JP3873465B2 - Secondary lining method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a secondary lining method in a shield tunnel.
[0002]
[Prior art]
When constructing a tunnel by the shield method, when constructing the primary lining by the annular assembly of segments, in order to establish the lining function such as waterproofness, corrosion resistance, inner surface smoothness etc. A so-called secondary lining by concrete placement is installed inside the work.
[0003]
[Problems to be solved by the invention]
Construction of secondary concrete lining is complicated, such as assembling and dismantling the formwork and placing concrete curing, and the formwork cannot be removed without waiting for the concrete to harden. Cost burden was great.
[0004]
In addition, concrete is poor in acid resistance, and when the constructed shield tunnel is used as a sewer for sewers, it is easily affected by the acid gas generated from the sewage, and the corrosion resistance of the secondary lining may become a problem. It was.
[0005]
The present invention has been made for the purpose of reducing the construction cost of secondary lining and improving the corrosion resistance.
[0006]
[Means for Solving the Problems]
In the construction of a shield tunnel, the present invention provides a shape-retaining rail having a fitting locking recess along the longitudinal direction when a secondary lining is applied to a primary lining constructed by annular assembly of segments. And a plastic strip-like lining material with dimensions equivalent to the roughly equally divided piece of the secondary lining body, and the shape-retaining rail has a fitting locking groove on the inner wall surface of the primary lining. The mounting and fixing is performed in a state where it is opened on the side opposite to the inner wall surface, and there are many fixed mounting rails extending over the entire length in the tube axis direction of the primary lining and at equal intervals in the tube surrounding direction. After the shape-retaining rail is mounted and fixed, the cylindrical secondary lining body inscribed in the shape-retaining rail is assembled from the lining material. In this case, the lining material is a joining end of the lining material. The joint linings are sequentially joined in the circumferential direction by fitting the joint concavo-convex portions formed along the lining material, and the lining material is formed on the back side of the fitting locking ridge and the shape retaining rail fitting locking recess, respectively. It is held on the shape-retaining rail by fitting and locking, and after assembling the secondary lining main body, a backfill is applied to the gap between the secondary lining main body and the primary lining. It relates to the next lining method.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In carrying out the secondary lining method of the present invention, a lining material 1 having a cross-sectional structure shown in FIG. 1 and a shape retaining rail 2 shown in an enlarged manner in FIG. 2 are used.
[0008]
The lining material 1 is in the form of a strip and is made of plastic (for example, polyvinyl chloride, polyethylene, polypropylene, etc.), and has dimensions approximately corresponding to the equally divided pieces in the tube surrounding direction of the secondary lining body A (see FIG. 8). The secondary lining main body A can be assembled by connecting in the pipe circumference direction. FIG. 1 shows a lining material 1 having a shape and shape corresponding to eight divisions of the secondary lining main body A. The lining material 1 has an arc shape and has a T-shaped rib 1a on the back side and any other cross-sectional shape. Are formed along the longitudinal direction.
[0009]
Further, joint concavo-convex portions 3a and 3b for joining the lining materials 1 and 1 to each other in the tube periphery direction are formed along both side edges of the lining material 1, and the convex portion 3b is formed from one end side of the lining material 1. It protrudes to the back side, and the recess 3a is recessed from the other end side to the back side, and the lining materials 1 and 1 can be sequentially joined in a flat state on the inner surface by fitting and locking these uneven portions 3a and 3b. ing. A vertical auxiliary rib 1a ₁ and a horizontal auxiliary rib 1a ₂ are formed on the back of the recess 3a. In addition, the lining material 1 is slightly larger than the width of the eight divisions by the lap width of the joint uneven portions 3a and 3b.
[0010]
Further, on the back side of the lining material 1, fitting locking protrusions 4 extending in the longitudinal direction are formed at two locations near the center in the width direction and one end side, for example, in the vicinity of the protrusion 3 b. ing. It is appropriate that the ridges 4 have a structure that can resist expansion and contraction in the width direction at the cracks 4a.
[0011]
The shape retaining rail 2 is made of, for example, metal and includes a fitting locking recess 5 along the longitudinal direction. In the illustrated embodiment, the recess 5 has a cross-sectional groove shape of the shape retaining rail 2 and both sides. Consists of bent portions 2b, 2b formed on the free ends of the walls 2a, 2a, and an interval 2c between the opposed inner ends of the bent portions 2b, 2b. Reference) and can be engaged and locked.
[0012]
Upon construction of the present invention the secondary lining method as shown schematically in Figure 3, the first fixed installation of the shape retaining rail 2 against the inner wall surface of the primary lining A ₁ is performed. Incidentally, the primary lining A ₁ is assembled in an annular shape using, for example, a steel segment, as in the conventional method. The segment is not necessarily made of steel, and may be made of concrete, for example.
[0013]
Shape retaining rail 2 is carried from the work tank a primary lining A ₁ which opens into the pit a, by replenishing the carrying easy 1~3m about standard dimension thereof, of the primary lining A ₁ It is attached and fixed to the wall surface by applying fastening means such as welding means or anchor bolts over the entire length along the tube axis direction. The mounting fixed, mating locking concave 5 of the shape retaining rail 2, opposite to the inner wall surface, i.e. is performed so as to open toward the center of the primary lining A _1. As shown in FIG. 4, the shape-retaining rail 2 is fixed and attached to 16 locations at equal intervals in the tube surrounding direction. This is because the lining material 1 is of an eight-divided type, and one lining material 1 has two fitting locking projections 4 and a total of 16 fitting locking projections 4. It is.
[0014]
After finishing the fixed rail installation work, the lining material 1 is carried into the work pit a while being wound around the drum D, and the lining material 1 is pulled out from the drum D as shown in FIG. It is inserted over the entire length of the primary lining a ₁ while. The insertion of the lining material 1 is repeated 8 times in accordance with the progress of the assembly because it is an eight-divided type, and the eight lining materials 1 from the first to the eighth are inserted into the primary lining A ₁ . Will be.
[0015]
Figure 6 shows a mounting fixed conditions for the first lining material 1 ₁ of the shape retaining rail 2. The first lining material 1 ₁ is fixedly attached to the shape retaining rail 2 with respect to a pair of adjacent first shape retaining rails 2 ₁ and 2 ₁ , and the lining material 1 is attached and fixed. Hamagogakari the two shape retaining rails 2 _1, 2 ₁ of mating locking concave _{5,5 1} of two mating locking projections 4,4 of forming the back corresponding to the It has stopped. By fitting engagement of such concave-convex 4,5, lining material 1 ₁ is mounted and fixed through the primary lining A first Kumihogata rail 2 ₁ to the inner wall surface of the _1, 2 _1. Is In this fixedly attached state, the lining material 1 ₁ among joint projection 3b of the one side of the first Kumihogata rail 2 _1, 2 _1, right shape retaining rail 2 ₁ In FIG. 6 The joint recess 3a on the other end side is located slightly away from the outside, and is close to the outside of the right shape-retaining rail 2 ₂ in FIG. 6 among the second set shape retaining rails 2 ₂ and 2 ₂ . The lateral auxiliary rib 1a ₂ attached to the recess 3a is suspended at the upper end of the side wall ₂₂ 1 of the nearest shape-retaining rail 2 ₂ , while the vertical auxiliary rib 1a ₁ is attached to the outer wall surface of the side wall 2 _21. , by the action of the auxiliary ribs 1a _1, 1a ₂ of these vertical and horizontal, first the other end of the lining material 1 ₁ is supported from the back side by the side wall 2 _21, the first rear side of the lining material 1 _1, the full width through a constant distance between the primary lining a ₁ is held.
[0016]
Next, the second lining material 1 ₂ is connected to the first lining material 1 _{1 in the} direction around the pipe, and at the same time as this connection, the second lining material rails 2 ₂ and 2 ₂ are connected in the manner described above. The concave and convex strips 4 and 5 are attached and fixed under the fitted and locked state. The connection of the first and second lining materials 1 ₁ , 1 _{2 in} the tube surrounding direction is performed by fitting and locking the concavo-convex portions 3a, 3b. FIG. 6 shows a state immediately before joining the first and second lining materials 1 ₁ and 1 ₂ .
Thereafter, the secondary lining main body A can be assembled as shown in FIG. 8 by repeating such an operation and connecting the eight lining materials in the direction around the pipe and fixing them to the shape retaining rail. . Incidentally, as shown in FIG. 7, initially, fitting locking projections 4 of the first lining material 1 ₁ start end side is removed from the fitting locking concave 5 of the shape retaining rail 2 ₁ corresponding thereto When the final concavo-convex portions 3a and 3b of the first and eighth lining materials 1 ₁ and 1 ₈ are fitted and joined, at the same time, the removed ridges 5 correspond to this. It is convenient in construction to engage and lock with the recess 5.
[0017]
After finishing the assembly of the secondary lining main body A, back-filling material is injected filled into the gap b between the primary lining A ₁ (see FIG. 8). As shown in FIG. 8, the steel segment has a recess b ₁ on the inner wall surface, and this recess b ₁ communicates in the tube axis direction through the gap b. In the state where the filling port c ₁ of c is inserted into the gap b through the insertion port (not shown) formed in the secondary lining main body A, the backfill material B is injected and filled, so that the gap b and the dent b _The backing material B can be injected and filled over the entire area of ₁ and the construction of the secondary lining on the heel is finished.
[0018]
The main part of the secondary lining thus constructed is made of a plastic lining material, so it has excellent acid resistance and thus anticorrosion properties. Even when applied to sewers, it is susceptible to acid gas. Will not be done.
[0019]
In the present invention, the secondary lining main body A may be assembled using two types of lining materials 1A and 1B as shown in FIG. One lining material 1A is provided with joint convex portions 3b, 3b at both side edges, and is provided with three fitting locking convex strips 4 at the central portion and both side portions. The other lining material 1B is provided with joint recesses 3a, 3a at both side edges, and one fitting locking protrusion 4 at the center. As shown in FIG. 11, the secondary lining main body A is assembled by first attaching and fixing every other lining material 1B having joint recesses 3a and 3a, and then connecting the joint projections 3b and 3b. If the mounting and fixing of the provided lining material 1A is performed, the fitting and locking operation of the joint concavo-convex portions 3a and 3b becomes easy.
[0020]
If the number of divisions of the secondary lining body A is too small, the degree of curvature of the lining material will increase, and this will make it difficult to wind the drum and insert it into the primary lining. Since the number of joints in the direction increases and the joining operation becomes complicated, an equal division number of about 6 to 10 is appropriate.
[0021]
It is sufficient that at least one fitting locking convex portion formed on the back surface of the lining material is formed on one lining material, and usually about 1 to 3 per sheet is sufficient.
[0022]
【The invention's effect】
According to the present invention, it is possible to construct a secondary lining by a simple operation of assembling a secondary lining main body from a strip-like lining material and then performing back lining, and the secondary lining main body stabilizes the back lining. Since it holds securely, there is no need to wait for the curing of the backfill, the construction period can be shortened, and the construction cost can be reduced.
[0023]
Furthermore, since the secondary lining body is back-filled, it has perfect measures against water leakage from the primary lining side, and since it is made of plastic, it is excellent in acid resistance and anticorrosion, and is applied to sewerage. However, the secondary lining function can be maintained stably over a long period of time.
[Brief description of the drawings]
FIG. 1 is a view showing a cross-sectional structure of a lining material applied to the assembly of a secondary lining main body in the secondary lining method of the present invention.
FIG. 2 is a perspective view of a shape-retaining rail applied to fixing the lining material to the primary lining.
FIG. 3 is an explanatory view schematically showing a state of an installation fixing process to a primary lining inner wall surface of a shape retaining rail.
FIG. 4 is an explanatory view schematically showing a state after the installation and fixing are completed.
FIG. 5 is an explanatory view schematically showing the state of the step of inserting the lining material into the primary lining.
FIG. 6 is an explanatory view showing a situation in the middle of assembling the secondary lining main body from the lining material.
FIG. 7 is an explanatory diagram showing a preferred joint technique for the final joint portion.
FIG. 8 is an explanatory view schematically showing a situation after the assembly of the secondary lining main body is completed.
FIG. 9 is an explanatory diagram schematically showing a situation during backfilling work.
FIG. 10 is a diagram showing a cross-sectional structure of two types of lining materials that are alternately connected in the tube surrounding direction.
FIG. 11 is an explanatory diagram of a lining material connecting operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lining material 1a Rib 2 Retaining shape rail 3a Recess 3 for joint 3b Convex part 4 Joint protrusion 5 Fitting engagement groove

Claims (4)

In the construction of a shield tunnel, when a secondary lining is applied to a primary lining constructed by an annular assembly of segments, a shape retaining rail with a fitting locking recess along the longitudinal direction, and a secondary A plastic strip-like lining material with a dimension corresponding to a roughly equal segment of the lining body is used, and the shape-retaining rail has a concave groove for fitting engagement with the inner wall surface of the primary lining. Is fixed in the open state on the opposite side, and the fixed shape rail is extended over the entire length of the primary lining pipe axis and is arranged at many locations at equal intervals around the pipe. After finishing the mounting and fixing of the shape retaining rail, the cylindrical secondary lining main body inscribed in the shape retaining rail is assembled from the lining material. The lining material is shaped along the joint end of the lining material. The joint concavo-convex portions are sequentially joined in the circumferential direction, and the lining material is fitted with a fitting locking protrusion formed on the back side of each of the lining materials and a fitting locking recess of the shape retaining rail. The secondary lining is characterized in that it is held on the shape-retaining rail by mating locking, and after assembling the secondary lining main body, backfilling is applied to the gap between the secondary lining main body and the primary lining. Method. 2. The secondary lining main body is assembled by connecting the lining material provided with a joint concave portion on one side of both side edge portions and a joint convex portion on the other side in a direction around the pipe. Next lining method. The secondary lining main body is assembled by alternately connecting the lining material having joint concave portions on both side edges and the lining material having joint convex portions on both side edges in the direction around the pipe. Item 2. The secondary lining method according to Item 1. The fitting locking irregularities are arranged in at least one of the joint portions between the lining materials constituting the secondary lining main body and the intermediate portion in the width direction of each lining material. Item 4. The secondary lining method according to any one of Items 1 to 3.

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