JPS6115079Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to the retention of sheet piles in earth retaining works and the main piles of temporary piers. Conventionally, when constructing buildings underground or installing public facilities under road surfaces, various construction methods such as steel sheet piles, H-steel piles, and sheet piles have been used. Particularly in the case of medium- to large-scale construction work, the noise and vibration generated when driving and pulling out steel sheet piles and H-shaped steel become a social problem as a source of pollution, and in urban areas, there are strict legal restrictions on such work. It has become relatively difficult. Therefore, as a solution to this problem, we are currently using a drilling machine and a vibro for driving.
Two methods have been adopted, a jet pump and a vibro, but the former requires installing H-steel piles etc. during drilling, driving them in slightly, and filling the surrounding area with poorly mixed mortar or other materials. In addition, the latter involves various time-consuming and costly work, such as welding a retaining band for the high-pressure jet pipe to the steel sheet pile or H-steel pile. In the drawing method, new models such as micro-vibration vibros, pulley pullers, and hydraulic pullers have been developed, but in general, vibros with vibration effects are still widely used. Also, if the bottom of the excavation is lower than the nearby groundwater level,
Naturally, drainage equipment will be provided, but if the construction requires dry work, use a well point, vacuum deep well, etc. where soil and water can be completely separated, to forcibly drain underground water using vacuum and atmospheric pressure. Construction methods are being used to eliminate water collection. However, in such cases, in many cases, the work is outsourced to a specialist drainage company separate from the company that performs the main work, and a corresponding amount of construction costs are unavoidable. Therefore, in general, pot drainage is the mainstream, as it has simple equipment, low cost, and easy operation. However, with this drainage method, the water that has seeped into the excavation area is allowed to flow down naturally to a concentrated area slightly deeper than the bottom of the excavation, and is then discharged using a submersible pump or a self-priming pump. Due to repeated digging and movement, excavation work is suspended for a while, and the flowing water dissolves soil particles and becomes polluted, and some of the soil becomes muddy.Drainage and excavation after rain, in particular, spreads polluted water and sludge. This results in a flickering result. As a result, they cause a nuisance to neighbors and the general public, and there are many cases in which downstream sewer pipes and drainage channels are filled with mud, leaving the residents at a loss as to compensation and cleanup. The present invention has been devised specifically to eliminate the above-mentioned drawbacks and add new construction advantages, and will be described in detail below with reference to the drawings. As shown in Figure 1, the diameter depends on the excavation depth,
First, an appropriate number of bolt penetration holes 2 for attaching various caps, which will be described later, are bored in the exterior of the main pipe 1, which has a certain thickness and length, at appropriate positions at the upper end. As shown in FIG. 2, the guide angle 3 has a sheet pile insertion part and a bolt hole for attaching steel material continuously drilled above the main pipe 1.
A band 4 is welded, and the band 4 is brought into close contact with the main pipe 1, and is tightened with a bolt so that it can be attached and detached. Furthermore, as shown in FIG. 3, a slot with an opening ratio of 15 to 20% relative to the outer circumferential surface is bored in the peripheral wall of the lower root part to form a strainer 5. and master 1
An inverted truncated cone-shaped pointed metal fitting 6 having a fitting hole 11 for the nozzle 24 is fitted into the main pipe 1 at the lower end thereof, and is tightened from the outside of the main pipe 1 with a screw bolt. Furthermore, the interior is equipped with two or more pairs of pressurized air pipes 7 that penetrate from the upper end of the main pipe 1 to an appropriate position below the root, and as shown in FIG. , the outer surface of the pneumatic pipe 7 is welded 8 to be fixed to the inner wall of the main pipe 1. However, welding 8 is not performed up to approximately 2 m from the upper end of the main pipe 1 in order to insert a ring spacer 35, which will be described later. In addition, a spiral blowhole 9 is bored at a suitable position below the root of the main pipe 1, as shown in FIG. Screw in the bolt 10. Furthermore, connection screws are carved on the outside of the upper end of the pressure pipe 7 and on the inside of the lower end, respectively. Note that the guide angle 3 is connected to the main pipe 1 as described above.
Although it can be attached and detached freely by the action of the band 4, the attachment angle can be arbitrarily selected by the upper and lower attachment positions of the left and right guide angles 3 and by doubling the bands 4. Although the present invention has the above-mentioned configuration, the main pipe 1 and the guide angle 3 are each required to have a required length and rigidity corresponding to the excavation depth. Therefore, the dimensions generally adapted to this are shown in the table on the next page. As shown in the table on the next page, this project will be used as main piles for earth retaining and temporary bridges in large and small construction projects, and in some cases as casings for deep wells, and the work of driving and pulling them out and the use of various drainage methods. Specific examples, such as methods and methods of attaching various rigid materials to the main pipe 1, will be described below. In order to install the main pipe 1 of this project without noise and vibration, the combination of the above-mentioned hole drilling machine and vibro,

[Table] Two methods are used: a jet pump and a vibro. In the former method, the hole wall that has been drilled and a certain space created on the outer wall of the main pipe 1 must be filled with some kind of material. For example, it is an extremely suitable construction method to fill this space with the well-known deep well drainage construction method, in which gravel and crushed stone are introduced to allow groundwater to flow in. However, in order to use main pipe 1 as the main pile of earth retaining, there is a risk that the soft earth filling the space will collapse during earth retaining work, and there is also a possibility that it will be washed away by rainwater. The explanation will focus on the use of the latter construction method, which does not damage the area. First, in order to install the water jet device in the main pipe 1, as shown in FIG. A lance 26 (high pressure pipe) of the required length is installed through it. In that case, the method of holding the nozzle 24 at the lower end is the fitting hole 11 of the pointed fitting 6.
The upper end is fixed by a driving cap 21. However, this drive-in cap 21 has a lifting cap 22 equipped with a bracket 27 which is chucked by a vibro on one side, and a lifting cap 22 with a bracket 27 on the other side.
It consists of an ordinary cap 23 which does not have
The lid plates of both caps 2 and 23 are fitted onto the head of the lance 26. It is inserted into two upper and lower sockets and tightened to the head of the main pipe 1 with a screw bolt. The installation work described above is carried out with the main pipe 1 lying on the ground, but immediately before the driving work, a separately prepared
A high-pressure hose of a required length connected to the jet pump is fitted into the connector 25 at the upper end of the lance 26, and preparations for driving on the ground are completed. While lifting the head of the main pipe 1 prepared as described above using a single-wound wire of a crane prepared separately, the bracket 2 of the lifting cap 22 is attached to the vibro which is also suspended from the main wire with a pulley.
After checking 7, erect it vertically in the specified position and gradually start the jet pump. Then, the pressurized water ejected from the nozzle 24 at the lower end of the main pipe 1 drills the ground directly below with tremendous force, turning the hole wall into mud. In other words, both the resistance forces of support at the tip of the main pipe 1 and friction around the periphery are eliminated. Therefore, when driving, basically, the main pipe 1 sinks only by its own weight and the weight of the vibro during drilling. Furthermore, even if a highly consolidated stratum is encountered, sufficient driving can be achieved by adding a slight vibration effect from the vibro. In addition, when removing the above-mentioned device, first remove the high pressure hose, and
Lifting bracket 28 of lance 26 welded to
Put a single winding wire on the main wire, release the vibro suspended from the main wire, and connect the driving cap 2.
1, the lance 26 is lifted up and lowered to another location on the ground where it can be easily attached to the main pipe 1. If several sets of driving devices are prepared separately, driving work can be performed without interruption. However, this construction method also takes into account the constant replenishment of jet water and the treatment of muddy water that has spewed out on the ground, and at the same time, it also takes into account the completeness of the necessary power equipment, the size of the main pipe 1 used at the site, It is also necessary to choose cranes, jet pumps, vibros, and water tanks that have functions that are compatible with the environment. Next, when the main pipe 1 is to be pulled out, a pull-out cap 31 is attached to the head of the main pipe 1, as shown in FIG. To do this, first, apply a lever to the entire upper end of the pneumatic pipe 7 attached to the inner wall of the main pipe 1 and bend it slightly inward. Then, the ring spacer 5 is inserted into the gap formed between the ring spacer 5 and the main pipe 1. This creates a space at a constant interval between the main pipe 1 and the pneumatic pipe 7, and a bottom cap 32 having a flange at the upper end and a bottom hole in the bottom plate into which the head of the pneumatic pipe 7 fits is formed. are fitted along the inner wall of the main pipe 1. Further, a rubber gasket is fitted onto the head of the compressed air pipe 7, a pipe socket is screwed into the connecting screw at the upper end of the rubber gasket, and the pipe socket is tightened from the outside of the main pipe 1 with a screw bolt. Next, from above,
When a top cap 33 with an air hose connector 34 welded to the top and a flange similar to the one described above is welded to the bottom end with a gasket inserted, and the flanges of both caps 32 and 33 are tightened with bolts, a sealed pressure air chamber 36 is formed. A pull-out cap 31 is formed which encloses the. And a connecting tool 34 attached to the top of the
By connecting the air hose that leads to the separately prepared compressor, installation of the head of the main pipe 1, which will be used for extraction work, is completed. In addition, to add some explanation of the preparations related to the same work, as mentioned above, when supplying air directly from the compressor to the connected air hose, if the main pipe 1 has a small diameter and short length, It is possible to draw out the air with the amount stored in the air tank attached to the compressor, but in the case of a long main pipe 1, some of the delivered air may be moved away from the vicinity of the main pipe 1 and placed in a place with good air permeability. Kara Ichiki (blow)
Otherwise, it may be absorbed into other spaces, lowering its pressure, and making it impossible to effectively cut the friction (circular friction force) of the main pipe 1. Therefore, in order to increase the amount of air stored at a constant pressure, we prepared several separate air supply pipes (stripe-wound steel pipes), attached a suction port on one side and a discharge port on the other side, and attached an air hose to each, and a compressor and a compressor. If connected to the connector 34 of the pull-out cap 31, the long main pipe 1
But it can be pulled out. In addition, I would like to explain the details of the extraction work.
Separately from the air-related equipment mentioned above, prepare a crane with functions suitable for the dimensions of the main pipe 1, hang a lifting wire through the upper end bolt hole of the guide angle 3 that is in close contact with the main pipe 1, and After applying the lifting load of the crane and checking the connections of all air equipment, gradually open the discharge pot and leave it half-open for a while. Then, the air immediately after being supplied instantly passes through the air hose, the pressure chamber 36, and the pressure pipes 7, and some of the air passes through the blowhole 9.
Some of it is ejected into the ground from the tip nozzle fitting hole 11 of the pointed metal fitting 6 into the bottom board, and the rest is ejected from the main pipe 1.
diffuses inside. Then, as the pressure inside the main pipe 1 increases, the ejected air gradually rises along the outer circumferential surface of the main pipe 1, pushing up groundwater and removing surrounding earth and sand, and eventually begins to form small bubbles on the ground surface. When the discharge socket is fully opened, the main pipe 1 begins to move upwards slightly, and at the same time as the lifting load is further applied, when the discharge socket is fully opened two or three times, the friction of the main pipe 1 has already been cut, and New lifting loads and buoyancy are added,
Can be lifted smoothly. When it is halfway pulled out, it is stopped, the discharge pot is closed, and the remaining air is diffused into the atmosphere, and then the entire length is pulled out and lowered to a predetermined position. However, in order to perform this extraction work efficiently, the main
Various machines suitable for the dimensions of
Although it is necessary to prepare an air hose 3 to 4 times the length of the main pipe 1, the required number of spirally wound steel pipes, and multiple pull-out caps 31, it does not require special machines or special workers that are otherwise difficult to secure. . Next, we will discuss various drainage construction methods related to Main Pipeline 1. When the main pipe 1 is inserted as described above, not only the used injection water but also the surrounding ground water flows into the main pipe 1 through the strainer 5 installed below the main pipe 1.
It is stored inside and below. As shown in FIG. 9, prior to excavation work, a submersible pump 42 was inserted into the main pipe 1 at an appropriate location, and a drain hose 43 and cap tire 44 were passed through the drain cap 41 and fitted onto the outer periphery of the main pipe 1. After that, by tightening the main pipe 1 from the outside with screw bolts, you can create a drainage system for short-term construction work in a small area. By placing the groundwater level below the bottom of the excavation in this way, the soil and water can be completely separated, making it possible to carry out so-called dry excavation work, and the water being removed is not polluted; The main pipe 1 will play the role of a small well. Therefore, depending on the groundwater level, strata, environment, etc. of each construction site, although not shown, a foot valve may be fitted to the lower end of the pressure pipe 7 before being driven in.
A similar effect can be achieved by installing a turbine pump, a self-priming pump, or any other suitable pump for drainage. In addition, if the area near the bottom of the excavation is a stratum with high permeability and a large amount of water, as shown in Fig. Install a 3-inch saxin pipe fitted with a pipe. Then, insert the lid plate of the drain cap 51, which is divided into left and right parts, between the two upper and lower sockets fitted to the head, and tighten it with a screw bolt from the outside of the head of the main pipe 1, which is also prepared separately. The well-known Siemens well construction method can be performed by connecting all the pumps to the central pipe 54 and installing and operating a self-priming pump at a separate location (not shown). In the case of the above-mentioned centralized drainage system, a backup pump and power source are required in case of unforeseen circumstances, but water for construction can be obtained by installing discharge valves at appropriate locations in the central pipe. There are also advantages. Furthermore, in areas where both the excavation depth and the groundwater level are deep and there are strata with high permeability,
The known normal deep well construction method shown in FIG. 11 can be adopted. In this case, first, the supervisor 1
The strainer 5 selects a position corresponding to the aquifer, and the submersible pump 62 is inserted into the main pipe 1.
The pumping pipe 63 is added and gradually lowered to the planned water level drop line, and the drain cap 61 attached to the main pipe 1 is
Fixed by However, the drainage cap 6
1 has a joint socket for the water lift pipe 63 on the lower side of the cover plate, a fitting hole for the discharge bent pipe on the upper side, and a drain cap 61 is screwed into the water lift pipe 63 on the lower side, and is further attached to the inner wall of the main pipe 1. Insert the side plate along the sides and tighten the head of the main pipe 1 with a screw bolt. Furthermore, the discharge bent pipes are screwed in and fixed on the upper side. The drainage effect using this construction method can be achieved by installing a slease valve (not shown) at the discharge port, adjusting the balance between the amount of inflow and drainage of groundwater, and continuously operating the submersible pump 62, or by using a captire 64. There are two methods of intermittent operation by connecting the water level electrode 65 to a power source equipped with an automatic control device, but both require a spare pump and power source. Furthermore, in geological strata where both the excavation depth and the groundwater level are deep and the permeability is low, a main pipe 1 is installed at a location slightly distant from the excavation location, separate from the earth retention (therefore, the guide angle 3 is unnecessary), As shown in FIG. 12, a degree of vacuum is applied inside the main pipe 1, and groundwater is forced to flow in due to atmospheric pressure, and is pumped up and removed by a deep well pump. It is also possible to obtain the so-called well-known deep well construction method. However, when installing the main pipe 1 when using this construction method, as mentioned above, the main pipe 1 is built into a hole drilled by a drilling machine that has a larger outer diameter than the main pipe 1, and the outer peripheral space is Add gravel to filter 78.
However, the area near the ground surface is closed with clay soil79 to maintain airtightness. In addition, since this construction method forces groundwater to flow into the main pipe 1, fine sand may be mixed in. To prevent this, a mesh or saran net suitable for surrounding soil particles is wrapped around the outer circumference of the strainer 5. Furthermore, the main pipe 1 of this construction method is considerably deeper than the planned water level drop line, and the position of the strainer 5 is lowered.
At the same time, the submersible pump 73 is also lowered to a corresponding position while adding the lift pipe 72. The upper end of the water pump 72 is fixed by a drainage cap 71, which is divided into a lower main body and an upper top plate. The lower body is made of a steel pipe of the same size as the main pipe 1, and its upper end is a cover plate with a flange. A pipe fitting hole with a screw flange to which a water pump 72 can be fixed is installed on the lower side of the cover plate, and a vacuum pipe 76 which can be connected to a vacuum pump (not shown) is welded to the side plate. has been done. Further, the upper top plate has a flange similar to the lower main body, and a thick flange plate into which the head bent pipe of the lift pipe 72 is fitted is attached to the top plate, and the lower main body and the upper top plate are tightened with flange bolts. . The lower cover plate and the top plate are provided with holes for drainage, a cord for the water level electrode 74, and a captire 75, respectively. In this construction method, as described above, the inside of the main pipe 1 is required to be sufficiently airtight, so after all the internal equipment is installed, the upper end of the main pipe 1 and the lower end of the drain cap 71 are welded 80 on site. At this time, the bolt penetration hole 2 in the head of the main pipe 1 is sealed with a short bolt or gasket. Furthermore, when performing a pumping action, if a degree of vacuum is constantly applied within the main pipe 1, the efficiency of the submersible pump 73 may decrease due to the negative pressure. For this purpose, the water level electrode 74, captire 75, and vacuum pump (not shown) installed inside the main pipe 1 are connected to a power source equipped with an automatic controller 77 to keep the vacuum pump in continuous operation. Incidentally, when this drainage equipment is to be removed, it is sufficient to remove the entire device, cut the welded part of the head of the main pipe 1, attach the pull-out cap 31, and pull it out. Next, regarding the installation of steel materials in the main pipe 1, as shown in Figs. Bolt holes are continuously drilled at regular intervals on both the front and back sides. In both cases, when viewed from the excavation side, the rear part is the insertion part for the sheet pile, and the front part is the part to which the steel material is attached. Therefore, when installing the earth retaining steel, first install the bracket 8.
After attaching 1, place the belly stand 83, and place piece 8.
2, tighten each with bolts, and then tighten the strut 84.
If you pass it, earth retaining shoring will be formed. Furthermore, when installing girder supports for the lining plate or temporary support steel for buried pipes, first install the bracket 85, place the girder support channel steel 87 on top of it, and then attach the piece 86.
A sturdy girder support can be created by sandwiching the guide angle 3 and tightening it with suitable bolts on one side to the bolt holes in the guide angle 3 and on the other side to the bolt holes in the channel groove 87. As described above, by attaching pieces corresponding to various steel materials to the guide angle 3 attached to the main pipe 1 of the present invention, steel materials of each cross section can be divided horizontally, vertically, coated materials, etc. Can be tightened with bolts. As mentioned above, the proposed temporary steel pipe piles are free from the noise and vibration that conventionally occur during driving and pulling out, and can be safely constructed not only in urban areas but also in any construction site, and are environmentally friendly and free from underground water. You can choose the drainage method that suits your needs. Moreover, by attaching the pressure air pipe 7 and the guide angle 3 to the main pipe 1, its rigidity is increased, and the punching operation is simple, so that the penetration can be as deep as possible. Therefore, many earth retaining works that involve excavation require self-supporting construction methods or minimal shoring.
Moreover, since dry work can be done, mechanization and labor-saving of subsequent work, including excavation and transportation work, are promoted, and the work efficiency of the entire construction work is dramatically improved. Furthermore, since the installation angle of the guide angle 3 attached to the main pipe 1 can be freely selected, for example, circular,
All types of earth retaining structures, such as square and oval shapes, and excavation directions can be changed. Moreover, since the steel material is easy to install, it can be used not only as the main pile for earth retaining, but also as the main pile for temporary piers, work platforms, offshore dolphins, and various underpinning works. Furthermore, the proposed temporary steel pipe pile can be applied to a wide range of construction works, large and small, and as a result of being based on static construction methods,
There is almost no damage or deformation of the equipment, and the reuse rate is high, so the so-called compensation costs and repair costs are lower compared to conventional equipment, and it has a very high economic effect.

[Brief explanation of the drawing]

Fig. 1 is a front view of the main pipe 1 with some parts omitted and a cross section of one embodiment of the present invention, Fig. 2, and Fig. 3
Figures 4 and 5 are A-A and B of Figure 1, respectively.
- A cross-sectional view of sections B, C-C, and D-D; FIG. 6 is a partially detailed view of FIG. 5; FIG. Figure 8 is a longitudinal cross-sectional view of the main pipe 1 with a pull-out device installed at the upper end, and Figure 9 is a vertical cross-sectional view of the main pipe 1.
Figure 10 is a vertical cross-sectional view of the main pipe 1 equipped with a device of the Siemens drainage method, and Figure 11 is a vertical cross-sectional view of the main pipe 1 equipped with a device of the ordinary deep well drainage method. , Figure 12 shows main pipe 1.
Fig. 13 is a plan view of two examples showing the installation of steel materials to the main pipe 1, and Fig. 14 is a longitudinal cross-sectional view showing the installation of steel materials to the main pipe 1. Longitudinal cross-sectional view of a column. 1... Main pipe, 2... Bolt penetration hole, 3... Guide angle, 4... Band, 5... Strainer, 6... Pointed fitting, 7... Pressure pipe, 8...
Welding, 9... Fumarole, 10... Hollow bolt, 11
...Mating hole.

Claims (1)

[Scope of utility model registration request] A guide angle with a band welded to the upper part of the main pipe with a predetermined diameter and length is provided on the main pipe so that it can be freely removed.A suitable number of strainers are bored in the lower peripheral wall, and an external guide angle is installed on the inner wall of the main pipe. A temporary steel pipe pile made by welding a pressurized air pipe with a transparent fumarole that communicates with the pipe, and fitting an inverted truncated cone-shaped pointed metal fitting to the lower end.