Hydraulic and mechanical combined adjusting device for temporary beam falling of support

Abstract

The utility model relates to a hydraulic and mechanical combined adjusting device for temporary beam falling of a support, which comprises an upper cover plate and a base, a hydraulic jacking device and a mechanical counter-force device are arranged between the upper cover plate and the base, the hydraulic jacking device comprises a jack, one side of the jack is supported on the base, the other side of the jack is contacted with the upper cover plate, and the mechanical counter-force device is connected with the hydraulic jacking device. The mechanical counter-force device comprises a counter-force screw column, one side of the counter-force screw column is in threaded fit with the upper cover plate, the length of the counter-force screw column extending out of the upper cover plate can be adjusted by screwing in and out, and the other side of the counter-force screw column makes contact with the base. The device has the advantages of safely and effectively solving the problem of controlling the bearing reaction of beam falling work, ensuring the relative displacement of upper and lower structures before and after beam falling, ensuring the accurate matching of support mounting bolt holes, and ensuring the reasonable and controllable stress of the structure in the system conversion process before and after beam falling; cost is low, support counterforce and relative displacement of upper and lower structures are reasonable and controllable, structural boundary conditions during temporary beam falling are reasonable, and the device can be recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge construction, in particular to a temporary beam lowering and adjusting device for a support, which is a hydraulic and mechanical composite type. Background Technique

[0002] In recent years, with the popularization and application of technologies such as swing construction, incremental launching construction, and segmental assembly construction, bridge construction involving various cross-railway and grade-separated roads often considers using construction technologies such as swing and incremental launching to solve spatial conflicts. In traditional swing construction, due to construction errors and other reasons, when installing the support, there are often conflicts between the height of the reserved support cushion stone and the structure, and the situation of insufficient support height or excessive support installation height often occurs. This situation often leads to excessive structural reaction force (forced installation with insufficient support installation height) or support void and small support reaction force (excessive support installation height, loosening of temporary shim steel plates, etc.). Since the distribution of the support reaction force in the completed bridge state directly affects the stress state of the structure, abnormal long-term support reaction force distribution may lead to premature diseases of the structure and even affect the later driving safety (such as beam end jumping). Therefore, ensuring the correct distribution of the support reaction force is very important for the structure.

[0003] During traditional beam lowering construction, the difficulties of the support installation method are mainly manifested in the following aspects: First, the construction of the lower structure precedes that of the upper structure. Generally, the support cushion stone will be prepared in advance according to the design elevation, but there may be various errors during the construction of the upper structure, resulting in a large difference between the actual beam bottom elevation and the design state. Second, for super-wide main girders, the lateral deformation cannot be ignored. The height of the pre-prepared support cushion stone cannot be adjusted, and the height of the support itself cannot be adjusted either. Therefore, during beam lowering construction, the problem of support installation is particularly obvious. Third, the weight of the structure cannot be accurately controlled (cumulative over-pouring of concrete structures, weld volume of steel structures), so there is a difference between the actual structure weight and the design expected state. Conventional control methods that only control the design elevation are not precise enough. Fourth, when installing the support during beam lowering, it is generally necessary to super-lift the structure. For wider bridges, the control of the support reaction force requires long-term multi-point jacking. The valve body of the hydraulic structure cannot withstand the long-term construction requirements, and situations such as liquid leakage or pressure relief and beam lowering often occur, which is not only not conducive to the installation of the support structure but also has a certain impact on the safety of the structure.

[0004] For the above reasons, it is very important to accurately correct the support reaction force within a reasonable range. Summary of the Invention

[0005] The object of the present utility model is to provide a hydraulic-mechanical composite temporary beam lowering adjustment device for bearings according to the deficiencies of the above-mentioned prior art. The installation height of the bearing is adjusted by a jack and a bolt device to control a reasonable bearing reaction force. During the beam lowering period, it can be locked by a mechanical structure to meet long-term construction requirements. When installing the bearing, it can be reasonably jacked up by a certain distance to facilitate the installation of the bearing. During the jacking process, the jacking state can be reasonably controlled by a force measuring device to ensure the safety of the structure.

[0006] The object of the present utility model is achieved by the following technical solutions:

[0007] A hydraulic-mechanical composite temporary beam lowering adjustment device for bearings, characterized in that it includes an upper cover plate and a base. A hydraulic jacking device and a mechanical reaction force device are arranged between the upper cover plate and the base. The hydraulic jacking device includes a jack, one side of the jack is supported on the base, and the other side is in contact with the upper cover plate. The mechanical reaction force device includes a reaction force screw column. One side of the reaction force screw column is in threaded cooperation with the upper cover plate and the length extending out of the upper cover plate can be adjusted by screwing in and out. The other side is in contact with the base.

[0008] A piston upper ball joint sliding block is arranged on the top of the piston of the jack, and the jack is in contact with the bottom surface of the upper cover plate through the piston upper ball joint sliding block.

[0009] A force measuring device is arranged between the jack and the base.

[0010] A reaction force ball head is arranged on one side of the reaction force screw column adjacent to the base.

[0011] A base slider is arranged at the position of the base corresponding to the reaction force ball head.

[0012] A reaction force locking nut is arranged on one side of the reaction force screw column adjacent to the upper cover plate.

[0013] The upper cover plate has a cavity matching the reaction force screw column, and the outer wall of the reaction force screw column is in threaded fit connection with the inner wall of the cavity.

[0014] A side wall slider is arranged between the outer side wall of the cavity and the side wall of the jack.

[0015] A plurality of sets of the hydraulic jacking device and the mechanical reaction force device are symmetrically arranged between the upper cover plate and the base, and the mechanical reaction force device is arranged outside the hydraulic jacking device.

[0016] The advantages of the present utility model are:

[0017] 1) It is safer compared with the traditional beam dropping method. There are force measuring devices during the beam dropping and jacking processes to control the bearing reaction force and the state of construction over-jacking reaction force.

[0018] 2) It has the sliding and rotating functions of the permanent bearing, which can ensure that during the temporary support period, the boundary state of the structure is the same as that of the permanent bearing, ensuring the rationality of the structure's force.

[0019] 3) A mechanical locking structure is adopted for temporary shimming, avoiding problems such as possible liquid leakage and pressure relief that the traditional hydraulic system cannot adapt to long-term work, ensuring the safety of the construction process.

[0020] 4) A spiral self-locking structure is adopted, which can achieve stepless adjustment in terms of height. Compared with the traditional method of using shimming steel plates in construction, it has higher precision and the smallest increase in structural reaction force.

[0021] 5) An integrated design is adopted, which is very convenient for construction without assembly. The construction speed and precision can be effectively guaranteed, reducing the construction risk during the system conversion period.

[0022] 6) It can be recycled, saving costs, improving work efficiency and being environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an elevation view of the present utility model (fully retracted state);

[0024] Figure 2 It is an elevation view of the present utility model (fully jacked state);

[0025] Figure 3 It is an elevation view of the present utility model (hydraulic to mechanical state);

[0026] Figure 4 It is a plan view of the present utility model;

[0027] Figure 5 It is an installation view of the present utility model (jacking and adjusting state);

[0028] Figure 6 It is an installation view of the present utility model (bearing installation state);

[0029] Figure 7 It is an installation view of the present utility model (beam dropping state). DETAILED DESCRIPTION OF THE INVENTION

[0030] The features of the present utility model and other related features are further described in detail below through embodiments with reference to the drawings for the understanding of those skilled in the same industry:

[0031] As Figure 1-7As shown in the figure, the markings 1 - 11 in the figure respectively represent: upper cover plate 1, piston upper ball hinge sliding block 2, reaction force screw column 3, reaction force locking nut 4, reaction force ball head 5, base 6, measuring device 7, base slider 8, side wall slider 9, jack 10, upper cover plate cavity 11.

[0032] Embodiment: As Figures 1 to 7 shown, in this embodiment, the hydraulic - mechanical composite device for temporarily adjusting the beam - dropping of the bearing is used to solve the problem of controlling the reaction force of the bearing during the construction of beam - dropping. The installation height of the bearing is adjusted through a hydraulic jacking device and a mechanical reaction force device to control a reasonable reaction force.

[0033] Specifically, the beam - dropping adjustment device in this embodiment is installed near the bearing pad stone on the upper surface of the side pier capping beam. In this embodiment, the piston upper ball hinge sliding block 2 of the jack 10 is used to jack up the upper cover plate 1 of the device, and the upper cover plate 1 is jacked up to a suitable height. During the jacking process, the lateral sliding and rotation of the bearing can be realized through the piston upper ball hinge sliding block 2 and the side wall slider 9.

[0034] In this embodiment, between the jack 10 and the base 6 below it, there is a force - measuring device 7, and this force - measuring device 7 is used to read the reaction force state as Figure 1 and Figure 2 shown.

[0035] After the bearing reaction force adjustment is completed, according to the actual measured reaction force of the force - measuring device 7, after jacking up a certain appropriate height, stop the piston output of the jack 10 and lock the valve of the jack 10. Adjust the reaction force screw column 3 and the reaction force locking nut 4 of the adjustment device until the reaction force ball head 5 at the end of the screw column contacts the base slider 8 set at the corresponding position of the base 6. After the adjustment is completed, lock the reaction force locking nut 4. After determining that the bearing reaction force state is correct, remove the pressure of the jack 10 and complete the cylinder retraction, realizing the transfer of the structural reaction force from the hydraulic state of the jack 10 to the mechanical state of the reaction force screw column 3. At this time, the lateral sliding and rotation functions of the bearing are jointly completed by the base slider 8, the side slider 9, and the reaction force ball head 5, as Figure 3 shown.

[0036] After the device adjustment is completed, adjust the height of the bearing pad stone (adjust with rapid - setting high - strength grout), then install the bearing and adjust the bolt hole positions, as Figure 5 and Figure 6 shown.

[0037] After the support adjustment is completed and the support pad meets the requirements of beam drop, slowly start the jack 10 to re-transmit the structural reaction force to the jack 10. After the reaction force state is consistent with the previous jacking state, pay attention to the gap between the reaction ball head 5 and the base slider 8, adjust the reaction force locking nut 4 and screw the reaction screw column 3 upward into the inner cavity 11 of the upper cover plate 1. After the collection is completed, slowly remove the piston of the jack 10 to complete the transfer of the structural reaction force from the device to the permanent support, remove the adjustment device, and combine Figures 5 to 7 shown.

[0038] This embodiment is used for bridge rotation, jacking, deviation correction or replacement of bearings and other construction and adjustment of beam drop. The beam drop adjustment device in this embodiment can freely adjust the distance between the upper and lower structures to ensure that the bearings are installed under reasonable support reaction forces (the support reaction forces are adjusted by adjusting the clearance height of the bearing installation), and ensure that after the beam drop is completed, the bolt holes of the bearings are accurately matched and not displaced. By controlling the reasonable support reaction forces, the main beam is subjected to reasonable forces (not subject to excess support reaction force bending moment and shear force), ensuring that the bearings are not detached, and avoiding unreasonable forces on local bearings. In the case of special-shaped bridges or multi-bearing working modes, it is difficult to ensure effective control of the support reaction forces when the bearings are installed at different heights and the support reaction forces are different. During the temporary drop of the main beam, when the permanent bearings are not installed, the beam drop adjustment device can also serve as a temporary bearing, and can realize functions such as vertical support, one-way sliding, multi-directional sliding and limited overall rotation.

[0039] This device can be used as a temporary support, and can achieve a certain range of sliding and rotating functions to cope with the deformation of the structure during temporary support. The jacking work is completed by the preset jack, and a sliding steel ball joint is installed on the top of the jack piston, which can realize the rotation and sliding functions of the support at this stage. When jacking to the support installation height, test the combined force of the jack and compare it with the reaction force of the bridge support in the design state. After adjusting the height of the support pad stone, continue to jack up 5mm to facilitate the installation of the support. After the jacking is completed, record the support reaction force and lock the nut, and the jack completes the cylinder work. At this time, the structural reaction force is converted from the jack to the bolt structure of the device. After the support is adjusted, the support installation accuracy meets the design requirements and the support pad stone strength meets the beam drop requirements, start the jack to transfer the reaction force to the piston, remove the temporary support nut and slowly drop the beam to transfer the structural reaction force to the permanent support.

[0040] The use of this device can reasonably control the installation accuracy of the bearing. Since the device itself has the sliding and rotating functions of the bearing, it can ensure that during the temporary support period, the boundary conditions of the structure can be replaced with the conditions of the permanent bearing. When installing the bearing, the relationship between the jacking height of the device and the jacking reaction force can be reasonably referred to. The optimal bearing installation height can be determined by measuring and designing the reasonable bearing reaction force. The bearing pad stone can be trimmed to ensure that the reaction force conditions of the permanent bearing meet the design requirements when the bridge is completed.

[0041] Although the above embodiments have described in detail the concept and embodiments of the object of the present utility model with reference to the accompanying drawings, those of ordinary skill in the art can recognize that various improvements and transformations can still be made to the present utility model without departing from the scope defined by the claims, so they will not be elaborated one by one here.

Claims

1. A hydraulic-mechanical composite support temporary beam adjustment device, characterized in that: It includes an upper cover plate and a base, and a hydraulic jacking device and a mechanical reaction device are arranged between the upper cover plate and the base, wherein the hydraulic jacking device includes a jack, one side of the jack is supported on the base, and the other side of the jack is in contact with the upper cover plate, and the mechanical reaction device includes a reaction screw column, one side of the reaction screw column forms a threaded fit with the upper cover plate and can be adjusted by screwing in and out to extend the length of the reaction screw column from the upper cover plate, and the other side of the reaction screw column is in contact with the base.

2. A hydraulic-mechanical composite support temporary beam adjustment device according to claim 1, characterized in that: A piston upper ball joint sliding block is arranged on the top of the piston of the jack, and the jack contacts the bottom surface of the upper cover plate through the piston upper ball joint sliding block.

3. The hydraulic-mechanical composite support temporary beam adjustment device according to claim 1, characterized in that: A force measuring device is arranged between the jack and the base.

4. The hydraulic-mechanical composite support temporary beam adjustment device according to claim 1, characterized in that: A reaction ball head is arranged on one side of the reaction screw column adjacent to the base.

5. A hydraulic-mechanical composite support temporary beam adjustment device according to claim 4, characterized in that: A base sliding block is arranged at the base position corresponding to the reaction ball head.

6. A hydraulic-mechanical composite support temporary beam adjustment device according to claim 1 or 4, characterized in that: The reaction force screw column is provided with a reaction force locking nut adjacent to one side of the upper cover plate.

7. The hydraulic-mechanical composite support temporary beam adjustment device according to claim 1, characterized in that: The upper cover plate has a cavity matching the reaction screw column, and the outer wall of the reaction screw column and the inner wall of the cavity form a threaded fitting connection.

8. The hydraulic-mechanical composite support temporary beam adjustment device according to claim 7, characterized in that: A side wall sliding block is arranged between the outer side wall of the cavity and the side wall of the jack.

9. The hydraulic-mechanical composite support temporary beam adjustment device according to claim 1, characterized in that: A plurality of sets of the hydraulic jacking devices and the mechanical reaction force devices are symmetrically arranged between the upper cover plate and the base, and the mechanical reaction force devices are arranged on the outside of the hydraulic jacking devices.

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