Shoe sleeve type anchor rod and anchor cable construction system below underground water level line

Abstract

The utility model relates to a shoe sleeve type anchor rod and anchor cable construction system below an underground water level line, which comprises a drilling machine, a grouting machine, a pressure-maintaining discharge-limiting and grouting device, a pressure-maintaining grouting device, an outer sleeve, a shoe sleeve and an anchor rod body / anchor cable body, the two ends of the pressure-maintaining discharge-limiting and grouting device are connected with an outer sleeve and a power head of the drilling machine respectively, and an inner drill rod of the drilling machine penetrates through an inner cavity of the pressure-maintaining discharge-limiting and grouting device and is connected with the power head of the drilling machine; one end of the pressure-maintaining grouting device is connected with the outer sleeve, the inner drill rod penetrates through the pressure-maintaining grouting device, and the grouting machine is used for grouting the bottom area, located in the anchor hole, of the outer sleeve through the inner drill rod to form a bottom reinforcing area; the boot cover is mounted to the reinforced bottom area; one end of the anchor rod body / anchor cable body is fixedly installed at the boot sleeve, and the other end of the anchor rod body / anchor cable body is tensioned.

Description

Technical Field

[0001] The utility model relates to the fields of foundation pits, deep foundation pits and other underground projects, and in particular to an anchor rod and anchor cable construction system in foundation pits, deep foundation pits and other underground projects, and more specifically to an anchor rod and anchor cable construction system below the groundwater level. Background Art

[0002] With the development of the economy and the expansion of urban construction, high-rise buildings, large buildings and various underground facilities are increasing, and the scale of foundation pits and other underground projects is also getting larger and larger. In the construction process of underground projects, the support form of "enclosing structure + anchor rod (anchor cable)" is often used.

[0003] In the past, support work required for underground facilities was relatively shallow, perhaps only about 10 meters, while the groundwater level was around 30 meters. Therefore, traditional retaining structures combined with anchor rods or cables could easily achieve support. However, with increasing awareness of environmental protection and the maturation of groundwater protection measures, the groundwater level is rising year by year.

[0004] However, as the groundwater level rises, the depth of underground engineering construction is required to be deeper and deeper, sometimes even reaching a depth of 20 to 30 meters underground, which intersects with the groundwater level. At this time, when the traditional "enclosure structure + anchor rod (anchor cable)" support form is adopted, if the groundwater level is high during the construction of anchor rods or anchor cables, a large amount of groundwater will gush out during the drilling process, which is accompanied by a large amount of medium loss in the stratum, causing the enclosure structure to sink and deform significantly, thereby affecting the safety of surrounding structures and posing a serious safety hazard.

[0005] In addition, during the construction process of water-rich sand layers, when drilling is carried out using casing follow-up construction, due to the poor cohesion of the sand layer, under the action of water pressure, after drilling to the designed depth, water and sand will gush out from the end of the casing, causing the casing to be blocked by sand and the anchor rods or anchor cables to be unable to be installed smoothly.

[0006] Therefore, providing a construction system suitable for below the groundwater level that can successfully complete the installation of anchor rods and anchor cables has become an issue that urgently needs to be solved in the industry. Utility Model Content

[0007] In response to the above problems, one of the purposes of the present utility model is to provide a boot-type anchor rod and cable construction system below the groundwater level line, which controls the sand gushing from the hole through a hole mouth anti-burst device, limits the amount of sand discharged from the drilling hole by using a pressure-maintaining and limiting discharge and grouting device, and uses pressure-maintaining grouting to grout the bottom of the anchor hole to form a bottom reinforcement area. At the same time, the boot sleeve is used to lock the anchor rod body / anchor cable body, thereby realizing the smooth construction of anchor rods and cables below the groundwater level line, and providing a new option for the construction of anchor rods and cables below the water level line in the industry.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] The utility model provides a boot-type anchor rod and anchor cable construction system below the groundwater level line, which includes: a drilling rig, a grouting machine, a pressure-maintaining and limiting drainage and grouting device, a pressure-maintaining grouting device, an outer sleeve, a boot and an anchor rod body / anchor cable body, wherein:

[0010] The pressure-maintaining, drain-limiting and grouting device and the drilling rig are used for drilling holes to form anchor holes and performing pressure-maintaining grouting on the interior of the outer casing. During the drilling process, the two ends of the pressure-maintaining, drain-limiting and grouting device are respectively connected to the outer casing and the power head of the drilling rig, and the inner drill rod of the drilling rig passes through the inner cavity of the pressure-maintaining, drain-limiting and grouting device and is connected to the power head of the drilling rig. During the pressure-maintaining grouting process, the two ends of the pressure-maintaining, drain-limiting and grouting device are respectively connected to the outer casing and the power head of the drilling rig, and pressure-maintaining grouting is performed from the air sleeve of the power head.

[0011] The pressure-maintaining grouting device and the grouting machine are used to grout the bottom of the anchor hole to form a bottom reinforcement area. Before grouting, the connection between the pressure-maintaining limiter and the drilling rig is removed. During the grouting process, one end of the pressure-maintaining grouting device is connected to the outer casing, one end of the inner drill rod is connected to the power head, and the other end of the inner drill rod passes through the pressure-maintaining grouting device and extends into the anchor hole. The grouting machine grouts the bottom area of the outer casing located in the anchor hole through the inner drill rod to form a bottom reinforcement area.

[0012] The boot is used to be installed at the bottom of the anchor hole and enter the reinforced bottom area;

[0013] One end of the anchor rod body / anchor cable body is fixedly installed at the boot sleeve, and the other end is tensioned.

[0014] In some embodiments, the anchor rod body or anchor cable body includes: 1 primary grouting steel flower pipe, 2 to 4 secondary grouting steel flower pipes, a bracket and a steel strand, wherein a central through hole is provided in the center of the bracket, 2 to 4 branch holes are provided around the central through hole, and a plurality of semicircular grooves facing the center are provided at the outer edge of the bracket, the primary grouting steel flower pipe is passed through the central through hole, and a secondary grouting steel flower pipe is passed through each branch hole, and each groove accommodates a steel strand, and the 2 to 4 secondary grouting steel flower pipes have different lengths.

[0015] In some embodiments, in step (3), the outer diameter of the outer casing is set to 60 mm to 200 mm, and the outer diameter of the inner drill rod is set to 50 mm to 114 mm.

[0016] In some embodiments, the boot cover includes a boot cover columnar body and a cone connected to the bottom of the columnar body. The outer diameter of the boot cover is set to 60 mm to 200 mm, and the length is set to 10 cm to 300 cm.

[0017] In some embodiments, an orifice anti-blowout device installed at the orifice of the enclosure structure is also included, and the orifice anti-blowout device includes: a fixing plate group, a sealing plate and a positioning plate group, wherein the fixing plate group includes a first end plate fixed to the enclosure structure, a first connecting plate connected to the top end of the first end plate and extending outward, a second connecting plate connected to the bottom end of the first end plate and extending outward, and a second end plate connected between the first connecting plate and the second connecting plate, the length of the first connecting plate is less than the length of the second connecting plate, the sealing plate is arranged on the outer surface of the second end plate, the positioning plate group is pressed at the outer edge of the sealing plate and fixed to the second end plate, a first through hole is opened in the center of the first end plate, a second through hole is opened in the center of the second end plate, and a central through hole is opened in the center of the sealing plate, so that the outer sleeve passes through the central through hole, the second through hole and the first through hole in sequence to enter the underground, and the angle between the first end plate and the second end plate is set to 15 to 25 degrees.

[0018] In some embodiments, a sealing gasket is sandwiched between the first end plate and the enclosure structure.

[0019] In some embodiments, the positioning plate assembly includes a plurality of pressure plate pieces, each of which is disposed around the outer edge of the sealing plate.

[0020] In some embodiments, the first end plate is connected to the enclosure structure by expansion bolts.

[0021] In some embodiments, the diameter of the central through hole is smaller than the diameter of the outer sleeve, and the diameters of the first through hole and the second through hole are larger than the diameter of the outer sleeve.

[0022] In some embodiments, the first end plate and the second end plate are both steel plates.

[0023] In some embodiments, the first end plate and the second end plate are provided with bolt holes.

[0024] In some embodiments, the sealing plate is a rubber plate.

[0025] In some embodiments, the sealing gasket plate is a rubber plate or a polyurethane plate.

[0026] In some embodiments, the pressure-maintaining, discharge-limiting and grouting device includes: a hollow casing, a first interface provided at one end of the hollow casing, a second interface provided at the other end of the hollow casing, and 2 to 3 slag discharge holes arranged in a ring on the outer wall of the hollow casing and connected to the inner cavity of the hollow casing, wherein the aperture of the first interface matches the aperture of the outer sleeve, the aperture of the second interface matches the power head, the aperture of the inner cavity of the hollow casing is larger than the aperture of the inner drill rod, and a valve is provided at the orifice of the slag discharge hole to control the opening and closing state of the corresponding slag discharge hole.

[0027] In some embodiments, the inner wall of the first interface is provided with a first internal thread for threaded connection with the outer sleeve.

[0028] In some embodiments, the inner wall of the second interface is provided with a second internal thread for threaded connection with the power head.

[0029] In some embodiments, an outer wall of the orifice of each slag discharge hole is provided with an external thread for threaded connection with the valve.

[0030] In some embodiments, a ball valve or a butterfly valve is provided at the orifice of each slag discharge hole.

[0031] In some embodiments, the first interface and the second interface have the same diameter.

[0032] In some embodiments, the first interface and the second interface have different diameters.

[0033] In some embodiments, the diameters of the first interface and the second interface are adjusted according to the sizes of the outer casing and the drilling rig power head.

[0034] In some embodiments, the pressure-maintaining grouting device includes: a hollow cavity, a casing port provided at one end of the hollow cavity, a first grouting end plate provided at the other end of the hollow cavity, a second grouting end plate bolted to the first grouting end plate, and a sealing chamber body clamped between the first grouting end plate and the second grouting end plate, wherein the inner wall of the casing port is provided with an internal thread for threaded connection with the outer casing, the first grouting end plate, the second grouting end plate and the sealing chamber body are provided with coaxial through holes, a sealing member is provided in the sealing chamber body, and the inner diameter of the sealing member matches the outer diameter of the inner drill rod.

[0035] In some embodiments, the outer diameter of the inner drill rod is 1 to 2 cm smaller than the diameter of the through hole of the sealed chamber.

[0036] In some embodiments, the diameter of the through hole of the first grouting end plate is 1 to 2 cm larger than the outer diameter of the inner drill rod.

[0037] In some embodiments, the seal is a V-type composite seal.

[0038] In some embodiments, the hollow cavity is integrally connected to the first end plate.

[0039] By adopting the above technical solutions, the present invention has at least achieved the following technical effects: (1) when drilling, the hole mouth anti-burst device can realize anti-burst outside the casing, so as to avoid water and sand gushing out of the outer side of the outer casing during drilling, causing deformation of the ground and surrounding structures; (2) when drilling, the opening and closing states of the valves at the slag discharge holes of the pressure-maintaining and limiting discharge and grouting devices are adjusted to control the amount of sand discharged during the drilling process, thereby controlling the loss of the medium in the formation and avoiding deformation of the surrounding structures; (3) the pressure-maintaining grouting device is connected to the outer casing, the inner drill rod is passed through the inside of the device, and then grouting is carried out, so as to achieve the effect of maintaining pressure inside the outer casing and preventing the slurry from flowing back into the outer casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of the bracket of the anchor cable body of the present invention is shown;

[0041] Figure 2-Figure 10 Shows a schematic diagram of the construction process state of the utility model;

[0042] Figure 11 A side sectional view of the orifice anti-burst device of the present invention is shown;

[0043] Figure 12 Shows a front view of the orifice anti-burst device of the present utility model;

[0044] Figure 13It shows a schematic structural diagram of the pressure-maintaining, exhaust-limiting and grouting device of the present invention;

[0045] Figure 14 A schematic diagram showing the use status of the pressure-maintaining, exhaust-limiting and grouting device of the present invention is shown;

[0046] Figure 15 Shows a schematic structural diagram of the pressure-maintaining grouting device of the present invention;

[0047] Figure 16 A schematic diagram of the use state of the pressure-maintaining grouting device of the present invention is shown;

[0048] Figure 17 Shows a schematic structural diagram of the boot cover of the present invention;

[0049] Description of reference numerals:

[0050] 0-embedded hole, 1-enclosure structure, 2-drilling rig, 3-power head, 4-outer casing, 5-inner drill rod, 6-bottom reinforcement area, 7-mixing barrel, 8-grouting machine, 9-grouting pipe, 10-sleeve, 101-sleeve columnar body, 102-cone, 11-anchor body, 110-bracket, 1101-center through hole, 1102-sub-hole, 1103-groove, 12-air sleeve, K-hole mouth anti-burst device, K1-fixed plate group, K2-sealing plate, K3-positioning plate group, K1-fixed plate group, K11-first end plate, K110-first through hole, K12-second end plate, K120-second through hole, KL1 -First connecting plate, KL2-second connecting plate, K2-sealing plate, K20-center through hole, K3-positioning plate group, K30-pressure plate, K4-sealing pad, X-pressure maintaining, limiting and grouting device, X1-hollow casing, X11-first interface, X110-first internal thread, X12-second interface, X120-second internal thread, X13-slag discharge hole, X130-valve, J-pressure maintaining grouting device, J1-hollow cavity, J2-casing port, J21-internal thread, J3-first end plate, J4-second end plate, J5-sealing bin, J6-seal, Q-bolt, P-expansion bolt, S-underground. DETAILED DESCRIPTION

[0051] To make the purpose, technical solution, and advantages of the present invention more clearly apparent, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0052] In the description of this utility model, it should be noted that the terms "upper," "lower," "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 utility model and simplify the description. They do not indicate or imply that the systems 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 utility model. Furthermore, the use of terms such as "first" and "second" to define components is solely for the purpose of distinguishing between such components. Unless otherwise stated, these terms have no special meanings and should not be construed as indicating or implying relative importance.

[0053] In the description of this utility model, 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, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0054] Next, the boot-type anchor rod and anchor cable construction system below the groundwater level line of the present invention will be described in detail with reference to the accompanying drawings.

[0055] The utility model provides a boot-type anchor rod and anchor cable construction system below the groundwater level line, which includes: a drilling rig, a grouting machine, a hole mouth anti-burst device K, a pressure-maintaining and limited discharge and grouting device X, a pressure-maintaining and grouting device J, an outer sleeve 4, a boot and an anchor rod body and an anchor cable body.

[0056] The pressure-maintaining, drain-limiting, and grouting device X and the drilling rig are used to drill holes to form anchor holes and perform pressure-maintaining grouting on the interior of the outer casing 4. During the drilling process, the two ends of the pressure-maintaining, drain-limiting, and grouting device X are respectively connected to the outer casing 4 and the drilling rig's power head 3. The drilling rig's inner drill rod 5 passes through the inner cavity of the pressure-maintaining, drain-limiting, and grouting device X and is connected to the drilling rig's power head 3. During the pressure-maintaining grouting process, the two ends of the pressure-maintaining, drain-limiting, and grouting device X are respectively connected to the outer casing 4 and the drilling rig's power head 3, and pressure-maintaining grouting is performed at the air sleeve of the power head 3. The pressure-maintaining grouting device J and the grouting machine are used to grout the bottom of the anchor hole to form a reinforced bottom area. Before grouting, the connection between the pressure-maintaining, drain-limiting, and grouting device J and the drilling rig is removed. During the grouting process, one end of the pressure-maintaining, drain-limiting, and grouting device J is connected to the outer casing 4, and the inner drill rod 5 is passed through the pressure-maintaining, drain-limiting, and grouting device J. The grouting machine grouts the bottom area of the outer casing 4 located in the anchor hole through the inner drill rod 5 to form a bottom reinforcement area. The boot sleeve is used to be installed to the bottom of the anchor hole and enter the reinforced bottom area. One end of the anchor rod body / anchor cable body is fixedly installed at the boot sleeve, and the other end is tensioned.

[0057] Specifically, during the construction of the boot-type anchor rod and anchor cable construction system provided by the present invention, first, an anchor rod body or anchor cable body 11 is made according to a predetermined length. In this non-limiting embodiment, the anchor cable body 11 includes: a primary grouting steel flower pipe, three secondary grouting steel flower pipes, a bracket 110 and a steel strand, wherein, as Figure 1 As shown, the center of the bracket 110 is provided with a central through hole 1101, three branch holes 1102 and six semicircular grooves 1103. A primary grouting steel flower tube is passed through the central through hole 1101, and a secondary grouting steel flower tube is passed through each branch hole 1102. A steel strand is accommodated in each groove 1103, so that the anchor body 11 is fastened into a whole using the bracket 110.

[0058] Then, if Figure 2 As shown, the periphery of the embedded hole 0 of the anchor rod body or anchor cable body on the surface of the enclosure structure 1 is first roughened, and then the hole mouth anti-burst device K is installed, wherein the hole mouth anti-burst device K is firmly connected to the enclosure structure 1 using expansion bolts.

[0059] Then, if Figure 3 As shown, first, the two ends of the pressure-maintaining, drainage-limiting, and grouting device X are connected to the power head 3 and outer casing 4 of the drilling rig 2, respectively. The inner drill rod 5 is passed through the inner cavity of the pressure-maintaining, drainage-limiting, and grouting device X and connected to the drilling rig power head 3. The hole is drilled through the hole mouth anti-blowout device K at the hole location until the hole is drilled to the designed depth, forming an anchor hole. During the drilling process, a pneumatic drill, a water drill, or a mud wall protection process can be used to form the hole. By adjusting the opening and closing state of the valve at the slag discharge hole of the pressure-maintaining, drainage-limiting, and grouting device X, the amount of sand or slag discharged during the drilling process is controlled to maintain the formation pressure and avoid affecting the formation stability.

[0060] When the drilling reaches the designed depth, the outer casing 4 is separated from the pressure-maintaining and limiting drainage and grouting device X, and bentonite slurry is first injected into the outer casing 4 through the inner drill rod 5. After the outer casing 4 is filled with bentonite slurry, Figure 4 As shown, one end of the pressure-maintaining grouting device J is connected to the outer casing 4, one end of the inner drill rod 5 is connected to the power head 3 of the drilling rig 2, the other end of the inner drill rod 5 passes through the pressure-maintaining grouting device J and extends into the anchor hole, and is connected to the grouting machine 8 through the grouting pipe 9. The slurry stirred in the mixing barrel 7 is injected into the bottom area of the outer casing through the grouting machine 8 and the inner drill rod 5 to reinforce the 1 to 5 meter stratum in the bottom area of the hole to form a bottom reinforcement area 6.

[0061] Then, if Figure 5 As shown, the pressure-maintaining grouting device J is removed, and a steel pipe is inserted into the anchor hole until the bottom end of the outer sleeve 4. Bentonite slurry is poured into the steel pipe to wash the hole. After washing the hole, the pre-made boot cover 10 is installed to the bottom of the hole and enters the bottom reinforcement area 6. Figure 17As shown, the boot cover 10 includes a boot cover columnar body 101 and a cone 102 connected to the bottom of the columnar body 101. The outer diameter of the boot cover 10 is set to 100 mm and the length is set to 200 cm.

[0062] Then, if Figure 6 As shown, the anchor cable body 11 manufactured in advance is installed in the outer sleeve 4, extended downward along the outer sleeve 4 until it enters the boot sleeve 10, and the grouting machine 8 and the primary grouting pipe in the anchor cable body 11 are connected through the grouting pipe 9. The slurry stirred in the mixing barrel 7 is poured into the outer sleeve 4 through the grouting machine 8 and the primary grouting hole of the anchor cable body 11 and filled.

[0063] Then, if 7A to 7D As shown, the pressure-maintaining, drain-limiting and grouting device X is installed again, and the two ends of the pressure-maintaining, drain-limiting and grouting device X are respectively connected to the outer casing 4 and the power head 3 of the drilling rig, and the grouting machine 8 and the air sleeve 12 of the power head 3 are connected through the grouting pipe 9. Grouting is carried out from the air sleeve 12. While grouting, the outer casing 4 is slowly pulled out until it is pulled out to the outside of the retaining structure 1.

[0064] Then, if Figure 8 As shown, the grouting machine 8 and the pressure-maintaining and limiting grouting device X are connected through the grouting pipe 9, the stirred slurry in the mixing barrel 7 is injected through the grouting machine 8, and a suitable amount of water glass is added to quickly seal the embedded hole 0, and the outer sleeve 4 is removed.

[0065] Afterwards, if Figure 9 As shown, after the outer sleeve 4 is removed, the anchor cable body 11 is subjected to secondary supplementary grouting after the strengthening time is not less than 24 hours.

[0066] Finally, if Figure 10 As shown, 7 to 10 days after the second supplementary grouting is completed, the anchor cable body is tensioned and locked according to the designed tension value. If there is water leakage at the hole, the hole is sealed with a second grouting through the reserved grouting pipe, thus completing the entire construction process.

[0067] In this non-limiting embodiment, Figure 11 As shown, the orifice anti-burst device K includes: a fixing plate group K1, a sealing plate K2 and a positioning plate group K3.

[0068] Specifically, the fixing plate group K1 includes: a first end plate K11, a second end plate K12, a first connecting plate KL1, and a second connecting plate KL2. The first end plate K11 is firmly connected to the enclosure structure 1 by expansion bolts P. The first connecting plate KL1 is welded to the top of the first end plate K11 and extends outward. The second connecting plate KL2 is welded to the bottom of the first end plate K11 and extends outward. The second end plate K12 is welded between the first connecting plate KL1 and the second connecting plate KL2. Figure 11As shown, the length of the first connecting plate KL1 is shorter than that of the second connecting plate KL2, thereby forming a certain angle between the first end plate K11 and the second end plate K12, thereby achieving the effect of oblique insertion into the outer casing and oblique tensioning of the anchor rod and cable. In this non-limiting embodiment, the first connecting plate KL1 and the second connecting plate KL2 can be steel pipes or steel plates.

[0069] like Figure 11 and Figure 12 As shown, a sealing plate K2 made of a rubber plate is arranged on the outer surface of the second end plate K12, a positioning plate group K3 is pressed on the outer edge of the sealing plate K2, and is fixed to the second end plate K12 by a bolt Q, a first through hole K110 is opened in the center of the first end plate K11, a second through hole K120 is opened in the center of the second end plate K12, and a central through hole K20 is opened in the center of the sealing plate K2, so that the outer sleeve 4 can pass through the central through hole K20, the second through hole 110 and the first through hole 120 in sequence to enter the underground S.

[0070] In this non-limiting embodiment, in order to prevent water and sand from gushing between the first end plate K11 and the enclosure structure 1 , a sealing pad K4 made of a rubber plate or a polyurethane plate is sandwiched between the first end plate K11 and the enclosure structure 1 .

[0071] In order to prevent underground mud and sand from gushing out from the outer wall of the outer casing, the diameter of the central through hole K20 of the utility model is smaller than the diameter of the outer casing 4, thereby utilizing the elasticity of the sealing plate itself so that the central through hole K20 can tightly clamp the outer wall of the outer casing 4.

[0072] As another non-limiting embodiment, Figure 12 As described above, the positioning plate assembly K3 includes a plurality of pressure plates K30 , each of which is arranged around the outer edge of the sealing plate K3 and then fixed to the second end plate K12 by bolts, thereby achieving a fixing effect of the sealing plate K3 .

[0073] Therefore, when using the hole mouth anti-bumping device K, first, the first end plate K11 is firmly connected to the enclosure structure 1 by the expansion bolt P, and the first end plate K11 and the enclosure structure 1 are sealed with a sealing gasket K4 made of a rubber plate or a polyurethane plate. The second end plate K12 is inclined at an angle of 20 degrees to the first end plate through the first connecting plate KL1 and the second connecting plate KL2, and the central through hole K20 of the sealing plate K2 is aligned with the second through hole K120 of the second end plate K12, and then the outer sleeve 4 is passed through the central through hole K20, the second through hole K120 and the first through hole K110 in sequence to the underground S, and then each pressure plate K30 is pressed on the sealing plate K2 and fixed to the second end plate K12 by bolts Q, thereby completing the entire installation process.

[0074] In this non-limiting embodiment, Figure 13 As shown, the pressure-maintaining, discharge-limiting and grouting device X includes: a hollow casing X1 with a hollow structure inside, the two ends of the hollow casing X1 are respectively a first interface X11 and a second interface X12, and two slag discharge holes 13 connected to the inner cavity of the hollow casing X1 are provided on the outer wall of the hollow casing X1.

[0075] During use, if Figure 14 As shown, the inner drill rod 5 can pass through the inner cavity of the hollow casing X1, the aperture of the first interface X11 matches the aperture of the outer sleeve 4, and the inner wall of the first interface X11 is provided with a first internal thread X110, so that it can be threadedly connected to the outer sleeve 4, the aperture of the second interface X12 matches the power head 3, and the inner wall of the second interface X12 is provided with a second internal thread X120, so that it can be threadedly connected to the power head 3, and a ball valve or butterfly valve serving as a valve X130 is provided at the orifice of the slag discharge hole X13 to control the opening and closing state of the corresponding slag discharge hole.

[0076] Thus, during drilling construction, the drilling rig is connected to the outer casing 4 via the first interface X11, and the inner drill rod 5 passes through the interior of the hollow casing X1. When using a pneumatic drill, a water drill, or a mud wall to drill a hole, the amount of slag discharge from the drilling hole is controlled by controlling the opening and closing of the ball valve or butterfly valve at the orifice of the slag discharge hole X13 according to the amount of slag discharge from the stratum, thereby achieving the purpose of controlling deformation. After the anchor rod or anchor cable is installed, when it is necessary to pull out the outer casing 4, the opening and closing of the ball valve or butterfly valve at the orifice of the slag discharge hole X13 are completely closed, and then the grouting pump and the drilling rig power head 3 are connected via the grouting pipe. While the outer casing 4 is being pulled out, the grouting pump injects cement slurry through the outer casing 4 to maintain pressure in the outer casing 4 to prevent the stratum medium from flowing into the outer casing 4, wrapping the outer casing 4 and the anchor cable body 11, and causing the anchor cable body 11 to be pulled out together with the outer casing 4.

[0077] As another non-limiting embodiment, in the pressure-maintaining grouting device J, Figure 15 As shown, the invention comprises a hollow cavity J1, a first end plate J3, a second end plate J4, and a sealing chamber J5. Specifically, a casing port J2 is provided at one end of the hollow cavity J1, and a first end plate J3 is integrally connected to the other end of the hollow cavity J1. The second end plate J4 is connected to the first end plate J3 via bolts Q. The sealing chamber J5 is sandwiched between the first and second end plates J3 and J4. The first and second end plates J3 and J4 are provided with coaxial through-holes, and a sealing member J6 is provided within the sealing chamber J5. The diameter of the casing port J2 matches that of the outer sleeve 4. The inner wall of the casing port J2 is provided with an internal thread J21, allowing for threaded connection with the outer sleeve 4. The inner diameter of the sealing member J6 matches the outer diameter of the inner drill rod 5, thereby achieving a sealing effect on the inner drill rod 5 using the sealing member J6.

[0078] During use, before grouting the bottom, if Figure 16 As shown, the pressure-maintaining grouting device J is connected to the outer casing 4 through the casing port J2. Since the interior of the pressure-maintaining grouting device J is a hollow structure, the inner drill rod 5 passes through the second end plate J4, the sealing chamber J5, the first end plate J3 in sequence, and passes through the interior of the hollow cavity J1. A V-shaped combined seal J6 is installed in the sealing chamber J5. The tightness of the V-shaped combined seal J6 is controlled by the bolts Q on the second end plate J4 and the first end plate J3 to seal the inner drill rod 5 tightly. Then, grouting is carried out to achieve the effect of maintaining pressure in the outer casing and preventing the slurry from flowing back into the outer casing.

[0079] As another non-limiting embodiment, Figure 17 As shown, the boot cover 10 used in the present invention includes a boot cover columnar body 101 and a cone 102 connected to the bottom of the columnar body 101. The outer diameter of the boot cover 10 is set to 100 mm and the length is set to 200 cm.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention 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 of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A boot-type anchor rod and cable construction system below the groundwater level, characterized in that: include: Drilling rig, grouting machine, pressure-maintaining and limiting drainage and grouting device, pressure-maintaining grouting device, outer casing, boot sleeve and anchor rod body / anchor cable body, among which, The pressure-maintaining, drain-limiting and grouting device and the drilling rig are used for drilling holes to form anchor holes and performing pressure-maintaining grouting on the interior of the outer casing. During the drilling process, the two ends of the pressure-maintaining, drain-limiting and grouting device are respectively connected to the outer casing and the power head of the drilling rig, and the inner drill rod of the drilling rig passes through the inner cavity of the pressure-maintaining, drain-limiting and grouting device and is connected to the power head of the drilling rig. During the pressure-maintaining grouting process, the two ends of the pressure-maintaining, drain-limiting and grouting device are respectively connected to the outer casing and the power head of the drilling rig, and pressure-maintaining grouting is performed from the air sleeve of the power head. The pressure-maintaining grouting device and the grouting machine are used to grout the bottom of the anchor hole to form a reinforced bottom area. During the grouting process, one end of the pressure-maintaining grouting device is connected to the outer casing, one end of the inner drill rod is connected to the power head, and the other end of the inner drill rod passes through the pressure-maintaining grouting device and extends into the anchor hole. The grouting machine grouts the bottom area of the outer casing located in the anchor hole through the inner drill rod to form a bottom reinforced area. The boot is used to be installed at the bottom of the anchor hole and enter the reinforced bottom area; One end of the anchor rod body / anchor cable body is fixedly installed at the boot sleeve, and the other end is tensioned.

2. The boot-type anchor rod and cable construction system below the groundwater level according to claim 1 is characterized in that: The anchor rod body or anchor cable body includes: a primary grouting steel flower pipe, 2 to 4 secondary grouting steel flower pipes surrounding the periphery of the primary grouting steel flower pipe, wherein a central through hole is provided in the center of the bracket, and 2 to 4 branch holes are provided around the central through hole, and a plurality of semicircular grooves facing the center are provided at the outer edge of the bracket, the primary grouting steel flower pipe is passed through the central through hole, and a secondary grouting steel flower pipe is passed through each of the branch holes, and a steel strand is accommodated in each groove, and the 2 to 4 secondary grouting steel flower pipes have different lengths.

3. The boot-type anchor rod and cable construction system below the groundwater level according to claim 1 is characterized in that: The pressure-maintaining, discharge-limiting and grouting device includes: a hollow casing, a first interface provided at one end of the hollow casing, a second interface provided at the other end of the hollow casing, and 2 to 3 slag discharge holes arranged in a ring on the outer wall of the hollow casing and connected to the inner cavity of the hollow casing, wherein the aperture of the first interface matches the aperture of the outer sleeve, the aperture of the second interface matches the power head, the aperture of the inner cavity of the hollow casing is larger than the aperture of the inner drill rod, and a valve is provided at the orifice of the slag discharge hole to control the opening and closing state of the corresponding slag discharge hole.

4. The boot-type anchor rod and cable construction system below the groundwater level according to claim 3 is characterized in that: The inner wall of the first interface is provided with a first internal thread for threaded connection with the outer sleeve; the inner wall of the second interface is provided with a second internal thread for threaded connection with the power head.

5. The boot-type anchor rod and cable construction system below the groundwater level according to claim 1 is characterized in that: The pressure-maintaining grouting device includes: a hollow cavity, a casing port provided at one end of the hollow cavity, a first grouting end plate provided at the other end of the hollow cavity, a second grouting end plate bolted to the first grouting end plate, and a sealing chamber body clamped between the first grouting end plate and the second grouting end plate, wherein the inner wall of the casing port is provided with an internal thread for threaded connection with the outer casing, the first grouting end plate, the second grouting end plate and the sealing chamber body are provided with coaxial through holes, a sealing member is provided in the sealing chamber body, and the inner diameter of the sealing member matches the outer diameter of the inner drill rod.

6. The boot-type anchor rod and cable construction system below the groundwater level according to claim 5 is characterized in that: The outer diameter of the inner drill rod is 1 to 2 cm smaller than the diameter of the through hole of the sealing chamber, and the diameter of the through hole of the first grouting end plate is 1 to 2 cm larger than the outer diameter of the inner drill rod.

7. The boot-type anchor rod and cable construction system below the groundwater level according to claim 6 is characterized in that: The sealing element is a V-shaped combined sealing element.

8. The boot-type anchor rod and cable construction system below the groundwater level according to claim 5, characterized in that: It also includes an orifice anti-burst device installed at the orifice of the enclosure structure, the orifice anti-burst device includes: a fixing plate group, a sealing plate and a positioning plate group, wherein, The fixing plate assembly includes a first end plate fixed to the enclosure structure, a first connecting plate connected to the top end of the first end plate and extending outward, a second connecting plate connected to the bottom end of the first end plate and extending outward, and a second end plate connected between the first connecting plate and the second connecting plate, the length of the first connecting plate is less than the length of the second connecting plate, and the angle between the first end plate and the second end plate is set to be 15 to 25 degrees; The sealing plate is arranged on the outer surface of the second end plate; The positioning plate assembly is pressed onto the outer edge of the sealing plate and fixed to the second end plate; A first through hole is opened at the center of the first end plate, a second through hole is opened at the center of the second end plate, and a central through hole is opened at the center of the sealing plate, so that the outer sleeve passes through the central through hole, the second through hole and the first through hole in sequence and enters the ground.

9. The boot-type anchor rod and cable construction system below the groundwater level according to claim 8, characterized in that: The hollow cavity is integrally connected to the first end plate.

10. The boot-type anchor rod and cable construction system below the groundwater level according to claim 8, characterized in that: The positioning plate group includes a plurality of pressing plate pieces, and each pressing plate piece is arranged around the outer edge of the sealing plate.

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