Grouting head assembly, method for using grouting head assembly, and road surface repair grouting process

Abstract

The application relates to the technical field of grouting equipment, in particular to a grouting head assembly, a using method of the grouting head assembly and a road surface repairing grouting process. The grouting head assembly comprises a grouting head body and an elastic expansion component; the elastic expansion component is arranged outside the grouting head body; the elastic expansion component has a hollow structure with a changeable internal volume; and the elastic expansion component is formed with an inlet end for connecting a pressure source. It can be seen that, as the elastic expansion component is additionally arranged outside the grouting head body, the inside of the elastic expansion component can be filled with hydraulic oil and the like, so that the elastic expansion component expands, a drill hole is blocked, the effect of preventing grout leakage is achieved, and the grouting head body is not prone to shaking, so that the grouting pressure is stable.

Description

Technical Field

[0001] The present application relates to the technical field of grouting equipment, and in particular to a grouting head assembly, a method for using the grouting head assembly, and a pavement repair grouting process. Background Art

[0002] At present, in order to reinforce the areas with serious voids at the transverse joints and joints of the road surface, grouting holes are often opened and drilled to the bottom of the cement concrete slab, and then grouting is injected into the grouting holes. However, during the grouting process, the slurry will spray out from the gap between the drill hole and the grouting head, resulting in waste of slurry. In addition, the grouting head shakes during operation, making the grouting pressure unstable. Summary of the Invention

[0003] The purpose of this application is to provide a grouting head assembly, a method for using a grouting head assembly, and a pavement repair grouting process, which to a certain extent solves the technical problems in the prior art that during the grouting process, slurry will spray out from the gap between the drill hole and the grouting head, resulting in waste of slurry. In addition, the grouting head shakes during operation, making the grouting pressure unstable.

[0004] The present application provides a grouting head assembly, comprising: a grouting head body and an elastic expansion member; wherein the elastic expansion member is arranged outside the grouting head body;

[0005] The elastic expansion member has a hollow structure with a variable internal volume;

[0006] The elastic expansion member is formed with an inlet end for connecting to a pressure source.

[0007] In the above technical solution, further, the elastic expansion member is an elastic tube, and the elastic tube is wound around the outside of the grouting head body, one end of the elastic tube is formed as the inlet end, and the other opposite end of the elastic expansion member is formed as a closed end.

[0008] In any of the above technical solutions, further, the elastic expansion member has a ring structure, and is sleeved on the outside of the grouting head body.

[0009] In any of the above technical solutions, further, the elastic expansion member is bonded to the outside of the grouting head body.

[0010] In any of the above technical solutions, further, the grouting head assembly also includes a fixing ring, which is sleeved on the outside of the grouting head body, and part of the elastic expansion member is pressed between the fixing ring and the grouting head body.

[0011] In any of the above technical solutions, further, the grouting head body includes a supporting pipe, a grouting pipe and a grouting head connected to the grouting pipe;

[0012] Wherein, the grouting pipe is arranged inside the supporting pipe, and the grouting pipe is rotatably connected to the supporting pipe, and the grouting head can extend out of the supporting pipe;

[0013] The elastic expansion member is arranged outside the supporting pipe.

[0014] In any of the above technical solutions, further, the grouting pipe is threadedly connected to the supporting pipe.

[0015] In any of the above technical solutions, further, the grouting head assembly further includes an elastic ring and a support rod; wherein the elastic ring is sleeved on the outside of the support pipe and connected to the support pipe;

[0016] One end of the support rod is fixedly connected to the grouting head, and the other opposite end of the support rod is inserted into an installation space formed by the elastic ring and the outer wall surface of the support rod.

[0017] In any of the above technical solutions, further, there are multiple support rods, and the multiple support rods are evenly spaced around the circumference of the grouting head.

[0018] In any of the above technical solutions, further, the grouting head assembly also includes a pressurizing device as the pressure source, and the pressurizing device is used to expand the elastic expansion member along the circumferential direction toward a direction away from the grouting head body.

[0019] The present application also provides a method for using a grouting head assembly, which is based on the grouting head assembly described in any of the above technical solutions and therefore has all the beneficial technical effects of the grouting head assembly, which will not be repeated here.

[0020] In the above technical solution, further, the method for using the grouting head assembly includes the following steps:

[0021] Inserting a portion of the support pipe of the grouting head body, a portion of the grouting pipe, and the grouting head together with the elastic expansion member into a drilled hole in a road surface, wherein the drilled hole in the road surface is deep enough to reach below a cement concrete slab, and the grouting head together with the support rod are all located below the cement concrete slab;

[0022] The grouting pipe is rotated and lifted, and the grouting pipe drives the grouting head and the support rod to move upward, and the support rod interferes with the support pipe and is forced to open with the grouting head as the center until the end of the support rod away from the grouting head abuts against the lower surface of the cement concrete slab, and pressure is applied to the elastic expansion member, so that the elastic expansion member expands and blocks the drilled hole in the road surface;

[0023] After grouting is completed in the drilled hole of the pavement through the grouting head body, the grouting pipe is moved downward, and the grouting pipe drives the grouting head and the support rod to move downward. Under the pressure of the elastic ring, the support rod gradually approaches the support pipe and is stored. At this time, the end of the support rod away from the grouting head is also separated from the lower surface of the cement concrete slab, and the pressure in the elastic expansion member is released, and the grouting head assembly is taken out from the drilled hole of the pavement.

[0024] The present application also provides a pavement repair grouting process, which is based on the grouting head assembly described in any of the above technical solutions and therefore has all the beneficial technical effects of the grouting head assembly, which will not be repeated here.

[0025] In the above technical solution, further, the pavement repair grouting process includes the following steps:

[0026] Pavement drilling: Drill holes in the pavement according to the grouting hole layout plan, with the hole depth reaching below the cement concrete slab;

[0027] Prepare cement slurry: prepare cement, water, expansion agent and high-efficiency water reducer into cement slurry according to the preset ratio;

[0028] Arranging the grouting head assembly: extending a portion of the support pipe structure of the grouting head body, a portion of the grouting pipe structure, the grouting head, and the elastic expansion member into a drilled hole in a road surface, wherein the drilled hole in the road surface is deep enough to be below a cement concrete slab, and the grouting head and the support rod are all located below the cement concrete slab;

[0029] The grouting pipe is rotated and lifted, and the grouting pipe drives the grouting head and the support rod to move upward, and the support rod interferes with the support pipe and is forced to open with the grouting head as the center until the end of the support rod away from the grouting head abuts against the lower surface of the cement concrete slab, and pressure is applied to the elastic expansion member, so that the elastic expansion member expands and blocks the drilled hole in the road surface;

[0030] Grouting operation: injecting the prepared cement slurry into the grouting pipe;

[0031] Removing the grouting head assembly: After the grouting is completed, move the grouting pipe downward, and the grouting pipe drives the grouting head and the support rod to move downward. Under the pressure of the elastic ring, the support rod gradually approaches the support pipe and is stored. At this time, the end of the support rod away from the grouting head is also separated from the lower surface of the cement concrete slab, and the pressure in the elastic expansion member is released, and the grouting head assembly is taken out from the drilled hole in the road surface.

[0032] In the above technical solution, further, the grouting operation includes the following steps: under the condition that the pressure between the elastic expansion member and the hole wall reaches 3 MPa after expansion, the prepared cement slurry is injected into the grouting pipe by using a pulse cement grouting machine, and then the grouting is stopped when the maximum pressure of the grouting after pressure stabilization reaches a preset pressure, and when the maximum pressure of the grouting after pressure stabilization still does not reach the preset pressure, the grouting is stopped when overflow occurs in the adjacent borehole;

[0033] Among them, the pressure during normal grouting is 0.4~0.8Mpa, the pressure of maximum pressure grouting is controlled at 1.2Mpa, and the opening of the slurry valve during grouting is set to 50%~60%.

[0034] In any of the above technical solutions, further, in the grouting hole layout scheme, a square area covering the area to be repaired is set, and the square area includes a first lane square area and / or a second lane square area, the first lane square area is adapted to the cement concrete slab located therebelow, and the second lane square area is adapted to the cement concrete slab located therebelow;

[0035] The first lane square area has a five-hole arrangement, and the five drill holes in the first lane square area are respectively arranged at the four corners and the midpoint of the first lane square area;

[0036] The second lane square area is arranged with seven holes, and three of the seven drill holes in the second lane square area are evenly arranged on one side of the area to be repaired, the other three drill holes are evenly arranged on the other side opposite to the area to be repaired, and the last drill hole is arranged at the midpoint of the area to be repaired.

[0037] Compared with the prior art, the present invention has the following advantages:

[0038] In the grouting head assembly provided in the present application, an elastic expansion component is added to the outside of the grouting head body, and hydraulic oil or the like can be filled inside the grouting head to cause it to expand, thereby sealing the drill hole, thereby preventing leakage of grouting slurry and making the grouting head body less likely to shake, thereby ensuring stable grouting pressure.

[0039] The use method of the grouting head assembly provided by the application can guide the operator to use the grouting head assembly, is more standardized, and is helpful to improve the efficiency of repairing the road surface.

[0040] The road surface repairing grouting process provided by the application has a great guiding effect on repairing the road surface, and is helpful to improve the repairing quality and the repairing efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the application, the drawings needed to be used in the specific embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0042] Figure 1 The structural schematic diagram of the grouting head assembly provided by the embodiment of the application is shown in the figure.

[0043] Figure 2 The structural schematic diagram of the grouting head assembly provided by the embodiment of the application is shown in the figure.

[0044] Figure 3 The structural schematic diagram of the grouting head assembly provided by the embodiment of the application is shown in the figure.

[0045] Figure 4 The structural schematic diagram of the grouting head assembly provided by the embodiment of the application is shown in the figure.

[0046] Figure 5 The grouting hole layout scheme provided by the embodiment of the application is shown in the figure.

[0047] Reference signs:

[0048] 1-grouting head body, 101-support pipe, 102-grouting pipe, 103-grouting head, 2-elastic expansion member, 3-elastic ring, 4-support rod, 5-pressurizing device, 6-cement concrete slab, 7-first lane square area, 8-second lane square area, 9-drilling of road surface, 10-first lane, 11-second lane, 12-emergency lane. DETAILED DESCRIPTION

[0049] The technical solutions of the application will be described in detail below with reference to the drawings. Obviously, the described embodiments are some embodiments of the application, but not all the embodiments.

[0050] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the present application.

[0051] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0052] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, it may be directly “on,” “connected to,” “coupled to,” “over,” or “overlaying” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on,” “directly connected to,” “directly coupled to,” “directly over,” or “directly covering” another element, there may be no other elements intervening therebetween.

[0054] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0055] The terms used herein are intended only to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular is intended to include the plural. The terms "comprise," "include," and "have" list the presence of stated features, quantities, operations, components, elements, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0057] Refer to the following Figures 1 to 5 The present invention describes a grouting head assembly, a method for using the grouting head assembly, and a pavement repair grouting process according to some embodiments of the present application.

[0058] Example 1

[0059] See also Figures 1 to 3 As shown, an embodiment of the present application provides a grouting head assembly, comprising: a grouting head body 1 and an elastic expansion member 2; wherein the elastic expansion member 2 is arranged outside the grouting head body 1;

[0060] The elastic expansion member 2 has an internal hollow structure, and the volume of the internal hollow structure is variable;

[0061] The elastic expansion member 2 is formed with an inlet end to which a pressurizing device 5 (which is a pressure source) can be connected.

[0062] During use, the grouting head body 1 is connected to the slurry pipe, and the inlet end of the elastic expansion member 2 is connected to the pressure device 5 through a pipe fitting (for example, the pressure device 5 can be a hydraulic device, and the pressure device 5 will be used as an example of a hydraulic device in the following, but the pressure device 5 is not limited to hydraulic equipment. The pressure device 5 can also be an inflation and deflation device to fill gas into the elastic expansion member 2. Note that the pressure device 5 described here can be a component included in the grouting head assembly, or it may not belong to the grouting head assembly). The grouting head body 1 is placed in the borehole, and after hydraulic oil is injected into the elastic expansion member 2, the elastic expansion member 2 is expanded to block the borehole. The pressure gauge of the hydraulic device records the pressure in the elastic expansion member 2. The greater the pressure, the tighter the contact between the elastic expansion member 2 and the borehole, the better the sealing effect, and the less likely it is to leak slurry. In addition, the grouting head body 1 is not easy to shake, so that the grouting pressure is stable.

[0063] When the grouting is completed, the hydraulic oil can be extracted from the elastic expansion member 2 by hydraulic equipment, and the elastic expansion member 2 shrinks, making it easier to remove the grouting head body 1 from the drill hole.

[0064] It can be seen that since an elastic expansion component 2 is added to the outside of the grouting head body 1, its interior can be filled with hydraulic oil, etc. to make it expand, thereby sealing the drill hole, preventing grout leakage, and making the grouting head body 1 less likely to shake, ensuring stable grouting pressure.

[0065] In this embodiment, preferably, Figure 1 and Figure 2 As shown, the elastic expansion member 2 is an elastic tube, and the elastic tube is wound around the outside of the grouting head body 1 , one end of the elastic tube is formed as an inlet end, and the other end of the elastic expansion member 2 is formed as a closed end.

[0066] According to the structure described above, the elastic tube is wound around the outside of the grouting head body 1 and expands uniformly in the circumferential direction of the grouting head body 1, thereby improving the sealing effect.

[0067] Of course, it is not limited to this. Figure 3 As shown, the elastic expansion member 2 may also have an annular structure, and is sleeved on the outside of the grouting head body 1, and can still expand to seal the drilled hole.

[0068] In this embodiment, preferably, the elastic expansion member 2 is bonded to the outside of the grouting head body 1 , so that the elastic expansion member 2 and the grouting head body 1 form a stable connection.

[0069] Of course, it is not limited to adhesive fixation. The elastic expansion member 2 can also be fixed in the following way. The grouting head assembly also includes a fixing ring, which is sleeved on the outside of the grouting head body 1, and part of the elastic expansion member 2 is pressed between the fixing ring and the grouting head body 1.

[0070] In this embodiment, preferably, Figures 1 to 3 As shown, the grouting head body 1 includes a supporting pipe 101, a grouting pipe 102 and a grouting head 103 connected to the grouting pipe 102;

[0071] The grouting pipe 102 is arranged inside the support pipe 101 , and the grouting pipe 102 is rotatably connected to the support pipe 101 , and the grouting head 103 can extend out of the support pipe 101 ; the elastic expansion member 2 is arranged outside the support pipe 101 .

[0072] According to the structure described above, the grouting pipe 102 is used to connect the slurry inlet pipe to transport the slurry to the grouting head 103. The grouting head 103 performs the grouting operation, and the support pipe 101 plays the role of supporting the above-mentioned grouting pipe 102.

[0073] Among them, preferably, Figures 1 to 3 As shown, the grouting pipe 102 is threadedly connected to the support pipe 101, which is convenient for later disassembly, maintenance or replacement.

[0074] In this embodiment, preferably, Figures 1 to 4 As shown, the grouting head assembly further includes an elastic ring 3 and a support rod 4; wherein the elastic ring 3 is sleeved on the outside of the support pipe 101 and connected to the support pipe 101;

[0075] One end of the support rod 4 is fixedly connected to the grouting head 103 , and the other opposite end of the support rod 4 is inserted into the installation space formed by the elastic ring 3 and the outer wall surface of the support rod 4 .

[0076] According to the structure described above, when using the present grouting head assembly, the grouting pipe 102 is connected to the grouting pipe, the inlet end of the elastic expansion member 2 is connected to the pressure device 5 through the pipe, the support pipe 101 is placed in the drill hole, and after the hydraulic oil is injected into the elastic expansion member 2, the elastic expansion member 2 is expanded to block the drill hole, and then the grouting pipe 102 is rotated and lifted, and the grouting pipe 102 drives the grouting head 103 together with the support rod 4 to move upward, and the support pipe 101 interferes with the support rod 4, forcing the support rod 4 to open with the grouting head 103 as the center until the end of the support rod 4 away from the grouting head 103 abuts against the lower surface of the cement concrete slab 6, so that the grouting head body 1 is further fixed, thereby avoiding shaking during the grouting process, thereby ensuring the stability of the grouting pressure and improving the grouting efficiency. Of course, the operation is not limited to the above steps. The supporting rod 4 may be opened first to make it rest against the lower surface of the cement concrete slab 6, and then pressure is applied to the elastic expansion member 2 to expand it and seal the drilled hole.

[0077] When grouting is completed, the grouting pipe 102 can be moved downward, and the grouting pipe 102 drives the grouting head 103 and the support rod 4 to move downward. Under the pressure of the elastic ring 3, the support rod 4 gradually approaches the support pipe 101 and is stored. At this time, the end of the support rod 4 away from the grouting head 103 also separates from the lower surface of the cement concrete slab 6. Then or at the same time, the pressure of the elastic expansion member 2 is released, so that the elastic expansion member 2 contracts and the elastic expansion member 2 no longer blocks the grouting hole. Finally, the grouting head assembly can be successfully removed from the grouting hole.

[0078] It can be seen that the structural design of the support rod 4 and the elastic ring 3 plays a role in reinforcing the grouting head body 1, and plays a double insurance role on the basis of the elastic expansion member 2.

[0079] Optionally, the support rod 4 can be a stainless steel metal rod with high strength and corrosion resistance.

[0080] Among them, preferably, Figure 4 As shown, there are multiple support rods 4 , and the multiple support rods 4 are evenly spaced around the circumference of the grouting head 103 .

[0081] It can be seen from the structure described above that this structural arrangement enables the grouting head body 1 to be fixed more stably.

[0082] Example 2

[0083] This embodiment provides a method for using a grouting head assembly. Figures 1 to 4 As shown, the method for using the grouting head assembly includes the following steps:

[0084] Insert the support pipe 101 of the grouting head body 1, the support pipe 102, the grouting head 103 and the elastic expansion member 2 into the drilled hole 9 in the road surface. The drilled hole 9 in the road surface is deep enough to reach below the cement concrete slab 6, and the grouting head 103 and the support rod 4 are all located below the cement concrete slab 6.

[0085] The grouting pipe 102 is rotated and lifted, and the grouting pipe 102 drives the grouting head 103 and the support rod 4 to move upward. The support rod 4 interferes with the support pipe 101 and is forced to open with the grouting head 103 as the center until the end of the support rod 4 away from the grouting head 103 abuts against the lower surface of the cement concrete slab 6, and pressure is applied to the elastic expansion member 2, so that the elastic expansion member 2 expands and blocks the drilled hole 9 in the road surface;

[0086] After grouting is completed into the drill hole 9 in the road surface through the grouting head body 1, the grouting pipe 102 is moved downward, and the grouting pipe 102 drives the grouting head 103 and the support rod 4 to move downward. Under the pressure of the elastic ring 3, the support rod 4 gradually approaches the support pipe 101 and is stored. At this time, the end of the support rod 4 away from the grouting head 103 also detaches from the lower surface of the cement concrete slab 6, and the pressure in the elastic expansion member 2 is released, and the grouting head assembly is taken out from the drill hole 9 in the road surface.

[0087] The method for using the grouting head assembly provided in this application can guide the operator to use the grouting head assembly in a more standardized manner and help improve the efficiency of road repair.

[0088] Among them, the order of pressurizing the elastic expansion member 2 and opening the support rod 4 can be set according to actual needs, and the above operations can be performed simultaneously, but it should be noted that the elastic expansion member 2 should be pressurized first to fix the support tube 101, which is convenient for opening the support rod 4 later. This solution is better.

[0089] Example 3

[0090] This embodiment provides a road repair grouting process, see Figures 1 to 4 As shown, the pavement repair grouting process includes the following steps:

[0091] Pavement drilling: Drill holes on the pavement according to the grouting hole layout plan, with the hole depth reaching below the cement concrete slab 6;

[0092] Prepare cement slurry: prepare cement, water, expansion agent and high-efficiency water reducing agent into cement slurry according to the preset ratio;

[0093] Install the grouting head assembly: insert the support pipe 101 portion of the grouting head body 1, the grouting pipe 102 portion, and the grouting head 103 together with the elastic expansion member 2 into the drilled hole 9 in the road surface, wherein the drilled hole 9 in the road surface is deep enough to be below the cement concrete slab 6, and the grouting head 103 together with the support rod 4 are all located below the cement concrete slab 6;

[0094] The grouting pipe 102 is rotated and lifted, and the grouting pipe 102 drives the grouting head 103 and the support rod 4 to move upward. The support rod 4 interferes with the support pipe 101 and is forced to open with the grouting head 103 as the center until the end of the support rod 4 away from the grouting head 103 abuts against the lower surface of the cement concrete slab 6, and pressure is applied to the elastic expansion member 2, so that the elastic expansion member 2 expands and blocks the drilled hole 9 in the road surface;

[0095] Grouting operation: injecting the prepared cement slurry into the grouting pipe 102;

[0096] Remove the grouting head assembly: After the grouting is completed, move the grouting pipe 102 downward, and the grouting pipe 102 drives the grouting head 103 and the support rod 4 to move downward. Under the pressure of the elastic ring 3, the support rod 4 gradually approaches the support pipe 101 and is stored. At this time, the end of the support rod 4 away from the grouting head 103 is also separated from the lower surface of the cement concrete slab 6, and the pressure in the elastic expansion member 2 is released, and the grouting head assembly is taken out from the drilled hole 9 in the road surface.

[0097] The pavement repair grouting process provided in this application has a great guiding role in repairing pavement, and helps to improve the quality and efficiency of repair. Moreover, the above-mentioned construction process is safer and more reliable.

[0098] In this embodiment, preferably, Figures 1 to 3As shown, the grouting operation includes the following steps: after the elastic expansion member 2 expands and the pressure between the elastic expansion member 2 and the hole wall reaches 3Mpa, a pulse cement grouting machine is used to inject the configured cement slurry into the grouting pipe 102, and then when the maximum pressure of the grouting after pressure stabilization reaches the preset pressure, the grouting is stopped, and when the maximum pressure of the grouting after pressure stabilization still does not reach the preset pressure, when overflow occurs in the adjacent boreholes, the grouting is stopped, and the double insurance effect is adopted to ensure the repair quality of the road surface, avoid excessive grouting, excessive pressure, and the like, which leads to arching of the road surface, etc., which is safer and more reliable, and can also avoid waste of slurry.

[0099] Among them, the pressure during normal grouting is 0.4~0.8Mpa, the pressure during maximum pressure grouting is controlled at 1.2Mpa, and the opening of the slurry valve during grouting is set to 50%~60%. The above parameters can strictly control the grouting process and guide the operation of the grouting process.

[0100] In this embodiment, preferably, Figure 5 As shown, in the grouting hole layout scheme, a square area covering the area to be repaired is set, and the square area includes the first lane square area 7 and / or the second lane square area 8. The first lane square area 7 is adapted to the cement concrete slab 6 located therebelow, that is, the long side of the first lane square area 7 coincides with the longitudinal joint of the cement concrete slab 6 located therebelow, and the wide side of the first lane square area 7 coincides with the transverse joint of the cement concrete slab 6 located therebelow;

[0101] The second lane square area 8 is adapted to the cement concrete slab 6 located therebelow, and for details, please refer to the above description of the first lane square area 7;

[0102] The first lane square area 7 has a five-hole arrangement, and the five drill holes of the first lane square area 7 are respectively arranged at the four corners and the midpoint of the first lane square area 7;

[0103] The second lane square area 8 has a seven-hole arrangement, and three of the seven holes in the second lane square area 8 are evenly arranged on one side of the area to be repaired, the other three holes are evenly arranged on the other side opposite to the area to be repaired, and the last hole is arranged at the midpoint of the area to be repaired.

[0104] Note that lanes generally include a first lane 10, a second lane 11, and an emergency lane 12 arranged in sequence. The first lane 10 is a fast lane primarily used by light vehicles. Five drill holes are set in the area to be repaired in the first lane 10, and the five drill holes are arranged at the four corners and the midpoint of the area to be repaired. This ensures that the entire area to be repaired is covered while avoiding excessive drilling that would affect the road surface, thereby ensuring the quality of the road repair.

[0105] Among them, the second lane 11 is a slow lane, which is mainly used by heavy trucks and the road surface is more seriously damaged, so the grouting points will be increased, so the number of drill holes is increased to seven, and the seven drill holes are arranged in the above-mentioned manner, which can not only cover the entire area to be repaired, but also avoid excessive drilling holes that affect the road surface and ensure the quality of road repair.

[0106] Optionally, a road drilling machine is used to drill holes in the road surface, with a hole diameter of less than 5 cm.

[0107] In this embodiment, preferably, Figures 1 to 3 As shown, the ratio of cement slurry is as follows: cement: water: expansive agent: high-efficiency water reducer = 1.5:0.75:0.0003:0.24 (mass fraction ratio), and the properties of the cement slurry formed by the above ratio are shown in Table 1 below.

[0108] Table 1 Performance indicators of cement slurry

[0109]

[0110]

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A grouting head assembly, characterized in that: include: A grouting head body and an elastic expansion member; wherein the elastic expansion member is arranged outside the grouting head body; The elastic expansion member has a hollow structure with a variable internal volume; The elastic expansion member is formed with an inlet end for connecting to a pressure source; The elastic expansion member is an elastic tube, and the elastic tube is wound around the outside of the grouting head body, one end of the elastic tube is formed as the inlet end, and the other end of the elastic expansion member is formed as a closed end; The elastic expansion member is bonded to the exterior of the grouting head body; The grouting head body includes a supporting pipe, a grouting pipe and a grouting head connected to the grouting pipe; Wherein, the grouting pipe is arranged inside the supporting pipe, and the grouting pipe is rotatably connected to the supporting pipe, and the grouting head can extend out of the supporting pipe; The elastic expansion member is arranged outside the supporting pipe; The grouting head assembly further includes an elastic ring and a support rod; wherein the elastic ring is sleeved on the outside of the support pipe and connected to the support pipe; One end of the support rod is fixedly connected to the grouting head, and the other opposite end of the support rod is inserted into an installation space formed by the elastic ring and the outer wall surface of the support pipe.

2. The grouting head assembly according to claim 1, characterized in that: The grouting head assembly further includes a fixing ring, which is sleeved on the outside of the grouting head body, and a portion of the elastic expansion member is pressed between the fixing ring and the grouting head body.

3. The grouting head assembly according to claim 1, characterized in that: The grouting head assembly further includes a pressurizing device serving as the pressure source, and the pressurizing device is configured to expand the elastic expansion member along a circumferential direction away from the grouting head body.

4. A method for using a grouting head assembly, characterized in that: Based on the grouting head assembly according to claim 1, the method for using the grouting head assembly comprises the following steps: Inserting a portion of the support pipe of the grouting head body, a portion of the grouting pipe, and the grouting head together with the elastic expansion member into a drilled hole in a road surface, wherein the drilled hole in the road surface is deep enough to be below a cement concrete slab, and the grouting head together with the support rod are all located below the cement concrete slab; The grouting pipe is rotated and lifted, and the grouting pipe drives the grouting head and the support rod to move upward, and the support rod interferes with the support pipe and is forced to open with the grouting head as the center until the end of the support rod away from the grouting head abuts against the lower surface of the cement concrete slab, and pressure is applied to the elastic expansion member, so that the elastic expansion member expands and blocks the drilled hole in the road surface; After grouting is completed in the drilled hole of the pavement through the grouting head body, the grouting pipe is moved downward, and the grouting pipe drives the grouting head and the support rod to move downward. Under the pressure of the elastic ring, the support rod gradually approaches the support pipe and is stored. At this time, the end of the support rod away from the grouting head is also separated from the lower surface of the cement concrete slab, and the pressure in the elastic expansion member is released, and the grouting head assembly is taken out from the drilled hole of the pavement.

5. A road repair grouting process, characterized in that: Based on the grouting head assembly according to claim 1, the pavement repair grouting process includes the following steps: Pavement drilling: Drill holes in the pavement according to the grouting hole layout plan, with the hole depth reaching below the cement concrete slab; Prepare cement slurry: prepare cement, water, expansion agent and high-efficiency water reducing agent into cement slurry according to the preset proportion; Installing the grouting head assembly: inserting a portion of the support pipe of the grouting head body, a portion of the grouting pipe, and the grouting head together with the elastic expansion member into a drilled hole in a road surface, wherein the drilled hole in the road surface is deep enough to be below a cement concrete slab, and the grouting head together with the support rod are located below the cement concrete slab; The grouting pipe is rotated and lifted, and the grouting pipe drives the grouting head and the support rod to move upward, and the support rod interferes with the support pipe, and is forced to open with the grouting head as the center, until the end of the support rod away from the grouting head abuts against the lower surface of the cement concrete slab, and pressure is applied to the elastic expansion member, so that the elastic expansion member expands and blocks the drilled hole in the road surface; Grouting operation: injecting the prepared cement slurry into the grouting pipe; Removing the grouting head assembly: After the grouting is completed, the grouting pipe is moved downward, and the grouting pipe drives the grouting head and the support rod to move downward. Under the pressure of the elastic ring, the support rod gradually approaches the support pipe and is stored. At this time, the end of the support rod away from the grouting head is also separated from the lower surface of the cement concrete slab, and the pressure in the elastic expansion member is released, and the grouting head assembly is taken out from the drilled hole in the road surface; The grouting operation includes the following steps: under the condition that the pressure between the elastic expansion member and the hole wall reaches 3 MPa after expansion, the prepared cement slurry is injected into the grouting pipe by using a pulse cement grouting machine, and then the grouting is stopped when the maximum pressure of the grouting after pressure stabilization reaches a preset pressure, and when the maximum pressure of the grouting after pressure stabilization still does not reach the preset pressure, the grouting is stopped when overflow occurs in the adjacent borehole; The pressure during normal grouting is 0.4-0.8 MPa, the pressure during maximum pressure grouting is controlled at 1.2 MPa, and the opening of the grouting valve during grouting is set at 50%-60%; and / or In the grouting hole layout scheme, a square area covering the area to be repaired is set, and the square area includes a first lane square area and / or a second lane square area. The first lane square area is adapted to the cement concrete slab located therebelow, and the second lane square area is adapted to the cement concrete slab located therebelow. The first lane square area has a five-hole arrangement, and the five drill holes in the first lane square area are respectively arranged at the four corners and the midpoint of the first lane square area; The second lane square area is arranged with seven holes, and three of the seven drill holes in the second lane square area are evenly arranged on one side of the area to be repaired, the other three drill holes are evenly arranged on the other side opposite to the area to be repaired, and the last drill hole is arranged at the midpoint of the area to be repaired.

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