JPH0542146Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to a precast concrete box-shaped underdrain material (box culvert).

``Conventional technology'' In conventional precast concrete box-shaped underdrain materials (box culverts), the sealant applied to the uneven joints protruded outward from the connection end face, so the sealant could come into contact with the convex joints during connection work and peel off. There was an easy defect (Utility Model Publication No. 59-41266). The connecting underdrain materials were tightened using long steel rods, and multiple underdrain materials were connected together at once and tightened at both ends, so the force required to compress the connecting end seals or seals of the multiple underdrain materials was A force larger than that required to compress one end face is required, and joint compression is not evenly distributed. As a result, there were defects that required large-scale work such as jacking during construction, and unnecessary pits had to be excavated to create a space for the steel rod insertion in the extension of the final box-shaped underdrain material. In addition, since a tightening recess is opened in the center of the underdrain material, bolts cannot be tightened from the top of the underdrain material, and the length of the box-shaped underdrain material is relatively short, making the connection work complicated. It was hot (Special Publication No. 52-17567,
Special Publication No. 55-2498, Jitko No. 53-48513, Jitsukaisho
61-94104).

``Problems to be solved by the invention'' This invention allows the length of the box-shaped underdrain material to be made longer, and there is no risk of peeling of the connection end sealing material during construction, and large-scale equipment is not required for tightening the end connections. Not only can the sealing material of each connection part be easily and evenly tightened from the top (outer surface) of the underdrain material, but also the number of bolt insertion pits in the extension of the box-shaped underdrain material at the final end of the connection can be minimized or eliminated. The purpose is to

``Means for Solving the Problems'' In order to achieve the above purpose, this proposal forms uneven joints on both connecting end surfaces of concrete box-shaped underdrain materials, forms reinforcing surfaces at the four internal corners, and forms a reinforced surface on the inner surface of the concave joints. a flexible sealing material is provided, bolt insertion holes for connecting both end faces are bored in the thick part of the underdrain material in the direction of the underdrain, and both ends of the insertion holes are opened at both end faces of the connection;
In a precast box-shaped underdrain material formed with a recess for tightening a bolt that communicates with the insertion hole, the flexible sealing material is affixed to the inner surface of the recess, does not protrude from the connection end surface, and the bolt An insertion hole is bored in the slab interposed between the reinforcing surfaces at both upper corners, and two tightening recesses are opened on the upper surface of the slab above the insertion hole, and both ends of the bolt are connected to the end surface. The box-shaped underdrain material is exposed in the recesses provided on both sides of the underdrain material, and the length of the bolt is smaller than the length of the underdrain material in the underdrain direction.

"Function" Therefore, when the end surfaces 1 of the precast box-shaped underdrain material 9 are brought into contact and connected, the flexible sealing material 5
is located inside the concave joint 2 and does not protrude from the end face 1, so the opposite end face 1 aligns without the sealing material 5 touching the opposite end face 1, and the convex joint 3 and the concave joint 2 are engaged male-femally, and both joints 2, 3 to seal the joint by compression deformation. Since the bolt 6 is inserted into the end face connection insertion holes 7, 7 before the opposing end faces 1, 1 are aligned, both ends of the bolt 6 are exposed in the tightening recesses 8, 8 on both sides of the connection part, respectively. , washers 11 on both exposed parts
The bolt 6 is tightened by a method such as tightening the nut 12 with a small jack or the like and rotating the nut 12 in this state, compressing the sealing material 5 and sealing the opposite end surface 1. Contact and connect the same underdrain material (box culvert) 9. This bolt 6
are inserted into the insertion holes 7, 7 drilled in the upper slab 10 interposed between both corner reinforcing surfaces 4, 4 at least in the upper part of the underdrain material 9, and are inserted into the recesses 8, 8.
The bolt 6 is open on the top surface of the underdrain material 9.
The both ends tightening work can be performed on the upper surface of the underdrain material 9. In addition, with the final underdrain material 9 connected in this way, it is necessary to excavate an extension pit larger than the buried space of the final underdrain material 9 by inserting bolts 6 into the insertion holes 7 and 14 as shown in FIG. do not have.

"Example" Box-shaped underdrain material 9 made of precast concrete
A thick reinforcement part 4' is formed at the four inner corners of the 4', an inclined reinforcement surface 4 is formed on the reinforcement part 4', a concave joint 2 is formed on one connecting end face 1, and a concave joint 2 is formed on the other connecting end face 1. A convex joint 3 is formed on the surface, and the opposing end surfaces 1, 1 are engaged with each other by concave and convex joints 2, 3. A flexible sealing material 5 is attached to the inner surface of this concave joint 2 with adhesive so that the sealing material 5 does not protrude outside the end surface 1. It is preferable to form it by using a flexible adhesive sandwiched in the shape of a sandwich. Upper reinforcing surfaces 4, 4 of the above-mentioned underdrain material 9
Two insertion holes 7 for end face connection bolts 6 are bored in the direction of the underdrain in the slab 10 interposed in the middle of 2 are formed on the same insertion hole 7. Insertion holes 7 are also drilled in the reinforcing portions 4', 4' at both lower corners in the direction of the underdrain, and bolts 6 communicating with the insertion holes 7 are also tightened on the upper surfaces of the reinforcing portions 4', 4'. Two recesses 8 are formed on the insertion hole 7, and both ends of these four insertion holes 7 are opened to the connection end surfaces 1, 1.
As shown in FIG. 2, the bolt 6 is inserted into the insertion hole 7, 7 between the opposing connecting end surfaces 1, 1, and both ends thereof are exposed in the recesses 8, 8 on both sides of the opposing connecting end surfaces 1, 1. The length of the recess 8,
8 through the washer 11 and the tightening nut 12
are screwed together from the top surface of the underdrain material 9 (Fig. 2). Further, bolts 6 at both lower corners are screwed together with nuts 12 in recesses 8 opened in reinforcing surfaces 4, 4 inside the underdrain material 9. When screwing together, tighten the nut 12 with a power wrench to tension the bolt 6, or pull it with a small jack to maintain tension, then rotate the nut 12 to remove the jack and maintain the tension. Therefore, the opposing end surfaces 1 and 1 are brought into contact and the sealing material 5 is compressed between the uneven joints 2 and 3 to form the joints 2 and 3.
can be sealed. Note that the reference numeral 14 in the figure is a central communication hole of each insertion hole 7.

``Effects of the invention'' Since the present invention is constructed as described above, the shape of the flexible sealing material is simplified when connecting the box-shaped underdrain material, and by simply pasting it inside the recessed joint 2, there is no risk of it peeling off or falling off. Moreover, the underdrain materials 9, 9 can be easily tightened and connected from the top surface of the underdrain materials 9 with a simple device without requiring a large tension device to compress the sealing material, and not only can the underdrain materials 9, 9 be evenly tightened and connected. There is no need to drill unnecessary bits for inserting bolts into the extension of the box-shaped underdrain material connected to the final end of the same underdrain material, and the length of the box-shaped underdrain material can be made longer, so that the connection construction part can be It has the advantage of shortening the construction period.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the connected state of the box-shaped underdrain material of the present invention, Fig. 2 is an enlarged vertical cross-sectional view taken along the line A-A in Fig. 1, Fig. 3 is a longitudinal cross-sectional view of the state before bolt insertion, FIG. 4 is a front view of the underdrain material, FIG. 5 is an enlarged longitudinal sectional view of the joint connection state, and FIG. 6 is a perspective view of the underdrain material. 1... Connection both end faces, 2, 3... Uneven joint, 4...
... Reinforcement surface, 5 ... Flexible sealing material, 6 ... Bolt for connecting both end faces, 7 ... Bolt insertion hole, 8 ... Recess for tightening, 9 ... Concrete box-shaped underdrain material.

Claims (1)

[Scope of utility model registration request] Concave and convex joints are formed on both connecting end surfaces of the concrete box-shaped underdrain material, reinforcing surfaces are formed at the four internal corners, flexible sealing material is provided on the inner surface of the concave joint, and bolt insertion holes for connecting both end surfaces are formed on the underdrain material. A hole is drilled in the thick part in the direction of the underdrain, and both ends of the insertion hole are opened at both end faces of the connection,
In a precast box-shaped underdrain material formed with a recess for tightening a bolt that communicates with the insertion hole, the flexible sealing material is affixed to the inner surface of the recess, does not protrude from the connection end surface, and the bolt An insertion hole is bored in the slab interposed between the upper corner reinforcing surfaces, two tightening recesses are opened on the upper surface of the slab above the insertion hole, and both ends of the bolt are connected to the end surface. The box-shaped underdrain material is exposed in the recessed portions provided on both sides of the box-shaped underdrain material, and the length of the bolt is smaller than the length of the underdrain material in the underdrain direction.