A cast-in-place box girder concrete pouring counter-pressure device and process thereof

Abstract

The application discloses a cast-in-situ box girder concrete pouring counter-pressure device and a process thereof, and relates to the technical field of bridge concrete pouring, which comprises a bottom plate, a web plate assembled on the bottom plate, a pressing plate, a tight pressing part installed on the pressing plate, a plurality of sealing blocks and pressing parts arranged along the length direction of the pressing plate and arrayed on the abutting surface of the pressing plate. The sealing blocks and the pressing parts are arranged in a staggered manner on the abutting surface of the pressing plate to jointly form a blocking surface. The pressing plate is fixed on the bottom plate by the tight pressing part, and the pressing part continuously provides an active pressing force towards the web plate. The bottom edge of the blocking surface is kept in close contact with the joint line between the web plate and the bottom plate during the whole pouring period, so that the leakage of slurry caused by the gap generated by the outward expansion of the web plate and the working hours required for later slag cleaning can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of bridge concrete pouring technology, and in particular to a counter-pressure device and process for pouring cast-in-place box girder concrete. Background Technology

[0002] During the construction of cast-in-place box girder concrete, grout leakage and backflow are prone to occur at the junction of the bottom of the web and the base slab. When concrete is poured from above the web, the lateral pressure of the concrete is concentrated at the bottom of the web, and the grout can easily seep out from the gaps in the formwork and rise to the upper surface of the base slab. This results in the base slab concrete thickness exceeding the design, a decrease in surface flatness, and the leaked grout needs to be manually removed before initial setting, which seriously affects the construction quality and efficiency.

[0003] Currently, in engineering projects, wooden or steel plates are often used as pressure plates to cover the junction of the bottom and web plates. The pressure plates are then tightened using timber backings, threaded steel bars, and other components to form a static counter-pressure system, attempting to control grout leakage through the passive blocking effect of the pressure plates. However, this traditional counter-pressure structure has certain shortcomings in practical applications.

[0004] On the one hand, during the concrete pouring process, the web formwork will undergo slight outward elastic deformation under the action of lateral pressure, which will cause gaps to appear in the pressure plate that was originally tightly attached to the web, and the grout will easily leak out from the gaps. On the other hand, the reinforcements such as timber and rebar are rigid supports with fixed lengths, and cannot automatically compensate for the clamping force when the web expands outward. The fit between the pressure plate and the web will decrease rapidly as the web deforms. Summary of the Invention

[0005] The purpose of this invention is to provide a counter-pressure device for cast-in-place box girder concrete pouring, its process and recycling process, so as to solve the technical problem that the counter-pressure device in the prior art cannot adapt to the dynamic expansion of the web, resulting in grout leakage.

[0006] The technical problem to be solved by this invention can be achieved through the following technical solution: A counter-pressure device for cast-in-place box girder concrete pouring includes a base plate and a web plate assembled on the base plate, and a pressure plate. A clamping member is installed on the pressure plate to make the pressure plate abut against the base plate. One side of the pressure plate is a top surface, and multiple blocking blocks and pressure-applying members are arranged in an array along its length. The blocking blocks and pressure-applying members are staggered and form a blocking surface. The blocking surface contacts the web plate, and the bottom edge is located at the junction of the web plate and the base plate. The pressure-applying members continuously provide a holding force toward the web plate.

[0007] Preferably, the pressure-applying component includes a lower edge plate constructed on the pressure-holding plate, the lower edge plate being flush with the bottom of the pressure-holding plate, a guide plate constructed on the pressure-holding plate above the lower edge plate, a connecting cylinder slidably fitted on the guide plate, a pressure-applying plate constructed at the free end of the connecting cylinder, the bottom of the pressure-applying plate being flush with the pressure-holding plate, and when the pressure-applying plate contacts the end of the lower edge plate, the side of the pressure-applying plate away from the corresponding guide plate being flush with the sealing block, a transmission component being installed on the sealing block, and when grouting is performed inside the web, the transmission component provides a holding force toward the corresponding web direction to the pressure-applying plate.

[0008] Preferably, the transmission component includes a touch plate that is horizontally slidably mounted on one side of the sealing block. The sealing block is equipped with a linkage assembly that acts on the touch plate and the pressure plate. When the blocking surface contacts the web, the touch plate simultaneously contacts the corresponding web. When the touch plate floats away from the web, the linkage assembly provides a force toward the web to the pressure plate.

[0009] Preferably, the linkage assembly includes a guide rod vertically mounted on the sealing block, a sliding plate vertically slidably mounted on the guide rod, a transmission block at one end of the sliding plate, a limit block mounted on the top of the guide rod, a return spring between the guide plate and the connecting cylinder, a first inclined surface and a second inclined surface mounted on the transmission block, one side of the actuating plate contacting the first inclined surface, and one side of the pressure plate contacting the second inclined surface.

[0010] Preferably, the pressure plate has a plurality of through holes arranged in a linear array, the clamping member includes a tie rod movably inserted into the through hole, one end of the tie rod is inserted into the base plate, a clamping member is slidably sleeved on the tie rod, the clamping member also includes a steel pipe placed on the pressure plate, and a tightening nut is screwed into the tie rod.

[0011] Preferably, the clamping element is a butterfly buckle, and there are two steel pipes, both of which are in contact with the butterfly buckle.

[0012] Preferably, a plastic tube is pre-embedded in the base plate, and one end of the pull rod passes through the plastic tube and is connected to a locking element.

[0013] Preferably, the locking element includes a pad and a locking nut, one end of the pull rod passes through the plastic tube and the pad is sleeved on the pull rod, the pad is in contact with the bottom surface of the base plate, and the locking nut is screwed into the pull rod and pressed against the pad.

[0014] A reverse pressure process for cast-in-place box girder concrete pouring, using the aforementioned reverse pressure device for cast-in-place box girder concrete pouring, is characterized by comprising the following steps: S1: Place the pressure plate on the base plate, so that the blocking surface on one side of the pressure plate is in close contact with the outer side of the bottom of the web plate, and the bottom edge of the blocking surface is aligned with the seam line where the web plate and the base plate meet. Use a clamping device to press and fix the pressure plate to the base plate. S2: Concrete is poured into the web formwork, and the web undergoes outward expansion deformation under the lateral pressure of the concrete. S3: The outward expansion of the web pushes the sealing block to trigger the pressure application component, which continuously provides a holding force towards the web, keeping the blocking surface in close contact with the web and preventing grout from leaking out from the joint seam. S4: After the concrete inside the web has solidified, release the clamping device and remove the pressure plate.

[0015] Preferably, the sealing block and the pressure-applying member are staggered. When the web expands outward, the pressure-applying member automatically moves towards the web under the linkage of the sealing block, increasing the contact pressure between the blocking surface and the web.

[0016] The beneficial effects of this invention are: 1. This invention employs multiple staggered sealing blocks and pressure-applying components to construct a blocking surface on the top surface of the pressure-bearing plate. While the pressure-bearing plate is pressed down and fixed to the base plate by the clamping components, the pressure-applying components continuously provide active holding force towards the web. This ensures that the bottom edge of the blocking surface remains tightly fitted to the joint between the web and the base plate throughout the entire pouring cycle, effectively reducing grout leakage caused by gaps created by the outward expansion of the web and the time required for subsequent slag removal. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0018] Figure 2 This is the present invention. Figure 1 Partial three-dimensional sectional view.

[0019] Figure 3 This is the present invention. Figure 2 Enlarged view of the structure at point A in the middle.

[0020] Figure 4 This is the present invention. Figure 1 Another perspective illustration.

[0021] Figure 5 This is a partial structural schematic diagram of the present invention.

[0022] Figure 6 This is the present invention. Figure 5 Partial three-dimensional sectional view.

[0023] Figure 7 This is the present invention. Figure 5 Another perspective illustration.

[0024] Figure 8 This is an enlarged view of the structure at point B in section 6 of the present invention.

[0025] Explanation of reference numerals in the attached figures: 1. Pressure plate; 2. Clamping component; 201. Through hole; 202. Pull screw; 203. Abutting component; 204. Steel pipe; 205. Tightening nut; 3. Base plate; 4. Web plate; 5. Sealing block; 6. Pressure application component; 601. Lower edge plate; 602. Guide plate; 603. Connecting cylinder; 604. Pressure application plate; 7. Blocking surface; 8. Transmission component; 801. Touch plate; 9. Linkage assembly; 901. Guide rod; 902. Sliding plate; 903. Transmission block; 904. Limiting block; 905. Returning spring; 906. First inclined surface; 907. Second inclined surface; 10. Plastic pipe; 11. Locking component; 1101. Pad; 1102. Locking nut. Detailed Implementation

[0026] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0027] Example 1 Currently, in engineering projects, wooden or steel plates are often used as pressure plates to cover the junction of the bottom plate 3 and the web plate 4. The pressure plates are then tightened using components such as wooden back braces and threaded steel bars to form a static counter-pressure system, attempting to control grout leakage by passively blocking the pressure plates. This traditional counter-pressure structure has certain shortcomings in practical applications.

[0028] On the one hand, during the concrete pouring process, the web plate 4 formwork will undergo slight outward elastic deformation under the action of lateral pressure, which will cause gaps to appear in the pressure plate that was originally tightly attached to the web plate 4, and the grout will easily leak out from the gaps. On the other hand, the timber, rebar and other reinforcement components are rigid supports with fixed lengths, and cannot automatically compensate for the clamping force when the web plate 4 expands outward. The fit between the pressure plate and the web plate 4 will decrease rapidly as the web plate 4 deforms.

[0029] like Figures 1 to 8As shown, a cast-in-place box girder concrete pouring counter-pressure device includes a base plate 3 and a web plate 4 assembled on the base plate 3. It should be noted that both the base plate 3 and the web plate 4 are existing bridge main structures or their corresponding formwork structures used in the construction of the cast-in-place box girder. The base plate 3 is usually poured horizontally at the bottom and is mainly used to bear the self-weight of the box girder and the overall load of the upper part, serving as the bottom load-bearing base of the entire box girder. The web plate 4 is vertically and symmetrically assembled on both sides above the base plate 3, mainly used to connect the base plate 3 and the subsequently poured top plate, and spatially forms the sidewalls of the box girder. It also includes a pressure plate 1, on which a clamping member 2 is installed. The clamping member 2 causes the pressure plate 1 to abut against the bottom plate 3. One side of the pressure plate 1 is a top surface, and multiple sealing blocks 5 and pressure applying members 6 are arranged in an array along its length. The sealing blocks 5 and the pressure applying members 6 are staggered. The sealing blocks 5 and the pressure applying members 6 form a blocking surface 7. The blocking surface 7 contacts the web plate 4, and the bottom edge is located at the junction seam of the web plate 4 and the bottom plate 3. The pressure applying members 6 continuously provide a holding force toward the web plate 4.

[0030] The working principle of the concrete pouring counter-pressure device for cast-in-place box girder is as follows: Before pouring concrete into the web 4, the pressure plate 1 is laid flat on the surface of the base plate 3, so that the blocking surface 7, formed by multiple sealing blocks 5 and pressure applying elements 6, contacts the outer wall of the web 4, and the bottom of the blocking surface 7 is aligned along the edge and covers the joint between the web 4 and the base plate 3. Subsequently, by operating the clamping elements 2 installed on the pressure plate 1, a vertically downward pressure is applied to the pressure plate 1, so that the pressure plate 1 is fixed against the base plate 3. During the pouring of concrete into the web 4, the pressure applying elements 6 arrayed on the side of the pressure plate 1 continuously apply an active horizontal holding force towards the web 4 to the side wall of the web 4. When the web plate 4 formwork undergoes outward elastic deformation or slight outward displacement under the lateral pressure of the internal concrete, the pressure-applying component 6 can adaptively follow and continuously maintain the pressing state, working together with the staggered sealing blocks 5 to maintain the tight fit between the blocking surface 7 and the side wall of the web plate 4, thereby continuously and dynamically sealing the grout leakage channel at the junction.

[0031] It should be emphasized that the core improvement of this embodiment lies in the following: multiple staggered sealing blocks 5 and pressure-applying components 6 are used to construct a blocking surface 7 on the top surface of the pressure plate 1. While the pressure plate 1 is pressed down and fixed to the bottom plate 3 by the clamping component 2, the pressure-applying component 6 continuously provides active holding force towards the web plate 4. The adoption of a dynamic and static combined bidirectional reinforcement structure enables the device to adaptively perform horizontal clamping compensation according to the stress deformation of the web plate 4 template, ensuring that the bottom edge of the blocking surface 7 remains tightly fitted to the joint between the web plate 4 and the bottom plate 3 throughout the entire pouring cycle. This effectively reduces grout leakage caused by gaps due to the outward expansion of the web plate 4 and the time required for subsequent slag removal.

[0032] Example 2 In the above embodiment, the pressure-applying component 6 continuously provides holding force towards the web 4 through its own elasticity or pre-tightening force to compensate for the slight outward expansion deformation of the web 4 under the action of concrete lateral pressure. However, as the concrete pouring height gradually increases, the lateral pressure on the bottom of the web 4 continuously increases, and the outward expansion deformation of the web 4 also increases accordingly. If the pressure-applying component 6 only relies on the initial pre-tightening force for compensation, its holding force may be insufficient to maintain the tight fit between the blocking surface 7 and the web 4 after the deformation of the web 4 exceeds the pre-tightening stroke, resulting in the reappearance of gaps and affecting the continuous suppression effect on grout leakage and backflow. Therefore, how to ensure that the pressure-applying component 6 can continuously obtain sufficient holding force according to the changes in the lateral pressure of the web 4 during the concrete pouring process, and ensure that the blocking surface 7 and the web 4 always remain in tight fit, is a problem that needs to be solved.

[0033] In this embodiment, combined with Figures 1 to 8 As shown, the pressure-applying component 6 includes a lower edge plate 601 constructed on the pressure-holding plate 1. The lower edge plate 601 is flush with the bottom of the pressure-holding plate 1. A guide plate 602 is constructed on the pressure-holding plate 1 above the lower edge plate 601. A connecting cylinder 603 is slidably fitted on the guide plate 602. A pressure-applying plate 604 is constructed at the free end of the connecting cylinder 603. The bottom of the pressure-applying plate 604 is flush with the pressure-holding plate 1. When the pressure-applying plate 604 contacts the end of the lower edge plate 601, the side of the pressure-applying plate 604 away from the corresponding guide plate 602 is flush with the sealing block 5. A transmission component 8 is installed on the sealing block 5. When grouting is performed in the web 4, the transmission component 8 provides a holding force to the pressure-applying plate 604 in the direction of the corresponding web 4.

[0034] The working principle of the pressure-applying component 6: During construction, the pressure plate 1 is fixed to the base plate 3 by the clamping component 2. The lower edge plate 601, the pressure plate 604, and the end of the sealing block 5 are all in contact with the web plate 4. When concrete begins to be poured from above the web plate 4, the lateral pressure of the concrete acts on the inner wall of the web plate 4, and the web plate 4 tends to deform outward. At this time, the transmission component 8 is activated by the lateral pressure of the concrete or the pouring action, driving the connecting cylinder 603 to slide along the guide plate 602. The connecting cylinder 603 drives the pressure plate 604 to move. The transmission component 8 continuously provides the pressure plate 604 with a holding force in the direction of the web plate 4. The pressure plate 604 transmits the holding force to the web plate 4. When the web plate 4 deforms outward due to the lateral pressure, the transmission component 8 can continuously compensate and tighten, so that the blocking surface 7 always keeps in close contact with the web plate 4.

[0035] In this embodiment, combined with Figure 8As shown, the transmission component 8 includes a touch plate 801 horizontally slidably mounted on one side of the sealing block 5. A linkage assembly 9 is installed on the sealing block 5, acting on the touch plate 801 and the pressure plate 604. When the blocking surface 7 contacts the web 4, the touch plate 801 simultaneously contacts the corresponding web 4. When the touch plate 801 floats away from the web 4, the linkage assembly 9 provides a force towards the web 4 to the pressure plate 604. In other words, when concrete is poured from above the web 4, the web 4 tends to deform outward under lateral pressure, pushing the touch plate 801 in contact with it to float away from the web 4. After the touch plate 801 displaces, the linkage assembly 9 converts the floating displacement of the touch plate 801 into a thrust force on the pressure plate 604 towards the web 4, causing the pressure plate 604 to press more tightly against the web 4. The greater the outward expansion deformation of the web plate 4, the greater the floating displacement of the trigger plate 801, and the corresponding increase in the holding force transmitted to the pressure plate 604 through the linkage component 9. This forms an adaptive compensation that changes with the side pressure of the web plate 4, ensuring that the blocking surface 7 always remains in close contact with the web plate 4, effectively preventing slurry from leaking out from the joint seam.

[0036] In this embodiment, combined with Figure 1 and Figure 8 As shown, the linkage assembly 9 includes a guide rod 901 vertically mounted on the sealing block 5. A sliding plate 902 is vertically slidably mounted on the guide rod 901. A transmission block 903 is constructed at one end of the sliding plate 902. A limit block 904 is installed on the top of the guide rod 901. A return spring 905 is installed between the guide plate 902 and the connecting cylinder 603. A first inclined surface 906 and a second inclined surface 907 are constructed on the transmission block 903. One side of the actuating plate 801 contacts the first inclined surface 906, and one side of the pressure plate 604 is used to contact the second inclined surface 907. Figure 8As shown, during construction, the pressure plate 1 is fixed to the base plate 3 by the clamping member 2, the blocking surface 7 contacts the web plate 4, and the actuating plate 801 simultaneously contacts the corresponding web plate 4. In the initial state, under the action of the return spring 905, the connecting pressure plate 604 is flush with the sealing block 5, and at this time, the pressure plate 604 abuts against one end of the lower edge plate 601. The lower edge plate 601 plays a limiting role, preventing the pressure plate 604 from not being in contact with the web plate 4 after the sealing block 5 is in contact with the corresponding web plate 4. When concrete is poured from above the web plate 4, the web plate 4 tends to deform outward under the action of lateral pressure. The web plate 4 pushes the actuating plate 801 to float away from the web plate 4. When the actuating plate 801 moves, it squeezes the first inclined surface 906 on the transmission block 903, pushing the transmission block 903 and the sliding plate 902 to slide vertically downward along the guide rod 901. During the upward movement of the sliding plate 902, the second inclined surface 907 on the transmission block 903 presses against the pressure plate 604, converting the vertical downward movement of the sliding plate 902 into a horizontal thrust of the pressure plate 604 toward the web plate 4. This causes the pressure plate 604 to press more tightly against the web plate 4. The greater the outward expansion deformation of the web plate 4, the greater the floating displacement of the touch plate 801, and the more the sliding plate 902 moves downward. The holding force transmitted to the pressure plate 604 through the second inclined surface 907 also increases accordingly, forming an adaptive compensation that changes with the lateral pressure of the web plate 4. This ensures that the blocking surface 7 always remains in close contact with the web plate 4, effectively preventing slurry from leaking out from the joint seam.

[0037] Example 3 In the above embodiment, the pressure plate 1 achieves dynamic sealing of the bottom joint of the web 4 through the pressure application member 6 and the sealing block 5. However, the pressure plate 1 itself needs to be firmly fixed to the bottom plate 3 by the clamping member 2 to resist the upward lifting force generated by the lateral pressure of the web 4 on the pressure plate 1 during concrete pouring. In the prior art, the pressure plate is often fixed by wooden back ribs and threaded steel bars, which has poor longitudinal bridge-direction fixing stability and is prone to deformation and displacement under the action of concrete lateral pressure, resulting in gaps between the pressure plate and the bottom plate 3, and grout leakage from the gaps.

[0038] In this embodiment, combined with Figures 1 to 3As shown, the pressure plate 1 has a plurality of through holes 201 arranged in a linear array. The clamping member 2 includes a tie rod 202 movably inserted into the through hole 201. One end of the tie rod 202 passes through the base plate 3. A clamping member 203 is slidably sleeved on the tie rod 202. The clamping member 2 also includes a steel pipe 204 placed on the pressure plate 1. A tightening nut 205 is screwed into the tie rod 202. The clamping member 203 is a butterfly buckle. There are two steel pipes 204, and both are in contact with the butterfly buckle. A plastic tube 10 is pre-embedded in the base plate 3. One end of the tie rod 202 passes through the plastic tube 10 and is connected to a locking member 11. The plastic tube 10 is pre-embedded before the base plate 3 is poured. After placing the pressure plate 1 at the junction of the base plate 3 and the web plate 4, one end of the tie rod 202 is passed through the through hole 201 from above the pressure plate 1 and through the plastic tube 10 pre-embedded in the base plate 3. The bottom end of the tie rod 202 is then locked and fixed below the base plate 3 by the locking piece 11. Subsequently, the butterfly buckle slidably fitted on the tie rod 202 is used to place two steel pipes 204 along the longitudinal bridge direction of the pressure plate 1 on the top of the pressure plate 1, with both steel pipes 204 in contact with the wing plates of each butterfly buckle. Finally, tightening nuts 205 are screwed into each tie rod 202. When tightening the tightening nuts 205, the nuts transmit the clamping force evenly to the pressure plate 1 through the steel pipes 204 and the butterfly buckles. Two steel pipes 204 span multiple tie rods 202, evenly distributing the concentrated clamping force of each tie rod 202 along the length of the steel pipes 204. The pressure plate 1 experiences continuous and uniform clamping force along its entire longitudinal length, ensuring a tight fit between the pressure plate 1 and the base plate 3. A plastic pipe 10 pre-embedded within the base plate 3 provides a passageway for the tie rods 202 and protects the contact surface between the tie rods 202 and the concrete of the base plate 3 after pouring. After pouring, loosening the tightening nut 205 releases the locking element 11 from the tie rods 202. The steel pipes 204 and tie rods 202 can then be removed, allowing the pressure plate 1 to be dismantled. The interior of the plastic pipe 10 can then be sealed with concrete, enabling the tie rods 202 to be reused, thus saving costs.

[0039] The clamping component 2 adopts a combination of tie rods 202, butterfly buckles, and two steel pipes 204 for fixing. The two steel pipes 204 are set on both sides along the longitudinal bridge direction of the clamping plate 1 and contact each butterfly buckle wing plate. The concentrated pressure of tightening nut 205 is evenly distributed to the entire length of clamping plate 1 through steel pipes 204, so that clamping plate 1 is subjected to continuous and uniform clamping force. This effectively avoids the problems of uneven pressure on the clamping plate, local warping, and gap leakage caused by point contact or line contact fixing of traditional wooden back ribs. At the same time, the plastic pipe 10 pre-embedded in the base plate 3 provides a passage for tie rods 202 to pass through, so that tie rods 202 can be disassembled and reused, reducing construction costs.

[0040] It should be emphasized that the core improvement of this embodiment lies in the combination of tie rods 202, butterfly buckles, and two steel pipes 204 used for fixing the clamping component 2. The two steel pipes 204 are arranged on both sides along the longitudinal direction of the clamping plate 1 and contact the butterfly buckle wing plates. The concentrated pressure of tightening nut 205 is evenly distributed to the clamping plate 1 through the steel pipes 204, so that the clamping plate 1 is subjected to continuous and uniform clamping force. This effectively avoids the problems of uneven pressure on the clamping plate, local warping, and gap leakage caused by point contact or line contact fixing of traditional timber back ribs. At the same time, the plastic pipe 10 pre-embedded in the base plate 3 provides a passage for the tie rods 202 to pass through, so that the tie rods 202 can be disassembled and reused, reducing construction costs. In this embodiment, combined with Figures 1 to 8 As shown, the locking component 11 includes a pad 1101 and a locking nut 1102. One end of the pull rod 202 passes through the plastic tube 10, and the pad 1101 is fitted onto the pull rod 202. The pad 1101 is in contact with the bottom surface of the base plate 3. The locking nut 1102 is screwed into the pull rod 202 and pressed against the pad 1101. That is to say, during construction, the plastic tube 10 is pre-embedded before the base plate 3 is poured. After the pressure plate 1 is placed at the junction of the base plate 3 and the web plate 4, one end of the pull rod 202 passes through the through hole 201 from above the pressure plate 1 and through the plastic tube 10 pre-embedded in the base plate 3. Subsequently, the operator places a pad 1101 over the protruding end of the tie rod 202 under the base plate 3. The pad 1101 is then fitted against the bottom surface of the base plate 3. The locking nut 1102 is then screwed into the tie rod 202 and tightened, ensuring the locking nut 1102 is firmly pressed against the pad 1101. The pad 1101 increases the contact area between the locking nut 1102 and the bottom surface of the base plate 3, preventing the locking nut 1102 from directly pressing against the concrete of the base plate 3 and causing localized damage.

[0041] Combination Figures 1 to 8 As shown, a cast-in-place box girder concrete pouring counter-pressure process, using the aforementioned cast-in-place box girder concrete pouring counter-pressure device, is characterized by comprising the following steps: S1: Place the pressure plate 1 on the base plate 3, so that the blocking surface 7 on one side of the pressure plate 1 is tightly fitted with the bottom outer side of the web plate 4, and the bottom edge of the blocking surface 7 is aligned with the seam line of the web plate 4 and the base plate 3. The pressure plate 1 is then pressed and fixed onto the base plate 3 by the clamping member 2. S2: Concrete is poured into the formwork of web 4, and web 4 undergoes outward expansion deformation under the lateral pressure of the concrete: S3: The outward expansion of the web 4 pushes the sealing block 5 to trigger the pressure applying element 6. The pressure applying element 6 continuously provides a holding force towards the web 4, keeping the blocking surface 7 in close contact with the web 4 and preventing grout from leaking out from the joint seam. S4: After the concrete inside the web plate 4 has solidified, release the clamping member 2 and remove the pressure plate 1.

[0042] In this embodiment, combined with Figures 4 to 6 as well as Figure 8 As shown, the sealing block 5 and the pressure-applying component 6 are staggered. When the web 4 expands outward, the pressure-applying component 6 moves automatically toward the web 4 under the linkage of the sealing block 5, increasing the contact pressure between the blocking surface 7 and the web 4.

[0043] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A counter-pressure device for cast-in-place box girder concrete pouring, comprising a base plate (3) and a web plate (4) assembled on the base plate (3), characterized in that, It also includes a pressure plate (1), on which a clamping member (2) is installed. The clamping member (2) causes the pressure plate (1) to abut against the bottom plate (3). One side of the pressure plate (1) is a top surface and multiple sealing blocks (5) and pressure-applying members (6) are arranged in an array along its length. The sealing blocks (5) and the pressure-applying members (6) are staggered. The sealing blocks (5) and the pressure-applying members (6) form a blocking surface (7). The blocking surface (7) contacts the web plate (4) and its bottom edge is located at the junction seam of the web plate (4) and the bottom plate (3). The pressure-applying members (6) continuously provide a holding force toward the web plate (4).

2. The cast-in-place box girder concrete pouring counter-pressure device according to claim 1, characterized in that, The pressure-applying component (6) includes a lower edge plate (601) constructed on the pressure plate (1), the lower edge plate (601) being flush with the bottom of the pressure plate (1), a guide plate (602) being constructed on the pressure plate (1) above the lower edge plate (601), a connecting cylinder (603) being slidably fitted on the guide plate (602), a pressure plate (604) being constructed at the free end of the connecting cylinder (603), the bottom of the pressure plate (604) being flush with the pressure plate (1), when the pressure plate (604) contacts the end of the lower edge plate (601), the side of the pressure plate (604) away from the corresponding guide plate (602) being flush with the sealing block (5), a transmission component (8) being installed on the sealing block (5), when grouting is performed in the web (4), the transmission component (8) provides a holding force to the pressure plate (604) in the direction of the corresponding web (4).

3. The cast-in-place box girder concrete pouring counter-pressure device according to claim 2, characterized in that, The transmission component (8) includes a touch plate (801) that is horizontally slidably mounted on one side of the sealing block (5). The sealing block (5) is equipped with a linkage assembly (9) that acts on the touch plate (801) and the pressure plate (604). When the blocking surface (7) contacts the web plate (4), the touch plate (801) simultaneously contacts the corresponding web plate (4). When the touch plate (801) floats away from the web plate (4), the linkage assembly (9) provides a force to the pressure plate (604) in the direction of the web plate (4).

4. The cast-in-place box girder concrete pouring counter-pressure device according to claim 3, characterized in that, The linkage assembly (9) includes a guide rod (901) vertically mounted on the sealing block (5), a sliding plate (902) vertically slidingly mounted on the guide rod (901), a transmission block (903) mounted at one end of the sliding plate (902), a limit block (904) mounted on the top of the guide rod (901), a return spring (905) mounted between the guide plate (602) and the connecting cylinder (603), a first inclined surface (906) and a second inclined surface (907) mounted on the transmission block (903), one side of the actuating plate (801) contacting the first inclined surface (906), and one side of the pressure plate (604) contacting the second inclined surface (907).

5. The cast-in-place box girder concrete pouring counter-pressure device according to claim 1, characterized in that, The pressure plate (1) has a plurality of through holes (201) arranged in a linear array. The clamping member (2) includes a pull rod (202) movably inserted into the through hole (201). One end of the pull rod (202) is inserted into the base plate (3). A clamping member (203) is slidably sleeved on the pull rod (202). The clamping member (2) also includes a steel pipe (204) placed on the pressure plate (1). A tightening nut (205) is screwed into the pull rod (202).

6. The cast-in-place box girder concrete pouring counter-pressure device according to claim 5, characterized in that, The clamping element (203) is a butterfly buckle, and there are two steel pipes (204), both of which are in contact with the butterfly buckle.

7. The cast-in-place box girder concrete pouring counter-pressure device according to claim 6, characterized in that, A plastic tube (10) is pre-embedded in the base plate (3), and one end of the pull rod (202) passes through the plastic tube (10) and is connected to a locking member (11).

8. The cast-in-place box girder concrete pouring counter-pressure device according to claim 7, characterized in that, The locking component (11) includes a pad (1101) and a locking nut (1102). One end of the pull rod (202) passes through the plastic tube (10) and the pad (1101) is sleeved on the pull rod (202). The pad (1101) is in contact with the bottom surface of the base plate (3). The locking nut (1102) is screwed into the pull rod (202) and pressed against the pad (1101).

9. A reverse pressure process for cast-in-place box girder concrete pouring, using the reverse pressure device for cast-in-place box girder concrete pouring as described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Place the pressure plate (1) on the base plate (3) so that the blocking surface (7) on one side of the pressure plate (1) is tightly fitted to the outer bottom of the web plate (4) and the bottom edge of the blocking surface (7) is aligned with the seam of the web plate (4) and the base plate (3). The pressure plate (1) is pressed and fixed to the base plate (3) by the clamping member (2). S2: Concrete is poured into the web (4) template, and the web (4) undergoes outward expansion deformation under the action of the concrete lateral pressure: S3: The outward expansion of the web (4) pushes the sealing block (5) to trigger the pressure application element (6), which continuously provides a holding force towards the web (4), so that the blocking surface (7) remains in close contact with the web (4), preventing the grout from leaking out from the joint seam: S4: After the concrete inside the web plate (4) has solidified, release the clamping member (2) and remove the pressure plate (1).

10. The cast-in-place box girder concrete pouring counter-pressure process according to claim 9, characterized in that, The sealing block (5) and the pressure-applying component (6) are staggered. When the web (4) expands outward, the pressure-applying component (6) moves automatically toward the web (4) under the linkage of the sealing block (5), increasing the contact pressure between the blocking surface (7) and the web (4).

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