KR20090021708A - Precast retaining wall structure and construction method of the same - Google Patents

Abstract

Precast retaining wall structure and the construction method thereof are provided that the precast pillar is set up between the block wall body and the retaining wall. A precast retaining wall structure comprises a precast foundation block(2) having the wall support groove in the central part, a precast pillar(4) inserted into the wall support groove of the foundation block with the regular intervals, a precast wall block(6) having protrusion made of the vertical direction in both sides it is inserted in the assembly guide groove of pillar. The precast foundation blocks are connected in a row and form the base floor panel.

Description

Precast retaining wall structure and construction method of the same

The present invention relates to a precast retaining wall manufactured by a factory for rapid construction of a retaining wall, and a method of constructing the same. More specifically, the moment resistance of the wall is constructed by combining a precast strut and a precast block into which a prestress is introduced. The present invention relates to a precast retaining wall structure capable of reliably resisting earth pressure acting on the back side of a wall during soil refilling, and a construction method thereof.

In general, the retaining wall construction of road, rail slope, park area slope, river embankment, coastal road, and slope of residential area mainly consists of cast-in-place concrete (hereinafter referred to as 'RC retaining wall'). . In other words, in the construction of retaining walls, reinforcing bars and formwork have been installed and concrete has been installed, and double inverted T retaining walls were used.

The construction method of the RC retaining wall undergoes a series of processes such as ground excavation, foundation concrete placement, reinforcing steel reinforcement, body concrete placement, and backfill construction. In addition, when the height of the wall is high, there is a case that can not be poured at a time the body concrete pouring. In this way, the existing RC retaining wall construction has all the work directly in the field has the following problems.

First, the reinforcement work of the reinforcement should be performed by referring to the reinforcement diagram of the RC retaining wall at the site. At this time, curing time of more than 7 days is required for concrete to maintain strength for self-reliance, and formwork should be dismantled after completion of curing. That is, the construction of the RC retaining wall has a problem in economical and constructability because it takes several steps of construction process and long construction period.

Second, due to the construction method as described above, there is a high possibility of civil complaints due to long-term vehicle traffic blocking and securing a detour road, and it is disadvantageous in terms of stability since there is a problem of exposure to danger for a long time.

Due to these problems, the use of precast retaining walls (hereinafter, referred to as 'PC retaining walls') is gradually increasing in consideration of constructionability, economic feasibility, and potential civil complaints. Since the PC retaining wall is manufactured at the factory and only the assembly is carried out at the site, it is very excellent in workability, and thus the possibility of civil complaints can be minimized, which is very effective for a busy urban center or an urgent construction.

A conventional precast subwall retaining wall having the above concept is shown in FIG.

As shown in the drawings, the PC retaining wall constructed by assembling and installing the precast concrete blocks 100a, 100b, 100c, 100d, and 100e in the horizontal and vertical directions, respectively, having protrusions and grooves at the top and the bottom thereof, is manufactured in advance in the factory. A precast concrete block is fabricated prefabricated in the field, and the support body 102 having a kind of sub-wall function is inclinedly installed between the retaining wall and the base plate 104. However, the structure has a problem in that it is not excellent in workability compared to RC concrete because a plurality of supports 102 are installed on the entire rear wall separately.

In order to improve this problem, "precast subwall retaining wall" of Korean Utility Model Registration No. 20-0404658 has been proposed. The structure is a PC retaining wall in which the entire lower part of the precast panel wall 120 is inserted into a rectangular U-shaped shear groove 111 formed on the upper surface of the precast rectangular base plate 110 as shown in FIG. The base plate 110 and the subwall 130 supporting the lower portion of the wall 120 are further installed. This is an improvement of the existing method, and some commercialization is possible in the subwall retaining wall.

The sub-wall retaining wall structure is a sub-wall body 130 is to be constructed separately, but if the construction and site conditions are consistent, it is a preferable structure as a PC retaining wall. However, the role of the structural subwall 130 is only to improve the connection between the wall and the base plate, and because the subwall is small in size, the subwall and the base, which are advantages of the general subwall retaining wall, support the retaining wall together. There is only one side support effect that supports only the connection between foundation and wall, not the side support effect. As a result of examining the structural aspect of the subwall retaining wall, when considering that the portion of the retaining wall having the greatest moment is the part where the foundation part and the wall are connected, the U-shaped shear groove of the precast rectangular foundation plate 110 ( The hinge connection structure in which the entire lower part of the precast panel wall body 120 is inserted into 111 is unstable in supporting the retaining wall upright. Of course, in the buttress-type retaining wall, it is possible to supplement the problem of the hinge connection by increasing the stability by installing an additional buttress in order to secure this, but when the retaining wall becomes high and excessive earth pressure is generated, structural improvement must be made. The problem still exists.

Accordingly, the present invention has been proposed to solve the above problems, by installing a precast strut pre-stressed at a predetermined interval of the precast base plate, and inserting and assembling a precast concrete block between the struts Precast concrete blocks are constructed of two-sided support structures connected between struts and struts, rather than cantilevered one-sided supports, like conventional retaining walls, so that they can reliably resist earth pressure on the back of walls and secure structural stability. It is an object of the present invention to provide a precast retaining wall structure and a construction method thereof.

In addition, the present invention is to provide a precast retaining wall structure and its construction method that can be integrated with the support pillar and the base plate using the PS steel wire as needed, and to enable a high retaining wall construction by installing a subwall. Have a purpose

In order to achieve the above object, the present invention, the precast foundation block formed with a wall support groove in the center; Precast posts are inserted into the wall support grooves of the respective basic blocks at predetermined intervals, and assembly guide grooves are formed at both sides thereof. And includes a precast concrete wall block provided with projections in the vertical direction on both sides to be fitted into the assembly guide groove of the support,

The foundation blocks are connected in a line to form a foundation floor plate, and the precast concrete wall blocks are assembled to be stacked in an assembly guide groove of the precast strut to provide a precast retaining wall structure.

The precast foundation block further includes a subwall support groove formed on at least one upper surface of the wall support groove, and further includes a subwall block having a protrusion on a bottom surface thereof to be inserted into and supported in the subwall support groove. do.

In addition, the present invention is a wall support groove is formed in the central portion, the first step of installing a precast foundation block formed in a row on the bottom to the first sheath tube through the wall support groove in the transverse direction; Synthesizing an H-beam into the wall support groove of the precast foundation block and inserting the precast struts into which the prestress is introduced at predetermined intervals, the second sheath tube provided through the first sheath tube and the lower side of the precast struts. Inserting a PC wire to integrate the precast strut and the precast foundation block; And a third step of assembling and stacking protrusions provided at both sides of the precast wall block into the assembly guide grooves of the precast strut. And a fourth step of connecting the precast wall blocks stacked by inserting steel rods into the connection rings provided on the rear surface of the precast wall block.

In the construction method of the retaining wall structure, the first step is to insert the protrusion of the sub-wall block in the sub-wall support groove formed on one side of the precast foundation block on the basis of the wall support groove, the side groove of the sub-wall block is plan of the post A first process of making contact with the ground; A second step of integrating the PC steel wire passing through the precast strut from the wall supporting groove of the precast foundation block by passing through the protrusion of the subwall block; And a third connecting ring provided in the groove of the sub-wall block and a fourth connecting ring provided at a predetermined interval on the side of the precast support, and inserting a steel rod into the third and fourth connecting ring to precast support and And a third process of integrating the subwall block.

According to the present invention having the above characteristics, when precasting all of the block base plate, the block wall and the subwall, and assembling the block wall body to the base plate, the H-beam is synthesized and the precast which introduces the prestress into the PC steel wire. By building the retaining wall by placing the strut between the block walls, it has the effect of reliably resisting the earth pressure acting on the back side of the wall at the time of backfilling and providing structural stability.

In addition, the present invention can build the retaining wall only by assembling the precast struts and block walls on the floor base plate in the field, and thus has other effects excellent in workability and economic efficiency.

In addition, the present invention can not only achieve the integration of the base plate, support pillars and buttresses using PS steel wires as necessary, but also allows the construction of high retaining walls by contacting the buttresses with each support pillar and by integrating steel rods. It has another effect that can make it work.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 3 to 20.

The precast retaining wall and its construction method according to the present invention improve the moment resistance of the wall by placing the precast struts into which the prestress is introduced between the base plate and the block wall, and reliably respond to the earth pressure acting on the back surface of the retaining wall, By adding a subwall block to the cast posts, structural stability is given to enable high retaining wall construction.

Fig. 3 is a perspective view showing the configuration of the first embodiment of the precast retaining wall in which the prestress is introduced according to the present invention.

As shown in the figure, the present invention includes a precast foundation block 2 having a wall support groove 2a formed in a central portion thereof; A precast support (4) inserted into the wall support groove (2a) of the foundation block (2) at a predetermined interval and having assembly guide grooves (4a) formed at both sides thereof; And a precast concrete wall block 6 provided with projections 6a in the vertical direction on both sides to fit into the assembly guide groove 4a of the precast strut 4 to form the retaining wall wall.

Fig. 4 is a perspective view showing the structure of the basic block 2 which is the main part of the present invention, and Fig. 5 is a perspective view showing the structure of the precast strut.

As shown in Fig. 4, the foundation block 2 includes a first sheath tube 12 that penetrates the central portion of the wall support groove 2a in a transverse direction from one side.

As shown in FIG. 5, the precast strut 4 is formed of an H-shaped composite structure in which an H-beam is embedded, and the strut 4 communicates with the first sheath tube 12. The second sheath tube 14 is provided at a corresponding position.

The first PC steel wire 16 may be inserted into the first and second sheath pipes 12 and 14 to integrate the precast foundation block 2 and the precast strut 4. It is well known that the introduction of the first PC steel wire 16 is not necessary, and the PS steel wire may be omitted in the case of the retaining wall having a small height by structural calculation.

6A and 6B are diagrams illustrating a configuration in which prestress is introduced into a precast strut, and the precast strut may have a prestress to be sufficiently resistant to excessive earth pressure due to a high height of the retaining wall. . FIG. 6A shows the prestressing by inserting the second PC steel wire 18 into one plan portion of the precast strut 4 into which the H-beam 8 is synthesized, and FIG. 6B shows that the H-beam 8 is disposed. The second PC steel wire 18 is embedded in one flange portion of the H-shaped precast strut 4 that has been preformed.

Fig. 7 shows the basic structure of the precast concrete wall block 6 which is the main part of the present invention, and Figs. 8A and 8B show the detailed structure of the precast concrete wall block 6 which is the main part of the present invention. As shown in FIG. 8A, a groove 6b is formed in an upper portion of the precast wall block 6, and a first connecting ring 19 is provided at the bottom of the groove 6b to facilitate lifting. As shown in FIG. 8B, the second connecting ring 20 is provided at a predetermined interval at the rear peripheral edge of the precast wall block 6.

As shown in FIG. 9, the precast wall block 6 configured as described above is fitted with a first steel bar 22 to an adjacent second connecting ring 20 between the wall block 6 and the wall block 6 '. Integrate.

Next, the construction method of the precast retaining wall structure according to the first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 10, first, the base blocks 2 are arranged in a row, and the precast struts 4 are installed upright in the middle of the wall support grooves 2a provided at the center of each base block 2. . As shown in Fig. 11, the first PC steel wire 16 is attached to the first sheath tube 12 formed in the wall support groove 2a and the second sheath tube 14 formed in the precast strut 4. Integrate through.

As shown in Fig. 12, the projections 6a of the precast concrete wall blocks 6 are inserted into the assembling guide grooves 4a provided on the side surfaces of the respective precast struts 4, and are sequentially stacked. The retaining wall wall as shown in Fig. 3 is formed by fitting the first steel bar 22 to the second connecting ring 20 between the precast concrete wall blocks 6 and 6 '.

Next, a retaining wall structure according to a second embodiment of the present invention will be described with reference to FIGS. 13 to 20. In the present embodiment, the height of the retaining wall is high to provide structural stability when excessive earth pressure occurs, and the same reference numerals are given in the same configuration as in the first embodiment.

Figure 13 is a perspective view showing the structure of the retaining wall structure according to a second embodiment of the present invention, Figure 14 is a perspective view showing the configuration of the precast strut, Figure 15 is an exploded perspective view showing a state in which the sub-wall block is assembled to the foundation block to be.

As shown in the figure, the plurality of precast foundation blocks 2 further include a subwall support groove 2b formed on one side surface of the wall support groove 2a. The subwall support groove 2b is provided with a protrusion 32a at a bottom thereof to be inserted therein, and a subwall block 32 having a right triangle shape is installed. At this time, the subwall block 32 is applicable to both the front wall and the rear wall, and is determined in consideration of the site conditions.

The second sheath pipe provided in the lower part of the first sheath pipe 12 and the precast strut 4 provided in the wall support groove 2a of the base block 2 is formed in the protrusion 32a of the subwall block 32. A third sheath tube 33 is provided to communicate with 14.

As described above, the foundation block 2, the precast strut 4 and the sub-wall block 32 are integrated with each other when the PC steel wire 16 penetrates. If it is determined that the integration of the foundation block 2, the precast strut 4 and the subwall block 32 is unnecessary by structural calculation, it is not necessary to introduce the PS steel wire into the strut and the base plate.

The subwall block 32 has a groove 32b formed in a longitudinal direction on its rear side, and an inner surface of the groove 32 is provided with third connecting rings 34 at predetermined intervals, as shown in FIG. do. As shown in Fig. 14, each of the precast struts 4 is provided with fourth linking rings 36 at predetermined intervals on one side of the flange face.

The groove 32b of the sub-wall block 32 is in contact with the flange surface of the precast strut 4, wherein the third and fourth connecting rings 34 and 36 overlap and communicate with each other. The second steel bar 38 is fitted to the third and fourth linkages 34 and 36 to integrate the sub-wall block 32 and the precast strut 4.

The second steel bar 38 may be replaced by a connecting bolt.

The groove 32b is filled with non-contraction mortar and cured.

A construction method of the retaining wall structure according to the second embodiment of the present invention configured as described above will be described in detail with reference to FIGS. 15 to 20.

As shown in Fig. 15, the subwall block 32 is inserted into the subwall support groove 2b of the foundation block 2, and the precast support 4 is inserted into the wall support groove 2a. Then, from the first sheath tube 12 of the foundation block 2 to the second sheath tube 14 provided in the lower part of the precast strut 4 and the third sheath tube 33 of the subwall block 32 are formed. 1 Penetrate the PC steel wire 16. By this structure, the base block 2, the precast struts, and the subwall blocks 32 are integrated in tension.

In addition, as shown in FIGS. 17 to 19, the third connecting ring 34 provided on the groove 32b side of the sub-wall block 32 and the fourth connecting ring 36 provided on the precast support 4 are provided. ) Is overlapped in the groove 32b, and the precast strut 4 and the sub-wall block 32 are integrated by fitting the second steel bar 38 to the overlapped connecting ring.

Finally, as shown in FIG. 20, the retaining wall wall is constructed by continuously stacking the protrusions 6a of the precast concrete wall block 6 in the assembly guide grooves 4a of the precast strut 4. The concave mortar is filled in the groove 32b to be integrated.

Precast concrete in the second embodiment of the present invention, as in the first embodiment, when the height of the retaining wall is a high earth pressure occurs in the PC steel wire to one side of the planar portion of the precast strut with the H-beam composite The prestress can be introduced by embedding, or the prestress can be introduced by embedding a PC steel wire in one flange portion of the H-shaped precast strut in which the H-shaped pile is disposed.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope without departing from the technical spirit of the present invention. It will be evident to those who have knowledge of.

1 is a perspective view showing the configuration of a precast subwall retaining wall according to the prior art;

Figure 2 is a perspective view showing the configuration of a sub-wall retaining wall according to the prior art.

Figure 3 is a perspective view showing the configuration of a first embodiment of a precast retaining wall structure according to the present invention.

4 is a perspective view showing the structure of a basic block which is a main part of the present invention;

Fig. 5 is a perspective view showing the basic structure of a precast strut in which prestress which is a main part of the present invention is introduced.

6A and 6B illustrate another embodiment of the precast strut incorporating the prestress shown in FIG.

Figure 7 is a perspective view showing the configuration of a precast wall block, which is a main part of the present invention.

8A and 8B are detailed views of the precast wall block shown in FIG.

9 is a perspective view showing a state in which the precast wall blocks are continuously stacked and connected;

10 to 12 is a construction sequence diagram of a precast retaining wall structure is introduced pre-stress according to the present invention.

Fig. 13 is a perspective view showing the construction of a second embodiment of a precast retaining wall structure in which prestress is introduced according to the present invention;

Fig. 14 is a perspective view showing the constitution of a precast strut which is the principal constitution of the second embodiment of the present invention.

15 to 20 is a construction sequence diagram of a precast retaining wall structure according to a second embodiment of the present invention.

Claims (12)

A precast foundation block having wall support grooves formed in a central portion thereof; Precast posts are inserted into the wall support grooves of the respective basic blocks at predetermined intervals, and assembly guide grooves are formed at both sides thereof. And Precast wall block provided with projections in the vertical direction on both sides to be fitted into the assembly guide groove of the support Including, The foundation blocks are connected in a line to form a foundation floor plate, and the precast wall blocks are assembled to be stacked on the assembly guide grooves of the precast struts to form a retaining wall. The method of claim 1, The precast foundation block further includes a subwall support groove formed on at least one upper surface of the wall support groove, A subwall block having a protrusion on a bottom thereof to be inserted into and supported in the subwall support groove. Precast retaining wall structure further comprises. The method according to claim 1 or 2, The precast retaining structure is a precast retaining wall structure, characterized in that the H-shaped composite column is embedded in the H-beam embedded in precast concrete. The method according to claim 1 or 2, The precast retaining wall has a H-shape, the pre-cast retaining wall structure, characterized in that the pre-stress is introduced by inserting a PC steel wire in one flange surface. The method according to claim 1 or 2, The precast strut is a precast retaining wall structure, characterized in that the H-beam is embedded in the precast concrete, H-shaped composite column in which the pre-stress is introduced by inserting a PC steel wire on one side of the flange surface of the H-beam. The method according to claim 1 or 2, A first sheath pipe provided through the wall support groove of the precast foundation block in a transverse direction; A second sheath tube provided to correspond to the first sheath tube at a lower portion of the precast strut fitted into the wall support groove; And PC steel wire for integrating a precast foundation block and a precast strut through the first and second sheath pipes Precast retaining wall structure further comprising. The method according to claim 1 or 2, Connecting rings provided on a rear surface of the precast wall block at predetermined intervals; And The precast retaining wall structure further comprises a first steel rod that is vertically fitted to each other in the adjacent link of the laminated precast wall blocks to connect the wall blocks. The method according to claim 1 or 2, Precast retaining wall structure further comprises a groove formed on the upper surface of the precast wall block, and a lifting ring installed on the bottom of the groove. The method of claim 2, The sub-wall block is formed with a groove on the side in contact with the precast strut, Third connection rings provided at predetermined intervals in the grooves; A fourth connection ring provided at one flange surface of the precast support at predetermined intervals and positioned to overlap the third connection ring;  A second steel rod penetrating the third and fourth connecting rings to fix the precast strut and the subwall block; And Anhydrous mortar filled in the groove and cured Precast retaining wall structure further comprising. A first step in which a wall supporting groove is formed at a central portion thereof, and a precast foundation block is formed in a row on the floor so that the first sheath pipe passes through the wall supporting groove in a transverse direction; Synthesizing an H-beam into the wall support groove of the precast foundation block and inserting the precast struts into which the prestress is introduced at predetermined intervals, the second sheath tube provided through the first sheath tube and the lower side of the precast struts. Inserting a PC wire to integrate the precast strut and the precast foundation block; And A third step of assembling and stacking protrusions provided at both sides of the precast wall block in the assembly guide groove of the precast strut; And A fourth step of connecting the stacked precast wall blocks by inserting a steel rod into the connection ring provided on the rear surface of the precast wall block; Construction method of precast retaining wall structure comprising a. The method of claim 10, The first step is A first step of inserting a protrusion of the subwall block into a subwall support groove formed on one side surface of the precast foundation block based on the wall support groove, and making the side groove of the subwall block contact the flange surface of the support; A second step of integrating the PC steel wire passing through the precast strut from the wall supporting groove of the precast foundation block by passing through the protrusion of the subwall block; And The third connecting ring provided in the groove of the sub-wall block and the fourth connecting ring provided at a predetermined interval on the side of the precast support communicate with each other, and a steel rod is inserted into the third and fourth connecting rings to precast support and the subwall. Third process of unifying blocks Construction method of precast retaining wall structure comprising a. The method of claim 11, wherein And a fourth process of curing the non-contraction mortar in the groove of the sub-wall block after the third process to cure.

Images