JP2683515B2 - Male / female joint of earth retaining pipe, connecting device, and method for forming mountain retaining wall using earth retaining pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an earth retaining pipe connecting device and a method of forming a mountain retaining wall body using the earth retaining pipe.

[0002]

2. Description of the Related Art A construction of a tunnel directly under a railway, a road, a river, a building, etc. to construct a railway, a road, etc. at a grade-overpass, a banking or revetment work, or underpinning of a building, etc. The pipe for propelling may be propelled into the ground to reinforce the ground. That is, a plurality of earth retaining pipes are horizontally arranged and propelled into the ground to form a mountain retaining wall body. The mountain retaining wall supports the upper load to prevent the ground from collapsing, and works such as road construction are performed inside the mountain retaining wall (lower portion). The mountain retaining wall body is configured in various shapes as illustrated in FIG. 9 according to the purpose.

In this construction method, in order to improve the construction accuracy when propelling the pipe into the ground and to secure the robustness and watertightness of the mountain retaining wall body made of the pipe, as shown in FIG. 10 or FIG. Adjacent earth retaining pipes 101, 101 are connected to each other by the illustrated connecting device 100 as shown in FIG.

The connecting device 100 comprises a male joint 102 and a female joint 103. Male joint 102 and female joint 10
3 is formed by welding a pair of long members having an L-shaped cross section, such as angle steel, to the outer peripheral surface of the earth retaining pipe 101. The male joint 102 shown in FIG. 10 is formed by welding the shaped steels to the outer peripheral surface of the earth retaining pipe 101 at predetermined intervals so that the tips of the flange portions of the pair of shaped steels face outward. The male joint 102 shown in FIG. 11 is made by welding T-shaped steel to the outer peripheral surface of the earth retaining pipe 101. The female joint 103 is formed by welding the shaped steels to the outer peripheral surface of the earth retaining pipe 101 at predetermined intervals so that the tips of the flange portions of the pair of shaped steels face inward.

[0005]

The connecting device 100 described above is provided.
Both the male joint 102 and the female joint 103 project outward from the outer peripheral surface of the earth retaining pipe 101. In view of the strength required for the mountain retaining wall body and the strength of the joint member, the amount of protrusion is generally set to 50 mm or more according to the product standard of the shaped steel used. The portions of the joints 102, 103 protruding from the outer peripheral surface of the soil retaining pipe 101 may be subjected to a large press-fitting resistance when the soil retaining pipe 101 propels in the ground, and may be deformed due to the resistance of the ground. In such a case, adjacent earth retaining pipes will not be correctly connected to each other, and in the ground with groundwater, the water leakage between the joints will be significantly reduced due to the deformation of the joints, which will significantly reduce the waterstop between the joints. There was an inconvenience.

[0006] In particular, when an obstacle such as a cobblestone, a piece of wood, or a concrete block contained in the ground or a hard ground where the connecting device cannot penetrate, these obstacles must be removed manually, and the work must be done. Took a long time and was at great risk.

In order to solve the above problem, when the earth retaining pipe is propelled into the ground and the excavation bit is rotated at the tip of the earth retaining pipe to excavate the ground, a chain line in FIG. As shown in the figure, overexcavation is performed from the outer peripheral surface of the earth retaining pipe 101 to a position close to the outer line of the connecting device 100, that is, in consideration of the protrusion amount of the connecting device 100, the diameter is made larger than the outer diameter of the earth retaining pipe 101. It is possible to drill. However, as shown in FIG. 12, the joint of the coupling device 100 provided on the earth retaining pipe 101 that has been previously propelled has a drill bit that rotates at the tip of the earth retaining pipe 101 that is being subsequently propelled. Due to the contact, such overcutting was practically impossible. Therefore, the earth retaining pipe 101 being promoted subsequently
The center axis of rotation of the excavating bit that rotates at the tip of the excavating bit is eccentric with respect to the central axis of the earth retaining pipe 101, and the excavating bit is connected to the connecting device 100 of the adjacent earth retaining pipe 101 that was previously driven. Try not to touch. However, it is difficult to adjust the eccentricity of the center axis of rotation of the excavating bit, and if the eccentricity is too large, the earth retaining pipe 101 will move in a direction in which the pair of joints that are connected to each other and that constitute the connecting device 100 are separated from each other. There was a problem in which the pair of joints that were propelled and connected were separated.

According to the present invention, the connecting device of the earth retaining pipe propelled into the ground is unlikely to be clogged with earth and sand, and the connecting device is deformed even on the ground having a large propulsion resistance or the ground containing obstacles. The purpose of the present invention is to make it possible to propel the earth retaining pipe relatively easily and to prevent water from leaking from the connecting device of the earth retaining pipe.

[0009]

The female joint of the earth retaining pipe according to claim 1 connects the earth retaining pipes which are propelled into the ground so as to be adjacent to each other so as to be substantially parallel to each other. Therefore, in the female joint of the other earth retaining pipe that engages with the male joint of the one earth retaining pipe, the male joint is continuously provided on the outer peripheral surface of the earth retaining pipe along the axial direction. A guide space that engages with the guide space is provided continuously along the guide space between the guide space and the outer peripheral surface of the earth retaining pipe, and the injection material supplied to the inside is the propelling direction of the earth retaining pipe. And an injection material pumping space in which an injection hole for injecting the injection material into the ground is formed.

A male joint of an earth retaining pipe according to a second aspect of the present invention is used for retaining an earth retaining pipe in order to connect the earth retaining pipes which are propelled into the ground so as to be substantially parallel to each other. A guide space continuously provided along the axial direction on the outer peripheral surface of the pipe, and continuously provided along the guide space between the guide space and the outer peripheral surface of the earth retaining pipe,
A female joint for an earth retaining pipe having an injecting material supplied therein, which is guided in a propelling direction of the earth retaining pipe, and having an injecting material feeding space formed with an injection hole for injecting the injecting material into the ground. In the male joint of the other earth retaining pipe that engages, a guide portion that engages with the guide space of the female joint,
And a mounting portion provided with a recess in a portion fixed to the outer peripheral surface of the soil retaining pipe, so that the soil retaining pipe can be stably fixed to the outer peripheral surface of the soil retaining pipe. To do.

According to a third aspect of the present invention, there is provided an earth retaining pipe connecting device for adjoining soil retaining pipes for connecting earth retaining pipes which are propelled into the ground so as to be substantially parallel to each other. The female joint of the earth retaining pipe according to claim 1, wherein the female joint is provided on the retaining pipe and engages with each other.
It is characterized by having a male joint of the earth retaining pipe described.

According to a fourth aspect of the present invention, there is provided a method for forming an earth retaining wall using an earth retaining pipe, wherein a plurality of earth retaining pipes are adjacently propelled into the ground so that they are substantially parallel to each other. In the method of forming the earth retaining wall body using the earth retaining pipe for forming the earth retaining wall body, the male joint according to claim 2 provided on the first earth retaining pipe propelled into the ground, The earth retaining pipe at the tip of the second earth retaining pipe when the female joint according to claim 1 provided on the second earth retaining pipe is engaged to propel the second earth retaining pipe. And excavating a range wider than the diameter of 3 by the height of the male joint, and supplying the injectant to the injectant pumping space of the female joint to inject the injectant into the ground through the injection hole. To do.

[0013]

FIG. 1 shows an example of an embodiment of the present invention.
This will be described with reference to FIGS. In this example, as shown in FIG. 1, the plurality of earth retaining pipes 1 forming the mountain retaining wall body 10 are one reference pipe 1a that is propulsed and arranged in the approximate center of the ground to be promoted, and both sides thereof. It is divided into a plurality of subsequent tubes 1b that are propelled and arranged in the. As shown in FIG. 1, FIG. 2 and FIG. 3, the reference pipe 1 a is paired at two positions symmetrical to each other on the outer peripheral surface of the earth retaining pipe 1 along the axis of the earth retaining pipe 1 by welding or the like. The male joint 2 is fixed. As shown in FIGS. 3 and 5, the male joint 2 has a substantially H-shape in a cross section orthogonal to the axis of the earth retaining pipe 1. The male joint 2 is fixed to the outer peripheral surface of the earth retaining pipe 1 perpendicularly to the fixing portion 2a, the guide portion 2b orthogonal to the fixing portion 2a, and the outer peripheral surface of the earth retaining pipe 10 by welding or the like. It has a mounting portion 2c to be mounted. A recess 2d is provided on the outer peripheral surface side of the earth retaining pipe 10 of the mounting portion 2c. Therefore, as shown in FIG. 5, the attachment portion 2c has the earth retaining pipe 101-1, which has a small radius, and the earth retaining pipe 101, which has a large radius.
Even with -2, it can be stably fixed to the outer peripheral surface of the soil retaining pipe according to the pipe diameter. Therefore, the male joint 2 of this example can be applied to an earth retaining pipe having an arbitrary outer diameter.

As shown in FIGS. 1, 2 and 3, the trailing pipe 1b is located at two symmetrical positions on the outer peripheral surface of the earth retaining pipe 1 along the axis of the earth retaining pipe 1 and is welded or the like. The male joint 2 and the female joint 3 are respectively fixed by means. The structure of the female joint 3 will be described with reference to FIGS. 3 and 4. The female joint 3 has a pair of legs 4 and 4 fixed to the outer peripheral surface of the earth retaining pipe 1. The pair of legs 4 and 4 face each other at a predetermined interval. The pair of legs 4, 4 are fixed by a partition plate 6 in a posture that is substantially orthogonal to the radial direction of the soil retaining pipe 1, and the space substantially partitioned by the pair of legs 4, 4 is divided into two upper and lower spaces. It is divided into spaces. A space is provided between the upper ends of the pair of legs 4 and 4, and a groove 5 parallel to the axis of the earth retaining pipe 1 is formed.

The upper space is a guide space 7 with which the guide portion 2b of the male joint 2 is engaged. When the guide portion 2b of the male joint 2 is engaged with the guide space 7, the fixing portion 2a of the male joint 2 is provided.
Is inserted into the groove 5 of the female joint 3. The space on the lower side is an injection material pumping space 8 in which the injection material is pumped. A pair of legs 4,
An injection hole 9 for injecting the injection material into the ground is formed in the portion of the earth retaining pipe 4 near the outer peripheral surface. The shape of the injection hole 9 is preferably the round shape shown in FIG.
In addition, it is convenient that the round injection hole 9 is threaded so that it can be closed with a screw-type plug if necessary. The number and position of the injection holes 9 are not limited, but it is preferable to provide an appropriate number at an appropriate location according to the soil quality of the ground to be propelled. The partition plate 6 is filled with an injection material into the guide space 7 to reduce the sliding resistance of the male joint 2 and the female joint 3,
An injection hole 9a for preventing water from leaking from the joint portion is formed.

The injecting material is a gel-like substance that fills the periphery of the earth retaining pipe 1 propelled into the ground to prevent water discharge and ground collapse. For example, a substance capable of pressure-feeding the inside of the injection material pressure-feeding space 8 such as a substance obtained by kneading bentonite and clay or a substance obtained by kneading a highly water-absorbing substance can be used. However, the material that solidifies the inside of the injection material pumping space 8 and the circumference of the earth retaining pipe 1 is excluded.

The height of the female joint 3 is larger than that of the male joint 2. That is, when attached to the outer peripheral surface of the soil retaining pipe 1, the female joint 3 projects outward in the radial direction of the soil retaining pipe 1.

The step of forming the earth retaining wall 10 using the earth retaining pipe 1 having the male and female joints 2 and 3 will be described. As shown in FIGS. 1 and 6, the reference pipe 1a is propelled to a predetermined position in the ground. A normal propulsion machine is used for propulsion. A tip conduit 11 is fixed to the tip of the reference tube 1a to reinforce the tip of the reference tube 1a. The outer diameter of the leading conduit 11 is substantially equal to the maximum outer diameter of the reference pipe 1a including the height of the male joint 2. Inside the reference tube 1a, an inner tube which is rotationally driven by the rotating means of the propulsion device is arranged. A drill bit 12 is attached to the tip of the inner pipe.
Project in front of the front conduit 11. The digging outer diameter of the digging bit 12 is substantially the same as the outer diameter of the leading conduit 11, so that the range of the maximum outer diameter of the reference pipe 1a including the height of the male joint 2 can be drilled. The reference tube 1a is propelled into the ground by the propulsion means of the propulsion unit.

While driving the propulsion device to rotate the excavation bit 12, the reference pipe 1a is press-fitted into the ground from within the starting shaft 20 and the excavation bit 12 is cut into the ground in front of the reference pipe 1a. To drill. The pair of joints provided on the reference pipe 1a are both male joints 2, and the drill bit 1
2 excavates within the range of the outer diameter of the reference pipe 1a including the male joint 2, so that the propulsion resistance of the reference pipe 1a is extremely small.
The required number of reference pipes 1a are sequentially connected and propelled according to the propulsion length, and the reference pipe 1a at the tip reaches the reaching shaft 21.

As described above, the joints of the reference pipe 1a are all male joints 2, and the propulsion resistance is originally smaller than that of the succeeding pipe 1b in which at least one of the pair of joints is the female joint 3. Therefore, when propelling the reference pipe 1a described above, the excavation range of the excavation bit 12 does not necessarily have to be large as described above. For example, as shown by a broken line around the reference pipe 1a in FIG. It can be sufficiently propelled by excavating a range smaller than the height and larger than the outer diameter of the reference pipe 1a.

After propelling the reference pipe 1a, the succeeding pipe 1b is arranged next to the reference pipe 1a in a substantially parallel state and propelled. As shown in FIGS. 2, 6 and 7, one male joint 2 of the reference pipe 1a is engaged with the guide space 7 of the female joint 3 of the succeeding pipe 1b, and the succeeding pipe 1b is propelled by the propulsion device. At the time of propulsion of the succeeding pipe 1b, as shown by a chain line around the succeeding pipe 1b in FIG. 2, the region inside the height of the male joint 2 is excavated.
The entire female joint 3 of the succeeding pipe 1b does not fall within this excavation range, but at least the tip portion of the female joint 3 of the succeeding pipe 1b has an existing earth retaining pipe 1 (in this case, the reference pipe 1).
Since it is within the range of the male joint 2 which is the excavation range of a), it is not necessary to directly receive the resistance from the ground.

When propelling the succeeding pipe 1b, the pouring material is fed into the pouring material pumping space 8 of the female joint 3 of the succeeding pipe 1b by applying a predetermined pressure. The injection material is the female joint 3 of the following tube 1b to be propelled.
Inject from the rear end. When the injection hole 9, 9a of the female joint 3 of the earth retaining pipe 1b being propelled is not yet in the ground and is located in the starting shaft 20, the injection hole 9, 9a is closed with a plug. The injection material is prevented from being ejected into the starting shaft 20. Immediately before the plugged injection holes 9 and 9a go into the ground, the injection of the injection material is stopped, and after the plug is removed, the injection material is propelled to propel the injection holes 9 and 9a into the ground. Then, the injection of the injection material is restarted.

The pouring material supplied to the pouring material pumping space 8 of the female joint 3 is jetted into the ground from the pouring hole 9 in the ground, thereby reducing the frictional resistance of the ground during propulsion.
Further, the injection material jetted into the ground fills the void S between the soil retaining pipe 1 and the ground as shown in FIG. 2 to prevent the ground from collapsing and the groundwater from leaking. Further, since this injection material is also ejected into the guide space 7 of the female joint 3, the frictional resistance due to the sliding of the female joint 3 and the male joint 2 which are engaged with each other and slide is reduced, and the guide of the female joint 3 is reduced. Sediment excavated in space 7
It prevents pebbles and the like from flowing in and causing clogging, and also prevents groundwater from leaking from the gap between the joints 2 and 3.

After that, the succeeding tube 1b is similarly driven in sequence. How many tubes are connected and propelled at each position, that is, the propulsion distance at each position is determined by the retaining wall body 1 to be formed.
It depends on the size of 0. Further, the arrangement pattern of the earth retaining pipes 1 viewed in a plane orthogonal to the propelling direction differs depending on the purpose of use of the retaining wall body to be constructed, and for example, as shown in FIG.
Various arrangements as shown in (a), (b) and (c) are possible.

FIG. 8 shows another example of the shape of the female joint. The female joint 3a can be formed by using a shape steel or a steel material that is generally easily available. The same components as those of the female joint 3 described above are denoted by the same reference numerals as those in FIG. For this female joint 3a, it is also possible to use a male joint made of the shaped steel shown in FIGS. 10 to 11 in combination.

[0026]

According to the present invention, the earth retaining pipe is
When propelling into the ground while connecting with the female joint, the injectable material can be fed into the ground through the injecting material pumping space provided inside the female joint. For this reason, propulsion resistance is reduced and the excess space can be filled, so there is no ground subsidence due to the effect of excess excavation, and the guide space for the female joint with which the male joint engages is prevented from being clogged with earth and sand. The male and female joints can slide smoothly. In addition, the guide space of the earth retaining pipe joint is constantly filled with the injection material, so that a water blocking effect can be obtained. Further, after the earth retaining wall body is formed, if the injecting agent that finally solidifies the void around the earth retaining pipe is injected by using the injecting agent pumping space, leakage of groundwater or the like can be completely prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing an underground connection state of an earth retaining pipe in an example of an embodiment of the present invention.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 (a) is a front view of a female joint provided on the earth retaining pipe in the example of the embodiment of the present invention,
(B) is the same side view.

FIG. 5 (a) is a front view of a male joint provided on the earth retaining pipe in the example of the embodiment of the present invention,
(B) is the same side view.

FIG. 6 is a diagram showing a process of propelling the earth retaining pipe in the example of the embodiment of the present invention.

FIG. 7 is a diagram showing a process of propelling the earth retaining pipe in the example of the embodiment of the present invention.

FIG. 8 is a front view showing another example of the shape of the female joint according to the embodiment of the present invention.

FIG. 9 is a diagram showing an example of arrangement of earth retaining pipes.

FIG. 10 is a cross-sectional view showing a conventional connecting device for an earth retaining pipe.

FIG. 11 is a cross-sectional view showing a conventional connecting device for an earth retaining pipe.

FIG. 12 is a view showing a propulsion process of an earth retaining pipe performed by using a conventional connecting device.

[Explanation of symbols]

 1 Earth retaining pipe 1a Reference pipe as earth retaining pipe 1b Subsequent pipe as soil retaining pipe 2 Male joint 2b that constitutes a connecting device 2b Guide portion 2c Mounting portion 2d Recessed portion 3,13 Female joint that constitutes a connecting device 7 Guide space 8 Injection material pumping space 9, 9a Injection hole

Claims (4)

(57) [Claims] 1. To connect earth retaining pipes that are propelled into the ground next to each other substantially parallel to each other,
In the female joint of the other earth retaining pipe that engages with the male joint of one soil retaining pipe, the male joint is engaged continuously with the outer circumferential surface of the soil retaining pipe in the axial direction. A guide space, which is continuously provided along the guide space between the guide space and the outer peripheral surface of the earth retaining pipe, and guides the injection material supplied inside in the propulsion direction of the earth retaining pipe. A female joint for an earth retaining pipe, comprising: an injection material pumping space having an injection hole for injecting the injection material into the ground. 2. To connect earth retaining pipes that are propelled into the ground adjacent to each other so as to be substantially parallel to each other,
A guide space continuously provided along the axial direction on the outer peripheral surface of the soil retaining pipe, and continuously provided along the guide space between the guide space and the outer peripheral surface of the soil retaining pipe. , A female joint of an earth retaining pipe having an injecting material pumping space formed with an injection hole for introducing the injecting material supplied thereinto in the propelling direction of the earth retaining pipe and for injecting the injecting material into the ground In the male joint of the other earth retaining pipe that engages with, a guide portion that engages with the guide space of the female joint, and a mounting portion provided with a recess in the portion fixed to the outer peripheral surface of the earth retaining pipe. Male joint for earth retaining pipe with 3. An earth retaining pipe connecting device for connecting earth retaining pipes propelled into the ground so as to be substantially parallel to each other, wherein the pipes are provided respectively on adjacent soil retaining pipes. 3. An earth retaining pipe connecting device comprising a female joint for retaining earth pipe according to claim 1 and a male joint for retaining earth pipe according to claim 2. 4. A mountain retaining wall body is formed by using a retaining earth pipe to form a retaining wall body by propelling a plurality of retaining pipes adjacent to each other so as to be substantially parallel to each other. In the method, the male joint according to claim 2 provided on the first earth retaining pipe propelled into the ground, and the female joint according to claim 1 provided on the second earth retaining pipe. Combine the second
When propelling the earth retaining pipe, the excavation of a region wider than the diameter of the earth retaining pipe by the height of the male joint at the tip of the second soil retaining pipe and pumping the injection material of the female joint. A method for forming a mountain retaining wall body using a soil retaining pipe, characterized in that an injecting material is supplied to a space and the injecting material is injected into the ground through an injection hole.