JPH0678611B2 - Method for inserting reinforcing bar, method for forming hardened layer with built-in reinforcing bar using the method, and reinforcing bar - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a method for inserting a reinforcing material to be inserted into the ground for the purpose of improving soft ground, supporting shrouds in the foundations of tunnels and structures, and earth retaining. The present invention relates to a method for constructing a hardened ground layer having a built-in reinforcement and a reinforcement reinforcement.

[Prior Art] Conventionally, this type of reinforcing bar material is inserted into the ground by injecting a hardening liquid, etc., with the bar material provided with the skeletons extending radially around the solid shaft rod at appropriate intervals. It was based on the method of inserting by pushing or hitting the softened ground.

[Problems to be Solved by the Invention] In the conventional method of inserting a reinforcing bar, is it possible to soften the target ground to a liquid-like state by interfering with the supporting ribs provided in the bar that radially open the legs? Since it could only be inserted in a very short distance, its use was extremely limited. On the other hand, the hardening layer construction method by injecting the ground hardening material has rapidly developed, and the water stop, which was the main purpose in the past, becomes secondary, and as the purpose shifts to foundation building and lining construction, The hardened layer due to injection alone remained strong dissatisfaction, and the reinforcement by the insertion of the braces suddenly attracted attention.

[Means for Solving Problems] In order to solve the above problems, the present invention provides a very difficult-to-handle muscular material in which a supporting bone radially extending around a shaft is provided at appropriate intervals in a casing. By accommodating into the target ground, the width of the insertion means to the target ground can be widened and a long muscular member can be inserted. Also,
Depending on the condition of the ground into which the reinforcing material is inserted, by making the shaft rod hollow and providing a jet outlet on the side wall, it is possible to fill the filling material in the voids generated between the reinforcing material and the insertion ground, thus ensuring the reinforcement effect of the reinforcing material. It is the one.

[Operation] Since the muscle material is forcibly accommodated in the casing having a diameter smaller than the diameter of the open leg of the skeleton that radially spreads, the ridge bone is urged in the limb-opening direction, and the muscle material antagonizes each other, so that the muscle material is casing. It is housed in the central position.

At the same time as the casing is removed, the legs are opened outward to extend the skeleton over a wide area within the insertion layer to enhance the reinforcing effect. Further, the filling material is ejected from the ejection port on the side wall of the rod to fill the voids, whereby the reinforcing material and the soil in the layer are integrated to form an extremely strong inner reinforcing soil. Further, the casing is provided with an appropriate joint structure, and the joints can be connected one after another to allow insertion of the reinforcing material over a long length.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a casing, which is a hollow tube of 60 to 70φ and a length of 2 to 3 m. A female screw 11 is engraved on the inner side of the tip and a male screw 12 is engraved on the outer side of the rear end with right-hand threads so that joints can be made one after another from the rear end. Is configured. The crown bit 13 is mounted at the leading edge by a fitting structure, and is detached when the casing 1 recedes linearly. Numeral 2 is a muscular material, which is a skeleton that opens radially around a shaft rod 21 composed of a hollow tube of 20 to 30φ.
22 and 22 are provided at appropriate intervals, and joint screws 23 and 24 similar to those of the casing 1 are engraved at the front end and the rear end, and the tip end is connected to the crown bit 13. The shaft rod 21 is provided with ejection ports 25, 25 at appropriate positions on the side wall so that the filling material and the hardening material which are pressure-fed to the hollow portion 26 can be ejected or injected. It should be noted that the hollow portion of the shaft rod 21 and the ejection port are not necessarily provided depending on the condition of the target ground.

The bracing member 2 thus configured is housed in the casing 1,
The casing 1 is attached to the rotary up-and-down motion device 3, or is inserted into the target ground while appropriately performing joints by an appropriate means such as by pushing jack or by percussion hitting, and the casing is straightened at a predetermined depth. When the casing 2 is retracted, the casing is separated from the crown bit 13, and the muscle 2 is removed while remaining.

Next, when the hardened ground material is pumped into the hollow portion 26 of the rod, the hardened material is ejected from the ejection port 25 and fills the voids created between the inserted soil and the reinforcing material, and the soil and the reinforcing material are closely integrated. As a result, the reinforcing effect is enhanced.

The casing can be inserted vertically or horizontally, but when the target ground is a ground hardening material injection layer, a support structure similar to that of reinforced pile is placed in the ground can be obtained. Next, an example in which a hardening material-injecting layer is used as a target ground and a hardening layer containing a reinforcing material is formed will be described.

The hardening material injecting device 4 is provided with a moving means 3 such as a cart or a caterpillar, and is loaded with a support base 41 for supporting the injecting mechanism and a vertical movement mechanism 42 for moving the up and down. The support base 41 is provided with actuating mechanisms 44 and 45 for inclining the guide rail 43 that guides the forward and backward movement of the injection rod 5 back and forth, and in cooperation with the vertical movement mechanism 42, the part direction of the guide rail 43 can be operated. It has become. Furthermore, the guide rail 43 chucks the injection rod 5 to rotate it, and at the same time, to rotate it on the rail.
46 is provided, then a percussion drive mechanism 47 is provided at the tail end position of the rod 5, and a swivel 6 is present at the rear portion thereof.

The tip of the injection rod 5 is provided with a digging blade 51 and a tip injection nozzle 52, and the rear end is connected to the hardening material supply hoses 61 and 62 through the swivel 6. Further, the injection nozzle 52 has a double structure of a nuclear opening and a peripheral opening, and ejects a hardening material from the opening N1 and air from the peripheral opening N2. By doing so, the hardening material jet is surrounded by the air jet and the flow force can be strengthened.

Using the apparatus as described above, the tip of the rod is first inserted into the target ground W by percussion or rotation, and then a lubricating liquid such as fresh water is pressure-fed from the supply hose to rotate the rod while ejecting it from the injection nozzle 52, and percussion. Thus, the tail end of the rod is continuously hit to insert the injection rod 5 to a predetermined depth of the target ground W. The injection rod 5
Is equipped with a joint mechanism and is joined to a certain length.

When it has been inserted to a predetermined depth, the injection rod 5 is fed while the ground hardening material is being pressure-fed and supplied to the flow path leading to the injection nozzle 52.
Is retreated while applying an operation such as rotation, and the hardening material is injected and mixed into the soil around the rod to form the ground hardening material injection layer M.

FIG. 4 is an example of the case where the ground hardening material injection layer is formed in the vertical direction. Since the directionality is simpler than in the case of the horizontal direction, the vertical movement mechanism 42 and the like are unnecessary and the basic process is The configuration is the same.

When the hardener injection layer M is formed in this way,
The chuck is removed from the rotation drive device 46, and the injection rod 5 is attached to the muscle material 2
The muscular material is inserted into the central portion of the hardened material injecting layer M in the center portion of the hardened material injecting layer M and opened to open before the hardened material of the injecting layer M is hardened by switching to the casing 1 containing The built-in hardened layer is created.

[Advantages of the Invention] Since the present invention is configured as described above, it is possible to efficiently insert reinforcing reinforcements into the ground over a long length, and to enable tight insertion of reinforcements with high reinforcement effect. At the same time, it is possible to create a hardened layer with a built-in reinforcing material, which is as strong as a reinforcing steel pile.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is an overall perspective view showing a relationship between a reinforcing material and a casing in a perspective state, and FIG. FIG. 3 is a side view showing the whole ground hardening material injecting / casing inserting device, and FIG. 4 shows another embodiment in which a hardening layer containing a reinforcing material is vertically formed. FIG. 5 is an enlarged explanatory view of the tip portion of the injection rod in the case of the embodiment. 1-Casing, 11-Fitting female thread, 12-Fitting male thread, 13
~ Crown bit, 2 ~ Muscle, 21 ~ Axle, 22 ~ Radially supporting skeleton, 23, 24 ~ Muscle joint screw, 25 ~ Spout,
26-hollow part, 3-moving means, 4-curing material injection device, 41-
Support base, 42-vertical movement mechanism, 43-guide rail, 44.45-actuation mechanism, 46-rotation drive device, 47-percussion drive mechanism, 5-injection rod, 51-excavation blade, 52-injection nozzle, 6-swivel, 61, 62-hardening material supply hose, 63-supply hose take-up reel, N1-nuclear opening, N2-circumferential opening M-ground hardening layer, W-target ground, m-filling part

Claims (3)

[Claims] Claims: 1. A reinforcing member, which is provided with supporting ribs that open radially around the shaft rod at appropriate intervals, is inserted into the hollow casing while the supporting ribs are biased outward, and the casing is targeted to the ground. After inserting into the inside, the method of inserting the reinforcing bar is characterized in that only the casing is removed leaving the bar. 2. A stiffener in which a skeleton that radially opens around a shaft is provided at an appropriate interval is incorporated in the softened stiffener injection layer before the stiffener of the stiffener injection layer hardens. A method for constructing a stiffened layer with a built-in stiffener characterized in that the casing is inserted, and only the casing is removed to open the skeleton in the stiffener injection layer to incorporate the stiffener. 3. Reinforcing bar material provided with supporting ribs that are open in a radial direction centered on a shaft rod that is hollow and has a jet outlet on the side wall, at appropriate intervals.