JP3809467B2 - Ground anchor construction and grout material discharge device using trumpet pipe and method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ground anchor method using a trumpet tube, a grout material discharging apparatus, and a method thereof.
[0002]
[Prior art]
Ground anchor method is a method used to prevent unstable collapse or peeling by bonding unstable ground or rock directly to stable ground or rock, and drilling holes in the base to inject cement mortar etc. The anchor body is formed by the following three basic elements.
"Anchor head": A part that allows force from the structure to be transmitted to the tension part as a tension force.
"Tensile part": A part that transmits the tensile force to the anchor body in the base.
"Anchor body": A part that transmits the tensile force from the tension part to the base and resists it.
[0003]
As shown in FIG. 15, the general construction method of the ground anchor method is to insert the casing pipe 2 into a drilled hole drilled to a depth reaching the base, for example, with a rotary percussion drilling machine [FIG. 15 (a)]. . Then, the grout material G is filled into the casing pipe 2 and the tendon 4 (tensile material) is inserted through the casing pipe 2 as shown in FIG. Next, the grout material G is injected under pressure while the casing pipe 2 is pulled out as shown in FIG. The unstable layer is reinforced by tensioning the tension portion between the anchor body 3 formed in the stable layer in this way and the structure provided on the ground surface [(e)].
[0004]
The main feature of the ground anchor work is a tightening function that presses and stabilizes the slope where there is a risk of slipping by prestressing the tension part. The tensile strength of the tensile part is used to prevent the landslide mass from trying to slide, but unlike the pile work, by applying a certain amount of prestress to the tensile part at an early stage, the elongation of the tensile part ( There is an initial detent function that can increase the deterrent effect when the amount of deformation due to landslide is small. In addition, there is a sewing function in which the anchor body is formed across the sliding surface and the strength of the sliding surface is increased by the tensile strength of the tensile portion.
[0005]
[Problems to be solved by the invention]
As described above, it goes without saying that the most expected effect in adopting the ground anchor method as the slope reinforcing work is that a prestress is applied to the tension portion. However, in the conventional ground anchor construction, the prestress, which is the greatest feature, is hardly structurally applied.
[0006]
This is because the portion of the unstable layer to be compressed is continuously integrated with the anchor body by the injection of the grout material. Such a phenomenon occurs in the casing pressure injection method. Prestress applied to the anchor head is applied to the grout material that has penetrated to the portion to be compressed, and the unstable layer is not damaged unless the grout material in this portion is broken. No compression zone will occur. Even if the grout material breaks, the compression is limited to the fracture locality, and unless the tensile property of the grout material is lost throughout the unstable layer, the substantial function of the ground anchor construction cannot be fully exhibited. .
[0007]
[Means for Solving the Problems]
Accordingly, the present inventor has achieved the present invention as a result of intensive studies in view of the above problems, and the feature of the present inventor is that in the ground anchor work, the grout material is press-fitted into the casing pipe and anchored in the base. After the body part is formed, a trumpet pipe formed by a pipe part having a gap with the tensile material and a diameter-enlarging part provided at the tip part of the pipe part and communicating with the pipe part is inserted into the casing pipe. Then, after the grout material between the casing pipe and the trumpet pipe is discharged through the pipe portion of the trumpet pipe, the grout material discharge portion from the pipe portion is sealed. (First invention)
[0008]
Or, in ground anchor work, after the grout material is press-fitted into the casing pipe to form the anchor body part in the base, it is provided at the diameter of the pipe part having a gap between the tensile material and the tip part of the pipe part. A trumpet pipe constituted by an enlarged diameter portion communicating with the casing pipe is inserted into the casing pipe, and the grout material between the casing pipe and the trumpet pipe is discharged through the pipe section of the trumpet pipe, It is to feed water into the casing pipe. (Second invention)
[0009]
Alternatively, in the ground anchor work, after the grout material is press-fitted into the casing pipe to form the anchor body part in the base, the pipe part having a gap between the tensile material and the tip part of the pipe part is provided. By passing the trumpet pipe constituted by the enlarged diameter part communicating with this through the tension material head moved to the lifted state in the casing pipe via the auxiliary tool, and inserting it into the casing pipe, The grout material between the casing pipe and the trumpet pipe is discharged through the pipe portion of the trumpet pipe. (Third invention)
[0010]
Or, in ground anchor work, after the grout material is press-fitted into the casing pipe to form the anchor body part in the base, it is provided at the diameter of the pipe part having a gap between the tensile material and the tip part of the pipe part. A trumpet tube constituted by a diameter-expanded portion that communicates with the casing pipe, partially inserted into the casing pipe, a fixing member attached to the casing pipe, and a pushing member attached to the pipe portion of the trumpet tube, A grout material between the casing pipe and the trumpet pipe is provided by bridging the actuating body and reducing the distance between the fixing member and the pushing member by the actuating body to push the trumpet pipe into the casing pipe. Is to be discharged through the pipe portion of the trumpet tube. (Fourth invention)
[0011]
Alternatively, in the ground anchor work, after the grout material is press-fitted into the casing pipe and the anchor body portion is formed in the base, a part of the grout material in the casing pipe is discharged to the outside for the purpose of discharging the tensile material and An apparatus for inserting a trumpet pipe formed by a pipe portion having a gap between the pipe portion and an enlarged diameter portion provided at a tip portion of the pipe portion and communicating with the pipe portion into the casing pipe, the casing pipe And a pressing member attached to the pipe portion of the trumpet tube, and an operating body that spans between the fixing member and the pressing member and reduces the distance between the fixing member and the pressing member. (Fifth invention)
[0012]
Here, the “anchor body” in the present specification means that a casing pipe is inserted into a hole drilled by a drilling machine from the ground surface to a depth from the stable base to cement milk or cement mortar in the casing pipe. It refers to a lump formed in the base by press-fitting grout material. There are various hole drilling machines, for example, a rotary percussion type and a down-the-hole hammer type. In the rotary percussion type, the anchor body is formed by press-fitting the grout material while pulling out the casing pipe, but in the down-the-hole hammer type, the anchor forming portion is drilled in a series of processes, and the anchor body is not pulled out. It is formed. In the present invention, since the grout material up to the anchor body is removed by inserting the trumpet pipe through the casing pipe, the anchor body portion may have the same diameter as the casing pipe.
[0013]
“Tensile material” refers to a steel material that is prestressed by embedding one end in an anchor body and pulling the other end from the ground surface side. Generally, a PC steel strand, a PC steel composite wire bundle, a PC steel rod, or the like is used. Usually, a tensile material is covered with a sheath and a rust preventive material such as grease is enclosed inside. Generally, an apartment or a fixed body is called a tendon.
[0014]
“Trumper pipe” refers to a member for discharging a part of the grout material filled in the casing pipe to the outside. This is because the grout material is pressurized and injected into the casing pipe to form the anchor body part, and then the trumpet pipe is inserted into the casing pipe, so that the grout material is brought outside through the inside of the pipe part from the enlarged diameter part. It is for discharging and ensuring that the tensile force of the anchor head is transmitted to the anchor body. The insertion length of the trumpet tube is basically up to the anchor body. That is, the grout material between the casing pipe and the trumpet tube is removed, and the anchor body injection grout material is basically prevented from flowing out to the free length portion.
[0015]
The greatest object of the present invention is to prevent the portion to be compressed of the unstable layer from being continuously integrated with the anchor body by the injection of the grout material, thereby preventing the compression zone from being generated in the unstable layer. For this reason, the trumpet tube is inserted to such an extent that the compression zone is generated in the unstable layer (the length that does not reach the anchor body), and a part of the grout material between the casing pipe and the trumpet tube (the axial direction of the free length portion) It is also possible to remove only a part of
[0016]
The trumpet tube is constituted by a pipe portion and a diameter-expanded portion provided at and communicated with the pipe portion. The pipe portion is a portion that fits into the tensile material, and the grout material is discharged through the pipe portion. For this reason, let the internal diameter of a pipe part be a diameter which produces a clearance gap between tensile materials. The material is not particularly limited, but it is preferable to reduce the weight with a plastic such as aluminum or polyvinyl chloride.
[0017]
The enlarged diameter portion is provided at the tip of the pipe portion to introduce the grout material in the casing pipe into the pipe portion, and has a truncated cone shape or a bowl shape. The material is made of a soft material such as rubber, leather, synthetic rubber, or synthetic leather, and is made to follow the inner peripheral surface of the casing pipe. It is preferable to remove even the grout material on the inner peripheral surface portion of the casing pipe at the enlarged diameter portion, but even if it remains to some extent, it may be easily broken when the tension material is tightened or removed when the casing pipe is pulled out. Accordingly, the diameter of the casing pipe may be a diameter where a gap is generated, and even when formed of a hard member such as metal or plastic, most of the grout material that hinders the tension of the anchor body can be removed.
[0018]
It is preferable to provide a guide member on the distal end side of the enlarged diameter portion. This is because if there is a portion with a different diameter such as a coupling in the casing pipe, the enlarged diameter portion may be caught and cannot be inserted further. As the guide member, pin-shaped members such as metal and plastic are provided at appropriate intervals. In this case, the guide member is provided so as to be inclined inward so as not to be caught by the different diameter portion, or the tip portion is bent inward.
[0019]
The trumpet tube may be pulled out after the grout material has been removed. However, if the trumpet tube is left in the inserted state, an effect such as contributing to rust prevention of the tensile material is produced. When leaving the trumpet tube, the pipe portion of the trumpet tube usually protrudes from the tensile material. For this reason, after pulling out the casing pipe, the pipe portion is cut to expose the head portion of the tensile material. Moreover, you may make it remove a joint part, without cut | disconnecting by making a pipe part into a joint structure.
[0020]
The “grouting material discharge portion” refers to a portion where the grout material between the casing pipe and the trumpet tube is discharged by inserting the trumpet tube. After the trumpet tube is inserted and the grout material is discharged, the grout material remains between the pipe portion of the trumpet tube and the tensile material. In this case, by leaving the grout material between the pipe part of the trumpet pipe and the tensile material, the tensile material can be protected more reliably, so the grout material discharge part is sealed after the completion of the insertion of the trumpet pipe, Air is prevented from flowing into the section so that the remaining grout material does not flow out.
[0021]
The grout material discharge part usually refers to the pipe part end of the trumpet pipe, and is sealed by a method such as covering with a cap, plugging, or crushing the end with a tool. In this case, since the head portion of the tensile material is present inside the pipe portion, the pipe portion is cut after curing to expose the head portion of the tensile material. In addition, a separate hose or pipe may be provided at the end of the pipe to allow the grout material to be discharged. In this case, the discharge part is sealed or removed after discharging to remove the pipe part. You may seal the edge part. When discharging a grout material by connecting a separate hose or pipe to the pipe section, it is possible to discharge the grout material to the outside even with a short trumpet tube. Can be exposed.
[0022]
“Water supply” refers to feeding water into the casing pipe in order to remove the grout material that has permeated between the casing and the ground by pressurizing the grout material into the casing pipe. The purpose of this is to increase the effect of prestress applied to the tension portion together with the discharge of the grout material by the trumpet tube by washing away the grout material present in the holed wall portion. The water supply is usually performed when the casing pipe is pulled out after the grout material is discharged by the trumpet pipe, and the casing pipe can be easily pulled out.
[0023]
Pulling out the casing pipe is generally performed while rotating. However, the diameter of the trumpet pipe may be damaged by the bit provided at the tip of the casing pipe, or the tendon may be damaged due to co-rotation. About 10 cm to 50 cm is preferably pulled out without rotating. The diameter-enlarged portion has a water shielding effect when water is supplied, and has a function of protecting the anchor body and protecting the connecting portion between the fixing body and the tension portion provided on the tendon, and is preferably not damaged as much as possible. .
[0024]
The “auxiliary tool” refers to a member for moving the tension material head in the casing pipe to a lifted state. This is because, in most cases, the tensile material existing inside the casing pipe is in a state in which the head is in contact with the inner peripheral surface of the casing pipe, and the trumpet pipe interferes with this and cannot be inserted. It is for preventing. The difficulty in inserting the trumpet tube is due to the fact that the guide member is provided in the enlarged diameter portion as described above. However, even when the guide member is not provided, the trumpet tube can be inserted by using an auxiliary tool. Can be made easier.
[0025]
As an auxiliary tool, a pipe-shaped object is passed from the outside of the casing pipe to the head of the tensile material, and in this state, the trumpet pipe is passed from the auxiliary tool to the tensile material. In this case, it is possible to easily pick up the tensile material head by forming the tip of the auxiliary tool in a tapered shape or in a trumpet shape like the enlarged diameter portion of the trumpet tube. Moreover, you may provide the auxiliary tool in advance in the tension | tensile_strength material head. In this case, a conical shape, a pyramidal shape, or a shape warped in one direction is used to make it easy to enter the enlarged portion of the trumpet tube.
[0026]
The “fixing member” is a member attached to the casing pipe, and the “pushing member” is a member attached to the trumpet pipe. The fixing member and the pushing member are used as a set. By attaching them to each other and bringing the pushing member close to the fixing member, the trumpet tube is pushed into the casing pipe and the grout material is discharged. As these attachment methods, it is performed by screwing, engagement by a protrusion, tightening, or the like. In the case of the pushing member, it may be simply put on the end of the pipe portion, or may be structured to be supported by friction. When the pushing member is put on the end portion of the pipe portion, a grout material discharge portion such as a hole or a gap is provided so as not to hinder the discharge of the grout material from the pipe portion. Moreover, you may enable it to utilize a pushing member as a sealing member of the pipe part mentioned above.
[0027]
As a method of exposing the tendon inside the trumpet tube, a pushing member attached to the trumpet tube may function as a part of the trumpet tube. In other words, the trumpet tube has a length that does not need to be cut when the insertion is completed (the length that exposes the tendon so that the head can be processed), and the grout material is discharged through the pushing member until the insertion is completed. It is. This is the same as the joint structure described above. In this case, the pushing member is provided at the end of the pipe portion as described above, and the grout material is caused to flow from the pipe portion into the pushing member and discharged. The pushing member needs to have a predetermined length (a length that protrudes from the casing pipe until the trumpet tube is completely inserted), but the length may be secured by interposing a separate spacer or the like. Good. After curing, the tendon head can be exposed by simply removing the pushing member (and spacer).
[0028]
The “actuating body” is a member that spans between a fixing member attached to the casing pipe and a pressing member attached to the trumpet pipe, and refers to a member that reduces the distance between the fixing member and the pressing member. For example, a linear body such as a rope or a wire is bridged between the fixing member and the pushing member as an operating body, and the trumpet pipe is pushed in by pulling it. The operating body may be a driving body such as an air cylinder, or a mechanism such as a screw mechanism or a rack and pinion.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments of the invention shown in the drawings.
[0030]
An example of an embodiment of ground anchor work using a trumpet pipe is shown in FIG. First, a hole for inserting the casing pipe 2 and a hole for forming the anchor body 3 are drilled by a down-the-hole hammer type drilling machine as shown in (a), and the casing pipe 2 and tendon (tensile material) as shown in (b). ) 4 is inserted. Next, the grout material G is pressurized and injected into the casing pipe 2 as shown in FIG. The steps up to here are the same as those of the conventional ground anchor method.
[0031]
When the anchor body 3 is formed, the trumpet pipe 1 is pushed into the casing pipe 2 as shown in (d). By inserting the trumpet pipe 1, the grout material G in the casing pipe 2 is discharged to the outside through the pipe portion 11 of the trumpet pipe 1. After discharging the grout material G, the casing pipe 2 is completely pulled out (e), tensioned (f), and fixed (g) in the same manner as a general ground anchor.
[0032]
An example of the embodiment of the trumpet tube 1 is shown in FIG. The trumpet tube 1 is composed of a pipe portion 11 and an enlarged diameter portion 12 as shown in FIG. 1A, and the distal end portion of the enlarged diameter portion 12 is bent inward as shown in FIG. A plurality of guide members 13 are provided. In this example, an example is shown in which a trumpet tube stopper sheath 14 for processing the head of the trumpet tube 1 inserted is attached. FIG. 2C shows a state in which the trumpet pipe 1 is pushed into the casing pipe 2, and the grout material G that has been stirred by the enlarged diameter portion 12 is discharged through a gap with the tendon 4 inside the pipe portion 11. Indicates the state. Moreover, even when there is a different diameter portion due to the presence of the coupling 21 in the casing pipe 2 as in this example, the enlarged diameter portion 12 can be deformed and pushed in by the guide member 13 as shown by a chain line in the figure.
[0033]
As shown in FIG. 3, the anchor structure constructed by the ground anchor construction using the trumpet pipe has no free length part that inhibits compression by tendon 4, and the tensile force from the tension part is applied to the anchor body 3. It can be transmitted reliably, and secondary tension can be effectively performed.
[0034]
FIG. 4 shows an example of an embodiment of the ground anchor construction using the trumpet pipe according to the first invention of the present invention, and the grout material at the time when the insertion of the trumpet pipe 1 is completed [FIG. 1 (d)]. A cap 16 is put on the end of the pipe portion which is the discharge portion 15 and sealed. By sealing the grout material discharge portion 15, the grout material G in the trumpet pipe 1 is prevented from flowing out, so that this portion of the grout material G can act as a protective material for the tendon 4. In this case, since the head of the tendon 4 exists inside the pipe portion 11 as shown in the figure, the head of the tendon 4 is exposed by cutting the pipe portion 11 as shown in FIG. This operation is performed after the grouting material G is cured after the casing pipe 2 is pulled out.
[0035]
The casing pipe 2 is pulled out after the grout material is discharged by the trumpet pipe 1 [FIG. 1 (e)]. In this case, as shown in an example of the embodiment of the ground anchor construction using the trumpet pipe according to the second invention of the present invention in FIG. 6, the casing pipe 2 for the purpose of removing the grout material G adhering to the drilling wall Water in. A small amount of water may be supplied and may be started either before or after the casing pipe 2 is pulled out. The casing pipe 2 is normally pulled out while being rotated, but may be pulled out without being rotated.
[0036]
Since the water supply is intended to remove the grout material from the drilled wall, as in another example of the embodiment of the ground anchor construction using the trumpet pipe according to the second invention of the present invention shown in FIG. It is effective to start after pulling out the casing pipe 2 by about 10 cm to 50 cm. In this example, when the casing pipe 2 is pulled out, the casing pipe 2 and the diameter-expanded portion 12 are pulled out without rotation until the casing pipe 2 and the enlarged diameter portion 12 do not interfere with each other, and the trumpet pipe 1 is prevented from being rotated and damaged as described above. Then, as shown in FIG. 5B, water supply is started and the casing pipe 2 is rotated and pulled out.
[0037]
After the head of the tendon 4 is exposed by a method such as cutting the pipe portion 11 as shown in FIG. 5, the tendon head is processed such as attaching the pressure receiving plate 6 and the bearing plate 7 as shown in FIG. Thereafter, as shown in FIGS. 1 (f) and 1 (g), tension and fixation are performed, and inspection confirmation such as the settlement of the pressure receiving plate 7 is performed. In this example, an example is shown in which an injection pipe 5 for injecting mortars is inserted into a gap formed between the trumpet pipe 1 and the drilling wall by inserting the trumpet pipe 1. The injection pipe 5 may be inserted any time after the casing pipe 2 is pulled out. The injection of the mortars by the injection pipe 5 is performed after the inspection confirmation or when re-tensioning is necessary. After the injection of mortars, the injection pipe 5 is cut or pulled out to complete the operation.
[0038]
In the ground anchor work using the trumpet pipe, when the trumpet pipe 1 is inserted into the casing pipe 2, the pipe portion 11 must be passed through the tendon 4. In this case, if the end of the tendon 4 is inside the casing pipe 2, the guide member 13 provided in the enlarged diameter portion 12 may interfere with the tendon head and cannot be inserted. For this reason, as shown in FIG. 9A which is an example of the embodiment of the grout material discharging method according to the third aspect of the present invention, first, the auxiliary tool 8 is inserted into the tendon head. Then, the trumpet tube 1 can be inserted into the tendon 4 simply and reliably as shown in FIG.
[0039]
After the trumpet tube 1 can be inserted into the tendon 4, the auxiliary tool 8 is pulled out and the trumpet tube 1 is continuously inserted. In this case, it is necessary to make the auxiliary tool 8 protrude from the trumpet tube 1 as shown in the drawing when the trumpet tube 1 is inserted into the tendon 4. However, even if it is short, the auxiliary tool 8 is pushed out by the discharge of the grout material G by the insertion of the trumpet tube 1 and can be taken out. The auxiliary tool 8 may be simply a pipe as shown in FIG. Further, as the auxiliary tool 8, in addition to the one inserted from the outside of the casing pipe 2 when the trumpet tube 1 is inserted, a shape provided with a guide 81 for entering the enlarged diameter portion 12 of the trumpet tube 1 as shown in FIGS. And this may be put on the head of the tendon in advance.
[0040]
FIG. 11 shows an example of an embodiment of the grout material discharge device 30 according to the fifth invention of the present invention, and a fixing member 31 fixed to the end of the casing pipe 2 press-fitted into the ground by screwing, A pushing member 32 that covers the end of the pipe portion 11 of the trumpet tube 1, and an operating body that moves the pushing member 32 relative to the fixing member 31 by spanning and pulling the fixing member 31 and the pushing member 32. The rope is 33. In this example, an example in which the trumpet pipe 1 is pushed by pulling the rope with the installed winch 34 is shown. And in order to make tension | pulling of a rope smooth, the pulley 35 is provided in the fixing member 31 and the pushing member 32. FIG. Instead of the pulley 35, a guide groove that is curved so as to be slippery may be provided.
[0041]
FIG. 12A shows another example of the embodiment of the fixing member 31, in which a hook locking portion 312 is provided on one side of the cylindrical body 311 and a pulley 35 is provided on the other side. And it is the structure which provided the opening-and-closing member 313 for making it easy to attach a rope to this pulley 35, and making it hard to remove | deviate at the time of tension | pulling. The cylindrical body 311 has a screw engraved on its inner peripheral surface, and is fixed by screwing into a screw engraved on the outer peripheral surface of the casing pipe 2. FIG. 7B shows another example of the embodiment of the pushing member 32, and since the structure covers the pipe portion 11 of the trumpet tube 1, a plurality of grout material discharge portions 15 are provided on the crown portion 321. A hole is provided so that the grout material G fed out through the pipe portion 11 flows out to the outside.
[0042]
In the ground anchor work using the trumpet pipe, after the trumpet pipe 1 is inserted, the head portion of the tendon 4 is usually exposed by cutting the pipe portion 11. However, in the grout material discharge method according to the fourth invention of the present invention and the grout material discharge device 30 according to the fifth invention, since the pushing member 32 is mounted on the pipe part 11, the cutting process of the pipe part 11 is performed. It can be omitted. In this case, a trumpet tube 1 having a length that does not need to be cut as shown in FIG. 13 is used. Then, when the trumpet tube 1 is inserted at a predetermined depth, the casing pipe 2 or the fixing member 31 attached to the casing pipe 2 is pushed at a position almost the same as the fixing member 31 as shown in the figure. The member 32 is used. Thereby, the head of tendon 4 can be exposed only by removing pushing member 32 from pipe part 11 after insertion of trumpet pipe 1 is completed. Moreover, if the grout material discharge | release part 15 of the pushing member 32 is sealed after completion of insertion of the trumpet tube 1, the outflow of the grout material G inside the pipe part 11 can be prevented and cured. When the pushing member 32 is later removed, the tendon head is exposed.
[0043]
FIG. 14 shows another example of the embodiment of the grout material discharging apparatus 30 according to the fifth aspect of the present invention, in which a gripping tool using friction is used as the pushing member 32. This can be easily mounted simply by fitting from the side of the pipe portion 11. And it can also push in intermittently by repeating pushing and a movement of an attachment position.
[0044]
【The invention's effect】
As described above, the ground anchor work using the trumpet pipe according to the first invention of the present invention discharges the grout material with the trumpet pipe, and then seals the grout material discharge portion to thereby remove the grout material in the pipe portion. Outflow can be prevented, and the grout material can be used for protection of tendon as a protective material.
[0045]
In the ground anchor construction using the trumpet pipe according to the second aspect of the present invention, the grout material is discharged from the trumpet pipe and then fed into the casing pipe to remove the grout material at the holed wall portion. The effect of the prestress applied to the pulling portion by using the pipe can be further increased, and the casing pipe can be easily pulled out.
[0046]
The ground anchor construction using the trumpet pipe according to the third aspect of the present invention uses the auxiliary tool for moving the tension material head in the casing pipe to the lifted state, thereby inserting the trumpet pipe into the casing pipe. Can be easily and reliably produced, leading to an improvement in work efficiency.
[0047]
The grout material discharging method according to the fourth aspect of the present invention and the grout material discharging apparatus according to the fifth aspect of the present invention can reduce labor associated with the insertion of the trumpet pipe into the casing pipe, and provide a ground anchor construction using the trumpet pipe. It can be carried out efficiently. Further, the pushing member can be used as a sealing member for the grout material discharge portion of the first invention, and the step of cutting the pipe portion after inserting the trumpet tube can be omitted.
[Brief description of the drawings]
FIGS. 1A to 1G are schematic side views showing an example of an embodiment of a ground anchor construction using a trumpet pipe.
FIGS. 2A and 2B show an example of an embodiment of a trumpet tube used in the present invention. FIG. 2A is a longitudinal sectional view, FIG. 2B is a perspective view of an enlarged diameter portion, and FIG. It is a schematic sectional drawing which shows an example.
FIG. 3 is a schematic cross-sectional view showing an example of an embodiment of an anchor structure of a ground anchor construction through which a trumpet pipe is inserted.
FIG. 4 is a schematic cross-sectional view showing an example of an embodiment of a ground anchor construction using a trumpet pipe according to the first invention of the present invention.
FIG. 5 is a schematic cross-sectional view showing a state where a pipe portion of a trumpet pipe is cut to expose a tendon head.
FIG. 6 is a schematic sectional view showing an example of a ground anchor construction using a trumpet pipe according to the second invention of the present invention.
FIGS. 7A and 7B are schematic cross-sectional views showing other examples of the ground anchor construction using the trumpet pipe according to the second invention of the present invention, respectively.
FIG. 8 is a schematic cross-sectional view showing an example of a tendon head processing embodiment.
FIGS. 9A and 9B are schematic cross-sectional views showing an example of an embodiment of the grout material discharging method according to the third invention of the present invention, respectively, and FIG. 9C is another example of the embodiment of the auxiliary tool. It is a fragmentary sectional view shown.
FIGS. 10A and 10B are cross-sectional views showing still other examples of the embodiment of the assisting device, respectively. FIGS.
FIG. 11 is a schematic sectional view showing an example of the embodiment of the grout material discharging apparatus according to the fifth aspect of the present invention.
12 (a) is a plan view showing another example of the embodiment of the fixing member in the grout material discharging apparatus according to the fifth invention of the present invention, and FIG. 12 (b) is a side view showing a part thereof; FIG. It is the top view and side view which show other examples.
FIG. 13 is a schematic side view showing still another example of the embodiment of the grout material discharging apparatus according to the fifth invention of the present invention.
FIG. 14 is a schematic side view showing still another example of the embodiment of the grout material discharging apparatus according to the fifth aspect of the present invention.
FIGS. 15A to 15E are schematic sectional views showing an example of a conventional ground anchor method.
[Explanation of symbols]
G Grout material 1 Trumpet tube 11 Pipe portion 12 Expanded portion 13 Guide member 14 Trumpet tube stopper sheath 15 Grout material discharge portion 16 Cap 17 Holder 2 Casing pipe 21 Coupling 3 Anchor body 4 Tendon 5 Injection pipe 6 Pressure receiving plate 7 Pressure bearing plate 8 Auxiliary tool 81 Guide 30 Grout material discharging device 31 Fixing member 311 Cylindrical body 312 Hook locking portion 313 Opening and closing member 32 Pushing member 321 Crowning portion 33 Actuator 34 Winch 35 Pulley

Claims (12)

In ground anchor work, after grout material is press-fitted into the casing pipe to form the anchor body part in the base, it is provided at the pipe part with a diameter having a gap between the tensile material and the tip part of the pipe part and communicates with this A trumpet pipe formed by the expanded diameter portion is inserted into the casing pipe, and after the grout material between the casing pipe and the trumpet pipe is discharged through the pipe section of the trumpet pipe, the pipe section Ground anchor construction using a trumpet pipe, which is characterized by sealing the grout material discharge part. The ground anchor construction using the trumpet pipe according to claim 1, wherein after sealing the grout material discharge section, the casing pipe is pulled out and the pipe section of the trumpet pipe is cut to expose the head portion of the tensile material. In ground anchor work, after grout material is press-fitted into the casing pipe to form the anchor body part in the base, it is provided at the pipe part with a diameter having a gap between the tensile material and the tip part of the pipe part and communicates with this A trumpet pipe formed by the expanded diameter portion is inserted into the casing pipe, and after the grout material between the casing pipe and the trumpet pipe is discharged through the pipe section of the trumpet pipe, the casing pipe Ground anchor construction using a trumpet pipe that is characterized by feeding water inside. The ground anchor construction using the trumpet pipe according to claim 3, wherein after the grout material is discharged through the pipe portion of the trumpet pipe, the casing pipe is pulled out by about 10 cm to 50 cm and then fed into the casing pipe. In ground anchor work, after grout material is press-fitted into the casing pipe to form an anchor body part in the base, it is provided at the pipe part with a diameter having a gap between the tensile material and the tip part of the pipe part. By passing a trumpet pipe constituted by the expanded diameter part communicating with the tension material head moved to the lifted state in the casing pipe via an auxiliary tool, and inserting the trumpet pipe into the casing pipe, A grout material discharging method, wherein a grout material between a pipe and the trumpet pipe is discharged through a pipe portion of the trumpet pipe. 6. The grout material discharging method according to claim 5, wherein the auxiliary tool is one in which the grout material is press-fitted into the casing pipe to form an anchor body portion in the base, and then passed through the tension material head from the outside of the casing pipe. 6. The grout material discharging method according to claim 5, wherein the auxiliary tool is provided on the tension material head and is provided with a guide that enters the enlarged portion of the trumpet tube. In ground anchor work, after grout material is press-fitted into the casing pipe to form the anchor body part in the base, it is provided at the pipe part with a diameter having a gap between the tensile material and the tip part of the pipe part and communicates with this A trumpet pipe formed by the enlarged diameter portion is partially inserted into the casing pipe, a fixing member attached to the casing pipe, and a pushing member attached to the pipe portion of the trumpet pipe, The truncation pipe is pushed into the casing pipe by reducing the distance between the fixing member and the pushing member with the operating body, and a grout material between the casing pipe and the trumpet pipe is provided. A grout material discharging method, wherein the grout material is discharged through a pipe portion of the trumpet tube. In ground anchor work, after the grout material is press-fitted into the casing pipe and the anchor body is formed in the base, a part of the grout material in the casing pipe is discharged to the outside for the purpose of discharging to the outside. An apparatus for inserting a trumpet pipe formed by a pipe part having a gap in the diameter and an enlarged diameter part provided at a tip part of the pipe part and communicating with the pipe part into the casing pipe, and attached to the casing pipe A grout material comprising: a fixing member; a pressing member attached to a pipe portion of a trumpet tube; and an operating body that spans between the fixing member and the pressing member and reduces a distance between the fixing member and the pressing member. Discharging device. The grout material discharge device according to claim 9, wherein the operating body is a linear body that is stretched across the fixing member and the pushing member. The grout material discharge device according to claim 9 or 10, wherein the pushing member is provided with a grout material discharge portion. The trumpet tube has a length that the inside of the casing pipe protrudes from the casing pipe when the insertion is completed, and the pushing member projects at substantially the same position or more as the end of the casing pipe when the trumpet tube insertion is completed. The grout material discharging device according to claim 9, which is a length.

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