Precast floor structure

Abstract

The objective is to enable the easy reuse of precast floor slabs while transferring shear force between the ends of adjacent precast floor slabs during an earthquake. [Solution] The precast floor structure comprises a beam 26 having a shear connector 30 on its upper surface 26U, a pair of precast floor slabs 42 whose respective ends are adjacent on the upper surface 26U of the beam 26 and each end has a recess 44 formed therein that surrounds the shear connector 30 in a mutually opposing state, a filling hardening material 70 that is filled into the mutually opposing recesses 44 and into which the shear connector 30 is embedded, and a tensioning member 50 that is positioned across the pair of precast floor slabs 42 in a tensioned state and applies compressive force to the filling hardening material 70.

Description

Technical Field

[0001] The present invention relates to a precast floor structure.

Background Art

[0002] In a steel beam, the longitudinal direction of a rectangular PC slab is spanned, the PC slab is laid over several spans in the width direction of the PC slab, concrete is placed in the gap between adjacent PC slabs above the steel beam, and PC steel wires are passed through sleeves embedded in the PC slabs over several spans, and the PC steel wires are tensioned and integrated. Thus, a floor slab made of PC slabs that can withstand loads in both the longitudinal and width directions of the PC slab is known (for example, see Patent Document 1).

[0003] Also, a floor slab is known that spans a large number of PC slabs between both beams in the longitudinal direction thereof and is configured to be integrated by introducing PC steel wires that penetrate each PC slab in the width direction thereof (for example, see Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the technology disclosed in Patent Document 1, as described above, concrete is placed over the entire length between the ends of adjacent precast floor slabs to integrate these precast floor slabs. Thereby, during an earthquake, shear force is transmitted through the concrete between the ends of adjacent precast floor slabs.

[0006] However, if concrete is poured over the entire length between the ends of adjacent precast slabs, reusing these slabs may require cutting the concrete poured over the entire length between the ends, which can be time-consuming.

[0007] In consideration of the above facts, the present invention aims to enable the easy reuse of precast floor slabs while transmitting shear force between the ends of adjacent precast floor slabs during an earthquake. [Means for solving the problem]

[0008] The precast floor structure according to claim 1 comprises: a beam having a shear connector on its upper surface; a pair of precast floor slabs, each having adjacent ends on the upper surface of the beam, and each end having a recess formed thereon that faces each other and surrounds the shear connector; a filling hardening material that is filled into the opposing recesses and in which the shear connector is embedded; and a tensioning member that is positioned across the pair of precast floor slabs in a tensioned state and applies compressive force to the filling hardening material.

[0009] According to the precast floor structure of claim 1, the beam has a shear connector on its upper surface. On the upper surface of this beam, the ends of a pair of precast floor slabs are adjacent to each other. Also, recesses are formed at the ends of each of the pair of precast floor slabs, facing each other, surrounding the shear connector. A hardening filler is filled into these recesses.

[0010] Shear connectors are embedded in the hardening material. Additionally, tensioning members are positioned across a pair of precast slabs in a tensioned state, applying compressive force to the hardening material. This connects the beams and the pair of precast slabs via the shear connectors and hardening material, enabling the transmission of shear forces.

[0011] In this configuration, during an earthquake, shear force is transmitted between the ends of a pair of precast slabs via a hardening filler material. Furthermore, as mentioned earlier, compressive force is applied to the hardening filler material by tensioning members. This suppresses rupture of the hardening filler material during an earthquake. Therefore, shear force can be transmitted more reliably between the ends of a pair of precast slabs during an earthquake.

[0012] Furthermore, by releasing the tension of the tensioning material and, for example, by core-drilling the filling material, the pair of precast slabs can be separated. Therefore, in the present invention, compared to a configuration in which concrete is filled along the entire length between the ends of the pair of precast slabs, the pair of precast slabs can be easily reused.

[0013] Thus, in this invention, during an earthquake, shear force can be transmitted between the ends of adjacent precast floor slabs, while also making it possible to easily reuse precast floor slabs.

[0014] The precast floor structure according to claim 2 is the precast floor structure according to claim 1, wherein the tensioning member penetrates the filling and hardening material and is arranged across a pair of precast floor slabs.

[0015] According to the precast floor structure of claim 2, the tensioning member is positioned across a pair of precast floor slabs, penetrating the hardening material. This tensioning member directly applies compressive force to the hardening material. Therefore, fracture of the hardening material during an earthquake is further suppressed.

[0016] The precast floor structure according to claim 3 is the precast floor structure according to claim 2, wherein through holes are formed in the opposing surfaces of the recesses that face each other, into which the tensioning material is slidably inserted, and connecting members are embedded in the filling hardening material, connecting to the through holes formed in the opposing surfaces, into which the tensioning material is slidably inserted.

[0017] According to the precast floor structure according to claim 3, in a pair of precast floor slabs, through holes are respectively formed on the opposing surfaces of the recesses facing each other. A tension member is slidably inserted into these through holes.

[0018] Also, connection members are embedded in the filled and hardened material filled in the recesses facing each other. The connection members connect the through holes respectively formed on the opposing surfaces of the recesses facing each other, and a tension member is slidably inserted therein.

[0019] By slidably inserting the tension member into the through holes of the pair of precast floor slabs and the connection members in this way, the tension member can be easily removed from the pair of precast floor slabs and the connection members. Therefore, the pair of precast floor slabs can be reused more easily.

[0020] The precast floor structure according to claim 4 is the precast floor structure according to any one of claims 1 to 3, wherein the filled and hardened material is not filled between the ends of the adjacent precast floor slabs.

[0021] According to the precast floor structure according to claim 4, the filled and hardened material is not filled between the ends of the adjacent precast floor slabs. Therefore, in the present invention, compared with the configuration in which concrete is filled over the entire length between the ends of the pair of precast floor slabs, the pair of precast floor slabs can be reused more easily.

[0022] The precast floor structure according to claim 5 is the precast floor structure according to any one of claims 1 to 3, wherein the strength of the filled and hardened material is higher than the strength of the precast floor slab.

[0023] According to the precast floor structure according to claim 5, the strength of the filled and hardened material is higher than the strength of the precast floor slab. Thereby, breakage of the filled and hardened material during an earthquake is further suppressed.

Advantages of the Invention

[0024] As described above, according to the present invention, during an earthquake, it is possible to easily make the precast floor slab reusable while transmitting shear force between the ends of adjacent precast floor slabs.

Brief Description of the Drawings

[0025] [Figure 1] It is a plan view showing a slab to which a precast floor structure according to an embodiment is applied. [Figure 2] It is a sectional view taken along line 2-2 of FIG. 1. [Figure 3] It is a sectional view taken along line 3-3 of FIG. 2. [Figure 4] It is a partially enlarged plan view of FIG. 1 showing a fixing portion of a tension member to a precast floor slab. [Figure 5] It is a sectional view corresponding to FIG. 3 showing the construction process of the slab shown in FIG. 1. [Figure 6] It is a sectional view corresponding to FIG. 3 showing the construction process of the slab shown in FIG. 1.

Mode for Carrying Out the Invention

[0026] Hereinafter, a precast floor structure according to an embodiment will be described with reference to the drawings. Note that the arrows X and Y shown in each figure indicate two horizontal directions perpendicular to each other.

[0027] (Structure) In FIG. 1, a slab 40 of a predetermined floor of a structure 10 to which a precast floor structure according to the present embodiment is applied is shown. The structure 10 includes a plurality of continuous planar frameworks 20, and the slab 40 is supported by these planar frameworks 20.

[0028] (Planar framework) The planar frame 20 comprises a plurality of columns 22 erected at intervals in two horizontal directions (arrows X and Y directions), a plurality of main beams 24 installed between adjacent columns 22, and a plurality of secondary beams 26 installed between opposing main beams 24 in a predetermined direction (arrow Y direction), forming a rectangular frame shape in plan view. A slab 40 is provided on this planar frame 20. Note that the main beams 24 and secondary beams 26 are examples of beams.

[0029] The planar frame 20 is, for example, made of steel. Specifically, the columns 22 are made of steel columns formed from square steel pipes. The main beams 24 and secondary beams 26 are made of steel beams formed from H-shaped steel.

[0030] The basic configurations of the main beam 24 and the secondary beam 26 are the same. Therefore, the configuration of the secondary beam 26 will be explained below, and the explanation of the configuration of the main beam 24 will be omitted as appropriate.

[0031] As shown in Figure 2, the joist 26 has a pair of upper flange portions 26A and lower flange portions (not shown) that face each other in the vertical direction, and a web portion 26B that connects the upper flange portion 26A and the lower flange portion. A shear connector 30 is provided on the upper flange portion 26A.

[0032] The shear connectors 30 are shear force transmission members that transmit shear force between the beam 26 and the slab 40, and multiple shear connectors are provided at intervals in the axial direction of the beam 26. Each shear connector 30 is, for example, a shear prevention plate joined to the upper flange portion 26A of the beam 26.

[0033] Each shear connector 30 is positioned along the web portion 26B of the beam 26 in a plan view, and its lower end is joined to the upper surface 26U of the upper flange portion 26A of the beam 26 by welding or the like. Each shear connector 30 also has a through hole 32.

[0034] The through-hole 32 is a circular hole that penetrates the shear connector 30 in the thickness direction. By filling this through-hole 32 with the filler hardening material 70 described later, the adhesion (integration) between the shear connector 30 and the filler hardening material 70 is enhanced.

[0035] Note that the shear connector 30 is not limited to a slip-prevention plate; for example, it may be a headed stud or the like.

[0036] Furthermore, the planar frame 20 is not limited to steel frame construction; for example, it may be reinforced concrete or steel-reinforced concrete. In other words, the columns 22, main beams 24, and secondary beams 26 are not limited to steel frame construction; for example, they may be reinforced concrete or steel-reinforced concrete. Also, the direction of erection, number, and arrangement of the secondary beams 26 can be omitted as appropriate.

[0037] (Slavic) Slab 40 is made of reinforced concrete. This slab 40 has multiple precast floor slabs 42 and is constructed using the precast method. The multiple precast floor slabs 42 are formed of precast concrete.

[0038] Multiple precast slabs 42 are formed in a rectangular shape with the predetermined direction (arrow Y direction) as the longitudinal direction in a plan view, and are erected on main beams 24 facing each other in the predetermined direction. In addition, multiple precast slabs 42 are arranged in a direction perpendicular to the predetermined direction (arrow X direction), and are erected on adjacent secondary beams 26.

[0039] In the following, the direction indicated by arrow X will be referred to as the installation direction of the precast slab 42. Furthermore, the installation direction of the precast slab 42 can be changed as appropriate depending on the arrangement of the main beams 24 and secondary beams 26.

[0040] (recess) As shown in Figure 3, multiple recesses 44 are formed at the ends of adjacent precast floor slabs 42, each surrounding a plurality of shear connectors 30 that protrude from the upper surface 26U of the aforementioned beam 26. The plurality of recesses 44 are formed at predetermined intervals (pitch) at the ends of adjacent pairs of precast floor slabs 42, according to the spacing (pitch) of the plurality of shear connectors 30.

[0041] Each recess 44 is formed by recessing the end of the precast floor slab 42 in an arc shape (semicircular shape) when viewed from above. By aligning (combining) the recesses 44 formed at the ends of adjacent pairs of precast floor slabs 42, a filling space 46 surrounding the shear connector 30 is formed.

[0042] The edges of opposing recesses 44 are in contact via a sealing material (formwork) 48 such as a packing. This sealing material 48 closes the gap between the edges of the opposing recesses 44. In addition, the sealing material 48 creates a gap G between the ends of adjacent pairs of precast floor slabs 42, except in the filled space 46. This gap G is not filled with the hardening material 70, and the edges between the ends of adjacent pairs of precast floor slabs 42 are structurally separated.

[0043] The filling space 46 is a circular through-hole that penetrates the ends of an adjacent pair of precast floor slabs 42 in the thickness direction, and is positioned so as to fit within the upper surface 26U of the upper flange portion 26A of the beam 26 in a plan view. As a result, the opening at the lower end of the filling space 46 is closed by the upper surface 26U of the upper flange portion 26A of the beam 26.

[0044] Furthermore, the recess 44 is not limited to an arc shape in plan view; for example, it may be semi-elliptical or rectangular in plan view. Similarly, the filling space 46 is not limited to a circular shape in plan view; for example, it may be elliptical or rectangular in plan view.

[0045] The opposing surfaces 44T of the opposing recesses 44 each have through holes 52 into which tensioning members 50 are slidably inserted. The through holes 52 are circular in shape and penetrate the precast slab 42 in the erection direction (arrow X direction). As an example, these through holes 52 are formed by sleeves (cylindrical pipes) 54 embedded inside the precast slab 42.

[0046] (Connecting component) As shown in Figure 2, a connecting member 60 is placed in the filling space 46. The connecting member 60 is a hollow member that connects the through holes 52 formed in the opposing surfaces 44T of the opposing recesses 44. A tensioning member 50 is slidably inserted inside the connecting member 60. The tensioning member 50 is placed across a pair of adjacent precast floor slabs 42 via this connecting member 60.

[0047] The connecting member 60 is formed, for example, in a cylindrical shape. Furthermore, the connecting member 60 is formed in a bellows-like shape using resin or the like, and is expandable and contractible in the axial direction. This connecting member 60 is housed within the filling space 46 in a compressed state in the axial direction. As a result, both ends of the connecting member 60 are pressed against the opposing surfaces 44T of the opposing recesses 44. In this state, the through holes 52 formed in the opposing surfaces 44T of the opposing recesses 44 are connected by the connecting member 60.

[0048] In this embodiment, the connecting member 60 is made expandable and contractible in the axial direction, but the connecting member 60 may not be expandable and contractible in the axial direction. In this case, for example, the gap between the opposing surfaces 44T of the opposing recesses 44 and both ends of the connecting member 60 may be sealed with a sealing material or the like.

[0049] (Filled hardening material) The filling space 46 is filled with a hardening material 70. The hardening material 70 is, for example, concrete (ordinary concrete) of the same strength as the concrete forming the precast slab 42. A shear connector 30 is embedded in this hardening material 70. As a result, the joist 26 and a pair of adjacent precast slabs 42 are joined together via the shear connector 30 and the hardening material 70 in a way that allows for the transmission of shear forces.

[0050] Furthermore, a connecting member 60 is embedded in the filling and hardening material 70, through which the tensioning material 50 slides. This suppresses adhesion between the filling and hardening material 70 and the tensioning material 50.

[0051] (Tension material) As shown in Figure 1, the tensioning member 50 is formed from PC steel materials such as PC steel bars or PC steel wires. This tensioning member 50 is arranged across multiple precast slabs 42 that are aligned in the erection direction (arrow X direction) by the unbonded construction method. In this embodiment, the tensioning member 50 is arranged across four precast slabs 42.

[0052] Of the four precast floor slabs 42, the ends of the tension members 50 are anchored to the precast floor slabs 42 located at both ends (hereinafter referred to as "anchored precast floor slabs 42E"). Specifically, as shown in Figure 4, the anchored precast floor slabs 42E are provided with anchoring devices 80 for anchoring the ends of the tension members 50.

[0053] (Fixing device) The anchoring device 80 is embedded in the middle of the precast deck slab 42E in the direction of installation (arrow X direction). The anchoring device 80 has a pair of guide parts 84 that guide the tensioning member 50, which is inserted into the through hole 52 of the precast deck slab 42E, to the upper surface of the precast deck slab 42.

[0054] Specifically, one end of the pair of guide sections 84 is connected to the through-hole 52 of the anchoring precast floor slab 42E. The other end of the pair of guide sections 84 is connected to a groove 56 formed on the upper surface of the anchoring precast floor slab 42E. Furthermore, the pair of guide sections 84 extend upward from the through-hole 52 of the anchoring precast floor slab 42E and in a direction away from each other in a plan view, reaching the groove 56 formed on the upper surface of the precast floor slab 42.

[0055] The end of the tensioning member 50 is guided by the guide portion 84 into the groove portion 56 through the through hole 52 of the anchoring precast floor slab 42E, and is anchored to the anchoring device 80 by the anchoring body 86 within the groove portion 56. At this time, tension is applied to the tensioning member 50, and the tensioning member 50 is anchored to the anchoring device 80 in a taut state.

[0056] As a result, compressive force (prestress) is introduced to adjacent precast slabs 42, and, as shown in Figure 3, compressive force P is applied to the hardened filling material 70 that is filled into the filling space 46 formed between the ends of adjacent precast slabs 42.

[0057] Furthermore, the tensioning members 50 only need to be placed across at least one adjacent pair of precast floor slabs 42. In addition, the pair of guide parts 84 of the anchoring device 80 may guide the tensioning members 50 not only on the upper surface of the precast floor slabs 42, but also on the lower surface of the precast floor slabs 42.

[0058] Furthermore, the method of fixing the tensioning member 50 to the precast floor slab 42 can be changed as appropriate. For example, the end of the tensioning member 50 may be fixed to the end face of the precast floor slab 42.

[0059] (Construction method for precast floor structures) Next, an example of a construction method for the precast floor structure according to this embodiment will be described.

[0060] Furthermore, the construction method for the joint between the main beam 24 and the precast slab 42 is the same as the construction method for the joint between the secondary beam 26 and the precast slab 42. Therefore, the following explanation will focus on the construction method for the joint between the secondary beam 26 and the precast slab 42, and the explanation of the construction method for the joint between the main beam 24 and the precast slab 42 will be omitted as appropriate.

[0061] First, as shown in Figure 5, in the precast slab installation process, precast slabs 42 are erected on adjacent beams 26. Shear connectors 30 are pre-installed on the upper surface 26U of the beams 26. Then, the ends of a pair of adjacent precast slabs 42 are placed on the upper surface 26U of the beams 26.

[0062] In this case, as shown in Figure 6, recesses 44 formed at the ends of an adjacent pair of precast floor slabs 42 are positioned opposite each other so as to surround the shear connector 30 protruding from the upper surface 26U of the beam 26. The edges of the opposing recesses 44 are also brought into contact with each other via a sealing material 48. This creates a filling space 46 by the opposing recesses 44, and a gap G is formed between the ends of the adjacent pair of precast floor slabs 42 outside of the filling space 46.

[0063] Next, in the connecting member installation process, the connecting member 60 is installed in the filling space 46 in a contracted state in the axial direction. Then, within the filling space 46, the connecting member 60 is extended in the axial direction, and both ends of the connecting member 60 are pressed against the peripheral edges of the through holes 52 formed on the opposing surfaces 44T of the pair of recesses 44. In this way, the through holes 52 formed on the opposing surfaces 44T of the pair of recesses 44 are connected by the connecting member 60.

[0064] Next, in the tensioning member installation process, the tensioning members 50 are slidably inserted into the through holes 52 and connecting members 60 of the multiple precast floor slabs 42 arranged in the erection direction, thereby positioning the tensioning members 50 across the multiple precast floor slabs 42.

[0065] Next, in the filling process, as shown in Figure 3, a filling hardening material 70 is filled into the filling space 46 formed between the ends of adjacent precast floor slabs 42 and allowed to harden. As a result, shear connectors 30 are embedded in the filling hardening material 70, and the joists 26 and the pair of adjacent precast floor slabs 42 are joined via the shear connectors 30 in a way that allows for the transmission of shear force. In addition, connecting members 60 are embedded in the filling hardening material 70.

[0066] Next, in the tensioning process, as shown in Figure 4, the tensioning member 50 is tensioned using jacks or the like (not shown), and both ends of the tensioning member 50 are fixed to the fixing devices 80 of the fixed precast floor slab 42E. As a result, adjacent precast floor slabs 42 are joined together by pressure via the filling and hardening material 70 to form the slab 40. Prestress is also introduced to the adjacent precast floor slabs 42 and the filling and hardening material 70.

[0067] (Method for dismantling precast floor structures) Next, an example of a method for dismantling a precast floor structure according to this embodiment will be described.

[0068] First, in the tensioning member removal process, as shown in Figure 4, the tensioning members 50 are released from their attachment to the anchoring devices 80 of the precast floor slab 42E. Then, the tensioning members 50 are removed from the through holes 52 and connecting members 60 of the multiple precast floor slabs 42.

[0069] Next, in the drilling process, a core drilling machine (not shown) or the like drills a hole in the hardened filling material 70 in which the shear connector 30 is embedded, separating the shear connector 30 from the pair of precast floor slabs 42.

[0070] Next, in the precast slab removal process, the precast slabs 42 are removed as appropriate from the upper surface 26U of the beams 26. This makes the precast slabs 42 reusable.

[0071] (Mechanism of Action and Effects) Next, the operation and effects of this embodiment will be described.

[0072] As shown in Figure 2, according to the precast floor structure of this embodiment, the joist 26 has a shear connector 30 on its upper surface 26U. On the upper surface 26U of the joist 26, the ends of a pair of precast floor slabs 42 are adjacent to each other. Also, at each end of the pair of precast floor slabs 42, recesses 44 are formed that surround the shear connector 30, facing each other. A hardening material 70 is filled into these recesses 44.

[0073] Shear connectors 30 are embedded in the hardening material 70. Furthermore, tensioning members 50 are positioned across a pair of precast slabs 42 in a tensioned state, applying compressive force to the hardening material 70. This connects the beams 26 and the pair of precast slabs 42 via the shear connectors 30 and the hardening material 70, enabling the transmission of shear force.

[0074] In this configuration, during an earthquake, shear force is transmitted between the ends of the pair of precast floor slabs 42 via the hardening filler material 70. Furthermore, as mentioned above, compressive force is applied to the hardening filler material 70 by the tensioning member 50. This suppresses fracture of the hardening filler material 70 during an earthquake. Therefore, shear force can be transmitted more reliably between the ends of the pair of precast floor slabs 42 during an earthquake.

[0075] Furthermore, by releasing the tension of the tensioning material 50 and, for example, by core-drilling the filling and hardening material 70, the pair of precast slabs 42 can be separated. Therefore, in this embodiment, compared to a configuration in which concrete is filled over the entire length between the ends of the pair of precast slabs 42, the pair of precast slabs 42 can be easily reused.

[0076] Thus, in this embodiment, during an earthquake, the shear force can be transmitted between the ends of adjacent precast floor slabs 42, and the precast floor slabs 42 can be easily reused.

[0077] Furthermore, the tensioning member 50 penetrates the hardening filling material 70 and is positioned across a pair of precast floor slabs 42. This tensioning member 50 directly applies compressive force to the hardening filling material 70. Therefore, fracture of the hardening filling material 70 during an earthquake is further suppressed.

[0078] Furthermore, in a pair of precast floor slabs 42, through holes 52 are formed in the opposing surfaces 44T of the recesses 44 that face each other. Tension members 50 are slidably inserted into these through holes 52.

[0079] Furthermore, connecting members 60 are embedded in the hardening material 70 that is filled into the opposing recesses 44. The connecting members 60 connect through holes 52 formed in the opposing surfaces 44T of the opposing recesses 44. Tensioning members 50 are slidably inserted into these through holes 52 and the connecting members 60.

[0080] By slidingly inserting the tensioning members 50 into the through holes 52 of the pair of precast floor slabs 42 and the connecting members 60 in this manner, the tensioning members 50 can be easily removed from the pair of precast floor slabs 42 and the connecting members 60. Therefore, the pair of precast floor slabs 42 can be reused even more easily.

[0081] Furthermore, the connecting member 60 is designed to be expandable and contractible in the axial direction. This allows the connecting member 60 to easily press both ends against the periphery of the through holes 52 formed in the opposing surfaces 44T of the opposing recesses 44. Therefore, the penetration of the filling hardening material 70 into the through holes 52 and the connecting member 60 can be easily suppressed.

[0082] Furthermore, the hardening material 70 is not filled between the ends of adjacent precast slabs 42. Therefore, in this embodiment, compared to a configuration in which concrete is filled along the entire length between the ends of a pair of precast slabs 42, a pair of precast slabs 42 can be easily reused.

[0083] (modified version) Next, a modified example of the above embodiment will be described.

[0084] In the above embodiment, the filling and hardening material 70 is, for example, concrete of the same strength as the concrete forming the precast slab 42 (ordinary concrete). However, the filling and hardening material 70 may be made of concrete with a higher strength than the concrete forming the precast slab 42 (high-strength concrete). This further suppresses fracture of the filling and hardening material 70 during earthquakes. Alternatively, the filling and hardening material 70 may be made of concrete with a lower strength than the concrete forming the precast slab 42.

[0085] Furthermore, the filling and hardening material 70 is not limited to concrete; it may also be mortar, etc. In other words, the filling and hardening material 70 may be concrete, mortar, or other cement-based filling and hardening materials. Alternatively, the filling and hardening material 70 may be, for example, a resin-based filling and hardening material such as an adhesive.

[0086] Furthermore, in the above embodiment, the tensioning member 50 is positioned across a pair of adjacent precast floor slabs 42, penetrating the filling and hardening material 70. However, the tensioning member 50 only needs to be capable of applying compressive force to the filling and hardening material 70, and may, for example, be positioned across a pair of adjacent precast floor slabs 42 on both sides of the filling and hardening material 70 (filling space 46).

[0087] Although one embodiment of the present invention has been described above, the present invention is not limited to these embodiments, and various modifications may be used in appropriate combinations with one embodiment, and of course, the invention can be implemented in various forms without departing from the spirit of the present invention. [Explanation of Symbols]

[0088] 24 Large beam (beam) 26 Small beam (beam) 26U top 30 Shear Connectors 42 Precast floor slabs 42E Precast floor slab for anchoring (precast floor slab) 44 recess 44T Opposite surface 50 Tensile material 52 Through hole 60 Connecting Member 70 Filling hardening material

Claims

1. A beam having a shear connector on its upper surface, A pair of precast floor slabs, each having adjacent ends on the upper surface of the beam, and each end having recesses that surround the shear connector in a mutually opposing manner; A filling and hardening material is provided to be filled into the recesses facing each other, and into which the shear connector is embedded, A tensioning member is positioned across a pair of precast floor slabs in a tensioned state to apply compressive force to the filling and hardening material, A precast floor structure equipped with this feature.

2. The tensioning member is positioned across a pair of precast floor slabs, penetrating the filling and hardening material. The precast floor structure according to claim 1.

3. Through holes are formed on the opposing surfaces of the recesses that face each other, into which the tensioning material is slidably inserted. The filling and hardening material has connecting members embedded in it, which connect the through holes formed on the opposing surfaces and into which the tensioning material is slidably inserted. The precast floor structure according to claim 2.

4. The gap between the ends of adjacent precast floor slabs is not filled with the hardening filler. A precast floor structure according to any one of claims 1 to 3.

5. The strength of the aforementioned filling and hardening material is higher than the strength of the aforementioned precast slab. A precast floor structure according to any one of claims 1 to 3.

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