontal, a shielding plate is installed inside the limiting groove, the shape of the shielding plate is arc-shaped, slot holes are provided on both sides of the shielding plate, and folding plates are installed inside the slot holes; a sliding groove is provided inside the limiting groove, a sliding bar is installed on the shielding plate, and the sliding bar is in concave-convex connection with the sliding groove, which is used to limit the moving track of the shielding plate.

3. The measuring device for the lateral frictional resistance of a pile foundation according to claim 2, characterized in that, the adjusting component includes: a moving rod, penetrating through the upper pressing plate and extending into the inside of the fixed frame, the moving rod is vertical and located in the middle of the upper pressing plate, a disc is installed outside the moving rod, a first hinge seat is installed outside the disc, a second hinge seat is fixedly installed at the bottom side of one end of the shielding plate close to the moving rod, and a connecting rod is installed between the first hinge seat and the second hinge seat, and both ends of the connecting rod are rotatably connected to the first hinge seat and the second hinge seat; a connecting frame is installed at one end of the moving rod extending into the inside of the fixed frame, the cross-sectional shape of the connecting frame is inverted U-shaped, and a short plate is fixedly installed at one end of the long rod close to the connecting frame; A positioning component is installed between the moving rod and the upper pressing plate for limiting the position of the moving rod on the upper pressing plate.

4. The measuring device for the lateral frictional resistance of a pile foundation according to claim 3, characterized in that the positioning component includes: Positioning grooves, which are located on the upper pressing plate and on both sides of the moving rod. A short rod is installed inside the positioning grooves. A third elastic member is installed between the short rod and the positioning grooves. One end of the short rod extending out of the positioning groove is fixedly installed with a first rack. A placing groove is provided on the outer side of the moving rod, and a second rack is installed inside the placing groove.

5. The measuring device for the lateral frictional resistance of a pile foundation according to claim 3, characterized in that A steel wire rope is installed at the top of the moving rod, and a steel bar meter is installed on the steel reinforcement cage. There are multiple steel bar meters and they are evenly distributed on the steel reinforcement cage.

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