JPH09287389A - Constructing method of subsurface structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve directivity at a time when a cylinder body for a box- shaped roof is buried, and to enhance even workability and shorten even the term of works. SOLUTION: In this constructing method of a subsurface structure, cylinder bodies 6 for box-shaped roofs are pressed in horizontally and arranged in parallel in the ground between a departure shaft and an arrival shaft, the subsurface structure is disposed at the body rear sections of the cylinders 6 for the box- shaped roofs remaining in the departure shaft, and the cylinder bodies 6 for the box-shaped roofs and the subsurface structure are propelled. All of a required number of the cylinder bodies 6 for the box-shaped roofs are arranged in parallel in the departure shaft at that time, and all cylinder bodies 6 for the box-shaped roofs are propelled simultaneously while the facings of the adjacent cylinder bodies 6 for the box-shaped roofs are formed at double levels so as not to be placed on the same surface.

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 a large number of underground structures made of reinforced concrete in the lower ground such as railways and roads in a transverse direction, a protective work is required to support upper traffic. It is possible to install a pipe roof that horizontally arranges steel pipes, etc., but it is safe and reliable because it is performed simultaneously with the excavation of the underground structure without constructing a protective work for the underground structure to be excavated underground as a separate work. In addition, the following construction methods are known as those that can be constructed at low cost and have a shallow soil cover.

[0003] As shown in FIG. 4, as shown in FIG. 4, a retaining pile 2 is cast beside an upper traffic 1 such as a railway to construct a starting pit 3 and a reaching pit 4, and a press-fitting machine 5 is placed in the starting pit 3. It is installed and the box-shaped roof cylinder 6 is pressed into the reaching shaft 4 to form a roof as a protective work.

FIG. 7 is a front view of the box-shaped roof cylinder 6.
It is a box-shaped cylinder having a substantially square cross-section made of a steel pipe, and a male joint 6a in which hook-shaped constituent members are arranged outward on a side surface, and a female joint 6b arranged inward are continuously formed in the longitudinal direction. The friction cutter 7 made of a flat plate is mounted on the upper surface.

The box-shaped roof cylinder 6 is composed of one unit cylinder.
As shown in FIG. 9, a joint flange 6c is formed at the end, and the joint flanges 6c are fastened together with bolts and nuts 19 to add one piece at a time in the longitudinal direction to start the shaft. One of the required lengths (the center one in the example shown in FIG. 9) from 3 to the reaching shaft 4 is buried, and the first buried in this way is connected to the first via the joints 6a and 6b in the lateral direction. However, the second line (in the example shown in FIG. 11, the right side is the second line with respect to the first line at the center is the second line), the third line,...

The press-fitting machine has an extruding mechanism of the cylinder 6 with a jack or the like and an internal excavation mechanism of the cylinder 6 with an auger or the like.

As shown in FIGS. 11 to 13, the cylinders 6 are arranged in a one-letter type (FIG. 11), a gate type (FIG. 12), a box type (FIG. 13) or the like according to an underground structure to be installed later. Selected as appropriate.

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.
And a blade 11 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 box-shaped roof cylinder 6.

In the figure, reference numeral 13 denotes a support member for the box-shaped roof cylinder 6;
Are stop members for the friction cutter 7, which are provided on the starting pit 3 side, and on the other hand, a receiving stand 15 is provided on the reaching pit 4 side.

While the small jack 12 is extended and the underground structure 9 is used as a reaction force to leave the friction cutter 7, the box-shaped roof cylinders 6 are sequentially pushed one by one, and all the box-shaped roof cylinders 6 are set in a line. After moving forward, the small jack 12 is contracted and the propulsion jack 10 is extended this time to advance the underground structure 9. In the figure, reference numeral 16 denotes a strut interposed between the propulsion jack 10 and the underground structure 9.

In this manner, while the advance of the box-shaped roof cylinder 6 and the advance of the underground structure 9 are alternately repeated, one unit piece of the box-shaped roof cylinder 6 is placed in the arrival shaft 4 as shown in FIG. When the minute is completely released, the fastening between the joint flanges 6c by bolts and nuts 19 is released, and the joint flanges 6c are split in the length direction.
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 grouting is performed as appropriate to complete the construction.

The underground structure 9 may be constructed such that a precast concrete box is sequentially suspended in the starting pit 3 to be connected thereto, or concrete is cast in the starting pit 3 to a required length. May be added.

As for the method of propelling the underground structure 9, a reaction wall and a center-hole type traction jack are provided on the side of the reaching shaft 4, and one end is fixed to the underground structure 9. By pulling a traction member made of steel wire with this traction jack, the underground structure 9 can be pulled in from the reaching pit 4 side.

[0015]

As described above, the box-shaped roof tubular body 6 is connected to the required length in such a manner that it is sequentially penetrated from the starting pit 3 to the reaching pit 4 one by one. The tubular body 6 will be propelled by using the already buried tubular body 6 as a guide. However, since the tubular body 6 that serves as a guide in the propulsion direction does not exist for the first one, the propulsion direction is often inaccurate. . If there is a large error in the directionality of the first cylindrical body 6, the embedding may be redone and the workability is poor.

For this reason, an error also occurs in the directionality of the cylinder 6 which is sequentially propelled later with reference to the first cylinder 6, and the accumulated error becomes large.

Further, as for the second and subsequent cylinders 6, the cylinder 6 serving as a guide is only one of the adjacent cylinders 6 buried in advance, and the direction is regulated only from one side. Errors are likely to occur from the point of view as well.

An object of the present invention is to eliminate the disadvantages of the prior art, to improve the directionality of embedding a box-shaped roof cylinder,
It is an object of the present invention to provide a method of constructing an underground structure capable of improving workability and shortening a construction period.

[0019]

In order to achieve the above-mentioned object, the present invention horizontally press-fits a box-shaped roof cylinder into the ground between the starting pit and the reaching pit and makes them parallel to each other, and remains in the starting pit. In the method of constructing an underground structure, in which an underground structure is placed in the rear of the box roof cylinder and the box roof cylinder and the underground structure are propelled, all of the required number of box roof cylinders are started. Proximating all of the box-shaped roof cylinders at the same time by arranging them in parallel with each other and forming them in different steps so that the face blades of the adjacent box-shaped cylinders are not located on the same plane. The roof cylinders are staggered by shifting the pitch by one stroke so that the face does not lie on the same plane, and are alternately propelled one stroke at a time, and the required number of box-shaped roof cylinders are The face is not located on the same plane by shifting the pitch by one stroke Sea urchin and different levels formed, it is an Abstract that promote alternately simultaneously working face is collectively between those every other row of the same surface.

According to the first aspect of the present invention, by advancing all of the box-shaped roof cylinders to be buried between the start pit and the arrival pit at the same time, the adjacent cylinders serve as guides for each other. Since there are cylinders that serve as guides on both sides other than the cylinders at the ends, the cumulative error in the propulsion direction is reduced and the directionality is improved.

[0021] Even if the entire box-shaped roof cylinder is simultaneously propelled, the face can be prevented from collapsing because the face is formed stepwise for each cylinder so as not to be located on the same plane.

According to the second aspect of the present invention, in addition to the above-mentioned action, the adjacent box-shaped roof cylinders are alternately propelled one stroke at a time by shifting the pitch by one stroke, and thereby a plurality of cylinders are sequentially propelled. Even if the whole body is propelled at the same time, the press-fitting machines need only be sequentially set in the adjacent cylinders, so that the number of press-fitting machines to be installed need not be particularly increased. In this case, it takes particularly time and labor to relocate the press-fitting machine to the adjacent cylinder body, but the directionality is improved and the time and labor required for re-embedding the cylinder body and correcting the direction are reduced. Therefore, the workability is improved as a whole process.

According to the third aspect of the present invention, in addition to the above-mentioned action, a plurality of press-fitting machines are installed and the cutting faces having the same plane every other row are collectively and alternately propelled simultaneously. The entire construction period can be shortened.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of the method for constructing an underground structure according to the present invention, and FIG. 2 is a front view of the same, showing an example of the box-shaped roof cylinder 6 used in the method of the present invention with reference to FIG. Then, as shown in FIGS. 7 and 8, the basic configuration is a box-shaped roof cylinder having a substantially square cross section made of steel pipe, and a joint flange 6c is formed at an end.

A pair of inward hook-shaped engaging pieces 17 having a predetermined length are provided as joints on one of the connecting side surfaces so as to project in the lengthwise direction.
A pair of outward hook-shaped engaging pieces 18 that are fitted to the inward hook-shaped engaging pieces 17 are provided as joints on the other connecting side surface.

Next, the construction method will be described. The construction method itself is the same as the conventional construction method described above with reference to FIGS. 5 to 7, as shown in FIG. 5, by placing the earth retaining pile 2 on the side of the upper traffic 1 such as a railway to construct the starting pit 3 and the reaching pit 4. Then, a press-fitting machine 5 having an extruder such as a jack and an internal excavation mechanism for the cylinder 6 such as an auger is installed in the starting pit 3 so that the box-shaped roof cylinder 6 is directed toward the arrival pit 4. Press fit.

In this case, as shown in FIG. 2, all the plurality of box-shaped roof cylinders 6 to be press-fitted and buried are set in parallel with the starting pit 3. In this state, the adjacent hooks 17 and the outward hooks 18 are fitted together and connected to each other as shown in FIG.

Then, every other one of the plurality of box-shaped roof cylinders 6 arranged in parallel is extruded by one stroke, and as shown in FIG. 1, the cutting face 20 is formed stepwise so as not to be located in the same plane. In order to maintain the state in which the pitch is shifted by the stroke, the press-fitting machine 5 is sequentially recombined with the adjacent tubular bodies 6, and the adjacent tubular bodies 6 for the box-shaped roof are alternately extruded one stroke at a time, so that a plurality of the box-shaped roofs are formed. The cylinder body 6 as a whole is propelled at the same time.

At this time, the wrap length of the inward hook-shaped engagement piece 17 and the outward hook-shaped engagement piece 18 is determined by the length of the adjacent box-shaped roof tubular body 5.
Is set longer than the length by which one stroke is advanced, even if only the adjacent box-shaped roof cylinder 6 advances, the fitting is not disengaged, and all fittings are maintained while always maintaining the fitted state. The box-shaped roof cylinder 6 moves forward, and the other cylinders 6 except for the box-shaped roof cylinder 6 located at the end portion have the cylinders 6 arranged in parallel on both sides. Is a guide,
Directivity is ensured, and bending in the propulsion direction is reduced, and accumulated errors are reduced.

As a method of propelling the plurality of box-shaped roof cylinders 6, as described above, one press-fitting machine 5 adjoins adjacent cylinders 6.
It is not limited to the method of extruding alternately, and a plurality of press-fitting machines 5 are prepared, and every other one of the plurality of cylinders 6 is set, and the cylinders 6 arranged in the even positions and the odd positions are arranged. It is also possible to collectively extrude the arranged cylindrical bodies 6 and alternately, and in this case, the construction period can be shortened. In addition, the order of pushing the cylindrical body 6 may be any order as long as the face 20 is not flush. Further, the method of the present invention can be applied to the case where the box-shaped roof tubular body 6 is manually dug and the case where the box-shaped roof tubular body 6 is mechanically dug.

Further, the advancing of the box-shaped roof tubular body 6 and the advancing of the underground structure 9 are alternately repeated while simultaneously reaching the pit 4
The present method can be applied to both the method of pushing forward to the side and the method of starting the advance of the underground structure 9 after the box-shaped roof cylinder 6 reaches the reaching shaft 4 side.

Even if a plurality of cylinders 6 are simultaneously pushed out as described above, the adjacent cylinders 6 are
Since the face 20 between the two faces is not positioned on the same plane due to a difference in level, collapse of the face 20 can be prevented.

[0033]

As described above, according to the method of constructing an underground structure of the present invention, all the box-type roof cylinders to be buried between the starting pit and the reaching pit are simultaneously propelled, so that the adjacent The cylindrical bodies serve as guides, and since there is a cylindrical body serving as a guide on both sides other than the end cylindrical bodies, the accumulated error in the propulsion direction is reduced and the directionality is improved.

Even if all of the box-shaped roof cylinders are propelled at the same time, since the face is formed in different steps for each cylinder so that they are not located on the same plane, collapse can be prevented.

Further, by advancing the adjacent box-shaped roof cylinders one stroke at a time by shifting the pitch by one stroke alternately, even if a plurality of cylinders are simultaneously propelled at the same time, they are press-fitted. Since the machines may be sequentially set in the adjacent cylinders, the number of press-fitting machines to be installed need not be particularly increased.
In this case, it takes particularly time and labor to relocate the press-fitting machine to the adjacent cylinder body, but the directionality is improved and the time and labor required for re-embedding the cylinder body and correcting the direction are reduced. Therefore, the workability is improved as a whole process.

Further, if a plurality of press-fitting machines are installed and the cutting faces are arranged in a row on the same plane and are alternately propelled at the same time, the construction period of the whole process can be shortened.

[Brief description of drawings]

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

FIG. 2 is a front view showing an embodiment of the method for constructing an underground structure according to the present invention.

FIG. 3 is a front view of a box-shaped roof cylinder used in the method of constructing an underground structure according to the present invention.

FIG. 4 is a side view showing a first step of a method for constructing an underground structure.

FIG. 5 is a side view showing a second step of the method for constructing an underground structure.

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

FIG. 7 is a vertical sectional front view showing an example of a box-shaped roof cylinder.

FIG. 8 is a partial perspective view showing an example of a box-shaped roof cylinder.

FIG. 9 is a front view showing a first step of an arrangement procedure of a box-shaped roof cylinder in the method for constructing an underground structure.

FIG. 10 is a front view showing a second step in the procedure for disposing the box-shaped roof cylinder in the method of constructing an underground structure.

FIG. 11 is a front view showing a first example of an arrangement state of the box-shaped roof cylinders.

FIG. 12 is a front view showing a second example of the arrangement of the box-type roof cylinders.

FIG. 13 is a front view showing a third example of the arrangement state of the box-shaped roof cylinders.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper traffic 2 ... Soil pile 3 ... Starting pit 4 ... Reaching pit 5 ... Press-fitting machine 6 ... Box-type roof cylinder 6a, 6b ... Joint 6c ... Joint flange 7 ... Friction cutter 8 ... Reaction wall 9 ... Underground structure Object 10… Propulsion jack 11… Cutting hole 12… Small jack 13… Support material 14… Stopping member 15… Cradle 16… Strut 19… Bolt and nut 20… Face

Claims (3)

[Claims] 1. A box-shaped roof cylinder body is horizontally press-fitted into the ground between a starting pit and a reaching pit in parallel, and an underground structure is provided at the rear of the box roof cylinder body remaining in the starting pit. Then, in the method of constructing an underground structure for propelling a box-shaped roof cylinder and an underground structure, all of the required number of box-shaped roof cylinders are arranged in parallel in the starting pit, and adjacent box-shaped roof cylinders are arranged. A method for constructing an underground structure, which comprises propelling all of the box-shaped roof cylinders at the same time while forming them in different steps so that the face of the body is not located on the same plane. 2. The underground structure according to claim 1, wherein adjacent box-shaped roof cylinders are formed in a staggered manner so that the face is not located on the same plane by shifting the pitch by one stroke, and alternately propelling them one stroke at a time. How to build things. 3. A required number of a plurality of box-shaped roof cylinders are formed in a staggered manner so that the face blades are not located on the same plane by shifting the pitch by one stroke, and the face faces are arranged on a line every other row. The method for constructing an underground structure according to claim 1 or 2, wherein the two structures are alternately and simultaneously propelled.