JPH0244963B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a joint structure for concrete structures.

When constructing a manhole, it is usually constructed by stacking a plurality of concrete blocks such as frame blocks, straight wall blocks, and slant wall blocks.

The present invention relates to a joint structure for such a concrete construction.

b. Prior art Generally, this type of manhole is constructed by placing a chestnut foundation or the like at the bottom of excavated ground, laying a bottom slab block on top of this foundation, and placing a wall block, straight wall block, etc. on top of this bottom slab block. It is constructed by sequentially stacking a plurality of concrete blocks such as sloping wall blocks, and is then used by backfilling the periphery of the blocks with soil.

However, recent backfilling work is carried out using heavy machinery such as bulldozers, so uneven earth pressure tends to act on the stacked blocks during the work. Therefore, unless the blocks are firmly joined to each other, there is a problem that the blocks may become misaligned during backfilling work.

Therefore, we developed a construction method as shown in Figures 5 and 6. This is done by embedding a connector 102 with a female thread on the inner peripheral surface in the upper surface of the lower block 100 of the concrete blocks 100 and 101 that are stacked on top of each other, and on the other hand, the lower surface of the upper block 101 has an open side. A box-shaped connecting fitting 103 is buried therein. This connecting fitting 10
A hole 103a is provided in the bottom surface of 3.

And concrete blocks 100, 101
When joining each other, the lower end of a bolt 104 is screwed into the connector 102, and the upper blocks 101 are stacked so that the head of the bolt 104 matches the hole 103a. Next, the two-pronged washer 105 is fitted onto the head of the bolt 104 from inside the connecting fitting 103, and the bolt 104 is tightened. Finally, the inside of the connecting fitting 103 is filled with mortar for finishing.

c Problems to be Solved by the Invention However, according to the prior art as described above, the bolt 104 must be tightened within the connecting fitting 103, making the tightening work difficult. Furthermore, the connection fittings 103 must be filled with mortar, and furthermore, there is a problem in that the end surfaces of the fittings are exposed.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and provide a joint structure for concrete structures that allows easy joining work and improves surface finish.

d Means for Solving the Problems In order to solve the above problems, the present invention provides a connecting member with a part protruding from the lower surface of the structure located on the upper side, and the above-mentioned connecting member is provided on the upper surface of the structure located on the lower side. A recess corresponding to the protruding part of the connecting member is formed, and the protruding part of the connecting member is fixed by a hardening material filled in the recess.

e Effect In the present invention, one end of the connecting member is connected to the connector of the structure located above with a screw or the like,
On the other hand, a hardening material such as resin or mortar is filled in the recess of the lower structure, and the other end of the connecting member is inserted into the recess to stack the upper structure. As a result, the upper structure and the lower structure are joined together as the hardening material hardens.

f Examples The present invention will be described in detail below with reference to illustrated examples.

Figures 1 to 3 show the joint structure of the concrete structure of the present invention, Figure 1 is a cross-sectional view showing the upper structure and lower structure separated, and Figure 2 shows the attachment of bolts as connecting members. FIG. 3 is a sectional view showing the bonded state. FIG. 4 is a sectional view showing the state in which the present invention is applied to a manhole.

The manhole 1 shown in FIG. 4 is constructed by sequentially stacking a plurality of concrete blocks, namely, a bottom block 2, a frame block 3, a straight wall block 4, and an inclined wall block 5. The bottom plate block 2 is a disc-shaped one laid on a chestnut stone foundation 6 through a mortar layer 7, and has an annular joint surface 2a on the outer peripheral edge of its upper surface. A positioning protrusion 2b is provided in an annular manner on the outer peripheral edge of the holder. The body block 3 is a cylindrical body whose lower end is fitted inside the protrusion 2b of the bottom block 2 and whose joint surface 3a on the lower end side is joined to the joint surface 2a of the bottom block 2. ,
A pipe 8 constituting a sewerage system is connected to a portion of the surrounding wall. An invert 11 having an inverted arch-shaped groove 9 continuous with the tube 8 is installed at the bottom of the rod block 3. The straight wall block 4 has a cylindrical shape and is laid on the body block 3 with its lower end joint surface 4a abutted against the upper end joint surface 3b of the body block 3. The inclined wall block 5 has a joint surface 5 on its lower end side.
It is laid on the straight wall block 4 by abutting the joint surface 4b on the upper end side of the straight wall block 4, and is formed into a substantially truncated cone-shaped cylindrical body with the upper end eccentric. A receiving frame 13 for holding the lid 12 in an openable/closable manner is placed on the joint surface 5b on the upper end side of the slanted wall block 5 via a concrete adjustment ring 14 and a plurality of adjustment rubbers 15, and the receiving frame bolts It is fixed using 16.

The connection structure between the blocks 2, 3, 4, and 5 will be explained with reference to FIGS. is buried there. This connector 17 is formed into a cylindrical shape, and has a female screw 17a cut into its inner peripheral surface.

On the other hand, on the lower surface of block 3 located on the lower side,
A recess 18 is provided at a position corresponding to the connector 17, and this recess 18 is filled with a hardening material 19 such as resin or mortar. In this recess 18, the other end of a bolt 20, one end of which is screwed into the connector 17, is fixed with a hardening material 19.

Reference numeral 21 denotes a sealing material such as butyl rubber disposed on a stepped portion 22 formed on the outer peripheral side of the recessed portion 18 .

Next, the joining structure with the above configuration will be explained in accordance with the joining order. A bolt 20 serving as a connecting member is screwed into the connector 17 of the block 4 located on the upper side. Then, the recess 18 of the block 3 located on the lower side is filled with a curing agent 19, and this recess 18
Insert the bolt 20 inside and place the upper block 4. The bolt 20 is fixed by hardening of the hardening material 19, and both the upper and lower blocks 3, 4 are joined. Finally, fill the joint 4a of block 4 with meltal to complete the process.

It goes without saying that any material other than the bolt 20 may be used as the connection member as long as it can be easily installed with the connector 17. Furthermore, the connector 17 can be omitted by embedding the connecting member in the upper structure in advance.

g. Effects of the Invention As described above, according to the joint structure of concrete structures according to the present invention, a connector is buried in the lower surface of the structure located on the upper side, and a recess corresponding to the connector is formed on the upper surface of the structure located on the lower side. a connecting member having an upper end connected to the connector and a lower end disposed within the recess, the lower end of the connecting member being fixed by a hardening material filled in the recess; This makes the joining work easier. Since the bonding members and the like are not exposed on the surface, it is possible to prevent the occurrence of rust.
Since there is no risk that the mortar in the recesses will flow out, it is particularly effective for products with inclined walls.

[Brief explanation of drawings]

1 to 3 are cross-sectional views showing one embodiment of a joint structure for a concrete structure according to the present invention,
FIG. 4 is a perspective view showing the implementation side applied to a manhole, and FIGS. 5 and 6 are sectional views showing the joint structure of a conventional concrete structure. 2, 3, 4, 5... concrete block, 1
7... Connector, 18... Recess, 19... Hardening material, 20... Bolt.

Claims (1)

[Claims] 1. In a joint structure of concrete structures constructed by stacking one above the other, a connecting member is provided with a part protruding from the lower surface of the structure located on the upper side, and the above-mentioned connecting member is provided on the upper surface of the structure located on the lower side. 1. A joining structure for a concrete structure, characterized in that a recess corresponding to a protruding part of a connecting member is formed, and the protruding part of the connecting member is fixed by a hardening material filled in the recess. 2. The joint structure for concrete structures according to claim 1, characterized in that a connector is embedded in the lower surface of the structure located above, and the connection member is provided via the connector.