JPH0619155B2 - Connection structure between structure and underdrain - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a connection structure between a structure such as a shaft and an underdrain connection structure for a subway and an underdrain connection structure.

[Conventional technology]

When connecting a structure such as a shaft for a conventional subway to an underdrain, in order to absorb the relative displacement between the structure and the underdrain due to the subsidence of the underdrain due to the subsidence of the ground, etc., on the outside of the structure The structure and the underdrain are connected by a tubular flexible expansion joint made of a flexible member such as rubber.

[Problems to be Solved by the Invention]

In the conventional structure and underdrain connection structure, since the structure and the underdrain are connected by the flexible expansion joints thus arranged on the outside of the structure, the expansion joint is directly subjected to a large external earth pressure. Therefore, a pressure resistant structure having an extremely large strength must be formed, and there is a problem that the manufacturing cost increases.

The present invention has been made to solve this problem, and it is possible to use an expansion joint having a simple structure and a low manufacturing cost, and a structure due to the settlement of an underdrain due to the settlement of the ground. It is intended to provide a novel structure and an underdrain connection structure capable of sufficiently absorbing the relative displacement between the underdrain and the underdrain.

[Means for Solving the Problems]

The structure and the underdrain connection structure of the present invention that achieves the above-mentioned object are provided with an opening communicating with the internal space of the structure and having a diameter larger than the outer diameter of the underdrain in the structure. The end portion of the underdrain is disposed, and the deformation amount due to the total load of the underdrain's own weight and the underdrain load is less than a predetermined amount between the lower outer peripheral surface of the underdrain end and the corresponding lower peripheral surface of the opening of the structure A support material is provided that deforms a predetermined amount by following the settlement of the underdrain when a predetermined amount of load is applied to the underdrain due to ground subsidence, etc., and the end of the underdrain and the structure are arranged in the opening. It is characterized in that they are connected by a tubular flexible expansion joint.

[Work]

According to the present invention, the flexible expansion joint for connecting the underdrain end and the structure is arranged not in the outside of the structure but in the opening provided in the structure, so that it is not directly subjected to the external earth pressure,
It simply fulfills the function of flexibly expanding and contracting in a state where the water stopping property is maintained following the subsidence of the underdrain due to the subsidence of the ground.

In addition, the total weight of the weight of the underdrain and the load inside the underdrain (for example, water, a car passing through the underdrain, a train, etc.) between the lower peripheral surface of the end of the underdrain and the corresponding lower peripheral surface of the opening of the structure. When the amount of deformation due to is less than a predetermined amount and a predetermined amount of load is applied to the underdrain due to ground subsidence, etc., by providing a support material that follows the subsidence of the underdrain and deforms a predetermined amount during normal use In, the underdrain is supported in the opening of the structure by the support material without substantially subsidence, and when a large amount of load is applied to the underdrain due to ground subsidence, etc., the support material follows the subsidence of the underdrain. It deforms by a predetermined amount to absorb the displacement of the underdrain.

In the present specification, the "lower outer peripheral surface of the underdrain end" means the lower portion on which the total load of the inner weight of the underdrain and the internal load of the underdrain is applied, and not necessarily the outer circumference. It does not mean the bottom half of the plane.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The illustrated embodiment is one in which the present invention is applied to a connection structure of a shaft and an underdrain for a subway.

The outer wall 1a of the vertical shaft 1 is provided with an opening 1c communicating with the internal space 1b of the vertical shaft 1. The opening 1c has a diameter larger than the outer diameter of the underdrain 2 to be connected, and the end 2a of the underdrain 2 is arranged so as to be fitted into the opening 1c. The underdrain 2 is constructed by a shield construction method, and is formed by winding a secondary winding concrete 2c inside a shield segment 2b.

The outer peripheral surface of the lower half of the end 2a of the underdrain 2 and the opening 1 of the shaft 1
A semi-annular support member 3 is arranged between the corresponding lower half peripheral surface of c. This support member 3 is composed of a large number of segment-shaped members 3a, and the deformation amount due to the total weight of the weight of the underdrain 2 and the load within the underdrain, that is, the weight of water normally present in the underdrain 2 and the weight of the train passing through the underdrain 2 It is a small deformation amount equal to or less than a predetermined amount, and when a predetermined amount of load is applied to the underdrain 2 due to ground subsidence or the like, it is deformed by a preset amount following the subsidence of the underdrain 2.

As a result of experiments, it was found that, for example, closed-cell foam urethane rubber and closed-cell sponge rubber are suitable as the support material 3. For example, the total load of the underdrain 2's own weight and the load in the underdrain is 10 t / m ² , the expected subsidence amount when the underdrain 2 sinks due to ground subsidence, etc. is 15 cm, and the load applied to the support material 3 at this time is 30 t / m ² When set to, the closed-cell urethane foam rubber will not be deformed as shown in the compression curve in Fig. 5 when the total weight of the underdrain 2's own weight and the underdrain load is 10 t / m ^2, that is, when the underdrain 2 is normally used. Without supporting the underdrain 2, the closed cell urethane rubber is deformed by about 50% when a load of 30 t / m ² is applied to the underdrain 2 for sinking due to ground subsidence or the like. Therefore, if the support material 3 having a thickness of 30 cm is formed from the closed-cell urethane rubber and arranged in advance, the support material 3 can be deformed and settled by following the settling of the underdrain 2 by an expected settling amount of 15 cm. When the closed-cell sponge rubber is used as the support material 3 under the above-mentioned conditions, the support material 3 is deformed by about 4% in the normal use of the underdrain 2 from the compression curve of FIG.
When a load of 0 t / m ² is applied, it deforms by about 40%. Therefore, if the indicator material 3 having a thickness of 37.5 cm is formed by the closed-cell sponge rubber and arranged, the support material 3 is deformed by a small amount of about 1.5 cm when the underdrain 2 is normally used. When the underdrain 2 subsides due to ground subsidence, it will deform and settle by an expected subsidence amount of 15 cm.

As the support material 3, it is preferable to use a material having a large reaction force from the initial deformation on the compression curve and a constant reaction force or a small change over a deformation amount of several tens of percent, as a material having such performance. In addition to the above-mentioned closed-cell urethane foam, closed-cell sponge rubber, styrene foam may be used. In short, it is possible to support the underdrain 2 without subsidence during normal use of the underdrain 2, and the underdrain 2 is settled due to ground subsidence or the like. When attempting to do so, any material can be used as long as it can follow the settlement of the underdrain 2 and deform and sink by the expected settlement amount.

The shape of the support material 3 is a fender shape, a honeycomb structure, or a shape in which a large number of voids 3b are formed in the support material 3 as shown in FIG. 4 and urethane foam polystyrene is embedded in these voids 3b. Use as appropriate.

Also, from FIG. 5, the amount of deformation of the solid rubber is too small when the underdrain 2 is about to sink. Therefore, in order to obtain the amount of deformation of the support material 3 equal to the expected amount of underdrain, the thickness of the solid rubber should be very small. It must be made large, and in general, open-cell sponge rubber is already about 7 in normal use.
It is 0% deformed, and when the underdrain 2 is about to sink, there is no room for deformation by the amount of deformation equal to the expected amount of underdrain 2 sinking, and the underdrain 2 will be destroyed, so both are suitable as support materials 3. I understand that it is not.

The support material 3 has a function of supporting the above-mentioned underdrain 2 and a function of preventing deformation of the underdrain 2 by deforming following the settlement of the underdrain 2, and also prevents earth and sand from flowing into the shaft and the underdrain 2 from the outside. Have the function to

Between the outer peripheral surface of the upper half of the underdrain 2 and the peripheral surface of the corresponding upper half of the opening 1c of the vertical shaft 1, a semi-annular earth and sand inflow prevention material 4 is provided.
Is provided. A ring-shaped earth and sand inflow prevention member 5 is arranged between the end surface 2d of the underdrain 2 and the corresponding end surface 1d of the vertical shaft 1 over the entire circumference. The earth and sand inflow prevention material has only the function of preventing the earth and sand from flowing into the shaft 1 and the underdrain 2 from the outside by the opening when the underdrain 2 sinks, and has the function of supporting the underdrain 2 like the support material 3. I don't have it. As the earth and sand inflow preventing members 4 and 5, for example, soft sponge which is appropriately compressed and deformed may be used. Reference numeral 13 is a cover rubber.

The end 2a of the underdrain 2 and the vertical shaft 1 are connected to each other by a cylindrical flexible expansion joint 7 arranged in the opening 1c of the vertical shaft 1. As shown in the enlarged view of FIG. 3, the flexible expansion joint 7 is an anchor material 9a in which an end portion 8a of a flexible water blocking member 8 made of rubber, synthetic resin or the like is embedded in the secondary winding concrete 2c of the underdrain 2. And the anchor material 9b embedded in the outer wall 1a of the shaft 1 is fastened with bolts 10 and 10. The flexible water blocking member 8 is fastened via push plates 11, 11. These push plates 11, 11 have a shape obtained by dividing an annular metal plate into a plurality of segments, as shown in an enlarged scale in FIG.
An appropriate number of bolt insertion holes 11a are formed in the central portion, and a protrusion 11b for restricting the bolt tightening amount is provided at one end.
Has a protrusion 11c at the other end, which protrudes in the opposite direction to the protrusion 11b and is formed on the outside on a smooth surface having no corners to prevent damage to the flexible expansion joint. Reference numeral 11d is a protrusion for locking a cap described later. The flexible water blocking member 8 is fastened by connecting a plurality of pressing plates 11 having the above-mentioned configuration in an annular shape, inserting the bolt 10 into the bolt insertion hole 11a, and screwing it into the anchors 9a and 9b. 12 and 12 are push plates 11 after the bolts are inserted.
Central recess 1 defined by each projection 11c, 11d of the
It is a cap fitted in 1e. The push plate 11 is a protrusion 11
Since the outer side of c is formed into a smooth surface, the flexible water blocking member 8 is deformed by water pressure, and when the surface is pressed against the pressing plate 11, the flexible water blocking member is prevented from being damaged. Also, the protrusion 11b
Since the flexible water blocking member 8 is provided, the flexible water blocking member 8 is prevented from rotating around the bolt when it is pushed outward by water pressure, thereby preventing the flexible water blocking member 8 from opening. The flexible water blocking member 8 has a slack toward the inside of the opening 1c from the end of the underdrain and the end 8a attached to the structure, and swells toward the outside of the opening 1c at the center. It is arranged. By arranging in this way, the flexible expansion joint 7 is provided with a flexible water stop member longer than the conventional flexible expansion joint, and follows a larger deformation than the conventional flexible expansion joint. be able to. Flexible expansion joint 7
Is located inside the opening 1c and does not directly receive external earth pressure, and simply follows the subsidence of the underdrain 2 due to the subsidence of the ground, etc., so that it can be flexibly expanded and contracted while maintaining the water stoppage. , Such a simple structure is sufficient.

In the above-mentioned embodiment, the support material 3 is arranged between the outer peripheral surface of the lower half of the underdrain end 2a and the peripheral surface of the corresponding lower half of the opening 1c of the vertical shaft 1. The range of the lower peripheral surface of the underdrain to be disposed and the corresponding lower peripheral surface of the opening of the structure can be set arbitrarily without being limited to this, and when the shape of the underdrain is a quadrangle or a horseshoe, etc., The support material may be disposed only between the outer bottom surface and the corresponding bottom upper surface of the opening of the structure.

Further, in the above-mentioned embodiment, the earth and sand inflow preventing material 5 is the underdrain 2.
Is disposed between the outer peripheral surface of the upper half and the corresponding peripheral surface of the upper half of the opening 1c of the vertical shaft 1.
The arrangement range is not limited to this, and is provided in the space above the space in which the support material 3 is provided between the outer peripheral surface of the underdrain end and the corresponding peripheral surface of the opening of the structure. Just do it.

〔The invention's effect〕

As described above, according to the present invention, the flexible expansion joint that connects the underdrain end and the structure is disposed in the opening provided in the structure, so that it is not directly subjected to the external earth pressure. It is only necessary to flexibly expand and contract by following the settlement of the underdrain due to the settlement of the ground. Therefore, it is not necessary for the flexible expansion joint to have a pressure resistant structure having a large strength, and a simple structure is sufficient, and therefore manufacturing costs can be greatly saved.

In addition, the deformation amount due to the total weight of the underdrain's own weight and the load in the underdrain is less than a predetermined amount between the lower outer peripheral surface of the underdrain end and the corresponding lower peripheral surface of the opening of the structure. By arranging a support material that deforms a predetermined amount following the sinking of the underdrain when a predetermined amount of load is applied to the underdrain, the underdrain does not substantially sink during normal use. It is supported in the opening of the structure, and when a large amount of load is applied to the underdrain due to ground subsidence etc., the support material can be deformed by a certain amount following the settlement of the underdrain to absorb the displacement of the underdrain. .

Since the support material is much cheaper than the manufacturing cost of the flexible expansion joint, according to the present invention, by combining the flexible expansion joint of a simple structure and the inexpensive support material, the structure and the underdrain While reducing the manufacturing cost of the connection structure, it is possible to sufficiently absorb the relative displacement between the structure and the underdrain due to ground subsidence or the like.

[Brief description of drawings]

1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a view taken along the line AA in FIG. 1, and FIG. 3 is an enlarged view showing the lower connection structure of FIG. FIG. 4 is a perspective view showing an example of a support material, FIG. 5 is a graph showing compression curves of various materials, and FIG. 6 is an enlarged view of a push plate of a flexible expansion joint.
FIG. 6A is a front view thereof, and FIG. 6B is a side view thereof. 1 ... Structure (vertical shaft), 1b ... Internal space of structure, 1c ... Opening, 2 ... Dark conduit, 2a ... Dark conduit end, 3 ... Supporting material, 7 ... Flexible expansion joint

Claims (7)

[Claims] 1. A structure is provided with an opening communicating with an inner space of the structure and having a diameter larger than an outer diameter of the underdrain, and an end of the underdrain is arranged in the opening, and a lower part of the end of the underdrain is provided. Between the outer peripheral surface and the corresponding lower peripheral surface of the opening of the structure, the deformation amount due to the total load of the underdrain's own weight and the underdrain load is not more than a predetermined amount, and due to ground subsidence, etc. A support material that deforms a predetermined amount following the subsidence of the underdrain when a load is applied is arranged, and the end of the underdrain and the structure are connected by a tubular flexible expansion joint arranged in the opening. The connection structure between the structure and the underdrain characterized by that. 2. The connection structure according to claim 1, wherein the support material is closed-cell urethane rubber. 3. The connection structure according to claim 1, wherein the support member is a closed-cell sponge rubber. 4. A sediment inflow prevention material is arranged in a space above the space where the support material is arranged between the outer peripheral surface of the underdrain end and the corresponding peripheral surface of the opening of the structure. The connection structure according to claim 1, wherein: 5. The connection structure according to claim 4, wherein the earth and sand inflow preventing material is a soft sponge which is appropriately compressed and deformed. 6. The flexible expansion joint comprises a flexible water blocking member made of rubber, synthetic resin or the like, and the flexible water blocking member has an appropriate number of bolt insertion holes at its central portion, and a bolt at one end. A protrusion for restricting the amount of tightening is provided at the other end, which protrudes in the opposite direction to the protrusion and has a protrusion for preventing damage to the flexible expansion joint formed on the outer surface with a smooth surface without corners. The connection structure according to claim 1, wherein the connection structure is fastened to the underdrain end and the structure through a pressing plate. 7. The flexible expansion joint has slack toward the inside of the opening from each end attached to the underdrain end and the structure, and is directed toward the outside of the opening at a central portion. The connection structure according to claim 1, further comprising a flexible water blocking member that bulges out.