JP2808426B2 - How to build underground structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground structure which can be constructed without hindrance to upper traffic when a large underground structure such as a railway or a road is excavated in a transverse direction. It relates to a method of constructing an object.

[0002]

2. Description of the Related Art In order to excavate underground structures of a large number of members in the underground such as railways and roads in the transverse direction, protective works for supporting upper traffic are required. Although it is possible to provide a pipe roof that is parallel to the horizontal, etc., it is safe and reliable because the protective work of the underground structure to be excavated underground is not performed as a separate work, but simultaneously with the excavation of the underground structure The following construction methods are known as those which can be constructed at low cost and can be constructed with shallow earth covering.

As shown in FIG. 4, a steel retaining sheet pile 2 is placed beside an upper traffic 1 such as a railway to construct a starting pit 3 and a reaching pit 4, and press-fit into the starting pit 3. The roof cylinder 6 is press-fitted toward the reaching pit 4.

The roof cylinder 6 is a box-shaped cylinder having a substantially square cross section made of a steel pipe, formed continuously in the longitudinal direction via a hook-shaped joint on a side surface, and provided with a friction cutter 7 on an upper surface. The required length can be buried by sequentially connecting in the length direction, and furthermore, it is arranged side by side through a joint.
This arrangement is, for example, a one-character type as shown in FIG.

Next, as shown in FIG. 5, a reaction wall 8 and an underground structure 9 made of a concrete box are set in the starting pit 3, and a propulsion jack 10 is provided between the reaction wall 8 and the underground structure 9.
Is provided at the tip of the underground structure 9, and a small jack 12 is interposed between the tip of the underground structure 9 and the roof cylinder 6.

In FIG. 1, reference numeral 13 denotes a support member for the roof cylinder 6, and reference numeral 14 denotes a stopper for the friction cutter 7, which is provided on the starting shaft 3 side, while a receiving stand 15 is provided on the reaching shaft 4 side.

The small jack 12 is extended to push the roof cylinders 6 one by one while leaving the friction cutter 7 with the underground structure 9 as a reaction force. , This time promotion jack 10
To extend the underground structure 9. In the figure, reference numeral 16 denotes a strut interposed between the propulsion jack 10 and the underground structure 9.

[0008] In this way, the roof cylinders 6 that have come out to the reaching pit 4 are sequentially removed while the advance of the roof cylinder 6 and the advance of the underground structure 9 are alternately repeated.

Then, when the tip of the underground structure 9 reaches the reaching pit 4, the cutting edge 11 and the like are removed and backfill grouting is performed as appropriate to complete the construction.

The underground structure 9 may be connected by suspending a precast concrete box in the starting pit 3 one by one or by placing concrete in the starting pit 3. May be added.

[0011] Further, regarding the method of moving the underground structure 9,
A reaction wall and a center-hole type traction jack are provided on the reaching pit 4 side, and a traction member made of a PC steel wire having one end fixed to the underground structure 9 is pulled by the traction jack. There is also a construction method to draw in.

[0012]

In the method of propelling the roof cylinder 6 and the underground structure 9 with the rear jack, it is necessary to provide the reaction wall 8 and the propulsion jack 10 on the starting pit 3 side.
Also, in the construction method in which the underground structure 9 is drawn from the reaching pit 4 side with a PC steel wire, it is necessary to provide a reaction wall on the reaching pit 4 side,
In either case, a reaction wall will be installed on the starting pit 3 side or the reaching pit 4 side, and the reaction force width necessary for propulsion and traction must be secured, and the place where construction is possible is limited. .

An object of the present invention is to solve the inconvenience of the prior art, and to provide a method for constructing an underground structure in which a roof cylinder is advanced and a plurality of subsequent underground structures are excavated. It is not necessary to install a reaction wall for propelling or towing each underground structure with a jack, and to provide a method of constructing an underground structure that can be constructed even if the space on the start pit side or the arrival pit side is small. It is in.

[0014]

According to the present invention, in order to achieve the above object, a roof cylinder is horizontally pressed into a ground from a starting pit and is arranged in parallel with the roof cylinder. In a method of constructing an underground structure in which an underground structure is provided, and a roof cylinder is advanced and a plurality of subsequent underground structures are excavated, the underground structure is provided between the roof cylinder and the underground structure, and A propulsion jack is interposed between the underground structures, and a traction jack is provided at the last underground structure. The propulsion jack between the roof cylinder and the underground structure is extended by the reaction with the object and the roof cylinder is advanced, and then the foreground underground structure is reacted by the underground structure behind it. To extend the propulsion jack between the underground structures and excavate it. As for the underground structures, the excavation jack is extended to excavate sequentially while taking the reaction force at the underground structures located at the rear, and the reaction force is taken at the foremost underground structure at the rearmost underground structure. The gist is to pull the steel wire into the reaching pit side by using a towing jack to reach the pit.

According to the first aspect of the present invention, the underground structure and the roof cylinder other than the rearmost portion take a reaction force from the rear underground structure and advance with the propulsion jack, and the rearmost underground structure. Takes a reaction force from the foreground underground structure and pulls it toward the arriving pit with a pulling member such as a PC steel wire by a pulling jack. Therefore, the reaction force for advancing can be obtained from each underground structure, so that there is no need for a reaction wall for taking the reaction force.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical sectional side view of a first step showing an embodiment of a method for constructing an underground structure according to the present invention. In the figure, the same reference numerals are used for the same components as those in the conventional example shown in FIGS. Is attached.

As shown in FIG. 1, a construction method according to the present invention also includes a steel sheet pile 2 placed beside an upper traffic 1 such as a railway to construct a starting pit 3 and a reaching pit 4. And the roof cylinder 6 is press-fitted toward the reaching pit 4 with this,
An underground structure 9 composed of a roof cylinder 6 and a concrete box
The underground structure 9 made of a concrete box is divided into a plurality of parts.

A propulsion jack 17 is interposed between the roof cylinder 5 and the foreground underground structure 9.
The propulsion jacks 18a, 18b are also provided between the plurality of underground structures 9.
And a traction jack 19 is provided in the rearmost underground structure 9, and the traction member, for example, a PC steel wire 20 is fixed to the fixing tool 21.
Then, it is fixed to the underground structure 9 at the forefront.

In order to advance the underground structure 9 as described above, as shown in FIG. 2, the foremost underground structure 9 takes a reaction force to extend the propulsion jack 17 and advance the roof cylinder 6 forward. Then, the foreground underground structure 9 is dug. In this case, the propulsion jack 18a is extended and the propulsion jack 17 is contracted by taking a reaction force by the underground structure 9 behind it.

The rearmost underground structure 9 takes a reaction force at the foreground underground structure 9 to generate a P by a towing jack 19.
The steel wire 20 is drawn into the reaching shaft 4 side.

In this way, the roof cylinder 6 and the plurality of underground structures 9 are subjected to a reaction force with the rear underground structure 9 while the propulsion jacks 17, 18a. 6 and a plurality of underground structures 9 are sequentially excavated.

When one piece of the roof cylinder 6 comes out to the arrival shaft 4, it is divided in the length direction, separated as it is in the horizontal direction, and lifted in a horizontal state as shown in FIG. Remove sequentially.

Then, when the tip of the underground structure 9 reaches the reaching pit 4, the cutting edge 11 and the like are removed, and backfill grout is performed as appropriate to complete the construction.

[0024]

As described above, the method of constructing an underground structure according to the present invention provides a method of constructing a roof cylinder and a plurality of subsequent subterranean structures which are preceded by a roof cylinder. Multiple underground structures are excavated by taking reaction force from other underground structures, so there is no need to install reaction walls at the start pit or the reach pit, and sufficient space is secured at the start pit or the reach pit Construction is possible even if it is not possible.

[Brief description of the drawings]

FIG. 1 is a vertical side view of a first step showing an embodiment of a method for constructing an underground structure according to the present invention.

FIG. 2 is a vertical sectional side view of a second step showing an embodiment of the method for constructing an underground structure according to the present invention.

FIG. 3 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. 4 is a longitudinal sectional side view of a first step of a conventional method of constructing an underground structure.

FIG. 5 is a vertical sectional side view of a second step of the conventional method of constructing an underground structure.

FIG. 6 is a vertical sectional side view of a third step of the conventional method of constructing an underground structure.

FIG. 7 is a front view showing an example of an arrangement state of cylinders.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper traffic 2 ... Earth retaining sheet pile 3 ... Starting pit 4 ... Destination pit 5 ... Press-fitting machine 6 ... Roof cylinder 7 ... Friction cutter 8 ... Reaction wall 9 ... Underground structure 10 ... Propulsion jack 11 ... Cutting edge 12 ... Small jack 13 ... Support material 14 ... Stopping member 15 ... Receiving stand 16 ... Strut 17 ... Propulsion jack 18a, 18b ... Propulsion jack 19 ... Towing jack 20 ... PC steel wire 21 ... Fixing tool

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 9/04 E21D 9/06 311

Claims (1)

(57) [Claims] 1. A roof cylinder is horizontally pressed into the ground from a starting pit to be parallel, and an underground structure is disposed behind a roof cylinder remaining in the starting pit. In the method of constructing an underground structure in which a plurality of divided underground structures are excavated, a propulsion jack is interposed between the roof cylinder and the underground structure, and between the plurality of underground structures, and A traction jack is installed in the underground structure of the above, and the traction member such as PC steel wire is fixed to the foreground underground structure with the fixing tool, and the foreground underground structure takes a reaction force and the roof cylinder and the underground structure The propulsion jack between the objects is extended to advance the roof cylinder, and then the foreground underground structure reacts with the underground structure behind it to extend the propulsion jack between the underground structures. Excavated, and then multiple underground structures are located behind each The underground structure is excavated sequentially by elongating the propulsion jack while taking a reaction force, and for the last underground structure, the reaction force is taken at the foreground underground structure and the tow jack is used to pull the PC steel wire to the arriving pit side. A method of constructing an underground structure, characterized in that the structure is excavated by being retracted.