Concrete building surface crack prevention and treatment structure

Abstract

The utility model relates to a concrete building surface crack prevention structure which comprises a covering sinking groove which is formed in the upper portion of a crack in the development direction of the crack and communicated with the surface of a concrete structure layer, and the crack and the covering sinking groove are filled with repairing materials. A plurality of traction pieces distributed in the crack development direction are arranged in the covering sinking groove at intervals. Each traction part is a telescopic part which is arranged above the crack in a crossing manner; connecting pieces connected with the concrete structure layer are arranged at the two ends of each traction piece respectively; according to the utility model, the arrangement of the traction piece can adapt to different widths of crack development.

Description

Technical Field

[0001] The utility model relates to a concrete building surface crack prevention and treatment structure, belonging to the technical field of crack repairing. Background Art

[0002] There are generally three states of concrete cracks: static cracks, active cracks, and developing cracks. According to the different states of concrete cracks, different concrete crack prevention and treatment methods are generally required.

[0003] For developing cracks or active cracks, when the prevention and control purpose is mainly to restore the tensile strength of the main crack section, it is appropriate to adopt the nailing method. The traditional nailing method generally uses relatively thin and long metal "sewing U-shaped nails" to cross the cracks and embed them into the pre-opened grooves, and fix them with non-shrinkage mortar or epoxy resin-based adhesives.

[0004] A Chinese patent with announcement number CN218406682U discloses a concrete crack repair structure with good reinforcement effect, including a resin layer filled in the crack groove, a rectangular groove opened on the surface of the concrete layer, a T-shaped groove opened at the bottom end of the inner cavity of the rectangular groove, slots opened on both sides of the bottom end of the inner cavity of the T-shaped groove, and a first steel bar and a second steel bar are installed in the T-shaped groove and the slot respectively. The first steel bar and the second steel bar are placed respectively, and then the two are welded, and then the crack is limited by grouting in batches to complete the crack repair. However, the width of the crack varies during the development of the crack. If the spacing between the traction limiting components is fixed, limitations will appear during use, resulting in a decrease in the effect of traction limiting. Utility Model Content

[0005] In order to overcome the above problems, the utility model provides a concrete building surface crack prevention structure, and the setting of the traction piece can adapt to the different widths of crack development.

[0006] The technical solution of the utility model is as follows:

[0007] A structure for preventing and controlling cracks on the surface of a concrete building comprises a covering trough which is arranged on the upper part of the crack along the direction of development of the crack and is connected to the surface of a concrete structural layer, wherein the crack and the covering trough are filled with repair materials; a plurality of traction members which are distributed along the direction of development of the crack are arranged at intervals in the covering trough; each of the traction members is a retractable member which is arranged across the crack; and each of the two ends of the traction member is provided with connecting members which are connected to the concrete structural layer.

[0008] Furthermore, the traction member includes two cross bars arranged opposite to each other, and a fastening screw placed between the two cross bars for connecting the two cross bars; both end surfaces of the fastening screw are concavely provided with threaded holes; the two cross bars are placed on both sides of the crack, and the outer circumferences of the opposite ends of the two cross bars are provided with external threads matching the internal threads of the threaded holes, and the free ends of the two cross bars are fixedly connected to the adjacent connecting members.

[0009] Furthermore, the connecting member is a fixing rod formed by outwardly protruding free ends of the crossbars, and the fixing rod extends into the concrete structure layer and is fixedly connected thereto via expansion members.

[0010] Furthermore, a mounting hole for accommodating the fixing rod is provided in the concrete structure layer; a tubular expansion member is sleeved on the outer periphery of the fixing rod, and a plurality of expansion joints extending to the bottom of the expansion member are provided axially around the lower part of the expansion member, and the lower part of the inner hole of the expansion member shrinks toward the center to form a conical hole with a larger upper part and a smaller lower part; the expansion joint is communicated with the conical hole.

[0011] Furthermore, a plurality of stop grooves which are larger at the top and smaller at the bottom are arranged on the upper part of the inner hole along its length direction; and a plurality of stop teeth which match the stop grooves are formed on the outer periphery of the fixing rod protruding outward along its length direction.

[0012] Furthermore, the anti-recession tooth and the anti-recession groove are configured to be inverted truncated cone shapes.

[0013] Furthermore, the free end of the fixing rod is a pointed end.

[0014] Furthermore, the outer periphery of the tightening screw is fixedly connected to the rotating protrusion.

[0015] The utility model has the following beneficial effects:

[0016] 1. The utility model arranges a traction member along the crack development direction in the concrete structure layer, and inserts the fixing rods arranged at both ends of the traction member into the expansion member to expand it, so that the connection between the traction member and the concrete structure layer is firm, and the fixing rod is stopped in one direction under the cooperation of the stop teeth and the stop groove to prevent the fixing rod from loosening from the concrete structure layer, and then the traction member is fixed in the covering sink groove to ensure the firmness of the connection between the traction member and the concrete structure layer.

[0017] 2. The utility model places the traction member across the crack and uses a tightening screw to adjust the distance between the two cross bars to adapt to cracks of different widths, thereby improving the adaptability of the traction member and ensuring the traction and limiting effect of the traction member on the crack; at the same time, the traction member is arranged in the covering trough, which can ensure the flatness of the crack repair site and the surface of the concrete structure layer.

[0018] 3. The utility model uses traction parts to limit the concrete structure layers on both sides of the crack, and cooperates with the repair materials poured later, while reducing the shear force borne by the repair materials, so that the crack repair part has better tensile strength and anti-cracking ability, thereby restoring the tensile strength of the crack end face, and then avoiding the phenomenon of secondary cracking of the crack caused by the shear force being borne by the repair materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a top view of the utility model.

[0020] Figure 2 for Figure 1 Sectional view at AA.

[0021] Figure 3 A cross-sectional view of the expansion member.

[0022] Figure 4 A cross-sectional view of the traction member.

[0023] Figure 5 A cross-sectional view of the fastening screw.

[0024] The reference numerals in the figure are as follows:

[0025] 1. Crack; 2. Concrete structure layer; 21. Installation hole; 3. Covering sink; 4. Repair material; 5. Traction piece; 51. Cross bar; 52. Fastening screw; 521. Threaded hole; 53. Rotating protrusion; 6. Connector; 61. Backstop tooth; 7. Expansion piece; 71. Expansion joint; 72. Inner hole; 73. Conical hole; 74. Backstop groove. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figure 1-5 A structure for preventing and controlling cracks 1 on a concrete surface comprises a covering trough 3 which is arranged on the upper part of the crack 1 along the direction in which the crack 1 develops and is connected to the surface of a concrete structure layer 2. A plurality of traction members 5 which are distributed along the direction in which the crack 1 develops are arranged in the covering trough 3, wherein each traction member 5 is a retractable member which is arranged across the crack 1, and both ends of each traction member 5 are respectively provided with connecting members 6 which are fixedly connected to the concrete structure layer 2. After the traction members 5 are arranged, repair materials 4 are filled into the crack 1 and the covering trough 3 in turn until they are flush with the surface of the concrete structure layer 2, so as to avoid the exposure of the traction members 5 on the surface of the concrete structure layer 2 after being arranged, and to keep the outer surface of the concrete structure layer 2 smooth. The repair materials 4 can be materials such as non-shrinkage mortar or epoxy resin-based adhesive.

[0028] Furthermore, the width of the covering groove 3 is greater than the width of the crack 1, and the length of the covering groove 3 is greater than the length of the crack 1, which is convenient for setting the traction member 5 and ensuring the flatness and beauty of the crack 1 and the covering groove 3 after the repair material 4 is filled.

[0029] Furthermore, the traction member 5 includes two cross bars 51 arranged opposite to each other, and a fastening screw 52 placed between the two cross bars 51 for connecting the two cross bars 51; both end surfaces of the fastening screw 52 are concavely provided with threaded holes 521; the two cross bars 51 are placed on both sides of the crack 1, and the outer peripheries of the opposite ends of the two cross bars 51 are provided with external threads matching the internal threads of the threaded holes 521, and the free ends of the two cross bars 51 protrude outward to form fixed rods, which extend into the concrete structure layer 2 and are fixedly connected thereto by expansion members 7; when the fastening screw 52 is rotated, the two cross bars 51 move in a direction of approaching or moving away from each other, thereby adjusting the length of the traction member 5 to adapt to cracks 1 of different widths, so as to ensure the traction and limiting effect of the traction member 5 on the crack 1, thereby applying prestress to the crack 1.

[0030] Furthermore, a mounting hole 21 for accommodating a fixing rod is provided in the concrete structure layer 2; a tubular expansion member 7 is sleeved on the outer periphery of the end of the fixing rod, wherein a plurality of expansion joints 71 extending to the bottom are axially provided around the lower part of the expansion member 7, and the lower part of the inner hole 72 of the expansion member 7 shrinks toward the center to form a tapered hole 73 that is larger at the top and smaller at the bottom, and the expansion joint 71 is connected to the tapered hole 73; when the free end of the fixing rod is inserted into the expansion member 7 and advances to the tapered hole 73, the lower part of the expansion member 7 is stretched open and pressed against the mounting hole 21 with the cooperation of the expansion joint 71, and the fixing rod is firmly connected to the concrete structure layer 2, and the two are not easy to loosen, thereby realizing the fixed connection between the traction member 5 and the concrete structure layer 2. In order to facilitate the insertion of the fixing rod into the inner hole 72, the free end of the fixing rod can be set as a pointed end.

[0031] Furthermore, a plurality of stop grooves 74 which are larger at the top and smaller at the bottom are arranged on the upper part of the inner hole 72 along its length direction, and a plurality of stop teeth 61 which cooperate with the stop grooves 74 are formed on the outer periphery of the fixing rod protruding outward along its length direction. When the expansion member 7 expands, the stop teeth 61 cooperate with the adjacent stop grooves 74 to limit the fixing rod from moving away from the concrete structure layer 2, thereby preventing the fixing rod and the expansion member 7 from loosening; wherein, the stop teeth 61 and the stop grooves 74 can be arranged to be inverted frustum shapes.

[0032] Furthermore, the outer surface of the tightening screw tube 52 is a regular polygon, and a wrench can be used to insert into the polygonal structure to drive and tighten the tightening screw tube 52.

[0033] Furthermore, the outer surface of the fastening screw tube 52 is circular, and the middle part of the outer surface of the fastening thread is provided with anti-slip grooves along its circumference to facilitate the application of force to it for screwing.

[0034] Furthermore, the outer periphery of the tightening screw tube 52 is fixedly connected to the rotating protrusion 53 to facilitate the rotation of the traction member 5 .

[0035] The working principle of this utility model:

[0036] See also Figure 1-5 A covering trough 3 communicating with the surface of the concrete structure layer 2 is arranged on the upper part of the crack 1 along its development direction, so that the length of the covering trough 3 is greater than the length of the crack 1, and the width of the covering trough 3 is greater than the width of the crack 1.

[0037] A plurality of pairs of mounting holes 21 are provided in the concrete structure layer 2 along the development direction of the crack 1, so that each pair of mounting holes 21 is disposed on both sides of the crack 1, and the spacing between each pair of mounting holes 21 is adjusted according to the different widths of the crack 1, and an expansion piece 7 is placed in each mounting hole 21; the fastening screw 52 is rotated to adjust the distance between the two fixing rods, so that the two fixing rods are respectively inserted into the inner holes 72 of the expansion piece 7 adjacent thereto, and during the connection process between the fixing rod and the expansion piece 7, the traction piece 5 is then close to the crack 1 until it is placed in the covering sink 3, and when the tip of the fixing rod advances into the conical hole 73 and, with the cooperation of the expansion joint 71, the lower part of the expansion piece 7 is stretched open, the expansion piece 7 is pressed tightly against the mounting hole 21, and the connection between the fixing rod and the concrete structure layer 2 is completed, and at the same time, the stop tooth 61 on the fixing rod cooperates with the stop groove 74 in the inner hole 72 to prevent the fixing rod from loosening from the expansion piece 7 after placement, thereby ensuring the firmness of the connection between the two.

[0038] After the traction piece 5 is set along the crack 1, non-shrinkage mortar or epoxy resin-based adhesive is poured into the crack 1 and the covering trough 3 in turn until it is flush with the surface of the concrete structure layer 2. After the repair material 4 solidifies, the traction piece 5 is tightly connected to the concrete structure layer 2, and the surface of the concrete structure layer 2 remains flat.

[0039] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A structure for preventing and controlling cracks on the surface of a concrete building, comprising a covering trough (3) arranged on the upper part of a crack (1) along the direction of its development and connected to the surface of a concrete structure layer (2), the crack (1) and the covering trough (3) being filled with a repair material (4), characterized in that: A plurality of traction members (5) are arranged at intervals in the covering trough (3) and are distributed along the development direction of the crack (1); each of the traction members (5) is a retractable member arranged across the crack (1); and each of the traction members (5) is provided with connecting members (6) connected to the concrete structure layer (2) at both ends.

2. A concrete building surface crack prevention structure according to claim 1, characterized in that: The traction member (5) comprises two cross bars (51) arranged opposite to each other, and a fastening screw tube (52) arranged between the two cross bars (51) for connecting the two cross bars (51); both end surfaces of the fastening screw tube (52) are provided with threaded holes (521) inwardly; the two cross bars (51) are arranged on both sides of the crack (1); the outer circumferences of the opposite ends of the two cross bars (51) are provided with external threads matching the internal threads of the threaded holes (521); and the free ends of the two cross bars (51) are fixedly connected to the adjacent connecting members (6).

3. A concrete building surface crack prevention structure according to claim 2, characterized in that: The connecting member (6) is a fixing rod formed by outwardly protruding free ends of the crossbar (51), the fixing rod extending into the concrete structure layer (2) and fixedly connected thereto via an expansion member (7).

4. A concrete building surface crack prevention structure according to claim 3, characterized in that: The concrete structure layer (2) is provided with a mounting hole (21) for accommodating the fixing rod; a tubular expansion member (7) is sleeved on the outer periphery of the fixing rod; a plurality of expansion joints (71) extending to the bottom of the expansion member (7) are provided along the axial direction around the expansion member (7); the lower part of the inner hole (72) of the expansion member (7) shrinks toward the center to form a tapered hole (73) with a larger upper part and a smaller lower part; the expansion joint (71) is in communication with the tapered hole (73).

5. A concrete building surface crack prevention structure according to claim 4, characterized in that: A plurality of stop grooves (74) which are larger at the top and smaller at the bottom are arranged at the upper part of the inner hole (72) along its length direction; a plurality of stop teeth (61) which match the stop grooves (74) are formed on the outer periphery of the fixing rod protruding outwards along its length direction.

6. A concrete building surface crack prevention structure according to claim 5, characterized in that: The anti-recession tooth (61) and the anti-recession groove (74) are arranged in an inverted truncated cone shape.

7. A concrete building surface crack prevention structure according to claim 3 or 5, characterized in that: The free end of the fixing rod is a pointed end.

8. A concrete building surface crack prevention structure according to claim 2, characterized in that: The outer periphery of the tightening screw tube (52) is fixedly connected to the rotating protrusion (53).

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