JP2005054465A - Cut-off joint for element, and construction method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cut-off joint for an element, which can cope with a construction error and which does cause a problem such as rolling in excavation using the element, and a construction method for the cut-off joint. <P>SOLUTION: A joint structure of the element is used for constructing an underground structure by inserting a plurality of elements into natural ground by juxtaposing them, while a male joint 32 and a female joint 31, provided in the axial direction of each of the elements, are fitted together between the adjacent elements 21 and 22. In a joint part 30, a fixed gap 40 is made between an inner surface of the female joint 31 and the male joint 32 in a fitted state, and a cut-off material 50 composed of a flexible material is arranged in the gap 40, so as to prevent leakage of water from between the adjacent elements 21 and 22. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an element water-stop joint and an element water-stop joint construction method.

As a method of constructing an underground structure under a railroad track or road, etc., using a non-open-cut method, a plurality of elements are continuously inserted by propulsion or traction to construct a tunnel lining, and then excavate the interior of the lining to tunnel There is a method of building.
Such a construction method uses, for example, a reference lining element having a square cross section and a connecting lining element having a U-shaped cross section that is sequentially connected to the side portion thereof, and is provided with a male or female provided at the facing portion between adjacent elements. While fitting the joints, the lining elements are placed in a U-shape or B-shape and connected to construct an underground structure.

The joint part a provided in the element is made of steel, and as shown in FIG. 5, a straight part c and a curved part d are provided on the base part b, and a substantially C-shaped fitting groove f on the inner surface thereof. And a bulb-like bulged portion e is provided at the tip of the straight portion c so that the fitted state cannot be easily removed (see Patent Document 1).
When a lining wall composed of an element having such a joint portion a is used as the main body structure, the tensile force generated in the main body structure is propagated to the mutual elements through the joint portion. For this reason, there is only a small gap between the fitting joints a and a ′ (fitting groove f ′ and the straight part c and the bulging part e) to slide the element in the axial direction. In this configuration, the tensile force can be reliably transmitted.
JP 2000-120373 A JP-A-6-228946 JP 7-48831 A

The above-described conventional water-stopping joint for elements and this construction method have a small gap between the joints, so that (1) it is difficult to cope with construction errors and rolling, and (2) foreign matter such as earth and sand is in the gap. When mixed, the influence on the excavation of the element is large, and (3) there is a problem that only the linear construction can be performed and the curved construction cannot be performed.
Further, since the gap is small, (4) the grout material filled between the joint portions after the connection of the elements does not reach the whole, and the gap generated at this time causes the cause of water leakage.

  The water-stop joint of the element of the present invention inserts a plurality of elements into a natural ground in parallel by fitting male or female joints provided in adjacent element axial directions between adjacent elements. In the joint structure of elements used for construction, this joint portion is formed so that a gap of several mm to several tens mm is generated between the inner surface of the female joint and the male joint in a fitted state. The water-stopping material made of a flexible material is disposed in the gap to prevent water leakage between adjacent elements.

  The water-stopping joint of the element of the present invention is the above-described water-stopping joint of the element, wherein a water-stopping material is arranged outside the fitted female joint and the male joint, and the inner surface of the female joint and the male joint are arranged. Among the gaps provided between the joints, at least an opening that opens to the outside is closed.

Further, the construction method of the element water-stopping joint according to the present invention is such that the male and female joints between adjacent elements are fitted, and a primary water-stopping material is arranged outside the fitted joint, The opening of the gap provided between the inner surface of the female joint and the male joint is closed, and the inside of the gap provided between the inner surface of the female joint and the male joint is cleaned and excavated as necessary to obtain a secondary waterstop. Is secured, and a secondary water-stopping material is disposed at this placement location to prevent water leakage between adjacent elements.

The waterproof joint of the element of the present invention is formed such that a gap of several mm to several tens mm is formed between the inner surface of the female joint and the male joint in a state where the joint portion is fitted. It is the structure which arranges the water stop material which consists of flexible materials, and stops water. As a result, the position of the element can be adjusted while preventing water leakage from the element connection portion in this gap, so that it is possible to cope with construction errors and to prevent the occurrence of rolling due to the bias of the joint propulsion resistance. Furthermore, since the influence on the element excavation due to the mixing of foreign matter into the joint portion can be reduced, stable construction can be performed and curved construction can be performed.
Furthermore, when water stoppage is performed by a dual structure of a waterstop material that covers the outside of the joint portion and a waterstop material disposed in the gap between the joint portions, water leakage can be prevented more reliably.

<1> Overall Structure FIG. 4 is a diagram showing an extracted stage of the process of sequentially arranging along a rectangular tunnel while wrapping a plurality of small cross-section (missing circular) elements.
The element is composed of a reference element 21 that is first inserted into the ground, and a succeeding element 22 that is sequentially connected to the sides thereof, and the lining tunnel is filled between the steel material constituting the element and the space between them. It is built by integrating with concrete.
This form demonstrates the form which provided the joint part 30 in the upper and lower parts of the one side part of an element, respectively.

FIG. 1 shows a sectional view of a part of the joint structure of the element.
The present invention relates to a joint structure provided between adjacent elements 21 and 22, and the joint portion 30 is formed so that a gap 40 is formed between the inner surface of the female joint 31 and the male joint 32 in a fitted state. The water stop material 50 (hereinafter referred to as the secondary water stop material 50) is disposed in the gap 40 to prevent water leakage between the adjacent elements 21 and 22.
Further, a water stop material 60 (hereinafter, the water stop material disposed on the outer surface of the joint portion 30 is referred to as a primary water stop material 60) is also disposed outside the fitted male joint 32 and female joint 31.

In this example, the female joint 31 is provided in the preceding element 21 and the male joint 32 is provided in the succeeding element 22, but the present invention is not limited to this.
Hereinafter, each member will be described in detail.

<2> Joint part The joint part 30 is a part that connects the adjacent elements 21 and 22, and is disposed along the axial direction of the elements 21 and 22. There are two types of joints 30, a female joint 31 and a male joint 32, which are installed at the facing portions of the adjacent elements 21 and 22, and are engaged with each other to connect the elements 21 and 22.
The joint portion 30 is configured such that a gap 40 is generated between the inner surface of the female joint 31 and the male joint 32 in a fitted state. For this reason, the male joint 32 and the female joint 31 can be moved within the range of the gap 40, and as a result, the positions of the adjacent elements 21 and 22 can be adjusted. As a result, it is possible to prevent rolling due to unevenness of the joint propulsion resistance and the response when a construction error occurs. Furthermore, since it can arrange | position, adjusting the position of an element between this clearance gap 40, it can adapt also to curve construction.
The gap 40 can be provided in a range of several mm to several tens mm in consideration of design matters and the like.

As the male joint 32 provided in the succeeding element 22, for example, a member formed by bending a front end portion of a plate material disposed on the curved portion 224 (projecting portion 222) substantially vertically (bent portion 223) can be used. By providing the bent portion 223, a strong fitting state with the female joint 31 can be secured.
On the other hand, the female joint 31 provided in the reference element 21 includes a curved portion 213 protruding from the end of the partition wall 211 along the peripheral wall of the element 21, and a straight portion installed on the partition wall 211 at a certain distance from the curved portion 213. 214, and the straight portion 214 can be made of an L-shaped steel material.

When such a configuration is adopted, the gap 40 generated between the inner surface of the female joint 31 and the male joint 32 includes the tip of the curved portion 213 and the protruding portion 222, the curved portion 213 and the bent portion 223, the partition wall 211 and the bent portion 223, and the protruding portion. An interval of several mm to several tens of mm provided between the portion 222 and the linear portion 214 is said. Since the gaps 40, 40,... Are continuous, the inside and outside of the element joint portion 30 are in communication with each other.
In addition, the shape of this joint part 30 is not necessarily limited to the said form.

<3> Primary Water-Stopping Material The primary water-stopping material 60 is a member that is disposed outside the joint portion 30 between the elements 21 and 22 to prevent water leakage from the joint portion 30.
The primary water blocking material 60 should just block | close the opening part 41 open | released outside at least among the gap | intervals 40 which connect inside and outside. The primary water blocking material 60 is mainly intended to ensure temporary water blocking until a secondary water blocking material 50 described later is disposed.
As the primary water blocking material 60, a known grout material can be used. For example, cement paste, mortar, or the like is injected toward the ground outside the joint portion 30 and arranged.

The primary water blocking material 60 is injected, for example, by providing an injection pipe 70 penetrating inside and outside the partition 221 of the trailing element 22. The injection pipe 70 is arranged at a certain interval in the substantially vertical direction along the joint portion 30, and this interval is set to a dimension that allows the primary water blocking material 60 to continuously cover the outer surface of the joint portion 30. The injection tube 70 may be provided in the trailing element 22 in advance.

<4> Secondary waterproofing material The secondary waterproofing material 50 fits the female joint 31 provided in the elements 21 and 22 and the male joint 32, and arrange | positions in the gap | interval 40 produced between them, and is a joint part. 30 is a member for preventing water leakage from 30.
The secondary water stopping material 50 is not limited to temporary water stopping, and is intended to stop water permanently even after an underground structure is constructed.
The secondary water blocking material 50 is disposed in at least a part of the gap 40 communicating with the inside and outside of the joint portions 30 of the elements 21 and 22 to block the inside and outside of the elements 21 and 22.

  A member made of a flexible material is used for the secondary water stop material 50. For example, rubbers such as elastic rubber and water-swellable rubber, synthetic resin materials and the like can be used, and those having excellent stretchability, durability, water resistance and the like are preferable. Even if the distance of the arranged gap 40 changes due to this property, the shape can be deformed following the displacement, so water stoppage can always be secured, and when installing steel materials inside the lining tunnel, concrete filling, tunnel Water can be stopped during internal excavation in the lining and even after construction.

In the gap 40 in which the secondary water blocking material 50 is disposed, there may be a lubricant, a primary water blocking material 60, or the like. In this case, after removing these, the secondary waterproofing material 50 is arrange | positioned. As a removal method, for example, a perforated pipe 51 having a plurality of holes on the peripheral surface is inserted into the gap 40, and ultra-high pressure water is ejected from the holes to remove the lubricant and the like. Further, when the substance in the gap 40 is a solid, the solid is removed by pulverization with high-pressure water. And the secondary water stop material 50 is arrange | positioned in the produced space | gap.
At this time, it is preferable to clean the inside of the arrangement place simultaneously with the removal of the lubricant and the like.

Below, the method to construct | assemble the structure of the water stop joint of the elements 21 and 22 of this invention is demonstrated below.
In this example, the elements 21 and 22 are installed by using a method of pushing and propelling from the starting side of the element, but in addition to this, a traction device installed on the reaching side is used from the PC steel fixed on the excavator provided in front of the element. A HEP method (registered trademark) or the like that pulls the wire can also be adopted.

<1> Arrangement of preceding and following elements First, a reference element (preceding element 21) is installed along the outer shell of the tunnel.
A space having a crescent-shaped cross section is formed between the bulkhead 211 and the bulkhead 211 of the preceding element 21 inserted at a predetermined position, and a filler 80 is placed in the space to be solidified.

After the filler 80 is solidified, the filler 80 is disposed so that a part of the trailing element 22 is wrapped. The trailing element 22 is inserted into the ground along the female joint 31 provided in the preceding element 21 while the male joint 32 is fitted.
It is preferable to place a lubricant in the fitting groove of the female joint 31 in advance so that the male joint 32 can be easily fitted.
Since a gap 40 of several mm to several tens mm is formed between the female joint 31 and the male joint 32 between the female joint 31 and the male joint 32, Along with the insertion, resistance is generated in the joint portion 30 and troubles such as rolling do not occur. This also makes it possible to propel the element over long distances. Furthermore, even if foreign substances such as earth and sand are mixed in the gap 40 together with the insertion of the trailing element 22, the gap 40 is not small as in the conventional joint. Mixing can be allowed, and the influence on the excavation of the element is reduced accordingly.

<2> Injection of primary water-stopping material After arranging the preceding element 21 and the succeeding element 22 in parallel, the primary water-stopping material 60 is injected into the natural ground toward the fitting joint 30 (FIG. 2A )).
The primary water blocking material 60 is injected from an injection pipe 70 disposed at a predetermined interval along the male joint 32 of the trailing element 22.
The discharge port of the injection pipe 70 is disposed toward the opening 41 between the curved portion 213 of the female joint 31 and the protruding portion 221 of the male joint 32, and the opening 41 can be easily filled with the primary water blocking material 60. It is preferable to do so.
By injecting the primary water blocking material 60 in this way, the gap 40 formed between the male joint 32 and the female joint 31 can be filled, and water leakage from between the segments 21 and 22 is prevented.

<3> Injection of secondary waterproofing material After placing the primary waterproofing material 60, in the gap 40, the portion filled with the lubricant sandwiched between the inner surface of the curved portion 213 and the bent portion 223 of the male joint 32 is filled. A perforated pipe 51 for injecting and arranging the secondary water blocking material 50 is arranged.
Thereafter, high-pressure water is jetted from the perforated pipe 51, the sliding material around the perforated pipe 51 is removed, and a void portion in which the secondary water blocking material 50 is disposed is formed (FIG. 2 (b)).

After forming a gap of a predetermined size in the sliding material, a secondary waterproofing material 50 is injected into the gap, and the interior of the gap is completely filled with the secondary waterproofing material 50 (FIG. 2 (c)). . The secondary water blocking material 50 is injected by using the perforated pipe 51 also, or after the perforated pipe 51 is extracted, it is injected by other means. At this time, since the outer periphery of the gap is surrounded by the lubricant, the primary water blocking material 60 or the filler 80, the secondary water blocking material 50 does not leak into the gaps between the elements or to the ground.
After filling, a time corresponding to the properties of the secondary water blocking material 50 is taken to allow the secondary water blocking material 50 to exhibit flexibility.
Thus, the joint portion 30 is sealed in the gap 40 by the secondary water blocking material 50, and the inside and outside of the elements 21 and 22 are shielded.
After the secondary water blocking material 50 is disposed, it is possible to prevent the installation work of the steel material in the outer shell of the tunnel, the filling work of the concrete, and the water leakage after the structure is completed.

Thereafter, the succeeding element 22 is continuously inserted in the same manner to construct a lining tunnel.
According to the present invention, even when the lining tunnel meanders and has a curved portion in the middle of the tunnel, the joint portion 30 is provided with the gap 40, so that it can be continuously constructed as it is.

In addition, although the present Example demonstrated the method of constructing a rectangular tunnel using the water stop joint of an element, it is not limited to this shape, Underground structures of various cross-sectional shapes, such as circular and a horseshoe shape Of course, it can be constructed.
Further, the secondary water blocking material 50 disposed in the gap 40 may be disposed not only over a part of the gap 40 but also over the entire gap 40 to further increase the water blocking performance.

As described above, the female joint 31 of the element is constituted by the straight portion 214 provided on the partition wall 211 and the arc-shaped curved portion 213, but the distal end portion of the curved portion 213 is bent substantially parallel to the partition wall 211, 215 may be formed (see FIG. 3).
As a result, the secondary waterproof material 50 is sandwiched between the retaining portion 215 and the bent portion 223 on the left and right sides, and therefore, it is possible to exhibit a high water-stopping property particularly in the lateral displacement of the element.

The partial cross section figure of the water stop joint of the element of this invention. The construction process figure of the construction method of the water stop joint of an element. Sectional drawing showing the water stop joint of Example 2. FIG. Explanatory drawing in the middle of construction which wraps and arranges a plurality of elements. Explanatory drawing of the Example of the water stop joint of the conventional element.

Explanation of symbols

21 ... Leading element 22 ... Subsequent element 30 ... Joint part 31 ... Female joint 32 ... Male joint 41 ... Opening 50 ... Secondary waterstop 60 ... Primary water stop material

Claims (3)

In the joint structure of elements used to construct an underground structure by inserting a plurality of elements into a natural ground in parallel while fitting male or female joints provided in the element axial direction between adjacent elements. ,
This joint portion is formed such that a gap of several mm to several tens mm is generated between the inner surface of the female joint and the male joint in a fitted state.
A water-stopping material made of a flexible material is disposed in the gap to prevent water leakage between adjacent elements,
Water-stop fitting for element.
In the water stop joint of the element according to claim 1,
Place a water stop material on the outside of the fitted female joint and the male joint,
Of the gap provided between the inner surface of the female joint and the male joint, at least the opening that opens to the outside is closed,
Water-stop fitting for element.
In the construction method of the element water stop joint according to claim 2,
Mating male and female joints between adjacent elements,
A primary water blocking material is disposed outside the joint portion fitted, and the opening of the gap provided between the inner surface of the female joint and the male joint is closed,
Washing and excavating the gap provided between the inner surface of the female joint and the male joint as necessary to ensure the location of the secondary water stop material,
A secondary water stop material is placed at this place to prevent water leakage between adjacent elements.
Construction method of element water-stop joint.

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