An inflatable sleeve device for eliminating side resistance of a test pile

Abstract

The application discloses an inflatable sleeve device for eliminating the side resistance of a test pile, which comprises a base pile reinforcement cage, a ring reinforcement fixing support, a ring reinforcement, a ring-shaped thin plate and a ring-shaped air bag, one end of the ring reinforcement fixing support is connected to the periphery of the base pile reinforcement cage, the other end of the ring reinforcement fixing support is connected to the ring reinforcement, the ring-shaped thin plate is connected to the periphery of the ring reinforcement, and the ring-shaped air bag is sleeved on the periphery of the ring-shaped thin plate. The application has the beneficial effects that the ring-shaped air bag is arranged, the reinforcement cage is fixed and the base pile does not rise in the mold by pressurizing and inflating the ring-shaped air bag in the base pile construction stage, the ring-shaped air bag is deflated and discharged in the test pile stage, and a certain gap is formed between the pile side wall and the surrounding soil, so that the side resistance of the test pile and the soil around the pile is eliminated. The ring-shaped air bag can be used again after being taken out, and the device has the advantages of simple structure, convenient implementation, reusability, good economy, and real and reliable results.

Description

Technical Field

[0001] This invention relates to the field of single pile bearing capacity testing technology, and in particular to an inflatable sleeve device for eliminating the side resistance of test piles. Background Technology

[0002] To test the feasibility of pile foundation construction technology and verify the reliability of design parameters and whether the bearing capacity can meet design requirements, the bearing capacity of pile foundations of some buildings needs to be tested according to the specifications.

[0003] 1. For example, Chinese patent discloses a self-balancing hydraulic bladder casing for eliminating the side resistance of the ineffective section of a test pile (publication number: CN211312625U), which relates to the field of side resistance of the ineffective section of a test pile. The casing includes a casing with a hydraulic bladder movably connected to its inner wall. A hydraulic bladder pressure-relief pipe is fixedly connected to one side of the top of the hydraulic bladder. A sealing connector mechanism is fixedly connected to the top of the hydraulic bladder pressure-relief pipe. A pressure-regulating pipe is fixedly connected to the other side of the top of the hydraulic bladder. A pressure-regulating valve is fixedly connected to the top of the pressure-regulating pipe. An effective section of the test pile is movably connected to the lower part of the casing. An ineffective section of the test pile is fixedly connected to the bottom of the effective section. Reinforcing cages are fixedly installed in the middle of both the effective and ineffective sections of the test pile. The structure is simple and reasonable, and easy to manufacture. It combines the currently mature steel casing with a hydraulic bladder, applying corresponding pressure to the unit hydraulic bladder.

[0004] 2. For example, Chinese patent discloses a device for eliminating the side friction of an ineffective section of a test pile (Publication No.: CN206829204U), which includes a casing, a flexible membrane wrapped around the outer circumference of a portion of the reinforcing cage to form a membrane section, the inner wall of the casing being coated with lubricant and fitted onto the outside of the membrane section, the length of the casing being equal to the length of the ineffective section of the test pile, the inner end of the casing near the end of the effective section of the test pile having a chamfer, the length of the membrane section being equal to the length of the ineffective section of the test pile, and an anti-turbulence section being provided at the end of the membrane section near the effective section of the test pile. This structure is simple, reasonable, and easy to use. It can effectively establish physical isolation between the pile body and the soil beside the pile in the target area where side friction is eliminated, fully utilizing the characteristics of the foundation pile construction process and the pile material to achieve the purpose of eliminating pile side friction, providing accurate test data for test pile testing, and reducing project costs.

[0005] Since the bearing capacity test of the foundation piles needs to be carried out 28 days after the completion of the concrete pouring, which takes a long time, the test piles need to be carried out in advance. In order to avoid unnecessary trouble caused by the test piles in the foundation pit to the later excavation of the foundation pit, under the condition of comprehensive analysis of the geological survey, some projects can be tested on the ground outside the site near the foundation pit. At this time, there is often a certain length from the natural ground to the top elevation of the pile, and the lateral resistance of this section cannot be ignored. However, the lateral resistance mentioned in the geological survey report itself has a certain deviation. There is currently no good way to accurately determine the lateral resistance of this section.

[0006] Therefore, it is necessary to propose an inflatable sleeve device to eliminate the side resistance of the test pile in order to address the above problems. Summary of the Invention

[0007] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an inflatable sleeve device for eliminating the side resistance of test piles, so as to solve the above problems.

[0008] An inflatable sleeve device for eliminating the side resistance of a test pile includes a pile reinforcement cage, a ring reinforcement fixing support, a ring reinforcement, an annular thin plate, and an annular airbag. One end of the ring reinforcement fixing support is connected to the periphery of the pile reinforcement cage, and the other end of the ring reinforcement fixing support is connected to the ring reinforcement. The annular thin plate is connected to the periphery of the ring reinforcement, and the annular airbag is fitted around the periphery of the annular thin plate.

[0009] Preferably, one end of the ring reinforcement fixing support is welded to the outer periphery of the pile reinforcement cage.

[0010] Preferably, the ring reinforcement fixing supports are evenly arranged around the periphery of the pile reinforcement cage, with no fewer than four at the same height, and the spacing along the pile length direction of the pile reinforcement cage is no more than three times the stirrup spacing.

[0011] Preferably, the other end of the ring reinforcement fixing support is welded to the ring reinforcement.

[0012] Preferably, the annular thin plate is tied around the periphery of the ring reinforcement.

[0013] Preferably, the annular thin plate has an outwardly extending edge at the lower part of the annular airbag.

[0014] Preferably, the annular thin plate can be a plastic plate or a steel plate, but is not limited to plastic plates or steel plates.

[0015] Preferably, the annular airbag is attached to the outer periphery of the annular thin plate by an adhesive sleeve (cloverleaf-shaped adhesive points), and the adhesive strength is sufficient to fix the airbag without affecting its subsequent removal.

[0016] Preferably, the upper part of the annular airbag is provided with an inflation valve, an deflation valve, and a pressure gauge.

[0017] Preferably, the annular airbag can be made of rubber or other inflatable materials.

[0018] Compared with the prior art, the present invention has the following advantages: The present invention sets up an annular airbag, which is pressurized and inflated during the foundation pile construction stage to fix the steel cage and prevent the foundation pile from expanding. During the test pile stage, the annular airbag is depressurized and removed, and a certain gap is formed between the pile sidewall and the surrounding soil, thereby eliminating the lateral resistance between the test pile and the surrounding soil. The annular airbag can be reused after being removed. Moreover, the device is simple in structure, easy to implement, reusable, and has good economic efficiency, and the results are real and reliable. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structural elevation of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the present invention;

[0021] Figure 3 This is a partial structural diagram of the present invention;

[0022] Figure 4 This is a structural diagram of the annular airbag of the present invention.

[0023] The attached diagram is labeled as follows: 1. Foundation pile reinforcement cage; 2. Ring reinforcement fixing support; 3. Ring reinforcement; 4. Annular thin plate; 41. Outer canopy; 5. Annular airbag; 51. Inflation valve; 52. De-inflation valve; 53. Pressure gauge. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0028] like Figure 1 and combined Figures 2 to 4 As shown, an inflatable sleeve device for eliminating the side resistance of a test pile includes a pile reinforcement cage 1, a ring reinforcement fixing support 2, a ring reinforcement 3, an annular thin plate 4, and an annular airbag 5. One end of the ring reinforcement fixing support 2 is connected to the periphery of the pile reinforcement cage 1, and the other end of the ring reinforcement fixing support 2 is connected to the ring reinforcement 3. The annular thin plate 4 is connected to the periphery of the ring reinforcement 3, and the annular airbag 5 is fitted around the periphery of the annular thin plate 4.

[0029] Furthermore, one end of the ring reinforcement fixing support 2 is welded to the outer periphery of the foundation pile reinforcement cage 1.

[0030] Furthermore, the ring reinforcement fixing supports 2 are evenly arranged around the periphery of the pile reinforcement cage 1. There are no fewer than 4 ring reinforcement fixing supports at the same height around the periphery of the pile reinforcement cage 1, and the spacing along the pile length direction of the pile reinforcement cage 1 is no more than 3 times the spacing of the stirrups (stirrups of the pile reinforcement cage 1).

[0031] Furthermore, the other end of the ring reinforcement fixing support 2 is welded to the ring reinforcement 3.

[0032] Furthermore, the annular thin plate 4 is tied around the periphery of the ring reinforcement 3.

[0033] Furthermore, the annular thin plate 4 is provided with an outwardly extending eave 41 at the lower part of the annular airbag 5.

[0034] Furthermore, the annular thin plate 4 can be made of plastic or steel, but is not limited to either plastic or steel.

[0035] Furthermore, the annular airbag 5 is bonded to the periphery of the annular thin plate 4 with an adhesive sleeve (cloverleaf-shaped bonding), and the bonding strength is sufficient to fix it without affecting the subsequent removal of the annular airbag 5.

[0036] Furthermore, the upper part of the annular airbag 5 is provided with an inflation valve 51, an deflation valve 52, and a pressure gauge 53.

[0037] Furthermore, the annular airbag 5 can be made of rubber or other inflatable materials.

[0038] Compared with the prior art, the present invention has the following advantages: The present invention sets up an annular airbag 5. During the foundation pile construction stage, the annular airbag 5 is pressurized and inflated to fix the steel cage and prevent the foundation pile from expanding. During the test pile stage, the annular airbag is depressurized and removed. A certain gap is formed between the pile sidewall and the surrounding soil, thereby eliminating the lateral resistance between the test pile and the surrounding soil. The annular airbag 5 can be reused after being removed. Moreover, the device is simple in structure, easy to implement, reusable, and has good economic efficiency. The results are real and reliable.

[0039] Working principle: After the foundation pile reinforcement cage 1 is tied, the pre-fabricated ring reinforcement fixing supports 2 are welded to the foundation pile reinforcement cage 1. The horizontal and vertical spacing of the ring reinforcement fixing supports 2 can be adjusted according to specific conditions, but the ring reinforcement fixing supports 2 should be able to ensure their own stability and the overall stability after welding with the ring reinforcement 3. After the ring reinforcement fixing supports 2 are welded and the welding quality is found to be good, the ring reinforcement 3 is welded to the ring reinforcement fixing supports 2. After welding, the overall stability of the ring reinforcement 3 and the ring reinforcement fixing supports 2 is checked. If the overall stability of the ring reinforcement 3 and the ring reinforcement fixing supports 2 is found to be poor, reinforcement bars can be arranged in the direction perpendicular to the ring reinforcement 3 (i.e., along the length of the foundation pile reinforcement cage 1) to form a reinforcement mesh with the ring reinforcement 3 to increase the stability of the ring reinforcement 3. The above system is then established. Then, the annular thin plate 4 and the ring reinforcement 3 are tied together or other fixing measures are taken to ensure a stable connection between the annular thin plate 4 and the ring reinforcement 3. After the above system is assembled, adhesive is dotted on the annular thin plate 4, and the annular airbag 5 is inflated with a small amount of pressure to make it slightly expand, and then bonded and fixed to the annular thin plate 4. During the process of laying the foundation pile reinforcement cage 1, protective measures are taken for the annular airbag 5 to prevent the annular airbag 5 from falling off. After the foundation pile reinforcement cage 1 is lowered, the annular airbag 5 is inflated and fixed by the inflation valve 51 on the annular airbag 5. During the inflation and fixing process, the positioning of the foundation pile reinforcement cage 1 is ensured. After the pile body concrete is poured, the annular airbag 5 can be deflated by the deflation valve 52 after the concrete strength meets the requirements, and the annular airbag 5 can be removed for use in other foundation piles.

[0040] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An inflatable sleeve device for eliminating the side resistance of a test pile, characterized in that: The system includes a pile reinforcement cage (1), a ring reinforcement fixing support (2), a ring reinforcement (3), an annular thin plate (4), and an annular airbag (5). One end of the ring reinforcement fixing support (2) is connected to the periphery of the pile reinforcement cage (1), and the other end of the ring reinforcement fixing support (2) is connected to the ring reinforcement (3). The annular thin plate (4) is connected to the periphery of the ring reinforcement (3), and the annular airbag (5) is fitted around the periphery of the annular thin plate (4). One end of the ring reinforcement fixing support (2) is welded to the periphery of the pile reinforcement cage (1). The reinforcement fixing supports (2) are evenly arranged around the periphery of the pile reinforcement cage (1), with no less than 4 at the same height. The spacing of the ring reinforcement fixing supports (2) along the pile length direction of the pile reinforcement cage (1) is no more than 3 times the spacing of the stirrups. The other end of the ring reinforcement fixing supports (2) is welded to the ring reinforcement (3). The annular thin plate (4) is tied around the periphery of the ring reinforcement (3). The annular thin plate (4) has an overhang (41) at the bottom of the annular airbag (5). The annular thin plate (4) can be made of plastic or steel, but is not limited to plastic or steel.

2. The inflatable sleeve device for eliminating the side resistance of a test pile as described in claim 1, characterized in that: The annular airbag (5) is glued to the periphery of the annular thin plate (4) with an adhesive.

3. The inflatable sleeve device for eliminating the side resistance of a test pile as described in claim 1, characterized in that: The annular airbag (5) is equipped with an inflation valve (51), an deflation valve (52) and a pressure gauge (53) on its upper part.

4. The inflatable sleeve device for eliminating the side resistance of a test pile as described in claim 1, characterized in that: The annular airbag (5) can be made of rubber or other inflatable materials.

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