JP3656437B2 - Soil cement composite wall and its construction method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite soil cement wall and its construction method, and in particular, functions as a pile against the axial force of the outer periphery of a building, such as an underground continuous wall, so that it can also be applied to the reverse casting method and the new underground construction method. The present invention relates to a composite soil cement wall and its construction method.
[0002]
[Prior art]
The underground continuous wall constructed with large-scale mechanical equipment and many artificial pieces is integrated with the supporting pile, the retaining wall against the earth water pressure, the water blocking wall, the seismic wall that handles the in-plane shear force, and the post-casting frame. It exhibits various functions as a synthetic wall that can resist in-plane and out-of-plane forces.
For this reason, although there is an opportunity to examine the continuous underground wall at the planning stage at sites that employ special construction methods such as large-scale underground structures and reverse driving methods, the cost of continuous underground walls is high, In the field where it is not necessary to fully exhibit the above functions, the adoption is abandoned from the viewpoint of cost, and finally, a low-cost soil cement water blocking wall is often used.
[0003]
Soil cement water barrier wall has high water-stopping performance by excavating and kneading the ground to a predetermined depth while injecting cement milk with a multi-axis excavator, building a core material such as H steel after hardening the auger, and hardening it It is a construction method that can construct a retaining wall. However, since this method is positioned as a temporary mountain-clamping method, there is not a system in which management is sufficiently performed like the main body structure, so there is one aspect where sufficient quality and accuracy are not ensured. It was seen.
[0004]
In particular, for core materials, since a single core material is generally inserted into the excavation hole by its own weight, its position and direction are often not set correctly, and excavation is progressing as underground work progresses. The core material, which should be aligned at regular intervals, may appear apart due to misalignment or twisting, and the retaining wall may bite into the rear structure of the main body structure. In some cases, cracks occurred at large intervals, resulting in water leakage.
[0005]
In recent years, in order to shorten the work period and to secure a working space for construction, there are increasing cases of using the back-strike method and the new underground construction method, but the axial force (weight) of the outer wall of the basement is received by the retaining wall. Although it is reasonable to omit the structural pillars, the soil cement water barrier is not originally assumed as a mountain retaining wall from the earth force of horizontal force. Since it was not a construction method for treating the load, it could not be adopted for these construction methods, and another costly construction method had to be adopted.
[0006]
Attempts have also been made to join the main beam by welding a bracket to the core of the soil cement column.
As shown in FIG. 11, this means hangs out the flange surface 31 of the core material 30 during construction of the basement floor, welds the bracket 32 to the flange surface 31 of the core material, and passes the through beam 33 parallel to the outer wall surface to the bracket. Attach this beam to receive the main beam 34 orthogonal to the soil cement column.
However, this method has the following problems, and the expected result cannot be obtained.
(1) On-site welding of the bracket is butt welding that generates a large pulling force on the upper flange, so that problems remain in the reliability of the welded portion and the safety during construction.
(2) It is necessary to lay the bracket from the core material and the above-mentioned through beam. Since these are installed in the main body structure, the number of parts increases and interferes with the main beam of the main beam and the wall of the underground outer wall. .
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned problems, and has been improved, and is integrated as a receiving material for a post-casting body by using a plurality of H steel cores of a soil cement water blocking wall as an integrated steel assembly. The purpose of the present invention is to provide a low-cost soil cement composite wall that can resist in-plane and out-of-plane forces as well as a continuous underground wall.
[0008]
[Means for Solving the Problems]
The soil cement composite wall according to the present invention has an assembly steel material in which a plurality of core materials are integrated as a core material of a soil cement column array, and a gusset plate provided on the assembly steel material and a main beam are coupled to each other. It is characterized by being constructed by placing concrete in the frame. Support piles, mountain retaining walls and water blocking walls against earth and water pressure, seismic walls that handle in-plane shear forces, and post-casting to resist in-plane and out-of-plane forces. It is integrated with the housing and exhibits various functions that can resist in-plane and out-of-plane forces.
[0009]
Specifically, the assembly steel material is integrated with a channel steel material in which a plurality of H steel core materials are passed between H steel flanges at a predetermined interval, thereby improving the position setting and construction accuracy of the core material and changing the plan of the main body structure. And freedom of construction.
[0010]
In addition, the method for constructing a soil cement composite wall according to the present invention excavates a plurality of continuous soil cement column holes, and integrates a plurality of core members into the column hole formed by mixing cement milk and excavated soil. The assembled steel material is suspended, and the soil cement is hardened while holding it in place to form a soil cement water barrier wall. It is characterized by laying a gusset plate on the inner surface of the steel plate, connecting the main beam to the gusset plate, and then placing concrete on the assembled steel and the beam, and putting the concrete together. As a result, the assembly steel material can be smoothly held and suspended from the excavation hole, and the gusset plate is laid on the web surface of the channel steel material to improve the flexibility in constructing the main body structure.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The soil cement composite wall according to the present invention is constructed by arranging an assembled steel material in which a plurality of core materials are integrated as a core material of a soil cement column array, constructing a soil cement water blocking wall, and gusseting the assembled steel material protruding the inner surface. After laying the plate and joining it with the main beam, it is constructed by placing concrete frame. Therefore, the soil cement composite wall according to the present invention receives horizontal soil pressure as a retaining wall, and at the same time bears the vertical axial force generated at the outer periphery of the building as a support pile, so that the in-plane and out-of-plane forces of the waterproof wall Can resist.
[0012]
A soil cement composite wall and its construction method according to the present invention will be described below with reference to the drawings.
FIG. 1 is a cross-sectional side view of a soil cement composite wall according to the present invention prior to placing concrete. In the figure, 1 is a soil cement column array, 2 is the ground outside the soil cement column, and 3 is an excavated ground inside. In the soil cement column 1, an assembled steel material 4 in which a plurality of core materials are integrated as a core material is arranged, and a channel steel material 5 arranged between the core materials joins the core materials to each other on the web surface. The gusset plate 6 is laid by welding. Further, a flat bar 7 is welded for reinforcement at a position corresponding to the channel steel 5 to strengthen the integration between the cores. The gusset plate 6 is joined by receiving the main beam 8 of the main body structure and is not shown in the drawings, but the concrete for the main body structure is cast in accordance with a normal construction procedure, and the soil cement column Is constructed as a synthetic wall integral with the body structure.
[0013]
In order to bear the axial force in the vertical direction corresponding to the continuous underground wall, the soil cement column 1 employs an assembled steel material in which a plurality of core materials are integrated, and measures are also taken at the tip.
The tip 9 of the excavation hole is excavated to the ground having sufficient strength to support the weight of the outer peripheral portion of the building in consideration of the peripheral surface frictional resistance of the hole wall to form the support base 10. From the tip 9 of the excavation hole to the tip of the core material is configured as a pile root consolidation portion 11, the strength of the soil cement is 20 kg / cm 2 or more, and the core material embedding portion 12 has a diameter of the excavation hole of 2 from the tip of the core material. The structure is maintained with a double engagement depth or more, and the strength of the soil cement is also 20 kg / cm 2 or more. For this reason, when the front-end | tip of a core material has reached even the front-end | tip vicinity of a digging hole, it is natural that both parts can be combined.
[0014]
Moreover, in the core material embedding part 12 near the front end of the core material, a stud diver or a wing plate is used in order to secure the adhesion strength between the steel material and the soil cement even if the embedding length is small.
Furthermore, the use of the assembled steel material 4 and the gusset plate 6 improves the problems of the conventional method, and reduces the number of parts and increases the efficiency of on-site construction. Safety can be ensured.
[0015]
2 and 3 are cross-sectional views taken along the lines II and Rolo in FIG.
In FIG. 2, the soil cement column 1 is scraped and exposed as a suspended surface 13 along with excavation of the inner ground 3. At this time, the flange surface 15 of the core material 14 and the web surface 16 of the channel steel material 5 are suspended. It is taken and cleaned to suit welding and concrete casting.
The web surface 16 of the channel steel material 5 is limited in the vertical width as shown in the figure, but since there is no member that hinders the gusset plate 6 in the horizontal direction, Gusset plates can be laid at any position.
For this reason, when the main beam is arranged along the plan of the main body structure, it is possible to easily fix and fix the gusset plate at a predetermined position even if a slight deviation occurs in the position of the core member 14. It is possible, and the gusset plate after laying and the main beam can be simply joined.
[0016]
FIG. 3 is a sectional view showing an arrangement state of the assembled steel materials.
An assembly steel material 4 in which three core materials 14 are integrated is arranged in a soil cement column row hole constructed by a three-axis excavator, and a channel steel material 5 and a flat steel 7 are arranged at predetermined intervals between the core materials. It is welded with.
After the construction of the soil cement column 1, the inner surface of the assembled steel material 4 is exposed and exposed so that it can be easily machined.
A gusset plate 6 is welded to a web surface 16 of the channel steel material 5 at a predetermined position, and a main beam 8 is coupled thereto.
[0017]
By the way, it is well known that the mountain retaining stress is generally larger in the lower portion and decreased in the upper portion. Accordingly, it has been naturally recognized that the upper supporting force is made smaller with respect to the lower portion. However, in the conventional soil cement column row, a single core member is arranged, so that the core member is placed in the middle portion. It was impossible to make changes, and members of the same size were used without stopping.
Even in the above-described embodiment, the lengths of the core materials constituting the assembled steel material have been described as being the same in accordance with the conventional policy, but according to the present invention, a plurality of core materials are integrated with each other. Even if there is a short core material, other core materials are supported in the middle part, so the core material arranged in the middle of the three core materials is configured with the upper part missing. The length of the core material can be selected according to the stress to be supported, which greatly contributes to cost.
[0018]
In the above embodiment, the state of being integrated with the main body structure in the underground structure portion has been described, but the core material constituting the soil cement composite wall is set in advance to a length extending on the ground surface, It is also possible to couple together with the ground part of the main body structure.
FIG. 4 shows an embodiment in which the soil cement synthetic wall according to the present invention and the frame of the main structure are integrated, and FIG. 4 (a) is a plan view with a part missing, FIG. 4 (b). FIG. 4A is a cross-sectional view taken along the arrow II.
[0019]
In FIG. 4A, the core top 18 of the assembled steel material is exposed on the ground surface from the upper end of the soil cement composite wall 20, and the outer peripheral beam 21 of the RC structure of the main body structure is disposed between the core tops. Thus, a state where they are integrally coupled is shown. A gibber stud or the like is previously planted in the upper core material of the assembled steel material, which is effective for receiving the weight of the frame.
As shown in FIG. 4B, the construction of the outer peripheral beam 21 is performed by welding the outer peripheral beam 21 of the RC structure between the core materials outside the assembled steel material 4 after the construction of the soil cement composite wall 20. Since these are joined together, gusset plates and horizontal steel materials can be omitted, which is advantageous in terms of cost.
[0020]
FIGS. 5-10 is a state diagram in each process for demonstrating the construction method of the soil cement composite wall by this invention.
FIG. 5 shows an assembled steel material that is assembled and integrated before construction.
As shown in the drawing, the assembled steel material 4 is composed of three single cores 14 made of H steel arranged at intervals corresponding to the pitch of the soil cement pillar row drilling holes, and between the cores, the main beams are arranged. The channel steel material 5 is welded in accordance with the planned laying interval, and the flat steel 7 is spread over each core material to a predetermined portion of the flange surface in order to ensure the strength of the assembled steel material 4 at a portion unrelated to the main beam. It is attached to a position and is configured integrally. As described above, the assembled steel material 4 is closely integrated with each other between the core materials, so that the core material 14 is disturbed apart at the time of construction or at the installation position of the soil cement water blocking wall, unlike the case where the core material 14 is alone. Without rotating and disturbing the fit, the construction efficiency can be improved and the construction accuracy can be improved.
As described above, each core member 14 is provided with a reinforcing member such as a stud dibel or an assembly member for reinforcing the bonding with the concrete at the core member embedded portion 12 or the top portion 18 or for assembling the outer peripheral portion. Reinforcing bars are properly arranged and planted.
[0021]
FIG. 6 shows a manufacturing process of the assembled steel material shown in FIG. 6A is a view as seen from the arrow of FIG. 5, and FIG. 6B is a view as seen from the arrow of FIG. 7A.
As shown in FIG. 6 (a), the ground structure of the assembled steel material 4 has the H steel core material 14 arranged at a predetermined interval on a work stand 22 that is installed long horizontally. Next, the channel steel material 5 is passed between the core materials 14 and fillet welded to the flange 23 and the web 24 of the H steel core material. At this time, the web surface 16 of the channel steel material 5 is the flange surface of the H steel core material. It is set to 15.
As shown in the cross-sectional view of FIG. 6B, the flat steel 7 is welded to the flange 23 opposite to the flange 23 to which the channel steel material 5 is welded so as to cover the entire core material at a position corresponding to the channel steel material 5. It is attached.
[0022]
FIG. 7 is a state diagram in which the assembled steel material is suspended in the excavation hole of the soil cement column array. A plurality of continuous soil cement columnar holes 25 are excavated on the ground for constructing the soil cement water blocking wall 1, and then the separately assembled assembly steel material 4 is lifted by a crawler crane or the like and suspended in the excavation holes 25. Go down. Since the excavation hole 25 is excavated to the depth of the support layer having sufficient strength to support the axial force of the soil cement composite wall using the soil cement excavator as described above, the construction efficiency of the excavation hole is high. The internal pressure during excavation is maintained, so there is little earth removal and it is economical.
Further, since the assembled steel material 4 is sufficiently integrated and built in the excavation hole, the suspension into the excavation hole 25 is smooth and the embedment accuracy can be maintained at a high level.
The core material 14 to be connected to the assembled steel material 4 does not need to match the number of drilling shafts of the soil cement excavator, and the number of core materials to be connected and the connection arrangement shape are determined based on the outer wall shape of the main body structure and the weight plan of the assembled steel material. Can be set.
[0023]
FIG. 8 is an elevation view (a) and a cross-sectional view (b) showing a suspended surface after the soil cement water blocking wall is constructed.
When the soil cement water blocking wall 1 is constructed, the ground 3 inside the water blocking wall is excavated, and along this excavation, the inner surface of the assembled steel material 4 is simultaneously lifted, and the main body structure of each core material The flange surface 15 on the side and the inner web surface 16 of the channel steel material are exposed, and surface cleaning on both sides is performed for subsequent construction.
[0024]
Since the strength of the soil cement is secured in the vicinity where the tip of the core material of the soil cement water blocking wall is embedded, the stress from the core material is smoothly transmitted to the soil cement column, and the tip of the core material The tensile split fracture of the wall occurring in the lower part is prevented.
Moreover, since the soil cement strength at the tip of the excavation hole is secured, the axial force of the soil cement composite wall is smoothly transmitted to the support ground, and the same support force as that of the continuous underground wall is maintained.
Further, since the channel steel material 5 has the member surface opposite to the exposed web surface 16 embedded in the soil cement, a high safety factor against rotation and bending torsional buckling of the assembled steel material including the core material. Is secured.
[0025]
FIG. 9 is an elevation view (a) and a cross-sectional view (b) showing a construction state of the assembled steel material.
The gusset plate 6 shown in the drawing is attached to a predetermined position in the horizontal direction on the surface of the channel steel material 5 by field welding so as to correspond to the position of the beam of the main body structure at the time of underground construction.
The construction accuracy of the assembled steel material 4 is significantly higher in the vertical direction than in the horizontal direction because it is easy to manage mechanically, and the position of the gusset plate 6 to be laid is almost deviated from the surface 16 of the channel steel material 5. Can be paid without.
[0026]
In addition, the fact that the gusset plate 6 can be laid at an arbitrary position of the channel steel material 5 regardless of the position of the core material 14 can easily cope with the change of the beam position in the main body structure, and the degree of freedom of the entire construction is improved. The construction period can be shortened in the construction process.
Furthermore, since welding of the gusset plate 6 is performed by fillet welding, it is possible to improve the reliability of on-site welding and the safety during construction, and the quality of the entire construction can be ensured.
[0027]
FIG. 10 is a cross-sectional view of a soil cement composite wall.
When the soil cement composite wall 20 is constructed by the reverse casting method, the ground 3 is excavated to squeeze out the flange surface of each core material and the inner web surface of the channel steel material, and then laid on the assembled steel material of the water stop wall. The main beam is fixed to the gusset plate, and then the slab, pillar, outer wall reinforcement and formwork are constructed, and the concrete is placed to construct the outer periphery of the underground structure.
Accordingly, the outer wall 26 of the underground structure is formed inside the soil cement composite wall 20 after construction, and the beam 27 received by the gusset plate of the assembled steel material supports the slab 28 of each underground floor as a beam of the underground structure. doing.
As is clear from the above explanation, the soil cement composite wall according to the present invention has a function as a support pile, and acts as a retaining wall / water blocking wall against soil water pressure, and at the same time as a seismic wall that processes in-plane shear force. It can be integrated with the post-casting frame to resist in-plane and out-of-plane forces, and can also be used for reverse casting methods and new underground construction methods.
[0028]
As described above, the present invention has been described in detail based on various embodiments. However, the soil cement composite wall according to the present invention and the construction method thereof are obtained by combining an assembled steel material in which a plurality of core materials are integrated into a core of a soil cement column. The present invention is characterized in that it is configured by placing a reinforced concrete of a main body structure by connecting a gusset plate provided on an assembled steel material and a main beam and placing the reinforced concrete. Of course, the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention.
[0029]
【The invention's effect】
The soil cement composite wall according to the present invention has an assembly steel material in which a plurality of core materials are integrated as a core material of a soil cement column array, and a gusset plate provided on the assembly steel material and a main beam are coupled to each other. A seismic wall that is constructed by placing concrete in the form of concrete, and is integrated with support piles as well as continuous underground walls, mountain retaining walls and water-stop walls against soil water pressure, and post-casting frames. It is possible to construct a variety of functions that can resist in-plane and out-of-plane forces at an overwhelmingly low cost, and demonstrates the effect that it can be adopted without using the true pillars in the reverse driving method and the new underground method.
[0030]
In addition, the integrated steel material prevents the core material from falling apart in the excavation premises, prevents biting into the underground structure, and keeps the core material spacing even to prevent cracks and water leakage. As a result, the bonding between the channel steel material and the soil cement is made dense, and the effect of suppressing the rotation and buckling of the core material is achieved.
[0031]
The construction method of the soil cement composite wall according to the present invention is an assembled steel material obtained by excavating a plurality of continuous soil cement column holes and integrating a plurality of core members into a column hole formed by mixing cement milk and excavated soil. The soil cement is hardened while holding it in place and the soil cement water barrier wall is constructed, and the inner surface of the assembled steel material is lifted along the ground excavation inside the water barrier wall, and then the inner surface of the assembled steel material It is characterized by laying a gusset plate on the surface, connecting the main beam to the gusset plate, and then placing concrete on the assembled steel and the beam, so that the construction efficiency of the excavator is improved It has the effect that the pile subsidence amount can be made high and the accuracy of building in the excavation hole can be increased to improve the frame accuracy at the underground construction stage. Moreover, since there is almost no earth removal, it is economical and can produce an effect friendly to the global environment.
[Brief description of the drawings]
FIG. 1 is a sectional side view of a soil cement wall according to the present invention. FIG. 2 is a sectional view of a soil cement wall. FIG. 3 is a sectional view of a soil cement water wall. FIG. 5 is a ground drawing of an assembled steel material employed in the present invention. FIG. 6 is a grounding process diagram of an assembled steel material employed in the present invention. FIG. 7 is a process of suspending the assembled steel material in a drilling hole. [Fig. 8] Fig. 9 is a drawing of the process of suspending the soil cement water barrier. [Fig. 9] is a drawing of the process of laying the gusset plate. [Fig. Construction drawing [Explanation of symbols]
1 Soil cement column (soil cement composite wall)
2 Outside ground of soil cement composite wall 3 Inside excavation ground of soil cement composite wall 4 Assembly steel material 5 Channel steel material 6 Gusset plate 7 Flat steel 8 Main beam 9 Tip of excavation hole 10 Support base 11 Pile consolidation part 12 Core material filling Insert part 13 Hanging surface 14 Steel core material 15 Flange surface 16 Web surface 18 Core material top portion 20 Soil cement composite wall 21 Peripheral beam 22 Work base 23 H Steel core flange 24 H Steel core web 25 Drilling hole 26 Outer Wall of Underground Structure 27 Beam of Underground Structure 28 Slab 30 Core Material 31 Flange Surface 32 of Core Material Bracket 33 Through Beam 34 Main Beam

Claims (3)

An assembly steel material in which a plurality of core materials are integrated is arranged as a core material of a soil cement column array, and a reinforced concrete of a main body structure is placed by connecting a gusset plate provided on the assembly steel material and a main beam. Soil cement composite wall. 2. The soil cement synthetic wall according to claim 1, wherein the assembled steel material is integrated by a channel steel material in which a plurality of H steel core materials are passed between the flanges of the H steel at a predetermined interval. While excavating a plurality of continuous soil cement column holes and assembling a steel assembly in which a plurality of core materials are integrated into the column hole obtained by kneading cement milk and excavated soil, The soil cement is hardened to form a soil cement water stop wall, the inner surface of the assembled steel material is suspended along the ground excavation inside the water stop wall, and then a gusset plate is laid on the inner surface of the assembled steel material, after by combining the設梁the gusset plates, construction methods features and to Luso yl cement synthesis walls that concrete is cast by placing a mold to assemble steel and beams.

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