JP4897985B2 - Hardener injection pipe for earth retaining work and earth retaining method - Google Patents

Description

The present invention relates to construction of earth retaining work in which a water pipe, a gas pipe, a gutter, a culvert box and the like are buried in the ground while earth retaining with a steel sheet pile or the like.

When constructing underground pipes such as water pipes, gas pipes, culvert boxes, sewer pipes, gutters, etc., first install earth retaining members such as simple sheet piles, iron plates, and sheet piles at the positions where both walls of the groove should be constructed. After preventing the wall from collapsing, the ground is excavated to form a groove, and a water pipe or the like is laid in the groove. After the laying operation is completed and the groove is refilled, the earth retaining member is pulled out from the ground. However, a void corresponding to the volume of the earth retaining member is generated in the ground. Until now, the problem of this void has been hardly studied. The surrounding earth and sand moves to fill this gap, and various problems can occur. For example, as time passes, sand or earth and sand filled in the groove move to fill the gap, and the pavement surface laid on the groove sinks, resulting in a depression on the road surface. Moreover, when the earth and sand outside the groove move, the ground condition on both sides of the groove changes, and nearby buildings can be affected. Furthermore, if the surrounding groundwater conditions change, a wide range of effects will also occur. Since the groundwater forms a waterway where it is most likely to pass, a new waterway is formed in a space where the water created by the removal of the earth retaining member and the water created by the earth and sand moved to fill it can be Groundwater flow fluctuates greatly. Due to the change in the state of the groundwater, the ground pressure balance of the surrounding ground that has been maintained until then is lost, and ground changes such as ground subsidence occur, which deforms the walls and buildings built there.

Therefore, in order not to generate a gap due to the sheet pile, it is conceivable that the sheet pile is not pulled out and remains in the ground after construction. However, the sheet pile left in the ground disappears due to oxidation / corrosion with time, and the above-mentioned problems still occur. Moreover, the metal which is the material of a sheet pile will contaminate soil, groundwater, etc. Disposing sheet piles is a wasteful use of resources.

Cited Document 1 (Japanese Patent Laid-Open No. 64-58713) describes that earth and sand are dropped to fill a gap when a steel sheet pile is pulled out. In Cited Document 2 (Japanese Patent Laid-Open No. 57-108311) and Cited Document 3 (Japanese Patent Laid-Open No. 57-108312), it is possible to fill a cavity with a “ground compaction agent”. ) Describes that a “filler” is injected. Furthermore, cited document 5 (Japanese Patent Laid-Open No. 2005-290963) describes injecting a curing agent.
JP-A 64-58713 JP-A-57-108311 JP-A-57-108312 JP 49-49404 JP-A-2005-290963

The method described in Patent Document 1 cannot be performed. When refilling the earth and sand into the ground, it is necessary to apply point pressure with a point pressure device about every 25 cm, and then apply water to consolidate. However, point pressure cannot be applied to the earth and sand put in the drawing sheet of the steel sheet pile. Moreover, if water is supplied into the ground during or immediately after the steel sheet piles are pulled out, ground subsidence is accelerated. Sediment that is not subjected to point pressure or squeezing has many voids and cannot prevent ground deformation.

Patent Document 2 and Patent Document 3 describe “ground compaction agent”, but these documents do not have any specific explanation about “ground compaction agent”. It is unknown. The “filler” of Patent Document 4 is not described in the same document, and it is unclear how it should be implemented.

Patent Document 5 specifically shows a soil retaining member, a curing agent injection tube, a work procedure, a type of a curing agent, and the like, and a technique that can be implemented is presented for the first time. However, the curing agent injection tube described in the document is cylindrical. The pipes described in Patent Documents 1 to 4 are all cylindrical.

However, it is difficult to attach the columnar earth hardening agent injection pipe to the fastening member. FIG. 13 is a perspective view showing the mounting operation of the cylindrical curing agent injection tube. There are few cases where the construction contractor owns a steel retaining member such as a steel sheet pile, and it is usually borrowed from a rental contractor at the time of construction and returned after the construction is completed. Therefore, the hardener injection pipe is attached to the earth retaining member at the construction site. Place the steel sheet pile on the ground, place the hardener injection tube on it and fix it. However, the cylindrical hardener injection tube is easy to roll. Steel sheet piles have a length of 20 m, and there is not always a place on the construction site where they can be held in a completely horizontal state. Therefore, the operator must hold the hardener injection tube by hand until the installation of the hardener injection tube is completed. Also, since the chuck of the machine that builds and pulls out is used to grab the central surface of the steel sheet pile, the hardener injection tube is preferably attached to the side of the steel sheet pile, but the side is inclined Therefore, it becomes more difficult to attach the columnar curing agent injection tube.

Moreover, if it is a long hardening | curing agent injection | pouring pipe | tube, it will divide | segment into a some rod and will attach after connecting each rod on a steel sheet pile. In the case of the screw-type connection method used in a normal curing agent injection tube, it is necessary to engage six or more threads. It is necessary to hold the rod with a tool such as a pyrene and rotate it. To do so, a space for rotating the pyrene is secured by placing a contact plate between the rod and the steel sheet pile. When all the rods are connected, the caulking plate is removed, and the hardener injection tube is pressed against the steel sheet pile and fixed by welding. During the entire period of this work, a plurality of workers must hold the hardener injection tube by hand so that the hardener injection tube does not roll.

An object of the present invention is to provide a simple and inexpensive earth retaining method in which the hardener injection pipe can be attached to the earth retaining member in a short time.

In order to solve the above-mentioned problem, the hardener injection pipe for earth retaining work of the present invention is a hardener injection pipe having a flow path for feeding the hardener and divided in a length direction into a plurality of portions, By connecting the divided curing agent injection pipes in the axial direction, the connecting members are connected so as to connect the flow paths. Further, the hardener injection tube is preferably provided with a planar retaining member mounting surface that abuts against the retaining member, and the outer shape is generally a polygonal column shape, particularly preferably a rectangular column shape.

The earth retaining method of the present invention is a curing agent injection pipe having a flow path for feeding a curing agent and divided in a length direction into a plurality of portions, and the divided curing agent injection pipes are inserted in the axial direction. It is a method of attaching a hardening agent injection pipe for earth retaining work having a connecting member to connect each flow path so as to connect each flow path and installing it in the earth retaining member to perform earth retaining and divided. The hardener injection pipes are inserted in the axial direction to connect the flow paths to each other, and the hardener injection pipe for earthing work is attached to the earth retaining member. When the earth retaining member is pulled out, the curing agent is used as the hardener. It pulls out while injecting into the ground through the flow path of the injection pipe, and fills the voids of the pull-out trace of the earth retaining member with a curing agent. In addition to this, the hardener injection pipe for earth retaining work has a flat earth retaining member attaching surface that abuts against the earth retaining member, and the earth retaining member is brought into contact with the earth retaining member. It is preferable that the construction hardener injection pipe is attached to the earth retaining member. Furthermore, it is preferable that the earth retaining member is a steel sheet pile having a central surface and side surfaces connected to both ends of the central surface, and a hardener injection pipe for earth retaining work is attached to the side surface. In addition, the earth retaining member is divided into a plurality of partial members in the length direction, and after mounting the dividing rod on the partial member, it is built into the ground, and the next partial member is placed on the upper part of the partial member that was built immediately before Are connected by welding, and the next split rod is inserted in the axial direction into the split rod of the partial member that was built immediately before, and then attached to the next partial member to be further built into the ground. May be.

The present invention has an effect that the hardener injection tube can be attached to the earth retaining member in a short time. It has the effect that it can be implemented even in places where the ground is inclined or narrow.

The best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a front view showing an outline of a hardener injection pipe for earth retaining work. The hardener injection pipe 1 for earth retaining work is divided in the length direction. In this example, it is divided into one tip member 2, followed by three intermediate rods 3, and a swivel 4 located at the uppermost stage. And the connection member 5 is provided in the meantime.

FIG. 2 is a cross-sectional view showing a tip member of a hardener injection pipe for earth retaining work. The tip member 2 and the intermediate rod 3 have a planar retaining member attachment surface 6 that abuts against the retaining member. The other surface can be formed on a curved surface, but the outer shape is preferably a polygonal column. In this example, it has a quadrangular prism shape.

The tip member 2 and the intermediate rod 3 have a plurality of independent flow paths inside. In this example, the double pipe structure is provided with two flow paths 7 and 8 so that two kinds of chemical solutions can be sent independently, but a triple pipe or more may be used. The tip member 2 has a discharge port 9 on its side surface, and can discharge the curing agent in the lateral direction. In this example, one discharge port 9 having a diameter of 8 to 10 mm is provided on each surface except the flat earth retaining member mounting surface 6.

A stopper 10 and a biasing member 11 that biases the stopper 10 upward are provided near the discharge port 9. The stopper 10 is made of high-hardness plastic. The biasing means 11 is also made of plastic so that it does not deteriorate even in the soil for a long period of time, and is lowered with a weight of about 0.5 kg. In a state where atmospheric pressure is applied to the upper surface of the stopper 10, the stopper 10 is in a position for closing the discharge port 9 (FIG. 2a).

FIG. 3 is a cross-sectional view showing the intermediate rod 3 of the hardener injection pipe for earth retaining work. Like the tip member 2, it has a quadrangular prism shape and has a flat earth retaining member attachment surface 6 that abuts against the earth retaining member. Further, the inside has a double tube structure and has two independent flow paths 7 and 8. The intermediate rod 3 and the swivel 4 have a planar retaining member attachment surface 6 that abuts against the retaining member. The other surface can be formed on a curved surface, but the outer shape is preferably a polygonal column. In this example, it has a quadrangular prism shape.

FIG. 4 is a cross-sectional view showing the hardener introduction part 4 of the hardener injection pipe for earth retaining work. The curing agent introducing section 5 is not of a swivel type and is not rotated with respect to the intermediate rod 3. Two curing agent inlets 12 and 13 are provided so that a hose can be attached.

Connection member insertion ports 14 are formed at the upper end portion of the tip member 2, both end portions of the intermediate rod 3, and the lower end portion of the hardener introduction portion 4. The connection member insertion port 14 includes a first circular hole 15 having a large diameter and a second circular hole 16 having a small diameter at the back thereof. An O-ring 17 is provided on the inner peripheral surface of the first circular hole 15.

FIG. 5 is a cross-sectional view showing the connection member 5. The connecting member 5 includes a thick columnar base 18 and a thin columnar projection 19 projecting from both sides of the base 18. The outer diameter of the base 18 is substantially the same as the inner diameter of the first circular hole 15 of the connection member insertion port 14, and the outer diameter of the protrusion 19 is substantially the same as the inner diameter of the second circular hole 16 of the connection member insertion port 14. It is. Further, the length of the projection 19 is substantially the same as the depth of the second circular hole 16. Therefore, one side of the connection member 5 and the connection member insertion port 14 can be fitted by inserting the connection member 5 into the connection member insertion port 14 in the axial direction.

In the center of the connecting member 5, a first hole 20 that passes through the base 18 and the protrusion 19 penetrates. Further, a plurality of second holes 21 are also passed near the outer side of the base 18. An O-ring 22 is provided on the outer periphery of the protrusion 19.

Next, the earth retaining method using the curing agent injection pipe 1 for earth retaining work will be described. FIG. 6 is a perspective view showing the work of attaching the hardener injection pipe for earth retaining work. A steel sheet pile 30 is used as the earth retaining member. Although the steel sheet pile 30 has the wide center surface 31 and the side surfaces 32 of the both sides of the center surface 31, the case where the hardening agent injection pipe | tube 1 for earth retaining work is attached to the center surface 31 is demonstrated here.

The steel sheet pile 30 is placed on the ground of the construction site. The ground need not be completely horizontal and may have some irregularities and slopes. The tip member 2 and the intermediate rod 3 are connected on the central surface 31. The connection work may be performed from the tip member 2 or from the uppermost intermediate rod 3. For example, first, the tip member 2 is placed at the tip of the steel sheet pile 30, and one side of the connection member 5 is inserted into the connection member insertion port 14 at the upper end of the tip member 2. Next, the opposite side of the connection member 5 and the connection member insertion port 14 of the intermediate rod 3 are engaged. In this way, it is possible to simply connect by inserting in the length direction without rotating the tip member 2 and the intermediate rod 3. The second and subsequent intermediate rods 3 are similarly connected. Connect to the uppermost intermediate rod 3. However, since the chuck of the machine holds the upper end portion of the central surface 31 when the steel sheet pile is installed, when the hardener injection tube 1 is attached to the central surface 31, the rod 3 is attached to the steel sheet pile 30. It can be attached only to the lower side from the upper end.

After the connection up to the uppermost intermediate rod 3, the fixing brackets 23 are attached to both sides of each connection portion and welding is performed. FIG. 7 is a cross-sectional view showing a connection location. The fixing bracket 23 is a bracket having an L-shaped cross section, and has two surfaces perpendicular to each other. One surface is in contact with the steel sheet pile 30 and the other surface is in contact with the side surface of the work hardener injection pipe 1, thereby fixing the steel sheet pile 30 and the work hardener injection pipe 1 in a stable state. The work hardener injection pipe 1 is attached to the steel sheet pile 30 by welding the fixing bracket 23 to the steel sheet pile 30 and the work hardener injection pipe 1.

As described above, the tip member 2 and the intermediate rod 3 are simply connected by the connecting member. The first hole 21 of the connecting member 5 communicates with the flow paths 7 in the central portion, and the second hole 22 communicates with the flow paths 8 in the outer peripheral portion. Therefore, by this connection, two continuous flow paths are formed from the tip member 2 to the uppermost intermediate rod 3. Since the tip member 2 and the intermediate rod 3 are in contact with the steel sheet pile 30 by the flat retaining member attachment surface 6, the tip member 2 and the intermediate rod 3 do not roll during the attachment work and do not need to be pressed by the operator. In addition, since there is a sufficiently wide contact surface, it is stable during the connection work, and the connection can be made straight along the length direction of the steel sheet pile 30.

When the attachment of the hardener injection pipe 1 to the steel sheet pile 30 is completed, the steel sheet pile 30 is built on both sides of the place where the burial work is performed. The erection operation can be performed using, for example, a normal device that press-fits a steel sheet pile into the ground.

Here, arrangement | positioning of a steel sheet pile is demonstrated. It is not always necessary to attach a hardener injection pipe to all steel sheet piles installed as earth retaining, and a steel sheet pile with a hardener injection pipe and a normal steel sheet pile without a hardener injection pipe may be used in combination. . For example, two or three steel sheet piles without a hardener injection pipe are installed following a steel sheet pile with a hardener injection pipe attached, and a steel sheet pile with a hardener injection pipe attached. You may arrange by repeating. A steel sheet pile to which the curing agent injection tube is attached can be installed as long as the curing agent injected from the curing agent injection tube 1 is within a distance range.

When the steel sheet pile 30 is installed, the urging member 11 in the tip member 2 pushes the stopper 10 upward, and the outlet 9 is closed by the stopper 10. Therefore, earth and sand do not enter the hardener injection tube 1.

Next, a method for removing the steel sheet pile 30 will be described. The hardener introduction part 4 is attached to the upper end of the hardener injection pipe 1 of the steel sheet pile 30 to be pulled out. A hardener hose is connected to the hardener inlets 12 and 13 of the hardener inlet 4. The steel sheet pile 30 is sequentially pulled out from the end, and is performed while injecting the curing agent into the ground by the curing agent injection tube 1.

In order to quickly fill the traces of the steel sheet pile 30, the hardener is preferably a gel having a short gel time in which two liquids are mixed.
An example of the instantaneous curing agent will be described. A liquid A is prepared by adding 80 liters of water to 80 liters of water glass (JIS No. 3 sodium silicate). As B liquid, the thing which added the hardening | curing agent for inorganic suspension water glass grout to blast furnace cement B type is prepared. For example, 50 kg of blast furnace cement type B, 10 kg of YMS45 (Sanko Colloid Chemical Co., Ltd.) and 178.7 liters are mixed to make a B liquid. YMS45 is a drug mainly composed of calcium sulfate and calcium hydroxide. By using this A liquid and B liquid on a one-to-one basis, and mixing B blast furnace cement type B 50 kg, YMS90 (Sanko Colloid Chemical Co., Ltd.) 5 kg and 181.4 liters into B liquid, The gel time at 1 to 2 minutes and 4 weeks strength 0.5 to 1 N / mm ² . These hardeners are highly safe and non-polluting drugs that do not contain poisonous or deleterious substances.
Next, an example of a slow-curing curing agent will be described. Blast furnace cement type B 50 kg, bentonite 10 kg, cement milk setting hardening accelerator YMS2000 (Sanko Colloid Chemical Co., Ltd.) 4 kg and 177.8 liters are mixed. Thus, the fluidity disappearance time is 30 to 40 minutes, and the 4-week strength is 0.71 N / mm ² .

When the curing agent is injected from the hose into the curing agent injection tube 1, the stopper 10 is pushed downward by the pressure of the curing agent, and the discharge port 9 is opened. In this example, a small air vent hole 25 is provided on the side wall below the position of the stopper 10. Therefore, the stopper 10 moves smoothly downward, and the discharge port 9 provided laterally on the side wall of the tip member 2 is reliably opened. Two types of chemical solutions (A solution and B solution) that have passed through the two flow paths 7 and 8 are mixed in the tip member 2 and injected laterally from the discharge port 9 into the ground.

The hardener injected into the ground from the hardener injection tube 1 fills the gap formed by the steel sheet pile previously drawn out and the steel sheet pile with the hardener injection tube itself. Therefore, there is no change in the ground condition due to the movement of soil in the ground and the change of the groundwater channel due to the gap.

When the drawing is completed, the curing agent introducing portion 4 and the hose are removed and then attached to the steel sheet pile to be drawn out. Thereafter, the same operation is repeated to remove all the steel sheet piles. The hardener injection pipe 1 for construction may be attached to all the steel sheet piles, and the steel sheet pile with the construction hardener injection pipe and the steel sheet pile without the construction hardener injection pipe are combined. You may use it alternately.

Next, an example in which the hardener injection tube 1 is attached to the side surface 32 of the steel sheet pile 30 will be described. FIG. 8 is a perspective view showing the attaching operation to the side surface of the hardener injection tube. First, on the side surface 32 of the steel sheet pile 30 placed on the ground, the fixing bracket 23 is welded to the lower side of the position where the connecting member 5 of the hardener injection tube 1 is attached. When the fixtures 23 are attached in a row, the curing agent injection tube 1 is assembled on the fixtures 23. First, the tip member 2 and the intermediate rod 3 are connected by the connecting member 5. Connection can be easily performed by inserting in the length direction. Thereafter, the intermediate rod 3 is connected in the same procedure. After the connection to the uppermost intermediate rod 3, the connection location of the hardener injection tube 1 and the fixing bracket 23 are fixed by welding. Further, the fixing bracket 23 is attached to the upper side of the connection portion and welded. In this way, the hardener injection tube 1 is attached to the side surface 32 of the steel sheet pile 30.

Since the side surface 32 of the steel sheet pile 30 is inclined, it is extremely difficult to mount it with a cylindrical hardener injection tube. In addition, a screw-type connection method cannot be used because a patch plate for using the pyrene cannot be placed. In this example, since the square columnar curing agent injection tube 1 is used, the operation is easy and can be firmly fixed.

When the steel sheet pile is installed, the chuck of the machine holds the upper end portion of the central surface 31. Therefore, when the hardener injection tube 1 is attached to the central surface 31, the intermediate rod 3 is only slightly below the upper end of the steel sheet pile. It cannot be installed. Therefore, when the steel sheet pile 30 is built such that the upper end of the intermediate rod 3 comes out on the ground, the upper end portion protrudes to the ground to some extent. However, since the side surface 32 is not used for the chuck of the machine, the intermediate rod 3 can be attached to the upper end of the steel sheet pile 30 or even in a state where it protrudes to some extent. Almost all of the steel sheet pile 30 can be inserted into the ground.

Next, a method for injecting the curing agent at a plurality of different depths will be described. FIG. 9 is a perspective view showing a method of injecting a curing agent at a plurality of different depths. Here, two long hardener injection pipes 1a and a short hardener injection pipe 1b are attached. The long hardening | curing agent injection | pouring pipe | tube 1a is extended to the lower end of the steel sheet pile 30 similarly to what was demonstrated by the example so far, and the discharge outlet 9a is located in the lower end part. On the other hand, the short hardening | curing agent injection | pouring pipe | tube 1b has about half the number of intermediate rods 3 of the long hardening | curing agent injection | pouring pipe | tube 1a, and is about half the length of a steel sheet pile. The discharge port 9b is at a position about half the length of the steel sheet pile.

Thereby, the flow path leading to the discharge port 9a and the flow path leading to the discharge port 9b are independent of each other. When this steel sheet pile is pulled out, the hardener introduction part 4 and the hose are connected to the upper parts of the long hardener injection pipe 1a and the short hardener injection pipe 1b, respectively. Then, the steel sheet pile is pulled out while simultaneously injecting the curing agent from both the discharge port 9a and the discharge port 9b. Thereby, the injection time of the curing agent can be shortened to about ½.

As described above, the example in which the discharge ports 9 are provided at two depths has been described. In this case, a curing agent injection tube provided with three channels is used. When the length of the steel sheet pile is L, the discharge ports 9 are provided at the lowest end of the steel sheet pile, at the position L / 3 from the lowest end, and at the position 2 · L / 3 from the lowest end. This can reduce the injection time to about 1/3.

In order to inject the curing agent at a plurality of different depths, a multistage curing agent injection tube provided with discharge ports 9 at two or more depths may be used. 10 and 11 are cross-sectional views showing an example of a multistage curing agent injection tube. In the example of FIG. 10a, the prisms have the same thickness over the length direction. Two independent curing agent channels 7a and 7b are provided inside. The central channel 7a extends to the tip and is connected to a discharge port 9a provided at the tip. The outer peripheral flow path 7b is connected to the discharge port 9b at a position of about L / 2 from the tip (L is the length of the steel sheet pile). In the example of FIG. 10b, three flow paths are provided in the same hardener injection pipe, and each of them is a discharge port 9a at the lowermost end of the steel sheet pile, a position L / 3 from the lowermost end (2L / second from the uppermost end). 3) and the discharge port 9c at a position 2L / 3 from the lowermost end (position at L / 3 from the uppermost end). In addition, although illustration is abbreviate | omitted, like the hardening | curing agent injection | pouring pipe | tube shown in FIG. 1, it is divided | segmented into the length direction at several parts, and inserts the divided | segmented hardening | curing agent injection | pouring pipes in an axial direction. The connection member which connects so that each flow path may be connected by. Moreover, it is the same as that which attaches a fixing metal fitting to a connection location and attaches a hardening | curing agent injection pipe | tube to a steel sheet pile. Since one flow path 7 is connected to each discharge port 9, one liquid curing agent such as cement milk is used. For example, a hardener to which YMS2000, which is a cement milk setting hardening accelerator, is added can be used.

In the example of FIG. 11 as well, the inside is provided with three independent curing agent channels 7a, 7b and 7c, each of which has a discharge port 9a at the lowest end, and a position L / 3 from the lowest end (the highest end). To a discharge port 9b at a position 2L / 3 from the bottom and a discharge port 9c at a position 2L / 3 from the bottom (position L / 3 from the top). The outer shape of the hardening agent injection tube is thicker at the upper third portion, slightly thinner at the intermediate portion following the outer portion, and thinnest at the lower third portion.

Furthermore, the method of dividing | segmenting and installing a steel sheet pile is demonstrated. FIG. 12 is a schematic view showing a method of dividing and installing a steel sheet pile. Depending on the construction site, there may be an obstacle 24 such as a bridge in the upper part, and a long steel sheet pile may not be driven as it is. Therefore, the steel sheet pile is divided into short pieces that can be built even in a limited space under the obstacle 24. First, the tip member 2 and the intermediate rod 3 are attached to the first piece of steel sheet pile, and this piece is built.

Next, the next piece is placed on the previously built piece and connected by welding. Further, a new intermediate rod 3 is inserted and connected to the upper end of the intermediate rod 3 attached to the previous piece in the axial direction. Then, the new intermediate rod 3 is attached to the steel sheet pile piece by welding with the fixing bracket 23. At this time, although the steel sheet pile is standing vertically, the intermediate rod 3 can be easily connected by insertion through the connecting member 5. Moreover, since the intermediate rod 3 has a quadrangular prism shape, it is easy to press and position the steel rod against the steel sheet pile, and there is no difficulty in mounting. When the intermediate rod 3 is attached, this new steel sheet pile is also inserted into the ground. The same work is repeated until the steel sheet pile is built to the required depth.

The steel sheet pile is pulled out while injecting the hardener into the ground from the hardener injection tube 1. When one piece of steel sheet pile comes out on the ground, the hardener injection and withdrawal are interrupted. While disconnecting the welding location between fragments, the connection location between the intermediate rods 3 is also disconnected. The curing agent introduction part 4 and the hose are attached to the remaining intermediate rod 3, and the curing agent is injected and pulled out again. In this way, all the steel sheet piles are removed while repeating drawing and cutting for each piece.

As described above, the earth retaining work can be performed with a simple device and work. Since there are no gaps left by pulling out the steel sheet piles, it is prevented that the lot number fluctuates. Since no water is used for installation, the construction site is not flooded. Since a boring machine or the like is not required for installing the hardener injection pipe, a rental fee for using these facilities is also unnecessary. Since the generator is small, energy consumption is small and exhaust gas is reduced. Since the collected steel sheet pile is reused, there is no wasteful consumption of resources.

A first embodiment of the present invention will be described. FIG. 14 is a conceptual diagram showing a hardener injection tube of this embodiment. The intermediate rods 3a and 3b are two cylindrical pipes provided in parallel. Each pipe 3a, 3b forms an independent hardener flow path. The intermediate rods 3a and 3b are divided in the length direction. And it connects by the connection member connected by inserting in a length direction. This connection member is substantially the same as that shown in FIG. 5, but one for each of the pipes 3a and 3b at each connection location, and only one flow path .

And the anti-blur member 5a is attached to a connection location. The anti-blur member 5a has a substantially rectangular parallelepiped outer shape, and two holes 5b for receiving the pipes 3a and 3b pass therethrough. The mutual positional relationship between the pipes 3a and 3b is fixed by the anti-blur member 5a, thereby preventing the pipes 3a and 3b from blurring when a steel sheet pile is installed.

The tip member 2 has a substantially rectangular parallelepiped outer shape, and in particular, the surface of the most distal portion is formed in an obliquely cut shape so that the tip member 2 can easily travel through the soil when built. In the tip member 2, the two flow paths merge to mix the liquid that has passed through the pipes 3a and 3b. There are three outlets in the lateral direction on the side.

FIG. 15 is a perspective view showing an attaching operation of the hardener injection pipe to the center surface in the first embodiment, and FIG. 16 is a conceptual view showing a welding method of the hardener injection pipe. First, the tip member 2 and the intermediate rods 3a and 3b are connected in one-touch by inserting them in the length direction via the connecting member. Then, the anti-blur member 5a is attached to the other end of the intermediate rods 3a and 3b. The anti-blur member 5a can also be attached by passing the pipes 3a and 3b through the hole 5b. Then, the tip member 2 and the anti-blur member 5 a are welded to the steel sheet pile 30. Since the tip member 2 and the anti-blur member 5a are substantially rectangular parallelepiped and have a planar earth retaining member attachment surface, they can be easily and reliably attached.

Next, the next intermediate rods 3a and 3b are connected. Further, the anti-blur member 5a is attached to the upper part of the added intermediate rod 3. The intermediate rods 3 can also be connected to each other by one touch by inserting them in the length direction via a connecting member. Since it is not a screw type, it is not necessary to rotate the intermediate rods 3, and thus it is possible to sequentially connect from the tip portion in this way. No special tools such as a wrench are required.

FIG. 17 is a perspective view showing an operation of attaching the curing agent injection pipe to the side surface in the first embodiment. First, the tip member 2 and the intermediate rods 3a and 3b are connected in one-touch by inserting them in the length direction via the connecting member. Then, the anti-blur member 5a is attached to the other end of the intermediate rods 3a and 3b. The tip member 2 and the anti-blur member 5 a are welded to the side surface 32 of the steel sheet pile 30. Further, the next intermediate rod 3 is welded in succession while being attached to the side face 32 of the steel sheet pile 30. Although the side surface 32 of the steel sheet pile 30 is inclined, the connection between the intermediate rods 3 can also be performed with one touch by inserting it in the length direction via the connecting member. Since it is not a screw type, it is not necessary to rotate the intermediate rods 3, and thus it is possible to sequentially connect from the tip portion in this way. When attached to the side surface 32 of the steel sheet pile 30 as shown in FIG. 17, the intermediate rod 3 can be attached up to the top of the steel sheet pile 30 because it does not interfere with the chuck portion of the machine at the time of installation. Therefore, almost all of the steel sheet pile 30 can be driven into the ground, and there is almost no portion protruding to the ground.

When the hardener injection pipe 1 is attached to the steel sheet pile 30, it is built into the ground. When the burying work is completed, the steel sheet pile 30 is pulled out. The steel sheet pile 30 that attaches the hardener introduction part 4 to the uppermost part of the intermediate rods 3a and 3b and connects the hardener hose to the hardener inlets 12 and 13 is sequentially pulled out from the end. Perform while injecting curing agent. In this embodiment, since two independent pipes 3a and 3b have independent flow paths, a two-component curing agent can be used. For example, 80 parts of water glass (JIS No. 3 sodium silicate) added to 120 liters of water is prepared as liquid A, and as liquid B, blast furnace cement type B 50 kg, YMS45 (Sanko Colloid Chemical Co., Ltd.) 10 kg and Prepare a mixture of 178.7 liters. This A liquid and B liquid are inject | poured 1: 1. Alternatively, 50 kg of Blast Furnace Cement B, 5 kg of YMS90 (Sanko Colloid Chemical Co., Ltd.) and 181.4 liters may be mixed to obtain B liquid. These hardeners are highly safe and non-polluting drugs that do not contain poisonous or deleterious substances.

A second embodiment of the present invention will be described. FIG. 18 is a conceptual diagram showing a curing agent injection tube of this embodiment. The intermediate rod 3 has a cylindrical outer shape. The inside has a double pipe structure, and two independent flow paths 7 and 8 are provided.

The tip member 2 has a substantially rectangular parallelepiped outer shape, and in particular, the surface of the most distal portion is formed in an obliquely cut shape so that the tip member 2 can easily travel through the soil when built. In the tip member 2, the two flow paths merge so that the two independent flow paths 7 and 8 of the intermediate rod 3 are mixed. There are three outlets in the lateral direction on the side.

The connection between the tip member 2 and the intermediate rod 3 and the connection between the intermediate rods 3 are performed via a connection member 4 shown in FIG. Therefore, it is not necessary to rotate the intermediate rod 3, and it can be connected with one touch by inserting in the length direction.

A hardener injection tube can be attached to both the central surface 31 and the side surface of the steel sheet pile 30. The connection between the tip member 2 and the intermediate rod 3 and the connection between the intermediate rods 3 are performed via a connection member 4 shown in FIG. First, the tip member 2 and the intermediate rod 3 are connected in one-touch by inserting them in the length direction via a connecting member. Then, the tip member 2 is welded to the steel sheet pile 30.

Next, the next intermediate rod 3 is connected. And a connection location is welded via fixing brackets 23, such as an L-shaped angle, and the intermediate rod 3 is fixed to the steel sheet pile 30. FIG. The intermediate rod 3 is attached to the steel sheet pile 30 while adding the intermediate rod 3 to the upper end of the steel sheet pile 30 in the same procedure. The intermediate rods 3 can also be connected to each other by one touch by inserting them in the length direction via a connecting member. Since it is not a screw type, it is not necessary to rotate the intermediate rods 3, and thus it is possible to sequentially connect from the tip portion in this way. No special tools such as a wrench are required.

Thus, the steel sheet pile to which the hardener injection pipe is attached is built in the ground as in the first embodiment. At the time of drawing, the curing agent introduction part 4 is attached to the uppermost intermediate rod 3. The hardening | curing agent introducing | transducing part 4 of this Example is attached to the chuck | zipper part of the machine called a pillar used for extraction of the steel sheet pile 30. FIG. Then, the steel sheet pile is pulled out while injecting the curing agent into the ground by the curing agent injection tube 1. Since this curing agent injection tube 1 has two independent flow paths 7 and 8, a two-component curing agent can be used, and the curing agent of the example described in the first embodiment should be used. Can do.

A third embodiment of the present invention will be described. FIG. 19 is a conceptual diagram showing this embodiment, and FIG. 20 is a conceptual diagram showing a steel sheet pile installation method in this embodiment. In this embodiment, in addition to the hardener injection tube 1, the high-pressure water injection tube 40 is also attached to the earth retaining member for earth retaining. When the steel sheet pile is difficult to enter, the steel sheet pile can be built quickly by ejecting about 200 kg / cm 2 of high-pressure water directly from the high-pressure water injection pipe 40.

When the steel sheet pile 30 is pulled out, the hardener is injected into the ground by the hardener injection tube 1 to fill the voids in the extraction trace. The hardening | curing agent inject | poured here is a thing of 1 liquid. For example, it is possible to use a mixture of 50 kg of blast furnace cement B, 10 kg of bentonite, 4 kg of cement milk setting accelerator, 4 kg of Sanko Colloid Chemical Co., Ltd., and 177.8 liters. This is a curing agent having a fluidity disappearance time of about 30 to 40 minutes.

In the case of this embodiment, the hardener injection pipe 1 and the high-pressure water injection pipe 40 are attached to all the steel sheet piles 30. The steel sheet pile 30 can be built using the vibro-hammer method, which is built while applying forced vibration with a vibration pile driver, and the steel sheet pile 30 is grounded by the reaction force while the machine holds the already built steel sheet pile. There is a so-called Silent Piler method that press fits inside.

FIG. 21 is a plan view showing attachment positions of the curing agent injection pipe 1 and the high-pressure water injection pipe 40 in the vibro hammer method, and FIG. 22 is a perspective view thereof. The hardener injection tube 1 and the high-pressure water injection tube 40 are attached to the inner and outer central portions (location 1 and location 2 in FIG. 21) of the central surface of the steel sheet pile 30. At the time of installation, high-pressure water is ejected through the high-pressure water injection pipe 40. In particular, when the steel sheet pile is difficult to enter, the hardener injection tube 1 and the high-pressure water injection tube 40 may be attached to the left and right side surfaces (location 3 and location 4 in FIG. 21) in addition to the location 1 and location 2. At the time of drawing, a hardening agent is injected for each steel sheet pile 30.

FIG. 23 is a plan view showing attachment positions of the curing agent injection pipe 1 and the high-pressure water injection pipe 40 in the silent pillar method, and FIG. 24 is a perspective view thereof. The hardener injection pipe 1 and the high-pressure water injection pipe 40 are attached to the central portion (place 1 in FIG. 23) of the surface facing the inside on the central surface of the steel sheet pile 30. At the time of installation, high-pressure water is ejected through the high-pressure water injection pipe 40. In particular, when the steel sheet pile is difficult to enter, the hardener injection tube 1 and the high-pressure water injection tube 40 may be attached to the left and right side surfaces (location 3 and location 4 in FIG. 21) in addition to the location 1. At the time of drawing, a hardening agent is injected for each steel sheet pile 30.

The sheet pile according to the present invention can be widely used for constructions that are carried out with earth retaining members such as sheet piles, such as construction for embedding water pipes and gas pipes in the ground. Since there are no gaps left in the traces of the earth retaining members, there will be no changes in the ground conditions due to the movement of soil in the ground due to the gaps and changes in the groundwater channels, which has a safe and environmental impact. Less earth retaining work can be realized.

It is a front view which shows the outline of the hardening | curing agent injection pipe | tube for earth retaining work. It is sectional drawing which shows a front-end | tip member. It is sectional drawing which shows an intermediate | middle rod. It is sectional drawing which shows a hardening | curing agent introduction part. It is sectional drawing which shows a connection member. It is a perspective view which shows the attachment operation | work of the hardening | curing agent injection pipe | tube to a center surface. It is sectional drawing which shows a connection location. It is a perspective view which shows the attachment operation | work of the hardening | curing agent injection pipe | tube to a side surface. It is a perspective view which shows the method of inject | pouring a hardening | curing agent in several different depth. It is sectional drawing which shows the example of a multistage type hardener injection tube. It is sectional drawing which shows another example of a multistage hardener injection tube. It is the schematic which shows the method of dividing | segmenting and installing a steel sheet pile. It is a perspective view which shows the attachment operation | work of a column-shaped hardening | curing agent injection pipe. It is a conceptual diagram which shows the hardening | curing agent injection pipe | tube of a 1st Example. It is a perspective view which shows the attachment operation | work of the hardening | curing agent injection pipe to the center surface in a 1st Example. It is a conceptual diagram which shows the welding method of a hardening | curing agent injection pipe. It is a perspective view which shows the attachment operation | work of the hardening | curing agent injection | pouring pipe | tube to the side surface in a 1st Example. It is a conceptual diagram which shows the hardening | curing agent injection pipe | tube of a 2nd Example. It is a conceptual diagram which shows a 3rd Example. It is a conceptual diagram which shows the construction method of the steel sheet pile in a 3rd Example. It is a top view which shows the attachment position of the hardening | curing agent injection pipe in a vibro hammer construction method, and a high pressure water injection pipe. It is the same perspective view. It is a top view which shows the attachment position of the hardening | curing agent injection pipe and high-pressure water injection pipe in a silent pillar construction method. It is the same perspective view.

Explanation of symbols

1. Hardener injection pipe for earth retaining work2. 2. Tip member Intermediate rod 4. 4. Curing agent introduction part Connecting member 6. Earth retaining member mounting surface 7, 8 Channel 9. Discharge port 10. Stopper 11. Biasing means 23. Fixing bracket 30. Steel sheet pile 31. Central surface 32. side

Claims (8)

It is a curing agent injection pipe having a flow path for feeding a curing agent and divided in a length direction into a plurality of portions, and each flow path is inserted by inserting the divided curing agent injection pipes in the axial direction. A hardening agent injection pipe for earth retaining work , comprising a connecting member connected so as to be connected, and a planar earth retaining member mounting surface abutting against the earth retaining member . The intermediate rod is divided into a plurality of intermediate rods, and the intermediate rod has two cylindrical pipes provided in parallel, and the positional relationship between the two cylindrical pipes is fixed by the anti-blur member, and the The hardener injection pipe for earth retaining work according to claim 1, wherein the retaining member is provided with a planar earth retaining member mounting surface. Retaining construction curing agent injection tube according to claim 1 is the outer shape is generally polygonal shape. The hardener injection pipe for earth retaining work according to claim 3 , wherein the outer shape is substantially a quadrangular prism shape. It has a flow path for feeding the curing agent, is divided into a plurality of portions in the length direction, has a flat earth retaining member mounting surface that comes into contact with the earth retaining member, and the divided curing agent injection pipes are connected to each other. By attaching the hardening agent injection pipe for earth retaining work having a connecting member to connect each flow path by inserting in the axial direction, it is attached to the earth retaining member by welding on the earth retaining member attaching surface. It is a construction method that builds in and holds earth retaining,
Attaching the hardener injection pipe for earthing work to the earth retaining member by connecting the flow paths to each other by inserting the divided hardener injection pipes in the axial direction,
A soil retaining method in which when the earth retaining member is pulled out, the curing agent is extracted while being injected into the ground through the flow path of the curing agent injecting pipe, and the void of the withdrawal trace of the earth retaining member is filled with the curing agent. 6. The earth retaining method according to claim 5, wherein the earth retaining work hardener injection pipe is attached to the earth retaining member at a construction site . The earth retaining method according to claim 5 or 6, wherein the earth retaining member is a steel sheet pile having a central surface and side surfaces connected to both ends of the central surface, and a hardener injection pipe for earth retaining work is attached to the side surface. The earth retaining member is divided into a plurality of partial members in the length direction, and after installing the divided hardener injection pipe into the partial members, it is built in the ground, and next to the upper part of the partial member that was built immediately before After connecting the partial member of this part by welding and inserting the next divided hardener injection pipe into the hardener injection pipe of the partial member built immediately before and connecting it to the next partial member The earth retaining method according to any one of claims 5 to 7, wherein the earth retaining method is further built into the ground.

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