JPH02132223A - Method for hammering steel sheet pile into base rock - Google Patents

Abstract

PURPOSE:To make it possible to hammer a steel sheet pile into a rock-bed having large strength by drilling the rock-bed by a dummy sheet pile integrated by a member having the same sectional shape as that of the sheet pile to be hammered or a section suitable therefore and a reinforcing member having a sectional shape symmetrical to the hammer. CONSTITUTION:A dummy sheet pile 2 manufactured integrally or by welding by a member having the same sectional shape as that of a sheet pile 9 to be hammered or a section suitable therefore and a reinforcing member forming a sectional shape nearly symmetrical to the member is hammered in a rock-bed to bore the rock-bed by a vibro hammer or jet water ejection from the top end of the dummy sheet pile 2 and the like. Next, the steel sheet pile 9 is inserted in the bored portion to reinforce the dummy sheet pile 2 so as to easily drill a hard rock. A symmetrical sectional shape is formed at the dummy sheet pile 2 so as to securely hammer well-balanced at the time of hammering by means of the vibro hammer 6. Consequently, the steel sheet pile can be hammered in the hard rock-bed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is directed to driving steel sheet piles into rock using dummy sheet piles, so that steel sheet piles can be driven into relatively hard rock. It is related to the setting method.

(Conventional technology) Conventionally, the method of directly driving steel sheet piles into bedrock is to install a water guide pipe that is movable in the vertical direction relative to the pile body and adjacent to the pile body, and to connect the tip of the pile body to the pile body. Special Publication on a Pile Driving Method for Rock Bed, which is characterized in that the pile is driven into the bedrock by crushing the bedrock by hitting it with a vibrohammer or the like, and then removing the crushed rock with water jetted from a water guide pipe. -13690 invention is generally applied.

In addition, if the bedrock is hard, a steel sheet pile with high-strength steel or the like welded to the tip of rope sheet pile etc. is used as a dummy sheet pile, and a hole is drilled in the bedrock by the method according to the above-mentioned known invention, and then the steel sheet pile is A method is used in which the material is inserted into the drilled hole.

However, in either method, the cross-sectional shape of the steel sheet pile is asymmetrical, so the vertical vibrations caused by a vibrohammer etc. are not transmitted to the rock in a well-balanced manner, and the low rigidity of the steel sheet pile causes buckling at its tip. In order to
There was a problem in that it was not possible to drive steel sheet piles into very hard rock, and there was a limit to the strength of the rock that could be driven.

C Problems to be Solved by the Invention The present invention has been made to solve the above-mentioned conventional problems, and it is possible to use steel sheet piles even in strong rock that was conventionally considered impossible to drive. The object of the present invention is to provide a method for driving steel sheet piles into bedrock that enables the driving of steel sheet piles into bedrock.

[Means to solve the problem]

In order to solve the above problems, the method of driving steel sheet piles into bedrock according to the present invention uses a member having a cross-sectional shape that is the same as or matching the cross-sectional shape of the steel sheet pile to be driven, and a member that is almost symmetrical to the member. A dummy sheet pile that has a reinforcing member that forms the cross-sectional shape, either integrally or by welding, is driven into the bedrock using a method such as a pipe opening hammer or a jet of water from the tip of the dummy sheet pile. After drilling a hole, a steel sheet pile is inserted into the hole.Since the dummy sheet pile is reinforced with reinforcing members and has high rigidity, it can be easily drilled even in hard rock. In addition, since the dummy sheet pile has a substantially symmetrical cross-sectional shape, it is possible to perform well-balanced and accurate driving when using a vibrohammer or the like.

In addition, as the above-mentioned dummy sheet pile, processing was performed on both ends of one flange of H-shaped steel having a nearly symmetrical cross-sectional shape,
A hole may be drilled into the bedrock using a dummy sheet pile, a portion of which has a cross-sectional shape that matches the cross-sectional shape of the steel sheet pile to be driven.

〔Example〕

Each embodiment of driving rope sheet piles into bedrock by applying the method of the present invention will be described below with reference to the drawings. First, Fig. 1-A is an explanatory diagram of the first embodiment. As shown in Fig. 5, the procedure for driving temporary steel piles using the sheet pile driving method is as follows: For example, 1 span S is 10m
Prepare a guide frame 1 in which two H-type MIAs are arranged in parallel,
After setting this in the state shown in Fig. 1-A, a set of two dummy sheet piles 2 shown in Fig. 1-B is suspended by a crawler crane 3, and is operated by a generator 4 and a vibro unit 5. Vibrohammer 6, submersible pump 7 and water tank 2
Jet pump 8 connected to 0, pipe steadying fitting l
Using the jet pipe 10 in l, as before, discharge jet water from the tip of the jet pipe IO and use the pipe opening hammer 6 to drive the -C along the inside of the two H-shaped steel IA of the guiding frame 1. do.

As shown in Fig. 6-A, this dummy sheet pile 2 is attached to both ends of one flange of an H-shaped steel 2A having a substantially symmetrical cross-sectional shape, and is fitted with a material that matches the cross-sectional shape of the steel sheet pile 9 shown in Fig. 2-B.
For example, a V-shaped member 2B is welded, and each processed end has a weld joint 9A and a weld joint 9A provided at both ends of the steel sheet pile 90 shown in FIG. A member that forms the bulge of the joint portion such as the water-stop grout filling portion 9B, that is, the dummy sheet pile 2 for the two-sheet set shown in Fig. 6-A, the L-shaped member 2C for guide, and the corresponding perforation of the joint portion. A temporary member 2E for drilling a welded joint is provided on both sides of the connecting portion of the L-shaped member 2D and the two H-shaped steel members 2A.

Two sets of dummy sheet piles 2 for the two-sheet set as described above are prepared, and with the dummy sheet piles 2 placed at the tip shown by arrow A in Figure 1-B remaining, the L-shape for the guide is prepared. For member 2C, dummy arrow Fi2 for the next two-piece set indicated by arrow B
The procedure of placing the L-shaped member 2D for perforating the joint part along the joint part is repeated, and the dummy arrow 2 is placed for one span S.

The above-mentioned dummy sheet pile 2 for the two-sheet set is composed of an H-shaped w42A having a substantially symmetrical cross-sectional shape, and by performing the above-mentioned processing on one flange, the cross-sectional shape of the steel sheet pile 9 to be driven is changed. The dummy sheet pile 2A is formed with a cross-sectional shape that matches the
Since it forms a nearly symmetrical cross-sectional shape by itself, the cross-section is well-balanced, and its rigidity is significantly increased compared to conventional ones.

Next, after drilling a hole in the bedrock using the dummy sheet pile 2 as described above, a 2-B
The two steel sheet piles 9 welded together at the welded joint 9A in the figure are inserted in the order of arrows A and B using the vibro hammer 6 using jet water in combination with the same method as when driving the dummy sheet piles 2.

This completes the driving of the steel sheet piles into the bedrock.

Since there is a gap between the bedrock and the steel sheet pile 9 in the above-mentioned inserted state, if water-tightness is required, as shown in FIG. - Inject the foot protection grout G from the injection plant 13 and the grout pump 14 through the foot protection grout pipe 12 shown in Figure B, and insert the steel sheet piles 9 again, and do this for all the steel sheet piles 9 one after another. However, in this case, the above-mentioned foot hardening grout G shall be poured after the steel sheet pile 9 shown in Fig. 2-A has been inserted for several spans that are not affected by the jet water.

Furthermore, the water stop grout filling pipe 15 is inserted into the water stop grout filling part 9B shown in FIG. Injection hose 17 suspended from
The joint grout injection is completed by filling the water stop grout filling part 9B via the water stop grout filling pipe 15, and the installation work of the steel sheet pile 9 with water stop properties is completed in the state shown in Fig. 4-B. .

Note that A in Figure 6-A, which is a plan view of the dummy sheet pile 2,
- As shown in Figure 6-B showing the lower end of the cross section in the A direction《
Since the guide L-shaped member 2C is not required up to the lower end, it is notched at the lower end as indicated by the arrow X.
As shown in Fig. 6-C, which is a cross-section taken in the B-B direction of Fig. 6-B, the lower end of the L-shaped member 2D for drilling the joint is the part that directly contacts the rock, so the reinforcing plate 18 is welded to it. It is reinforced by doing so.

In the first embodiment described above, the dummy sheet pile 2 for a two-sheet set is used to drive a set of two steel sheet piles 9, but as in the second embodiment shown in FIG. dummy sheet pile 2
It is also possible to drive the steel sheet piles 9 one by one using a dummy sheet pile 2. In this case, at both ends of the dummy sheet pile 2, there are an L-shaped member 2C for guiding and a corresponding L-shaped member for drilling the joint part. 2D is provided.

In addition, both ends of the dummy sheet pile 2 may be made into the same shape as the joint of the sheet pile.

Furthermore, in each of the first and second embodiments described above, the bulges for the joint portions of the steel sheet piles 9 are provided at both ends of the dummy sheet piles 2, and as a result, the holes at the joint portions are completely drilled into the rock mass. , the water-stop grout can be easily and completely filled into the joint portion, and the water-stop effect is improved.

Further, in each of the above embodiments 1.2, ordinary steel is used for the dummy sheet pile 2, but for harder rock, high-strength steel may be used for the tip of the dummy sheet pile 2.

Next, the dummy sheet piles 22 used in the method of driving steel sheet piles into bedrock in Example 3 in FIG. 8 and Example 4 in FIG. Steel sheet pile 22 having the same or matching cross-sectional shape
A reinforcing member 22B forming a substantially symmetrical cross-sectional shape is welded to A. Also in this case, this reinforcing member 22B
The cross-sectional shape is almost symmetrical to improve balance and increase rigidity, so even when long steel sheet piles are being driven, the central part of the steel sheet piles will be curved, causing the steel sheet piles to bend. There is no possibility of sections coming off or welding or melting of steel sheet pile sections due to frictional heat.

In addition, also in the case of these Examples 3 and 4, when the rock is hard, it is good to use high-strength steel for the tip part of the steel sheet pile 22A of the dummy sheet pile 22 and the reinforcing member 22B.

In addition, in the third embodiment shown in FIG. 8, the steel sheet pile 2 of the dummy sheet pile 22 is
2A, reinforcing members 22B are attached to the entire upper and lower parts of the steel sheet pile 2A, whereas in Embodiment 4 shown in FIG.
The use of the dummy sheet pile 22 which is not attached to the upper and lower ends of 2A and which does not have the reinforcing members 22B at the upper and lower ends is when the rock mass is relatively soft. in this case,
The range in which the reinforcing member 22B is not provided is determined as appropriate depending on the strength of the rock mass.

Next, a construction procedure for driving steel sheet piles 9 into bedrock using the dummy sheet piles 22 of Example 3.4 will be described.

First, as shown in FIG. 10, three dummy sheet piles 22 indicated by A, B, and C are placed along the guiding frame 1 described in Example 1, and then, as shown in FIG. Pull out the dummy sheet pile 22 shown at A in FIG.
Insert the steel sheet pile 9 indicated by Y to be cast using as a guide. Further, as shown in FIG. 12, the dummy sheet pile 22 shown by A in FIG. 10 is used as the dummy sheet pile 22 shown by D next to the dummy sheet pile 22 shown by C and is driven.

Next, pull out the dummy sheet pile 22 indicated by B, insert the next steel sheet pile 9 to be placed between the steel sheet pile 9 indicated by Y and the dummy sheet pile 22 indicated by C, and repeat the above procedure. Construction.

In the above procedure, three dummy sheet piles 22 were used.
This is because there is a risk that steel sheet piles 2 will rise together. If there is no risk, the steel sheet piles 9 may be cast using two dummy sheet piles 22, or the dummy sheet piles 22 may Of course, it is also possible to use a two-disc set.

[Effects of the Invention] As explained above, according to the method of the present invention, since a dummy sheet pile with high rigidity and a symmetrical cross-sectional shape is used, well-balanced and accurate driving is performed, and the vibrohammer is effective. Vertical vibrations are efficiently transmitted to the bedrock, increasing the drilling capacity, so steel sheet piles can be driven into hard rock where conventional driving was not possible.

Moreover, if the method of the present invention is applied to rock that can be drilled using conventional methods, the drilling capacity will be increased, so there is an effect that the work efficiency will be improved.

[Brief explanation of drawings]

Figure 1-A is an explanatory diagram of the work process when driving dummy sheet piles in Example 1 of the present invention, Figure 1-B is a plan view of driving the dummy sheet piles in Figure 1-A, and Figure 2-A is An explanatory diagram of the work process when inserting steel sheet piles, Figure 2-B is a plan view of steel sheet pile driving in Figure 2-A, Figure 3 is a work process diagram of foot protection grout injection, and Figure 4-A is a joint An explanatory diagram of the work process during grout injection. Figure 4-B is a plan view showing the state in which the steel sheet piles have been completed in a continuous manner with water-stop properties. Figure 5 is the assembled state of the guide frame shown in Figure 1-A. The perspective view shown in Figure 6-A is a plan view of the dummy sheet pile for two sheets in the embodiment shown in Figure 1-A, and Figure 6-B is a perspective view.
The figure is a sectional view showing the lower end in the A-A direction of Fig. 6-A, Fig. 6-C is a plane sectional view in the B-B direction of Fig. 6-B, and Fig. 7 is an embodiment of the present invention. 8 is a perspective view of the dummy sheet pile used in Embodiment 3 of the present invention, and FIG. 9 is a dummy sheet pile used in Embodiment 4 of the present invention. The perspective views of FIG. 10, FIG. 11, and FIG. 12 are Embodiment 3 of FIG.
FIG. 3 is a plan sectional view for explaining the procedure for driving steel sheet piles using dummy sheet piles. 2... Dummy sheet pile, 2A... H-shaped steel, 2B... V-shaped member, 2C... L-shaped member for guide, 2D
...L-shaped member for drilling in the joint, 2E...Plate member for drilling in the joint, 6...Hive mouth hammer 8...
Jet bomb, 9... Steel sheet pile, 22... Dummy sheet pile, 22A... Steel pile, 22B... Reinforcement member. Figure 1-A Figure 1-B Figure 2-A Figure 2-B Figure 6-A Figure 6-B? Figure 8 Figure 8

Claims (1)

[Claims] 1. After drilling a hole in the rock using a dummy sheet pile that has a cross-sectional shape that matches the cross-sectional shape of the steel sheet pile to be driven and has a substantially symmetrical cross-sectional shape, A method of driving steel sheet piles into bedrock by inserting the steel sheet piles into drilled holes. 2. A dummy sheet pile is used, in which both ends of one flange of an H-shaped steel with a nearly symmetrical cross-sectional shape are processed to form a cross-sectional shape that matches the cross-sectional shape of the steel sheet pile to be driven. The method for driving steel sheet piles into bedrock according to claim 1. 3. The steel sheet pile on the bedrock according to claim 1, using a dummy sheet pile consisting of a member having a cross-sectional shape matching the cross-sectional shape of the steel sheet pile to be driven and a reinforcing member having a cross-sectional shape almost symmetrical to the member. Pouring method.