Auxiliary tool arranged below long pile casing

Abstract

The utility model discloses an auxiliary tool for downward arrangement of a long pile casing, which comprises a square head driver, a casing pipe is fixedly arranged at the bottom of the square head driver, a bottom casing pipe is arranged at the bottom of the casing pipe, a male joint is fixedly mounted at the top of the bottom casing pipe, and cutting teeth are fixedly mounted at the bottom of the bottom casing pipe. The top of the casing pipe is fixedly provided with a male connector, and the bottom of the casing pipe is fixedly provided with a female connector. According to the auxiliary tool arranged below the long pile casing, when the pile casing is arranged below the large-diameter sleeve, disturbance of the long pile casing to surrounding stratums, graded broken stones and a cement paste layer is reduced, and the horizontal bearing capacity of a pile foundation can be brought into play; the problem that the long pile casing is difficult to arrange is effectively solved, and the efficiency of arranging the long pile casing is improved. Meanwhile, the phenomena of hole collapse, slurry leakage and drill burying are greatly avoided, the construction efficiency is improved, the construction safety is guaranteed, and the construction cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of casing installation, in particular to an auxiliary tool for installing a long casing. Background Art

[0002] In the construction of this project, the construction content includes the replacement of the site in the tank area, temporary road construction, tank pile foundation construction and cushion construction. There are two tanks in total, 800 concrete bored piles with a diameter of 1.5m, and an average pile length of about 73.9 meters. The "high-cap pile" one-time forming construction process is adopted. The site is a riprap backfill site with an average backfill depth of 7 meters.

[0003] The construction site is a riprap backfill site and has not been compacted. The backfill soil is loose and not dense, the backfill layer is thick, and the average depth is 7 meters. The groundwater level is at a shallow position of 3 meters. During the drilling process, a long casing needs to be laid. The maximum particle size of the backfill block can reach 500mm. During the installation of the casing, there are situations such as large backfill stones getting stuck in the casing and stones collapsing, making it difficult to install the casing. Secondly, the tank area is replaced with graded crushed stone + cement slurry. Before drilling, clay is used as a slow slurry pool cofferdam, and excavation is not allowed to damage the backfill layer.

[0004] In order to prevent leakage, hole collapse and buried drill during the hole forming process, a 7.5-meter-long casing is required to enable it to pass through the backfill area. If the traditional construction method is used when setting up the casing, the drilling efficiency is low when using a pick-shaped barrel drill, and it is impossible to avoid the collapse of the hole caused by the falling of stones. At the same time, it will cause the phenomenon of over-squareness, which greatly increases the construction cost in terms of construction efficiency and raw material consumption and brings construction safety hazards.

[0005] To this end, the utility model provides an auxiliary tool for setting up a long casing, which adopts a customized casing and tooling with the same diameter as the casing. When drilling, the bottom section casing is first set down, and blocks of stone are backfilled in the casing until it is placed in place. The casing is then backfilled with the clay dug out from the hole. After the backfilling is completed, the casing is taken out, and then a 7.5-meter-long casing is set down by vibration using a puller to solve the above problem. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides an auxiliary tool for setting a long casing, which solves the above problems.

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: an auxiliary tool is provided under a long casing, including a square head driver, a casing is fixedly provided at the bottom of the square head driver, a bottom casing is provided at the bottom of the casing, a male joint is fixedly installed at the top of the bottom casing, a cutting tooth is fixedly installed at the bottom of the bottom casing, a male joint is fixedly installed at the top of the casing, and a female joint is fixedly installed at the bottom of the casing.

[0008] Preferably, the male connector at the top of the sleeve is fixedly mounted on the bottom of the square head driver via a pin.

[0009] Preferably, the male joint at the top of the bottom sleeve is fixedly installed inside the female joint at the bottom of the sleeve through a pin.

[0010] Preferably, a limiting groove is provided on the inner side of the female connector, a limiting block is fixedly installed on the outer side of the male connector, and the limiting block is inserted into the corresponding limiting groove.

[0011] Preferably, the outer diameter of the sleeve is 1600 mm, the wall thickness of the sleeve is 25 mm, the height of the sleeve is 2000 mm, the outer diameter of the bottom sleeve is 1600 mm, the wall thickness of the bottom sleeve is 25 mm, and the height of the bottom sleeve is 4000 mm.

[0012] Preferably, the outer diameter of the male connector is 1500 mm, and the outer diameter of the female connector is 1600 mm.

[0013] Beneficial Effects

[0014] The utility model provides an auxiliary tool for installing a long casing. Compared with the prior art, it has the following advantages:

[0015] Beneficial effects:

[0016] The long casing is equipped with auxiliary tools. When the casing is installed through the large diameter casing, the disturbance of the long casing to the surrounding strata and graded crushed stone and cement slurry layers is reduced, which is conducive to the horizontal bearing capacity of the pile foundation; it effectively solves the difficulty of installing the long casing and improves the efficiency of installing the long casing. At the same time, it also greatly avoids the phenomenon of hole collapse, slurry leakage and buried drill, improves construction efficiency, ensures construction safety and reduces construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the implementation scheme of the utility model or the technical scheme in the prior art, the drawings required for use in the implementation scheme or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation schemes of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is a three-dimensional diagram of the external structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the connection between the square head driver and the sleeve of the utility model;

[0020] Figure 3 It is a schematic diagram of the bottom casing structure of the utility model;

[0021] Figure 4 It is a schematic diagram of the casing structure of the utility model.

[0022] In the figure: 1, square head driver; 2, sleeve; 3, bottom sleeve; 4, pick; 5, male connector; 6, female connector; 7, limit block; 8, limit groove. DETAILED DESCRIPTION

[0023] It should be noted that in the description of the embodiments of the present application, the terms "front, rear", "left, right", "up, down", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application. The terms "install", "connect", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0024] The present application is further described in detail below through drawings and examples.

[0025] Reference Figures 1 to 4 The embodiment of the present application provides an auxiliary tool for long casing, including a square head driver 1, a casing 2 is fixedly arranged at the bottom of the square head driver 1, a casing shoe 3 is arranged at the bottom of the casing 2, a male joint 5 is fixedly installed at the top of the casing shoe 3, a pick 4 is fixedly installed at the bottom of the casing shoe 3, a male joint 5 is fixedly installed at the top of the casing 2, and a female joint 6 is fixedly installed at the bottom of the casing 2. The male joint 5 at the top of the casing 2 is fixedly installed at the bottom of the square head driver 1 through a pin shaft. The male joint 5 at the top of the casing shoe 3 is fixedly installed inside the female joint 6 at the bottom of the casing 2 through a pin shaft.

[0026] The inner side of the female connector 6 is provided with a limit groove 8, and the outer side of the male connector 5 is fixedly provided with a limit block 7, which is inserted into the corresponding limit groove 8. The outer diameter of the sleeve 2 is 1600mm, the wall thickness of the sleeve 2 is 25mm, the height of the sleeve 2 is 2000mm, the outer diameter of the bottom sleeve 3 is 1600mm, the wall thickness of the bottom sleeve 3 is 25mm, and the height of the bottom sleeve 3 is 4000mm. The outer diameter of the male connector 5 is 1500mm, and the outer diameter of the female connector 6 is 1600mm.

[0027] In this embodiment, the square head driver 1 is composed of an upper drill rod and a lower driver. The drill rod is connected to the rotary drilling rig. The driver is a convenient casing driving device connected to the square head of the drill rod, and is used to transmit the torque and pressure of the rotary drilling rig to the casing 2 to achieve the sinking, pulling and rotation of the casing 2. The advantage of the driver is that the equipment structure is simple and the procurement cost is low. It does not require additional hydraulic stations or other large equipment to assist in construction, which can effectively improve construction efficiency and reduce construction costs.

[0028] Working principle:

[0029] The first step is to connect the driver and connect the driver to the drill pipe.

[0030] The second step is to place the bottom sleeve 3, put the bottom sleeve 3 in the hole position, connect the square head driver 1 with the bottom sleeve 3, and screw the square head driver 1 and the bottom sleeve 3 to the corresponding position through four pins to connect;

[0031] The third step is to lower the first section of casing. Due to the poor density of the surface soil and the small side resistance, the first section of casing is relatively easy to lower until the top of the casing is 40 to 60 cm above the ground surface.

[0032] Step 4: Lower the second section of casing: Repeat step 2; adjust the drilling rig to align the two sections of casing and connect the second section of casing (if the downward resistance of the casing is large, the power head can be reversed to carry out drilling. If it still cannot drill, the drill bit can be used to fish out the rocks in the casing and use the method of lowering the casing while drilling, but the depth of the drill bit shall not exceed the bottom of the casing.);

[0033] The fifth step is to backfill the casing with silty clay and then pull out the casing (the clay backfill must be dense to prevent the clay in the hole from sinking and rocks from falling off after the casing is pulled out, causing the hole to collapse). Use a plate inserter to lower the casing into place.

[0034] Casing construction precautions:

[0035] Verticality: During the casing installation process, the verticality of the casing should be checked from time to time. You can use a bubble level ruler close to the casing for testing, or you can use a plumb bob hanging from a rope as a reference for testing (monitoring from two vertical directions).

[0036] The casings are precisely matched, and every two sections of casing are connected by bolts. When the casing is reused, each part of the casing should be flushed in time after the casing is taken out to remove the remaining dirt. Especially the joints (including thread rings, cone rings, bolts), the thread rings and bolts should be cleaned with an iron brush. When installing the bolts, the alignment bolt installation method is adopted. First install the two bolts facing each other, then rotate 90 degrees, and then install the two bolts facing each other, and install them in alignment in sequence.

[0037] During casing construction, it is prohibited to use hard objects to knock or hit the casing to prevent deformation of the casing.

[0038] During casing construction, ensure the verticality of the casing to avoid collision between the drill bit and the casing.

[0039] After field tests, the large-diameter casing designed this time reduced the disturbance of the surrounding strata and graded gravel and cement slurry layers caused by the long casing during the installation of the casing, which was conducive to the exertion of the horizontal bearing capacity of the pile foundation; it effectively solved the problem of the difficulty of installing the long casing and improved the efficiency of the installation of the long casing. At the same time, it also greatly avoided the phenomenon of hole collapse, slurry leakage and buried drill, improved construction efficiency, ensured construction safety, and reduced construction costs.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An auxiliary tool for a long casing, comprising a square head driver (1), characterized in that: A sleeve (2) is fixedly arranged at the bottom of the square head driver (1), a bottom sleeve (3) is arranged at the bottom of the sleeve (2), a male joint (5) is fixedly installed at the top of the bottom sleeve (3), a pick (4) is fixedly installed at the bottom of the bottom sleeve (3), a male joint (5) is fixedly installed at the top of the sleeve (2), and a female joint (6) is fixedly installed at the bottom of the sleeve (2).

2. The auxiliary tool for long casing according to claim 1 is characterized in that: The male connector (5) at the top of the sleeve (2) is fixedly mounted on the bottom of the square head driver (1) via a pin shaft.

3. The auxiliary tool for long casing according to claim 1 is characterized in that: The male connector (5) at the top of the bottom sleeve (3) is fixedly mounted inside the female connector (6) at the bottom of the sleeve (2) via a pin.

4. The auxiliary tool for long casing according to claim 1 is characterized in that: A limiting groove (8) is provided on the inner side of the female connector (6), a limiting block (7) is fixedly installed on the outer side of the male connector (5), and the limiting block (7) is inserted into the corresponding limiting groove (8).

5. The auxiliary tool for installing a long casing according to claim 1 is characterized in that: The outer diameter of the sleeve (2) is 1600 mm, the wall thickness of the sleeve (2) is 25 mm, the height of the sleeve (2) is 2000 mm, the outer diameter of the bottom sleeve (3) is 1600 mm, the wall thickness of the bottom sleeve (3) is 25 mm, and the height of the bottom sleeve (3) is 4000 mm.

6. The auxiliary tool for installing a long casing according to claim 1, characterized in that: The outer diameter of the male connector (5) is 1500 mm, and the outer diameter of the female connector (6) is 1600 mm.

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