JP4190932B2 - Secondary lining method and secondary lining formwork apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a secondary lining method for forming a lining concrete layer on the inner surface of a segment and a technique for improving a secondary lining formwork apparatus.
[0002]
[Prior art]
In the construction work of the shield tunnel, a secondary lining layer made of reinforced concrete is formed on the inner surface of the segment after the segment is annularly installed on the excavation wall surface.
[0003]
For example, as disclosed in Non-Patent Document 1, such a secondary lining layer is provided with a mobile formwork device called a centle on the inner surface side of a segment, and between the formwork and the segment. It is formed by placing concrete.
[0004]
FIG. 7 shows a main part when the secondary lining layer is formed by this type of mobile formwork apparatus. In the figure, reference numeral 1 denotes a movable form plate, and this form plate 1 is obtained by connecting a plurality of divided curved plates in a ring shape via a hinge, and from the inner surface of the segment 2. It is installed inward at a predetermined interval.
[0005]
Further, in the same figure, the portion indicated by reference numeral 3 is the leading secondary lining layer already formed on the face side of the tunnel, and on the side of this leading secondary lining layer 3, The state at the time of newly forming the secondary lining layer 5 is shown.
[0006]
When the subsequent secondary lining layer 5 is newly formed, the formwork plate 1 is installed, and a part thereof is placed on the leading secondary lining layer 3 on the face side of the formwork plate 1. A wrap liner 6 is installed. The wrap liner 6 is, for example, assembled in an annular shape in which an angle or the like can be disassembled.
[0007]
Further, on the wellhead side of the mold plate 1, a gable plate 7 is installed, and a sealed space 8 for forming a secondary secondary lining layer 5 is formed by placing concrete. Then, when concrete is placed in the sealed space 8 and a predetermined secondary strength is developed and the secondary secondary lining layer 5 is formed, the end plate 7 and the lap liner 6 are disassembled and removed. Then, the mold plate 1 is reduced inward and moved to the wellhead side.
[0008]
The formwork plate 1 moved to the wellhead side is expanded in diameter and installed inward from the inner surface of the segment 2 at a predetermined interval, and the lap liner 6 is assembled in an annular shape again, and its end is used as the formwork. It is fixed to the plate 1 and the end plate 7 is installed to form the next succeeding secondary lining layer.
[0009]
However, the conventional secondary lining method and the secondary lining formwork apparatus have problems described below.
[0010]
[Non-patent literature]
"New technology of shield tunnel" October 10, 2001, published by Civil Engineering Co., Ltd. p72-76
[0011]
[Problems to be solved by the invention]
That is, in the secondary lining formwork apparatus shown in FIG. 7, the wrap liner 6 is annularly assembled or disassembled using the same member, but the subsequent secondary lining layer 5 is formed. In doing so, it is assembled in an annular shape so as to be placed on the inner surface side of the preceding secondary lining layer 3 that has been partially formed.
[0012]
However, the outer diameter of the annular assembly 6 of the wrap liner 6 and the inner diameter of the preceding lining layer 3 are always very little coincident with each other. When the lap liner 6 is brought into contact, the lap liner 6 and the preceding lining layer 3 are not completely brought into close contact with each other, and a step is generated in the joint joint.
[0013]
In an actual construction site, when such a level difference occurs, a finishing process is performed by cutting the portion into a V shape and filling with mortar or the like, but it is very expensive.
[0014]
The present invention has been made in view of such conventional problems, and the object of the present invention is to provide a secondary lining method and a secondary lining method in which no step is generated in the joint between the lining layers. It is in providing the formwork apparatus for construction methods.
[0015]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, an annular movable form plate is installed at a predetermined interval along an inner peripheral surface of a segment, and a tread plate is provided on the rear end side of the movable form plate. And the movable formwork plate and the end plate separate the space part closed to the side of the preceding secondary lining layer, and the concrete is placed in the space part and the secondary secondary lining work. In the secondary lining method in which the layers are sequentially connected and formed, the movable mold plate includes a pair of separation molds at both ends in the longitudinal direction, and one of the separation molds includes the movable mold plate. When moving after demolding, it is left at the rear end of the preceding secondary lining layer formed immediately before, the movable mold plate is moved, and then fixed to the front end side, and the separation mold The other side of the frame, after moving the movable mold plate, is fixed to the rear end side, and the secondary lining which repeats such a procedure sequentially A law, before the wedge-shaped spacer thickness is contracted outwardly between mobile mold plate and said separation formwork interposed and spaced said separating formwork from the mold plate In addition, the spacer was removed.
[0017]
In addition, the present invention includes an annular movable mold plate installed at a predetermined interval along the inner peripheral surface of the segment, and a wife plate installed on the rear end side of the movable mold plate. The formwork plate and the end plate separate the space part closed to the side of the preceding secondary lining layer, and concrete is placed in the space part to sequentially connect the subsequent secondary lining layer. In the secondary lining mold apparatus to be formed, the movable mold plate is provided with a pair of separation molds at both longitudinal ends thereof, and one of the separation molds removes the movable mold plate. When moving after the mold, it is left at the rear end of the preceding secondary lining layer formed immediately before, and the movable mold plate is moved, then fixed to the front end side, and the separation mold other frame are, after moving the movable mold plate, a secondary lining for mold device for fixing the rear end side thereof, the secondary lining The frame device includes a wedge-shaped spacer that is provided between the movable mold plate and the separation mold, and whose thickness shrinks outward, and the separation mold is used as the movable mold plate. The spacer was removed before being separated from .
[0018]
In the secondary lining formwork apparatus of the present invention, the separation formwork can be formed in the same shape.
[0020]
According to the secondary lining method and the secondary lining mold apparatus of the above configuration, the movable mold plate is provided with a pair of separation molds at both ends in the longitudinal direction, and one of the separation molds is moved. When moving the formwork plate after demolding, it is left at the rear end of the preceding secondary lining layer formed immediately before, and the mobile formwork plate is moved and then fixed to the front end side. The other of the separation molds is configured to be fixed to the rear end side after the movable mold plate is moved.
[0021]
According to such a configuration, the rear end of the preceding secondary lining layer previously formed on the front end side of the space portion for placing concrete from now on and forming the subsequent secondary lining layer One separation mold left behind in the section is provided, and this separation mold is assembled and moved in an annular shape before placing concrete when forming the preceding secondary lining layer. Since it is fixed to the rear end portion of the type mold plate, there is no level difference in the joint joint as in the conventional liner plate.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. 1 to 6 show an embodiment of a secondary lining method and a secondary lining mold apparatus according to the present invention.
[0023]
FIGS. 1 to 4 sequentially show the steps of the secondary lining method according to the present invention. In the method of the present invention, the mold apparatus 10 for secondary lining whose main part is shown in FIG. 5 is used. It is done. The formwork apparatus 10 shown in the figure includes a movable formwork plate 12 and a end plate 14.
[0024]
The movable form plate 12 is assembled in an annular shape along the inner peripheral surface of the segment 16 assembled in an annular shape along the tunnel excavation surface, and is contracted inward from the annular state when moved. FIG. 5 illustrates a case where the movable mold plate 12 is contracted inward, and the movable mold plate 12 is composed of a plurality of curved plates, and is a ceiling portion 12a disposed on the upper side of the tunnel. And a pair of side portions 12b and 12c and a pair of invert portions 12d and 12e.
[0025]
The ceiling portion 12a is supported by a gate-type support portion 12f, and a pair of side portions 12b and 12c are rotatably coupled to both ends in the circumferential direction of the ceiling portion 12a via hinges 12g.
[0026]
Invert portions 12d and 12e are rotatably coupled to end portions of the side portions 12b and 12c via hinges 12g. The member indicated by reference numeral 12h in FIG. 5 is an expansion / contraction jack whose one end is fixed to the gate-type support portion 12f, and by moving the expansion / contraction jack 12h to contract or extend, the movable form plate No. 12 can be set to either the inwardly contracted state shown in FIG. 5 or the expanded state that becomes an annular shape in the tunnel.
[0027]
5 is a support jack that is interposed to restrict the movement of each part when the formwork plate 12 is contracted and moved. The support jack 12i includes a plurality of support jacks 12i. used.
[0028]
As shown in FIG. 1, the mold apparatus 10 according to the present embodiment includes a pair of first and second separation molds 20 and 22 provided at both ends of the movable mold plate 12 in the longitudinal direction. In the case of the present embodiment, the first and second separation molds 20 and 22 have the same shape, and the side surfaces on the face side of the separation molds 20 and 22 are inclined from the inside to the outside. Tapered surfaces 20a and 22a are formed.
[0029]
One first separation mold 20 is left at the rear end portion of the preceding secondary lining layer A formed immediately before moving the movable mold board 10 and moves the mold board 12. After that, it is fixed to the front end side.
[0030]
The other second separation mold 22 is fixed to the rear end side of the movable mold plate 12 via a spacer 24 after the movable mold plate 10 is moved. The spacer 24 is interposed between the movable mold plate 12 and the second separation mold 22, has a thickness that decreases toward the outside, and is formed in a tapered shape. (See Figure 6)
[0031]
The end plate 14 is fixed to the side surface of the second separation mold 22 by bolts, and the outer peripheral surface is in contact with the inner surface of the segment 16. In the formwork apparatus 10 configured as described above, as shown in FIG. 1, a closed space portion 18 is formed on the side of the preceding secondary lining layer A.
[0032]
The space 18 includes an inner peripheral surface of the segment 16 and an outer peripheral surface of the mold plate 12 facing the inner peripheral surface (the outer peripheral surface of the first and second separation molds 20 and 22 and the outer peripheral surface of the spacer 24. The inner and outer surfaces in the circumferential direction are separated from each other, and the front and rear surfaces in the axial direction are separated by the leading secondary lining A on the face side and the end plate 14 on the wellhead side.
[0033]
Then, by placing concrete in the space 18, the subsequent secondary lining layers B1, B2,.
[0034]
Next, a method of forming a secondary lining layer on the inner surface of the segment 16 using the secondary lining mold apparatus 10 having the above-described configuration will be described. When forming the secondary lining layer, first, the movable mold plate 12 is installed at predetermined intervals along the inner peripheral surface of the segment 16 by expanding and contracting the telescopic jack 12h. Assembled.
[0035]
In FIG. 1, the main part of the formwork apparatus 10 in the case where a subsequent secondary lining layer B1 is newly formed on the side of the previously formed preceding secondary lining layer A is shown. In the figure, the case where the subsequent lining layers B1, B2,... Are sequentially formed from the face side toward the wellhead side is illustrated.
[0036]
In FIG. 1, the mold plate 12 is assembled in an annular shape and installed at a predetermined interval L from the inner peripheral surface of the segment 16, and this interval L is formed in the subsequent secondary lining layers B <b> 1 and B <b> 2. The thickness is.
[0037]
The mold apparatus 10 of the present embodiment has a pair of first and second separation molds 20 and 22 disposed at both ends in the longitudinal direction of the mold plate 12, and a pair of first and second separations. The molds 20 and 22 are formed in the same shape, and the separation molds 20 and 22 are assembled in an annular shape in the same manner as the mold plate 12.
[0038]
The separation molds 20 and 22 of the present embodiment can be rotated with a hinge 12g interposed, for example, similarly to the ceiling part 12a, side parts 12b and 12 and invert parts 12d and 12e of the mold plate 12. If it is configured, it is possible to move in the tunnel by forming or contracting in synchronization with the mold plate 12 in accordance with the contraction and extension operations of the mold plate 12. It is also possible to make an annular assembly or the like completely independent of the behavior of the mold plate 12.
[0039]
The first separation mold 20 is fixed to the side surface on the face side of the mold plate 12 so as to be separable by bolts. As shown in detail in FIG. 6, the second separation mold 22 is disposed on the side surface of the mold plate 12 on the wellhead side with a wedge-shaped spacer 24 interposed therebetween.
[0040]
The wedge-shaped spacer 24 is assembled in an annular shape, and one end surface is fixed to the side surface on the wellhead side of the mold plate 12 so as to be separable by bolts, and the other end surface is attached to the tapered surface 22 a of the second separation mold 22. , And is detachably fixed by bolts.
[0041]
In this case, if a viscous substance such as grease is interposed between the spacer 24 and the tapered surface 22a, the work for pulling out the spacer 24 can be easily performed.
[0042]
The end plate 14 is fixed to the end of the second separation form 22 on the wellhead side so as to be separable by bolts. The end plate 14 is assembled in an annular shape like the mold plate 12, and the outer peripheral surface of the end plate 14 assembled in an annular shape is installed so as to contact the surface of the segment 16.
[0043]
When the formwork device 10 is installed as described above, the closed space portion 18 is separated on the side of the preceding secondary lining layer A, and when such a space portion 18 is formed, this space Concrete is cast in the portion 18 to form the secondary lining layer B1.
[0044]
Then, when the concrete placed in the space portion 18 is solidified and the strength is expressed, as shown in FIG. 2, the formation of the subsequent secondary lining B1 is completed, so that the next subsequent In order to form the secondary lining B2, the mold plate 12 is moved to the wellhead side.
[0045]
In this case, first, the bolts of the spacer 24 are removed, and the annular assembly is disassembled and pulled out inward to remove it. In this case, since the spacer 24 has a smaller thickness on the outer side, it can be easily pulled out on the inner side.
[0046]
Next, the formwork plate 12 is contracted inward, removed from the inner surface side of the subsequent lining layer B1, and then moved to the wellhead side. At this time, similarly to the ceiling part 12a, side parts 12b and 12, and invert parts 12d and 12e of the mold plate 12, the first separation mold 20 is configured to be rotatable by interposing a hinge 12g. At this stage, the first separation mold 16 can be moved together with the mold plate 12 without disassembling.
[0047]
After the mold plate 12 is moved to the wellhead side, the first separation mold 20 is separated from the mold plate 12 and disassembled. The first separation form 20 can be separated from the form plate 12 and disassembled before the form plate 12 is moved.
[0048]
In this way, when the mold plate 12 is demolded and moved together with the first separation mold 20, as shown in FIG. 3, at the rear end portion of the subsequent secondary lining layer B1 formed immediately before, It will be in the state in which the 2nd isolation | separation form 22 was left behind.
[0049]
If the second separation mold 22 is left at the rear end of the subsequent secondary lining layer B1A in such a form, the mold plate 12 is moved when the movable mold plate 12 is moved to the wellhead side. It is also possible to prevent a part of the contact with the subsequent secondary lining layer B1 from damaging the subsequent secondary lining layer B1.
[0050]
Note that the separation and removal of the end plate 14 may be performed at an appropriate time before and after the movable mold plate 12 is removed. Next, as shown in FIG. 4, after the movable mold plate 12 is moved to the wellhead side, the second separation mold 22 is fixed to the front end side of the movable mold plate 12 with bolts.
[0051]
When the spacer 24, the first separation mold 20, and the end plate 14 are assembled in this order on the rear end side of the movable mold plate 12, the closed space 18a is separated from the side of the subsequent secondary lining layer B1. Thus, a state substantially the same as the state shown in FIG. 1 is created, and concrete is placed in the space 18a to form the secondary secondary lining layer B2.
[0052]
When the movable mold plate 12 is moved after the formation of the subsequent secondary lining layer B2, the first separation mold 20 is arranged on the rear side of the movable mold plate 12 this time. Therefore, the first separation mold 20 is left on the rear end side of the subsequent secondary lining layer B2. Thereafter, the above-described steps are sequentially repeated to form a secondary lining layer on the inner surface of the segment 16.
[0053]
Now, according to the secondary lining method and the secondary lining formwork apparatus 10 configured as described above, the movable formwork plate 12 has a pair of separation formwork 20 and 22 at both ends in its longitudinal direction. One of the separation molds 20 and 22 is left at the rear end of the preceding secondary lining layer A when the movable mold plate 12 is moved after demolding. After moving, it is fixed to the front end side, and the other of the separation molds 20 and 22 is configured to be fixed to the rear end side after moving the movable mold plate 12.
[0054]
According to such a configuration, the preceding secondary covering previously formed on the front end side of the space 18 for placing concrete from now on and forming the subsequent secondary lining layers B1, B2,... One separation mold 20, 22 left at the rear end of the work layer A is provided, and the separation mold 20, 22 is made of concrete when the preceding secondary lining layer A is formed. Before being placed, it is assembled in an annular shape and fixed to the rear end of the movable mold plate 12, so that there is a step in the joint joint based on the difference between the annular outer diameter and the inner diameter of the secondary lining layer. It will not occur.
[0055]
When forming the secondary lining layer, if there is no step in the joint area, there is no need for V-shaped cutting work and finishing treatment such as mortar filling, which can cut a great deal of cost. become.
[0056]
【The invention's effect】
As described above in detail, according to the secondary lining method and the secondary lining mold apparatus according to the present invention, no step is generated at the joint between the lining layers.
[Brief description of the drawings]
FIG. 1 is an explanatory cross-sectional view of a main part of an initial process of a secondary lining method according to the present invention.
2 is an explanatory cross-sectional view of a main part of a step performed subsequent to the step of FIG. 1. FIG.
3 is an explanatory cross-sectional view of a main part of a step performed subsequent to the step of FIG. 2. FIG. .
4 is an explanatory cross-sectional view of a main part of a step performed subsequent to the step of FIG. 3. FIG. .
FIG. 5 is a side view of the main part of the formwork device for secondary lining according to the present invention. .
6 is an enlarged view of a main part of FIG. 1. FIG.
FIG. 7 is an explanatory diagram of a state where a formwork is installed in a conventional secondary lining method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Secondary lining formwork apparatus 12 Mobile mold plate 14 End plate 16 Segment 18 Space part 20 1st separation mold 22 2nd separation mold 24 Spacer

Claims (3)

Along the inner peripheral surface of the segment, an annular movable form plate is installed at a predetermined interval,
Install the end plate on the rear end side of the movable formwork plate,
The movable mold plate and the end plate separate the space closed to the side of the preceding secondary lining layer, and concrete is placed in the space to sequentially connect the subsequent secondary lining layers. In the secondary lining method to be formed,
The movable mold plate is provided with a pair of separation molds at both ends in the longitudinal direction,
When the movable mold plate is moved after demolding, one of the separation molds is left behind at the rear end of the preceding secondary lining layer formed immediately before, and the movable mold plate is After moving, it is fixed to the front end side,
The other of the separation molds is fixed to the rear end side after moving the movable mold plate,
It is a secondary lining method that repeats these steps sequentially ,
A wedge-shaped spacer whose thickness shrinks outward is interposed between the movable mold plate and the separation mold,
The secondary lining method , wherein the spacer is removed before the separation mold is separated from the mold plate . A ring-shaped movable form plate installed at a predetermined interval along the inner peripheral surface of the segment;
A wife plate installed on the rear end side of the movable mold plate,
The form plate and the end plate separate the space portion closed to the side of the preceding secondary lining layer, and concrete is placed in the space portion, and the subsequent secondary lining layer is sequentially connected and formed. In the secondary lining formwork device,
The movable mold plate is provided with a pair of separation molds at both ends in the longitudinal direction,
When the movable mold plate is moved after demolding, one of the separation molds is left at the rear end of the preceding secondary lining layer formed immediately before, and the movable mold plate is Is moved to the front end side,
The other side of the separation formwork is a formwork device for secondary lining, which is fixed to the rear end side after moving the formwork plate,
The secondary lining formwork apparatus is provided between the movable formwork plate and the separation formwork, and has a wedge-shaped spacer whose thickness shrinks outward.
The secondary lining formwork apparatus, wherein the spacer is removed before the separation formwork is separated from the movable formwork plate. The formwork apparatus for secondary lining according to claim 2, wherein the separation formwork is formed in the same shape.

Images