Cracking monitoring basement bottom plate post-cast strip waterproof structure

Abstract

The utility model discloses a waterproof structure for a post-cast strip of a basement bottom plate with a cracking monitoring function, which belongs to the technical field of basement waterproofing and is reasonable in structure. The left end and the right end of the tension and compression force measuring sensor are of symmetrically-distributed pre-embedded screw structures and are connected with the pre-embedded screws through the connecting screw sleeves respectively, the other ends of the pre-embedded screws need to be fixedly pre-embedded in concrete of a pre-cast bottom plate, a plurality of retaining separation blades are arranged, the firmness is improved, and then through the structural design, the tension and compression force measuring sensor can be conveniently assembled and disassembled. The pre-cast concrete on the left side and the right side of the post-cast strip is connected in an opposite-pulling mode through the force measuring assembly, shrinkage internal stress caused by environment temperature difference can be effectively offset, the situation that the structural sealing performance is damaged due to the fact that a joining seam is enlarged is prevented, and finally tension state information can be monitored and obtained in real time by connecting a force sensor with an external computer. And timely early warning and taking of cracking protection measures are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of basement waterproofing technology, specifically a waterproofing structure for post-pouring strips in basement floor slabs for crack monitoring. Background Technology

[0002] Post-cast strips are temporary construction joints left at appropriate locations in slabs (including foundation slabs), walls, and beams to prevent harmful cracks that may occur in cast-in-place reinforced concrete structures due to uneven temperature and shrinkage, as required by construction specifications. This temporarily divides the structure into several parts. After a certain period of time, the concrete at the construction joint is poured to connect the structure into a whole, allowing for internal shrinkage of the components. Post-cast strips are an effective measure to address both differential settlement and shrinkage stress, and are therefore widely used in engineering projects.

[0003] As attached Figure 3 The diagram shows a commonly used post-cast strip structure in existing technology. Because there are joints on both sides of the post-cast strip (i.e., the junction of the first-cast concrete and the post-cast concrete), when the concrete structures on both sides shrink or settle asynchronously, the sealing of the joints will fail to varying degrees. After the building is put into use, if the groundwater below the post-cast strip increases, water seepage may occur.

[0004] Existing technologies generally employ a waterproof structure using steel plate waterstops at the joints. One side of the steel plate waterstop is pre-embedded in the first-poured concrete layer, and the other side is pre-embedded in the second-poured concrete layer, thus isolating the joint and preventing groundwater from seeping upwards along the joint. However, due to the thermal expansion and contraction of the concrete structure on both sides of the joint with changes in environment or geology, especially when the ambient temperature drops and the concrete shrinks, the joint widens, thereby compromising the waterproof seal of the joint and leaving a potential risk of water seepage. Furthermore, accurate monitoring and maintenance are not possible.

[0005] Therefore, it is necessary to develop a crack monitoring and waterproofing structure for the post-pouring strip of the basement floor slab. Utility Model Content

[0006] The purpose of this utility model is to provide a waterproof structure for the post-pouring strip of the basement floor slab for crack monitoring, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a waterproof structure for post-pouring strip of basement floor slab for crack monitoring, comprising a pre-pouring slab, a roll waterproof layer provided at the bottom of the pre-pouring slab, a cover plate installed at the top center of the pre-pouring slab, a post-pouring strip installed at the bottom of the cover plate, and an installation cavity provided on the upper surface of the post-pouring strip;

[0008] A force measuring component is installed inside the mounting cavity, and isolation wire mesh is installed on both sides of the bottom of the cover plate.

[0009] Preferably, a steel reinforcement frame is installed on both the upper and lower parts of the pre-cast base slab, and a plain concrete pad is provided at the bottom of the waterproof membrane layer.

[0010] Preferably, the inner top of the post-cast strip is provided with pre-embedded screw holes on both sides, and the inner sides of the cover plate are threaded with countersunk screws.

[0011] Preferably, the outer wall of the countersunk screw is threadedly connected to the inner thread of the pre-embedded screw hole seat, and the post-cast strip is located between the opposite sides of the pre-cast base plate.

[0012] Preferably, the force measuring component includes a tension / compression force sensor, and connecting threaded sleeves are installed on both outer walls of the tension / compression force sensor.

[0013] Preferably, a pre-embedded screw is installed at one end of the connecting screw sleeve, and a positioning nut is threaded onto one side of the outer wall of the pre-embedded screw.

[0014] Preferably, anti-backflow baffles are installed on the other side of the outer wall of the pre-embedded screw, and the anti-backflow baffles are located inside the pre-cast base plate.

[0015] Preferably, a steel plate waterstop is installed at the bottom of the inner part of the isolation wire mesh.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] By placing the tension and compression force sensors on the force measuring assembly in the center of the mounting cavity, and symmetrically distributing pre-embedded screw structures at both ends of the force sensors, each pre-embedded screw is connected to a connecting screw sleeve. The other end of the pre-embedded screw needs to be fixedly embedded in the concrete of the pre-cast base plate, and several anti-backflow baffles are provided to increase the firmness. Through this structural design, the pre-cast concrete on both sides of the post-cast strip is connected by tension through the force measuring assembly, which can effectively offset the shrinkage internal stress caused by the temperature difference, prevent the joint from increasing and damaging the structural seal. Finally, by connecting the force sensors to an external computer, the tension status information can be monitored and obtained in real time, facilitating timely early warning and crack prevention measures. Attached Figure Description

[0018] Figure 1 A schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a magnified schematic diagram of a selected portion of the structure provided by this utility model;

[0020] Figure 3 A schematic diagram of the prior art provided for this utility model.

[0021] In the diagram: 1. Precast base slab; 2. Reinforcing steel frame; 3. Waterproof membrane layer; 4. Plain concrete cushion layer; 5. Cover plate; 6. Post-cast strip; 7. Embedded bolt hole seat; 8. Countersunk screw; 9. Installation cavity; 10. Force measuring component; 101. Tension and compression force sensor; 102. Connecting bolt sleeve; 103. Embedded bolt; 104. Positioning nut; 105. Anti-reverse baffle; 11. Isolation wire mesh; 12. Steel plate waterstop. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] This utility model provides the following technical solution: a waterproof structure for post-pouring strips in basement floor slabs for crack monitoring. Please refer to [link / reference]. Figures 1-3 The system includes a pre-cast base slab 1, a waterproof membrane 3 at the bottom of the pre-cast base slab 1, a steel reinforcement cage 2 installed at the top and bottom of the pre-cast base slab 1, a plain concrete pad 4 at the bottom of the waterproof membrane 3, a cover plate 5 installed at the top center of the pre-cast base slab 1, a post-cast strip 6 installed at the bottom of the cover plate 5, pre-embedded screw holes 7 on both sides of the top of the post-cast strip 6, countersunk screws 8 threadedly connected to both sides of the inside of the cover plate 5, the outer wall of the countersunk screws 8 being threadedly connected to the inside of the pre-embedded screw holes 7, the post-cast strip 6 being located between opposite sides of the pre-cast base slab 1, and an installation cavity 9 on the upper surface of the post-cast strip 6.

[0024] The force measuring assembly 10 is installed inside the mounting cavity 9. The force measuring assembly 10 includes a tension and compression force sensor 101. Both outer walls of the tension and compression force sensor 101 are equipped with connecting threaded sleeves 102. One end of the connecting threaded sleeve 102 is equipped with a pre-embedded screw 103. A positioning nut 104 is threadedly connected to one side of the outer wall of the pre-embedded screw 103. An anti-backflow baffle 105 is installed on the other side of the outer wall of the pre-embedded screw 103. The anti-backflow baffle 105 is located inside the pre-cast base plate 1. Both sides of the bottom of the cover plate 5 are equipped with isolation wire mesh 11. A steel plate waterstop 12 is installed inside the lower part of the isolation wire mesh 11.

[0025] Working Principle: When using this utility model, according to the construction process of the basement floor slab structure, the floor slab is first divided into several pre-cast concrete sections to form a pre-cast floor slab 1. Between two adjacent pre-cast floor slab 1 concrete sections, after the pre-cast concrete has solidified and set, a post-cast strip 6 is formed. The post-cast strip 6 and the concrete in the pre-cast floor slab 1 form a joint. A wire mesh 11 is installed at the joint to determine the pouring boundary when the concrete in the pre-cast floor slab 1 is poured. Using the wire mesh 11 is superior to traditional formwork, mainly because, firstly, it forms a rough surface after pouring, which is beneficial for the bonding between the concrete in the pre-cast floor slab 1 and the post-cast strip 6; secondly, the wire mesh 11 can be left inside the pre-cast floor slab 1, eliminating the need for formwork removal and facilitating the welding and fixing of other framework components. By using the foundation waterproofing structure… The steel plate waterstop 12 has downward-facing edges on both sides, and the bent part of the steel plate waterstop 12 forms a strip steel plate structure facing the water. When the concrete in the first-poured base slab 1 is constructed, it is pre-fixed so that one side is embedded in the concrete layer in the first-poured base slab 1, while the other side is embedded in the post-poured strip 6 during the construction. This achieves the effect of the steel plate waterstop 12 horizontally blocking the joint and preventing groundwater from seeping upward, and the downward bending of both ends of the steel plate waterstop 12 further inhibits the upward seepage of groundwater. By setting the foundation waterproof structure below the first-poured base slab 1, it mainly includes a plain concrete cushion layer 4 and a rolled waterproof layer 3. The plain concrete cushion layer 4 plays a role in foundation laying and leveling, and the rolled waterproof layer 3 plays a role in initial water isolation. In addition, the foundation waterproof structure can also add other functional structural layers.

[0026] Because the concrete structure on both sides of the joint expands and contracts with changes in environment or geology, especially when the ambient temperature drops and the concrete shrinks, the joint widens, thereby compromising its waterproof seal and leaving a risk of water leakage. Furthermore, accurate monitoring and maintenance are impossible. Therefore, this invention also includes a force-measuring component 10.

[0027] The force measuring component 10 includes a tension / compression force sensor 101. The tension / compression force sensor 101 is positioned centrally within the mounting cavity 9. The left and right ends of the force sensor 101 are symmetrically arranged with pre-embedded screws 103, each connected to a connecting sleeve 102. The other end of each pre-embedded screw 103 is fixedly embedded in the pre-cast base slab 1 and equipped with several anti-reverse baffles 105 to increase stability. This structural design allows the concrete in the pre-cast base slab 1 on both sides of the post-cast strip 6 to be tensioned together via the force measuring component 10, effectively offsetting the shrinkage stress caused by environmental temperature differences and preventing the joint from enlarging and compromising the structural seal. Finally, the tension / compression force sensor 101 can be connected to an external computer for real-time monitoring and acquisition of tension. Status information facilitates timely early warning and crack prevention measures. To facilitate the installation and adjustment of pre-tensioning force after structural construction, a positioning nut 104 can be set on the pre-embedded screw 103. After locking the positioning nut 104, the pre-embedded screw 103 and the connecting screw sleeve 102 can be locked. To achieve the tension adjustment effect, the two sides of the tension and compression force sensor 101 can be designed with opposite screw threads. This way, when rotating for adjustment, the distance between the two sides can be smoothly tightened. To facilitate the installation of the force measuring component 10, an installation cavity 9 is opened on the top surface of the post-pouring strip 6. The tension and compression force sensor 101 and other components can be placed in the installation cavity 9. A cover plate 5 is set on the top of the installation cavity 9. Countersunk screws 8 are set on both sides of the cover plate 5. The countersunk screws 8 can be locked through the pre-embedded screw hole seat 7 in the post-pouring strip 6, which facilitates later maintenance.

[0028] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A waterproof structure for post-cast strip of basement floor slab for crack monitoring, comprising a pre-cast floor slab (1), wherein a roll waterproof layer (3) is provided at the bottom of the pre-cast floor slab (1), characterized in that: A cover plate (5) is installed at the top center of the pre-cast base plate (1), and a post-cast strip (6) is installed at the bottom of the cover plate (5). An installation cavity (9) is provided on the upper surface of the post-cast strip (6). The mounting cavity (9) is equipped with a force measuring component (10), and the bottom sides of the cover plate (5) are equipped with isolation wire mesh (11).

2. The waterproof structure for post-cast strip of basement floor slab for crack monitoring according to claim 1, characterized in that: The precast base plate (1) is equipped with a steel reinforcement frame (2) on both the upper and lower sides, and a plain concrete pad (4) is provided at the bottom of the waterproof membrane layer (3).

3. The waterproof structure for post-cast strip of basement floor slab for crack monitoring according to claim 1, characterized in that: The post-cast strip (6) has pre-embedded screw hole seats (7) on both sides of its inner top end, and the cover plate (5) has countersunk screws (8) threaded on both sides of its inner end.

4. The waterproof structure for post-cast strip of basement floor slab for crack monitoring according to claim 3, characterized in that: The outer wall of the countersunk screw (8) is connected to the internal thread of the pre-embedded screw hole seat (7), and the post-cast strip (6) is located between the opposite sides of the pre-cast base plate (1).

5. A waterproof structure for post-cast strip in basement floor slab crack monitoring according to claim 1, characterized in that: The force measuring component (10) includes a tension and compression force sensor (101), and connecting threaded sleeves (102) are installed on both outer walls of the tension and compression force sensor (101).

6. A waterproof structure for post-cast strip in basement floor slab crack monitoring according to claim 5, characterized in that: One end of the connecting sleeve (102) is equipped with a pre-embedded screw (103), and a positioning nut (104) is threadedly connected to one side of the outer wall of the pre-embedded screw (103).

7. A waterproof structure for post-cast strip in basement floor slab crack monitoring according to claim 6, characterized in that: Anti-reverse baffles (105) are installed on the other side of the outer wall of the pre-embedded screw (103), and the anti-reverse baffles (105) are located inside the pre-cast base plate (1).

8. A waterproof structure for post-cast strip in basement floor slab for crack monitoring according to claim 1, characterized in that: A steel plate waterstop (12) is installed on the lower part of the interior of the isolation wire mesh (11).

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