JPH0517940A - Method and device for pressure curing hardening material in anchor preparation - Google Patents

Abstract

PURPOSE:To prevent an inflow of groundwater into an anchor hole by curing a surface of an anchor execution position by using a pressure curing machine raised from a cover member and the anchor hole and removably mounted on a cover part. CONSTITUTION:A pressure curing machine 23 is constituted of a cover member formed of a cylindrical pipe 25 and a tapered pipe 39, packing member 33, rise up pipe 38 for injecting a setting agent supplemented, tension material 41 and a seal member 45 for sealing a tension material insertion port, and this machine 23 is set up in an execution position of an anchor hole 21. The anchor 41 is inserted from the tension material insertion port 41 and sealed with the seal member 45 to also fill the anchor hole 21 and the cover member with the hardening material from the rise up pipe 38, thereafter to perform curing by a pressure head in accordance with height and specific gravity before hardening of the rise up pipe 38. In this way, an inflow of groundwater by collapse of the anchor hole 21 and dilution and dispersion of the hardening material can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure curing method for a hardening material in forming an anchor and a pressure curing apparatus used for carrying out the method.

[0002]

2. Description of the Related Art In order to prevent a building from tipping over due to an earthquake or rising due to water pressure, conventionally, as shown in FIG. Is fixed to the ground 5 to stabilize the entire building.

[0003] In general, the anchor is constructed after the excavation (root cutting) for constructing the underground part of the building is completed.
Although excavation is performed from the root excavation floor, a wall is formed using steel sheet pile to surround the excavation area, and a well is provided in this excavation area to pump the groundwater and the water level It is carried out by lowering the groundwater level below the root cutting floor by a method of lowering the groundwater level such as forcibly lowering the groundwater level.

After the excavation of the underground portion, waste concrete (hereinafter referred to as "disposable concrete") is struck on the root cutting floor, an anchor hole is drilled in the ground by a drilling machine, and then a PC steel wire or the like is pulled. A material is inserted and a hardening material is injected to form an anchor body. After the anchor body is hardened, the hardening material is secondarily injected into the anchor hole again to form the anchor in the ground.

[0005]

However, in the method of constructing an anchor as described above, as shown in FIG. 10, the anchoring portion for anchoring the anchor body 7 to the ground is usually a building foundation 9
Since it is installed with a certain length (free length part) L,
In many cases, the anchor body 7 was located on the ground (hereinafter referred to as “fixed ground”) 13 below the tip of the wall body 11.
In this situation, if the fixed ground 13 is a permeable ground such as a gravel layer or a conglomerate layer, the fixed ground 13 is the wall 1
Since it directly communicates with the outside of the wall body 1, the water having the same pressure as that of the outside of the wall body 11 flows into the anchor hole due to the head difference from the natural groundwater level outside the wall body 11.

Cement milk is generally used as a hardening material for fixing the anchor body 7 to the fixing ground 13, and the specific gravity of the cement milk is normally used to suppress the inflow of water into the anchor hole. However, when the difference between the water level in the excavation area and the natural groundwater level outside the wall 11 is too large, the situation in which pressure water flows into the anchor hole occurs as described above.

When the pressure water thus flows into the anchor hole, the cement milk is diluted or outflowed by the inflow water until the cement milk hardens, so that a predetermined yield strength of the anchor can be obtained. There was a risk of disappearing.

The present invention has been devised in view of such circumstances, and a wall body is provided so as to surround the excavation area, and the groundwater level in the excavation area is lowered by the groundwater level lowering method to perform excavation. After the anchor is created, the method of pressure curing the hardening material in the anchor creation that prevents the inflow of groundwater into the anchor hole to prevent the hardening material from diluting and flowing out, and the method used for its implementation. An object is to provide a pressure curing device.

[0009]

In order to achieve such an object, the method of pressure hardening a hardening material according to the present invention is to provide a wall body so as to surround the excavation area, and set the groundwater level of the excavation area to the groundwater level. After excavating by lowering the floor to below the root cutting floor,
Abandoned concrete is thrown into the root cutting floor, an anchor hole is drilled in the ground with a hole drilling machine, a tension material is inserted into this anchor hole, and then a tension material insertion hole and a riser pipe mounting port are formed. The anchor hole mouth is covered with a member through a packing member, and the tension member insertion hole and the tension member or between the tension members and the tension member insertion hole are sealed by a sealing member formed of a porous foam. At the same time, the start-up pipe is started up from the anchor hole opening and inserted into the start-up pipe mounting opening of the cover member, and the air and water in the anchor hole and the cover member are discharged to the outside through the seal member. The hardening material is injected and filled into the anchor hole and the cover member from the rising pipe, and then the hardening material in the rising pipe is replenished and filled, and the pressure head generated by the height of the hardening material in the rising pipe and the specific gravity of the hardening material Maintain the pressurization It is obtained to perform the pressurization 圧養 raw cured material by the head.

According to a second aspect of the present invention, there is provided a hardening method for curing a hardened material, which comprises an annular flange for protecting the peripheral portion of the anchor hole opening in the ground by initial drilling prior to the main drilling of the anchor hole by the drilling machine. An anchor hole into which the provided guide pipe can be inserted is formed, and the guide pipe is inserted into the anchor hole so that the anchor hole opening is protected by the annular flange of the guide pipe during the main drilling of the anchor hole. It was done.

Further, in the pressure curing device for hardening material in the anchor construction according to the present invention, the tension material insertion hole of the tension material to be inserted into the anchor hole drilled in the ground and the rising pipe mounting opening are formed. A cover member that covers the anchor hole opening and is attached to the anchor installation position surface, a packing member that seals the anchor installation position surface and the cover member, and a detachable member that is raised from the anchor hole opening to the startup pipe attachment opening. A riser pipe that is freely inserted and inserted into the anchor hole and the cover member for injecting, filling and refilling the hardening material, and between the tension material insertion hole and the tension material or between the tension materials and the tension material insertion hole. And a sealing member formed of a porous foam that seals the space.

Further, in the pressure curing apparatus for a hardening material according to a fourth aspect, the cover member is formed in a taper shape in order toward the pulling material insertion hole, and the pressure curing method according to the fifth aspect. The apparatus is a stand-up tube molded with a transparent tube so that the stand-up height of the hardening material in the stand-up tube can be confirmed from the outside.

[0013]

According to the pressure curing method of the first aspect, when the hardening material is injected and filled from the rising pipe, the air and water in the anchor hole are discharged to the outside through the seal member, and the inside of the anchor hole and the cover are covered. When the inside of the member is completely filled with the hardening material, the inside of the pressure curing device is completely sealed by the sealing member.

After that, if the hardening material in the riser pipe is replenished and filled until the hardening material is hardened, the pressure of water flowing into the anchor hole and the pressure of the hardening material are balanced, and the hardening material flows into the anchor hole. Prevent the inflow of water.

According to the pressure curing method of the second aspect, the anchor pipe is prevented from collapsing at the time of the main drilling of the anchor hole by the guide pipe. On the other hand, according to the pressure curing device of the third aspect, the hardening material is filled from the rising pipe into the anchor hole covered with the cover member. According to the invention of the fourth aspect, the hardening material is completely filled. When filled, the sealing member is compressed by the tension material insertion hole and clogged with the hardened material, resulting in a complete seal within the pressure curing device.

Further, according to the fifth aspect, the rising height of the hardening material is confirmed from the outside, and the hardening material in the rising pipe is replenished and filled.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 1, reference numeral 15 denotes a waste concrete that is cast on the root cutting floor 17, and the waste condensate 15 has a wall body formed so as to surround the excavation area by using a steel sheet pile or the like as in the conventional case, and then the excavation is performed. The water level in the area was forcibly lowered by the groundwater level lowering construction method, and it was placed on the excavated root excavation floor 17. And
As shown in FIG. 2, anchor holes 21 are formed in the ground 19 in the excavation area.
Has been drilled by a drilling machine.

A pressure curing device 23 for hardening material according to an embodiment of the present invention is installed on the waste container 15. In the figure, reference numeral 25 denotes a cylindrical pipe formed with an inner diameter slightly larger than that of the anchor hole 21, and a connecting pipe 29 having a rising pipe mounting port 27 opening upward is connected to its peripheral wall as shown in FIG. A square fixing plate 31 as shown in FIG. 3 is attached to the outer periphery of the lower portion of the pipe 25. Then, by fixing the fixing plate 31 on the discarding container 15 with an anchor bolt installed in advance in the discarding container 15,
The pressure curing device 23 is installed at the anchor construction position. In FIG. 2, 33 is a packing member that seals between the discarding component 15 and the fixed plate 31, and in FIG. 3, 35 is a stud bolt insertion hole formed at each of four corners of the fixed plate 31. Reference numeral 37 denotes a cylindrical pipe mounting hole formed in the center of the fixing plate 31, and the cylindrical pipe 25 is mounted in the cylindrical pipe mounting hole 37 as shown in FIGS.

A transparent start-up pipe 38 is inserted into the start-up pipe mounting port 27 of the connecting pipe 29 so as to be detachable from the anchor hole 21a.
Cement milk S as a hardening material is injected from 8 into the anchor hole 21.

On the other hand, on the inner circumference of the upper portion of the cylindrical tube 25, as shown in FIG. 1, a tapered pipe material (hereinafter referred to as "tapered tube") 39 having a diameter gradually decreasing upward is formed between the cylindrical tube 25 and the central axis. It is also attached in the same manner, and its upper opening functions as a tension member insertion hole 43 for inserting the tension member 41 inserted into the anchor hole 21 as shown in FIG. Then, the tension member insertion hole 43 and the tension member 4
1 is a sealing member 4 made of porous foam such as sponge.
It is sealed with 5.

As shown in the figure, the tension member 41 in this embodiment has a structure in which a plurality of PC steel wires 41a bundled with each other are covered with a corrugated tube 41b made of polyethylene, and the sealing member 45 is an anchor. Tensile member 4 inserted in the hole 21
1 is inserted into the tension member insertion hole 43, and the pressure curing device 23
Is installed in advance at a predetermined position on the outer circumference of the wave tube 41b so that the inner circumferences of the pulling member 41 and the tapered tube 39 can be sealed. The seal member 45 may be attached to the inner circumference of the pulling material insertion hole 43 of the tapered tube 39, but the pulling material 41 may be replaced by the pulling material 41.
Since it may be peeled off when it is inserted in 3, the coil tube 41b is preferably wound around the outer circumference as in the present embodiment.

As shown in FIGS. 2, 5 and 6, the seal member 45 has the anchor milk 21, the cylindrical milk 25 injected from the rising pipe 38, the cylindrical pipe 25 and the tapered pipe 39. As it is filled inside, it moves to the tension member insertion hole 43 side.

That is, in the anchor hole 21, cleaning water at the time of drilling, breathing water of the cement milk S, etc. are accumulated, and when the cement milk S is injected and filled into the anchor hole 21 from the rising pipe 38. Since the cement milk S has a specific gravity of about 1.8, the cement milk S is replaced with the lower part of the air A or the water W in the anchor hole 21 as shown in FIG. Then, as the cement milk S is filled in the anchor hole 21, the cylindrical pipe 25, and the tapered pipe 39, the air A and the water W are discharged from the seal member 45 to the outside as shown in FIGS. 2 and 5. The seal member 45 is pushed up by the milk S toward the pulling member insertion hole 43 side. When the cement milk S is completely filled in the anchor hole 21 and the pressure curing device 23 as shown in FIG.
9 and the tension member 41 are compressed, and the cement milk S is clogged to completely seal the inside of the pressure curing device 23.

The pressure curing apparatus 23 according to this embodiment is constructed in this way. Next, one embodiment of the method of the present invention using the pressure curing apparatus 23 will be described. First, as in the past, after forming a wall body surrounding the excavation area using steel sheet pile, etc., a well is provided in the excavation area to pump underground water so that underground excavation can be performed safely, and the excavation area Forcibly lower the water level. Then, after excavation of the underground portion, as shown in FIG. 1, the discarding conical 15 is placed in the root cutting floor 17, and the anchor hole 21 is drilled in the ground by the boring machine. Then, the tension member 41
After the seal member 45 is wound around the outer periphery of the anchor, the tension member 41 is inserted into the anchor hole 21 as shown in FIG.

Then, as shown in FIG.
The tension member 41 is inserted into the tension member insertion hole 43, the fixing plate 33 is fixed to the anchor hole port 21a through the packing member 33, and the pressure curing device 23 is disposed on the waste container 15 and sealed. The member 45 is the taper pipe 39 and the tension member 4
Seal between 1 and 1. The riser pipe 38 may be removed from the connection pipe 29 in advance and connected to the connection pipe 29 at the same time when the pressure curing device 23 is installed.

Thereafter, as shown in FIGS. 2 and 5, the air A and the water W in the anchor hole 21 are discharged to the outside through the seal member 45, and the cement milk S is discharged from the rising pipe 38.
Is injected and filled into the anchor hole 21 and the pressure curing device 23. By injecting and filling the cement milk S, the seal member 45 is pushed up to the tension member insertion hole 43 side, and when the cement milk S is completely filled in the anchor hole 21 and the pressure curing device 23 as shown in FIG. Since the taper pipe 39 is sequentially tapered toward the pulling material insertion hole 43 side, the sealing member 45 is compressed between the taper pipe 39 and the pulling material 41 at the pulling material insertion hole 43 and cement milk Clogging occurs at S, and as a result, the inside of the pressure curing device 23 is completely sealed.

In this embodiment, the cement milk S is completely filled in the anchor hole 21 and the pressure curing device 23, and then the rising pipe 38 is supplemented with the cement milk S. While maintaining the pressure head generated by the height of the cement milk S in the riser pipe 38 and the specific gravity of the cement milk S, the pressure head cures the cement milk S in the anchor hole 21. .

This will be described in detail with reference to FIG.
The ground 49 of the anchoring portion M of the anchor 47 formed in the excavation area is the permeable ground, and the groundwater level N outside the wall is the construction surface P.
If it is above the wall body, as described above, water having the same pressure as the outside of the wall body flows into the anchor hole 21 due to the head difference from the groundwater level N on the outer side of the wall body.

Therefore, in order to prevent at least dilution and outflow of the cement milk S in the fixing part L, r _w × H ₁ ≤r _c × (H ₂ + H ₃ ) where H ₁ : inflow water pressure head H ₂ : Distance from the construction position to the upper part of the fixing part H ₃ : The rising height of the cement milk in the rising pipe r _w : Specific gravity of water (= 1) r _c : From the formula of the specific gravity of the cement milk, the upper part of the fixing part L At this time, as a rising height of the cement milk S in the rising pipe 38 for balancing the pressure of the water flowing into the anchor hole 21 and the pressure of the cement milk S, H ₃ ≧ (H ₁ / r _c) wherein the -H ₂ is derived.

That is, after the cement milk S is injected and filled from the start-up pipe 38 into the anchor hole 21, the cement milk is filled in the start-up pipe 38 so that the height becomes (H ₁ / r _c ) −H ₂ or more. If S is injected and filled, and the cement milk S is replenished and filled while maintaining this height until the cement milk S hardens, it is possible to prevent the cement milk S from diluting and flowing out of the fixing portion L due to inflow water.

Therefore, in the embodiment of the method of the present invention, the air A and the water W in the anchor hole 21 are discharged to the outside through the seal member 45, and the cement milk S is injected and filled from the riser pipe 38, Then, as shown in FIG. 6, the cement milk S is completely filled in the anchor hole 21 and the pressure curing device 23, and the inside of the pressure curing device 23 is completely sealed by the seal member 45. check the startup height H ₃ of the cement milk S of the inner external, to cement milk S is hardened, startup height H ₃ of the cement milk S of startup pipe 38 (H ₁ / r _c ) supplemented filled with cement milk S such that -H ₂ or more height, maintains its height H _3.

After the cement milk S has hardened,
It is sufficient to remove the riser pipe 38, place the basic concrete on the waste concrete 15 to bury the cylindrical pipe 25 and the taper pipe 39 in the basic concrete, and move to the next work step.

Thus, the cement mill according to this embodiment
The method of pressurizing and curing the wall is to install a wall around the excavation area.
Lower the groundwater level in the excavation area below the root cutting floor 17
After excavation, throw it away in the root cutting floor 17 and hit the con 15
Anchor hole 21 is drilled in the ground 19 with a hole drilling machine and anchored
Insert the tension member 41 into the hole 21 and pressurize and cure.
The container 23 is discarded, and the container 23 is removed via the packing member 33.
And then air A and water W in the anchor hole 21
The discharge pipe 45 is discharged to the outside through the starter pipe 38.
From the connecting pipe 29 to the anchor hole 21 and the pressure curing device 23.
It is injected and filled into the inside of the tension member insertion hole 43 and the tension member 41.
After sealing the space with the seal member 45, the inside of the rising pipe 38
Cement milk S startup height H₃From the outside
In the start-up pipe 38 until the cement milk S hardens.
Cement milk S startup height H ₃Is calculated by the above formula
Cement milk S is supplemented so that the height is above a specified value.
Filling and filling up the cement milk S in the riser pipe 38
Height H₃Caused by the specific gravity of cement and cement milk S
Cement milk S was pressure cured at the water head
Therefore, according to the present embodiment, at least the fixing by the inflow water is performed.
To prevent dilution and outflow of cement milk S in part M
It has become possible.

Further, according to the pressure curing apparatus 23 according to the embodiment of the present invention, the structure is simple and the workability is excellent, and the method of the invention can be easily carried out. If the ground of the anchor hole mouth is a collapsible ground such as sand, the back ground of the discarded concrete may be loosened due to the collapse of the anchor hole mouth ground, and the cement milk may escape when cement milk is injected and filled. .

Therefore, prior to the main drilling of the anchor hole by the drilling machine, the guide pipe 53 having the annular flange 51 for protecting the peripheral portion of the anchor hole mouth 21a as shown in FIG. 8 can be inserted into the ground by the initial drilling. Form an anchor hole,
By inserting the guide pipe 53 into the anchor hole and protecting the anchor hole opening 21a with the annular flange 51 of the guide pipe 53 during the main drilling of the anchor hole 21, the cement milk S Dispersion can be prevented.

Further, the tension member 41 in the embodiment of the above-mentioned method and apparatus has a structure in which a plurality of bundled PC steel wires 41a are covered with a polyethylene wave tube 41b, so that the outer circumference of the wave tube 41b is By attaching the seal member 45, the tension member 41 and the tension member insertion hole 43 can be sealed, but a plurality of PC steel wires can be simply used without covering the PC steel wire with the wave tube 41b as described above. When using the bundled tension member, it is necessary to wind a seal member for each PC steel wire to seal the gap between them and then to cover the outer periphery of the bundled PC steel wire with a seal member. There is.

Even if the tensile member having such a structure is used, the intended purpose can be achieved as in the above-mentioned embodiment.

[0038]

As described above, according to the hardening curing method of the hardening material according to the first aspect, it is possible to prevent at least the hardening material from diluting and flowing out of the fixing portion due to the inflowing water. According to the pressure curing method of the second aspect, when the ground at the anchor hole mouth is a collapsible ground such as sand, there is an advantage that the hardened material can be prevented from escaping due to the collapse of the anchor hole mouth ground.

The pressure curing device 23 according to the third aspect.
According to this, the structure is simple and the workability is excellent, and it is possible to easily carry out the pressure curing method according to the first and second aspects.

Further, according to the pressure curing apparatus of the fourth aspect, when the hardening material is completely filled in the anchor hole and the pressure curing apparatus, the sealing member is compressed by the tension material insertion hole. The hardening material causes clogging, and as a result, there is an advantage that the inside of the pressure curing device can be completely sealed. Further, according to claim 5, upon supplementary filling of the hardening material in the rising pipe,
This has an advantage that the rising height of the hardened material can be easily confirmed from the outside.

[Brief description of drawings]

FIG. 1 is a side view of a pressure curing device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a pressure curing device showing a state where cement milk is injected and filled from a riser pipe.

FIG. 3 is a plan view of a fixing plate.

FIG. 4 is a plan view of the pressure curing device shown in FIG.

FIG. 5 is a cross-sectional view of the pressure curing device showing a state where cement milk is injected and filled from a riser pipe.

FIG. 6 is a cross-sectional view of the pressure curing device showing a state in which the filling and filling of cement milk has been completed.

FIG. 7 is an explanatory diagram for obtaining the rising height of the hardening material in the rising pipe in the pressure curing method according to the present invention.

FIG. 8 is a sectional view of a pressure curing device in a second embodiment of the method of the present invention.

FIG. 9 is an explanatory view showing a stable construction method for the entire building by creating an anchor.

FIG. 10 is a schematic explanatory diagram of a conventional anchor construction method in an underground portion.

[Explanation of symbols]

15 Discarded Con 21 anchor hole 23 Pressure curing device 25 cylindrical tube 31 Fixed plate 33 Packing member 38 Start-up pipe 39 Taper tube 41 Tensile material 43 Tension material insertion hole 45 Seal member 51 annular flange 53 Guide pipe

Claims (5)

[Claims] 1. A wall is provided so as to surround the excavation area, the groundwater level in the excavation area is lowered to below the root cutting floor by the groundwater level lowering method, and then excavated. Anchor holes are drilled in the ground with a hole drilling machine, and tension members are inserted into the anchor holes.Next, the anchor member holes are packed with packing members by a cover member in which tension member insertion holes and riser mounting holes are formed. And seal between the tensile material insertion holes or between the tensile materials or between the tensile materials and between the tensile material insertion holes with a sealing member made of a porous foam, and at the same time, install a cover member rising pipe. Insert the start-up pipe into the opening from the anchor hole and insert air into the anchor hole and the cover member to the outside through the sealing member. Inject and fill inside and cover member After that, the hardening material in the riser pipe is replenished and filled to maintain the pressure head generated by the height of the hardening material and the specific gravity of the hardening material in the riser pipe, and the pressure hardening of the hardening material is performed by the pressure head. A method of pressure curing a hardening material in forming an anchor characterized by the above. 2. An anchor hole into which a guide pipe provided with an annular flange for protecting the peripheral edge portion of the anchor hole opening is formed in the ground by initial drilling prior to the main drilling of the anchor hole by the hole drilling machine, The guide pipe is inserted into the anchor hole so that the anchor hole opening is protected by the annular flange of the guide pipe when the anchor hole is actually drilled. Curing method for hardened materials in. 3. A cover member for forming a tension member insertion hole of a tension member to be inserted into an anchor hole drilled in the ground and a riser pipe mounting opening, and covering the anchor hole opening and attaching to a surface of a working position of the anchor. A packing member that seals the surface where the anchor is installed and the cover member, and is detachably inserted into the start-up pipe attachment opening from the anchor hole opening, and a hardening material is injected into the anchor hole and the cover member. Filling and refilling, a rising pipe, and a sealing member formed of a porous foam material that seals between the tensile member insertion holes and the tensile members or between the tensile members and the tensile member insertion holes. A hardening and curing device for hardening material in forming an anchor. 4. The pressure curing device for hardening material in the anchor construction according to claim 3, wherein the cover member is formed in a taper shape in order toward the pulling material insertion hole. 5. The anchor construction according to claim 3 or 4, wherein the riser pipe is formed of a transparent pipe from which the rise height of the hardened material in the riser pipe can be confirmed from the outside. Curing material pressure curing device.