Tool structure suitable for grouting valve of cast-in-situ bored pile

Abstract

The tool structure comprises a JDG steel pipe, a grouting pipe, a steel sleeve, a PVC corrugated pipe, a waterproof insulating tape and a matched nut, the upper end of the JDG steel pipe is connected with the grouting pipe, the steel sleeve connected in a welded mode is fixedly arranged outside the connecting position of the JDG steel pipe and the grouting pipe in a sleeved mode, and the PVC corrugated pipe is connected with the waterproof insulating tape in a sleeved mode. A plurality of grout outlet holes are formed in the lower middle portion of the JDG steel pipe, a plurality of circles of PVC corrugated pipes are arranged on the outer sides of the grout outlet holes in a surrounding mode, the outer sides of the PVC corrugated pipes are wound and wrapped by the waterproof insulating rubber tape, and the bottom of the JDG steel pipe is plugged through the matched nut. The PVC corrugated pipe structure is used for achieving opening when grouting reaches the designed pressure and closing when the grouting pressure drops to prevent backflow, the manufacturing method is simple, manufacturing materials are easy to obtain, the manufacturing cost is low, and the construction quality and the construction efficiency of pile foundation grouting can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building foundation engineering, in particular to a tool structure suitable for a bored pile grouting valve. Background Art

[0002] Pile foundation engineering is an important sub-division of foundation engineering. In order to ensure the quality of subsequent grouting construction of pile foundation, the control of pile foundation construction quality is particularly important. Traditional tool products have the problem of cement slurry backflow after grouting is stopped, resulting in loose grouting, which seriously affects the construction quality and construction efficiency of pile foundation grouting. Utility Model Content

[0003] The utility model aims to solve the deficiencies of the prior art and provides a tool structure suitable for a bored pile grouting valve.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a tool structure suitable for a bored pile grouting valve, comprising: a JDG steel pipe, a grouting pipe, a steel casing, a PVC corrugated pipe, a waterproof insulating tape, and a nut. The upper end of the JDG steel pipe is connected to the grouting pipe, and the external fixed sleeve of the connection between the JDG steel pipe and the grouting pipe is provided with a steel casing connected by welding. A plurality of slurry holes are provided in the middle and lower part of the JDG steel pipe, and the outer side of the slurry holes is surrounded by a plurality of circles of the PVC corrugated pipe. The outer side of the PVC corrugated pipe is wrapped with the waterproof insulating tape. The bottom of the JDG steel pipe is connected to the nut, and the bottom of the nut is closed.

[0005] Furthermore, the lowermost end of the JDG steel pipe is covered with an external thread, and the nut is screwed to the JDG steel pipe through the external thread.

[0006] Furthermore, the slurry outlet holes are arranged in a plum blossom shape, and the number of the slurry outlet holes is 14-18.

[0007] Furthermore, the JDG steel pipe has a length of 280mm-300mm, a diameter of 25mm, and a wall thickness of 3mm; the grouting pipe is a 25mm SC welded pipe with a wall thickness of 3mm; the steel casing has a diameter of 32mm, a wall thickness of 3mm, and the overlap length of the steel casing is greater than or equal to 150mm.

[0008] Furthermore, the diameter of the pulp outlet hole is 10 mm.

[0009] Furthermore, the wall thickness of the PVC corrugated pipe is 0.6 mm, and the overlap length of each circle of the PVC corrugated pipe is greater than or equal to 10 mm.

[0010] Furthermore, the length of the external thread is 20 mm, and the number of rotating threads at the connection between the external thread and the nut is greater than or equal to 5.

[0011] The beneficial effects of the utility model are as follows: the utility model uses a PVC corrugated pipe structure to open when the grouting reaches the designed pressure, and close to prevent backflow when the grouting pressure drops. The production method is simple, the production materials are easy to obtain, and the production cost is low. It can effectively improve the construction quality and construction efficiency of pile foundation grouting. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural sectional view of the utility model;

[0013] In the figure: 1-JDG steel pipe; 2-grouting pipe; 3-steel casing; 4-PVC corrugated pipe; 5-waterproof insulation tape; 6-nut; 7-slurry outlet hole; 8-external thread;

[0014] The drawings in this utility model are all schematic diagrams, and their sizes do not represent actual sizes;

[0015] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0017] like Figure 1 As shown, a tool structure suitable for a bored pile grouting valve comprises: a JDG steel pipe 1, a grouting pipe 2, a steel casing 3, a PVC corrugated pipe 4, a waterproof insulating tape 5, and a nut 6. The upper end of the JDG steel pipe 1 is connected to the grouting pipe 2, and the external fixed sleeve of the connection between the JDG steel pipe 1 and the grouting pipe 2 is provided with a steel casing 3 connected by welding. A plurality of slurry holes 7 are provided in the middle and lower part of the JDG steel pipe 1, and the outer side of the slurry holes 7 is surrounded by a plurality of circles of the PVC corrugated pipe 4. The outer side of the PVC corrugated pipe 4 is wrapped with the waterproof insulating tape 5. The bottom of the JDG steel pipe 1 is connected to the nut 6, and the bottom of the nut 6 is closed. Each circle of the PVC corrugated pipe 4 is set to be open. When the grouting pressure starts, the cement slurry flows out from the slurry outlet hole 7, and the PVC corrugated pipe 4 and the waterproof insulating tape 5 are pushed open to achieve grouting; when the grouting pressure stops, the PVC corrugated pipe 4 returns to its original position, blocking the slurry outlet hole 7 to prevent the cement slurry from flowing back.

[0018] The lowermost end of the JDG steel pipe 1 is sleeved with an external thread 8 , and the nut 6 is screwed to the JDG steel pipe 1 via the external thread 8 .

[0019] The slurry outlet holes 7 are arranged in a plum blossom shape, the number of the slurry outlet holes 7 is 14-18, and the net distance between the slurry outlet holes 7 is 15mm-20mm.

[0020] The JDG steel pipe 1 has a length of 280mm-300mm, a diameter of 25mm, and a wall thickness of 3mm; the grouting pipe 2 is an SC welded pipe with a diameter of 25mm and a wall thickness of 3mm; the steel casing 3 has a diameter of 32mm and a wall thickness of 3mm, and the overlap length of the steel casing 3 is greater than or equal to 150mm.

[0021] The diameter of the pulp outlet hole 7 is 10 mm.

[0022] The wall thickness of the PVC corrugated tube 4 is 0.6 mm, and the overlapping length of each circle of the PVC corrugated tube 4 is greater than or equal to 10 mm.

[0023] The length of the outer thread 8 is 20 mm, and the number of rotating threads at the connection between the outer thread 8 and the nut 6 is greater than or equal to 5.

[0024] When using the utility model, first check whether the bottom of the JDG steel pipe 1 and the nut 6 are tightened without any gap, and whether the slurry outlet 7 is wrapped by the open PVC corrugated pipe 4 and wrapped with a circle of special waterproof insulation tape 5 to seal it in place. After the inspection is completed, it is connected with the grouting pipe 2 and the steel casing 3 and welded. When grouting is required, grouting is carried out on the top of the grouting pipe 2. As the grouting proceeds, the pressure in the entire grouting pipe 2 increases. When the grouting pressure exceeds 1.2MPa, the PVC corrugated pipe 4 and the special waterproof insulation tape 5 wrapped around the outside of the slurry outlet 7 are pushed open, and the cement slurry flows out, thus completing the entire grouting process.

[0025] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or they are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A tool structure suitable for a bored pile grouting valve, characterized in that: include: A JDG steel pipe (1), a grouting pipe (2), a steel casing (3), a PVC corrugated pipe (4), a waterproof insulating tape (5), and a nut (6); the upper end of the JDG steel pipe (1) is connected to the grouting pipe (2); the outer fixed sleeve of the connection between the JDG steel pipe (1) and the grouting pipe (2) is provided with a steel casing (3) connected by welding; a plurality of slurry outlet holes (7) are provided in the middle and lower part of the JDG steel pipe (1); the outer sides of the slurry outlet holes (7) are surrounded by a plurality of circles of the PVC corrugated pipe (4); the outer sides of the PVC corrugated pipe (4) are wrapped with the waterproof insulating tape (5); the bottom of the JDG steel pipe (1) is connected to the nut (6); and the bottom of the nut (6) is closed.

2. A tool structure suitable for a bored pile grouting valve according to claim 1, characterized in that: The lowermost end of the JDG steel pipe (1) is sleeved with an external thread (8), and the nut (6) is screwed to the JDG steel pipe (1) via the external thread (8).

3. A tool structure suitable for a bored pile grouting valve according to claim 1, characterized in that: The pulp outlet holes (7) are arranged in a plum blossom shape, and the number of the pulp outlet holes (7) is 14-18.

4. The tool structure suitable for a bored pile grouting valve according to claim 1, characterized in that: The JDG steel pipe (1) has a length of 280 mm to 300 mm, a diameter of 25 mm, and a wall thickness of 3 mm; the grouting pipe (2) is an SC welded pipe with a diameter of 25 mm and a wall thickness of 3 mm; the steel casing (3) has a diameter of 32 mm and a wall thickness of 3 mm, and the overlap length of the steel casing (3) is greater than or equal to 150 mm.

5. The tool structure suitable for a bored pile grouting valve according to claim 1, characterized in that: The diameter of the pulp outlet hole (7) is 10 mm.

6. The tool structure suitable for a bored pile grouting valve according to claim 1, characterized in that: The wall thickness of the PVC corrugated tube (4) is 0.6 mm, and the overlapping length of each circle of the PVC corrugated tube (4) is greater than or equal to 10 mm.

7. The tool structure suitable for a bored pile grouting valve according to claim 2, characterized in that: The length of the outer thread (8) is 20 mm, and the number of rotating threads at the connection between the outer thread (8) and the nut (6) is greater than or equal to 5.

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