Cloth self-locking anchorage device and prestressed anchoring device for concrete ground

Abstract

The utility model relates to the technical field of concrete construction, and discloses a cloth self-locking anchorage device and a prestress anchoring device for a concrete ground. The two ends of the first cloth rolling shaft are connected to the fixing frame; the two ends of the second cloth rolling shaft are connected to the fixing frame, and the second cloth rolling shaft and the first cloth rolling shaft are arranged in parallel. When a prestressed concrete structure is constructed, the prestressed anchoring device for the concrete floor adopting the cloth self-locking anchorage device can fix the carbon fiber cloth and the carbon fiber gridding cloth so as to stretch the carbon fiber cloth and the carbon fiber gridding cloth.

Description

TECHNICAL FIELD

[0001] The utility model relates to concrete construction technical field, specifically, relate to a cloth self -locking anchorage device and prestressed anchoring device for concrete floor. BACKGROUND

[0002] If the colored concrete pavement for theme park has ground cracking problem, not only will it cause safety problem, but also will directly affect the impression of tourists. Due to the influence of the difference between daytime and night environment humidity, the ground plate will repeatedly warp, and the fatigue stress is formed. Due to the influence of uneven settlement of foundation, the ground plate bottom part is partially empty, and the ground plate forms deadweight stress under the action of deadweight. When the sum of fatigue stress, deadweight stress and other destructive stresses exceeds the self stress, the ground plate will crack, which seriously affects the use performance of the ground plate. Therefore, the prestressed reinforcement for resisting cracking of the colored concrete floor plate is particularly important.

[0003] A Chinese patent (publication number: CN214459755U) invents a prestressed anchoring device for concrete bridge. Including rectangular frame, fixed part, tensioning part and carbon fiber cloth. The waist type through hole is opened in the two side edges of the rectangular frame, and the tensioning part is slidingly arranged along the length direction of the rectangular frame; The fixed part is anchored on the bridge construction surface; The fixed part and the tensioning part both include clamping assembly, the clamping assembly includes cloth clamping shaft and fixed base; The fixed base clamps the spliced cloth clamping shaft and limits the circumferential rotation of the two cloth clamping shafts; The tensioning part further includes a tensioning top plate, a jack is installed between the tensioning top plate and the inner side of the rectangular frame, the jack drives the tensioning top plate to move, the tensioning top plate drives the clamping assembly of the tensioning part to move along the length direction of the rectangular frame, and the carbon fiber cloth is tensioned in place; The fastening anchor bolt passes through the anchor hole, and the clamping assembly of the tensioning part is anchored on the bridge construction surface. Effectively solve the problems of complex structure, troublesome construction, difficult to guarantee the tensile strength of carbon fiber cloth and low construction efficiency of existing carbon fiber cloth tensioning anchor. But the product has the following shortcomings:

[0004] 1. The product can only prestress tensioning for carbon fiber cloth, and cannot prestress tensioning for carbon fiber mesh cloth; 2. The tensioning part of the product is not in the same horizontal line with the prestress force direction, so that the eccentric moment generated can only be balanced by the rectangular frame, and cannot be tensioned by the tensioning part alone; 3. The product can only be used for prestressed reinforcement of concrete bridge, and cannot be used for prestressed reinforcement of concrete plate; 4. The tensioning part of the product is complex to install after winding the carbon fiber cloth with the rectangular frame; 5. The rectangular frame of the product is large in size and not easy to move and install. UTILITY MODEL CONTENTS

[0005] The utility model discloses in order to solve above-mentioned technical problem and makes, one of its purposes is at, provide a kind of cloth self-locking anchorage device, carbon fiber cloth, carbon fiber mesh cloth can be fixed to be tensioned to it.

[0006] Another purpose of the utility model is to provide a kind of prestressed anchorage device for concrete floor, carbon fiber cloth, carbon fiber mesh cloth can be prestressed tensioned, and then construction prestressed concrete slab.

[0007] According to one embodiment of the utility model, a cloth self-locking anchorage device is provided, comprising: a fixing frame; a first cloth winding shaft, both ends of which are connected to the fixing frame; a second cloth winding shaft, both ends of which are connected to the fixing frame, and which is arranged in parallel with the first cloth winding shaft.

[0008] As one embodiment, both ends of the first cloth winding shaft are fixed or slidingly arranged on the fixing frame; both ends of the second cloth winding shaft are fixed or slidingly arranged on the fixing frame.

[0009] As one embodiment, a through hole is formed on the fixing frame for the tensioning rod to pass through, and the through hole is in the same plane as the upper side or lower side of the first cloth winding shaft and the second cloth winding shaft.

[0010] As one embodiment, the middle part of the first cloth winding shaft and the second cloth winding shaft is a plane, and the front and rear ends are arc surfaces.

[0011] According to one embodiment of the utility model, a prestressed anchorage device for concrete floor is provided, comprising: a pre-buried part, which is pre-buried in a bottom concrete structure, and both ends of which form positioning rods extending out of the bottom concrete structure; a fixing part, which is fixedly connected to the positioning rod at one end, and on which the cloth self-locking anchorage device described above is fixedly arranged; a tensioning part, which is fixedly connected to the positioning rod at the other end, and on which the cloth self-locking anchorage device is arranged.

[0012] As one embodiment, the pre-buried part comprises: two positioning embedded plates, which are arranged at both ends of the bottom concrete structure; and a plurality of steel bars, both ends of which are fixedly connected to the positioning embedded plates; wherein the lower end of the positioning rod is fixedly connected to the positioning embedded plates, and the upper end of the positioning rod forms external threads.

[0013] As one embodiment, the fixing part comprises a first bracket fixedly connected to the positioning rod, and the first bracket is provided with a connecting rod fixedly connected to the cloth self-locking anchorage device.

[0014] As an embodiment, the tensioning part comprises: a second support, bolted to the positioning rod; a tensioning rod, arranged in the second support, one end connected to the cloth self-locking anchor, the other end provided with a counterforce plate; a fixing nut, threaded to the tensioning rod, on the side of the second support away from the cloth self-locking anchor; a jack, two ends respectively abutting against the second support and the counterforce plate.

[0015] As an embodiment, the jack, the tensioning rod and the connecting rod are in the same plane, and are in the same plane with the upper side or the lower side of the first cloth winding shaft and the second cloth winding shaft.

[0016] As an embodiment, a pressure sensor is further arranged between the jack and the counterforce plate.

[0017] According to the above description and practice, the cloth self-locking anchor of the utility model is provided with two parallel cloth winding shafts in the fixing frame, the prestressed cloth is wound on the two cloth winding shafts in sequence, and then the prestressed cloth is tensioned, and the prestressed cloth is fixed by the friction force between the inner and outer layers of the cloth shaft and the friction force between the cloth and the cloth shaft. The traditional clamping type cloth clamp can form sufficient contact area with carbon fiber cloth during work, but cannot form sufficient contact area with carbon fiber mesh cloth, and if the carbon fiber mesh cloth is directly clamped and fixed, the carbon fiber mesh cloth is easy to break. The cloth self-locking anchor in the utility model fixes the cloth by the friction force between the cloth and the cloth winding shaft, and the cloth is not easy to break.

[0018] The prestressed anchoring device for concrete floor of the utility model adopts the above-mentioned cloth self-locking anchor, can set the prestressed cloth such as carbon fiber mesh cloth in the prestressed anchoring device for concrete floor during construction of the prestressed anchoring device for concrete floor, and further improves the strength of the concrete plate, and prevents the concrete plate from being warped and cracked during use. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the cloth self-locking anchor involved in an embodiment of the utility model.

[0020] Figure 2 It is a schematic view of two cloth self-locking anchors involved in an embodiment of the utility model during tensioning of cloth.

[0021] Figure 3 It is a schematic view of the prestressed anchoring device for concrete floor involved in an embodiment of the utility model. Figure 2 It is a schematic view of the A-A section.

[0022] Figure 4a It is a schematic view of the prestressed anchoring device for concrete floor involved in an embodiment of the utility model.

[0023] Figure 4b The prestressed anchoring device for concrete floor in an embodiment of the present application.

[0024] Figure 5 The detail display diagram of the material self-locking anchor, the second support and the counterforce plate in the prestressed anchoring device for concrete floor in an embodiment of the present application.

[0025] Figure 6a And Figure 6b The three-dimensional structure schematic diagram of the embedded part in the prestressed anchoring device for concrete floor in an embodiment of the present application under two different viewing angles.

[0026] Figure 7 The schematic diagram of the embedded part in the prestressed anchoring device for concrete floor in an embodiment of the present application after being installed in the bottom concrete structure.

[0027] Figure 8 The schematic diagram of the prestressed anchoring device for concrete floor in an embodiment of the present application when prestressed cloth is stretched.

[0028] Figure 9 The schematic diagram of the prestressed anchoring device for concrete floor in an embodiment of the present application when the top concrete structure is constructed.

[0029] The reference signs in the drawings are as follows:

[0030] 1, cloth self-locking anchor; 101, first cloth winding shaft; 102, second cloth winding shaft; 103, fixing frame; 2, second support; 3, counterforce plate; 4, steel bar; 5, positioning embedded plate; 6, positioning rod; 7, connecting rod; 8, fixing nut; 9, jack; 10, pressure sensor; 11, stretching part; 12, fixed part; 13, embedded part; 14, prestressed cloth extension direction; 15, stretching rod extension direction; 16, top concrete structure; 17, bottom concrete structure; 18, connecting steel bar; 19, prestressed cloth; 20, stretching rod; 21, first support. DETAILED DESCRIPTION

[0031] Exemplary embodiments now will be described more fully hereinafter with reference to the accompanying drawings; however, this example embodiment can be implemented in any number of ways, and is not limited to the examples described herein. Rather, applications shall provide a example embodiment with sufficient information to enable others with skill in the art to practice the embodiments without undue experimentation.

[0032] In addition, the accompanying drawings are only schematic and are non-limiting detailed representations of the application. Identical components have been given the same reference numerals, which also back reference where appropriate to features discussed previously. It is to be expressly understood that such drawings are included merely for illustrative purposes and that the application is not limited to the exact arrangement and configuration shown. The scope of the application should be interpreted by the claims and their equivalents. It will be appreciated that for simplicity and clarity of illustration, where appropriate, rigid mounting or structural features shown in the figures have not been shown to scale. In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In other instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

[0033] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0034] According to an embodiment of the present application, a cloth self-locking anchor is provided, please refer to Figures 1 to 3 The cloth self-locking anchor 1 comprises a fixing frame 103, a first cloth winding shaft 101 and a second cloth winding shaft 102. The two ends of the first cloth winding shaft 101 are connected to the fixing frame 103, and the two ends of the second cloth winding shaft 102 are connected to the fixing frame 103 and are arranged in parallel with the first cloth winding shaft 101.

[0035] The function of the fixing frame 103 is to arrange the two cloth winding shafts in parallel, so as to ensure that the cloth can be stably wound on the cloth winding shaft. Therefore, in this embodiment, the fixing frame 103 only comprises two oppositely arranged rod members. In other embodiments, other structures can be added, such as a plate body connected between the two rod members, which can improve the structural strength of the fixing frame 103.

[0036] As shown in the drawings, Figure 2 and Figure 3As shown, two cloth self-locking anchorage devices 1 are adopted to fix and tension the strip-shaped cloth, one end of the cloth is cross-wound on the first cloth winding shaft 101 and the second cloth winding shaft 102, there is only one layer of cloth on the outer periphery of the second cloth winding shaft 102 at the inner end, and two layers of cloth are formed on the first cloth winding shaft 101 at the outer end. When the two cloth self-locking anchorage devices 1 are tensioned to both sides, the cloth can be fixed by the friction force between the inner and outer layers of cloth on the cloth shaft and the friction force between the cloth and the cloth shaft. Compared with the clamping fixing mode, the cloth is not easy to break by the friction force fixing mode, and therefore the cloth with sparse fiber distribution such as carbon fiber mesh cloth can be tensioned.

[0037] In this embodiment, the two ends of the first cloth winding shaft 101 are fixedly connected to the fixed frame 103, and the two ends of the second cloth winding shaft 102 are fixedly connected to the fixed frame 103, so that the end portions of the cloth can be stably fixed in use. In other embodiments, either one or both of the two cloth winding shafts can be slidingly connected to the fixed frame 103, and the distance between the two cloth winding shafts can be adjusted when the cloth is wound thereon, thereby facilitating the winding of the cloth on the two cloth winding shafts.

[0038] As an embodiment, a through hole is formed on the fixed frame 103 for the tension rod to pass through, the through hole is in the same plane as the upper side or lower side of the first cloth winding shaft 101 and the second cloth winding shaft 102, when the two cloth self-locking anchorage devices 1 are stretched by the tension rod, the tension force is in the same plane as the extension direction of the cloth, and eccentric moment does not occur, so that the tensioning process can be smoothly performed.

[0039] As an embodiment, the middle part of the first cloth winding shaft 101 and the second cloth winding shaft 102 is a plane, and the front and rear ends are arc surfaces, the cloth wound on the two cloth winding shafts can have a larger contact area, the friction force during tensioning can be improved, and the cloth is not easy to break in the anchorage device.

[0040] According to an embodiment of the utility model, a prestressed anchoring device for concrete ground is provided, please refer to Figures 4a to 9 The prestressed anchoring device for concrete ground comprises a pre-buried part 13, a fixed part 12 and a tensioning part 11.

[0041] The pre-buried part 13 is pre-buried in the bottom concrete structure 17, and the two ends are formed with positioning rods 6 extending out of the bottom concrete structure 17. The fixed part 12 is fixedly connected to the positioning rod 6 at one end, and the cloth self-locking anchorage device 1 is fixedly arranged thereon. The tensioning part 11 is fixedly connected to the positioning rod 6 at the other end, and the cloth self-locking anchorage device 1 is arranged thereon.

[0042] The prestressed anchoring device for concrete floor can be applied in the construction process of the prestressed concrete floor. The prestressed concrete floor is provided with a prestressed cloth 19, such as carbon fiber cloth or carbon fiber mesh cloth, which can improve the strength of the concrete floor and prevent the concrete floor from warping and cracking during use. The prestressed anchoring device for concrete floor is used to tension the prestressed cloth 19 during the construction process, and then the concrete is poured.

[0043] When the prestressed anchoring device for concrete floor is used to construct the prestressed concrete floor, the concrete floor needs to be divided into a bottom concrete structure 17 and a top concrete structure 16. The bottom concrete structure 17 is used to embed the embedded part 13 of the device, and the top concrete structure 16 is used to accommodate the prestressed cloth 19. A plurality of connecting steel bars 18 are arranged between the two concrete structures to effectively transfer the prestress and improve the bonding strength of the two structures.

[0044] When the prestressed anchoring device for concrete floor is used, the embedded part 13 is first embedded in the bottom concrete structure 17, and the positioning rods 6 at both ends extend out of the bottom concrete structure 17 to be used for setting the fixed part 12 and the tensioning part 11. The cloth self-locking anchor 1 of the fixed part 12 is in a fixed state, and the cloth self-locking anchor 1 of the tensioning part 11 can move to the side during the tensioning process. Then the prestressed cloth between the two cloth self-locking anchors 1 is tensioned to generate prestress. Then the formwork is set around the prestressed cloth 19 to pour concrete to form the top concrete structure 16 with prestress. Through the prestressed anchoring device for concrete floor, the carbon fiber mesh cloth and other prestressed cloth can be arranged in the concrete floor during construction, thereby improving the strength of the concrete slab and preventing warping and cracking during use. And the prestressed cloth will not be broken during construction.

[0045] As an embodiment, as shown in Figure 6a and Figure 6b The embedded part 13 includes two positioning embedded plates 5, a plurality of steel bars 4 and a positioning rod 6. The two positioning embedded plates 5 are arranged at both ends of the bottom concrete structure 17. The steel bars 4 are arranged between the two positioning embedded plates 5 and are fixedly connected with the positioning embedded plates 5 at both ends. Only one steel bar 4 is shown in the figure. In actual application, the number of steel bars 4 can be adjusted according to the width of the bottom concrete structure 17 to ensure that the embedded part 13 can be in a firm state during tensioning. The lower end of the positioning rod 6 is fixedly connected to the two positioning embedded plates 5 by bolting, and the upper end extends to the outside of the bottom concrete structure 17 and is formed with external threads to facilitate connection with the fixed part 12 and the tensioning part 11. The steel bars 4 can effectively reduce the warping of the bottom concrete structure 17.

[0046] As an embodiment, as shown inFigure 4a As shown, the fixed part 12 further comprises a first support 21 bolted on the positioning rod 6, and the first support 21 is provided with a connecting rod 7 fixedly connected with the cloth self-locking anchor 1. The connecting rod 7 can be a threaded rod, and the two ends of the connecting rod 7 are respectively inserted into the cloth self-locking anchor 1 and the first support 21, and then the cloth self-locking anchor 1 and the first support 21 can be firmly connected together through bolts, which is convenient for assembling the fixed part 12.

[0047] As an embodiment, as shown in Figure 4a , Figure 4b and Figure 5 , the tensioning part 11 further comprises a second support 2, a tensioning rod 20, a counterforce plate 3, a fixing nut 8 and a jack 9. The second support 2 is similar in structure to the first support 21, and is used to realize the connection with the positioning rod 6, for example, by being bolted on the positioning rod 6 at the other end. Two tensioning rods 20 are inserted into the second support 2, one end of each of the two tensioning rods 20 is connected with the cloth self-locking anchor 1, and the other end of each of the two tensioning rods 20 is provided with the counterforce plate 3. The fixing nut 8 is threadedly connected on the tensioning rod 20, and is located on the side of the second support 2 away from the cloth self-locking anchor 1, and is used to fix the tensioning rod 20 on the second support 2 after tensioning. Figure 4a As shown, the tensioning rod 20 is a threaded rod, and the two ends of the tensioning rod 20 are inserted into the cloth self-locking anchor 1 and the counterforce plate 3, and the end portions are provided with nuts. The two ends of the jack 9 are respectively abutted against the second support 2 and the counterforce plate 3. When the jack 9 is forced, the counterforce plate 3 is pushed to move towards the left end in Figure 4a , and the cloth self-locking anchor 1 of the tensioning part 11 can be subsequently driven to move towards the left end, so that the pre-stressed cloth between the two cloth self-locking anchors 1 is in a pre-stressed state.

[0048] Further, a pressure sensor 10 is arranged between the jack 9 and the counterforce plate 3, which can monitor the size of the tensioning force in real time.

[0049] As an embodiment, the jack 9, the tensioning rod 20 and the connecting rod 7 are in the same plane, and are in the same plane as the upper side or lower side of the first cloth winding shaft 101 and the second cloth winding shaft 102. Therefore, when tensioning, the acting force of the tensioning can be in the same plane as the tensioning rod 20, the connecting rod 7 and the pre-stressed cloth, and the entire process will not appear eccentric moment, which ensures that the construction process can be smooth and fast.

[0050] Taking the pre-stressed cloth 19 as a carbon fiber mesh as an example, the application method of the prestressed anchoring device for the concrete floor is described. First, the embedded part 13 is arranged in the bottom concrete structure 17, and then the carbon fiber mesh is dipped in glue, and the cloth self-locking anchor 1 is wound when the glue is not dry. The specific way of winding is as shown in Figure 3As shown. After the carbon fiber mesh cloth is wound on the material self-locking anchor 1 at both ends, the material self-locking anchor 1 is placed on the bottom concrete structure 17, and the fixed part 12 and the tensioning part 11 are connected to the positioning rods 6 at both ends, respectively. The first support 21 and the second support 2 of the fixed part 12 and the tensioning part 11 are bolted to the positioning rods 6 and are consistent in position. The direction in which the carbon fiber mesh cloth extends after being wound on the material self-locking anchor 1 is the center line through the tensioning rod 20. The jack 9 drives the counterforce plate 3 to move, the counterforce plate 3 drives the material self-locking anchor 1 of the tensioning part 11 through the tensioning rod 20, the material self-locking anchor 1 drives the carbon fiber mesh cloth to be tensioned in the length direction, the value is observed through the pressure sensor 10, until the carbon fiber mesh cloth is tensioned in place, the fixing nut 8 behind the second support 2 is tightened, the jack 9 is unloaded, and at this time, the fixing nut 8 can limit the movement of the material self-locking anchor 1 to the initial position. After the upper concrete structure is poured and reaches the strength, the fixing nut 8 behind the second support 2 is loosened, the carbon fiber mesh cloth exposed outside the concrete is cut off, and the parts such as the material self-locking anchor 1, the fixed part 12 and the tensioning part 11 are removed for repeated use.

[0051] The prestressed anchoring device for the concrete floor can not only prestress and tension the carbon fiber cloth, but also prestress and tension the carbon fiber mesh cloth, and the fixed part of the cloth is not easy to break during tensioning. During tensioning, the extension direction of the tensioning end carbon fiber cloth is on the same horizontal line as the prestress applying direction, and no additional device is needed to balance the eccentric moment, and the tensioning end is consistent with the fixed end. In addition, the device can not only be used for prestressed reinforcement of the concrete floor and the like, but also be used for prestressed reinforcement of the bridge. The device has simple facilities during construction, does not need an additional fixed frame, has small size, strong implementability, wide use place, strong operability and can greatly improve the work efficiency.

[0052] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A self-locking anchor for a cloth, characterized in that, The utility model relates to a cloth self-locking anchor device, comprising: a fixed frame; a first cloth winding shaft, both ends of which are connected to the fixed frame; a second cloth winding shaft, both ends of which are connected to the fixed frame and arranged in parallel with the first cloth winding shaft; wherein both ends of the first cloth winding shaft are fixed or slidingly arranged on the fixed frame; both ends of the second cloth winding shaft are fixed or slidingly arranged on the fixed frame; a through hole is formed in the fixed frame, through which a tension rod can pass, and the through hole is in the same plane as the upper or lower side of the first cloth winding shaft and the second cloth winding shaft.

2. The cloth self-locking anchor device according to claim 1, wherein the middle part of the first cloth winding shaft and the second cloth winding shaft is a plane, and the front and rear ends are arc surfaces.

3. A prestressed anchoring device for concrete floors, characterized in that, The utility model relates to a cloth self-locking anchor device, comprising: a pre-buried part, which is pre-buried in a bottom layer concrete structure and has positioning rods extending out of the bottom layer concrete structure at both ends; a fixed part, which is fixedly connected to the positioning rod at one end and has the cloth self-locking anchor device fixedly arranged thereon; a tensioning part, which is fixedly connected to the positioning rod at the other end and has the cloth self-locking anchor device arranged thereon.

4. The prestressed anchoring device for a concrete floor according to claim 3, wherein the pre-buried part comprises: two positioning embedded plates, which are arranged at both ends of the bottom layer concrete structure, respectively; a plurality of steel bars, both ends of which are fixedly connected to the positioning embedded plates; wherein the lower end of the positioning rod is fixedly connected to the positioning embedded plate, and the upper end of the positioning rod is formed with external threads.

5. The prestressed anchoring device for a concrete floor according to claim 4, wherein the fixed part comprises a first support bolted to the positioning rod, and the first support has a connecting rod fixedly connected to the cloth self-locking anchor device.

6. The prestressed anchoring device for a concrete floor according to claim 5, wherein the tensioning part comprises: a second support bolted to the positioning rod; a tension rod, which is arranged in the second support and connected to the cloth self-locking anchor device at one end and provided with a counterforce plate at the other end; a fixed nut, which is threadedly connected to the tension rod and located on the side of the second support away from the cloth self-locking anchor device; a jack, both ends of which are respectively abutted against the second support and the counterforce plate.

7. The prestressed anchoring device for a concrete floor according to claim 6, wherein the jack, the tension rod and the connecting rod are in the same plane and in the same plane as the upper or lower side of the first cloth winding shaft and the second cloth winding shaft.

8. The prestressed anchoring device for a concrete floor according to claim 6, wherein a pressure sensor is further arranged between the jack and the counterforce plate.

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