JP4193592B2 - Start / arrival method of propulsion pipe and start / reach section - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the start / reach method of the propulsion pipe and the segment of the start / reach part, for example, when constructing a large section tunnel by the pipe roof method, the propulsion is installed as a mountain stop between the shield holes dug in parallel It is used in the construction of pipes (steel pipes).
[0002]
[Prior art]
As shown in FIG. 10 , for example, as shown in FIG. 10 , the shield (shielding machine) is pushed into the ground and the shield holes 30 and 31 having a circular or rectangular cross section are dug in parallel. A so-called pipe roof method is known in which a plurality of propulsion pipes (steel pipes) 32 are bridged between shield holes 30 and 31 as a middle mountain stop, and the middle part is widened by excavating the inside (for example, a patent) Reference 1, 2, 3).
[0003]
In this construction method, the propulsion pipe 32 is provided with a propulsion device at the tip, and is propelled from one shield hole 30 side to the other shield hole 31 side and installed between the shield holes 30 and 31, and both ends of the propulsion pipe 32 are on the start side. In addition, the shield holes 30 and 31 are penetrated on both the reaching side and the reaching side.
[0004]
In this case, since the segments of the shield holes 30 and 31 cannot be directly cut by the propulsion unit, a part of the segments is removed and holes are provided in the side portions of the shield holes 30 and 31, and the propulsion pipe 32 is provided there. Each end is penetrated.
[0005]
[Patent Document 1]
Japanese Patent Publication No. 6-102955 [Patent Document 2]
Japanese Patent Publication No. 7-76507 [Patent Document 3]
JP-A-7-81486 [0006]
[Problems to be solved by the invention]
For this reason, when constructing the starting and reaching parts of the propulsion pipe, the surrounding earth and sand and groundwater are prevented from flowing into the shield hole even if part of the segment is removed so that the surrounding area can be constructed stably. It was necessary to improve the ground in advance.
[0007]
Conventionally, high-pressure jet agitation and freezing methods have been used for this type of ground improvement. However, since the high-pressure jet agitation method must be performed from the ground, there is a problem that the construction tends to be large-scale. It was.
[0008]
The freezing method can also be applied from the inside of the shield hole. However, especially in the case of viscous land, frost heaving, thawing subsidence, and expansion pressure due to freezing may adversely affect the shield hole segment. In addition, both methods have problems such as an inevitable extension of the construction period and an increase in construction costs.
[0009]
The present invention was made in order to solve the above-mentioned problems, and does not require a particularly large-scale ground improvement, and the propulsion pipe that enables reduction of construction cost, labor saving of construction, shortening of construction period, etc. The purpose is to provide a start / reach method and a start / reach segment.
[0010]
[Means for Solving the Problems]
The starting and reaching method of the propulsion pipe according to claim 1 is provided such that an opening is provided in a segment installed in the starting or reaching part of the propulsion pipe, an outer shell made of a solidifying material is provided in the opening, and the outer shell is provided with the opening. In the start and reach method of the propulsion pipe that projects an entrance pipe and propels the propulsion pipe through the entrance pipe, a cooling pipe is installed inside the entrance pipe, and brine is circulated through the cooling pipe. It is a feature.
[0011]
The invention of the present application has made it possible to penetrate the propulsion pipe through the segment while directly cutting the segment of the shield hole with a propulsion device on the start side or the arrival side of the propulsion pipe, so By omitting ground improvement, it is possible to save labor and reduce construction costs.
[0012]
In this case, the segment installed in the starting or reaching part of the propulsion pipe may be any segment such as a steel shell segment, a composite segment, an RC segment, or a PC segment. Is desirable.
[0013]
For the solidified material, for example, FRP, fiber mortar, or fiber concrete may be used so that cutting with a propulsion device is easy.
[0015]
Also, by passing the propulsion pipe through the entrance pipe attached to the inside of the outer shell, inflow of groundwater and earth and sand flowing into the shield hole from around the propulsion pipe (between the propulsion pipe and the through hole) that penetrates the outer shell Can be prevented. In this case, a normal steel pipe can be used as the entrance pipe.
[0016]
The starting and reaching method for the propulsion pipe according to claim 2 is characterized in that in the starting and reaching method for the propulsion pipe according to claim 1 , a water stop packing is attached to the inside of the entrance pipe.
[0017]
In the present invention, groundwater and earth and sand flowing into the gap between the entrance pipe and the propulsion pipe can be reliably prevented by the water-stopping packing. In this case, inflow of groundwater or earth and sand can be more reliably prevented by attaching a plurality of water-stopping packings at predetermined intervals.
[0018]
The starting and reaching method of the propulsion pipe according to claim 3 is characterized in that, in the starting and reaching method of the propulsion pipe according to claim 1 or 2 , a cooling pipe is attached in a coil shape inside the entrance pipe. .
[0019]
In the present invention, inflow of groundwater and earth and sand can be more reliably prevented by freezing groundwater and earth and sand that particularly flows through the gap between the entrance pipe and the propulsion pipe. In this case, the freezing ability (water stoppage ability) can be increased by appropriately adjusting the length of the coil portion in accordance with the amount of groundwater or earth and sand flowing in.
[0020]
The segment of the start / reach part of the propulsion pipe according to claim 4 is a segment installed in the start part or the reach part of the propulsion pipe, and has an opening at a portion through which the propulsion pipe passes, and the opening A segment cover which is detachably attached to the section, an outer shell made of a solidified material formed on the ground side of the segment cover, an entrance pipe which is attached to the segment cover and through which the propulsion pipe can pass, and the entrance And a cooling pipe attached to the inside of the pipe.
[0021]
The segment of the start / reach part of the propulsion pipe according to claim 5 is characterized in that in the segment of the start / reach part of the propulsion pipe according to claim 4 , fiber reinforced concrete is used as a solidifying material. is there.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 and 2 each show a starting portion and a reaching portion of a propulsion pipe installed as a pipe roof between shield holes dug in parallel. In the figure, the ground of the shield hole 1 includes a plurality of steel shell segments 2. In particular, the starting portion and the reaching portion of the propulsion pipe 3 are covered with a steel shell segment 4 as shown in FIG.
[0023]
Both the steel shell segments 2 and 4 are filled with concrete 5 as filling, and the concrete 5 is also filled in the propelling pipe 3 over its entire length.
[0024]
Further, since both end portions of the propulsion pipe 3 are pin-joined to the steel shell segment 4 by the connection fitting 6 and the connecting pin 7, transmission of the bending moment generated in the propulsion pipe 3 to the steel shell segment 4 side is reduced. It has become so.
[0025]
In this case, since the connection fitting 6 protruding from the propulsion tube 3 rotates around the connecting pin 7, the end of the propulsion tube 3 can rotate following the rotation of the connection fitting 6. A connecting portion 3 a having a steel pipe folding mechanism is provided at the end of the propelling tube 3. As a steel pipe folding mechanism in this case, for example, there is a method in which ends of steel pipes are connected to each other by a sheath pipe method and a bearing is interposed in the connecting part so that a certain amount of the connecting part of the steel pipe is bent.
[0026]
Further, a cradle 8 is attached on the steel shell segment 4, and an end of a reinforcing column 9 that is erected in the shield hole 1 is connected to the cradle 8. The starting portion and the reaching portion of the propulsion pipe 3 are vertically symmetrical on the lower side and the upper side, but in the drawing, only the lower side is shown and the upper side is omitted.
[0027]
The steel shell segment 4 includes a plurality of main girders 4a, 4a installed in parallel to the circumferential direction of the shield hole 1 and a plurality of vertical beams arranged in parallel to the axial direction of the shield hole 1 between the main girders 4a, 4a. It is formed of ribs 4b, 4b and a skin plate 4c attached to the natural ground side of the frame body composed of the main girders 4a and the vertical ribs 4b.
[0028]
In addition, the skin plate 4c and the concrete 5 are not formed in the portion of each steel shell segment 4 through which the propelling pipe 3 passes, and the opening 10 is formed in a rectangular shape, and the main girders 4a and 4a are formed on the inner periphery of the opening 10. An opening frame composed of the vertical ribs 4b and 4b is formed.
[0029]
A segment cover 11 is detachably attached to the opening 10, and an outer shell 12 made of a solidified material is formed on the natural mountain side to a predetermined thickness.
[0030]
The segment cover 11 includes a plurality of main girders 11a, 11a installed in parallel to the circumferential direction of the shield hole 1, and a plurality of vertical ribs installed in parallel to the axial direction of the shield hole 1 between the main girders 11a, 11a. 11b, and is formed from 11b and these main beam 11a and the vertical ribs 11b made of a frame body skin plate 11c attached to the land mountain side of.
[0031]
The segment cover 11 is detachably fitted in the opening 10, and the main girders 11a and 11a on both sides and the vertical ribs 11b and 11b on both ends are connected to the main girders 4a and 4a and the vertical ribs 4b and 4b on the opening frame. It is detachably attached by bolting each.
[0032]
The outer shell 12 is filled with a solidified material such as fiber reinforced concrete to a predetermined thickness so that it can be easily cut by the propulsion unit 13 installed at the tip of the propulsion tube 3 when the end of the propulsion tube 3 penetrates. Is formed.
[0033]
Further, the inside of the outer shell 12 is formed so that the segment cover 11 is removed and an entrance pipe (guide pipe) 14 is attached. When the propulsion pipe 3 penetrates the outer shell 12 while cutting the outer shell 12 with a propulsion machine 13 at the tip of the entrance pipe 14, and when propelling further in the ground, groundwater and earth and sand are surrounded by the propulsion pipe 3 (by the propulsion machine 13 to the outer shell 12. It is installed in order to prevent inflow into the shield hole 1 from the formed through-hole).
[0034]
In order to more reliably prevent the inflow of groundwater and earth and sand, a water-swellable tube seal 15 is attached in a ring shape to the connection portion between the tip of the entrance pipe 14 and the outer shell 12, and inside the entrance pipe 14. The water-stop packing 16 is attached to a plurality of stages in a ring shape.
[0035]
Further, a cooling pipe (not shown) is installed inside the entrance pipe 14 in a coil shape, and brine is circulated through the cooling pipe to freeze the groundwater flowing into the entrance pipe 14 and the injected sliding material. The water can be stopped.
[0036]
The reaching portion of the propulsion pipe 3 has the same structure as the starting portion as described above, so that the same function as the starting portion can be obtained, but an error between the reaching propulsion tube 3 and the entrance pipe 14 is avoided. Therefore, the water stop by the water stop packing 16 or the like may not be realistic .
[0037]
Accordingly, FIG. 9 (a), filling the solidifying material such as poor mixing mortar or foam mortar in the entrance pipe 17 whose tip is closure as shown as shown (b), the post-arrival, the skids It is good also as a structure which removes the entrance pipe 17 after performing the water stop by solidification or backfilling material filling.
[0038]
Next, a construction method for the starting portion of the propulsion pipe in the pipe roof construction method will be described.
[0039]
(1) First, the shield holes 1 and 1 are dug in parallel, and the steel shell segments 4 are respectively incorporated in the starting portion and the reaching portion of the propulsion pipe 3. Then, concrete 5 is placed inside each of the steel shell segments 2 and 4 as filling.
In addition, when placing concrete 5, for example, high-strength concrete 5 is cast in a frame shape along the main girder 4a and the longitudinal rib 4b on the periphery of the steel shell segment 4 and the periphery of the opening 10; Reasonable and economical construction can be performed by placing low-strength concrete inside.
[0040]
(2) Next, the segment cover 11 of the steel shell segment 4 is temporarily removed. Then, an entrance pipe 14 is attached inside the outer shell 12. Further, a tube seal 15 is attached to a connection portion between the entrance pipe 14 and the outer shell 12. Further, a water stop packing 16 is attached to the inside of the entrance pipe 14.
[0041]
(3) Next, the front end portion of the entrance pipe 14 is filled with the filling material 19 and then the propulsion unit 13 is set. The propelling machine 13 passes the propelling pipe 3 through the steel shell segment 4 while cutting the filling material 19 and the outer shell 12 in order, and propels the underground to the shield hole 1 on the opposite side.
In this case, in particular, the tube seal 15 is attached to the connection portion between the entrance pipe 14 and the outer shell 12, and the water stop packing 16 is attached to the inside of the entrance pipe 14, so that the propulsion pipe 3 penetrates the outer shell 12. However, groundwater and earth and sand do not flow into the shield hole 1 from the periphery of the propulsion pipe 3 (through hole formed in the outer shell 12 by the propulsion unit 13).
[0042]
(4) Next, the propulsion pipe 3 is propelled to the shield hole 1 on the opposite side, and when the construction of the propulsion pipe 3 is completed, the propulsion unit 13 is pulled and collected. Further, the tube seal 15 is expanded and a grout material is injected between the propelling tube 3 and the outer shell 12 to seal between the propelling tube 3 and the outer shell 12.
[0043]
(5) Next, the entrance pipe 14 is removed. Further, the excess portion of the propulsion pipe 3 (the portion protruding to the inside of the steel shell segment 4) is cut and removed from the bottom surface portion of the outer shell 12.
[0044]
{Circle around (6)} Next, filling concrete 5 is filled into the propelling tube 3 over its entire length, and the fitting 6 is inserted and attached to the end.
[0045]
(7) Next, the segment cover 11 is reattached to the opening 10, and the bracket 21 protruding from the segment cover 11 and the connection fitting 6 are joined by the connecting pin 7. Moreover, the connection part 3a provided with the steel pipe bending mechanism in the edge part of the propulsion pipe 3 is provided. In addition, the grout material is filled in the gap 22 at the end of the propulsion pipe 3.
[0046]
(8) Next, the concrete 5 is placed in the segment cover 11 as a filling, and then a pedestal 8 is mounted on the segment cover 11 and a reinforcing column 9 is erected thereon.
[0047]
Note that the construction of the reaching portion of the propulsion pipe 3 can be performed by the same method as that of the starting portion as described above. However, since an error between the reached propulsion pipe 3 and the entrance pipe 17 is unavoidable, the stop portion is stopped. Water stoppage with water packing or the like may not be a reality.
[0048]
Therefore, and FIG. 8 (b) and FIG. 9 (a), filling the solidifying material such as poor mixing mortar or foam mortar in the entrance pipe 17 as illustrated, the tip is closing (b), the post-arrival, The entrance pipe 17 may be removed after the sliding material is solidified or the water is stopped by filling the backfill material.
[0049]
【The invention's effect】
The invention of the present application is as described above, and in particular, an opening is provided in a segment installed in the start / reach part of the propulsion pipe, an outer shell made of a solidified material is formed in the opening, and the propulsion pipe is provided in the outer shell. Through the penetration and propulsion, there is no need for large-scale ground improvement at the start / arrival section, which has been required so far, drastically reducing labor and shortening the construction period, and drastically reducing construction costs. Can be achieved.
[0050]
In addition, since the segment cover is detachably attached to the inside of the outer shell, it can be cut directly by a propulsion unit, and a stable structure as a segment of the start / reach part of the propulsion pipe can be installed. As a result, it is possible to obtain a satisfactory water stop structure.
[0051]
Furthermore, by interposing a flexible material between the segment cover and the propulsion pipe , the axial force and shearing force acting on the segment via the propulsion pipe can be reduced, and excessive loads during an earthquake are also absorbed. The effect of reducing the reinforcement of the segment can be expected.
[Brief description of the drawings]
FIG. 1 shows the structure of a starting portion of a propulsion pipe, wherein (a) is a longitudinal sectional view thereof and (b) is a plan view thereof.
FIGS. 2A and 2B show a structure of a reaching portion of a propulsion pipe, wherein FIG. 2A is a longitudinal sectional view thereof, and FIG.
FIG. 3 is a cross-sectional view showing a propulsion pipe installed as a pipe roof between shield holes excavated in parallel and between the shield holes;
FIG. 4 is a perspective view showing an example of a steel shell segment installed at a start / reach part of a propulsion pipe.
FIGS. 5A and 5B are cross-sectional views showing a construction method of a starting portion of a propulsion pipe.
FIGS. 6A and 6B are cross-sectional views showing a construction method of a starting portion of a propulsion pipe.
FIGS. 7A and 7B are cross-sectional views showing a construction method of a starting portion of a propulsion pipe.
FIGS. 8A and 8B are cross-sectional views showing a method for constructing a reaching portion of a propulsion pipe. FIGS.
FIGS. 9A, 9B, and 9C are cross-sectional views showing a construction method of a reaching portion of a propulsion pipe.
FIG. 10 is a cross-sectional view showing a pipe roof construction method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shield hole 2 Steel shell segment 3 Propulsion pipe 4 Steel shell segment 5 Filled concrete 6 Connection metal fitting 7 Connecting pin 8 Base 9 Strut 10 Opening 11 Segment cover 12 Outer shell 13 Propulsion machine 14 Entrance pipe (guide pipe)
15 Tube seal 16 Water seal 17 Entrance pipe 19 Filling material 21 Bracket 22 Air gap

Claims (5)

An opening is provided in a segment installed in the starting or reaching part of the propulsion pipe, an outer shell made of a solidified material is provided in the opening , an entrance pipe is protruded from the outer shell, and the entrance pipe is penetrated. A propulsion pipe start / reach method for propelling a propulsion pipe, wherein a cooling pipe is installed inside the entrance pipe and brine is circulated through the cooling pipe . The method for starting and reaching a propulsion pipe according to claim 1 , wherein a water stop packing is attached to the inside of the entrance pipe . 3. The starting and reaching method for a propulsion pipe according to claim 1 , wherein the cooling pipe is installed in a coil shape inside the entrance pipe . A segment cover installed in a starter portion or a reaching portion of the propulsion pipe, the segment cover having an opening in a portion through which the propulsion pipe passes, and detachably attached to the opening; and An outer shell made of a solidified material formed on the natural ground side, an entrance pipe that is attached to the segment cover and through which the propulsion pipe can pass, and a cooling pipe that is attached to the inside of the entrance pipe. A characteristic start / reach segment. The start / reach part segment according to claim 4, wherein fiber-reinforced concrete is used as the solidifying material .

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