JPH01230809A - Grout pouring method - Google Patents

Abstract

PURPOSE:To aim at sure improvement in the title grout pouring within the required range by advancing a boring rod in a ground followed by pouring grout in the escavated hole through a backward pouring method to pour a pouring pipe into the solidified body of the grout for pouring the grout in advance. CONSTITUTION:A boring rod 1 is advanced into a ground by a determined depth with use of a tip bit 2 and a pouring pipe is inserted into the boring rod 1 to the tip thereof. With the boring rod 1 being drawn, the pouring pipe 3 is sequentially drawn so as to pour a grout S1 into the excavated hole 4. The pouring pipe 3 drawn up to the tip of the boring rod 1 is sequentially pressed in advance into the solidified body of the grout S1 from the upper side so as to discharge and pour the grout S2 into the circumference ground. Thus, it is possible to prevent the poured grout from escaping to the upper side of the ground and as well as continuous pouring.

Description

[Detailed Description of the Invention] "Industrial Part 2 Field of Application" This J is related to a grout injection method for strengthening or IF wood of soft or water-logged ground.

``Conventional technology, problems that need to be solved by invention'' In recent years, along with the development of concrete construction companies, research and development of ground improvement contact has become popular, and environmental conservation has also become a major issue. There is.

In particular, in the Taraud injection method, it is desirable to securely solidify the target area without escaping the grout from the perspective of water quality conservation in the ground, and consideration for the environment around the injection point is particularly important. Prevention of uplift of the ground surface and deformation of buildings and buried objects is also an issue that must be solved at the same time.

By the way, conventional grout injection methods can be roughly divided according to the construction method: the backward (h-ascent) injection method, in which the injection pipe is pulled out from 1-, then +lrt, and then step-injected from below in the L direction, and the 2-injection pipe method. It can be divided into the forward (down) injection method, in which step injection is performed sequentially from the top to the bottom while descending.

The former (retractable type) uses the borehole plug 1-, which is drilled in the ground and press-fitted, as an injection pipe, and then pulled out. This is a lot injection method that requires manual labor, and the equipment is simple, economical, and inexpensive, so it is difficult to see why this method is currently being used.

What is the structure of the boring rod that serves as the injection pipe? There are multiple tubes outside the Li tube, and in particular, in the method using multiple capillary tubes, the main grout agent and the reactant are guided through separate 170 wave channels to the rod end and mixed, so it is possible to inject instant setting grout. It is generally used as a two-claw pipe instant setting method, but this single-claw channel is used to first inject instant setting grout, and then this instant setting Clara [- Slow-setting grout is injected into the IJ, followed by sequentially removing the double-pipe pipes, and then injecting fast-setting and slow-setting grout alternately in the same step into a multi-pipe composite grout base material (IJ).
It's here.

However, what about these regressive formulas, E-r-?
Although there is an improvement to reduce the tendency of grout to escape to a distant place, which is a disadvantage of the n-tube Lothoe method, it is possible to suppress fθ1, which is the disadvantage of the retrograde injection method, that the grout tends to deviate to the upper part of the ground. This can lead to poor water supply and solidification due to leaving unimproved areas between the upper and lower injection tubes, wood contamination due to deviations, and furthermore, the possibility of upheavals on the ground surface, buildings, and buried objects due to the theory that it is impossible to do so. There is a risk of inducing deformation.

The latter (advance type) is represented by the strainer method and the duffle backer method, and this r method is the J1! ! According to these forward injection methods, the strainer pipe is inserted and installed after drilling a hole in the board, and the injection is carried out by sequentially moving steps from the upper part of the strainer toward the F part.
The disadvantages of the former retreating method are that the tendency of the grout to deviate can be suppressed, that the equipment is complicated, that the hole diameter is large, and that the injection pipe remains buried in the ground. Overall, there is a drawback that the cost is high.

Furthermore, in addition to the Strainer-L method and the Tufflebacker King method, as a known construction method, a guide tube is installed on the surface of the improved area at °C, and a cleaning tube is inserted into the guide tube in order to carry out forward injection. After drilling a first depth hole in the ground while injecting high-pressure water from its tip, the cleaning pipe is pulled out, a grout hose is connected to the kite pipe, grout is pumped out, and the grout is pumped from inside the drilled hole to the riverside. jl! ! The grout was injected into the ffi, and then the cleaning tube was inserted into the kite tube again and pressed into the solidification of the first step, breaking through it. High-pressure water is pumped into this guide pipe to discharge the slime inside the pipe and around the cleaning pipe, the cleaning pipe is pulled out and grout is injected into the surrounding ground in the same manner as above, and the same J
An advance type injection method that repeats double injection is also known (Special Publications Act 5
No. 7-39336).

However, in D, there is no need to leave the injection pipe in the Jl, and since the cleaning pipe is press-fitted into the solidified material created in the 11th process and the ground next to it, there is a limit to the depth of the injection air. In addition, there are 11 geological layers such as gravel and bedrock.
! ! Depending on the board properties, there are disadvantages such as inability to perform the process.9 In any case, these methods also have problems in terms of work efficiency, as injection is stopped each time a step is moved. .

[L Stage for Solving Problems] In order to solve the problems of the prior art mentioned above, this invention involves drilling a boring rod into the ground to a predetermined depth, and then raising the hole rod to an arbitrary position while By injecting grout into the borehole, press-fitting the injection pipe inserted into the hollow part of the boring rod into the solidified body of grout, and discharging the grout without lowering the 11th press-fit, the rod 1 method is performed. It is possible to carry out continuous injection work by taking advantage of the simplicity of the forward-moving corporation, and to reliably improve the target area, preserve water quality, raise the ground surface, and change the structure and buried objects. This paper proposes a reasonable method f:I2 that can achieve the prevention of such problems.

"Embodiments" Hereinafter, embodiments of the present invention shown in the drawings will be explained.
Figure 1 shows the first embodiment of this system 191 on a construction site. First, excavation water is pumped into the ground using a boring rod 1 at its tip, and then the drilling water is advanced to a predetermined improvement depth using a drill at the tip 2. a), Next, insert the injection tube 3 into this Holin clot ■ up to the tip. b) Leave this injection tube 3 as it is, pull up the Holin clot l to a predetermined height, and pull it out from the tip of the injection tube 3. In order to start injecting the grout S1 into the hole trace 4 left by the drilling, the injection pipe 3 is sequentially pulled out while the hole groove 1 is continuously pulled up to the L limit position of the improvement range. Grout S in drilling hole MP4
, d, e), and the first step by backward injection is completed.

Next, the injection tube 3 pulled out to the tip of the Borin clog +-1 is press-fitted from the L side into the solid body 4+ of the tallow S1 filled in the first lower part of 1-, and the press-fitting is advanced sequentially. The grout S2 is then discharged (f), and the grout S2 is injected into the surrounding ground around the solidified body of the grout S1 by pressing it forward in the same manner (f), and the second [ Finish the process.

In this case, the grout S2 is injected into the grout S1.
When the injection pipe 3 is press-fitted into the solid body, the grout is injected through the crack, and then the grout S2 is ejected to break the solid body and injected.

The boring rod l to be used has the injection pipe 3 inserted inside it.
If there is a 1j moat, is the middle pipe also multiple? Agency ゛C is also good, injection pipe 3
An inverted lE valve 5 that can be opened and closed is provided at the opening at the tip of the injection tube 3 to seal the area around the inserted injection tube 3.

The grout S1 used in the first step is a solution type and a suspension type.
It may be either instant setting or slow setting, and the point is that the drilled hole 1i
1) Consolidation strength (strength at the time of press-fitting) that can prevent the collapse of the A4, especially at the time of press-fitting the injection pipe 3 in the second step, so that it can be press-fitted relatively easily. It is necessary for the injection implant to maintain the V of the hole wall of the drilled hole 4 at least.

Clara +-s 2 used in the first part is 9! Preferably, it is a solution type with good permeability, or it may be an instant setting type or a suspension type. It is necessary that it can be broken and injected into the unconsolidated surrounding ground, and in some cases, only instant setting grout or only edge setting grout is injected, and in some cases, instant setting grout is injected first, Next, a slow-setting grout may be injected, and either a solution type or a suspension type may be used, or both may be used in combination.

The injection pipe 3 may be a medium pipe or a multi-capillary pipe, and may be a rigid pipe such as a steel pipe or a flexible pipe such as a synthetic resin pipe. Any material having sufficient strength to be press-fitted into the solidified body of the grout S may be used, and the grout S is press-fitted continuously or at predetermined steps without or without rotation.

For example, a rigid sharp cone 6 is attached to the tip of the injection tube 3, and an arbitrary number of holes 7 are provided in the cone 6. in this case,
The injection hole 7 is sunk downward at the tip, and the injection pipe 3 is press-fitted after the grout S2 is injected in a jet type.
good.

If the injection tube 3 is made of flexible material such as soft synthetic resin, it can be used by inserting it into the rigid guide tube 8 that is connected in sequence as shown in Fig. 2, so that it can be easily bent during press-fitting. As a result, the feeding operation can be carried out at a low level, which improves work efficiency, and it has advantages such as being able to be rolled up and handled during transportation.

Next, the second embodiment shown in FIG.
After drilling a hole (a), the water swivel for drilling water during drilling is replaced with a swivel equipped with a sealing part 9, and an injection pipe 3 is used.
Insert the injection tube 3 to the tip of the boring rod l b), then pull the injection tube 3 together with the boring rod l towards the body.
- Therefore, liquid A is pumped into the injection pipe 3 and liquid B is pumped into the bowlin clogs 1 to 1, and grout Sl, which is a mixture of liquids A and B, is injected into the hole trace 4 at the tip. do(
C) First, finish the step f, and then mix liquid A and B in the injection tube 3 while pressing the injection tube 3 into the solidified body of the grout S1 in the same way as in the second step. The grout S2 is pumped and injected.

In this second embodiment, first, J and E are placed on the retractable injection surface.
Because I can't pull the entry pipe 3 and the boring rod l at the same time, A.
This embodiment is different from the first embodiment in that grout S1, which is a two-component mixture of B, is injected, and grout S2, which is a two-component mixture of A and B', is injected in the second stage.

Note that grout S9 in this case. For S2, use a grout having the composition listed in Clothing 1 below.

Figure 4 shows a schematic diagram of this process in step 11.
As shown in FIG. 3(e), it is also possible to additionally inject grout S2 in the middle of pulling out the injection pipe 3 after completing the final step of the forward step injection.

Also, as shown in Fig. 5, after pulling out the injection tube 3 (a)
(b) Is it optional to fill the hole where the injection tube 3 has been pulled out, or if it is, do it depend on the hardness of the filling grout? Use an appropriate bonding strength.

In this manner, after completing all the steps in consideration of re-injection, etc., the Borin clogs 1 to 1 are pulled out and recovered.

The present invention will now be explained in detail based on specific experimental examples.

Experimental Example 1 As shown in Fig. 6, the boring rod 1 is a double pipe lot in which the tip between the inner and outer pipes is closed with a bottom plate 10, and a communication hole 11 is provided inside. As shown in Figure 7, after drilling three holes to a depth of 5 m at a pitch of 1 m, while gradually raising the holes to a depth of 2 m, liquid A is pumped through the counterflow path and liquid B is pumped through the outer wave path, and they are mixed together at the tip. A grout Sl shown in Attachment 1 consisting of liquids A and B was injected into the drilled hole 4 (first step).

In this injection process, the injection length per piece is 3 m, and 1 step is 4.
Divided into 6 steps as 450cm, 7 steps per l step.
In the final step, the boring rod L was pulled up to a depth of 2 m, and a total of 42 (1 A) were injected into the 3 m drilled hole gA4.

The quality was sandy and gravelly at a depth of 3 to 4 meters.
.

Next, remove the two-piece swivel at the top of the Borintaro Soto L, insert the injection tube 3 into its inner tube, bend it manually, and press the tip into the solidified body of the grout S1.
When the boring rod 1 is extended 50 cm from the do end, liquid A is pumped from the 7-shaped tube at the rear end of the injection pipe 3, and liquid B' is pumped from the other side, and they are mixed together inside the injection pipe 3. Tarau 1 to S shown in Attachment 1-1 consisting of A+B' liquid
2 injection was started (fJS two steps).

In this injection process, the injection tube 3 must be advanced forward one by one.
A total of 480 injections were carried out at 80 M per step (16 M/min) for 6 steps as a step preparation of 50C-.

The same process was then repeated for drilling holes in the other two trees.

Table 1 Experimental Example 2 Performed next to Experiment 1, hole drilling, improved depth total injection,
The injection amount was changed as shown in the following, and as grout S2 in the first step, 5 tons of grout in the crown shown in Appendix Table 2 was used.
-I (liquid A and liquid B), 52-11 (liquid A and liquid B'), 5
2-ff1 (liquid A + liquid B'') was used in combination.

1st L step (backward injection) S r (A”B) In sentence x 6 steps = 60
Second Wang Chen (progressive injection) In other words, in Experiment 1, one step of solution-type instant setting grout S (AM+B solution) was applied during the backward injection in the first step.
In contrast, in Experiment 2, one step was taken to minimize the collapse of the hole wall at drilling trace 4 to obtain 1 h L/ll.
I kept it low.

In addition, in Experiment 1, a solution-type slow-setting grout (liquid B') was used as grout S2 in the second double progressive injection, or in Experiment 2, in each step, After injecting the instant setting grout (S2-1.52-III),
Next, slow-setting grout (S2 II) was injected, and since the two steps between 3 and 4 m in depth hit gravel, first a suspension type instant-setting grout (S2-I [I) was injected. After injection, follow with solution-type slow-setting Clara I~(S2-II
) was injected.

+i? The switching between liquid B, B゛ liquid and B'' liquid in step 8 of the j-adic injection was carried out using suction 1 of the grout pump.
Because the platform was relatively short, it was possible to use it as a single tube to inject not only slow-setting grout but also instant-setting grout.

In addition, in this experiment, the improvement range was shallow, so injection tube 3 was press-fitted manually. :For final construction, it is desirable to automate mechanical press-fitting using mechanical press-fitting means such as press-fitting jacks and pressure-feeding roller devices.

Table 2 Results and discussion of Experiment 1.2 The injection effect of Experiment 1.2 [rA was carried out by the 11th observation during the shaft excavation, or in the second step, the injection position was sequentially changed from the lower layer to the lower layer. By performing the so-called progressive injection method, the tendency of the grout to deviate into two parts was suppressed, and good results were obtained by allowing the grout to penetrate or interfere with each other between each injection hole.

In this experiment, the l step length was set to 0.5- for both the first and second steps, and the injection was performed in stages, or it was also possible to perform slowly and continuously forward or backward injection without steps. be.

In addition, in this experiment, the TARAUDE S1 used for the backward injection in the first step was a water glass solution type, so the strength of the homogel during press-fitting of the injection tube 3 in the second step was determined by uniaxial compression. The strength was small, about 0.5 g/c11', and it was suitable because it could be easily press-fitted.

Furthermore, the taraut S used in the first step and the second step
2 and their combinations are illustratively shown in Experiments 1 and 2, but are not limited to these. For example, a slow-setting grout may be used during the first injection, and a solution-type grout may be used. Besides, a suspension type may also be used.

However, especially when using suspension type grout, it is important to know the presence or absence of cement components, their content, etc., and the changes in consolidation strength and strength development over time. Is it necessary to use it? The strength at which injection tube 3 can be press-fitted (11) is approximately 2 to 3 at the time of press-fit (-axial compressive strength).
It is about g/cm', or Ilf or l Kg/
It may be within cm2.

In addition, the grout S2 used in the first and second steps is (1) slow-setting, suspension or solution type, or a combination of both.

(Cast-condensing, suspension or solution type, or a combination of both.

(31 A combination of slow-setting, suspended pA type and instant-setting, solution type.

Value) Combination of quick setting solution type and slow setting solution type.

(5) Combined use of instant setting suspension type and slow setting solution type.

It is also optional to use water glass grout or other grout.

Furthermore, the construction method of the present invention can be applied not only downward, but also in any direction such as - direction, water f, etc.

In short, this invention uses various types of grout with arbitrary gel times or in combination, and the consolidation strength of the grout s1 filled in the drilling trace 4 in the first step is determined by the injection tube 3 in the second step.
By moving the injection position in the forward direction, the tendency of the Clara l-s 2 to easily deviate in one direction can be suppressed. It is characterized by being injected into the surrounding ground.

1'Effects of IJI As mentioned above, this invention rationally combines two retreating and forward injections to take advantage of the simplicity and advantages of forward injections. It is possible to continuously inject and flow upstream.
[11] It is possible to reliably improve the target area and ensure that water quality is maintained, ground surface upheavals, and buildings and buried objects are prevented from being deformed.

4.1" Explanation of the inside of the cylinder on side A
>, D) ■Longitudinal cross-sectional views shown in order of steps, vertical cross-sectional views showing embodiments of the RS7 flexible injection tube used in the invention of 21st Penalty 1P Te [A, Figures 3 (a) to (e) are 41J(a) to (e) are longitudinal sectional views schematically showing the steps of the present invention; and FIGS. 5(a) to (C) are 6(a) to 6(a) are vertical cross-sectional views schematically showing the process of regeneration.
d) is a t-side view showing the process of the experimental example of the present invention, and No. 7 [2I is a t-side view showing the drilling mode of the experimental example.

l... Boring rod, 2... Bit, "3...
Injection pipe, 4. Drilling trace, 5. Reverse 11 valve, 6. Cone, 7. Injection hole, 8. Rigid guide tube, 9. Seal part, 10. Bottom plate, 11. Communication hole, S,, S2... grout.

Claims (1)

[Claims] 1) Drilling a boring rod into the ground to a predetermined depth,
Next, a first step of injecting grout under the conditions of A) below into the hole trace while pulling the boring rod to an arbitrary position, and injecting the grout in the injection pipe inserted into the hollow part of the boring rod in the first step. A) The grout used in the first step may be a solution type, suspension type, It may be either quick-setting or slow-setting, and maintains a solidification strength that prevents the wall of the drilled hole from collapsing and allows the injection pipe to be press-fitted in the second step. thing. B) The grout in the second step may be a solution type, a suspension type, an instant setting type, a slow setting type, or a combination thereof, and the grout in the periphery of the grout solidified body in the first step may be It must be able to be injected into the ground. A grout injection method characterized by: