Wet joint cast-in-place formwork system

Abstract

The present invention discloses a cast-in-place formwork system for wet joints, which includes a bearing mechanism, a formwork, an elastic sealing strip and a tightening device. The bearing mechanism is installed on a precast member, and the formwork covers the joint between two adjacent precast members to bear the cast-in-place concrete. The elastic sealing strip is arranged between the formwork and the precast member, and sealing strips are provided on both sides of the joint. The tightening device is installed on the bearing mechanism and supports the formwork. The tightening device can be compressed and deformed to generate a uniform tightening force on the formwork. In the above cast-in-place formwork system for wet joints, the formwork and the concrete are always in close contact during the process of casting concrete, avoiding the occurrence of gaps between the formwork and the precast concrete and thus preventing grout leakage, and ensuring the casting quality and appearance. The sealing strip can be compressed and deformed under force, adapting to various uneven concrete surfaces and preventing the formwork from being disengaged from the concrete.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly relates to a cast-in-place formwork system for wet joints. Background Art

[0002] A wet joint refers to a joint where precast prestressed concrete beam blocks are joined together with cast-in-place concrete when assembled into a long-span continuous beam by cantilever erection. Currently, to improve the construction quality and installation progress of bridges, large-scale concrete beams are precast into single beams in a precast yard and then connected into a whole by wet joints after being transported to the site for installation.

[0003] When casting the wet joint on-site, the formwork is installed with formwork below, cross beams are arranged above and below, and the formwork is pulled by tie rods. However, due to problems such as uneven lower surfaces of precast concrete structures, inconsistent step heights, inclined concrete surfaces, and easy relaxation of tie rods, there are gaps between the formwork and the precast concrete surface, and leakage of mortar often occurs during the concrete pouring process, affecting the pouring quality and appearance. Summary of the Invention

[0004] Based on this, it is necessary to provide a cast-in-place formwork system for wet joints to address the problem of gaps between the formwork and the precast concrete surface and frequent mortar leakage during the concrete pouring process.

[0005] A cast-in-place formwork system for wet joints includes:

[0006] A bearing mechanism installed on a precast member;

[0007] A formwork disposed in contact with the lower surface of the precast member, and the formwork covers the joint between two adjacent precast members to bear the cast-in-place concrete;

[0008] An elastic sealing strip disposed between the formwork and the precast member, and the sealing strip is provided on both sides of the joint; and

[0009] A jacking device installed on the bearing mechanism and supporting the formwork, and the jacking device can be compressed and deformed to generate a uniform jacking force on the formwork.

[0010] In one embodiment, the bearing mechanism includes an upper cross beam, a lower cross beam and tie rods. The upper cross beam is borne on the upper surface of the precast member, the lower cross beam is located below the precast member, the tie rods connect the upper cross beam and the lower cross beam, and the jacking device is installed on the lower cross beam.

[0011] In one embodiment, the bearing mechanism further includes cushion blocks. The cushion blocks are disposed on the upper surface of the precast member. The cushion blocks are provided on both sides of the joint, and the two ends of the upper cross beam are respectively borne on the two cushion blocks.

[0012] In one embodiment, the sealing strip is provided with a plurality of convex ribs on the surface that fits the precast member, and the plurality of convex ribs are arranged at intervals in a direction away from the joint.

[0013] In one embodiment, the jacking device includes a base and an elastic deformation body. The base is installed on the bearing mechanism. The base is provided with a groove, and the elastic deformation body is installed in the groove. The elastic deformation body extends out of the groove to support the formwork.

[0014] In one embodiment, the elastic deformation body is a wavy body, and the wave height of the elastic deformation body supports the formwork.

[0015] In one embodiment, the base is provided with two groups of parallel grooves, and there are two groups of elastic deformation bodies. The two groups of elastic deformation bodies are respectively installed in the two groups of grooves, and the wave heights and wave valleys of the two groups of elastic deformation bodies are arranged alternately.

[0016] In one embodiment, the jacking device further includes upper limit pins. The upper limit pins are installed on the base, and a plurality of the upper limit pins are evenly arranged at intervals along the extending direction of the groove. The upper limit pins are located below the wave height of the elastic deformation body.

[0017] In one embodiment, the jacking device further includes lower limit pins. The lower limit pins are installed on the base, and a plurality of the lower limit pins are evenly arranged at intervals along the extending direction of the groove. The lower limit pins are located above the wave valley of the elastic deformation body.

[0018] In one embodiment, the base is further provided with a first sliding groove, and the first sliding groove extends along the extending direction of the groove. The upper limit pin is slidably installed in the first sliding groove;

[0019] The base is further provided with a second sliding groove, and the second sliding groove extends along the extending direction of the groove. The lower limit pin is slidably installed in the second limiting groove.

[0020] The above wet joint in-situ casting formwork system has at least the following advantages:

[0021] The bearing mechanism is installed on the precast component, and the jacking device is installed on the bearing mechanism and supports the formwork. The formwork covers the joint between two adjacent precast components, enabling the bearing of cast-in-place concrete, and the cast-in-place concrete realizes the connection of two adjacent precast components. The jacking device can be compressed and deformed to generate a uniform jacking force on the formwork, always keeping the formwork and the concrete in close contact during the concrete pouring process, avoiding the occurrence of slurry leakage due to the gap between the formwork and the precast concrete, and ensuring the pouring quality and appearance. The sealing strip can be compressed and deformed under force, adapting to various uneven concrete surfaces and preventing the formwork from being separated from the concrete. Description of the Drawings

[0022] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for the specific embodiments will be briefly introduced below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.

[0023] Figure 1 It is a cross-sectional view of the wet joint cast-in-place formwork system in one embodiment;

[0024] Figure 2 It is Figure 1 a side view of the wet joint cast-in-place formwork system shown;

[0025] Figure 3 It is Figure 1 a cross-sectional view of the jacking device in

[0026] Figure 4 It is Figure 1 a cross-sectional view of the sealing strip in

[0027] Figure 5 It is Figure 2 a schematic diagram of the first elastic deformation body before compression deformation in

[0028] Figure 6 It is Figure 2 a schematic diagram of the first elastic deformation body after compression deformation in

[0029] Figure 7 It is Figure 2 a schematic diagram of the second elastic deformation body before compression deformation in

[0030] Figure 8 It is Figure 2 a schematic diagram of the second elastic deformation body after compression deformation in

[0031] Figure 9 It is Figure 2 a schematic diagram of the upper limit pin and the lower limit pin slidably installed on the base in

[0032] Reference Numerals:

[0033] 1 - Prefabricated component, 2 - Joint, 3 - Concrete surface, 4 - Step, 10 - Bearing mechanism, 11 - Upper cross beam, 12 - Lower cross beam, 13 - Tie rod, 14 - Nut, 15 - Cushion block, 20 - Formwork, 30 - Sealing strip, 32 - Convex rib, 40 - Tightening device, 41 - Base, 411 - Groove, 42 - Elastic deformation body, 43 - Upper limit pin, 431 - First chute, 44 - Lower limit pin, 441 - Second chute. Detailed implementation manner

[0034] To make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific implementation manner of the present invention is made in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the invention is not limited by the specific implementations disclosed below.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] Please refer to Figure 1 and Figure 2 , A wet joint in-situ formwork system in an embodiment is used to be installed at the joint 2 of the prefabricated component 1 to realize the bearing of in-situ concrete. Specifically, the wet joint in-situ formwork system includes a bearing mechanism 10, a formwork 20, a sealing strip 30 and a tightening device 40.

[0038] The bearing mechanism 10 is installed on the prefabricated component 1, and the bearing mechanism 10 is used to bear the weights of the formwork 20, the tightening device 40 and the in-situ concrete. In an embodiment, the bearing mechanism 10 includes an upper cross beam 11, a lower cross beam 12 and a tie rod 13. The upper cross beam 11 bears on the upper surface of the prefabricated component 1, the lower cross beam 12 is located below the prefabricated component 1, and the tie rod 13 connects the upper cross beam 11 and the lower cross beam 12 to realize the suspension of the lower cross beam 12.

[0039] On the basis of the above embodiment, one end of the tie rod 13 passes through the lower cross beam 12 and is locked by the nut 14, and the other end of the tie rod 13 passes through the upper cross beam 11 and is locked by the nut 14. The two ends of the tie rod 13 are locked by the nuts 14 to achieve fixation with the upper cross beam 11 and the lower cross beam 12, and the height of the lower cross beam 12 can be adjusted as needed, and the jacking device 40 can be lifted to press the template 20.

[0040] On the basis of the above embodiment, the bearing mechanism 10 further includes a pad 15, which is arranged on the upper surface of the prefabricated component 1, and pads 15 are arranged on both sides of the joint 2 formed by two adjacent prefabricated components 1, and the two ends of the upper crossbeam 11 are respectively carried on the two pads 15. The pads 15 can ensure a certain gap between the upper crossbeam 11 and the prefabricated component 1, which is conducive to the pouring of concrete construction operation.

[0041] It is understandable that in other embodiments, the supporting mechanism 10 may also be other structures, as long as it can be installed on the prefabricated component 1 and provide a platform for the tightening device 40 to support the formwork 20.

[0042] The template 20 is arranged to fit the lower surface of the prefabricated component 1, the width of the template 20 is greater than the width of the joint 2, and the two sides of the template 20 partially overlap with the two prefabricated components 1, so that the template 20 covers the joint 2 between two adjacent prefabricated components 1. The template 20 can bear the weight of concrete during the on-site concrete pouring process and be removed after the concrete solidifies.

[0043] The sealing strip 30 is arranged between the template 20 and the prefabricated component 1, and the sealing strip 30 is arranged on both sides of the joint 2. The sealing strip 30 is elastic, and can be compressed and deformed after being subjected to force, so as to adapt to various uneven concrete surfaces 3, such as voids and unevenness, and prevent voids between the template 20 and the concrete. In one embodiment, the sealing strip 30 can be a rubber strip. Of course, the material of the sealing strip 30 can be specifically selected according to needs, such as silicone.

[0044] Please also read Figure 4 On the basis of the above embodiment, further, the surface of the sealing strip 30 that is in contact with the prefabricated component 1 is provided with a plurality of ridges 32, and the plurality of ridges 32 are arranged at intervals in a direction away from the joint 2. The plurality of ridges 32 can achieve multi-level sealing, thereby improving the sealing effect of the sealing strip 30 between the template 20 and the prefabricated component 1. Furthermore, the plurality of ridges 32 gradually increase in height in a direction away from the joint 2, and as they gradually move away from the joint 2, the sealing effect of the sealing strip 30 gradually increases, thereby ensuring the sealing effect.

[0045] Please refer again Figure 1The jacking device 40 is installed on the bearing mechanism 10, and the jacking device 40 supports the template 20. In one embodiment, the number of the jacking devices 40 is two, and the two jacking devices 40 are installed on the lower cross beam 12 at intervals. The two jacking devices 40 support the two ends of the template 20 respectively, and the positions of the two jacking devices 40 correspond to the positions of the two sealing strips 30 one by one.

[0046] Please also read Figure 2 and Figure 3 In one embodiment, the tightening device 40 includes a base 41 and an elastic deformable body 42, and the base 41 is installed on the bearing mechanism 10. Specifically in this embodiment, the base 41 is installed on the lower cross beam 12, and the base 41 is provided with a groove 411, and the groove 411 extends along the transverse bridge direction. The elastic deformable body 42 is installed in the groove 411, and the elastic deformable body 42 extends out of the groove 411 to support the template 20. Among them, the elastic deformable body 42 can be compressed and deformed to generate a uniform pre-tightening force on the template 20.

[0047] On the basis of the above embodiment, further, the elastic deformable body 42 is a wave body, the wave height of the elastic deformable body 42 supports the template 20, and the elastic deformable body 42 can be elastically compressed and moved up and down and left and right. In one embodiment, the elastic deformable body 42 is made of a thin steel plate, and the thin steel plate is bent to form a plurality of continuous wavy structures. Specifically, the wavy shape of the elastic deformable body 42 is a sine curve, and the length of the groove 411 is greater than the length of the elastic deformable body 42 to adapt to the elongation of the length of the elastic deformable body 42 after compression.

[0048] See also Figures 5 to 8 , where when the concrete has steps 4 with height differences, the wave height A of the elastic deformable body 42 at the lowest point of the concrete surface first contacts the concrete formwork 20. When the base 41 continues to rise, the wave height A will be compressed and deformed, causing the wave trough of the elastic deformable body 42 to move to both sides, raising the wave heights on both sides of the wave height A until it contacts the formwork 20. In the same principle, all the wave heights finally contact the formwork 20, and then the base 41 rises, and the entire elastic deformable body 42 is compressed and deformed, generating a uniform load on the entire length of the formwork 20, which can adapt to the different height differences of the concrete surface 3.

[0049] Please refer again Figure 2 and Figure 3 On the basis of the above embodiment, further, two groups of parallel grooves 411 are provided on the base 41, and two groups of elastic deformation bodies 42 are provided. The two groups of elastic deformation bodies 42 are respectively installed in the two groups of grooves 411, and the wave heights and wave troughs of the two groups of elastic deformation bodies 42 are arranged alternately. Among them, the wave heights and wave troughs of the two elastic deformation bodies 42 are arranged alternately, which can increase the number of loading points and make the template 20 more evenly stressed.

[0050] In one embodiment, the pressing device 40 further includes an upper limit pin 43. The upper limit pin 43 is installed on the base 41, and a plurality of upper limit pins 43 are evenly spaced along the extending direction of the groove 411. The upper limit pin 43 is located below the wave height of the elastic deformable body 42. Among them, the upper limit pin 43 can prevent the wave height of the elastic deformable body 42 from being too low at some positions, ensuring that the height of the overall continuous wave body is within a certain range.

[0051] On the basis of the above embodiment, further, the upper limit pin 43 penetrates through two grooves 411 on the base 41, and the number of the upper limit pins 43 is twice the number of the wave heights of the elastic deformable body 42, so that the upper limit pin 43 can support all the wave heights of the two elastic deformable bodies 42.

[0052] That is to say, for two adjacent upper limit pins 43, one upper limit pin 43 is located below the wave height of the first elastic deformable body 42, and the other upper limit pin 43 is located below the wave height of the second elastic deformable body 42. The wave height of the first elastic deformable body 42 is adjacent to the wave height of the second elastic deformable body 42.

[0053] Please refer to Figure 9 , on the basis of the above embodiment, a first sliding groove 431 is formed on the base 41. The first sliding groove 431 is arranged on the side wall of the groove 411 and extends along the extending direction of the groove 411. The upper limit pin 43 is slidably installed in the first sliding groove 431. Among them, during the process of compression deformation of some wave heights of the elastic deformable body 42, the wave valleys of the elastic deformable body 42 will move to both sides, and the positions of other wave heights will change. At this time, the side walls on both sides of the wave height will contact the upper limit pin 43, pushing the upper limit pin 43 to move with the wave height, so as to keep the upper limit pin 43 located below the wave height and be able to support the wave height when the wave height is too low.

[0054] In one embodiment, the pressing device 40 further includes a lower limit pin 44. The lower limit pin 44 is installed on the base 41, and a plurality of lower limit pins 44 are evenly spaced along the extending direction of the groove 411. The lower limit pin 44 is located above the wave valley of the elastic deformable body 42. Among them, the lower limit pin 44 can prevent the wave valley of the elastic deformable body 42 from being overly deformed upward. At the same time, a certain gap is reserved between the lower limit pin 44 and the bottom surface of the groove 411, enabling the wave valley of the elastic deformable body 42 to move freely left and right.

[0055] On the basis of the above embodiments, further, the lower limit pins 44 penetrate through two grooves 411 on the base 41, and the number of the lower limit pins 44 is twice the number of the wave troughs of the elastic deformable body 42, so that the lower limit pins 44 can limit all the wave troughs of the two elastic deformable bodies 42. That is to say, for two adjacent lower limit pins 44, one lower limit pin 44 is located above the wave trough of the first elastic deformable body 42, and the other lower limit pin 44 is located above the wave trough of the second elastic deformable body 42, and the wave trough of the first elastic deformable body 42 is adjacent to the wave trough of the second elastic deformable body 42.

[0056] On the basis of the above embodiments, a second chute 441 is formed on the base 41, the second chute 441 is arranged on the side wall of the groove 411, the second chute 441 extends along the extending direction of the groove 411, and the lower limit pin 44 is slidably installed in the second chute 441. Wherein, during the process of compression deformation of some wave heights of the elastic deformable body 42, the wave troughs of the elastic deformable body 42 will move to both sides, and the positions of the wave troughs will change. At this time, the side walls on both sides of the wave trough will contact the lower limit pin 44, and push the lower limit pin 44 to move with the wave trough, so as to keep the lower limit pin 44 located above the wave trough and be able to limit the wave trough when the position of the wave trough is too high.

[0057] In one embodiment, both the upper limit pin 43 and the lower limit pin 44 are metal round steel. It can be understood that in other embodiments, the upper limit pin 43 and the lower limit pin 44 can be made of other materials and in other ways, which are not limited herein.

[0058] The specific method for using the above wet joint in-situ casting formwork system is as follows:

[0059] Please refer to Figure 1 and Figure 2 , after the precast member 1 is made on site, it is moved to the site for installation, and a joint 2 is formed between adjacent precast members 1. Two cushion blocks 15 are respectively arranged on two adjacent precast members 1, and then the two ends of the upper cross beam 11 are respectively borne on the two cushion blocks 15.

[0060] Install the formwork 20 on the jacking device 40, and then install the sealing strip 30 on the formwork 20. One end of the tie rod 13 is fixed on the upper cross beam 11 through a nut 14, and then the other end of the tie rod 13 passes through the lower cross beam 12 and is locked and fixed through a nut 14.

[0061] Gradually tighten the nut 14 on the upper cross beam 11, the upper cross beam 11 rises, the jacking device 40 is compressed and deformed, and a uniform jacking force is generated on the formwork 20. After the sealing strip 30 is stressed, it can be compressed and deformed to adapt to various uneven concrete surfaces 3 and prevent the formwork 20 from being separated from the concrete.

[0062] Please refer to Figures 5 to 8, wherein when there is a height difference in the concrete step 4, the wave height A of the elastic deformable body 42 at the lowest point of the concrete surface first contacts the formwork 20. When the base 41 continues to rise, the wave height A will be compressed and deformed, causing the wave trough of the elastic deformable body 42 to move to both sides, raising the wave heights on both sides of the wave height A until they contact the formwork 20. By the same principle, finally all wave heights contact the formwork 20. When the base 41 rises further, the entire elastic deformable body 42 is compressed and deformed, generating a uniform load on the entire length of the formwork 20, which can adapt to the problem of different height differences on the concrete surface 3.

[0063] The upper limit pin 43 moves along with the wave height. The upper limit pin 43 prevents some wave heights from being too low, ensuring that the height of the overall continuous wave body is within a certain range. The lower limit pin 44 moves along with the wave trough. The lower limit pin 44 prevents some wave troughs from being too high.

[0064] The above wet joint cast-in-place formwork system can adapt to various uneven concrete surfaces 3 and prevent the formwork 20 from becoming disengaged from the concrete. During the process of pouring concrete, the jacking device 40 always makes the formwork 20 and the concrete in close contact, avoiding the existence of gaps between the formwork 20 and the precast concrete and thus preventing slurry leakage, and ensuring the pouring quality and appearance.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A cast-in-place formwork system for wet joints, characterized in that, it includes: a bearing mechanism installed on a precast member; a formwork disposed in contact with the lower surface of the precast member, the formwork covering the joint between two adjacent precast members to bear the cast-in-place concrete; an elastic sealing strip disposed between the formwork and the precast member, and the sealing strips are provided on both sides of the joint; and a jacking device installed on the bearing mechanism and supporting the formwork, the jacking device being compressibly deformable to generate a uniform jacking force on the formwork; the jacking device includes a base and an elastic deformation body, the base is installed on the bearing mechanism, the base is provided with a groove, the elastic deformation body is installed in the groove, and the elastic deformation body extends out of the groove to support the formwork; the elastic deformation body is a wavy body, the wave height of the elastic deformation body supports the formwork, and the length of the groove is greater than the length of the elastic deformation body.

2. The cast-in-place formwork system for wet joints according to claim 1, characterized in that, the bearing mechanism includes an upper cross beam, a lower cross beam and a tie rod, the upper cross beam bears on the upper surface of the precast member, the lower cross beam is located below the precast member, the tie rod connects the upper cross beam and the lower cross beam, and the jacking device is installed on the lower cross beam.

3. The cast-in-place formwork system for wet joints according to claim 2, characterized in that, the bearing mechanism further includes cushion blocks, the cushion blocks are disposed on the upper surface of the precast member, the cushion blocks are provided on both sides of the joint, and the two ends of the upper cross beam respectively bear on the two cushion blocks.

4. The cast-in-place formwork system for wet joints according to claim 1, characterized in that, the sealing strip is provided with a plurality of convex ribs on the surface in contact with the precast member, and the plurality of convex ribs are arranged at intervals in a direction away from the joint.

5. The cast-in-place formwork system for wet joints according to claim 1, characterized in that, the base is provided with two groups of parallel grooves, there are two groups of elastic deformation bodies, the two groups of elastic deformation bodies are respectively installed in the two groups of grooves, and the wave heights and wave valleys of the two groups of elastic deformation bodies are arranged alternately.

6. The cast-in-place formwork system for wet joints according to claim 5, characterized in that, the jacking device further includes upper limit pins, the upper limit pins are installed on the base, and a plurality of the upper limit pins are evenly arranged at intervals along the extending direction of the groove, and the upper limit pins are located below the wave height of the elastic deformation body.

7. The cast-in-place formwork system for wet joints according to claim 6, characterized in that, the jacking device further includes lower limit pins, the lower limit pins are installed on the base, and a plurality of the lower limit pins are evenly arranged at intervals along the extending direction of the groove, and the lower limit pins are located above the wave valley of the elastic deformation body.

8. The cast-in-place formwork system for wet joints according to claim 7, characterized in that, The base is further provided with a first sliding groove, the first sliding groove extends along the extending direction of the groove, and the upper limit pin is slidably installed in the first sliding groove; the base is further provided with a second sliding groove, the second sliding groove extends along the extending direction of the groove, and the lower limit pin is slidably installed in the second sliding groove.

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