High-pressure jet grouting pile grouting pipe plugging structure

Abstract

The utility model discloses a plugging structure for a grouting pipe of a high-pressure jet grouting pile, which belongs to the technical field of high-pressure jet grouting pile construction and is used for plugging a gap between the grouting pipe and a guide hole through an upper annular disc, a lower annular disc and an elastic sealing ring. Specifically, the outer diameter of the elastic sealing ring is smaller than the inner diameter of the guide hole when the elastic sealing ring is not subjected to internal pressure, and the guniting pipe is not subjected to guniting when the elastic sealing ring is not subjected to internal pressure; the outer diameter of the elastic sealing ring is larger than or equal to the inner diameter of the guide hole when the elastic sealing ring is subjected to internal pressure, guniting is started when the elastic sealing ring is subjected to internal pressure, namely when a gap between the grouting pipe and the guide hole needs to be plugged, the outer diameter of the elastic sealing ring is larger than or equal to the inner diameter of the guide hole, and plugging is achieved. The plugging structure is prevented from influencing upward spraying pipe; the defect that the strength and the construction effect of the high-pressure jet grouting pile are affected by an existing plugging structure with the fixed outer diameter is overcome through the arranged elastic sealing ring.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-pressure rotary jet pile construction, and in particular relates to a high-pressure rotary jet pile grouting pipe blocking structure. Background Art

[0002] Collapsible loess refers to soil that undergoes significant additional deformation due to structural damage of the soil after immersion in water under the action of the self-weight stress of the overlying soil layer, or under the combined action of the self-weight stress and additional stress. It is a special soil. When roads or houses are directly built on this type of soil, there is a great risk of settlement. Therefore, when constructing buildings on this type of geology, the first step is to reinforce the foundation. At present, high-pressure rotary jet piles are generally used to treat the foundation. Specifically, the location where the hole needs to be drilled is first marked according to the design drawings. After drilling, the grouting pipe is inserted into the lower part of the drilled lead hole, and the slurry outlet is rotated and sprayed under a certain pressure. After the cement slurry is fully mixed with the pile end soil, the grouting pipe is lifted by rotating in the reverse direction at a uniform speed while spraying, and the mud is poured into the lead hole through rotation to form a rotary jet pile.

[0003] Since the inner diameter of the lead hole is larger than the outer diameter of the grouting pipe, when high-pressure rotary grouting is performed, slurry will appear, which is easy to cause the situation of low strength of the lower part of the rotary grouting pile. In order to solve this problem, the patent document with publication number CN215210997U discloses a high-pressure rotary grouting pile grouting pipe plugging structure, the surface of the rotary grouting pile grouting pipe body is provided with a first annular plugging disk and a second annular plugging disk, the second annular plugging disk is located above the first annular plugging disk, and the bottom of the second annular plugging disk is fixed to the connection between the foundation. By setting the first annular plugging disk and the second annular plugging disk, a large amount of grouting liquid can be avoided from being lost, the grouting pressure is effectively maintained, and the reinforcement area after grouting is guaranteed. However, in this scheme, the outer diameter of the first annular plugging disk is equal to the inner diameter of the lead hole, but the grouting pipe needs to rotate upward during the grouting process, and the first annular plugging disk and the lead hole will have different degrees of friction, which may scrape the inner wall soil of the lead hole, affecting the strength of the high-pressure rotary grouting pile, and may also affect the rising effect of the grouting pipe.

[0004] In summary, the existing fixed outer diameter plugging structure has defects that affect the strength and construction effect of the high-pressure jet grouting pile. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a high-pressure rotary jet pile grouting pipe plugging structure for the above-mentioned deficiencies in the prior art, which has a novel and reasonable design, a simple structure and can achieve a good plugging effect.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0007] A high-pressure rotary jet pile grouting pipe sealing structure, the sealing structure is used to be arranged on the upper part of the grouting pipe outlet, the sealing structure includes an upper annular disk, a lower annular disk and an elastic sealing ring; the elastic sealing ring is located between the upper annular disk and the lower annular disk, the upper annular disk and the lower annular disk are movably connected by an annular disk connector, the outer diameter of the elastic sealing ring is smaller than the inner diameter of the lead hole when not subjected to internal pressure, and the outer diameter of the elastic sealing ring is greater than or equal to the inner diameter of the lead hole when subjected to internal pressure, and the outer diameters of the upper annular disk and the lower annular disk are both smaller than the inner diameter of the lead hole.

[0008] Furthermore, the annular disk connecting member is a reamed hole bolt, which passes through the reamed holes of the upper annular disk, the elastic sealing ring and the lower annular disk in sequence and cooperates with the nut to achieve the connection between the upper annular disk and the lower annular disk. At least two corresponding reamed holes are opened.

[0009] Furthermore, an annular step surface for placing a nut is provided at the lower end of the reaming hole of the lower annular disk.

[0010] Furthermore, four reaming holes are correspondingly provided.

[0011] Furthermore, the elastic sealing ring adopts a B-shaped sealing ring structure, and the wave crest of the B-shaped sealing ring is arranged adjacent to the upper annular disk.

[0012] Furthermore, it also includes an annular connector, the outer diameter of which is equal to the inner diameter of the upper annular disk, the outer side of which is fixedly connected to the inner side of the upper annular disk, and the inner side of which is used to connect to the outer wall of the grouting pipe.

[0013] Furthermore, the inner side surface of the annular connecting piece is connected to the outer wall of the grouting pipe via a fixing screw.

[0014] Furthermore, both the upper annular disk and the lower annular disk adopt a flange structure.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The high-pressure rotary jet pile grouting pipe plugging structure achieves the plugging of the gap between the grouting pipe and the lead hole through the upper annular disk, the lower annular disk and the elastic sealing ring. Specifically, since the outer diameters of the upper annular disk and the lower annular disk are smaller than the inner diameter of the lead hole, the upper annular disk and the lower annular disk will not affect the rise of the grouting pipe. When not subjected to internal pressure, the outer diameter of the elastic sealing ring is smaller than the inner diameter of the lead hole. When not subjected to internal pressure, it means that the grouting pipe has not been sprayed yet; when subjected to internal pressure, the outer diameter of the elastic sealing ring is greater than or equal to the inner diameter of the lead hole. When subjected to internal pressure, it means when the grouting starts, that is, when the gap between the grouting pipe and the lead hole needs to be plugged, the outer diameter of the elastic sealing ring is greater than or equal to the inner diameter of the lead hole. The reason is that when the grouting starts, pressure will be generated at the lower part of the lead hole, and the pressure will squeeze the lower annular disk, causing the lower annular disk to squeeze the elastic annular member, and the annular seal will be subjected to upward pressure. Because the elastic sealing ring receives downward pressure from the upper annular disk, these two pressures cause the elastic annular ring to deform radially, and the outer diameter of the elastic sealing ring increases. In addition, when the shotcrete pipe moves upward, the space at the bottom of the sealing structure becomes larger, the internal pressure on the lower annular disk decreases, the corresponding pressure on the elastic sealing ring decreases, the deformation becomes smaller, and the outer diameter decreases at the same time; the blocking structure is prevented from affecting the upward movement of the shotcrete pipe; that is, the elastic sealing ring is set to eliminate the defects of the existing fixed outer diameter blocking structure that affects the strength and construction effect of the high-pressure rotary jet pile.

[0017] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of an embodiment of the high-pressure rotary jet pile grouting pipe plugging structure of the utility model;

[0019] Figure 2 It is a top view structural schematic diagram of an embodiment of the high-pressure rotary jet pile grouting pipe plugging structure of the utility model;

[0020] Figure 3 It is a structural schematic diagram of an embodiment of the high-pressure rotary jet pile grouting pipe plugging structure of the utility model installed on a grouting pipe;

[0021] Description of reference numerals:

[0022] 1. Ring connector; 2. Fixing screw; 3. Elastic sealing ring; 4. Reamed hole;

[0023] 5. Reamed hole bolt; 6. Nut; 7. Upper annular plate; 8. Lower annular plate; 9. Annular step surface;

[0024] 10. Grouting pipe; 11. Inlet hole; 12. Collapsible loess foundation; 13. Grout outlet. DETAILED DESCRIPTION

[0025] High-pressure jet grouting pipe plugging structure embodiment:

[0026] When the strength of the collapsible loess foundation 12 is enhanced by pouring high-pressure jet grouting piles, since the inner diameter of the guide hole is larger than the outer diameter of the grouting pipe 10, grouting may occur during high-pressure rotary grouting, which may easily lead to low strength of the lower part of the jet grouting pile.

[0027] To solve this problem, Figure 1 , Figure 2 As shown, the high-pressure rotary jet pile grouting pipe plugging structure is used to be arranged on the upper part of the grouting outlet 13 of the grouting pipe 10, and is used to plug the gap between the grouting pipe 10 and the lead hole 11 when the grouting outlet 13 is sprayed, so as to avoid a large amount of mud from the grouting outlet 13 overflowing and affecting the mixing of the mud and the lead hole 11. The plugging structure includes an upper annular disk 7, a lower annular disk 8 and an elastic sealing ring 3; the upper annular disk 7, the elastic sealing ring 3 and the lower annular disk 8 are arranged in sequence from top to bottom, and the upper annular disk 7 and the lower annular disk 8 are movably connected by an annular disk connector, and the elastic sealing ring 3 is clamped between the upper annular disk 7 and the lower annular disk 8. The size of the elastic sealing ring 3 is such that the outer diameter of the elastic sealing ring 3 is smaller than the inner diameter of the lead hole 11 when not subjected to internal pressure, and the outer diameter of the elastic sealing ring 3 is greater than or equal to the inner diameter of the lead hole 11 when subjected to internal pressure. In order to prevent the upper annular disk 7 and the lower annular disk 8 from affecting the up and down movement of the grouting pipe 10 in the introduction hole 11 , the outer diameters of the upper annular disk 7 and the lower annular disk 8 are both smaller than the inner diameter of the introduction hole 11 .

[0028] In order to realize the movable connection between the upper annular disk 7 and the lower annular disk 8, the annular disk connecting member is a reaming hole bolt 5, which passes through the reaming hole 4 of the upper annular disk 7, the elastic sealing ring 3 and the lower annular disk 8 in sequence and cooperates with the nut 6 to realize the connection between the upper annular disk 7 and the lower annular disk 8. Since a section of the reaming hole bolt 5 is not threaded, it is convenient for the lower annular disk 8 to move upward when subjected to internal pressure, and the reaming hole bolt 5 can also play a good positioning role. When assembling the upper annular disk 7 and the lower annular disk 8, the connection will not be too tight or too loose, which is convenient for the production and assembly of the plugging structure.

[0029] In order to ensure the neatness of the sealing structure, an annular step surface 9 for placing the nut 6 is opened at the lower end of the hinged hole 4 of the lower annular disk 8. If there is no annular step surface 9, the nut 6 will protrude after installation, which not only affects the neatness of the windage device, but also occupies a large space, resulting in inconvenience in transportation.

[0030] In order to well limit the position of the elastic sealing ring 3, at least two reaming holes 4 are correspondingly provided. Preferably, four reaming holes 4 are correspondingly provided.

[0031] like Figure 2As shown, in order to ensure that the elastic sealing ring 3 has a more obvious effect on the internal pressure, the elastic sealing ring 3 adopts a B-shaped sealing ring structure, that is, the upper side of the annular seal presents two wave peak structures. The above-mentioned B-shaped sealing ring wave peak is arranged adjacent to the upper annular disk 7, and the wave peak structure is more likely to deform radially when subjected to extrusion force. The elastic sealing ring 3 can also adopt other elastic member structures that can achieve the same effect. In addition, the wave peak of the B-shaped sealing ring is arranged adjacent to the lower annular disk 8 to achieve the same effect.

[0032] like Figure 3 As shown, it also includes an annular connector 1, the outer diameter of the annular connector 1 is equal to the inner diameter of the upper annular disk 7, the outer side surface of the annular connector 1 is fixedly connected to the inner side surface of the upper annular disk 7, and the inner side surface of the annular connector 1 is used to connect to the outer wall of the grouting pipe 10. Preferably, the inner side surface of the annular connector 1 is connected to the outer wall of the grouting pipe 10 through a fixing screw 2. By cooperating with the annular connector 1 and the fixing screw 2, the inner diameter of the plugging structure is changed, so that the plugging structure can be well stuck on the grouting pipe 10. It is also acceptable to fix the plugging structure to the grouting pipe 10 in other ways. Preferably, the upper annular disk 7 and the lower annular disk 8 both adopt a flange structure.

[0033] When the utility model is used, first, the plugging structure is assembled, and then the fixing bolts and the annular connector 1 are used to fix the plugging structure to the outer wall of the grouting pipe 10, and then it can be directly put into use. The plugging effect of the plugging structure mainly relies on the deformation of the elastic sealing ring 3 when it is subjected to internal pressure to achieve plugging. When it is not subjected to internal pressure, the outer diameter of the elastic sealing ring 3 is smaller than the inner diameter of the lead hole 11 and does not affect the rise of the grouting pipe 10. It can passively deform according to the change of internal pressure, which well eliminates the defects of the existing plugging structure with fixed outer diameter that affects the strength and construction effect of high-pressure rotary jet piles.

[0034] The above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A high-pressure jet grouting pipe plugging structure, the plugging structure is used to be arranged on the upper part of the grouting outlet (13) of the grouting pipe (10), characterized in that: The sealing structure comprises an upper annular disk (7), a lower annular disk (8) and an elastic sealing ring (3); the elastic sealing ring (3) is located between the upper annular disk (7) and the lower annular disk (8); the upper annular disk (7) and the lower annular disk (8) are movably connected via an annular disk connecting member; when not subjected to internal pressure, the outer diameter of the elastic sealing ring (3) is smaller than the inner diameter of the guide hole (11); when subjected to internal pressure, the outer diameter of the elastic sealing ring (3) is greater than or equal to the inner diameter of the guide hole (11); and the outer diameters of the upper annular disk (7) and the lower annular disk (8) are both smaller than the inner diameter of the guide hole (11).

2. The high-pressure jet grouting pipe plugging structure according to claim 1 is characterized in that: The annular disk connecting member is a reaming hole bolt (5), which passes through the reaming holes (4) of the upper annular disk (7), the elastic sealing ring (3) and the lower annular disk (8) in sequence and cooperates with the nut (6) to achieve the connection between the upper annular disk (7) and the lower annular disk (8), and at least two reaming holes (4) are correspondingly opened.

3. The high-pressure jet grouting pipe plugging structure according to claim 2 is characterized in that: The lower end of the reaming hole (4) of the lower annular disk (8) is provided with an annular step surface (9) for placing a nut (6).

4. The high-pressure jet grouting pipe plugging structure according to claim 2 is characterized in that: The reaming holes (4) are provided with four.

5. The high-pressure jet grouting pipe plugging structure according to claim 1 is characterized in that: The elastic sealing ring (3) adopts a B-shaped sealing ring structure, and the wave crest of the B-shaped sealing ring is arranged adjacent to the upper annular disk (7).

6. The high-pressure jet grouting pipe plugging structure according to claim 1 is characterized in that: It also includes an annular connecting piece (1), the outer diameter of the annular connecting piece (1) is equal to the inner diameter of the upper annular disk (7), the outer side surface of the annular connecting piece (1) is fixedly connected to the inner side surface of the upper annular disk (7), and the inner side surface of the annular connecting piece (1) is used to connect to the outer wall of the grouting pipe (10).

7. The high-pressure jet grouting pipe plugging structure according to claim 6 is characterized in that: The inner side surface of the annular connecting piece (1) is connected to the outer wall of the grouting pipe (10) via a fixing screw (2).

8. The high-pressure jet grouting pipe plugging structure according to claim 1 is characterized in that: The upper annular disk (7) and the lower annular disk (8) both adopt flange structures.

Images