JPS63181813A - Construction of steel tubular sheet pile - Google Patents

Abstract

PURPOSE:To simply and exactly set and connect steel tubular sheet piles by a method in which steel tubular sheet piles are set into an excavated pit while joining their couplers. CONSTITUTION:A pit 8 is excavated adjacently to a reference pile 2 by an excavator 6 while joining the guider 7 of the excavator 6 to the coupler 3' of the pile 2 under the guidance of the joint. In penetrating a steel tubular sheet pile 9 into the pit 8, the setting is made while joining the coupler 3' with the coupler 3. Excavation for the pit 8 is made while turning not only an auger head 4 but also a casing 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a method for continuously erecting and connecting large diameter steel pipe sheet piles into the ground.

[Background technology 1] Conventionally, steel pipe sheet piles were built by driving them into the ground on rocky shores, which caused vibration and noise. Therefore, one possible method to avoid generating vibrations and noise is to use an excavator to drill a hole and install a *W pile into the hole, but in this case, the hole drilled next to the hole is There was a risk that the wIW piles would be excavated at an angle, making it impossible to expect accurate erection of the wIW piles, and there were also problems in that it was not easy to connect steel pipe piles to each other.

[Object of the Invention] The present invention was invented in view of the above points, and its purpose is to provide a construction method for W4 pipe sheet piles that allows easy and accurate erection and connection of steel pipe sheet piles. There is something to do.

[Disclosure of the Invention] The method for constructing a steel pipe sheet pile according to the present invention is to erect a reference pile 2 having a joint portion 3' on the side in the ground 1, and install a joint 81S3 on an excavator 6 that combines an auger head 4 and a casing 5. '
A guide member 7 is provided that can be freely engaged vertically with respect to the reference pile 2, and the guide member 7 is connected to the joint of the reference pile 2 &! Drilling an excavation hole 8 in the ground 1 by rotating the O-herad 4 and the casing 5 while engaging with S3' and serving as a guide for excavation,
Next, the excavator 6 is pulled out, and one joint part 3 of the steel pipe sheet pile 9 having joint parts 3 on both sides is connected to the joint part 3' of the reference pile 2.
is installed in the drill hole 8 while engaging with the drill hole 8, and then the drill hole 8 is
Excavation 8!6 in the other joint 3 of the steel pipe sheet pile 9 built in
After engaging the id member 7 provided in the holder and rotating the auger head 4 and casing 5 to drill the excavation hole 8 and pulling out the excavator 6, the other joint of the steel pipe sheet pile 9 that has already been erected is 3, insert the next w4W sheet pile 9 into the excavated hole 8 while engaging one of the joint parts 3, and similarly, sequentially insert the steel pipe sheet piles 9 and connect the steel pipe sheet piles 9 by engaging with each other at the joint part 3. By employing such a configuration, the above-mentioned object of the present invention can be achieved. That is, in the present invention, the joint portion 3' of the reference pile 2
Using this engagement as a guide, the excavator 6 accurately drills an excavation hole 8 next to the reference pile 2 while engaging the ID member 7, and inserts #4 pipe sheet pile 9 into this excavation hole 8. By inserting and building the steel pipe sheet piles 9 while engaging the joint parts 3' and 3, the steel pipe sheet piles 9 can be accurately built and connected, and the steel pipe sheet piles 9 can be installed in the same way. It is possible to connect, and also has an excavated hole 8 for erecting the steel pipe sheet pile 9.
When drilling, not only the head 4 but also the casing 5 are rotated while drilling, which prevents the collapse of the excavated hole 8 for erecting the steel pipe sheet pile 9, as well as ensuring the verticality of the excavated hole 8 while ensuring accurate accuracy. It is now possible to easily drill holes of the same diameter.

The present invention will be explained in detail below with reference to Examples. The reference pile 2 has a joint portion 3' on its side, and in the present invention, the reference pile 2 is first built into the ground 1. Reference stake 2
For example, the construction is carried out as follows. That is, an excavator 6' as shown in FIG. 1(a) is used to excavate the ground 1 to form an excavated hole 8'.

The excavation 8!6' has a casing 5 disposed around the outer periphery of the excavation shaft 10, and a head 4 is provided at the part of the lower end of the excavation shaft 10 that protrudes downward from the casing 5. The head 4 rotates in conjunction with the head 4. In the embodiment, as shown in FIG. 5, a connecting member 11 is fixed to the lower end of the excavation shaft 10, and the outer circumference of this connecting member 11 is fixed to the casing 5. At the part f, the lower end of the casing 5 The member 12 hanging from the auger head 4 is placed against the side surface of the auger head 4 in the direction of rotation, and as the auger rotates the excavation shaft 10 having the head 4 at its lower end, the casing 5 also rotates at the same time. There is. Thus, the auger head 4 and the casing 5 are rotated, and the drilled hole 8' is excavated while jet water is spouted upward and downward from the auger head 4 and the excavation shaft 10 as shown in FIG. In this case, if the drilling hole 8' to be drilled is deep, the casing 5 and drilling shaft 10 are
As shown in Figure 1 (b), excavation is continued to a specified depth. When the excavation is completed to a predetermined depth, bentonite stabilizing liquid 13 is discharged and grouted to prevent collapse of the excavated hole 8'.

In this case, the operation of rotating and lifting the casing 5 up and down is performed while injecting the bentonite stabilizing liquid 13. Note that depending on the ground, excavation may be performed while discharging bentonite stabilizing liquid 13 from the beginning. In this way, the bentonite stabilizing liquid 13 is injected into the entire length of the excavation hole 8', and the casing 5 and the excavation shaft 10 having the O-shaft 4 at the lower end are pulled up. Similarly, the excavation hole 8!6' is moved to excavate the next excavation hole 8' for the reference pile.

A reference pile 2 is erected into the excavated hole 8' by a crawler crane 14 or the like.

If the excavation hole 8' is deep, the upper reference pile 2 is built following the lower reference pile 2, and a welded joint is performed to make the excavation hole 8'.
It is to be unloaded. In this case, the vertical direction is transit,
It is checked using an inclinometer, and the horizontal direction is controlled by attaching a ruler.

Then, it is installed while checking the verticality, and if necessary during the final installation, it is press-fitted with a hydraulic pusher fi15 as shown in Fig. 1(e). Here, the reference pile 2 is formed of a steel pipe similarly to the later-described a-pipe arrow @9, and a joint portion 3' is provided over substantially the entire length on one or both sides. The joint MS3' has a female joint part 3a' in which the side opening is sandwiched between the inner parts, or an R11 hand part in which the side end part that can be engaged with the groove joint part 3a' is an enlarged part. Either one is provided.

Next, using an excavator 6 having a gamma-id member 7, the guide member 7 is engaged with the joint part 3' of the already erected reference pile 2, and the excavator 6 is used to drive a steel pipe sheet pile next to the reference pile 2. Drill a borehole 8.

The excavator 6 used here basically has the same structure as the excavator 6' for erecting the excavated pile 2 described above, and differs from the excavator 6' in that it is provided with a γ-id member 7. . That is, the excavator 6 has a configuration in which a guide member 7 is provided on the excavator W16'. The f-id member 7 is rotatably attached to the casing 5 or the excavation shaft 10. In the embodiment shown in FIG. 2, a guide member 7 is provided on a rotary support 16 rotatably attached to the outer periphery of the casing 5, and in the embodiment shown in FIG. The bittern member 7 is attached. Then, the auger head 4 and the casing 5 are rotated while the guide member 7 is engaged with the joint portion 3' of the reference pile 2 to serve as an excavation guide, and the excavation hole 8 is bored in the ground 4f11. In this case, the excavation is carried out to a predetermined depth while jet water is injected upward and downward from the excavation shaft 10 or the auger head 4.

In this case, by engaging the joint part 3' of the reference pile 2 that has already been erected with the guide member 7 and excavating while keeping this engagement, the verticality of the casing 5 can be ensured and the guide member 7 can be excavated accurately. The excavation ends. Here, in the present invention, by rotating the casing 5, the casing 5 can be made to reach a predetermined depth without resistance. In this case, the jet water injected upward flows between the casing 5 and the hole wall of the borehole 8, further reducing the frictional resistance when the casing 5 enters, and allowing the casing 5 to move more smoothly.
can reach a predetermined depth.

When the excavated hole 8 to be excavated is deep, the casing 5 and the excavated pongee 10 are added and the construction is continued in the same way as in the case of the excavator 6'. When a predetermined depth is reached, the bentonite stabilizing liquid 13 is discharged while rotating and stirring and repeating up and down operations to prevent the excavation hole 8 from collapsing. After that, the excavation 1596 was pulled out, and then the bentonite stabilizing liquid 13 was injected into the agitated excavation hole 8 and the steel pipe sheet pile 9
It is something that builds in. In this case, the steel pipe sheet pile 9 is provided with a joint portion 3 similar to the joint portion 3' provided on the reference pile 2 over substantially the entire length on both sides. Similar to the joint part 3' of the reference pile 2, this joint part 3 has a female joint part 3a in which the side opening is sandwiched between the inner side or a side end part that can be engaged with the groove joint part 3a. is one of the male joints g3b which has become an ampulla. And it has joint parts 3 on both sides! One joint part 3 of the llill plate pipe is inserted into the excavated hole 8 while engaging with the joint part 3' of the reference pile 2. In this case, if necessary at the time of final insertion, a hydraulic pusher fi15 may be used to statically press fit. In addition, the verticality during construction is checked using Transshift 2 and an inclinometer. Further, if the excavated hole 8 is deep and a long W4 pipe sheet pile 9 is required, the connection is made by welding as shown in FIG. 3(a). 20 in the figure fIfJ3 indicates a welded part.

Next, the guide member 3 provided on the excavator 6 is engaged with the other joint 3 of the steel pipe sheet pile 9 built in the excavated hole 8, and the O rotates the head 4 and the casing 5 in the same manner as above. Then, the next drilling hole 8 is drilled.

After pulling out the excavation fi 6, one joint part 3 of the next steel pipe sheet pile 9 is engaged with the other joint part 3 of the already installed steel pipe sheet pile 9, and the excavated hole 8 is erected, and in the same manner, one after another. The steel pipe sheet piles 9 are erected and the steel pipe sheet piles 9 are engaged and connected to each other at the joint portion 3.

In this way, the excavated holes 8 are drilled one after another, and the steel pipe sheet piles 9 are installed in the excavated holes 8, and the adjacent steel pipe sheet piles 9
Connect the joints 3 of the steel pipe sheet piles 9, and then build the joints 3 of the steel pipe sheet piles 9 at the other standard piles 2, which were excavated and erected in a distant place. and the joint portion 3' of another reference pile 2 are engaged and connected.

In addition, the diameter of the excavated hole 8' for erecting the reference pile 2 should be slightly larger than the distance between the joints 3' on both sides if joints 83' are provided on both sides as the reference pile 2. As shown in Fig. 4, the excavated span of the excavated hole 8 for erecting the steel pipe sheet pile 9 is slightly longer than the length from the protruding tip of one joint part 3 to the protruding base of the other joint part 3. (In FIG. 4, N indicates the diameter of the casing 5.

In the above embodiment, the reference piles 2 are first erected at multiple locations, and the steel pipe sheet piles 9 are erected and connected between the reference piles 2 from one reference pile 2 to the other reference pile. The standard pile 2 is erected, and using this as a base, the steel pipe sheet piles 9 are successively erected and connected, and finally, returning to the starting point of the standard pile 2, the last steel pipe sheet pile 9 and the standard pile 2 are connected. The connection may be made at the portion 3.3'.

Furthermore, when a W4 pipe sheet pile 9 is built into the excavated hole 8, a hole is later drilled between the hole wall of the excavated hole 9 and the outer wall of the steel pipe sheet pile 9, and cement milk, mortar, etc. are poured into the outer periphery. may be strengthened.

In this case, a hole may be similarly drilled between the hole wall of the excavated hole 8' and the outer wall of the reference pile 2, and cement milk, mortar, etc. may be introduced thereinto to strengthen the outer periphery.

[Effect of the invention 1] Since the present invention is constructed as described above, the guide member of the excavator is engaged with the joint of the reference pile, and the excavator is used to accurately move the reference pile using this engagement as a guide. By drilling an adjacent excavation hole and inserting the steel pipe sheet pile into this excavation hole, the joint parts are engaged with each other when erecting, making it possible to easily and accurately erect and connect the steel pipe sheet pile. Similarly, steel pipe sheet piles can be connected easily and accurately, and when drilling holes for installing steel pipe sheet piles, not only the auger head but also the casing are rotated. This prevents the collapse of an excavated hole for erecting steel pipe sheet piles and ensures the verticality of the excavated hole, making it possible to efficiently and easily form an excavated hole with an accurate diameter.

[Brief explanation of the drawing]

Figure 1 (a), (b), (e), (d), and (e) are explanatory diagrams showing the order for erecting reference piles in the present invention, PIIJ
Figure 2 (,) (b) is a plan view and side view of the state in which steel pipe sheet piles are erected based on the same reference pile as above, and Figure 3 (a)
) (b) is an explanatory diagram of the state in which steel pipe sheet piles are connected vertically and erected, and an explanatory diagram of the state in which they are pushed in by a hydraulic pushing machine, Fig. 4 is an enlarged plan view showing the construction state of the present invention, and Fig. 5 6 is a cross-sectional view showing the installation state of the upper casing of the excavator, and FIG. 6 is an explanatory view of another embodiment of the present invention.
is the ground, 2 is the reference pile, 3 is the joint part, 3' is the joint part, 4 is the auger head, 5 is the casing, 6 is the excavator, 7 is the gamma side part, 8 is the excavation hole, and 9 is the steel pipe sheet pile. . Figure 1 Figure 1 (b) Figure 1 (d) Figure 2 (b) Figure 3

Claims (1)

[Claims] (1) A reference pile with joints on the side is built into the ground,
An excavator that combines an auger head and a casing is provided with a guide member that is slidably engaged with the joint part up and down, and the guide member is engaged with the joint part of the reference pile to serve as a guide for excavation, Rotate the casing to drill a hole in the ground, then pull out the excavator, and then engage one joint of the steel pipe sheet pile, which has joints on both sides, with the joint of the reference pile while building in the hole. Then, the guide member installed on the excavator was engaged with the other joint of the steel pipe sheet pile installed in the excavation hole, the auger head and casing were rotated to drill the excavation hole, and the excavator was pulled out. After that, one joint part of the next steel pipe sheet pile is engaged with the other joint part of the steel pipe sheet pile that has already been erected, and one joint part of the next steel pipe sheet pile is inserted into the excavated hole, and in the same way, the steel pipe sheet piles are erected one after another, and the steel pipe piles are connected to each other at the joint part. A method for constructing steel pipe sheet piles, which is characterized by engaging and connecting with each other.