Cast-in-place pile protection device for long auger drilling and concrete pressure pouring rear insertion reinforcement cage

Abstract

The utility model discloses a cast-in-place pile protection device used for a long auger drilling pressure grouting concrete rear-inserted reinforcement cage, which comprises a pile casing and an annular cushion block, the upper end of the pile casing is welded with a pair of lifting lugs, the pile casing is lifted in a pile hole of a cast-in-place pile through the lifting lugs, the upper end of the pile casing is a funnel-shaped flaring type feed opening, and the lower end of the pile casing is connected with the annular cushion block. The diameter of the flaring type discharging opening is larger than that of a pile hole, the annular cushion block is arranged on a reinforcement cage to be inserted in a sleeving mode, and the outer diameter of the annular cushion block is equal to that of the lower portion of the pile casing. Compared with the prior art, the problems that the bottom of the reinforcement cage possibly scrapes a pile wall and a pile hole opening and brings in silt in the swinging process are solved, in the lowering process of the reinforcement cage, swinging of the reinforcement cage can be reduced by being matched with a pile casing, centering of the reinforcement cage in the lowering process is ensured, and the construction efficiency is improved. The pile forming quality can be remarkably improved, the working efficiency is greatly improved, the excavation work amount of soil between piles is saved, the construction period is shortened, labor is saved, and the labor intensity of workers is reduced.

Description

Technical Field

[0001] This utility model relates to the field of construction engineering, and in particular to a protective device for cast-in-place piles after the insertion of reinforcing cages in long spiral drilling and pressure grouting concrete. Background Technology

[0002] Long spiral drilling and pressure grouting piles improve the original stratum properties, increase foundation strength and friction, and the construction method is not limited by the groundwater level, making it highly cost-effective.

[0003] According to Section 5.7.4 of the "Technical Standard for Long Spiral Drilled Piles" (JGJ T419-2018), the installation of the reinforcing cage should comply with the following provisions: 1. After the concrete is poured to the design elevation and the excavated soil around the pile hole is cleared, the reinforcing cage should be immediately aligned with the center of the pile hole for installation; Section 5.7.6 states that during the installation process, the center of the reinforcing cage should always be aligned with the center of the borehole, and the verticality of the reinforcing cage should be strictly controlled. The above specifications do not specify concrete measures for controlling the verticality of the reinforcing cage, which leads to a lack of corresponding measures being taken to control this crucial task of post-installation of the reinforcing cage during actual construction.

[0004] In actual construction, the rebar cage inserted after being inserted for about one meter begins to sway violently from side to side. During the swaying process, the cage descends and carries a large amount of mud and sand into the pile body from the borehole. At the same time, the bottom of the cage also scrapes against the borehole wall, carrying mud and sand into the pile body, which poses a quality hazard. The verticality of the rebar cage insertion and the control of the protective layer thickness have never been guaranteed.

[0005] Therefore, there is an urgent need to develop and design a device for a protective cylinder for the reinforcing cage after it is inserted into the pile foundation for long spiral drilling and pressure grouting. Utility Model Content

[0006] This utility model provides a protective device for cast-in-place piles after the insertion of reinforcing cages in long spiral drilling and pressure grouting, which solves the above-mentioned problems.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a protective device for cast-in-place piles after long spiral drilling and pressure grouting of concrete and insertion of reinforcing cages, comprising a casing and an annular pad. The upper end of the casing is welded with a pair of lifting lugs, and the casing is suspended in the pile hole of the cast-in-place pile through the lifting lugs. The upper end of the casing has a funnel-shaped flared discharge port, and the diameter of the flared discharge port is larger than the diameter of the pile hole. The annular pad is fitted onto the reinforcing cage to be inserted, and the outer diameter of the annular pad is the same as the lower part of the casing.

[0008] Preferably, the outer wall of the upper end of the casing is provided with a level mounting bracket, and a level tube is horizontally installed on the level mounting bracket.

[0009] Preferably, the level mounting bracket is made of angle steel and consists of a vertical part and a horizontal part. The vertical part of the level mounting bracket is welded to the outer wall of the protective sleeve, and the level tube is horizontally fixed to the horizontal part of the level mounting bracket.

[0010] Preferably, there are multiple annular pads, which are evenly arranged along the length of the reinforcing cage and welded to the reinforcing cage.

[0011] Preferably, the lifting lug is made of 2C28 steel bar bent into shape, and both ends of the lifting lug are fully welded to the protective casing.

[0012] Compared with the prior art, the advantages of this utility model are:

[0013] (1) The present invention utilizes the flared discharge port to play a positioning and guiding role, which makes it easy to align the steel cage with the pile hole and lower it. At the same time, the front section of the pile hole and the pile hole opening are protected by a protective sleeve, which solves the problem that the bottom of the steel cage may scrape the pile wall and the pile hole opening during the swinging process, bringing in mud and sand, effectively improving the quality of the pile and reducing pile defects.

[0014] (2) This utility model is designed with an annular pad for use with the casing. The annular pad is welded to the steel cage. During the lowering of the steel cage, it can reduce the swing of the steel cage by working with the casing, ensuring the centering of the steel cage during the lowering process, and ensuring that the thickness of the protective layer of the steel cage after pouring meets the specifications.

[0015] (2) This utility model can significantly improve the quality of pile formation, greatly improve work efficiency, save the amount of soil excavation between piles, speed up the construction period, save labor, and reduce the labor intensity of workers. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the steel reinforcement skeleton unit of this utility model.

[0017] In the diagram: 1. Casing; 2. Flared discharge port; 3. Level mounting bracket; 4. Level tube; 5. Lifting lug; 6. Annular pad. Detailed Implementation

[0018] The present invention will be further described below.

[0019] Example: A protective device for cast-in-place piles after the insertion of reinforcing cages in long spiral drilling and pressure grouting of concrete, see [link to example]. Figure 1The system includes a casing 1 and an annular pad 6. A pair of lifting lugs 5 are welded to the upper end of the casing 1, which is then suspended inside the pile hole of the cast-in-place pile. The upper end of the casing 1 has a funnel-shaped flared discharge port 2, the diameter of which is larger than the diameter of the pile hole. The annular pad 6 is fitted onto the reinforcing cage to be inserted, with its outer diameter matching the lower part of the casing 1. Through the structural design of the casing 1, the flared discharge port 2 serves as a positioning guide during the lowering of the reinforcing cage, facilitating alignment of the cage with the pile hole. Simultaneously, the casing 1 protects the front section and opening of the pile hole, preventing the bottom of the reinforcing cage from scraping against the pile wall and the pile hole opening during swaying, thus preventing the introduction of mud and sand. This effectively improves the quality of the pile and reduces pile defects.

[0020] After the long spiral drilled pile is drilled and the soil is exposed, a natural over-filling opening will be formed at the pile hole. After the casing 1 is placed, the flared discharge port 2 can be stuck on the over-filling opening to support the casing 1. Therefore, the foundation pit can be excavated to 20-30cm above the bottom of the cushion layer without reserving the over-filling soil layer, reducing the excavation work between piles, saving construction time, and saving machinery and labor.

[0021] Because the reinforcing cage is too long, even with the protection of the casing 1, there will still be a slight sway within the casing 1. To improve its centering, this invention designs an annular pad 6 to be used in conjunction with the casing 1. The annular pad 6 is welded to the reinforcing cage. During the lowering of the reinforcing cage, its cooperation with the casing 1 reduces the swaying of the reinforcing cage, ensuring centering during the lowering process and ensuring that the thickness of the protective layer of the reinforcing cage meets the specifications after pouring. Similarly, for cost considerations, if the annular pad 6 is not used, a ring of positioning steel bars can be welded around the existing reinforcing cage. The positioning steel bars cooperate with the casing 1 to achieve guiding and positioning of the reinforcing cage during the lowering process. As a preferred embodiment, there are multiple annular pads 6, evenly arranged along the length of the reinforcing cage and welded to it.

[0022] During the construction of cast-in-place piles with long spiral drilling and pressure grouting followed by reinforcement cage insertion, construction personnel are prohibited from approaching the pile hole. Currently, during the hoisting of the casing 1, it is only possible to visually observe whether the casing 1 is inserted vertically into the pile hole. If the casing 1 is inserted at an angle, it may cause soil erosion on the inner wall of the pile hole, affecting the lowering of the reinforcement cage and the quality of the pile. Therefore, this invention also provides a level mounting frame 3 on the upper outer wall of the casing 1. A level tube 4 is horizontally installed on the level mounting frame 3. During the hoisting of the casing 1, construction personnel can use the air bubble in the level tube 4 to determine whether the casing 1 is tilted during hoisting. By adjusting the hoisting, it is ensured that the casing 1 is inserted completely vertically into the pile hole and maintains a certain levelness after insertion.

[0023] The level mounting frame 3 is made of angle steel and consists of a vertical part and a horizontal part. The vertical part of the level mounting frame 3 is welded to the outer wall of the casing 1. The level tube 4 is horizontally fixed on the horizontal part of the level mounting frame 3. The horizontal part of the level mounting frame 3 is parallel to the horizontal plane and is used to install the level tube 4 so as to determine the overall verticality of the casing 1 during the hoisting process.

[0024] To ensure the safety and stability of the casing 1 during hoisting, the hoisting lug 5 is made of 2C28 steel bars and is fully welded to the casing 1 on both sides.

[0025] The construction process for cast-in-place piles with reinforcing cages inserted after long spiral drilling and pressure grouting is as follows:

[0026] Long spiral drilling: Long spiral drilling is carried out, and grouting is performed while the pipe is pulled out after drilling;

[0027] Measurement of pile center: After the plain concrete pile is formed by long spiral drilling and pressure grouting, the spiral drill bit is removed, and the pile center is measured using RTK.

[0028] Hoisting and pressing out casing 1: While ensuring the verticality of casing 1, hoist casing 1 and insert it into the pile hole;

[0029] Lifting of the reinforcing cage: Weld the annular pad 6 or positioning steel bars onto the reinforcing cage. First, insert the core tube with the eccentric vibration device into the reinforcing cage on the ground. After securing it with wire rope, use a crane to lift the reinforcing cage and vibration device to erect the dry pile. Before drilling, prepare for lifting. After the casing 1 is installed, press the reinforcing cage down.

[0030] Pressing down the reinforcing cage: Using a crane to lift the vibratory hammer, along with the core tube, place the reinforcing cage together at the plain concrete pile position. After it settles and stabilizes under its own weight, lower the reinforcing cage down along the casing 1 to maintain the verticality of the reinforcing cage until it is lowered into the plain concrete pile to the designed depth.

[0031] The above provides a detailed description of a protective device for cast-in-place piles after long spiral drilling and pressure grouting of concrete, using a reinforcing cage. Specific examples have been used to illustrate the principle and implementation of this utility model. The descriptions of the embodiments are merely for the purpose of helping to understand the method and core idea of ​​this utility model. Furthermore, those skilled in the art will recognize that, based on the concept of this utility model, there will be changes in the specific implementation methods and application scope. Modifications and improvements to this utility model are possible without exceeding the concept and scope defined in the appended claims. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A protective device for cast-in-place piles after the insertion of reinforcing cages in long spiral drilling and pressure grouting, characterized in that: The utility model relates to a pouring pile protection sleeve and ring-shaped cushion block, the upper end of the protection sleeve is welded with a pair of hoisting ears, the protection sleeve is hoisted in the pile hole of the pouring pile through the hoisting ear, the upper end of the protection sleeve is funnel-shaped flared discharge port, and the diameter of the flared discharge port is larger than the diameter of the pile hole, the ring-shaped cushion block is sleeved on the steel reinforcement cage to be inserted, and the outer diameter of the ring-shaped cushion block is the same as the lower part of the protection sleeve.

2. A cast-in-place pile protection device for a long spiral auger bored concrete filled post-inserted reinforcement cage according to claim 1, characterized in that: The outer wall of the upper end of the protection sleeve is provided with a level instrument mounting frame, and a level tube is horizontally mounted on the level instrument mounting frame.

3. A cast-in-place pile protection device for a long spiral auger bored concrete filled post-inserted reinforcement cage according to claim 2, characterized in that: The level instrument mounting frame is composed of a vertical part and a horizontal part, the vertical part of the level instrument mounting frame is welded on the outer lateral wall of the protection sleeve, and the level tube is horizontally fixed on the horizontal part of the level instrument mounting frame.

4. A cast-in-place pile protection device for a long spiral auger bored concrete filled post-inserted reinforcement cage according to claim 2, characterized in that: The ring-shaped cushion block is provided with a plurality of ring-shaped cushion blocks, which are uniformly arranged along the length direction of the steel reinforcement cage and welded on the steel reinforcement cage.

5. A cast-in-place pile protection device for a long spiral auger bored concrete filled post-inserted reinforcement cage according to claim 1, characterized in that: The hoisting ear is made of 2C28 steel reinforcement and is double-sided full-welded on the protection sleeve.

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