JP2987141B1 - Preceding machine for water injection in steel sheet pile joint - Google Patents

Abstract

A high-pressure hose (6) is attached to the upper end of a rectangular main pipe having a jet nozzle (2) fixed to the tip, and the high-pressure hose (6) is attached to the high-pressure hose at an appropriate interval by a mounting bracket (10). An internal water jet precedence machine with a steel sheet pile joint on which an adjusting lot 14 is mounted on a head at a vertical portion of the main pipe, and a steel sheet pile joint 12
When press-fitting into the ground while fitting into the joint of a steel sheet pile that has been press-fitted in advance, the frictional resistance is reduced by preventing compaction of debris that enters the joint while blowing out high-pressure water into the joint. A method using a water jet precedence machine, which is capable of performing a press-fitting work smoothly. [Effect] Since the inside of the joint portion of the steel sheet pile is press-fitted while being jet-cleaned, resistance at the time of press-fitting of the joint portion is reduced, and damage such as deformation and torsion of the steel sheet pile can be prevented, and the steel sheet pile can be used repeatedly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a preceding machine for water injection in a steel sheet pile joint.

[0002]

2. Description of the Related Art Steel sheet piles are used in civil engineering work, construction work, electric power work, railway work, and all other fields of construction. It is mainly used for walls that support lateral loads, such as temporary cutoffs, and for other purposes such as marginal settlement of ground subsidence, prevention of sand flow, reinforcement of foundations, and seismic reinforcement.

[0003] That is, the steel sheet pile construction method has many excellent features, and its application is roughly classified into those for permanent structures and those for temporary structures. The wall for permanent structures can be classified into a structural wall supporting a lateral load such as earth pressure and water pressure, and a wall for the purpose of stopping water without a lateral load. Temporary structures are mainly used for structural walls that support lateral loads, such as earth retaining and temporary deadlines. In addition, it is used for cutting of land subsidence, prevention of sand flow, reinforcement of foundations, seismic reinforcement, etc. The uses of steel sheet piles are broadly divided into permanent structures and temporary structures, as described above.The uses of steel sheet piles are in harmony with the advantages of the press-in method and the characteristics of steel sheet piles. It has spread to all fields such as electric power construction and railway construction.

[0004] However, when a steel sheet pile is press-fitted into the ground at the construction site, press-fitting work is performed using a hydraulic pile press-in pull-out machine. Therefore, the upper end portion of the entire length of the steel sheet pile is vertically pressed into the ground one by one while leaving the hydraulic pile press-in / draw-out machine on the ground surface up to a length capable of running at an hour. A strong continuous wall can be made by press-fitting while fitting each steel sheet pile joint. However, the soil condition of the ground varies depending on the stratum composition, the presence or absence of groundwater, the type of soil, and the nature of the soil, and depending on the soil condition, single press-fitting with a hydraulic pile press-in / pull-out machine may not be appropriate. In this case, there are a water jet assisted combined construction method and an earth auger assisted combined construction method.

[0005] The water jet method mentioned above is to increase the water pressure between the soil particles by blowing high-pressure water onto the ground at the lower end of the steel sheet pile. Then, the steel sheet pile is pushed into the ground where the soil particles can be easily moved by the press-in of the hydraulic pile press-in / pull-out machine. As a result, the shear resistance of the soil at the tip of the steel sheet pile is reduced as compared with the single press-fitting of the hydraulic pile press-in and pull-out machine, and the frictional resistance is reduced by acting as a lubricant, such as preventing compaction of debris sticking to the steel sheet pile. It is a construction method to reduce. The earth auger auxiliary method is a method of press-fitting into the hard ground, which is not suitable for the water jet auxiliary method. The ground at the lower end of the center of the steel sheet pile is pre-drilled with an earth auger. This is a method of simultaneously performing press-fitting work.

[0006]

However, no matter which construction method is used, when a load is applied to press-fit a steel sheet pile with a hydraulic pile press-in / pull-out machine, the soil at the joint end of the steel sheet pile is compressed and the shear resistance is reduced. Increase. This increase in shear resistance causes deformation and torsion of the joint portion of the steel sheet pile, and damages the joint section. Not only is the strength of the steel sheet pile not obtained, but also the steel sheet pile cannot be regenerated after being pulled out. In addition, the aforementioned water
In the jet method, a large amount of high-pressure water is blown out from the center of the steel sheet pile, so that the amount of water used increases and the work of muddy water treatment is added. By loosening the ground with high water pressure, it is easier to press-fit steel sheet piles, but the joints fit into the joints of other steel sheet piles and the joints are narrow, so it is inevitable that soil and sand are clogged. was there.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the gist of the present invention is to insert a high-pressure water jet preceding machine into a joint of a steel sheet pile and insert the steel sheet pile into the joint. It is an object of the present invention to provide a steel sheet pile joint internal water injection precedence machine that press-fits and prevents the compaction of debris in the joint while washing attached soil.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 2, reference numeral 1 denotes a main pipe in the shape of a letter. A jet nozzle 2 is fixed to the tip of the main pipe, and a thread is provided at the upper end. Reference numeral 6 denotes a high-pressure hose.
The lower part of the screw 6 is screwed into the thread part of the main pipe 1 and attached integrally with a nut. Reference numeral 3 denotes a reinforcing rib provided integrally between the upper portion of the main pipe 1 and the vertical portion 9. Reference numeral 4 denotes a mounting plate integrally provided on the opposite side of the reinforcing rib 3 on the upper portion of the main pipe 1, and a shackle 7 is mounted in a hole of the mounting plate 4. Reference numeral 8 denotes a wire which is tied to the shackle 7 at its tip and is integrally fixed to the high-pressure hose 6 at appropriate intervals by a mounting bracket 10 as it extends upward. Reference numeral 14 denotes an adjustment lot to be mounted on the head 5 of the vertical portion 9 of the main pipe 1.

(Operation) The press work of the steel sheet pile at the construction site is performed by a hydraulic pile press-in and pull-out machine 13 as shown in FIG. As a peripheral device, a hydraulic pile press-in / pull-out machine 13
The power source is a hydraulic unit 15 for supplying hydraulic pressure and electric power, which is connected to a hydraulic hose and a power cable, and a hydraulic pile press-in / pull-out machine 1
A crane (not shown) for setting the steel sheet pile 11 in the water jet pump 3 and a water jet pump 16 provided with a water guide pipe when using high water pressure such as a water jet auxiliary combined method. A water tank for storing water (not shown)
After installing them at the construction site according to the work process, work begins. The press-fitting work of the steel sheet piles 11 is performed by connecting the U-shaped steel sheet piles alternately one by one while fitting the joint portions 12 into each other, and press-fitting the steel sheet piles 11 into a concave-convex shape when viewed from the plane of the steel sheet piles 11, thereby further increasing rigidity. Becomes First, after the first steel sheet pile 11a is pressed into the ground 17 by the hydraulic pile press-in / pull-out machine 13, as shown in FIG. Then, the jet nozzle 2 at the tip end of the steel sheet pile joint in-water jet preceding machine of the present invention is inserted so as to face downward in the ground 17. After inserting the adjust lot 14 thereon, the second steel sheet pile 11b
Is mounted on the adjusting lot 14 above the steel sheet pile joint inner water injection precedence machine, and press-fitted from above the second steel sheet pile 11b by the hydraulic pile press-in / pull-out machine 13, the second steel sheet pile is 11b and the preceding machine for injecting water into the steel sheet pile joint are pushed into the ground 17 together. At this time, high-pressure water flows from the water jet pump 16 to the high-pressure hose 6 attached to the steel sheet pile joint internal water injection precedence machine, and the high-pressure water is jetted from the jet nozzle 2 at the tip while lowering the inside of the ground 17. Then, while the inside of the joint portion 12 is being washed, compaction of the debris is prevented, frictional resistance is reduced, and the press-fitting operation is performed smoothly. First steel sheet pile 11a at a certain height above the ground surface
After press-fitting the second steel sheet pile 11b so as to have the same height as the above, the wire-8 attached to the steel sheet pile joint in-water injection precedence machine
And the high-pressure hose 6 are pulled up. At this time, the adjusting lot 14 is disposable in the ground as it is. This operation is sequentially repeated to press-fit the third and fourth sheets and the sheet pile 11.

However, the overall length of the sheet pile 11 is slightly different. Since the hydraulic pile press-in / pull-out machine 13 works on the upper end of the steel sheet pile 11 while traveling by itself, it must be at a certain height from the ground surface. Therefore, as shown in FIG. 4, the lower end of the steel sheet pile 11 has some length variation. As shown in FIG. 5, when the steel sheet pile joint internal water jet precedence machine of the present invention is pulled up, when the steel sheet pile 11 pressed in later is shorter, as shown in FIG. The water jet precedence machine cannot be lifted because the tip is inserted. The adjusting lot 14 is used for that case. That is, as shown in FIG.
After injecting high-pressure water by the length difference of one, that is, the position where the steel sheet pile joint inner water jet preceding machine comes out of the joint portion 12, the steel sheet pile joint inner water jet preceding machine is pulled up. Adjust lot 14 according to the difference in length of steel sheet pile 11
One or a plurality of these are appropriately used.

[0010]

According to the present invention, since the inside of the joint portion of the steel sheet pile is press-fitted while being jet-cleaned, resistance at the time of press-fitting of the joint portion is reduced, and deformation such as deformation and twisting of the steel sheet pile can be prevented. Can be expected. The amount of water used is smaller than that of the conventional water-jet assisted combined method, and the associated muddy water treatment can be reduced. The number of press-fitted steel sheet piles per day is stabilized.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a use state of an apparatus of the present invention.

FIG. 2 is a front view of the device of the present invention.

FIG. 3 is a plan view showing a use state of the device of the present invention.

FIG. 4 is a reference front view showing a construction state using the apparatus of the present invention.

FIG. 5 is a reference enlarged front view showing a use state of the device of the present invention.

FIG. 6 is a reference enlarged front view showing a use state of the device of the present invention.

[Description of Signs] 1 Main pipe 2 Jet nozzle 3 Reinforcement rib 4 Mounting plate 5 Head 6 High pressure hose 7 Shackle 8 Wire 9 Vertical section 10 Mounting bracket 11 Steel sheet pile 11a Steel sheet pile after press-fit 11b Steel sheet pile during press-fit 12 Joint 13 Hydraulic pile press-in / pull-out machine 14 Adjust lot 15 Hydraulic unit 16 Water jet pump 17 Ground

Claims (1)

(57) [Claims] 1. A high-pressure hose is attached to the upper end of a rectangular main pipe to which a jet nozzle is fixed at a tip, and a reinforcing rib is provided on an upper part and a vertical part of the rectangular main pipe, and a hole is provided on a side opposite to the reinforcing rib. A mounting plate is integrally formed on each of the V-shaped main pipes, a shackle is mounted on a hole of the mounting plate, a wire is tied to the shackle, and a wire is mounted at an appropriate interval on a high-pressure hose as the wire goes upward. An internal water jet precedence machine with steel sheet pile joints mounted with metal fittings and an adjustment lot placed on the head in the vertical part of the main pipe.