JP4478615B2 - Steel pipe sheet pile wall construction method - Google Patents

Description

  The present invention relates to a steel pipe sheet pile wall construction method for constructing a retaining wall and a foundation using a steel pipe sheet pile.

Conventionally, as a method of constructing a steel pipe sheet pile wall, a hole is excavated in advance in the ground, and the steel pipe sheet pile is built in the hole while being connected via a connecting portion. There is one that sequentially repeats the operation of injecting a hardening material around the steel pipe sheet pile inserted (see, for example, Patent Documents 1, 2, or 3).
Japanese Patent No. 2935632 Japanese Patent No. 2935633 Japanese Patent No. 2935634

  However, in the conventional method, since the operations of drilling holes, installing steel pipe sheet piles, and injecting hardened material are performed on each steel pipe sheet pile, the time required for construction per steel pipe sheet pile has been increased. . In addition, in order to build steel pipe sheet piles while connecting them, the hardened material around the previously built steel pipe sheet piles must be excavated, and the hardened material must be reinjected into the excavated portion, resulting in the generated residual soil There was also a problem that the amount of the curing material used was large.

  The subject of this invention is shortening the construction time per steel pipe sheet pile in the above steel pipe sheet pile wall construction methods. Moreover, it is to reduce the amount of residual soil generated by excavation and the amount of hardened material used around the steel pipe sheet pile.

  In order to solve the above-mentioned problems, the invention described in claim 1 is a steel pipe sheet pile wall construction method for constructing a continuous wall by connecting steel pipe sheet piles, and for example, as shown in FIGS. An excavation process for excavating a plurality of holes 5b, 5c in the ground from the steel pipe sheet pile 1a embedded in the ground in the construction direction, and the adjacent steel pipe sheet piles 1a, 1b 1c, a plurality of steel pipe sheet piles 1b and 1c are built in the plurality of holes 5b and 5c, respectively, and the plurality of holes 5b and 5c are inserted into the joints (male joint 2 and female joint 3). And a filling step of filling a filler 7 around the plurality of steel pipe sheet piles 1b and 1c built therein.

  The work of excavating the hole 5 in the ground, the work of installing the steel pipe sheet pile 1 in the excavated hole 5, and the work of filling the filler 7 around the steel pipe sheet pile 1 built in the hole 5 are as conventional. In addition, it is possible to reduce the construction time per one steel pipe sheet pile 1 by performing a plurality of pipe sheet piles instead of one by one. Further, when excavating the plurality of holes 5b and 5c in the ground, the ground is dug between the plurality of excavated holes 5b and 5c, or the filler 7 is filled with duplication. Therefore, it is possible to reduce the amount of remaining soil generated by excavation and the amount of filler 7 that is filled around the steel pipe sheet piles 1b and 1c.

  The invention according to claim 2 is the steel pipe sheet pile wall construction method according to claim 1, for example, as shown in FIGS. 1 to 6, the steel pipe sheet pile 1a embedded in the ground in advance after the excavation step. The above-mentioned joints (male joint 2 and female joint 3) are used as a guide to excavate the ground on the side of the joint and to provide a modified excavation process for correcting the hole 5a excavated adjacent to the steel pipe sheet pile 1a. Features.

  In this way, using the joint of the steel pipe sheet pile 1a previously embedded in the ground as a guide, the ground on the side of the joint is excavated, and the hole 5a excavated adjacent to the steel pipe sheet pile 1a is corrected. Thus, it is possible to facilitate the erection of the adjacent steel pipe sheet pile 1a while preventing breakage of the joint. And since the work of this correction excavation is only the hole 5b excavated adjacent to the steel pipe sheet pile 1a previously embedded in the ground among the plurality of holes 5b, 5c excavated in the ground, The construction time per one steel pipe sheet pile 1 can be shortened.

  The invention according to claim 3 is the steel pipe sheet pile wall construction method according to claim 1 or 2, wherein, for example, as shown in FIGS. 1 to 6, the excavation step is preceded by the plurality of holes 5b and 5c. Then, excavation is performed from the even-numbered holes 5c counted from the side of the steel pipe sheet pile 1a embedded in the ground.

  Thus, by excavating from the even-numbered holes 5c from the steel pipe sheet pile 1a side previously embedded in the ground, both sides of the position where the even-numbered holes 5c are excavated are previously embedded in the ground. There is no filler 7 or excavated hole around the steel pipe sheet pile 1a. For this reason, since the excavation work of the hole 5c can be performed without being affected by them, the construction accuracy can be improved.

  The invention according to claim 4 is the steel pipe sheet pile wall construction method according to any one of claims 1 to 3, for example, as shown in FIGS. 1 to 6, the plurality of steel pipe sheet piles 1b in the erection step. 1c, it is built from the even-numbered steel pipe sheet pile 1c counting from the steel pipe sheet pile 1a side previously embedded in the ground.

  Thus, the steel pipe sheet pile built in the both sides of the position which builds in the even-numbered steel pipe sheet pile 1c by building in from the even-numbered steel pipe sheet pile 1c from the steel pipe sheet pile 1a side previously embedded in the ground. There is no. For this reason, since the construction work of the steel pipe sheet pile 1c can be performed without being influenced by the joint, the construction accuracy can be improved.

  According to the present invention, in a steel pipe sheet pile wall construction method for connecting steel pipe sheet piles to construct a continuous wall, a hole excavation work into the ground, a steel pipe sheet pile installation work in this hole, and the circumference of this steel pipe sheet pile By performing a plurality of steel pipe sheet piles filling work, the time required for construction per steel pipe sheet pile can be shortened as compared with the prior art. In addition, since excavation of a plurality of holes is performed in the same excavation process, the amount of residual soil generated by excavation and the amount of filler used to fill the periphery of the steel pipe sheet pile can be reduced as compared with the prior art.

  Furthermore, using the joint of the steel pipe sheet pile previously embedded in the ground as a guide, excavating the ground on the side of this joint and performing a modified excavation to correct the hole drilled adjacent to this steel pipe sheet pile Is desirable. Even in this case, the correction excavation work is only a hole excavated adjacent to the steel pipe sheet pile previously embedded in the ground out of a plurality of holes excavated in the ground, so one steel pipe sheet pile The time required for the construction can be shortened.

  In addition, if excavating from the even-numbered holes from the side of the steel pipe sheet pile previously embedded in the ground in excavation work, the filler around the steel pipe sheet pile previously embedded in the ground or the holes already drilled It is possible to improve the construction accuracy of the hole excavation without being affected by the above.

  In addition, if the steel pipe sheet pile is installed from the even numbered steel pipe sheet pile from the side of the steel pipe sheet pile previously embedded in the ground in the construction work of the steel pipe sheet pile, the steel pipe sheet pile is not affected by the joint of the already built steel pipe sheet pile. The construction accuracy of erection can be improved.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, in the present embodiment, the steel pipe sheet pile wall construction method of the present invention is applied to the construction of a retaining wall (continuous wall) by connecting and embedding steel pipe sheet piles 1 in the ground. .

First, the steel pipe sheet pile 1 used for this Embodiment is demonstrated.
As shown in FIG. 1, a steel pipe sheet pile 1 is a steel pipe main body provided with a male joint 2 and a female joint 3. The male joint 2 and the female joint 3 are long members along the longitudinal axis of the steel pipe body. Then, by engaging the male joint 2 of the steel pipe sheet pile 1 (for example, the steel pipe sheet pile 1c) with the female joint 3 of the steel pipe sheet pile 1 (steel pipe sheet pile 1b) adjacent thereto, the adjacent steel pipe sheet pile 1 (steel pipe sheet pile 1c and Steel pipe sheet piles 1b) can be connected to each other.

  The male joint 2 has a pair of angles arranged in parallel with the tips facing outward, and the female joint 3 has a pair of angles arranged with the tips facing each other. In addition, the structure of a joint, a shape, etc. are not limited to this, It can set arbitrarily. For example, the male joint 2 may be made of T-shaped steel. The joints only need to be able to engage with each other, and are not necessarily a pair of males and females.

  Here, in the steel pipe sheet pile 1 to be built, in the steel pipe sheet pile 1c at a position away from the preceding steel pipe sheet pile side, the joint protective material 4 is attached so as to surround the female joint 3. Similarly, as shown to Fig.6 (a), the joint protective material 4 is attached to the female joint 3 of the preceding steel pipe sheet pile 1a in the embedded state.

  The joint protective material 4 closes the slit of the female joint 3 so that the filler 7 filling the periphery of the steel pipe sheet pile 1 does not enter the female joint 3. For example, the rubber sheet 4a is installed so as to surround the female joint 3, a longitudinal hollow space is formed inside the rubber sheet 4a, and slag sand 4b is packed therein.

Next, the procedure of the steel pipe sheet pile wall construction method in the present embodiment will be described.
As shown in FIGS. 1-6, the steel pipe sheet pile wall construction method in this Embodiment is roughly comprised including the excavation process mentioned later, a correction excavation process, the erection process, and the filling process. Then, these steps are sequentially repeated as one cycle to construct a retaining wall.

  First, in the excavation process, as shown in FIG. 1, two steel pipe sheet piles 1a (hereinafter referred to as a preceding steel pipe sheet pile 1a) embedded in the ground in advance are arranged in the direction of construction of the retaining wall. Two holes 5b and 5c for embedding the steel pipe sheet piles 1b and 1c, respectively, are excavated in the ground. These holes 5 b and 5 c have a predetermined diameter including the female joint 3 and the male joint 2 of the steel pipe sheet pile 1.

  Here, as shown in FIGS. 2 and 3, the two holes 5b and 5c are first excavated from the second hole 5c counted from the preceding steel pipe sheet pile 1a side, and then counted from the preceding steel pipe sheet pile 1a side. That is, the hole 5b adjacent to the hole 5a excavated in the preceding steel pipe sheet pile 1a is excavated.

  Further, as shown in FIG. 6 (a), when excavating the first hole 5b, at a position slightly away from the female joint 3 so as not to accidentally break the female joint 3 of the preceding steel pipe sheet pile 1a. Then, excavation is performed by overlapping the hole 5a in the preceding steel pipe sheet pile 1a and the second hole 5c. At this time, as can be seen from the fact that the excavation line of the hole 5b extends to the filler 7, at the same time as excavating the ground, a part of the filler 7 filled around the preceding steel pipe sheet pile 1a is also excavated.

  Excavation of the hole 5 is performed using an all casing method, for example, as shown in FIGS. 2 (a) and 3 (a). Specifically, the all-swivel casing construction machine 8 is installed at the excavation position and rotated while the casing tube 9 is press-fitted, thereby preventing the collapse of the hole wall and exhausting the inside with an excavator such as a hammer grab 11. While soiling, the casing tubes 9 are successively added and buried to a predetermined depth.

  Note that the tip of the casing tube 9 during excavation always precedes the excavation depth in order to protect the hole wall. In addition, the water level in the hole during excavation is adjusted so that it does not always fall below the groundwater level by pouring water into the hole 5 in order to prevent boiling and heaving. Moreover, you may use together the earth drill 12 for excavation.

  After excavating to a predetermined depth, as shown in FIGS. 2 (b) and 3 (b), the casing tube 9 is filled with a bentonite stabilizing solution, a polymer stabilizing solution, etc. as a non-curing type stabilizing solution. 9 is pulled out and the excavation of the hole 5 is completed.

  Next, after the excavation process, in the modified excavation process, the ground on the side of the female joint 3 is excavated using the female joint 3 of the preceding steel pipe sheet pile 1a as a guide, and adjacent to the hole 5a of the steel pipe sheet pile 1a. The drilled hole 5b is corrected.

  As shown in FIG. 6B, the position of the hole 6 for correction excavation is slightly closer to the joint side than the excavation line of the hole 5b excavated adjacent to the hole 5a in the preceding steel pipe sheet pile 1a. Further, the diameter of the excavation is slightly reduced in order to avoid excessive excavation (the excavation line for the correction excavation is indicated by a dotted line in the figure). As a result, the first hole 5b is not a perfect circle but has a shape bulging slightly.

  In addition, as can be seen from the fact that the drilling line of the hole 6 for the modified excavation extends to the joint protective material 4 of the steel pipe sheet pile 1a, in this modified excavation process, a part of the joint protective material 4 is excavated simultaneously with excavating the ground. To do.

  For example, as shown in FIG. 3C, the correction excavation is performed using an earth drill 13 having a guide mechanism that can slide up and down by sliding inside or outside the female joint 3 of the steel pipe sheet pile 1a. Specifically, a rotary support 13b is attached to the tip of the kelly bar 13a to cut the ground, and then a drilling bucket (not shown) is attached instead of the rotary support 13b to discharge the cut earth and sand. .

  In excavation, since the hole 5 is filled with a bentonite stabilizing solution, a polymer stabilizing solution, or the like in the excavation process, the wall of the hole 5 is prevented from collapsing. At the same time, the inside of the female joint 3 is also cleaned.

  Next, after the correction excavation process, in the erection process, as shown in FIG. Each is built in 5c.

  As shown in FIGS. 6C and 6D, of the two steel pipe sheet piles 1b and 1c, first, the second steel pipe sheet pile 1c counting from the preceding steel pipe sheet pile 1a side is built, and then the preceding steel pipe sheet pile 1a. The steel pipe sheet pile 1b adjacent to the first, ie, the preceding steel pipe sheet pile 1a, is built in from the side. That is, the second steel pipe sheet pile 1c is built so that the female joint 3 and the male joint 2 are in a predetermined position. The first steel pipe sheet pile 1b is built with its male joint 2 in the position of the female joint 3 of the preceding steel pipe sheet pile 1a and its female joint 3 in the position of the male joint 2 of the second steel pipe sheet pile 1c. It is.

  For example, as shown in FIG. 4, the steel pipe sheet pile 1 is hung by placing the steel pipe sheet pile 1 above the hole 5 with a crane, sequentially welding the steel pipe sheet pile 1, and gradually lowering it. It is done by building to the depth. When the first steel pipe sheet pile 1b is installed, the female joint 3 of the preceding steel pipe sheet pile 1a and the male joint 2 of the second steel pipe sheet pile 1c are lowered as a guide. Thereby, the steel pipe sheet pile 1a, the steel pipe sheet pile 1b, the steel pipe sheet pile 1b, and the steel pipe sheet pile 1c are connected to each other by fitting their joints.

  A joint protective material 4 is attached to the female joint 3 of the second steel pipe sheet pile 1c. For example, the joint protective material 4 is prepared by attaching a rubber sheet 4a in advance before the steel pipe sheet pile 1c is built, and stuffing the slag sand 4b into the rubber sheet 4a and the female joint 3 after the steel pipe sheet pile 1c is built. Formed with.

  Next, after the erection process, in the filling process, as shown in FIG. 6 (e), the filler 7 is placed around the two steel pipe sheet piles 1b and 1c built in the two holes 5b and 5c. Fill. The filler 7 is also filled between the joints 3 and 4 fitted in the steel pipe sheet piles 1a, 1b and 1c.

  Prior to filling, as shown in FIG. 5 (a), the steel pipe sheet piles 1b and 1c are filled with earth and sand 14 by a backhoe 15 to a predetermined depth, and filled into the steel pipe sheet piles 1b and 1c. Prevents the material 7 from getting around.

  For example, as shown in FIG. 5B, the filling material 7 is filled by connecting the injection pipe 14 around the steel pipe sheet piles 1b and 1c, the steel pipe sheet pile 1a and the steel pipe sheet pile 1b, and the steel pipe sheet pile 1b and the steel pipe sheet pile 1c. It arrange | positions between the male joint 2 and the female joint 3, and it inject | pours through the injection | pipe piping 14 with a pressure pump, and it carries out. While the filling material 7 is being poured, the height of the casting is measured and managed so that the drop does not become large.

  As the filler 7, for example, fluidized soil is used. The filler 7 is not limited to fluidized soil, and may be a material having a predetermined strength and water-stopping property, such as bentonite mortar, normal mortar, or concrete.

  And the filling work is complete | finished by filling the filler 7 to the upper end part around the steel pipe sheet piles 1b and 1c, and backfilling the earth and sand 14 to the upper end part in the steel pipe sheet piles 1b and 1c.

  Hereinafter, as shown in FIG. 1, holes 5d and 5e are excavated in the ground, steel pipe sheet piles 1d and 1e are built, and the work of filling the filler 7 is repeated in the same process as described above, and further necessary. The retaining wall having a desired length is constructed by repeating the process only in order.

  According to the present embodiment, the work of excavating the hole 5 in the ground, the work of installing the steel pipe sheet pile 1 in the excavated hole 5, the filler 7 around the steel pipe sheet pile 1 built in the hole 5. Since the work of filling is not performed one by one for the steel pipe sheet pile 1 as in the prior art, but is performed two by two, the construction time per one steel pipe sheet pile 1 can be shortened. Moreover, when excavating the two holes 5b and 5c in the ground, the ground is dug between the two excavated holes 5b and 5c, or the filler 7 is filled with duplication. Therefore, it is possible to reduce the amount of remaining soil generated by excavation and the amount of filler 7 that is filled around the steel pipe sheet piles 1b and 1c.

  Further, since the correction excavation work is only the hole 5b excavated adjacent to the hole 5a in the preceding steel pipe sheet pile among the plurality of holes 5b and 5c excavated in the ground, one of the steel pipe sheet piles 1b and 1c is required. The construction time per book can be shortened.

  Further, by excavating from the second hole 5c from the preceding steel pipe sheet pile 1a side, the excavation work of the hole 5c can be performed without being affected by the filler 7 around the preceding steel pipe sheet pile 1a. Can be improved.

  Moreover, since the construction work of the steel pipe sheet pile 1c can be performed without being influenced by the joint of the steel pipe sheet pile 1 already built by building from the second steel pipe sheet pile 1c from the preceding steel pipe sheet pile side, Construction accuracy can be improved. Moreover, since the 1st steel pipe sheet pile 1b built adjacent to the preceding steel pipe sheet pile 1a is guided by the joint of both sides, it can be built stably without wobbling.

  And since the female joint 3 of the said 1st steel pipe sheet pile 1b does not need the role as a guide for correction | amendment excavation, it is provided along the longitudinal axis of the steel pipe sheet pile 1b only in the part by which water-blocking performance is requested | required. It only has to be. Similarly, the male joint 2 of the 2nd steel pipe sheet pile 1c should just be provided only in the part corresponding to the female joint 3 of the said 1st steel pipe sheet pile 1b.

  As described above, it is possible to improve the construction accuracy of the entire retaining wall and efficiently construct the retaining wall to reduce the construction cost.

  In the above embodiment, the number of holes 5 to be excavated in one excavation process is two, but the present invention is not limited to this, and according to construction conditions, etc., the number of holes 5 is three or more. Also good. Similarly, although the number of the steel pipe sheet piles 1 built in one erection process was two, it is good also as three or more. Here, the number of constructions is set according to the construction conditions such as the soil quality, the diameter and depth of excavation of the hole 5, and each process of excavation, correction excavation, erection and filling work is completed in one day. A number that is possible is desirable. Moreover, although the drilling order of the holes and the order of installing the steel pipe sheet piles are the second and first orders from the preceding steel pipe sheet pile side, the first and second orders may be reversed. In addition, when the number of holes and steel pipe sheet piles is 3 or more, construction may be performed in the order of even number and odd number from the preceding steel pipe sheet pile side, and vice versa. Of course, it can be constructed in these other orders. In addition, it is needless to say that specific detailed structures and the like can be appropriately changed.

It is a top view which shows the construction state of the steel pipe sheet pile wall of one Embodiment to which this invention is applied. It is sectional drawing for demonstrating the construction procedure, and shows a part of excavation process. It is sectional drawing for demonstrating the construction procedure, and shows a part of excavation process and a correction excavation process. It is sectional drawing for demonstrating the construction procedure, and shows the construction process of a steel pipe sheet pile. It is sectional drawing for demonstrating the construction procedure, and shows a filling process. It is a top view for demonstrating the construction procedure of a steel pipe sheet pile.

Explanation of symbols

1, 1a, 1b, 1c, 1d, 1e Steel pipe sheet pile 2 Male joint 3 Female joint 4 Joint protective material 5, 5a, 5b, 5c, 5d, 5e Hole 6 (Modified excavation)
7 Filler

Claims (4)

A steel pipe sheet pile wall construction method that connects steel pipe sheet piles to build a continuous wall,
A drilling process for excavating a plurality of holes in the ground to embed a plurality of steel pipe sheet piles in the construction direction from a steel pipe sheet pile previously embedded in the ground;
An erection process of building the plurality of steel pipe sheet piles in the plurality of holes while fitting the joints of adjacent steel pipe sheet piles,
A steel pipe sheet pile wall construction method, comprising: a filling step of filling a filler around the plurality of steel pipe sheet piles built in the plurality of holes.   After the excavation step, the steel pipe sheet pile joint previously embedded in the ground is used as a guide, the ground on the side of the joint is excavated, and the hole excavated adjacent to the steel pipe sheet pile is corrected. The steel pipe sheet pile wall construction method according to claim 1, further comprising an excavation process.   3. The steel pipe sheet pile wall construction according to claim 1, wherein, in the excavation step, excavation is performed from an even-numbered hole counted from the steel pipe sheet pile side embedded in the ground in advance. Construction method.   It builds from an even-numbered steel pipe sheet pile counted from the steel pipe sheet pile side previously embedded in the ground among the plurality of steel pipe sheet piles in the erection step. Steel pipe sheet pile wall construction method according to item.

Images