JP7389932B1 - How to join steel pipe sheet piles - Google Patents

Abstract

An object of the present invention is to provide a method for joining steel pipe sheet piles, which allows each compartment to be reliably cleaned, removed, and filled with filler no matter what state of engagement the joint steel pipes are in.
[Solution] In this method of joining steel pipe sheet piles, after the joint steel pipes 4 and 5 are engaged with each other, a cleaning rod 9 is inserted into selected compartments A and C, and high-pressure water is sprayed from the cleaning rod 9. After cutting and discharging the earth and sand 13 in the compartments A and C selected by 12, and cutting and discharging the earth and sand 13 in the adjacent compartment B using high-pressure water 12 through the communication ports 7 and 8, The filler is filled into the compartments A and C, and also into the adjacent compartment B through the communication ports 7 and 8.
[Selection diagram] Figure 4

Description

The present invention relates to a method for joining steel pipe sheet piles used when connecting steel pipe sheet piles.

In a continuous steel pipe sheet pile wall 1 used for an earth retaining wall, a steel pipe sheet pile well foundation, etc., adjacent steel pipe sheet piles 2 are connected via a joint structure 3, as shown in FIG.

This type of joint structure 3 for steel pipe sheet piles 2 and 2 (hereinafter referred to as steel pipe sheet pile joint) is such that a pair of joint members 4 and 5 supported on the outer periphery of adjacent steel pipe sheet piles 2 and 2 are engaged with each other. The so-called "PP type" joint is widely used as a standard joint.

In the "PP type" joint, joint steel pipes 4 and 5 are fixed to the outer peripheral surfaces of both adjacent steel pipe sheet piles 2 and 2, respectively, and the joint steel pipes 4 and 5 are passed through the slits 6 formed in the joint steel pipes 4 and 5. By engaging the steel pipes 4 and 5, three compartments A, B, and C separated from each other by the joint steel pipes 4 and 5 are formed, as shown in FIG. 11.

After the steel pipes 4 and 5 for both joints are engaged, the inside of the steel pipes for both joints is generally cleaned in each compartment A, B, and C, and the earth and sand in each compartment A, B, and C is removed from the outside. After that, the steel pipes 4 and 5 for both joints are filled with filler such as mortar.

In order to clean the interior of the steel pipes 4 and 5 for joints, a double supply pipe in which a high-pressure water supply pipe is arranged inside the air supply pipe is sequentially inserted into each compartment in the steel pipe for joints, and excavation is performed using high-pressure water. There is a known method that uses the upward force of air bubbles generated in high-pressure water by air injected from an air supply pipe to raise the soil toward the upper opening of each compartment and discharge it to the outside through the opening ( For example, see Patent Document 1).

Regarding earth removal, a method is also known in which earth and sand are removed from each compartment by inserting an earth removal pipe into each compartment without using the double pipe described above, and through the earth removal pipe.

Furthermore, when filling with a filler such as mortar, a filler supply pipe such as a tremie tube is inserted into each compartment, and the filler such as mortar is introduced through the filler supply pipe.

In the steel pipe sheet pile foundation 1, the structural calculation is based on the design concept that the entire foundation consisting of the plurality of steel pipe sheet piles 2, 2 behaves as one, so the engagement of the joint steel pipes 4, 5 ( It is said that the fitting condition and the cleaning and filling of the joint steel pipes 4 and 5 affect the rigidity of the foundation as a whole.

Japanese Patent Application Publication No. 2012-158981

However, due to the influence of penetration resistance due to earth and sand during steel pipe sheet pile driving and the erection accuracy of the steel pipe sheet piles 2, 2, the actual engagement (fitting) state of the steel pipes 4, 5 for both joints is not as shown in Fig. 11 (a). ) may be in a biased state other than the standard engagement (fitting) shown in FIGS. 11(b) and 11(c).

In such a biased engagement (fitting) state, the widths of the compartments A, B, and C formed by the engagement of the joint steel pipes 4 and 5 are biased, and the narrow compartments are Since it may be difficult to physically insert a cleaning rod or the like, there is a concern that the inside of the joint steel pipe may be insufficiently cleaned or filled with filler such as mortar.

Furthermore, regarding the vertical shear mechanical properties of the joint steel pipe, laboratory experiments have shown that the maximum vertical shear strength is determined by the loss of adhesion between the joint steel pipe and the filler such as mortar in the central compartment B. be.

In other words, in order to maximize the shear strength of the joint steel pipes 4 and 5, it is especially important to reliably fill the central compartment B with filler material, as shown in FIG. 11(c). Therefore, even if the central compartment B is in the engaged (fitted) state where it becomes narrow, after properly cleaning and discharging the soil from the central compartment B, it is possible to reliably fill the central compartment B. It is desirable to fill it with a filler such as mortar.

Therefore, in view of such conventional problems, the present invention provides a steel pipe that allows each compartment to be reliably cleaned, soil removed, and filled with filler material no matter what state of engagement the joint steel pipe is in. This was developed for the purpose of providing a method for joining sheet piles.

The feature of the invention according to claim 1 for solving the above-mentioned conventional problem is to connect the joint steel pipes fixed to the outer sides of adjacent steel pipe sheet piles to the vertically oriented steel pipes formed on the joint steel pipes. After they are engaged with each other through the slits, the three adjacent compartments formed by the engaged steel pipes for joints are cleaned, and the soil is removed from each compartment. In a method for joining steel pipe sheet piles in which a filler is filled and the steel pipe sheet piles are joined via both joint steel pipes, a joint steel pipe is inserted along the slit in a portion separating adjacent compartments of the joint steel pipe. A plurality of communication ports through which the filling material can flow through the inside and outside of the cell are formed by forming a central reduced communication port formed in the shape of a tapered hole in which the opening on the side of the central compartment constituting the communication ports becomes narrower, and an end The joint steel pipes are provided so that the end-side reduction communication ports formed in the shape of a tapered hole in which the opening on the compartment side of the joint is narrow are arranged alternately at intervals in the pipe axis direction. After engaging the central compartment or the two compartments at both ends adjacent to the central compartment, select the central compartment or the two compartments at both ends adjacent to the central compartment. A cleaning rod is inserted into the chamber , and while lowering the cleaning rod, the high pressure water jetted from the cleaning rod cuts the earth and sand in the selected central compartment or the two compartments at both ends , and a cleaning step of cutting earth and sand in the selected central compartment or the two compartments at both ends and adjacent compartments with the high-pressure water through the communication port; and After passing through the earth removal step of discharging the cut earth and sand from the chamber as well as the earth and sand in the selected central compartment or the two compartments at both ends and adjacent compartments through the communication port, Filling the selected central compartment or the two compartments at both ends with the filling material, and at the same time filling the compartments adjacent to the selected central compartment or the two compartments at both ends through the communication port. It is about filling.

A feature of the invention according to claim 2 is that, in addition to the configuration of claim 1 , the cleaning rod includes an air supply pipe that supplies compressed air, and a high-pressure pipe that supplies high-pressure water piped inside the air supply pipe. The cleaning step and the soil removal step include jetting the high-pressure water from an injection nozzle connected to the high-pressure water supply pipe to the selected central compartment. Or cutting the earth and sand in the two compartments at both ends and the selected center compartment or the compartments adjacent to the two compartments at both ends , and injecting the compressed air from the injection port as necessary. , the earth and sand cut by the rising force of bubbles generated in the high-pressure water are removed together with the high-pressure water into the selected central compartment or the two compartments at both ends; and the selected central compartment or the two compartments at both ends. The purpose is to lift the soil upwards from one compartment to the next to remove the soil.

A feature of the invention according to claim 3 is that, in addition to the configuration of claim 1 , the high-pressure water nozzle or the cleaning rod is rotated around the tube axis while jetting the high-pressure water diagonally backward on the opposite side of the rotation direction. It's about letting people know.

The feature of the invention according to claim 4 is that, in addition to the structure of claim 1 , the soil removal step includes the selected central compartment, two compartments at both ends, and/or the selected central compartment. The method involves inserting an earth removal pipe into the chamber or two adjacent compartments at both ends , and sucking the cut earth and sand through the earth removal pipe.

A feature of the invention set forth in claim 5 is that, in addition to the structure of claim 1 , a cleaning brush is provided on the outer peripheral surface of the cleaning rod.

A feature of the invention set forth in claim 6 is that, in addition to the configuration of claim 4 , a cleaning brush is provided on the outer circumferential surface of the earth discharge pipe.

The method for joining steel pipe sheet piles according to the present invention has the structure of claim 1, so that the steel pipes for both joints are biased due to the influence of penetration resistance due to earth and sand during driving of the steel pipe sheet piles, the erection accuracy of the steel pipe sheet piles, etc. Even if it is difficult to insert a cleaning rod, earth removal pipe, tremie pipe, etc. into any of the compartments, each compartment can be reliably cleaned, removed, and filled with filler material through the communication port. can do. Moreover, it is not necessary to wash, remove soil, and fill with filler for each compartment, and the construction period can be shortened. In addition, in the present invention, regardless of whether a central compartment or an end compartment is selected, it is preferable to allow high-pressure water, air, earth and sand, mortar, and other fillers to flow between adjacent compartments. can be done.

Furthermore, in the present invention, by providing the structure of claim 2 , the earth and sand can be efficiently lifted up to the upper opening side of each compartment with the high-pressure water by the upward force caused by the bubbles generated in the high-pressure water.

Further, in the present invention, by providing the configuration of claim 3 , the high-pressure water injected through the communication port can be reliably applied to the selected compartment and the adjacent compartment.

Furthermore, in the present invention, by providing the structure of claim 4 , the negative pressure of the earth removal pipe inserted into the selected compartment through the communication port is applied to the selected compartment and the adjacent compartment, and the adjacent compartment is Earth can be removed without inserting an earth removal pipe into the compartment.

Moreover, in the present invention, by providing the configurations of claims 5 and 6 , it is possible to remove earth and sand adhering to the inner surface of the joint steel pipe during the cleaning or earth removal process.

It is a partially enlarged perspective view showing an example of a steel pipe for a joint used in the method for joining steel pipe sheet piles according to the present invention. FIG. 3 is a schematic plan view showing the working state of the cleaning and soil removal process of the method for joining steel pipe sheet piles according to the present invention, in which (a) shows the case where the end compartments are selected, and (b) shows the central compartment. It is a figure which shows the state when selecting. (a) is a partially cutaway front view showing an example of a cleaning rod used in the cleaning/earth removal process, and (b) is a bottom view of the same. FIG. 3 is a cross-sectional view taken along the line XX in FIG. 2(a), showing a state in the initial stage of the washing and soil removal process. FIG. 3 is a sectional view taken along the line XX in FIG. 2(a) showing a state in which the soil has been cleaned to a position below the communication port in the cleaning and soil removal process. FIG. 3 is a cross-sectional view taken along the line XX in FIG. 2(a) showing a state in which the soil has been cleaned to a lower position in the same cleaning and soil removal process as above. FIG. 3 is a sectional view taken along the line XX in FIG. 2(a), showing a state at an initial stage of the filler filling process same as above. FIG. 3 is a cross-sectional view taken along the line XX in FIG. 2(a), showing a state in which the filler supply pipe is pulled up to a position above the communication port in the filler filling process same as above. 2(a) is a cross-sectional view taken along the line XX in FIG. 2(a), showing a state in which the filler supply pipe is pulled up to a position further above the filler filling step. It is a sectional view showing the state of joining work of steel pipe sheet piles. Planes showing the fitted state of steel pipe sheet pile joints, where (a) is the standard fitted state, (b) is the fitted state when the central compartment is wide, and (c) is the fitted state when the central compartment is narrow. It is a figure showing a fitted state.

Next, an embodiment of the method for joining steel pipe sheet piles according to the present invention will be described based on the embodiments shown in FIGS. 1 to 11. In addition, the same code|symbol is attached|subjected to the structure similar to the above-mentioned conventional example, and the code|symbol 1 in a figure is a steel pipe sheet pile continuous wall, and the code|symbol 2 is a steel pipe sheet pile which comprises a steel pipe sheet pile continuous wall.

As shown in FIG. 10, the continuous steel pipe sheet pile wall 1 includes a plurality of steel pipe sheet piles 2, 2, etc., which are vertically driven, and the adjacent steel pipe sheet piles 2, 2 are connected via a joint structure 3. There is.

This joint structure 3 includes a pair of joint steel pipes 4 and 5 supported on the outer periphery of adjacent steel pipe sheet piles 2, and both joint steel pipes 4 and 5 are engaged with each other.

As shown in FIG. 1, the pair of joint steel pipes 4 and 5 are arranged at positions facing each other on the outer peripheral surfaces of the steel pipe sheet piles 2 and 2 to be connected, respectively, and one end in the diametrical direction is welded or the like to form the steel pipe sheet piles. 2, and vertical slits 6 are formed at predetermined positions in the circumferential direction and arranged symmetrically to each other.

The slit part 6 is formed wider than the wall thickness of the joint steel pipes 4 and 5, and the joint steel pipes 4 and 5 are inserted vertically through the slit part 6, so that the joint steel pipes 4 and 5 are inserted into each other in the vertical direction. 4 and 5 are engaged with each other to form three adjacent compartments A, B, and C.

Further, the joint steel pipes 4 and 5 are provided along the slit portion 6 in a portion 4a separating adjacent compartments B and C and in a portion 5a separating adjacent compartments A and B, respectively. A plurality of communication ports 7 and 8 are provided that penetrate inside and outside the container.

The communication ports 7 and 8 include a center side reduced communication port 7 formed in the shape of a rectangular tapered hole whose upper, lower, left, and right inner edges are inclined so that the opening on the side of the central compartment B is narrower, and a center side reduction communication port 7 formed in the shape of a rectangular tapered hole with inclined inner edges on the upper, lower, left, and right sides so that the opening on the side of the central compartment B is narrower. It is composed of an end-side reduction communication port 8 formed in the shape of a rectangular tapered hole with inclined upper, lower, left and right inner edges so that the openings on the chambers A and C sides become narrower, and a center-side reduction communication port 7; The end-side reduction communication ports 8 are alternately arranged at intervals in the tube axis direction.

In this embodiment, an example has been described in which a row of communication ports consisting of the center side reduction communication port 7 and the end side reduction communication port 8 is arranged in one row. Two or more communication port rows may be arranged. In that case, the center-side reduction communication ports 7 and the end-side reduction communication ports 8 may be arranged alternately at intervals in the tube axis direction in each row, and adjacent communication port rows may be arranged in the same manner. In adjacent communication port rows, the center side reduction communication ports 7 and the end side reduction communication ports 8 are arranged in a staggered manner so that they are adjacent to each other, and the center side reduction communication ports 7 and the end side reduction communication ports 8 are arranged side by side. They may be arranged in a staggered manner. Furthermore, each row includes a plurality of center-side reduction communication ports 7 arranged at intervals in the tube axis direction, and a plurality of end-side reduction communication ports arranged at intervals in the tube axis direction. It may be a communicating port row consisting of ports 8.

Furthermore, the communication ports 7 and 8 are formed to have a width smaller than the diameter of the cleaning rod 9 and the filler supply pipe 10 such as the earth removal pipe and the tremie pipe (hereinafter collectively referred to as the cleaning rod, etc.). This prevents the cleaning rod etc. from deviating into the adjacent compartment B.

Note that the form of the communication ports 7 and 8 is not limited to the above embodiment, and may be circular (truncated cone shape) or elliptical shape (truncated ellipsoid shape). It may be formed in the shape of a notch.

Furthermore, the center side reduction communication port 7 and the end side reduction communication port 8 are made into a set of communication ports 7 and 8, and the center side reduction communication port 7 and the end side reduction communication port 8 of the set are The plurality of communication ports 7 and 8 may be arranged at intervals in the tube axis direction.

The method for joining the steel pipe sheet piles 2, 2 using such a joint 3 is that after the steel pipes 4, 5 for both joints are engaged with each other as the steel pipe sheet piles 2, 2 are placed, the steel pipes for the joint that have been engaged are The three adjacent compartments A, B, and C formed by 4 and 5 are cleaned, and the soil is removed from each compartment A, B, and C. After that, each compartment A, B, and C is filled. By filling the material 11, adjacent steel pipe sheet piles 2, 2 are joined via both joint steel pipes 4, 5.

The specific procedure for joining the steel pipe sheet piles 2, 2 will be explained based on FIGS. 4 to 9.

The actual engagement (fitting) state of the steel pipes 4 and 5 for both joints depends on the influence of penetration resistance due to the earth and sand 13 during driving of the steel pipe sheet piles 2 and 2 and the erection accuracy of the steel pipe sheet piles 2 and 2, etc., as shown in Fig. 11. There are cases where a state other than the standard engagement (fitting) shown in FIGS. 11(b) and 11(c) is deviated from the standard engagement (fitting) state shown in FIG. 11(a).

When engaged in the biased state shown in FIGS. 11(b) and 11(c), the center compartment B or the end compartments A and C adjacent to the central compartment B There may be cases where the interior of one of the compartments becomes narrow and it becomes difficult to insert a cleaning rod or the like into the narrowed compartments A, B, and C.

Therefore, after the joint steel pipes 4 and 5 are engaged, the engagement state is confirmed, and the compartments A, B, and C into which the cleaning rod etc. are inserted are placed in the central compartment B or adjacent to the central compartment B. Select either compartment A or C at the matching end.

The selection criteria was based on the fact that in order to maximize the shear strength of the joint steel pipes 4 and 5, it is important that the filler 11 is reliably filled into the central compartment B. In the case of the state shown in (a) or Fig. 11(b), the central compartment B is selected preferentially, and as shown in Fig. 11(c), the central compartment B is narrow and it is difficult to insert a cleaning rod, etc. If this is difficult, select the end compartments A and C, as shown in FIG. 2(a). Note that FIG. 2(b) is a diagram when the central compartment B is selected.

Next, as shown in FIG. 2(a) and FIGS. 4 to 6, the cleaning rod 9 is inserted into the selected compartments A and C, and the high-pressure water 12 sprayed from the cleaning rod 9 is applied to the selected compartment A. , C is cut, and the dirt 13 in compartment B adjacent to the selected compartments A and C is also cut using high-pressure water 12 through the communication ports 7 and 8 (cleaning process). 13 is carried on the upward flow of high-pressure water 12 and removed (earth removal process).

In this example, the case where the end compartments A and C are selected will be explained as an example, and the washing and soil removal process will be performed by inserting into either one of the two end compartments A and C. After that, the cleaning rod 9 may be inserted into the other end to perform the cleaning and soil removal process, and as shown in FIG. 2(a) and FIGS. 4 to 6, the two end compartments A The cleaning rod 9 may be inserted into both sections C at the same time to perform the cleaning/earth removal process. In addition, in conjunction with the insertion of the cleaning rod 9 into the compartments A and C at the selected ends, a small-diameter soil removal pipe is inserted into the central compartment B, and the earth and sand 13 in compartment B is simultaneously discharged. You may also do so.

As shown in FIG. 3, the cleaning rod 9 is a dual-layer structure consisting of an air supply pipe 15 that supplies compressed air 14 and a high-pressure water supply pipe 16 that supplies high-pressure water 12 piped inside the air supply pipe 15. Compressed air 14 or high-pressure water 12, which has a pipe structure and is supplied to an air supply pipe 15 and a high-pressure water supply pipe 16 from supply means (not shown) installed externally, respectively, is injected from an injection nozzle 17 at the tip. It is designed to let you do so.

The injection nozzle 17 is equipped at least at the lower end with a high-pressure water injection port 17a that injects high-pressure water 12, and uses the injected high-pressure water 12 to cut the earth and sand 13 in the selected compartments A and C, and remove the cut earth and sand 13. The high-pressure water 12 rising upward pushes the selected compartments A and C toward the upper openings.

In addition, the injection nozzle 17 is rotatably attached to the double tube structure around the tube axis , and has injection holes 17b, 17b opened diagonally rearward on the opposite side to the rotation direction, at one location or at opposite poles in the diametrical direction. It has a structure in which it can be freely rotated by a swivel mechanism using the force of the high-pressure water 12 jetted from the jet holes 17b, 17b.

Furthermore, the injection nozzle 17 is provided with air injection holes 17c, 17c that communicate with the air supply pipe 15, and compressed air 14 is injected from the air injection holes 17c, 17c to remove water filling the joint steel pipes 4, 5. Air bubbles are generated in the soil, and the upward force of the air bubbles promotes the upward movement of the earth and sand 13.

Although not particularly shown, the cleaning rod 9 is equipped with a cleaning brush on the outer circumferential surface of the cleaning rod 9, and the cleaning brush scrapes out and removes the dirt 13 attached to the inner surfaces of the compartments A and C. There may be.

The form of this cleaning brush is not particularly limited, and the bristles are made of vegetable fibers (palm, coir, etc.), chemical fibers (nylon, polyethylene, polypropylene, etc.), metal wires (copper, brass, iron, stainless steel, etc.), etc. Can be configured.

Moreover, the effectiveness of this cleaning brush can be increased by rotating the entire cleaning rod 9.

Then, the cleaning rod 9 is lowered in the selected compartments A and C while moving up and down as necessary to proceed with cutting and discharging the earth and sand 13 in the selected compartments A and C, as shown in FIG. When descending to the position where the communication ports 7 and 8 are formed, the water pressure of the injected high-pressure water 12 acts on the selected compartments A and C and the adjacent compartment B through the communication ports 7 and 8, and the air bubbles While cutting the earth and sand 13 in the adjacent compartment B by the suction effect of the rising water flow including Earth is removed.

At that time, since the center side reduction communication port 7 is provided as the communication ports 7 and 8 and is formed in the shape of a tapered hole where the opening on the side of the central compartment B is narrow, the center side reduction communication port 7 can be passed through. An end-side reduction communication port 8 is provided which is formed in the shape of a tapered hole to promote the flow of high-pressure water 12 into the adjacent central compartment B, and to narrow the openings on the end compartments A and C. This facilitates sucking out of the cut earth and sand 13 from the adjacent central compartments B.

In addition, when the central compartment B shown in FIG. 2(b) is selected, the communication ports 7 and 8 are formed in a tapered hole shape in which the opening on the central compartment B side is narrower. By providing the reduction communication port 7, suction of the cut earth and sand 13 from the compartments A and C at the adjacent ends is facilitated, and the opening on the side of the compartments A and C at the ends is narrowed. By providing the end-side reduction communication port 8 formed in the shape of a shape, the high-pressure water 12 is promoted to flow into the compartments A and C at the adjacent ends through the end-side reduction communication port 8.

In addition, the earth and sand 13 above the communication ports 7 and 8 in the adjacent compartment B falls to the position of the communication ports 7 and 8 due to its own weight, and is similarly cut through the communication ports 7 and 8 and is sucked out. Earth is removed.

At this time, by rotating the injection nozzle 17 around the pipe axis, even if the relative position of the cleaning rod 17 and the communication ports 7, 8 changes depending on the engagement state of the joint steel pipes 4, 5, the injection can be performed reliably. The high-pressure water 12 can be directly applied to the earth and sand 13 in the adjacent compartment B through the communication ports 7 and 8, and suction can be promoted by stirring by rotation.

The supply amount and supply pressure of high-pressure water 12 and air will be a certain amount after considering the strength and geology of the ground on which the steel pipe sheet piles 2, 2 will be driven, but may vary depending on the earth removal situation and the selected compartment. It is possible to observe the cleaning and soil removal status of compartment B adjacent to A and C, and change the supply amount and supply pressure as appropriate. Further, the supply amount and supply pressure of the high-pressure water 12 and air may be changed sequentially at each predetermined depth or time.

For example, compared to the amount of high-pressure water 12 and air supplied when cleaning and discharging soil while moving between the communication ports 7 and 8 in the pipe axis direction, the high pressure when cleaning and discharging soil near the communication ports 7 and 8 is The amount of water 12 and air supplied may be increased.

In addition, the feed speed and number of vertical movements of the cleaning rod 9 are different when cleaning and removing soil while moving between the communication ports 7 and 8 in the pipe axis direction, and when cleaning and removing soil near the communication ports 7 and 8. You may change it as appropriate.

Then, while lowering the cleaning rod 9, the above-mentioned cleaning and soil removal work is repeated until the cleaning rod 9 reaches the lower end of the selected compartments A and C, and when the soil removal by the high-pressure water 12 is sufficiently completed, the cleaning is performed. Pull up rod 9.

Next, as shown in FIGS. 7 to 9, a filler supply pipe 10 such as a tremie tube is inserted into the selected compartments A and C after the cleaning and soil removal process, and Filler material 11 such as mortar is introduced while pulling up filler supply pipe 10 from the lower end.

The filling material 11 such as mortar put into the selected compartments A and C is connected when the upper end of the filled material 11 reaches the position of the communication opening 7 and 8, as shown in FIGS. 8 and 9. The filler material 11 flows into the adjacent compartments B through the ports 7 and 8, and the adjacent compartments B are also filled with the filler material 11.

At this time, the pulling speed of the filler supply pipe 10 and the supply amount of the filler 11 may be fixed at a constant speed and amount, but the lower end of the filler supply pipe 10 is near the communication ports 7 and 8. When the filling material 11 is located, the pulling speed may be reduced and the amount of filler 11 supplied may be increased.

Then, the filler supply pipe 10 is sequentially pulled up while supplying the filler 11, and the filler 11 is filled up to the upper ends of the selected compartments A and C, and the upper end of the adjacent compartment B is also filled with the filler 11. The filling material 11 is supplied until the

In particular, in order to maximize the shear strength of the joint steel pipes 4 and 5, it is important that the filler 11 is reliably filled into the central compartment B. Check whether the filler 11 is filled up to the upper end of B.

Finally, the filling material 11 such as mortar is cured and hardened, and the joining of the adjacent steel pipe sheet piles 2, 2 is completed.

In the method for joining the steel pipe sheet piles 2 and 2 configured in this way, the communication ports 7 and 8 are provided in the steel pipes 4 and 5 for joints, and after the steel pipes 4 and 5 for joints are engaged with each other, the central gap is opened. Select either chamber B or the end chambers A and C adjacent to the central chamber B, insert a cleaning rod etc. into the selected chamber A and C, and clean the selected chamber A and C. By cleaning, removing soil, and filling with the filler 11, the selected compartments A and C and the adjacent compartment B through the communication ports 7 and 8, removing soil, and filling with the filler 11, Even if the joint steel pipes 4 and 5 are engaged in a biased state and it is difficult to insert a cleaning rod or the like into any of the compartments A, B, and C, it is possible to clean each compartment A, B, and C. Earth removal and filling with the filler 11 can be performed reliably.

Further, regardless of the engagement state of the steel pipes 4 and 5 for both joints, the cleaning rod or the like is inserted only into the selected compartments A and C, so that the construction period can be shortened.

Furthermore, in the present invention, since the filler 11 such as mortar is filled through the communication ports 7 and 8, the inner surfaces of the joint steel pipes 4 and 5 and the filler 11 such as mortar are separated by the communication ports 7 and 8. Although the adhesion area becomes smaller and the adhesion force decreases, the portions filled in the communication ports 7 and 8 function as a shear stopper, and can be expected to compensate for the decrease in shear resistance against shear displacement.

In the above-mentioned embodiment, the earth removal process was explained in the case where the earth was removed to the outside by the upward force of the high-pressure water 12 injected from the cleaning rod 9 and the bubbles generated in the crushing water. , an earth removal pipe is inserted into the selected compartment A, B, C or into a compartment adjacent to the compartment into which the cleaning rod 9 has been inserted, and the earth and sand 13 in each compartment cut by the cleaning rod 9 is passed through the earth removal pipe. It may also be possible to aspirate.

1 Steel pipe sheet pile continuous wall 2 Steel pipe sheet pile 3 Joint 4, 5 Steel pipe for joint 6 Slit portion 7 Center side reduction communication port 8 End side reduction communication port 9 Washing rod 10 Filler supply pipe 11 Filler 12 High pressure water 13 Earth and sand 14 Air 15 Air supply pipe 16 High pressure water supply pipe 17 Injection nozzle 18 Cleaning brush

Claims (6)

After the joint steel pipes fixed to the outer sides of adjacent steel pipe sheet piles are engaged with each other through vertical slits formed in the joint steel pipes, the joint steel pipes are formed by the engaged joint steel pipes. Clean the three adjacent compartments and remove soil from each compartment,
Thereafter, in the method for joining steel pipe sheet piles, the method includes filling each compartment with a filler and joining the steel pipe sheet piles via the steel pipes for both joints,
A plurality of communication ports through which the filler can flow, penetrating inside and outside of the joint steel pipe along the slit portion, are provided in a portion separating adjacent compartments of the joint steel pipe, and a central partition forming the communication ports is provided. A central reduction communication port is formed in the shape of a tapered hole with a narrow opening on the chamber side, and an end reduction communication port is formed in the shape of a tapered hole with a narrow opening on the compartment side at the end of the pipe. Provided so that they are arranged alternately at intervals in the axial direction,
After engaging the joint steel pipes, selecting either the central compartment or the two compartments at both ends adjacent to the central compartment,
A cleaning rod is inserted into the selected central compartment or the two compartments at both ends , and while the cleaning rod is lowered, high-pressure water jetted from the cleaning rod cleans the selected central compartment or both ends. a cleaning step of cutting the earth and sand in the two compartments of the part , and also cutting the earth and sand in the compartments adjacent to the selected central compartment or the two compartments at both ends using the high-pressure water through the communication port; ,
The cut earth and sand are discharged from the selected central compartment or the two compartments at both ends , and the soil is discharged through the communication port into the compartments adjacent to the selected central compartment or the two compartments at both ends. After going through the earth removal process to remove earth and sand,
The selected central compartment or the two compartments at both ends are filled with the filler material, and the filling material is filled through the communication port into the compartments adjacent to the selected central compartment or the two compartments at both ends. A method for joining steel pipe sheet piles, which is characterized by filling the steel pipe sheet piles with. The cleaning rod has a double pipe structure consisting of an air supply pipe that supplies compressed air and a high-pressure water supply pipe that supplies high-pressure water piped inside the air supply pipe,
The cleaning step and the soil removal step include spraying the high-pressure water from an injection nozzle connected to the high-pressure water supply pipe to spray the selected central compartment or the two compartments at both ends and the selected center compartment. The earth and sand in the compartment or the two compartments at both ends and the adjacent compartments are cut, and if necessary, the compressed air is injected from the injection port, and the soil is cut by the upward force of the bubbles generated in the high-pressure water. Raise the earth and sand together with the high-pressure water toward the upper part of the selected central compartment or the two compartments at both ends and the compartments adjacent to the selected central compartment or the two compartments at both ends. 2. The method for joining steel pipe sheet piles according to claim 1, wherein the earth is removed. The method for joining steel pipe sheet piles according to claim 1, wherein the high-pressure water nozzle or the cleaning rod is rotated around a pipe axis while jetting the high-pressure water diagonally backward on the opposite side of the rotation direction . The earth removal step includes inserting an earth removal pipe into the selected central compartment or the two compartments at both ends, and/ or the compartments adjacent to the selected central compartment or the two compartments at both ends. The method for joining steel pipe sheet piles according to claim 1 , wherein the cut earth and sand are sucked through the earth discharge pipe. The method for joining steel pipe sheet piles according to claim 1, wherein a cleaning brush is provided on the outer peripheral surface of the cleaning rod. The method for joining steel pipe sheet piles according to claim 4, wherein a cleaning brush is provided on the outer peripheral surface of the earth discharge pipe.

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