A steel end formwork for pouring concrete for the second lining of a tunnel

Abstract

The utility model provides a kind of steel end template of tunnel secondary lining concrete pouring, including end template piece and connecting seat, the end template piece includes inner end plate, middle end plate, outer end plate and two groups of crosspiece assembly;Crosspiece assembly includes connecting shaft and the two groups of end plate part connecting ears fixed on connecting seat along the distribution of connecting shaft extension direction, shaft is simultaneously arranged in connecting shaft and a group of end plate part connecting ears, stop screw is simultaneously arranged in connecting shaft and another group of end plate part connecting ear two The connecting ear part through-hole is connected together after same stop nut, connecting shaft is simultaneously arranged in inner end plate part connecting hole, middle end plate part connecting hole and outer end plate part connecting hole, the inner end plate part locking bolt, middle end plate part locking bolt and outer end plate part locking bolt all abut on the connecting shaft.The utility model has the advantages of no need to build twice, solve the problem of time-consuming that existing pouring tunnel secondary lining end template needs to build on site each time.

Description

Technical Field

[0001] This utility model relates to the field of tunnel construction technology, and in particular to a steel end formwork for pouring secondary concrete in tunnels. Background Technology

[0002] In tunnel construction, the secondary lining is a reinforced concrete structure, and concrete pouring is a crucial construction step. This requires setting up a formwork trolley to erect the bottom formwork, which shapes the inner circumference of the tunnel lining. An arc-shaped waterproof membrane is laid on the inner circumference of the tunnel lining. One end of the bottom formwork overlaps with the already poured secondary lining to seal it, while the other end needs to be sealed with an end formwork to enclose the concrete pouring space. Currently, end formwork is mostly assembled on-site manually using materials such as wooden strips and plastic strips. The installation and dismantling of end formwork is cumbersome, consuming a lot of time and manpower, reducing construction efficiency. The current steel end formwork is a fixed structure, and there are gaps of varying sizes between its edges and the waterproof membrane on the tunnel lining surface, as well as gaps between it and the waterstop strip within the tunnel lining, leading to grout leakage during concrete pouring. Utility Model Content

[0003] The first objective of this invention is to provide a steel end formwork for pouring tunnel secondary lining concrete that does not require secondary construction, thus solving the problem of time-consuming on-site construction of existing tunnel secondary lining end formwork each time.

[0004] The second objective of this invention is to provide a steel end formwork for pouring tunnel secondary lining concrete with good sealing performance, thus solving the problem of grout leakage in existing tunnel secondary lining end formwork.

[0005] To achieve the above objectives, this utility model employs the following technology: a steel end template for tunnel secondary lining concrete pouring, characterized in that it comprises an end template piece and a connecting seat; the end template piece includes an inner end plate, a middle end plate, an outer end plate, and two sets of crossbar assemblies; the inner end plate is provided with an inner end plate connecting ear, the inner end plate connecting ear is provided with an inner end plate connecting hole, the inner end plate connecting hole is provided with an inner end plate threaded hole penetrating the surface of the inner end plate connecting ear, and an inner end plate locking bolt is internally threaded into the inner end plate threaded hole; the middle end plate is provided with a middle end plate connecting ear, the middle end plate connecting ear is provided with a middle end plate connecting hole, the middle end plate connecting hole is provided with a middle end plate threaded hole penetrating the surface of the middle end plate connecting ear, and a middle end plate locking bolt is threaded into the middle end plate threaded hole; the outer end plate is provided with an outer end plate connecting ear, the outer end plate connecting ear is provided with an outer end plate connecting hole. The assembly includes a threaded hole in the outer end plate connecting lug that passes through the surface of the outer end plate, and a locking bolt is threaded into the threaded hole. The crossbar assembly includes a connecting shaft and two sets of end plate connecting lugs distributed along the extension direction of the connecting shaft. The end plate connecting lugs are fixed on the connecting seat. Each set of end plate connecting lugs includes two end plate connecting lugs distributed perpendicular to the connecting shaft. The end plate connecting lugs are provided with connecting lug through holes. The rotating shaft passes through both the connecting shaft and the two connecting lug through holes of one set of end plate connecting lugs. The anti-rotation screw passes through both the connecting shaft and the two connecting lug through holes of the other set of end plate connecting lugs and is then connected to the anti-loosening nut. The connecting shaft passes through the inner end plate connecting hole, the middle end plate connecting hole, and the outer end plate connecting hole. The inner end plate locking bolt, the middle end plate locking bolt, and the outer end plate locking bolt all abut against the connecting shaft.

[0006] Preferably, the middle end plate and the outer end plate overlap each other, which allows for adaptation to changes in radial dimensions.

[0007] Preferably, the inner end plate has storage through holes distributed along the vertical direction. A transparent partition plate is located at one end of each storage through hole on the connecting shaft, creating a storage cavity within the storage through hole. The pouring height of the concrete can be observed through the partition plate during pouring.

[0008] Preferably, the storage through-hole has a small-diameter section at one end of the connecting shaft, forming a support step. The isolation plate is supported on the support step and can be removably installed inside the storage hole. A transparent protective film is peelably covered on the side of the isolation plate away from the small-diameter section. After pouring, the concrete flowing into the storage hole is pushed out by pushing the isolation plate away from the support step. Then, the protective film is peeled off, a new protective film is applied, and the isolation plate is reinstalled into the storage through-hole. This allows for clear observation of the isolation plate even during repeated use.

[0009] Preferably, the storage cavity contains phenolphthalein powder. When the concrete is poured to the height of the storage cavity, it will turn red upon contact with the phenolphthalein powder. This allows for more convenient and reliable observation of the concrete.

[0010] Preferably, the outer end plate is provided with an adaptive sealing structure that seals the outer end plate and the waterproof membrane together. The adaptive sealing structure includes an arc-shaped elastic sealing strip, an elastic connecting sleeve that seals the elastic strip to the outer end plate, and several cylinders disposed within the outer end plate. A piston is slidably and sealingly connected within each cylinder. The piston is connected to the elastic sealing strip via a piston rod, which passes through the elastic connecting sleeve. The elastic sealing strip is pressed against the waterproof membrane by the piston rod. The diameter of the circle containing the elastic sealing strip is larger than the diameter of the circle containing the waterproof membrane. The piston isolates the cylinder into a rod-type chamber and a rodless chamber. All piston rods are distributed circumferentially along the waterproof membrane. This design enables a reliable seal with the outer end plate even when the curvature of the inner circumference of the tunnel lining differs, achieving the second objective of the utility model.

[0011] Preferably, the elastic sealing strip has an elastic sealing layer on the surface of the side in contact with the waterproof plate. All cylinder rod chambers are connected to the first fluid inlet / outlet, and rodless chambers are connected to the second fluid inlet / outlet. This improves sealing reliability. During sealing, pressurized fluid is introduced through the second fluid inlet, while fluid in the rod chamber flows out through the first fluid inlet / outlet. When releasing the seal and removing the outer end plate, pressurized fluid is introduced through the first fluid inlet, while fluid in the rod chamber flows out through the second fluid inlet / outlet.

[0012] Preferably, all the cylinders are radially distributed along the bottom template, and one end of the rod chamber is provided with a clearance channel for the piston rod to pass through. The piston rod is sealed to the end wall of the clearance channel away from the piston. This allows for a large piston area in each cylinder within a limited space, thus enabling each cylinder to withstand greater forces.

[0013] Beneficial effects: When used twice, the end formwork does not need to be rebuilt, saving time and effort; the sealing effect is good, it is not easy to leak grout, and it can be conveniently located for concrete pouring. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the usage state of Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the cross-section of the inner end plate; Figure 3 This is a partial schematic diagram of Embodiment 2 of the present invention.

[0015] In the diagram: 1. Bottom template; 2. Waterproof board; 3. Waterstop strip; 4. End template piece; 5. Connecting seat; 6. Inner end plate; 7. Middle end plate; 8. Outer end plate; 10. Connecting ear of inner end plate; 11. Locking bolt of inner end plate; 13. Locking bolt of middle end plate; 14. Connecting ear of outer end plate; 15. Connecting shaft; 16. Connecting ear of end plate; 17. Rotating shaft; 18. Anti-rotation screw; 19. Anti-loosening nut; 20. Storage through hole; 21. Isolation plate; 22. Storage hole; 23. Support step; 24. Protective membrane; 25. Elastic sealing strip; 33. Elastic connecting sleeve; 34. Cylinder body; 35. Piston; 36. Piston rod; 37. Rod chamber; 38. Rodless chamber; 39. Elastic sealing layer; 40. First fluid inlet / outlet; 41. Second fluid inlet / outlet; 42. Clearance passage; 43. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1, see Figure 1 and Figure 2A steel end formwork for pouring concrete for tunnel secondary lining includes end formwork pieces 4 and connecting seats 5. Multiple connecting seats or one movable connecting seat can be installed on the end face of the bottom formwork 1. The bottom formwork is used to shape the inner circumferential surface of the tunnel secondary lining. The end formwork piece includes an inner end plate 6, a middle end plate 7, an outer end plate 8, and two sets of crossbar assemblies distributed circumferentially along the bottom formwork. Inner end plates, middle end plates, and outer end plates are radially distributed along the bottom template. The inner end plate has an inner end plate connecting lug 10, which has an inner end plate connecting hole. The inner end plate connecting hole has an inner end plate threaded hole that penetrates the surface of the inner end plate connecting lug, and an inner end plate locking bolt 11 is threaded into the inner end plate threaded hole. The middle end plate has a middle end plate connecting lug 12, which has a middle end plate connecting hole. The middle end plate connecting hole has a middle end plate threaded hole that penetrates the surface of the middle end plate connecting lug, and a middle end plate locking bolt 13 is threaded into the middle end plate threaded hole. The outer end plate has an outer end plate connecting lug 14, which has an outer end plate connecting hole. The outer end plate connecting hole has an outer end plate threaded hole that penetrates the surface of the outer end plate connecting lug, and an outer end plate locking bolt 13 is threaded into the outer end plate threaded hole. The end plate locking bolt 15; the crossbar assembly includes a connecting shaft 16 and two sets of end plate connecting ears 17 distributed along the extension direction of the connecting shaft. The end plate connecting ears are fixed on the connecting seat. Each set of end plate connecting ears includes two end plate connecting ears distributed perpendicular to the direction of the connecting shaft. The end plate connecting ears are provided with connecting ear through holes. The rotating shaft 18 passes through both the connecting shaft and the two connecting ear through holes of one set of end plate connecting ears. The anti-rotation screw 19 passes through both the connecting shaft and the two connecting ear through holes of the other set of end plate connecting ears and is then connected together with the anti-loosening nut 20. The connecting shaft passes through the inner end plate connecting hole, the middle end plate connecting hole, and the outer end plate connecting hole. The inner end plate locking bolt, the middle end plate locking bolt, and the outer end plate locking bolt all abut against the connecting shaft. In use, the inner end plate and the middle end plate clamp the waterstop 3. The outer end plate abuts against the waterproof membrane 2, and an arc-shaped waterproof membrane 2 is laid on the inner circumference of the tunnel lining (only a portion is shown schematically in the figure). Waterstop 3 (only a portion is shown schematically in the figure as well).The process of pouring the secondary lining of the tunnel is as follows: A. After pouring the first section of the secondary lining, connect multiple connecting seats with end plates and connecting ears distributed circumferentially along the bottom formwork to the end face of the bottom formwork; B. Move the trolley to the end of the bottom formwork furthest from the connecting seats and overlap it on the poured secondary lining section, so that the two connecting shafts are connected to the connecting seats located at both ends of the bottom formwork circumferentially; C. Form a local cavity in the secondary lining of the tunnel: rotate the connecting shaft around the pivot until the inner end plate overlaps the end face of the bottom formwork or the connecting seat, so that the outer end plate is in contact with the waterproofing. The plates are sealed together, and after the anti-rotation screws are inserted, the anti-loosening nuts are tightened to prevent the connecting shaft from rotating. The end template, bottom template, tunnel lining, and the poured secondary tunnel lining form a partial cavity for the secondary tunnel lining. D. Concrete is poured into the partial cavity for the secondary tunnel lining and cured to form a partial section of the secondary tunnel lining. E. The connecting shaft is removed and connected to the connecting seat adjacent to the poured secondary tunnel lining section. Repeat C to D to pour the second partial section of the same secondary tunnel lining section. Repeat C to E to complete the pouring of one secondary tunnel lining joint. Repeat B to E to complete the pouring of all secondary tunnel lining joints.

[0018] The middle end plate and the outer end plate overlap. The inner end plate has storage through-holes 21 distributed vertically. A transparent partition plate 22 is located at one end of the storage through-hole on the connecting shaft, creating a storage cavity 23 within the storage through-hole. A small-diameter section forms a support step 24 at one end of the storage through-hole on the connecting shaft. The partition plate is supported on the support step and can be removably installed within the storage cavity. A transparent protective film 25 is peelably applied to the side of the partition plate away from the small-diameter section. Phenolphthalein powder is stored within the storage cavity.

[0019] Example 2 differs from Example 1 in that: See Figure 3The outer end plate is provided with an adaptive sealing structure 32 that seals the outer end plate and the waterproof plate together. The adaptive sealing structure includes an arc-shaped elastic sealing strip 33, an elastic connecting sleeve 34 that seals the elastic strip with the outer end plate, and several cylinders 35 disposed within the outer end plate. A piston 36 is slidably and sealingly connected within the cylinder. The piston is connected to the elastic sealing strip via a piston rod 37, which passes through the elastic connecting sleeve. The elastic sealing strip is pressed against the waterproof plate by the piston rod. The diameter of the circle containing the elastic sealing strip is larger than the diameter of the circle containing the waterproof plate. The piston isolates the cylinder into a rod chamber 38 and a rodless chamber 39. All piston rods are distributed circumferentially along the waterproof plate. An elastic sealing layer 40 is provided on the surface of the elastic sealing strip that contacts the waterproof plate. The rod chambers of all cylinders are connected to the first fluid inlet / outlet 41, and the rodless chambers are connected to the second fluid inlet / outlet 42. All the cylinders are radially distributed along the bottom template. One end of the rod chamber is provided with a clearance channel 43 for the piston rod to pass through. The piston rod is sealed to the end wall of the clearance channel away from the piston.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A steel end formwork for pouring concrete for the secondary lining of a tunnel, characterized in that, The system includes end template pieces and connecting seats. The end template pieces include an inner end plate, a middle end plate, an outer end plate, and two sets of crossbar assemblies. The inner end plate has an inner end plate connecting lug, an inner end plate connecting hole, and an inner end plate threaded hole that penetrates the surface of the inner end plate connecting lug. An inner end plate locking bolt is threaded into the inner end plate threaded hole. The middle end plate has a middle end plate connecting lug, a middle end plate connecting hole, and a middle end plate threaded hole that penetrates the surface of the middle end plate connecting lug. A middle end plate locking bolt is threaded into the middle end plate threaded hole. The outer end plate has an outer end plate connecting lug, an outer end plate connecting hole, and an outer end plate threaded hole that penetrates the surface of the outer end plate connecting lug. The end plate has a threaded hole for threaded connection to an outer end plate locking bolt. The crossbar assembly includes a connecting shaft and two sets of end plate connecting ears distributed along the extension direction of the connecting shaft. The end plate connecting ears are fixed on the connecting seat. Each set of end plate connecting ears includes two end plate connecting ears distributed perpendicular to the connecting shaft. The end plate connecting ears are provided with connecting ear through holes. The rotating shaft passes through both the connecting shaft and the two connecting ear through holes of one set of end plate connecting ears. The anti-rotation screw passes through both the connecting shaft and the two connecting ear through holes of the other set of end plate connecting ears and is then connected together with the anti-loosening nut. The connecting shaft passes through the inner end plate connecting hole, the middle end plate connecting hole, and the outer end plate connecting hole. The inner end plate locking bolt, the middle end plate locking bolt, and the outer end plate locking bolt all abut against the connecting shaft.

2. The steel end formwork for casting secondary concrete in a tunnel according to claim 1, characterized in that, The middle end plate and the outer end plate are joined together.

3. A steel end formwork for casting secondary concrete in a tunnel according to claim 1 or 2, characterized in that, The inner end plate is provided with storage through holes distributed in the vertical direction. A transparent isolation plate is provided at one end of the storage through hole on the connecting shaft, and the isolation plate isolates the storage hole in the storage through hole.

4. A steel end formwork for pouring secondary concrete in a tunnel according to claim 3, characterized in that, The storage through hole has a small diameter section at one end of the connecting shaft to form a support step. The isolation plate is supported on the support step and can be removed and installed in the storage through hole. The side of the isolation plate away from the small diameter section is peelably covered with a transparent protective film.

5. A steel end formwork for casting secondary concrete in a tunnel according to claim 3, characterized in that, The storage cavity contains phenolphthalein powder.

6. A steel end formwork for casting secondary concrete in a tunnel according to claim 1, characterized in that, The outer end plate is provided with an adaptive sealing structure that seals the outer end plate and the waterproof plate together. The adaptive sealing structure includes an arc-shaped elastic sealing strip, an elastic connecting sleeve that seals the elastic strip with the outer end plate, and several cylinders disposed inside the outer end plate. A piston is slidably and sealingly connected inside the cylinder. The piston is connected to the elastic sealing strip through a piston rod. The piston rod passes through the elastic connecting sleeve. The elastic sealing strip is pressed against the waterproof plate through the piston rod. The diameter of the circle containing the elastic sealing strip is larger than the diameter of the circle containing the waterproof plate. The piston isolates the cylinder into a rod-type chamber and a rodless chamber. All piston rods are distributed along the circumference of the waterproof plate.

7. A steel end formwork for casting secondary concrete in a tunnel according to claim 6, characterized in that, The elastic sealing strip has an elastic sealing layer on the side surface that contacts the waterproof plate. All cylinders have rod chambers that are connected to the first fluid inlet and outlet, and rodless chambers that are connected to the second fluid inlet and outlet.

8. A steel end formwork for casting secondary concrete in a tunnel according to claim 6 or 7, characterized in that, All the cylinders are radially distributed along the bottom template. One end of the rod chamber is provided with a clearance channel for the piston rod to pass through. The piston rod is sealed together with the end wall of the clearance channel away from the piston.

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