JPH03202510A - Constructing method for underground structure - Google Patents

Abstract

PURPOSE:To shorten a constructing process by connecting pliers to an underground structure, to excavate ground to the second step pliers and to pull the structure downward with a jack, and by removing the upper step pliers, to repeat the constructing process in order in the same manner and to settle the lower section of the underground structure up to a pile head section. CONSTITUTION:To a prefabricated pile 1, anchor pliers 2 are jointed and are driven into up to a required depth, and a required underground structure 7 with an opened bottom plate section io built. After that, with a jack 9, the anchor pliers 2 are connected to, and ground in the underground structure 7 is excavated up to second step unit pliers 2', and with the jack 9, the underground structure 7 is pulled downward and is settled up to an excavated depth together with its tare weight. Then, the upper unit pliers 2' are removed, and in order, this constructing process is repeated, and the lower section of the underground structure 7 is settled up to the head section of the prefabricated pile 1, and with cast-in-place concrete, the head section of the prefabricated pile 1 is integrally formed to be embedded. As a result, a sufficient tensile reaction force can be obtained at any place.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is directed to the construction of an underground structure in which the framework of the underground structure constructed above ground is sunk using the tensile reaction force of piles previously sunk into the ground. It is related to construction methods.

``Prior art and problems to be solved by the invention'' Conventionally, it has been common practice to use sheet piles or H-steel sheet piles to retain earth and construct an underground structure in the excavated area.
In recent years, a method has been adopted in which underground structures constructed above ground are sunk using their own weight while excavating the ground or by applying a tensile reaction force to an earth anchor.

However, in soft ground where support piles are required, the above-mentioned method of sinking using earth anchors has the following problems.

■Since both support piles and earth anchors are installed, the construction period and cost will be longer.

■In soft ground, a fairly long anchor is required to obtain the necessary strength, and basically only economical anchors that are easy to install can be used, making it virtually difficult to use anchors for construction.

■It is difficult to take up space to install the anchor due to its installation along with the support pile.

"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention provides an anchor rod made by removably joining a required number of short unit rods, or a required number of short unit lofts. The lower end of the connected anchor loft was connected to the head of a ready-made pile, and the anchor rod or anchor rod was connected via a jack to the required underground structure, which had been constructed on the ground and had an open bottom plate. After that, while excavating the ground inside the underground structure to the second stage unit or rod,
The jack is activated to pull the underground structure downward, and the tensile force and the underground structure's own weight cause it to sink to the excavation depth. After that, the upper unit jack or rod is removed.
The same process is repeated one after another to sink the lower part of the underground structure to the position of the head of the prefabricated pile, and after completion of the sinking, the bottom floor plate of the underground structure is constructed by burying the head of the prefabricated pile and fixing it with cast-in-place concrete. This paper proposes a method for constructing underground structures.

``Operation'' When an underground structure created on the ground is sunk while excavating its interior, it is sunk while taking a tensile reaction force to the ready-made piles via a series of anchor rods or anchor rods connected to the ready-made piles.

Therefore, there is no need to install an earth anchor, sufficient tensile reaction force can be secured even in a narrow site or on soft ground, and the construction period is shortened.

Anchor rods or anchor rods are short unit rods or unit rods connected together in a detachable manner, and are removed sequentially as the underground structure sinks. Unlike earth anchors, they are not left behind and can be reused.

"Embodiments" Below, embodiments of the present invention shown in the drawings will be described.
Construction of an underground structure The required number of ready-made piles are driven into the ground up to the surface using ordinary pile driving, etc., and the underground part is driven using a Yatco, and the head is used as the bottom floor plate of the underground structure to be constructed later. to be located.

In the first invention shown in FIG. 1, a required number of short unit rods 2 are used as anchor rods 2 to drive ready-made piles l at appropriate positions to provide a tensile reaction force for later sinking underground structures. ' are removably joined with bolts 4 at the joint flanges 3 at their upper and lower ends, and the lower end is joined to the head of a ready-made pile l at a predetermined position.

In the second invention shown in FIG. 2, a long Nari-tko 2 is used, and after driving a ready-made pile 1 at a required position suitable for providing a tensile reaction force for later sinking an underground structure, the Nari-tko 2 is pulled out. The tips of the anchor rods 5, which are made by connecting the required number of short unit rods 5 with joint rods such as threaded joints, were inserted from the ground into the hollow part of the ready-made pile 1, and the anchor rods were injected into the hollow part of the ready-made pile 1. Consolidate it with the ready-made pile l using a consolidating material C such as cement.

After the above construction is completed, the required underground structure 7 with its bottom plate open is built above ground, and a jack 9 such as a center hole jack is mounted on a pedestal 8 projecting horizontally from the lower part of the inner surface.
is installed, and the anchor jack 2 or anchor rod 5 is connected to this jack 9.

For the anchor Yatco 2, a connecting hardware 10' attached to the lower end of a connecting member 10 such as a wire cable is fixed to the upper end joint flange 3 with a bolt or the like, and the upper end of the connecting member 10 is expanded and contracted with a jack 9. Using a connecting means such as connecting to the fastening part 9' of the rod, and connecting the anchor rod 5 to the joint 6 with a joint metal fitting 11 such as a threaded type attached to the lower end of the connecting member 10, the connecting member A connecting means is used, such as connecting the upper end of the jack 9 to the fixing portion 9° of the telescopic rod of the jack 9.

In this state, while excavating the ground within the underground structure 7 to the second stage unit rod 2' or unit rod 5', operate the jack 9 to pull the underground structure 7 downward via the pedestal 8. , the underground structure 7 is lowered to the excavation depth by its tensile force and its own weight.

Then, the first stage unit rod 2° or unit rod 5
, connect the jack 9 to the second unit rod 2' or unit rod 5' in the same way as above, and while excavating in the same way, lower the jack by the tensile force of the jack 9 and the weight of the underground structure 7, and then do the same. Repeat the construction to sink the lower part of the underground structure 7 to the head position of the ready-made pile l.

After the completion of excavation and sinking, the bottom floor plate 1 of the underground structure 7 has the head of the ready-made pile 1 buried and fixed with cast-in-place concrete.
2 is constructed, and the underground structure 7 is supported by ready-made piles l.

On the underground structure 7 thus sunk, an upper ground structure 13 is integrally constructed as required.

In addition, the underground structure 7 and the above-ground structure 13 are constructed so that the upper floor parts are successively assembled in a continuous manner on the lower part of the underground structure 7 that was first constructed above ground while paralleling the sinking and excavation process. You can.

"Effects of the Invention" As described above, according to the present invention, it is possible to sink an underground structure while applying a tensile reaction force to the ready-made pile through the anchor rods or anchor rods connected in series to the ready-made pile. There is no need to install an earth anchor, making it extremely economical to construct, and also ensuring sufficient tensile reaction force even on narrow sites or on soft ground, making it possible to significantly shorten the construction period. .

Anchor Yatco or anchor rod connects short unit Yatco or unit rods in a detachable manner, and is removed sequentially as the underground structure sinks, so it does not become an obstacle to the sinking of the underground structure, and is similar to conventional earth anchors. It can be reused without being left unfilled.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the construction mode of the first invention, FIG. 2 is a perspective view showing the construction mode of the second invention, and FIGS. 3 to 5 are vertical sectional views showing the construction process of the first invention. FIG. 8 is a longitudinal sectional view showing the construction process of the $2 invention. l... Ready-made pile, 2... Yatco for anchor, 2' ・
Unit: Yatco, 3...Joint flange, 4...Bolt, 5
・・Anchor rod, 5° ・・Unit rod, 6・・Joint, 7・・Underground structure, 8・・Pedestal, 9・・Jacket, 9′・Fixing part, 10・・Connection rod, lO′・・Connected hardware, 11・・
Joint hardware, 12... Bottom floor plate, 13... Upper structure, C
... Consolidation material.

Claims (1)

[Claims] 1) The lower end of an anchor rod made by removably joining a required number of short unit rods is joined to the head of a ready-made pile, and the ready-made pile is attached via this anchor rod. After driving to a deep depth and creating a required underground structure with an open bottom plate on the ground in this state, and connecting the above-mentioned anchor Yatco to this underground structure via a jack, the ground within the underground structure is While excavating up to the unit yatko of the tier, the jack is operated to pull the underground structure downward, and the tensile force and the underground structure's own weight cause it to sink to the excavation depth.After that, the upper tier unit yatko is removed and The same process is repeated to sink the lower part of the underground structure to the position of the head of the ready-made pile, and after completion of the installation, the bottom floor plate of the underground structure is constructed by burying the head of the ready-made pile with concrete cast on site. A distinctive construction method for underground structures. 2) After driving a ready-made pile to the required depth using a Yatco, remove the Yatco, and insert the lower end of an anchor rod made by connecting the required number of short unit rods into the hollow part of this ready-made pile from the ground, The solidifying material injected into the hollow part of the prefabricated pile is used to solidify the prefabricated pile, and in this state, a required underground structure with an open bottom plate is constructed on the ground, and a jack is inserted into the underground structure. After connecting the anchor rods, while excavating the ground within the underground structure up to the second unit rod, the jack is operated to pull the underground structure downward, and the tensile force and the weight of the underground structure are used to pull the underground structure downward. After sinking to the excavation depth, remove the upper unit rod and repeat the same process to sink the lower part of the underground structure up to the head of the ready-made pile. A construction method for an underground structure characterized by constructing a bottom floor plate of an underground structure that is buried and integrated.