Assembly type foundation pit beam section splicing joint structure of square beam end and installation method of assembly type foundation pit beam section splicing joint structure

Abstract

The invention discloses an assembly type foundation pit beam section splicing joint structure with square beam ends and an installation method, the assembly type foundation pit beam section splicing joint structure comprises two beam sections with the square beam ends, joint bar holes or insert key holes are formed in the end head faces of the beam sections, and the two beam sections are spliced into a whole with a splicing seam in the mode that joint bars are inserted into the joint bar holes or connecting keys are inserted into the insert key holes; a seam-crossing buckling frame is arranged on the periphery of the periphery of the splicing seam, the seam-crossing buckling frame is of a square frame structure formed by sleeving a small frame with a large frame, the large frame comprises a transverse screw rod, a transverse nut and a longitudinal clamping plate which are assembled together, and the small frame comprises a longitudinal screw rod, a longitudinal nut, a clamping plate, a connecting rod and a set screw which are assembled together; the number of the clamping plates is four, and the inner corners of the clamping plates are tightly buckled with the four corners of the beam ends on the two sides of the splicing seam respectively. Damage to the beam section caused by punching can be reduced, the service life can be prolonged, splicing is convenient, and dismounting and recycling are convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of prefabricated building, in particular to a prefabricated foundation pit beam segment splicing joint structure of square beam end and a mounting method. BACKGROUND

[0002] In order to solve the problem of urgent construction period, large stress and high deformation control requirement of foundation pit support, a prefabricated reinforced concrete-steel structure mixed support system (such as invention CN119640814A) for quick installation and removal is developed. This structure has the advantages of large bearing capacity of reinforced concrete support, low cost and lightness of steel support, and can be recycled multiple times, with significant full-life benefits. Although this system has many advantages, it also has some disadvantages: the connection between the reinforced concrete beam segments (referred to as "beam segments") and the connection between the beam segments and the steel structure rely on the preformed holes at the beam end, and are realized through connecting steel plates and screws. This kind of joint connection method needs to set more holes at the beam end, which greatly damages the beam segments and seriously affects the bearing capacity and service life of the beam segments; and when the beam segments are connected, more screws and nuts are needed, which is time-consuming and laborious to operate. Therefore, a new type of joint structure needs to be developed. SUMMARY

[0003] The purpose of the present application is to overcome the above-mentioned shortcomings, provide a prefabricated foundation pit beam segment splicing joint structure of square beam end and a mounting method, to reduce the damage of opening holes to the beam segments, prolong the service life, and facilitate convenient assembly, disassembly and recycling.

[0004] To solve the above technical problems, the technical solution adopted by the present application is: a prefabricated foundation pit beam segment splicing joint structure of square beam end, comprising two beam segments with square beam ends, the end face of the beam segment is provided with a reinforcing bar hole or a key hole, and the two beam segments are spliced to form an integral body with a splicing joint by inserting a reinforcing bar into the reinforcing bar hole or by inserting a connecting key into the key hole; a cross-joint bracket is provided around the splicing joint, the cross-joint bracket is a square frame structure with a large frame surrounding a small frame, the large frame comprises transverse screws, transverse nuts and longitudinal clamping plates assembled together, and the small frame comprises longitudinal screws, longitudinal nuts, clamping plates, connecting rods and locking screws assembled together; the clamping plates are four, and the inner corners thereof are tightly coupled with the four corners of the beam ends on both sides of the splicing joint.

[0005] Preferably, the reinforcing bar hole or the key hole is vertically arranged on the end face of the square beam end of the beam segment; the key hole is arranged at the center of the end face of the beam segment, and the cross section of the key hole is a square, and the cross section of the corresponding connecting key is also a square.

[0006] Preferably, the cross section of the clamping plate is L-shaped, and the two ends of the clamping plate are provided with protruding baffle plates, one flange end face of the clamping plate is provided with a plurality of connecting rod holes, each connecting rod hole is correspondingly arranged with a vertical locking screw hole, the locking screw hole is open on the flange side, and the flange side is further provided with two longitudinal screw holes.

[0007] Preferably, the inner angle of the L-shaped cross section of the clamping plate is 90°, and the inner angles of the four clamping plates are respectively tightly buckled with the four corner edges of the beam ends on both sides of the splicing joint, wherein the longitudinal screw holes of the two clamping plates on the same side are correspondingly inserted with longitudinal screws, and the two ends of the longitudinal screws are screwed with longitudinal nuts.

[0008] Preferably, the connecting rod holes of the two clamping plates on the same horizontal level are correspondingly inserted with connecting rods, and the locking screw holes are all provided with locking screws.

[0009] Preferably, the two ends of the two clamping plates on the same side are respectively provided with a longitudinal clamping plate, and there are four longitudinal clamping plates in total; the two ends of the longitudinal clamping plate are provided with through longitudinal screw holes, the longitudinal screw holes on the same horizontal level of the two longitudinal clamping plates on the same end of the clamping plate are correspondingly inserted with longitudinal screws, and the two ends of the longitudinal screws are screwed with longitudinal nuts.

[0010] Preferably, the cross joint fastener and the surface around the beam ends on both sides of the splicing joint are wrapped with a plurality of layers of carbon fiber cloth.

[0011] Preferably, the clamping plate is further provided with an end plate between the clamping plate and the side surface of the beam end on both sides of the splicing joint, and the end plate is located between the baffle plates at the two ends of the clamping plate.

[0012] Preferably, the end plate is welded with a bone piece; and the beam segment is a rectangular reinforced concrete beam segment or a steel pipe concrete with a square end section and a circular middle section.

[0013] In addition, the mounting method of the assembled foundation pit beam segment splicing joint structure of the square beam end is also disclosed, and the mounting method comprises the following steps: S1: after inserting the dowel bar into the dowel bar hole on the end face of a beam segment, the exposed dowel bar is inserted into the dowel bar hole on the end face of another beam segment, and the end faces of the two beam segments are tightly attached; or after inserting the connecting key into the key hole on the end face of a beam segment, the exposed connecting key is inserted into the key hole on the end face of another beam segment, and the end faces of the two beam segments are tightly attached, thereby realizing the preliminary splicing between the beam segments, forming a splicing joint, and then wrapping the splicing position with carbon fiber cloth at the splicing joint; S2: two clamping plates are taken, the connecting rods are inserted into the connecting rod holes, and the inner angles of the clamping plates are buckled on the two corner edges on the upper surface of the beam segment; the other two clamping plates are taken, the connecting rods are also inserted into the connecting rod holes, and the inner angles of the clamping plates are buckled on the two corner edges on the lower surface of the beam segment; S3: Take four longitudinal screws through the four corresponding sets of longitudinal screw holes in the four clamping plates, and screw on the longitudinal nuts. At this time, do not tighten the longitudinal nuts, leaving enough longitudinal space for subsequent placement of the end plate; S4: Place four longitudinal clamping plates outside the two ends of the clamping plate, and pass four transverse screws through the four sets of transverse screw holes on the four longitudinal clamping plates. Screw on the transverse nuts at this time. Again, do not tighten the transverse nuts, leaving enough transverse space for subsequent placement of the end plate; S5: Place the end plate between the carbon fiber cloth and the clamping plate, and between the two end plates of the clamping plate; S6: Tighten the transverse nuts and longitudinal nuts in turn, so that the four clamping plates tightly grip the four corners of the beam section, and the end plate cannot be moved or removed. Finally, screw the locking screws into the locking screw holes on the upper and lower surfaces of the clamping plate to fix the connecting rod; S7: Weld the bone piece to the two side surfaces of the end plate to complete the installation.

[0014] The present application has the following advantages: 1. The node structure provided by the present application has only one hole for docking at the end of the reinforced concrete beam section, which reduces the damage to the beam section caused by the hole at the end of the beam, and also prolongs the service life.

[0015] 2. All components of the present application can be removed and recycled for reuse, which significantly improves the full life benefit and greatly reduces carbon emissions during material production.

[0016] 3. The node structure provided by the present application has a simple component structure, which is easy to manufacture and easy to apply in engineering.

[0017] 4. The node installation method provided by the present application only needs to use a tower crane or crane on the construction site and a small amount of wrench, welding gun and other tools to complete the installation. The required installation technology is simple and easy to operate.

[0018] 5. The beam section splicing method provided by the present application is simple to operate when not connected with the steel structure auxiliary support, only needs to insert the reinforcing bar or connecting key and wrap the carbon fiber cloth, which is more simplified than the existing patent technology (such as CN119640814A). BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Structure diagram of the reinforcing bar hole provided for the end face of the beam section; Figure 2 Structure diagram of the key hole provided for the end face of the beam section; Figure 3 Figure 1 Structure diagram of the splicing node of the two beam sections shown; Figure 4 Figure 2 ​​Schematic diagram of the structure in which multiple layers of carbon fiber cloth are wrapped around the joint of two beam segments; Figure 5 Schematic diagram of the structure of the card plate; Figure 6 It is a structural diagram of the longitudinal splint; Figure 7 It is a structural diagram of the small frame; Figure 8 This is a schematic diagram of the structure after the large frame is placed outside the small frame; Figure 9 This is a structural diagram of a prefabricated foundation pit beam segment splicing node structure with square beam ends after installation; Figure 10 This is a structural diagram of another type of assembled foundation pit beam segment splicing node structure with square beam ends after installation; Figure 11 This is a structural diagram of a bone component welded to an end plate; Figure 12 This is a schematic diagram of the structure of another type of bone welded to the end plate.

[0020] In the figure: 1-beam section, 101-rebar insertion hole, 102-key insertion hole, 2-carbon fiber cloth, 3-rebar insertion; 4-connecting key, 5-positioning plate, 501-longitudinal screw hole, 502-connecting rod hole, 503-fastening screw hole, 504-baffle, 6-longitudinal splint, 601-transverse screw hole, 7-longitudinal screw, 8-longitudinal nut, 9-transverse screw, 10-transverse nut, 11-fastening screw, 12-connecting rod, 13-end plate, 14-bone. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0022] Example 1: Figures 1-12 As shown, an assembled foundation pit beam segment splicing node structure with square beam ends includes two beam segments 1 with square beam ends, the end surfaces of the beam segments 1 are provided with dowel holes 101 or key holes 102, and the two beam segments 1 are spliced ​​together to form a whole with a splicing seam by inserting dowels 3 into the dowel holes 101 or by inserting connecting keys 4 into the key holes 102; a cross-seam buckle frame is provided around the splicing seam, and the cross-seam buckle frame is a square frame structure with a large frame inside a small frame, the large frame includes assembled transverse screws 9, transverse nuts 10 and longitudinal splints 6, and the small frame includes assembled longitudinal screws 7, longitudinal nuts 8, positioning plates 5, connecting rods 12 and set screws 11; the positioning plates 5 are four pieces, and their inner corners are respectively tightly fastened to the four corners of the beam ends on both sides of the splicing seam.

[0023] Preferably, the insertion hole 101 or the key hole 102 is vertically arranged on the square beam end face of the beam segment 1; the key hole 102 is arranged at the center of the end face of the beam segment 1, and the cross section of the key hole 102 is a square, and the cross section of the corresponding connecting key 4 is also a square.

[0024] Preferably, the cross section of the clamping plate 5 is L-shaped, and the two ends are provided with protruding baffle plates 504, and one flange end face is provided with a plurality of connecting rod holes 502, each connecting rod hole 502 is correspondingly arranged with a vertical tight screw hole 503, the tight screw hole 503 is opened on the flange side, and the flange side is also provided with two longitudinal screw holes 501.

[0025] Preferably, the inner angle of the L-shaped section of the clamping plate 5 is 90°, and the inner angles of the four clamping plates 5 are tightly buckled with the four corner angles of the beam ends on both sides of the splicing joint, wherein the longitudinal screw holes 501 of the two clamping plates 5 on the same side are correspondingly inserted with longitudinal screws 7, and the two ends of the longitudinal screws 7 are screwed with longitudinal nuts 8.

[0026] Preferably, the connecting rod holes 502 of the two clamping plates 5 on the same horizontal level are correspondingly inserted with connecting rods 12, and the tight screws 11 are arranged in all the tight screw holes 503.

[0027] Preferably, the two ends of the two clamping plates 5 on the same side are each provided with a longitudinal clamping plate 6, and there are four longitudinal clamping plates 6; the two ends of the longitudinal clamping plate 6 are provided with through longitudinal screw holes 601, the longitudinal screw holes 601 on the same horizontal level of the two longitudinal clamping plates 6 located at the same end of the clamping plate 5 are correspondingly inserted with a horizontal screw 9, and the two ends of the horizontal screw 9 are screwed with a horizontal nut 10.

[0028] Preferably, as shown in Figure 3 and 4 , a plurality of layers of carbon fiber cloth 2 are wound between the cross-joint clamping frame and the surrounding surface of the beam end on both sides of the splicing joint.

[0029] Preferably, the clamping plate 5 is further provided with an end plate 13 between the beam end side surface on both sides of the splicing joint, and the end plate 13 is located between the baffle plates 504 at the two ends of the clamping plate 5.

[0030] Preferably, the end plate 13 is welded with a bone piece 14; the beam segment 1 is a rectangular reinforced concrete beam segment or a steel pipe concrete with a square cross section and a circular middle section.

[0031] Embodiment 2: The embodiment discloses a mounting method of the assembly type foundation pit beam segment splicing joint structure of the square beam end, and comprises the following steps: S1: as shown in Figure 3 , Figure 4As shown, after inserting the dowel 3 into the dowel hole 101 of the end face of one beam segment 1, the exposed dowel 3 is inserted into the dowel hole 101 of the end face of another beam segment 1, and the end faces of the two beam segments are tightly attached; or after inserting the connecting key 4 into the key hole 102 of the end face of one beam segment 1, the exposed connecting key 4 is inserted into the key hole 102 of the end face of another beam segment 1, and the end faces of the two beam segments are tightly attached, to realize the preliminary splicing between the beam segments, form a splicing joint, and then wrap the splicing part with the carbon fiber cloth 2 at the splicing joint; S2: as shown in Figure 7 , take two clamping plates 5, insert the connecting rod 12 into the connecting rod hole 502, and buckle the inner corner of the clamping plate 5 across the joint on the upper surface of the beam segment 1 two edge corners; take out another two clamping plates 5, also insert the connecting rod 12 into the connecting rod hole 502, and buckle the inner corner of the clamping plate 5 across the joint on the lower surface of the beam segment 1 two edge corners; S3: take four longitudinal screws 7 through the four groups of longitudinal screw holes 501 corresponding to the four clamping plates 5, and screw on the longitudinal nuts 8, but do not tighten the longitudinal nuts 8 at this time, leaving enough longitudinal space for subsequent placement of the end plate 13; S4: as shown in Figure 8 , take four longitudinal clamping plates 6 and place them outside the two ends of the clamping plate 5, pass the four groups of transverse screw holes 601 on the four longitudinal clamping plates 6 through the four transverse screws 9, and screw on the transverse nuts 10, but do not tighten the transverse nuts 10 at this time, leaving enough transverse space for subsequent placement of the end plate 13; S5: place the end plate 13 between the carbon fiber cloth 2 and the clamping plate 5, and make it between the baffles 504 at both ends of the clamping plate 5; S6: tighten the transverse nuts 10 and longitudinal nuts 8 in turn, make the four clamping plates 5 tightly buckle the four edge corners of the beam segment, and make the end plate 13 immovable and removable; finally, screw the set screws 11 into the set screw holes 503 on the upper and lower surfaces of the clamping plate 5, and fix the connecting rod 12; S7: weld the bone piece 14 on both sides of the end plate 13, and complete the installation. The finished product is as shown in Figure 9 , Figure 10 ; the welded structure is as shown in Figure 11 , Figure 12 .

[0032] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as limitations of the present application. The protection scope of the present application should be based on the technical solutions claimed in the claims, including equivalent replacement solutions of the technical features claimed in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present application.

Claims

1. A square beam end assembled foundation pit beam segment splicing node structure, comprising two beam segments (1) with square beam ends, characterized in that: The end surface of the beam section (1) is provided with a dowel hole (101) or a key hole (102), and the two beam sections (1) are spliced ​​together to form a whole with a splicing seam by inserting a dowel (3) into the dowel hole (101) or by inserting a connecting key (4) into the key hole (102); a cross-seam buckle frame is provided around the periphery of the splicing seam, and the cross-seam buckle frame is a square frame structure with a large frame inside a small frame, the large frame includes a transverse screw (9), a transverse nut (10) and a longitudinal clamping plate (6) assembled together, and the small frame includes a longitudinal screw (7), a longitudinal nut (8), a positioning plate (5), a connecting rod (12) and a set screw (11) assembled together; the positioning plate (5) is four pieces, and the inner corners of the positioning plates are respectively fastened to the four corners of the beam end on both sides of the splicing seam.

2. The assembled foundation pit beam segment splicing node structure of the square beam end according to claim 1 is characterized in that: The reinforcing bar hole (101) or the key hole (102) is vertically arranged on the square beam end face of the beam section (1); the key hole (102) is arranged at the center of the end face of the beam section (1), and the cross section of the key hole (102) is square, and the cross section of the corresponding connecting key (4) is also square.

3. The assembled foundation pit beam segment splicing node structure at the square beam end according to claim 1 is characterized in that: The cross section of the positioning plate (5) is L-shaped, and a raised baffle (504) is provided at both ends thereof. A plurality of connecting rod holes (502) are provided on the end face of one flange, and each connecting rod hole (502) is correspondingly provided with a fastening screw hole (503) perpendicular thereto. The fastening screw hole (503) opens on the side face of the flange, and two longitudinal screw holes (501) are also provided on the side face of the flange.

4. The assembled foundation pit beam segment splicing node structure at the square beam end according to claim 3 is characterized in that: The inner angle of the L-shaped cross section of the positioning plate (5) is 90°, and the inner angles of the four positioning plates (5) are respectively tightly connected with the four corners of the beam ends on both sides of the splicing seam, wherein the longitudinal screw holes (501) of the two positioning plates (5) on the same side correspond to each other and are inserted with longitudinal screws (7), and longitudinal nuts (8) are screwed on both ends of the longitudinal screws (7).

5. The assembled foundation pit beam segment splicing node structure at the square beam end according to claim 4 is characterized in that: The connecting rod holes (502) of the two positioning plates (5) at the same level correspond to each other and are inserted with connecting rods (12), and all the fastening screw holes (503) have fastening screws (11).

6. The assembled foundation pit beam segment splicing node structure at the square beam end according to claim 5 is characterized in that: A longitudinal splint (6) is provided on the outer surface of each end of the two positioning plates (5) on the same side, and there are four longitudinal splints (6); transverse screw holes (601) are provided at both ends of the longitudinal splints (6), and the transverse screw holes (601) at the same level of the two longitudinal splints (6) at the same end of the positioning plate (5) correspond to and are inserted with transverse screws (9), and transverse nuts (10) are screwed on both ends of the transverse screws (9).

7. The assembled foundation pit beam segment splicing node structure at the square beam end according to claim 1 is characterized in that: Several layers of carbon fiber cloth (2) are wound between the cross-seam buckle frame and the surrounding surfaces of the beam ends on both sides of the splicing seam.

8. The assembled foundation pit beam segment splicing node structure at the square beam end according to claim 3 is characterized in that: An end plate (13) is further provided between the positioning plate (5) and the side surfaces of the beam ends on both sides of the joint, and the end plate (13) is located between the baffles (504) at both ends of the positioning plate (5).

9. The assembled foundation pit beam segment splicing node structure at the square beam end according to claim 8 is characterized in that: A frame (14) is welded to the end plate (13); the beam section (1) is a rectangular reinforced concrete beam section or a steel tube concrete beam section with a square end section and a circular middle section.

10. A method for installing the assembled foundation pit beam segment splicing node structure of the square beam end according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: After inserting the dowel (3) into the dowel hole (101) at the end face of one beam segment (1), the exposed dowel (3) is inserted into the dowel hole (101) at the end face of another beam segment (1) and the end faces of the two beam segments are closely attached; or after inserting the connecting key (4) into the key hole (102) at the end face of one beam segment (1), the exposed connecting key (4) is inserted into the key hole (102) at the end face of another beam segment (1) and the end faces of the two beam segments are closely attached, thereby achieving preliminary splicing between the beam segments and forming a splicing seam, and then wrapping the splicing part with carbon fiber cloth (2) at the splicing seam; S2: Take two positioning plates (5), insert the connecting rod (12) into the connecting rod hole (502), and make the inner corner span of the positioning plate (5) buckle on the two corners of the upper surface of the beam section (1); take out the other two positioning plates (5), insert the connecting rod (12) into the connecting rod hole (502), and make the inner corner span of the positioning plate (5) buckle on the two corners of the lower surface of the beam section (1); S3: Take four longitudinal screws (7) and pass them through the four groups of longitudinal screw holes (501) corresponding to the four positioning plates (5), and screw on the longitudinal nuts (8). At this time, do not tighten the longitudinal nuts (8) to leave enough longitudinal space for the subsequent placement of the end plate (13); S4: Take four longitudinal splints (6) and place them outside the two ends of the card plate (5), pass the four transverse screws (9) through the four sets of transverse screw holes (601) on the four longitudinal splints (6) in the same line, and screw on the transverse nuts (10). At this time, do not tighten the transverse nuts (10) to leave enough transverse space for the subsequent placement of the end plate (13); S5: placing the end plate (13) between the carbon fiber cloth (2) and the positioning plate (5), and positioning it between the baffles (504) at both ends of the positioning plate (5); S6: Tighten the transverse nuts (10) and longitudinal nuts (8) step by step in sequence, so that the four positioning plates (5) are tightly attached to the four corners of the beam section, and the end plate (13) cannot be moved or removed; finally, screw the set screws (11) into the set screw holes (503) on the upper and lower surfaces of the positioning plates (5) to fix the connecting rod (12); S7: Weld the bone piece (14) to both sides of the end plate (13) to complete the installation.

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