Precast prefabricated box and extened precast prefabricated box including the same

Abstract

The present invention relates to a precast prefabricated box. A precast prefabricated box according to an embodiment of the present invention comprises a pair of wall sections spaced apart along one direction; a foundation section coupled below the pair of wall sections; and a slab coupled above the pair of wall sections. Each of the pair of wall sections comprises a wall body extending in an upward and downward direction; and a wall section steel bar with at least a portion embedded in the wall body. The wall section steel bar comprises a main wall section steel bar coupled to the wall body and the slab; and an auxiliary wall section steel bar embedded in the wall body and coupled to the main wall section steel bar. The main wall section steel bar and the auxiliary wall section steel bar are cross-coupled, and the wall section steel bar has a cross shape.

Description

Technology Field

[0001] The present invention relates to a precast prefabricated box, and more specifically, the present invention relates to a precast prefabricated box comprising an improved steel rod structure capable of improving constructability and increasing stress distribution by separating and arranging a cross-shaped steel rod for the wall section and an L-shaped steel rod for the base section in the vertical direction.

[0002] In addition, the present invention relates to an expanded prefabricated box comprising a first welded joint and a second welded joint. Background Technology

[0004] Precast concrete (PC) prefabricated box structures are structures in which concrete members are pre-fabricated in a factory and assembled on-site for use in underground buried structures, drainage channels, bridges, communication conduits, power conduits, utility tunnels, box culverts, etc. The aforementioned PC box-type structures are widely used due to their advantages of significantly shorter construction periods and uniform quality compared to on-site casting methods.

[0005] PC prefabricated box structures are generally composed of floor foundations, wall slabs, side walls, top slabs, or monolithic box members, and multiple box units are connected longitudinally on-site to form a continuous structure.

[0006] In this case, the structure of the connection between box units acts as a very important factor in ensuring structural stability, watertightness, seismic resistance, and durability.

[0007] In the connection parts of conventional precast concrete boxes, a method of inserting straight steel rods to fasten adjacent box units has generally been used.

[0008] The above-mentioned straight steel bar has a structure in which it is inserted in a straight line into a through hole or insertion hole formed at the end of a box, and then secured by a nut, anchor, or mortar filling.

[0009] On the other hand, while such a linear steel bar structure can provide a certain level of support for tensile loads, it has limitations in that its resistance to shear forces, torsion, and rotational displacement caused by ground settlement, temperature changes, and repetitive loading is limited.

[0010] In particular, if minute relative displacement occurs at the connection point, the steel rod may form a gap within the insertion hole or localized stress concentration may occur, which can lead to concrete cracking, reduced fastening strength, and decreased structural stability. Prior art literature

[0012] Registered Patent No. 10-1375896 (Published on March 19, 2014) The problem to be solved

[0013] The present invention aims to solve the aforementioned problems and other problems.

[0014] Another objective of the present invention is to provide a precast prefabricated box structure capable of improving constructability and increasing stress distribution by separating and arranging a cross-shaped wall section steel rod and an L-shaped foundation section steel rod in the vertical direction. means of solving the problem

[0016] A precast prefabricated box according to one aspect of the present invention comprises a pair of wall sections spaced apart along one direction; a foundation section coupled below the pair of wall sections; and a slab coupled above the pair of wall sections, wherein each of the pair of wall sections comprises a wall body extending in an up-and-down direction; and a wall section steel bar with at least a portion embedded in the wall body, wherein the wall section steel bar comprises a main wall section steel bar coupled to the wall body and the slab; and an auxiliary wall section steel bar embedded in the wall body and coupled to the main wall section steel bar, wherein the main wall section steel bar and the auxiliary wall section steel bar are cross-coupled, and the wall section steel bar may have a cross shape.

[0017] Additionally, the foundation member comprises an outer foundation member connected to the lower surface of the pair of wall bodies; an inner foundation member extended and formed above the outer foundation member and connected to the side of the wall body; and a foundation member steel rod with at least a portion embedded in the outer foundation member, wherein the foundation member steel rod may include a main foundation member steel rod coupled to the wall body and the outer foundation member; and an auxiliary foundation member steel rod embedded in the outer foundation member and coupled to the main foundation member steel rod.

[0018] In addition, the auxiliary base steel bar can be bent and extended from the end of the main base steel bar.

[0019] In addition, the above-mentioned base bar may include an L shape.

[0020] Additionally, the slab may include an outer slab connected to the upper surface of the pair of wall bodies; and a slab protrusion formed below the outer slab and having a slab haunch structure, wherein the outer slab may include an outer slab body, outer slab receiving protrusions symmetrically arranged on both upper surfaces of the outer slab body, and a concrete receiving groove surrounded by the outer slab body and the outer slab receiving protrusions.

[0021] An extended prefabricated box according to another aspect of the present invention comprises a plurality of precast prefabricated boxes arranged in a row along the front-rear direction, wherein each of the plurality of precast prefabricated boxes comprises a pair of spaced-apart wall sections; a foundation section coupled below the pair of wall sections; and a slab coupled above the pair of wall sections, wherein each of the pair of wall sections comprises a wall body, a wall connecting section formed protruding forward from the wall body, and a wall section steel rod embedded in the wall body, wherein the wall section steel rod comprises a main wall section steel rod connected to the wall body and the slab; and an auxiliary wall section steel rod coupled to the main wall section steel rod, and the wall connecting section of any one of the adjacent pair of precast prefabricated boxes may be fitted into another precast prefabricated box.

[0022] Additionally, the expanded prefabricated box includes a first welded joint, wherein the first welded joint may be formed on a wall connecting part forming the rear prefabricated box and a wall protrusion forming the front prefabricated box among a pair of prefabricated boxes connected front and rear.

[0023] Additionally, the expanded prefabricated box comprises one or more second welded joints located on the right or left side of the plurality of precast prefabricated boxes, wherein the one or more second welded joints may be formed in a vertical direction on the wall portion forming the rear precast prefabricated box and the wall portion forming the front precast prefabricated box among a pair of precast prefabricated boxes connected front and rear. Effects of the invention

[0025] The effects of a precast prefabricated box according to one embodiment of the present invention and an expanded prefabricated box including the same are described as follows.

[0026] According to at least one embodiment of the present invention, existing steel rods are separated into wall section steel rods and foundation section steel rods, and the wall section steel rods are formed into a cross shape and the foundation section steel rods into an L shape and arranged in corresponding positions, thereby enabling simple assembly in a pre-processed form before concrete pouring for a precast prefabricated box and an expanded prefabricated box including the same, so that constructability can be significantly improved.

[0027] The present invention relates to a precast prefabricated box and an expanded prefabricated box including the same. By distributing and supporting stress in different directions through a cross-shaped steel bar on the upper side and an L-shaped steel bar on the lower side, local stress concentration is alleviated and crack formation is suppressed, thereby improving structural durability.

[0028] The present invention allows the upper wall section steel rod to be formed in a cross shape, thereby supporting tensile stress occurring in the upper part of the precast prefabricated box in multiple directions, and the lower foundation section steel rod to be formed in an L shape, thereby effectively supporting shear stress and bending stress occurring in the precast prefabricated box, so that the load-bearing stability of the structure can be greatly improved.

[0029] Conventional construction methods resulted in a decrease in structural stability due to leakage occurring in the wall section and the slab, but the present invention can prevent leakage in the slab by pouring concrete into the slab.

[0030] The present invention can prevent leakage in the wall section by welding a second welded joint formed vertically in the wall section of a precast prefabricated box. Through this, labor and construction costs can be reduced by decreasing the construction work related to leakage occurring in the wall section or slab. Brief explanation of the drawing

[0032] FIG. 1 illustrates an expanded prefabricated box according to one embodiment of the present invention. FIG. 2 is an exploded view of the expanded prefabricated box of FIG. 1, showing a plurality of precast prefabricated boxes arranged in a row. Figure 3 shows a cross-sectional view taken along A1-A2 of Figure 1. Figure 4 shows a cross-sectional view taken along B1-B2 of Figure 1. FIG. 5 shows a precast prefabricated box according to one embodiment of the present invention. Figure 6 is an exploded view of the precast prefabricated box of Figure 5. FIG. 7 is a cross-sectional view taken along C1-C2 of FIG. 5, showing a cross-shaped wall section steel rod and an L-shaped foundation section steel rod. FIG. 8 is a cross-sectional view taken along C1-C2 of FIG. 5, illustrating a straight-shaped steel bar for the wall section and an L-shaped steel bar for the foundation section. FIG. 9 shows the state in which concrete is poured on the top of a precast prefabricated box according to one embodiment of the present invention. FIG. 10 illustrates a side view of an extended prefabricated box according to one embodiment of the present invention. FIG. 11 illustrates a state in which a first welded joint and a second welded joint are added between a plurality of precast prefabricated boxes forming an expanded prefabricated box of FIG. 10. Specific details for implementing the invention

[0033] Specific embodiments of the present invention will be described in detail below with reference to the drawings. Furthermore, in describing the present invention, detailed descriptions of related known components or functions are omitted if it is determined that such detailed descriptions may obscure the essence of the invention.

[0034] Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the attached drawings. Identical or similar components are given the same reference number regardless of the drawing symbols, and redundant descriptions thereof will be omitted.

[0035] The suffixes "module" and "part" used for components in the following description are assigned or used interchangeably solely for the ease of drafting the specification, and do not inherently possess distinct meanings or roles.

[0036] In addition, the attached drawings are intended only to facilitate understanding of the embodiments disclosed in this specification, and the technical concept disclosed in this specification is not limited by the attached drawings; it should be understood that all modifications, equivalents, and substitutions included within the spirit and technical scope of the invention are included. Terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but said components are not limited by said terms.

[0037] The terms above are used solely for the purpose of distinguishing one component from another. When a component is referred to as being "connected" or "joined" to another component, it should be understood that while it may be directly connected or joined to that other component, there may also be other components present in between.

[0038] On the other hand, when it is stated that one component is "directly connected" or "directly coupled" to another component, it should be understood that no other component exists in between. A singular expression includes a plural expression unless the context clearly indicates otherwise.

[0039] In this application, terms such as “comprising” or “having” are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0040] In the drawings, the size of components may be exaggerated or reduced for convenience of explanation. For example, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, so the present invention is not necessarily limited to what is illustrated.

[0041] Where an embodiment can be implemented differently, a specific process sequence may be performed differently from the order described. For example, two processes described consecutively may be performed substantially simultaneously or proceed in the reverse order of the description.

[0042] Hereinafter, a precast prefabricated box according to various embodiments of the present invention and an extended prefabricated box including the same will be described with reference to FIGS. 1 to 11.

[0043] The precast prefabricated box (10) according to the present invention may be a 'precast concrete (PC) prefabricated box'. The precast prefabricated box (10) may include or refer to any one of an intermediate prefabricated box (11), a starting prefabricated box (12), and an ending prefabricated box (13), and an extended prefabricated box including the same.

[0044] A plurality of precast prefabricated boxes (10) can be arranged in a line along one direction. For example, a plurality of precast prefabricated boxes (10) can be arranged in a line along the front-back direction. For example, a starting section prefabricated box (12), at least one intermediate section prefabricated box (11), and an ending section prefabricated box (13) can be arranged sequentially along the front-back direction. The starting section prefabricated box (12), at least one intermediate section prefabricated box (11), and an ending section prefabricated box (13) can be connected or combined.

[0045] The starting section prefabricated box (12), at least one intermediate section prefabricated box (11), and the ending section prefabricated box (13) can form an expanded prefabricated box (1). That is, the expanded prefabricated box (1) may include a plurality of precast prefabricated boxes (10) arranged along one direction. The expanded prefabricated box (1) may include a plurality of precast prefabricated boxes (10) arranged along a longitudinal direction. The longitudinal direction may be parallel to the front-back direction.

[0046] The precast prefabricated box (10) can form a hollow shape. For example, the precast prefabricated box (10) can be formed with a through-hole at the front and rear. For example, the precast prefabricated box (10) can be a square frame shape formed with a through-hole along the front and rear.

[0047] A precast prefabricated box (10) may include a wall section (100). The wall section (100) may form the side of the precast prefabricated box (10). For example, the wall section (100) may form both sides of the precast prefabricated box (10). The wall section (100) may be a pair. For example, the wall section (100) may mean or include one or more of a left wall section (101) and a right wall section (102). The left wall section (101) may form the left side of the precast prefabricated box (10).

[0048] The right wall section (102) can form the right side of the precast prefabricated box (10). The left wall section (101) and the right wall section (102) can be spaced apart along one direction. For example, the left wall section (101) and the right wall section (102) can be spaced apart along the left-right direction. The left wall section (101) and the right wall section (102) can be spaced apart along the transverse direction. The transverse direction can be parallel to the left-right direction.

[0049] The wall section (100) may include a wall body (110). The wall body (110) may form the overall appearance of the wall section (100). The wall body (110) may include a main wall body (111). The main wall body (111) may extend in one direction from one end to the other end. For example, the main wall body (111) may extend upward from the bottom to the top.

[0050] The wall body (110) may include a connecting slab support (112). The connecting slab support (112) may be extended or connected to the main wall body (111). For example, the connecting slab support (112) may be formed to extend outward from the outer side of the main wall body (111) toward the precast prefabricated box (10).

[0051] The connecting slab support (112) may include a vertical surface and an inclined surface. The inclined surface of the connecting slab support (112) may be connected to the main wall body (111). For example, the inclined surface of the connecting slab support (112) may be formed at an angle to the main wall body (111) at the bottom of the vertical surface of the connecting slab support (112).

[0052] The inclined surface of the connecting slab support (112) may face or face the lateral lower direction of the precast prefabricated box (10). For example, the inclined surface of the connecting slab support (112) forming the left wall section (101) may face or face the left lower direction of the precast prefabricated box (10). The inclined surface of the connecting slab support (112) forming the right wall section (102) may face or face the right lower direction of the precast prefabricated box (10).

[0053] The wall body (110) may include a wall protrusion (114). The wall protrusion (114) may extend to or be connected to the main wall body (111). For example, the wall protrusion (114) may be formed extending upward from the upper surface of the main wall body (111). The wall protrusion (114) may be connected to a connecting slab support (112). The wall protrusion (114) may form a stepped state with the connecting slab support (112). For example, the upper surface of the wall protrusion (114) may be located above the upper surface of the connecting slab support (112).

[0054] The wall body (110) may include a wall protrusion (115). The wall protrusion (115) may be formed as a groove in the main wall body (111). The wall protrusion (115) may be formed as a groove on the rear surface of the main wall body (111).

[0055] The wall section (100) may include a wall connecting section (120). The wall connecting section (120) may be connected to or coupled to the wall body (110). For example, the wall connecting section (120) may extend forward from the front of the main wall body (111). The front of the wall connecting section (120) may form a step with the front of the main wall body (111). A plurality of precast prefabricated boxes (10) arranged in the front-rear direction may be fitted together. For example, among a pair of precast prefabricated boxes (10) fitted together, the wall connecting section (120) forming the rear precast prefabricated box (10) may be coupled to the wall protrusion (115) forming the front precast prefabricated box (10).

[0056] The wall section (100) may include a wall section steel rod (130). The wall section steel rod (130) may be connected to or coupled to the wall body (110). At least a portion of the wall section steel rod (130) may be embedded or inserted into the wall body (110). The wall section steel rod (130) may be provided in multiple numbers. Multiple wall section steel rods (130) may be spaced apart along one direction. For example, multiple wall section steel rods (130) may be spaced apart along the front-rear direction.

[0057] The wall section steel rod (130) may include a main wall section steel rod (131). The main wall section steel rod (131) may be connected to or coupled to the main wall body (111). A lower portion of the main wall section steel rod (131) may be connected to the upper surface (111T) of the main wall body. For example, the lower portion of the main wall section steel rod (131) may be inserted into the upper surface of the main wall body (111). That is, the upper portion of the main wall section steel rod (131), excluding the portion of the main wall section steel rod (131) embedded in the main wall body (111), may be exposed on top of the wall body (110).

[0058] As described above, the main wall section steel rod (131) can be formed to extend long along the vertical direction. For example, the main wall section steel rod (131) can form an elongated circular rod extended in the vertical direction. The main wall section steel rod (131) can be located inward of the wall protrusion (114). For example, the main wall section steel rod (131) can be located on the opposite side of the connecting slab support (112) relative to the wall protrusion (114).

[0059] The wall section steel rod (130) may include an auxiliary wall section steel rod (132). The auxiliary wall section steel rod (132) may be connected to or combined with the main wall section steel rod (131). The auxiliary wall section steel rod (132) may be embedded within the main wall body (111). The auxiliary wall section steel rod (132) may be formed to extend long along the left-right direction. For example, the auxiliary wall section steel rod (132) may form an elongated circular rod extending in the left-right direction.

[0060] The main wall section steel rod (131) and the auxiliary wall section steel rod (132) may intersect. For example, the main wall section steel rod (131) and the auxiliary wall section steel rod (132) may be orthogonal at the connection point. For example, the wall section steel rod (130) may form a cross shape.

[0061] The wall section steel rod (130) may include a second sheath pipe (133) and a grouting material (134). The insertion work of the wall section steel rod (130) can be performed by aligning the main wall section steel rod (131) with the inserted second sheath pipe (133) and then supplying the grouting material (134) into the second sheath pipe (133). The process of anchoring the wall section steel rod (130) to the wall section (100) can be performed in the following order: pouring concrete into the formwork for the wall section (100) -> inserting the wall section steel rod (130) -> curing the concrete -> anchoring the wall section steel rod (130).

[0062] The wall section steel bar (130) may include a bolting member (135). The bolting member (135) may be connected to the upper part of the main wall section steel bar (131) exposed at the top of the outer slab (310).

[0063] Among the precast prefabricated boxes (10), the starting prefabricated box (12) and the ending prefabricated box (13) may include column tension member placement sections (140). The column tension member placement sections (140) may be formed in the wall body (110). The column tension member placement sections (140) may be provided in multiple numbers. The multiple column tension member placement sections (140) may be formed spaced apart on the wall body (110) along the vertical direction. For example, the left wall section (101) and the right wall section (102) may each have multiple column tension member placement sections (140) formed therein. The column tension member may be connected through the wall section (100) of the multiple precast prefabricated boxes (10) that form the expanded prefabricated box (1). For example, the column tension member may be connected through the wall section (100) arranged in the front-rear direction to provide pre-stress.

[0064] The precast prefabricated box (10) may include a foundation section (200). The foundation section (200) may form the lower part of the precast prefabricated box (10). The foundation section (200) may be connected to or coupled to the wall section (100). The foundation section (200) may be connected to or coupled to the left wall section (101) and the right wall section (102). The left wall section (101) and the right wall section (102) may be spaced apart from the foundation section (200) along the left and right directions.

[0065] The base portion (200) may include an outer base portion (210). The outer base portion (210) may form the lower portion of the base portion (200). The outer base portion (210) may form the lower surface of the precast prefabricated box (10). For example, the lower surface of the outer base portion (210) may be the lower surface of the precast prefabricated box (10).

[0066] The outer foundation part (210) may include an outer foundation part body (211). The outer foundation part body (211) may be referred to as the ‘foundation step section longitudinal side’. The outer foundation part body (211) may extend in one direction from one end to the other end. For example, the outer foundation part body (211) may extend from the left end to the right end to reach the right end.

[0067] The outer base portion (210) may include an outer base portion protrusion (212). The outer base portion protrusion (212) may be extended or coupled to the outer base portion body (211). For example, the outer base portion protrusion (212) may be formed to protrude forward from the front of the outer base portion body (211).

[0068] The outer base portion (210) may include an outer base portion step (213). The outer base portion step (213) may be formed with a step difference from the front of the outer base portion protrusion (212). For example, the outer base portion step (213) may be located behind the front of the outer base portion protrusion (212). The outer base portion step (213) may share the front surface of the outer base body (211).

[0069] When the wall section (100) and the foundation section (200) are joined, the main foundation section steel rod (231) of the foundation section steel rod (230) can be joined to the wall body (110). For example, the main foundation section steel rod (231) can be joined upward to the lower surface of the wall body (110). For example, the main foundation section steel rod (231) can be press-fitted to the lower surface of the wall body (110).

[0070] The foundation section (200) may include an inner foundation section (220). The inner foundation section (220) may be connected to or coupled with the outer foundation section (210). The inner foundation section (220) may be connected or coupled to the outer foundation section (210) at a stepped height. The inner foundation section (220) may be positioned on the inner side of a pair of wall sections (100). For example, when the wall section (100) and the foundation section (200) are combined, the side of the inner foundation section (220) may face or be directed toward the inner surface of the wall body (110). For example, the lower surface of the wall body (110) may be connected to the stepped upper surface of the outer foundation section (210) and the side of the inner foundation section body (221).

[0071] The inner base portion (220) may include an inner base portion body (221). The inner base portion body (221) may extend in one direction from one end to the other end. For example, the inner base portion body (221) may extend from the left end to the right end to reach the right end. The inner base portion body (221) may be located on the upper surface of the outer base portion body (211).

[0072] The inner base portion (220) may include an inner base portion body protrusion (222). The inner base portion body protrusion (222) may be extended or coupled to the inner base portion body (221). For example, the inner base portion body protrusion (222) may be formed extending in the left and right directions from both ends of the inner base portion body (221). The inner base portion body protrusion (222) may include an inner base portion body inclined surface (222T). The inner base portion body inclined surface (222T) may form the upper surface of the inner base portion body protrusion (222). The inner base portion body inclined surface (222T) may face or face the inward upward direction of the precast assembly box (10).

[0073] The base portion (200) may include a base portion steel rod (230). The base portion steel rod (230) may be connected to or coupled to the outer base portion (210). At least a portion of the base portion steel rod (230) may be embedded or inserted into the outer base portion (210). The base portion steel rod (230) may be provided in multiple numbers. The multiple base portion steel rods (230) may be spaced apart along one direction. For example, the multiple base portion steel rods (230) may be spaced apart along the front-rear direction.

[0074] The base steel rod (230) may include a main base steel rod (231). The main base steel rod (231) may be connected to or coupled with the outer base body (211). A lower portion of the main base steel rod (231) may be connected to the upper surface (211T) of the outer base body. For example, the lower portion of the main base steel rod (231) may be drawn into the upper surface of the outer base body (211). That is, the upper portion of the main base steel rod (231), excluding the portion of the main base steel rod (231) embedded in the outer base body (211), may be exposed on top of the outer base (210). As described above, the main base steel rod (231) may be formed to extend long along the vertical direction. For example, the main base steel rod (231) may form an elongated circular rod extending in the vertical direction. The main base steel rod (231) may be located on the outer side of the inner base body protrusion (222). For example, the main base steel rod (231) may be located on the opposite side of the inner base body (221) relative to the inner base body protrusion (222).

[0075] The base steel rod (230) may include an auxiliary base steel rod (232). The auxiliary base steel rod (232) may be connected to or coupled with the main base steel rod (231). The auxiliary base steel rod (232) may be embedded within the outer base body (211). The auxiliary base steel rod (232) may be formed to extend long along the left and right directions. For example, the auxiliary base steel rod (232) may form an elongated circular rod extending in the left and right directions. The end of the main base steel rod (231) may be coupled to the end of the auxiliary base steel rod (232). For example, the bottom of the main base steel rod (231) may be coupled to one end of the auxiliary base steel rod (232). The base steel rod (230) may form a bent shape. For example, the base steel rod (230) may form an overall L shape.

[0076] The foundation steel rod (230) may include a first sheath pipe (233) and a grouting material (234). The insertion operation of the foundation steel rod (230) may be performed by fitting the main foundation steel rod (231) into the inserted first sheath pipe (233) and then supplying the grouting material (234) into the first sheath pipe (233). The process of anchoring the foundation steel rod (230) to the outer foundation (210) may be performed in the following order: pouring concrete into the formwork for the outer foundation (210) -> inserting the foundation steel rod (230) -> curing the concrete -> anchoring the foundation steel rod (230).

[0077] Among the precast prefabricated boxes (10), the starting prefabricated box (12) and the ending prefabricated box (13) may include a foundation tension member placement section (240). The foundation tension member placement section (240) may be formed in the outer foundation section (210). The foundation tension member placement section (240) may be provided in multiple numbers. The multiple foundation tension member placement sections (240) may be spaced apart on the outer foundation section (210) along the left and right directions. The base tension member may be connected through the foundation section (200) of the multiple precast prefabricated boxes (10) that form the expanded prefabricated box (1). For example, the base tension member may be connected through the multiple foundation sections (200) arranged in the front-rear direction to provide pre-stress.

[0078] The precast prefabricated box (10) may include a slab (300). The slab (300) may form the upper part of the precast prefabricated box (10). The slab (300) may be connected to or joined to the wall section (100). The slab (300) may be connected to or joined to the left wall section (101) and the right wall section (102). The left wall section (101) and the right wall section (102) may be spaced apart from the slab (300) along the left and right directions.

[0079] The slab (300) may include an outer slab (310). The outer slab (310) may form the upper portion of the slab (300). The outer slab (310) may form the upper surface of the precast prefabricated box (10). For example, the upper surface of the outer slab (310) may be the upper surface of the precast prefabricated box (10). When the wall portion (100) and the slab (300) are joined, the main wall portion steel rod (131) of the wall portion steel rod (130) may be joined to the outer slab (310). For example, the main wall portion steel rod (131) may be joined by penetrating the outer slab (310) in the vertical direction.

[0080] The outer slab (310) may include an outer slab body (311). The outer slab body (311) may extend in one direction from one end to the other end. For example, the outer slab body (311) may extend from the left end to the right end to reach the right end.

[0081] The outer slab (310) may include an outer slab receiving projection (312). The outer slab receiving projection (312) may be extended or coupled to the outer slab body (311). For example, the outer slab receiving projection (312) may be formed to protrude upward from the upper surface of the outer slab body (311).

[0082] The outer slab receiving protrusions (312) may be a pair. A pair of outer slab receiving protrusions (312) may be spaced apart on the upper surface of the outer slab body (311) along the left-right direction. For example, a pair of outer slab receiving protrusions (312) may be symmetrically spaced apart on the upper surface (311T) of the outer slab body. The outer slab (310) may include a concrete receiving groove (313). The concrete receiving groove (313) may refer to a space enclosed by the outer slab body (311) and a pair of outer slab receiving protrusions (312). For example, concrete (CONC) may be filled into the concrete receiving grooves (313) of a plurality of precast prefabricated boxes (10) connected in the front-rear direction.

[0083] As described above, leakage prevention can be achieved by pouring concrete on the upper part of the precast prefabricated box (10). By preventing leakage, the stability of the PC box is increased, and the speed of road opening can be secured through the pouring of concrete. The concrete (CONC) can completely cover the main wall section steel rod (131) and bolting member (135) exposed on the outer slab (310).

[0084] The slab (300) may include a slab protrusion (320). The slab protrusion (320) may be connected to or coupled with the outer slab (310). The slab protrusion (320) may be connected to or coupled downwardly below the outer slab (310). The slab protrusion (320) may include a slab step portion (321). The slab step portion (321) may extend in one direction from one end to the other end. For example, the slab step portion (321) may extend from the left end to the right end.

[0085] The slab step portion (321) may be located on the front of the outer slab body (311). The slab protrusion (320) may include a slab haunch (322). The slab haunch (322) may be extended or coupled to the outer slab body (311). For example, the slab haunch (322) may be formed extending downward from the lower sides of both ends of the slab step portion (321).

[0086] The slab protrusion (320) may include a slab slope (323). The slab slope (323) may be connected to the slab step (321) and the slab haunch (322). The outer surface of the slab slope (323) may face or be oriented inward downward direction of the precast prefabricated box (10).

[0087] The slab slope (323) can form a slab haunch structure. That is, the slab slope (323) can become progressively thicker toward both the left and right sides of the outer slab body (311). As described above, the strength of the portion of the slab (300) adjacent to the wall portion (100) can be reinforced.

[0088] Among the precast prefabricated boxes (10), the starting prefabricated box (12) and the ending prefabricated box (13) may include slab tension member placement sections (330). The slab tension member placement sections (330) may be formed on the outer slab (310). The slab tension member placement sections (330) may be provided in multiple numbers. The multiple slab tension member placement sections (330) may be spaced apart on the outer slab (310) along the left and right directions. The cover tension member may be connected through the slabs (300) of the multiple precast prefabricated boxes (10) forming the expanded prefabricated box (1). For example, the cover tension member may be connected through the multiple slabs (300) arranged in the front-rear direction to provide pre-stress.

[0089] The expanded prefabricated box (1) may include a first welded joint (20). The first welded joint (20) may be connected or joined between a plurality of precast prefabricated boxes (10). The first welded joint (20) may be connected or joined to the side of the expanded prefabricated box (1). For example, the first welded joint (20) may be placed on the right side or the left side of the expanded prefabricated box (1).

[0090] The first welded joint (20) can be connected to an adjacent pair of precast prefabricated boxes (10) among a plurality of precast prefabricated boxes (10). For example, the first welded joint (20) can be connected to a wall connecting part (120) forming the rear precast prefabricated box (10) and a wall protrusion (115) forming the front precast prefabricated box (10) among a pair of precast prefabricated boxes (10) connected front and rear.

[0091] The first welded joint (20) can be joined to the joint portion between a pair of precast prefabricated boxes (10) by welding. For example, the first welded joint (20) may include a steel plate with dimensions of 5cm x 5cm (width x height). As described above, the first welded joint (20) can increase the joint strength between a pair of precast prefabricated boxes (10) while simultaneously lowering the unit cost.

[0092] The extended prefabricated box (1) may include a second welded joint (30). The second welded joint (30) may be connected or joined between a plurality of precast prefabricated boxes (10). The second welded joint (30) may be connected or joined to the side of the extended prefabricated box (1). For example, the second welded joint (30) may be placed on the right side or the left side of the extended prefabricated box (1).

[0093] The second welded joint (30) can be connected to an adjacent pair of precast prefabricated boxes (10) among a plurality of precast prefabricated boxes (10). For example, the second welded joint (30) can be connected to a wall section (100) forming the rear precast prefabricated box (10) and a wall section (100) forming the front precast prefabricated box (10) among a pair of precast prefabricated boxes (10) connected front and rear.

[0094] The second welded joint (30) can be joined to the joint portion between a pair of precast prefabricated boxes (10) by means of welding. For example, the second welded joint (30) may include a steel plate shape formed long in the vertical direction. As described above, the second welded joint (30) can increase the joint strength between a pair of precast prefabricated boxes (10) while simultaneously lowering the unit cost. The first welded joint (20) and the second welded joint (30) can prevent leakage that may occur between the welded joints of a plurality of precast prefabricated boxes (10).

[0095] Although a precast prefabricated box and an extended prefabricated box including the same according to the embodiments of the present disclosure have been described as specific embodiments, this is merely illustrative and the present disclosure is not limited thereto, and should be interpreted as having the broadest scope in accordance with the basic concept disclosed herein.

[0096] Those skilled in the art may combine or substitute the disclosed embodiments to practice embodiments not specified, and such also does not exceed the scope of the rights of this disclosure. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on this description, and it is evident that such modification or alteration also falls within the scope of the rights of this disclosure. Explanation of the symbols

[0098] 1 : Expanded prefabricated box 10 : Precast assembly box 100 : Wall section 101: Left wall section 102 : Right wall section 11: Middle section prefabricated box 110 : Wall body 111 : Main wall body 111T: Main wall body top surface 112 : Connection slab support 113 : Wall body reinforcement 114 : Wall protrusion 115 : Wall irregularities 12: Prefabricated box at the starting point 120 : Wall connection 13: Terminal prefabricated box 130 : Wall section steel rod 131 : Main wall section steel rod 132 : Auxiliary wall section steel rod 133 : Second sheath 134 : Grouting material 135 : Bolting member 140: Column Tensioning Member Arrangement 20: First welded joint 200 : Basic Section 210 : Outer base 211 : Outer base body 211T : Outer base body upper surface 212 : Outer base part protrusion 213 : Outer base step 220 : Inner base 221 : Inner base body 221T: Inner base body upper surface 222 : Inner base body protrusion 222T: Inner base body slope 230 : Foundation steel bar 231 : Main foundation steel bar 232 : Auxiliary foundation steel bar 233 : 1st Sheath 234 : Grouting material 240 : Foundation tension member placement area 30: Second welded joint 300 : Slab 310 : Outer slab 311 : Outer slab body 311T: Outer slab body upper surface 312 : Outer slab receiving projection 313 : Concrete receiving groove 314 : Protrusion fastening groove 320 : Slab protrusion 321 : Slab step 322 : Slavic Hunch 323 : Slab slope 330 : Slab tension member placement area CONC : Concrete

Claims

Claim 1 A pair of wall sections spaced apart along one direction; a foundation section coupled below the pair of wall sections; and a slab coupled above the pair of wall sections; wherein each of the pair of wall sections comprises a wall body extending in an upward and downward direction; and a wall section steel rod at least partially embedded in the wall body, and wherein the wall section steel rod comprises a main wall section steel rod coupled to the wall body and the slab; and includes an auxiliary wall section steel rod embedded in the wall body and coupled to the main wall section steel rod, wherein the main wall section steel rod and the auxiliary wall section steel rod are cross-coupled, and the wall section steel rod is configured in a cross shape, and the main wall section steel rod is received in a second sheath pipe disposed across the connection area between the wall body and the slab, and grouting material is filled inside the second sheath pipe, and the foundation section includes an outer foundation section connected to the lower surface of the pair of wall bodies; an inner foundation section extended and formed above the outer foundation section and connected to the side of the wall body; and a foundation section steel rod with at least a portion embedded in the outer foundation section, wherein the foundation section steel rod comprises a main foundation section steel rod coupled to the wall body and the outer foundation section; and includes an auxiliary foundation steel bar that is embedded in the outer foundation and is bent and extended from the end of the main foundation steel bar, wherein the main foundation steel bar and the auxiliary foundation steel bar form an L shape, the main foundation steel bar is received in a first sheath pipe disposed across the connection area between the wall body and the outer foundation, and the interior of the first sheath pipe is filled with grouting material, the cross-shaped wall steel bar is disposed in the connection area between the slab and the wall body, and the L-shaped foundation steel bar is disposed in the connection area between the wall body and the outer foundation, so that the wall steel bar and the foundation steel bar are each independently embedded in upper and lower positions spaced apart from each other, and the slab is an outer slab connected to the upper surface of the pair of wall bodies;A precast prefabricated box comprising a slab protrusion formed below the outer slab and having a slab haunch structure, wherein the slab protrusion comprises a slab stepped portion, a slab haunch, and a slab inclined portion connecting the slab stepped portion and the slab haunch, and wherein the slab inclined portion is formed to face the inner lower direction of the precast prefabricated box. Claim 2 delete Claim 3 delete Claim 4 A precast prefabricated box according to claim 1, further comprising a bolting member coupled to the upper part of the main wall member steel rod exposed above the outer slab. Claim 5 A precast prefabricated box according to claim 1, wherein the second sheath pipe and the first sheath pipe are each formed to extend along the insertion direction of the wall section steel rod and the foundation section steel rod, and the grouting material anchors the main wall section steel rod and the main foundation section steel rod, respectively, inside the second sheath pipe and the first sheath pipe. Claim 6 An expanded prefabricated box in which a plurality of precast prefabricated boxes according to claim 1 are arranged in a row along the front-rear direction, wherein each of the plurality of precast prefabricated boxes includes a wall connecting part formed protruding forward from the wall body and a wall protrusion corresponding to the wall connecting part, and wherein the wall connecting part of one of the adjacent pair of precast prefabricated boxes is fitted and coupled to the wall protrusion of the other precast prefabricated box. Claim 7 In claim 6, the expanded prefabricated box comprises a first welded joint, wherein the first welded joint is formed in a wall connecting portion forming the rear prefabricated box and a wall protrusion forming the front prefabricated box among a pair of prefabricated prefabricated boxes connected front and rear. Claim 8 In claim 7, the expanded prefabricated box comprises one or more second welded joints located on the right or left side of the plurality of precast prefabricated boxes, wherein the one or more second welded joints are formed vertically in the side joint between the wall portion of the rear precast prefabricated box and the wall portion of the front precast prefabricated box among a pair of precast prefabricated boxes connected front and back.

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