JPH0461936B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a top-shaped block for ground stabilization in which a conical body is provided at the lower part of a flat top board, and a cylindrical shaft leg is provided at the center of the lower part of the body. , concerning the installation method.

(Prior art) A top-shaped block balances the weight of the block itself, the vertical load it receives, and the total force of the ground reaction force and frictional resistance generated in the body and pivot legs, so that the block can be leveled without uneven settlement. It exerts the bearing capacity of the soil, and is used as a basic component in various ground stabilization and foundation reinforcement construction methods.

(Problems to be Solved by the Invention) Conventional block-shaped blocks are manufactured using ordinary Cenmet concrete materials, and no particular consideration is given to increasing the water permeability of the blocks themselves. Therefore, if the pore water in the soft ground is pushed out to the upper part of the foundation ground, the block group installed above the foundation ground will prevent the pore water from penetrating further upwards and escaping or evaporating to the outside. The interstitial water only escapes through the gravel layer between the block blocks.

Therefore, an object of the present invention is to drain water from the soft ground layer up to a certain depth from the installation surface of the block block not only from the filler gravel layer but also from the block block itself, thereby reducing the water required in the ground layer. By quickly exerting its supporting capacity, the subsidence can be controlled at a certain level,
The object of the present invention is to provide a top-shaped block that stabilizes the ground at an early stage and a method for laying the same.

(Means for Solving the Problems) The following will be explained using the reference numerals in the attached drawings.
A conical body 11 is provided at the lower part of a flat top plate 12, a cylindrical shaft leg 13 is provided at the center of the lower part of the body 11, and the whole has high water permeability.

In addition, in the laying method of the present invention, a plurality of water permeable block-shaped blocks 10, 10... are arranged in parallel, and the lower part of each block-shaped block 10, 10... is interconnected with a raft mat 30. 10, 10... are connected to each other by a raft union 40, and the pivot legs 13, 13... of each top-shaped block 10, 10... are connected to each other by a raft union 40.
is held perpendicular to the foundation ground 1, and a permeable gravel layer 2 is packed and formed between each piece-shaped block 10, 10, . . .

(Example) The block-shaped block of the present invention is generally produced by pouring cement concrete or resin concrete mixed with a foaming agent or a water permeability agent into a block-shaped formwork.
It is manufactured by curing and hardening, and because of its closed-cell or open-cell foam structure and porous structure, it has sufficiently high water permeability compared to ordinary concrete blocks. be.

In the illustrated embodiment, a connecting reinforcing bar 15 is inserted into the formwork so as to pass through the center of the body part and the shaft leg part when forming a top-shaped block, and the bent upper end 15a of the connecting reinforcing bar 15 forms the top-shaped block. It protrudes from the flat top plate 12 of. The upper end portion 15a is used as a hanging portion when the top-shaped block 10 is transported.

When laying the frame block, a raft mat 30 is laid on the top surface of the excavated foundation ground 1. This raft mat 30 consists of a flat top plate 12 of a top-shaped block.
A cross-shaped reinforcing bar made by welding at right angles a plurality of vertical reinforcing bars 31 arranged in parallel at intervals equal to the diameter of the flat top plate 12 and a plurality of horizontal reinforcing bars 32 arranged in parallel at intervals equal to the diameter of the flat top plate 12. It is an assembly, and a triangular section 34 is provided by welding diagonal reinforcing bars 33 to the intersection of the vertical reinforcing bars 31 and the horizontal reinforcing bars 32.

Insert the lower end of the shaft leg 13 into a vertical hole in the foundation ground 1 made with a rod-shaped rammer or the like through the section 34, or directly stick the shaft leg 13 into the foundation ground 1 without drilling such a vertical hole, The pivot leg 13 is press-fitted into the foundation ground 1 by human or mechanical power. When the ground is highly soft or a large load is applied, crushed stone is filled up to the tip of the lower conical portion 14.

The frame-shaped block group, which is constructed by inserting the pivot legs 13 into the sections 34 of the raft mat 30 and sequentially laying them on the foundation ground 1, keeps each flat top board 12 as horizontal as possible,
A raft union 40 is placed above it. This raft union 40 has a plurality of vertical reinforcing bars 41 arranged in parallel at intervals equal to the diameter of the flat upper surface board 12 and a plurality of horizontal reinforcing bars 42 arranged in parallel at intervals equal to the diameter of the flat upper surface board 12. This is a cross-shaped reinforcing bar assembly made by welding at right angles.

The raft union 40 is fixed by binding or welding to the upper end portion 15a of the connecting reinforcing bar protruding from the center of the flat top plate 12 at the intersection of the vertical reinforcing bar 4 and the horizontal reinforcing bar 42. The gap between the bodies 11, 11 of the group of top-shaped blocks planted on the foundation ground surface 1, and the gap between the flat top plates 12, 12 are filled with crushed stone, and the space is filled with crushed stone, which is then subjected to mechanical force such as a manual push rod or rod vibrator. The gravel is thus sufficiently compacted, and then rolled with a compactor or the like to form a dense packed gravel layer 2.

As described above, a foundation structure is constructed by laying block-shaped blocks, and a gravel layer 2 of a certain thickness is provided as necessary on the top surface of the block-shaped blocks 10, 10..., and foundation concrete 3 for building construction is poured. be done. If there is not much time between the construction of the foundation structure using block blocks and the construction of the building, it is possible that water is being drained from the soft ground, so the foundation concrete 3 may be connected to the outside. By providing the communication path, it is possible to prevent water from remaining in the block block 10 and the interfill gravel layer 2 in a saturated state, and to more actively remove and evaporate water.

In this embodiment, the vertical walls 20, 20 are constructed on the foundation ground 1 prior to the installation of the top-shaped blocks, and the outermost top-shaped block among the group of top-shaped blocks arranged between the vertical walls 20, 20 is constructed. 10 desirably contacts the vertical wall 20 directly or via a rigid body. The horizontal component of the ground reaction force in the outermost block is opposed by the vertical wall 20 provided at the outer periphery of the group of block blocks, while the ground reaction force between the block blocks other than the outermost block is Since the horizontal components of the reaction forces cancel each other out, each top-shaped block 10, 10, . . . is maintained in its initial upright state without moving in the horizontal direction.

The vertical wall 20 is made of metal sheet piles, concrete sheet piles, plate-shaped members, pile members, etc. on the foundation ground 1.
It can be constructed by pouring concrete into a trench, but it can also be constructed of a reinforced concrete wall made by pouring concrete into an excavated trench.

(Effects of the Invention) As described above, since the block-shaped block 10 of the present invention has high water permeability as a whole, it can be effectively used as a passage for pore water in soft ground to penetrate to the upper part. By promoting water drainage from the soft ground layer up to a certain depth from the top-shaped block installation surface, the required bearing capacity is quickly exerted in the ground layer, suppressing subsidence at a certain level, and improving the ground. It can be stabilized early.

In the laying method of the present invention, the plurality of block-shaped blocks 10, 10... arranged in parallel are connected to the raft union 40.
Since the upper and lower parts are mutually restrained by the raft mat 30, the pivot leg 13 of each top-shaped block is always maintained in a vertical state, and a part of the top-shaped block group does not tilt locally. . In this way, since the body surfaces 11 of each top-shaped block are precisely arranged symmetrically with respect to the vertical line, each body surface 11 converts the vertical component of the ground reaction force into buoyancy to prevent subsidence, and generates a horizontal component. It is possible to make the most of the anti-sinking properties of the top-shaped block, which cancel each other out.

Moreover, since each top-shaped block 10, 10... is stably held vertically, the top-shaped blocks 10, 10...
...The filling and compaction work of filling the gravel layer 2 into the gap can be efficiently and reliably performed by using mechanical force such as a rod vibrator, and the pore water can permeate through the filler layer 2 together with the block-shaped blocks 10. It can be effectively used as a passageway for discharging to the outside.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a top-shaped block according to an embodiment of the present invention, FIG. 2 is a vertical sectional view showing an example of the ground on which the top-shaped block is laid, and FIG. 3 is a diagram showing the top-shaped block and a raft mat. 4 is a perspective view of the raft union, and FIG. 4 is a plan view showing the state in which the block-shaped blocks are laid. 1... Foundation ground, 2... Interfill gravel layer, 3... Foundation concrete layer, 10... Top-shaped block, 11
... Conical body, 12 ... Flat top plate, 13 ...
Cylindrical shaft leg, 14... Lower end conical part, 15... Connection reinforcing bar, 20... Vertical wall, 30... Raft mat, 31
... Vertical reinforcing bar, 32... Horizontal reinforcing bar, 33... Diagonal reinforcing bar, 34... Pivot leg insertion compartment, 40... Raft union, 41... Vertical reinforcing bar, 42... Horizontal reinforcing bar.

Claims (1)

[Claims] 1. A top-shaped ground stabilizing piece having high water permeability as a whole, including a conical body 11 provided at the lower part of the flat top plate 12 and a cylindrical shaft leg 13 provided at the center of the lower part of the body 11. Block. 2. A conical body 11 is provided at the lower part of the flat top board 12, and a plurality of water-permeable top-shaped blocks 10, 10... each having a cylindrical shaft leg 13 provided at the center of the lower part of the body 11 are arranged in parallel, and each piece type The lower parts of the blocks 10, 10... are mutually connected by a raft mat 30, and the upper parts of the respective top-shaped blocks 10, 10... are mutually connected by a raft union 40. 13, 13... are held perpendicular to the foundation ground 1, and a permeable gravel layer 2 is packed and formed between each block-shaped block 10, 10....