Cast-in-place pile head pretreatment device

Abstract

The utility model discloses a cast-in-place pile head pretreatment device and relates to the field of pile head breaking. The cast-in-place pile head pretreatment device comprises a steel ring, stiffening stirrups, an annular steel pipe connected to the steel ring, at least one grouting pipe with the bottom connected with the annular steel pipe and a plurality of steel wire ropes. The steel ring is arranged on the outer side of each main reinforcement in a reinforcement cage in a cast-in-place pile in a lifting and sleeving mode. The stiffening stirrups sleeve the outer walls of the tops of the main reinforcements and are connected with the main reinforcements to support the steel ring, a plurality of grouting holes are formed in the annular steel pipe, the steel wire ropes are arranged in the circumferential direction of the steel ring at intervals, and the bottoms of the steel wire ropes are connected with the steel ring. According to the cast-in-place pile head pretreatment device, the steel ring connected with the annular steel pipe is lowered into the cast-in-place pile through the steel wire rope, and the steel ring is supported by the stiffening stirrups connected with the main reinforcements in the reinforcement cage in the cast-in-place pile; the grouting pipe is used for injecting low-concentration cement paste and water into the top of the cast-in-place pile to reduce the concrete strength of the top of the cast-in-place pile, so that the pile head of the cast-in-place pile is conveniently broken, the operation difficulty is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of pile head removal, and more specifically, to a pretreatment device for cast-in-place pile heads. Background Technology

[0002] Drilled cast-in-place piles are piles constructed by creating pile holes in the foundation soil through mechanical drilling, steel pipe extrusion, or manual excavation on the engineering site, and then placing a steel cage in the pile hole and pouring concrete into it.

[0003] The top of the bored pile needs to be over-grouted to form a pile head. After the pile body reaches the design strength, the over-grouted pile head is broken. However, because the threaded steel bars are tightly bonded to the concrete after the concrete reaches the design strength, and the concrete strength is high, it is difficult to break the pile head, resulting in low construction efficiency and affecting the construction period, thus failing to meet the needs of the project construction.

[0004] Therefore, a pretreatment device for the pile head of a bored pile is needed to treat the top of the pile in order to reduce the difficulty of breaking the pile head. Utility Model Content

[0005] The purpose of this application is to provide a pretreatment device for the pile head of cast-in-place piles, which can reduce the concrete strength at the top of the cast-in-place pile, thereby facilitating the breaking of the pile head, reducing the difficulty of operation and improving construction efficiency.

[0006] This application is implemented as follows:

[0007] This application provides a pretreatment device for the pile head of a cast-in-place pile, comprising:

[0008] The steel ring is raised and lowered and fitted onto the outside of each main reinforcement bar in the steel cage of the cast-in-place pile.

[0009] Stiffening stirrups are fitted onto the outer wall of the top of each main reinforcement bar and connect to each main reinforcement bar to support the steel ring.

[0010] A ring-shaped steel pipe is connected to a steel ring and has multiple grouting holes.

[0011] At least one grouting pipe, with its bottom connected to a ring-shaped steel pipe;

[0012] Multiple steel wire ropes are arranged at intervals along the circumference of the steel ring and are connected to the steel ring at the bottom.

[0013] In some alternative implementations, multiple first sealing sleeves are also provided above the stiffening stirrups, each first sealing sleeve being fitted onto a main reinforcing bar, and a sealant layer is filled between the inner wall of the first sealing sleeve and the outer wall of the main reinforcing bar.

[0014] In some alternative implementations, multiple second sealing sleeves are also provided below the stiffening stirrups, each second sealing sleeve being fitted onto a main reinforcing bar, and a sealant layer is filled between the inner wall of the second sealing sleeve and the outer wall of the main reinforcing bar.

[0015] In some alternative implementations, multiple reinforcing bars are connected between the steel ring and the annular steel pipe.

[0016] In some alternative embodiments, the inner and / or outer walls of the annular steel pipe are provided with a row of grouting holes arranged at intervals along its circumference.

[0017] In some alternative implementations, the top or bottom wall of the annular steel pipe is provided with a row of grouting holes arranged at intervals along its circumference.

[0018] In some alternative implementations, the bottom of the steel ring is provided with a slot for engaging the stiffening stirrup.

[0019] In some alternative implementations, a fixed pulley and a winch corresponding to each wire rope are also included, with the wire rope wound around the corresponding fixed pulley and then connected to the winch.

[0020] In some alternative implementations, the width of the lower part of the steel ring gradually decreases from top to bottom.

[0021] The beneficial effects of this application are as follows: The pretreatment device for the pile head of the cast-in-place pile provided by this application includes a steel ring, stiffening stirrups, an annular steel pipe connected to the steel ring, at least one grouting pipe with its bottom connected to the annular steel pipe, and multiple steel wire ropes. The steel ring is movably fitted around the outside of each main reinforcement bar in the reinforcing cage of the cast-in-place pile; the stiffening stirrups are fitted around the top outer wall of each main reinforcement bar and connected to each main reinforcement bar to support the steel ring; the annular steel pipe has multiple grouting holes; and multiple steel wire ropes are arranged at intervals along the circumference of the steel ring and are respectively connected to the steel ring at their bottoms. The pretreatment device for the pile head of the cast-in-place pile provided by this application lowers the steel ring connected to the steel wire ropes and the annular steel pipe simultaneously when lowering the reinforcing cage, and uses the stiffening stirrups connected to each main reinforcement bar in the reinforcing cage of the cast-in-place pile to support the steel ring. Low-concentration cement slurry and water are injected into the top of the cast-in-place pile through the grouting pipe to reduce the concrete strength at the top of the cast-in-place pile, thereby facilitating the breaking of the pile head, reducing the difficulty of operation, and improving construction efficiency. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1This is a partial cross-sectional view of the pre-treatment device for the pile head of the cast-in-place pile provided in Embodiment 1 of this application, installed on each main reinforcement bar in the steel cage of the cast-in-place pile.

[0024] Figure 2 This is a schematic diagram of the pre-treatment device for the pile head of the cast-in-place pile provided in Embodiment 1 of this application, installed on each main reinforcement bar in the steel cage of the cast-in-place pile.

[0025] Figure 3 This is a partial cross-sectional view of the pre-treatment device for the pile head of the cast-in-place pile provided in Embodiment 2 of this application, installed on each main reinforcement bar in the steel cage of the cast-in-place pile.

[0026] Figure 4 This is a schematic diagram of the structure of the pretreatment device for the pile head of the cast-in-place pile provided in Embodiment 2 of this application, installed on each main reinforcement bar in the steel cage of the cast-in-place pile.

[0027] In the diagram: 100, steel ring; 110, reinforcing stirrup; 120, annular steel pipe; 121, grouting hole; 130, grouting pipe; 140, wire rope; 150, first sealing sleeve; 160, sealant layer; 170, second sealing sleeve; 180, reinforcing steel bar; 190, slot; 200, main reinforcement; 210, fixed pulley; 220, winch. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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 can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The features and performance of the pretreatment device for the pile head of the cast-in-place pile of this application will be further described in detail below with reference to the embodiments.

[0036] Example 1

[0037] like Figure 1 and Figure 2As shown in the figure, this application provides a pretreatment device for the pile head of a cast-in-place pile, which is used to pretreatment the top of the cast-in-place pile. A reinforcing cage is embedded in the cast-in-place pile, and the reinforcing cage includes eight main reinforcing bars 200 extending along the height direction. The pretreatment device for the pile head of the cast-in-place pile includes a steel ring 100, a stiffening stirrup 110, a ring steel pipe 120, two grouting pipes 130 and four steel wire ropes 140.

[0038] The steel ring 100 is movably fitted around the outside of the eight main reinforcing bars 200. The stiffening stirrups 110 are fitted around the eight main reinforcing bars 200 and welded to each main reinforcing bar 200 to support the steel ring 100. The annular steel pipe 120 is coaxially connected to the top surface of the steel ring 100. The top of the annular steel pipe 120 has eight grouting holes 121 spaced apart along its circumference. The inner and outer walls of the annular steel pipe 120 each have eight grouting holes 121 spaced apart along its circumference. Two grouting pipes 130 are symmetrically arranged and their bottoms are respectively connected to the top of the annular steel pipe 120. Four steel wire ropes 140 are spaced apart along the circumference of the steel ring 100 and their bottoms are respectively connected to the steel ring 100. The width of the lower part of the steel ring 100 gradually decreases from top to bottom. The width of the steel ring 100 refers to the difference between its outer diameter and inner diameter.

[0039] Eight first sealing sleeves 150 and eight second sealing sleeves 170 are respectively provided above and below the stiffening stirrup 110. Each first sealing sleeve 150 is fitted onto a main reinforcing bar 200. The inner top wall of the first sealing sleeve 150 and the outer wall of the main reinforcing bar 200 are filled with a sealant layer 160. Each second sealing sleeve 170 is fitted onto a main reinforcing bar 200. The inner bottom wall of the second sealing sleeve 170 and the outer wall of the main reinforcing bar 200 are filled with a sealant layer 160.

[0040] When using the pre-treatment device for the pile head of the cast-in-place pile provided in this application embodiment, firstly, each second sealing sleeve 170 is fitted below the pre-set stiffening stirrups 110 at the top of each main reinforcement 200 in the steel cage installed inside the cast-in-place pile. The stiffening stirrups 110 are fitted on the outside of each main reinforcement 200 and welded in place. Then, each first sealing sleeve 150 is fitted above the stiffening stirrups 110 at the top of each main reinforcement 200. Adhesive is then inserted between the inner wall of the top of the first sealing sleeve 150 and the outer wall of the main reinforcement 200, and between the inner wall of the bottom of the second sealing sleeve 170 and the outer wall of the main reinforcement 200, forming an adhesive sealing layer 160. Subsequently, four steel wire ropes 140 are used to lift the steel ring 100, which is connected to the top of the annular steel pipe 120, and fitted it onto the eight main reinforcements. The outer side of the reinforcing bar 200 descends to be supported on the stiffening stirrup 110. The top of the annular steel pipe 120 is connected to symmetrically arranged grouting pipes 130. At this time, the concrete pouring operation of the cast-in-place pile can be carried out. After the concrete pouring of the cast-in-place pile is completed for 4-5 hours, the cement grout is introduced into the annular steel pipe 120 through the grouting pipe 130 and then into the cast-in-place pile through the grouting hole 121. The grouting pressure is 2~3Mpa, the grouting time lasts for 10 minutes, and the mass ratio of cement to water in the cement grout is 1:0.5. After the grouting is completed, the steel wire rope 140 is slowly pulled upward to lift the steel ring 100. The pulling speed is controlled at about 5cm / min. At the same time as pulling, water is introduced into the annular steel pipe 120 through the grouting pipe 130 and then into the cast-in-place pile through the grouting hole 121.

[0041] The width of the lower part of the steel ring 100 gradually decreases from top to bottom, which allows the conical structure of the lower part of the steel ring 100 to facilitate the smooth rise of the bottom laitance to the surface layer during the concrete pouring process, thus ensuring the quality of the concrete pouring.

[0042] The beneficial effects of the pretreatment device for the pile head of the cast-in-place pile provided in this application are:

[0043] First, the structure is simple, reliable and reusable. When pre-treating the cast-in-place pile, the steel wire rope 140 is used to lower the steel ring 100 and the annular steel pipe 120 onto the main reinforcement 200 of the reinforcing cage and the stiffening stirrup 110. After grouting is completed, they are pulled out. The construction time is short and efficient turnover can be achieved.

[0044] 2. The steel ring 100, which is fitted onto the main reinforcement 200 of the steel cage, can control the protective layer of the cast-in-place pile, limit the lateral movement of the steel cage, and improve stability during concrete pouring and grouting.

[0045] Third, by installing a first sealing sleeve 150 and a second sealing sleeve 170 on the main reinforcement 200 above and below the stiffening stirrup 110 respectively, the problem of tight connection between the main reinforcement 200 and the concrete is solved, reducing the difficulty of pile head removal. At the same time, the sealant layer 160 between the first sealing sleeve 150 and the main reinforcement 200, and between the inner wall of the second sealing sleeve 170 and the outer wall of the main reinforcement 200, can prevent concrete from entering and facilitate subsequent removal.

[0046] 4. After the concrete of the cast-in-place pile is poured, cement grout is introduced into the annular steel pipe 120 through the grouting pipe 130 and then into the cast-in-place pile through the grouting hole 121. This ensures the quality of the pile head while diluting the concrete. At the same time as lifting the steel ring 100 and the annular steel pipe 120, pure water is injected to cause the concrete above the reinforcing stirrup 110 to segregate and reduce the concrete strength, which greatly reduces the difficulty of removing the concrete at the top of the pile later and effectively improves the work efficiency.

[0047] In other alternative embodiments, the number of grouting pipes 130 may be one, three, four or more.

[0048] In other alternative embodiments, the number of wire ropes 140 may also be two, three, four or more.

[0049] In other alternative embodiments, the number and position of the grouting holes 121 on the annular steel pipe 120 can be adjusted as needed.

[0050] Example 2

[0051] like Figure 3 and Figure 4 As shown, this application embodiment provides a pretreatment device for the pile head of a cast-in-place pile, which has a structure that is roughly the same as the pretreatment device for the pile head of a cast-in-place pile provided in Embodiment 1. The difference is that, in this embodiment, the pretreatment device for the pile head of a cast-in-place pile also includes a fixed pulley 210 and a winch 220 corresponding to each of the steel wire ropes 140. Each steel wire rope 140 is wound around a corresponding fixed pulley 210 and then connected to the corresponding winch 220. Eight reinforcing bars 180 are arranged at intervals along the circumference of the steel ring 100 between the steel ring 100 and the annular steel pipe 120. The bottom of the steel ring 100 is provided with an annular groove 190 for engaging the stiffening stirrups 110.

[0052] The pretreatment device for the pile head of the cast-in-place pile provided in this embodiment uses a winch 220 and a fixed pulley 210 to pull the steel wire rope 140 to drive the steel ring 100 and the annular steel pipe 120 to rise and fall stably. This ensures stable pretreatment of the pile head to reduce the structural strength of the pile head and facilitate subsequent demolition operations. Eight reinforcing steel bars 180 are arranged at intervals along the circumference of the steel ring 100 between the steel ring 100 and the annular steel pipe 120. The reinforcing steel bars 180 can be used to improve the strength of the steel ring 100 and the annular steel pipe 120. The tight connection between the steel pipes 120 ensures the stability of the grouting process. The bottom of the steel ring 100 is provided with an annular groove 190 for engaging the stiffening stirrup 110. When the steel wire rope 140 is used to lower the steel ring 100 and the annular steel pipe 120 to the stiffening stirrup 110 for support, the groove 190 at the bottom of the steel ring 100 engages with the stiffening stirrup 110, ensuring a stable connection between the steel ring 100 and the stiffening stirrup 110 for subsequent pretreatment operations.

[0053] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A pretreatment device for the pile head of a cast-in-place pile, characterized in that, It includes: The steel ring is raised and lowered and fitted onto the outside of each main reinforcement bar in the steel cage of the cast-in-place pile. Stiffening stirrups are fitted onto the top outer wall of each of the main reinforcing bars and connected to each of the main reinforcing bars to support the steel ring. A ring-shaped steel pipe is connected to the steel ring and has multiple grouting holes; At least one grouting pipe is connected at the bottom to the annular steel pipe; Multiple steel wire ropes are arranged at intervals along the circumference of the steel ring and are respectively connected to the bottom of the steel ring.

2. The pretreatment device for the pile head of a cast-in-place pile according to claim 1, characterized in that, It also includes multiple first sealing sleeves disposed above the stiffening stirrups, each of the first sealing sleeves being fitted onto one of the main reinforcing bars, and a sealant layer being filled between the inner wall of the first sealing sleeve and the outer wall of the main reinforcing bar.

3. The pretreatment device for the pile head of a cast-in-place pile according to claim 1, characterized in that, It also includes multiple second sealing sleeves located below the stiffening stirrups, each of which is fitted onto one of the main reinforcing bars, and the space between the inner wall of the second sealing sleeve and the outer wall of the main reinforcing bar is filled with a sealant layer.

4. The pretreatment device for the pile head of a cast-in-place pile according to claim 1, characterized in that, Multiple reinforcing bars are connected between the steel ring and the annular steel pipe.

5. The pretreatment device for the pile head of a cast-in-place pile according to claim 1, characterized in that, The inner and / or outer walls of the annular steel pipe are provided with a row of grouting holes arranged at intervals along its circumference.

6. The pretreatment device for the pile head of a cast-in-place pile according to claim 1, characterized in that, The annular steel pipe has a row of grouting holes arranged at intervals along its circumference on its top or bottom wall.

7. The pretreatment device for the pile head of a cast-in-place pile according to claim 1, characterized in that, The bottom of the steel ring is provided with a slot for engaging the stiffening stirrup.

8. The pretreatment device for the pile head of a cast-in-place pile according to claim 1, characterized in that, It also includes fixed pulleys and winches corresponding to each of the steel wire ropes, with the steel wire ropes wound around the corresponding fixed pulleys and then connected to the winches.

9. The pretreatment device for the pile head of a cast-in-place pile according to claim 1, characterized in that, The width of the lower part of the steel ring gradually decreases from top to bottom.

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