JP5360658B2 - Retaining wall made of precast concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retaining wall using precast concrete members, which facilitates and assures connecting concreate units of a wall which are disposed on and extended from each other and also facilitates and assures sealing water through the wall. <P>SOLUTION: In the precast concrete member 1, a cross section is formed into an H-shape by a web 2 and slender rectangular flanges 3 parallel to each other; a bulkhead 5 is integrally provided between both the flanges; the web is not provided on a leading end side with respect to the bulkhead on the furthest end side at each of both ends; only the leading end is protruded; and a flange extension piece is provided. The plurality of precast concrete members 1 are stacked in such a manner that the width direction of the flange 3 is set vertical, and connected and fixed together. The length of the connected and fixed precast concrete members 1 is set as one unit so as to form a unit concrete wall body A. The plurality of unit concrete wall bodies A are arranged and installed in such a manner as to continue in its horizontal length direction; and a solidified column body 25 is formed by cast-in-place using a cement-based solidification material is formed in a connecting portion space opened in a communicating manner in a vertical portion surrounded by the flange extension piece formed between the ends of the adjacent unit concrete wall bodies A and a bulkhead flange at the leading edge. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention is a retaining wall for preventing the collapse of the vertical ground surface when excavating the ground surface, for example, to form an underground space, and excavating and forming the retaining wall construction space from the ground surface in advance, The present invention relates to a retaining wall constructed by a precast member in the space.

  In general, as a retaining wall by a precast concrete member when a retaining wall is formed in the ground, and then an underground space is formed with the retaining wall protecting the vertical ground surface, The H-type PC piles are arranged side by side and excavated and pressed into the ground, and a concrete wall is constructed by placing concrete between the flanges of adjacent H-type PC piles. However, there is a structure in which a space is formed by excavating the front side of the retaining wall, and the retaining wall is protected by the retaining wall (for example, Patent Document 1).

  In addition, there is one that has strengthened the integration between sheet piles by inserting a PC tension material in the horizontal direction across the H type PC pile formed by driving in the vertical direction and tensioning it (for example, patent) Reference 2).

  Furthermore, there is a construction in which underground walls are formed by using underground walls by constructing underground walls by placing precast concrete members that are long in the horizontal direction and dropping them into the ground (Patent Document 3).

Japanese Patent No. 3896351 JP 2006-1112045 A Japanese Patent Publication No. 4-32172

  The above-mentioned method of driving the H-shaped precast concrete member upright can use a long member as long as 10 m or more by applying prestress in the vertical direction, and can increase the bending strength.

  However, when there is an obstacle on the ground such as under an elevated road and there is no space for standing a long precast concrete member, there is a problem that the construction is difficult.

  Moreover, in the conventional construction method shown in the above-mentioned Patent Document 3, although a horizontally long precast concrete member is used, it is intended to be used as an underground wall of an underground structure. It is not used as a retaining wall for passages and waterways for intersections and through-passes, and the precast concrete member used is a vertical space where the front and rear wall plates are partitioned by vertical partition walls, and the top and bottom are open The upper and lower precast concrete members are connected by inserting the reinforcing bars into the reinforcing bar embedding holes formed over the upper and lower layers and filling them with cement filler. Underground wall is constructed, and in order to increase the bending strength, the thickness of the front and rear wall plates is increased and the interval between the wall plates is increased. There was a need to.

  In view of such conventional problems, the present invention can be easily constructed even when the ground construction space is low and narrow, such as under an elevated road, etc. A large proof strength can be configured with a thinner wall thickness than in the past, and the precast concrete members can be easily and reliably connected to and water-stopped from the unit concrete walls formed in an extended arrangement with each other. It was made for the purpose of providing walls.

  In order to solve the conventional problems as described above and achieve the intended object, the feature of the invention according to claim 1 is that a concrete wall body in which a number of precast concrete members that are horizontally long are overlapped and connected in the vertical direction. In the retaining wall by the precast concrete member using the precast concrete member, the precast concrete member has an H-shaped cross section by a long and narrow rectangular flange parallel to each other and a web integrally provided between the flanges, and between the flanges. In addition, there is no web on the front end side than the partition wall on the most end side, and only the front end portions of both flanges protrude and flange extension pieces are formed at both ends. By connecting precast concrete members in a state where multiple flanges are stacked in the vertical direction with the width direction of the flange in the vertical direction, The unit concrete wall having the length of the precast concrete member as one unit is formed, and a plurality of the unit concrete walls are arranged side by side in the horizontal length direction, and the unit concrete walls are adjacent to each other. Solidified pillars by cast-in-place solidified by a cementitious solidified material are connected to the upper and lower connecting spaces surrounded by the flange extension piece formed between the end portions of the body and the partition wall flange at the foremost part. It is formed and the adjacent unit length concrete wall bodies are connected by the solidified column body.

  The invention according to claim 2 is characterized in that, in addition to the configuration of claim 1, the tension material is inserted between the precast members that are stacked one above the other within the thickness of the flange of the precast member. It exists in connecting to the hole by tensioning the PC tendon inserted through the upper and lower precast members.

    The present invention relates to a retaining wall by a precast concrete member using a concrete wall body in which a large number of precast concrete members that are horizontally long are connected one above the other. And a web integrally provided between the flanges, the cross-section is H-shaped, and is formed into an elongated shape integrally provided with a partition wall between the two flanges. There is no web on the front end side of the partition wall, only the front end portions of both flanges protrude and have flange extension pieces, and a plurality of the precast concrete members are stacked up and down with the width direction of the flanges in the vertical direction. By connecting and fixing to each other, the unit cast with the precast concrete member length as one unit A cement system is formed in a connecting part space which is configured to open up and down and is surrounded by the flange extension piece formed between the end parts of the unit concrete walls adjacent to each other and the partition wall flange at the foremost part. Solidified pillars are formed in the cast-in-place solidified by the solidifying material, and the unit-length concrete wall bodies adjacent to each other are connected by the solidified pillar bodies, thereby ensuring water stoppage between the unit concrete wall bodies. At the same time, the unit concrete wall bodies can be easily integrated.

The longitudinal side view which shows an example of implementation of the retaining wall which concerns on this invention. It is the longitudinal section front view. It is a side view of the precast concrete member used for the retaining wall shown in FIG. It is the sectional view on the AA line in FIG. It is a front view of the precast concrete member used for the retaining wall shown in FIG. It is the same top view. It is a longitudinal cross-sectional view which shows the connection state by the PC tendon between the precast concrete members used for the retaining wall shown in FIG. It is a longitudinal cross-sectional view which shows the reinforcement state by the reinforcing bar between the precast concrete members used for the retaining wall shown in FIG. It shows an underground groove forming state when a retaining wall using a precast concrete member according to the present invention is constructed, and (a) a longitudinal side view and (b) a longitudinal side view. It is a vertical side view which shows the state which connects and sinks a concrete member in the underground trench same as the above. It is a vertical front view which shows the boring state for forming the penetration part of the column body between 1 unit length concrete wall bodies. It is a vertical front view which shows a penetration hole formation state same as the above.

  Next, embodiments of the present invention will be described based on the examples shown in the drawings. FIG. 1 is a longitudinal side view of a retaining wall according to the present invention, and FIG. 2 is a longitudinal front view thereof. This retaining wall is made of continuous one-unit-length concrete walls A and A that are constructed by connecting a large number of precast concrete members 1 shown in FIGS. And is constructed by building.

  The precast concrete member 1 has a rectangular shape on both edges of a horizontally arranged web 2 having an elongated flat plate shape, and has a H-shaped cross section integrally including a pair of flanges 3 and 3 with the width direction facing up and down. The upper and lower surfaces have groove-shaped recesses 4 and 4 constituted by the flanges 3 and 3 and the web 2. The groove-like recesses 4 and 4 are partitioned by a plurality of partition walls 5, 5... Integrated with both flanges 3 and 3 and the web 2.

  Both ends of the precast concrete member 1 have no web 2 on the front end side of the partition wall 5a on the most end side, and have flange extension pieces 3a and 3a projecting only the front end portions of both flanges. Grooves 6 and 6 directed vertically are formed by the pieces 3a and 3a and the partition wall 5a.

  Further, the web 2 is provided with window holes 7, 7... That are vertically positioned so as to be located between the partition walls 5, 5 or 5a.

  In the flanges 3 and 3 of the precast concrete member 1, PC tension material insertion holes 10 are formed in the wall thickness at positions intersecting with the partition walls 5 so as to be directed vertically. As shown in FIG. 7, a coupler accommodating diameter increasing portion 11 is formed at the lower end of the PC tendon insertion hole 10, and a support for fixing the PC tendon 12 in a tensioned state at the upper end. A pressure plate 13 is embedded.

  The flange 3 on one side has through-holes 14, 14... For embedding reinforcing bars in the width direction of the flange 3, that is, in the vertical direction, at a predetermined interval. A through opening is provided.

  As shown in FIG. 1 and FIG. 2, the one-unit-length concrete wall A is formed by stacking a plurality of precast concrete members 1, 1... As shown, a PC tension member 12 is used for each of the precast concrete members 1 and 1 adjacent to each other, and they are connected by tensioning them.

  When tensioning, as shown in FIG. 7, the next PC tendon 12 is connected via the coupler 16 to the upper end of the PC tendon 12 fixed in the tensioned state by the fixing bracket 15, and the upper end is connected to the next precast. The operation of fixing on the upper surface of the concrete member 1 in the same manner is repeated to sequentially connect the upper precast concrete member 1 to the lower one.

  Reinforcing bar embedding through holes 14, 14 ... formed in one flange 3 of each precast concrete member 1 are continuous through holes between upper and lower flanges as shown in FIG. A continuous reinforcing bar 20 is inserted in the interior and filled with a cement-type filler 21 such as a high-strength, high-flow mortar.

  The number of the reinforcing bars 20 is designed in anticipation of a bending moment that is generated when the earth pressure on the back surface is applied to the concrete wall A of one unit length. In the flange on the rear surface side of the retaining wall, it is distributed so as to increase in the lower side and decrease in the upward direction, or distributed in the flange on the retaining wall surface side.

  Moreover, as shown in FIG. 2, the one-unit length concrete wall body A which made the length of the precast concrete member 1 a unit has the vertical groove 6 of the both ends of each precast concrete member 1 on the both sides. Are arranged in a continuous arrangement in the top and bottom, and a concave groove is formed on both side surfaces of the one unit length concrete wall A so as to extend vertically, and the adjacent one unit length concrete walls A and A are abutted together. A hollow cylinder portion 24 is formed in the upper and lower portions by both concave grooves 6 and 6, and a cement system such as soil cement or cast-in-place concrete in a place where cement milk is mixed with mud in the inside. A solidified column 25 is formed on the cast-in place solidified by the solidifying material. The solidified column 25 connects the concrete walls A, A by one unit length.

  Next, in the construction of the retaining wall described above, first, as shown in FIGS. 9A and 9B, the width, depth and length of the concrete wall A that is one unit length from the ground surface can be formed in the ground. Underground trench 30 is formed by excavation. This underground trench is formed by using a drilling stirrer 33 to which a pair of cutters 31 are attached at the lower end and a jet nozzle 32 for jetting water downward from the middle is used. A method of forming the underground trench 30 filled with the mud 34 by mixing the water with water can be used. In addition, a method may be used in which the underground groove 30 is formed using a backhoe or a grab bucket for trench excavation and the excavated trench is filled with a stabilizing liquid.

  Next, as shown in FIG. 10, the precast concrete members 1 and 1 adjacent to each other in the vertical direction are connected vertically in the underground groove 30, and the height of the precast concrete member 1 is completed every time one connection is completed. It sinks in the underground groove 30 for every minute (flange width). At this time, the mud 34 in the underground groove 30 moves to the upper side of the web from the window hole 7 of the precast concrete member 1, and is thus settled by its own weight or press-fitting of the precast concrete member 1.

  In addition, the portal crane installed across the underground ditch | groove 30 can be used for carrying in and sedimentation of this precast concrete member 1 as an example.

  Thus, after assembling in the state where one unit length concrete wall A, A adjacent to each other in the length direction is submerged in the underground groove 30, the opposite side of both one unit length concrete walls A, A A boring machine casing 40 is inserted into a rectangular tube-shaped space surrounded by the concave grooves 6 and 6 which are arranged to face each other at the edges, as shown in FIG. Pilot holes 42 are formed in the ground.

  After that, as shown in FIG. 12, a vertical axis 43 having a jet nozzle opening around the lower end is inserted into the pilot hole 42 and rotated and moved up and down while jet water 44 is jetted from the nozzle, thereby making a root hole 45. After that, cement milk is poured from the nozzle, and a root pile portion 46 made of soil cement in which cement is mixed with mud is formed in the root hole 45.

  Cement milk is poured into the hollow cylindrical portion 24 formed by the concave grooves 6 and 6 so as to be continuous with the root pile portion 46, and the solidified column body 25 continuous with the root pile portion 46 is formed.

  The solidified column 25 and the stake pile portion 46 are formed by inserting a tremy tube (not shown) into the piercing hole 45 and the hollow cylindrical portion 24 formed by jet water and placing concrete. You may form a concrete pile pile part and a concrete pillar made to continue to this.

  In this way, after the concrete wall A, A of one unit length is continuously constructed to the required length, the vertical ground surface is retained by the concrete wall by excavating the ground on the entire surface side. Form the desired underground space.

  After the formation of the underground space, the concrete wall A having a length of one unit may be prevented from falling by an underground anchor as shown in FIG. In this case, the underground anchor has an anchor insertion hole 50 formed in advance at a portion where the web 2 and the partition wall 5 of the precast concrete member 1 intersect, and a steel rod, a steel strand, or the like is formed in the anchor insertion hole 50. The tension member 51 is inserted, the tip is embedded in the anchor concrete 52 in the soil and fixed in the soil, and the other end is tension-fixed on the surface side of the precast concrete member 1.

  In this way, by forming the anchor insertion hole 50 at the portion where the web 2 and the partition wall 5 intersect and fixing at the crossing position, the stress at the fixing portion is effectively dispersed vertically and horizontally, and the proof stress A large retaining wall.

A One-unit-length concrete wall 1 Precast concrete member 2 Web 3 Flange 3a Flange extension piece 4 Groove-shaped recess 5 Partition wall 5a End-side partition wall 6 Groove 7 Window hole 10 PC tension material insertion hole 11 Diameter expansion for coupler accommodation Part 12 PC tension member 13 Supporting plate 14 Reinforcing bar embedded through hole 15 Fixing bracket 16 Coupler 20 Reinforcing bar 21 Cement filler 23 Top plate 24 Hollow cylinder part 25 Solidified column 30 Underground groove 31 Cutter 32 Jet nozzle 33 Digging stirrer 34 Mud 40 Casing 42 Pilot hole 43 Vertical axis 44 Jet water 45 Root hole 46 Root pile 50 Anchor insertion hole 51 Tensile material 52 Anchor concrete

Claims (2)

In the retaining wall by the precast concrete member using the concrete wall body which piled up and connected many precast concrete members which are long in the horizontal direction.
The precast concrete member has an elongated rectangular shape parallel to each other and a web integrally provided between the flanges and has an H-shaped cross section, and is formed into an elongated shape integrally provided with a partition wall between the flanges. And, at both ends, there is no web on the tip side from the partition on the most end side, only the tip portions of both flanges protrude and have flange extension pieces, and the precast concrete member is arranged in the width direction of the flanges. A unit concrete wall having the length of the precast concrete member as one unit is formed by connecting and fixing each other in a state where a plurality of layers are vertically stacked in the vertical direction, and the unit concrete wall is in the horizontal length direction. The frames formed between the end portions of the unit concrete walls adjacent to each other are arranged side by side in a continuous arrangement. Solidified pillars formed by cast-in-place solidified by cement-based solidified material are formed in the joint space which is open and communicated with the upper and lower sides surrounded by the extension piece and the partition wall flange at the foremost part, and are adjacent to each other by the solidified pillars Retaining wall made of precast concrete, characterized in that the unit-length concrete walls are connected. A PC tendon inserted between the precast members stacked in the vertical direction and strung material insertion holes formed in a vertically continuous arrangement within the thickness of the flange of the precast member, straddling the upper and lower precast members. The retaining wall by the precast concrete member of Claim 1 connected by tension | tensile_strength.

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