Method for embedding deep-layer horizontal displacement inclinometer pipe in causeway intertidal zone drilling

Abstract

The invention discloses a method for embedding a deep horizontal displacement inclinometer pipe in a causeway intertidal zone drilling hole, which comprises the following steps: before hydraulic reclamation construction, a drilling machine is used for leading a hole into a causeway body to follow up a casing pipe, a riprap layer, a sand bag layer and a sludge soft soil layer at the upper part of the causeway are separated, and a drilling hole at the lower part of the casing pipe is subjected to wall protection and hole cleaning by using bentonite slurry; after drilling is completed, inclinometer pipes are installed, and the inclinometer pipes are placed in the drill hole section by section; then a vibrating rod and a vibrating guide pipe are placed in the inclinometer pipe, and a motor is started to enable the vibrating rod to drive the inclinometer pipe to keep vibrating; then, the melon seed stone is slowly poured into a gap between the inclinometer pipe and the drill hole, the vibrating rod is gradually lifted along with the filling depth of the melon seed stone, the melon seed stone is filled and compacted, and therefore the gap in the hole is eliminated, the inclinometer pipe and the soil body of the embankment body are synchronously deformed, and the displacement change condition of the embankment in the hydraulic reclamation construction period is accurately reflected; and finally, the horizontal displacement change of the deep layer is observed through the inclinometer, so that the real displacement condition in the hydraulic reclamation construction period is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of sea reclamation in water transport engineering, and in particular relates to a method for drilling holes in the intertidal zone of a levee and burying deep-layer horizontal displacement inclinometer tubes. Background Art

[0002] Land reclamation from the sea is used for urban construction and industrial and agricultural production, which can effectively alleviate the contradiction between economic development and insufficient construction land. The dike is a prerequisite for land reclamation by filling. The water and soil pressure on the inner side of the dike is too large due to filling construction. In addition, the lower silty soft soil layer fails to achieve a high consolidation, forming shear force, which can easily cause landslide accidents. Therefore, the deep horizontal displacement of the dike is an important monitoring indicator for the filling construction process and soft foundation treatment. The accuracy of its monitoring data can reflect the deformation development law of the dike, which is crucial to ensure the safety of the dike. Today, the structure of the dike is usually composed of a lower sand blanket + an upper riprap. The deep horizontal displacement monitoring requires drilling to the bearing layer, placing and installing an inclinometer in the hole, and measuring the deep horizontal displacement of the dike to the outside through the inclinometer. At present, the deep horizontal displacement of the dike has the following problems:

[0003] For large-scale land reclamation projects, the displacement of the embankment is relatively large. Boring and burying inclinometer tubes will easily form gaps in the holes, which will cause large measurement errors. At the same time, the horizontal displacement monitoring data of the embankment will be greatly affected and cannot truly reflect the changing patterns during the construction period. This poses a major hidden danger to the safety of land reclamation construction.

[0004] The gap between the borehole and the inclinometer tube is difficult to silt up in a short period of time, and due to the erosion of seawater in the intertidal zone, a mixture of sand and silty soil will form in the gap, which can easily form "spring soil" with low strength, causing the inclinometer tube to sway naturally in the hole. Even if it is filled later, it is difficult to repair, resulting in unstable monitoring data. It is difficult to distinguish the trend of deep horizontal displacement of the embankment, posing a huge safety hazard.

[0005] Therefore, in order to solve the problems existing in the process of burying and monitoring deep horizontal displacement in the above-mentioned dike project, it is urgent to propose a method for drilling and burying deep horizontal displacement inclinometer tubes in the intertidal zone of the dike. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for drilling holes and burying deep horizontal displacement inclinometer tubes in the intertidal zone of a levee.

[0007] The present invention is achieved through the following technical solutions:

[0008] A method for drilling and burying a deep horizontal displacement inclinometer tube in an intertidal zone of a dike comprises the following steps:

[0009] Step 1: Before the filling construction, a drilling rig is used to drill a hole in the embankment and insert a casing to separate the riprap layer, sandbag layer and silty soft soil layer on the upper part of the embankment. The lower part of the casing is drilled with bentonite slurry to protect the wall and clean the hole;

[0010] Step 2: After the drilling is completed, install the inclinometer tube, place the inclinometer tube section by section in the borehole, connect each section of the inclinometer tube with a matching pipe clamp, and apply polyurethane sealant on the outer wall of the inclinometer tube at the connection;

[0011] Step 3, placing a vibrating rod and a vibration guide tube in the inclinometer tube, and turning on the motor to make the vibrating rod drive the inclinometer tube to keep vibrating;

[0012] Step 4, slowly pour the melon seed stone into the gap between the inclinometer tube and the borehole, let the vibrator gradually rise with the depth of the melon seed stone, fill and compact the melon seed stone, thereby eliminating the gap in the hole, so as to make the inclinometer tube and the embankment body deform synchronously, so as to accurately reflect the displacement change of the embankment during the filling construction;

[0013] Step 5: Observe the changes in deep horizontal displacement using an inclinometer to obtain the actual displacement during the filling construction period.

[0014] In the above technical solution, the casing passes through the soft soil layer to prevent the soft soil layer from collapsing and causing the melon seed stones to be unable to be poured in. The bentonite slurry is selected to protect the wall of the lower drilling hole of the casing.

[0015] In the above technical solution, the diameter of the sleeve is 127 mm or 146 mm.

[0016] In the above technical solution, the particle size of the melon seed stone is 5mm to 10mm.

[0017] In the above technical solution, four surfaces of the pipe clamp which are circumferentially spaced 90° apart are respectively fixed with a plurality of longitudinally distributed self-tapping screws.

[0018] In the above technical solution, the inclinometer pipe is buried to the bottom of the hole, and the pipe material of the inclinometer pipe is ABS type pipe with equal wall thickness.

[0019] In the above technical solution, the vibrating rod probe has a diameter of 50 mm.

[0020] The advantages and beneficial effects of the present invention are:

[0021] 1. In view of the problem of unstable monitoring data of deep horizontal displacement of the embankment, the filling materials and filling methods of the boreholes should be improved. After the inclinometer tube is buried, the inclinometer tube will not be completely covered by the voids or fluid "spring soil" in the hole, and will be affected by the tidal scouring of seawater, causing the inclinometer tube to shake naturally in the hole, resulting in the inability of the inclinometer tube to synchronize with the deformation of the embankment, causing the measured displacement value to be erratic and irregular, and unable to accurately monitor the actual displacement changes of the embankment. The overall safety and stability of the embankment filling construction period are improved.

[0022] 2. The new deep horizontal displacement inclinometer tube burial method is simple and has low material cost. It solves the problem of inaccurate displacement monitoring data of the dike and the problem of scouring of the borehole filling material by the rising and falling tides in the intertidal zone. It does not require repeated filling at a later time and has good application and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of burying the inclinometer tube for deep horizontal displacement of the dike of the present invention.

[0024] Figure 2 The present invention Figure 1 Schematic diagram of the AA section structure.

[0025] Figure 3 The present invention Figure 1 Schematic diagram of the BB section structure (the inclinometer tube is buried).

[0026] Figure 4 The present invention Figure 1 Schematic diagram of the cross-sectional structure in the middle BB direction (pouring melon seed stone and vibrator).

[0027] Figure 5 It is a schematic diagram of the installation of the inclinometer pipe connection of the present invention.

[0028] In the figure:

[0029] 1. Drilling rig, 2. Drill hole, 3. Casing, 4. Inclinometer tube, 5. Bentonite slurry, 6. Melon seed stone, 7. Electric motor, 8. Vibrating guide tube, 9. Vibrating rod, 4-1. Pipe clamp, 4-2. Polyurethane sealant, 4-3. Self-tapping screws.

[0030] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0032] A method for drilling and burying a deep horizontal displacement inclinometer tube in the intertidal zone of a dike. The principle is that the inner side of the dike is displaced outward under the influence of the pressure of the blown fill soil, the inclinometer tube is displaced synchronously with the dike, and the inclination changes of the inclinometer tube at different depths in each period are measured by an inclinometer.

[0033] Before the construction of land reclamation, an inclinometer tube 4 should be buried in the dike to measure the initial value of the deep horizontal displacement of the dike; during the process of drilling with the crawler drill 1, the casing 3 should be followed to below the silt soft soil layer to isolate the riprap layer, sandbag layer and silt soft soil layer on the upper part of the dike, and the lower borehole 2 of the casing 3 should be protected with bentonite slurry 5 and the hole should be cleaned. After drilling to the designed depth, the inclinometer tube 4 is installed and placed in the borehole section by section. The sections of the inclinometer tube 4 need to be connected with matching pipe clamps 4-1, and the outer wall of the inclinometer tube 4 needs to be coated with polyurethane sealant 4-2 at the connection. The four faces of the pipe clamp 4-1 with a circumferential interval of 90° are fixed with four longitudinally distributed self-tapping screws 4-3. Then, the vibrator 9 and the vibration guide tube 8 are placed in the inclinometer tube, and the motor 7 is turned on to make the vibrator 9 drive the inclinometer tube 4 to keep vibrating. Afterwards, slowly pour the melon seed stone 6 into the gap between the inclinometer tube 4 and the borehole 2, and let the vibrator 9 gradually rise with the depth of the melon seed stone 6, fill and compact the melon seed stone 4, eliminate the gap in the hole, so that the inclinometer tube 4 and the embankment soil can deform synchronously, accurately reflecting the displacement change.

[0034] In the above technical solution, the casing 3 needs to pass through the soft soil layer to prevent the soft soil layer from collapsing and causing the melon seed stone 6 to be unable to be poured in. The lower drilling hole 2 of the casing is protected by bentonite slurry 5. The diameter of the casing 3 is usually 127mm or 146mm. The specific gravity of the slurry is 1.3g / cm 3 .

[0035] In the above technical solution, the inclinometer tube 4 should be buried to the bottom of the hole. The inclinometer tube is made of ABS type or other thick-walled tube, with a maximum outer diameter of about 70 mm and an inner diameter of 60 mm.

[0036] In the above technical solution, the particle size of the melon seed stone is 5mm to 10mm.

[0037] In the above technical solution, the diameter of the vibrating rod 5 is 50 mm, the length of the vibrating guide tube 8 is controlled according to the depth of the inclinometer tube 4, and the inclinometer tube 4 is kept vibrating while the melon seed stone 6 is poured in, and the inclinometer tube 4 is compacted and filled.

[0038] In summary, the method for drilling holes and burying deep horizontal displacement inclinometer tubes in the intertidal zone of the embankment of the present invention comprises the following steps:

[0039] Step 1, before the filling construction, use a drilling rig 1 to drill a hole in the embankment body and follow up with a casing 3 to isolate the riprap layer, sandbag layer and silty soft soil layer on the upper part of the embankment, and use bentonite slurry 5 to protect the wall of the borehole 2 below the casing 3 and clean the hole;

[0040] Step 2, after the drilling 2 is completed, the inclinometer tube 4 is installed, and the inclinometer tube 4 is placed in the drilled hole section by section. Each section of the inclinometer tube 4 needs to be connected with a matching pipe clamp 4-1, and the outer wall of the inclinometer tube 4 needs to be coated with polyurethane sealant 4-2 at the connection;

[0041] Step 3, placing the vibrating rod 9 and the vibrating guide tube 8 in the inclinometer tube 4, turning on the motor 7 to make the vibrating rod 9 drive the inclinometer tube to keep vibrating;

[0042] Step 4, slowly pour the melon seed stone 6 into the gap between the inclinometer tube 4 and the borehole 2, and gradually raise the vibrator 9 as the melon seed stone 6 is poured into the hole, so as to fill and compact the melon seed stone 4, thereby eliminating the gap in the hole, so that the inclinometer tube 4 and the embankment body soil can maintain good synchronous deformation, and accurately reflect the displacement change of the embankment during the filling construction;

[0043] Step 5: Observe the changes in deep horizontal displacement using an inclinometer to obtain the actual displacement during the filling construction period.

[0044] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. A method for drilling and burying deep horizontal displacement inclinometer tubes in the intertidal zone of a dike, characterized in that: The following steps are involved: Step 1: Before the filling construction, a drilling rig is used to drill a hole in the embankment and insert a casing to separate the riprap layer, sandbag layer and silty soft soil layer on the upper part of the embankment. The lower part of the casing is drilled with bentonite slurry to protect the wall and clean the hole; Step 2: After the drilling is completed, install the inclinometer tube, place the inclinometer tube section by section in the borehole, connect each section of the inclinometer tube with a matching pipe clamp, and apply polyurethane sealant on the outer wall of the inclinometer tube at the connection; Step 3, placing a vibrating rod and a vibration guide tube in the inclinometer tube, turning on the motor so that the vibrating rod drives the inclinometer tube to keep vibrating; Step 4, slowly pour the melon seed stone into the gap between the inclinometer tube and the borehole, let the vibrator gradually rise with the depth of the melon seed stone, fill and compact the melon seed stone, thereby eliminating the gap in the hole, so as to make the inclinometer tube and the embankment body deform synchronously, so as to accurately reflect the displacement change of the embankment during the filling construction; Step 5: Observe the changes in deep horizontal displacement using an inclinometer to obtain the actual displacement during the filling construction period.

2. The method for drilling and burying deep horizontal displacement inclinometer tubes in the intertidal zone of the dike according to claim 1, characterized in that: The casing passes through the soft soil layer to prevent the soft soil layer from collapsing and causing the melon seed stones to be unable to be poured in. The lower drilling hole of the casing is selected to use bentonite slurry to protect the wall.

3. The method for drilling and burying deep horizontal displacement inclinometer tubes in the intertidal zone of the dike according to claim 1, characterized in that: The casing diameter is 127mm or 146mm.

4. The method for drilling and burying deep horizontal displacement inclinometer tubes in the intertidal zone of the dike according to claim 1, characterized in that: The particle size of melon seed stone is 5mm~10mm.

5. The method for drilling and burying deep horizontal displacement inclinometer tubes in the intertidal zone of the dike according to claim 1, characterized in that: The four surfaces of the pipe clamp which are spaced 90 degrees apart in the circumferential direction are fixed by a plurality of longitudinally distributed self-tapping screws.

6. The method for drilling and burying deep horizontal displacement inclinometer tubes in the intertidal zone of the dike according to claim 1, characterized in that: The inclinometer tube is buried to the bottom of the hole, and the tube material of the inclinometer tube is ABS type tube with equal wall thickness.

7. The method for drilling and burying deep horizontal displacement inclinometer tubes in the intertidal zone of the dike according to claim 1, characterized in that: The vibrating rod probe has a diameter of 50 mm.

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