Pile foundation post-grouting pipeline joint

Abstract

The pile foundation post-grouting pipeline connector comprises a pile foundation pipeline of a three-way connector, a grouting pipeline is welded to a connector of the vertical end of the pile foundation pipeline, and grouting connecting pipes are assembled to connectors of the two sides of the horizontal end of the pile foundation pipeline; a fixing hoop is connected between the grouting connecting pipe and the pile foundation pipeline in a clamped mode, and fastening plates are installed on the two sides of an opening of the fixing hoop. A fastening screw hole is formed in the side wall of the fastening plate, and a bolt body is connected into the fastening screw hole in a threaded mode. A round groove is formed in the bottom end of the bolt body, a bolt rod is installed in the round groove, and a fastening nut is in threaded connection with the portion, located on the outer wall of the fastening plate, of the outer portion of the bolt rod. Due to the arrangement of the pile foundation post-grouting pipeline joint, the structural design is reasonable; the adopted T-shaped grouting structure can be fixed to a pile foundation reinforcement cage, it is guaranteed that the grouting range is stable, and a certain positioning effect is achieved; and the designed double grouting pipes are convenient and fast to connect, holes of the grouting pipes are effectively impacted, and the grouting construction quality is guaranteed.

Description

Technical Field

[0001] This patent relates to the field of pile foundation grouting technology, specifically a pile foundation post-grouting pipe joint. Background Art

[0002] Grouting piles use grouting pipes pre-buried at the bottom and sides of the steel cage to perform high-pressure grouting with a high-pressure pump within 2-30 days after the pile is formed. The slurry combines with the soil around the pile body through infiltration, splitting, filling, and compaction, solidifying the sediment at the bottom of the pile and the mud skin on the side of the pile, thereby improving the bearing capacity and reducing settlement. Post-grouting technology includes post-grouting at the bottom of the pile, post-grouting at the side of the pile, and post-grouting at the bottom and side of the pile.

[0003] The commonly used method for pile side grouting is to set holes at the joints of the grouting pipe. However, since the grouting pipe is installed inside the steel bar hole, the distance between the grouting pipe and the outer diameter of the pile is 5 to 10 cm. After the concrete is poured, the splitting effect of the holes at the joints of the grouting pipe is poor, resulting in the pile side grouting amount failing to meet the design requirements. Therefore, the existing technology needs to be improved. Utility Model Content

[0004] The purpose of this patent is to provide a pile foundation post-grouting pipe joint to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, this patent provides the following technical solutions: a pile foundation post-grouting pipe joint, comprising a pile foundation pipe with a three-way joint, a grouting pipe is welded at the vertical end interface of the pile foundation pipe, and grouting pipes are installed at the interfaces on both sides of the horizontal end of the pile foundation pipe;

[0006] A fixing hoop is clamped between the grouting pipe and the pile foundation pipe, and fastening plates are installed on both sides of the opening of the fixing hoop;

[0007] The side wall of the fastening plate is provided with a fastening screw hole, and a bolt body is screwed into the fastening screw hole;

[0008] A circular groove is formed at the bottom end of the bolt body, a bolt rod is installed in the circular groove, and a fastening nut is screwed to the outer wall of the fastening plate outside the bolt rod;

[0009] The top of the grouting pipe and the outer wall of the grouting pipe are evenly provided with grouting holes.

[0010] Preferably, a fastening groove is provided at the bottom end of the bolt rod, a fastening bolt is arranged inside the fastening groove, grooves are provided around the outer wall of the bolt rod along the fastening groove, and a reverse thread is provided on the inner wall of the fastening groove.

[0011] Preferably, a fixing ring is installed on the outer upper end of the bolt rod, and an annular pressing plate, a spring and an annular rubber sheet are mounted on the circumferential surface of the bolt rod.

[0012] Preferably, a clamping cavity is provided on the inner wall of the fixing hoop, and a clamping block is provided on the outer wall of the grouting connecting pipe, and the clamping block is arranged in the clamping cavity.

[0013] Preferably, the inner wall of the fixing hoop is provided with a rubber layer, and the outer wall of the bottom end of the fixing hoop is provided with an abutment surface.

[0014] Preferably, the outer wall of the grouting pipe is provided with an external thread, and the inner wall of the pile foundation pipe is provided with an internal thread.

[0015] Preferably, the grouting pipe is formed by casting steel bars and concrete layers.

[0016] Compared with the prior art, the beneficial effects of this patent are: the setting of the post-grouting pipe joint of the pile foundation has a reasonable structural design; the adopted T-type grouting structure can be fixed with the pile foundation steel cage to ensure the stability of the grouting range and has a certain positioning effect; the designed double grouting pipe is convenient and easy to connect, and can effectively impact the holes of the grouting pipe to ensure the quality of the pouring construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of this patent;

[0018] Figure 2 This is a schematic diagram of the fixing hoop of the present patent;

[0019] Figure 3 This is a schematic diagram of the bolt body of this patent;

[0020] Figure 4 This is a top view of the bolt rod of this patent.

[0021] In the figure: 1 pile foundation pipe, 2 grouting pipe, 3 fixing hoop, 4 grouting pipe, 5 grouting hole, 6 clamping block, 7 clamping cavity, 8 steel bar, 9 concrete layer, 10 abutment surface, 11 rubber layer, 12 fastening plate, 13 bolt body, 131 bolt rod, 132 annular rubber sheet, 133 circular groove, 134 annular pressing sheet, 135 extrusion block, 136 fixing ring, 137 spring, 138 fastening nut, 14 fastening screw hole, 15 fastening groove, 16 fastening bolt, 17 slot, 18 reverse thread. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of this patent to clearly and completely describe the technical solutions in the embodiments of this patent. Obviously, the described embodiments are only part of the embodiments of this patent, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0023] See also Figure 1-4 , this patent provides a technical solution:

[0024] In the technical scheme, a post-grouting pipe joint for pile foundation comprises a pile foundation pipe 1 with a three-way joint, a grouting pipe 4 is welded at the vertical end interface of the pile foundation pipe 1, and grouting pipes 2 are installed at the interfaces on both sides of the horizontal end of the pile foundation pipe 1. The pile foundation pipe 1 is a pipe with a three-way joint, one interface is arranged at the vertical end, and two interfaces are arranged on both sides of the horizontal end. The grouting pipe 4 is a top-closed pipe, which is welded in the interface of the vertical end, and the grouting pipe 2 is inserted into the interface of the horizontal end.

[0025] A fixing hoop 3 is clamped between the grouting pipe 2 and the pile foundation pipe 1, and fastening plates 12 are installed on both sides of the opening of the fixing hoop 3. After the grouting pipe 2 is installed in the pile foundation pipe 1, the connection between the two is fixed by the fixing hoop 3. The fixing hoop 3 is an elastic structure, and two fastening plates 12 are arranged at the opening of the fixing hoop 3. The two fastening plates 12 move relative to each other to lock the fixing hoop 3.

[0026] The side wall of the fastening plate 12 is provided with a fastening screw hole 14, and a bolt body 13 is screwed into the fastening screw hole 14;

[0027] A circular groove 133 is formed at the bottom end of the bolt body 13, a bolt rod 131 is installed in the circular groove 133, a fastening nut 138 is screwed to the outer wall of the fastening plate 12 on the outside of the bolt rod 131, the bolt rod 131 is vertically installed in the circular groove 133, the bolt rod 131 is screwed into the fastening screw hole 14, the two fastening plates 12 are relatively moved under the thread matching, and then locked by the fastening nut 138;

[0028] Grouting holes 5 are evenly formed at the top of the grouting pipe 4 and the outer wall of the grouting pipe 4 .

[0029] A fastening groove 15 is provided at the bottom end of the bolt rod 131, and a fastening bolt 16 is arranged inside the fastening groove 15. Slots 17 are provided around the outer wall of the bolt rod 131 along the fastening groove 15, and a reverse thread 18 is provided on the inner wall of the fastening groove 15. The fastening bolt 16 is an expansion bolt. After the fastening bolt 16 is screwed into the fastening groove 15, the bottom of the bolt rod 131 divided into four parts by the slot 17 is stretched open to prevent the fastening nut 138 from falling off.

[0030] A fixing ring 136 is installed on the outer upper end of the bolt rod 131, and an annular pressing sheet 134, a spring 137 and an annular rubber sheet 132 are mounted on the circumferential surface of the bolt rod 131;

[0031] The annular pressing sheet 134 is located on the upper side of the fixing ring 136 , the spring 137 is located on the upper side of the annular pressing sheet 134 , and the annular rubber sheet 132 is located on the lower side of the fixing ring 136 .

[0032] The inner wall of the fixing hoop 3 is provided with a clamping cavity 7, and the outer wall of the grouting pipe 2 is provided with a clamping block 6, which is arranged in the clamping cavity 7. When installing the fixing hoop 3, the clamping block 6 is clamped into the clamping cavity 7, which can not only position the fixing hoop 3 during installation, but also improve the connection strength.

[0033] The inner wall of the fixing hoop 3 is provided with a rubber layer 11, and the outer wall of the bottom end of the fixing hoop 3 is provided with a supporting surface 10. The rubber layer 11 can increase the friction of the inner wall of the fixing hoop 3. After the fixing hoop 3 is installed, the supporting surface 10 can be in contact with the ground to improve stability.

[0034] The outer wall of the grouting pipe 2 is provided with an external thread, and the inner wall of the pile foundation pipe 1 is provided with an internal thread. The grouting pipe 2 is installed in the pile foundation pipe 1 by threaded connection.

[0035] The grouting pipe 2 is formed by pouring steel bars 8 and a concrete layer 9 .

[0036] Working process and principle: When in use, first, install the grouting pipe 2 to the interfaces at both ends of the pile foundation pipe 1, then face the grouting pipe 4 to the outside of the pile foundation, and wrap the grouting pipe 4 with tape or plastic film. The two grouting pipes 2 are grouting into the pile foundation pipe 1 at the same time, and the injected slurry enters the grouting pipe 4 through the pile foundation pipe 1. When the pressure reaches a certain level, the tape or plastic film wrapped around the grouting pipe 4 is broken, and the injected slurry enters the gap on the side of the pile foundation.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although the present invention has been described above with reference to the embodiments, various modifications may be made to the embodiments and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in the present specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pile foundation post-grouting pipe joint, comprising a pile foundation pipe (1) with a tee joint, characterized in that: A grouting pipe (4) is welded at the vertical end interface of the pile foundation pipe (1), and grouting pipes (2) are installed at the interfaces on both sides of the horizontal end of the pile foundation pipe (1); A fixing hoop (3) is clamped between the grouting pipe (2) and the pile foundation pipe (1), and fastening plates (12) are installed on both sides of the opening of the fixing hoop (3); The side wall of the fastening plate (12) is provided with a fastening screw hole (14), and a bolt body (13) is screwed into the fastening screw hole (14); A circular groove (133) is formed at the bottom end of the bolt body (13), a bolt rod (131) is installed in the circular groove (133), and a fastening nut (138) is screwed to the outer wall of the fastening plate (12) outside the bolt rod (131); Grouting holes (5) are evenly formed at the top of the grouting pipe (4) and on the outer wall of the grouting pipe (4).

2. A pile foundation post-grouting pipe joint according to claim 1, characterized in that: A fastening groove (15) is provided at the bottom end of the bolt rod (131), a fastening bolt (16) is arranged inside the fastening groove (15), slots (17) are provided around the outer wall of the bolt rod (131) along the fastening groove (15), and a reverse thread (18) is provided on the inner wall of the fastening groove (15).

3. A post-grouting pipe joint for pile foundation according to claim 2, characterized in that: A fixing ring (136) is installed on the outer upper end of the bolt rod (131), and an annular pressing sheet (134), a spring (137) and an annular rubber sheet (132) are mounted on the circumferential surface of the bolt rod (131).

4. A post-grouting pipe joint for pile foundation according to claim 1, characterized in that: The inner wall of the fixing hoop (3) is provided with a clamping cavity (7), the outer wall of the grouting pipe (2) is provided with a clamping block (6), and the clamping block (6) is arranged in the clamping cavity (7).

5. A post-grouting pipe joint for pile foundation according to claim 4, characterized in that: The inner wall of the fixing hoop (3) is provided with a rubber layer (11), and the outer wall of the bottom end of the fixing hoop (3) is provided with a contact surface (10).

6. A pile foundation post-grouting pipe joint according to claim 1, characterized in that: The outer wall of the grouting pipe (2) is provided with an external thread, and the inner wall of the pile foundation pipe (1) is provided with an internal thread.

7. The post-grouting pipe joint for pile foundation according to claim 1, characterized in that: The grouting pipe (2) is formed by pouring steel bars (8) and a concrete layer (9).

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