JP4702985B2 - Removal method of underground obstacle in underground structure construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for removing underground obstacles in an underground structure construction method, and more specifically, a large number of elements are sequentially inserted in parallel to a natural ground below a vehicle traveling path such as a railroad or a road. Further, the present invention relates to a method for removing an obstacle that hinders element penetration when an underground structure that crosses a traveling path is constructed.
[0002]
[Prior art]
As one of the underpass construction methods for constructing an underground structure (tunnel) that crosses tracks, roads, etc., a construction method using a hollow box-shaped element made of steel is known. In this method, a large number of steel elements are juxtaposed and sequentially penetrated into a natural ground, and then a natural ground portion partitioned inside the element row is excavated to use the element row as an underground structure.
[0003]
Each element is penetrated into the natural ground by towing or propulsion, but if there are obstacles in the form of belts such as retaining piles or retaining walls in the penetration path of these elements, these obstacles will be removed from the ground in advance or at the time of construction. It is common to be removed from the mouth. However, in the case of prior removal from the ground, there are restrictions on the ground such as work range and time due to the vehicle traveling.
[0004]
If it cannot be removed in advance due to restrictions on the ground, it must be removed from the blade edge. To that end, the excavator installed on the blade edge must be temporarily recovered, especially towing. Or, if the propulsion length is long, it takes a lot of time. In the case of the construction method by traction, a serious problem as shown in FIG. 12 also occurs.
[0005]
FIG. 12 is a plan view showing a pulling state of the succeeding element 101 after the preceding element 100. The leading element 100 has been pulled by a plurality of pulling wires 102, and a pulling wire 104 for the trailing element 101 is attached to the blade edge element 103 at the time of pulling. When the trailing element 101 starts to be pulled, the pulling wire 104 for the trailing element is detached from the blade edge element 103 and is slid in the ground. Then, the trailing end of the pulling wire 104 is fixed to the trailing element 101 in the starting shaft, the tip of the pulling wire 104 is attached to the pulling jack installed in the reaching shaft, and the trailing element 101 is pulled.
[0006]
When the trailing element 101 is towed, if there is an obstacle 105 such as a retaining pile extending in the vertical direction in the towing path, the towing wire 104 is obstructed by the obstacle 105 and is bent, and the towing is impossible. Sometimes. In such a state, the blade edge element 106 of the succeeding element 101 cannot approach the obstacle 105, and the obstacle cannot be removed.
[0007]
[Problems to be solved by the invention]
The present invention has been made based on the technical background as described above, and achieves the following object.
The object of the present invention is to remove obstacles in the penetration path of the succeeding element at the time of construction of the preceding element and to remove the obstacle in the underground structure construction method capable of greatly shortening the construction time. Is to provide.
[0008]
[Means for Solving the Problems]
The present invention employs the following means in order to achieve the above object.
In other words, the present invention is a method of constructing an underground structure with these element rows by sequentially penetrating into a natural mountain in parallel with a number of hollow elements,
Each element is composed of a blade edge element, an obstacle removal element, and a plurality of structural elements connected in the axial direction sequentially from the top, and an opening is provided in a part of the peripheral wall of the obstacle removal element. Furthermore, the obstacle exploration device is provided in the obstacle removing element or the blade edge element so as to be located in front of the opening,
When the preceding element that penetrates prior to the natural ground penetrates into the natural ground, obstacles in the penetration path of the succeeding element that penetrates downstream from the natural ground are introduced into the preceding element from the opening. It is in the removal method of underground obstacles in the underground structure construction method characterized by taking in and removing.
[0009]
According to this invention, when the preceding element penetrates into the natural ground, the obstacle in the penetration path of the succeeding element is taken into the preceding element and removed through the opening provided in a part of the peripheral wall. Therefore, it is not necessary to collect the excavator temporarily, and the construction time can be shortened.
[0010]
As a more specific aspect of the present invention, a retaining plate that is pushed out toward a natural ground is provided at a peripheral portion of the opening, and a jack for operating the retaining plate is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view showing an underpass construction method to which the present invention is applied, and is an example of constructing an underground structure in a natural ground below a track 1. In this underpass construction method, a start shaft 2 and a reach shaft 3 are provided on both sides of the track 1, and a number of steel elements 4 are sequentially penetrated into the ground in parallel from the start shaft 2 to the reach shaft 3. The
[0012]
Adjacent elements 4 are connected to each other at the time of penetration by a joint (not shown) provided in the longitudinal direction. After intrusion, concrete is cast inside each element 4, the inner ground 5 divided by the element row is excavated, and an underground structure (tunnel) by the element row is constructed. The steel element 4 generally has a box shape, that is, a rectangular section. However, as disclosed in Japanese Patent Application Laid-Open No. 11-247579, a construction method using a square section and a U-shaped section. There is also.
[0013]
FIG. 2 is a plan view showing the element 4. Each element 4 used in this construction method is divided into a plurality of parts in the axial direction, a leading edge part element 6 equipped with an unillustrated excavator, an obstacle removing element 7, and a plurality of structural elements. These dividing elements are sequentially connected in the axial direction at the starting shaft and penetrate into the natural ground.
[0014]
The illustrated example shows an element that is penetrated into a natural ground by towing, and a towing wire 9 for towing the element 4, that is, the preceding element, to the obstacle removing element 7 and a towing wire for towing the succeeding element. 10 is fixed. The traction wire 9 is connected to a traction jack installed in the reaching shaft.
[0015]
3 is a side view schematically showing the obstacle removing element 7, and FIG. 4 is a cross-sectional view perpendicular to the element axis. An opening 11 is provided on one side wall of the obstacle removing element 7, and this opening 11 is normally closed by a removable closing plate 12. At the upper and lower edges of the opening 11, there are provided retaining plates 13, 13 that slide in a direction perpendicular to the element axis, and these retaining plates 13, 13 are pushed out toward the ground.
[0016]
As shown in FIG. 2, while the leading element 4 is being pulled by the pulling wire 9, when the obstacle removing element 7 reaches near the obstacle 50 in the pulling path of the trailing element, the pulling is stopped and the removing work is performed. Do it. FIG. 5 is a plan view showing a state where the obstacle is removed, and FIG. 6 is a cross-sectional view perpendicular to the element axis. First, the upper and lower earth retaining plates 13 and 13 are pushed out toward the natural ground to stabilize the surrounding natural ground, and then the closing plate 12 is removed to open the opening 11.
[0017]
And a natural ground is excavated toward the obstacle 50, and the obstacle 50 is taken in in an element. At that time, when the obstacle 50 extends in a vertical direction such as a pile, a length range that does not hinder the pulling of the succeeding element is cut. After the removal, there will be a cavity in the natural ground, but this cavity is filled with plastic solid injection material. After the backfilling, the opening 11 is closed by the closing plate 12, and the earth retaining plates 13 and 13 are pulled back to resume traction.
[0018]
If the position of the obstacle 50 is known in advance, the removal operation is performed when the element is pulled to the required distance. However, since the position is not known, the exploration device 14 (see FIG. 2). ) Can be equipped on the element. The exploration device 14 is installed on the obstacle removing element 7 or the blade edge element 6 so as to be positioned in front of the opening 11 in the pulling direction. As the exploration device 14, for example, an apparatus that radiates electromagnetic pulse waves and detects the presence or absence of obstacles by reflected waves can be used. A probe bar operated by a jack may be attached to the obstacle removing element 7 and the presence or absence of the obstacle may be detected by pushing the probe bar into the ground.
[0019]
7 to 9 show details of the obstacle removing element 7, FIG. 7 is a plan view, FIG. 8 is a side view, and FIG. 9 is a cross-sectional view perpendicular to the element axis. The illustrated element 7 is used to construct a circular tunnel, so that the cross-sectional shape is an inverted trapezoid. At the upper and lower portions of the obstacle removing element 7, there are provided a fixing portion 15 of the pulling wire 9 for pulling the preceding element, and a fixing portion 16 of the pulling wire 10 for pulling the trailing element. It has been.
[0020]
In addition, housing portions 17 and 17 for the earth retaining plate 13 are provided at the upper and lower portions of the obstacle removing element 7. Each earth retaining plate 13 is composed of two slide plates 13a and 13b that are accommodated by being stacked on the accommodating portion 17, that is, a two-stage slide plate. A jack 18 is connected to the outer slide plate 13a.
[0021]
10 and 11 are cross-sectional views perpendicular to the element axis showing the operating state of the earth retaining plate 13. When removing the obstacle, the jack 18 is operated, and first, the slide plates 13a and 13b are simultaneously pushed out toward the natural ground (FIG. 10). At this time, a bearing jack 19 is arranged between the inner slide plates 13b and 13b in order to counter the vertical earth pressure. Next, the inner slide plate 13b is manually slid with respect to the slide plate 13a and pushed out toward the natural ground (FIG. 11). After the removal of the obstacle, contrary to the above, first, the slide plate 13b is drawn onto the slide plate 13a, and then both the slide plates 13a and 13b are drawn into the housing portion 17 by the operation of the jack 18.
[0022]
The above embodiments are merely examples, and the present invention can take various forms. The retaining plate is not necessarily used depending on the condition of the natural ground. Furthermore, when the element that is the structural material of the upper floor slab of the underground structure is penetrated into the natural ground, the vertical earth pressure acts when removing the obstacle because the opening is located on the side of the element. By using the plate 13, the removal work can be performed safely. On the other hand, when penetrating an element that will be the structural material of the side wall plate of the underground structure into the ground, the opening is located below, so it is the side earth pressure that acts when removing the obstacle, and the earth retaining plate Even without using, there is a case where the collapse of the natural ground does not occur.
[0023]
Moreover, although the example which penetrates an element in a natural ground by towing was shown in the said embodiment, this invention is applicable also in the case of propulsion construction. Furthermore, the present invention can be applied not only to constructing the box-shaped tunnel shown in FIG. 1 but also to constructing a circular tunnel.
[0024]
【The invention's effect】
As described above, according to the present invention, when the preceding element penetrates into the natural ground, the obstacle in the penetration path of the succeeding element is passed through the opening provided in a part of the peripheral wall of the preceding element. Since it is taken in and removed, temporary excavation of the excavator becomes unnecessary, and construction time can be greatly shortened.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view showing an underpass construction method to which the present invention is applied.
FIG. 2 is a plan view showing an element.
FIG. 3 is a side view schematically showing an obstacle removing element.
FIG. 4 is a cross-sectional view perpendicular to the element axis of the element.
FIG. 5 is a plan view of an obstacle removing element at the time of removal.
FIG. 6 is a cross-sectional view perpendicular to the element axis of the element.
FIG. 7 is a plan view showing details of an obstacle removing element.
FIG. 8 is a side view of the element.
FIG. 9 is a cross-sectional view perpendicular to the element axis of the element.
FIG. 10 is a cross-sectional view perpendicular to the element axis showing the operating state of the earth retaining plate.
FIG. 11 is a cross-sectional view perpendicular to the element axis showing the operating state of the earth retaining plate following FIG. 10;
FIG. 12 is a plan view showing a state where traction is impossible due to an obstacle.
[Explanation of symbols]
4: Element 6: Blade edge element 7: Obstacle removal element 8: Structural element 9: Pulling wire 10: Pulling wire 11: Opening part 12: Closing plate 13a: Slide plate 13b: Slide plate 13: Dust plate 14 : Exploration device 18: Jack 19: Bearing jack 50: Obstacle

Claims (3)

In the construction method where a large number of hollow elements are juxtaposed and sequentially penetrated into the natural ground, and an underground structure is constructed by these element rows,
Each element is composed of a blade edge element, an obstacle removal element, and a plurality of structural elements connected in the axial direction sequentially from the top, and an opening is provided in a part of the peripheral wall of the obstacle removal element. Furthermore, the obstacle exploration device is provided in the obstacle removing element or the blade edge element so as to be located in front of the opening,
When the preceding element that penetrates prior to the natural ground penetrates into the natural ground, obstacles in the penetration path of the succeeding element that penetrates downstream from the natural ground are introduced into the preceding element from the opening. A method for removing underground obstacles in an underground structure construction method characterized by capturing and removing. 2. A method for removing an underground obstacle in an underground structure construction method according to claim 1, wherein a retaining plate pushed out toward a natural ground is provided at a peripheral edge of the opening. The method for removing underground obstacles in the underground structure construction method according to claim 2, wherein a jack for operating the earth retaining plate is provided.

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