JPS62165000A - Method of lining shielding tunnel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for lining a shield tunnel, and more specifically, the present invention relates to a method for lining a shield tunnel. )Y? [Contact pouring,
So nyo! This invention relates to a method for forming a wall.

[Prior art]

The lining wall made of cast-in-place concrete as described above is constructed by successively arranging cylindrical formwork divided in the axial direction of the shield machine inside the tail part of the shield machine every time the shield machine is propelled. It is formed by supplying lining material to the gap between the tail part and this formwork.

The lining wall formed in this way has two advantages: compared to ready-made segments, there is no tail-made structure, and the concrete is densely layered on the ground, allowing the lining wall and the ground to behave as one. Therefore, there are advantages such as passive upper pressure from the ground can be expected, and the degree of internal stress generated in the wall of the lining is much smaller than the degree of internal stress generated in the segment R construction.

[Problem that the invention seeks to solve]

The lining wall formed as the shield machine advances is a so-called -next lining wall, and conventionally, after demolding the formwork, the -next lining turret is supported by a shoring ring, and then -A secondary lining wall is formed on the inner surface of the secondary lining wall. However, −
After the formation of the secondary wall, the shoring ring yr'M not only requires equipment, but also saves labor, and this shoring ring is usually used for the secondary lining wall. There was a problem in that it was uneconomical as it would be buried in the ground.

This invention was made to solve the problems of the conventional method as described above, and eliminates the need for a shoring ring.
As a result, construction time can be reduced by 14 years, and
The purpose of this invention is to provide a method that can reduce construction costs. Corresponding shield machine with only a short distance! Promote Marutoshi,
This method is characterized in that a predetermined number of formworks at the rear end are left on the lining wall, and a predetermined number of formworks in front of them are removed.

[For production]

The formwork left on the lining wall without being demolded will continue to support the lining wall, that is, it will perform the same function as a conventional shoring ring.

〔Example〕

As shown in FIG. 1, the shield machine is equipped with a propulsion jack 3 inside its tail portion 2, and a concrete pressing jack 5 having a gable ring 4 attached to the tip of the rod. The shielding machine 1 has a cylindrical formwork 6 divided in the axial direction.
It can be propelled by jack 3 by taking the reaction force from it. Formwork 6
Each time the shield machine 1 is propelled, concrete is successively placed inside the tail section 2, and concrete is supplied between the tail section 2 and the formwork 6 to secretly cover the ground 7. Next lining wall 8
is formed.

In this invention, the shield machine 1 is propelled by a distance corresponding to a predetermined number of formworks, and after the shielding machine 1 is propelled by a distance corresponding to a predetermined number of formworks, a predetermined number of formworks 6 m
A predetermined number of formworks 6 are left on the 4-th grade machining wall 8 and in front of it.
b is removed from the mold. 6c shows the formwork left behind last time. In the illustrated example, two molds 6a are left and two molds 6b are removed, but these numbers are determined as appropriate.

FIG. 2.3 shows the procedure for forming a secondary maple wall. As shown in FIG. Concrete is placed between the primary lining wall 8 and the secondary lining wall portion 10. Next, as shown in FIG. 3, the formwork 6c between the secondary lining wall portions 10 is demolded and placed in a movable formwork 9 here,
Concrete is poured to form a continuous secondary lining wall. Formation of such a secondary lining wall may be performed immediately after the shielding machine 1 is propelled and the formwork eb (see FIG. 1) is removed from the mold fc.

Note that the demolded M formwork is placed inside the tail portion 2 and used again.

〔Effect of the invention〕

As described above, according to the present invention, as the shield machine advances, a part of the formwork is left on the lining wall at the end of the formwork, and the other part is removed, so that the remaining m formwork is The lining wall 7 is supported, so that the conventional shoring ring becomes unstable, and not only can the construction labor be simplified, but the construction cost can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing one embodiment of the present invention;
Figure 3 is a longitudinal sectional front view showing the procedure for forming a secondary lining wall following the primary lining wall. 1... Shield machine 2... Tail part 6... Formwork 6a, 6c... left 'nfC, formwork 6b... demolded and next formwork 7... other piles 8...・−
Next lining wall 9...Movable formwork 10...Secondary lining wall part

Claims (1)

[Claims] 1. Each time the shield machine is propelled, a cylindrical formwork divided in the axial direction of the shield machine is successively arranged inside the tail part of the shield machine, and the gap between the tail part and this formwork is covered. In the shield tunnel lining method, which supplies construction materials and forms lining walls, the shield machine is propelled a distance corresponding to a predetermined number of formworks, and then a predetermined number of formworks at the end are lined. A shield tunnel lining method characterized by leaving a predetermined number of formwork on the wall and removing a predetermined number of formwork in front of the formwork.