JP2523234B2 - Anchor retaining wall - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor retaining wall, and more particularly to an anchor retaining wall having a permanent anchor that is installed substantially vertically to support back-acting earth pressure.

[0002]

2. Description of the Related Art Generally, when cutting a sloping ground to secure a construction site or the like, a retaining wall 50 is constructed to prevent the slope slope S of the cut slope S from collapsing as shown in FIG. Although the structural type of this type of retaining wall varies depending on the earth pressure acting and the application, an inverted T-shaped reinforced concrete retaining wall or an L-shaped reinforced concrete retaining wall is usually adopted. In addition, when constructing this type of retaining wall, it is necessary to construct it so that the bottom slab heel of the retaining wall does not enter the adjacent land if it is restricted by the boundary of the adjacent land. On the other hand, since the retaining wall 50 has the bottom slab 51, it is necessary to excavate the retaining wall rear surface portion 52 in a wide range in order to construct the bottom slab 51. Then, a mountain anchorage by a temporary anchor 53 that can be removed later in consideration of the boundary with the adjacent land is carried out, a reinforced concrete retaining wall 50 is constructed, and then the temporary mountain anchorage is removed, while the rear surface of the vertical wall 54 of the retaining wall. Is backfilled with backfill soil to restore the current state, and a building 55 or the like is constructed in front of the retaining wall.

[0003]

However, the above-mentioned retaining wall has a problem that the backfilling work on the rear surface of the retaining wall occupies a large proportion of the work time, which delays the whole process, and a suitable backfilling soil is required. There is also the problem of having to secure the amount. Further, in order to construct the bottom plate of the retaining wall, the clearance between the adjacent land boundary and the retaining wall vertical wall must be taken large, and the site cannot be effectively used.

Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques, to minimize backfilling of the back surface of the retaining wall, and to provide an anchor retaining wall that allows the site to be utilized to the maximum extent. To do.

[0005]

In order to achieve the above object, an anchor retaining wall according to the present invention comprises a foundation pile constructed in a supporting ground at a predetermined interval and a main pillar standing on the foundation pile. An anchor for holding the combined state of the foundation pillar and the main pillar, a fixing frame having a pedestal portion capable of fixing the head of the anchor and integrally connecting the tops of the respective main pillars, and the adjacent main pillar And an intermediate wall provided between the side portions of the.

[0006]

According to the present invention, foundation piles are driven in the support ground at predetermined intervals, and a main pillar is erected on the foundation pile so as to be integrated with the foundation pile. An anchor whose tip is fixed in the supporting ground is formed at an almost vertical angle, and the top of each parent pillar is integrally connected by a fixing frame having a pedestal that can fix the head of this anchor,
Since the intermediate wall is provided between the side portions of the adjacent main pillars, the retaining wall can be constructed with almost no need to excavate the rear surface of the retaining wall,
It is possible to support the back surface earth pressure acting on the retaining wall composed of the main pillar supported by the anchor and the intermediate wall.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an anchor retaining wall according to the present invention will be described below with reference to the accompanying drawings. In FIG. 1, an anchor retaining wall 1 according to the present invention is a foundation pile 4 constructed so as to be entirely constructed in a support ground 3 at predetermined intervals at a position where a slope 2 is excavated to a predetermined height surface, and this foundation pile. 4 and a parent pillar 5 made of reinforced concrete which is structurally and integrally erected on the top of the parent pillar 4, and a vertical stake is placed substantially vertically at the excavation rear surface position of the parent pillar 5, and the tip is anchored in the supporting ground. An anchor 6 exemplifying an earth anchor, and a pedestal 7 that can fix the head of the anchor 6, and a fixing frame made of reinforced concrete that integrally connects the tops of the respective main pillars 5,
It is composed of a precast concrete intermediate wall continuously provided between the side portions of the adjacent parent columns 5 made of reinforced concrete. The foundation pile 4 is a deep foundation pile constructed in this embodiment. Since this deep foundation pile does not receive a large vertical bearing force, the pile radius should be the minimum radius for construction. Further, it is preferable that the entire pile is applied to a support layer in the ground, and the pile is made of reinforced concrete having a predetermined amount of reinforcement so as to resist the lateral sliding shearing force acting across the pile. Furthermore, on the top of the foundation pile 4, there is a parent pillar 5 made of reinforced concrete whose cross section is almost square.
Is erected. The reinforcing bars of this main pillar 5 are foundation piles 4
The main pillar 5 and the foundation pile 4 are structurally integrated with each other so as to be able to resist rear surface earth pressure by being joined to the reinforcing reinforcing bars of the above. On the back side of the main pillar 5, a ground anchor made of steel stranded wire is placed at a predetermined distance. As a tensile material of this earth anchor, a PC stranded wire or a PC steel rod having high tensile strength is used. At this time, an anchor body fixing portion 6b is formed at a tip of the earth anchor 6 over a predetermined length, and the anchor body fixing portion 6b is fixed to the supporting ground by mortar or cement paste. In order to fix the anchor 6, a beam-shaped fixing frame 8 that connects the tops of the main pillars 5 is constructed. The fixing frame 8 is made of reinforced concrete and has a slab-like shape for arranging the connecting beam portion 8a having a rectangular cross-section for connecting the parent columns 5 and the pedestal portion 7 so as to project to the back surface of the connecting beam portion 8a. The fixing beam 8b. At this time, the size of the rear end of the fixing beam 8b is set so as not to invade the adjacent land boundary. A head 6a of the anchor 6 projects through the through hole of the fixing beam 8b on the upper surface of the fixing beam 8b, and the anchor head 6a is pulled with a predetermined tension force by a hydraulic jack or the like (not shown) to obtain a predetermined tension force. Is held and is fixed and fixed with a fastener. In order to securely perform the tension fixing work of the anchor 6, a pedestal portion 7 made of steel is installed. In addition, an intermediate wall 9 made of precast concrete is constructed so as to connect the side portions of the adjacent main pillars 5. The intermediate wall 9 can share a part of the back surface earth pressure applied to the main pillar 5. Then, the predetermined building 10 is constructed within the site secured in front of the retaining wall.

FIG. 2 shows a part of the anchor 6 retaining wall shown in FIG. 1. This anchor retaining wall is a foundation pile 4 constructed at predetermined intervals, and a main pillar 5 constructed on this. The intermediate wall 9 is arranged so as to close the space between the main pillars 5. In the same figure, the end portion of the retaining wall is shown, and the end portion 9a made of reinforced concrete is also formed in this end portion. Also,
On the upper surface of the fixing frame 8, a steel pedestal for fixing the heads of the ground anchors 6 placed at the same intervals as the main pillars 5 is arranged, and each ground anchor 6 is fixed with a predetermined tension force. It has become established in.

Next, a case where a deep foundation pile is used as a foundation pile for the construction procedure of the anchor 6 retaining wall will be described with reference to FIG. First, the slope of the construction site of the building is cut (step 100). In this cutting work, the front surface of the main pillar 5 is excavated in a groove shape. At this time, a predetermined mountain retaining work is constructed according to the condition of the ground (step 110). In many cases, it is not possible to construct a crossbeam on a sloping ground, so the required number of temporary anchor steps, etc. should be determined by temporary calculation, and the mountain anchorage with temporary anchors shall be performed. Along with this lowering of the ground, a permanent anchor 6 is placed at the back of the mountain retaining surface so as to be substantially vertical and parallel to the main pillar, and an anchor body fixing portion 6b is formed on the supporting ground (step 120). After the bottoming is completed and the excavation is carried out to the vicinity of the supporting ground, deep foundation piles 4 are constructed at predetermined intervals (step 130). Then, the reinforced concrete main pillar 5 is placed on the top of the deep foundation pile 4 (step 140).
Further, a fixing frame 8 is installed so as to connect the tops of the main pillars 5, and a fastener for fixing and holding each anchor head 6a and a steel pedestal 7 which is a supporting member thereof are installed (step 150). When the concrete strength of the fixing frame 8 reaches a predetermined strength, the anchor 6 is tensioned by a predetermined introduction tension force, and the anchor head 6a is fixed by a fastener (step 160). From this state, the front surface of the main pillar 5 is lowered by the excavator (step 170), and the intermediate wall 9 of precast concrete is installed between the adjacent main pillars 5 (step 1).
80). The anchor retaining wall may be constructed by repeating the above work over a predetermined span.

Next, as another embodiment of the present invention, an anchor retaining wall in which an anchor is constructed in a main pillar is shown in FIG.
Will be described with reference to. In the present embodiment, it is preferable to carry out under the ground condition that the back surface earth pressure acting on the retaining wall is not so large and the main pillar 15 itself can resist the acting earth pressure. At this time, the purpose is to increase the self-supporting strength by increasing the lateral resistance of the main pillar 15. That is, prestress may be introduced in the vertical direction of the main pillar 15 to make the main pillar 15 a prestressed concrete pillar. In the present embodiment, first, a cylindrical void member is arranged at a predetermined position during assembling of the form to form a through hole 15a for inserting the anchor 16 such as a PC steel wire when constructing the main pillar 15. The pillar is constructed by placing concrete. Then, the PC steel material 16 of the anchor is inserted into the through hole 15a and the tip portion is fixed in the foundation pile. Further, when the concrete of the pillar reaches a predetermined strength, the PC steel material 16 is tensioned and tensioned with a predetermined tension force to introduce prestress. In this way, the initial introduced compressive force introduced into the main pillar 15 can prevent the cross section of the pillar from being pulled against the applied earth pressure. In addition,
In the above-mentioned embodiment, by using H-shaped steel or the like for the main pillar, it is possible to use the temporary pile stay with the transverse sheet pile.

Further, in the above-mentioned embodiment, the deep foundation pile was constructed as the foundation pile, but various place punches and steel pipe piles can be constructed instead of the deep foundation pile.

[0012]

As is apparent from the above description, according to the present invention, foundation piles are driven in the support ground at predetermined intervals, and the main pillars are erected on the foundation piles so as to be integrated with the foundation piles. Then, an anchor whose tip is anchored in the support ground at an almost vertical angle is placed at the excavation rear surface position of this parent pillar, and each parent is attached by a anchoring frame having a pedestal part that can anchor the head of this anchor. Since the tops of the pillars are integrally connected and the intermediate wall is provided between the side parts of the adjacent parent pillars, there is almost no need to excavate the back surface of the retaining wall, and a small pillar composed of the parent pillar and the intermediate wall It is sufficient to construct a retaining wall in a large scale, and it is possible to construct an retaining wall having excellent mechanical properties and an economical structure.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an anchor retaining wall according to the present invention.

FIG. 2 is a perspective view schematically showing the anchor retaining wall shown in FIG.

FIG. 3 is a construction flowchart showing an example of a construction procedure of an anchor retaining wall according to the present invention.

FIG. 4 is a cross-sectional view showing another embodiment of the anchor retaining wall according to the present invention.

FIG. 5 is a cross-sectional view showing an example of a conventional retaining wall.

[Explanation of symbols]

 1 Anchor retaining wall 3 Supporting ground 4 Foundation pile 5,15 Main pillar 6,16 Anchor 8 Anchoring frame 9 Intermediate wall

Claims (1)

(57) [Claims] 1. A foundation pile installed in a supporting ground at predetermined intervals, a parent pillar standing on the foundation pile, an anchor for holding the combined state of the foundation pile and the parent pillar, and a head of this anchor. An anchor characterized by having a pedestal part capable of fixing the parts and having a fixing frame for integrally connecting the top parts of the respective parent pillars, and an intermediate wall provided between the side parts of the adjacent parent pillars. Retaining wall.