Synchronous lifting system and method for multi-pier construction platform

Abstract

The present invention relates to the field of integrated column and tie-beam construction. Disclosed are a synchronous lifting system and method for a multi-pier construction platform. The system comprises several tie-beam support mechanisms, a pier formwork mechanism, and a climbing control system. The tie-beam support mechanisms connect adjacent pier formwork mechanisms, each of which includes a lifting frame equipped with several lifting jacks. Also disclosed is a synchronous lifting method for a multi-pier construction platform, comprising the following steps: first, adjusting a displacement sensor to an initial state; second, simultaneously driving all lifting jacks to climb on support rods, thereby driving the lifting frame and pier formwork mechanism to climb. The displacement sensor transmits the measured climbing distance of the lifting jacks to a controller, which controls the lifting jacks based on the displacement sensor data to ensure that each lifting jack has an equal displacement. This method mitigates the risk of re-erecting the tie-beam formwork support mechanisms and ensures that all pier formworks are lifted synchronously during multi-pier construction.

Description

Technical Field

[0001] The present invention relates to the field of column-tie-beam integrated construction, and in particular to a synchronous lifting system and method for a multi-pier column construction platform. Background Art

[0002] During high pier slipform construction, multiple piers are typically installed along the width of the bridge under the same cap beam. Tie beams connect the piers, and the tie beam casting section, consisting of the piers and tie beams within the tie beam elevation range, is typically cast together. Before casting this tie beam section, supports are required. If floor-mounted supports are used, the higher the piers, the greater the project workload, the higher the risk factor, and the more difficult it is to control construction costs. To this end, a common practice is to embed through-hole rods in the main piers, and then separately construct tie beam supports (tie beam formwork support mechanisms) on the through-hole rods to facilitate tie beam formwork construction.

[0003] However, on the one hand, re-erecting the tie beam support mechanism at high altitude is not only dangerous, but also time-consuming and labor-intensive; on the other hand, the lifting speed of each pier formwork mechanism cannot be guaranteed to be consistent, and the level of the erected tie beam formwork support mechanism cannot be guaranteed when it is lifted to the tie beam casting section. How to ensure that all pier formwork mechanisms are lifted synchronously during the construction of multiple piers has become a top priority at the construction site. Summary of the Invention

[0004] The present invention aims to provide a synchronous lifting system and method for a multi-pier construction platform, which solves the dangerous problem of re-erecting the tie beam formwork support mechanism in the background technology and ensures that all pier formwork mechanisms are lifted synchronously during multi-pier construction.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a synchronous lifting system and method for a multi-pier construction platform, comprising a plurality of tie beam support mechanisms, a pier formwork mechanism and a climbing control system, wherein the tie beam support mechanisms connect adjacent pier formwork mechanisms, and the pier formwork mechanisms each include a lifting frame, on which a plurality of lifting jacks are provided, vertical support rods are pre-embedded on the cast sections of the piers, the upper ends of the support rods are connected to the lifting jacks, and the oil circuit of each lifting jack is individually controlled, and the climbing control system includes a controller and a plurality of displacement sensors, wherein the displacement sensors are respectively arranged on each lifting jack, and the displacement sensors can measure the distance that the lifting jack climbs on the support rods, and the displacement sensors are connected to the controller, and the displacement sensors transmit the measured distance signals to the controller, and the controller adjusts each lifting jack so that the distance signals of all displacement sensors are the same.

[0006] The beneficial effects of this program are:

[0007] 1. Connect the tie beam support mechanism to the adjacent pier formwork mechanism on the ground so that the tie beam support mechanism and the pier formwork mechanism can be lifted together, thus avoiding the danger of re-erecting the tie beam formwork support mechanism at high altitude.

[0008] 2. Because the tie beam support mechanism and the pier formwork mechanism are lifted together, the lifting of each pier formwork mechanism must be synchronized. Otherwise, deformation of the tie beam support mechanism may occur, thereby reducing the bearing capacity of the entire structure. Therefore, this solution provides a climbing frame control system to ensure the synchronous lifting of each pier formwork mechanism.

[0009] Specifically, since the weight of each position of the pier formwork mechanism is different, the climbing distance is different when the power of the lifting jack is the same. Therefore, in this solution, the oil circuit of each lifting jack is controlled separately to meet the kinetic energy requirements of different lifting jacks; the climbing distance of each lifting jack on the support rod is measured by a displacement sensor, and the displacement of the lifting jack is timely debugged through the controller to prevent deformation of the tie beam support mechanism between the pier formwork mechanism.

[0010] Furthermore, the climbing control system also includes a horizontal attitude sensor, which is installed on the lifting frame and connected to the controller. The horizontal attitude sensor uses the horizontal plane as the initial plane. When the angle between the lifting frame and the horizontal plane exceeds the set angle value, the controller controls all lifting jacks to stop climbing. With this configuration, if there is a deviation in the displacement sensor, the deviation value is fixed. After multiple climbs, the deviation accumulates and becomes larger, and the horizontal attitude sensor detects that the lifting frame has tilted. The controller calculates and displays the additional stroke required for each jack based on the inclination angle measured by the horizontal attitude sensor and the distance between the lifting jacks, so that the lifting frame can be adjusted to the level in a timely manner.

[0011] Furthermore, it also includes a tie beam formwork mechanism, and each pier formwork mechanism includes a support frame and a tie rod, the support frame is connected to the cast section of the pier, an adjustment unit is provided on the support frame, and the upper end of the tie rod is connected to the adjustment unit;

[0012] The tie beam support mechanism includes several cantilever beams and distribution brackets. The cantilever beams are respectively arranged on both sides of the pier. The two ends of the cantilever beams are respectively connected to the lower ends of the tie rods of the template mechanisms of two adjacent piers. The adjustment unit can drive the cantilever beams to move.

[0013] In the initial state, the distribution bracket is supported on the cantilever beam between two adjacent piers, and the tie beam formwork mechanism is supported on the distribution bracket. The two sides of the distribution bracket are the rotating side and the free side respectively. The rotating side is rotatably connected to the cantilever beam on one side of the pier, and the free side is detachably connected to the cantilever beam on the other side; the free side is disconnected from the cantilever beam on the other side, and the adjustment unit drives the cantilever beam on that side to move. The distribution bracket loses the support of the cantilever beam on that side, and the free side rotates under the action of gravity until the distribution bracket is vertical.

[0014] The implementation steps of this plan are:

[0015] 1. Pre-embed the support frame on the upper surface of the cast section of the pier below the tie beam casting section. Install the adjustment unit on the support frame. Connect the adjustment unit, tie rod, cantilever beam and distribution bracket in sequence. Support the tie beam formwork mechanism on the distribution bracket and cast the tie beam casting section.

[0016] 2. Remove the part of the tie beam formwork mechanism except the tie beam bottom formwork, disconnect the free side from the cantilever beam on that side, drive the adjustment unit, and the adjustment unit drives the cantilever beam on that side to move, so that the free side of the distribution bracket loses the support of the cantilever beam on that side. Under the action of gravity, the free side rotates until the distribution bracket is vertical.

[0017] The beneficial effects of this program are:

[0018] 1. The erection of the tie beam support mechanism is an aerial operation. In order to support the distribution bracket, it is necessary to support the distribution bracket by setting a cantilever beam. In order to ensure the supporting effect, the cantilever beam needs to be set below the distribution bracket. However, if it is set up like this, when the distribution bracket rotates, the cantilever beam will definitely hinder the rotation of the distribution bracket. In this solution, an adjustment unit is set to drive the cantilever beam to move, so as to avoid the cantilever beam hindering the rotation of the distribution bracket.

[0019] 2. When the distribution bracket rotates, there is no need for manual operation standing next to the tie beam. By driving the adjustment unit, the distribution bracket can be rotated under the action of gravity. This is convenient and fast, and improves construction efficiency and production safety.

[0020] 3. There is no need to remove the bracket. After the distribution bracket is rotated, it is no longer at the bottom of the tie beam, but on the side of the tie beam. Therefore, when the pier formwork drives the distribution bracket to rise, it will not interfere with the cast tie beam.

[0021] Furthermore, the adjustment unit is an adjustment jack, connected to the upper end of the pull rod, which can drive the pull rod up or down. This arrangement allows the adjustment jack to lower the pull rod and the cantilever beam, thereby removing the support of the cantilever beam on the free side of the distribution bracket, allowing the distribution bracket to rotate to a vertical position.

[0022] Furthermore, the free side of the distribution bracket protrudes relative to the side of the corresponding cantilever beam, allowing it to connect to a steel cable. By actuating an adjustment jack near the free side of the distribution bracket, the cantilever beam and the free side of the distribution bracket move downward, tilting the distribution bracket. This allows the steel cable to sequentially pass around the side of the tie beam near the rotational side, the underside of the tie beam, and connect to the free side of the distribution bracket. With this arrangement, after the tie beam casting section is cast, the steel cable and adjustment jack are used in conjunction to reduce the rotation speed of the distribution bracket.

[0023] Specifically:

[0024] First, drive the adjustment jack on the free side of the distribution bracket to move the pull rod and the cantilever beam downward, and then drive the free side of the distribution bracket to rotate downward until the free side of the distribution bracket is flush with the side of the cantilever beam, that is, the free side of the distribution bracket no longer protrudes backward relative to the rear cantilever beam. At this time, the cantilever beam still supports the distribution bracket, and the distribution bracket is in an inclined state due to the rotation, that is, a gap is created between the distribution bracket and the bottom of the cast tie beam. At this time, fix the upper end of the steel cable on an object such as the side form of the pier, and the worker stands on the side close to the rotating side of the distribution bracket, places a part of the steel cable in the gap between the distribution bracket and the bottom of the cast tie beam, and uses a rod-shaped object such as a steel bar to push the lower end of the steel cable from the free side of the distribution bracket to the rotating side of the distribution bracket. Then another worker catches the lower end of the steel cable on the free side of the distribution bracket and hooks the lower end of the steel cable to the free side of the distribution bracket.

[0025] If the steel cable is not passed from the rotating side of the distribution bracket to the free side, but is directly connected to the free side of the distribution bracket, then after the distribution bracket rotates, since the upper end of the steel cable and the distribution bracket are on both sides of the tie beam, and at the same time, the lower end of the steel cable is connected to the distribution bracket, when the pier formwork mechanism drives the tie beam support structure to rise, the steel cable will still interfere with the tie beam, thereby preventing the tie beam support structure from rising.

[0026] Then, continue to drive the adjustment jack on the free side of the distribution bracket to make the cantilever beam continue to move downward until the cantilever beam can no longer support the free side of the distribution bracket. At the same time, the worker pulls the steel cable and slowly lowers the free end of the distribution bracket to prevent the distribution bracket from being damaged due to excessive rotation speed.

[0027] Finally, the pier formwork mechanism drives the tie beam support mechanism to slide upward. During the entire upward sliding process of the pier formwork mechanism, the upper end of the steel cable is always fixed on any structure above the cantilever beam to facilitate reaching the second tie beam casting section, driving the steel cable upward to retract and rotate the distribution bracket to a horizontal position. Otherwise, there is no other simple and safe way to rotate the distribution bracket to a horizontal position. At this time, the second tie beam has not yet been cast and formed. When the steel cable is pulled, neither the steel cable nor the distribution bracket will interfere with the tie beam.

[0028] Furthermore, the tie beam formwork mechanism includes a tie beam bottom formwork and two tie beam side forms. The tie beam bottom formwork is horizontally connected to the distribution bracket. The two tie beam side forms are respectively arranged on both sides of the tie beam. A corner sealing formwork is provided between the two tie beam side forms. The corner sealing formwork fills the space between one end of the bottom of the tie beam and the pier column. The tie beam bottom formwork is rotatably connected to one of the tie beam side forms. The tie beam side formwork is a rotating tie beam side formwork, and the other tie beam side formwork is a detachable tie beam side formwork. After the corner sealing formwork is removed, a strip gap is formed between the tie beam bottom formwork, the rotating tie beam side formwork, and the pier column. The end of the steel cable passes through the strip gap, the lower side of the tie beam, and is connected to the free side of the distribution bracket in sequence. This arrangement has the following effects:

[0029] After pouring the tie beam section, the tie beam side formwork and the corner sealing formwork are removed first. There is a gap between the tie beam bottom formwork and the pier column. The rotating pull rod drives the cantilever beam downward, so that the distribution bracket and the tie beam bottom formwork are tilted due to the rotation, so that the tie beam and the rotating tie beam side formwork are demoulded, and the rotating tie beam side formwork is leaning against the side of the tie beam; then, the rotating pull rod continues to drive the cantilever beam downward, so that the distribution bracket rotates to vertical; finally, the pier formwork mechanism drives the distribution bracket, the tie beam bottom formwork and the rotating tie beam side formwork to rise together. The rotating tie beam side formwork loses the support of the tie beam and, under the action of gravity, rotates around the tie beam bottom formwork connection position and collides with the tie beam bottom formwork. In the process of rising, under the action of wind load, it continuously collides with the tie beam bottom formwork, so that the concrete and other impurities remaining in the rotating tie beam side formwork and the tie beam bottom formwork are shaken off, so as to improve the concrete appearance quality of the tie beam during the next tie beam pouring.

[0030] The present invention aims to provide a synchronous lifting system and method for a multi-pier construction platform, so as to ensure that all pier formwork mechanisms are lifted synchronously during multi-pier construction.

[0031] To achieve the above object, the present invention adopts the following technical solution: a lifting method for a synchronous lifting system of a multi-pillar construction platform, comprising the following steps:

[0032] Step 1: Adjust the displacement sensor to the initial state;

[0033] Step 2: Simultaneously drive all lifting jacks to climb on the support rods, thereby driving the lifting frame and the pier formwork mechanism to climb. The displacement sensor transmits the measured climbing distance of the lifting jack to the controller. The controller controls the lifting jacks according to the data of the displacement sensor to ensure that the displacement of each lifting jack is equal;

[0034] Step 3. After the lifting jacks have climbed several times, when the angle between the lifting frame and the horizontal plane exceeds the angle setting value, the controller controls all the lifting jacks to stop climbing together. The controller calculates and displays the amount of stroke that needs to be added for each jack based on the inclination angle and the distance of the lifting jacks measured by the horizontal attitude sensor, so as to adjust the first channel steel unit and the second channel steel unit to the horizontal: the controller controls each lifting jack to climb individually until the lifting frame is parallel to the horizontal plane, adjusts all displacement sensors to the initial state, and repeats step 2.

[0035] The beneficial effects of this program are:

[0036] 1. The displacement sensor ensures that each lifting jack climbs the same distance, thereby making the entire system rise smoothly.

[0037] 2. Ensure the lifting frame is level through the horizontal attitude sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1This is a schematic diagram of the oil circuit of the lifting jack of Example 1;

[0039] Figure 2 This is the overall three-dimensional axonometric drawing of Example 1;

[0040] Figure 3 This is a three-dimensional axonometric drawing of the pier formwork mechanism of Example 1;

[0041] Figure 4 This is a three-dimensional axonometric drawing of the bridge pier formwork mechanism and the tie beam support mechanism in the tie beam casting section of Example 1;

[0042] Figure 5 This is a three-dimensional axonometric drawing of the support frame and the lifting frame in the tie beam casting section of Example 1;

[0043] Figure 6 3D axonometric drawing of the tie beam support mechanism of Example 1 in the initial state;

[0044] Figure 7 A three-dimensional axonometric diagram of the tie beam support mechanism of Example 1 after the distribution bracket is rotated to a vertical position;

[0045] Figure 8 A three-dimensional axonometric drawing of the position limiting member of Example 1;

[0046] Figure 9 This is a three-dimensional axonometric drawing of the upper hanging point support of Example 1;

[0047] Figure 10 A three-dimensional axonometric drawing of the pier formwork mechanism and the tie beam formwork mechanism in Example 1 at the tie beam casting section;

[0048] Figure 11 A three-dimensional axonometric drawing of the support conversion unit of Example 1;

[0049] Figure 12 This is a schematic diagram of the tie beam bottom formwork, bridge piers, steel cables, and rods for pushing the steel cables, viewed from above, when the distribution bracket is in an inclined state in step 4 of the specific implementation method of Example 1;

[0050] Figure 13 This is a schematic diagram of the distribution bracket being in an inclined state from the main perspective in the width direction of the bridge in step 4 of the specific implementation method of Example 1. DETAILED DESCRIPTION

[0051] The following is further described in detail through specific implementation methods:

[0052] The reference numerals in the drawings of the specification include: pier formwork mechanism 1, pier side formwork 11, detachable side formwork 111, non-detachable side formwork 112, support frame 12, column 121, crossbeam 122, tie rod 123, adjustment jack 124, lifting frame 13, first channel steel unit 131, second channel steel unit 132, platform connector 133, side formwork connector 134, side formwork tie rod 135, lifting jack 136, support rod 137, support conversion unit 14, hanging rod 141, rectangular plate 142, nut 143, tie beam bottom formwork 21, tie beam side formwork 22, corner seal Sealing template 23, limiting plate 31, limiting member 32, limiting rod 321, limiting portion 322, cantilever beam 33, distribution bracket 34, pull ring 341, main beam 342, secondary beam 343, rotating assembly 35, rotating shaft 351, first ear plate 352, second ear plate 353, ear plate 36, cylinder 361, limiting ring 37, pier 4, tie beam body 5, steel cable 610, rod-shaped object 620, strip gap 630, installation platform 7, upper hanging point support 710, controller 810, displacement sensor 820, horizontal attitude sensor 830, oil tank 840, solenoid valve 850.

[0053] Example 1

[0054] Example 1 is basically as Figure 1-13 As shown: a synchronous lifting system for a multi-pier construction platform, including a pier formwork mechanism 1, a tie beam support mechanism, a tie beam formwork mechanism, a climbing control system and an installation platform 7. Figure 3 As shown, the pier template mechanism 1 has three, such as Figure 2 As shown, the installation platform 7 surrounds three pier formwork mechanisms 1 at the same time, as shown in FIG. Figure 4 As shown, there are two tie beam formwork mechanisms and two tie beam support mechanisms, each of which is detachably mounted between two adjacent pier formworks. This embodiment 1 is applicable to square pier columns 4. The pier formwork mechanism 1 is a sliding formwork mechanism. Both the pier formwork mechanism 1 and the tie beam formwork mechanism are reinforced using existing technologies such as back ribs and bolts.

[0055] a. Installation platform 7

[0056] The installation platform 7 is provided with an upper hanging point support 710, such as Figure 9 As shown, the upper hanging point support 710 is a triangular bracket formed by welding rectangular tubes, and the right side of the upper hanging point support 710 is welded to the inner side of the installation platform 7.

[0057] b. Pier formwork mechanism 1. Climbing control system

[0058] Each pier formwork mechanism 1 includes a side formwork unit, a support frame 12 and a lifting frame 13. Figure 3As shown, the side formwork unit includes four pier side forms 11 that can enclose the pier 4. The pier side formwork 11 between adjacent piers 4 is a detachable side formwork 111, and the other three pier side formworks 11 are non-detachable side formworks 112. The detachable side formwork 111 and the non-detachable side formwork 112 are detachably connected, with the vertical axis of the pier 4 as the center of the pier 4, and the side close to the center of the pier 4 as the inner side.

[0059] like Figure 9 As shown, the support frame 12 includes a crossbeam 122, two columns 121 and four tie rods 123. The columns 121 are all pre-buried on the upper surface of the cast section of the pier below the tie beam casting section, as shown in FIG. Figure 4 As shown, the upper ends of the columns 121 are higher than the highest point of the pier side form 11, and the crossbeams 122 are arranged horizontally along the length direction of the bridge ( Figure 4 anteroposterior direction), such as Figure 9 As shown, the crossbeam 122 is formed by welding two back-to-back and parallel channel steels, and the middle of the crossbeam 122 is bolted to the top of the column 121, as shown in FIG. Figure 4 As shown, both ends of the crossbeam 122 extend to the outside of the pier side form 11, and four tie rods 123 are vertically arranged in pairs at the front and rear sides of the pier column 4, as shown in FIG. Figure 9 As shown, the crossbeam 122 is provided with an adjustment unit, which includes four adjustment jacks 124. The four adjustment jacks 124 are respectively provided with bolts at both ends of the crossbeam 122. The adjustment jacks 124 are all through-type jacks. The upper end of the pull rod 123 passes through the crossbeam 122 and the adjustment jack 124. The adjustment jack 124 can drive the pull rod 123 to rise or fall. For the convenience of display, all the jacks in this embodiment 1 are only Figure 5 Displayed in.

[0060] like Figure 9As shown, the lifting frame 13 is arranged above the cast section of the pier 4, and includes a first channel steel unit 131 and a second channel steel unit 132 arranged horizontally perpendicular to each other. The first channel steel unit 131 is arranged along the width direction of the bridge. The first channel steel unit 131 and the second channel steel unit 132 each include two groups of connecting parts and two back-to-back and parallel channel steels. The two groups of connecting parts are respectively arranged on the channel steel in two opposite directions relative to the center of the pier 4. The two groups of connecting parts include a platform connecting part 133, a side form connecting part 134 and a lifting part from the outside to the inside. The platform connector 133 is welded to the upper surface of the mounting platform 7. The platform connector 133 is clamped between the two channel steels and bolted to the two channel steels. The side form connector 134 is a rectangular rod, which is welded vertically and horizontally on the two channel steels. A vertical side form pull rod 135 is provided at each end of the side form connector 134. The lower end of the side form pull rod 135 passes through the side form connector 134 and is bolted to the upper surface of the side form. The lifting part includes a lifting jack 136 and a support rod 137. The lifting jack 136 is bolted to the two channel steels. The lifting jack 136 is also a through-type jack. The upper end of the support rod 137 is connected to the lifting jack 136. The lower end of the support rod 137 is pre-buried in the poured section of the pier and increases section by section as the lifting frame 13 rises. The oil circuit of the lifting jack 136 is as follows Figure 1 As shown, each lifting jack 136 has a separate oil circuit and is provided with an oil tank 840 . All oil circuits are connected to the oil tank 840 , and each oil circuit is provided with a solenoid valve 850 .

[0061] The first channel steel unit 131 is further provided with a support conversion unit 14, which is arranged inside the lifting member. Figure 11 As shown, the support conversion unit 14 includes two hanging rods 141 and three rectangular plates 142. The two hanging rods 141 are both inverted U-shaped rods that have been bent 90° twice. The two hanging rods 141 are hung on two channel steels at the same time. The hanging rods 141 are provided with threads and several nuts 143. The four ends of the two hanging rods 141 pass through the four corners of the rectangular plates 142 respectively. After tightening the nuts 143, the uppermost rectangular plate 142 and the hanging rod 141 can clamp the two channel steels, and the remaining two rectangular plates 142 clamp the crossbeam 122.

[0062] The climbing control system includes a controller 810, a displacement sensor 820 and a horizontal attitude sensor 830. The displacement sensor 820 includes a signal transmitter and a receiver. Figure 5As shown, the transmitter is bolted to the lifting jack 136, and the receiver is bolted to the support rod 137. The receiver is installed at the same height through a level. The receiver is set directly below the transmitter. The transmitter can send infrared rays and sound waves to the receiver. The receiver calculates and displays the distance between the receiver and the transmitter through the propagation speed of the infrared rays and sound waves and the time difference when they reach the receiver, and transmits the value of the distance to the controller 810. The controller 810 is set on the oil tank 840. The displacement sensor 820 transmits the measured climbing distance of the lifting jack 136 to the controller 810. The controller 810 controls the lifting jack 136 according to the data of the displacement sensor 820 to ensure that the displacement of each lifting jack 136 is equal.

[0063] The controller 810 is electrically connected to the controller 810, solenoid valve 850, displacement sensor 820, and horizontal attitude sensor 830 on the oil circuit. The controller 810 is mounted on the oil tank 840, and the horizontal attitude sensor 830 is mounted at the vertical foot of the first channel steel unit 131 and the second channel steel unit 132. The horizontal attitude sensor 830 uses the horizontal plane as the initial plane and transmits the measured inclination angle to the controller 810. When the inclination angle exceeds the set angle value, the controller 810 calculates and displays the amount of stroke required for each jack based on the inclination angle measured by the horizontal attitude sensor 830 and the distance between the lifting jacks 136. The controller 810 then controls all lifting jacks 136 to stop climbing. In this embodiment, the angle setting value is 2°.

[0064] c. Tie beam support mechanism

[0065] like Figure 4 、 Figure 6 and Figure 7 As shown, the tie beam support mechanism includes four cantilever beams 33, a distribution bracket 34, a steel cable 610 and a limiter 32, as shown in FIG. Figure 4 As shown, the two ends of the cantilever beam 33 are respectively connected to the lower ends of the tie rods 123 on different piers 4 by threads. The cantilever beam 33 is an I-beam. Four cantilever beams 33 are respectively arranged horizontally on the front and rear sides of the pier 4 and are arranged along the width direction of the bridge ( Figure 4 left and right directions).

[0066] Figure 4 The details of the distribution bracket 34 are not shown. Figure 6 and Figure 7 As shown, the distribution bracket 34 is set on the cantilever beam 33 between two adjacent piers 4, as shown in FIG. Figure 6As shown, the distribution bracket 34 includes two parallel main beams 342, both of which are supported on the top of the cantilever beam 33, and a number of parallel secondary beams 343 are welded between the two main beams 342. The rear main beam 342 is the rotating side of the distribution bracket 34, and a rotating assembly 35 is provided between the rear cantilever beam 33. The rotating assembly 35 includes a rotating shaft 351, a first ear plate 352 and a second ear plate 353. The first ear plate 352 is welded to the secondary beam 343, and the second ear plate 353 is welded to the cantilever beam 3 3, the rotating shaft 351 passes through the first ear plate 352 and the second ear plate 353 at the same time, and is rotatably connected to the first ear plate 352 and the second ear plate 353; the tie beam template mechanism is supported on the secondary beam 343, the front main beam 342 is the free side of the distribution bracket 34, and is bolted to the front cantilever beam 33, the front main beam 342 protrudes forward relative to the front cantilever beam 33, and a pull ring 341 is welded on the front side of the front main beam 342, which can be hung with the hook at the lower end of the steel cable 610.

[0067] like Figure 7 As shown, Figure 7 Zhongwei Figure 6 The locking device after the distribution bracket 34 is rotated, Figure 7 The cantilever beam 33 is Figure 6 The cantilever beam 33 at the middle and rear side has a horizontal ear plate 36 welded to its front side. The ear plate 36 is located on the left side of the main beam 342. A first limiting hole is provided on the ear plate 36. A cylinder 361 is integrally formed on the upper side of the ear plate 36. An internal thread is provided on the inner side of the cylinder 361. Figure 7 (not shown), the cylinder 361 is coaxial with the first limiting hole, the inner diameter of the cylinder 361 is larger than the diameter of the first limiting hole, and two limiting rings 37 and a limiting plate 31 are horizontally welded from top to bottom on the left side of the leftmost secondary beam 343 of the distribution bracket 34. The two limiting rings 37 are each provided with a second limiting hole running vertically therethrough, and a circular limiting groove is provided on the upper surface of the limiting plate 31. The first limiting hole, the second limiting hole and the limiting groove are coaxial and have the same diameter; as shown in FIG. Figure 7 and Figure 8 As shown, the limiting member 32 includes a limiting rod 321 and a limiting portion 322 integrally formed at the upper end of the limiting rod 321. The limiting portion 322 is cylindrical and has a diameter larger than the diameter of the limiting rod 321 and the first limiting hole. The side of the limiting portion 322 is provided with an external thread, and is engaged with the inner thread of the cylinder 361 of the ear plate 36. The limiting rod 321 passes through the cylinder 361, the first limiting hole and the second limiting hole in sequence, so that the lower end of the limiting rod 321 is inserted into and pressed against the limiting groove, and the limiting portion 322 and the cylinder 361 are threadedly connected.

[0068] Figure 7 The ear plate 36, the limiting ring 37, the limiting groove and the limiting member 32 and other components can be arranged not only on the left side of the distribution bracket 34, but also on the right side of the distribution bracket 34 according to the situation.

[0069] d. Tie beam formwork mechanism

[0070] like Figure 10 As shown, the tie beam template mechanism includes a tie beam bottom form 21 and two tie beam side forms 22. The tie beam bottom form 21 is horizontally bolted to the bottom of the tie beam 21. Figure 4 As shown in the distribution bracket 34, Figure 10 As shown, two tie beam side forms 22 are respectively provided on both sides of the tie beam body 5, and a corner sealing form 23 is provided between the two tie beam side forms 22. The corner sealing form 23 is simultaneously connected to the tie beam side form 22 and the tie beam bottom form 21. The corner sealing formwork 23 is vertical and located between the bottom of the tie beam body 5 and the pier 4, that is, the upper end of the corner sealing formwork 23 is filled between one end of the tie beam bottom formwork 21 and the pier 4, and the corner sealing formwork 23 is a rectangular formwork, and the tie beam side formwork 22 is close to the lower ends of the two sides of the pier 4 and is bolted to the upper sides of the corner sealing formwork 23; when the corner sealing formwork 23 is long, it can be designed into two symmetrical parts, each part is connected to the tie beam side formwork 22, and then reinforced with the back ribs in the prior art for easy disassembly; the tie beam bottom formwork 21 and one of the tie beam side formworks 22 are rotatably connected, and the tie beam side formwork 22 is a rotating tie beam side formwork 22, and the rotating connection method is also connected by a rotating component 35 (not shown in the figure), and the rotating side of the rotating tie beam side formwork and the distribution bracket is located on the same side of the tie beam body 5, and the other tie beam side formwork 22 is a detachable tie beam side formwork 22. After the corner sealing formwork 23 is removed, a shape as shown in the figure is formed between the tie beam bottom formwork 21, the rotating tie beam side formwork 22 and the pier 4. Figure 12 As shown in the strip gap 630, the end of the steel cable 610 passes through the strip gap 630, the lower side of the tie beam body 5 and is connected to the pull ring 341 of the distribution bracket 34 in sequence; since the rotating tie beam side mold 22 and the tie beam bottom mold 21 are rotatably connected, the steel cable 610 must pass through the strip gap 630 to reach the lower side of the tie beam body 5.

[0071] e. Specific implementation methods:

[0072] 1. Pre-embed the column 121 on the upper surface of the cast section of the pier below the tie beam casting section, drive the lifting jack 136, and the lifting jack 136 drives the lifting frame 13 to climb on the support rod 137, thereby driving the pier formwork mechanism 1 to slide upward to the first tie beam casting section. During the climbing, the synchronous lifting method used for the multi-pier construction platform is used, that is, by controlling the climbing distance of each climbing jack, so that all climbings are kept synchronously lifted. At this time, the support conversion unit 14 is not involved in the system.

[0073] 2. Remove the detachable side form 111 and connect the columns 121, beams 122, tie rods 123, cantilever beams 33 and distribution brackets 34 in sequence.

[0074] 3. Support the tie beam bottom formwork 21 on the distribution bracket 34, and connect the non-detachable side formwork 112, the tie beam side formwork 22, the corner sealing formwork 23 and the tie beam bottom formwork 21.

[0075] 4. Pour the concrete of the tie beam pouring section. After the time required by the specification is reached, remove the detachable tie beam side formwork 22 and the corner sealing formwork 23, remove the connecting bolts of the free side of the distribution bracket 34 and the cantilever beam 33, and drive the adjustment jack 124. Figure 6 As shown, the front pull rod 123 and the cantilever beam 33 are driven to move downward, thereby driving the tie beam bottom mold 21 to rotate downward along with the free side of the distribution bracket 34 until the free side of the distribution bracket 34 is flush with the front side of the cantilever beam 33, that is, the main beam 342 on the front side of the distribution bracket 34 no longer protrudes forward relative to the front cantilever beam 33, as shown in FIG. Figure 13 As shown, the rotating assembly 35 is indicated by a circle, and the cross section of the tie beam body 5 is indicated by a rectangle. At this time, the front cantilever beam 33 still supports the distribution bracket 34, and the distribution bracket 34 and the tie beam bottom form 21 are tilted due to the rotation, that is, a gap is generated between the tie beam bottom form 21 and the bottom of the cast tie beam body 5, as shown in FIG. Figure 12 As shown, since the corner sealing formwork 23 has been removed, a strip gap 630 is formed between the tie beam bottom formwork 21 and the pier 4. During the rotation of the distribution bracket 34 and the tie beam bottom formwork 21, the tie beam body 5 and the rotating tie beam side formwork 22 are demoulded, and finally the rotating tie beam side formwork 22 is leaned against the side of the tie beam body 5 or the inner side of the installation platform 7.

[0076] like Figure 13 As shown, the worker stands on the side close to the rotating side of the distribution bracket 34, that is, the left side of the distribution bracket 34, and hangs the upper end of the steel cable 610 on the installation platform 7 (not shown in the figure), and passes the lower end of the steel cable 610 from the strip gap 630 on the side of the tie beam body 5 close to the rotating side (the left side of the tie beam body 5) to the lower side of the tie beam body 5 (that is, the gap between the distribution bracket 34 and the bottom of the cast tie beam body 5), and finally hangs it on the pull ring 341 (not shown in the figure) on the free side (the right end of the distribution bracket 34).

[0077] During this process, the bottom of the tie beam body 5 is blocked by sunlight, and it is dark and unclear, and the position of the lower end of the steel cable 610 cannot be seen clearly. At the same time, there may be foreign objects blocking the steel cable 610, making it difficult to smoothly pass the steel cable 610 through the bottom of the tie beam body 5; In this solution, if Figure 12As shown, the end of the steel cable 610 is placed on the tie beam bottom formwork 21 (since the end of the steel cable 610 is a metal hook, it usually has a certain weight) so that the part of the steel cable 610 close to the end can be pushed by a rod-shaped object 620 such as a steel bar. Since the part other than the end of the steel cable 610 is in the strip gap 630, the position of the steel cable 610 can be observed. The strip gap 630 provides a guide for the steel cable 610, and the end of the steel cable 610 is pushed from the lower side of the tie beam bottom formwork 21 to the upper side of the tie beam bottom formwork 21. Then another worker catches the end of the steel cable 610 on the upper side of the tie beam bottom formwork 21 and hooks the end of the steel cable 610 on the pull ring 341 on the free side of the distribution bracket 34 (not shown in the figure).

[0078] 5. Drive the adjustment jack 124 to move the cantilever beam 33 further downward until the cantilever beam 33 can no longer support the free side of the distribution bracket 34. At the same time, extend the steel cable 610 downward and slowly lower the free end of the distribution bracket 34 to prevent damage to the distribution bracket 34 due to excessive rotation speed.

[0079] 6. Insert the limiting rod 321 of the limiting member 32 through the cylinder 361, the first limiting hole, and the second limiting hole in sequence. Rotate the limiting portion 322 of the limiting member 32 to thread the limiting portion 322 and the cylinder 361. Then, insert the lower end of the limiting rod 321 into the limiting groove and tighten it. (This step may be performed depending on actual conditions such as wind speed.)

[0080] 7. Connect the lifting frame 13 and the crossbeam 122 via the support conversion unit 14, remove the bolts between the column 121 and the crossbeam 122, and drive the lifting jack 136, thereby driving the tie beam support mechanism (the portion excluding the column 121) and the pier formwork mechanism 1 to slide upward. When the lifting reaches the section to be poured for the next pier column 4, the removable side formwork 111 and the non-removable side formwork 112 are bolted together;

[0081] When the pier formwork mechanism 1 drives the distribution bracket 34, the tie beam bottom formwork 21 and the rotating tie beam side formwork 22 to rise together, the rotating tie beam side formwork 22 loses the support of the tie beam body 5, and under the action of gravity, it rotates around the connection position with the tie beam bottom formwork 21 and collides with the tie beam bottom formwork 21. In the process of rising, under the action of wind load, it continuously collides with the tie beam bottom formwork 21, so that the concrete and other impurities remaining in the rotating tie beam side formwork 22 and the tie beam bottom formwork 21 are shaken off, so as to improve the concrete appearance quality of the tie beam body 5 when the tie beam body 5 is poured next time.

[0082] 8. Cast several sections of pier columns 4, slide the pier formwork mechanism 1 to the second tie beam casting section, pull the steel cable 610 to return the distribution bracket 34 to the horizontal position, bolt the free side of the distribution bracket 34 and the cantilever beam 33, and repeat steps 3-7.

[0083] Example 2

[0084] Example 2 is a specific implementation step of Example 1, which is a synchronous lifting method for a multi-pillar construction platform, including the following steps:

[0085] Step 1: Prepare the synchronous lifting system for the multi-pillar construction platform described in Example 1, and adjust the displacement sensor 820 to the initial state;

[0086] Step 2: Simultaneously drive all lifting jacks 136 to climb on the support rods 137, thereby driving the lifting frame 13 and the pier formwork mechanism 1 to climb. The displacement sensor 820 transmits the measured climbing distance of the lifting jack 136 to the controller 810. The controller 810 independently controls the climbing of each lifting jack 136 to ensure that the distances displayed by all displacement sensors 820 are adjusted to the same.

[0087] Step 3. After the lifting jacks 136 have climbed multiple times, when the angle between the lifting frame 13 and the horizontal plane exceeds the angle setting value, the controller 810 controls all the lifting jacks 136 to stop climbing together, calculates and displays the stroke amount that each jack needs to add, so as to adjust the first channel steel unit 131 and the second channel steel unit 132 to the horizontal: the controller 810 controls each lifting jack 136 to climb individually until the lifting frame 13 is parallel to the horizontal plane, adjusts all displacement sensors 820 to the initial state, and repeats step 2.

[0088] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. Synchronous lifting system for multi-pier construction platform, characterized by: The system includes several tie beam support mechanisms, pier formwork mechanisms, and a climbing control system. The tie beam support mechanisms connect adjacent pier formwork mechanisms. Each pier formwork mechanism includes a lifting frame equipped with several lifting jacks. Vertical support rods are pre-embedded in the cast sections of the pier columns. The upper ends of the support rods connect to the lifting jacks, and the oil circuit of each lifting jack is independently controlled. The climbing control system includes a controller and several displacement sensors, one mounted on each lifting jack. The displacement sensors can measure the distance the lifting jack climbs on the support rods. The displacement sensors are connected to the controller, which transmits the measured distance signal to the controller. The controller adjusts each lifting jack to ensure that the distance signal of all displacement sensors is the same. The lifting frame includes a first channel steel unit and a second channel steel unit which are vertically connected to each other and arranged horizontally; It also includes a tie beam formwork mechanism. Each pier formwork mechanism includes a support frame connected to the cast section of the pier. The support frame is provided with an adjustment unit. The support frame includes a crossbeam, two columns, and four tie rods. The columns are pre-embedded in the upper surface of the cast section of the pier below the tie beam casting section. The crossbeam is formed by welding two back-to-back parallel channel steels. The middle of the crossbeam is bolted to the top of the column. The crossbeam is provided with an adjustment unit, and the upper ends of the tie rods are connected to the adjustment unit. The tie beam support mechanism includes several cantilever beams and distribution brackets. The cantilever beams are respectively arranged on both sides of the pier. The two ends of the cantilever beams are respectively connected to the lower ends of the tie rods of the template mechanisms of two adjacent piers. The adjustment unit can drive the cantilever beams to move. In the initial state, the distribution bracket is supported on the cantilever beam between two adjacent piers, and the tie beam template mechanism is supported on the distribution bracket. The two sides of the distribution bracket are respectively a rotating side and a free side. The rotating side is rotationally connected to the cantilever beam on one side of the pier, and the free side is detachably connected to the cantilever beam on the other side. The free side is disconnected from the cantilever beam on the other side, and the adjustment unit drives the cantilever beam on that side to move. The distribution bracket loses the support of the cantilever beam on that side, and the free side rotates under the action of gravity until the distribution bracket is vertical. A support conversion unit is also provided on the first channel steel unit, and the support conversion unit is arranged on the inner side of the lifting member. The support conversion unit includes two hanging rods and three rectangular plates. The two hanging rods are both inverted U-shaped rods that have been bent 90° twice. The two hanging rods are hung on the two channel steels at the same time. The hanging rods are provided with threads and several nuts. The four ends of the two hanging rods pass through the four corners of the rectangular plates respectively. After tightening the nuts, the uppermost rectangular plate and the hanging rod can clamp the two channel steels, and the remaining two rectangular plates clamp the crossbeam.

2. The synchronous lifting system for a multi-pillar construction platform according to claim 1, characterized in that: The climbing control system also includes a horizontal attitude sensor, which is arranged on the lifting frame and connected to the controller. The horizontal attitude sensor uses the horizontal plane as the initial plane. When the angle between the lifting frame and the horizontal plane exceeds the angle setting value, the controller controls all lifting jacks to stop climbing.

3. The synchronous lifting system for a multi-pillar construction platform according to claim 2, characterized in that: The horizontal attitude sensor is set at the vertical foot position of the first channel steel unit and the second channel steel unit. The controller calculates and displays the stroke amount that each jack needs to add based on the inclination angle and the distance of the lifting jack measured by the horizontal attitude sensor, so as to adjust the first channel steel unit and the second channel steel unit to a horizontal level.

4. The synchronous lifting system for a multi-pillar construction platform according to claim 3, characterized in that: The adjusting unit is an adjusting jack, the upper end of the pull rod is connected to the adjusting jack, and the adjusting jack can drive the pull rod to rise or fall.

5. The synchronous lifting system for a multi-pillar construction platform according to claim 4, characterized in that: The free side of the distribution bracket protrudes relative to the corresponding cantilever beam side, and the free side of the distribution bracket can be connected to the steel cable. After driving the adjustment jack close to the free side of the distribution bracket, the cantilever beam and the free side of the distribution bracket move downward, and the distribution bracket is in an inclined state, so that the steel cable can successively pass around the side of the tie beam close to the rotating side, the lower side of the tie beam, and connect to the free side of the distribution bracket.

6. The synchronous lifting system for a multi-pillar construction platform according to claim 5, characterized in that: The tie beam formwork mechanism includes a tie beam bottom formwork and two tie beam side formworks. The tie beam bottom formwork is horizontally connected to the distribution bracket. The two tie beam side formworks are respectively arranged on both sides of the tie beam. A corner sealing formwork is provided between the two tie beam side formworks. The corner sealing formwork is filled between one end of the bottom of the tie beam and the pier. The tie beam bottom formwork is rotatably connected to one of the tie beam side formworks. The tie beam side formwork is a rotating tie beam side formwork, and the other tie beam side formwork is a detachable tie beam side formwork. After the corner sealing formwork is removed, a strip gap is formed between the tie beam bottom formwork, the rotating tie beam side formwork and the pier. The end of the steel cable passes through the strip gap, the lower side of the tie beam and is connected to the free side of the distribution bracket in sequence.

7. The lifting method of the synchronous lifting system for a multi-pillar construction platform according to claim 3, characterized in that: The following steps are involved: Step 1: Adjust the displacement sensor to the initial state; Step 2: Simultaneously drive all lifting jacks to climb on the support rods, thereby driving the lifting frame and the pier formwork mechanism to climb. The displacement sensor transmits the measured climbing distance of the lifting jack to the controller. The controller controls the lifting jacks according to the data of the displacement sensor to ensure that the displacement of each lifting jack is equal; Step 3. After the lifting jacks have climbed several times, when the angle between the lifting frame and the horizontal plane exceeds the angle setting value, the controller controls all the lifting jacks to stop climbing together, calculates and displays the stroke amount that each jack needs to add, so as to adjust the first channel steel unit and the second channel steel unit to the horizontal: the controller controls each lifting jack to climb individually until the lifting frame is parallel to the horizontal plane, adjusts all displacement sensors to the initial state, and repeats step 2.

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