JPS63147094A - Method of concrete lining construction at site of 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 application presses unhardened lining material through a press ring using the pressing force of a jack during on-site lining of a tunnel, and applies pressure etc. for a certain period of time. After holding the lining, the reaction force is further removed from the lining and the annular inner formwork is slid, thereby shortening the construction time and preventing insufficient pressing of the lining material. This invention relates to a lining construction method.

[Conventional technology]

In the conventional monolithic concrete lining method, the propulsive reaction force of the shield is limited to the unhardened lining material, and the inner formwork is gradually diverted to the rear, and the propulsion reaction force is absorbed by bush rods buried within the lining. There are methods that do not press the lining materials, and methods that apply a propulsion reaction force to the inner formwork and press the unhardened lining materials using a different type of jack.

[Problem that the invention seeks to solve]

When converting the inner formwork, the problem is that it is difficult to remove and assemble, the pressing force of the material that has not yet solidified is unstable, and the reinforcement of the lining such as steel frames and reinforcing bars is required. The problem is that the construction of the lining material is complicated, and taking the propulsion reaction force only by the pressing force of the lining material that has not yet solidified will not only lead to unstable excavation, but also make it difficult to manage the pressing force of the lining material. This invention relates to an on-site lining construction method for tunnels that attempts to solve this problem.

[Means for solving problems]

After injecting the lining material into the lining material injection space surrounded by the press ring, the tail of the excavation machine, the inner formwork, and the existing lining material, the press ring or lining reinforcing material absorbs the reaction force and While excavating the mountain, a jacking thrust is applied to the lining material that has not hardened yet, and after maintaining the pressure for a certain period of time, the inner formwork and press ring also move forward to form a space for injecting the lining material, and the above construction is repeated in sequence. By doing so, the problem mentioned above is solved.

[Effect]

Function of the first embodiment: In the lining material injection space surrounded by the press ring, the tail of the excavation machine, the annular inner form and the existing lining, one or more injection pipes installed on the inner surface of the inner form A predetermined amount of lining material such as concrete is injected, and then the reaction force of the jack thrust is applied to the unhardened lining material via a press ring to dig into the ground, and after maintaining the pressure etc. for a certain period of time, a circular Loosen the annular inner formwork deformation prevention ring with a jack, then use the inner formwork slide jack to apply a jack to the lining material through the press ring to retract the rod, and then press the press ring to prevent the inner formwork from moving forward. to form a lining material injection space surrounded by the press ring, the tail of the excavation machine, the annular inner plate frame, and the existing lining on the outer periphery of the inner formwork at the forefront. Thereafter, the work described above will be repeated.

The lining reinforcing ring is assembled inside the tail of the excavation machine, and the inner formwork is placed in the lining material injection space surrounded by the press ring, the tail of the excavation machine, the inner ring-shaped inner formwork, and the existing lining. A predetermined amount of lining material such as fresh concrete is injected through one or more injection pipes installed on the inner surface, and then the excavation machine (ground rock) is used to excavate the ground by applying thrust to the girder member of the lining reinforcing ring. The press jack installed in the excavation machine pressurizes the lining material that has not hardened yet through the shield ring, and after maintaining the jack pressure etc. for a certain period of time, the stroke of the shield jack is shortened and the press ring linked to it is moved forward. After moving, the girder members of the lining reinforcing ring buried in the existing lining are connected to the girder members of the subsequent lining reinforcing ring via end plates with melt nuts, and the adjacent circular arc members or main reinforcing bars are connected in the circumferential direction. Either connect the main reinforcing bars with a gel donner or to through the end grate, or overlap and joint the main reinforcing bars, and then assemble the lining reinforcement ring by overlapping and joining the subsequent distribution bars to the existing distribution bars, and then prevent the deformation of the annular inner frame. Loosen the ring with a jack, move the inner frame slider, and use the key to remove the reaction force from the annular inner formwork that continues at the rear. After sliding the frontmost inner formwork a unit length, After loosening the deformation prevention ring using the tensile jack installed at the connecting part, slide the following inner formwork by a unit length, attach the press ring to the outer periphery of the inner formwork at the front, and attach the excavation machine to the inner formwork. A lining material injection space is formed surrounded by the tail, the annular inner formwork, and the existing lining. Thereafter, the above work will be repeated.

Operation of the third embodiment After assembling the lining reinforcing ring in the tail of the excavation machine, and then assembling the inner formwork segments, the lining surrounded by the press ring, the tail of the excavation machine, the inner formwork and the existing lining is assembled. After injecting lining materials such as fresh concrete into the material injection space through one or more injection pipes attached to the inner surface of the inner formwork, the propulsion reaction force is transferred to the lining reinforcing ring that passes through the press ring. During or after excavation, remove the last segment ring and send it forward). After pressing the lining material that has not hardened yet and maintaining jack pressure etc. for a certain period of time, the stroke of the shield jaw and jack is shortened and the press ring that is linked to it is moved forward to create a lining reinforcing ring buried in the existing lining. The girder member of the subsequent lining reinforcement ring is connected to the girder member of
Connect the contacting arc members or main reinforcing bars with bolts and nuts via end plates, or overlap the main reinforcing bars, overlap and join the subsequent distribution bars to the existing distribution bars to assemble the lining reinforcement ring, and then The inner formwork segment that was at the very end being transported to T-Cortona.

Assemble the tail of the excavation machine, inner formwork segments, existing lining, and press ring to secure space for injection of lining material. Thereafter, the work will be carried out by repeating the above-mentioned work.

〔Example〕

First Example: An annular inner formwork (2) is assembled near the tail of the earth excavation machine (5) that is propelled inside the shield (1), spanning the machine (5) and the existing lining (6), and Frame (2)
Formwork deformation prevention rings (3) are installed on the top and bottom of the inside of the frame, and hydraulic jacks (
4), and a grate (
7) at several locations at average intervals, attach formwork slide gloss (8) to the rear of said grate (7), and install intermediate inner Kf grates 9) of the machine (5) at several locations at average intervals. Attach the jaw (10) to the rear of the plate (9).

A circular press ring (11) is provided at the rear end of the rod of the jacks (8) and (10), and the press ring (U) is inserted between the tail of the excavation machine (5) and the inner formwork (2). A sealing material (12) is provided on the inner and outer circumferences of the inner and outer circumferences, and the inner and outer circumferences are airtightly inserted.

The inner formwork (2 &) that follows the inner formwork (2) at the forefront, and the inner formwork (2b) that follows the inner formwork (2a), each have an intermediate jack (13) for sliding the formwork and a frame center. Holers and keys (14) are installed alternately in the circumferential direction of the inner formwork (2).
82m) * (2aX2b) are installed in series. The intermediate jack for sliding the formwork (13) is extended to slide the front inner formwork (2) (2m) forward, and retracted to move the rear inner formwork (2aX2b) forward. It acts as if it slides into the section.

The formwork center hole jack (14) is installed at the rear of the inner formwork (2) or (2a) located at the front, and what is the rear inner formwork (2a) or (2b)? Connect the tension member (15) fixed to
) to move forward.

(16) is an inner formwork stiffening ring of the inner formwork (282aX2b), and is provided at right angles to the outer periphery of the inner formwork.

(17) also has a stiffening girder (18) with a press ring (11).
), (19) is a lining material injection space, and (20) is a lining material injection pipe.

Press ring (11), m-adic machine (5) tail,
The main concrete lining is injected into the space (19) surrounded by the annular inner formwork (2) and the existing lining (6) through one or more injection pipes (20) installed on the inner surface of the inner formwork (2). A predetermined amount of construction material is injected, and then the propulsion reaction force of the jacks (8) and (10) is transferred to the unhardened lining material via the press ring (11), and the excavation machine (5) (ground rock) is used to excavate. After holding the pressure etc. for a certain period of time, loosen the frame deformation prevention ring (3) inside the annular shape by operating the jack (4), and press the inner form frame slide jack (8) through the press ring (11). At the same time, the inner formwork (2) at the frontmost part is slid a unit length toward the ground side by taking a reaction force on the lining material, and at the same time the inner formwork (2m) (2b) connected to the rear part is installed at the connecting part. Tajatsuki C
After loosening the deformation prevention ring (3) (13 Apply the lever (8) to contract the opening and the opening, move the press ring (11) near the tip of the advancing inner form, and place the press ring (11) on the outer periphery of the inner form at the forefront.
A space (19) is formed surrounded by the tail of the excavation machine (5), the annular inner formwork (2), and the existing lining. Thereafter, the work described above will be repeated.

According to this construction method, it is possible to slide the inner formwork before the lining has hardened, reducing construction time and preventing insufficient pressing of lining materials compared to conventional construction methods.

The annular inner formwork is usually divided into several parts in the direction of the tunnel axis by one or more connecting parts, and the required length is obtained by sliding a certain unit length sequentially from the part closest to the face and repeating this process. Slide it.

The total length of the inner formwork is determined by the point at which the rearmost formwork slides.
The determination is made on the condition that the lining in that area has the required strength.

After the inner formwork slides, the press ring is moved in the face direction by pulling back the jack via the jig /f (well) integrated with the press ring (11).

As the lining material, we will use materials such as early-strength concrete and steel fiber concrete (SFC) that can provide initial strength that is commensurate with the planned construction cycle.

Second embodiment: Assemble the lining reinforcing ring (30) in the tail of the earth excavation machine (5) that excavates inside the shield (1),
An annular inner formwork (2) is assembled near the tail of the earth excavation machine (5) to be excavated, spanning the excavation machine (5) and the existing lining (6), and molds are placed above and below inside the inner formwork (2). A frame deformation prevention ring (3) is provided, and the upper and lower deformation prevention rings (3) are connected in series on the left and right sides using hydraulic jacks (4).
(9) are installed at average intervals in several places on the inside of the excavation machine (5), and press jacks (31) and shield jacks (32) are installed alternately at every other place at the rear of the grate (9). .

A circular press ring (33) is provided at the rear end of the press jack (31).
) A sealing material (34) is provided inside and outside between the tail of the tv thin (5) and the inner formwork (2) to ensure airtight insertion.

Attach the shield jack (32) to the press ring (33).
) is provided with a hole (35) for airtightly inserting a finger member to be described later.

The inner formwork (2a) following the inner formwork (2) at the forefront, and the inner formwork (2b) following the inner formwork (2a) are each equipped with an inner formwork slider, a key (36) and a Inner formwork tension jacks (37) are alternately installed in the circumferential direction of the inner formwork (202a).
.

Concatenate (2aX2b).

In the excavation machine described above, a lining reinforcing ring is formed separately from the inner formwork and is inserted and connected to the lining material injection space to obtain concrete strength after curing.

As shown in Fig. 11, the constituent elements of the lining reinforcing ring (30) are two lining reinforcing circular arc members (38) bent in an arc shape, arranged in front and behind each other, and ends having bolt holes (39) at both left and right ends. gray) (40), and two arc members (38
) is provided with a vertical plate-shaped finger member (41) passing through the center thereof,
An end gray (40) having a bolt hole (39) is provided at the front and rear ends of the finger member (41).
) on both sides of the finger member (
41) A plurality of distribution bars (42) are arranged and formed at appropriate intervals.

Further, the arc member (38) and the finger member (41) are provided with air vent holes (43) at several locations.

The constituent elements of the lining reinforcing ring (30) shown in Fig. 12 are H
The lining reinforcement girder members (
44), and bolt holes (
39), and a plurality of arc-shaped main reinforcing bars (45) are arranged above and below the finger member (44), and a plurality of distribution bars are arranged to intersect with the main reinforcing bars (45). (
42) is formed by reinforcing.

The constituent elements of the lining reinforcing ring (30) shown in Fig. 13 are cylindrical finger members (46) filled with concrete, etc.
The rear end of the finger member (46) is a circular tube (47) whose inner diameter is the outer diameter of the finger member (46) as a connecting jig to use the existing girder member as a guide when assembling the reinforcing ring. Fit and secure.

The rear part of the circular tube (47) is extended long enough to fit the existing girder member.

(48) is a lining material injection pipe, (49) is an inner formwork supplementary ring, and a stiffening girder (50) is provided as appropriate.

(51) A seal material provided on the Fi press ring (33) is provided inside and outside around the hole (52) for fitting the finger member (41 x 44 x 46).

(53) is the opening of the press jack (31) provided on the press ring (33), a jig that supports the do, and (54) is the through hole of the distribution bar (42), which is bored in the press ring (33). .

Lining reinforcement ring (30) in the tail of the excavation machine (5)
Assemble the press ring (33) and digging machine (5).
), in the space (19) surrounded by the inner ring-shaped inner formwork (2) and the existing lining, one or more injection pipes (48) installed on the inner surface of the inner formwork (2) are filled with fresh concrete. After injecting a predetermined amount of lining material such as Pressurize the lining material that has not hardened yet through the presser ring (31) and maintain the pressure for a certain period of time, then shorten the stroke of the shield jack (32) and press the lining material that has not hardened yet. Move the interlocking press ring (33) forward and end play the girder member of the subsequent lining reinforcement ring (30) onto the girder member of the lining reinforcement ring (30) that was buried in the existing lining after death) (40) Connected with gel nuts through the circumferentially adjacent arc members (38) or main reinforcing bars (45)
be connected with gel nuts via end grates (40), or overlap the main reinforcing bars (45) and connect them to existing distribution bars (
42) and the subsequent distribution bar (42) to assemble the lining reinforcing ring (30), then loosen the annular inner formwork deformation prevention ring (3) with the Shatzki (4) operation, and remove the inner formwork. Use the frame slide jack (37) to remove the reaction force from the annular inner formwork (2) that continues behind, and slide the innermost formwork (2) at the front by a unit length toward the ground and connect it to the rear after death. The inner formwork (2a) that is
7) in combination to loosen the deformation prevention ring (3), slide the succeeding inner formwork (2a) by a unit length towards the ground, and at the same time further tighten the subsequent inner formwork provided at the connecting part of the frame (2b). Extend the jack (37) to assist the sliding of the front inner formwork (2a), and then remove the deformation prevention ring (3) of the inner formwork (2b).
), then tighten the inner formwork (2b) with a tension jack (37).
) to the ground side by a unit length, and attach the press ring (33), the tail of the excavation machine (5), the annular inner formwork (2), and the existing lining to the outer periphery of the inner formwork (2) at the forefront. A space (19) surrounded by is formed. Thereafter, the work will be carried out by repeating the above-mentioned work.

The constituent elements of the lining reinforcing ring shown in FIG. 11 can be efficiently assembled by joining the existing components and the elements together using lutners, tors, etc. The reinforcing material in this example is H steel, but it is possible to arrange dowels or the like on its 7 lunges to achieve integration and synthesis with surrounding lining materials.

In addition, cylindrical girder members filled with concrete (4
6), the end of the girder member (46) is connected to the existing girder member with bolts by installing a circular pipe (47) as a connecting jig to use the existing girder member as a guide when assembling the reinforcing ring. By doing so, the system will be integrated.

The press ring is provided with a rectangular hole passing through the girder member for the auxiliary agent, and the propulsion reaction force of the shield is mainly absorbed by the girder member by the shield jack. On the other hand, in addition to the above, there is also a press jack that directly presses the press ring. By adjusting this pressure, the required pressure is applied to the lining material that has not yet hardened, and an auxiliary propulsive reaction force is applied. You can take it.

The annular inner formwork is usually divided into several parts in the direction of the tunnel axis by one or more connecting parts, and the unit length is sequentially slid from the part closest to the face, and this is repeated to slide the required length.

The total length of the inner frame is determined on the condition that the lining in that part has the required strength at the time the rearmost formwork slides.

As the lining material, a material having an initial strength suitable for the planned construction cycle, such as concrete, is used.

Third Embodiment A plate (9) is provided at a constant interval in the middle of the earth excavation machine (5) that excavates inside the shield (1), and a shield jack (5) for pressing and propulsion is installed on the nuclear grate (9).
5) and propulsion-only shield jacks (56) are installed alternately at every other location, and the same press ring (33
). The press ring (33) is provided with rectangular holes (52) that pass through the girder members of the lining reinforcing ring components, which are the same as those in the second embodiment, and are spaced at regular intervals.

MO of the press ring (33) and the existing toric internal deaf frame segment) (59) (the toric internal deaf frame segment)
Assemble (60). The segments (59) and (60) can be easily assembled by connecting them with bolts and nuts.

The constituent elements of the lining reinforcing ring and the press ring constituent elements are the same as those in the second embodiment, so their explanation will be omitted.

Lining reinforcement ring (30) in the tail of the excavation machine (5)
After assembling the inner formwork segment) (60), press ring (33) and excavation machine (5).
) tail, inner formwork segment) (60) and the space surrounded by the existing lining (19), inner formwork segment) (60)
After injecting lining material such as fresh concrete through one or more injection pipes (48) attached to the inner surface of D, the propulsion reaction force is transferred to the girder member of the lining passing through the press ring (33). The shield jack (55
) press the unhardened lining material through the shivering ring (33) and maintain the jack pressure etc. for a certain period of time, then shorten the stroke of the shield jack (55) (56) and press the press ring in conjunction with it. (33) is moved forward, and the girder members of the subsequent lining reinforcing ring are connected to the girder members of the lining reinforcing ring (30) buried in the existing lining with gel nuts via the end grate (40), and the circumferential The direction is to connect adjacent arcuate members (38) or main reinforcing bars (45) with gel nuts via end grates (40), or to overlap and connect main reinforcing bars (45) to follow existing distribution bars (42). The distribution bars (42) are overlapped and the lining reinforcement ring (30
) was assembled, and then the rearmost inner formwork segment, which was being carried forward, was assembled using gelt nuts and the excavation continued for 77 m (
5) Secure the lining material injection space (19) using the tail, inner formwork segment, existing lining, and press ring. Thereafter, the work will be carried out by repeating the above-mentioned work.

When attaching the end plate at the end of the girder member, by adjusting and manufacturing the angle brackets in advance, the installation position of the reinforcing ring during curve construction can be ensured with high accuracy.

Annular inner formwork segment) (59) (60) Steel segments etc. are used for K, and as shown in Fig. 18, it is composed of multiple chees/4'-IJ rings, so it is a tapered ring. The combination of these can be used to construct straight lines and curves with various curvatures.

The advantage is that this inner formwork segment is economical because the rear ring segment can be removed and reused by sequentially assembling it at the front.

According to this construction method, compared to conventional construction methods, the workability and installation accuracy of reinforcing materials for the lining are improved not only in straight sections but also in curve construction.

〔Effect of the invention〕

According to this construction method, it is possible to slide the inner formwork before the lining has hardened, which shortens the construction time compared to conventional construction methods and prevents insufficient pressing of the lining material. The structural reinforcement ring components can be assembled efficiently by joining the existing ring and elements together using melting, etc.
By placing a dowel or the like on the flange of the Hffl steel reinforcing material, it is possible to integrate and synthesize it with the surrounding lining material.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of the tunnel of the first embodiment, FIG. 2 is a view taken along the a-a arrow in FIG. 1, a view taken along the bb arrow of the third section, and FIG. 4 is a view taken along the e-c arrow in the same 5 is a partial sectional view of the press ring, FIG. 6 is a vertical sectional view of the tunnel of the second embodiment, FIG. 7 is a view taken along the aa arrow in FIG. 6, and FIG. bb arrow view, 9th
10 is a front view of the lining reinforcing rings of the second and third embodiments, FIGS. 11 to 13 are perspective views of the lining reinforcing rings, and FIG. 14 15 is a cross-sectional view of a part of the press ring of the second and third embodiments, FIG. 16 is a vertical cross-sectional view of the tunnel of the third embodiment, and FIG.
18 is a plan view of an example of the arrangement of the inner formwork segments. Patent applicant: Toda Construction Co., Ltd. Figure 1 Figure 2 Figure 3 O

Claims (1)

[Claims] (1) After injecting the lining material into the lining material injection space surrounded by the tail of the press ring excavation machine, the inner formwork and the existing lining material, the reaction force is taken by the press ring or the lining reinforcing material, While excavating the ground, a jack thrust is applied to the lining material that has not hardened yet, and after maintaining the pressure for a certain period of time, the inner formwork and press ring are advanced to form a space for injecting the lining material, and the construction is carried out sequentially. An on-site tunnel lining construction method that is characterized by repeated work.