JPS59177428A - Construction of formwork for making underground structure - Google Patents

Abstract

PURPOSE:To easily make out the fitting position of concrete separator on sheathing wall by fixing the connecting screw metal fitting of the concrete separator beforehand to the steel member of the sheathing wall. CONSTITUTION:Prior to the construction of a sheathing wall 2, a connecting screw metal fittings 5 for concrete separators are beforehand fixed to the steel members 1. The steel members 1 are erectedly set at given intervals to form soil columns 2A, and a sheathing wall 2 is constructed. One end of the concrete separator 4 is connected to the metals 5, and the other end of the concrete separator 4 is connected to a formwork 3 for forming an underground structure to form a space A into which concrete for the underground structure is placed between the sheathing wall 2 and the formwork 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a part of underground framework construction, and is a retaining wall constructed by juxtaposing steel materials at appropriate intervals, for example, using the column row construction method using soil cement or the parent pile horizontal sheet pile construction method. By firmly connecting a concrete separator across the gap between the above-mentioned steel material and the formwork for underground framework production, a concrete placement space for underground framework production is created between the g11 retaining wall and the n11 formwork. Concerning formwork construction method for constructing underground framework.

In the general formwork construction method, as the excavation work is carried out after the construction of the retaining wall, the position where the separator should be fixed to the steel material, which is the main component of the retaining wall, is determined. A work procedure was adopted in which the separator was fixed at the determined position by welding, but this meant that the underground work was relatively narrow from a spatial perspective The above-mentioned separator fixing position indexing is done manually, and a scaffold is required to perform such position indexing on a vertically oriented steel material, which makes the work difficult. There are many steps, inefficiency is high, and the work is dangerous, and
Positioning accuracy is also low. In addition, since welding is carried out horizontally in a place where there is a possibility of water leakage, it is not only disadvantageous in terms of efficiency and safety, but also poses great problems in the strength and quality of the welded part and the accuracy of the separator fixing position. There was a drawback that could easily occur. Special K.

If the retaining wall is constructed using the column-row construction method using soil cement, which has been widely used in recent years, the above-mentioned positioning process must first be done by marking out the soil column, grinding the soil column, or by coring. Since the process of exposing the surface of the steel material is added, work efficiency, labor,
This was accompanied by further disadvantages in terms of welding work.

In view of the above circumstances, an object of the present invention is to propose a formwork construction method for producing an underground framework that can eliminate the above-mentioned conventional drawbacks by adding a work process above ground.

The feature of the formwork construction method for underground framework production according to the present invention, which was taken to achieve the above object, is that the concrete separator screw connection fittings are fixed to the steel material in advance before the construction of the mountain stop wall. After the construction of the wall, the concrete separator is threadedly connected to the metal fittings, and the functions and effects of the present invention having such features are as follows.

(1) It is advisable to use a method to pre-fix the metal fittings for fixing the separator to the steel material before constructing the retaining wall. Since the indexing work can be performed on the ground where it is possible to take a long steel workpiece and in a horizontal position, the indexing work can be performed easily, efficiently, with extremely high precision, and safely.

(2) By welding the steel material horizontally and downward on the ground, where there is no risk of water leakage, the metal fittings can be fixed to the steel material, improving the efficiency of welding work and ensuring safety. The strength, quality, and positional accuracy of the welded part can be stabilized without being too complicated.

As mentioned above (the synergy of 11 and +21 has made it possible to shorten the construction period, reduce construction costs, improve quality, and ensure work safety for the entire construction work), especially in the pillar row method using soil cement as described above. It is particularly effective in applications where retaining walls are constructed.

Examples of the construction method of the present invention will be described in detail below in the order of steps based on the drawings.

[1] Single or double type soi fi/λ-77F
(not shown) Soil pillars (2A) made of a mixture of ground trap earth (aggregate) and cement grout are constructed in rows with adjacent ones partially overlapping each other, and each of these soil pillars is (2 people) Inside the steel material (1) that is the reinforcing core material (generally #
Construct a continuous wall (2) as shown in Figure 1 using the column construction method using soil cement, which uses iH-shaped steel, but other materials such as steel pipes and angle steel may also be used. As shown in Fig. 2, the above-mentioned steel material (1) is laid down on its side on the ground,
Concrete separator screw connection metal fittings consisting of a hollow member with 1 female threaded part (5b) at multiple positions set in advance along the longitudinal direction of the steel material on the outer surface of the center of one of the 7 flange parts+5
1 tl- Fix with downward welding means. At this time, the tip (15a) of the metal fitting (5) is positioned near the outer peripheral surface of the soil column (IA) when the steel material (1) is erected at a predetermined position within the soil column (2A). It is constructed with a protruding length.

(2) Next, each of the metal fittings (
5) Colored cap (6) for protecting the female thread at the tip
As shown in FIGS. 8 and 4, the steel material (1) is erected into the prepared soil column (2 people) while it is still unhardened. At the time of construction, a centering ruler (7) is fixedly installed on the ground surface as shown in Figure 5 in order to improve the accuracy of the construction of buttons, steel materials, and level accuracy.
) is located at a position corresponding to the downward movement of the metal fitting (5).
A cut groove (7a) is formed to allow passage movement.

(3) For the erection of copper material (1), the continuous retaining wall (
Due to underground excavation work after 2) was constructed, the 6th
As clearly shown in the figure, with a part of the soil pillar (9A) removed and the cap (6) completely removed, a concrete separator (4) using a metal rod is attached to the female threaded part (5b) of the metal fitting (5). One end of the male screw part (4a) T-threaded connection. At this time, the length of the separator (4) is adjusted to the female and male threaded portions (5b).

(4a) Adjust with K and secure with nut (8).

On the other hand, as shown in FIG. 7, the other end of the separator (4) is assembled in a state where it is supported by the continuous mountain retaining wall (21K facing each other) TFA thick timber 19). By firmly connecting to the formwork (3) for making the underground framework such as taba foam or metal form, the concrete for making the underground framework is placed between the retaining wall (2) and the assembly formwork (3). Configure the pouring space prisoner.

The formwork construction is completed with the above, but after that, the space (3)
By arranging reinforcing metal as appropriate and pouring concrete, the required underground framework is created. The formwork (3) is removed and repurposed, but the retaining wall (
2) will remain as is.

Another embodiment will be explained below.

(e4) Figure 8 shows that the retaining wall (2) is erected between the H-shaped steel members (1), which are placed underground at appropriate intervals, and the adjacent H-shaped steel members +11 and +11. broken sheet pile (2B)
An example of its application to a structure constructed using the main pile horizontal sheet pile method consisting of
) is attached first by downward welding work on the ground.

(b) In the jgQ diagram, the metal fitting +51 is the male threaded part (5c)
In this case, a bottomed cylindrical member is used as the curing cap (6), and a turn is used to connect the concrete separator (4) and the metal fittings (5). By using buckle αG, separator (4
) are fixedly connected in tension.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the formwork construction method for producing an underground framework according to the present invention, in which Fig. 1 is a schematic plan view of a continuous retaining wall, Fig. 2 is an enlarged perspective view of steel materials, Fig. 3 is a plan view of the main part of the retaining wall, Fig. 4 is an enlarged view of the main part of Fig. 8, Fig. 5 is an enlarged main part of the main part in the state of steel construction, and JGE drawing shows the separator installation procedure. FIG. 7 is a schematic plan view showing a construction plan, FIG. 8 is a schematic plan view showing another embodiment, and FIG. 9 is an enlarged plan view of main parts showing another embodiment. (1)...Steel material, +21-...Top wall, (3)...Formwork, (4)...Separator, (5)... ...Screw connection metal fittings. Figure 7 Figure 8 1
1st 9th ■

Claims (1)

[Claims] ■ The steel materials (1) of the retaining wall (2) constructed with all the steel materials (1) placed side by side at appropriate intervals and the formwork +31 (!: for making underground framework). By fully fixing and connecting the concrete separator (4), p1 is connected to the retaining wall (2).
) and the formwork (3) to form a concrete casting space for producing the underground framework. The concrete separator screw connection fittings (
5) After finishing 8th place and building the mountain stop wall (2),
Attach the IIT period concrete separator (4) to the metal fitting (5).
) is a method of constructing formwork for making underground frameworks, which is characterized by screwing and connecting. ■ The retaining wall (2) is constructed by the pillar row method using soil cement, and the tip (5a) of the metal fitting (5) is connected to the outer peripheral surface of the soil pillar (2A). The formwork construction method for producing an underground framework according to claim 0, wherein the formwork is of a protruding length located nearby. (2) The formwork construction method for producing an underground framework according to claim 0, wherein the retaining wall (2) is constructed by a main pile horizontal sheet pile construction method. (2) The formwork construction method for producing an underground framework according to claim 0, wherein the metal fitting (5) is a hollow member with a female threaded portion (5b). (2) The formwork construction method for producing an underground framework according to claim 0, wherein the metal fitting (5) is a member with a male threaded portion (5C).