Double-fluid rotary jet grouting drill rod and double-fluid rotary jet grouting construction method

Abstract

The invention relates to the technical field of engineering equipment, and provides a double-fluid rotary jet grouting drill rod and a double-fluid rotary jet grouting construction method. The double-liquid rotary jet grouting drill rod comprises a drill rod body, a quick-setting material nozzle and a slurry material nozzle. The drill rod body is rotationally connected with the rotary spraying drilling machine, and the drill rod body can rotate along the central axis of the drill rod body; the quick-setting material nozzle is mounted on the circumferential side wall of the drill rod body and is used for spraying a quick-setting material to a pile boundary; the slurry material nozzle is installed on the circumferential side wall of the drill rod body, the slurry material nozzle is used for spraying slurry materials to the pile boundary, and in the axial direction of the drill rod body, the slurry material nozzle is located on the side, away from the rotary spraying drilling machine, of the rapid hardening materials; and the spraying path of the rapid hardening material nozzle and the spraying path of the slurry material nozzle intersect at the pile boundary. According to the double-liquid rotary jet grouting drill rod provided by the embodiment of the invention, rapid condensation can be realized, grout runout is reduced, and the problem of non-uniform grouting is solved.

Description

Technical Field

[0001] The invention relates to the technical field of engineering equipment, in particular to a double-liquid rotary jet grouting drill rod and a double-liquid rotary jet grouting construction method. Background Art

[0002] The essence of soft soil foundation grouting reinforcement is to use air pressure or hydraulic pressure to inject solidified slurry into cracks or pores in the soil layer, strengthen the soil layer with high-strength slurry solidification and compact the original soil to improve its physical and mechanical properties, thereby improving its foundation bearing capacity and anti-uplift stability. Grouting technology can be divided into penetration grouting, splitting grouting, compaction grouting and electrochemical grouting.

[0003] The traditional grouting technology is greatly affected by the development of cracks, and is prone to excessive local reinforcement strength or low local reinforcement strength, resulting in poor overall reinforcement effect. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present invention provides a double-liquid rotary jet grouting drill rod and a double-liquid rotary jet grouting construction method.

[0005] In the first aspect, the present application provides a double-liquid rotary jet grouting drill rod, which includes: a drill rod body, which is rotatably connected to the rotary jet drilling rig, and the drill rod body can rotate along its central axis; a quick-setting material nozzle, which is installed on the circumferential side wall of the drill rod body, and the quick-setting material nozzle is used to spray quick-setting material to the pile boundary; a slurry material nozzle, which is installed on the circumferential side wall of the drill rod body, and the slurry material nozzle is used to spray slurry material to the pile boundary, and in the axial direction of the drill rod body, the slurry material nozzle is located on the side of the quick-setting material away from the rotary jet drilling rig; wherein the injection path of the quick-setting material nozzle intersects with the injection path of the slurry material nozzle at the pile boundary.

[0006] In this way, by setting the quick-setting material nozzle and the slurry material nozzle whose injection path intersects at the pile boundary, the slurry material injected to the pile boundary can solidify quickly, reducing the amount of slurry leakage, reducing the impact of cracks on grouting, and improving the uneven reinforcement effect.

[0007] In some embodiments of the present application, the double-liquid rotary jet grouting drill rod also includes: a high-pressure gas nozzle, which is used to spray high-pressure gas toward the pile boundary, and the high-pressure gas nozzle is installed on the circumferential side wall of the drill rod body, and the distance between the high-pressure gas nozzle and the slurry material nozzle is smaller than the distance between the high-pressure gas nozzle and the quick-setting material nozzle.

[0008] In some embodiments of the present application, the injection path of the slurry material nozzle is perpendicular to the boundary of the pile.

[0009] In some embodiments of the present application, the angle between the injection path of the quick-setting material nozzle and the pile boundary is a first angle, and the first angle is greater than or equal to 60° and less than or equal to 80°.

[0010] In some embodiments of the present application, the distance between the grouting material nozzle and the quick-setting material nozzle is a first distance, and the first distance is greater than or equal to 15 cm and less than or equal to 20 cm.

[0011] In some embodiments of the present application, the double-liquid rotary jet grouting drill rod further includes: a grouting material pipe, which passes through the drill rod body and is connected to the grouting material nozzle.

[0012] In some embodiments of the present application, the double-liquid rotary jet grouting drill rod further includes: a quick-setting material tube, which passes through the drill rod body and is connected to the quick-setting material nozzle.

[0013] In some embodiments of the present application, the double-liquid rotary jet grouting drill pipe further includes: a high-pressure gas pipe, which passes through the drill pipe body and is connected to the high-pressure gas nozzle.

[0014] In some embodiments of the present application, oxygen is introduced into the high-pressure gas pipe.

[0015] In the second aspect, the present application provides a double-liquid rotary jet grouting construction method, which is applied to a double-liquid rotary jet grouting drill pipe, and the double-liquid rotary jet grouting drill pipe comprises: a drill pipe body, the drill pipe body is rotatably connected to the rotary jet drilling rig, and the drill pipe body can rotate along its central axis; a quick-setting material nozzle, the quick-setting material nozzle is installed on the circumferential side wall of the drill pipe body, and the quick-setting material nozzle is used to spray quick-setting material to the pile boundary; a slurry material nozzle, the slurry material nozzle is installed on the circumferential side wall of the drill pipe body, and the slurry material nozzle is used to For spraying slurry material toward the boundary of the pile, in the axial direction of the drill rod body, the slurry material nozzle is located on the side of the quick-setting material away from the rotary jet drilling rig; wherein the injection path of the quick-setting material nozzle intersects the injection path of the slurry material nozzle at the boundary of the pile; a high-pressure gas nozzle, the high-pressure gas nozzle is used to spray high-pressure gas toward the boundary of the pile, the high-pressure gas nozzle is installed on the circumferential side wall of the drill rod body, and the distance between the high-pressure gas nozzle and the slurry material nozzle is smaller than the distance between the high-pressure gas nozzle and the quick-setting material nozzle.

[0016] The construction method comprises: S1, drilling a hole to a designed depth in the ground to be constructed to form a pile hole; S2, lowering the double-liquid rotary jet grouting drill rod to the designed depth position, and using a temporary protection structure to protect the slurry material nozzle, the high-pressure gas nozzle, and the quick-setting material nozzle before lowering; S3, first delivering high-pressure gas to the high-pressure gas nozzle to blow off the temporary protection structures on the slurry material nozzle and the high-pressure gas nozzle, delivering quick-setting material to the quick-setting material nozzle to flush off the temporary protection structure on the quick-setting material nozzle, and then reducing the delivery amount of the quick-setting material, continuously delivering high-pressure gas, and rotating the The double-liquid rotary jet grouting drill rod starts to convey the slurry material after rotating one circle, and increases the conveying amount of the quick-setting material to the designed value. The slurry material nozzle sprays the slurry material to the pile boundary, and the high-pressure gas nozzle forms a high-pressure airflow around the slurry material path; S4, the quick-setting material nozzle sprays the quick-setting material to the pile boundary and mixes it with the slurry material; S5, when the injection flow and pressure of the slurry material nozzle, the high-pressure gas nozzle, and the quick-setting material nozzle all reach the designed values, the double-liquid rotary jet grouting drill rod is lifted upward; S6, after the construction is completed, first stop conveying the high-pressure gas, and then stop conveying the slurry material and quick-setting material.

[0017] In this way, during the construction process, high-pressure gas can provide assistance for the injection of slurry materials, reduce the influence of gravity on slurry materials, and ensure the accuracy of the injection position of slurry materials. By setting the quick-setting material nozzle and slurry material nozzle whose injection paths intersect at the pile boundary, the slurry material injected to the pile boundary can be quickly solidified, reducing the amount of slurry leakage, reducing the influence of cracks on grouting, and improving the uneven reinforcement effect.

[0018] In some embodiments of the present application, when the double-liquid rotary jet grouting drill rod rises to a first height, the double-liquid rotary jet grouting drill rod is lowered to a designed depth position again, and the double-liquid rotary jet grouting drill rod is lifted upward again; in some embodiments of the present application, the double-liquid rotary jet grouting construction method also includes: during the lifting of the double-liquid rotary jet grouting drill rod, when the formation changes, the injection pressure of the quick-setting material nozzle, the slurry material nozzle and the high-pressure gas nozzle is adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 A schematic diagram of a double-fluid rotary jet grouting drill pipe provided in some embodiments of the present application;

[0022] Figure 2 for Figure 1 A cross-sectional view of a double-liquid rotary jet grouting drill pipe shown in ;

[0023] Figure 3 for Figure 1 A partial schematic diagram of the double-liquid rotary jet grouting drill pipe shown in FIG.

[0024] Reference numerals:

[0025] 100. Double-liquid rotary jet grouting drill pipe;

[0026] 110. Drill pipe body;

[0027] 120. Quick-setting material nozzle; 121. Quick-setting material tube;

[0028] 130. Slurry material nozzle; 131. Slurry material pipe;

[0029] 140. High-pressure gas nozzle; 141. High-pressure gas pipe. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0032] The essence of soft soil foundation grouting reinforcement is to use air pressure or hydraulic pressure to inject solidified slurry into cracks or pores in the soil layer, strengthen the soil layer with high-strength slurry solidification and compact the original soil to improve its physical and mechanical properties, thereby improving its foundation bearing capacity and anti-uplift stability. Grouting technology can be divided into penetration grouting, splitting grouting, compaction grouting and electrochemical grouting.

[0033] The traditional grouting technology is greatly affected by the development of cracks, and it is easy for the uniform reinforcement strength to be too high and some parts to be unreinforced, resulting in poor overall reinforcement effect.

[0034] It should be noted that when the slurry material is evenly injected in the prior art rotary jet grouting, it takes time for the slurry material to solidify. When cracks appear in local areas of the pile boundary, the unsolidified slurry material will extend along the cracks, resulting in a decrease in the amount of slurry material in the area, which in turn leads to a higher uniform reinforcement strength at the pile boundary and a lower local reinforcement strength, resulting in a poor overall reinforcement effect.

[0035] To solve the above technical problems, please refer to Figure 1 and Figure 2 The present application provides a double-liquid rotary jet grouting drill pipe 100 , which may include: a drill pipe body 110 , a quick-setting material nozzle 120 and a slurry material nozzle 130 .

[0036] Specifically, the drill rod body 110 is formed as a hollow structure, and the drill rod body 110 is rotatably connected to the rotary jet drilling rig. The drill rod body 110 can rotate along its central axis, and the rotary jet drilling rig can drive the drill rod body 110 to move up and down.

[0037] The quick-setting material nozzle 120 is installed on the circumferential side wall of the drill rod body 110. The quick-setting material nozzle 120 is used to spray quick-setting material to the pile boundary. Specifically, a quick-setting material hole is provided on the circumferential side wall of the drill rod body 110. The quick-setting material nozzle 120 is penetrated through the quick-setting material hole to spray quick-setting material to the pile boundary. The double-liquid rotary jet grouting drill rod 100 may also include a quick-setting material pipe 121. The quick-setting material pipe 121 is penetrated through the drill rod body 110. One end of the quick-setting material pipe 121 is connected to the quick-setting material source, and the other end is connected to the quick-setting material nozzle 120, so as to realize the function of conveying quick-setting material to the quick-setting material nozzle 120.

[0038] The slurry material nozzle 130 is installed on the circumferential side wall of the nozzle body. The slurry material nozzle 130 is used to spray slurry material to the pile boundary. Specifically, a slurry material hole is provided on the circumferential side wall of the drill rod body 110. The slurry material nozzle 130 is penetrated in the slurry material hole to spray slurry material to the pile boundary. The double-liquid rotary jet grouting drill rod 100 can also include a slurry material pipe 131, which is penetrated in the drill rod body 110. One end of the slurry material pipe 131 is connected to the slurry material source, and the other end is connected to the slurry material nozzle 130, so as to realize the function of conveying slurry material for the slurry material nozzle 130.

[0039] Specifically, in the axial direction of the drill rod body 110, the slurry material nozzle 130 is located on the side of the quick-setting material nozzle 120 away from the rotary jet drilling rig, that is, when the double-liquid rotary jet grouting drill rod 100 is in use, the slurry material nozzle 130 is located on the lower side of the quick-setting material nozzle 120, so as to prevent the quick-setting material from affecting part of the foundation piles that have been grouted, and at the same time, to prevent the slurry material from blocking the quick-setting material nozzle 120.

[0040] The injection path of the quick-setting material nozzle 120 (eg Figure 1 The path shown by the striped arrow in FIG. 1 ) and the injection path of the slurry material nozzle 130 (eg Figure 1 The paths shown by the solid arrows in FIG. 1 intersect at the pile boundary.

[0041] In this way, by setting the quick-setting material nozzle 120 and the slurry material nozzle 130 whose injection paths intersect at the pile boundary, the slurry material injected to the pile boundary can solidify quickly, reducing the amount of slurry leakage, reducing the impact of cracks on grouting, and improving the uneven reinforcement effect.

[0042] It can be understood that even if cracks are formed in local areas of the pile boundary, after the slurry material is sprayed into the area, the quick-setting material quickly solidifies the grouting material, and then the amount of slurry leakage caused by the cracks makes the reinforcement effect between the area with cracks and the area without cracks the same, thereby improving the uneven reinforcement effect.

[0043] In a specific implementation process, the quick-setting material may be water glass, and the grouting pressure of the quick-setting material may be 1 to 5 MPa. Specifically, the grouting pressure of the quick-setting material may be 1 MPa, 2 MPa, 3 MPa, 4 MPa or 5 MPa. In this way, it can be ensured that the quick-setting material can have sufficient pressure to be sprayed to the pile boundary, while avoiding the situation in which the quick-setting material disperses the grouting material due to excessive spraying pressure.

[0044] The slurry material may be cement slurry with a water-cement ratio of 0.6 to 1.5, and the grouting pressure of the slurry material may be 20 MPa to 60 MPa, and specifically, the grouting pressure of the slurry material may be 20 MPa, 30 MPa, 40 MPa, 50 MPa or 60 MPa. In this way, it can be ensured that the slurry material can be sprayed to the pile boundary with sufficient pressure, and the situation that the rapid setting material disperses the grouting material due to excessive spraying pressure can be avoided.

[0045] In a specific implementation process, the dosage of the quick-setting material is 5% to 10% of the dosage of the slurry material, that is, in the mixture of the quick-setting material and the slurry material, the mass proportion of the quick-setting material is 5% to 10%.

[0046] Furthermore, the spray path of the slurry material nozzle 130 is perpendicular to the pile boundary, so that the distance between the slurry material nozzle 130 and the pile boundary is minimized, which can ensure the stability of the spray path of the slurry material nozzle 130 to the greatest extent.

[0047] It can be understood that, under the influence of gravity, the greater the distance between the slurry material nozzle 130 and the pile boundary, the more unstable the grouting position of the slurry material at the pile boundary.

[0048] Furthermore, the angle between the injection path of the quick-setting material nozzle 120 and the pile boundary is a first angle, which is greater than or equal to 60° and less than or equal to 80°, that is, the angle between the injection path of the quick-setting material nozzle 120 and the horizontal line is greater than or equal to 10° and less than or equal to 30°. Therefore, by setting the injection path of the quick-setting material nozzle 120 to be inclined within this range, it can be ensured that the injection path of the quick-setting material nozzle 120 intersects with the injection path of the slurry material at the pile boundary.

[0049] In a specific implementation process, the first angle can be set to 60°, 65°, 70°, 75° or 80°.

[0050] In some other embodiments of the present application, the quick-setting material nozzle 120 is rotatably disposed on the circumferential side wall of the drill pipe body 110, and the inclination angle of the quick-setting material nozzle 120 can be adjusted according to the size of the foundation aperture to achieve intersection with the slurry material at the pile boundary.

[0051] In some embodiments of the present application, the distance between the grouting material nozzle and the quick-setting material nozzle 120 is a first distance, and the first distance is greater than or equal to 15 cm and less than or equal to 20 cm.

[0052] Therefore, on the one hand, the first distance is greater than or equal to 15 cm, which can avoid the intersection of the quick-setting material and the slurry material before being sprayed to the pile boundary. On the other hand, the first distance is less than or equal to 20 cm, which can reduce the spraying path length of the quick-setting material and the slurry material and improve the overall stability of the grouting.

[0053] In some embodiments of this application, please refer to Figure 2 and Figure 3 The double-liquid rotary jet grouting drill pipe 100 may further include a high-pressure gas nozzle 140, which is installed on the circumferential side wall of the drill pipe body 110, and the distance between the high-pressure gas nozzle 140 and the slurry material nozzle 130 is smaller than the distance between the high-pressure gas nozzle 140 and the quick-setting material nozzle 120. That is, the high-pressure gas nozzle 140 is close to the slurry material, and the high-pressure gas wraps the slurry material to quickly break the soil at the boundary of the pile, and at the same time, the slurry material can be sprayed farther, which is conducive to maintaining the linearity of the spray path of the slurry material.

[0054] For further information, see Figure 3 The high-pressure gas nozzle 140 is formed in a ring shape and is arranged around the outer side of the slurry material nozzle 130, so that the high-pressure gas flow surrounds the slurry material. In this way, the high-pressure gas can provide assistance to the injection of the slurry material, reduce the influence of gravity on the slurry material, and ensure the accuracy of the injection position of the slurry material.

[0055] In some embodiments of this application, please refer to Figure 2 The double-liquid rotary jet grouting drill pipe 100 can also include a high-pressure gas pipe 141, which is penetrated through the drill pipe body 110. One end of the high-pressure gas pipe 141 is connected to the high-pressure gas source, and the other end is connected to the high-pressure gas nozzle 140, thereby realizing the supply of high-pressure gas to the high-pressure gas nozzle 140.

[0056] Furthermore, oxygen is introduced into the high-pressure gas pipe 141. It should be noted that oxygen can act as a catalyst to accelerate the solidification of the slurry material. The oxygen content in the underground space corresponding to the slurry material nozzle 130 is relatively low. By introducing oxygen into the high-pressure gas pipe 141, the oxygen content in the working environment can be improved.

[0057] The present application also proposes a double-liquid rotary jet grouting construction method, which is applied to a double-liquid rotary jet grouting drill rod 100.

[0058] The double-liquid rotary jet grouting drill pipe 100 may include: a drill pipe body 110 , a quick-setting material nozzle 120 , a slurry material nozzle 130 and a high-pressure gas nozzle 140 . The drill rod body 110 is rotatably connected to the rotary jet drilling rig, and the drill rod body 110 can rotate along its central axis; the quick-setting material nozzle 120 is installed on the circumferential side wall of the drill rod body 110, and the quick-setting material nozzle 120 is used to spray quick-setting material to the pile boundary; the slurry material nozzle 130 is installed on the circumferential side wall of the drill rod body 110, and the slurry material nozzle 130 is used to spray slurry material to the pile boundary, and in the axial direction of the drill rod body 110, the slurry material nozzle 130 is located on the side of the quick-setting material away from the rotary jet drilling rig; wherein, the injection path of the quick-setting material nozzle 120 intersects with the injection path of the slurry material nozzle 130 at the pile boundary; the high-pressure gas nozzle 140 is used to spray high-pressure gas to the pile boundary, and the high-pressure gas nozzle 140 is installed on the circumferential side wall of the drill rod body 110, and the distance between the high-pressure gas nozzle 140 and the slurry material nozzle 130 is smaller than the distance between the high-pressure gas nozzle 140 and the quick-setting material nozzle 120.

[0059] Construction methods may include:

[0060] S1. Drill a hole to the designed depth on the ground to be constructed to form a pile hole; it can be understood that the drilling operation can be performed by other drill rods, or a drill bit can be installed at the lower end of the double-liquid rotary jet grouting drill rod provided in the present application to perform the drilling operation.

[0061] S2, lowering the double-liquid rotary jet grouting drill pipe 100 to the designed depth position, and using a temporary protection structure to protect the slurry material nozzle 130, the high-pressure gas nozzle 140, and the quick-setting material nozzle 120 before lowering;

[0062] It is understandable that the temporary protection structure can be a cover body that is clamped on the slurry material nozzle 130, the high-pressure gas nozzle 140 and the quick-setting material nozzle 120, which is used to temporarily cover the nozzle. When the nozzle applies pressure to the cover body, the cover body can be opened.

[0063] S3. First, high-pressure gas is delivered to the high-pressure gas nozzle 140 to blow off the temporary protective structures on the slurry material nozzle 130 and the high-pressure gas nozzle 140, and quick-setting material is delivered to the quick-setting material nozzle 120 to flush off the temporary protective structure on the quick-setting material nozzle 120. Then, the delivery amount of the quick-setting material is reduced, and the high-pressure gas is continuously delivered. The double-liquid rotary jet grouting drill rod 100 is rotated, and the slurry material is started to be delivered after one rotation, and the delivery amount of the quick-setting material is increased to the designed value. The slurry material nozzle 130 sprays the slurry material to the pile boundary, and the high-pressure gas nozzle 140 forms a high-pressure airflow around the slurry material path. In this way, the high-pressure gas can provide assistance to the injection of the slurry material, reduce the influence of gravity on the slurry material, and ensure the accuracy of the injection position of the slurry material.

[0064] S4, the quick-setting material nozzle 120 sprays the quick-setting material to the pile boundary and mixes it with the slurry material. By setting the quick-setting material nozzle 120 and the slurry material nozzle 130 whose spray paths intersect at the pile boundary, the slurry material sprayed to the pile boundary can be quickly solidified, the amount of slurry leakage is reduced, the influence of cracks on grouting is reduced, and the uneven reinforcement effect is improved.

[0065] S5, when the injection flow and pressure of the slurry material nozzle 130, the high-pressure gas nozzle 140, and the quick-setting material nozzle 120 all reach the designed values, the double-liquid rotary jet grouting drill pipe 100 is lifted upward;

[0066] S6. After the construction is completed, the delivery of high-pressure gas is stopped first, and then the delivery of slurry material and quick-setting material is stopped, and the quick-setting material nozzle 120, the slurry material nozzle 130 and the high-pressure gas nozzle 140 are closed.

[0067] In some embodiments of the present application, the double-liquid rotary jet grouting construction method may also include lowering the double-liquid rotary jet grouting drill rod 100 to the designed depth position again when the double-liquid rotary jet grouting drill rod 100 rises to the first height, and lifting the double-liquid rotary jet grouting drill rod 100 upward again; in this way, it can be ensured that the grouting of the pile hole portion from the designed depth position to the first height position is more uniform, thereby improving the overall grouting effect.

[0068] The first height is greater than or equal to 0.5 m and less than or equal to 1.5 m. Specifically, it can be selected according to the diameter of the pile hole. In a specific implementation process, the first height can be 0.5 m, 0.8 m, 1.1 m or 1.5 m.

[0069] In some embodiments of the present application, the double-liquid rotary jet grouting construction method may also include: during the lifting process of the double-liquid rotary jet grouting drill rod 100, when the formation changes, adjusting the injection pressure of the quick-setting material nozzle 120, the slurry material nozzle 130 and the high-pressure gas nozzle 140.

[0070] It should be noted that before the construction work, it is necessary to conduct a terrain survey to obtain different stratum structures corresponding to different heights. It is understandable that different stratum structures have different structural properties, and the injection pressure of the quick-setting material nozzle 120, the slurry material nozzle 130 and the high-pressure gas nozzle 140 is adjusted to adapt to the structural properties of different stratum structures, thereby improving the overall grouting effect.

[0071] It should be noted that for the quick-setting material nozzle 120, the slurry material nozzle 130 and the high-pressure gas nozzle 140, in the process of double-liquid rotary grouting under the drill rod, in order to prevent the nozzle from being blocked by dust or impurities in the pile hole, it is necessary to add a protective film at the nozzle. When the quick-setting material nozzle 120, the slurry material nozzle 130 and the high-pressure gas nozzle 140 are operating, the protective film can be flushed open by the sputtering pressure of the nozzle to achieve normal operation of the nozzle.

[0072] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "center", "up", "down", "front", "back", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0073] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0074] In the description of the embodiments of the present invention, the term "and / or" refers to and covers any and all possible combinations of one or more of the associated listed items. The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0075] In the description of the embodiments of the present invention, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0076] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A double-liquid rotary jet grouting drill pipe, characterized in that: include: A drill rod body, the drill rod body is rotatably connected to the jet-jet drilling rig, and the drill rod body can rotate along its central axis; A quick-setting material nozzle, the quick-setting material nozzle is installed on the circumferential side wall of the drill rod body, and the quick-setting material nozzle is used to spray quick-setting material toward the pile boundary; A slurry material nozzle, which is installed on the circumferential side wall of the drill rod body, and is used to spray slurry material toward the pile boundary. In the axial direction of the drill rod body, the slurry material nozzle is located on the side of the quick-setting material away from the jet-jet drilling rig; Wherein, the injection path of the quick-setting material nozzle and the injection path of the slurry material nozzle intersect at the pile boundary.

2. The double-liquid rotary jet grouting drill pipe according to claim 1 is characterized in that: Also includes: A high-pressure gas nozzle is used to spray high-pressure gas toward the pile boundary. The high-pressure gas nozzle is installed on the circumferential side wall of the drill pipe body, and the distance between the high-pressure gas nozzle and the slurry material nozzle is smaller than the distance between the high-pressure gas nozzle and the quick-setting material nozzle.

3. The double-liquid rotary jet grouting drill pipe according to claim 1 is characterized in that: The spraying path of the slurry material nozzle is perpendicular to the pile boundary.

4. The double-liquid rotary jet grouting drill pipe according to claim 3 is characterized in that: The angle between the injection path of the quick-setting material nozzle and the pile boundary is a first angle, and the first angle is greater than or equal to 60° and less than or equal to 80°.

5. The double-liquid rotary jet grouting drill pipe according to claim 1, characterized in that: The distance between the grouting material nozzle and the quick-setting material nozzle is a first distance, and the first distance is greater than or equal to 15 cm and less than or equal to 20 cm.

6. The double-liquid rotary jet grouting drill pipe according to claim 2, characterized in that: Also includes: A high-pressure gas pipe is passed through the drill pipe body and is connected to the high-pressure gas nozzle.

7. The double-liquid rotary jet grouting drill pipe according to claim 6, characterized in that: Oxygen is introduced into the high-pressure gas pipe.

8. A double-liquid rotary jet grouting construction method, characterized in that: The double-liquid rotary jet grouting construction method is applied to a double-liquid rotary jet grouting drill rod, and the double-liquid rotary jet grouting drill rod comprises: A drill rod body, the drill rod body is rotatably connected to the jet-jet drilling rig, and the drill rod body can rotate along its central axis; A quick-setting material nozzle, the quick-setting material nozzle is installed on the circumferential side wall of the drill rod body, and the quick-setting material nozzle is used to spray quick-setting material toward the pile boundary; A slurry material nozzle, which is installed on the circumferential side wall of the drill rod body, and is used to spray slurry material toward the pile boundary. In the axial direction of the drill rod body, the slurry material nozzle is located on the side of the quick-setting material away from the jet-jet drilling rig; wherein the jet path of the quick-setting material nozzle intersects with the jet path of the slurry material nozzle at the pile boundary; A high-pressure gas nozzle, the high-pressure gas nozzle is used to spray high-pressure gas toward the pile boundary, the high-pressure gas nozzle is installed on the circumferential side wall of the drill pipe body, and the distance between the high-pressure gas nozzle and the slurry material nozzle is smaller than the distance between the high-pressure gas nozzle and the quick-setting material nozzle; The construction method comprises: S1. Drilling a hole to the designed depth on the ground to be constructed to form a pile hole; S2, lowering the double-liquid rotary jet grouting drill pipe to the designed depth position, and using a temporary protection structure to protect the slurry material nozzle, the high-pressure gas nozzle, and the quick-setting material nozzle before lowering; S3, firstly, conveying high-pressure gas to the high-pressure gas nozzle to blow off the temporary protective structure on the slurry material nozzle and the high-pressure gas nozzle, conveying quick-setting material to the quick-setting material nozzle to flush off the temporary protective structure on the quick-setting material nozzle, then reducing the conveying amount of quick-setting material, continuously conveying high-pressure gas, rotating the double-liquid rotary jet grouting drill rod, and starting to convey slurry material after one rotation, and increasing the conveying amount of quick-setting material to the designed value, the slurry material nozzle sprays slurry material to the pile boundary, and the high-pressure gas nozzle forms a high-pressure airflow around the slurry material path; S4, the quick-setting material nozzle sprays quick-setting material toward the pile boundary to mix with the slurry material; S5, when the injection flow and pressure of the slurry material nozzle, the high-pressure gas nozzle, and the quick-setting material nozzle all reach the designed values, the double-liquid rotary jet grouting drill pipe is lifted upward; S6. After the construction is completed, stop delivering high-pressure gas first, and then stop delivering slurry materials and quick-setting materials.

9. The double-liquid rotary jet grouting construction method according to claim 8, characterized in that: When the double-liquid rotary jet grouting drill rod rises to the first height, the double-liquid rotary jet grouting drill rod is lowered to the designed depth position again, and the double-liquid rotary jet grouting drill rod is lifted upward again.

10. The double-liquid rotary jet grouting construction method according to claim 8, characterized in that: Also includes: During the lifting process of the double-liquid rotary jet grouting drill rod, when the formation changes, the injection pressures of the quick-setting material nozzle, the slurry material nozzle and the high-pressure gas nozzle are adjusted.

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