Horizontal connecting joint of prefabricated concrete floor slab

Abstract

The utility model provides a horizontal connection node of precast concrete floors, which is used at a horizontal joint position of two precast concrete floors and can be used for quickly connecting the two floors under the condition that ribs are not exposed on the side edges of the floors. And in the connecting process, a concrete pouring procedure is not needed, and construction is convenient. The horizontal connecting joint comprises a steel anchor box, a connecting piece and a pre-embedded sleeve, the pre-embedded sleeve provided with an internal threaded hole is pre-embedded in the floor slab B; the steel anchor box is pre-buried in the floor A, and the upper end of the steel anchor box is open; the upper end opening of the steel anchor box is flush with the upper surface of the floor A; the connecting piece comprises a connecting screw rod, a supporting base plate, a fastening base plate and a fastening nut; the supporting base plate is positioned between horizontal joints of the floor A and the floor B; one end of the connecting screw rod penetrates through the supporting base plate, extends into the pre-embedded sleeve and is in threaded connection with the pre-embedded sleeve; the part, extending into the steel anchor box, of the connecting screw rod is sequentially sleeved with a fastening base plate and a fastening nut, and the fastening nut tightly presses the steel anchor box through the fastening base plate.

Description

Technical Field

[0001] The utility model relates to a connection node, in particular to a horizontal connection node of a prefabricated concrete floor slab, and belongs to the technical field of assembled concrete buildings. Background Art

[0002] As the number of domestic construction workers continues to decrease, and the country continues to pay attention to resource conservation and environmental protection awareness, more and more projects in the construction industry use prefabricated construction technology. In projects such as responding to emergencies and post-disaster reconstruction, the rapid and large-scale construction of temporary or permanent houses is a major task facing our country. Traditional prefabricated construction technology has a large number of components and complex connection nodes, making it difficult to solve the problem of efficient construction. Prefabricated concrete box houses are a new type of prefabricated construction technology. The prefabricated concrete box modules produced in the factory can be assembled on site to complete the construction of the house. It has the advantages of fast speed, high quality and controllable cost. In order to ensure structural safety and improve construction efficiency, the connection nodes between prefabricated concrete box modules are a key issue that needs to be solved in the construction of this type of house.

[0003] At present, for the connection nodes between the roof slabs of precast concrete box-type houses, the connection between adjacent slabs is generally achieved by pouring concrete after the steel bars are extended from the side of the slab. This solution requires reserving steel bars on the side of the precast slab components. The molds required for the production of precast slab components are complex. The construction site needs to support the template, tie the steel bars, and pour concrete. A series of processes are required. In addition, since it takes a long time to maintain after pouring concrete before the next process can be carried out, the efficiency of on-site construction is slow, especially in winter construction. This disadvantage is particularly significant. Utility Model Content

[0004] In view of this, the utility model provides a horizontal connection node of a precast concrete floor slab, which is used for the horizontal joint position of two precast concrete floor slabs, and can quickly connect the two floor slabs without reinforcement on the side of the floor slab; and during the connection process, no concrete pouring process is required, the construction is convenient, and the requirements of efficient on-site construction can be met.

[0005] The technical solution of the utility model is: a horizontal connection node of a precast concrete floor slab, comprising: a steel anchor box, a connecting piece and a pre-embedded sleeve;

[0006] Let the two precast concrete horizontal slabs to be connected be slab A and slab B respectively;

[0007] The embedded sleeve is embedded in the floor slab B, and an internal threaded hole is provided at one end of the embedded sleeve facing the horizontal joint;

[0008] The steel anchor box is pre-buried in the floor A, and the upper end of the steel anchor box is open; the upper end opening of the steel anchor box is flush with the upper surface of the floor A, and a hole is opened at a position corresponding to the upper end opening of the steel anchor box on the upper surface of the floor A;

[0009] The connecting part includes: a connecting screw, a supporting pad, a fastening pad and a fastening nut; the supporting pad is located between the horizontal joints of the floor A and the floor B; one end of the connecting screw passes through the supporting pad and extends into the internal threaded hole in the embedded sleeve, and is threadedly connected to the embedded sleeve; the other end extends into the steel anchor box, and the part of the connecting screw extending into the interior of the steel anchor box is sequentially covered with a fastening pad and a fastening nut, and the fastening nut presses the steel anchor box through the fastening pad.

[0010] Preferably, the connecting member further comprises a stop nut threadedly connected to the outer side of the fastening nut on the connecting screw.

[0011] Preferably: the tensile sleeve comprises: a threaded tube and shear-resistant steel bars;

[0012] The threaded tube is arranged in the plane where the horizontal joint is located, in a direction perpendicular to the length of the horizontal joint; a central blind hole with an internal thread is arranged at one end of the threaded tube facing the horizontal joint; a through hole is radially arranged on the circumferential surface of the other end of the threaded tube for penetrating the shear steel bars; the axial direction of the shear steel bars is parallel to the length direction of the horizontal joint.

[0013] A plurality of shear-resistant steel bars are arranged at intervals along the axial direction of the threaded tube.

[0014] Preferably: the steel anchor box is a hollow cubic structure with an open top formed by welding a steel vertical plate, a steel horizontal plate, a steel bottom plate and a steel anchor plate;

[0015] The steel vertical plates, steel horizontal plates, steel bottom plates and steel anchor plates are all rectangular steel plates; the steel vertical plates and steel anchor plates are arranged opposite to each other and are parallel to the length direction of the horizontal joint; the two steel horizontal plates are located between the steel vertical plates and the steel anchor plates, and are arranged at intervals along the length direction of the horizontal joint, and the two ends are welded to the steel vertical plates and the steel anchor plates respectively; the steel bottom plate is welded at the lower end opening of the rectangular structure formed by the two steel horizontal plates, the steel vertical plates and the steel anchor plates;

[0016] A threaded hole for a connecting piece to pass through is arranged at the center of the steel anchor plate.

[0017] Preferably, the length of the steel anchor plate is greater than that of the steel vertical plate, thereby forming flanges on both sides of the rectangular structure; and more than one anchor bar is symmetrically welded on the flanges on both sides of the steel anchor plate.

[0018] Preferably, the anchor bar has a horizontal portion and an outwardly opening inclined portion, wherein the horizontal portion is welded to the inner surface of the flange of the steel anchor plate, and the inclined portion is opened outwardly.

[0019] Preferably, the inclined portion of the anchor bar opens outwards by 45°.

[0020] (1) The connection node of the precast concrete horizontal floor slab of the utility model is used for the horizontal joint position of the roof floor slab in the precast concrete box-type house, which can realize the rapid connection of two horizontal floor slabs without reinforcement on the side of the precast concrete floor slab. In addition, during the connection process, no concrete pouring process is required, the construction is convenient, and the requirements of efficient on-site construction can be met. The floor slab connection scheme is simple to operate, convenient and efficient, and has the advantage of a short installation period.

[0021] (2) In the present invention, the fastening pads provided in the connectors can play a role in transmitting and diffusing the fastening pressure; the supporting pads provided can play a role in supporting the gap width, thereby avoiding unnecessary internal stress caused by excessive relative displacement of the floor slabs on both sides.

[0022] (3) In the present invention, a retaining nut is provided in the connector, which can prevent the fastening nut from loosening under repeated loads, thereby improving the connection reliability of the connector.

[0023] (4) In the present invention, the anchor bars provided on the steel anchor box can enhance the anchoring capacity of the steel anchor box, thereby improving the connection reliability of the connection node. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A top view of two prefabricated concrete horizontal floor slabs connected by the connection node of the utility model;

[0025] Figure 2 A cross-sectional view (a cross-sectional view along the thickness of the floor slab) of two prefabricated concrete horizontal floor slabs connected by the connection node of the utility model;

[0026] Figure 3 This is the top view of the steel anchor box embedded parts;

[0027] Figure 4 This is the side view of the embedded steel anchor box;

[0028] Figure 5 is a structural schematic diagram of a connecting piece;

[0029] Figure 6 This is a schematic diagram of the embedded sleeve embedded parts.

[0030] Among them: 1-steel anchor box; 2-connector; 3-embedded sleeve; 4-left floor slab; 5-right floor slab;

[0031] 11-steel vertical plate; 12-steel horizontal plate; 13-steel bottom plate; 14-steel anchor plate; 15-anchor bar; 21-connecting screw; 22-fastening pad; 23-fastening nut; 24-stop nut; 25-support pad; 31-threaded tube; 32-shear steel bar. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] The present embodiment provides a horizontal connection node for a precast concrete floor slab, which is used for the horizontal joint position of the roof slab in a precast concrete box-type house. It can realize the rapid connection of two horizontal slabs without reinforcement on the side of the precast concrete floor slab, and is easy to construct, meeting the requirements of efficient on-site construction.

[0034] For the convenience of description, the two precast concrete horizontal floor slabs to be connected are slab A and slab B; slab A and slab B are horizontally butted, and a number of such connection nodes are evenly spaced along the length direction of the horizontal butt joint. In this example, slab A is the left slab 4, and slab B is the right slab 5.

[0035] like Figure 1 and Figure 2 As shown, the connection node includes: a steel anchor box 1, a connecting piece 2 and an embedded sleeve 3; wherein the steel anchor box 1 is embedded in the left floor 4, and the embedded sleeve 3 is embedded in the right floor 5, and the connecting piece 2 is respectively connected to the steel anchor box 1 and the embedded sleeve 3 during on-site assembly, thereby realizing a quick connection between the left floor 4 and the right floor 5.

[0036] like Figure 3 and Figure 4 As shown, the steel anchor box 1 is embedded in the left floor slab 4 on one side close to the horizontal joint, and the right end face of the steel anchor box 1 is flush with the right end face of the left floor slab 4. The steel anchor box 1 is a hollow cubic structure with one side open, which is welded by a steel vertical plate 11, a steel horizontal plate 12, a steel bottom plate 13 and a steel anchor plate 14; the steel vertical plate 11, the steel horizontal plate 12, the steel bottom plate 13 and the steel anchor plate 14 are all rectangular steel plates; the steel vertical plate 11 and the steel anchor plate 14 are arranged opposite to each other, and are parallel to the length direction of the horizontal joint; the two steel horizontal plates 12 are located between the steel vertical plate 11 and the steel anchor plate 14, and are arranged at intervals along the length direction of the horizontal joint, and the two ends are respectively connected to the steel vertical plate 11 and the steel anchor plate 14. The steel anchor plate 14 is welded; the steel bottom plate 13 is welded at the lower opening of the rectangular structure formed by the two steel horizontal plates 12, the steel vertical plate 11 and the steel anchor plate 14; the upper opening of the steel anchor box 1 is flush with the upper surface of the left floor slab 4, and a hole is opened at the upper surface of the left floor slab 4 corresponding to the upper opening of the steel anchor box 1 (it can also be understood that a groove is set at the position on the upper surface of the left floor slab 4 for installing the connection node to install the steel anchor box 1, and the steel bottom plate 13 of the steel anchor box 1 is located on the inner bottom surface of the groove).

[0037] A threaded hole for the connecting member 3 to pass through is provided at the center of the steel anchor plate 14 .

[0038] For the convenience of description, the dimensions of the steel vertical plate 11, the steel horizontal plate 12, the steel bottom plate 13 and the steel anchor plate 14 along the thickness direction of the left floor 4 are their widths, and the dimensions along the length direction of the horizontal joints are their lengths. As an example, the widths of the steel vertical plate 11, the steel horizontal plate 12, the steel bottom plate 13 and the steel anchor plate 14 are the same as the thickness of the left floor 4. The thickness of the steel anchor plate 14 is relatively large (i.e., greater than the thickness of the steel vertical plate 11, the steel horizontal plate 12 and the steel bottom plate 13); the length of the steel anchor plate 14 is greater than the length of the steel vertical plate 11, thereby forming flanges on both sides of the rectangular structure; the anchor bars 15 are symmetrically welded on the flanges on both sides of the steel anchor plate 14; the anchor bars 15 have a horizontal portion and an outwardly flared inclined portion, the horizontal portion of which is welded to the inner surface of the flange of the steel anchor plate 14, and the inclined portion is flared outward by 45° (i.e., the angle between the inclined portion and the steel anchor plate 14 is 45°).

[0039] On each side flange of the steel anchor plate 14, a plurality of anchor bars 15 may be arranged at intervals along the thickness direction of the left floor slab 4, such as Figure 4 As shown, in this example, two anchor bars 15 can be arranged at intervals along the thickness direction of the left floor slab 4 on each side flange of the steel anchor plate 14. The anchor bars 15 are made of HRB400 grade steel bars, and the length meets the set anchoring requirements.

[0040] like Figure 6 As shown, the embedded sleeve 3 includes a threaded tube 31 and a shear steel bar 32, and the embedded sleeve 3 is embedded in the right floor 5 near the horizontal joint side; the threaded tube 31 is arranged in the plane where the horizontal joint is located, perpendicular to the length direction of the horizontal joint, and the left end of the threaded tube 31 is processed with a central blind hole with internal threads (i.e., an internal threaded hole); the diameter and depth of the internal threaded hole meet the connection requirements with the connector 2; a through hole is provided radially on the circumferential surface of the threaded tube 31 away from the horizontal joint of the floor (i.e., the right end), which is used to penetrate the shear steel bar 32; the axial direction of the shear steel bar 32 is parallel to the length direction of the horizontal joint; the shear steel bar 32 is a high-strength steel bar with a set length, preferably HRB400 grade steel bar, and the length of the two ends of the shear steel bar 32 extending out of the threaded tube 31 is the same. As an example, multiple shear steel bars 32 can also be arranged at intervals along the axial direction of the threaded tube 31.

[0041] The connecting piece 2 is used to connect the left floor slab 4 and the right floor slab 5 on site by cooperating with the steel anchor box 1 and the embedded sleeve 3; Figure 5As shown, the connecting member 2 includes: a connecting screw 21, a supporting pad 25, a fastening pad 22, a fastening nut 23 and a stop nut 24; wherein the connecting screw 21 is a full-length outer sleeve steel screw, and its length and outer diameter meet the connection requirements with the steel anchor box 1 and the embedded sleeve 3; the supporting pad 25 is located in the horizontal joint between the left floor 4 and the right floor 5, and plays the role of supporting the gap width. Its thickness is slightly smaller than the gap width, and the supporting pad 25 is a circular steel plate.

[0042] When the connecting piece 2 is used to connect the left floor slab 4 and the right floor slab 5, the right end of the connecting screw 21 extends into the threaded tube 31 and is threadedly connected with the threaded tube 31; the left end of the connecting screw 21 passes through the central threaded hole of the steel anchor plate 14 and extends into the interior of the steel anchor box 1; the part of the connecting screw 21 extending into the interior of the steel anchor box 1 is successively covered with a fastening pad 22 and a fastening nut 23, and the fastening pad 22 also forms an annular steel plate. The fastening nut 23 is tightened, and the fastening nut 23 presses the steel anchor plate 14 through the fastening pad 22; thereby, the connecting screw 21 is tensioned by the fastening nut 23, so that the two sides of the floor are connected as a whole; the fastening pad 22 is set to play the role of transmitting and diffusing the fastening pressure; the outer side of the fastening nut 23 on the connecting screw 21 is threadedly connected to the stop nut 24, which can prevent the fastening nut 23 from loosening under repeated load action; the connection operation of the above-mentioned connecting piece 2 is all performed at the upper end opening of the steel anchor box 1, which is simple, convenient and efficient.

[0043] In actual application, the installation process is as follows:

[0044] The left floor slab 4 and the right floor slab 5 are both precast concrete floor slabs. According to the requirements of this scheme, a steel anchor box 1 and a pre-embedded sleeve 3 are respectively embedded on both sides of the joint;

[0045] (1) According to the lifting task arrangement, the prefabricated components / prefabricated concrete box-type house modules with the left floor 4 and the right floor 5 are lifted into place respectively, and the gap between the left floor 4 and the right floor 5 is adjusted to the set requirements;

[0046] (2) Place a support pad 25 at the connection node in the joint between the left floor 4 and the right floor 5, align the circular hole of the support pad 25 with the bolt hole in the center of the steel anchor plate 14, and temporarily fix it;

[0047] (3) Using the upper opening of the steel anchor box, install the connecting screw 21, pass the connecting screw 21 through the bolt hole of the steel anchor plate 14, and screw it into the threaded sleeve 31 to set the depth;

[0048] (4) A fastening plate 22 and a fastening nut 23 are respectively mounted on the left side of the connecting screw 21;

[0049] (5) Tighten the fastening nut 23 to squeeze the left floor 4 and the right floor 5 into place;

[0050] (6) Install the stop nut 24 on the connecting screw 21 and screw it in until it is close to the fastening nut 23;

[0051] (7) Mix mortar to seal the cavity of anchor box 1, and the node connection is completed.

[0052] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A horizontal connection node of a precast concrete floor, characterized in that: include: Steel anchor boxes, connectors and embedded sleeves; The two precast concrete horizontal floor slabs to be connected are floor slab A and floor slab B; the floor slab A and floor slab B are horizontally butted together to form a horizontal joint; The embedded sleeve is embedded in the floor slab B, and an internal threaded hole is provided at one end of the embedded sleeve facing the horizontal joint; The steel anchor box is pre-buried in the floor A, and the upper end of the steel anchor box is open; the upper end opening of the steel anchor box is flush with the upper surface of the floor A, and a hole is opened at a position corresponding to the upper end opening of the steel anchor box on the upper surface of the floor A; The connecting piece comprises: a connecting screw, a supporting pad, a fastening pad and a fastening nut; The supporting pad is located between the horizontal joints of floor slabs A and B; one end of the connecting screw passes through the supporting pad and extends into the internal threaded hole in the embedded sleeve, and is threadedly connected to the embedded sleeve; the other end extends into the steel anchor box, and the part of the connecting screw extending into the interior of the steel anchor box is sequentially covered with a fastening pad and a fastening nut, and the fastening nut presses the steel anchor box through the fastening pad.

2. The horizontal connection node of the precast concrete floor slab according to claim 1, characterized in that: The connecting piece also includes a stop nut threadedly connected to the outer side of the fastening nut on the connecting screw.

3. The horizontal connection node of the precast concrete floor slab according to claim 1 or 2, characterized in that: The embedded sleeve comprises: a threaded tube and shear-resistant steel bars; The threaded tube is arranged in the plane where the horizontal joint is located, in a direction perpendicular to the length of the horizontal joint; a central blind hole with an internal thread is arranged at one end of the threaded tube facing the horizontal joint; a through hole is radially arranged on the circumferential surface of the other end of the threaded tube for penetrating the shear steel bars; the axial direction of the shear steel bars is parallel to the length direction of the horizontal joint.

4. The horizontal connection node of the precast concrete floor slab according to claim 3, characterized in that: A plurality of shear-resistant steel bars are arranged at intervals along the axial direction of the threaded tube.

5. The horizontal connection node of the precast concrete floor slab according to claim 1 or 2, characterized in that: The steel anchor box is a hollow cubic structure with an open top formed by welding a steel vertical plate, a steel horizontal plate, a steel bottom plate and a steel anchor plate; The steel vertical plates, steel horizontal plates, steel bottom plates and steel anchor plates are all rectangular steel plates; the steel vertical plates and steel anchor plates are arranged opposite to each other and are parallel to the length direction of the horizontal joint; The two steel horizontal plates are located between the steel vertical plates and the steel anchor plates, and are spaced apart along the length direction of the horizontal joint, and the two ends are welded to the steel vertical plates and the steel anchor plates respectively; the steel bottom plate is welded to the lower end opening of the rectangular structure formed by the two steel horizontal plates, the steel vertical plates and the steel anchor plates; A threaded hole for a connecting piece to pass through is arranged at the center of the steel anchor plate.

6. The horizontal connection node of the precast concrete floor slab according to claim 5, characterized in that: The length of the steel anchor plate is greater than that of the steel vertical plate, thereby forming flanges on both sides of the rectangular structure; and more than one anchor bar is symmetrically welded on the flanges on both sides of the steel anchor plate.

7. The horizontal connection node of the precast concrete floor slab according to claim 6, characterized in that: The anchor bar has a horizontal portion and an outwardly opening inclined portion, wherein the horizontal portion is welded to the inner surface of the flange of the steel anchor plate, and the inclined portion is opened outwardly.

8. The horizontal connection node of the precast concrete floor slab according to claim 7, characterized in that: The inclined portion of the anchor bar is opened outward by 45°.

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