Underwater covering-layer-free steep rock pile foundation steel casing mounting device and mounting method thereof

Abstract

The invention provides an underwater covering-layer-free steep rock pile foundation steel casing mounting device and a mounting method thereof.The underwater covering-layer-free steep rock pile foundation steel casing mounting device comprises an outer sleeve, an inner sleeve, an outer sleeve and a steel pipe, the hole-forming rotary excavating part comprises a lifting rod body movably inserted into the bottom end of the outer sleeve, and a hole-forming rotary excavating drill bit located outside the outer sleeve is arranged at the bottom end of the hole-forming rotary excavating rod body; the positioning rotary excavating part comprises a positioning rotary excavating rod body movably penetrating through the hole forming rotary excavating part, and a positioning rotary excavating drill bit penetrating out of the hole forming rotary excavating drill bit is arranged at the bottom end of the positioning rotary excavating rod body; the rotary excavating transmission part comprises a transmission rod which is movably inserted into the outer sleeve from the top end, and the top end of the transmission rod is connected with a drill rod of the rotary excavating machine. By means of the mode that drilling is conducted in advance through the positioning rotary excavating part and chambering is conducted subsequently through the hole forming rotary excavating part, accurate hole forming under the complex rock surface condition is achieved, the perpendicularity and stability of steel casing installation are improved, and the problems of slippage, deviation, bottom deformation and the like which are prone to occurring in traditional construction are effectively solved.

Description

Technical Field

[0001] The invention relates to the field of pile foundation steel casing construction, in particular to an underwater uncovered steep rock pile foundation steel casing installation device and an installation method thereof. Background Art

[0002] Pile foundation steel casing usually has several functions during the pile foundation construction process. The first is to assist the pile foundation drilling equipment in locating the target position and controlling the pile foundation elevation. During the pile foundation drilling and pouring process, it prevents the surrounding unstable rock and soil from falling into the pile and causing collapse. During onshore construction, it can isolate surface water and debris from falling, thereby ensuring the quality of pile foundation pouring. During underwater construction, it also has the function of isolating external water bodies and shaping pile foundation concrete.

[0003] When constructing pile foundations underwater, there are situations where the pile foundation design location is on uncovered steep rock. Traditional construction techniques use a vibrating hammer or impact hammer to drive the steel casing. This technique, during implementation, faces the situation where one side of the bottom of the steel casing collides with the rock while the other side is suspended in the air. This technique directly leads to unfavorable conditions such as deformation of the bottom edge of the steel casing, displacement of the plane position, and vertical sway, causing installation deviation of the steel casing and affecting construction efficiency. Therefore, an underwater uncovered steep rock pile foundation steel casing installation device and installation method are proposed to address the above-mentioned problems. Summary of the Invention

[0004] The main purpose of the present invention is to provide an underwater uncovered steep rock pile foundation steel casing installation device and an installation method thereof, so as to solve the problems in the prior art of bottom curling deformation, plane position dislocation, and vertical swing of the steel casing when constructing on uncovered steep rock.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: an underwater uncovered steep rock pile foundation steel casing installation device and an installation method thereof, comprising: The outer sleeve is hollow inside and has openings at both ends; The hole-forming rotary drilling part includes a lifting rod body movably inserted into the bottom end of the outer sleeve, and the bottom end of the hole-forming rotary drilling rod body is provided with a hole-forming rotary drilling bit located outside the outer sleeve; The positioning rotary drilling part comprises a positioning rotary drilling rod body that movably passes through the hole-forming rotary drilling part, and a positioning rotary drilling drill bit that passes through the hole-forming rotary drilling drill bit is provided at the bottom end of the positioning rotary drilling rod body; The rotary drilling transmission part includes a transmission rod movably inserted into the outer sleeve from the top. The top of the transmission rod is connected to the drill rod of the rotary drilling machine. The bottom end of the transmission rod is provided with a receiving groove for accommodating the positioning rotary drilling rod body. A transmission connection assembly is provided at the notch of the receiving groove for connecting the hole-forming rotary drilling part or the positioning rotary drilling part.

[0006] In the preferred embodiment, a releasable fixing assembly is provided between the lifting rod body and the outer sleeve for fixing the initial height of the hole-forming rotary drilling part; The fixing assembly includes a plurality of fixing grooves arranged in an annular array on the outside of the top end of the lifting rod body. The fixing grooves are in the shape of an inverted "L". The inner wall of the outer sleeve is provided with fixing blocks corresponding to the fixing grooves. A bell mouth is provided at the entrance of the fixing groove; A first positioning sensor is embedded in the bottom of the fixing block, and a first positioning target portion corresponding to the first positioning sensor is embedded in the fixing groove.

[0007] In the preferred embodiment, the top ends of the lifting rod body and the positioning rotary drilling rod body are both provided with connecting parts connected to the transmission connection assembly, wherein the connecting part at the top of the lifting rod body is annular, and the outer diameters of the two connecting parts are the same and can be inserted into the accommodating groove, and the external annular array of the connecting part has multiple card slots.

[0008] In the preferred embodiment, the transmission connection assembly includes a plurality of telescopic seats and a telescopic control assembly in a circular array. The number of telescopic seats corresponds to the slots on a single connection part. The telescopic control assembly is arranged on the outside of the transmission rod to control the connection relationship between the telescopic seat and the slot.

[0009] In a preferred embodiment, the telescopic card seat includes a telescopic opening provided on the card slot and passing through the transmission rod, and telescopic limit grooves are symmetrically provided on the upper and lower sides of the telescopic opening. A wedge-shaped card block is provided in the telescopic opening, the front end of which can be inserted into and out of the transmission rod. Limit plates that slide in cooperation with the telescopic limit grooves are provided at the upper and lower ends of the wedge-shaped card block. A telescopic spring that contacts the limit plate is further provided in the telescopic limit groove to keep the front end of the wedge-shaped card block in a state of being extended. A first contact sensor is embedded in the card slot and is used to sense the connection status of the wedge-shaped card block therewith.

[0010] In a preferred embodiment, the telescopic control assembly includes a fixed ring and a telescopic interference ring, wherein the fixed ring is fixedly mounted on the outside of the transmission rod, and the telescopic interference ring is slidably mounted on the outside of the transmission rod, wherein a wedge-shaped groove is provided on the inner side of the telescopic interference ring to match the wedge-shaped block, and a plurality of downward pressure springs and a contraction control portion are staggered between the fixed ring and the telescopic interference ring; The outer annular array of the transmission rod is provided with a plurality of sliding grooves, and the inner side of the telescopic contact ring is provided with a sliding block which is slidably matched with the sliding grooves.

[0011] In the preferred embodiment, the contraction control part includes an outer sleeve arranged at the bottom of the fixed ring, a telescopic cavity with an open bottom is provided in the outer sleeve, two telescopic grooves are symmetrically provided on the inner wall of the telescopic cavity, a telescopic rod with a top movably inserted in the outer sleeve is provided at the top of the telescopic resistance ring, a telescopic block slidingly engaged with the telescopic groove is provided at the top of the telescopic rod, an electromagnet is provided on the inner top wall of the outer sleeve, and an adsorption block is provided at the top of the telescopic rod.

[0012] In a preferred embodiment, a second positioning target portion is provided at the center of the top of the connection portion on the positioning rotary drilling portion, and a second positioning sensor for positioning the second positioning target portion is embedded in the inner wall of the accommodating groove. When the second positioning target portion matches the second positioning sensor, the height of the transmission connection assembly matches that of the connection portion on the positioning rotary drilling portion. A second contact sensor is provided at the bottom end of the transmission rod. When the second contact sensor contacts the top of the hole-forming rotary drilling part, the height of the transmission connection assembly matches the height of the connection part on the hole-forming rotary drilling part.

[0013] The method includes: S1. Fix the top of the outer casing on the construction platform at the steel casing installation position and ensure that it is in a vertical state. Then connect the top of the rotary drilling transmission part to the drill rod of the rotary drilling rig. S2, connecting the rotary drilling transmission part with the positioning rotary drilling part, and performing downward rotary drilling, so that the positioning rotary drilling part drills into the steep rock riverbed without an overburden layer; S3, disconnecting the rotary drilling transmission part from the positioning rotary drilling part, and connecting the rotary drilling transmission part to the hole-forming rotary drilling part, driving the hole-forming rotary drilling part to rotary drill downward along the positioning rotary drilling part until the installation hole is formed; S4. Remove the installation device, replace the slag drill bit to clean the hole, and complete the hole guiding work; S5. Install the steel casing in the installation hole and secure it after it is installed to the designed position; S6. Pour bottom sealing concrete into the installation hole.

[0014] In the preferred embodiment, a plurality of flow grooves are provided at equal intervals in an annular manner on the bottom of the steel casing; The specific method of pouring the bottom seal concrete in step S6 is: pouring the bottom seal concrete from the inside of the steel casing, so that the bottom seal concrete flows out along the bottom flow groove to the installation hole, the bottom seal concrete anchors the steel casing in the hole, and at the same time closes the flow groove, so that the bottom end of the steel casing forms a closed shape.

[0015] The present invention provides an underwater uncovered steep rock pile foundation steel casing installation device and an installation method thereof. The positioning rotary drilling part drills into the riverbed before the hole-forming rotary drilling part. During this process, since the positioning rotary drilling drill bit has a small diameter, a small working surface and a large pressure, it is not easy to slip on the steep rock surface without a covering layer, which can effectively improve the stability and positioning accuracy of the initial drilling hole. After completing the preliminary positioning, the rotary drilling transmission part is switched to connect to the hole-forming rotary drilling part, and the hole expansion operation is carried out along the formed guide hole, thereby forming an installation hole with good verticality and a bottom close to horizontal, which significantly improves the accuracy and construction quality of the steel casing installation, effectively solves the problems of easy curling, deviation and poor verticality of the bottom of the steel casing in traditional construction methods, realizes efficient and accurate hole-forming operations under complex geological conditions, and provides conditions for the installation of pile foundation steel casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and examples: Figure 1 It is the overall structural diagram of the installation device of the present invention; Figure 2 This invention Figure 1 Half-section structure diagram; Figure 3 This is an exploded view of the connection structure between the outer casing and the hole-forming rotary drilling part of the present invention; Figure 4 This invention Figure 3 A magnified view of the structure in the middle; Figure 5 This is an exploded view of the hole-forming rotary drilling part and the positioning rotary drilling part of the present invention; Figure 6 This is a half-section structural diagram of the rotary drilling transmission part of the present invention; Figure 7 This invention Figure 6 Structural diagram of the transmission connection assembly; Figure 8 This invention Figure 7 Middle B is an enlarged view of the structure; Figure 9 It is a structural diagram of the telescopic control assembly of the present invention; Figure 10 This is a structural diagram of the telescopic interference ring of the present invention; Figure 11 It is a structural diagram of the transmission rod of the present invention; Figure 12 is a positional relationship diagram of the first positioning sensor and the first positioning target portion of the present invention; Figure 13 is a position relationship diagram of the first contact sensor of the present invention; Figure 14 This is a schematic diagram of step S1 of the present invention; Figure 15 This is a schematic diagram of step S2 of the present invention; Figure 16 This invention Figure 15 Middle C structure magnification; Figure 17 This is a schematic diagram of step S3 of the present invention; Figure 18 This is a schematic diagram of step S5 of the present invention; Figure 19 It is a schematic diagram of step S6 of the present invention.

[0017] In the figure: outer sleeve 1; fixed block 101; first positioning sensor 102; first positioning target part 103; hole-forming rotary drilling part 2; lifting rod body 201; hole-forming rotary drilling bit 202; fixed groove 203; positioning rotary drilling part 3; positioning rotary drilling rod body 301; positioning rotary drilling bit 302; rotary drilling transmission part 4; transmission rod 40; receiving groove 41; telescopic card seat 42; telescopic opening 420; telescopic limit groove 421; wedge-shaped card block 422; limit plate 423; telescopic spring 4 24; telescopic control assembly 43; fixed ring 430; telescopic resistance ring 431; sliding block 4310; sliding groove 4311; downward pressure spring 432; contraction control part 433; outer sleeve 4330; telescopic cavity 4331; telescopic groove 4332; telescopic rod 4333; telescopic block 4334; electromagnet 4335; adsorption block 4336; second positioning sensor 44; second contact sensor 45; connecting part 5; slot 501; first contact sensor 502. DETAILED DESCRIPTION

[0018] Example 1 like Figure 1-13 As shown, an underwater uncovered steep rock pile foundation steel casing installation device comprises: an outer casing 1, a hole-forming rotary drilling part 2, a positioning rotary drilling part 3 and a rotary drilling transmission part 4, wherein the interior of the outer casing 1 is hollow and both ends are open.

[0019] The hole-forming rotary drilling part 2 includes a lifting rod body 201 movably inserted into the bottom end of the outer sleeve 1. The bottom end of the hole-forming rotary drilling rod body 201 is provided with a hole-forming rotary drilling bit 202 located outside the outer sleeve 1. Such a design allows the hole-forming rotary drilling rod body 201 to rotate and descend in the outer sleeve 1, thereby realizing the rotary drilling of the hole-forming rotary drilling bit 202.

[0020] The positioning rotary drilling part 3 includes a positioning rotary drilling rod body 301 that movably passes through the hole-forming rotary drilling part 2. A central hole is provided in the hole-forming rotary drilling part 2 for the rotary drilling rod body 301 to pass through. The positioning rotary drilling rod body 301 can be rotated and lowered in the hole-forming rotary drilling part 2. Its specific length is greater than the length of the hole-forming rotary drilling part 2. Its specific length can be adjusted according to its drilling length. The bottom end of the positioning rotary drilling rod body 301 is provided with a positioning rotary drilling drill bit 302 that passes through the hole-forming rotary drilling drill bit 202, so that the positioning rotary drilling rod body 301 can be used to rotate and descend in the hole-forming rotary drilling part 2, so that the positioning rotary drilling drill bit 302 enters the hole-forming rotary drilling part 2 first and drills into the riverbed. It should be noted that, if Figure 4 As shown, the diameter of the positioning rotary drilling bit 302 is smaller than the diameter of the hole forming rotary drilling bit 202 .

[0021] The rotary drilling transmission part 4 includes a transmission rod 40 that is movably inserted into the outer sleeve 1 from the top. The top of the transmission rod 40 is connected to the drill rod of the rotary drilling machine. The specific connection method adopts the existing method of connecting the drill rod and the drill bit, so it is not further described here. The bottom end of the transmission rod 40 is provided with a receiving groove 41 that can accommodate the positioning rotary drilling rod body 301. The notch of the receiving groove 41 is provided with a transmission connection assembly for connecting the hole-forming rotary drilling part 2 or the positioning rotary drilling part 3, wherein the receiving groove 41 facilitates the rotary drilling transmission part 4 to control the hole-forming rotary drilling part 2 for rotary drilling, and to accommodate the positioning rotary drilling part 3 to prevent collision with it.

[0022] With such a design, when installing a steel casing on a steep rock riverbed without an overburden layer, the installation device in this embodiment can be used to open a mounting hole 6 with a bottom that is nearly horizontal on the riverbed, and in this process, the positioning rotary drilling part 3 is connected to the rotary drilling transmission part 4, so that the positioning rotary drilling part 3 is drilled into the riverbed before the hole-forming rotary drilling part 2. Since the diameter of the positioning rotary drilling drill bit 302 is small, its active surface is small during operation, the active surface is relatively flat, the pressure on the rock surface is large, and the slippage is small. After the rotary drilling reaches the preset depth, the connection between the rotary drilling transmission part 4 and the positioning rotary drilling part 3 is released, and the rotary drilling transmission part 4 is connected to the hole-forming rotary drilling part 2, and the rotary drilling along the positioning rotary drilling part 3 is rotated to the preset depth of the riverbed, effectively avoiding the slippage caused by the relatively complex active surface due to its large active surface, thereby forming a vertical mounting hole 6 with a bottom that is nearly horizontal on the steep rock riverbed without an overburden layer, which is convenient for the installation of the steel casing.

[0023] Furthermore, a releasable fixing assembly is provided between the lifting rod body 201 and the outer sleeve 1 for fixing the initial height of the hole-forming rotary drilling part 2 to avoid unnecessary sliding of the hole-forming rotary drilling part 2 during the rotary drilling process of the positioning rotary drilling part 3.

[0024] Among them, the fixing component specifically includes a plurality of fixing grooves 203 in a circular array on the outside of the top end of the lifting rod body 201. In this embodiment, the number of the fixing grooves 203 is three, and the fixing grooves 203 are in the shape of an inverted "L". A fixing block 101 corresponding to the fixing groove 203 is provided on the inner wall of the outer sleeve 1. With such a design, the lifting rod body 201 and the outer sleeve 1 can be locked or unlocked through the cooperation of lifting and rotating.

[0025] In addition, a bell mouth 204 is provided at the entrance of the fixing groove 203 to facilitate the entry of the fixing block 101 into the fixing groove 203 .

[0026] In order to achieve alignment between the above-mentioned fixing groove 203 and the fixing block 101, a first positioning sensor 102 is embedded in the bottom of the fixing block 101, and a first positioning target part 103 corresponding to the first positioning sensor 102 is embedded in the fixing groove 203. The positioning between the first positioning sensor 102 and the first positioning target part 103 is achieved, thereby facilitating the connection between the two. At the same time, the embedded design avoids affecting the connection process between the two.

[0027] In this embodiment, the first positioning sensor 102 and the first positioning target portion 103 may be a visual positioning sensor or a laser positioning sensor, which may be a common commercially available product currently on the market. In the preferred embodiment, the top ends of the lifting rod body 201 and the positioning rotary drilling rod body 301 are both provided with a connecting portion 5 connected to the transmission connection assembly, wherein the connecting portion 5 at the top of the lifting rod body 201 is annular, so as to avoid affecting the extension and retraction of the positioning rotary drilling portion 3, and the two connecting portions 5 have the same outer diameter and can be inserted into the accommodating groove 41, so as to facilitate the connection of the transmission connection assembly therewith, and the outer annular array of the connecting portion 5 has multiple card slots 501. In this embodiment, the number of the card slots 501 is four.

[0028] In the preferred embodiment, the transmission connection assembly includes a plurality of telescopic seats 42 and a telescopic control assembly 43 in a circular array. The number of telescopic seats 42 corresponds to the slot 501 on a single connecting part 5. The telescopic control assembly 43 is arranged on the outside of the transmission rod 40 and is used to control the connection relationship between the telescopic seat 42 and the slot 501.

[0029] Furthermore, the telescopic card seat 42 includes a telescopic opening 420 arranged on the card slot 501 and passing through the transmission rod 40, and telescopic limit grooves 421 are symmetrically arranged on the upper and lower sides of the telescopic opening 420. A wedge-shaped card block 422 is provided in the telescopic opening 420, and the front end of the wedge-shaped card block 422 can be inserted into and out of the transmission rod 40. The upper and lower ends of the wedge-shaped card block 422 are provided with limit plates 423 that slide with the telescopic limit groove 421. The telescopic limit groove 421 is also provided with a telescopic spring 424 that contacts the limit plate 423, which is used to keep the front end of the wedge-shaped card block 422 in a state of being inserted out.

[0030] Such a design allows the wedge-shaped block 422 to penetrate into and out of the transmission rod 40 under the restriction of the limit plate 423 and the telescopic limit groove 421, so that when penetrating, it can form a locking relationship with the corresponding card slot 501, and under the action of the telescopic spring 424, it can maintain the initial state of penetration and quickly reset after unlocking.

[0031] It should be noted that the front end of the wedge-shaped clamping block 422 is adapted to the size of the clamping slot 501 , so that the wedge-shaped clamping block 422 can be inserted into the clamping slot 501 to realize the transmission connection of the rotation and lifting functions.

[0032] In order to know the connection status between the card slot 501 and the first contact sensor 502, a first contact sensor 502 is embedded in the card slot 501, which is used to sense the connection status of the wedge-shaped card block 422 and the first contact sensor 502. In this embodiment, the first contact sensor 502 is a pressure sensor, which knows the connection status of the two through the pressure generated when the wedge-shaped card block 422 contacts the first contact sensor.

[0033] In the preferred embodiment, the telescopic control assembly 43 includes a fixed ring 430 and a telescopic interference ring 431. The fixed ring 430 is fixed to the outside of the transmission rod 40, and the telescopic interference ring 431 can be slid up and down on the outside of the transmission rod 40. Specifically, the outer annular array of the transmission rod 40 has multiple sliding grooves 4311. In this embodiment, the number of sliding grooves 4311 is four. The inner side of the telescopic interference ring 431 is provided with a sliding block 4310 that slides with the sliding groove 4311. The inner side of the telescopic interference ring 431 is provided with a wedge-shaped groove that is compatible with the wedge-shaped block 422. A plurality of downward pressure springs 432 and contraction control parts 433 are staggered between the fixed ring 430 and the telescopic interference ring 431. In this embodiment, the number of downward pressure springs 432 and contraction control parts 433 are both six.

[0034] It should be noted that the elastic coefficient of the downward pressing spring 432 is greater than the elastic coefficient of the telescopic spring 424 . Meanwhile, when the telescopic contact ring 431 slides to the bottom, the wedge-shaped block 422 is completely engaged with the slot 501 .

[0035] With such a design, when the telescopic resistance ring 431 slides down under the tension of the downward pressure spring 432, the front end of the wedge-shaped block 422 can be inserted into the transmission rod 40 through the resistance relationship between the telescopic resistance ring 431 and the wedge-shaped block 422. At the same time, the telescopic resistance ring 431 can be retracted upward through the contraction control part 433, thereby releasing the pressure applied to the wedge-shaped block 422, causing it to reset under the action of the telescopic spring 424, and releasing the engagement relationship with the card slot 501.

[0036] Furthermore, the contraction control part 433 includes an outer sleeve 4330 arranged at the bottom of the fixed ring 430, and a telescopic cavity 4331 with an open bottom is provided in the outer sleeve 4330, and two telescopic grooves 4332 are symmetrically provided on the inner wall of the telescopic cavity 4331. A telescopic rod 4333 with a top movably inserted into the outer sleeve 4330 is provided at the top of the telescopic resistance ring 431, and a telescopic block 4334 slidingly engaged with the telescopic groove 4332 is provided at the top of the telescopic rod 4333. An electromagnet 4335 is provided on the inner top wall of the outer sleeve 4330, and an adsorption block 4336 is provided at the top of the telescopic rod 4333.

[0037] With such a design, the telescopic rod 4333 can be extended and retracted under the restriction of the telescopic block 4334 and the telescopic slot 4332, and the adsorption block 4336 is adsorbed by the electromagnet 4335, and the telescopic resistance ring 431 is retracted by the telescopic rod 4333. At the same time, after the electromagnet 4335 is turned off, the telescopic resistance ring 431 can be pressed down by the downward pressure spring 432, thereby realizing the control of the telescopic seat 42.

[0038] In the preferred embodiment, in order to achieve the height positioning of the transmission connection assembly connecting the positioning rotary drilling part 3 and the hole-forming rotary drilling part 2, a second positioning target part 502 is provided at the top center of the connecting part 5 on the positioning rotary drilling part 3, and a second positioning sensor 44 for positioning the second positioning target part 502 is embedded in the inner wall of the accommodating groove 41. When the second positioning target part 502 matches the second positioning sensor 44, the transmission connection assembly matches the height of the connecting part 5 on the positioning rotary drilling part 3.

[0039] In this embodiment, the second positioning target part 502 and the second positioning sensor 44 can be one of visual positioning or laser positioning sensors. For example, when a laser positioning sensor is used, the second positioning target part 502 is a 360-degree prism. Therefore, the positioning of the second positioning target part 502 and the second positioning sensor 44 can be used to achieve height matching between the transmission connection assembly and the connection part 5 on the positioning rotary drilling part 3.

[0040] In addition, a second contact sensor 45 is provided at the bottom end of the transmission rod 40. In this embodiment, the second contact sensor 45 is a pressure sensor. When the second contact sensor 45 contacts the top of the hole-forming rotary drilling part 2, the transmission connection assembly matches the height of the connection part 5 on the hole-forming rotary drilling part 2.

[0041] With such a design, the transmission connection assembly can be positioned to a height connected to the positioning rotary drilling part 3 or the hole-forming rotary drilling part 2, and then the contracted state of the contraction control part 433 is released. Through the rotation and downward pressure of the spring 432, when the wedge-shaped block 422 rotates to the slot 501, the connection between the two is completed.

[0042] It should be noted that the above-mentioned electronic components realize rotational power supply through electric slip rings, which is a prior art in the field and thus will not be described in detail here.

[0043] Example 2 Further illustrate with reference to Example 1, Figure 14-19 The structure shown is an installation method for an underwater uncovered steep rock pile foundation steel casing installation device, the method comprising: S1. Fix the top of the outer sleeve 1 on the construction platform at the steel casing installation position and ensure that it is in a vertical state. Then connect the top of the rotary drilling transmission part 4 to the drill rod of the rotary drilling machine.

[0044] S2. Connect the rotary drilling transmission part 4 to the positioning rotary drilling part 3, and perform downward rotary drilling to allow the positioning rotary drilling part 3 to drill into the steep rock riverbed without an overburden layer.

[0045] S3, release the connection between the rotary drilling transmission part 4 and the positioning rotary drilling part 3, and connect the rotary drilling transmission part 4 with the hole-forming rotary drilling part 2, drive the hole-forming rotary drilling part 2 to rotary drill downward along the positioning rotary drilling part 3 until the installation hole 6 is formed, and the depth of the installation hole 6 reaches more than 1m below the lowest point of the riverbed around the casing.

[0046] S4. Remove the installation device, replace the slag drill bit to clean the hole, and complete the hole guiding work.

[0047] S5. Install the steel casing 7 in the installation hole 6 and fix it after it is installed to the designed position.

[0048] S6. Pour bottom sealing concrete 9 into the installation hole 6.

[0049] In the preferred embodiment, a plurality of flow grooves 8 are provided at equal intervals in an annular manner at the bottom of the steel casing 7; The specific method of pouring the bottom seal concrete 9 in step S6 is: pouring the bottom seal concrete 9 from the inside of the steel casing 7, so that the bottom seal concrete 9 flows out along the bottom flow groove 8 to the mounting hole 6, and the bottom seal concrete 9 anchors the steel casing 7 in the hole and closes the flow groove 8 at the same time, so that the bottom end of the steel casing 7 forms a closed shape.

[0050] It should be noted that during the pouring of the bottom concrete 9, three sets of measuring ropes are used to measure the height of the concrete inside and outside the hole. Since the flow grooves 8 are evenly arranged, the progress of the concrete overflow on the outside of the steel casing 7 should be the same. When the progress of the concrete overflow on the outside of the steel casing 7 is different, it may be that there is a blockage at the bottom. After the pouring is completed, the top elevation of the concrete around the steel casing 7 should be the same.

[0051] This method is suitable for construction in various steep rock and hard rock environments. Its core lies in the hierarchical rotary drilling of the positioning rotary drilling part 3 and the hole-forming rotary drilling part 2, which customizes two standard cross-sections and realizes the functions of drill bit positioning and hole expansion on steep rock. The steel casing 7 is anchored in the riverbed by the bottom concrete, which can ensure the plane position and verticality of the pile foundation and thus ensure the quality of the pile foundation. In addition, the tooling involved in the present invention has low difficulty in manufacturing and does not involve additional engineering machinery in the traditional pile foundation construction process. The construction efficiency and quality are guaranteed under the condition of using the same mechanical equipment.

[0052] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. Underwater uncovered steep rock pile foundation steel casing installation device, its characteristics are: include: An outer sleeve (1) having a hollow interior and openings at both ends; A hole-forming rotary drilling part (2) comprises a lifting rod body (201) movably inserted into the bottom end of the outer sleeve (1); the bottom end of the hole-forming rotary drilling rod body (201) is provided with a hole-forming rotary drilling bit (202) located outside the outer sleeve (1); A positioning rotary drilling part (3) includes a positioning rotary drilling rod (301) that movably penetrates the hole-forming rotary drilling part (2), and a positioning rotary drilling drill bit (302) that passes through the hole-forming rotary drilling drill bit (202) is provided at the bottom end of the positioning rotary drilling rod (301); The rotary drilling transmission part (4) comprises a transmission rod (40) movably inserted into the outer sleeve (1) from the top, the top of the transmission rod (40) being connected to the drill rod of the rotary drilling machine, the bottom of the transmission rod (40) being provided with a receiving groove (41) capable of receiving a positioning rotary drilling rod body (301), and a transmission connection assembly being provided at the notch of the receiving groove (41) for connecting to the hole-forming rotary drilling part (2) or the positioning rotary drilling part (3).

2. The underwater uncovered steep rock pile foundation steel casing installation device according to claim 1 is characterized by: A releasable fixing assembly is provided between the lifting rod body (201) and the outer sleeve (1) for fixing the initial height of the hole-forming rotary drilling part (2); The fixing assembly includes a plurality of fixing grooves (203) arranged in an annular array on the outside of the top end of the lifting rod body (201), the fixing grooves (203) being in the shape of an inverted "L", and a fixing block (101) corresponding to the fixing grooves (203) being provided on the inner wall of the outer sleeve (1); A bell mouth (204) is provided at the entrance of the fixing groove (203); A first positioning sensor (102) is embedded in the bottom of the fixed block (101), and a first positioning target portion (103) corresponding to the first positioning sensor (102) is embedded in the fixed groove (203).

3. The underwater uncovered steep rock pile foundation steel casing installation device according to claim 1 is characterized by: The top ends of the lifting rod body (201) and the positioning rotary drilling rod body (301) are both provided with a connecting portion (5) connected to the transmission connecting assembly, wherein the connecting portion (5) at the top of the lifting rod body (201) is annular, and the two connecting portions (5) have the same outer diameter and can be inserted into the accommodating groove (41), and the outer annular array of the connecting portion (5) has a plurality of slots (501).

4. The underwater uncovered steep rock pile foundation steel casing installation device according to claim 3 is characterized by: The transmission connection assembly comprises a plurality of telescopic card seats (42) in an annular array and a telescopic control assembly (43), wherein the number of the telescopic card seats (42) corresponds to the card slots (501) on a single connection portion (5), and the telescopic control assembly (43) is arranged outside the transmission rod (40) and is used to control the connection relationship between the telescopic card seats (42) and the card slots (501).

5. The underwater uncovered steep rock pile foundation steel casing installation device according to claim 4 is characterized by: The telescopic card seat (42) includes a telescopic opening (420) provided on the card slot (501) and penetrating the transmission rod (40), telescopic limiting grooves (421) symmetrically provided on the upper and lower sides of the telescopic opening (420), a wedge-shaped card block (422) with a front end capable of passing through the transmission rod (40) is provided in the telescopic opening (420), limiting plates (423) slidably engaged with the telescopic limiting groove (421) are provided at both the upper and lower ends of the wedge-shaped card block (422), and a telescopic spring (424) is further provided in the telescopic limiting groove (421) to abut against the limiting plate (423) for keeping the front end of the wedge-shaped card block (422) in a state of passing out; A first contact sensor (502) is embedded in the card slot (501) and is used to sense the connection status between the wedge-shaped card block (422) and the card slot.

6. The underwater uncovered steep rock pile foundation steel casing installation device according to claim 5 is characterized by: The telescopic control assembly (43) includes a fixed ring (430) and a telescopic contact ring (431), wherein the fixed ring (430) is fixedly arranged on the outside of the transmission rod (40), and the telescopic contact ring (431) is arranged on the outside of the transmission rod (40) so as to be slidable up and down. A wedge-shaped groove that matches the wedge-shaped block (422) is provided on the inner side of the telescopic contact ring (431), and a plurality of downward pressure springs (432) and a contraction control portion (433) are staggered between the fixed ring (430) and the telescopic contact ring (431); The outer annular array of the transmission rod (40) has a plurality of sliding grooves (4311), and the inner side of the telescopic contact ring (431) is provided with a sliding block (4310) that is slidably engaged with the sliding grooves (4311).

7. The underwater uncovered steep rock pile foundation steel casing installation device according to claim 6 is characterized by: The contraction control part (433) includes an outer sleeve (4330) arranged at the bottom of the fixed ring (430), a telescopic cavity (4331) with an open bottom is arranged in the outer sleeve (4330), two telescopic grooves (4332) are symmetrically arranged on the inner wall of the telescopic cavity (4331), a telescopic rod (4333) with a top movably inserted into the outer sleeve (4330) is arranged at the top of the telescopic contact ring (431), a telescopic block (4334) slidingly engaged with the telescopic groove (4332) is arranged at the top of the telescopic rod (4333), an electromagnet (4335) is arranged on the inner top wall of the outer sleeve (4330), and an adsorption block (4336) is arranged at the top of the telescopic rod (4333).

8. The underwater uncovered steep rock pile foundation steel casing installation device according to claim 7 is characterized by: A second positioning target portion (502) is provided at the top center of the connecting portion (5) on the positioning rotary drilling portion (3), and a second positioning sensor (44) for positioning the second positioning target portion (502) is embedded in the inner wall of the accommodating groove (41); when the second positioning target portion (502) matches the second positioning sensor (44), the height of the transmission connection assembly matches that of the connecting portion (5) on the positioning rotary drilling portion (3); A second contact sensor (45) is provided at the bottom end of the transmission rod (40). When the second contact sensor (45) contacts the top of the hole-forming rotary excavation part (2), the height of the transmission connection assembly matches the height of the connection part (5) on the hole-forming rotary excavation part (2).

9. The method for installing the underwater uncovered steep rock pile foundation steel casing installation device according to any one of claims 1 to 8, characterized in that: The method includes: S1. Fix the top of the outer casing (1) on the construction platform at the installation position of the steel casing and ensure that it is in a vertical state, and then connect the top of the rotary drilling transmission part (4) to the drill rod of the rotary drilling machine; S2, connecting the rotary drilling transmission part (4) with the positioning rotary drilling part (3), and performing downward rotary drilling, so that the positioning rotary drilling part (3) is drilled into the steep rock riverbed without an overburden layer; S3, releasing the connection between the rotary drilling transmission part (4) and the positioning rotary drilling part (3), and connecting the rotary drilling transmission part (4) to the hole-forming rotary drilling part (2), driving the hole-forming rotary drilling part (2) to rotary drill downward along the positioning rotary drilling part (3) until the mounting hole (6) is formed; S4. Remove the installation device, replace the slag drill bit to clean the hole, and complete the hole guiding work; S5. Install the steel casing (7) in the installation hole (6) and fix it after it is installed to the designed position; S6. Pour bottom sealing concrete (9) into the installation hole (6).

10. The method for installing the underwater uncovered steep rock pile foundation steel casing installation device according to claim 8, characterized in that: The bottom of the steel casing (7) is provided with a plurality of flow grooves (8) at equal intervals in an annular manner; The specific method of pouring the bottom seal concrete (9) in step S6 is as follows: pouring the bottom seal concrete (9) from the inside of the steel casing (7) so that the bottom seal concrete (9) flows out along the bottom flow groove (8) into the installation hole (6), and the bottom seal concrete (9) anchors the steel casing (7) in the hole and closes the flow groove (8) at the same time, so that the bottom end of the steel casing (7) forms a closed shape.

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