JP3755977B2 - Standing pipe for pile formation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, for example, uses a ground excavator (for example, one having an excavating part such as an auger or a core bit) to form a pile, and from a work stage installed above the surface of the excavating target part, This is a pile-forming standing pipe that can be used to hold the drilling fluid such as water and ground stabilization liquid in the interior space. More specifically, the pile-forming ground excavation in the inner space The present invention relates to an upright pipe for pile formation in which a plurality of pipes through which tools can be inserted are connected in the pipe axis direction through a connecting portion.
[0002]
[Prior art]
Conventionally, as this kind of standing pipe for pile formation, as shown in FIG. 12, to constitute the connecting portion 14, the connecting end portion 13a of the first pipe disposed on one side at the connecting portion 14, And the flange part 30 is formed in each of the connection end part 13b of the 2nd pipe arrange | positioned by the said connection part 14 at the other side, and both flange parts 30 are bolt-joined via the sealing material 31. Some of them consisted of joints.
[0003]
[Problems to be solved by the invention]
According to the above-mentioned conventional standing pipe for pile formation, the flange portion is formed with high precision because the connecting portion is sealed by pressing the flange portions provided in the first and second pipes. Therefore, there is a problem that the manufacturing cost is high.
Furthermore, when connecting both pipes, after positioning both pipes so that the bolt holes formed in the flanges of both pipes are aligned (the state in which the bolts can be inserted), the bolts are inserted into the bolt holes. Since it is necessary to perform the fastening operation, it takes time to align the pipes, and there is a problem that the efficiency of the connecting work tends to be deteriorated.
[0004]
Accordingly, an object of the present invention is to provide a pile forming standing pipe that can solve the above-mentioned problems, can be formed at low cost, and can be easily connected efficiently.
[0005]
[Means for Solving the Problems]
〔Constitution〕
As illustrated in FIGS. 3, 8, 9, 10, and 11, the characteristic configuration of the invention of claim 1 includes a plurality of pipes 13 through which the pile forming ground excavating tool K 1 can be inserted in the inner space, and a connecting portion 14. In the standing pipe for pile formation that is connected in the pipe axial direction through the connecting portion 14, the connecting end 14 a of the first pipe disposed on one side of the connecting portion 14 A fitting portion 15 is provided in which the connecting end portion 13b of the second pipe disposed on the other side of the connecting portion 14 can be fitted in, and the inner peripheral portion of the fitting portion is in contact with the connecting end portion of the second pipe. A seal packing that can seal the joints is provided over the entire circumference , and a plurality of couplings that protrude outward along the pipe radial direction are attached to the outer circumferences of the coupling ends 13a and 13b of the pipes. The plate portion 16 is in a state where the plate surface is along the longitudinal direction of the pipe, and Integrally in a state of intervals in the circumferential direction of the connecting end portion 13a · 13b provided, wherein with is mounted a connector 17 detachably over both connector mounting plate portion 16, the connector both connector mounting It is in the place where the plate parts are constructed so that they can be pulled and operated .
[0006]
As illustrated in FIGS. 8, 9, 10, and 11, the characteristic configuration of the invention of claim 2 is provided with a reinforcing thick portion 21 formed thick in the circumferential direction at the connecting end portion 13b of the second pipe. The connector attachment plate portion 16 is formed on the reinforcing thick portion 21.
[0007]
As illustrated in FIG. 9, the characteristic configuration of the invention of claim 3 is an engaged plate that can be suspended by engaging a suspension engaging jig of a lifting device with the outer peripheral portion of the reinforcing thick wall portion 21. The portion 22 is formed.
[0008]
In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry.
[0009]
[Action and effect]
According to the characteristic configuration of the first aspect of the present invention, the connecting portion is configured such that the connecting portion of the first pipe disposed on one side of the connecting portion is disposed on the other end of the first pipe. A fitting part that can be fitted into the connecting end of the two pipes is provided, and a seal packing that can contact the connecting end of the second pipe and seal the joints is all provided on the inner peripheral part of the fitting part. A plurality of connector mounting plate portions provided over the circumference and projecting outward along the pipe radial direction on the outer peripheral portion of each connection end portion of both pipes, in a state where the plate surface is along the pipe longitudinal direction, and, wherein provided in a state in which intervals in the circumferential direction integrally of each connection end, wherein with is mounted a connector detachably over both connector mounting plate portion, the connector both connector mounting plate since the parts to each other are operated freely configured drawn, the coupling operation of each other the pipes Therefore, it is possible to arrange both pipes on the concentric shaft by simply fitting the connecting end portion of the second pipe to the fitting portion of the first pipe. It is possible to easily and quickly perform pipe connection by connecting corresponding connector mounting plate portions with a connector. And, even if the installation position of the connector mounting plate is slightly deviated or irregular in shape, there is little influence on the connection operation, as compared with the conventional method of forming the flange portion flat and accurately. Cost reduction can be achieved.
Furthermore, in the case where bending force is applied to the standing pipe for pile formation, for example, when the ground excavation tool for pile formation is inserted into the inner space, the first pipe is formed. A force in a direction along the perspective direction (pipe longitudinal direction) acts on the connector mounting plate portion formed on the second pipe and the connector mounting plate portion formed on the second pipe. By providing the plate surface in a state along the longitudinal direction of the pipe, it becomes possible to receive the cross-sectional force advantageously, compared with the plate surface of the connector mounting plate portion being provided in a state along the pipe radial direction. Therefore, it is possible to maintain a more stable connection state.
Moreover, since the seal packing is provided on the inner peripheral portion of the fitting portion over the entire circumference, the joint between the connecting end portions of the first pipe and the second pipe can be sealed.
Furthermore, since the said connector is comprised so that both connector attachment plate parts can be pulled and operated, the fitting force of both pipes increases and it becomes possible to comprise a more highly sealing connection part. .
[0010]
According to the characteristic configuration of the invention of claim 2, in addition to being able to achieve the function and effect of the invention of claim 1, in addition to the thickened reinforcement thickened in the circumferential direction at the connection end of the second pipe Since the connector mounting plate portion is formed on the reinforcing thick wall portion, both pipes can be connected more strongly. Incidentally, the connection end of the first pipe is substantially the same as the end connection of the second pipe, so that the effective cross-sectional area increases, which is the same as that of the reinforcing thick part. A reinforcing effect can be expected, and a balanced connection force can be secured.
[0011]
According to the characteristic configuration of the invention of claim 3, in addition to being able to achieve the function and effect of the invention of claim 1 or 2, in addition to the suspension engagement of the lifting device on the outer periphery of the thick reinforcing portion Since the engaged plate portion that can be suspended by forming the jig is formed, it acts on the engaged plate portion against the suspension of the pipe by the lifting device when each pipe is installed (or removed). The suspension load can be stably received by the thick reinforcing portion. Therefore, even if a special reinforcing portion for the reinforcing thick wall portion is not provided, the reinforcing thick wall portion can be realized by reinforcing the attachment portion of the connector mounting plate portion and the engaged plate portion. Thus, the material cost can be reduced.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts denoted by the same reference numerals as those in the conventional example indicate the same or corresponding parts.
[0013]
This embodiment shows one Embodiment of the method of rebuilding the existing building A provided with the existing underground structure part A1 shown in FIG. 1 to the new building (for example, megastructure structure) B shown in FIG. is there.
[0014]
In the building rebuilding method according to the present embodiment, a plurality of support piles (hereinafter simply referred to as “pile”) 1 are placed in the ground G in a state in which resistance can be given to the pulling force, and the upper end of the ground portion of each pile 1 is placed. With the mega truss 2 attached over the part, the existing underground structure part A1 is rebuilt to the new underground structure part B1 with the construction pillar 4 installed over the mega truss 2 and the foundation structure part 3 of the existing underground structure part A1. is there.
[0015]
The existing building A is a building to be demolished and includes an existing underground structure A1 and an existing ground structure A2. And the mountain retaining wall 5 used at the time of construction is left in the outer peripheral part of existing underground structure part A1.
And both the said existing underground structure part A1 and the existing above-ground structure part A2 are the structures provided with the floor of several floors.
Each floor is configured by providing a side wall portion 6 on the side surface, a floor structure portion 7, and a column structure portion 8 extending over the upper and lower floor structure portions 7.
And the said foundation structure part 3 is formed in the lowest part of the existing underground structure part A1.
Incidentally, the floor structure 7 is constituted by slabs 7a and beams 7b. The foundation structure 3 is constituted by a foundation slab 3a and an underground beam 3b, and a space between the intermediate beams 3b is formed in the pit portion 9.
[0016]
In addition, in the lower ground of the underground structure part A1, the highly pressurized water layer 10 is located, and if the existing building A is demolished as a whole, the foundation ground part that has been operating up to that point The building load is reduced, the balance with the upward pressurized water pressure of the highly pressurized water layer 10 is lost, and there is a high risk that the foundation ground part will be lifted and the phenomenon of blistering will occur.
[0017]
In the present embodiment, the new structure B has a megastructure structure in which the upper structure is supported by a small number of large support piles 1, and the upper structure is installed on the mega truss 2. Moreover, regarding the lower structure, it is installed on the new underground structure part B1 formed in the state including the foundation structure part 3 of the existing underground structure part A1.
[0018]
Next, a specific rebuilding procedure from the existing building A to the new building B will be described.
[1] As long as the balance with the pressurized water pressure in the foundation structure 3 is not lost, the upper structure of the existing building A is dismantled, and a part of the concrete waste 11 generated by the dismantling is illustrated. As shown in FIG. 2, the pit portion 9 is filled and concrete is filled in the voids in the pit portion 9 to achieve integration. And in that case, the lower end part of the stand pipe 12 (equivalent to the standing pipe for pile formation) 12 at the time of pile construction is embed | buried and integrated in the part which corresponds to the installation position of the said support pile 1. FIG. The stand pipe 12 is configured by connecting a plurality of pipes 13, and only the pipe 13 positioned at the lower end is embedded, and the remaining plurality of pipes 13 are reliably supported by the embedded pipe 13. After the above state, they are respectively connected through the connecting part 14 and started up to the work stage S on the ground.
[2] After the installation of the stand pipe 12, as shown in FIG. 3, the auger (equivalent to a ground excavation tool) K1 of the pile forming excavator K installed on the work stage S is used as the inner space of the stand pipe 12. And excavating the lower ground G, and constructing the support pile 1 in the excavation hole. Incidentally, the standpipe 12 is raised so that it can cope with the rise of the groundwater level in the excavation hole in conjunction with the ground excavation by the auger K1, and the water used for excavation and the ground stabilization liquid. It is carried out so that the drilling fluid such as can be held in the internal space.
Moreover, the said support pile 1 has formed the lower end part in the diameter-expanded state, and is comprised so that a bigger extraction force can be ensured. Of course, the support pile 1 is configured to support the new structure B.
[3] The mega truss 2 is attached over the upper end of the ground portion of each support pile 1, and the mega truss 2 can prevent the foundation structure 3 from being lifted. The true pillar 4 is installed (see FIG. 4). The structural pillar 4 is arranged according to the position of the pillar arrangement part in the new underground structure part B1, and is also used as a pillar of the new underground structure part B1. In this state, even if the building load decreases with the dismantling of the existing building A after that, the supporting force is applied to the pushing-up force acting on the foundation structure portion 3 via the construction pillar 4 and the mega truss 2. It becomes possible to balance with the pull-out resistance of the pile 1.
[4] When the superstructure of the existing structure A remains, the part is disassembled, and thereafter, construction of the superstructure of the new building B is started on the mega truss 2. When the load of the superstructure acts on the mega truss 2, it becomes possible to more effectively counter the pushing force from the foundation structure portion 3 through the structural pillar 4. Since the building load can be used effectively, the apparent load on the support pile 1 and the mega truss 2 can be reduced, and a highly economical design can be implemented.
Further, in the existing underground structure part A1, the structure pillar 4 and the floor structure part 7 are integrated in each floor structure part 7 portion through which the structure pillar 4 penetrates, and the underground structure part A1 At the time of dismantling, it can be used as a beam for external forces such as earth pressure and water pressure acting from the side wall portion 6. Then, for example, the existing structure part is sequentially dismantled from the upper floor of the underground structure part and a new structure part is formed by the reverse driving method (see FIG. 6), or the existing structure is formed from the lower floor of the underground structure part. The parts are sequentially disassembled and a new structure is formed by the forward striking method (see FIG. 5), or the new building B is rebuilt by a method such as the combined use of the reverse striking method and the forward striking method.
[0019]
Next, the stand pipe 12 will be described.
As described above, the stand pipe 12 used in the present embodiment is configured by connecting a plurality of pipes 13 through which the auger K1 can be inserted into the inner space through the connecting portion 14 in the pipe axis direction. It is. Note that the pipe 13 disposed at the lowermost position is embedded in the foundation structure portion 3.
[0020]
A fitting part in which a connecting end part 13b of a second pipe 13 arranged on the lower side of the connecting part 14 can be fitted into a connecting end part 13a of the first pipe 13 arranged on the upper side of the connecting part 14. 15, a plurality of connector mounting plate portions (metal plates) 16 projecting outward along the pipe radial direction are provided on the outer peripheral portions of the connecting end portions 13 a and 13 b of the pipes 13. It is integrally provided in a state along the longitudinal direction of the pipe and in a state of being spaced apart in the circumferential direction of each of the connection end portions 13a and 13b, and the connector 17 is connected by bolt connection over the upper and lower connector mounting plate portions 16. The connecting portion 14 is configured to be detachably attached (see FIGS. 8, 9, and 10).
Specifically, the fitting portion 15 is integrated by welding in a state in which a short cylindrical member 18 formed with an inner diameter dimension slightly larger than the outer diameter dimension of the pipe body is fitted to the end portion of the pipe body. The connecting end portion 13b of the second pipe can be fitted into the inner peripheral portion of the short cylindrical member 18. And the above-mentioned connector attachment plate part 16 is being fixed to the outer peripheral part of this short cylinder member 18 by welding. Further, a seal packing 19 is provided on the entire circumference of the fitting portion 15 so as to contact the connecting end portion 13b of the second pipe and seal the seam. On the other hand, as shown in the figure, the connector mounting plate portion 16 is formed of a rectangular metal plate, and a bolt hole 20 for connecting the connector 17 is formed in the center portion thereof. .
On the other hand, the short cylinder member 18 is also fixed to the connection end 13b of the second pipe by welding. However, in the case of the first pipe, a part of the end tube member 18 protrudes from the end of the pipe body, whereas in the case of the second pipe, the fitting portion 15 It is provided at a position where the fitting allowance is shifted. The second pipe part provided with the short cylinder member 18 is referred to as a reinforcing thick part 21.
And the several connector attachment board part 16 is being fixed to the outer peripheral part of this reinforcement thick part 21 by welding similarly to the said 1st pipe. Further, when installing the pipe at a predetermined position or disassembling the stand pipe, the reinforcing thick wall portion 21 is engaged with a hook of a lifting device such as a crane (corresponding to a hanging engagement jig). An engaged plate portion 22 that can be suspended is integrally provided by welding.
Moreover, the said connecting tool 17 is comprised from the metal plate of 2 sheets, and is in the state which clamps what is located in the upper and lower sides among the connecting tool attachment board parts 16 formed in said 1st and 2nd pipe, respectively. It arrange | positions and it has comprised so that both pipes can be connected by bolting.
Accordingly, the second pipe having the lower end fixed is fitted in a state where the fitting part 15 of the first pipe is covered, and the connecting tool 17 is fixed across the connecting tool mounting plate parts 16 positioned above and below. It becomes possible to connect both pipes.
[0021]
According to the structure of the connecting part, it is possible to easily form the structure of the connecting part, so that the processing cost can be reduced, and bending caused by vibration or impact generated by excavation by the auger Even if the force acts on the standpipe, the pipe mounting plate 16 is provided in a mechanically advantageous direction, and the effective section of the member at the fitting part 15 and the reinforcing thick part 21 is increased. It becomes possible to maintain the sealing part in a state where the sealing parts are kept in a sealed state, and it is possible to configure a connecting part having a high sealing property.
[0022]
[Another embodiment]
Other embodiments will be described below.
[0023]
<1> The positional relationship between the first pipe and the second pipe is the opposite, in addition to the first pipe being the upper position and the second pipe being the lower position, as described in the previous embodiment. The second pipe may be in the upper position and the first pipe may be in the lower position.
<2> The connector 17 is not limited to the configuration of the pair of metal plates described in the previous embodiment, and may be a single metal plate, for example.
Furthermore, as shown in FIG. 11, it may be configured so that both the upper and lower coupling attachment plate portions can be pulled and operated. In this case, both pipes are fitted and arranged. By attaching the connector to each connector mounting plate portion and performing a proximity operation, the fitting force of both pipes increases, and it becomes possible to configure a connection portion with higher sealing performance.
[Brief description of the drawings]
1 is a cross-sectional view illustrating an existing building. FIG. 2 is a cross-sectional view illustrating a method of rebuilding a building. FIG. 3 is a cross-sectional view illustrating a method of rebuilding a building. Sectional view to explain [FIG. 5] Cross-sectional view to explain how to rebuild the building [FIG. 6] Cross-sectional view to explain how to rebuild the building [FIG. 7] Conceptual diagram showing the location of the existing building [FIG. FIG. 9 is an exploded perspective view showing the connecting portion. FIG. 10 is a sectional view showing the connecting portion. FIG. 11 is a sectional view showing the connecting portion according to another embodiment. Sectional view showing [signs]
13 Pipe 13a Connection end part 13b Connection end part 14 Connection part 15 Fitting part 16 Connection tool attachment plate part 17 Connection tool 21 Reinforcement thick part 22 Engagement plate part K1 Ground excavation tool

Claims (3)

A plurality of pipes through which a pile-forming ground excavator can be inserted into the inner space, and a pipe for standing piles connected in the pipe axis direction via a connecting part,
The connecting portion is configured so that the connecting end portion of the first pipe disposed on one side of the connecting portion can be fitted into the connecting end portion of the second pipe disposed on the other side of the connecting portion. A seal packing is provided on the inner periphery of the fitting portion so as to be in contact with the connection end of the second pipe and seal the seam over the entire periphery. A plurality of connector mounting plate portions projecting outward along the pipe radial direction are arranged on the outer peripheral portion of the portion in a state where the plate surface is along the pipe longitudinal direction and spaced in the circumferential direction of each of the connection end portions. A pile that is integrally provided in a state where the connector is opened, and the connector is detachably mounted across the two connector mounting plate portions , and the connector is configured so that both connector mounting plate portions can be pulled and operated freely. Standing pipe for forming.   The pile forming device according to claim 1, wherein a reinforcing thick part formed thick in the circumferential direction is provided at a connection end of the second pipe, and the connector mounting plate part is formed in the reinforcing thick part. Standing pipe.   The pile forming upright pipe according to claim 2, wherein an engaged plate portion that can be suspended is formed on an outer peripheral portion of the reinforcing thick wall portion by engaging a suspension engaging jig of a lifting device. .

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