JP5681039B2 - Mountain fastening method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a mountain mounting method for construction in which a new building is constructed by excavating deeper than the lower end portion of an existing underground outer peripheral wall when the groundwater level is higher than a newly built flooring level.

  Conventionally, the following construction method shown in FIGS. 13 to 18 is known as this type of mountain fastening method. In this mountain retaining method, first, the existing underground structure 1 is dismantled in advance (see FIG. 13). In this case, the existing underground outer peripheral wall 2 and the pressure plate frame 3 remain.

  Next, after backfilling with the remaining soil 4 (see FIG. 14), the outer portion 2a of the existing underground outer peripheral wall 2 is dismantled from the ground using a rock auger machine or a CD machine (see FIG. 15). The continuous wall 5 is formed by carrying out a mountain retaining work by the (registered trademark) method (see FIG. 16).

  Then, the backfill 4 that has been backfilled is excavated and removed again, and the horizontal beams 6 and the existing underground frame 1a are sequentially reconstructed from the top (see FIG. 17). Is excavated and floored (see FIG. 18), and then the construction of the new underground foundation foundation is started.

  In each figure, GL (ground line) indicates a ground line, and WL (water line) indicates a groundwater level.

  JP-A-2001-271365 discloses a structure in which a thin wall having water-stopping performance is constructed on the outer periphery of an existing underground frame up to a position deeper than the existing underground frame, and the outer wall of the existing underground frame is used as a mountain stop. A construction method for a structure is disclosed (see Patent Document 1).

JP 2001-271365 A

  In the conventional mountain retaining method, the remaining soil is backfilled, re-excavated, removed, or dismantled with a rock auger or CD machine, resulting in a long work process and high work costs. have.

  In addition, the dismantling work using a rock auger machine or a CD machine has a problem that a very large noise and vibration are generated, which causes a complaint from neighboring residents.

  Furthermore, large heavy machinery such as rock auger machines and pile driving machines have a problem that it is difficult to enter a site with a large level difference.

  For this reason, the conventional mountain fixing method solves the problem of shortening the work process and reducing the work cost, suppressing the generation of noise and vibration, and the problem of entering large heavy machinery on a site with large steps. Has a problem that must be.

  The gist of the present invention for solving the problems of the conventional example is a construction for constructing a new building by excavating the ground deeper than the lower end portion of the existing underground outer peripheral wall when the groundwater level is higher than the level of new flooring. The water retaining method is to inject a water-stopping chemical solution along the outside of the existing underground outer peripheral wall from above the lower end portion of the existing underground outer peripheral wall to the insertion position. Forming the existing underground perimeter wall and the pressure plate frame, and dismantling the existing underground structure in advance, and constructing the horizontal beam inside the existing underground perimeter wall and dismantling the existing underground structure from above It repeats sequentially, excavating the inside of the water-stopping chemical solution layer at the lower part of the existing underground outer peripheral wall, and forming a concrete wall for a retaining wall at the lower part of the existing underground outer peripheral wall.

  Further, the gist of the present invention is a mountain mounting method of construction for constructing a new building by excavating the ground deeper than the lower end portion of the existing underground outer peripheral wall when the groundwater level is higher than the newly built flooring level, The existing underground perimeter wall and the pressure plate frame are placed and the existing underground enclosure is dismantled in advance, and extends from the lower end of the existing underground outer peripheral wall to the rooting position along the outside of the existing underground outer peripheral wall. A water-stopping chemical solution layer is formed by injecting a water-stopping chemical solution, and a horizontal beam is erected on the inside of the existing underground outer peripheral wall and the dismantling of the existing underground skeleton is sequentially repeated from above, The inside of the water-stopping chemical solution layer is excavated at the lower part of the outer peripheral wall, and the concrete wall for the retaining wall is formed at the lower part of the existing underground outer peripheral wall.

The injection of the chemical solution is performed by drilling from the ground to a required depth using a double tube rod;
Injecting the chemical solution in a zigzag manner along the outside of the existing underground outer peripheral wall;
Excavation of the lower part of the lower end of the existing underground outer peripheral wall and formation of the concrete wall are performed for each required width along the lateral direction of the outer peripheral wall;
Is included.

According to the mountain retaining method according to the present invention, the existing underground outer peripheral wall is used as a mountain retaining, so that the operation cost can be reduced as compared with the conventional example.
Further, since the remaining soil is not backfilled or re-excavated and removed as in the conventional example, and there is no dismantling work by a lock auger machine or the like, the work process can be greatly shortened and the work cost can be reduced.
Similarly, since a large heavy machine such as a lock auger machine or a CD machine is not used, not only the generation of noise and vibration can be suppressed, but also the problem of entering a large heavy machine on a site having a large step can be solved.
Further, since the remaining soil is not backfilled, various excellent effects can be achieved such that the number of vehicles carried in can be reduced.

  By injecting the chemical solution from the ground by drilling to the required depth using a double tube rod, it is possible to efficiently inject the chemical solution and to produce an excellent effect of reliably forming a water-stopping chemical solution layer. .

  By injecting the chemical solution in a staggered manner along the outside of the existing underground outer peripheral wall, the chemical solution is uniformly injected and the water-stopping chemical solution layer can be reliably formed with a required thickness.

  The excavation of the lower part of the lower end of the existing underground outer peripheral wall and the formation of the concrete wall are performed for each required width along the lateral direction of the outer peripheral wall, so that an excellent effect that the concrete wall for the retaining wall can be reliably formed. Play.

It is a longitudinal cross-sectional view which shows the state which formed the water stop chemical | medical solution layer 12a along the outer side of the existing underground outer peripheral wall 11. FIG. It is a longitudinal cross-sectional view which shows the state which disassembled the existing underground skeleton 17 in advance. It is a longitudinal cross-sectional view which shows the state which constructed the horizontal beam 19 and disassembled the existing underground skeleton 17. It is a longitudinal cross-sectional view which shows the state which formed the concrete wall 20 in the lower part of the lower end part 11a of the existing underground outer peripheral wall 11. FIG. It is a longitudinal cross-sectional view which shows the state which excavates the remaining soil 22 to the flooring level 21, and floors. It is explanatory drawing explaining a double pipe strainer construction method. It is explanatory drawing explaining a double pipe strainer construction method. It is explanatory drawing explaining a double pipe strainer construction method. It is explanatory drawing explaining a double pipe strainer construction method. It is a cross-sectional view showing a plane outside the existing underground outer peripheral wall 11. It is a process table | surface which compares an example of the process of the first half of the mountain fastening method of this invention and a prior art example. It is a process table | surface which compares an example of the latter half process of the mountain fastening method of this invention and a prior art example. It is explanatory drawing of the mountain fastening method concerning a prior art example. It is explanatory drawing of the mountain fastening method concerning a prior art example. It is explanatory drawing of the mountain fastening method concerning a prior art example. It is explanatory drawing of the mountain fastening method concerning a prior art example. It is explanatory drawing of the mountain fastening method concerning a prior art example. It is explanatory drawing of the mountain fastening method concerning a prior art example.

  Next, embodiments of the present invention will be described with reference to the drawings. The present invention is a mountain retaining method of construction for constructing a new building by excavating the ground deeper than the lower end portion 11a of the existing underground outer peripheral wall 11 when the groundwater level WL is higher than the new flooring level 21. 1 to 5 are longitudinal sectional views of the existing underground skeleton 17.

  As shown in FIG. 1, the mountain fastening method according to the present invention first extends along the outside of the existing underground outer peripheral wall 11 from about 1 m above the lower end portion 11 a of the existing underground outer peripheral wall 11 to the rooting position. A water-stopping chemical solution 12 is formed by injecting the water-stopping chemical solution 12. The rooting position is a portion where piles, foundations or pillars are buried in the ground. The chemical solution 12 is desirably used as an instantaneous type and a slow setting type of an inorganic solution type water glass type grout material.

  As shown in FIGS. 6 to 9, the chemical solution 12 is injected by a double tube strainer method. That is, the boring machine 13 is installed and drilled to the required depth using the double tube rod 14 (see FIG. 6). After the drilling is finished, the instantaneous-type chemical solution 12 is primarily injected (see FIG. 7). Next, the warming-type chemical solution 12 is secondarily injected (see FIG. 8), and the primary injection and the secondary injection are sequentially repeated while being pulled upward to form the water-stopping chemical solution layer 12a having the required width and height. (Refer to FIG. 9) After the injection, the boring machine 13 is moved to the next drilling position.

  Moreover, the injection | pouring of the chemical | medical solution 12 is performed in zigzag form along the outer side of the existing underground outer peripheral wall 11, as shown in FIG. By making such a staggered pattern, the water-stopping chemical solution layer 12a is uniformly formed with a required thickness. In addition, the code | symbol 15 in FIG. 10 shows a drilling part, and the code | symbol 12b shows the spreading | diffusion range of the chemical | medical solution 12 from the drilling part 15. FIG.

Next, as shown in FIG. 2, the existing underground building 17a is dismantled in advance. In this case, the existing underground outer peripheral wall 11 and the pressure plate frame 18 remain.
In addition, you may perform the process of inject | pouring the above-mentioned chemical | medical solution 12 after the process of disassembling the said existing underground skeleton 17a in advance.

  And as shown in FIG. 3, the disassembly of the inner part 11b of the existing underground outer peripheral wall 11, the construction of the horizontal beam 19 inside the existing underground outer peripheral wall 11, and the dismantling of the existing underground enclosure 17a are performed from the upper floor. After the process is repeated sequentially, the pressure plate frame 18 is disassembled. The existing underground outer peripheral wall 11 will be used as a mountain stop.

  Further, as shown in FIG. 4, the lower part of the lower end portion 11 a of the existing underground outer peripheral wall 11 is excavated, and a formwork (not shown) is installed in the lower part of the lower end portion 11 a of the existing underground outer peripheral wall 11. To form the concrete wall 20 for the retaining wall on the inner side of the water-stopping chemical liquid layer 12a.

  The excavation of the lower part of the lower end 11a of the existing underground outer peripheral wall 11 and the formation of the concrete wall 20 are performed by dividing the elements along the lateral direction of the outer peripheral wall every required width, for example, every 2 m. By dividing the elements in this way, the concrete wall 20 is reliably formed.

  Then, as shown in FIG. 5, the remaining soil 22 is excavated and floored to the flooring level 21, and the vicinity of the lower end portion 20 a of the concrete wall 20 is backfilled 23, and subsequently, a new underground foundation foundation construction is started.

  Next, an example of the process of the mountain fastening method of the present invention as described above will be described in comparison with an example of the process of the conventional mountain fastening method.

  First, as shown in the process charts of FIGS. 11 and 12, the mountain fastening method of the present invention is (A) 7 weeks for the injection of the chemical solution 12, (B) 4 weeks for the prior dismantling of the existing underground skeleton 17 (C ) 9 weeks for the construction of the horizontal beam 19 and the dismantling of the existing underground skeleton 17; (D) 4 weeks for the excavation of the lower part of the existing outer peripheral wall 11 and the formation of the concrete wall 20; (E) 2 for the final excavation and flooring Each week will take a total of 26 weeks, and the construction of the new underground foundation will start from the 27th week.

  On the other hand, the conventional method of retaining the mountain is (F) 4 weeks for the existing underground structure 1, (G) 4 weeks for the backfilling of the remaining soil 4, (H) 8 weeks for the dismantling with the rock auger machine, (I) 8 weeks for the SMW construction method, (J) 14 weeks for excavation of the remaining soil 4, construction of the horizontal beams 6 and dismantling of the existing underground frame 1a, (K) 2 weeks for final excavation and flooring, totaling After 40 weeks, the construction of the new underground foundation will start from the 41st week.

  As described above, the conventional mountain retaining method takes 40 weeks to start the construction of the newly built underground foundation, whereas the mountain retaining method of the present invention takes 26 weeks, and the difference in the work process is 14 weeks. However, the present invention can shorten the operation cost.

As described above, the mountain retaining method according to the present invention forms the water-stopping chemical solution layer 12a along the outer side of the existing underground outer peripheral wall 11, and forms the concrete wall 20 for the mountain retaining reinforcing wall on the inner side. Will be formed.
Moreover, since the existing underground outer peripheral wall 11 is utilized as a mountain stop, work cost can be reduced compared with a prior art example.
Furthermore, since there is no backfilling or re-excavation / removal of the remaining soil, and there is no dismantling work with a lock auger machine, etc., not only can the work process be greatly shortened, the work cost can be reduced, but also noise and vibration Occurrence can be suppressed.

DESCRIPTION OF SYMBOLS 1, 1a Existing underground frame 2 Existing underground outer peripheral wall 2a Outside part 3 Pressure-resistant plate frame 4 Residual soil 5 Continuous wall 6 Horizontal beam 7 Flooring level 8 Residual soil 11 Existing underground outer peripheral wall 11a Lower end part 11b Inner part 12 Chemical solution 12a Water-stopping chemical solution Layer 12b Diffusion range 13 Boring machine 14 Double pipe rod 15 Drilling part 17, 17a Existing underground frame 18 Pressure plate frame 19 Horizontal beam 20 Concrete wall 20a Lower end 21 Flooring level 22 Remaining soil 23 Backfill

Claims (5)

When the groundwater level is higher than the level of new building flooring, it is a mountain retaining method of construction that constructs a new building by excavating the ground deeper than the lower end of the existing underground outer peripheral wall,
Along the outside of the existing underground outer peripheral wall, a water-stopping chemical solution is formed by injecting a water-stopping chemical solution from above to the rooting position from above the lower end of the existing underground outer peripheral wall,
Pre-dismantling the existing underground structure by leaving the existing underground outer peripheral wall and the pressure plate frame,
The construction of the horizontal beam inside the existing underground outer peripheral wall and the dismantling of the existing underground frame are repeated sequentially from the top,
Excavating the inside of the water-stopping chemical solution layer at the lower part of the existing underground outer peripheral wall,
A mountain retaining method characterized in that a concrete wall for a mountain retaining wall is formed below the excavated underground outer peripheral wall. When the groundwater level is higher than the level of new building flooring, it is a mountain retaining method of construction that constructs a new building by excavating the ground deeper than the lower end of the existing underground outer peripheral wall,
Pre-dismantling the existing underground structure by leaving the existing underground outer peripheral wall and the pressure plate frame,
Along the outside of the existing underground outer peripheral wall, a water-stopping chemical solution is formed by injecting a water-stopping chemical solution from above to the rooting position from above the lower end of the existing underground outer peripheral wall,
The construction of the horizontal beam inside the existing underground outer peripheral wall and the dismantling of the existing underground frame are repeated sequentially from the top,
Excavating the inside of the water-stopping chemical solution layer at the lower part of the existing underground outer peripheral wall,
A mountain retaining method characterized in that a concrete wall for a mountain retaining wall is formed below the excavated underground outer peripheral wall. 3. The mountain fastening method according to claim 1, wherein the injection of the chemical solution is performed by drilling from the ground to a required depth using a double tube rod. 3. The mountain fastening method according to claim 1, wherein the injection of the chemical solution is performed in a staggered manner along the outside of the existing underground outer peripheral wall. The excavation of the lower part of the lower end part of an existing underground outer peripheral wall and formation of a concrete wall are performed for every required width along the horizontal direction of an outer peripheral wall, The mountain fastening method of Claim 1 or 2 characterized by the above-mentioned.

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