JP3382183B2 - Construction method for underground structure and roof cylinder used therefor - 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 obstructing upper traffic when a large-scale underground structure is dug in the lower ground such as a railway or a road. The present invention relates to a method for constructing a product and a roof cylinder used for the method.

[0002]

2. Description of the Related Art To excavate a large number of underground structures in the lower ground such as railways and roads in the transverse direction, protective work is required to support upper traffic. Conventional steel pipes are used as such protective work. Although it is possible to install a pipe roof that is arranged in parallel horizontally, it is safe and reliable because it is performed simultaneously with the excavation of the underground structure without constructing the protection work of the underground structure that is excavated underground as a separate work. The following construction methods are known as those that can be constructed at low cost and can be constructed with a shallow soil cover.

As shown in FIG. 9, first, an earth retaining steel sheet pile 2 is driven beside an upper traffic 1 such as a railway, and a starting shaft 3 is formed.
The arrival pit 4 is constructed, and the press-fitting machine 5 is installed in the starting pit 3 to press the roof cylinder 6 toward the arrival pit 4.

The roof tubular body 6 is a box-shaped tubular body having a substantially square cross section made of a steel tube which is a long and integral body, and is formed continuously in the longitudinal direction via a side-to-side joint of a hull, and has a flat plate on the upper surface. With a friction cutter 7 consisting of one piece,
Side by side through the joint. As an example, this arranging method is appropriately selected according to the underground structure to be arranged in a one-letter shape (FIG. 12), a circle shape (FIG. 13), a box shape (FIG. 14), etc. as shown in FIGS.

Next, as shown in FIG. 10, a reaction wall 8 and an underground structure 9 made of a concrete box are set in the start pit 3, and the space between the reaction wall 8 and the underground structure 9 is pushed. A propulsion jack 10 is provided, 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 roof cylinder 6.

In the figure, 13 is a support member for the roof cylinder 6, 14 is a stop member for the friction cutter 7, which are provided on the starting pit 3 side, while a pedestal 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 roof cylinders 6 are sequentially pushed one by one, and the roof cylinders 6 are generally passed.
Is advanced, the small jack 12 is contracted, and the propulsion jack 10 is extended this time to advance the underground structure 9. 16 in the figure
Shows a strut interposed between the propulsion jack 10 and the underground structure 9 (see FIG. 11).

In this way, while alternately repeating the forward movement of the roof tubular body 6 and the forward movement of the underground structure 9, the roof tubular body 6 that has emerged in the reaching pit 4 is sequentially removed.

When the tip of the underground structure 9 reaches the reaching pit 4, the blade opening 11 and the like are removed and backfilling grout is appropriately performed to complete the construction.

The underground structure 9 may be constructed by suspending and connecting precast concrete boxes in the starting pit 3 one by one, or by placing concrete in the starting pit 3 to obtain the required length. May be added.

Regarding the method of advancing the underground structure 9,
A reaction wall and a center-hole type traction jack are provided on the side of the reaching pit 4 and a pulling member made of PC steel wire, one end of which is fixed to the underground structure 9, is pulled by this traction jack. There is also a construction method to pull in.

[0012]

As described above, according to the conventional method, the reaching pit is provided, and the tip of the long roof cylinder is pushed out and removed therefrom, depending on the conditions of the construction site. Conventionally, there is a building at the place where the reaching pit is built, or there are foundations of bridge piers, underground structures such as tunnels, and underground buried objects such as sewer pipes.
Alternatively, it may not be possible to secure a site even if such an obstacle does not exist, and in such a case, it is impossible to construct the reaching pit and the roof cylinder cannot be removed, which makes construction difficult.

The object of the present invention is to solve the inconveniences of the above-mentioned conventional examples, and it is possible to construct an underground structure even if the reach pit cannot be constructed due to an obstacle existing in the place where the reach pit is conventionally constructed. Another object of the present invention is to provide a method for constructing an underground structure which has good workability and can ensure safety during construction, and a roof cylinder used for the method.

[0014]

In order to achieve the above-mentioned object, the present invention is as follows. First, as a method of constructing an underground structure, a roof cylinder having a friction cut member disposed on an upper part is installed from a starting pit to a ground. Place the underground structure behind the roof cylinder that remains in the starting pit by press-fitting it in parallel and leaving the friction cut member with the friction cut steel material for reinforcement joined to the bottom of the friction cut plate in the ground. However, in the method of constructing an underground structure for excavating an underground structure, the roof cylinder is formed of a combined body in which short divided bodies are connected in a longitudinal direction, and the structure is used for a roof prior to excavation of an underground structure. Press only the cylinder into the place where the underground structure should be built, and then at the tip edge position of the underground structure, separate the roof cylinder composed of the joint from the rear split body and remove it sequentially. And underground structure While a space in front of the front end cutting edge position of, it is an Abstract that is boring underground structure under press propulsion jacks installed in the starting pit.

Secondly, as a roof cylinder used in the method of constructing an underground structure, the roof cylinder is freely separable in a lengthwise divided body, and the upper part in the lengthwise direction is pinned at the lower part. It consists of a combined body that is connected by bolts, and the length of each divided body in the length direction is formed to a length that can be separated and removed at the tip edge position of the underground structure, and each divided body is The main point is that the friction cut member is connected with a bolt at the rear position.

According to the first aspect of the present invention, while excavating the underground structure, the roof cylinder constituted by the combined body is separated from the rear divided body and sequentially removed at the tip edge position while excavating the underground structure. You can Therefore, the roof cylinder can be removed without providing the reaching pit, and the construction of the reaching pit can be performed even in a difficult or impossible place.

Further, in the state immediately after the roof cylinder is removed, the friction cut member receives earth pressure from above, and there is no member supporting it below, but below the friction cut plate is a reinforcing member. Since the friction cut steel materials are joined together, it is possible to prevent the friction cut plate from bending under the pressure from above. In addition, the friction cut steel material can protect the surrounding ground when excavating an underground structure composed of a rigid concrete box.

According to the second aspect of the present invention, the divided members each having a lengthwise length are separably connected to each other in the lengthwise direction. Each divided member has a length in the lengthwise direction. Since the structure is formed to have a length such that it can be separated and removed at the position of the tip blade, a short divided unit alone can be provided even if there is no reaching hole as in the case of the operation of claim 1, even in a small space at the position of the tip blade. If so, it can be removed, and as a result, the roof cylinder can be removed.

Further, in the roof tubular body, since the divided bodies which are connected to each other are connected to each other with the pin at the upper portion and the bolt at the lower portion,
The lower part, to which tensile force is applied by pressure from above, can be coped with by pulling it tightly with bolts, and the upper part, which only compressive force is applied, can be prevented from shifting, so it can be removed by connecting it with a pin. The ease of separation at the time of ensuring was secured.

Further, since each divided body of the roof cylinder needs to be press-fitted integrally with the friction cut member at the time of press-fitting, this is connected to the friction cut member by bolts, but separated and removed in units of divided bodies. At this time, the connecting position is set to the rear position with respect to the forward direction of the roof cylinder, so that the separating work can be performed near the blade of the underground structure, and the workability is good.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical sectional side view showing an embodiment of a method for constructing an underground structure of the present invention, FIG. 2 is a vertical sectional side view of a roof cylinder used in the constructing method of the present invention, and FIG. 3 is a front view of the same. In the figure, the same components as those of the conventional example shown in FIGS. 9 to 11 are designated by the same reference numerals.

Explaining the structure of the roof cylinder 6, it is composed of a combination of short divisions 6a, 6b ... 6n connected in the length direction. As shown in FIGS. 2 and 3, the connecting structure is provided with a flange 17 having a plurality of bolt holes in the lateral direction inside the lower part of the front and rear joining ends, and inside the both corners of the upper part, there is a rear part at the rear in the traveling direction. The pin 19 protruding toward the front side is provided with a locking hole 20 at the front portion in the traveling direction, into which the pin 19 is inserted.

Then, the front and rear ends of the front and rear divided bodies, for example, the divided bodies 6a and 6b, are butted against each other, and the bolts 18 are pushed through the bolt holes formed in the flange 17 so that the divided body 6 is formed.
The lower parts of a and 6b are connected, and the pin 19 is inserted into the locking hole 20 to connect the upper parts of the divided bodies 6a and 6b. The other divided bodies are similarly sequentially joined to form a long roof cylinder 6.

A friction cut member 21 is attached to the upper portion of the roof cylinder 6. The friction cut member 21 is composed of an upper friction cut plate 21a and a lower friction cut steel material 21b, the friction cut plate 21a is formed of a flat plate, the friction cut steel material 21b is formed of H-shaped steel, and the friction cut steel material 21b is formed. Are fixed to the divided bodies 6a of the roof cylinder 6 with bolts 22. As shown in FIG. 2, the fixing points are divided bodies 6a.
It is located at the rear of the traveling direction of.

A method for constructing an underground structure 9 using the roof cylinder 6 will be described with reference to FIGS. As shown in FIG. 1, the construction method of the present invention is constructed in a place where a reaching pit cannot be built due to the presence of an obstacle 23 such as an underground structure in the position of the reaching pit. Soil retaining steel sheet pile 2 is driven beside 1 and only start pit 3 is built.

As shown in FIG. 5, a press-fitting machine 5 is installed in the starting pit 3 so that a roof cylinder 6 and a friction cut member constituted by a combination of divided bodies 6a, 6b ... 6n.
21 is press-fitted into the construction site of the underground structure 9 in a gate shape as shown in FIG. In this case, since the obstacle 23 exists at the tip of the press-fitting of the roof tubular body 6 as described above, the roof tubular body 6 is located further forward than the place where the underground structure 9 is constructed.
Cannot be pressed. In this way, the roof tubular body 6 is propelled prior to the underground structure 9 made of the concrete box. In the figure, 24 indicates a roof beam.

When the roof cylinder 6 is press-fitted, a load due to earth pressure is applied from above to the roof cylinder 6 due to the coupling of the plurality of divided bodies 6a, and the lower part of each divided body 6a is rubbed downward. A pulling force in the pulling direction acts, but this pulling force can be dealt with by connecting the bolts 18 because the lower portions of the divided bodies 6a ... Further, a compressive force is applied to the upper part, but this can be dealt with by the connection by the pin 19, and the displacement of the upper part can be prevented by the connection by the pin 19.

Next, as shown in FIG. 6, a reaction wall 8, a cross girder frame 25, and a thrust jack 10 are installed in the starting pit 3, and the blade portion 11 at the tip of the underground structure 9 is attached to the roof cylinder. Positioned at the rear part of the body 6, a reaction force is taken by the reaction force wall 8 to extend the original pushing propulsion jack 10 to start excavation of the underground structure 9.

At this time, as shown in FIG. 7, the rearmost divided body 6a of the roof cylinder 6 located at the portion of the blade opening 11 is separated from the other divided body 6b located at the front thereof. Then, the underground structure 9 is advanced by the amount of the space generated by the removal.

The method of separating the divided body 6a from the divided body 6b in front of it is to remove the lower bolt 18 and the upper pin 19 connecting the divided bodies 6a and 6b in the front and rear, and to separate the divided body 6a. This is performed by removing the bolt 22 that is connected to the friction cut steel material 21b. In this case, since the connecting portion by the bolt 22 is located at the rear portion in the traveling direction of the divided body 6b, it is easily accessible and easy to work.

Even if the divided body 6a is removed, the friction cut member 21 is left above the place where the divided body 6a existed until then, and a space below the friction cut member 21 is formed by removing the divided body 6a. Become. Therefore, the load such as earth pressure from above is supported by the friction cut member 21 independently.
The friction cut plate 21a is joined to the friction cut steel material 21b under the friction cut plate 21a to secure its strength by its rigidity, so that it is not bent by a load from above.

When the underground structure 9 is dug into the space formed between the front and the divided body 6b by removing the divided body 6a, when the underground structure 9 is dug around, The effect on the ground is friction cut steel 21
It is protected by the rigidity of b.

In this way, the underground structure 9 is excavated while sequentially removing the divided bodies 6a ... Of the roof cylinder 6 constituted by the divided bodies 6a. (See FIG. 8). Therefore, the roof tubular body 6 can be removed without providing the reaching pit, and the underground structure 9 can be built in a predetermined place.

When the tip of the underground structure 9 reaches the front of the obstacle 23, the blade opening 11 and the like are removed, and backfilling grout is appropriately performed in the gap of the friction cut steel material 21b to complete the construction. .

Although the above embodiment has been described for the case where the reaching pit cannot be constructed due to the obstacle 23 such as the foundation of the pier, the present invention is not limited to this, and can be applied to the case where the tunnels are connected to each other. .

[0036]

As described above, the method for constructing an underground structure of the present invention and the roof cylinder used for the same have been achieved in the conventional case because there is an obstacle at the place where the pit is constructed. Even if it is not possible to build, the roof cylinder is composed of a separable combined body of short divisions, so while excavating the underground structure, the divisions are sequentially separated and removed from the front at the location of the blade edge. Therefore, it becomes possible to construct an underground structure in a place where a reaching pit cannot be constructed, and the workability is good and the safety during construction can be secured.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional side view of a roof cylinder used in the method for constructing an underground structure of the present invention.

FIG. 3 is a front view of a roof cylinder used in the method for constructing an underground structure of the present invention.

FIG. 4 is a front view showing an embodiment of a method for constructing an underground structure of the present invention in a state in which roof cylinders are arranged.

FIG. 5 is a vertical sectional side view of a first step showing the embodiment of the method for constructing an underground structure of the present invention.

FIG. 6 is a vertical sectional side view of a second step showing the embodiment of the method for constructing an underground structure of the present invention.

FIG. 7 is a vertical sectional side view of a third step showing the embodiment of the method for constructing an underground structure of the present invention.

FIG. 8 is a vertical cross-sectional side view of a fourth step showing the embodiment of the method for constructing an underground structure of the present invention.

FIG. 9 is a vertical sectional side view of a first step of a conventional method for constructing an underground structure.

FIG. 10 is a vertical sectional side view of a second step of the conventional method for constructing an underground structure.

FIG. 11 is a vertical sectional side view of a third step of the conventional method for constructing an underground structure.

FIG. 12 is a front view showing a first example of an array state of cylindrical bodies.

FIG. 13 is a front view showing a second example of an array state of cylindrical bodies.

FIG. 14 is a front view showing a third example of an array state of cylindrical bodies.

[Explanation of symbols]

1 ... Upper traffic 2 ... Soil retaining steel sheet pile 3 ... Starting pit 4 ... Reaching pit 5 ... Pressing machine 6 ... Roof cylinders 6a, 6b ... 6n ... Dividing body 7 ... Friction cutter 8 ... Reaction wall 9 ... Underground structure 10 ... Propulsion jack 11 ... Blade 12 ... Small jack 13 ... Support material 14 ... Fixing member 15 ... Bed 16 ... Strut 17 ... Flange 18 ... Bolt 19 ... Pin 20 ... Locking hole 21 ... Friction cut member 21a ... Friction cut Plate 21b ... Friction cut steel 22 ... Bolt 23 ... Obstacle 24 ... Receiving beam 25 ... Double girder frame

Claims (2)

(57) [Claims] 1. A roof cylinder having a friction cut member disposed on an upper portion thereof is press-fitted into the ground from a starting pit to be arranged in parallel,
An underground structure is placed behind the roof cylinder that remains in the launch pit, and the underground structure is excavated while leaving the friction cut member, which is combined with the friction cut steel material for reinforcement, under the friction cut plate in the ground. In the method of constructing an underground structure, the roof cylinder is configured by a combined body in which short divided bodies are connected in the lengthwise direction, and only the roof cylinder has an underground structure prior to excavation of the underground structure. Press into the place where it should be constructed, then at the tip edge position of the underground structure, separate the roof cylinder composed of the combined body from the rear split body and remove it sequentially, A method for constructing an underground structure, which comprises digging an underground structure with a pushing jack installed in a starting pit while securing a space in front of a mouth position. 2. A roof cylinder having a friction cut member arranged on the upper side thereof is press-fitted into the ground from a starting pit to be arranged in parallel,
A roof cylinder used in a method of constructing an underground structure in which an underground structure is placed in the rear part of the roof cylinder remaining in the starting pit and the friction cut member is left in the ground to advance the underground structure. The roof cylinder is composed of a combined body in which a divided body which is short in the longitudinal direction is separably separated, and an upper portion in the longitudinal direction is connected with a pin and a lower portion is connected with a bolt. Is formed to a length that allows separation and removal at the tip edge position of the underground structure, and each divided body is connected to the friction cut member and bolts at the rear position with respect to the forward direction of the underground structure. Roof cylinder used in the construction method of.