JP4303511B2 - Construction method of large section tunnel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for constructing a large section tunnel while constructing a plurality of small section tunnels obtained by dividing a large section, and a method for constructing a large section tunnel using a temporary small section segment.
[0002]
[Prior art]
When constructing a tunnel underground, excavation method that constructs mountain retaining walls on both sides of the tunnel along the tunnel axis, excavates the inside and constructs the tunnel box, then backfills and removes the retaining wall Has been done.
On the other hand, when constructing underground three-dimensional intersection tunnels under roads, railways, etc., construction by the shield method or propulsion method is generally used in order to avoid the obstacle to the ground traffic due to the above-mentioned open-cut method.
By the way, underground tunnels have become larger in section due to the recent increase in traffic volume and diversification of applications of underground tunnels. When constructing such a large section tunnel, a large section tunnel is constructed by constructing and connecting a plurality of small section tunnels by a shield method. In the open-cut method, auxiliary works such as ground improvement are used together, and construction is carried out while occupying a wide work zone.
As shown in FIG. 9, the inventors have devised and disclosed a method of installing a plurality of small cross-sectional tunnels by a propulsion method so as to be adjacent to each other when constructing a large cross-sectional tunnel (Patent Literature). 1). Here, the propulsion of the propelling pipe a is installed while fitting the protrusion c provided on the other side wall into the groove b formed on one side wall.
[0003]
The open shield method is currently used as a method that combines the advantages of the open cut method and the shield method. The open shield method uses a shield machine that opens forward and upward, excavates and excavates the ground in the face excavation chamber with a backhoe, and uses a hydraulic jack to propel the shield machine with the installed box as a reaction force. While the box is laid, tail voids are injected and the upper part of the box is backfilled. Note that Patent Document 2 discloses such an open shield machine and an open shield method using such an open shield machine.
[0004]
[Patent Document 1]
JP 2001-214699 A [Patent Document 2]
JP-A-2002-70481
[Problems to be solved by the invention]
The conventional large-section tunnel construction method has the following problems.
<I> Since the open-cut method occupies a wide work zone due to the necessity of large machines, it can be a cause of traffic congestion on the ground.
<B> In the excavation method, since it has a great influence on surrounding facilities close to the construction site, it is inevitable to use an auxiliary method such as ground improvement.
<C> With the shield method, excavation corresponding to a large cross section becomes difficult. Further, even when a large-section tunnel is constructed by combining divided bodies obtained by dividing a large section into small sections, it is difficult to use the shield method when the earth covering is small.
[0006]
OBJECT OF THE INVENTION
The present invention was made to solve the conventional problems as described above, and an object of the present invention is to provide a method for constructing a large section tunnel that does not need to occupy a wide work zone on the ground when constructing a large section tunnel. And Another object of the present invention is to provide a method for constructing a large section tunnel that has little influence on surrounding facilities close to the construction site. It is another object of the present invention to provide a method for constructing a large section tunnel under conditions where there is little earth covering.
The present invention achieves at least one of these objects.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the method for constructing a large-section tunnel according to the present invention includes a plurality of boxes stacked in a vertical direction in the excavation groove while creating a rectangular excavation groove in cross section in the ground. constitute a box member group, to build a box body placing step to continue to installed adjacent to the box body group to the excavation, and a step backfill back filled to the top of the box making body group, a box body group column by the said Using a retaining wall provided in advance at the end of the upper floor plate upper surface of the box at the uppermost stage of the box group, excavating between the plurality of box group rows constructed in parallel at intervals, A construction method for a large-section tunnel, characterized in that a main-structure large-section tunnel is constructed using the box group row as a retaining support member.
[0009]
Further, according to the construction method of the large section tunnel of the present invention, a plurality of boxes are stacked and installed vertically in the excavation groove while forming a rectangular excavation groove on the ground, and the excavation group is formed. A box installation process in which a box group is installed adjacent to the groove, and a mountain retaining wall is engaged with a retaining wall locking post provided in advance near the upper surface of the upper floor of the box at the top of the box group. And a backfilling step for backfilling the upper part of the box group by installing a mountain retaining wall, and building a box group row between the plurality of box group rows built substantially in parallel at intervals. Is constructed using a retaining wall and constructs a large section tunnel while using the box group as a retaining support member.
[0011]
In addition, the construction method of the large cross-section tunnel of the present invention includes a split box installation process in which a split box obtained by splitting the main box into the excavation groove is installed while a rectangular excavation groove having a rectangular cross section is created in the ground. , A backfilling step for backfilling the upper part of the divided box, and constructing a divided box row, and using a retaining wall provided in advance at the end of the upper floor slab of the divided box, with an interval Excavating between a plurality of the divided box rows constructed substantially in parallel, and removing the temporary installation wall provided on the side surface of the divided box facing each other with the gap interposed therebetween, thereby separating the divided box holding the gap. It is a construction method of a large section tunnel characterized by joining rows.
[0012]
Furthermore, the construction method of the large cross-section tunnel of the present invention includes a split box installation process in which a split box obtained by splitting the main box into the excavation groove is installed while a rectangular excavation groove having a rectangular cross section is formed on the ground. , A backfilling step of locking the mountain retaining wall to the retaining wall retaining column provided in the vicinity of the end of the upper surface of the upper floor slab of the divided box and setting the mountain retaining wall to refill the upper portion of the divided box. Excavating between the plurality of divided box rows constructed in parallel and spaced apart by using the retaining wall, on the side surfaces of the divided box facing each other across the gap This is a construction method of a large-section tunnel characterized by joining the divided box rows with a gap between them by removing a temporary installation wall provided.
[0013]
Moreover, the construction method of the large section tunnel of this invention can create the said excavation groove using the open shield machine which open | releases the ceiling of a shield machine and performs shield tunneling.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
<I> Open shield machine (Fig. 7 (a), (b))
The open shield machine 11 is a known machine 1 in which the front and upper sides of the machine 1 are opened while retaining the earth with left and right side wall plates 111. The box 2 is suspended from the ground while excavating and excavating with a backhoe 91 and the like, and the reaction force is applied to the box 2 and the hydraulic jack 112 is used for excavation. Since the side wall plate 111 holds the earth, the influence of excavation hardly extends to the surroundings, and since the hydraulic jack 112 is used, it is suitable for construction in a residential area because there is little noise and vibration. In addition, curved construction is also possible by using an open shield machine 11 having a folded structure in which the side wall plate 111 is divided into two.
In the present invention, it is preferable to use the open shield excavator 11 when constructing a large-section tunnel under conditions with less soil covering. In particular, a vertically long open shield machine 11 is used to create a plurality of rectangular excavation grooves 3 (longitudinal grooves) having a rectangular cross-section in the ground at intervals 6.
[0017]
<B> Modified cross section shield machine (Fig. 8 (a), (b))
As the modified cross-section shield machine 12, for example, a shield machine having a rectangular (or square) cross-sectional view, the front surface of the machine 1 is provided with a plurality of swing cutters 122 that swing around the drill axis 121 in the direction of the drill axis. 1 can be used. The plurality of swing cutters 122 can be controlled so as not to overlap the excavation ranges of the respective swing cutters 122. That is, for example, two rocking cutters 122 are arranged in the same plane or both front and back, and each rocking cutter 122 is excavated only in its own range of ownership. When excavating a rectangular cross section, for example, the rectangular cross section is equally divided into two, and the ground can be cut while the two swing cutters 122 swing within the respective divided ranges. In this case, the swing of the swing cutter 122 can be controlled so as to swing in the opposite direction about the swing shaft 121. With this control, the two rocking cutters 122 can perform excavation without interfering with each other and while ensuring the traveling direction of the excavator 1 in a certain direction.
[0018]
When the excavation groove 3 is formed by using the modified cross-section shield machine 12, it is preferable to provide the cut mountain retaining body 13 on the ceiling of the excavator 1. Here, the cutting pile retaining body 13 includes, for example, two mountain retaining plates 131 arranged upright substantially in parallel with an interval of about the width of the modified cross section shield machine 12, and a plurality of interval holding members 132 are arranged at such intervals. It is manufactured by vertically connecting to each mountain retaining plate 131. As the mountain retaining plate 131, it is preferable to use a material having rigidity as a mountain retaining member such as a steel plate. Moreover, as the space | interval holding member 132, an H-type steel material can be used, for example.
The purpose of using the cut mountain retaining body 13 is to propel the mountain retaining plate 131 into the ground according to the excavation of the modified cross section shield machine 12, and while retaining the earth with the mountain retaining plate 131, the inside of the mountain retaining plate 131 is backhoeed from the ground. This is because the box 2 is suspended in the modified cross section shield machine 12 by excavating at 91 or the like. In addition, it is preferable that the cutting mountain retaining body 13 has a structure that can be attached to and detached from the ceiling of the excavator 1.
[0019]
[Example 1]
Hereinafter, Example 1 of the construction method of the large section tunnel of this invention is described, referring drawings.
[0020]
<I> Box installation process (Fig. 1 (a))
Using the open shield machine 11 or the modified cross-section shield machine 12, the excavation groove 3 having a rectangular cross-sectional view is formed on the ground. The above-described excavator 1 is preferably a vertically long excavator 1 so as to adapt to the height of the large-section tunnel to be constructed. Next, the box 2 having a height obtained by dividing the height of the large section tunnel into, for example, two or three, is suspended from the ground by a crane 92 or the like, stacked in the vertical direction in the excavation groove 3, and installed in the box group 21. Make up. The box 2 is preferably manufactured to a size that can be transported in a factory, for example. Moreover, since this box 2 is a temporary support member for constructing a permanent tunnel, the box 2 constituting member only needs to have a thickness sufficient to withstand earth pressure. The box 2 can be made of, for example, a cement-based material.
The box group 21 described above is installed adjacent to the tunnel extension direction according to the excavation of the excavator 1.
[0021]
<B> Backfilling process (Fig. 1 (b))
While installing the box group 21, the upper part of the box group 21 is backfilled. That is, it is preferable to proceed the backfilling process in parallel with the above box installation process. By completing the backfilling process, a single box group 22 extending in the tunnel extension direction is constructed.
In the present invention, since a plurality of the box group rows 22 are constructed substantially in parallel at intervals, the plurality of box group rows 22 are constructed for each row in consideration of the construction period and construction cost. It is also possible to construct each row at the same time by using a plurality of excavators 1.
After the backfilling process is completed, it can be used as a ground road by pavement.
[0022]
<C> Excavation between the box bodies (Fig. 2 (a))
In the excavation between the box body rows 22, the earth covering portion on the box body group 21 is excavated while forming a predetermined slope from the ground, and excavation between the box side walls of the box body row 22 is performed. Can dig up to near the bottom level of Hako-gun 22 while using the box as a supporting member for mountain retaining.
Further, as another method, for example, steel spacing excavation mountain retaining plates are propelled in the tunnel extension direction in the vicinity of the uppermost level and the lowermost level of the box group row 22 in parallel from the tunnel extension end, and the vertical earth pressure is increased. Can be supported by an interval excavation mountain retaining plate, and the left and right can be excavated between the box groups 22 while using the box 2 as a mountain retaining member. According to this method, since it is not necessary to secure a construction occupation zone associated with excavation on the ground, the problem of traffic obstacles due to the construction occupation zone can be minimized.
[0023]
<D> Construction of a large tunnel with a permanent construction (Fig. 2 (b))
After the excavation between the box bodies 22 is completed, or in parallel with the excavation between the boxes 20, the main large-sized tunnel 4 is constructed. The constituent members of the box 2 constituting the box group 22 are used as outer molds, and the constituent members (the upper floor slab, side walls, column bases, etc.) of the main large-sized tunnel 4 while removing the constituent members of the box 2 are removed. Bottom plate etc.).
[0024]
[Example 2]
Hereinafter, Example 2 of the construction method of the large section tunnel of this invention is described, referring drawings. In addition, about the process which overlaps with Example 1, it abbreviate | omits.
[0025]
On the upper surface of the upper floor slab of the box 2 arranged at the uppermost stage of the box group 21, the box 2 is installed in the vicinity of the end of the parallel box group 22 side with the retaining wall 5 installed in advance. Complete the backfill process. As the retaining wall 5, a concrete wall can be provided, or a steel sheet pile wall can be provided (see FIG. 3A).
By providing such a retaining wall 5, the construction occupation band width on the ground can be reduced as much as possible as compared with the case of excavating while forming a slope from the ground.
[0026]
[Example 3]
Hereinafter, Example 3 of the construction method of the large section tunnel of the present invention will be described with reference to the drawings. In addition, the process which overlaps with another Example is abbreviate | omitted.
[0027]
On the upper surface of the upper floor slab of the box 2 arranged at the uppermost stage of the box group 21, a mountain retaining column 51 for installing the mountain retaining wall 5 is provided in the vicinity of the end of the parallel box group 22 side. The box 2 is installed in the installed state (see FIG. 3B). The mountain retaining column 51 may be formed in an L shape in cross section in order to stabilize the column. Next, after the mountain retaining wall 5 such as a steel sheet pile is engaged with the mountain retaining column 51, the upper portion of the box 2 is backfilled.
[0028]
[Example 4]
Hereinafter, Example 4 of the construction method of the large section tunnel of this invention is described, referring drawings. In addition, the process which overlaps with another Example is abbreviate | omitted.
[0029]
Instead of constructing the temporary box group row 22 in advance as in the first to third embodiments, a divided box installation process is performed in which the divided box 23 obtained by dividing the main box is installed in the excavation groove 3. After that (see FIG. 4A), or in parallel with the split box installation step, the upper part of the split box 23 is backfilled to construct the split box series 24. Such a divided box sequence 24 can be constructed for each column or in parallel with each other (see FIG. 4B). Here, the division box 23 is produced by temporarily installing the temporary installation wall 7 on a casing made up of a side wall and a part of the upper floor slab and the lower floor slab, for example. deep. The temporary installation wall 7 is provided on the side surface facing the divided box rows 24 installed with the gap 6 therebetween, so that the gap 6 is removed before excavating the gap 6 and joining the divided box rows 24 together. This is to make it easier. The temporary installation wall 7 is preferably made of a steel material or a cement-based material, and temporarily installed with the divided box 23 by, for example, bolt joining.
Excavation of the interval 6 between the plurality of divided box rows 24 in the present embodiment is performed in the same manner as in the first embodiment by performing excavation while forming a predetermined slope from the ground, or by setting the interval excavation mountain retaining plate in the tunnel extending direction. This is done by a method of propulsion and excavation (see FIG. 5A). Moreover, it can also excavate by the excavation method using the retaining wall 5 like Example 2 or 3 (refer Fig.6 (a), (b)). After the excavation is completed or in parallel with excavation, the main large-sized tunnel 4 is constructed while joining the divided box rows 24 to each other (see FIG. 5B).
[0030]
【The invention's effect】
Since the construction method of the large section tunnel of the present invention is as described above, the following effects can be obtained.
<I> Since it does not occupy a wide work zone, construction work can be carried out with fewer ground traffic obstacles.
<B> Since the excavation groove is formed on the ground using an open shield excavator or a modified cross-section shield excavator equipped with a cutting pile, the influence of excavation is difficult to reach the periphery.
<C> By reducing the size of the box, the crane for hanging the box can be downsized.
<D> Temporary box or main division box plays the role of retaining wall and retaining support member, so there is no need for retaining wall construction or beam installation, shortening the overall process it can.
[Brief description of the drawings]
FIG. 1 is a construction flow diagram for explaining a first embodiment of a construction method for a large section tunnel according to the present invention, and (a) an explanatory diagram of a box installation process. (B) Explanatory drawing which constructed | assembled the backfilling process and the 2nd box box group row | line | column.
FIG. 2 is a construction flow diagram for explaining a first embodiment of the construction method for a large section tunnel according to the present invention, and (a) an explanatory diagram excavating between box groups. (B) Explanatory drawing explaining the completion of construction of the main large-sized tunnel.
FIG. 3A is an explanatory view of excavating between box groups of Example 2 of the method for constructing a large-section tunnel according to the present invention. (B) Explanatory drawing which is excavating between the box group rows of Example 3 of the construction method of the large section tunnel of this invention.
FIG. 4 is a construction flow diagram for explaining a fourth embodiment of the construction method for a large-section tunnel of the present invention, and (a) an explanatory diagram of a split box installation step. (B) Explanatory drawing which constructed | assembled the backfilling process and the division | segmentation box body of the 2nd row.
FIG. 5 is a construction flow diagram for explaining a fourth embodiment of the construction method for a large-section tunnel according to the present invention, and (a) an explanatory diagram excavating between divided box rows. (B) Explanatory drawing explaining the completion of construction of the main large-sized tunnel.
FIG. 6A is an explanatory diagram in which excavation is performed using a retaining wall between divided box rows in a fourth embodiment of the construction method of a large-section tunnel according to the present invention. (B) Explanatory drawing which is excavating between division | segmentation box columns using the mountain retaining locking column and the retaining wall in Example 4 of the construction method of the large section tunnel of this invention.
FIG. 7A is a perspective view of an open shield machine. (B) Explanatory drawing explaining the condition which has installed the box while creating a digging groove with an open shield machine.
FIG. 8A is a front view of a modified cross section shield machine. (B) Explanatory drawing explaining the condition which has installed the box while creating the excavation groove by the irregular cross-section shield machine.
FIG. 9 is an explanatory diagram for explaining a conventional method for constructing a large-section tunnel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Digging machine 11 ... Open shield digging machine 12 ... Deformed cross-section shield digging machine 13 ... Cut-off mountain retaining body 131 / Mountain retaining plate 132 / Spacing member 2 ... Box 21 ... Box group 22 -Box group row 23-Divided box row 24-Divided box row 3-Excavation groove 4-Main large section tunnel 5-Mountain retaining wall 6-Interval 7-Temporary installation wall

Claims (5)

A box that forms a group of boxes by vertically stacking multiple boxes in the excavation groove while forming a rectangular excavation groove in the ground, forming a group of boxes, and the box group is installed adjacent to the excavation groove Installation process;
Constructing a box group by backfilling the upper part of the box group,
Using a mountain retaining wall provided in advance on the upper end of the upper floor slab of the box at the uppermost stage of the box group, excavation is made between a plurality of box group rows constructed in parallel at intervals. ,
While constructing a large-sized tunnel with a main section while using the box group as a retaining ring support member,
Construction method of large section tunnel. A box that forms a group of boxes by vertically stacking multiple boxes in the excavation groove while forming a rectangular excavation groove in the ground, forming a group of boxes, and the box group is installed adjacent to the excavation groove Installation process;
The upper part of the box group is buried in the uppermost plate of the box group by locking the mountain retaining wall to a retaining wall locking post provided in advance near the end of the upper floor plate of the box. A box group is constructed by a backfilling process,
Excavation between the plurality of box group rows constructed in parallel at intervals using the retaining wall,
While constructing a large-sized tunnel with a main section while using the box group as a retaining ring support member,
Construction method of large section tunnel. A split box installation process in which a split box obtained by splitting the main box into the excavation groove is installed while creating a rectangular excavation groove in the ground in the ground,
A backfilling step of backfilling the upper part of the divided box, and constructing a divided box row,
Using a mountain retaining wall provided in advance at the end of the upper floor slab upper surface of the divided box, excavating between the plurality of divided box rows constructed substantially in parallel at intervals,
By removing the temporary installation wall provided on the side surface of the split box facing each other with the gap between, the split box rows with the gap are joined together,
Construction method of large section tunnel. A split box installation process in which a split box obtained by splitting the main box into the excavation groove is installed while creating a rectangular excavation groove in the ground in the ground,
Dividing by a backfilling step of locking the mountain retaining wall to a retaining wall retaining column provided in advance near the end of the upper surface of the upper floor slab of the divided box and setting the mountain retaining wall to refill the upper part of the divided box Construct a box sequence,
Excavating between the plurality of divided box rows constructed in parallel at intervals using the retaining wall,
By removing the temporary installation wall provided on the side surface of the split box facing each other with the gap between, the split box rows with the gap are joined together,
Construction method of large section tunnel. Characterized in that the excavation groove is created using an open shield excavator that opens the ceiling of the shield excavator to the ground and performs shield excavation,
The construction method of the large section tunnel in any one of Claims 1 thru | or 4.

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