Capsule-like body for quick grouting of voids in horizontal directional drilling technology and method of use thereof

Abstract

The application belongs to the technical field of engineering construction, and provides a capsule-like body for quickly grouting gaps in horizontal directional drilling technology and an application method thereof. The capsule-like body comprises a shell, a diaphragm, and a coated grouting material. The lower bottom surface of the shell is tightly attached to the outer wall of a pipeline to be laid. The upper part of the shell is outwardly convex, and a cavity is formed in the middle. The diaphragm is arranged in the cavity, and the cavity is divided into an A cavity and a B cavity. X material is injected into the A cavity, and Y material is injected into the B cavity. The shell and the diaphragm slowly and uniformly dissolve after being contacted with water. The shell, the diaphragm, and the grouting material do not have physical or chemical reactions. The X material and the Y material react and foam and expand after being contacted with water, and are not decomposed after being contacted with water. The pipeline is laid, and then grouting is performed on the gaps. After grouting, ground subsidence and pipeline damage due to geological action can be prevented. The capsule-like body expands and diffuses, wraps the pipeline, and plays a role in protecting and buffering the pipeline. The capsule-like body plays a role in filling gaps, reinforcing soil, preventing collapse, and fixing and protecting the pipeline.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of engineering construction, and particularly relates to a capsule-like body for a horizontal directional drilling technology rapid grouting gap and an application method thereof. BACKGROUND

[0002] With the continuous improvement of China's national economy and the continuous development of urbanization, in the pipeline crossing engineering, the past crossing rivers, valleys, highways and the like mostly adopt the crossing, large excavation and tunnel crossing mode, which is neither economic nor has a long construction period and greatly influences the surrounding natural environment landscape, therefore, the traditional excavation mode cannot meet the needs of urban development. In view of the current situation, the horizontal directional drilling technology is adopted in the pipeline crossing engineering, so as to effectively solve the problems in the pipeline crossing engineering. Through practical demonstration, the horizontal directional drilling crossing construction technology adopts the non-excavation operation mode, is suitable for laying various pipelines such as petroleum pipelines, communication and power pipelines, natural gas pipelines, tap water pipelines and the like through highways, railways, buildings, airports, rivers, lakes, mountains and the like, and is suitable for clay, silt soil, mud flow layer, general weathered rock and a small amount of gravel stratum in terms of soil quality. The horizontal directional drilling technology has the advantages of high success rate, short construction period, high economic benefit and good social benefit. The horizontal directional drilling technology has safety and reliability, and the generated social and economic benefits are very obvious, therefore, the horizontal directional drilling technology will be more widely popularized and used in the pipeline crossing engineering.

[0003] The horizontal directional drilling system is composed of a drilling rig system, a power system, a control system and a mud system. The drilling rig system is the main body of the crossing equipment drilling operation and the back dragging operation, and the components of the drilling rig system include a drilling rig main machine, a rotary table and the like, which mainly completes the drilling operation and the back dragging operation by placing the drilling rig main machine on the drilling rig frame, so as to meet the requirements in different operation states. The components of the power system include a hydraulic power source and a generator, and the main function of the power system is to provide hydraulic oil for the drilling rig system, and to use the hydraulic oil as the power of the drilling rig, so as to ensure the normal operation of the drilling rig system. The main function of the control system is to control the specific position of the drill bit underground, so as to correctly guide the drill bit to drill, and the control system is essential in the horizontal drilling technology, because it can ensure that the drill bit drills according to the designed curve. The main function of the mud system is to provide mud suitable for the drilling operation condition for the drilling rig system, and the mud is closely related to the back dragging of the drill.

[0004] However, the existing horizontal directional drilling technology has the following disadvantages: after the underground horizontal directional drilling technology is constructed, the drill bit diameter is larger than the pipeline diameter, resulting in a certain gap between the pipeline and the soil, thereby causing soil collapse, ground subsidence, and even causing upper river infiltration or affecting the upper buildings and industrial facilities; due to the long crossing span of the horizontal directional drilling, the gap is small, so that the conventional grouting process technology cannot effectively fill the gap generated after the horizontal directional drilling, and therefore, the gap cannot be overcome by using the existing technology; and the use of the grouting technology to fill the gap by expanding the drill hole diameter often brings greater time and material costs, and therefore, this method is not desirable. SUMMARY

[0005] In order to solve the problems in the prior art, the application provides a capsule for filling the gap of horizontal directional drilling technology and an application method thereof.

[0006] In order to achieve the above-mentioned purpose, the application adopts the following technical scheme: a grouting capsule for filling the gap of horizontal directional drilling technology, the grouting capsule comprising a shell, a diaphragm, and a coated grouting material, the lower bottom surface of the shell being in close contact with the outer wall of the pipeline to be laid, the front end of the shell being narrow, corresponding to the advancing direction of the pipeline laying, the rear end of the shell being blunt, the upper part of the shell being outwardly convex, forming a cavity in the middle, the diaphragm being arranged in the cavity, dividing the cavity into A cavity and B cavity, X material being injected into the A cavity, and Y material being injected into the B cavity; the shell and the diaphragm slowly and uniformly dissolve after being contacted with water; the shell, the diaphragm, and the grouting material do not have physical or chemical reactions; the X material and the Y material react and foam and expand after being contacted with water, and do not decompose after being contacted with water.

[0007] The thickness H of the grouting capsule is calculated based on the following formula: ; wherein H is the thickness of the capsule, t1 is the construction time of the pipeline laying, t2 is the time of the grouting material mixed to fill the gap, and v is the dissolution speed of the capsule in water or mud.

[0008] The mass m of the X and Y materials of the two components of the grouting material contained in a single grouting capsule X , m Y is calculated based on the following formula:

[0009] ;

[0010] wherein, m X is the mass of the X material required for a single capsule, m Y is the mass of the Y material required for a single capsule, n is the number of capsules, S is the expansion coefficient of the grouting material, p X is the density of the required X material, and p Ywherein, ρx is the density of the required X material, ρy is the density of the required Y material, β is an empirical coefficient, L is the total length of the pipeline, V1 is the volume of the gap between the drill hole and the pipeline, R is the final radius of the drill hole, r is the outer diameter of the pipeline, V2 is the volume that can be filled by the grouting material, n is the number of capsules required, S is the expansion coefficient of the grouting material, and L is the total length of the pipeline.

[0011] The capsules are arranged at intervals on the outer wall of the pipeline, and the distance between the two types of capsules is The distance between the two types of capsules is calculated based on the following formula: ; wherein The distance between the two types of capsules is calculated based on the following formula: X The mass of the required X material for a single capsule is m Y The mass of the required Y material for a single capsule is ρ X The density of the required X material is ρx Y The density of the required Y material is ρy, S is the expansion coefficient of the grouting material, L is the total length of the pipeline, n is the number of capsules required, R is the final radius of the drill hole, and r is the outer diameter of the pipeline.

[0012] The outer shell of the capsule extends outward to form a fixed portion.

[0013] The outer shell and the membrane are any one of gelatin, gel, cellulose, or polysaccharide; the shape of the capsule shell is any one of streamlined, water droplet, oval, triangle, circle, or annulus; the X material and the Y material are any one of chemical foaming and expanding organic material or expanding inorganic material.

[0014] When the X material and the Y material are chemical foaming and expanding organic material, the X material is polyether polyol or polyester polyol and other additives, and the Y material is isocyanate.

[0015] Further, the X material is a mixture of polyester polyol and polyether polyol and catalyst, crosslinking agent, foaming agent, and the Y material is 4-4'-diphenyl methane diisocyanate, which is mixed according to the following mass fraction: polyester polyol 100-120 parts, polyether polyol 50-70 parts, catalyst 5-8 parts, crosslinking agent 3-6 parts, and foaming agent 12-18 parts.

[0016] Further, the polyester polyol is PEA-1000, the polyether polyol is polytetrahydrofuran, the catalyst is any one of N,N-dimethylcyclohexylamine or triethylenediamine or a mixture thereof in any proportion, the crosslinking agent is any one of ethylene glycol EG, glycerol, trimethylolpropane, or 1,4-butanediol, and the foaming agent is any one of water, hydrochlorofluorocarbon, or alkane.

[0017] When the X material and the Y material are expanding inorganic material, the X material is cement powder, and the Y material is expanding agent and other additives.

[0018] The bottom of the grouting capsule shell is adhered to the outer wall of the pipeline by an adhesive.

[0019] The adhesive is any one of 309 glue, alpha-cyanoacrylate, U light-cured glue, hot melt glue, solvent glue or epoxy glue.

[0020] The application of the grouting capsule in the fast filling of gaps in horizontal directional drilling technology is specifically as follows:

[0021] (1) According to the designed drilling trajectory, a small-diameter pilot hole is drilled first, and then a large-diameter drill bit is connected to the end of the drill rod for multiple reaming;

[0022] (2) A plurality of grouting capsules are adhered to the pipeline to be laid at intervals above the pipeline, wherein the X and Y materials filled with grouting materials; after the last reaming, the pipeline to be laid is pulled into the designated position in the drill hole, and the grouting capsule is dissolved;

[0023] (3) After the grouting liquid is solidified, the pipeline construction is completed.

[0024] The grouting capsule prepared in the application can dissolve and release X and Y materials by itself after being soaked in water for a period of time. X and Y materials react and expand after meeting, and the grouting effect is achieved through foaming. After expansion, it has certain strength and water resistance, and plays a supporting role to soil and rock. A certain amount of water is needed as an auxiliary agent during the mixing reaction of X and Y materials, and the materials do not decompose when meeting water. The grouting components need to be dried.

[0025] After the installation of the capsule and the filling of the components, the pipeline construction is started. Within a period of time after the pipeline construction is completed, the A and B chambers are dissolved, the X and Y components are released and mixed to foam, and the grouting operation is completed. Thus, the functions of filling gaps, reinforcing soil, preventing collapse, fixing and protecting the pipeline are achieved.

[0026] Compared with the prior art, the following advantages are achieved: by arranging a plurality of capsules on the outer wall of the pipeline to be laid, grouting of the gaps after pipeline laying can be achieved; after grouting, ground subsidence and pipeline damage due to geological action can be prevented; the capsule components expand and diffuse to wrap the pipeline, thereby playing a role in protecting and buffering the pipeline. Moreover, the engineering cost is relatively low, and it does not cause any damage to traffic and the ground environment; it is beneficial to reduce the risk of pipeline rupture in the later period, improve the service life of the pipeline line, and reduce the number of maintenance. The application solves the problem of gap filling after pipeline drilling by filling the capsule with grouting materials, grouting the cracks generated by drilling and the gap between the pipeline and the hole. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the horizontal directional drilling construction in the application;

[0028] Figure 2The constructional schematic diagram of the present application;

[0029] Figure 3 The placement diagram of the soluble capsule in the present application;

[0030] Figure 4 The structure perspective schematic diagram of the soluble capsule in the present application;

[0031] Figure 5 The sectional view of the soluble capsule in the present application; A is the main sectional view; B is the left view; C is the top view; D is the three-dimensional model diagram;

[0032] In the figure: 1-grouting capsule; 2-the lower bottom surface of the shell; 3-pipe; 4-pipe laying forward direction; 5-the rear end of the shell; 6-the upper part of the shell; 7-the front end of the shell; 8-fixing part; 9-septum; 10-A cavity; 11-B cavity. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The materials, methods, and examples provided herein are illustrative only and are not intended to be limiting.

[0035] Equivalent techniques that are already known to those skilled in the art of the field of the application are deemed to be within the scope of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The materials, methods, and examples provided herein are illustrative only and are not intended to be limiting.

[0037] As Figures 3-5As shown, a grouting capsule for fast filling of voids in horizontal directional drilling technology, the grouting capsule 1 comprises a shell, a diaphragm 9, and a coated grouting material, the lower bottom surface 2 of the shell is in close contact with the outer wall of the pipeline 3 to be laid, the front end 7 of the shell is narrow, corresponding to the advancing direction 4 of pipeline laying, the rear end 5 of the shell is blunt, the upper part 6 of the shell is outwardly convex, forming a cavity, the diaphragm 9 is arranged in the cavity, dividing the cavity into A cavity 10 and B cavity 11, X material is injected into the A cavity 10, and Y material is injected into the B cavity 11; the shell and the diaphragm slowly and uniformly dissolve after being contacted with water; the shell, the diaphragm 9 and the grouting material do not have physical or chemical reactions; the X material and the Y material react and foam and expand after being contacted with water, and do not decompose when being contacted with water.

[0038] The thickness H of the capsule is calculated based on the following formula: ; wherein H is the thickness of the capsule, t1 is the construction time of pipeline laying, is the time of filling the voids by mixing the grouting material, and v is the dissolution speed of the capsule in water or mud;

[0039] The mass m of the two components X and Y of the grouting material contained in a single grouting capsule X , m Y is calculated based on the following formula:

[0040] ;

[0041] wherein m X is the mass of the required X material for a single capsule, m Y is the mass of the required Y material for a single capsule, n is the number of capsules, S is the expansion coefficient of the grouting material, p X is the density of the required X material, p Y is the density of the required Y material, and b is an empirical coefficient;

[0042] The capsules are arranged at intervals on the outer wall of the pipeline, and the distance d between two capsules is calculated based on the following formula: ; wherein is the distance between two capsules, m X is the mass of the required X material for a single capsule, m Y is the mass of the required Y material for a single capsule, p X is the density of the required X material, p Y is the density of the required Y material, S is the expansion coefficient of the grouting material, L is the total length of the pipeline, n is the number of capsules required to be arranged, R is the final radius of the borehole, and r is the outer diameter of the pipeline.

[0043] The capsule shell in the present application adopts a near streamline shape and has a certain structure, and the purpose is to maintain a certain strength, not to be broken by extrusion, not to be damaged due to friction, and to reduce the friction coefficient as much as possible to facilitate pipeline back dragging; the shell material will slowly dissolve when meeting water or mud, and release the grouting material therein.

[0044] The horizontal directional drilling environment is intended to adapt to different soil environments, different construction methods, different grouting requirements, and objective conditions such as crossing distance; and the purpose is to facilitate construction, reinforce soil, fill voids, fix pipelines, and prevent the overburden of the laid pipeline and the adjacent building from sinking, collapsing or rising.

[0045] The bottom of the capsule-like object is bonded to the pipeline to be laid by an adhesive, wherein the curvature of the lower bottom surface of the capsule-like object is the same as the curvature of the pipeline to be laid, and can be tightly attached to the pipeline, and the bonding strength will not fail with the increase of the friction between the pipeline and the soil, and then fall off.

[0046] The material of the capsule-like object does not react (including physical and chemical reactions) with the X, Y materials and additives of the polyurethane grouting material, and can contain enough grouting material, and there is a separation device in the capsule-like object, separating the X and Y materials.

[0047] The materials in the capsule-like object have the following common properties: two components react and expand after meeting; after expansion, it has a certain strength and water resistance, and supports soil and rock; a certain amount of water is required as an additive when X and Y materials are mixed and reacted, and does not decompose when meeting water. The grouting components need to be dried.

[0048] After reaming is completed, before the pipeline to be laid, enough capsules are installed on the upper part of the pipeline, and different dissolution times are set, which are used for different construction requirements, and the grouting material will not damage and destroy the pipeline.

[0049] The shell and the diaphragm are any one of gelatin, gel, cellulose or polysaccharide; the X material and the Y material are any one of chemical foaming and expanding organic material or expanding inorganic material.

[0050] Example 1: Application of grouting capsule in horizontal directional drilling technology for rapid filling of voids, the grouting capsule prepared by the above method includes a capsule shell, an A cavity, a B cavity and a capsule base.

[0051] The construction site belongs to pipeline crossing river project, the design horizontal directional drilling track length is 560m, the crossing into the soil angle is 10°, the out of the soil angle is 10°, the deepest point is located at the river bottom 8m, the pipe outer diameter is Φ354mm, the crossing soil is silt layer silty clay layer, horizontal directional drilling is used to lay the pipeline, the prepared grouting capsule of the application is arranged on the pipeline, the capsule material is gelatin, the capsule thickness is measured by ground experiment and is 3mm, the capsule loading X material is polyester polyol, polyethylene glycol, sodium dodecyl benzene sulfonate, γ-aminopropyl triethoxysilane mixed material with mass ratio of 100:1:0.5:0.5, Y material is isocyanate, the capsule laying arrangement is calculated according to the formula, 5 per meter, the single capsule loading is mX X material and mX Y material, and the construction is carried out according to the construction steps, which includes the following steps:

[0052] (1) the drilling machine is placed according to the design position, the direction is adjusted to face the out of the soil position, the drilling machine is fixed, and the anchor pile is installed. A working pit with a length of 8m, a width of 6m and a depth of 2m mud pool is dug in front of the drilling machine.

[0053] (2) the guide hole construction is the most critical link in the whole crossing process. Anti-interference instrument is used to realize directional drilling with the guide drill bit, the position of the drill bit is measured and calculated, the drill bit level is monitored in real time within 0~2°, and the drill bit is ensured to rotate horizontally without lifting upward during the drilling process.

[0054] (3) after the guide hole is completed, the back expansion drill bit is replaced to carry out reverse drilling until the specified size is reached. The physical and chemical properties of the mud are improved to ensure the stability of the drilling hole during the expansion process, and a protective film is formed on the wall of the drilling hole to ensure good wall protection performance.

[0055] (4) after the pipeline is completed welding, the residual slag and dust are cleaned, one grouting capsule is adhered to every 5m with adhesive, and compaction operation is carried out to ensure that the capsule is firmly fixed.

[0056] (5) then, the pipeline back dragging operation is carried out, that is, the drill rod and the pipe are bound together with the joint, then the drilling machine pipe is opened, and the back dragging is carried out. According to the back dragging speed, qualified mud is injected into the drilling hole through the drilling machine mud system to ensure the stability of the hole after the pipeline back dragging to prevent the subgrade from collapsing. The pipeline laying is completed, after a certain period of time, the grouting capsule slowly dissolves after meeting water, releases X and Y materials, mixes and completes grouting.

[0057] (6) during the grouting process, real-time monitoring is carried out to prevent slurry running, especially to prevent ground subsidence, uplift and overflow accidents. After the grouting liquid completely solidifies to form stone body, and the protection of the pipeline is completed, the annular pore is filled and a certain stress is ensured, the construction is completed.

[0058] The final real-time monitoring result shows that the grouting capsule is broken and the grouting material is released ten minutes after the pipeline back dragging, and the grouting material completely solidifies after 30 minutes. At this time, the grouting material completes the filling of the annular pore. After 2 hours after the grouting is completed, there is no grouting overflow phenomenon on the ground. Five days after the construction is completed, the overburden soil layer and the adjacent building of the laid pipeline do not appear the phenomena of subsidence, collapse or uplift. It is proved that the grouting and filling effect of the capsule grouting device and the grouting method is good.

[0059] In step (4), the grouting capsule can be changed in size, shape, thickness, bonding method and distance according to the actual situation of the construction environment and construction requirements. The polyurethane grouting slurry in step (5) can be replaced according to the actual situation of the site grouting.

[0060] In this embodiment, the grouting capsule is adhered to the outside of the pipeline by adhesion, and no rupture due to extrusion occurs during the construction process. The thickness of the capsule is appropriate, which ensures the smooth progress of the construction. The polyurethane grouting material used is suitable for the mud environment in the pipeline, and the grouting effect is good in this construction, and there is no phenomenon of ground subsidence, collapse or uplift.

[0061] Example 2: In this example, a drilling platform simulating horizontal directional drilling is set up in an outdoor laboratory. 1000 kg of soil is dried and compacted, and 150 kg of water is added to construct a simulated soil with a humidity of 15%. The simulated pipeline pressure is 3 MPa, the simulated pipeline outer diameter is 100 mm, and the simulated pipeline length is 5 m. The grouting capsule and construction method of this experiment are used for construction, and the specific steps are as follows:

[0062] (1) Place according to the designed position, adjust the direction to face the soil removal position, and fix the drilling machine after installation of the anchor pile. A working pit with a length of 8 m, a width of 6 m and a depth of 2 m is excavated in front of the drilling machine.

[0063] (2) Construction is the most critical link in the whole crossing process. Anti-interference instruments are used to realize directional drilling with a guide drill bit, and the position of the drill bit is calculated and measured to ensure that the drill bit level is within 0~2° and the drill bit rotates horizontally without lifting upward.

[0064] (3) After the hole is drilled, the back expansion drill bit is replaced to perform reverse drilling until the specified size is reached. During the expansion process, the physical and chemical properties of the mud are improved to ensure the stability of the drilling. A protective film is formed on the drilling wall to ensure good wall protection performance.

[0065] (4) After the pipeline is welded, the residues and dust are cleaned, and a grouting capsule is adhered to the pipeline at certain intervals by using an adhesive, and compaction operation is performed to ensure that the capsule is firmly fixed.

[0066] (5) then the pipeline back-dragging operation is carried out, that is, the drill pipe and the pull tube are tied together by a joint, then the drill pipe is opened, the qualified mud is injected into the hole through the mud system of the drilling machine according to the back-dragging speed, the stability of the hole after the pipeline back-dragging is ensured, so as to prevent the subgrade from collapsing, the pipeline laying is completed, and after a certain period of time, the X and Y materials in the grouting capsule are released after the grouting capsule slowly dissolves in water, and the grouting is completed after mixing.

[0067] (6) During the grouting process, real-time monitoring should be carried out to prevent slurry running, especially to prevent accidents such as ground subsidence, uplift and slurry overflow. After the grouting liquid completely solidifies to form a stone body, and the pipeline is protected, the annular pore is filled and a certain stress is ensured, the construction is completed.

[0068] Among them, the control group experiment without using the grouting capsule of the application is simulated in the outdoor laboratory, the pipeline is subjected to the pull-out test and the pressure test after one day of construction, and it is found that the ungrouted pipeline is loose under the action of 500N, and the pipeline is loose under the action of 4000N; the ungrouted pipeline appears ground subsidence and collapse under the pressure of 1000N; but after grouting, the accident occurs after 1500N.

[0069] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A grouting capsule for quick grouting of voids in horizontal directional drilling technology, characterized in that: The grouting capsule (1) comprises a shell, a diaphragm (9), and a wrapped grouting material, the lower bottom (2) of the shell is attached to the outer wall of the pipeline (3) to be laid, the front end (7) of the shell is narrow, corresponding to the advancing direction (4) of the pipeline laying, the rear end (5) of the shell is blunt, the upper part (6) of the shell is outwardly convex, forming a cavity, the diaphragm (9) is arranged in the cavity, dividing the cavity into A cavity (10) and B cavity (11), X material is injected into the A cavity (10), and Y material is injected into the B cavity (11); the shell and the diaphragm are slowly and uniformly dissolved after being contacted with water; the shell, the diaphragm (9), and the grouting material do not have physical or chemical reaction; the X material and the Y material are mixed and react to foam and expand after being contacted with water, and are not decomposed after being contacted with water.

2. The grouting capsule for quick grouting of voids in horizontal directional drilling technology according to claim 1, characterized in that: The outwardly extending part of the capsule shell is provided with a fixing part (8).

3. The grouting capsule for quick grouting of voids in horizontal directional drilling technology according to claim 1, characterized in that: The shell and the diaphragm are any one of gelatin, gel, cellulose, and polysaccharide; the shape of the capsule shell is any one of streamline, water drop, ellipse, triangle, circle, and ring; the X material and the Y material are chemical foaming and expanding organic material or expanding inorganic material.

4. The grouting capsule for quick grouting of voids in horizontal directional drilling technology according to claim 3, characterized in that: The X material and the Y material are chemical foaming and expanding organic material, the X material is polyether polyol or polyester polyol and other additives, and the Y material is isocyanate.

5. The grouting capsule for quick grouting of voids in horizontal directional drilling technology according to claim 4, characterized in that: The X material is a mixture of polyester polyol and polyether polyol and catalyst, crosslinking agent, and foaming agent, and the Y material is 4,4'-diphenyl methane diisocyanate, which are mixed according to the following mass fraction: polyester polyol 100-120 parts, polyether polyol 50-70 parts, catalyst 5-8 parts, crosslinking agent 3-6 parts, and foaming agent 12-18 parts; the polyester polyol is PEA-1000, the polyether polyol is polytetrahydrofuran, the catalyst is any one of N,N-dimethylcyclohexylamine and triethylenediamine or a mixture thereof in any proportion, the crosslinking agent is any one of ethylene glycol EG, glycerol, trimethylolpropane, and 1,4-butanediol, and the foaming agent is any one of water, hydrogen chlorofluorocarbon, and alkane.

6. The grouting capsule for quick grouting of voids in horizontal directional drilling technology according to claim 3, characterized in that: The X material and the Y material are expanding inorganic material, the X material is cement powder, and the Y material is expanding agent and other additives.

7. The grouting capsule for quick grouting of voids in horizontal directional drilling technology according to claim 1, characterized in that: The bottom of the grouting capsule shell is bonded to the outer wall of the pipeline by an adhesive; the adhesive is any one of 309 glue, alpha-cyanoacrylate, U light-cured glue, hot melt glue, solvent glue, and epoxy glue.

8. Use of the grouting capsule according to claim 1 in the rapid grouting of voids in horizontal directional drilling technology, characterized in that: The specific method is: (1) according to the designed drilling trajectory, a small-diameter guide hole is drilled first, and then a large-diameter drill bit is connected to the end of the drill rod for multiple reaming; (2) a plurality of grouting capsules filled with X and Y materials are pasted on the pipeline to be laid at intervals, the pipeline to be laid is pulled into the designated position in the drill hole at the same time as the last reaming, and pipeline back-drawing operation is performed, that is, the drill rod and the pipe are bound together by a joint, then the drilling machine is started to pull the pipe, and qualified mud is injected into the drill hole through the mud system of the drilling machine according to the back-drawing speed, so as to ensure the stability of the hole after the pipeline back-drawing, prevent the roadbed from collapsing, and complete the pipeline laying, the grouting capsule slowly dissolves after being contacted with water, releases the X and Y materials, and completes the grouting after mixing; (3) the grouting liquid is solidified to complete the pipeline laying.

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