JP5339466B2 - Pipe roof construction method - Google Patents

Description

  The present invention relates to a pipe roof construction method for constructing a collapsing protection wall with a plurality of steel pipes continuously provided in the ground.

  When building underground spaces and tunnels directly below existing underground structures and infrastructure pipelines in urban areas, a space with uniform defined dimensions should be constructed depending on the arrangement of underground structures and existing buried objects. In many cases, the construction technique for constructing a space directly under such an obstacle is limited. Among them, the pipe roof construction method is generally used as a construction method for constructing a complicated rectangular section space, a large section and a horseshoe section in the basement.

  This construction method is also used to prevent loose ground and settling of vulnerable ground even in the NATM method of excavating fragile unconsolidated mountains in the mountain tunnel method (opening the face) in addition to the urban tunnel auxiliary method. It is also effective as a construction technique. The pipe roof construction method is a construction technique that ensures the stability of the natural ground at the top of the excavation section by burying a steel pipe with an outer diameter of approximately 200 to 1200 mm horizontally in the ground before excavating the underground space. This is an auxiliary construction method that establishes safe construction by preventing the collapse of the natural ground of the crown part of the building.

  However, in the conventional pipe roof construction technique, there are male and female joints (various joints) for each steel pipe because of the embedding of each single pipe (generally, the horizontal press-fit method and the propulsion method). In general, it is necessary to connect with an ST joint or an AH joint), and the joint steel material becomes expensive in addition to the cost of the steel pipe itself, and there are many problems in terms of economy. On the other hand, Patent Document 1 discloses a technique that allows a plurality of steel pipes to be integrally connected in parallel with an inexpensive connection member so that they can be press-fitted at the same time, and the amount of expensive joints used can be reduced and implemented at low cost. It is disclosed.

  However, in the pipe roof method, when the male joint of the steel pipe to be press-fitted next is fitted into the female joint of the press-fitted steel pipe, the earth and sand that has entered the female joint increases the press-fitting resistance and the joint In some cases, deformation is unavoidable, and in the worst case, dropout of the welded part of the joint and directional displacement of the steel pipe do not fall within the specified range, and there are many cases where poor accuracy occurs.

JP 2007-162269 A

  The problem to be solved by the present invention is to solve these conventional problems, and when mating a male joint with a female joint, by removing earth and sand that has entered the female joint, This is to reduce the resistance of the joint and prevent deformation of the joint and drop-off of the welded portion, and keep the directional displacement of the steel pipe within the specified range so that the construction can be performed with high accuracy.

The configuration of the present invention that solves this problem is as follows.
1) An excavator is detachably attached to the tip of a steel pipe having a male joint and a female joint on the left and right sides, and the outer diameter of the steel pipe with the leading joint is attached to the rear end of the steel pipe with the leading joint. A steel pipe with a joint of the same size and the same structure in which the male and female joints, which are the same as the outer diameter of the steel pipe and attached to the left and right sides of the steel pipe, are the same in size and shape, are successively added to the column, and the last joint is attached. While pressing the steel pipe from behind and excavating the ground with an excavator, press the steel pipe with joints into the ground, press the steel pipe with multiple joints into the ground, and then press the steel pipe with the joints It is assumed that another steel pipe with a joint of the same size and structure is placed in the adjacent position, and that the excavator is also detachably attached to the tip of the top steel pipe with this other joint, and is first press-fitted into the ground first. Steel pipe with another joint as described above in a female joint of a steel pipe with a joint While fitting another male joint, another steel pipe with a joint of the same structure is added in series to the rear, and the steel pipe with the last joint is pressed from the rear by using an excavator at the front end. While excavating the ground, this steel pipe with another joint is press-fitted into the ground, and the steel pipe with another joint is press-fitted into the ground with the joint being connected to the steel pipe with another joint. In the pipe roof construction method that constructs a collapsing protection wall with steel pipes with joints repeatedly connected, a high-pressure injection nozzle that injects high-pressure air, water, or muddy water at the tip of the male joint of the steel pipe with the top joint The male joint can be smoothly fitted to the female joint while removing the sand and sand that has entered the female joint to which the adjacent steel pipe with the joint is fitted by the injection of the high-pressure jet nozzle. Pipe roof construction method 2) Multiple Integrally connected to the parallel steel pipe connecting member, the distal ends of the steel pipes linked steel pipe Fukuren steel with joints respectively the male fitting and the female fitting on the left and right ends, excavating machine A male joint and a female joint, each of which is detachably attached, and has the same outer dimensions of the double-connected steel pipe connected at the head to the rear end of the double-ended steel pipe with the leading joint , and attached to the left and right of the double-ended steel pipe geometry of the joint replenishment sequentially tandem to Fukuren steel with joints of the same dimensions the structure is the same, while excavating the ground by pressing the Fukuren steel pipe with end fittings from the rear in the excavator fittings After press-fitting multiple steel pipes with pipes into the ground, and press-fitting multiple steel pipes with multiple joints into the ground, another joint of the same size and structure is located adjacent to the double steel pipe with the press-fitted joints. Each steel of the top duplex pipe with a separate joint is arranged. The excavator is also detachably attached to the tip of the steel pipe, and the male joint of the above-mentioned multiple steel pipe with another joint is fitted into the female joint of the double steel pipe with the joint press-fitted into the ground first. At the rear, another multiple steel pipe with a joint of the same size and structure is added in series, and the rear end of the multiple steel pipe with another joint is pushed from the rear by an excavator at the front end. While excavating the ground, a double steel pipe with another joint is press-fitted into the ground, and the double steel pipe with another joint is press-fitted into the ground with another joint with the joint. and, in the pipe roof method for constructing a collapse protection wall Fukuren steel with continuously provided the joint by repeating this process, high pressure air or water or the tip portion of the male joint Fukuren steel pipe with the head of the joint A high-pressure injection nozzle that injects muddy water is installed, and it is adjacent by the injection of the high-pressure injection nozzle. Characterized in that the male joint to be smoothly fitted in the female joint while removing soil that has entered the female the joint Fukuren steel with joints that, the pipe roof method 3) high pressure air Alternatively, a supply pipe for supplying water or muddy water is provided so as to be rotatable across the front and rear ends of the male joint, and a high-pressure injection nozzle is attached to the tip of the supply pipe at an angle with respect to the press-fitting direction. and rotational operation to remove the sediment that has entered the female coupling so as to inject while rotating the high-pressure injection nozzle, to supply the 1) or 2) a pipe roof method 4 described) high pressure air or water or mud A supply pipe is installed over the front and rear ends of the male joint, and a high-pressure injection nozzle is attached to the tip of the supply pipe so as to be rotatable with respect to the press-fitting direction, and is electrically or hydraulically attached to the outside of the steel pipe equipped with the excavator. Remove the rotating device in a sealed manner Only, to remove sediment that has entered the female coupling so as to inject while rotating the supply pipe itself, which is connected to the high-pressure injection nozzle or a high pressure injection nozzle with a rotation device, a pipe roof of the 1) or 2), wherein It is in the construction method.

According to the configuration described in 1) and 2) of the present invention, when high-pressure air, water, or muddy water is injected from a high-pressure injection nozzle when press-fitting a steel pipe or a double steel pipe with a joint , the injection is already performed by the injection. The earth and sand in the female joint of the adjacent steel pipe with a joint or a double steel pipe is blown off and removed. Therefore, since the resistance when fitting the male joint to the female joint is reduced, deformation of the joint and dropout of the welded portion are prevented, and the directional displacement of the steel pipe or double steel pipe with the joint is kept within the specified range. Can be constructed with high accuracy.

According to the 2) according construction of the present invention, in addition to the effect of the previous SL configurations, so good in form of a pair of left and right fitting into a plurality of concatenated Fukuren steel pipes amount of expensive joints is reduced It can be carried out at a low cost, and a plurality of connected double steel pipes can be press-fitted at the same time, thereby shortening the construction period.

According to the configuration described in the above 3) of the present invention, the tip of the inclined high-pressure injection nozzle turns to change the injection direction, and the earth and sand in the female joint of the adjacent steel pipe with joint or press- fitting and the double steel pipe Is blown away over a wide area and removed. Therefore, the earth and sand can be more reliably removed to every corner, and the resistance during fitting can be further reduced.

  According to the configuration described in 4) of the present invention, in addition to the effects of the configuration described in 3), the rotation of the high-pressure injection nozzle can be automated.

1 is an end view of a duplex steel pipe with a joint of Example 1. FIG. 3 is an enlarged perspective view of a male joint of Example 1. FIG. It is explanatory drawing which shows the press injection of the duplex steel pipe with a joint of Example 1. FIG. It is explanatory drawing which shows the removal of the earth and sand in the female coupling of Example 1. FIG. It is a front view of the collapse protection wall constructed in Example 1. It is an enlarged view which shows the structure of the high pressure injection nozzle of Example 2. FIG. It is an enlarged view which shows the structure of the rotation apparatus of the high pressure injection nozzle of Example 3. FIG.

The supply pipe of the present invention includes a method of piping from the start shaft to the position of the face along the male joint, and a method of piping from the inside of the excavator to the outside of the steel pipe. DESCRIPTION OF EMBODIMENTS Hereinafter, modes for carrying out the present invention will be specifically described with reference to each embodiment and drawings. As for the steel pipe with a joint of the present invention, there is a type in which a male / female joint is attached to the left and right of a single pipe as in claim 1 or a multiple pipe as in claim 2.

(Embodiment 1) In Embodiment 1 shown in FIGS. 1 to 5, a tunnel collapse protection wall is constructed by a pipe roof construction method using a duplex steel pipe having a joint with a high pressure injection nozzle fixed at a fixed position. This is an example. 1 is an end view of a duplex steel pipe with a joint of Example 1, FIG. 2 is an enlarged perspective view of a male joint of Example 1, and FIG. 3 is an explanatory view showing press-fitting of a duplex steel pipe with a joint of Example 1. FIG. 4 is an explanatory view showing the removal of earth and sand in the female joint of the first embodiment, and FIG. 5 is a front view of the built-up collapse protection wall of the first embodiment.

In the figure, 10 is a duplex steel pipe with a joint which is a double steel pipe in which two steel pipes 10a and 10b are connected in parallel , 10a and 10b are steel pipes, 11 is a connecting member, 12 is a female joint, and 13 is a male joint. , 14 is a high-pressure injection nozzle, 15 is a supply pipe, 16 is a water supply hose, 20 is an excavator, 30 is a main pusher, G is ground, Ga is earth and sand, P is a pump, and W is water.

As shown in FIG. 1, the double steel pipe 10 with a joint of the first embodiment is integrally connected by welding two steel pipes 10 a and 10 b in parallel with a connecting member 11 made of H-shaped steel. Three steel pipes may be connected to form a triple. A female joint 12 is welded to the right side of the right steel pipe 10a, and a male joint 13 is welded to the left side of the left steel pipe 10b.

The male joint 13, as shown in FIG. 2, and the pipe by welding the supply pipe 15 of the pipe diameter 12mm respectively over from the front end to the rear end of the outer intermediate portion and the inner corner portion, the first fitting A high-pressure injection nozzle 14 is attached to each of the tip portions of the supply pipe 15 of the attached duplex steel pipe 10, and the high-pressure injection nozzle 14 is not attached to the supply pipe 15 of the duplex steel pipe 10 with a joint for subsequent use. The rear end of the supply pipe 15 can be directly connected. The supply pipe 15 may be piped inside the steel pipe 10b. The excavator 20 has a structure in which the cutter at the tip can be stored smaller than the inner diameter of the steel pipes 10a and 10b, and can pass through the steel pipes 10a and 10b to be collected.

As shown in FIG. 3, an excavator 20 is attached to the tip of a duplex steel pipe 10 with a leading joint, and the duplex steel pipe 10 with the joint is pressed from behind by a main pushing device 30, and the ground is excavated by the excavator 20. While excavating G, the steel pipes 10a and 10b are simultaneously pressed into the ground. The necessary number of duplex steel pipes 10 with subsequent joints are added to the rear end of the press-fitted duplex steel pipe 10 with the leading joint , and press-fitted in order by the main pusher 30. When the construction of the first and second holes is completed, each excavator 20 is collected from the steel pipes 10a and 10b to the arrival side. When the reaching side is not opened under construction conditions, each excavator 20 is pulled back to the start side through the steel pipes 10a and 10b and collected. Sediment Ga has entered the female joint 12 of the press-fitted duplex steel pipe 10.

When press-fitting the double steel pipe 10 with the joints after the third and fourth holes, the water supply hose 16 and the pump P are connected to the rear end of the supply pipe 15. When the pump P is operated in parallel with the press-fitting, as shown in FIG. 4, high-pressure water W is jetted from the high-pressure jet nozzle 14, and the female W of the adjacent double- jointed steel pipe 10 with the joint into which the water W has been press-fitted. The male joint 13 is fitted to the female joint 12 while blowing the earth and sand G in the mold joint 12. Thereafter, the double steel pipes 10 with joints after the fifth and sixth holes are repeatedly subjected to the same process, and the arch-shaped collapsible protective wall shown in FIG. 5 is constructed by the many steel pipes 10a and 10b provided in series. .

Thus, according to Example 1, since the earth and sand G in the female joint 12 is removed by the injection of water W, the resistance when fitting the male joint 13 to the female joint 12 is reduced. The deformation of the joint and the dropout of the welded portion are prevented, and the directional displacement of the duplex steel pipe 10 with the joint can be kept within the specified range and can be constructed with high accuracy. Air or muddy water may be used in place of the water W, and the shape of the high-pressure spray nozzle 14 is selected according to construction conditions such as the presence or absence of groundwater, soil particle composition, ground strength, particle size distribution, and construction extension.

(Embodiment 2) Embodiment 2 shown in FIG. 6 is an example of a pipe roof construction method in which an inclined high-pressure injection nozzle and a supply pipe are rotatably attached. FIG. 6 is an enlarged view showing the structure of the high pressure injection nozzle of the second embodiment. In the figure, 17 is a support metal fitting. The supply pipe 15 of the duplex steel pipe 10 with a joint for subsequent use is connected to the rear end of the leading supply pipe 15 directly without being attached with the high-pressure injection nozzle 14 so that it can rotate.

  In the second embodiment, as shown in FIG. 6, the high pressure injection nozzle 14 is attached to be inclined with respect to the supply pipe 15, and the supply pipe 15 is attached to a plurality of support fittings from the inner end to the rear end of the male joint 13. 17 is rotatably provided.

When press-fitting the double steel pipe 10 with a joint , water is supplied by the pump P and high-pressure water W is injected from the high-pressure injection nozzle 14, and a hand handle (not shown) is attached to the rear end of the supply pipe 15 and rotated. Then, the tip of the inclined high-pressure injection nozzle 14 turns to change the injection direction of the water W, and the earth and sand G in the female joint 12 of the double steel pipe 10 with the adjacent joint that has been press-fitted extends over a wide range. Blowed away. Therefore, compared with Example 1, the earth and sand G can be more reliably removed to every corner, and the resistance at the time of fitting can be further reduced. In other respects, the reference numeral, configuration, and operational effects are the same as those in the first embodiment.

(Embodiment 3) Embodiment 3 shown in FIG. 7 is an example of a pipe roof construction method in which the rotation of the high-pressure injection nozzle is motorized by a rotating device. FIG. 7 is an enlarged view showing the structure of the rotating device for the high-pressure injection nozzle according to the third embodiment. In the figure, 15a is a gear, 18 is a motor, 18a is a pinion, 18b is a power cable, and 19 is a case.

  In the third embodiment, as shown in FIG. 7, a gear 15 a is attached to the rear portion of the high-pressure injection nozzle 14, a motor 18 having a pinion 18 a is attached to an adjacent position and meshed with the gear 15 a, and a power cable 18 b of the motor 18 is engaged. Are connected in parallel with the supply pipe 15 and connected to an external power source (not shown), and the pinion 18a and the motor 18 are covered with a case 19 in a sealed manner. The high-pressure spray nozzle 14 is tilted with respect to the supply pipe 15 and is rotatably mounted. The supply pipe 15 and the power cable 18b are arranged in the steel pipe 10b from the middle, and a part of the mud for excavation supplied to the excavator 20 Can be branched and supplied to the supply pipe 15.

When the duplex steel pipe 10 with a joint is press-fitted, when a part of the muddy water supplied to the excavator 20 is supplied to the high-pressure injection nozzle 14 through the supply pipe 15 and injected, and the motor 18 is operated, the inclined high-pressure injection The tip of the nozzle 14 is swung to change the injection direction of the muddy water, and the earth and sand G in the female joint 12 of the adjacent steel pipe 10 with the joint that has been press-fitted in the same manner as in the second embodiment is blown over a wide range. Removed. Therefore, the earth and sand G can be removed more reliably than in the first embodiment to further reduce the resistance during fitting, and the rotation of the high-pressure spray nozzle 14 can be automated as compared with the second embodiment.

  In the third embodiment, the electric motor 18 is exemplified as the rotation method of the high-pressure injection nozzle 14. However, a hydraulic motor can be used, and further, a hydraulic motor using the water pressure of the water W for injection is also possible. . Further, not only the single high-pressure injection nozzle 14 but also the supply pipe 15 itself connected to the high-pressure injection nozzle 14 may be rotated. In other respects, the reference numeral, configuration, and operational effects are the same as those in the first embodiment.

  The technology of the present invention is used for protection work for tunnels and underground objects, prevention of collapse of natural ground, and prevention of settlement of buildings and roads.

10- jointed double steel pipe 10a, 10b Steel pipe 11 Connecting member 12 Female joint 13 Male joint 14 High-pressure injection nozzle 15 Supply pipe 15a Gear 16 Water supply hose 17 Support metal fitting 18 Motor 18a Pinion 18b Power cable 19 Case 20 Excavator 30 Former press device G Ground Ga Earth and sand P Pump W Water

Claims (4)

An excavator is detachably attached to the tip of a steel pipe that has a male joint and a female joint on the left and right, and the outer diameter of the steel pipe with the leading joint is outside the steel pipe at the rear end of the steel pipe with the leading joint. A steel pipe with a joint of the same size and the same structure with the same dimensions and shape of the male and female joints, which are the same in diameter and attached to the left and right of the steel pipe, are successively added in series, and the steel pipe with the last joint Pressing from the rear and excavating the ground with an excavator, press the steel pipe with joints into the ground, press the steel pipe with multiple joints into the ground, and then the adjacent position of the steel pipe with the joints that have been press-fitted A pipe with a joint of the same size and the same structure is placed on the top, and an excavator is also detachably attached to the tip of the top steel pipe with another joint, and the joint is press-fitted into the ground first. The male pipe of the steel pipe with the other joint is connected to the female joint of the steel pipe with the other pipe. While fitting the joint, another jointed steel pipe with the same structure is added to the back of the pipe in series, and the steel pipe with the last joint is pressed from the rear to excavate the ground with the excavator at the front end. However, the steel pipe with another joint is press-fitted into the ground, and the steel pipe with another joint is press-fitted into the ground with the joint and the steel pipe with another joint connected to each other. in the pipe roof method for constructing a collapse protection walls set the steel pipe with a joint, provided with a high-pressure injection nozzle for injecting high pressure air or water or mud on the tip portion of the male joint of the steel pipe with the top of the joint, the pressure A pipe characterized in that the male joint can be smoothly fitted to the female joint while removing the soil and sand that has entered the female joint to which the adjacent steel pipe with the joint is fitted by the injection of the injection nozzle. Roof construction method. Integrally connected to the parallel multiple steel pipe connecting member, the male joint and the female joint to the distal end portion of the steel pipe Fukuren steel pipe with provided joints respectively to the right and left ends of the connected steel pipes, drilling The male joints attached to the left and right of the duplex steel pipe have the same external dimensions of the duplex steel pipe connected at the head to the rear end of the duplex steel pipe with the leading joint. Duplex steel pipes with joints of the same size and structure with the same size and shape of the female joints are successively added in cascade, and the ground is excavated by each excavator by pressing the double steel pipe with the last joint from the rear. However, after press-fitting multiple steel pipes with joints into the ground, and press-fitting multiple steel pipes with joints into the ground, another identically-sized structure is located adjacent to the double steel pipe with the joints that have been press-fitted. Place a double steel pipe with one joint, and the top double steel pipe with another joint An excavator is also detachably attached to the tip of each steel pipe, and the male joint of the double steel pipe with the above-mentioned other joint is added to the female joint of the double steel pipe with the joint previously press-fitted into the ground. In the rear, another multiple steel pipe with a joint of the same size and the same structure is added in series, and the rear end of the double steel pipe with another joint is pushed from the rear to excavate the leading end. While excavating the ground with a machine, press the multiple steel pipes with other joints into the ground, and connect the double steel pipes with other joints to the joints with the joints that were previously press-fitted into the ground. pressed, in a pipe roof method for constructing a collapse protection wall Fukuren steel with continuously provided the joint by repeating this process, high pressure air or the distal end of the male joint Fukuren steel pipe with the head of the joint A high-pressure injection nozzle that injects water or muddy water is provided, and the injection of that high-pressure injection nozzle Characterized in that to be able to smoothly fit the male joint into the female joint while removing soil that has entered the female the joint Fukuren steel pipe with the adjacent joint, the pipe roof method. A supply pipe for supplying high-pressure air, water, or muddy water is rotatably provided across the front and rear ends of the male joint, and a high-pressure injection nozzle is attached to the tip of the supply pipe at an angle with respect to the press-fitting direction. The pipe roof construction method according to claim 1 or 2, wherein the earth and sand that have entered the female joint are removed by rotating the rear end and spraying while rotating the high-pressure spray nozzle. A supply pipe that supplies high-pressure air, water, or muddy water is piped across the front and rear ends of the male joint, and a high-pressure injection nozzle is attached to the tip of the supply pipe so as to be rotatable with respect to the press-fitting direction. An electric or hydraulic rotating device is attached in a sealed manner outside the steel pipe provided, and the rotating device penetrates the female joint so that the supply pipe connected to the high-pressure injection nozzle or the high-pressure injection nozzle is rotated and injected. The pipe roof construction method according to claim 1 or 2, wherein the earth and sand removed .

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