Grouting structure for post-grouting of pile end of prestressed concrete hollow pile

Abstract

The utility model belongs to the technical field of prestressed concrete construction, and particularly relates to a grouting structure for post-grouting of a prestressed concrete hollow pile end, which comprises a pile cylinder and a pile head, an inserting groove connected with a grouting pipe is arranged at the bottom of the pile cylinder, an inserting head matched with the inserting groove is arranged at the top of the pile head, and reinforcing plates are uniformly distributed on the outer side of the pile head. A slurry discharging pipe and a discharging cavity which are communicated with the grouting pipe are arranged in the pile head, a sealing cover is rotationally connected into the discharging cavity, the sealing cover is clamped into a mounting groove of the discharging cavity through a positioning head, an extrusion cavity is formed below the sealing cover, and a first limiting groove in the bottom of the pile barrel and a second limiting groove in the top of the pile head are clamped and fixed through a connecting column; through the reasonable structural design, efficient butt joint of the grouting pipe and the slurry discharging pipe is achieved, the sealing cover of the discharging cavity can be automatically opened during grouting, blockage of the slurry discharging pipe is avoided, and meanwhile the strength of the pile head is improved through the arrangement of the reinforcing plate.

Description

TECHNICAL FIELD

[0001] The utility model belongs to prestressed concrete construction technical field, concretely relates to a grouting structure for prestressed concrete hollow pile pile end post grouting. BACKGROUND

[0002] Prestressed concrete hollow pile is widely used in building engineering and foundation construction due to its good bearing performance and economy. In order to improve the bearing capacity and durability of hollow pile, pile end grouting technology is usually used after pile body construction is completed, and slurry is injected at the pile end to fill the void at the pile end and improve the surrounding soil properties, thereby enhancing the bonding force of the pile body and the foundation. However, the existing pile end grouting technology still has some deficiencies in practical application.

[0003] The current grouting equipment mainly uses a single pipeline for slurry transportation. During the process of slurry passing through the slurry discharge pipe into the soil, the slurry discharge pipe is often blocked by soil particles, resulting in uneven or failed grouting. At the same time, the sealing performance during grouting is difficult to effectively guarantee, and the slurry may flow back along the pipe wall when the grouting pressure increases, which reduces the grouting efficiency. In addition, the assembly method of the existing grouting structure is relatively complex, and it is difficult to achieve rapid installation and reliable connection. Especially in high-strength prestressed pile construction, the connection part is prone to failure due to stress concentration, which affects the overall performance of the pile body. SUMMARY

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a grouting structure for prestressed concrete hollow pile pile end post grouting, which can avoid slurry discharge pipe blockage, improve grouting sealing performance and efficiency, and has a reliable structure and is easy to install.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A grouting structure for prestressed concrete hollow pile pile end post grouting, comprising a pile barrel and a pile head connected to the bottom of the pile barrel, a grouting pipe is inserted through the pile barrel, and the grouting pipe is distributed at equal intervals around the axis of the pile barrel;

[0007] The shape of the pile head is set as an inverted cone, and a slurry discharge pipe is provided through the pile head, corresponding to the grouting pipe;

[0008] A discharge cavity corresponding to the slurry discharge pipe is provided on the outside of the pile head;

[0009] The discharge cavity is located at the bottom end of the slurry discharge pipe, and the discharge cavity and the slurry discharge pipe are mutually penetrated;

[0010] A sealing cover is rotatably connected in the discharge cavity.

[0011] Further, a plug-in slot is provided at the bottom of the grouting pipe.

[0012] The top of the slurry discharge pipe is fixedly connected with a plug connector;

[0013] When the pile head is connected with the pile barrel, the plug connector is inserted into the plug slot.

[0014] Further, the inside of the discharge cavity is provided with mounting slots on both sides, which are arc-shaped.

[0015] Both sides of the sealing cover are fixedly connected with positioning heads.

[0016] When the sealing cover is installed in the discharge cavity, the positioning heads are clamped into the mounting slots.

[0017] Further, the side surface of the sealing cover is provided with an extrusion cavity, which is located directly below the bottom of the slurry discharge pipe.

[0018] Further, the outer side surface of the pile head is fixedly connected with reinforcing plates, which are distributed at equal intervals around the central axis of the pile head.

[0019] Further, the bottom outer side of the pile barrel is provided with first limiting slots at equal intervals around the central axis;

[0020] The top outer side of the pile head is provided with second limiting slots at equal intervals around the central axis, which correspond to the first limiting slots;

[0021] The first limiting slots and the second limiting slots are clamped with connecting columns.

[0022] Compared with the prior art, the utility model has the beneficial effects that:

[0023] By arranging the grouting pipe at the bottom of the pile barrel, the grouting pipe is distributed at equal intervals around the central axis of the pile barrel and corresponds to the slurry discharge pipe, so that the slurry can be uniformly distributed in all directions of the pile head, the problem of uneven distribution of the slurry in the prior art is avoided, the grouting efficiency is improved, and the bonding force between the pile body and the foundation is enhanced.

[0024] The pile head is arranged in an inverted conical shape, and the reinforcing plates are uniformly distributed on the outer side surface of the pile head, so that the holding effect of the reinforcing plates improves the overall strength of the pile head, especially when the foundation reaction force is borne, the deformation and rupture of the pile head can be effectively prevented, and the problem that the pile head structure is easily damaged in the prior art is solved.

[0025] The sealing cover is embedded into the mounting slot through the positioning head and is rotatably connected in the discharge cavity. The design of the sealing cover avoids the problem that the soil particles enter the slurry discharge pipe and cause blockage, and the outlet of the discharge cavity can be automatically opened when the slurry is injected, so as to realize the automatic switching function of sealing and opening and ensure the smooth progress of the grouting process.

[0026] The plug-in connector is arranged at the top of the slurry discharge pipe, and is matched with the plug-in slot at the bottom of the grouting pipe, so that the connection of the pile cylinder and the pile head is more convenient and firm.

[0027] The first limiting slot at the bottom of the pile cylinder is matched with the second limiting slot at the top of the pile head, and the stable connection of the pile head and the pile cylinder is realized by the connecting column. The connecting column not only enhances the bonding force between the pile cylinder and the pile head, but also avoids the loosening and separation phenomenon that may occur in the high-pressure grouting process.

[0028] The bottom end of the slurry discharge pipe is provided with an extrusion cavity, which can buffer the slurry flow and guide the slurry to be uniformly distributed into the discharge cavity, so as to avoid the impact of the slurry on the sealing cover due to pressure fluctuation, and improve the service life of the sealing cover and the stability of the grouting process. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a structural schematic view of the utility model;

[0030] Figure 2 It is a structural schematic view of the pile cylinder of the utility model;

[0031] Figure 3 It is a structural schematic view of the pile head of the utility model Figure 1 ;

[0032] Figure 4 It is a structural schematic view of the pile head of the utility model Figure 2 ;

[0033] Figure 5 It is a sectional view of the pile head of the utility model;

[0034] Figure 6 It is a structural schematic view of the sealing cover of the utility model.

[0035] In the drawings, the component list represented by each sign is as follows:

[0036] 1, pile cylinder;11, grouting pipe;111, plug-in slot;12, first limiting slot;

[0037] 2, pile head;21, slurry discharge pipe;211, plug-in connector;22, second limiting slot;23, reinforcing plate;24, discharge cavity;241, mounting slot;

[0038] 3, sealing cover;31, positioning head;32, extrusion cavity;4, connecting column. DETAILED DESCRIPTION

[0039] In order to make the purpose and advantages of the utility model more clearly, the following will make a specific description of the utility model with examples.

[0040] Referring to Figures 1-6 A grouting structure for prestressed concrete hollow pile end post grouting, including pile barrel 1 and the pile head 2 that are connected at the bottom of pile barrel 1, the grouting pipe 11 is inserted through on pile barrel 1, and the grouting pipe 11 is distributed at equal intervals around the axis of pile barrel 1;The top of grouting pipe 11 is fixed on the inner wall of pile barrel 1 by welding to ensure that grouting pipe 11 will not fall off or deviate when bearing high-pressure grouting;The internal passage of grouting pipe 11 is smooth to reduce the resistance when transporting slurry.

[0041] The shape of pile head 2 is set as an inverted cone, and a slurry discharge pipe 21 is provided through on pile head 2, and the slurry discharge pipe 21 corresponds to the grouting pipe 11;The internal diameter of slurry discharge pipe 21 is set to be slightly larger than the outlet diameter of grouting pipe 11 to ensure that the slurry can flow smoothly;The outer wall of slurry discharge pipe 21 is thickened to enhance its compression resistance and meet the delivery requirements of high-pressure slurry.

[0042] A discharge cavity 24 corresponding to the slurry discharge pipe 21 is provided on the outside of the pile head 2;The discharge cavity 24 is cylindrical in shape, and the discharge cavity 24 is located at the bottom end of the slurry discharge pipe 21, and the discharge cavity 24 and the slurry discharge pipe 21 are mutually penetrated;The inner wall of discharge cavity 24 is precisely machined to ensure a tight fit with the contact surface of sealing cover 3, thereby improving the sealing performance;The sealing cover 3 is rotatably connected in the discharge cavity 24, and the sealing cover 3 is fixed in the discharge cavity 24 by a rotating shaft and can be freely opened and closed under the action of grouting pressure.

[0043] Referring to Figures 2-3 A plug-in slot 111 is provided at the bottom of grouting pipe 11, and the depth and width of plug-in slot 111 match the size of plug-in head 211;The top of slurry discharge pipe 21 is fixedly connected with plug-in head 211, and plug-in head 211 is designed in one piece to enhance the strength of the connection;When the pile head 2 is connected with the pile barrel 1, the plug-in head 211 is inserted into the plug-in slot 111, and the plug-in part is further fixed by welding to form a high-strength integral connection.

[0044] Referring to Figures 5-6Both sides of the interior of the discharging cavity 24 are provided with mounting grooves 241, the shape of the mounting grooves 241 is arc-shaped, and the depth of the mounting grooves 241 matches the positioning head 31 of the sealing cover 3; both sides of the sealing cover 3 are fixedly connected with the positioning head 31, the positioning head 31 is embedded in the mounting groove 241 to realize stable installation of the sealing cover 3; when the sealing cover 3 is installed in the discharging cavity 24, the positioning head 31 is clamped into the mounting groove 241, and after installation, the sealing cover 3 can be prevented from falling off under the impact of soil.

[0045] Referring to Figure 2 and Figure 6 , the side surface of the sealing cover 3 is provided with an extrusion cavity 32, and the extrusion cavity 32 is located directly below the bottom of the slurry discharge pipe 21; the inner wall of the extrusion cavity 32 is arc-shaped, which can guide the slurry to flow uniformly into the discharging cavity 24, and at the same time, through the expansion effect of the extrusion cavity 32, the slurry can buffer and reduce the direct impact on the sealing cover 3, thereby prolonging the service life of the sealing cover 3.

[0046] Referring to Figure 4 , the outer side of the pile head 2 is fixedly connected with a reinforcing plate 23, the reinforcing plate 23 is distributed at equal intervals around the central axis of the pile head 2, and the thickness of the reinforcing plate 23 is designed according to engineering requirements to improve the anti-deformation ability of the pile head 2; the reinforcing plate 23 is connected with the outer side of the pile head 2 by welding, and a gap is left between the reinforcing plate 23 and the slurry discharge pipe 21, so that the slurry can flow out without being blocked.

[0047] Referring to Figures 1-3 , the bottom outer side of the pile barrel 1 is provided with first limiting grooves 12 at equal intervals around the central axis; the top outer side of the pile head 2 is provided with second limiting grooves 22 corresponding to the first limiting grooves 12 at equal intervals around the central axis; the first limiting grooves 12 and the second limiting grooves 22 are clamped with a connecting column 4, and the two ends of the connecting column 4 are fixed with the limiting grooves through clamping devices to ensure stable connection between the pile head 2 and the pile barrel 1; the material of the connecting column 4 is selected from high-strength alloy steel and is subjected to corrosion prevention treatment to improve its tensile strength and durability.

[0048] The working principle of the utility model is as follows:

[0049] In use, the pile head 2 is connected to the bottom of the pile barrel 1, when connecting the pile head 2 and the pile barrel 1, the plug-in head 211 is inserted into the plug-in groove 111, then the connecting column 4 is clamped into the second limiting groove 22 and the first limiting groove 12, and then the pile barrel 1, the pile head 2 and the connecting column 4 are welded together using a welding gun; under the clamping of the connecting column 4, the connection strength between the pile head 2 and the pile barrel 1 can be increased.

[0050] Then the sealing cover 3 is installed in the discharging cavity 24, when installing the sealing cover 3, the positioning head 31 is clamped into the mounting groove 241, and the positioning head 31 is clamped into the bottom end of the mounting groove 241;

[0051] Then the sealing cover 3 is buckled into the connecting column 4;

[0052] In this way, when the pile head 2 extends into the soil, the sealing cover 3 can avoid the soil from blocking the discharge pipe 21;

[0053] When the pile head 2 is inserted to the predetermined depth, the grout is injected into the discharge pipe 21 through the grouting pipe 11 and flows into the extrusion cavity 32 through the discharge pipe 21, and with the increase of the grouting pressure, the sealing cover 3 is pushed away from the discharge cavity 24, the grout flows out from the opening between the sealing cover 3 and the discharge cavity 24, and then the grouting operation is completed.

[0054] The above only is the preferred embodiment of the present application, it should be pointed out that, for the ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application. The structure, device and operation method not specifically described and explained in the present application, if no special description and limitation, are implemented according to the conventional means in the art.

Claims

1. A grouting structure for post-grouting of a prestressed concrete hollow pile end, comprising a pile tube (1) and a pile head (2) connected to the bottom of the pile tube (1), characterized in that: The pile barrel (1) is provided with a grouting pipe (11) penetratingly inserted thereinto, and the grouting pipe (11) is distributed at equal intervals around the axis of the pile barrel (1); The pile head (2) is provided in a reverse conical shape, and the pile head (2) is provided with a discharge pipe (21) penetratingly arranged thereon, and the discharge pipe (21) corresponds to the grouting pipe (11); The outer side of the pile head (2) is provided with a discharge cavity (24) corresponding to the discharge pipe (21); The discharge cavity (24) is located at the bottom end of the discharge pipe (21), and the discharge cavity (24) and the discharge pipe (21) are mutually penetrated; The discharge cavity (24) is rotatably connected with a sealing cover (3).

2. The grouting structure for post-grouting of prestressed concrete hollow pile end according to claim 1, characterized in that: The bottom of the grouting pipe (11) is provided with an insertion slot (111); The top of the discharge pipe (21) is fixedly connected with an insertion head (211); When the pile head (2) is connected with the pile barrel (1), the insertion head (211) is inserted into the insertion slot (111).

3. The grouting structure for post-grouting of prestressed concrete hollow pile end according to claim 1, characterized in that: The inner sides of the discharge cavity (24) are both provided with an installation slot (241), and the installation slot (241) is provided in an arc shape; The sealing cover (3) is provided with a positioning head (31) fixedly connected to the two sides thereof; When the sealing cover (3) is installed in the discharge cavity (24), the positioning head (31) is clamped into the installation slot (241).

4. The grouting structure for post-grouting of prestressed concrete hollow pile end according to claim 3, characterized in that: The side of the sealing cover (3) is provided with an extrusion cavity (32), and the extrusion cavity (32) is located directly below the bottom of the discharge pipe (21).

5. The grouting structure for post-grouting of prestressed concrete hollow pile end according to claim 1, characterized in that: The outer side of the pile head (2) is fixedly connected with a reinforcing plate (23), and the reinforcing plate (23) is distributed at equal intervals around the central axis of the pile head (2).

6. The grouting structure for post-grouting of prestressed concrete hollow pile end according to claim 1, characterized in that: The bottom outer side of the pile barrel (1) is provided with a first limiting slot (12) at equal intervals around the central axis; The top outer side of the pile head (2) is provided with a second limiting slot (22) at equal intervals around the central axis, and the second limiting slot (22) corresponds to the first limiting slot (12); The first limiting slot (12) and the second limiting slot (22) are both provided with a connecting column (4).

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