Adjustable prestressed raft

Abstract

The utility model requests protecting an adjustable pre -stress raft, its technical scheme main points have the connecting piece, set up in the pre -tightening device and the resistance device of connecting piece both ends, both ends pre -tightening device pre -tightening connecting piece, and cooperate resistance device restriction connecting piece shrink, connecting piece, pre -tightening device and resistance device all set up a plurality of, and cross setting form grid -like, this technical scheme has the beneficial effect: through pre -tightening device to connecting piece exert pre -stress, and utilize resistance device restriction connecting piece shrink, make raft to be able to according to construction process load change dynamic adjustment structure stress, effectively avoid uneven settlement and structure stress concentration.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering, and more specifically, to an adjustable prestressed raft slab. Background Technology

[0002] In existing technologies, raft foundations used in building construction are mostly fixed structural designs, whose stiffness and load-bearing capacity are determined at the initial stage of construction. However, as construction progresses, changes in loads occur due to factors such as pouring cement, installing and dismantling formwork, scaffolding, and construction equipment. The fixed raft foundation designed at the initial stage of construction may not be able to adapt to the changing load requirements in the later stages of construction, which may lead to raft foundation angular deformation and thus structural tilting. Utility Model Content

[0003] To address the shortcomings of existing technologies, an adjustable prestressed raft slab is provided. This device can overcome the disadvantage that fixed raft slabs in existing technologies cannot adapt to load changes.

[0004] To achieve the above objectives, the following technical solution is provided: an adjustable prestressed raft slab, comprising connectors, pre-tightening devices and anti-reverse devices disposed at both ends of the connectors; The pre-tightening devices at both ends pre-tighten the connecting parts, and cooperate with the reverse blocking device to restrict the shrinkage of the connecting parts; Several connectors, pre-tightening devices, and reverse-blocking devices are provided, and they are arranged in a grid pattern.

[0005] A further optimization of this utility model includes a separator sleeve; The connector is fitted with a separator sleeve to prevent the connector from sticking together when cement is poured.

[0006] In a further optimization of this utility model, the reversing device includes a one-way locking mechanism, which cooperates with the pre-tightening device to unlock in the pre-tightening direction and lock in the reverse direction.

[0007] In a further optimization of this utility model, the one-way locking mechanism includes a pawl assembly, which cooperates with the pre-tightening device to unlock in the pre-tightening direction and lock in the reverse direction.

[0008] In a further optimization of this invention, the ratchet assembly includes at least two symmetrically arranged ratchet assemblies.

[0009] In a further optimization of this invention, the pre-tightening device includes a force sensor, which is used to monitor the pre-tightening stress value of the connector in real time.

[0010] The technical solution has the following advantages: by applying prestress to the connectors through the pre-tightening device and by using the counter-resistance device to limit the shrinkage of the connectors, the raft slab can dynamically adjust the structural stress according to the changes in the load during construction, effectively avoiding uneven settlement and structural stress concentration. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0012] Figure 2 This is a three-dimensional structural diagram of the reverse blocking device.

[0013] Figure 3 This is a schematic diagram of the planar structure of the reverse blocking device.

[0014] Figure 4 This is a three-dimensional structural diagram of the reverse blocking device.

[0015] Reference numerals: 1. Connector; 2. Pre-tightening device; 3. Reverse blocking device; 31. One-way locking mechanism; 311. Pawl assembly; 4. Separator sleeve. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings, and the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0017] Reference Figure 1-4 As shown, an adjustable prestressed raft slab includes a connector 1, a pre-tightening device 2 and a reverse-resistance device 3 disposed at both ends of the connector 1. The pre-tightening devices 2 at both ends pre-tighten the connector 1, and cooperate with the reverse blocking device 3 to restrict the contraction of the connector 1; Several connectors 1, pre-tightening devices 2 and reverse blocking devices 3 are provided, and they are arranged in a grid pattern.

[0018] Connector 1 can be made of high-strength prestressed steel strand or threaded steel bar, with its two ends fixedly connected to the pre-tightening device 2 respectively; The pre-tightening device 2 can be a hydraulic jack or a mechanical tensioner, which applies tension to pre-tighten the connecting piece 1; The reverse blocking device 3 can be installed outside the pretensioning device 2, and its interior has a locking structure that engages or snaps with the connecting member 1. When the pretensioning device 2 tensions the connecting member 1, the reverse blocking device 3 allows the connecting member 1 to move in the tensioning direction; After tensioning is completed, the anti-reverse device 3 restricts the retraction of the connector 1; Multiple connectors 1 are arranged in a cross pattern to form a spatial grid structure, and cooperate with the pre-tightening device 2 and the anti-reverse device 3 to adjust the pre-tightening force. When the raft slab formed by multiple connectors 1 is poured with concrete, the different prestress values ​​of each group of connectors 1 can be adjusted when the subsequent construction load changes, so as to actively adjust the local resistance of the raft slab to the building load. This allows the raft slab to find the corresponding single-unit connector 1 according to load changes during construction, and readjust the pre-tightening force of connector 1 through pre-tightening device 2, thereby improving the local adaptability to variable loads. Compared with existing technologies, the device proposed in this solution will increase the cost of purchasing equipment in the early stage. However, when no adjustment is needed after the later construction is completed, the two ends of the connector 1 can be fixed by means of a steel bar bracket (angle steel / steel bracket). After fixing, the pre-tightening device 2 and the anti-reverse device 3 can be removed and the device can continue to be used on other construction sites, achieving reuse and reducing costs. Apart from the initial device cost, no further cost is required in the later stage.

[0019] Preferably, the adjustable prestressed raft slab also includes a partition sleeve 4, which is provided on the outer sleeve of the connector 1 to prevent the connector 1 from sticking together when pouring cement.

[0020] The separator sleeve 4 can be a tubular structure of polytetrafluoroethylene, which is sleeved on the outside of the connector 1. During the concrete pouring process, the separator sleeve 4 can effectively prevent cement slurry from seeping into the surface of the connector 1 and sticking to it. This design ensures that connector 1 can still expand and contract freely after the concrete hardens, ensuring that the pre-tightening device 2 can apply effective prestress to the concrete through connector 1, and avoiding the inability to adjust the prestress of connector 1 due to adhesion.

[0021] Preferably, the reversing device 3 includes a one-way locking mechanism 31, which cooperates with the pre-tightening device 2 to unlock in the pre-tightening direction and lock in the reverse direction.

[0022] The one-way locking mechanism 31 may be equipped with a motor and an abutting block for abutting the connecting member 1. When the pre-tightening device 2 moves in the tensioning direction, the motor drives the abutting block away from the connecting member 1, thereby allowing the connecting member 1 to move smoothly and unlock. When the pre-tightening device 2 stops or reverses, the motor drives the contact block to abut against the connecting member 1, restricting the connecting member 1 from moving further, thereby achieving locking; This mechanism ensures that connector 1 is locked and unlocked during the application of prestress, effectively preventing stress relaxation and guaranteeing the long-term stability of prestress.

[0023] Preferably, the one-way locking mechanism 31 includes a pawl assembly 311, which cooperates with the pre-tightening device 2 to unlock in the pre-tightening direction and lock in the reverse direction.

[0024] The ratchet assembly 311 consists of at least one ratchet, a check pawl, and a spring. When the pre-tightening device 2 stretches the connecting piece 1, it drives the ratchet to rotate. The check pawl and the spring cooperate with each other to rotate the ratchet. When the pretensioning device 2 stops stretching, the spring drives the check pawl to engage in the adjacent ratchet tooth groove of the ratchet, restricting the rotation of the ratchet and thus restricting the contraction of the connecting piece 1.

[0025] Preferably, the pawl assembly 311 includes at least two symmetrically arranged pawl assemblies 311.

[0026] Two pawl assemblies 311 are symmetrically arranged on both sides of the connector 1. They lock and unlock simultaneously through synchronous action. The symmetrical design can make the meshing force evenly distributed, avoid locking failure caused by damage on one side, and further improve locking stability and device life.

[0027] Preferably, the pre-tightening device 2 includes a force sensor, which is used to monitor the pre-tightening stress value of the connector 1 in real time.

[0028] The force sensor is installed at the connection between the pre-tightening device 2 and the connector 1. It is a resistance strain gauge or piezoelectric sensor, and its signal output terminal is connected to an external monitoring system. When it is necessary to adjust the local resistance, the required stress value is first calculated. During the tensioning process, the force sensor detects the prestress value of the connector 1 in real time and feeds the data back to the control system. The data is compared with the pre-calculated value to achieve precise control and long-term monitoring of the stress value. This design allows for dynamic adjustment of prestress based on actual load changes, ensuring that the raft slab is always in an optimal stress state.

[0029] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. An adjustable pre-stressed raft characterized in that, It includes connectors, pre-tightening devices at both ends of the connectors, and reverse blocking devices; The pre-tightening devices at both ends pre-tighten the connecting parts, and cooperate with the reverse blocking device to restrict the shrinkage of the connecting parts; Several connectors, pre-tightening devices, and reverse-blocking devices are provided, and they are arranged in a grid pattern.

2. The adjustable pre-stressed raft as claimed in claim 1, wherein, It also includes a separator sleeve; The connector is fitted with a separator sleeve to prevent the connector from sticking together when cement is poured.

3. The adjustable pre-stressed raft as claimed in claim 1, wherein, The reversing device includes a one-way locking mechanism, which cooperates with the pre-tightening device to unlock in the pre-tightening direction and lock in the reverse direction.

4. The adjustable pre-stressed raft according to claim 3, wherein, The one-way locking mechanism includes a pawl assembly, which cooperates with the pre-tightening device to unlock in the pre-tightening direction and lock in the reverse direction.

5. The adjustable pre-stressed raft according to claim 4, wherein, The pawl assembly includes at least two symmetrically arranged pawl assemblies.

6. The adjustable pre-stressed raft as claimed in claim 1, wherein, The pre-tightening device includes a force sensor, which is used to monitor the pre-tightening stress value of the connector in real time.

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