JPS58150631A - Construction work of underground structure - Google Patents

Abstract

PURPOSE:To raise the accuracy and efficiency of construction work by a method in which a structure oonsisting of pillars, wale and beams is formed in a wall- shaped trench excavated underground so that it can share the pressure of surround ground and water pressure and also the numbers of temporary materials are reduced. CONSTITUTION:In a wall-shaped trench 1 excavated underground and subjected to a mud-water treatment in advance, pillars 2 are fixed at given intervals by a temporary fitting tool 24, a proper number of beams 4 are laid, a strength wall 3 is inserted and joined through a T-shaped guide rail and coupler 12 and a T-shaped tool 13, the ground inside the structure is excavated to a given flooring face 8, a foundation slab (not illustrated) is set and joined with a foundation beam 4', and a floor slab (not illustrated) is laid and connected with the beam 4. Thus, the structure can be constructed with a high accuracy and also can withstand surround soil pressure and water pressure, and the numbers of temporary structures can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing an underground structure by forming pillar materials, beam materials, load-bearing wall materials, floor materials, etc. using precast concrete members.

Conventional construction methods for underground structures require the construction of many temporary structures, such as pile shoring to bear the earth pressure and water pressure of the surrounding ground, and a platform for transporting excavated soil. In addition, with the caisson construction method, the excavation work was affected by the ground condition, which caused problems in terms of construction efficiency and required a large amount of construction cost and construction time.Furthermore, when joining precast concrete members, workers were required to work in the excavation space. Since the joining work is performed near the joint or in muddy water, there are problems with muddy water adhering to the joint or getting mixed into the concrete or mortar being poured.

The present invention solves the above-mentioned problems and provides a method for constructing an underground structure that improves the structural precision and workability of the main structure.

Next, embodiments of the present invention will be described based on the drawings. FIGS. 1 and 2 show the construction method of this invention. In the figure, a temporary fixing jig 24 is used to fix the pillars 2 at predetermined intervals in the wall groove 1 that has been excavated in advance and treated with muddy water.
The appropriate number of beams 4 are passed between the pillars 2 and joined, and the load-bearing wall materials 3 are inserted into the outer periphery of the structure, and the load-bearing wall materials 3 and the load-bearing wall materials 3 and the beam materials 4 are After joining and constructing a frame structure having continuous walls, a muddy water solidification treatment is performed in the wall-shaped groove 1 to form a water-stop wall made of the muddy water solidified body 5 having a predetermined strength, and from the surrounding ground 6. The earth and sand 7 inside the frame structure, which can withstand the soil and water pressure, is excavated to a predetermined floor surface 8. Next, a foundation slab material 9 is installed on the surface 8 and joined to the foundation beam material 47, and the floor material]0 is framed and joined to the beam material 4.

In this invention, the pillars 2 are used as guide rails when the beams 4 are bridged, and the beams 4 are mainly used as the guide rails when the load-bearing wall materials 3 are constructed. Figure 3 shows
This is a horizontal cross-sectional view of the joint between the column material 2, the beam material 4, and the load-bearing wall material 3. The right half of the figure shows the state during assembly, and the left half shows the state filled with filler after assembly. It is. In the figure, an appropriate number of T-shaped guide rail joints 12 are fixed at predetermined positions on the joint surfaces of the pillars 2, beams 4, and load-bearing wall materials 3, and the same number of T-shaped grooves 13 are installed at corresponding positions. At the same time, the T-shaped guide rail joint material 12 is connected to the anchor bar 14, the T-shaped groove 13 is connected to the pressure feed hose 15, and the joint part 11 of the joint part of each member is connected to the T-shaped groove 13.
After the beam material 4 and the load-bearing wall material 3 are lowered to a predetermined depth, cleaning water is pumped through the pressure feed boss 15 to clean each joint and then the material is pressure-fed. Filling material may be filled from the hose 15.

In addition, although Figures 1 and 2 show the construction method when using earthworks as a solid foundation, if a pile foundation is used, it is preferable to install piles at the bottom of the columns or beams in terms of structural design. Difficult to join. Figures 4 and 5 show a method of joining foundation piles and foundation slab materials. In the figure, the foundation pile 17 is located near the intersection of the pillar material 2 and the foundation beam material 4+, or near the side of the foundation beam material 4, and the foundation pile 1
7, the foundation pile 17 and the foundation slab material 9+ are joined using a foundation slab material 9' with a reinforcing steel pipe 23 fixed around the foundation hole 18. At this time, by arranging pile reinforcements 21 and base reinforcements 22 on the pile head 20 of the foundation pile 17 and the foundation slab material 9+, respectively, and filling the joint with filler material, it is possible to securely anchor the foundation pile 17 to the ground 6. .

As mentioned above, the present invention provides the following effects compared to conventional construction methods.

(1) Since a wall-like trench is excavated and the main structure excluding the foundation slab material and flooring material is erected in advance, temporary structures such as heap shoring, temporary structures for the platform for entry, and temporary materials for assembling precast concrete members, etc. can be reduced to 1], reducing construction costs and construction period.

(2) After constructing columns, load-bearing walls, and beams in the wall-shaped trench to form a frame structure and burdening the frame structure with the earthworks and water pressure of the surrounding ground, excavate the internal earth and sand. Construction safety can be measured.

(3) By providing a T-shaped joint member that also serves as a guide rail and a T-shaped groove at the joints of the columns and beams, and engaging them, various stresses occur at the joints of the columns and beams. can be transmitted, and members can be joined in the soil by remote control, making it possible to build with high precision.

(4) When joining pillars and beams, cleansing water is pumped to each joint surface,
By pumping the filler after cleaning, it is possible to minimize the amount of slime and muddy water mixed in, and an economical structural design can be achieved without the need to increase the cross-sectional area or amount of reinforcing bars.

[Brief explanation of drawings]

Figures 1 and 2 are oblique cross-sectional views of the construction method of the present invention, and Figure 3 is a horizontal cross-sectional view of the joints of columns, beams, and load-bearing wall materials, and the right half of the figure. Figure 4 is a perspective sectional view of the pile foundation construction method, and Figure 5 is an enlarged view of the joint in Figure 4. . 1: Wall groove 2: Column material 3: Bearing wall material 4.4: Beam material and foundation beam material 5: Solidified mud 6: Ground 7: Excavation earth and sand 8: Flooring is surface 919: Foundation slab material and foundation pile Connection foundation slab material IO = Floor material 11: Joint portion 12: T-shaped guide rail joint material 13: T-shaped groove 14: Anchor bar 15: Pressure feed hose 16: Elastic gasket 17: Foundation pile 18: Foundation hole 20: Pile head 21: Pile reinforcement 22: Base reinforcement 23: Reinforcement steel pipe 24: Temporary fixing jig No. 1 Fig. 2 Fig. 7 Fig. 4 Fig. 5

Claims (1)

[Claims] (1) Pillars are fixed at predetermined intervals in a wall groove excavated underground, and a suitable number of load-bearing wall materials and beam materials, including foundation beam materials, are passed between the pillars to form a continuous frame. A frame structure is formed by constructing columns, load-bearing walls, and beams in a wall groove, and a polygonal column-shaped interior surrounded by the columns and load-bearing walls or columns and beams is predetermined. An underground structure construction method (2, patented An appropriate number of T-shaped guide rails are also used at predetermined positions of the joint surfaces of the beam and the column and the joint of the beam and the load-bearing wall, respectively, as described in claim 1. The joint material is provided in the axial direction, and the same number of T-shaped grooves are provided corresponding to the joint surfaces of the beam material and the load-bearing wall material, and the T-shaped guide rail double-use joint material is engaged with the joint material, and the beam material and the load-bearing wall material are fixed to the specified position. A construction method for an underground structure characterized by forming a joint structure in which the joint structure is joined by washing and filling with a filler material after hanging in a position (3) The pillar material according to claims 1 and 2 and A foundation slab with a foundation hole around which a reinforcing steel pipe is fixed, into which the pile head of a foundation pile with a predetermined number of pile reinforcements can be inserted at the intersection with the foundation beam material or at the side surface of the foundation beam material. A construction method for underground structures characterized by placing base reinforcement inside the foundation hole and filling it with filler after installing the material.