JPH01187225A - Centering base frame and casing or steel tubular pile penetrating work therewith - Google Patents

Abstract

PURPOSE:To simplify structure of a centering base frame, easily and cheaply product it, and exactly form a pile by forming a centering device consisting of a centering base frame of a specific form which is combined with a centering guide as needed. CONSTITUTION:A through hole 3 of a slightly larger diameter than the outside diameter of a casing is formed in the center of a flat plate 2, and a short cylinder 4 of an inside diameter equal to the diameter of the hole 3 is integrated with the back side of the hole 3 in such a way as to make the center axle vertical to the plate 2. Vertical blade pieces 5 are integrated with the outside of the cylinder 4 to form a centering base frame 1. The centering device consisting of the frame 1 is matched with the center axle of a pile formed of the cylinder 4 and the blades 5, and the plate 2 is fixed horizontally and penetrated into the ground. The positioning operation can be simplified and performed exactly by combining with a centering guider 6.

Description

[Detailed Description of the Invention] [Object of the Invention] A cast-in-place pile construction method that is adopted as one of the reinforcing methods in order to ensure that the ground safely supports modern buildings and structures that are becoming increasingly large. In other words, in construction methods in which a vertical hole of a predetermined diameter is excavated at the site, and concrete is poured into the hole or prefabricated piles are inserted to create piles, the vertical hole is usually The casing or steel pipe for the steel pipe pile will be buried in parallel to the excavation. The present invention provides a novel centering device and a new centering device for ensuring that the direction of excavation of a vertical hole in the cast-in-place method and the press-in position of a casing or steel pipe pile (hereinafter simply referred to as casing, etc.) are correctly realized without deviation. The aim is to develop and complete a press-in construction method for casings, etc. using the same, and to provide it.

[Prior Art] The construction of piles has become one of the most effective and common methods for strengthening the ground that supports buildings, civil engineering works, and the like. However, as the structures and civil engineering works that must be supported have become larger in recent years, the piles used have become extremely long due to their strength.
It has become impossible to drive with a hammer as before, and even if piles that can be driven with a temporary hammer are used, noise pollution is a social problem in urban areas, so the use of the hammer itself is restricted. I'm in a situation where I feel like I'm being abused.

Therefore, although there is a water jet method that does not cause IIH pollution as an alternative to the hammering method, it is not necessarily common, and in recent years, a vertical hole of about 1 m in diameter is pre-drilled and formed in a predetermined location. In order to prevent the wall from collapsing, casing or bentonite liquid is inserted or injected, and reinforcement is placed inside and concrete is poured to form piles (usually called the cast-in-place pile method), or pre-cast concrete piles are inserted. Then, concrete milk is injected into the surrounding area to form a pile that is integrated with the ground (usually called the prefabricated pile installation method), or a steel pipe that is itself part of the pile instead of a casing is used. The construction of piles by the so-called cast-in-place method, such as embedding steel pipe piles and forming steel pipe piles (usually called the steel pipe pile method), is increasingly being adopted.

However, in this cast-in-place method, it is quite difficult to correctly form the pile hole and the press-fit position of the casing, etc., and each time the site staff has to use their intuition and take time to carry out the process. The reality is that
When the pile driving is completed and the bed is excavated, if it is found that the pile core is misaligned beyond the allowable range, the misaligned pile may be driven again because the designed bearing capacity cannot be obtained. This means that the existing pile driving process, which is time consuming, will have to be repaired, and the pile driving process, which was already time consuming, will have to be made even more time consuming and labor intensive.

Such blunders can seriously disrupt the schedule at the construction site and have a significant impact on construction costs, so construction companies must never forgive them. Despite attempts to take time for construction, in reality, the reality has been that several substandard piles have been constructed at a single site.

This invention was developed in light of these circumstances, and as a result of continuous research and development as someone who has been working in the field for many years, we have finally realized an extremely novel solution as detailed below. be.

[Configuration of the Invention First, the centering device of the present invention has the following configuration.

That is, as shown in the perspective view of the body in Figure 1 and the central vertical sectional view in Figure 2, a hollow hole 3 having a diameter slightly larger than the outer diameter of the casing etc. A short cylindrical body 4 having an inner diameter approximately equal to the diameter of the separated hole 3 is integrated on the back side of the flat plate 2 with its central axis perpendicular to the flat plate 2. A plurality of vertical vanes 5, 5... are located outside the short cylindrical body 4.
This is a centering device in which a centering frame 1 is formed by integrally fixing ....

The flat plate 2, the short cylindrical body 4, and the wing plate 5 are each made of a thick steel plate having sufficient strength, and are firmly integrated with each other by explosive bonding or other means, and are pressed against the rock surface. It is also made to be strong enough to not easily deform.

Furthermore, it is extremely convenient for the short cylindrical body 4 and the blade plate 5 to have their lower edges and outer edges formed into blade shapes 41 or 51 so that they can easily dig into the ground.

The vane plate 5 has an anchor function to prevent the fixing position from easily shifting due to external force when this device is press-fitted and fixed into the ground and tries to exert the function of regulating the insertion direction of the casing C etc. At the same time, it also fulfills the reinforcing function of the short cylindrical body 4, and as shown in the drawing,
It is desirable that they be arranged in a radial arrangement toward the central axis of the short cylindrical body 4.

In the figure, 21, 21, . . . indicate hanging pieces for hooking wires W etc. when lifting the centering frame 1. .

The centering device consisting of the centering frame 1 can be further assembled with a centering guide tool 6, as shown in the partially omitted plan view of FIG.
The following improved centering device can be realized.

That is, a cut-out hole 3 having a diameter slightly larger than the outer diameter of the casing etc. C is formed in the center of the flat plate 2, and a short cylindrical body having an inner diameter approximately equal to the diameter of the cut-out hole 3 is formed on the back side of the cut-out hole 3. 4
are integrated so that their central axes are perpendicular to the flat plate 2, while a plurality of vertical blade plates 5 are placed on the back surface of the flat plate 2 at a location outside the short cylindrical body 4. ,5...
A centering base frame 1 is formed by integrally fixing the centering base frame 1, and a centering guide tool 6 having a guide rod 7 at the center is attached to the centering base frame 1 so that the tip of the guide rod 7 is connected to the centering base. Frame 1
This is a centering device in which a centering guide tool 6 is combined with a centering frame 1 which is fitted so as to be positioned at the central axis position of a short cylindrical body 4.

It is preferable that the centering device formed by combining the centering frame 1 with the centering guide tool 6 has the following configuration.

(Example 1) That is, the centering guide tool 6 was integrated with a centering guide rod 61 having a tip guide needle 62 that is vertically movable so as to be orthogonal to the guide rod 61. Horizontal rod 63.63
. . . and inner diameter adjustment pieces 64 and 64 that can be temporarily attached to the horizontal rod 63, and by adjusting the inner diameter adjustment piece 64, the temporary attachment position of the inner diameter adjustment piece 64 can be adjusted to the centering position. It is approximately aligned with the diameter of the hollow hole 3 of the underframe 1,
Center this centering guide tool 6 to t of the centering frame 1! 1 punch hole 3
It is formed in such a way that it fits from above,
This is a centering device combined with a centering frame 1.

In the illustrated embodiment, three horizontal rods 63 are formed radially with respect to the guide rod 61, but the number is not particularly limited. The number of guides 861 may be any number that is convenient for positioning the guide 861 in the center position of 3.
The horizontal rod 63 may be replaced by a flat plate, a ring, or the like, as long as it has a convenient configuration for positioning the horizontal rod 63 in the center of the hollow hole 3.

The tip guide needle 62 is loosely fitted into the hollow portion of the guide rod 61 from above, and its removal is restricted by a cap 65 in which a lifting hole 66 is formed.

In the figure, 67 is a connecting rod that connects the tips of the horizontal rods 63, 63..., and the reinforcing diagonal rods 68, 68...
... is connected to the upper end of the guide rod 61.

Next, a construction method using the centering device having the structure as described above will be described, and it will consist of the following steps.

``First step'' As shown in FIG. 7, the centering device is operated so that the center axis position of the short cylindrical body 4 in the centering device matches the center axis position of the pile to be formed. The cylindrical body 4 and the vane plate 5 are forcibly pressed into the ground foundation, and the centering device is fixed in a predetermined position by making the flat plate 2 of the device horizontal.

``Second Step'' The casing etc. C containing the auger 0 is inserted from above into the short cylindrical body 4 of the centering device fixed in a predetermined position as shown in FIG. 0 is activated to start drilling, and in the process of gradually press-fitting the casing etc. C along the vertical hole being excavated, the casing etc. C is restricted by the inner wall of the short cylindrical body 4 of the centering device. By doing so, the excavation direction of the auger 0 and the central axis position of the casing etc. C are approximately aligned with the central axis of the pile to be naturally formed, and the excavation and gauging etc. to complete the press-fit.

Step 31: In a state where the casing etc. C is press-fitted almost accurately, concrete is poured into the vertical hole V which is excavated and formed by appropriate means, for example, after reinforcement is placed, or by pouring concrete into the vertical hole V which has been excavated with the casing etc. C pressed in almost accurately. A pile P is formed by inserting a ready-made concrete pile and filling the surrounding area with concrete-1-milk.

"Fourth Step" After forming the pile P, as shown in FIG. 12, the centering device is removed.

Although it is not necessary in the case of f14IT-anti-C, in the case of the casing C, the process of pulling it out from the vertical hole V is not particularly regulated by the present invention, and depends on the method of forming the pile P! For example, if a pre-cast concrete pile is used as in the illustrated embodiment, the top of the pre-cast concrete pile may be held down after filling with concrete milk to prevent it from rising. It is desirable to pull out the casing C and make it as shown in Fig. 11 while pouring the concrete. Alternatively, bentonite solution may be injected to prevent the wall soil of the vertical hole (3) from collapsing before the casing C is pulled out.

The casing or steel pipe pile press-fitting method using the centering device of the present invention, which is carried out in this way, is further carried out by the following specific method.

(Example 2) That is, in the first step, as shown in FIG. After carefully positioning the centering frame 1 on the ground as shown in Fig. 6, while making sure that it is in the center position, the short cylindrical body 4 and wing plate 5 of the centering device are forcibly placed on the ground. At the same time, as shown in FIG.
This is a casing press-fitting method that involves four steps.

(Example 3) Next, after carrying out the first process as described above, the second process was carried out as shown in FIG. As if there were
The auger head portion 01 is replaced with a residual soil processing hopper H formed with an excavation head H1, and the residual soil in the vertical hole V is treated, and thereafter, the residual soil is treated while continuing excavation until a predetermined depth is reached. Accordingly, the excavation of a vertical hole V of a predetermined depth and the press-fitting of a casing etc. C are completed, and the casing etc. press-fitting method is performed by carrying out the third step and the fourth step.

The residual soil processing hopper H used in this process is a vertically long drum-shaped one with a diameter smaller than the inner diameter of the casing etc. , an excavation head H1 is installed obliquely along the cut, which is capable of scooping up the remaining soil from the cut, and scraping away at least some of the rock after the processing of the remaining soil is completed;
It has a structure in which an air pipe for transporting earth and sand is installed from the inside to the ground level.

(Example 4) In the following example, after carrying out the first and second steps as described above, the pile P formed in the third step is a pile formed by the prefabricated pile construction method. In the pile forming process,
After pulling out the casing C, the pile fixing casing F is fitted onto the head of the pre-formed concrete pile using the cut-out hole 3 of the centering device, and the pre-formed concrete pile is stabilized until it is fixed. Hereinafter, the fourth step will be carried out to form a casing press-fitting method.

The pile fixing casing F is a hollow drum-shaped piece having an appropriate weight, and has a structure in which needles can be loaded as appropriate, and can prevent the existing concrete pile from lifting up, and the bottom shape is fixed. It is formed so that it can fit into the head of the pile to be piled. In addition, the 12th
In the figure, Fl indicates a matching part.

[Operation and Effect] The centering device of the present invention having the structure as described above has an extremely clean structure, is easy to manufacture and handle, can be used repeatedly, and is relatively inexpensive. Not only is it possible to provide this equipment, but above all, by adopting this equipment, it is possible to create piles P accurately according to the standards, so the results of construction of cast-in-place piles that are formed in the conventional manner are There is no need to worry about having to take great care and time to prevent variations due to mid-stage construction accuracy, and this alone is extremely economical and efficient.
Adopting the equipment itself can be completed with an investment that is almost negligible in terms of the overall construction cost, and overall it can generate immeasurable economic benefits and create a sense of trust as a contractor. .

In particular, when the centering guide tool 6 is combined, the installation of this device on the pile core to be formed becomes very easy and accurate, and it goes without saying that the device can be installed accurately. Since the pile P formed using the centering wheel as a guide becomes more accurate, the effect brought about by the centering device of the present invention becomes even more remarkable.

In addition, the construction method carried out using this device is simply a forcible press-in to the ground or removal. It is only necessary to simplify "C", and the other processes can be carried out in the same way as the on-site pile formation process that employs the conventional casing cap C. Although the number of steps does not increase significantly compared to the construction method of It could be huge.

In particular, in the construction method that employs this device in combination with the centering guide 6, the positioning work in the first step is always quick and accurate, making it necessary to train skilled workers. This method can be carried out easily and reliably, and in the second step, a residual soil processing hopper H is used to take out the soil at the bottom of the vertical hole V.
No matter how deep the vertical hole V is, it is possible to reliably form the vertical hole V as specified, and furthermore, the third
In cases where the process includes the installation of a pile fixing casing F for fixing the head of the prefabricated concrete pile, the pile P formed using the prefabricated concrete pile is
However, after construction, it can move within the condensation V due to some impact and the effect of accurately installing it in the vertical hole V will be lost. The construction method implemented by employing the device of the invention has even higher practical value.

As mentioned above, this invention improves the construction of cast-in-place foundations in terms of workability, construction accuracy, and economical effects compared to conventional methods. It is expected to be highly evaluated by the many construction companies involved in the construction of piles, which are indispensable as a means of strengthening the ground that supports various buildings that are becoming increasingly large.

[Brief explanation of the drawing]

The drawings are based on representative embodiments of the present invention; FIG. 1 is an overall perspective view showing the device of the present invention, FIG. 2 is a longitudinal cross-sectional view of the same, and FIG. FIG. 4 is a partially omitted plan view showing the apparatus of the present invention by way of example; FIG. 4 is a central vertical cross-sectional view of the same; FIGS. FIG. 3 is a longitudinal cross-sectional view showing the implementation details of typical steps for explanation. ■...Centering frame, 2...The same flat plate, 3...Daily punched holes, 4...The same short cylindrical body, 5...The same wing body, 6...
・Centering guide, C...Casing or steel pipe pile, F
... Pile fixed casing, H... Surplus soil processing hopper, 0... Auger, P... Pile, ■... Vertical hole.・') 1 Figure A 2 Engraving of the drawing Figure 5 (A) (0) Figure 6 (A) (B) (C)
7 Figure 8 Figure 1986 Patent Application No. 069641 Address: 2-1-21 Higashinagaoka, Tendo City, Yamagata Prefecture Name: Kiyoshi Tsuji 4, Agent 7, Contents of the amendment, Figure 1 is , FIG. 2 is an overall perspective view showing the apparatus of the present invention, FIG. 2 is a central vertical cross-sectional view thereof, and FIG. 3 is a diagram showing implementation details in typical steps of the apparatus of the present invention according to another embodiment. FIG. DESCRIPTION OF SYMBOLS 1...Centering underframe, 2...The same flat plate, 3...The daily punch hole, 4...The same short cylindrical body, 5...The same wing body, 6...
・Centering guide, C...Casing or steel pipe pile, F
... Pile fixed casing, H... Surplus soil processing hopper, 0... Auger, P... Pile, ■... Vertical hole. ”
(2) The figure numbers of Figures 5 to 12 of the drawings are corrected as shown in the attached sheet.

Claims (1)

[Scope of Claims] 1. A hollow hole with a diameter slightly larger than the outer diameter of the sink or steel pipe pile is formed in the center of the flat plate, and a short cylindrical body having an inner diameter approximately equal to the diameter of the hollow hole is formed on the back side of the hole. , are integrated so that their central axis is perpendicular to the flat plate, and centering is achieved by integrating multiple vertical vanes on the back side of the flat plate and outside the short cylindrical body. A centering device that forms an underframe. 2. A hollow hole with a diameter slightly larger than the outside diameter of the Keisink or steel pipe pile is formed in the center of the flat plate, and a short cylindrical body having an inner diameter approximately equal to the diameter of the hollow hole is placed on the back side of the flat plate. At the same time, a centering frame is formed by integrating a plurality of vertical vanes on the back side of the flat plate, which is the outside of the short cylindrical body. , a centering base comprising a centering guide having a guide rod at the center fitted to the centering base frame such that the tip of the guide rod is positioned at the center axis of the short cylindrical body of the centering base frame; A centering device that combines a frame with a centering guide. 3. The centering guide includes a centering guide rod having a guide needle at the tip that is movable up and down, a horizontal member integrated so as to be orthogonal to the guide rod, and It consists of an inner diameter adjustment piece that can be temporarily attached, and by adjusting the inner diameter adjustment piece, the temporary attachment position of the inner diameter adjustment piece is made to approximately match the position corresponding to the diameter of the hollowed hole of the centering frame, and this centering A centering device comprising a guide tool combined with a centering frame according to claim 2, wherein the guide tool is fitted into the hollow hole of the centering frame from above. 4. Forcibly press the short cylindrical body and wing plate of the centering device into the ground so that the central axis position of the short cylindrical body in the centering device matches the central axis position of the pile to be formed,
The first step is to fix the centering device in a predetermined position so that the flat plate of the device is horizontal, and the short cylindrical body of the centering device fixed in a predetermined position is attached to a casing or steel pipe pile with an auger inside. The casing or steel pipe pile is inserted into the short cylindrical centering device during the process of gradually press-fitting the casing or steel pipe pile along the vertical hole being drilled. By being regulated by the wall, the auger's excavation direction and the central axis position of the casing or steel pipe pile are approximately aligned with the central axis of the pile to be naturally formed, allowing vertical hole drilling to a predetermined depth and casing. The second step is to complete the press-fitting of the steel pipe pile, and the third step is to form the pile by appropriate means into the vertical hole that has been excavated with the casing or steel pipe pile pressed in almost accurately. Claims 1 to 3 consist of a fourth step of removing the brewing device.
Casing or steel pipe pile press-in construction method using the centering device described in Section 1. 5 In the first step, the centering guide tool 6 is combined with the centering underframe 1, and the centering underframe 1 is positioned on the ground while aligning the tip guide needle 62 with the center position of the hole to be formed. , a process for forcibly press-fitting the short cylindrical body and the lower end portion of the blade of the centering device into the ground, and fixing the centering device in a predetermined position by making the flat plate of the centering device horizontal. The casing or steel pipe pile press-in construction method described in paragraph 4. 6 In the second step, when the auger has not yet completed excavation to a predetermined range, the auger head portion is replaced with a residual soil disposal hopper with an excavation head formed, and the residual soil in the vertical hole is disposed of. The casing according to claim 4, which is a process in which the excavation of a vertical hole to a predetermined depth and the press-fitting of a casing or a steel pipe pile are completed by disposing of the remaining soil while continuing excavation until reaching the depth. Or steel pipe pile press-in method. 7 The pile formed in the third step is a pile formed by the existing pile construction method, and in the pile forming process, the casing is pulled out and then the pile fixing casing is installed using the bored hole of the centering device. The casing or steel pipe pile press-in construction method according to claim 4, which includes a step of stabilizing the existing pile by fitting it into the head of the pile.