JPH0547684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to a method for connecting continuous underground wall panels at joints, and an excavator used therefor.

<<Prior Art>> It is well known that continuous underground walls are used as piles for buildings and underground walls for retaining earth. In this way, when applying horizontal force to the diaphragm wall,
The panels must be fastened together in some way or integrated into the underground structure.

Conventionally, as a method to connect panels to each other,
For example, as shown in Japanese Patent Application Laid-Open No. 56-111718, panels are constructed by pouring concrete into vertical holes that are intermittently excavated, leaving intermediate ground, and the intermediate ground between the constructed panels is There is a method of excavating the joint surface of the panels while excavating the hole, and then pouring concrete into the intermediate vertical hole. In addition, as another construction method, for example, as shown in Japanese Patent Application Laid-Open No. 59-145823, a locking box inserted in the joint surface between the leading panel and the trailing panel is removed and a joint key hole is made between the panels. There is also a method of joining by forming the key hole, cutting the joining surfaces of both panels at the key hole, and then pouring concrete into the key hole.

[Problems to be solved by the invention] In any of these construction methods, the joints between panels are vertically joined, so if a horizontal force is applied to a continuous underground wall, Each panel was prone to relative slippage at its joint surfaces, and was insufficient in strength to bear horizontal forces.

This invention was made in view of the above-mentioned problems, and its purpose is to strengthen the structure of the joints of panels that make up continuous underground walls, and to achieve mechanically efficient and inexpensive construction. Aim to do what you can.

<<Means for Solving the Problems>> In order to achieve the above object, the present invention forms vertical holes between adjacent panels constructed underground,
A method of connecting panels by cutting a plurality of dowel holes intermittently along each vertical direction on the joining surfaces of both panels, and then pouring concrete into the vertical holes, and a method used in this method. The company provides excavators.

<<Example>> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

Figures 1a and 1b to 4a and 4b show a first embodiment of the inventive construction method.

In this example, panels are constructed intermittently underground by placing concrete in vertical holes that are intermittently excavated, leaving an intermediate ground, and the intermediate ground between the constructed panels is This method is applied to a construction method that connects each panel by excavating to expose the joint surface and pouring concrete into the intermediate hole.

First, in Figure 1 a and b, one of the continuous underground walls
Each panel 1 constituting an element has an intermediate ground 2
It was constructed intermittently by pouring concrete into each vertical hole A, which was intermittently excavated with the remaining holes remaining.

The intermediate ground 2 is excavated by a hydrophrase excavator 3 according to the present invention, as shown in FIGS. 2a and 2b.

Hydrophrase excavator 3 has frame 301
A pair of cutter drums 302 protrude from the tip of the frame 301, and a pair of cutter drums 302 protrude from both sides of the frame 301 and abut against the joining surface of the panel 1.
01, and a plurality of position correction arms 303 that support the position correction arm 303. By rotating the cutter drum 302 while lowering the hydrophrase excavator 3, the intermediate ground 2 is excavated and the intermediate vertical hole 4 is formed. Further, at the same time as this excavation work, the cutter drum 302 shallowly cuts the joint surface 1a of each panel.

After the excavator 3 reaches the bottom of the hole and finishes excavating the intermediate vertical hole 4, the excavator 3 is pulled up once and the earth and sand in the intermediate vertical hole 4 is removed, and then
As shown in FIG.
2 in the horizontal direction, semicircular dowel holes 1 are formed intermittently in the vertical direction on the joint surface 1a of each panel 1.
b are formed facing each other.

After cutting the dowel holes 1b, as shown in FIGS. 4a and 4b, concrete is placed in the intermediate vertical hole 4, and a panel part 5 for pouring is formed in the vertical hole.
Dowels 5a corresponding to the shape of the cut dowel holes 1b are intermittently formed in the longitudinal direction on both sides of the panel portion 5.

Figure 5 shows the continuous underground wall 1 constructed as above.
FIG. 2 is a sectional view showing a state in which one side of the tunnel 0 is excavated and an underground structure 11 is assembled thereto. In this way, when the underground structure 11 is assembled, the continuous underground wall 1
In this case, the joint between each panel 1 and 5 is due to the engagement between the dowel and the dowel hole, and the horizontal force is applied to the panel 0, as shown in Figure 4b. In this case, shear stress is applied vertically between the dowel 5a and the dowel hole 1b as shown by the arrow, but the shear strength in this area results in a large horizontal strength between each panel 1 and 5. , the structural functions can be fully satisfied.

Next, FIGS. 6 to 10 show a second embodiment of the construction method of this invention.

In this embodiment, by joining a trailing panel to a preceding panel, a locking box inserted in the joint surface between panels that are constructed continuously is removed, and a joint key hole is formed between the panels. This method is applied to a construction method that involves pouring concrete into the key hole.

First, in FIG. 6, the locking box 21 is inserted in advance into the excavated vertical hole on the splicing side, and concrete is poured into the preceding panel 2.
form 0.

Thereafter, a vertical hole is drilled on the joining side of the preceding panel 20, another locking box 23 is placed so as to butt against the locking box 21 provided on the preceding panel 20, and then concrete is placed in the vertical hole. When the locking boxes 21 and 23 are butted against each other, the leading panel 20 and the trailing panel 22 are integrally joined, as shown in FIG. 7. Next, Locking Box 21,
23, a joint key hole 25 extending in the vertical direction is formed in the joint surface of the leading panel 20 and trailing panel 22, as shown in FIG.

The opposing joint surfaces 20a and 22a of the key hole 25 along the direction of underground wall formation are cut using the hydrophrase excavator 3 described above, and the cutter drum 3b is moved horizontally at appropriate intervals for cutting. As a result, as shown in FIG. 9, a plurality of dowel holes 20b and 22b are intermittently formed in the key hole 25 in the vertical direction.

Thereafter, by pouring concrete into the key hole 25, a pouring panel 26 having dowels 26a in the key hole 25 is formed as shown in FIG.
By repeating the above steps, you will be able to obtain a continuous underground wall panel that has improved horizontal strength due to the dowel effect in addition to the bonding effect of the key joint.

Next, the above-mentioned excavator 2 used in the above construction method
The specific configuration will be explained using FIGS. 11 to 13.

In the figure, the above-mentioned frame 301 is composed of a guide plate section 301a assembled in a truss shape and a widening frame section 301b provided below the guide plate section 301a. The above-mentioned arms 303 are provided on both sides of the upper and lower ends of the guide plate portion 301a. 30 each arm
3 has the function of correcting the position of the frame 301 and supporting part of the load, and protrudes to the left and right using a hydraulic cylinder or the like. Furthermore, the protruding end of each arm 303 has a pad 303a that comes into contact with the panel surface, and by controlling the amount of protrusion of each arm 303, the frame 301 is placed vertically within the vertical hole and at a predetermined distance between the vertical hole and the vertical hole. They are placed with a gap between them.

Further, a height position adjusting cylinder 304 is arranged in the upper part of the guide plate part 301 along the vertical direction, and fine adjustment of the vertical position can be performed by adjusting this cylinder 304.

Brackets 305 are provided on the left and right sides of the bottom plate portion of the width expanding frame 301b, respectively, and are supported via pins 305a so as to be swingable from side to side. In addition, a frame 301 is installed on the lower surface of the center of the bottom plate.
A mud pumping pipe 310 that penetrates vertically through a and 301b protrudes.

The cutter drum 302 described above is rotatably supported under each bracket 305. A hydraulic motor (not shown) is built into the cutter drum 302, and a part of a group of hydraulic hoses 306 arranged vertically through the frames 301a and 301b is connected to the hydraulic motor through the bracket 305.

Further, the tip of the plunger 308 of the angular position adjustment hydraulic cylinder 307 is connected to the swinging end of the bracket 305 via a pin 309a.
The bracket 305 is supported.

The other end of the cylinder 307 is swingably supported by a pin 309b approximately at the center inside the frame 301b, and is driven through the above-mentioned hydraulic hose 306.

Then, as shown on the left side of FIG. 12, when the plunger 308 protrudes, the bracket 305 swings in the direction of the arrow about the pin 305a, and as a result, the outer periphery of the cutter drum 302 is aligned with the frame 301.
It protrudes to the outer periphery of b.

Therefore, each cutter drum 302 is rotationally driven while its left and right protrusion is controlled by remote control from the ground, and uniform cutting on the wall surface and intermittent doweling are performed in accordance with the vertical movement of the frame 301. Can perform hole cutting.

<<Effects of the Invention>> As explained in detail in each of the embodiments above, in the construction method of the present invention, the horizontal yield strength is significantly improved compared to the conventional splicing structure between panels due to the connection of the dowel holes and dowels.

Furthermore, in addition to the conventional construction method, the construction method of the present invention only needs to machine dowel holes on the joining surfaces of the panels by mechanical means using the excavator according to the invention, so construction can be carried out efficiently and at low cost.

[Brief explanation of drawings]

Figures 1a, b to 4a, b show the first embodiment of the invention method, where each figure a is a horizontal cross-sectional view, each figure b is a vertical cross-sectional view, and Figure 5 is an embodiment. Figures 6 to 10 are front cross-sectional views showing the state in which the underground structure is combined with the continuous underground wall panel obtained by the method, and Figures 6 to 10 show the second embodiment of the construction method of this invention. Figure 9 is a horizontal sectional view, Figure 10 is a vertical sectional view,
Figure 1 is a front view showing the specific configuration of the excavator;
The figure is a partial front view of the lower part of the excavator, and FIG. 13 is a side view of the same. 1, 20...preceding panel, 1a, 20a, 22
a... Joint surface, 1b, 20b, 22b... Dowel hole, 2... Intermediate ground, 3... Excavator, 4... Intermediate vertical hole, 5, 26... Connection panel, 5a, 26a
... Dowel, 10 ... Continuous underground wall, 22 ... Trailing panel, 21, 23 ... Locking box, 25
...Key hole, A...Vertical hole, 301...Frame,
302...Cutter drum, 303...Arm for position correction, 305...Bracket, 307...
...Hydraulic cylinder for angle adjustment.

Claims (1)

[Scope of Claims] 1. Vertical holes are formed between adjacent panels built underground, and a plurality of dowel holes are intermittently cut along the vertical direction on the joint surfaces of both panels, and then A method for connecting continuous underground wall panels, characterized by pouring concrete into the vertical holes to connect the panels. 2. Each of the panels is constructed by pouring concrete into vertical holes that are intermittently excavated, leaving an intermediate ground, and each panel is constructed by excavating the intermediate ground between constructed panels. The continuous underground wall according to claim 1, wherein the joint surfaces of the panels are exposed, and then a plurality of dowel holes are intermittently cut along the vertical direction on the joint surfaces of each panel. Panel connection method. 3. Each of the aforementioned panels is constructed continuously by joining the preceding panel to the succeeding panel, and the locking box inserted in the joint surface between the panels is removed and a joint key is inserted between the panels. The continuous fabric according to claim 1, characterized in that a hole is formed, and then a plurality of dowel holes are intermittently cut along the longitudinal direction on the joint surface of both panels in the key hole. Connection method for middle wall panels. 4 A frame that is vertically suspended in a vertical hole formed between panels, and a frame that is placed on both the upper and lower sides of the frame, and that protrudes left and right and comes into contact with the left and right walls of the vertical hole. A position correction arm that adjusts the gap between the two, a pair of brackets that are supported at the bottom end of the frame so that they can swing from side to side, and a pair of brackets that are rotatably supported at the bottom of each bracket.
and a cutter drum whose cutting surface protrudes to both sides of the frame according to the inclination of the bracket, and a cylinder for adjusting the inclination angle of the bracket whose one end is connected to the swinging end of the bracket and the other end is connected to the frame side. Excavator for connecting continuous underground wall panels.