JP2003269081A - Main push device and method for installing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a main push device and a method for installing the same, which can facilitate work for carrying the main push device into a starting shaft and installing the main push device in the starting shaft. <P>SOLUTION: The main push device for pressing an excavator and a buried pipe body, following the excavator, into ground is equipped with: jacks 5 and 5; a reaction receiving member 1A for receiving reaction of the jacks 5 and 5; and a base frame 1 is composed of a first frame 1a for supporting the member 1A, a second frame 1b which is coupled to the first frame 1a so as to be capable of advancing/retreating in the telescopic direction of the jacks 5 and 5, and a third frame 1c which is to be inserted, in a sandwiched state, into a gap produced when the second frame 1b is separated from the first frame 1a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruding device for press-fitting an excavator or a buried pipe into the ground from inside a starting shaft and a method of installing the extruding device.

[0002]

2. Description of the Related Art There is a so-called pipe propulsion method as one of the methods for burying a pipe having a relatively small diameter (for example, 600 mm or less) such as an underground cable or a sewer pipe in the ground. This pipe propulsion method is to push the excavator and the buried pipes that are successively connected to the excavator into the ground from the starting shaft, and to push it into the ground. The buried pipe body of (1) forms a continuous buried pipe line. Then, the former pushing device pushes the excavator and the buried pipe body following the excavator from the start vertical shaft to propel them. An example of this original pushing device is Japanese Patent Laid-Open No. 2001-2001.
A large number of them have already been proposed, such as the one described in Japanese Patent Laid-Open No. 20069-2690.

Here, when the original pushing device is installed, it is common to use a crane or the like to hang the original pushing device in the starting shaft. However, in many cases pipelines laid by the pipe propulsion method are laid under general roads, and considering the influence on the surrounding traffic during the laying work, it is preferable that the starting shaft and the reaching shaft be as small as possible. . Against this background, in recent years, the diameter of the starting shaft has been reduced as much as possible by the use of a press-fitting type circular liner, etc., and as a result, the work of hanging the former pushing device into the starting shaft becomes extremely troublesome. Was there.

On the other hand, in the conventional extruding device,
Generally, the base frame is disassembled in the longitudinal direction in advance, and the base frames are separately loaded into the starting shaft, and then the base frames are connected by bolts or the like in the starting shaft and installed.

[0005]

However, in the above-mentioned prior art, when the base frames are connected, the divided base frames are fastened together with bolts or the like.
It is necessary to align the positions of the bolt holes with each other while suspending one or both base frames with a crane or the like in the starting shaft. Such alignment work is not performed by a single worker, but is usually performed by a worker in a shaft and a crane operator on the ground. Therefore, it is a work that requires accuracy of instructions from workers in the vertical shaft, skilled crane operating skills, and communication between workers.

Further, since the base frame of the former pushing device is fixed to the side wall in the vertical shaft during installation, it is as long as possible with respect to the inner diameter of the vertical shaft so that both ends in the longitudinal direction are close to the inner wall of the vertical shaft. Has been formed. That is, there is not much space between the base frame and the inner wall of the vertical shaft, and the space in the vertical shaft is very narrow as a space for installing the base frame. When dividing the base frame and carrying it into the shaft, the worker
The later-loaded base frame must be carefully hung in the space narrowed by the other base frame already loaded. At this time, it is also necessary to bring the previously loaded base frame closer to the inner wall of the vertical shaft in advance so that a space for the base frame to be hung down later can be secured. Such delicate position adjustment work is a laborious and time-consuming task in a narrow vertical shaft.

The present invention has been made in view of the above matters, and an object of the present invention is to provide an original pusher device and a method of installing the original pusher device, which can easily carry in and install the starter shaft. .

[0008]

(1) In order to achieve the above object, the present invention provides an extruding device provided in a starting shaft for press-fitting an excavator and a buried pipe body following the excavator into the ground. In, a plurality of jacks, a reaction force receiving member that receives reaction force of the plurality of jacks, a first frame that supports the reaction force receiving member, and a retractable direction of the jack with respect to the first frame A second frame connected to
And a base frame composed of a third frame which is inserted into a gap generated when the second frame is separated from the first frame.

According to the present invention, since the second frame constituting the base frame can move forward and backward with respect to the first frame, the third frame is removed and the first and second frames are brought into contact with each other. With this state, the original pushing device can be hung in the starting shaft with the entire length reduced. As a result, it can be easily and smoothly hung, and the work load on the crane operator can be greatly reduced. Further, thereafter, a space for inserting the remaining base frame (third frame) can be easily secured by moving the second frame and separating it from the first frame. Therefore, the position of the base frame that has been suspended first is not finely adjusted in advance for the base frame that will be suspended later, and the cumbersome work of bringing it closer to the shaft inner wall is not involved. Furthermore,
The advancing / retreating operation of the second frame is guided by the guide means, and even after the second frame is separated from the first frame, the axial direction of the first frame is not displaced,
The bolt holes can be easily aligned with the third frame. As described above, according to the former pushing device of the present invention, it is possible to easily carry in and set up the starting shaft.

(2) In the above (1), preferably,
Gap adjusting means is provided which connects the first and second frames and adjusts the size of the gap between the first and second frames.

(3) In the above (1) or (2), and preferably, a guide means is provided for guiding the forward / backward movement of the second frame with respect to the first frame.

(4) Any one of the above (1) to (3)
In one of the above, preferably, the protrusion provided on the upper portion of the third frame so as to protrude from the end surface facing the first and second frames, and the first and second protrusions fitted to the protrusion. And a recess provided in the upper part of the frame.

(5) In the above (4), more preferably, at least a part of the fitting surfaces of the protrusion and the recess is
The taper surface or the R surface is used.

(6) Any one of the above (1) to (5)
In one of the above, preferably, a taper surface or an R surface whose diameter is reduced downward is provided at the lower part of the end surface of the third frame facing the first and second frames.

(7) In order to achieve the above object, the method for installing the original pushing device according to the present invention is the method for installing the original pushing device, in which an excavator and a buried pipe body following the excavator are pressed into the ground and propelled. In a state where the first and second frames forming the base frame are substantially in contact with each other, the original pushing device is suspended in the starting vertical shaft, and then the second frame is advanced to the first frame. A gap is created between them, and a third frame is inserted into the created gap and fastened to the first and second frames.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an extruding device of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing the overall configuration of a small-diameter excavation system that performs a pipe propulsion method using the original pushing device of the present invention. In FIG. 1, D is a starting shaft, and in the pipe propulsion method, buried pipes are sequentially laid while excavating from the starting shaft D toward a reaching shaft (not shown) along a planned route. . Reference numeral 100 denotes an excavator for excavating the natural ground, 100a denotes a rotary excavator attached to the front portion (left side in FIG. 1) of the excavator 100, and the outer diameter of the rotary excavator 100a is the outer diameter of the excavator 100. Is equal to or larger than. 200 is a machine 10
An embedded pipe body (for example, a fume pipe) that sequentially follows 0 to form a wall surface of the tunnel, and the outer diameter of the embedded pipe body 200 is smaller than that of the machine 100 and the rotary excavator 100a. The buried pipe body 200 is sequentially loaded into the starting shaft D by, for example, a crane, and is connected to the tail end of the buried pipe body 200 following the excavator 100 there.

That is, at the time of construction, the buried pipe 2 at the tail end
By pressing 00 from inside the starting shaft D, propulsive force is applied to the leading excavator 100, and the excavator 100 excavates the ground while excavating the natural ground by the rotary excavator 100a. In the pipe propulsion method, by repeating these operations in sequence and digging toward the reaching shaft,
Between the starting shaft D and the reaching shaft, a continuous pipe line by the buried pipe body 200 is laid. Further, the earth and sand excavated by the rotary excavator 100a passes through a earth and sand passage (not shown) provided on the outer periphery of the excavator 100, and the excavator 10
0 Excavator 1 from the sediment intake (not shown) installed at the rear
It is taken in into 00. Then, the subsequent buried pipe body 20
Ejection pipe 25 that has been sequentially installed with 0 through it
0, and is pumped to the starting shaft D side by the earth and sand pump (not shown) provided in the excavator 100.

Then, in such a pipe propulsion method, one that pushes the buried pipe body 200 (or the excavator 100) from inside the starting stand D and propels the leading excavator 100 and the buried pipe body 200 following it. This is the original pushing device 300. Figure 2
2 is a top view showing the entire configuration of the original pushing device 300 of the present embodiment, FIG. 3 is a side view thereof, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2, and FIG. It is a figure. However, FIG. 5 shows a state in which a bearing wall 2a described later is removed. In these FIGS. 2 to 5, reference numeral 1 is an original pushing device 300.
The base frame of the base frame 1 is
It is composed of the third frames 1a to 1c. The second frame 1b is connected to the first frame 1a so as to be able to move back and forth in the extension / contraction direction (left and right direction in FIG. 1) of a jack 5 (described later). The third frame 1c is sandwiched in the gap generated when the second frame 1b is separated from the first frame 1a. 1A is a reaction force receiving member of a jack 5 (described later), and this reaction force receiving member 1A is the first frame 1
It is supported by a so as to be almost vertical.

Reference numerals 2a and 2b are bearing walls for fixing the base frame 1 in the starting shaft D. These bearing walls 2a and 2b are
As shown in FIG. 2, it is formed in a substantially arcuate shape along the inner wall surface of the launch stand D. A plurality of screw jacks (cylinders may be provided) 3 for advancing and retracting the bearing walls 2a and 2b with respect to the base frame 1 are provided.
The a and 2b are attached to the second frame 1b and the reaction force receiving member 1A via the screw jacks 3, respectively, and are configured to be able to move forward and backward in the longitudinal direction of the base frame 1 (left and right direction in FIG. 1). . That is, the bearing walls 2a, 2b
Is pushed against the inner wall of the starting shaft D by the extension operation of the screw jack 3, and this pushing force fixes the former pushing device 300 at the operating position. Reference numeral 4 is a level jack provided on the base frame 1 (see FIG. 2).
The level jack 4 has its threaded portion screwed to the lower part of the base frame 1, and the level of the base frame 1 is adjusted by adjusting the protruding length from each base frame 1. is there. As the level jack 4, a hydraulic cylinder or the like may be used instead of the screw type.

Reference numeral 5 denotes a plurality of hydraulically driven jacks (two in this example) for propelling the excavator and the subsequent buried pipe body. These jacks 5 and 5 are substantially parallel to each other and horizontally above the base frame 1. Therefore, it is swingably supported by the reaction force receiver 1A. Reference numeral 6 denotes a plate-shaped push ring attached to the jacks 5. The push ring 6 is adapted to be inserted into an insertion opening (not shown) and to be locked to the jack 5 by a cotter 11 and a flange portion 5b which will be described later. (Details will be described later). The push wheel 6 contacts the rear end surface of the buried pipe body 200 (or the excavator 100) during propulsion to transmit the thrust force of the jack 5.

Reference numeral 7 denotes a support roller (see FIG. 5) attached to the push wheel 6, and the jack 5 is supported by the support roller 7 and the reaction force receiving member 1A. Reference numeral 8 denotes a truck for the push wheel 6 to travel as the jack 5 expands and contracts, 9 denotes rails of the truck, and the rails 9 continuously connect rails 9a to 9c laid above the frames 1a to 1c, respectively. It is arranged in a straight line. Also, each rail 9a-
9c are fixed to the upper portions of the frames 1a to 1c via plates 10a to 10c, respectively.

Reference numeral 12 denotes a guide roller for supporting the above-mentioned buried pipe body 200 (or the excavator 100) set at the time of propulsion. The guide roller 12 is the second roller of the base frame 1.
It is attached to the frame 1b. In FIG. 5, 1
Reference numeral 3 is a support plate for the guide roller 12, 14 is a screw piece provided at both ends of the support plate, and 15 is a screw screwed to the screw piece 14. This screw 15 is used for the second frame 1b.
It is rotatably provided with respect to the above, and by rotating this screw 15, the screw top 14 is moved up and down, and the height position of the guide roller 12 can be adjusted.

Although not shown in the figure for the purpose of preventing complexity,
The front surface (the left side surface in FIG. 1) of the push wheel 6 has a pressing member or an embedded pipe body 20 which is a contact surface for the embedded pipe body 200 to be set.
A plurality of pins or the like for holding the rear end portion of 0 are attached and detached according to the diameter of the embedded pipe body 200. That is, the embedded pipe body 200 has a front end portion connected to the preceding embedded pipe body 200, and a rear end portion supported by a pin or the like provided on the push ring 6, and by the extension operation of the jack 5, an intermediate portion is formed. The portion is supported by the guide roller 12 and pressed into the ground.

Further, at this time, 5a is a groove portion provided in the jack 5, and this groove portion 5a is provided in the vicinity of the end of the jack tube on the extension direction side (left side in FIG. 2) of the cylinder tube, and the cotter 11 can be attached thereto. It has become. Reference numeral 5b denotes a flange portion provided on the jack 5, and the flange portion 5b is provided near the end of the cylinder tube of the jack 5 in the retracted direction (right side in FIG. 2). As a result, when the push wheel 6 is positioned on the front side (left side in FIG. 2) of the groove portion 5a and the cotter 11 is fitted in the groove portion 5a, the push wheel 6 is pushed by the cotter 11 and near the tip portion of the jack 5. Propel with it locked in position. On the other hand, when the cotter 11 is removed from the groove portion 5a, the push wheel 6 is pushed by the flange portion 5b and is propelled in a state of being locked at a position near the rear end portion of the jack 5. Therefore, the push wheel 6 can be selectively fixed to the position on the groove 5a or the flange 5b side of the jack 5,
The jack 5 is capable of propelling the excavator 100, the buried pipe body 200, and the like for a distance of nearly two strokes. In other words, this configuration enables the use of a relatively small jack 5 having a stroke about half that of the buried pipe body 200,
This contributes to downsizing of the device.

Reference numeral 16 is a stopper attached to the tip of the jack 5 with a bolt or the like, and this stopper 16 prevents the push ring 6 from coming off the jack 5. Further, 17 is a discharge pipe for excavated earth and sand, and this discharge pipe 17 is connected to the above-mentioned discharge pipe body 250 that has been sequentially passed through the buried pipe body 200 together with the buried pipe body 200, and the excavated soil sent under pressure is connected. It is to be discharged through.

In the original pushing device having the above-mentioned structure, the most characteristic feature of this embodiment is the structure of the base frame 1. As described above, the second frame 1b is provided so as to be movable back and forth with respect to the first frame 1a, and the third frame 1c is detachably provided between the first and second frames 1a, 1b. . Here, 20 is the first and second
Gap adjusting means (see FIG. 2) for adjusting the gap size between the frames 1a and 1b.
Also, the second frames 1a and 1b are connected. Reference numeral 30 is a guide means (see FIG. 3) that guides the forward / backward movement of the second frame 1b with respect to the first frame 1a. The second frame 1b is guided by the guide means 30 and is moved forward and backward with respect to the first frame 1a by the gap adjusting means 20.

6 (a) and 6 (b) are shown in FIG.
A view showing the lower side of the former pushing device 300 seen from the middle VI-VI arrow,
This shows a state in which the third frame 1c is removed. As shown in FIGS. 6A and 6B, the gap adjusting means 20 includes a support 21 attached to the beam 1ba of the second frame 1b by, for example, welding, and the first frame 1
Boss 22 attached to beam 1aa of a by bolts or the like
And the boss 2 while being rotatably supported by the support 21.
2 and a threaded rod 23 screwed together.

7 (a) to 7 (c) are diagrams showing the detailed structure of the gap adjusting means 20, and FIG. 7 (c) is shown in FIG.
Fig. 7 (c) is an enlarged view of part VII in Fig. 7 (a).
FIG. 7 (b) is a front view seen from the left side in FIG. 7 (c). 7A to 7
As shown in (c), the support 21 includes the beam 1b.
It is composed of a mounting plate 21a for a, gripping plates 21b, 21c for gripping the screw rod 23, and a rib 21d for securing the mounting strength of the mounting plate 21a to the beam 1ba. Reference numeral 21e is a spacer provided between the grip plates 21b and 21c.
Are fastened together by bolts 21f with the spacer 21e interposed therebetween and a gap therebetween. 21ba and 21ca are through holes formed in the grip plates 21b and 21c.

Reference numeral 23a is a contact plate attached to the tip of the screw rod 23, and the contact plate 23a is sandwiched by nuts 23b and 23c attached to the screw rod 23. Nut 23
Although b and 23c are smaller than the through holes 21ba and 21ca, the sandwiched contact plate 23a has a through hole 21b.
The diameter of the screw rod 2 is larger than that of the a and 21ca, and the contact plate 23a is located between the gripping members 21b and 21c.
3 is rotatably attached to the support 21.

8 (a) and 8 (b) are shown in FIG. 6 (a).
VIII-VIII sectional view of the base frame 1 seen in section, FIG.
FIG. 9 is an enlarged view of a portion IX in FIG. The guide means 3
0 is, as shown in FIGS. 8 (a), 8 (b) and 9,
The bracket 31 fixed to the second frame 1b side, and the guide rod 3 press-fitted and gripped by the bracket 31
2 and a guide 33 that is bolted (welded or the like) to the first frame 1a side. As shown in FIG. 9, the guide 33 includes a housing 33a fixed to the first frame 1a, a bush 33b inserted into the housing 33a and axially slidably inserted through a guide rod 32, and a bush 33b. It is composed of a stopper 33c for retaining 33b in the housing 33a.

The first and second frames 1a and 1b are connected by the above connecting structure, and the screw rod 23 of the gap adjusting means 20 is provided at its free end (right end in FIG. 6A). By gripping the gripping portion 23d with a tool such as a pipe wrench and rotating the gripping portion 23d, the support 21 provided at the tip end together with the screw rod 23 moves forward and backward with respect to the boss 22. As a result, the second frame 1b is moved in the extension / contraction direction of the jack 5 with respect to the first frame 1a while being guided by the guide means 30.

That is, in FIG. 6A, the third frame 1c
The second frame 1b is removed so that the second frame 1b is substantially in contact with the first frame 1a. In this state, by operating the gap adjusting means 20, as shown in FIG. The frame 1b can be separated from the first frame 1a. Of course, conversely to this, by operating the gap adjusting means 20, as shown in FIG.
It is also possible to move the second frame 1b from the state of (b) to the state of FIG. 6 (a). Further, when the original pushing device 300 is lifted by a crane or the like, the moment due to the load of the second frame 1b is received by the guide rod 32 and the screw rod 23 is not loaded. Therefore, it is desirable that the guide rod 32 be made of a material having high bending strength or be formed to have a sufficient diameter.

Further, FIG. 8A is similar to FIG. 6A.
Although the third frame 1c is removed in advance, it is possible to create a gap between the first and second frames 1a and 1b as shown in FIG. The third frame 1c can be inserted. Figure 2
In the state shown in (3), the third frame 1c is thus inserted and fastened between the first and second frames 1a and 1b.

Here, the first to third frames 1a to 1c
Are made of steel material such as H-shaped steel extending in the longitudinal direction of the base frame 1 (horizontal direction in FIG. 8B), and a mounting plate 18 made of a steel plate or the like is welded to each end. Etc. are attached. FIG. 10A is a cross-sectional view of the third frame 1c taken along the line Xa-Xa in FIG. 8B, and FIG. 10B is an end surface of the first frame 1a viewed in the direction of the arrow Xb in FIG. 8B. It is a front view showing. These Figure 1
0 (a) and FIG. 10 (b), the mounting plate 18 at the end of the third frame 1c is provided with a plurality of (four in this example) screw holes 18a for bolt mounting. The mounting plate 18 of the first frame 1a has a plurality of through holes 18b corresponding to the positions of the holes 18a (in this example, 4
One) is provided. That is, the first and third frames 1
The bolts a and 1c are configured so that bolts (not shown) can be attached and fastened to the screw holes 18a from the first frame 1a side through the through holes 18b. The mounting plate 18 of the second frame 1b also has a plurality of (four in this case) through holes 18b similarly to the first frame 1a, and is fastened to the third frame 1c in the same manner as the first frame 1a. Has become.

Further, as described above, the plates 10a to 10 are provided on the first to third frames 1a to 1c, respectively.
Rails 9a to 9c are provided via c. The mounting method is not limited to the following, but for example, each of the plates 10a to 10c includes the first to third frames 1a to 1c.
The rails 9a-9 are fastened to 1c with bolts or the like.
The c is attached to each of the plates 10a to 10c by, for example, welding. At this time, as shown in FIG. 8B, the plate 10c and the rail 9c of the third frame 1c.
Project from the end surface of the third frame 1c (this projecting portion is referred to as a projecting portion 19a). Then, corresponding to this, the plate 10a and the rail 9 of the first frame 1a
The end of a retreats from the end surface of the first frame 1a to the opposite side of the third frame 1c to form a stepped portion (this stepped portion is referred to as a recess 19b). In addition, similarly to this, the ends of the plate 10b of the second frame 1b and the rail 9b are
It retreats from the end surface of the second frame 1b to the side opposite to the third frame 1c, and a recess 19b is formed in this portion.

As a result, in the state of FIG. 8 (b),
The third frame 1 is provided between the first and second frames 1a and 1b.
When c is inserted, the protrusion 19a of the third frame 1c
It fits into the recesses 19b of the first and second frames 1a and 1b to prevent the third frame 1c from falling off. Along with this, the protrusion 19a is fitted into the recess 19b, so that the screw holes 18a and the through holes 18b shown in FIGS. 10A and 10B naturally correspond to each other in the height direction. The screw holes 18a and the through holes 18b are aligned with each other only by shifting the third frame 1c in the width direction (the direction orthogonal to the plane of the paper in FIG. 8B).

Next, the basic operation of the original pushing device 300 having the above structure will be described. First, at the start of press-fitting, the push wheel 6 is locked to the flange portion 5b side of the jack 5, and the excavator 100 is set with the jack 5 fully retracted. Then, the jack 5 is extended and the push wheel 6 presses the excavator 100 into the ground. As a result, the excavator 100 can rotate the excavator 10
While excavating the ground with 0a, the jack 5 advances by one stroke. Then, the push wheel 6 is re-engaged with the groove 5a side of the jack 5 using the cotter 11, and the excavator 100 is advanced by one stroke. Then, the original pushing device 300
Then, the buried pipe body 200 is set, and the excavator 100 is subsequently connected and press-fitted in the same procedure. After that, similarly, the embedded pipe body 200 is set in the original pushing device 300, and the embedded pipe body 2 is set.
The operation of connecting and press-fitting after 00 is sequentially repeated to advance. As a result, the buried pipeline is laid in the ground by the buried pipe body 200 following the excavator 100.

Next, the procedure for installing the original pressing device 300 according to the present embodiment will be described with reference to FIGS. 11 (a) to 11 (c). First, when the former pushing device 300 is loaded into the starting shaft D, as shown in FIG.
Then, the second frame 1b is moved to the first frame 1a side to shorten the total length of the base frame 1. Then, the original pushing device 300 in this state is lifted by a crane or the like installed near the starting shaft D on the ground, and is hung in the starting shaft D.

When the former pushing device 300 reaches the bottom surface of the starting shaft D, the gap adjusting means 20 is operated to separate the second frame 1b from the first frame 1a, as shown in FIG. 11 (b). Then, when a sufficient gap is generated between the first and second frames 1a and 1b, as shown in FIG. 11C, the third frame 1c is hung by a crane or the like, and the first and second frames 1a and 1b are Insert between 1b. At this time,
First and second frames 1a and 1b and third frame 1c
The third frame 1c with a slight gap between
Is fastened to the first and second frames 1a and 1b, a load is applied to the screw rod 23, which may cause bending. Therefore, after inserting the third frame 1c and aligning the bolt holes with the first and second frames 1a and 1b, the gap adjusting means 20 is operated to operate the first to third frames 1.
The second frame 1b is moved to the right side in the drawing so that the a to 1c come into contact with each other. It is preferable to fasten the first to third frames 1a to 1c after performing this procedure.

Finally, the pressure bearing walls 2a and 2b are pushed out, the original pushing device 300 itself is fixed to the inner wall of the starting shaft D, and the installation procedure is completed. However, in the middle of the above procedure,
The direction of the source pushing device 300 is appropriately adjusted so that the extension and contraction direction of the jack 5 matches the desired propulsion direction.

According to the present embodiment described above, FIG.
As shown in (a), since the third frame 1c is removed and the first and second frames 1a and 1b are brought into contact with each other, the former pushing device 300 is suspended in the starting shaft D, so that the base frame 1
Is sufficiently smaller than the diameter of the starting shaft D and can be easily and smoothly hung, and the work load on the crane operator can be greatly reduced. Also, the starting shaft D
A space for inserting the remaining base frame (third frame 1c) after the original pushing device 300 is carried into the can be easily created by operating the gap adjusting means 20, and the previously suspended base frame can be There is no need for the troublesome work of fine-adjusting the position in advance and moving it closer to the inner wall of the shaft for the base frame that will be suspended later.

Furthermore, the first and second frames 1a, 1b
Is guided by the guide means 30 in the advancing / retreating direction, the axial direction does not shift even after the separation, and the bolt holes can be easily aligned with the third frame 1c. Further, at this time, since the third frame 1c finally loaded is relatively small and lightweight, the first and second frames 1a, 1a,
It is easy to adjust the bolt holes with 1b.

The third frame 1c and the first and second frames
Since the third frame 1c and the frames 1a and 1b are fitted to each other by the protrusions 19a and the recesses 19b, the third frame 1c does not fall off, and at this time, the positions of the bolt holes in the height direction match each other. Therefore, also by this, the ease of the base frame connecting work can be improved, and the installation work can be facilitated.

FIG. 1 shows another embodiment of the original pushing device of the present invention.
2 and FIG. 13. FIG. 12 is a side view showing the detailed structure of the base frame of the former pushing device of the present embodiment,
FIG. 13A is a front view of the third frame viewed from the arrow XIIIa direction in FIG. 12, and FIG. 13B is a front view of the first frame viewed from the arrow XIIIb direction in FIG. These Figure 1
2, as shown in FIGS. 13 (a) and 13 (b), the difference between this embodiment and the above-described one embodiment is the first one.
The first and second frames 1a ′ of the third frame 1c ′,
The taper surface is provided below the end surface facing 1b ', and secondly, the protrusion 19a' of the third frame 1c 'and the recesses 19b' of the first and second frames 1a ', 1b' are provided. But,
That is, the taper surface is at least partially fitted.

That is, at the lower part of the mounting plate 18A of the third frame 1c ', there is provided a taper portion 40 which is spaced downward from the first and second frames 1a', 1b '. Further, as shown in FIG.
A taper block 50a is provided at a lower portion of the a ', as viewed from the end surface side (the left and right sides in FIG. 12), the diameter of which is reduced downward. Corresponding to this, the mounting plate 1 is provided in the recesses 19b ′ of the first and second frames 1a ′, 1b ′.
A V-shaped groove portion 50b having a reduced diameter is formed on the upper portion of 8B. These taper block 50a and groove 5
0b are fitted with each other.

That is, in the present embodiment, as shown in FIG. 12, when the third frame 1c 'is inserted between the first and second frames 1a' and 1b ', the tapered portion 40 serves as a guide. Then, the third frame 1c 'is smoothly introduced between the first and second frames 1a' and 1b '. After that, the taper block 50a of the third frame 1c 'is smoothly fitted while being guided by the groove portions 50b of the first and second frames 1a', 1b '.

The tapered surfaces of the tapered portion 40, the tapered block 50a and the groove portion 50b may be R surfaces. Further, the inclination angles of the taper portions of the taper block 50a and the groove portion 50b are substantially the same, and the taper block 50
It is preferable that a is formed to be slightly smaller than the groove 50b in a similar manner. This is because, by doing so, both widthwise end portions of the plate 10c of the third frame 1c 'finally come into contact with the mounting plates 18B of the first and second plates 1a', 1b '. . Other configurations are
This is similar to the above-described embodiment.

Also in the present embodiment, the same effect as that of the above-mentioned one embodiment can be obtained. In addition to this, in this example, the third frame 1c ′ is guided by the tapered portion 40 and smoothly guided between the first and second frames 1a ′ and 1b ′,
The connection workability of the base frame 1'can be further improved. Also, the third frame 1c 'and the first and second frames
The frames 1a ′ and 1b ′ use the respective tapered surfaces (taper block 50a and groove portion 50b) as guides, so that the position of the third frame 1c ′ in the width direction (direction orthogonal to the paper surface in FIG. 12) is It is guided so as to fit the second frames 1a ′ and 1b ′. As a result, the insertion of the third frame 1c 'and the bolt hole alignment can be substantially performed,
Installation work can be made more efficient as compared with the above-described one embodiment.

In each of the above embodiments, the gap adjusting means 20 is a screw type jack with a screw rod 23, but the invention is not limited to this, and instead of the screw rod 23, for example, a hydraulic cylinder or the like. May be used. Also,
Although the guide means 30 is provided on both sides in the width direction of the base frames 1 and 1 ', the present invention is not limited to this. For example, one may be provided on one side, and the mounting position is not limited to the above. For example, it may be provided near the center in the width direction of the base frames 1 and 1 ′. Further, a plurality of gap adjusting means 20 may be provided, or of course, may be provided at other positions such as both sides in the width direction of the base frames 1 and 1 '.

Further, in the above, the push wheel 6 is connected to the jack 5
Although the description has been given by taking as an example a source pushing device having a configuration in which approximately 2 strokes of the jack 5 are press-fitted selectively on the groove portion 5a or the flange portion 5b side, the technical idea of the present invention is The present invention is not limited to the above-mentioned original pressing device, but can be applied to various other original pressing devices. For example, it can be applied to a type that simply press-fits for one stroke, or a type that is expanded and contracted in multiple cuts and has, for example, a jack having a stroke two to three times that of a cylinder tube. The effect of can be obtained.

[0051]

According to the present invention, the second frame is the first
Since the third frame is removed and the first and second frames are brought into contact with each other, the original pushing device can be moved into the starting shaft in a state where the total length is reduced. Can be hung. This allows
It can be hung easily and smoothly, and the work load on the crane operator can be greatly reduced. Further, the space for the third frame to be inserted later can be easily secured by separating the second frame from the first frame. Therefore, the position of the base frame that has been suspended first is not finely adjusted in advance for the base frame that will be suspended later, and the cumbersome work of bringing it closer to the shaft inner wall is not involved. Further, since the forward / backward movement of the second frame is guided by the guide means, the axial direction does not shift even after the second frame is separated from the first frame, and the alignment of the bolt hole with the third frame is easy. it can. As described above, according to the former pushing device of the present invention, it is possible to easily carry in and set up the starting shaft.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the overall configuration of a small-diameter excavation system that performs a pipe propulsion method using the original pushing device of the present invention.

FIG. 2 is a top view showing the overall configuration of an embodiment of the original pushing device of the present invention.

FIG. 3 is a side view showing the overall configuration of an embodiment of the original pushing device of the present invention.

FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2, showing a detailed configuration of an embodiment of the original pressing device of the present invention.

FIG. 5 is a front view showing the overall configuration of an embodiment of the original pushing device of the present invention, as viewed from the left side in FIG. 2.

FIG. 6 is a view taken along the line VI-VI in FIG. 3 showing the lower structure of the base frame of the embodiment of the original pushing device of the present invention, and showing the state in which the third frame is removed.

FIG. 7 is a diagram showing a detailed structure of a gap adjusting means provided in an embodiment of the original pushing device of the present invention.

FIG. 8 is a cross-sectional view of the base frame taken along the line VIII-VIII in FIG. 6A showing the overall configuration of the guide means provided in the embodiment of the original pushing device of the present invention.

FIG. 9 is an enlarged view of a portion IX in FIG. 8A showing a detailed structure of guide means provided in an embodiment of the original pushing device of the present invention.

FIG. 10 is a view showing a detailed structure of a third frame provided in an embodiment of the original pushing device of the present invention, Xa-Xa in FIG. 8B.
FIG. 8 is a cross-sectional view of a cross section, and FIG. 8 showing a detailed structure of a first frame provided in an embodiment of the original pressing device of the present invention.
(B) It is the front view seen from the middle arrow Xb direction.

FIG. 11 is a diagram illustrating an installation procedure in the embodiment of the original pressing device of the present invention.

FIG. 12 is a side view showing a detailed structure of a base frame provided in another embodiment of the original pushing device of the present invention.

FIG. 13 is an arrow XIII in FIG. 12 showing a detailed structure of a third frame provided in another embodiment of the original pushing device of the present invention.
It is the front view seen from the a direction, and the front view seen from the arrow XIIIb direction in FIG. 12 showing the detailed structure of the 1st frame with which other embodiment of the original pusher of this invention was equipped.

[Explanation of symbols]

1 base frame 1'Reaction force receiving member 1a, 1a '1st frame (1st frame) 1b, 1b 'second frame (second frame) 1c, 1c 'Third frame (third frame) 5 jacks 19a, 19a 'protrusion 19b, 19b 'recess 20 Gap adjusting means 30 Guide means 100 machine 200 buried pipe

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsumi Tamura             Hitachi Construction Machinery Co., Ltd.             Ceremony Company Tsuchiura Factory F term (reference) 2D054 AC18 AD32 EA03 EA05

Claims (7)

[Claims] 1. A source pusher provided in a starting shaft for press-fitting an excavator and a buried pipe body following the excavator into a ground, and a plurality of jacks and a reaction force receiver for receiving a reaction force of the plurality of jacks. And a first frame for supporting the reaction force receiving member, the first frame
Second frame connected to the above frame so as to be able to move back and forth in the direction of expansion and contraction of the jack, and a third frame inserted in a gap generated when the second frame is separated from the first frame. An extruding device, comprising: 2. The original pushing device according to claim 1, wherein the first and second frames are connected to each other, and the first and second frames are connected.
The former pushing device is provided with a gap adjusting means for adjusting a gap size between the frames. 3. The original pushing device according to claim 1,
An original pushing device comprising guide means for guiding the forward / backward movement of the second frame with respect to the first frame. 4. The pusher device according to claim 1, further comprising: a protruding portion provided on an upper portion of the third frame so as to protrude from an end surface facing the first and second frames. An original pushing device, characterized in that a recess provided in the upper portions of the first and second frames is provided so as to be fitted to the projecting portion. 5. The original pressing device according to claim 4, wherein at least a part of the fitting surface of the protrusion and the concave portion is a tapered surface or an R surface. 6. The original pushing device according to claim 1, wherein the first and second frames of the third frame are provided.
An original pushing device, characterized in that a taper surface or an R surface whose diameter is reduced downward is provided at the lower part of the end surface facing the frame. 7. A method of installing an extruding device for press-fitting an excavator and a buried pipe body following the excavator into the ground, wherein the first and second frames constituting the base frame are substantially in contact with each other. After suspending the original pushing device in the starting shaft, the second frame is advanced to create a gap with the first frame, and the third frame is inserted into the created gap. A method for installing an original pushing device, characterized by fastening to the first and second frames.