Pile static load test device and ground reinforcement method at the bottom of its footing

Abstract

The present invention discloses a pile static load test device and a method for reinforcing the ground at the bottom of a frame foot, comprising a soft soil area, a test pile, a jack, a bracket and a weight, wherein the test pile is inserted in the soft soil area, the jack is arranged at the upper end of the test pile, the weight is arranged on the bracket, and the frame feet of the bracket are located on both sides of the test pile, and the characteristics are: a pit is provided in the soft soil area corresponding to the frame feet, the inner wall and the top surface of the pit are provided with a geotextile, the geotextile is filled with a filler containing water-absorbing particles, the geotextile is sealed after the filler is filled, a pad is laid on the upper surface of the pit, and the frame feet are supported on the pad. The support frame can effectively prevent the frame feet of the bracket from sinking into the soft soil, and at the same time prevent the bracket from tilting, so that the bracket can maintain a good horizontal state, thereby making the experimental results more accurate.

Description

Technical Field

[0001] The present invention relates to a pile static load test device and also relates to a method for reinforcing the ground at the bottom of a footing in the pile static load test device. Background Art

[0002] At present, pile static load tests generally include soft soil areas, test piles, jacks, brackets and weights. The test piles are inserted in the soft soil areas, the jacks are located on the upper ends of the test piles, the weights are located on the brackets, and the bracket feet are located on both sides of the test piles. When the above-mentioned support frames are actually used, the brackets will sink into the soft soil and press on the jacks when the heavy objects are piled, causing the test piles to be stressed in advance (in fact, the jacks should be adjusted after the heavy objects are loaded to make the test piles stressed), resulting in inaccurate test results. In addition, the soft soil at the bracket feet on both sides of the bracket is prone to sinking differently, causing the bracket to tilt, further aggravating the inaccuracy of the test results. Summary of the invention

[0003] In view of the shortcomings of the background technology, the technical problem to be solved by the present invention is to provide a pile static load test device with more accurate test results. The present invention also discloses a method for reinforcing the ground at the bottom of the frame foot in the above pile static load test device.

[0004] To this end, the present invention is implemented by adopting the following technical solutions:

[0005] The pile static load test device comprises a soft soil area, a test pile, a jack, a bracket and a weight, wherein the test pile is inserted in the soft soil area, the jack is arranged at the upper end of the test pile, the weight is arranged on the bracket, and the bracket feet are located at both sides of the test pile. The device is characterized in that: a pit is opened in the soft soil area corresponding to the bracket feet, the inner wall and the top surface of the pit are provided with a geotextile, the geotextile is filled with a filler containing water-absorbing particles, the geotextile is sealed after the filler is filled, a pad is laid on the upper surface of the pit, and the bracket feet are supported on the pad.

[0006] Furthermore, the filler includes water-absorbing particles, building demolition waste and stones.

[0007] Furthermore, there is an arc-shaped protrusion in the center of the bottom of the pit, and the arc-shaped protrusion is made of soft soil.

[0008] The present invention also provides a method for reinforcing the ground at the bottom of the footing in the above-mentioned pile static load test device, comprising the following steps:

[0009] Step 1: Dig a pit in the soft soil area corresponding to the support foot, lay a geotextile in the pit, and fill the geotextile with building demolition waste, stones and water-absorbing particles;

[0010] Step 2: Close the opening of the geotextile and make it flush with the soft soil area, and place a pad on the geotextile;

[0011] Step 3: Place the bracket so that the bracket feet are on the pad, and place heavy objects on the bracket until the weight reaches the standard;

[0012] Step 4: Adjust the jack and conduct a test.

[0013] Technical effects of the present invention:

[0014] 1. When heavy objects are piled, the support and the pad are stressed, so that the filler in the geotextile is stressed to squeeze the soft soil in the arc-shaped convex part of the pit inward, thereby enhancing the bearing capacity and reducing settlement;

[0015] 2. The water-absorbing particles can absorb the moisture of the surrounding soil, solidify the soil around the pit, delay settlement, effectively prevent the support legs from sinking into the soft soil, and prevent the support from tilting, thus making the experimental results more accurate;

[0016] 3. The arc-shaped protrusions at the bottom of the pit can increase the water absorption area at the bottom, enhance the solidification of the soil at the bottom of the pit, and realize the support bracket to improve the test accuracy under low-cost conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention has the following accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0019] Reference Figure 1As shown, the pile static load test device provided by the present invention comprises a soft soil area 1, a test pile 2, a jack 3, a bracket 4 and a weight 5, wherein the test pile 2 is inserted in the soft soil area 1, the jack 3 is arranged at the upper end of the test pile 2, the weight is arranged on the bracket 4, the legs 6 of the bracket 4 are located on both sides of the test pile 2, the soft soil area 1 is provided with a pit 7 corresponding to the legs 6, the inner wall of the pit 7 and the top surface of the pit 7 are provided with a geotextile 8, the geotextile 8 is filled with a filler containing water-absorbing particles, the filler includes water-absorbing particles, construction demolition waste and stones, the geotextile 8 is sealed after the filler is filled, the upper surface of the pit 7 is paved with a pad 9, and the legs 6 are supported on the pad 9. In order to improve the bearing capacity of the pit 7 area, the bottom center of the pit 7 has an arc-shaped protrusion 10, and the arc-shaped protrusion 10 is composed of soft soil. The above structure has the following technical effects: 1. When heavy objects are piled on the support and the pad, stress is applied to the filler in the geotextile, which squeezes the soft soil in the arc-shaped protrusion in the pit inward, thereby enhancing the bearing capacity and reducing settlement; 2. The water-absorbing particles can absorb moisture from the surrounding soil, solidify the soil around the pit, delay settlement, and effectively prevent the support legs from sinking into the soft soil and tilting, thereby making the experimental results more accurate; 3. The arc-shaped protrusion at the bottom of the pit can increase the water absorption area at the bottom, enhance the solidification of the soil at the bottom of the pit, and achieve the support of the support to improve the test accuracy under low-cost conditions.

[0020] In order to achieve better grading and form a denser filling, the proportion of the filler is: the mass ratio of 20-30mm particle size particles, 5-15MM particle size particles, and 0-5MM particle size particles is 4:3:3 respectively.

[0021] Reference Figure 1 As shown, the present invention also provides a method for reinforcing the ground at the bottom of the footing in the above-mentioned pile static load test device, comprising the following steps:

[0022] Step 1: Dig a pit in the soft soil area corresponding to the support foot, lay a geotextile in the pit, and fill the geotextile with building demolition waste, stones and water-absorbing particles;

[0023] Step 2: Close the opening of the geotextile and make it flush with the soft soil area, and place a pad on the geotextile;

[0024] Step 3: Place the bracket so that the bracket feet are on the pad, and place heavy objects on the bracket until the weight reaches the standard;

[0025] Step 4: Adjust the jack and conduct a test.

Claims

1. A pile static load test device, comprising a soft soil area, a test pile, a jack, a bracket and a weight, wherein the test pile is inserted in the soft soil area, the jack is arranged at the upper end of the test pile, the weight is arranged on the bracket, and the bracket feet are located at both sides of the test pile, wherein: The soft soil area is provided with a pit corresponding to the frame foot, the inner wall and the top surface of the pit are provided with a geotextile, the geotextile is filled with a filler containing water-absorbing particles, the bag mouth of the geotextile is closed after the filler is filled, the upper surface of the pit is paved with a pad, and the frame foot is supported on the pad; The filler includes water-absorbing particles, building demolition waste and stones; the bottom center of the pit is provided with an arc-shaped protrusion, which is composed of soft soil.

2. The pile static load test device according to claim 1 is characterized in that: The ratio of the filler is: the mass ratio of 20-30 mm particle size, 5-15 mm particle size, and 0-5 mm particle size is 4:3:3 respectively.

3. A method for reinforcing the ground at the bottom of the footing in the pile static load test device according to claim 1, comprising the following steps: Step 1: Dig a pit in the soft soil area corresponding to the support foot, lay a geotextile in the pit, and fill the geotextile with building demolition waste, stones and water-absorbing particles; Step 2: Close the opening of the geotextile and make it flush with the soft soil area, and place a pad on the geotextile; Step 3: Place the bracket so that the bracket feet are on the pad, and place heavy objects on the bracket until the weight reaches the standard; Step 4: Adjust the jack and conduct a test.

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