JPS63147100A - An integrated construction method for shield tunnels that utilizes the primary lining - 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] After assembling the segment ring for the primary lining within the shield tail, the inner formwork ring having radially slidable members at both ends is assembled, and the second This invention relates to a method for integrally constructing a shield tunnel that takes advantage of the primary lining, which enables simultaneous construction of the secondary lining by placing the secondary lining material.

[Conventional technology]

Conventionally, after a tunnel with only a primary lining was penetrated, a secondary lining was constructed, so the construction period was long.
Since the load change during that time is not clear, the -method lining has to be designed as a permanent structure, and the secondary lining is not taken into account in terms of strength, making it an extremely uneconomical lining. That's what I was doing.

[Problem that the invention seeks to solve]

This invention attempts to solve the problems of - prolonging the construction period due to secondary lining after the completion of the primary construction, and - uneconomical problem of making the primary lining a permanent structure.

[Means for solving problems]

Assemble and fix the primary covering segment to the front of the existing primary covering segment, fill the outside of the primary covering segment with backfill material, and fill the front part of the existing inner formwork with the inner formwork. Assemble the formwork in a staggered manner, slide the rear gable of the inner formwork that is connected to the front gable of the existing inner formwork outward, and then contract the next gable ring inward. The lining material is injected into the lining material injection space surrounded by the expanded gable frame, the overlay segment, the existing secondary lining, and the inner formwork, and at the same time, the shield machine is used to excavate one step, and the excavation is continued. After completion, the problem was solved by retracting the shield jack to create a space in the tail for assembling segments, etc., and then repeating the process of assembling the primary covering segment in front of the existing primary covering segment. .

[For production]

Assemble and fix the front part of the existing primary segment and the cover segment, and assemble the inner formwork in a staggered manner to the front part of the existing inner formwork. After sliding the rear gable of the inner form connected to the front gable outward, the next gable ring is contracted inward, and the diameter of the gable has been expanded. Inject the lining material into the lining material injection space surrounded by the secondary lining and inner formwork, and at the same time excavate one step with the shield machine, during or after excavation - into the tail void on the back of the lining segment. After filling with backfilling material and completing excavation, the shield jack is retracted to form a space in which to assemble segments, etc. in the tail, and the work of assembling the primary covering segment in front of the existing primary covering segment is repeated in sequence. - By making it possible to construct the primary lining and secondary lining at the same time, the construction period can be shortened, and the rain lining functions as a composite section from the time when the initial ground load acts, resulting in an extremely economical section. can be realized.

〔Example〕

The primary covering segment (2) is assembled and fixed to the front part of the existing primary covering segment (1) to form a segment ring. After that, the main reinforcing bars and distribution bars are installed inside the cover segment (2), and the inner formwork (5) with the gable frame (4) that can be slid freely before and after the reinforcement is installed, is replaced with the existing inner formwork (5). 6), but the existing inner formwork (
The inner formwork (5) that is connected to 6) is assembled in a staggered manner (
(see Figure 8).

The inner forms (5) and (6) have the same structure and are divided into four parts in the circumferential direction of the tunnel, and the joint plates (7) on both sides have bolt holes (8) to connect with the adjacent inner form (5). is worn.

Inner formwork (5) (The end frame (4), which is formed in the same arc shape as the inner formwork on the outside, is slidably attached to the front and rear surfaces of 61 to prevent work from getting in the way inside the inner formwork. Slide it with the jack (9) provided in a place where it does not become.

Drill a long hole 0υ in the front and rear plates 00) of the inner formwork (5) and (6),
Insert the operating rod 02 into the front and rear long holes (1υ), and
The end plate (4) is fixed to the front and rear ends of the 2+, and the end plate (4) is slid by the operation of the jack (9), which pivots the rod of the jack (9) to the operating rod (12). Jack (9)
) can be attached to the reinforcing member etc. provided inside the inner formwork (5) (61).

To describe the construction of the lining material injection space vessel in detail, the inner formwork (5) is connected to the front part of the existing inner formwork (6), fixed using bolt nuts at the bolt holes aD, and the circumferential direction is After assembling the inner mold, attach the front end frame (4) of the existing inner form (6).
) and the rear gable frame (4) of the connected inner formwork (5) is operated by the jack (9), the rod is extended, and the gable frame (4) is slid outward to form a gable frame ring, and at the same time, the gable frame (4) is moved one position backward. Shrink the gable ring, airtightly close the front part of the existing inner formwork (6) and the existing primary lining segment (11), Lining material injection space (29
form.

After that, lining material injection pipe (from 2 pipes to lining material injection space C5)
At the same time as injecting lining material, shield jack (20)
- The rolled machine (I8) is excavated by one step to take the reaction force to the cover esegment (2).

During or after excavation is completed, a backfill material is injected into the tail void (3) formed between the overburden segment (2) and the ground.

Thereafter, the shield jack (20) is operated to retract the rod by one step and connect the primary cover segment (2) to the front part of the existing-law cover segment (1).

Therefore, the name of the primary covering segment (2) described in the previous section will be changed to the existing primary covering segment (1), and this work will be carried out one after another (to construct a shield tunnel).

When sealing the front part of the inner formwork with the end frame (4), fit the distribution bar into the groove (t6) of the end frame (4), seal the gap with sealing material, and cover. Stop the flow of construction materials.

In addition, after connecting and assembling the Ho-over E segments, main reinforcing bars and distribution bars may be arranged, but when producing the Ho-o E segments at a factory, as shown in Figures 2 and 3. It is also possible to simply arrange the reinforcement and assemble it on site.

- Houki Esegment (1) has reinforcing steel jig (I3) on the inner surface.
), place reinforcement bars on the main reinforcing bar side and distribution bars (19), and install reinforcement bars (
4) is provided with a groove αa for insertion of the distribution bar (15) from the outer end.

α force is the inner formwork (5) (bolt hole for connection of 61, 08
) is a shield machine with multiple plates (I9 fixed on the same circumference, a shield jack (20+ cylinder) fixed on the rear of plate α9, and the rod can be brought into contact with the primary covering segment (1). do it like this.

C9 is the selector, the container is the lining material injection pipe, the holder is the existing lining material, (24J is the skin plate of the inner formwork, and 09 is the lining material injection space.

〔Effect of the invention〕

Since the primary and secondary lining can be constructed simultaneously, the construction period can be shortened.

Furthermore, since both linings function as a composite cross section from the time when the initial ground load is applied, it is possible to realize a cross section that is extremely economical compared to conventional construction methods.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the tunnel, Fig. 2 is a front view of the primary lining segment, Fig. 3 is a view taken along the aa arrow in Fig. 2, and Fig. 4 is a longitudinal sectional view of the tunnel.
The figure is a view taken along arrow a-a in Fig. 1, Fig. 5 is a back view of Fig. 4,
6 is a view taken along the line B in FIG. 5, FIG. 7 is a view taken along the line CC shown in FIG. 5, and FIG. 8 is a plan view showing how to assemble the inner frame ring.

Claims (1)

[Claims] (1) Assemble and fix the primary lining segment in front of the existing primary lining segment, assemble the inner formwork in a staggered manner in front of the existing inner formwork, and After sliding the rear gable of the inner formwork connected to the front gable of the formwork outward, the next gable ring is contracted inward, and the expanded gable and primary lining segments are removed. , Inject the lining material into the lining material injection space surrounded by the existing secondary lining and inner formwork, and at the same time excavate one step with the shield machine. After the excavation is completed, retract the shield jack and assemble the segments on the tail. An integrated construction method for shield tunnels that takes advantage of the primary lining, which is characterized by forming a space and repeatedly assembling the primary lining segment in front of the existing primary lining segment.