Concrete pipe pile and uplift test method

Abstract

The invention discloses a concrete pipe pile and an anti-pulling test method.The concrete pipe pile comprises a reinforcement cage assembly, a pile body assembly, a threaded reinforcing rib, a sealing cover and a steel cylinder, the pile body assembly is composed of a reinforcing top sleeve, a reinforcing bottom sleeve, a pile tip and a concrete pile body, and the threaded reinforcing rib with the circular section is wound around the periphery of the concrete pile body; the concrete pile body is of a hollow structure, a steel cylinder is arranged in the concrete pile body in a sleeved mode, a reinforcement cage assembly is arranged in the concrete pile body, the reinforcement cage assembly is composed of longitudinal steel bars, positioning rings and spiral stirrups, and the positioning rings are welded in the longitudinal steel bars at equal intervals. According to the novel concrete pipe pile and the pulling resistance testing method, the pulling resistance of the pile body can be improved, and an existing pulling resistance testing method is simple, good in safety and suitable for wide application and popularization.

Description

Technical Field

[0001] The invention relates to the technical field of concrete pipe pile testing, and in particular to a concrete pipe pile and a pull-out resistance testing method. Background Art

[0002] Concrete pipe pile is a kind of prefabricated concrete pile, which has the characteristics of high single pile bearing capacity, low unit bearing capacity cost, fast construction speed and reliable pile quality. It is often used in construction, railways, highways, bridges, ports, docks and other projects, especially in soft soil, clay, silt, sand and fully weathered rock formation conditions. After the pile is sunk, the pull-out test method is needed to detect the pull-out resistance of the pile body.

[0003] The concrete pipe pile and the pull-out test method have the following disadvantages: 1. The pull-out resistance of the pile body cannot be improved and the existing pull-out test method is relatively complex and has poor safety. To this end, we propose a concrete pipe pile and a pull-out test method. Summary of the invention

[0004] The main purpose of the present invention is to provide a concrete pipe pile and a pull-out test method, which can effectively solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A concrete pipe pile comprises a steel cage assembly, a pile body assembly, threaded reinforcement ribs, a sealing cover and a steel cylinder, wherein the pile body assembly is composed of a reinforcement top sleeve, a reinforcement bottom sleeve, a pile tip and a concrete pile body, the outer periphery of the concrete pile body is wound with threaded reinforcement ribs with a circular cross section, the concrete pile body is a hollow structure and a steel cylinder is sleeved inside the concrete pile body, a steel cage assembly is arranged inside the concrete pile body, the steel cage assembly is composed of longitudinal steel bars, a positioning ring and spiral hoop bars, positioning rings are welded at equal distances inside the longitudinal steel bars, and the concrete pipe pile is provided with a steel cage assembly. The steps of the pull-out test method are as follows: Step 1: Install the loading device. First, lay a 5 cm thick sand cushion layer on both sides of the concrete pile body and level it to ensure that its density and rigidity are sufficient to support the upper loading device; Step 2: Place the jack pad and the jack in sequence from bottom to top at this position, and connect the output shaft of the jack to the reaction beam; Step 3: Install the anchor of the longitudinal steel bar in the middle part of the reaction beam; Step 4: Use the jack to push the reaction beam so that the reaction beam drives the longitudinal steel bar to move upward, thereby detecting the pull-out resistance of the concrete pile body.

[0007] Furthermore, twelve longitudinal steel bars are specifically provided and spiral stirrups with circular cross-sections are welded and wrapped around the outer sides of the longitudinal steel bars. The steel cage assembly composed of the longitudinal steel bars, positioning rings and spiral stirrups increases the strength, rigidity and stability of the concrete pipe pile.

[0008] Furthermore, a reinforcing top sleeve is provided on the top end of the concrete pile body.

[0009] Furthermore, a reinforcing bottom sleeve is provided at the bottom end of the concrete pile body.

[0010] Furthermore, a sealing cover is clamped on the top of the steel cylinder.

[0011] Furthermore, a pile tip is connected to the bottom of the concrete pile body, and the pile tip is used to reduce friction resistance when the concrete pile body is buried in the soil, thereby improving the burial efficiency.

[0012] Furthermore, the outer surface of the concrete pile body is sprayed with a cured protective coating, and the cured protective coating is specifically an organic silicon coating, so that the outer surface of the concrete pile body is corrosion-resistant and has a certain waterproof effect. The coating is not easy to peel off and is durable.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. A concrete pipe pile and a pull-out test method of the present invention utilize a reinforced top sleeve and a reinforced bottom sleeve at the top and bottom ends of a concrete pile body to improve the integrity of the ends of the concrete pile body, so that no cracks will be generated after being subjected to force, and the threaded reinforcement ribs between the reinforced top sleeve and the reinforced bottom sleeve can increase the friction between the top sleeve and the reinforced bottom sleeve and the soil layer, thereby increasing the pull-out resistance of the concrete pipe pile and improving its bearing capacity.

[0015] 2. A concrete pipe pile and a pull-out test method of the present invention utilize a steel cage assembly composed of longitudinal steel bars, positioning rings and spiral stirrups to increase the strength, rigidity and stability of the concrete pipe pile. The outer surface of the concrete pile body is sprayed with a cured protective coating, and the cured protective coating is specifically an organic silicon coating, so that the outer surface of the concrete pile body is corrosion-resistant and has a certain waterproof effect. The coating is not easy to peel off and is durable. The concrete pipe pile and the pull-out test method are relatively simple, highly safe, easy to operate, highly practical, and suitable for wide promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The present invention is a schematic diagram of the overall structure of a concrete pipe pile and a pull-out test method.

[0017] Figure 2 This is a large-scale drawing of location A of a concrete pipe pile and a pull-out test method of the present invention.

[0018] Figure 3 The present invention is a schematic diagram of a sealing cover structure of a concrete pipe pile and a pull-out resistance testing method.

[0019] Figure 4 The present invention is a schematic diagram of a cured protective coating structure of a concrete pipe pile and a pull-out test method.

[0020] In the figure: 1. steel cage assembly; 101. longitudinal steel bars; 102. positioning ring; 103. spiral stirrups; 2. pile body assembly; 201. reinforced top sleeve; 202. reinforced bottom sleeve; 203. pile tip; 204. concrete pile body; 3. threaded reinforcement ribs; 4. sealing cover; 5. steel cylinder; 6. cured protective coating. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0022] like Figure 1-4 As shown, a concrete pipe pile comprises a steel cage assembly 1, a pile body assembly 2, a threaded reinforcement rib 3, a sealing cover 4 and a steel cylinder 5, wherein the pile body assembly 2 is composed of a reinforcement top sleeve 201, a reinforcement bottom sleeve 202, a pile tip 203 and a concrete pile body 204, the outer periphery of the concrete pile body 204 is wound with a threaded reinforcement rib 3 with a circular cross section, the concrete pile body 204 is a hollow structure and the concrete pile body 204 is sleeved with a steel cylinder 5, the concrete pile body 204 is provided with a steel cage assembly 1, the steel cage assembly 1 is composed of a longitudinal steel bar 101, a positioning ring 102 and a spiral hoop 103, the longitudinal steel bar 101 is etc. There is a positioning ring 102 welded at a distance, and the pull-out test method of the concrete pipe pile has the following steps: step 1: install the loading device, first lay a 5 cm thick sand cushion layer on both sides of the concrete pile body 204 and level it to ensure that its density and rigidity can be sufficient to support the upper loading device; step 2: place the jack pad and the jack in sequence from bottom to top at this position, and connect the output shaft of the jack to the reaction beam; step 3: install the anchor of the longitudinal steel bar 101 in the middle part of the reaction beam; step 4: use the jack to push the reaction beam, so that the reaction beam drives the longitudinal steel bar 101 to move upward, thereby detecting the pull-out resistance of the concrete pile body 204.

[0023] Specifically, twelve longitudinal steel bars 101 are provided, and spiral stirrups 103 with a circular cross-section are welded and wound around the outer sides of the longitudinal steel bars 101 .

[0024] In this embodiment, Figure 1 , 2 As shown, the steel cage assembly 1 composed of the longitudinal steel bars 101, the positioning rings 102 and the spiral stirrups 103 increases the strength, rigidity and stability of the concrete pipe pile.

[0025] Wherein, a reinforcing top sleeve 201 is provided at the top end of the concrete pile body 204 .

[0026] In this embodiment, Figure 1 As shown, the integrity of the end of the concrete pile body 204 can be improved, and no cracks will be generated after being subjected to force.

[0027] Wherein, the bottom end of the concrete pile body 204 is sleeved with a reinforcing bottom sleeve 202 .

[0028] In this embodiment, Figure 1 As shown, the integrity of the end of the concrete pile body 204 can be improved, and no cracks will be generated after being subjected to force.

[0029] Wherein, a sealing cover 4 is clamped on the top of the steel cylinder 5.

[0030] In this embodiment, Figure 3 As shown, the sealing cover 4 is used to seal the steel cylinder 5.

[0031] The bottom of the concrete pile body 204 is connected with a pile tip 203 .

[0032] In this embodiment, Figure 1 As shown, the pile tip 203 is used to reduce the friction resistance of the concrete pile body 204 when it is buried in the soil, thereby improving the burial efficiency.

[0033] The outer surface of the concrete pile body 204 is sprayed with a cured protective coating 6, and the cured protective coating 6 is specifically an organic silicon coating.

[0034] In this embodiment, Figure 1 , 4 As shown, the outer surface of the concrete pile body 204 is corrosion-resistant and has a certain waterproof effect. The coating is not easy to peel off and is durable.

[0035] It should be noted that the present invention is a concrete pipe pile and a pull-out test method. When working, the reinforced top sleeve 201 and the reinforced bottom sleeve 202 at the top and bottom of the concrete pile body 204 can improve the integrity of the end of the concrete pile body 204, and no cracks will be generated after being subjected to force. The threaded reinforcing ribs 3 between the reinforced top sleeve 201 and the reinforced bottom sleeve 202 can increase the friction between the soil layer and the pull-out resistance of the concrete pipe pile, thereby improving its bearing capacity. The steel cage assembly 1 composed of the longitudinal steel bars 101, the positioning ring 102 and the spiral hoop bars 103 increases the strength, rigidity and stability of the concrete pipe pile. The outer surface of the concrete pile body 204 is sprayed with a cured protective coating 6, and the cured protective coating 6 is specifically an organic silicon coating, so that the outer surface of the concrete pile body 204 is corrosion-resistant and has a certain waterproof effect. The coating is not easy to peel off and is durable. The concrete pipe pile and the pull-out test method are relatively simple, highly safe, easy to operate, and highly practical, and are suitable for wide promotion and use.

[0036] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the present invention, unless otherwise clearly specified and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection;

[0038] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A concrete pipe pile, comprising a steel cage assembly (1), a pile body assembly (2), threaded reinforcement bars (3), a sealing cover (4) and a steel cylinder (5), characterized in that: The pile body assembly (2) is composed of a reinforced top sleeve (201), a reinforced bottom sleeve (202), a pile tip (203) and a concrete pile body (204); the outer periphery of the concrete pile body (204) is wound with a threaded reinforcing rib (3) with a circular cross section; the concrete pile body (204) is a hollow structure and a steel cylinder (5) is sleeved inside the concrete pile body (204); a steel cage assembly (1) is arranged inside the concrete pile body (204); the steel cage assembly (1) is composed of a longitudinal steel bar (101), a positioning ring (102) and a spiral stirrup (103); the longitudinal steel bar (101) is welded with a positioning ring (102) at equal distances. 102), the pull-out test method of the concrete pipe pile comprises the following steps: step 1: installing a loading device, first laying a 5 cm thick sand cushion layer on both sides of the concrete pile body (204) and leveling it to ensure that its density and rigidity are sufficient to support the upper loading device; step 2: placing a jack pad and a jack in sequence from bottom to top at the position, and connecting the output shaft of the jack to the reaction beam; step 3: installing an anchor of the longitudinal steel bar (101) at the middle part of the reaction beam; step 4: using the jack to push the reaction beam, so that the reaction beam drives the longitudinal steel bar (101) to move upward, thereby detecting the pull-out resistance of the concrete pile body (204).

2. A concrete pipe pile and pull-out test method according to claim 1, characterized in that: Specifically, twelve longitudinal steel bars (101) are provided, and spiral stirrups (103) with a circular cross section are welded and wound around the outer sides of the longitudinal steel bars (101).

3. A concrete pipe pile and pull-out test method according to claim 1, characterized in that: The top end of the concrete pile body (204) is sleeved with a reinforcing top sleeve (201).

4. A concrete pipe pile and pull-out test method according to claim 1, characterized in that: The bottom end of the concrete pile body (204) is sleeved with a reinforcing bottom sleeve (202).

5. A concrete pipe pile and pull-out test method according to claim 1, characterized in that: A sealing cover (4) is clamped on the top of the steel cylinder (5).

6. A concrete pipe pile and pull-out test method according to claim 1, characterized in that: The bottom of the concrete pile body (204) is connected to a pile tip (203).

7. A concrete pipe pile and pull-out test method according to claim 1, characterized in that: The outer surface of the concrete pile body (204) is sprayed with a cured protective coating (6), and the cured protective coating (6) is specifically an organic silicon coating.

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