A short pier 0# block pre-pressing mode support

Abstract

The utility model belongs to the field of building construction technology, especially a kind of low pier 0# block preloading mode support, including pier body, the upper end both sides of pier body are provided with triangular bracket structure, the upside of triangular bracket structure is provided with counterforce frame structure, and counterforce frame structure is provided with through core jack;The anchor connection assembly is pre-buried in the foundation of the lower end of pier body, the anchor connection assembly is connected with first finish rolling screw thread steel, and first finish rolling screw thread steel passes through counterforce frame structure and is connected with through core jack.For low pier 0# block preloading, the upper and lower sides are stably and reliably connected by first finish rolling screw thread steel, pressure is applied to counterforce frame structure by jack, instead of the mode of preloading test by piling, the whole counter-pressure mode construction is simple and deformation is controllable, and deformation deterioration can be promptly prevented by jack control.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and in particular relates to a support for the pre-stressing method of low pier 0# block. Background Technology

[0002] The most common structural form in the design of long-span bridges is the cantilever cast-in-place beam, and the most common method for cantilever cast-in-place beams is the hanging formwork cantilever casting method. The 0# block, as the first step in the construction of the bridge superstructure, provides a solid working surface for the hanging formwork construction, and its construction quality and safety are of paramount importance. Therefore, it is essential to test the strength, rigidity, and stability of the formwork system during the construction of the 0# block. In practice, it is common practice to test the stability of the formwork support system by pre-stressing before pouring the concrete for the 0# block to ensure that construction quality and safety are under control.

[0003] Traditional preloading methods typically employ surcharge loading, including water tank loading and sandbag (or precast block) loading. These methods require a large amount of material, and it's generally difficult to ensure sufficient load-bearing materials are available within a short timeframe, resulting in a long construction period. Furthermore, hoisting large loads at heights poses significant safety risks, often limiting the use of water tanks, sandbags, or precast blocks to achieve the required preloading load due to height restrictions. Utility Model Content

[0004] In view of the technical problems existing in the background art, this utility model provides a support for the pre-compression method of the low block 0# block.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: A pre-stressing support for a low pier (block #0) includes a pier body. Triangular bracket structures are respectively installed on both sides of the upper end of the pier body. A reaction frame structure is installed on the upper side of the triangular bracket structure, and a through-hole jack is installed on the reaction frame structure. An anchoring connection assembly is pre-embedded in the foundation at the lower end of the pier body. The anchoring connection assembly is connected to a first finely rolled threaded steel bar, which passes through the reaction frame structure and connects to the through-hole jack.

[0006] Optionally, the bottom end of the pier body is set on the bearing platform, and the anchoring connection component is pre-embedded in the bearing platform. The anchoring connection component includes a second fine-rolled threaded steel bar, and an anchoring steel pad and an anchoring nut are provided at the lower end of the second fine-rolled threaded steel bar. Spiral reinforcement is provided at the part of the second fine-rolled threaded steel bar embedded in the bearing platform, and several layers of steel mesh are provided between the spiral reinforcement and the anchoring steel pad.

[0007] Optionally, the spiral reinforcement is made of Φ10mm round steel bent into shape.

[0008] Optionally, the steel mesh is provided in two layers, with the top layer of steel mesh placed close to the bottom of the spiral reinforcement.

[0009] Optionally, the spiral reinforcement has a clear diameter of 10cm, a thread pitch of 12cm, and no less than 5 turns. The distance between the top surface of the spiral reinforcement and the top surface of the bearing platform is 20cm, and one spiral reinforcement is provided on each second precision-rolled threaded steel bar.

[0010] Optionally, two second fine-rolled threaded steel bars form a group, with the upper side of the second fine-rolled threaded steel bars in the same group connected to the spreader beam via a first nut, and the lower part of the first fine-rolled threaded steel bar passing through the spreader beam and connected to the spreader beam via a second nut.

[0011] Optionally, the spreader beam is composed of two I-beams welded together, with first gusset plates installed on the upper and lower top surfaces respectively.

[0012] This utility model has the following advantages and beneficial effects: In this invention, for the preloading of the No. 0 block of a low pier, typically with a height below 20m, a lower anchoring system is installed on the foundation side, and a reaction frame structure is installed on the upper side of the triangular bracket structure. A through-hole jack is used to reliably connect the upper and lower sides via a first precision-rolled threaded steel bar. Pressure is applied to the reaction frame structure by the jack, and the reaction force is then applied to the triangular bracket structure. This replaces the method of surcharge loading to achieve the preloading test. The entire reaction loading method is simple to construct and deformation is controllable; the jack control allows for timely prevention of deformation deterioration.

[0013] This invention is particularly suitable for low-profile structures, avoiding the difficulties in connecting multiple threaded steel bars required for high-profile structures. In high-profile structures, precision-rolled threaded steel bars are extended using connectors (sleeves), and under immense and repeated tensile forces, the connection points are highly susceptible to fracture or plastic deformation. Furthermore, with multiple sections connected, it is difficult to ensure the entire steel bar is perfectly straight; any slight bend or eccentricity will generate additional bending moments during tensioning, significantly increasing the risk of threaded steel bar fracture. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the cross-section of the 0# block support of the low pier in this utility model; Figure 2 This is a schematic longitudinal section of the support for the 0# block of the low pier in this utility model; Figure 3 for Figure 1 A magnified view of a portion of point a. Figure 4 for Figure 2 A magnified view of a section at point b in the middle; Figure 5 for Figure 2 A magnified view of a portion of the central structure.

[0015] Attached reference numerals: 1-Pile cap, 2-Pier body, 3-Triangular bracket structure, 31-Horizontal bracket, 32-Vertical bracket, 33-Diagonal bracket, 34-Pin, 35-Corner, 36-Second pair of tie rods, 37-Third pair of tie rods, 4-Unloading frame, 5-Bottom side support frame, 6-Upper side support frame, 61-Second connecting plate, 7-Through-core jack, 8-Second precision-rolled threaded steel bar, 81-Spiral reinforcement, 82-Anchoring steel pad, 83-Anchoring nut, 84-Reinforcing mesh, 85-First connecting plate, 86-First washer, 87-First nut, 88-Carrying beam, 9-First precision-rolled threaded steel bar, 91-Second washer, 92-Second nut, 93-Third washer, 94-Third nut. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] Example like Figures 1-5 As shown, a pre-stressing support for a low pier 0# block includes a pier body 2. Triangular bracket structures 3 are respectively provided on both sides of the upper end of the pier body 2. A reaction frame structure is provided on the upper side of the triangular bracket structure 3, and a through-hole jack 7 is provided on the reaction frame structure. An anchoring connection component is pre-embedded in the foundation at the lower end of the pier body 2. The anchoring connection component is connected to a first fine-rolled threaded steel bar 9. The first fine-rolled threaded steel bar 9 passes through the reaction frame structure and is connected to the through-hole jack 7.

[0019] In this invention, for the preloading of the 0# block of a low pier, typically with a height below 20m, a lower anchoring system is installed on the foundation side, and a reaction frame structure is installed on the upper side of the triangular bracket structure 3. A through-hole jack 7 is used, and the upper and lower sides are stably and reliably connected via a first precision-rolled threaded steel bar 9. Pressure is applied to the reaction frame structure by the jack, and the reaction force is applied to the triangular bracket structure 3. This replaces the method of surcharge loading to achieve the preloading test. The entire reaction loading method is simple to construct and deformation is controllable; the jack control can promptly prevent deformation deterioration.

[0020] like Figures 1-5As shown, in a preferred embodiment of this utility model, the bottom end of the pier body 2 is set on the pier cap 1, and the anchoring connection component is pre-embedded in the pier cap 1. The anchoring connection component includes a second fine-rolled threaded steel bar 8. During the construction of the pier cap 1, the second fine-rolled threaded steel bar 8 is embedded in the pier cap 1 as an anchoring point. Eight bars are embedded in the transverse direction of the bridge, four for each of the large and small mileage sections. The depth of embedment in the pier cap 1 is 120cm, and 84cm is exposed.

[0021] Furthermore, an anchoring steel plate 82 and an anchoring nut 83 are provided at the lower end of the second fine-rolled threaded steel bar 8 to achieve lower end anchoring. Spiral reinforcement 81 is provided at the part of the second fine-rolled threaded steel bar 8 embedded in the bearing platform 1, and several layers of steel mesh 84 are provided between the spiral reinforcement 81 and the anchoring steel plate 82.

[0022] Among them, the second fine-rolled threaded steel bar 8 embedded in the foundation 1 is provided with spiral ribs 81 to disperse stress. The spiral ribs 81 are made of Φ10mm round steel, with a net diameter of 10cm, a thread spacing of 12cm, and no less than 5 turns. The top surface of the spiral ribs 81 is 20cm away from the top surface of the foundation 1. One spiral rib 81 is provided on each second fine-rolled threaded steel bar 8.

[0023] The second fine-rolled threaded steel bar 8 embedded in the foundation 1 is provided with two layers of steel mesh 84 at its lower part to enhance the anchoring strength. The top layer of steel mesh 84 is set close to the bottom end of the spiral reinforcement 81. The mesh spacing is 50cm, and the mesh is welded with Φ20mm hot-rolled smooth round steel bars (HPB). The horizontal and vertical spacing is 10cm×10cm. The top layer of steel mesh is 50cm away from the top surface of the foundation 1. The horizontal reinforcement is 80cm long and the vertical reinforcement is 40cm long.

[0024] In this invention, two second fine-rolled threaded steel bars 8 form a group, meaning that every two second fine-rolled threaded steel bars 8 correspond to one first fine-rolled threaded steel bar 9. The upper side of the second fine-rolled threaded steel bars 8 in the same group is connected to the spreader beam 88 via a first nut 87. The lower part of the first fine-rolled threaded steel bar 9 passes through the spreader beam 88 and is connected to the spreader beam 88 via a second nut 92. The upper part of the first fine-rolled threaded steel bar 9 passes through the through-hole jack 7 and is connected via a third washer 93 and a third nut 94.

[0025] Furthermore, the spreader beam 88 is composed of two I-beams welded together, with first connecting plates 85 respectively installed on the upper and lower top surfaces. A first washer 86 is installed between the first connecting plate 85 and the first nut 87 for reinforcement connection, and a second washer 91 is installed between the first connecting plate 85 and the second nut 92 for reinforcement connection.

[0026] In this invention, the triangular bracket structure 3 includes a horizontal bracket 31, an oblique bracket 33, and a vertical bracket 32. Pre-drilled holes on the pier body 2 allow for the limiting installation of one side of the horizontal bracket 31 and the limiting installation of the bracket 35 on the lower side of the oblique bracket 33. The bracket 35 is positioned on the lower side of the oblique bracket 33 and is fixedly installed in the pre-drilled holes on the pier body 2. The horizontal bracket 31, oblique bracket 33, and vertical bracket 32 ​​are connected in a triangular shape by pins 34. The vertical bracket 32 ​​is positioned close to the pier body 2 for easy on-site assembly, avoiding on-site welding. Simultaneously, a second pair of tie rods 36 are pre-embedded inside the pier body 2 to connect the brackets 35 on both sides of the pier body, and a third pair of tie rods 37 are pre-embedded at the upper end of the pier body 2 to connect the horizontal brackets 31 on both sides of the pier body. The second pair of tie rods 36 are used to tighten and fix the corbels 35 on both sides of the pier body 2, and the third pair of tie rods 37 are used to tighten and fix the transverse brackets 31 on both sides of the pier body 2.

[0027] In this utility model, a reaction frame structure is provided on the upper side of the triangular bracket structure 3. The reaction frame structure includes a drop frame 4, a bottom support frame 5 and an upper support frame 6. The drop frame 4 is provided on the transverse bracket 31, the bottom support frame 5 is provided on the drop frame 4, and the upper support frame 6 is provided on the bottom support frame 5.

[0028] In this utility model, the lower part uses a pre-embedded second precision-rolled threaded steel bar 8 to hold the spreader beam 88 as an anchor point. The upper support frame 6 uses I-beams as a reaction frame. The hydraulic jack is a 200T through-hole jack 7 with a maximum stroke of 200mm. The lower spreader beam 88 is composed of two 5.0m long I25a I-beams welded together, with 2cm thick first connecting plates 85 on the upper and lower top surfaces. The upper support frame 6 is composed of two 3.0m long I-beams welded together, with 2cm thick second connecting plates 61 on the upper and lower top surfaces.

[0029] In this utility model, the anchoring connection is achieved by pre-embedding the second fine-rolled threaded steel bar 8 in the bearing platform 1. The entire counter-pressure method is simple to construct and the deformation is controllable. The deformation can be prevented from deteriorating in time by controlling it with jacks.

[0030] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A pre-stressing support for a low-profile pier (0# block), characterized in that: The pier includes a pier body, with triangular bracket structures on both sides of the upper end of the pier body, a reaction frame structure on the upper side of the triangular bracket structure, and a through-hole jack on the reaction frame structure; an anchoring connection component is pre-embedded in the foundation at the lower end of the pier body, and the anchoring connection component is connected to a first fine-rolled threaded steel bar, which passes through the reaction frame structure and is connected to the through-hole jack.

2. The pre-compression support for the low pier 0# block according to claim 1, characterized in that: The bottom of the pier body is set on the bearing platform, and the anchoring connection component is pre-embedded in the bearing platform. The anchoring connection component includes a second fine-rolled threaded steel bar. An anchoring steel pad and anchoring nut are provided at the lower end of the second fine-rolled threaded steel bar. Spiral reinforcement is provided at the part of the second fine-rolled threaded steel bar embedded in the bearing platform. Several layers of steel mesh are provided between the spiral reinforcement and the anchoring steel pad.

3. The pre-compression support for the low pier 0# block according to claim 2, characterized in that: The spiral reinforcement is made of Φ10mm round steel bent into shape.

4. The pre-compression support for the low pier 0# block according to claim 2, characterized in that: The steel mesh is provided in two layers, with the top layer of steel mesh placed close to the bottom of the spiral reinforcement.

5. The pre-compression support for the low pier 0# block according to claim 3, characterized in that: The spiral reinforcement has a clear diameter of 10cm, a thread pitch of 12cm, and no less than 5 turns. The top surface of the spiral reinforcement is 20cm away from the top surface of the foundation. One spiral reinforcement is provided on each second fine-rolled threaded steel bar.

6. The pre-stressing support for the low pier 0# block according to claim 2, characterized in that: Two second-grade threaded steel bars form a group. The upper side of the second-grade threaded steel bars in the same group is connected to the spreader beam through the first nut, and the lower part of the first-grade threaded steel bar passes through the spreader beam and is connected to the spreader beam through the second nut.

7. The pre-compression support for the low pier 0# block according to claim 6, characterized in that: The spreader beam is composed of two I-beams welded together, with first gusset plates installed on the upper and lower top surfaces respectively.

8. The pre-compression support for the low pier 0# block according to claim 1, characterized in that: The reaction frame structure includes a drop frame, a bottom support frame, and an upper support frame. The drop frame is mounted on a transverse bracket, the bottom support frame is mounted on the drop frame, and the upper support frame is mounted on the bottom support frame.

9. The pre-compression support for the low pier 0# block according to claim 1, characterized in that: The triangular bracket structure includes a horizontal bracket, an oblique bracket, and a vertical bracket. One side of the horizontal bracket is fixedly installed in a reserved hole in the pier body. A corbel is provided on the lower side of the oblique bracket, and the corbel is fixedly installed in a reserved hole in the pier body. The horizontal bracket, oblique bracket, and vertical bracket are connected by a pin, and the vertical bracket is set close to the pier body.

10. The pre-compression support for the low pier 0# block according to claim 9, characterized in that: The pier body is equipped with a second pair of tie rods and a third pair of tie rods. The second pair of tie rods is used to tighten and fix the corbels on both sides of the pier body, and the third pair of tie rods is used to tighten and fix the transverse brackets on both sides of the pier body.

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