JP3872376B2 - Diameter expansion propulsion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention relates to a radially enlarged propulsion device, particularly telecommunications conduit, sewer pipes, to line power sale radially enlarged propulsion device trenchless when buried into the ground a pipe such as a gas pipe.
[0002]
[Prior art]
Conventionally, when pipes such as aeration communication pipes, sewer pipes, gas pipes, etc. are buried in the ground by a non-cutting propulsion method, they are broadly divided into two methods, one-step method and two-step method. As a one-step method, referring to FIG. 6, first, a start shaft 101 and a reach shaft 103 are formed on the ground, and a main pushing device 105 such as a propulsion jack is installed on the start vertical shaft 101. The leading conductor 107 is propelled to the ground in the direction of burying the pipe line. The propulsion pipe 109 continuously follows immediately after the leading conductor 107, and the propulsion pipe 109 is laid as an embedded pipe as it is.
[0003]
As for the two-step method, referring to FIGS. 7A and 7B, as with the one-step method, first, the start shaft 101 and the reaching shaft 103 are formed on the ground, and the start push shaft 105 has a main pushing device 105. Is installed. As a first step, as shown in FIG. 7A, the primary propulsion pipe 113 continuously follows the leading conductor 111 propelled by using the main pushing device 105 to reach the reaching shaft 103. It is buried in the section to be buried. Thereafter, as a second step, as shown in FIG. 7B, the diameter expansion propulsion device 115 uses the main pushing device 105 to propel the primary propelling pipe 113 while propelling it. The buried pipe 117 that follows is replaced with the primary propulsion pipe 113.
[0004]
On the other hand, the leading conductor propulsion method in the above-described non-cutting propulsion method can be broadly divided into three methods: an excavation method, a static press-in method, and a dynamic press-in method.
[0005]
As the excavation method, referring to FIG. 8, the ground on the front surface is excavated by the excavation bit 121 provided at the tip of the leading conductor 119, and the excavated soil is moved backward through the excavation pipe 123 or the excavation auger. It is discharged from the shaft 101. The buried pipe 117 follows the leading conductor 119.
[0006]
As the static press-fitting method, referring to FIG. 9, the soil at the tip of the leading conductor 125 is not discharged, but the tip of the leading conductor 125 is simply inserted into the soil, and the buried pipe that follows the leading conductor 125. 117 is buried.
[0007]
As the dynamic press-fitting method, referring to FIG. 10, a dynamic mechanism 129 such as a vibration mechanism is mounted on the tip of the leading conductor 127, and the leading conductor 127 of the leading conductor 127 is softened by the vibration of the leading conductor 127. It penetrates the tip, and can be applied to hard soil ground even though it is a non-draining press-fitting method.
[0008]
Therefore, when propelling buried pipes with a diameter of about 350 mm or less, the static press-in method is used for relatively soft soil, the dynamic press-in method is used for relatively hard soil, and excavation is used for soil such as reki and cobblestone. The method is adopted. As described above, various leading conductor propulsion methods are selected according to the soil conditions.
[0009]
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional static press-fitting method, high-speed propulsion is possible because there is no earth removal, but since the leading conductor 107 receives the resistance of the front surface as it is, it can be applied only to soft ground such as clay soil. In addition, the applied pipe diameter is also limited to about φ350 mm or less.
[0010]
In addition, in the conventional dynamic press-fitting method described above, high-speed propulsion is possible because there is no earth removal, and propulsion on hard soil is possible. Although smaller than the press-fitting method, the leading conductor 107 receives the resistance of the front surface as it is, so that the pipe diameter applied in hard soil ground is also limited to about φ350 mm or less.
[0011]
Therefore, in order to promote a buried pipe having a pipe diameter of about 350 mm or more, it is necessary to rely on an excavation method. As a result, as shown in FIG. 8, a method of directly propelling the buried pipe 117 by a one-step excavation method or a two-step excavation method is used, and the first step is shown in FIG. As shown in FIG. 11B, the primary propulsion pipe 113 having a small diameter following the leading conductor 111 is propelled by the static press-fitting method, and this primary propulsion pipe 113 serves as a guide in the second step. Either the method of enlarging the diameter with the leading conductor 119 provided with the excavation bit 121 which is a diameter expansion device of the excavation method similar to FIG. 8 is taken.
[0012]
In the case of propelling the buried pipe 117 having a pipe diameter of about 350 mm or more as described above, the method using the one-step excavation method requires only one propulsion step, but all must be completed in one propulsion. In addition to the excavation function, a highly functional leading conductor 107 having a position detection function, a direction correction function, and the like is required, which raises a problem that the price of the apparatus naturally increases.
[0013]
Further, since the buried pipe 117 follows immediately after the leading conductor 119, every time one buried pipe is propelled, connection work of power hoses and cables to be supplied to the leading conductor 107 occurs. However, since it is difficult to mechanize, it is impossible to speed up the work. Therefore, considering the entire construction period, there is a problem that the speed is not necessarily faster than the two-step method.
[0014]
Further, in the case of propelling the above-mentioned buried pipe 117 having a diameter of about 350 mm or more, the method using the two-step excavation method requires two propulsion steps, but the functions can be shared between the first step and the second step. In order to do so, a simple device configuration is possible for each. In addition, the first process can be easily mechanized because it is possible to develop a unique primary propulsion pipe, and therefore the speed is often faster than the one-process excavation method depending on the conditions when considering the entire construction period.
[0015]
However, since the static press-fitting method is used in the first process, there is a problem that the leading conductor 107 and the primary propulsion pipe must be of a small diameter of less than φ100 mm in order to cope with hard soil. It was. For this reason, the position detection function and the direction correction function mounted on the leading conductor 107 are limited to simple ones. As a result, there is a problem that most of the curves cannot be promoted.
[0016]
Further, in any one of the above-described one-step excavation method and two-step excavation method, since the excavation method includes the excavation and soil removal process, the propulsion speed itself is slower than the press-fitting method. As a result, the construction period becomes longer and the propulsion cost becomes higher, and at the same time, a large amount of excavated earth and sand, which is industrial waste, is discharged.
[0017]
The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a large-diameter buried pipe that is possible only by the conventional excavation method, despite the non-exhaust soil press-in method. It enables fast and promotion and to provide a radially enlarged propulsion device obtained Ru aims to reduce construction time and propulsion costs.
[0020]
[Means for Solving the Problems]
In order to achieve the above object, the diameter expansion propulsion device of the present invention according to claim 1 includes a first connection portion connected to a primary propulsion pipe embedded in advance in a first step with a smaller pipe diameter than the buried pipe, and the primary A diameter-enlarged portion provided in the first connecting portion that can vibrate without giving vibration to the propulsion tube, a vibration mechanism that vibrates the diameter-expanded portion in the front-rear direction parallel to the propulsion direction, and generates vibration in the vibration mechanism A vibration generating device, a second connecting portion connected to a buried pipe buried behind, and a control device for controlling the vibration generating device to vibrate the enlarged diameter portion with a predetermined vibration acceleration. It is characterized by.
[0021]
Therefore, the enlarged diameter portion is vibrated in the front-rear direction parallel to the propulsion direction by the vibration mechanism without giving vibration to the primary propulsion pipe, so that the ground on the front surface of the enlarged diameter portion is fluidized and the front resistance during diameter expansion propulsion is increased. Therefore, the buried pipe is laid down while the diameter expansion propulsion device easily promotes and the diameter is increased.
[0022]
The diameter expansion propulsion device of the present invention according to claim 2 is the diameter expansion propulsion device according to claim 1 , wherein the vibration mechanism is a piston portion that moves the diameter expansion portion back and forth parallel to the propulsion direction, and A vibration generator is a fluid pressure cylinder that vibrates the piston part, or a rotational drive means that vibrates the piston part via a rotational direction converter that converts the rotational direction into a back-and-forth reciprocating motion, or the piston part in the longitudinal direction. And a rotation driving means provided with an eccentric weight for applying vibration to the swinging means for swinging.
[0023]
Accordingly, the piston portion moves back and forth in parallel with the propulsion direction by the vibration wave applied to the fluid pressure cylinder, and the diameter expanding head vibrates in the propulsion direction. Alternatively, the rotation of the rotation driving means is converted into a back-and-forth reciprocating motion through a rotation direction conversion device, and the piston portion moves back and forth in parallel with the propulsion direction, and the diameter expanding head vibrates in the propulsion direction. Alternatively, vibration is generated when the eccentric weight is rotated by the rotation driving means, and this vibration is converted into the propulsion direction by the swinging means, and the piston portion is moved back and forth in parallel with the propulsion direction, and the diameter expanding head vibrates in the propulsion direction. To do.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0025]
The dynamic diameter expansion propulsion method according to this embodiment is a non-exhaust soil propulsion method for a buried pipe having a diameter of 350 mm or more or about 450 mm in a hard soil ground having an N value of about 30 using a dynamic press-fitting method. It is a two-step dynamic diameter expansion propulsion method that can be embedded in
[0026]
Referring to FIGS. 1A and 1B, in this two-step dynamic diameter expansion propulsion method, a start shaft 1 and a reaching shaft 3 are first formed on the ground, and the start shaft 1 is composed of a propulsion jack or the like. A pushing device 5 is installed. As the first step, as shown in FIG. 1A, the tip conductor 7 propelled by using the main pushing device 5 has an outer diameter of about φ350 mm, for example. A dynamic mechanism 9 such as a vibration mechanism is mounted. Immediately after the leading conductor 7 by the dynamic press-fitting method that vibrates by the dynamic mechanism 9, the primary propulsion pipe 11 continuously follows and is buried in a section to be buried up to the reaching shaft 3.
[0027]
As the second step, as shown in FIG. 1 (B), the diameter expansion propulsion device 13 adopting the dynamic press-fitting method that constitutes the main part of the embodiment of the present invention using the main pushing device 5. Is used as the secondary leading conductor, and is propelled while pushing out the primary propulsion pipe 11 embedded in the first step. Following this diameter expansion propulsion device 13, the buried pipe 15 is propelled and replaced with the primary propulsion pipe 11.
[0028]
The diameter expansion propulsion device 13 according to the present invention is characterized in that a vibration mechanism that generates vibration in the front-rear direction parallel to the propulsion direction is mounted as a dynamic method.
[0029]
Referring to FIG. 2, as the diameter expansion propulsion device 17 of the first embodiment, a first connection portion 19 connected to the primary propulsion pipe 11 embedded in the first step is provided, and this first connection portion. In FIG. 19, for example, a diameter expansion head 21 (vibration head) as a diameter expansion portion is provided so as to vibrate in the front-rear direction parallel to the propulsion direction by a vibration mechanism. Further, a second connection portion 23 is provided at the rear portion of the diameter expansion propulsion device 17 so as to connect to the buried pipe 15 buried behind.
[0030]
As the vibration mechanism, for example, a push portion 25 for pressing the primary propulsion pipe 11 to be pushed forward is extended in the front portion of the diameter expansion propulsion device 17, and the periphery of the push portion 25 is guided. The diameter expanding head 21 is provided so as to vibrate in the front-rear direction. Therefore, the vibration portion is only the diameter expansion head 21 and has a structure in which vibration is not transmitted to the front primary propulsion pipe 11 and the subsequent buried pipe 15.
[0031]
Further, for example, a hydraulic cylinder 27 as a vibration generating device for generating vibration in the above-mentioned diameter expansion head 21 is provided inside the diameter expansion propulsion device 17, and this hydraulic cylinder 27 is arranged in parallel with the propulsion direction and is A piston portion 31 including a plurality of piston rods 29 that can move is provided. The diameter expanding head 21 is rigidly connected to the tips of the plurality of piston rods 29. The hydraulic cylinder 27 has a mechanism in which the piston portion 31 of the hydraulic cylinder 27 vibrates in the propulsion direction when a vibration wave is applied to the hydraulic pressure.
[0032]
Further, the diameter expansion propulsion device 17 is provided with, for example, a hydraulic control device 35 as a control device 33 for controlling the vibration wave of the hydraulic pressure of the hydraulic cylinder 27 so as to vibrate the diameter expansion head 21 with a predetermined vibration acceleration. It has been.
[0033]
Therefore, the diameter expansion head 21 vibrates in the propulsion direction via the plurality of piston rods 29 of the piston portion 31 that is actuated by the vibration wave applied to the hydraulic pressure of the hydraulic cylinder 27.
[0034]
Referring to FIG. 3, as the diameter expansion propulsion device 37 of the second embodiment, the first connection part 19, the diameter expansion head 21, the pushing part 25, and the second connection part 23 are the same as those in the first embodiment. This is the same as the diameter expansion propulsion device 17 of the form.
[0035]
Further, as the vibration mechanism, a piston portion 41 including a plurality of piston rods 39 arranged in parallel to the propulsion direction and capable of moving back and forth is provided at the front portion of the diameter expansion propulsion device 37, and the plurality of piston rods 39 described above. The diameter-expanding head 21 is rigidly connected to the tip of the head. Further, for example, an electric motor 43 (or a hydraulic motor) as a rotation driving means is provided as a vibration generating device, and for example, a gear as a rotation direction conversion device that converts the rotation of the electric motor 43 into a back-and-forth reciprocating motion parallel to the propulsion direction. A mechanism 45 is provided, and vibration transmission means 47 for transmitting the back-and-forth reciprocating motion converted by the gear mechanism 45 to the piston portion 41 is provided.
[0036]
Therefore, the rotation of the electric motor 43 (or hydraulic motor) is converted into a back-and-forth reciprocating motion by the gear mechanism 45, and this back-and-forth reciprocating motion is transmitted by the vibration transmitting means 47 and the diameter expanding head 21 is moved in the propulsion direction via the piston portion 41. It will vibrate.
[0037]
Referring to FIG. 4, as the diameter expansion propulsion device 49 of the third embodiment, the first connection part 19, the diameter expansion head 21, the pushing part 25, and the second connection part 23 are the same as those in the first embodiment described above. This is the same as the diameter expansion propulsion device 17 of the form.
[0038]
Moreover, as a vibration mechanism, the piston part 53 provided with the some piston rod 51 which is arrange | positioned in parallel with the propulsion direction and can move back and forth is provided in the front part of the diameter expansion propulsion device 49, and the plurality of piston rods 51 described above. The diameter-expanding head 21 is rigidly connected to the tip of the head. Further, the rear end surface of the piston portion 53 and the rear portion of the diameter expansion propulsion device 49 are connected by, for example, a spring 55 as swinging means for swinging the piston portion 53 in the front-rear direction. Further, the piston portion 53 is provided with, for example, an electric motor 57 (or a hydraulic motor) as a rotational drive means as a vibration generating device, and an eccentric weight 59 is attached to the rotational drive shaft of the electric motor 57.
[0039]
Accordingly, the eccentric weight 59 is rotated by the electric motor 57 (or hydraulic motor), and vibration is generated. This vibration is converted into the propulsion direction by the spring 55, so that the diameter expansion head 21 is propelled through the piston portion 53. Will vibrate in the direction.
[0040]
Referring to FIG. 5, the control device 33 will be described in more detail.
[0041]
In the dynamic press-fitting propulsion method according to the present invention, the diameter expansion propulsion device 13 is provided with a detection unit 61 projecting rearward of the diameter expansion head 21, and a displacement meter 63 for measuring the displacement of the detection unit 61 and the detection unit 61. Sensors such as an accelerometer 67 and a load converter 65 that converts the load of the motor into an electric signal are built in. The detection data from these sensors is input to the operation panel 71 through the calculator 69 and the measurement result is monitored. 73. Further, a control signal for the diameter expansion head 21 is also transmitted from the operation operation panel 71 to the diameter expansion propulsion device 13 via the calculator 69.
[0042]
Based on information from the sensor mounted in the diameter expansion propulsion device 13, the operator of the diameter expansion propulsion device 13 can monitor the front resistance force, vibration force, vibration frequency, acceleration, amplitude, etc. of the diameter expansion head 21 on the monitor 73 in real time. It is possible to monitor, and it is possible to perform optimum vibration control that minimizes the front low drag of the diameter-expanding head 21 according to the ground condition. Specifically, the operator can perform vibration control that gives vibration acceleration at a natural frequency corresponding to the ground to the ground and increases the vibration force to maximize the amplitude.
[0043]
With the above configuration, the front surface resistance of the diameter expansion propulsion device 13 is fluidized when the diameter expansion propulsion device 13 vibrates in the front-rear direction parallel to the propulsion direction as a secondary leading conductor. Is reduced. More specifically, vibration acceleration occurs in the front ground due to the vibration in the front-rear direction described above, and as a result, the shear resistance of the ground is greatly reduced, so the front resistance is about 30% compared to the static press-fitting method. A reduction effect is obtained. Therefore, the buried pipe 15 is laid afterward while the diameter expansion propulsion device 13 easily promotes and enlarges the diameter.
[0044]
Specifically, for example, when a buried pipe 15 having a pipe diameter of about φ450 mm is propelled, the maximum excavation outer diameter is about φ500 mm, but by using a leading conductor 7 of about φ350 mm in the first step, The penetration area of the first step and the second step, that is, the front resistance is almost the same, and the specifications of the vibration mechanism may be the same. In other words, effective propulsion is possible with the minimum necessary equipment capacity.
[0045]
Also, in the first step, curve construction is easy because propulsion is performed with a high-performance tip conductor 7 having a diameter of about 350 mm instead of a simple tip conductor having a small diameter as in the conventional two-step method. Thus, there are no drawbacks that are limited to linear construction as in the conventional two-step method.
[0046]
Furthermore, since both the first process and the second process are dynamic press-fitting methods, propulsion can be performed at a very high speed as compared with the conventional method in which the excavation method is interposed, and the construction period can be shortened and the propulsion cost can be reduced. Furthermore, the excavated sediment can be minimized, which can greatly contribute to the protection of the natural environment.
[0047]
As described above, in the hard soil ground up to N value of about 30, the buried pipe 15 with a pipe diameter of about 450 mm, which could not be promoted without the use of the excavation method in the past, is injected without drainage. It can be propelled by the dynamic press-fitting method. Therefore, since it is an earth-free construction method, construction can be carried out at a very high speed, so that the construction period can be reduced and the propulsion cost can be reduced. In addition, the generation of soil, which is industrial waste, can be suppressed, which can greatly contribute to the protection of the natural environment.
[0048]
In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change.
[0050]
【The invention's effect】
As can be understood from the description of the embodiments of the invention as described above, according to the invention of claim 1 , the enlarged diameter portion is made parallel to the propulsion direction by the vibration mechanism without applying vibration to the primary propulsion pipe. Therefore, it is possible to reduce the front resistance during diameter expansion propulsion by fluidizing the ground on the front surface of the diameter expansion portion. Therefore, it is possible to lay the buried pipe after the diameter expansion propulsion device while easily propelling the diameter expansion propulsion device.
[0051]
According to the second aspect of the present invention, the piston head can be moved back and forth in parallel with the propulsion direction by the vibration wave applied to the fluid pressure cylinder to vibrate the diameter expansion head in the propulsion direction. Alternatively, the rotation of the rotation driving means can be converted into a back-and-forth reciprocating motion via a rotation direction conversion device, and the piston portion can be moved back and forth in parallel with the propulsion direction to vibrate the diameter expanding head in the propulsion direction. Alternatively, vibration can be generated by rotating the eccentric weight with the rotation drive means, and by converting this vibration into the propulsion direction by the swing means, the piston portion can be moved back and forth in parallel with the propulsion direction to move the enlarged head in the propulsion direction. Can vibrate.
[Brief description of the drawings]
FIGS. 1A and 1B show a dynamic diameter expansion propulsion method according to an embodiment of the present invention, in which FIG. 1A is a first step propulsion method and FIG. 1B is a schematic explanatory diagram of a second step propulsion method. .
FIG. 2 is a schematic explanatory view of a diameter expansion propulsion device according to a first embodiment of the present invention.
FIG. 3 is a schematic explanatory view of a diameter expansion propulsion device according to a second embodiment of the present invention.
FIG. 4 is a schematic explanatory view of a diameter expansion propulsion device according to a third embodiment of the present invention.
FIG. 5 is a control system diagram of the control device according to the embodiment of the present invention.
FIG. 6 is a schematic explanatory diagram of a conventional one-step propulsion method.
FIGS. 7A and 7B show a conventional two-step propulsion method, in which FIG. 7A is a schematic diagram of the first step and FIG. 7B is a schematic explanatory diagram of the second step.
FIG. 8 is a schematic explanatory view of a conventional excavation method, showing a conventional propellant propulsion method.
FIG. 9 is a schematic explanatory diagram of a static press-fitting method, showing a conventional propellant propulsion method.
FIG. 10 is a schematic explanatory diagram of a dynamic press-fitting method, showing a conventional propellant propulsion method.
11A and 11B show a conventional two-step propulsion method, where FIG. 11A is a static press-fitting propulsion method in the first step, and FIG. 11B is a schematic explanation of a second-step excavation method. FIG.
[Explanation of symbols]
7 Lead conductor 9 Dynamic mechanism 11 Primary propulsion pipe 13 Diameter expansion propulsion apparatus 15 Embedded pipe 17, 37, 49 Diameter expansion propulsion apparatus (of the first, second and third embodiments)
19 1st connection part 21 Diameter expansion head (diameter expansion part)
23 2nd connection part 27 Hydraulic cylinder (vibration generator)
31, 41, 53 Piston part (vibration mechanism)
33 Controller 43 Electric motor (rotation drive means; vibration generator)
45 Gear mechanism (rotation direction converter)
55 Spring (oscillating means; vibration mechanism)
57 Electric motor (rotation drive means; vibration generator)
59 Eccentric weight (vibration mechanism)

Claims (2)

  A first connection portion connected to the primary propulsion pipe embedded in the first step with a pipe diameter smaller than that of the buried pipe in advance, and an expansion provided in the first connection portion so as to be able to vibrate without giving vibration to the primary propulsion pipe. A diameter portion, a vibration mechanism that vibrates the enlarged diameter portion in the front-rear direction parallel to the propulsion direction, a vibration generator that generates vibration in the vibration mechanism, and a second connection portion that is connected to a buried pipe that is buried behind And a control device for controlling the vibration generating device to vibrate the enlarged diameter portion at a predetermined vibration acceleration. The vibration mechanism is a piston part that moves the enlarged diameter part back and forth in parallel with the propulsion direction, and the vibration generator converts a fluid pressure cylinder that vibrates the piston part or a rotational direction into a back and forth reciprocating motion. Rotation drive means that vibrates the piston part via a rotation direction conversion device, or rotation drive means that includes an eccentric weight that applies vibration to the rocking means that rocks the piston part in the front-rear direction. The diameter expansion propulsion device according to claim 1 .

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