Connection method of steel pipe sheet pile

Abstract

To provide a connection method of steel pipe sheet piles allowing cleaning, soil removal, and filling of filler of each of cells to be securely performed even in any of engagement states of connection pipes.SOLUTION: A connection method of steel pipe sheet piles of the invention comprises: inserting cleaning rods 9 in selected cells A, C after engaging connection steel pipes 4, 5 to each other; excavating and removing sediment 13 in the selected cells A, C with high pressure water 12 injected from the cleaning rods 9; and filling filler in the selected cells A, C as well as filling filler in adjacent cells B through communication openings 7, 8 after excavating and removing sediment 13 in the adjacent cells B with high pressure water 12 through the communication openings 7, 8.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a method for joining steel pipe sheet piles used when connecting steel pipe sheet piles. [Background technology]

[0002] 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, 2 are connected via joint structures 3 as shown in FIG.

[0003] This type of joint structure (hereinafter referred to as a steel pipe sheet pile joint) 3 for steel pipe sheet piles 2, 2 is configured so that a pair of joint members 4, 5 supported on the outer periphery of adjacent steel pipe sheet piles 2, 2 engage with each other, and the so-called "PP type" joint is widely used as the standard joint.

[0004] In a "PP type" joint, a joint steel pipe 4, 5 is fixed to the outer circumferential surface of each of adjacent steel pipe sheet piles 2, 2, and by engaging the two joint steel pipes 4, 5 through slits 6 formed in the joint steel pipes 4, 5, three compartments A, B, C separated from each other by the joint steel pipes 4, 5 are formed, as shown in Figure 11.

[0005] After the two joint steel pipes 4, 5 are engaged, the insides of the two joint steel pipes are generally cleaned for each compartment A, B, C, and the soil in each compartment A, B, C is removed to the outside, and then a filler such as mortar is filled into the two joint steel pipes 4, 5.

[0006] Known methods for cleaning the inside of such steel pipes for joints 4, 5 include inserting a double supply pipe, which has a high-pressure water supply pipe inside an air supply pipe, into each compartment inside the steel pipe for joints in turn, and using the upward force of air bubbles generated in the high-pressure water by air injected from the air supply pipe to lift the soil excavated with high-pressure water toward the upper opening of each compartment and discharge it to the outside through the opening (see, for example, Patent Document 1).

[0007] Regarding soil removal, a method is also known in which, instead of using the double pipe, a soil removal pipe is inserted into each compartment and soil is removed from each compartment through the soil removal pipe.

[0008] Furthermore, when filling the filler such as mortar, a filler supply pipe such as a tremie pipe is inserted into each compartment, and the filler such as mortar is poured through the filler supply pipe.

[0009] Furthermore, for the steel pipe sheet pile foundation 1, structural calculations are based on the design concept that the entire foundation consisting of multiple steel pipe sheet piles 2,2 behaves as a single unit, and therefore it is believed that the engagement (fitting) state of the joint steel pipes 4,5 and the cleaning and filling work inside the joint steel pipes 4,5 affect the rigidity of the entire foundation. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2012-158981 A Summary of the Invention [Problem to be solved by the invention]

[0011] However, due to the influence of the penetration resistance caused by soil and sand when driving the steel pipe sheet piles and the installation accuracy of the steel pipe sheet piles 2, 2, the actual engagement (fitting) state of the steel pipes 4, 5 for both joints may be in a biased state other than the standard engagement (fitting) state shown in Figure 11(b) or Figure 11(c) rather than the standard engagement (fitting) state shown in Figure 11(a).

[0012] Furthermore, in such an uneven engagement (fitting) state, the width of each of the chambers A, B, C formed by the engagement of the joint steel pipes 4, 5 will be uneven, and it may be difficult to physically insert a cleaning rod or the like into the narrow chambers, which raises concerns that the cleaning of the joint steel pipes and the filling of filler such as mortar will be insufficient.

[0013] Furthermore, indoor experiments have shown that the maximum vertical shear strength of the joint steel pipe is determined by the loss of adhesion between the joint steel pipe and the filler material, such as mortar, in central compartment B.

[0014] In other words, in order to maximize the shear strength of the joint steel pipes 4, 5, it is particularly important to ensure that the filler is filled into the central chamber B. Even in the engaged (fitted) state in which the central chamber B is narrowed as shown in Figure 11(c), it is desirable to properly clean and remove soil from the central chamber B before reliably filling the central chamber B with mortar or other filler.

[0015] In view of the above-mentioned problems, the present invention has been made with an object of providing a method for joining steel pipe sheet piles which enables cleaning, removal of soil and filling of filler material in each compartment reliably regardless of the engagement state of the steel pipes for joints. [Means for solving the problem]

[0016] The invention described in claim 1 for solving the above-mentioned problems of the related art is characterized in that, in a method for joining steel pipe sheet piles, joint steel pipes fixed to the outer parts of adjacent steel pipe sheet piles are engaged with each other through vertical slits formed in the joint steel pipes, three adjacent compartments formed by the engaged joint steel pipes are cleaned and soil is removed from each compartment, and then each compartment is filled with a filler, and the steel pipe sheet piles are joined via both joint steel pipes, the method further comprises the steps of: forming a joint steel pipe that penetrates the inside and outside of the joint steel pipe along the slits in a portion separating the adjacent compartments of the joint steel pipe; The filler is capable of flowing Multiple communication ports, a central reduced communication port formed in a tapered hole shape with an opening on the central compartment side narrowing, which constitutes the communication port, and an end reduced communication port formed in a tapered hole shape with an opening on the end compartment side narrowing, which are alternately arranged at intervals in the tube axial direction, After the steel pipes for joints are engaged with each other, the central compartment or the adjacent central compartment is Two compartments at either end, Select one of the following, In the selected central compartment or the two compartments at both ends Insert the cleaning rod and While lowering the cleaning rod, The selected cleaning solution is then washed away by high-pressure water sprayed from the cleaning rod. Central compartment or two compartments at both ends The soil and sand in the selected area are cut, and the high-pressure water is supplied through the communication port. Central compartment or two compartments at both endsa cleaning step of cutting the soil and sand in the adjacent compartment; Central compartment or two compartments at both ends The cut soil is discharged from the selected Central compartment or two compartments at both ends and a soil removal process for removing soil from the adjacent compartments. Central compartment or two compartments at both ends and filling the selected portion with a filler through the communication port. Central compartment or two compartments at both ends and filling adjacent compartments with a filler.

[0017] Claim 2 The invention described in is characterized in that Claim 1 In addition to the above configuration, the cleaning rod has a double-pipe structure consisting of an air supply pipe for supplying compressed air and a high-pressure water supply pipe for supplying high-pressure water that is piped inside the air supply pipe, and the cleaning process and the soil removal process are performed by spraying the high-pressure water from a spray nozzle connected to the high-pressure water supply pipe to the selected soil. Central compartment or two compartments at both ends In and above selected Central compartment or two compartments at both ends The soil in the adjacent chamber is cut, and the compressed air is ejected from the ejection port as necessary, and the soil that has been cut is carried to the selected chamber together with the high-pressure water by the upward force of the air bubbles generated in the high-pressure water. Central compartment or two compartments at both ends and the selected Central compartment or two compartments at both ends The purpose of this method is to lift the adjacent compartment upward to remove soil.

[0018] Claim 3 The invention described in is characterized in that Claim 1 In addition to the above, the high pressure water Rotational direction While spraying the water diagonally backward, the high-pressure water nozzle or the cleaning rod Around the tube axis The key is to rotate it.

[0019] Claim 4 The invention described in is characterized in that Claim 1 In addition to the above, the soil removal step further comprises: Central compartment or two compartments at both ends and / or the selected Central compartment or two compartments at both ends An earth discharge pipe is inserted into the adjacent compartment, and the cut earth and sand are sucked through the earth discharge pipe.

[0020] Claim 5 The invention described in is characterized in that Claim 1In addition to the above configuration, a cleaning brush is provided on the outer circumferential surface of the cleaning rod.

[0021] Claim 6 The invention described in is characterized in that Claim 4 In addition to the above configuration, a cleaning brush is provided on the outer circumferential surface of the soil discharge pipe. Effect of the Invention

[0022] The method for joining steel pipe sheet piles according to the present invention has the configuration of claim 1, and therefore even if the steel pipes for joints are engaged offset due to the influence of the penetration resistance of soil and sand during installation of the steel pipe sheet piles or the installation accuracy of the steel pipe sheet piles, making it difficult to insert a cleaning rod, soil removal pipe, tremie pipe, etc. into any of the compartments, cleaning, soil removal, and filling with filler can be reliably performed in each compartment through the communication opening. In addition, cleaning, soil removal, and filling with filler do not have to be performed for each compartment, and the construction period can be shortened. Furthermore, in the present invention, regardless of whether a central compartment or an end compartment is selected, high-pressure water, air, soil, sand, mortar and other filler materials can be conveniently transported between adjacent compartments.

[0023] Further, in the present invention, Claim 2 By adopting this configuration, the upward force of the air bubbles generated in the high-pressure water can efficiently lift up the soil and sand together with the high-pressure water to the upper opening side of each compartment.

[0024] In the present invention, Claim 3 By providing this configuration, the high-pressure water jetted through the communication port can be reliably applied to the selected compartment and the adjacent compartment.

[0025] Further, in the present invention, Claim 4 By adopting the above configuration, the negative pressure of the earth removal pipe inserted into the selected compartment through the communication port can be applied to the compartment adjacent to the selected compartment, making it possible to remove earth without inserting the earth removal pipe into the adjacent compartment.

[0026] In the present invention, Claims 5 to 6 By providing the above configuration, soil and sand adhering to the inner surface of the steel pipe for joint can be removed in the cleaning or soil removal process. [Brief description of the drawings]

[0027] [Figure 1] FIG. 2 is a partially enlarged perspective view showing an example of a joint steel pipe used in the joining method of a steel pipe sheet pile according to the present invention. [Diagram 2] FIG. 11 is a schematic plan view showing the state of the cleaning and soil removal process of the steel pipe sheet pile joining method of the present invention, in which (a) shows the state when an end chamber is selected, and (b) shows the state when the central chamber is selected. [Diagram 3] FIG. 2(a) is a partially cutaway front view showing an example of a cleaning rod used in the cleaning and soil removal step of the embodiment, and FIG. [Figure 4] FIG. 2(a) is a cross-sectional view taken along the line XX in FIG. 2(a), showing an initial stage of the washing and soil removal process. [Diagram 5] FIG. 2(a) is a cross-sectional view taken along the line XX in FIG. 2(a) showing a state where cleaning has been completed to a position below the communication port in the cleaning and soil removal process. [Figure 6] FIG. 2(a) is a cross-sectional view taken along the arrow XX in FIG. 2(a), showing a state where cleaning has been performed to a lower position in the cleaning and soil removal process. [Figure 7] FIG. 2(a) is a cross-sectional view taken along line XX in FIG. 2(a), showing an initial stage of the filler filling step. [Figure 8] 2(a) is a cross-sectional view taken along the line XX in FIG. 2(a) showing a state in which the filler supplying pipe is pulled up to a position above the communication port in the filler filling step of FIG. [Figure 9] 2(a) sectional view taken along the line XX in FIG. 2(a) showing a state in which the filler supplying pipe has been pulled up to a position above the filler filling step. [Figure 10] FIG. 4 is a cross-sectional view showing the state of the joining work of steel pipe sheet piles. [Figure 11] These are plan views showing the fitting state of steel pipe sheet pile joints, where (a) is the standard fitting state, (b) is the fitting state when the central chamber is wide, and (c) is the fitting state when the central chamber is narrow. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Next, an embodiment of a method for joining steel pipe sheet piles according to the present invention will be described based on the examples shown in Figures 1 to 11. Note that the same components as those in the above-mentioned conventional example are described by using the same reference numerals, and in the figures, reference numeral 1 denotes a steel pipe sheet pile continuous wall, and reference numeral 2 denotes a steel pipe sheet pile constituting the steel pipe sheet pile continuous wall.

[0029] As shown in FIG. 10, the steel pipe sheet pile continuous wall 1 includes a plurality of steel pipe sheet piles 2, 2 . . . driven vertically, and adjacent steel pipe sheet piles 2, 2 are connected via joint structures 3.

[0030] This joint structure 3 includes a pair of joint steel pipes 4, 5 supported on the outer periphery of adjacent steel pipe sheet piles 2, and both joint steel pipes 4, 5 are adapted to be engaged with each other.

[0031] As shown in Figure 1, a pair of joint steel pipes 4, 5 are arranged facing each other on the outer circumferential surface of the steel pipe sheet piles 2, 2 to be connected, one end in the diametrical direction is fixed to the outer circumferential surface of the steel pipe sheet pile 2 by welding or the like, and vertical slit portions 6 are formed in a symmetrical arrangement at predetermined positions in the circumferential direction.

[0032] The slit portion 6 is formed wider than the wall thickness of the joint steel pipes 4, 5, and the joint steel pipes 4, 5 are inserted vertically through the slit portion 6 so that the joint steel pipes 4, 5 engage in a state in which three adjacent compartments A, B, and C are formed by the joint steel pipes 4, 5, as shown in Figures 2 and 10.

[0033] In addition, the joint steel pipes 4, 5 are provided with a plurality of communication ports 7, 8 that penetrate the inside and outside of the joint steel pipes 4, 5 along the slit portions 6 in the portion 4a separating adjacent compartments B, C and in the portion 5a separating adjacent compartments A, B.

[0034] The communication ports 7, 8 are composed of a central reduced communication port 7 formed as a rectangular tapered hole with inclined inner edges on the top, bottom, left and right so that the opening on the central compartment B side becomes narrower, and an end side reduced communication port 8 formed as a rectangular tapered hole with inclined inner edges on the top, bottom, left and right so that the openings on the end compartments A and C side become narrower, and the central reduced communication port 7 and the end side reduced communication port 8 are arranged alternately at intervals in the axial direction of the tube.

[0035] In this embodiment, the example in which the communication port row consisting of the center side reduced communication port 7 and the end side reduced communication port 8 is arranged in one row has been described, but two or more communication port rows consisting of a plurality of communication ports 7, 8 may be arranged in the tube axial direction. In that case, the center side reduced communication port 7 and the end side reduced communication port 8 may be arranged alternately at intervals in the tube axial direction in each row, and adjacent communication port rows may be arranged in the same arrangement, or the center side reduced communication port 7 and the end side reduced communication port 8 may be arranged in a staggered arrangement so that they are adjacent to each other in adjacent communication port rows, and the center side reduced communication port 7 and the end side reduced communication port 8 may be arranged in a staggered arrangement. Furthermore, each row may be a communication port row consisting of a plurality of center side reduced communication ports 7 arranged at intervals in the tube axial direction, and a communication port row consisting of a plurality of end side reduced communication ports 8 arranged at intervals in the tube axial direction.

[0036] In addition, the communication openings 7, 8 are formed with a width smaller than the diameter of the cleaning rod 9 and the filler supply pipes 10 such as soil discharge pipes and tremie pipes (hereinafter collectively referred to as cleaning rods, etc.) to prevent the cleaning rods, etc. from escaping into the adjacent compartment B through the communication openings 7, 8.

[0037] Furthermore, the shape of the communication openings 7, 8 is not limited to the above-mentioned embodiment, and may be circular (frustum of a cone) or elliptical (frustum of an elliptical cone), or may be formed as a notch in the side edge portion of the slit portion 6.

[0038] Furthermore, the central reduced communication port 7 and the end side reduced communication port 8 may be configured as a set of communication ports 7, 8, and multiple communication ports 7, 8 consisting of the set of central reduced communication port 7 and end side reduced communication port 8 may be arranged at intervals in the tube axial direction.

[0039] The method of joining steel pipe sheet piles 2,2 using such a joint 3 involves, after the two joint steel pipes 4,5 are engaged as the steel pipe sheet piles 2,2 are poured, cleaning the three adjacent chambers A, B, C formed by the engaged joint steel pipes 4,5 and removing soil from each of the chambers A, B, C, and then filling each of the chambers A, B, C with filler material 11, thereby joining the adjacent steel pipe sheet piles 2,2 via the two joint steel pipes 4,5.

[0040] A specific procedure for the joining method of the steel pipe sheet piles 2, 2 will be described with reference to Figs.

[0041] Due to the influence of the penetration resistance caused by the soil 13 when the steel pipe sheet piles 2,2 are driven and the installation accuracy of the steel pipe sheet piles 2,2, the actual engagement (fitting) state of the steel pipes 4,5 for both joints may be in a biased state other than the standard engagement (fitting) state shown in Figure 11(b) or Figure 11(c) rather than the standard engagement (fitting) state shown in Figure 11(a).

[0042] If the engagement is biased as shown in Figure 11(b) or Figure 11(c), the interior of the central compartment B or one of the end compartments A and C adjacent to the central compartment B will become narrow, making it difficult to insert a cleaning rod or the like into the narrowed compartments A, B, C.

[0043] Therefore, after the steel pipes 4 and 5 for the joints are engaged with each other, the engagement state is checked and the compartments A, B, and C into which the cleaning rod, etc., is inserted are selected from either the central compartment B or the compartments A and C at the ends adjacent to the central compartment B.

[0044] The selection criteria are as follows: in order to maximize the shear strength of the joint steel pipes 4 and 5, it is particularly important that the filling material 11 is reliably filled into the central compartment B, so in the state shown in Figure 11(a) or 11(b), the central compartment B is selected first, and in the state shown in Figure 11(c), where the central compartment B is narrow and it is difficult to insert a cleaning rod or the like, the end compartments A and C are selected as shown in Figure 2(a). Note that Figure 2(b) is a diagram of the case where the central compartment B is selected.

[0045] Next, as shown in Figure 2(a) and Figures 4 to 6, a cleaning rod 9 is inserted into the selected compartments A and C, and the high-pressure water 12 sprayed from the cleaning rod 9 cuts the soil 13 in the selected compartments A and C, and the high-pressure water 12 also cuts the soil 13 in compartment B adjacent to the selected compartments A and C through the communication ports 7 and 8 (cleaning process), and the cut soil 13 is carried by the upward flow of the high-pressure water 12 and removed (soil removal process).

[0046] In this embodiment, the case where the end compartments A and C are selected is described as an example, and the cleaning rod 9 may be inserted into one of the two end compartments A and C to perform the cleaning and soil removal process, and then inserted into the other end compartment to perform the cleaning and soil removal process, or the cleaning rod 9 may be inserted into both end compartments A and C at the same time to perform the cleaning and soil removal process, as shown in Figure 2(a) and Figures 4 to 6. Also, in conjunction with the insertion of the cleaning rod 9 into the selected end compartments A and C, a small-diameter soil removal pipe may be inserted into the central compartment B, and soil 13 in compartment B may be removed at the same time.

[0047] As shown in FIG. 3, the cleaning rod 9 has a double pipe structure consisting of an air supply pipe 15 for supplying compressed air 14 and a high-pressure water supply pipe 16 for supplying high-pressure water 12 that is piped inside the air supply pipe 15. The compressed air 14 or high-pressure water 12 supplied to the air supply pipe 15 and the high-pressure water supply pipe 16, respectively, from externally installed supply means (not shown) is sprayed from a spray nozzle 17 at the tip.

[0048] The spray nozzle 17 is equipped with a high-pressure water spray port 17a at least at the lower end for spraying high-pressure water 12, and cuts the soil 13 in the selected compartment A, C with the sprayed high-pressure water 12, and pushes the cut soil 13 upwardly toward the upper opening of the selected compartment A, C by the high-pressure water 12 rising upward.

[0049] In addition, the injection nozzle 17 has a double-tube structure. Tube shaft circumferenceThe nozzle is rotatably attached to the nozzle body and has one or two injection holes 17b, 17b that open diagonally backward in the opposite direction to the direction of rotation, and is configured to rotate freely using a swivel mechanism by utilizing the force of the high-pressure water 12 sprayed out from the injection holes 17b, 17b.

[0050] Furthermore, the injection nozzle 17 is provided with air injection holes 17c, 17c connected to the air supply pipe 15, and compressed air 14 is injected from the air injection holes 17c, 17c to generate air bubbles in the water filling the joint steel pipes 4, 5, and the upward force of the air bubbles promotes the rise of the soil and sand 13.

[0051] In addition, although not specifically shown, the cleaning rod 9 may be provided with a cleaning brush on its outer circumferential surface so that the dirt 13 adhering to the inner surfaces of compartments A and C can be scraped off and removed by the cleaning brush.

[0052] The form of this cleaning brush is not particularly limited, and the bristles can be made of vegetable fibers (palm, coir, etc.), chemical fibers (nylon, polyethylene, polypropylene, etc.), metal wires (copper, brass, iron, stainless steel, etc.), etc.

[0053] The cleaning brush can also be made more effective by rotating the entire cleaning rod 9 .

[0054] Then, within the selected compartments A, C, the cleaning rod 9 is lowered while moving up and down as necessary to proceed with cutting and discharging the soil 13 within the selected compartments A, C. When it is lowered to the position where the communication ports 7, 8 are formed, as shown in Figure 5, the water pressure of the sprayed high-pressure water 12 acts through the communication ports 7, 8 on the compartment B adjacent to the selected compartments A, C, and the soil 13 in the adjacent compartment B is cut by the suction effect of the rising water current containing air bubbles, while the cut soil 13 is sucked out through the communication ports 7, 8 and discharged by the rising water current within the selected compartments A, C.

[0055] In this case, the communication ports 7, 8 are provided with a central reduced communication port 7 formed as a tapered hole with an opening narrowing toward the central compartment B, thereby promoting the inflow of high-pressure water 12 into the adjacent central compartment B through the central reduced communication port 7, and the communication ports 7, 8 are provided with an end reduced communication port 8 formed as a tapered hole with an opening narrowing toward the end compartments A, C, thereby promoting the suction of the cut soil 13 from the adjacent central compartment B.

[0056] Furthermore, when the central compartment B shown in Figure 2 (b) is selected, the communication ports 7, 8 are provided with a central reduced communication port 7 formed as a tapered hole with an opening narrowing on the central compartment B side, thereby facilitating the suction of cut soil 13 from the adjacent end compartments A, C, and the end reduced communication port 8 formed as a tapered hole with an opening narrowing on the end compartments A, C side is provided, thereby facilitating the inflow of high-pressure water 12 into the adjacent end compartments A, C through the end reduced communication port 8.

[0057] In addition, the soil 13 above the communication openings 7, 8 in the adjacent compartment B falls to the position of the communication openings 7, 8 due to its own weight, and is similarly cut through the communication openings 7, 8 and is sucked out and discharged.

[0058] In this case, by rotating the injection nozzle 17 around the pipe axis, even if the relative position between the cleaning rod 17 and the communication ports 7, 8 changes depending on the engagement state of the joint steel pipes 4, 5, the injected high-pressure water 12 can be reliably acted on the soil 13 in the adjacent compartment B directly through the communication ports 7, 8, and suction can be promoted by stirring caused by the rotation.

[0059] The supply amount and supply pressure of the high pressure water 12 and air are constant, taking into consideration the strength and geology of the ground where the steel pipe sheet piles 2, 2 are to be driven, but the supply amount and supply pressure can be changed as appropriate by observing the soil removal situation and the cleaning and soil removal situation of the selected compartments A and C and the adjacent compartment B. Also, the supply amount and supply pressure of the high pressure water 12 and air may be changed sequentially for each specified depth or time.

[0060] For example, the amount of high-pressure water 12 and air supplied when cleaning and discharging soil while moving between the communication ports 7, 8 in the pipe axial direction may be increased compared to the amount of high-pressure water 12 and air supplied when cleaning and discharging soil near the communication ports 7, 8.

[0061] The feed speed and number of up and down movements of the cleaning rod 9 may be appropriately changed when cleaning and discharging soil while moving between the communication ports 7, 8 in the axial direction of the pipe and when cleaning and discharging soil near the communication ports 7, 8.

[0062] 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 compartment A, C and soil removal by the high-pressure water 12 is sufficiently completed, at which point the cleaning rod 9 is raised.

[0063] Next, as shown in Figs. 7 to 9, a tremie is inserted into the selected compartments A and C after the cleaning and soil removal process. A filler supply pipe 10 such as a pipe is inserted into the lower end of the selected compartment A, C, and filler 11 such as mortar is poured into the selected compartment A, C while the filler supply pipe 10 is being pulled up.

[0064] As shown in Figures 8 and 9, when the upper end of the filler 11, such as mortar, poured into the selected compartment A or C reaches the position of the communication openings 7 or 8, it flows into the adjacent compartment B through the communication openings 7 or 8, and the filler 11 is also filled in the adjacent compartment B.

[0065] At this time, the lifting speed of the filler supply pipe 10 and the supply amount of filler 11 may be constant, but when the lower end of the filler supply pipe 10 is located near the communication ports 7, 8, the lifting speed may be reduced and the supply amount of filler 11 may be increased.

[0066] Then, while supplying the filler 11, the filler supply pipe 10 is successively raised, and the filler 11 is supplied until the filler 11 is filled up to the upper end of the selected compartments A and C, and until the filler 11 is filled up to the upper end of the adjacent compartment B.

[0067] In particular, in order to maximize the shear strength of the joint steel pipes 4, 5, it is important that the filler 11 is reliably filled into the central compartment B, so check that the filler 11 is filled up to the top end of the central compartment B.

[0068] Finally, the filler 11 such as mortar is cured and hardened, completing the joining of the adjacent steel pipe sheet piles 2, 2.

[0069] In the method of joining steel pipe sheet piles 2,2 configured in this manner, communication ports 7, 8 are provided in the joint steel pipes 4, 5, and after the joint steel pipes 4, 5 are engaged with each other, either the central chamber B or the end chambers A, C adjacent to the central chamber B is selected, a cleaning rod or the like is inserted into the selected chambers A, C, and the selected chambers A, C are cleaned, soil is removed, and filled with filler material 11. At the same time, the chamber B adjacent to the selected chambers A, C is cleaned, soil is removed, and filled with filler material 11 through the communication ports 7, 8. By doing so, even if the joint steel pipes 4, 5 are engaged in an offset state and it is difficult to insert a cleaning rod or the like into any of the chambers A, B, C, it is possible to reliably clean, remove soil, and fill each of the chambers A, B, C.

[0070] Furthermore, regardless of the engagement state of the two joint steel pipes 4, 5, work can be performed by inserting cleaning rods or the like only into the selected compartments A, C, thereby shortening the construction period.

[0071] Furthermore, in the present invention, since the filler 11 such as mortar is filled through the communicating ports 7, 8, the provision of the communicating ports 7, 8 reduces the adhesion area between the inner surface of the joint steel pipes 4, 5 and the filler 11 such as mortar, and therefore reduces the adhesion force. However, it is expected that the portion filled in the communicating ports 7, 8 will function as a slip stopper, compensating for the decrease in shear strength against shear slip.

[0072] In the above embodiment, the soil removal process is described as being carried out by using the high-pressure water 12 sprayed from the cleaning rod 9 and the rising force of air bubbles generated in the pressurized water to remove the soil to the outside. However, the soil removal process may also be carried out by inserting a soil removal pipe into the selected compartment A, B, C, or into the compartment adjacent to the compartment into which the cleaning rod 9 is inserted, and sucking up the soil 13 in each compartment cut by the cleaning rod 9 through the soil removal pipe. [Explanation of symbols]

[0073] 1 Steel pipe sheet pile diaphragm wall 2 Steel pipe sheet pile 3. Joints 4,5 Steel pipe for joints 6 Slit section 7 Center side reduction communication port 8 End side reduction communication port 9 Cleaning Rod 10 Filler supply pipe 11 Filling material 12 High Pressure Water 13. Soil 14. Air 15 Air supply pipe 16 High pressure water supply pipe 17 Injection nozzle 18 Cleaning Brush

Claims

1. The steel pipes for joints fixed to the outer parts of the adjacent steel pipe sheet piles are engaged with each other through vertical slits formed in the steel pipes for joints, and then three adjacent compartments formed by the engaged steel pipes for joints are cleaned and soil is removed from each of the compartments; Thereafter, a filler is filled into each of the compartments, and the steel pipe sheet piles are joined via the two joint steel pipes, a plurality of communication ports penetrating the 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; After the steel pipes for joints are engaged with each other, either the central compartment or the compartment at the end adjacent to the central compartment is selected, a cleaning process in which a cleaning rod is inserted into the selected compartment, high-pressure water is sprayed from the cleaning rod to cut soil in the selected compartment, and the high-pressure water is sprayed through the communication port to cut soil in a compartment adjacent to the selected compartment; After a soil discharging process of discharging the cut soil from the selected compartment and discharging soil from the compartment adjacent to the selected compartment through the communication port, A method for joining steel pipe sheet piles, comprising the steps of filling the selected compartment with a filler material, and filling the compartment adjacent to the selected compartment with a filler material through the communication port.

2. A method for joining steel pipe sheet piles as described in claim 1, wherein the communication ports are arranged alternately in the pipe axial direction, with central reduced communication ports formed in a tapered hole shape with an opening on the central compartment side narrowing, and end side reduced communication ports formed in a tapered hole shape with an opening on the end compartment side narrowing.

3. the cleaning rod has a double-pipe structure including an air supply pipe for supplying compressed air and a high-pressure water supply pipe arranged inside the air supply pipe for supplying high-pressure water; 3. The method for joining steel pipe sheet piles as described in claim 1 or 2, wherein the cleaning process and the soil removal process include spraying the high-pressure water from a spray nozzle connected to the high-pressure water supply pipe to cut the soil in the selected compartment and the compartment adjacent to the selected compartment, and, if necessary, spraying the compressed air from a spray nozzle, so that the cut soil is lifted together with the high-pressure water toward above the selected compartment and the compartment adjacent to the selected compartment by the upward force of air bubbles generated in the high-pressure water, and removed from the selected compartment.

4. 3. The method for joining steel pipe sheet piles according to claim 1, wherein the high-pressure water nozzle or the cleaning rod is rotated while the high-pressure water is jetted diagonally backward, opposite to the direction of rotation.

5. A method for joining steel pipe sheet piles as described in claim 1 or 2, wherein the soil discharge process includes inserting a soil discharge pipe into the selected compartment and / or a compartment adjacent to the selected compartment, and sucking up the cut soil through the soil discharge pipe.

6. 3. The method for joining steel pipe sheet piles according to claim 1 or 2, wherein the cleaning rod is provided with a cleaning brush on its outer circumferential surface.

7. The method for joining steel pipe sheet piles according to claim 5, further comprising the step of providing a cleaning brush on the outer circumferential surface of the soil removal pipe.

Images