Process for treating broken anti-pull pile

Abstract

This invention relates to a process for treating broken piles with tensile strength, comprising a tensile strength device. The tensile strength device includes a strip-shaped clamping member with two through holes at both ends along its length. A reinforcing bar passes through the through holes. A pressure block and a tensile strength seat, larger than the diameter of the through hole, are respectively located at the upper and lower ends of the reinforcing bar. The treatment process includes: determining the location of the broken pile; cleaning the pile bore; and, in a bottom-to-top sequence, first pouring concrete into each section of the broken pile and then placing the tensile strength device inside. The length of the clamping member of the tensile strength device is greater than the diameter of the pile bore, and all clamping members are staggered. The reinforcing bar of the tensile strength device extends upwards beyond the top of the pile. After placing the tensile strength device in the uppermost broken pile, concrete is poured in until the pile bore is completely filled. The advantage is that using a clamping member slightly longer than the pile bore diameter as the tensile strength device to press against the borehole wall prevents the reinforcing bar from being pulled out or weakening the tensile strength effect due to concrete shrinkage and a smooth borehole wall.

Description

Technical Field

[0001] This invention relates to the field of building construction, and in particular to a process for treating broken anti-uplift piles. Background Technology

[0002] In the soft soil areas of Jiangsu and Zhejiang, the use of prestressed concrete pipe piles in foundation engineering is very common, and some of these pipe piles are also commonly used as tension piles. Full small-strain testing of pile foundations is conducted after the foundation pit is excavated. When a broken pile is detected, the reinforcement method typically involves installing replacement piles near the broken pile and simultaneously enlarging the foundation. This is especially important when the engineering piles are tension piles, requiring the installation of replacement piles. Since the earthwork has already been excavated, construction machinery has difficulty entering the foundation pit. When hammer pile drivers or static pressure pile drivers cannot enter the pit, or when the site is limited, cast-in-place piles are often used as replacements, resulting in higher project costs (construction costs and time costs).

[0003] Patent 201310370064.6 discloses a method for shortening the construction period and reducing costs in pile repair. The appendix to this patent... Figure 7 As can be seen, the main method of pile reinforcement involves grouting into the inner hole of the pipe pile (or core drilling for those without holes) and inserting reinforcing bars or a reinforcing cage, relying on the interaction between the grout and the reinforcing bars to achieve pile reinforcement. However, in pull-out piles, this method has the following drawbacks: the pull-out resistance or effectiveness of the reinforcing bars may deteriorate due to grout shrinkage or the smoothness of the pipe pile hole wall, thus there is still room for improvement.

[0004] Therefore, this case is brought. Summary of the Invention

[0005] The purpose of this invention is to provide a process for treating broken piles in anti-uplift piles to ensure the anti-uplift effect.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] A process for treating broken pull-out piles includes a pull-out device. The pull-out device includes a strip-shaped clamping member with two vertical through holes at both ends along its length. A reinforcing bar passes through the through holes. A pressure block is provided at the upper end of the reinforcing bar and a pull-out seat is provided at the lower end of the through hole. The size of the pressure block and the pull-out seat is larger than the diameter of the through hole.

[0008] The pile body is broken into several sections along its length. The process for treating broken piles includes the following steps:

[0009] S1. Determine the location of the broken pile;

[0010] S2. Clean the inside of the pile hole;

[0011] S3. Following the bottom-up sequence, each section of broken pile is first filled with concrete and then the pull-out device is placed in the construction operation; the length of the clamping member of the pull-out device is greater than the diameter of the pile hole, so that its two ends are clamped to the hole wall of the pile hole, and all clamping members are staggered, and the length of the steel bar of the pull-out device protrudes upwards from the top of the pile body.

[0012] S4. After the pull-out device is placed in the topmost broken pile, concrete is poured in until the pile hole is filled.

[0013] Furthermore, the process of inserting the pull-out device into the broken pile includes the following steps:

[0014] P1. Insert the clamping member into the pile hole with its two ends tilted, one up and one down respectively;

[0015] P2. After the clamping member reaches the designated position, the reinforcing bar at one end is pressed down and the reinforcing bar at the other end is pulled up. The pressure block on the pressing reinforcing bar causes the upward tilting end of the clamping member to move down, and the pull-out seat on the upward tilting reinforcing bar causes the downward tilting end of the clamping member to move up. During the process of being flattened, the clamping member presses against the wall of the inner hole of the pile at both ends.

[0016] Furthermore, when multiple pull-out devices are placed inside the same broken pile section, the distance between two adjacent upper and lower clamping members is 1m.

[0017] Furthermore, the concrete is micro-expansion self-compacting concrete.

[0018] Furthermore, if the broken pile is displaced before cleaning the inner hole of the pile, the position of the broken pile should be corrected first.

[0019] Furthermore, cleaning the inner hole of the pile includes the following steps:

[0020] T1. Remove soil and mud from the borehole;

[0021] T2. Clean the hole and drain the mud and water.

[0022] Furthermore, the reinforcing bar is a threaded steel bar.

[0023] Furthermore, the surface of the clamping member is provided with raised and recessed textures.

[0024] The advantages of this invention are: using a clamping member slightly longer than the inner diameter of the pile as an anti-pull-out device to press against the hole wall, preventing the steel bars from being pulled out or weakening the anti-pull-out effect due to concrete shrinkage and smooth hole wall. It is suitable for situations where the hollow pipe pile of the foundation is broken, and it can also be applied to the treatment of broken load-bearing piles, resulting in good overall economic benefits. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the pull-out resisting device in the embodiment;

[0026] Figure 2 This is a schematic diagram showing the state of the pull-out device being inserted into the hole in the embodiment;

[0027] Figure 3 This is a schematic diagram showing the state of the inner wall of the anti-pull-out device clamping hole in the embodiment;

[0028] Figure 4 This is a three-dimensional structural diagram of the broken pile after the anti-pull-out device is installed in the embodiment.

[0029] Figure 5 for Figure 4 A cross-sectional view;

[0030] Figure 6 for Figure 4 An explosion diagram;

[0031] Figure 7 for Figure 4 A bottom view diagram;

[0032] Figure 8 This is a flowchart illustrating the process of handling broken piles in the embodiment;

[0033] Label Explanation

[0034] 1-Pull-out device, 1a-First group of pull-out devices for lower section pile, 1b-Second group of pull-out devices for lower section pile, 1c-First group of pull-out devices for upper section pile, 1d-Second group of pull-out devices for upper section pile, 101-Tightening component, 102-Vertical reinforcement, 103-Pressure block, 104-Pull-out seat, 105-Through hole;

[0035] 201 - Lower pile section, 202 - Upper pile section, 203 - Pile break point;

[0036] 3-Micro-expansion self-compacting concrete;

[0037] 4-Soil inside the pile. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to embodiments. It should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., used in this document indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0039] like Figure 1As shown in the figure, this embodiment proposes an anti-pull-out device for treating broken piles, including a strip-shaped clamping member 101. Two vertical through holes 105 are formed at both ends of the clamping member 101 along its length. A vertical reinforcing bar 102 passes through the through holes 105. A pressure block 103 is provided at the upper end of the vertical reinforcing bar 102 in the through hole 105, and an anti-pull-out seat 104 is provided at the lower end of the through hole 105. The dimensions of the pressure block 103 and the anti-pull-out seat 104 are larger than the diameter of the through hole 105. To facilitate on-site fabrication of the clamping member 101, it can be made from leftover reinforcing bar material, preferably threaded reinforcing bar material. This allows the surface of the clamping seat to have a textured surface, improving the bonding strength with concrete. Two relatively long threaded steel bar scraps are cut to a length slightly larger than the inner diameter of the pile hole for the tension-resistant pile, and then welded together. This welding creates two through holes 105 between the two scraps for inserting vertical steel bars 102. The pressure block 103 on the vertical steel bar 102 can be made of round steel welded together, and the tension-resistant seat 104 on the vertical steel bar 102 can be formed using a threaded sleeve and a steel washer.

[0040] like Figure 4 As shown in this embodiment, it is assumed that the pile body is broken into two sections. Based on the pull-out force calculation, C35 micro-expansion self-compacting concrete needs to be poured into the pile body. At the same time, two pull-out devices 1 need to be placed in each broken pile section. The vertical steel bar 102 of the pull-out device 1 is HRB16. Preferably, the steel bar surplus of the clamping member 101 is HRB18.

[0041] like Figure 8 As shown, the process for handling broken piles includes the following steps (in this embodiment, the pile is a pipe pile; when this solution is used for piles without boreholes, the pile needs to be cored, and the cored depth needs to reach below the location of the broken pile):

[0042] S1. Determine the location of the broken pile from the small strain test. If the broken pile shows a positional deviation, first correct the position of the broken pile.

[0043] S2. Clean the pile hole, including removing soil and mud from the hole, washing the hole, and pumping out the mud and water inside the hole;

[0044] S3. For example Figures 5 to 7 As shown, micro-expansion self-compacting concrete is first poured in, the first set of anti-pull device 1a is placed in the lower section of the pile and adjusted into position, micro-expansion self-compacting concrete is poured in for the second time, then the second set of anti-pull device 1b is placed in the lower section of the pile and adjusted into position, and micro-expansion self-compacting concrete is poured in for the third time.

[0045] The first set of pull-out devices 1c is placed in the upper section of the pile and adjusted into position. The micro-expansion self-compacting concrete is poured for the fourth time. Then, the second set of pull-out devices 1d is placed in the upper section of the pile and adjusted into position. The micro-expansion self-compacting concrete is poured for the fifth time. At this point, the concrete has filled the inner hole of the pile.

[0046] Because the length of the clamping member 101 of the pull-out device 1 is greater than the diameter of the pile borehole, after adjustment and positioning, its two ends are clamped to the borehole wall; because the length of the vertical reinforcing bar 102 of the pull-out device 1 needs to be sufficient to protrude upwards above the top of the pile body, such as Figure 7 As shown, all the clamping members 101 need to be staggered (in this embodiment, when viewed from the top of the pile, all the clamping members 101 form a cross shape) so that all the vertical reinforcing bars 102 can extend upwards to the top of the hole.

[0047] like Figure 2 and Figure 3 As shown, in step S3 above, the adjustment and positioning step of the pull-out device 1 includes:

[0048] P1. Since the length of the clamping member 101 is greater than the inner diameter of the pile hole, the clamping member 101 needs to be inserted into the pile hole with its two ends tilted up and down respectively.

[0049] P2. After the clamping member 101 reaches the designated position, the vertical steel bar 102 at one end is pressed down and the vertical steel bar 102 at the other end is pulled up. The pressure block 103 on the pressed vertical steel bar 102 causes the upward tilting end of the clamping member 101 to move down, and the pull-out seat 104 on the pulled vertical steel bar 102 causes the downward tilting end of the clamping member 101 to move up. During the process of being flattened, the clamping member 101 achieves the purpose of clamping both ends of its clamping member to the hole wall of the pile inner hole, thereby preventing the vertical steel bar 102 from being pulled out or weakening the pull-out resistance due to concrete shrinkage and smooth hole wall.

[0050] Preferably, in this embodiment, when multiple anti-pull-out devices 1 are placed in the same broken pile section, the distance between two adjacent upper and lower clamping members 101 is about 1 meter.

[0051] The above solution is applicable to situations where hollow pipe piles with tensile strength break, and it can also be applied to the treatment of broken load-bearing piles, resulting in good overall economic benefits.

[0052] The above embodiments are only used to explain the concept of the present invention, and are not intended to limit the protection of the present invention. Any non-substantial modifications made to the present invention using this concept should fall within the protection scope of the present invention.

Claims

1. A process for treating broken tension piles, characterized in that, The device includes an anti-pull-out device, which includes a strip-shaped clamping member. Two vertical through holes are opened at both ends of the clamping member along its length direction. A steel bar passes through the through holes. A pressure block is provided at the upper end of the steel bar and an anti-pull-out seat is provided at the lower end of the through hole. The size of the pressure block and the anti-pull-out seat is larger than the diameter of the through hole. The pile body is broken into several sections along its length. The process for treating broken piles includes the following steps: S1. Determine the location of the broken pile; S2. Clean the inside of the pile hole; S3. Following the bottom-up sequence, each section of broken pile is first filled with concrete and then the pull-out device is placed in the construction operation; the length of the clamping member of the pull-out device is greater than the diameter of the pile hole, so that its two ends are clamped to the hole wall of the pile hole, and all clamping members are staggered, and the length of the steel bar of the pull-out device protrudes upwards from the top of the pile body. S4. After the pull-out device is placed in the topmost broken pile, concrete is poured in until the pile hole is filled. The process of inserting the pull-out device into the broken pile includes the following steps: P1. Insert the clamping member into the pile hole with its two ends tilted, one up and one down respectively; P2. After the clamping member reaches the designated position, the reinforcing bar at one end is pressed down and the reinforcing bar at the other end is pulled up. The pressure block on the pressing reinforcing bar causes the upward tilting end of the clamping member to move down, and the pull-out seat on the upward tilting reinforcing bar causes the downward tilting end of the clamping member to move up. During the process of being flattened, the clamping member presses against the wall of the inner hole of the pile at both ends.

2. The process for treating broken anti-uplift piles as described in claim 1, characterized in that, When multiple pull-out devices are placed inside the same broken pile section, the distance between two adjacent top clamping parts is 1m.

3. The process for treating broken anti-uplift piles as described in claim 1, characterized in that, The concrete is a micro-expansion self-compacting concrete.

4. The process for treating broken anti-uplift piles as described in claim 1, characterized in that, If the broken pile is misaligned before cleaning the inner hole of the pile, the broken pile should be corrected first.

5. The process for treating broken anti-uplift piles as described in claim 1, characterized in that, Cleaning the inside of the pile includes the following steps: T1. Remove soil and mud from the borehole; T2. Clean the hole and drain the mud and water.

6. The process for treating broken anti-uplift piles as described in claim 1, characterized in that, The reinforcing bars are threaded steel bars.

7. The process for treating broken anti-uplift piles as described in claim 1, characterized in that, The surface of the clamping member is provided with raised and recessed textures.

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