JPS607119B2 - Tunnel construction method using mobile center - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a construction method for constructing the side walls and upper floors of underground tunnels having a simple cross-sectional structure such as subway general track sections and sewerage lines using the reversing beam construction method. This relates to a construction method for a mobile center in which the upper part of the side walls and upper floor concrete is poured using two lower center centers that have the function of switching beams and one upper center center for the upper floor formwork that slides on these lower center centers. .

Conventionally, when constructing underground tunnels such as subway general track sections,
The shorikae cut beam construction method has been adopted.

There are differences in the construction methods of the Morigae Kiribe construction method, such as the Tonosho method, the Yamagani construction method, the pile spacing, the position of the cut beams, safety, speed of construction, economical efficiency, etc., but it is A general method that does not cause any negative impact is to install struts inside and outside of the concrete structure that has already been poured.
There is a way to dismantle the strut directly above. Figure 1 shows the construction sequence for constructing an underground tunnel for a subway general track section using this conventional construction method.

In other words, ■ Subfloor concrete placement (including waterproofing).

) ■ Placing subfloor corbel concrete, side waterproofing ■ Supposed beams ■ Demolition of the directly above stump beams and pouring of side wall concrete, erection of replacement stump beams inside the side corbels, and dumping The conventional construction method includes dismantling the cut beam directly above the cut beam■, pouring concrete for the upper part of the side wall and the upper floor, and waterproofing.

By the way, the following work and problems are involved in the installation of the replacement paddy beams.

Attachment and removal of brackets, etc. that receive uprights. Attachment to and removal of intermediate piles for replacement beams. 1. Carrying out dismantled materials from dead holes after use. 9. There are safety issues when constructing and removing beams.
The work is not only complicated but also dangerous.

The present invention aims to solve the problems in conventional construction methods, and is a tunnel using a mobile center that can simplify the work and ensure work safety in the replacement cut beam construction method. This provides a construction method.

Next, the construction method of the present invention will be specifically explained with reference to a construction example of a subway general track section.

In Figures 2 to 5 ~ Heavy! The lower floor, 2 is the lower floor haunch, 3 is the lower part of the side wall, and 4 is the pillar between the up and down tunnels. ■～■It is constructed by pouring concrete.

Note that 5 is an intermediate pile provided between the up-line tunnel and the down-line tunnel, and is located closer to the up-line tunnel side in order to avoid the pillar 4. In Figure 1, 5 also indicates the intermediate pile of the aircraft. Among the movable centers used in the construction method of the present invention, there are two types of lower centers 6, 6 and 6', as shown in FIGS. One of them is the lower part of the side wall 3
The center body 7 is assembled into a rectangular parallelepiped shape with upper and lower spars at a height slightly lower than the height of It is installed on the rollers 9 arranged above.
The girder upper surfaces on both sides of the center body 7 of the lower center center 6 form groove-shaped rails extending in the front-rear direction. The other lower center 6' has a horizontally expandable jack 8' attached to the upper part of one side of the center main body 7, which is narrower in width than the center main body 7 of the lower center 6, and has a hinge structure at the upper part of the other side. It has a structure in which a jack 8' is attached to the tip of a strut 9' which is foldable from a horizontal position downward to a vertical position. The reason why the strut 9' to which the jack 8' is attached is made foldable is to avoid the intermediate pile 5 during movement. Also, upper center 1
0 also has two types, IQ and 10', as shown in FIGS.
2 is attached to the lower surface of the center body 11, and a sled 3 is attached to the lower surface of the center body 11 to slide on a rail on the upper surface of the center body 7 of the lower center center 6.

The other upper center 10' has a side projecting part of the upper floor formwork 12' that can be folded up and down by a hinge structure. A sled 13' is attached that slides on a rail on the upper surface of 7'. The reason why the upper floor formwork 12' is made foldable is to avoid the intermediate piles 5 during movement. Lower center 6, 6' as described above, upper center 0
, 10' are used for concreting the upper part of the side wall 14 and the upper floor 15, which are shown by chain lines in Fig. 2.The lower center 6 and the upper center Q' are used for construction on the down-line tunnel side where there is no intermediate pile 5. , lower center 6′ and upper center IQ
' is used for construction on the up-line tunnel side where the intermediate pile 5 is located.

First, prepare two lower center centers 6 and one upper center center IQ on the down-line tunnel side where there is no intermediate pile 5, and one lower center center 6 is already attached to the side wall as shown in FIGS. One other lower center 6 is installed on the first floor of the lower floor at the location where the concrete pouring of the upper center 4 and upper floor 5 has been completed.
are installed in a connected manner in front of them, and the upper center 0 is placed on the lower center 6 at the rear. Similarly, on the up line side where the intermediate stake 5 is located, the lower center 6'
Two units and one upper center 10' are installed. Then, at the position where the upper part of the side wall 14 and the upper floor 15 are to be constructed, that is, the position of the front lower center 6, 6', as shown in FIG.
After completing the steps ~■, instead of doing the conventional process ■, install the jacks 8, 8' on both sides of the upper part of the front lower center 6, 6'.
Extend the upper part of the lower part of the side wall 3 and replace it internally so that it extends from the inside, and install a cut beam on the back side of the lower part of the side wall 3.
Put in. Then, ``the gong beam■ directly above the stub beam■ was dismantled and''
Upper floor formwork 12, lower the wealth 2' and upper center 10, 10
' is moved onto the front lower center 6, 6', and the concrete for the upper part of the side wall 14 and the upper floor 15 is poured and cured.Next, when a predetermined period of time has elapsed, the upper floor formwork 12,
12', pull the upper center centers 10, 10' back onto the rear lower center centers 6, 6', and then move the front lower center centers 6, 6' to the position where the concrete for the upper part of the side wall 14 and upper floor 15 will be poured. After moving it and inserting the cut-off beam ■ in that position, extending the jacks 8 of the front lower center centers 6 and 6' and replacing the upper part of the lower part of the side wall 3, the upper center center 1
The rear lower center centers 6, 6' on which 0, 10' are placed are moved to a position where they are connected to the front lower center centers 6, 6', and concrete is poured for the side wall upper part 14 and the upper floor 15 in the same manner as described above. Thereafter, the same process is repeated to proceed with the construction of uplink and downlink tunnels. In addition, since there is an intermediate pile 5 on the up-line tunnel side, when moving the lower center 6', the strait 9' must be pushed down.Also, when moving the upper center 10', one side of the upper floor formwork 12' must be It is brought down to avoid the intermediate pile 5. Then, once they have been moved to a predetermined position, the strut 9f and one side of the upper floor formwork 12' are flipped upward and held in that state. As explained above, the construction method of the mobile center according to the present invention is a construction method in which the side walls and upper floor of an underground tunnel are constructed by the replacement beam construction method, and the lower floor surface in the earth crab tunnel is There are two lower centers that can be moved on the top and have the function of internal replacement cut beams, and one upper center for the upper floor formwork that slides on these lower centers. At the same time, install the lower center in a connected state on each side, install the upper center on the lower center at the rear, dismantle the side wall back cut beam construction and the top of the side wall and the upper floor concrete pouring position, and then install the upper center on the upper center. After moving the front lower center onto the front lower center and pouring the upper part of the side wall and upper floor concrete, the upper center is once pulled back onto the rear lower center, then the front lower center is moved to the next construction position, and the upper center is placed. The placed rear lower center is moved to the level where it connects to the front lower center, and the above process is then repeated. Therefore, when pouring concrete for the upper part of the side walls and upper floor, the inner refilling work is carried out by moving the lower center. In addition, by moving the upper center, the upper floor formwork can be installed easily, quickly, and safely, which solves all the problems of conventional construction methods and greatly improves work efficiency. The effect that can be obtained is obtained.

[Brief explanation of drawings]

The drawings show an embodiment in which the construction method according to the present invention was implemented for a construction example of a subway general track section, and FIG. 1 is a vertical cross-sectional front view showing the construction order of the conventional construction method, and FIG. 2 is a construction method according to the present invention. The front view of the lower center, Figure 3 is the side view of the same as above.
FIG. 4 is a front view of the upper center, FIG. 5 is a side view of the same, and FIG. 6 is an explanatory diagram of the construction method according to the present invention. 1...Subfloor, 2...Subfloor haunch, 3...Bottom part of side wall, 4...Column, 5...Intermediate pile, 6,6'...
. Lower center, 10, 10'... Upper center, 12,
12'...Top floor formwork, 14...Top of side wall, 15
...Upper floor. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. A construction method in which the side walls and upper floor of an underground tunnel are constructed using the refill beam construction method, in which a lower center is movable on the lower floor surface of the earth retaining shaft and has the function of an internal refill beam.
Using a base and an upper center for the upper floor formwork that slides on this lower center, the lower centers are installed continuously at and behind the upper part of the side walls and the upper floor concrete pouring position, and the upper center is installed at the rear. Installed on the lower center, internal replacement and construction of side wall back cut beams are carried out at the lower center at the pouring position, and the cut beams at the upper part of the side wall and upper floor concrete pouring position are dismantled, and the upper center is placed at the pouring position. After placing the upper part of the side wall and upper floor concrete, the upper center is once pulled back onto the lower center at the rear, and then the lower center at the pouring position is moved to the next construction position, and the upper center is moved to the next construction position. A method for constructing a tunnel using a movable center, characterized in that the lower center placed at the rear is moved to a position where it connects to the lower center at the pouring position, and the above steps are repeated thereafter.