CN203034498U - Horizontal bearing capability test device of piles in permafrost region - Google Patents

Abstract

The utility model discloses a test device for horizontal bearing capacity of piles in permafrost regions, which comprises a test pile and two reaction piles arranged in a triangle. One end of the jack is connected, the other end of the hydraulic jack is connected with the reaction beam, and the reaction pile and the steel sheet pile are arranged close to the reaction beam, and the outermost side of the reaction pile and the steel sheet pile is in a line close to the reaction beam. The utility model adds steel sheet piles, increases the reaction force of the horizontal force, can greatly reduce the displacement of the reaction piles, and ensures that the horizontal bearing capacity test of the piles in the permafrost region is consistent with the actual situation. The horizontal force of the hydraulic jack acts as a stress spreader, which prevents the top of the test pile from being crushed. The addition of high-strength bolts makes the connection between the hydraulic jack and the reaction beam more firm, avoids the separation of the hydraulic jack and the reaction beam, and increases the reliability and accuracy of the test.

Description

A horizontal bearing capacity test device for piles in permafrost regions

technical field

The utility model relates to a horizontal bearing capacity test device for engineering piles, in particular to a horizontal bearing capacity test device for piles in permafrost regions.

Background technique

Due to the impact of low temperature in permafrost regions, the freezing depth is relatively large. Compared with non-frozen soil regions, the elastic modulus and strength of the soil are greatly increased, so that the pile needs to be loaded with horizontal force per unit lateral displacement, especially It is a significant increase in the horizontal force required to load long-diameter piles in permafrost regions. At present, the method of triangular pile arrangement is adopted in engineering, that is, the pile at one vertex is the test pile, and the piles at the other two vertices are reaction piles. This will cause a large displacement of the two reaction piles, making the test The horizontal bearing capacity of the pile is quite different from the actual horizontal bearing capacity, and the test results cannot be directly used in the design of the pile foundation. In addition, because no active measures are taken to protect the top of the test pile, the point where the horizontal pressure of the test pile is easily damaged crushed, resulting in the failure of the horizontal bearing capacity test.

Utility model content

One of the purposes of the present utility model is to provide a horizontal bearing capacity test device for piles in permafrost regions, so as to solve the problem in the prior art that the horizontal bearing capacity tests of piles in permafrost regions are inconsistent with actual conditions.

Another purpose of the utility model is to solve the problem that the point where the horizontal pressure of the test pile is easily crushed.

The technical scheme adopted by the utility model includes: a horizontal bearing capacity test device for piles in permafrost regions, including a test pile and two reaction piles arranged in a triangle, and pile sheaths are arranged on the test piles. The pile sheath is connected to one end of the hydraulic jack, and the other end of the hydraulic jack is connected to the reaction beam, and the reaction pile and the steel sheet pile are arranged close to the reaction beam, and the reaction pile and the steel sheet pile are close to the outermost side of the reaction beam in a line.

The connection between the pile sheath and the test pile is filled with cement mortar.

One end of the hydraulic jack is welded to the pile sheath.

The other end of the hydraulic jack is connected to the reaction beam with high-strength bolts or welding.

The steel sheet piles are replaced by I-beams, steel pipe piles or reinforced concrete piles.

The thickness of the steel sheet pile is 80-100mm, and the length is 5000-8000mm.

The diameter of the pile sheath is 4-8mm larger than that of the test pile, and the thickness of the pile sheath is 20-25mm.

The thickness of the reaction beam is not less than 300mm, and the length is 4000-5000mm.

Compared with the prior art, the beneficial effect of the utility model is: the hydraulic jack provides the horizontal thrust of the horizontal bearing capacity test of the pile; The test pile provides the reaction force of the horizontal thrust, enhances the reaction force of the horizontal thrust, and reduces the horizontal displacement of the reaction pile. The function of the high-strength bolt is to closely connect the hydraulic jack with the reaction beam. The horizontal thrust plays the role of stress diffusion and prevents the top of the test pile from being crushed. The utility model has the advantages of adding steel sheet piles, increasing the reaction force of the horizontal force, greatly reducing the displacement of the reaction piles, and ensuring that the horizontal bearing capacity test of the piles in the permafrost region is consistent with the actual situation. The sheath acts as a stress spreader for the horizontal force of the hydraulic jack and prevents the top of the test pile from being crushed. The addition of high-strength bolts makes the connection between the hydraulic jack and the reaction beam more firm, avoids the separation of the hydraulic jack and the reaction beam, and increases the reliability and accuracy of the test.

Description of drawings

Fig. 1 is the structural representation of the horizontal bearing capacity test device of pile in permafrost region of the present utility model;

In the figure: 1-test pile, 2-reaction pile, 3-pile sheath, 4-steel sheet pile, 5-high-strength bolt, 6-hydraulic jack, 7-reaction beam.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figure 1, the horizontal bearing capacity test device of piles in the permafrost region of the utility model includes a test pile 1 and two reaction piles 2 arranged in a triangle, and a pile sheath 3 is arranged on the test pile 1 , the pile sheath 3 and the test pile 1 are filled and connected with cement mortar, the pile sheath 3 is welded to one end of the hydraulic jack 6, and the other end of the hydraulic jack 6 is connected to the reaction beam 7 with high-strength bolts 5, which are close to the reaction beam 7 Set up the reaction force pile 2 and the steel sheet pile 4, and the outermost side of the reaction force pile 2 and the steel sheet pile 4 close to the reaction force beam 7 is in a line.

The operation mainly includes the following steps: (1) sharpen the end of the steel sheet pile 4, and press the steel sheet pile 4 into a predetermined position with a static press. The thickness of the steel sheet pile 4 is 80-100mm, and the length is 5000-8000mm. (2) Prefabricate the pile sheath 3, and hammer the pile sheath 3 into the top of the test pile 1, fill the gap between the pile sheath 3 and the test pile 1 with cement mortar, and the diameter of the pile sheath 3 is larger than the test pile 1. The thickness of the pile sheath 3 is 4-8mm, and the thickness of the pile sheath 3 is 20-25mm. (3) Install the hydraulic jack 6, and weld one end of the hydraulic jack 6 to the pile sheath 3 firmly, and the other end of the hydraulic jack 6 is connected to the reaction beam 7 The high-strength bolts 5 are used to connect firmly, the thickness of the reaction beam 7 is not less than 300mm, and the length is 4000-5000mm. (4) Measure whether the outermost side of the steel sheet pile 4 and the reaction pile 2 close to the reaction beam 7 is in the A line, if it is, you can start the test, if not, add a pad between the steel sheet pile 4 and the reaction beam 7 until the outermost side of the steel sheet pile 4 and the reaction pile 2 close to the reaction beam 7 is measured Get in a line and start experimenting.

Above-mentioned steel sheet pile also can be replaced with I-beam or steel pipe pile, reinforced concrete pile.

Although the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative, rather than restrictive. Under the enlightenment of the utility model, without departing from the purpose of the utility model and the protection scope of the claims, many deformations can be made, and these all belong to the protection list of the utility model.

Claims (8)

1. the horizontal bearing capacity experimental rig of an ever-frozen ground district stake, comprise a test pile and two counter-force stakes of setting triangular in shape, it is characterized in that, described test pile is provided with a sheath, the stake sheath is connected with hydraulic jack one end, the hydraulic jack other end is connected with reaction beam, is close to reaction beam counter-force stake and steel sheet pile are set, and described counter-force stake and steel sheet pile are in a line near the outermost of reaction beam one side.

2. according to the horizontal bearing capacity experimental rig of the described ever-frozen ground of claim 1 district's stake, it is characterized in that, fill with cement mortar between described stake sheath and the test pile and be connected.

3. according to the horizontal bearing capacity experimental rig of the described ever-frozen ground of claim 1 district's stake, it is characterized in that described hydraulic jack one end is welded to connect with the stake sheath.

4. according to the horizontal bearing capacity experimental rig of the described ever-frozen ground of claim 1 district's stake, it is characterized in that, between the described hydraulic jack other end and the reaction beam with high-strength bolt or be welded to connect.

5. according to the horizontal bearing capacity experimental rig of the described ever-frozen ground of claim 1 district's stake, it is characterized in that described steel sheet pile replaces with i iron, steel pipe pile or reinforced concrete pile.

6. according to the horizontal bearing capacity experimental rig of the described ever-frozen ground of claim 1 district's stake, it is characterized in that the thickness of described steel sheet pile is 80-100mm, length is 5000-8000mm.

7. according to the horizontal bearing capacity experimental rig of the described ever-frozen ground of claim 1 district's stake, it is characterized in that the diameter of described stake sheath is than the big 4-8mm of test pile, the thickness of stake sheath is 20-25mm.

8. according to the horizontal bearing capacity experimental rig of the described ever-frozen ground of claim 1 district's stake, it is characterized in that the thickness of described reaction beam is not less than 300mm, length is 4000-5000mm.

Images