JPH06158990A - Method of protective construction of method of caisson-body propulsive construction - Google Patents

Abstract

PURPOSE:To enable execution simply at low cost even at a place separate from a starting pile, and to enable correspondence easily even when a caisson body proceeds in a curved shape. CONSTITUTION:In a method of caisson-body propulsive construction, in which a first caisson body 1 having a hooded cutting edge 3 at a front end is installed, the first caisson body is propelled by a propulsive jack, second and subsequent caisson bodies 1 are mounted successively at the rear of the first caisson body 1, the caisson bodies 1 are propelled in the ground under the state of a coin and an underground structure is built, underground continuous walls 9 are carried out along the sides in the propulsive direction of the caisson bodies 1. The ends of horizontal pipe roofs 10 disposed so as to cross the propulsive direction of the caisson bodies are born by the underground continuous walls 9, and the caisson bodies 1 are propelled under the horizontal pipe roofs 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention installs a first box having a hood-shaped blade at its tip and uses a first jack for a propulsion jack.
The box body propulsion for constructing an underground structure by digging the box body, and arranging the second and subsequent box bodies behind the first box body in order and digging the box body into the ground in a tandem state. In the construction method,
This is related to the protective construction method used together.

[0002]

2. Description of the Related Art As mentioned above, an infinite self-propelled method as shown in FIG. 3 is known as one of the propulsion methods for pushing a concrete box into the ground to construct a tunnel-like underground structure. ing. As shown in Japanese Patent Publication No. 53-6453, a large number (three or more) of concrete boxes 1 are arranged,
A propulsion jack 2 is arranged between the boxes 1.

Further, a hood-shaped blade opening 3 is attached to the tip of the leading box 1, a PC steel wire 4 as a pulling member is arranged so as to penetrate all of the boxes 1, and the end thereof is provided. Fixing tool 5
And tow jack 6 are installed. Each box body 1 is provided with a hood-like skirt 7 at the rear end except for the rearmost one, and the skirt 7 is slidably engaged with the front end of the box body 1 continuing to the rear.

In this way, the portion of the blade opening 3 is excavated, and the stroke of the propulsion jack 2 provided between the box body 1 at the front and the box body 1 at the rear of the box body is extended and moved forward by a fixed amount, and the whole box is opened. If the body 1 moves forward by a certain amount, the same operation is repeated from the beginning. In that case, in order to advance the first box body 1 at the front, the fixing tool 5 and the towing jack 6 are made free, and the frictional resistance due to the own weight of the rear box body 1 and earth pressure is used as a reaction force to make the first box body 1 The propulsion jack 2 between the first and second boxes 1 is activated.

Next, the second box 1 is moved forward by the fixing device 5
And the tow jack 6 are fixed to the PC steel wire 4, the tow jack 6 is operated to tension the PC steel wire 4, and the first box 1 and the third box 1 are used as a reaction force to the second box. It is performed by the propulsion jack 2 between the first and third boxes 1.

When the third box 1 is moved forward, the first box 1 and the second box 1 are acted as reaction forces and the towing jack 6 is operated to pull the box.

In such a propulsion method, when excavating under the existing road or railway so as to traverse the box body, as shown in FIG. 4, in order to suppress the deformation of the ground including the settlement, A pipe roof 8 is arranged around the circumference of the pipe 1. As is well known, the protective work by the pipe roof 8 is formed by arranging steel pipes to be press-fitted into the ground side by side. The arrangement method is to arrange the steel pipes above the box body 1 in a horizontal row. As shown in the figure, the boxes 1 may be arranged in a gate shape so as to surround them.

[0008]

However, the protective work by the pipe roof 8 is performed when the steel pipes are arranged side by side to the side of the box 1 as shown in the figure, or when the box 1 is installed from the starting pit for starting the box. Can be inserted into the ground relatively easily to the lower steel pipe using this start pit, but if it is installed only on the way away from the start pit, the lower steel pipe cannot be installed unless it is dug to a considerable depth, so it is extremely It takes time and effort.

Further, in the case of construction in which the box body 1 is drawn in a curve, the steel pipe is arranged on the side of the box body 1 so as to extend in the traveling direction of the box body 1 according to the curvature of the curve. Is impossible. Therefore, in the case of such a curve construction, it is necessary to secure a large space between the box body 1 and the pipe roof 8 so as to allow a curve, and the number of lines increases accordingly, resulting in a high cost.

The object of the present invention is to solve the inconveniences of the above-mentioned conventional examples, to easily and inexpensively construct a place away from the starting pit, and to easily cope with the case where the box is curved. To provide a protection method.

[0011]

In order to achieve the above-mentioned object, the present invention installs a first box having a hood-shaped blade opening at its tip and digs the first box with a propelling jack, In the box propulsion construction method of constructing an underground structure by arranging the second and subsequent boxes sequentially behind the first box and digging the boxes into the ground in a tandem state, A continuous underground wall is constructed along the side of the propulsion direction, and the end of the horizontal pipe roof that is arranged so as to cross the promotion direction of the box is supported by this underground continuous wall. The purpose of the present invention is to make the underground continuous wall a wall body that is prepared by mixing a hardening liquid, such as cement milk or bentonite liquid, which is suitable for the purpose, with the soil in situ.

[0012]

According to the present invention as set forth in claim 1, the underground continuous wall can be constructed relatively easily by an excavator or the like arranged above the ground, and the distance and the shape of the curve can be freely set. The horizontal pipe roof, which is arranged so as to cross the propelling direction of the box body, bears the load sufficiently by having its end supported by this underground continuous wall. Further, since the lateral pipe roof can be arranged in a certain degree of direction as long as its end engages with the underground continuous wall, it is not easily restricted even when the pits for arranging are provided.

According to the present invention as set forth in claim 2, in addition to the above-mentioned function, the underground continuous wall can be constructed by the simplest method without material cost, and the construction can be further simplified. Become.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a protection method 1 of the box propulsion method of the present invention.
FIG. 2 is a front view showing the embodiment, and FIG.

The present invention is also an example of the case of the infinite self-propelled forward construction method as shown in FIG. 3, in which 1 is a concrete box. Although illustration is omitted, this box body 1 is provided with a hood-shaped blade opening at the tip of the top box body 1, and a PC steel wire as a pulling member is arranged so as to penetrate all the box bodies.
A fixing device and a tow jack are installed at the end. Each box body is provided with a hood-like skirt at the rear end except for the rearmost one, and the skirt is slidably engaged with the front end of the box body continuing to the rear.

In this way, the blade mouth is excavated and the stroke of the propulsion jack installed between the front box 1 and the box behind it is extended and moved forward by a fixed amount, so that all boxes are fixed. When the amount advances, the same operation is repeated from the beginning.

As shown in FIG. 2, when there is an existing road 12 and the box 1 is propelled under the road 12, the present invention is
The underground continuous wall 9 is constructed along the side of the box 1 in the propulsion direction. The underground continuous wall 9 is a wall body formed by mixing a hardening liquid, such as cement milk or bentonite liquid, adapted to the purpose with the soil in the original position.

As a construction method, an in-situ soil mixing method can be adopted, and when a soil is excavated by a special multi-screw kneading auger machine, a hardening liquid is projected from the tip of the excavating rod so that the hardening liquid is projected to the soil. At 1), mixing with in-situ soil, 1-element wall-shaped hole kneading and kneading is performed to create a soil cement wall in-situ. Then, the wall of each element is completely wrapped to form a continuous integral wall body. As described above, according to the in-situ soil mixing method, the underground continuous wall 9 can be easily constructed by installing the special multi-axis kneading auger machine on the ground without large excavation.

After that, the end of the horizontal pipe roof 10 which is arranged so as to cross the propelling direction of the box 1 is placed on the upper end of this underground continuous wall 9 or penetrated therethrough, so that Support the pipe roof 10.

In order to arrange this horizontal pipe roof 10,
As shown in FIG. 1, a pit 11 is appropriately formed, and a steel pipe which is a constituent material of the lateral pipe roof 10 may be press-fitted by a press-fitting machine (not shown) installed in the pit 11 as in the conventional case. In the figure
Reference numeral 13 is a reaction wall for press-fitting the horizontal pipe roof 10.

The underground continuous wall 9 can be adjusted in strength by changing the amount of cement according to the diameter and length of the horizontal pipe roof 10.
To penetrate this underground continuous wall 9, if necessary,
A core material may be installed in advance in addition to the penetrating portion to reinforce it.

Further, the inserting direction of the lateral pipe roof 10 is not particularly limited as long as it engages with the underground continuous wall 9, and it may be arranged along the advancing direction of the road 12 unlike the illustration, and the pit 11 may be arranged. The installation position can be selected relatively freely, and there is also a so-called cantilever type in which only one end of the horizontal pipe roof 10 is supported by the underground continuous wall 9.

In this way, the box 1 is a horizontal pipe roof.
The road 12 is protected by the lateral pipe roof 10, which is dug below 10.

Although the above embodiment has been described as being used for the infinite self-propelled forward construction method shown in FIG. 3, the protective construction method of the present invention can be applied to other propulsion construction methods and other similar construction methods.

[0025]

As described above, according to the protection method of the box body propulsion method of the present invention, the first box body having the hood-shaped blade at the tip is installed and the first box body is propelled by the propulsion jack. In the box body propulsion method in which the underground body structure is constructed by digging and installing the second and subsequent boxes in sequence behind the first box and digging the boxes in the vertical direction in the ground. It can be easily and inexpensively constructed even in a place away from the pit, and can be easily dealt with even when the box moves along a curve.

In particular, compared with the conventional case, the starting pit is not affected by the arrangement of the pipe roof such that it also serves as an insertion base of the pipe roof, the work is not congested, and the construction period and cost are reduced. be able to.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a protective construction method of a box propulsion construction method of the present invention.

FIG. 2 is a plan view showing one embodiment of a protective construction method of a box propulsion construction method of the present invention.

FIG. 3 is a side view showing a general example of an infinite self-propelled forward construction method.

FIG. 4 is a front view of a conventional protective worker.

[Explanation of symbols]

 1 ... Box 2 ... Propulsion jack 3 ... Blade 4 ... PC steel wire 5 ... Fixing tool 6 ... Towing jack 7 ... Skirt 8 ... Pipe roof 9 ... Underground continuous wall 10 ... Horizontal pipe roof 11 ... Pit 12 ... Road 13 ... Reaction wall

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Ikeda 1-3-15 Awaza, Nishi-ku, Osaka City, Osaka Prefecture Kashima Construction Co., Ltd. Osaka Branch (72) Inventor Kazuhiko Fujimoto 1-3-3 Awaza, Nishi-ku, Osaka City, Osaka Prefecture No. 15 Kashima Construction Co., Ltd. Osaka Branch (72) Inventor Toshio Funasako 1-3-3 Awaza, Nishi-ku, Osaka City, Osaka Prefecture Kashima Construction Co., Ltd. Osaka Branch

Claims (2)

[Claims] 1. A first box having a hood-shaped blade at the tip is installed, and the first box is dug with a propulsion jack, and the second box and the following are placed behind the first box. In the box body propulsion method of constructing an underground structure by sequentially installing the box body and digging the box body into the ground in a columnar state, construct a continuous underground wall along the side of the propulsion direction of the box body, A protective construction method for a box body propulsion method, characterized in that a horizontal pipe roof end arranged so as to cross the propelling direction of the box body is supported by the underground continuous wall, and the box body is dug under the transverse pipe roof. 2. The protection of the box propulsion method according to claim 1, wherein the underground continuous wall is a wall body formed by mixing a hardening liquid suitable for the purpose, such as cement milk or bentonite liquid, with soil in situ. Construction method.