JP2004176432A - Construction method for underground structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction method for an underground structure that can simultaneously advance under-track work and caisson construction working, and can shorten a construction period in the case where the underground structure is constructed under a work girder or the like, and can improve workability and improve quality control without performing the caisson construction working in a narrow space under the work girder. <P>SOLUTION: In the construction method for the underground structure in which the work girder is erected and excavated under the track and the underground structure is constructed in an excavated part, a pipe propulsion jack 9 is installed, a starting base 4 embedding a pipe jacking guide member 7 is constructed, and a reaction guide member 8 that can move forward by following pipe jacking of the underground structure by the pipe propulsion jack 9 is attached on the pipe jacking guide member 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for constructing an underground structure using a concrete box or the like constructed under a track.
[0002]
[Prior art]
For example, there is an open-cutting method using a construction girder as one of the methods of constructing an underground structure using a concrete box so as to cross it under a track. The construction girder method is a method of constructing an underground structure with a concrete box while excavating under a railway track in operation and temporarily receiving a train load with the construction girder, as shown in FIG. The construction girder 22 built under the rail line (RL) and erected at the rail line level is supported by the temporary abutment 21.
[0003]
As the construction procedure, a construction girder 22 is erected, excavated beneath the track, which is a construction site, and retaining piles 23 are cast on both sides thereof, and an underground structure using the concrete box 1 is constructed at the excavated location. And then backfill.
[0004]
Such a construction girder method is a prior art conventionally performed by those skilled in the art, and does not relate to the invention disclosed in the literature.
[0005]
[Problems to be solved by the invention]
Since the construction girder method is to temporarily construct a construction girder and excavate under the track to construct a concrete box at this location, a box building work will be performed after completion of the under-track construction, and Construction and box construction work cannot be performed simultaneously, and the construction period becomes longer. In addition, since the box construction work is performed in a narrow space below the construction girder, workability is not good and quality control is difficult.
[0006]
An object of the present invention is to solve the above-described disadvantages of the conventional example, and when constructing an underground structure under a construction girder, it is possible to simultaneously perform under-track construction and box construction work, thereby shortening the construction period. It is another object of the present invention to provide a method of constructing an underground structure which can improve workability and quality control in a narrow space under a construction girder without performing a box construction work.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention firstly provides a method of constructing an underground structure by erection of a construction girder, excavating under a track, and constructing an underground structure in an excavated portion, by installing a propulsion jack and propelling the underground structure. The gist of the present invention is that a starting table in which a guide member is embedded is constructed, and a reaction force guide member that can move forward following the propulsion of the underground structure by the propulsion jack is attached to the propulsion guide member.
[0008]
Secondly, the propulsion guide member is provided with an engagement portion for detachably engaging the reaction force guide member, and the engagement portion provided on the reaction force guide member is made to correspond to the extension of the propulsion jack. The gist of the invention is that it is detachably locked to the main body.
[0009]
Third, the propulsion guide member has a plurality of locking holes formed on the upper surface of the rail-shaped member for each stroke length of the propulsion jack, and the reaction force guide member has a substantially vertical reaction force plate and a lower portion of the reaction force plate. And a locking hook detachably inserted into the locking hole.
[0010]
According to the first aspect of the present invention, since the underground structure can be constructed at the place of the starting platform, the under-track construction and the box construction work can be performed simultaneously. The underground structure constructed on the starting table can be easily propelled and moved down the track by the propulsion jack, the propulsion guide member, and the reaction force guide member.
[0011]
According to the second aspect of the present invention, since the reaction force guide member can move forward with respect to the propulsion guide member in accordance with the extension stroke of the propulsion jack, a large reaction wall or the like is not built on the starting table. In addition, the underground structure can be reliably advanced.
[0012]
According to the third aspect of the present invention, the mounting and dismounting of the reaction force guide member with respect to the propulsion guide member can be easily performed by inserting and extracting the locking hooks locked in the locking holes, and the workability is good.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a starting point, which is a main part of an embodiment of the method of constructing an underground structure according to the present invention. FIG. 2 is a front view of the same, and the method of the present invention is shown in FIG. This is a method of constructing an underground structure with a concrete box 1 or the like so as to traverse underneath, and is a method of temporarily installing a construction girder 2 as shown in FIG. Supports construction girders 2.
[0014]
In the method of the present invention, as shown in FIG. 4, the starting table 4 is built in parallel with the work under the track for excavating below the work girder 2. As shown in FIGS. 1 and 2, the starting table 4 includes a propulsion guide member 7 buried in a starting table concrete 6 cast on the ground, and a reaction force guide member 8 detachably engaged with the propulsion guide member 7. , And the propulsion jack 9.
[0015]
The propulsion guide member 7 is made of, for example, an H-shaped steel, and serves as a locking portion with the reaction force guide member 8. A hole 10 is formed.
[0016]
The reaction force guide member 8 is also made of steel, and has a bottom plate having a locking hook 11 protruding from the lower surface thereof, a reaction force plate 12 erected substantially vertically at the front of the bottom plate, and a direction orthogonal to the reaction force plate 12. And a reinforcing plate 12a disposed above the bottom plate. The locking hook 11 is removably inserted into the locking hole 10. In this case, the locking hooks 11 protrude at two positions in the front-rear position, and two locking holes 10 are provided corresponding to the locking holes 11 for each stroke length of the propulsion jack 9.
[0017]
In order to propel the concrete box 1 under the construction girder 2 using such a starting table 4, the concrete box 1 is set on the propulsion guide member 7 at the place of the starting table 4 as shown in FIG. Then, a reaction force guide member 8 is attached to the propulsion guide member 7 at a position rearward of the concrete box 1 as shown in FIG.
[0018]
When the reaction force guide member 8 is attached to the propulsion guide member 7, the locking hook 11 provided on the reaction force guide member 8 is inserted into the locking hole 10 of the propulsion guide member 7 as shown in FIGS. 1 and 2. It is done by doing. Then, the propulsion jack 9 is set between the reaction force plate 12 of the reaction force guide member 8 and the rear part of the concrete box 1, and the propulsion jack 9 is extended by obtaining a reaction force from the reaction force plate 12. The concrete box 1 is extruded on the starting table 4. In this case, since the locking hook 11 is locked in the locking hole 10, the reaction force guide member 8 can be prevented from floating.
[0019]
When the concrete box 1 is advanced by one stroke length of the cylinder of the propulsion jack 9, the propulsion jack 9 is contracted and the locking hook 11 is replaced with the locking hole 10 at the front position to prepare for the next extension. By repeating this, the concrete box 1 is advanced by one stroke length.
[0020]
When the concrete box 1 is extruded to a predetermined position below the track 5 in this way, the construction girder 2 is removed as shown in FIG.
[0021]
As shown in FIGS. 7 to 9, two propulsion jacks 9 (rows A and B) are provided corresponding to the left and right positions of the concrete box 1, and the propulsion jacks 9 in row A are extended. When the concrete box 1 is pushed out, the cylinders of the propulsion jacks 9 in row B are simultaneously returned to prepare for the next extension, and the propulsion jacks 9 in row A and row B are alternately extended. It can be continuously propelled without.
[0022]
As shown in FIG. 11, the starting table 4 may have a structure in which the upper surface is protruded like a rail, and if the concrete box 1 is supported on the projecting portion 4a, the bottom of the concrete box 1 The contact area between the vehicle and the starting table 4 can be reduced, and the frictional resistance during propulsion can be reduced, and the propulsion becomes smooth.
[0023]
【The invention's effect】
As described above, the method of constructing an underground structure according to the present invention is such that, when an underground structure is constructed under a construction girder, a starting table is provided and pushed out by a propulsion jack installed here, and the reaction force is increased. Is obtained from the movable reaction force guide member, so that the work under the track and the construction of the box can proceed simultaneously, shortening the construction period, and using a small space under the construction girder. This eliminates the need for a body-building operation, thereby improving workability and improving quality control.
[Brief description of the drawings]
FIG. 1 is a side view of a starting point, which is a main part, showing an embodiment of a method for constructing an underground structure according to the present invention.
FIG. 2 is a front view of a starting point, which is a main part, showing an embodiment of the method of constructing an underground structure according to the present invention.
FIG. 3 is a vertical sectional side view of a construction location of an underground structure, showing an embodiment of the underground structure construction method of the present invention.
FIG. 4 is a vertical side view of a first step showing an embodiment of the method for constructing an underground structure according to the present invention.
FIG. 5 is a vertical sectional side view of a second step showing the embodiment of the method for constructing an underground structure according to the present invention.
FIG. 6 is a vertical sectional side view of a third step showing the embodiment of the method for constructing an underground structure according to the present invention.
FIG. 7 is a vertical sectional side view of a first step of expansion and contraction of a propulsion jack, showing an embodiment of the method of constructing an underground structure according to the present invention.
FIG. 8 is a vertical sectional side view of a second step of expansion and contraction of the propulsion jack, showing an embodiment of the method for constructing an underground structure according to the present invention.
FIG. 9 is a vertical sectional side view of a third step of expansion and contraction of the propulsion jack, showing an embodiment of the method for constructing an underground structure according to the present invention.
FIG. 10 is a vertical sectional front view showing an embodiment of the method for constructing an underground structure according to the present invention.
FIG. 11 is a longitudinal sectional front view of another example of the starting table showing the embodiment of the method of constructing an underground structure according to the present invention.
FIG. 12 is a vertical sectional front view of the construction girder method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Concrete box 2 ... Construction girder 3 ... Support pile 4 ... Starting table 4a ... Protrusion 5 ... Track 6 ... Starting table concrete 7 ... Propulsion guide member 8 ... Reaction force guide member 9 ... Propulsion jack 10 ... Lock hole 11 ... Retaining hook 12 ... Reaction plate 12a ... Reinforcement plate 21 ... Temporary abutment 22 ... Construction girder 23 ... Retaining pile

Claims (3)

In a method of constructing an underground structure in which a construction girder is erected and excavated under a track to construct an underground structure in an excavated portion, a propulsion jack is installed and a launch table in which a propulsion guide member is embedded is constructed, and the propulsion guide is constructed. A method of constructing an underground structure, characterized in that a reaction force guide member that can move forward following the propulsion of the underground structure by a propulsion jack is attached to the member. The propulsion guide member is provided with an engagement portion for detachably engaging the reaction force guide member, and the engagement portion provided on the reaction force guide member is detachably attached to the engagement portion so as to follow the extension of the propulsion jack. The method for constructing an underground structure according to claim 1, wherein the underground structure is locked. The propulsion guide member has a plurality of locking holes formed on the upper surface of the rail-shaped member for each stroke length of the propulsion jack. The reaction force guide member is provided at a substantially vertical reaction force plate and provided below the reaction force plate. The method for constructing an underground structure according to claim 1 or 2, wherein the method is formed by a locking hook detachably inserted into the locking hole.

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