JPH0458526B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention mainly relates to a construction method for driving down earth mooring materials such as piles or sheet piles to a predetermined depth in civil engineering and construction work.

[Background Art] In excavation work, step excavation work is sometimes performed in which the depth of excavation varies depending on the location. In such cases, it is necessary to install earth retainers at different excavation depths, and usually, as shown in Figure 1,
A steel pile a is driven from the ground surface, and as the excavation progresses,
Since the upper pile b gets in the way of struts and heavy excavation equipment, it is removed by cutting it, but for example, it is driven by a method called the guide method or the Yatsutoko method, which will be described later, and is driven down to a predetermined depth. Something was being done.

[Problems to be solved by the invention] However, according to the conventional method of cutting the piles, the cut piles cannot be reused after being collected.
This increases the amount of scrap and is extremely uneconomical.
Furthermore, in the guide method, a pile is driven down to the ground surface, and then a guide made of angle material or channel material is attached to the top of the pile to restrain the upper pile. Since the upper pile is inserted into the upper end of the pile and driven to a predetermined depth, it is necessary to interrupt driving and it takes time to install the guide. easy to occur,
The drawback was that the driving accuracy decreased.

On the other hand, the Yatsutoko method is a method that is commonly used when the excavation depth is shallow, about 3 m, and the pile is driven down by covering the head of the pile with a cap called Yatsutoko. Because the circumferential area of the cap is large, it is affected by the soil quality, making it difficult to drive the pile, making it impossible to drive deep piles, and when collecting the cap, it is difficult to collect due to the adhesion of the soil. It was hot.

[Object of the Invention] The present invention aims to solve the problems of the prior art as described above, and it is possible to drive down deep piles easily without cutting the upper pile. The purpose of this project is to propose a downhill construction method that can be recovered quickly, has high driving accuracy, and is easy to install steel sheet piles.

[Means for solving the problems] In order to achieve the above object, the method of the present invention includes:
The piles or sheet piles, etc. that are to be driven down (hereinafter referred to as the "lower side retaining material") and the upper piles or sheet piles, etc. (hereinafter referred to as the "upper side retaining material") that are to be driven from above are the Katsupura Nuts and this. and a steel rod formed with threaded ribs to be screwed together to connect them together, and then drive them into the ground together.After driving, reverse the steel rod and insert it from the lower side earthwork material. The steel rod is pulled out, the same side dowel material is left in the ground, and only the upper side dowel material is pulled out and recovered together with the steel rod.

[Examples] The method of the present invention will be described in more detail below with reference to Examples.

FIG. 2A is a plan view of a steel pile used in carrying out the present invention, and FIG. 2B is a front view showing the connected state of the same pile, and as an example, the flanges 2, 2 of the H pile designated by reference numeral 1 are shown. Fix the cutlet plastic nuts 3 and 3 to the inner surface in advance. At least one coupler nut 3, 3 is fixed to each of the upper and lower ends of the upper H pile 1, and one to the upper end of the lower H pile 1' is fixed by welding. As shown in Fig. 2A, these cut-off nuts are fixed symmetrically on both the left and right sides in pairs, as shown in Figure 2A, and if necessary, they are also attached at a predetermined distance in the middle of the H pile 1 in the length direction. A plurality of coupler nuts 3', 3' may be fixedly spaced apart from each other. It goes without saying that the axes of the coupler nuts 3, 3' attached to the same surface must be aligned in order to fit a steel rod to be described later.

The code 4 is a high-strength steel bar (hereinafter referred to as a PC steel bar), and the above-mentioned Katsupura Nut 3,
It has a threaded rib 5 that can be threadedly engaged with 3'. This PC steel rod 4 is formed to be longer than the length of the H pile 1, and the steel rod 4 is attached to the left and right coupling nuts 3, 3' of the upper pile and the lower pile as shown in Fig. 2B. Screw in each to connect both the upper and lower stakes together.

The thus connected H piles are suspended at the construction site using wires or the like, and then driven using a pile driver according to a conventional method. Unlike conventional methods, the lower and upper piles are driven into the ground continuously without interruption. After driving down the lower pile to a predetermined depth, the PC steel rod 4 is reversed using a jig such as a wrench, and the steel rod is extracted from the lower pile. Next, the lower pile is left as it is in the soil, and only the upper pile is pulled out and recovered together with the steel rod using a winch, vibrating hammer, etc., and the driving operation is completed.

FIGS. 3A and 3B show a state in which coupling nuts 3, 3' are attached to the steel sheet pile 6, and the upper sheet pile and the lower sheet pile are connected by a PC steel rod 4. In this sheet pile, cutlet pull nuts are fixed symmetrically to each part of the flange 7 and section 8, and PC steel rods are screwed into the nuts.
Both the upper and lower sheet piles are connected together and the sections are prevented from shifting.

The procedures for suspending and lowering the connected sheet piles at the construction site and for pulling out and recovering the upper sheet piles after the driving are almost the same as in the case of H piles, so a description thereof will be omitted.

In this specification, only H piles and sheet piles have been described, but the present invention is not limited to these and can also be applied to steel pipe piles and the like.

[Effects of the Invention] As described above, according to the downhill construction method of the present invention, when connecting both the upper and lower earthwork members together, the cutoff plan nut and the steel rod are simply screwed together using a screw mechanism. It is possible to easily and quickly integrate the sections of the upper and lower earthen materials without causing any misalignment. Therefore, when transporting to the site and installing into the auger hole, both the upper and lower shoring materials can be treated as one piece, and when driving, it is possible to drive deeply, and the driving position and angle can be easily corrected. Efficiency is improved and construction accuracy can be increased.

When removing and recovering both the upper and lower hemming materials after the driving is completed, the connected steel rods are reversed and the upper and lower hemming materials are removed immediately without any impact and with low noise. It is possible to untie the two dome materials. Therefore, the steel rod can be removed from the lower dowel, the same side dowel left in the ground, and the upper dowel can be pulled out of the ground along with the steel rod in its almost complete form and recovered. Unlike conventional methods, the connection between the upper and lower shoring members can be easily uncoupled without applying impact loads or causing core run-out. Also,
The upper earthen material does not require cutting and can be recovered in almost complete form, resulting in an excellent effect of improving recovery efficiency and recovery cost.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the pile in step excavation work, Figure 2A is a plan view of the H pile used in the present invention, and Figure 2B
The figure is a front view showing the connected state of the same pile as above, Fig. 3A is a plan view of the steel sheet pile used in the present invention, Fig. 3B is a front view showing the connected state of the same above pile, and Fig. 4 is an explanation of the PC steel bar. It is a diagram. 1...H pile, 2...Flange, 3, 3'...Cut pla nut, 4...PC steel bar, 5...Threaded rib, 6...Steel sheet pile, 7...Flange, 8...Section .

Claims (1)

[Scope of Claims] 1. In a construction method for lowering earth-locking materials to a predetermined depth, a cut-off nut is fixed to each of the upper side earth-stopping material and the lower side earth-locking material before driving, and
A steel rod with threaded ribs formed on both sides is screwed into the cut-off nuts at corresponding positions on the top and bottom to connect the upper and lower shoring materials together, and then these are driven into the ground. The steel rod is pulled out from the lower side dowel by reversing the bar, the same side dowel is left in the ground, and the upper side dowel is pulled out from the ground together with the steel rod and recovered. A construction method for lowering earthen materials. 2. The downhill construction method according to claim 1, wherein the earthen foundation material is a steel pile. 3. The downhill construction method according to claim 1, wherein the earthwork material is a steel sheet pile. 4 Claim 1 in which the steel bar is a high-strength steel bar
The downhill construction method described in section.