JPS6115317B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is applicable to water supply systems, sewerage systems, public drains,
This invention relates to a joint for a shield construction method used to connect a cylindrical culvert made of concrete or steel such as an underground passage, and a cylindrical culvert constructed by assembling a plurality of segments.

Conventionally, as an underdrain joint, a short cylindrical flexible member made of rubber or synthetic resin is installed along the inner peripheral surface of the underdrain, and both ends of the flexible member are anchored to the inner peripheral wall of the underdrain to be connected. Alternatively, a bolt is provided on the back of the flexible member, and the cylindrical flexible member is suspended by the bolt, thereby minimizing distortion of the flexible member due to the difference in water pressure between the inside and outside of the culvert. and
The flexible member is designed to stop water and absorb relative displacement between the joints of opposing underdrains. However, when using any type of culvert joint, if the two connected culverts move away from each other in the axial direction due to uneven ground subsidence or relative displacement of the ground during an earthquake, a large amount of gap will be created between the culverts. Sediment from outside the culvert enters through the gap and deforms the flexible member inward, causing damage to the flexible member and impeding the flow inside the culvert. There was a problem of damaging the structure.

In order to solve these problems, the applicant of the present patent installed an anchoring member having a seat in the center and housing parts at each of the inner and outer circumferential positions on the opposite end surfaces of the underdrains to be connected, A flexible member is disposed between the seats of the anchoring member, and a rod-shaped load-bearing member is placed on the inner and outer periphery of the flexible member so that both ends thereof can be moved within a certain range to the casing of the anchoring member. A culvert joint has been proposed in which a large number of culverts are inserted and arranged side by side, thereby allowing appropriate displacement between both culverts, preventing the joint from splitting, and preventing harmful deformation of the flexible member. . However, if only the primary lining is required to run the main water pipe through the culvert, load-bearing members should be installed at both the inside and outside of the flexible member at the joints of the culvert. As a result, the wall thickness of the underdrain joint inevitably becomes large, which may cause problems in terms of space, and there is also the problem that the load-bearing member itself requires a considerable amount of work to assemble and increases costs. In particular, when constructing a culvert using the shield method, ease of assembly is particularly required.

In order to suppress this kind of problem, the present invention maintains the previously proposed functions of preventing joint separation of underdrain joints and protecting flexible members, while reducing the number of structural members, especially load-bearing members, etc. The object of the present invention is to provide a joint for an underdrain for shield construction that solves problems such as space, assembly, and cost by fundamentally changing the configuration.

EMBODIMENT OF THE INVENTION Below, one Example of the joint of the underdrain for shield construction method of this invention is demonstrated according to a figure.

In Figure 1, water supply culverts A and A' with primary linings are shown as culverts to be connected, which are constructed by assembling cylindrical concrete or steel segments that are divided circumferentially into multiple pieces using the shield construction method. has been done. However, the shape and type of the culverts A and A' are not limited to circular ones, for water supply, but may be other shapes such as rectangular, or other types such as sewers, underground passages, etc. An underdrain joint B is interposed between the underdrains A and A' to be connected, if necessary, via joint segments A ₁ and A' ₁ (not necessary).
Usually, this culvert joint B is installed in a place where uneven ground subsidence is expected, for example, in a culvert near a shaft.

Figure 2 shows the cross-sectional configuration of the joint B of the culvert. In the figure, symmetrical members can be identified by adding a dot to the reference numeral of one member. Omit explanations as necessary. In FIG. 2, the joint B of the underdrain consists of a pair of anchoring members 10, 10' anchored to the end faces of the underdrains A, A' to be connected, and the pair of anchoring members 10, 10'.
A large number of load-bearing members 20 are arranged in parallel between
A flexible member 30 made of rubber or synthetic resin is disposed astride between the two anchoring members 10, 10', and a flexible member 30 is disposed on the outer periphery of the anchoring members 10, 10' so as to cover the gap between the two anchoring members 10, 10'. It has a cover means 40.

The anchoring member 10 has a housing part 12 having an opening 11 on one side, and an extending part 13 extending toward the anchoring member 10' facing in the joint axial direction at the outer peripheral position of the housing part 12. As shown in FIGS. 1 to 3, the joint is made up of a plurality of divided segments assembled into a cylindrical shape in the circumferential direction of the joint. This circumferential assembly of the joint is performed using a connecting portion 14 provided on the underdrain A side of the housing portion 12 as a part of the anchoring member 10.
It is carried out by. That is, the connection part 14
has an end plate 15 extending in the joint axial direction on the joint circumferential end face of the segment, and by aligning this with the end plate 15 of the connecting portion 14 of the adjacent segment, the end plate 1
This is done by inserting a bolt into a bolt hole 16 formed in 5 and tightening the segments together. The joint inner circumferential side constituent members of the housing portion 12 have a structure that can be attached to and detached from the remaining constituent members of the anchoring member 10 at both ends of the segment.
By removing this detachable portion 17, the end portion of the load-bearing member 20 can be inserted into the housing portion 12. Further, as shown in FIG. 3, the detachable part 17 has a structure in which it is attached across the segments of two adjacent anchoring members 10.
Adjacent segments of anchoring members 10 are also connected in the circumferential direction of the joint. The anchoring member 10 can be attached to the culvert A by embedding an anchor (not shown) provided on the end surface of the anchoring member 10 on the culvert A side in the case where the culvert A is made of concrete, as in the conventional method. Alternatively, if the underdrain is made of segments made of concrete or steel, this is done by bolting the anchoring member 10 to the underdrain A.

The load-bearing member 20, which is installed across the anchoring members 10 and 10', has both ends inserted into the housing parts 12 and 12' through the openings 11 and 11' so that it can move within a certain range and cannot be removed. It consists of a rod-shaped body. A large number of force-bearing members 20 are arranged in parallel between the anchoring members 10 and 10', and a kind of cylindrical body is formed by this group of force-bearing members. A protrusion 21 is formed at the end of the load-bearing member 20, and by making the height h ₁ of this protrusion 21 larger than the height h ₂ of the opening 11 of the casing 12 of the anchoring member 10. , to prevent the joint from coming off in the axial direction. Adjacent load-bearing member 2
The spacing between the 0 and 20 joints in the circumferential direction is regulated to prevent deviation from occurring and a large gap between the load-bearing members 20, 20. Figures 2 and 4
6 to 6 show that the spacing between the load-bearing members 20, 20 is regulated by attaching a comb-shaped plate piece 22 to the casing 12 with bolts and using an appropriate number of load-bearing members (two in the figure) between the comb teeth. A case is shown in which this is achieved by inserting and supporting the member 20. However, the spacing between the load-bearing members is not limited to this illustrated example; for example, the spacing may be regulated by interposing a joint material 23 made of rubber, synthetic resin, asphalt, etc. between the load-bearing members 20, 20, In addition, the load-bearing member is composed of two types of load-bearing members: a load-bearing member with a protrusion and a load-bearing member with a hole, and the mutual positional relationship is regulated by inserting the protrusion into the hole. The interval regulating means may be arbitrarily selected.

Anchoring member 1 at the outer peripheral position of 20 load-bearing members
At the inner peripheral position of the extension portions 13 and 13' of 0 and 10',
A flexible member 30 made of rubber or synthetic resin is provided astride between the anchoring members 10, 10'. Flexible member 3
0 consists of a short cylindrical body formed, for example, in a corrugated cross-sectional shape so as to be able to sufficiently follow the relative displacement between the underdrains A and A'. The end of the flexible member 30 is formed in a shape that follows the end surface of the casing 12, and by clamping this end between the casing 12 and the holding plate 31 and tightening it with a bolt 32, the anchor can be secured. It is fixed to the member 10 in a watertight manner. As a result, watertightness between the inside and outside of the underdrains is maintained regardless of the presence or absence of relative displacement between the underdrains A and A'. The bending of the flexible member 30 due to the pressure difference between the inside and outside is supported by the extended portions 13, 13' of the 20 load-bearing members and the anchoring members 10, 10', as will be described later. Reinforcement rings 32, 32' are attached to the ends of the extension parts 13, 13' by welding or the like to prevent bending of the extension parts 13, 13'.

The cover means 40 provided on the outer periphery of the anchoring members 10, 10' is stretched along the outer periphery of a thin steel skin plate 41 fixed to the outer periphery of the anchoring members 10, 10' by welding or the like. Cover rubber 4 made of elastic material such as rubber or synthetic resin
It consists of 2. The deformable cover means 40 consisting of the skin plate 41 and the cover rubber 42 functions as an auxiliary means for maintaining watertightness after constructing the underdrain.
Until the flexible member 30 is installed across the gap 0', the inflow of earth, sand, and water is prevented, thereby making it easy to assemble the flexible member 30 or the load-bearing member 20. In the illustrated example, the end of the cover rubber 42 is bent along the end surface of the anchoring member 10 on the culvert A side to improve watertightness.
The bent portion may be omitted.

Water supply pipes (not shown) are arranged inside the culverts, and mortar is partially filled between the culverts A, A' and the water supply pipes as necessary. However, it is not limited to this, so
The detailed explanation of the above contents will be omitted.

For the underdrain joint B having the above configuration,
When there is no relative displacement between the underdrains A and A', watertightness is maintained by both the flexible member 30 and the cover means 40, and the internal pressure applied to the flexible member 30 is reduced by the extension portion 13. External pressure such as earth and sand applied to the cover means 40 is also supported by the extending portion 13.

When a relative displacement occurs between the culverts A and A', the cover means 40 is moved between the thin steel plate 41 and the cover rubber 42.
Therefore, the skin plate 41 follows the displacement up to a certain amount and maintains a watertight state, but when the displacement exceeds a certain amount, the skin plate 41 first breaks, and if the displacement progresses further, the cover rubber 42 also breaks. becomes. However, even in this state, the flexible member 30 can sufficiently follow the displacement and deform, so that a sound watertight state inside and outside the culvert is maintained.

At the time of displacement between the underdrains A and A', the force-bearing member 20 acts as follows. That is, when a displacement occurs between the underdrains A and A' in the axial direction of the underdrains, the tip of the force-bearing member 20 contacts the wall surface of the casing part 12 in the case of the adjacent direction, preventing further displacement of the underdrains and separating them. In the case of displacement in the direction shown in FIG. Furthermore, when a displacement occurs between the underdrains A and A' in the direction perpendicular to the underdrain axis direction, the state in which the 20 load-bearing members are arranged side by side changes from the state shown in FIG. 5 to the state shown in FIG. 6, and the load-bearing members 20, 20 Comrade's side gap e
becomes small and eventually reaches almost zero, and further progress of displacement is restricted. Therefore, the load-bearing member 2
0 group, the displacement between the culverts A and A' is limited to a certain amount both in the axial direction of the joint and in the direction perpendicular to the axial direction of the joint. Underdrains A and A' are not forced to deform to the extent that they are damaged, and the culverts A and A' always maintain a watertight state while allowing an appropriate amount of relative displacement.

In addition to this function, the load-bearing member 20 supports the flexible member 30 so that the flexible member 30 does not bulge inward due to earth and sand that enters through the gap between the extension portions 13 and 13' when the cover means is damaged. has the effect of
Although the external pressure caused by earth and sand can be quite large, the load-bearing member 20 is designed to sufficiently withstand it, so it can provide sufficient support and prevent excessive pressure on the flexible member 30 toward the inner circumference of the culvert. There will be no damage due to deformation, obstruction of flow within the culvert, or damage to structures installed within the culvert.

The functions and actions described above are performed by one stage of 20 groups of load-bearing members, one stage of flexible member 30, and one stage of cover means 40, and the load-bearing members are provided at the inner and outer peripheral positions of the first stage of flexible member. In other words, the space in the joint wall thickness direction is large due to the structure in which one stage of load-bearing members is removed, although the function and action are more consistent than when two stages of load-bearing members are provided. Width is saved. Along with this, it becomes easier to assemble the underdrain joint, and there are also effects other than the underdrain joint itself, such as the amount of horizontal shaft excavation required for installing the underdrain joint.

Therefore, when using the joint of the underdrain for shield construction method according to the present invention, there is a casing part provided with an extension part, and between the anchoring members attached to the end face of the culvert to be connected, there is a space inside the casing part. A large number of force-bearing members whose ends are movably supported within a certain range and cannot be removed are installed astride them, and a flexible member is installed astride the outer circumferential position and the inner circumferential position of the extension part. In addition, since the cover means is provided at the outer circumferential position of the anchoring member so as to span both anchoring members, even if a relative displacement occurs in the underdrain to be connected, it can be followed and the watertightness of the underdrain can be ensured. In addition, even if water pressure, external pressure due to intrusion of earth and sand, etc. are applied, harmful deformation of the flexible member etc. can be prevented. In addition, compared to the case where load-bearing members are placed on both the inner and outer circumferences of the flexible member, it is possible to save space and reduce the size of the flexible member. The amount can be reduced. In particular, by providing an extension part on the anchoring member and providing a cover means, it is possible to stop water and prevent the inflow of earth and sand when constructing a culvert in the shield method, and to assemble flexible members and load-bearing members. It can be easily attached. Further, before and after constructing the underdrain, the extending portion of the anchoring member functions as a support member for the cover means, and after constructing the underdrain, it is possible to restrict outward expansion of the flexible member due to internal pressure.

[Brief explanation of the drawing]

Fig. 1 is a front view schematically showing a partially sectional view of the underdrain joint of the present invention used for connecting an underdrain; Fig. 2 is a partially enlarged sectional view of the underdrain joint of Fig. 1; Figure 3 is a cross-sectional view along the - line in Figure 2 with diagonal lines applied to the attachment/detachment part, Figure 4 is a view taken in the direction of arrow P in Figure 2, and Figure 5 is the proof stress before relative displacement occurs between the culverts. FIG. 6 is a side view of the load-bearing member portion after relative displacement has occurred between the underdrains. A, A'...Drain to be connected, B...Drain joint, 10, 10'...Anchoring member, 11, 11'...
Opening, 12, 12'... Housing part, 13, 13'...
Extension part, 14, 14'... Connection part, 17, 17'...
...Detachable part, 20... Load-bearing member, 21, 21'...
Projection, 22, 22'... comb-shaped plate piece, 23... joint material, 30... flexible member, 40... cover means,
41...Skin plate, 42...Cover rubber.

Claims (1)

[Claims] 1. A housing having an opening on one side and an extending portion extending in the joint axis direction at an outer peripheral position of the housing, the openings of the housing facing each other and A plurality of segments are assembled in a cylindrical shape in the circumferential direction of the joint, and a pair of anchoring members is provided to be attached to each of the opposing end surfaces of the underdrain to be connected; between the pair of anchoring members, an end portion is provided. is provided with a large number of rod-shaped load-bearing members arranged in parallel, which are inserted into the housing through the opening so as to be movable within a certain range and cannot be removed from the housing; the outer periphery of the load-bearing members; a short cylindrical flexible member having an end attached to the pair of anchoring members and extending between the pair of anchoring members at the inner peripheral position of the extending portion of the housing portion; for a shield construction method, characterized in that a deformable cover means is provided on the outer periphery of the housing portion of the pair of anchoring members to cover the gap between the extending portions of both the anchoring members. Culvert joint. 2. The underdrain joint according to claim 1, wherein the cover means comprises a skin plate and cover rubber attached to the outer periphery of the skin plate.