JPH0323701B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to a structure such as a culvert or an underground passage made by connecting ready-made box culverts.

[Problem to be solved by the invention]

In structures such as culverts and underground passages formed by connecting box culverts by butting their ends together, when uneven ground subsidence occurs, the connection between the box culverts often comes off or breaks, impairing water-stopping properties. There were many.

For example, as shown in Figure 6, if a culvert is constructed by driving support piles 1 into the ground at predetermined intervals and connecting box culverts 2 with prestressed PC steel bars 3, the ground between the support piles 1 and When uneven settlement occurs, in many cases, strain concentrates at the connection between the box culverts 2 and 2 on the support pile 1, creating a gap 4 between the box culverts 2 and 2 as shown in Figure 7.
The water stop property can be lost. This occurs even when prestress is introduced into the prestressed steel bars and they are connected, or when box culverts are connected by fitting the uneven edges of the ends onto a regular foundation without support piles.

This invention was made in view of the above circumstances. The purpose is to propose a box culvert connected structure that absorbs the strain caused by ground subsidence and does not reduce its water-stopping properties.

[Means to solve the problem]

This box culvert connection structure is a structure formed by connecting a plurality of ready-made box culverts, in which a part of the box culvert is replaced with a ready-made strain-absorbing box culvert, and the strain-absorbing box culvert is arranged in the width direction. It is made by connecting two halves cut along the direction with a flexible connecting member, and the flexible connecting member consists of a hollow annular body and annular anchor pieces projecting from both sides of the hollow annular body, and these anchor pieces are connected to the opposite two parts. It is characterized by being buried within the split end face.

[Effect]

This structure is constructed by replacing a part of the prefabricated box culvert with a strain-absorbing box culvert, which is made by connecting two halves with a flexible connecting material, at a certain rate or at intervals, so uneven settlement etc. If such a strain occurs, the strain can be absorbed by the flexible connecting material of the strain-absorbing box culvert, and the structure is unlikely to be damaged or lose its watertightness.

This structure simply replaces a part of the ready-made box culvert with a ready-made strain-absorbing box culvert, and does not require complicated connection work using flexible connecting materials on site. They can be constructed by connecting them by connecting them with rods, or by fitting the concave and convex portions of the end faces, and can reliably exert their strain absorption function.

Since strain-absorbing box culverts are manufactured in a factory, they are more reliable in quality and can be obtained at lower cost than those cast on-site or connected using flexible connecting materials on-site.

The flexible connecting member 7 has flexibility, and the central hollow annular body 8 has a large amount of deformation due to its hollow portion, and expands and contracts by closely following the deformation of the 4 part between the two divided bodies 6, 6. , exhibits great strain absorption ability. Further, the annular anchor pieces 9 extending from both sides of the hollow annular body 8 are 2
It is embedded in the end face of the divided body 6 and firmly locks the annular body 8 to prevent damage to the connecting portion.

〔Example〕

This will be explained below with reference to the illustrated embodiments. 1st,
Figures 2 and 3 show a ready-made strain-absorbing box culvert 5 that forms part of this box culvert structure.
It has a rectangular cross section and is made up of two halves 6, 6 cut along the width direction at the central part in the length direction. The two halves 6, 6 are connected by a square annular flexible connecting member 7 disposed between opposing square annular end faces. The connecting member 7 is made of a flexible material such as rubber or highly flexible plastic, and consists of a hollow annular body 8 with a square cross section and annular anchor pieces 9 extending from both sides of the hollow annular body 8. The anchor pieces 9 on both sides are embedded in the end faces of the opposing two-part body 6, and the hollow annular body 8 is sandwiched between the end faces.

The connecting member 7 that connects the two divided bodies 6, 6 in this way
Between the outer end faces, annular strips 10, 10 are disposed with both side edges thereof embedded and locked in the end faces, respectively, and the space between the end faces is closed. Incidentally, the annular strip 10 may be made of a thin iron plate or the like, and may be secured within the end surface with an anchor 11 as shown in FIG. Also,
It is also possible to fill the space between the inner and outer end surfaces of the connecting member 7 with a filler material having low rigidity to close it. By closing the air space in this way, it is possible to prevent the connecting member 7 from coming into contact with surrounding earth and sand or running water in the box culvert.

The hollow annular body 8 of the connecting member 7 may have an elliptical, octagonal, oblong elliptical or rectangular cross section as shown in FIGS. 4a, b, c and d, in addition to the above-described square cross section.

Figure 5 shows a ready-made strain-absorbing box culvert 5.
This is a structure according to the present invention, in which ready-made box culverts 2 are connected to both ends of the box culvert. The strain-absorbing box culvert 5 has its central connecting member 7 placed on the support pile 1, and the box culvert 2, which is continuous with the front and rear halves 6, 6, is connected by a prestressed PC steel bar 3. has been done.

In this structure, when uneven ground settlement occurs between the support piles 1 and 1, the connecting member 7 expands or contracts.
It bends with the connecting member 7 closing between the two divided bodies 6, 6, and can absorb distortion without damaging or impairing water-stopping properties.

In addition to placing the box culvert 5 on the support pile 1, the box culvert 5 is placed in the central part between the support piles 1,
Alternatively, when constructing a culvert underground passage by placing box culverts on a foundation made of concrete, chestnut stone, etc. without erecting support piles, it is possible to prevent uneven settlement of the ground by arranging them at a specified distance. can.

Note that the annular strip 10 of the strain-absorbing box culvert of the embodiment deforms according to the deformation between the end faces.
If the amount of deformation is large, it will fall off.

〔Effect of the invention〕

This invention is as described above, and since this structure is constructed using a strain-absorbing box culvert in part, it can absorb the strain caused by uneven ground subsidence and prevent a decrease in water-stopping performance and damage. . It can also be constructed by simply connecting ready-made box culverts.
A highly reliable structure with good workability can be obtained.

[Brief explanation of drawings]

Figures 1, 2, and 3 show the strain-absorbing box culvert of the example, and Figure 1 is a longitudinal cross-sectional view;
Fig. 2 is a sectional view taken along the line A-A, Fig. 3 is an enlarged sectional view of the connecting portion of the two-part body, Fig. 4 a, b, c, and d are sectional views of modified examples of the connecting member, and Fig. 5 is the actual implementation. Vertical cross-sectional view of the example box culvert connected structure in a state where strain due to uneven ground settlement has been absorbed, No. 6,
FIG. 7 is a side view of a conventional box culvert connection structure and a state in which water-stopping properties have been lost due to uneven settlement. 1... Support pile, 2... Box culvert, 3
...PC steel bar, 4 ... space, 5 ... strain-absorbing box culvert, 6 ... two-part body, 7 ... connection material, 8 ... hollow annular body, 9 ... anchor piece, 10
...Annular strip, 11...Anchor.

Claims (1)

[Claims] 1 In a structure formed by connecting a plurality of ready-made box culverts, a part of the box culvert is replaced with a ready-made strain-absorbing box culvert, and the strain-absorbing box culvert is a two-part body cut along the width direction. are connected by a flexible connecting member, and the flexible connecting member consists of a hollow annular body and annular anchor pieces protruding from both sides of the hollow annular body, and the anchor pieces are embedded in the end faces of the opposing two-part body. A box culvert connection structure characterized by: