JP2005002610A - Method for driving steel pipe pile, and screw type steel pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To create a safe, low-cost and easy-to-construct steel pipe pile by integrating a preceding steel pipe and a following steel pipe together as the steel pipe pile with a prescribed length by a screw joint through the use of a steel pipe as a steel material to be used along with construction work in place of an inhibiting pile with heavy weight and low strength. <P>SOLUTION: The steel pipes 13 and 13a are integrated together in a full-rotation-type all casing device 9 by an accompanying crane 12 via a screw; inner excavation and earth removal are performed by means of the accompanying crane 12 via an excavating grab 17; and an anti-rotation pin 20a prevents excessive rotation and corotation. Embedment is efficiently performed with sufficient strength and light weight, and the steel pipe pile is driven in an extremely efficient manner with good working efficiency, safety and low costs. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The disclosed technology uses steel pipes with excellent lightness and strength as steel materials used for deterrent piles, foundation piles, etc., and vehicle traffic and construction on general national roads etc. that are routed when they are brought to the site. The design length is divided into multiple parts such as lower piles and middle piles in order to meet the requirements for portability difficulties caused by restrictions on the sky when built at times, depending on the site It belongs to the field of technology that can be divided into predetermined lengths.
[0002]
[Prior art]
Conventionally, in a civil engineering work, when a steel pipe used in a buried type is divided into a plurality of parts and requires mutual joining, a welded structure of a welded joint is often used.
[0003]
However, the welder for the joint takes a lot of time, and the quality of the welder is easily affected by weather conditions such as temperature, humidity, and air volume.
[0004]
Therefore, in recent years, threaded joints have been devised for joining thick steel pipes used for deterring piles, etc., for example, threaded steel pipes and techniques described in the following publications have been devised and put into practical use. Yes.
[0005]
[Patent Document 1]
JP-A-9-95940 [Patent Document 2]
JP-A-10-273914 [Patent Document 3]
JP 11-310921 A [Patent Document 4]
Japanese Patent Laid-Open No. 11-310922
[Problems to be solved by the invention]
However, if the space above the bridge under the road bridge in urban areas is extremely limited, the length that can be built at one time is significantly limited. As a result, the pile length is shortened, resulting in an extremely increased number of joints. Time increases proportionally, and not only costs increase, but there are many inherent disadvantages such as structural defects that increase the possibility of quality deterioration of the weld due to uncertain factors such as weather. It was happening.
[0007]
Also, when placing steel pipe piles on hard ground, it is often difficult to perform direct press-fitting or direct driving work, in which case construction to secure excavation holes such as all-casing construction for hard ground is to be built. In this case, two processes, such as excavation and erection, have emerged. In addition, the casing used for excavation and the above steel pipe are similarly shortened, and the welded joints are Due to the increase, the construction has been prolonged for a long time, but tends to increase in cost.
[0008]
In addition, when there are no restrictions on the sky, construction in urban areas is complicated in an overcrowded state, and there is a general public living space, station, office district, etc. next to the construction site. In many cases, it is unavoidable that the sparks generated during welding enter the sight of a passerby passing through the vicinity, and the improvement has been desired from the viewpoint of protecting the living environment.
[0009]
On the other hand, in recent years, with the lessons learned from the Great Hanshin-Awaji Earthquake, it has become necessary to strengthen the seismic design of urban underground structures. There is an increasing demand for adoption as a foundation structure.
[0010]
Therefore, in urban construction, considerations for restrictions on existing structures and the densely populated living environment, such as those described above, differ from construction of deterred piles that are carried out in areas where the population density in mountainous landslide areas is extremely low. Against the backdrop of special conditions arising from this, it was necessary to further shorten the time required for foundation construction using steel pipes.
[0011]
In order to cope with this, the techniques described in the above-mentioned patent documents 3 and 4 have been improved and developed. However, all of these techniques are not sufficient to satisfy the above-described conditions.
[0012]
OBJECT OF THE INVENTION
The purpose of the invention of this application is to eliminate the unsatisfactory point of the above-mentioned publication invention at high speed, low cost, and construction of the foundation structure using steel pipes in construction sites requiring urgent construction such as urban construction. New excellent threaded steel pipes that will benefit the field of civil engineering technology use in the construction industry by giving sufficient consideration to the living environment for quality construction and enabling safe construction that does not depend on the site environment, which is a constraint condition with existing technology. And a method for placing steel pipe piles.
[0013]
Means to be Solved by the Invention
In order to solve the above-mentioned problems, the configuration of the invention of the present application, which is summarized in the scope of the above-mentioned claims in line with the above-mentioned purpose, is the next time to the steel pipe as the lower pile placed last time. In a method in which steel pipes as piles are joined together by screwing and connected continuously as a single steel pipe pile, it is the next In a method in which steel pipes as piles are connected together via screw joints and are continuously placed as a single steel pipe pile, it is possible to rotate and press into the hard ground with a full-rotation all-casing excavator at the tip of the steel pipe. The thickness of the lower end of the steel pipe forming the cutting bit is substantially the same as the width of the cutting bit, and then the inside of the steel pipe is dug through a drilling grab by an associated crane. So that excavation and soil removal, When screwing the pile, the screw joint is sufficiently tightened so that the gap is equal to or smaller than a predetermined gap, and a protective box is attached to the screw joint so that the tightening is finely lowered when the screw is joined. Interposing, and thus fixing the lower end of the upper pile and the upper end of the lower pile by interposing an anti-rotation pin when screwing the steel pipe of the preceding lower pile and the following upper pile. Therefore, at this time, the steel pipe pile is used for continuously placing the steel pipe pile, and the difference in thickness from the thickness of the cutting bit planting portion which is thicker than the thickness of the steel pipe main pipe. A threaded steel pipe having a gradually changing structure, wherein the wall thickness changes substantially along the hypotenuse of a right triangle with the wall thickness difference being the base and the length being 4 to 6 times the wall thickness difference. The second backbone is that the structure is a gradient, and the structure of the joint is steel. When the structure in which the step difference from the thickness of the screw joint portion, which becomes thicker than the thickness of the main pipe, is gradually changed, the difference in thickness is used as the bottom, and the difference in thickness is 1.5 to 2 times the thickness difference. The third basic feature is that the thickness is changed along the hypotenuse of a right triangle whose height is the height, and further, in the press-fitting method for steel pipe piles, It is possible to avoid direct interference with the excavation grab when excavation and excavation work in the steel pipe is performed by the excavation grab between the steel pipe of the upper pile and the screw joint of the steel pipe of the upper pile. In addition, a protective box is provided at the screw joint portion, and in addition, when the protective box is externally mounted on the joint portion, a pin provided for interposing an anti-rotation pin at the screw joint portion Engage with the hole so that the exterior of the protective box can be fixed to the screw joint. The technical measures that have been taken into account.
[0014]
[Action]
Thus, in the above-described configuration, first, a cutting bit is integrally planted at the tip of the preceding steel pipe as the lower pile without performing the excavation work for installing the steel pipe used as a previous work as the steel pipe pile. Even when a rotational force or pressure input, which is a driving force for excavation, is applied to the screw joint joint so that it can function as a drilling casing and high-speed joining can be performed at the steel pipe joint. It is formed in the same way as the thickness of the lower part of the steel pipe and the width of the cutting bit so that there is no deformation or breakage of the cutting bit so that the screw joint is sufficiently tightened and the rotational force And anti-rotation pins with sufficient strength so as to be able to resist the pressure input, so that the excavation can be stably performed, and interference of the hammer grab that enters and exits the steel pipe as needed during excavation press fitting To the impact force In order to protect the threaded joint so as not to be damaged, a protective cap is externally provided and covered on the screw joint, and at that time, in the joint joint, the bottom is the difference in wall thickness, The impact force is reduced by forming a change gradient portion so as to be substantially along the hypotenuse of the right triangle whose height is 2 to 6 times or 1.5 to 2 times. Durability is remarkably improved so that sliding can be done freely by avoiding wear caused by impact force and preventing vibration noise.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the invention of this application will be described as an embodiment of the present invention with reference to the drawings as follows.
[0016]
The construction procedure of the invention of this application will be explained with reference to FIG. 1. First, as shown in FIG. 2, the screw joint surface 19 of the lower pile 13 of the steel pipe is protected with a protector, as shown in FIG. While protecting the screw joint surface 19 of the screw joint portion with a rubber sheet or the like as shown in FIG. 1, next, as shown in Step 2 of FIG. Then, it is completely removed, and then applied to the threaded portion using a lubricant such as grease to prevent seizure of the screw joint surface 19 as in step 3.
[0017]
Next, as shown in step 4, axial alignment is performed to align the centers of the steel pipes of the lower pile 13 and the upper pile 13a. Then, as shown in step 5, as shown in FIG. 3, the upper pile 13 a is rotated by the full-rotation type all-casing device 9 by manually screwing with an appropriate tightening jig using a band, an arm, or the like. To reduce the impact on the steel pipe.
[0018]
Then, as shown in Step 6, when the connection is completed by joining the screw joint surface 19 of the steel pipe, a predetermined number of rotation preventions are provided to the protective box 20 shown in FIG. As shown in Step 7 by inserting the pin 20b, the rotation prevention pin 20b is attached, and the upper end of the lower pile 13 and the lower end of the upper pile 13a are connected.
[0019]
The above-described procedure will be described in more detail. First, as shown in FIG. 3, a full-rotation type all-casing device 9 is carried in and set on a predetermined ground 8 by a crawler crane or the like, and a counterweight 10 or spike 11 is used. Set in a stable state.
[0020]
And as shown in FIG. 4, the lower pile 13 as a preceding steel pipe is built in the chucking part which is not illustrated in the said all rotation type | mold all casing apparatus 9 with the accompanying crane 12. As shown in FIG.
[0021]
And when inserting into the chucking part of the all-rotation type all casing device 9 of the lower pile 13, as shown in FIG.
[0022]
Next, as shown in FIG. 5, a cutting bit 15 such as a bit is attached to the tip portion 14 of the lower pile 13 so that excavation is possible in a factory in advance.
[0023]
As shown in FIG. 11, the screw joint portion 19 has a thickness difference on the base c, a height h on the base c, and an inclined side e of a right triangle having a gradient change substantially along the hypotenuse e. In this case, when the height h is 4 to 6 times the base c, when the interference between the shell tip of the grab 17 and the thickness change portion of the screw joint surface 19 occurs during the digging operation. Downhill is free and has the effect of reducing the impact on the steel pipe. Also, in the aspect where the height h is 1.5 to 2 times c, it occurs when the excavation grab 17 is operated. It has been experimentally found that there is an effect of reducing the generation of interference sound at each part and performing low vibration and low noise in urban areas.
[0024]
Then, as shown in FIG. 6, when the lower pile 13 as the preceding steel pipe is driven at a predetermined depth, the excavation grab 17 is suspended by the companion crane 12 and brought into the lower pile 13 as shown in FIG. 7. As is well known, predetermined digging and earth removal are performed.
[0025]
Then, as shown in FIG. 8, after confirming that the lower pile 13 has been placed in advance, excavated and excavated at a predetermined depth, the succeeding upper pile steel pipe is connected via the companion crane 12. 13a is suspended from the all casing device 9, and the screw joint surface 19 of the lower pile 13 is face-aligned and centered by a band or a chain tongue (not shown), and rust and sand are removed from the screw joint portion 19 to obtain grease, etc. As shown in FIG. 10, a predetermined number of anti-rotation pins 20b are inserted through pin holes 20a provided around the protective box 20 with the protective box 20 interposed therebetween. Thus, mutual rotation prevention between the upper end portion of the lower pile 13 and the lower end portion of the upper pile 13a is achieved to prevent co-rotation associated with the rotation of the all-rotation type all casing device 9 with respect to the upper pile 13a, thereby preventing excessive co-tightening.
[0026]
After the integral connection of the upper and lower steel pipes 13 and 13a by the screw joints 19 is completed, the steel pipes 13 and 13a are separated from the steel pipes 13 and 13a by the companion crane 12 and the all casing device 9 to prepare for the next re-placement.
[0027]
In the meantime, for all the steel pipes 13 and 13a joined and integrated, the entire casing device 9 performs rotational press-fitting to a predetermined depth with respect to the entire length. The excavation grab 17 performs excavation and earth removal as is well known.
[0028]
Then, in the rotational press-fitting construction, the rotation is, for example, a clockwise rotation in the same manner as in the direction of forming the rotation prevention pin 20b.
[0029]
Of course, the embodiment of the invention of this application is not limited to the embodiment described above. For example, in the middle of excavation and earth removal, the steel pipes 13 and 13a for the pre-construction and post-construction can be used. For example, rotational press-fitting can be performed.
[0030]
【The invention's effect】
As described above, according to the invention of this application, the steel pipe pile is basically made of a steel material such as a steel pipe used for a construction work, so that the strength is sufficient, and the steel pipe is light and easy to handle. The construction efficiency of piles is improved, the construction period is short, the safety is high and the cost is low, and the screw tightening to the screw joint surface is joined with a fine motion effect. Thus, when interference occurs between the wall thickness changing portion and the end of the excavation grab, it is possible to slide down and climb up, and there is an advantage of reducing the impact on the steel pipe.
[0031]
Moreover, there is also an advantage that the construction is extremely easy by using a steel pipe for excavation and earth removal.
[0032]
And since the preceding lower pile 13 and the succeeding upper pile 13a of the steel pipe of the upper and lower piles 13 can be connected and integrated in a tightening manner via the anti-rotation pin 20b with respect to both screw joint portions 19, only rust or sand Since it is only necessary to add maintenance work such as removal of grease and application of grease, the construction efficiency is good, and an excellent effect that safe construction management can be performed is achieved.
[0033]
In this process, as shown in FIG. 10, when the upper end of the lower pile 13 and the lower end of the upper pile 13a are joined by screw connection, a protective box 20 for preventing rotation is put on the joint portion of both. Then, by connecting to the screw hole 20a via the rotation prevention pin 20b, both rotations are prevented.
[0034]
And, when the steel pipe is placed, the tightening is slightly moved down so that the screw joint is not damaged even when driving force, rotational force, and pressure input are applied during excavation. There is an effect that can be done.
[0035]
Moreover, the impact force with respect to a drill bit can be reduced by making it not thicker than the thickness of the lower end of a steel pipe with the same thickness as the drill bit.
[Brief description of the drawings]
The drawings represent embodiments of the invention of this application.
FIG. 1 is a flowchart of a construction procedure.
FIG. 2 is a flowchart of the work.
FIG. 3 is a set posture side view of the all-rotation type all-casing device installed at a predetermined portion of the ground.
FIG. 4 is a side view of a set-up attitude of a steel pipe as a lower pile to the all-rotation type all-casing apparatus using an accompanying crane.
FIG. 5 is an explanatory view of the cutting blades at the tip of the steel pipe of the preceding lower pile.
FIG. 6 is a side view showing a mode of rotary press-fitting of a preceding steel pipe of a lower pile with respect to the ground by an all-rotation type all casing device.
FIG. 7 is a side view showing an aspect of excavation and excavation of the steel pipe of the preceding lower pile.
FIG. 8 is a side view of an addition mode of a leading lower pile steel pipe and a trailing upper pile steel pipe for a full-rotation type all casing device.
FIG. 9 is a side view of medium excavation by excavation grab for steel pipe piles that are integrally joined and connected.
FIG. 10 is a side view of a connection between a rotation prevention pin, a protective box and a pin hole for a screw joint portion of a steel pipe.
FIG. 11 is a schematic view of a structural aspect of a right triangle having a bottom side, a height, and a hypotenuse at a screw joint portion of a steel pipe.
[Explanation of symbols]
9 Full-rotation type all-casing device 12 Companion crane 13 Leading lower pile steel pipe 13a Trailing upper pile steel pipe 15 Cutting bit 10 Counterweight 11 Spike 17 Drilling grab 19 Screw joint (screw joint surface)
c Bottom (thickness difference)
h Height e hypotenuse (change slope)
20b Anti-rotation pin 20 Protective box 20a Screw hole

Claims (5)

In the method of connecting the steel pipe as the next upper pile to the steel pipe of the lower pile that has been previously placed through threaded joining and continuously placing it as a single steel pipe pile, A cutting bit is formed at the tip of the steel pipe so that it can be press-fitted into the hard ground by a full-rotation all-casing excavator, and the thickness of the steel pipe forming the cutting bit is substantially the same as the width of the cutting bit. Next, the inside of the steel pipe is excavated and discharged through an excavation grab by a companion crane, and the screw portion is set to a gap that is not larger than a predetermined gap when the screw is joined. The screw joint is provided with a protective box so that the tightening is finely lowered and joined at the time of the screw joining, and thus the anti-rotation pin is interposed at the screw joining of the steel pipe of the preceding lower pile. Pile top and top pile Striking 設方 method of the steel pipe pile, characterized in that to fix the lower end portion to each other. It is a steel pipe used for continuously placing steel pipe piles, and has a structure that gradually changes the step difference from the thickness of the cutting bit planting portion where the thickness is thicker than the thickness of the steel pipe main pipe. In a threaded steel pipe, it is structured to have a thickness change gradient substantially along the hypotenuse of a right triangle with the thickness step as the base and the length 4 to 6 times the thickness difference as the height. Threaded steel pipe characterized by In the structure of the joint portion, when the structure is such that the step difference from the thickness of the screw joint portion, which becomes thicker than the thickness of the steel pipe main pipe, is gradually changed, 3. The threaded steel pipe according to claim 2, wherein the threaded steel pipe has a thickness change gradient substantially along a hypotenuse of a right triangle having a length of 1.5 to 2 times. In the press-fitting of the steel pipe pile, when excavation and excavation work is performed in the steel pipe by the excavation grab between the preceding steel pipe of the lower pile and the screw joint of the steel pipe of the upper pile, the excavation is performed. 4. The screw-type steel pipe according to claim 2, wherein a screw protection box is externally provided at the screw joint so as to avoid direct interference with the grab. When the protective box is externally mounted on the screw part, the external state of the protective box can be fixed to the screw part by engaging the anti-rotation pin with a pin hole that interposes the anti-rotation pin of the screw joint part. The threaded steel pipe according to claim 4, wherein the threaded steel pipe is configured as described above.

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