CN214301325U - Bracket pre-pressing mechanism - Google Patents
Bracket pre-pressing mechanism Download PDFInfo
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- CN214301325U CN214301325U CN202023323989.XU CN202023323989U CN214301325U CN 214301325 U CN214301325 U CN 214301325U CN 202023323989 U CN202023323989 U CN 202023323989U CN 214301325 U CN214301325 U CN 214301325U
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Abstract
The utility model relates to a bracket prepressing mechanism, which comprises at least one prepressing unit arranged along the length direction of a pier body, wherein the prepressing unit comprises a jack, a first reaction frame, a second reaction frame, a first supporting column and a second supporting column; the first supporting column is arranged at the top of the pier body, and the top of the first supporting column can be actively connected with the first reaction frame; the second supporting column is arranged on the other side of the top of the pier body, and the top of the second supporting column is movably connected with the second reaction frame; one end of the first reaction frame is movably connected with one end of the second reaction frame, and a movable connecting point formed between the first reaction frame and the second reaction frame is fixedly connected with the top of the jack; the bracket prepressing mechanism is simple in structure, convenient to install and disassemble, high in safety in the prepressing process, high in loading speed, short in construction period, capable of accurately grasping the magnitude and direction of the prepressing load and high in applicability.
Description
Technical Field
The utility model relates to a bridge construction technical field, concretely relates to bracket pre-pressing mechanism.
Background
The large-span continuous beam and the continuous rigid frame bridge are widely applied in the field of bridge engineering, in particular to the construction of high-grade highways in mountainous areas, and relate to a large number of high-pier large-span bridges. The construction of continuous beam bridge and continuous rigid frame high pier top 0# piece is the basis of later stage cantilever construction, and concrete square volume is all great generally, and the bracket that sets up for supporting 0# piece cast in situ concrete is crucial structure. The bracket is an important stress structure which is fixed on the upper part of the pier body to bear No. 0 block support, a template, concrete and construction load, in order to test the bearing capacity and stability of the whole bracket, eliminate the inelastic deformation of the bracket, measure the elastic deformation of the bracket to provide data basis for adjusting the elevation of the template, and carry out load prepressing on the bracket before the box girder concrete is formally poured to form a key link of cantilever construction.
At present, the pre-pressing mode of the bracket mainly comprises the following modes:
the first mode is as follows: the water is pumped into the bracket water tank for prepressing or the heavy object is placed for preloading. However, the pre-pressing load is large, the stacking area above the bracket is small, so that the pre-pressing water tank or the loading block is high in stacking and high in danger, and the distribution of the load and the balance of two sides are not easy to control.
The second mode is as follows: and pre-pressing by adopting a reaction frame and a plurality of large-tonnage jacks. However, because a large number of jacks need to be arranged, manual intervention is required continuously, the loading speed is slow, the construction period is long, and the load size and the load direction are difficult to accurately grasp; on the other hand, a plurality of jacks are arranged above the bracket, and large risks exist in installation and removal.
The third mode is as follows: and pre-pressing by combining a steel strand pre-buried in the bearing platform and a jack for tensioning and loading. However, under each level of load, after the steel strand is tensioned and anchored, the prestress loss is difficult to estimate accurately, and the control of the magnitude of the pre-pressed load is difficult; when the bearing platform is small or the cantilever of the bracket is large in length, the steel strand is inclined, so that the stress of the bracket is different from the actual stress state; when the pier body is higher, the method consumes more materials, is difficult to operate and has poor applicability.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the bracket prepressing mechanism is simple in structure, convenient to install and disassemble, high in safety in the prepressing process, high in loading speed, short in construction period, capable of accurately grasping the magnitude and direction of the prepressing load, high in applicability and convenient to popularize and apply widely.
In order to realize the purpose, the utility model discloses a technical scheme be:
a bracket prepressing mechanism is provided, brackets are arranged on two sides of the upper end of a pier body, a first distribution beam and a second distribution beam are respectively paved on the brackets on the two sides of the pier body along the length direction of the pier body, and the bracket prepressing mechanism comprises at least one prepressing unit arranged along the length direction of the pier body,
the pre-pressing unit comprises a jack, a first reaction frame, a second reaction frame, a first supporting column and a second supporting column;
the first support column is arranged on one side, close to a distribution beam, of the top of the pier body, the bottom of the first support column is fixedly connected with the top of the pier body, and the top of the first support column is movably connected with the first reaction frame; the second supporting columns are arranged on one sides, close to the distribution beams, of the tops of the pier bodies, the bottoms of the second supporting columns are fixedly connected with the tops of the pier bodies, and the tops of the second supporting columns are movably connected with the second reaction frame;
the jack is arranged between the first supporting column and the second supporting column, a base plate is arranged at the top of the jack, and the bottom of the jack is fixedly connected with the top surface of the pier body;
the first reaction frame is movably connected with the second reaction frame, and a movable connecting point formed between the first reaction frame and the second reaction frame is fixedly connected with the base plate; one end of the first reaction frame, which is far away from the jack, is connected with the first distribution beam, and one end of the second reaction frame, which is far away from the jack, is connected with the second distribution beam.
The utility model provides a bracket pre-compaction mechanism includes at least one pre-compaction unit that sets up along pier shaft length direction interval, and every pre-compaction unit includes a jack, first reaction frame, second reaction frame, first support column and second support column, and this bracket pre-compaction mechanism simple structure is convenient for install and dismantle. The safety is high in the prepressing process, the loading speed is high, the construction period is short, meanwhile, the magnitude and the direction of the prepressing load can be accurately grasped, the applicability is strong, and the wide popularization and application are facilitated.
Wherein, in the process of prepressing, after a jack applies force to a movable connection point formed between the first reaction frame and the second reaction frame, the first reaction frame and the second reaction frame correspondingly generate counter forces to two sides of a pier body, wherein, a movable link is formed between the first support column and the first reaction frame, the movable link point formed between the first support column and the first reaction frame can be used as a fulcrum of lever action, a movable link is formed between the second support column and the second reaction frame, the movable link formed between the second support column and the second reaction frame can be used as a fulcrum of lever action, the movable connection point formed between the first reaction frame and the second reaction frame is stressed and then respectively transmitted to a connection point of the first reaction frame and the first distribution beam and a connection point of the second reaction frame and the second distribution beam through lever action, and further transmits the counter forces to the first and second distribution beams and the respective lower brackets. Each prepressing unit only needs one jack, the defects that a plurality of jacks need to be continuously subjected to manual intervention and the loading speed is low and the construction period is long are avoided, and the prepressing mechanism is simple in structure, convenient to install and disassemble and high in safety. Meanwhile, the jack applies force, the corresponding first reaction frame and the second reaction frame form counter force to brackets at two ends of the pier body through leverage, a force transmission path is clear, the load size is easy to calculate, the balance and the directivity of pre-pressing load at two sides of the pier body can be effectively controlled, the operation is simple, and the applicability is strong.
As the utility model discloses a preferred scheme, the top of jack is provided with pressure sensor, pressure sensor's top is in backing plate fixed connection, the top surface of backing plate with first reaction frame the swing joint fixed connection who forms between the second reaction frame. The magnitude of the applied load can be accurately controlled through the pressure sensor, the magnitude and the direction of the pre-pressing load can be accurately grasped, the pre-pressing efficiency can be effectively improved, and the construction period is shortened.
As the preferred scheme of the utility model, pre-compaction unit sets up the top at the bracket.
As the utility model discloses a preferred scheme, the bracket prepressing mechanism includes two at least prepressing unit along pier shaft length direction interval setting. Such as 2 pre-pressing units, 3 pre-pressing units and 4 pre-pressing units. Further, the bracket prepressing mechanism comprises at least three prepressing units arranged at intervals along the length direction of the pier body, and the prepressing units are arranged at even intervals along the length direction of the pier body. Set up a plurality of pre-compaction units along pier shaft length direction evenly spaced, the point is applyed to the dispersed load, can effectively control the equilibrium and the directionality of the pre-compaction load of pier shaft both sides.
As a preferred scheme of the utility model, the bottom of the first supporting column is fixedly connected with the top of the pier body through a screw rod pre-embedded at the top of the pier body; and the bottom of the second support column is fixedly connected with the top of the pier body through a screw rod embedded at the top of the pier body.
As a preferred scheme of the utility model, the top of the first supporting column is hinged with the first reaction frame; the top of the second supporting column is hinged with the second reaction frame.
As the utility model discloses a preferred scheme, first reaction frame and second reaction frame are the triangle-shaped structure, the base of first reaction frame with the top fixed connection of first support column, the base of second reaction frame with the top fixed connection of second support column.
As the utility model discloses an optimal scheme, first reaction frame with the articulated connection of second reaction frame, first reaction frame the swing joint point that forms between the second reaction frame with the top of backing plate is through round pin axle fixed connection.
As a preferred scheme of the utility model, the first support column and the second support column are symmetrically arranged along the length direction of the pier body; the first support column and the second support column are equal in height.
As the preferred scheme of the utility model, first support column the second support column first reaction frame the second reaction frame with the jack is located the coplanar.
As the preferred scheme of the utility model, the jack arrives the distance of first support column with the jack arrives the distance of second support column equals.
As the utility model discloses an optimal scheme, the bottom of jack is through setting up the top surface fixed connection at the pre-buried steel sheet of pier shaft top surface and pier shaft, the bottom of pre-buried steel sheet is connected with the one end of anchor reinforcing bar, and the other end of anchor reinforcing bar stretches into inside the pier shaft. Furthermore, one end of the anchoring reinforcing steel bar extending into the pier body is connected with an anti-crack reinforcing steel bar net sheet.
As the utility model discloses a preferred scheme, first reaction frame is kept away from the one end of jack is connected with first distribution roof beam through first roof beam piece, the bottom of first roof beam piece with first distribution roof beam is connected, the top of first roof beam piece with first reaction frame is articulated to be connected. Furthermore, one end, far away from the jack, of the second reaction frame is connected with the second distribution beam through a second beam block, the bottom of the second beam block is connected with the second distribution beam, and the top of the second beam block is hinged with the second reaction frame.
As the preferred scheme of the utility model, the jack is hydraulic jack. Preferably, the jack is a large-tonnage hydraulic jack.
As a preferred embodiment of the present invention, the first distribution beam and the second distribution beam are i-beam distribution beams.
As a preferred embodiment of the present invention, a method for preloading a bracket by using a bracket preloading mechanism includes the steps of:
step 1, laying a first distribution beam and a second distribution beam on brackets on two sides of a pier body respectively along the length direction of the pier body, determining the position of at least one prepressing unit arranged at intervals along the length direction of the pier body, and installing the prepressing units;
and 3, when the load on the bracket reaches the total pre-pressing load capacity, keeping the pressure for a period of time, and turning off the oil hydraulic pump to finish pre-pressing the bracket.
The method for pre-pressing the pier body bracket has the advantages of being simple in operation, convenient to implement, high in safety, capable of effectively controlling the pre-pressing load parallelism of the two sides of the pier body, greatly reducing consumption of manpower and material resources, capable of achieving pre-pressing of pier body brackets with different heights and different site conditions, strong in applicability and convenient to popularize and apply.
Further, in step 1, the pre-pressing unit is mainly installed by the following method:
step S1, respectively installing a first supporting column and a second supporting column at the top of the pier body;
step S2, installing a first reaction frame on the first support column installed in the step S1, then installing a second reaction frame on the second support column installed in the step S1, and then movably connecting the first reaction frame and the second reaction frame;
step S3, a jack is installed, a base plate is installed on the top of the jack, and the hinge point of the first reaction frame and the hinge point of the second reaction frame are connected with the base plate through a pin shaft;
and step S4, connecting one end of the first reaction frame, which is far away from the jack, with the first distribution beam, and connecting one end of the second reaction frame, which is far away from the jack, with the second distribution beam, so as to finish the installation of the pre-pressing unit.
Further, in step S3, a pressure sensor is installed between the jack and the pad.
Furthermore, in the step 2, a jack in the pre-pressing unit is pressed at the same time, and correspondingly, the jack is used for pre-pressing the bracket.
Furthermore, in the step 3, the pressure holding time is 20-28 h.
Furthermore, in the step 3, the sedimentation amount of the bracket in the pressure maintaining process is not more than 3 mm.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the utility model provides a bracket pre-compaction mechanism includes at least one pre-compaction unit that sets up along pier shaft length direction interval, and every pre-compaction unit includes a jack, first reaction frame, second reaction frame, first support column and second support column, and this bracket pre-compaction mechanism simple structure is convenient for install and dismantle.
2. The bracket prepressing mechanism provided by the utility model is characterized in that after the jack applies force to the movable connection point formed between the first reaction frame and the second reaction frame, the first reaction frame and the second reaction frame correspondingly generate counter force to two sides of the pier body, wherein, the first supporting column and the first reaction frame are movably connected, the movable connection point formed between the first supporting column and the first reaction frame can be used as the fulcrum of leverage, the second supporting column and the second reaction frame are movably connected, the movable connection point formed between the second supporting column and the second reaction frame can be used as the fulcrum of leverage, the movable connection point formed between the first reaction frame and the second reaction frame is stressed and then respectively transmitted to the connection point of the first reaction frame and the first distribution beam through leverage, and the connecting point of the second reaction frame and the second distribution beam, and further transmitting the reaction force to the first distribution beam, the second distribution beam and the corresponding lower bracket. Each pre-pressing unit only needs one jack, the defects that a plurality of jacks need to be subjected to continuous manual intervention, the loading speed is low, the construction period is long, and the safety is high are avoided.
3. The utility model discloses an among the bracket prepressing mechanism, the jack exerts the afterburning, and corresponding first reaction frame and second reaction frame form the counter-force through leverage to the bracket at pier shaft both ends, and it is clear and definite to pass the power route, and the load size is calculated easily, can the equilibrium and the directionality of the pre-compaction load of effective control pier shaft both sides, easy operation, the suitability is strong.
4. Prepressing unit still includes pressure sensor, can accurate control the size of applying the load through pressure sensor, and the pre-compaction load size and direction can effectively improve pre-compaction efficiency, reduce construction cycle are held to the accuracy.
Drawings
Fig. 1 is a schematic view of a vertical plane layout structure of the bracket pre-pressing mechanism of the present invention.
Fig. 2 is a schematic top view of the bracket pre-pressing mechanism on the pier top.
Icon: 1-pier body; 2-a bracket; 21-a first distribution beam; 211-a first beam block; 22-second distribution beam; 221-a second beam block; 3-a jack; 31-a pressure sensor; 32-backing plate; 33-embedding a steel plate; 4-a first reaction frame; 5-a second reaction frame; 6-a first support column; 7-second support column.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
As shown in fig. 1 and 2, in the bracket pre-pressing mechanism, brackets 2 are arranged on two sides of the upper end of a pier body 1, a first distribution beam 21 and a second distribution beam 22 are respectively laid on the brackets 2 on two sides of the pier body 1 along the length direction of the pier body, and the first distribution beam 21 and the second distribution beam 22 are double-beam i-beam distribution beams. Including two pre-compaction units along 1 length direction interval setting of pier shaft, wherein pier shaft length direction is the direction that arrow A indicated in figure 2. The pre-pressing unit is located above the bracket 2.
As shown in fig. 1, the pre-pressing unit comprises a jack 3, a first reaction frame 5, a second reaction frame 6, a first supporting column 6 and a second supporting column 7; the first reaction frame 5 and the second reaction frame 6 are triangular structural members, and the jack 3 is a large-tonnage hydraulic jack;
the first support column 6 is arranged on one side, close to a distribution beam 21, of the top of the pier body 1, the bottom of the first support column 6 is fixedly connected with the top of the pier body 1 through a screw pre-embedded in the top of the pier body 1 through a bolt, and the top of the first support column 6 is hinged with the bottom edge of the first reaction frame 5; the second support columns 7 are arranged on one side, close to the distribution beams 22, of the top of the pier body 1, the bottoms of the second support columns 7 are fixedly connected with the top of the pier body 1 through bolts pre-embedded in the top of the pier body 1, the tops of the second support columns 7 are hinged to the bottom edge of the second reaction frame 6, and the first support columns 6 and the second support columns 7 are symmetrically arranged in parallel along the length direction of the pier body; the heights of the first supporting column 6 and the second supporting column 7 are equal;
the jack 3 is arranged between the first supporting column 6 and the second supporting column 7, and the distance from the jack 3 to the first supporting column 6 is equal to the distance from the jack 3 to the second supporting column 7. The first support column 6, the second support column 7, the first reaction frame 5, the second reaction frame 6 and the jack 3 are located in the same plane.
The top of jack 3 is connected with pressure transmission ware, and pressure sensor 31's top is connected with backing plate 32, the one end of first reaction frame 5 with the one end of second reaction frame 6 is articulated to be connected, first reaction frame 5 the hinge point that forms between the second reaction frame 6 passes through round pin axle fixed connection with backing plate 32 top. The bottom of jack 3 is through setting up the top surface fixed connection at the pre-buried steel sheet 33 of 1 top surfaces of pier shaft and pier shaft 1, the bottom of pre-buried steel sheet 33 is connected with the one end of anchor reinforcing bar, and the other end of anchor reinforcing bar stretches into 1 inside of pier shaft, and the anchor reinforcing bar stretches into 1 inside one end of pier shaft and is connected with anti-crack reinforcing bar net piece.
One end, far away from the jack 3, of the first reaction frame 5 is connected with a first distribution beam 21 through a first beam block 211, the bottom of the first beam block 211 is connected with the first distribution beam 21, and the top of the first beam block 211 is hinged with the first reaction frame 5; one end of the second reaction frame 6, which is far away from the jack 3, is connected with the second distribution beam 22 through a second beam block 221, the bottom of the second beam block 221 is connected with the second distribution beam 22, and the top of the second beam block 221 is hinged with the second reaction frame 6.
Above-mentioned 2 pre-compaction mechanisms of bracket include two pre-compaction units that set up along 1 length direction interval of pier shaft, and every pre-compaction unit includes a jack 3, first reaction frame 5, second reaction frame 6, first support column 6 and second support column 7, and this 2 pre-compaction devices of bracket simple structure is convenient for install and dismantle. The safety is high in the prepressing process, the loading speed is high, the construction period is short, meanwhile, the magnitude and the direction of the prepressing load can be accurately grasped, the applicability is strong, and the wide popularization and application are facilitated.
Example 2
A method for preloading a bracket using the bracket preloading mechanism of embodiment 1, comprising the steps of:
step 1, laying a first distribution beam 21 and a second distribution beam 22 on brackets 2 on two sides of a pier body 1 respectively along the length direction of the pier body, determining the positions of at least two pre-pressing units arranged at intervals along the length direction of the pier body, and installing the pre-pressing units, wherein the pre-pressing units are mainly installed by the following method: step S1, respectively installing a first supporting column 6 and a second supporting column 7 on the top of the pier body 1; step S2, installing a first reaction frame 5 on the first support column 6 installed in the step S1, then installing a second reaction frame 6 on the second support column 7 installed in the step S1, and then, hinging one end of the first reaction frame 5 with one end of the second reaction frame 6, wherein the hinging point of the second reaction frame 6 of the first reaction frame 5 is connected with the backing plate 32 through a pin shaft; step S3, a jack 3 is installed, a pressure sensor 31 is installed at the top of the jack 3, and the top of the pressure sensor 31 is connected with the base plate 32 of the step S2; and step S4, connecting one end of the first reaction frame 5, which is far away from the jack 3, with the first distribution beam 21, and connecting one end of the second reaction frame 6, which is far away from the jack 3, with the second distribution beam 22, so as to complete the installation of the pre-pressing unit.
and 3, when the load on the bracket 2 reaches the total preloading amount, keeping the pressure for 24h, wherein the settling volume of the bracket 2 in 24h is not more than 3mm, and turning off the oil pressure pump to complete the pre-compaction on the bracket 2.
In the prepressing process, after a jack applies force to a movable connection point formed between the first reaction frame and the second reaction frame, the first reaction frame and the second reaction frame correspondingly generate counter force to two sides of a pier body, wherein the first support column and the first reaction frame are movably linked, a movable link point formed between the first support column and the first reaction frame can be used as a fulcrum of leverage, a movable link is formed between the second support column and the second reaction frame and can be used as a fulcrum of leverage, the movable connection point formed between the first reaction frame and the second reaction frame is stressed and then is respectively transmitted to a connection point of the first reaction frame and the first distribution beam and a connection point of the second reaction frame and the second distribution beam through leverage, and further transmits the counter forces to the first and second distribution beams and the respective lower brackets. The method for pre-pressing the pier body bracket has the advantages of being simple in operation, convenient to implement, high in safety, capable of effectively controlling the pre-pressing load parallelism of the two sides of the pier body, greatly reducing consumption of manpower and material resources, capable of achieving pre-pressing of pier body brackets with different heights and different site conditions, strong in applicability and convenient to popularize and apply.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A bracket prepressing mechanism is characterized by comprising at least one prepressing unit arranged along the length direction of a pier body, wherein brackets (2) are arranged on two sides of the upper end of the pier body (1), a first distribution beam (21) and a second distribution beam (22) are respectively laid on the brackets (2) on the two sides of the pier body (1) along the length direction of the pier body,
the pre-pressing unit comprises a jack (3), a first reaction frame (4), a second reaction frame (5), a first supporting column (6) and a second supporting column (7);
the first supporting column (6) is arranged on one side, close to a distribution beam (21), of the top of the pier body (1), the bottom of the first supporting column (6) is fixedly connected with the top of the pier body (1), and the top of the first supporting column (6) is movably connected with the first reaction frame (4); the second supporting columns (7) are arranged on one sides, close to the distributing beams (22), of the tops of the pier bodies (1), the bottoms of the second supporting columns (7) are fixedly connected with the tops of the pier bodies (1), and the tops of the second supporting columns (7) are movably connected with the second reaction frame (5);
the jack (3) is arranged between the first supporting column (6) and the second supporting column (7), a base plate (32) is arranged at the top of the jack (3), and the bottom of the jack (3) is fixedly connected with the top surface of the pier body (1);
the first reaction frame (4) is movably connected with the second reaction frame (5), and a movable connecting point formed between the first reaction frame (4) and the second reaction frame (5) is fixedly connected with the backing plate (32); one end of the first reaction frame (4) far away from the jack (3) is connected with a first distribution beam (21), and one end of the second reaction frame (5) far away from the jack (3) is connected with a second distribution beam (22).
2. The bracket pre-pressing mechanism according to claim 1, characterized in that a pressure sensor (31) is arranged on the top of the jack (3), the top of the pressure sensor (31) is fixedly connected with a backing plate (32), and the top surface of the backing plate (32) is fixedly connected with a movable connection point formed between the first reaction frame (4) and the second reaction frame (5).
3. The bracket prepressing mechanism according to claim 1, wherein the bracket (2) prepressing mechanism comprises at least two prepressing units arranged at intervals along the length direction of the pier body.
4. The bracket prepressing mechanism according to claim 3, wherein the bracket (2) prepressing mechanism comprises at least three prepressing units arranged at intervals along the length direction of the pier body, and the prepressing units are arranged at even intervals along the length direction of the pier body.
5. A carriage preload mechanism as claimed in claim 1, wherein the top of said first support column (6) is hingedly connected to said first reaction frame (4); the top of the second supporting column (7) is hinged with the second reaction frame (5); the first reaction frame (4) is hinged with the second reaction frame (5), and a movable connecting point formed between the first reaction frame (4) and the second reaction frame (5) is fixedly connected with the top of the backing plate (32) through a pin shaft.
6. The bracket pre-pressing mechanism according to claim 1, wherein the first supporting column (6) and the second supporting column (7) are symmetrically arranged along the length direction of the pier body; the first supporting column (6) and the second supporting column (7) are equal in height.
7. A carriage preload mechanism as claimed in claim 1, wherein an end of said first reaction frame (4) remote from said jack (3) is connected to a first distribution beam (21) through a first beam block (211), a bottom of said first beam block (211) is connected to said first distribution beam (21), a top of said first beam block (211) is hingedly connected to said first reaction frame (4); one end, far away from the jack (3), of the second reaction frame (5) is connected with a second distribution beam (22) through a second beam block (221), the bottom of the second beam block (221) is connected with the second distribution beam (22), and the top of the second beam block (221) is hinged with the second reaction frame (5).
8. A carriage preload mechanism as claimed in any of claims 1 to 7, wherein said jack (3) is a hydraulic jack.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023323989.XU CN214301325U (en) | 2020-12-31 | 2020-12-31 | Bracket pre-pressing mechanism |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023323989.XU CN214301325U (en) | 2020-12-31 | 2020-12-31 | Bracket pre-pressing mechanism |
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| CN214301325U true CN214301325U (en) | 2021-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112681152A (en) * | 2020-12-31 | 2021-04-20 | 中铁二十三局集团第一工程有限公司 | Bracket prepressing mechanism and prepressing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112681152A (en) * | 2020-12-31 | 2021-04-20 | 中铁二十三局集团第一工程有限公司 | Bracket prepressing mechanism and prepressing method thereof |
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