Pipe jacking working well reverse building method construction device and method

Abstract

The invention discloses a pipe jacking working well reverse construction method construction device and method.The pipe jacking working well reverse construction method construction device comprises a split mounting type formwork platform, the split mounting type formwork platform comprises a supporting rack, the outer side of the supporting rack is connected with a turnover side formwork, the inner side of the supporting rack is connected with a vertically-arranged back plate, and a movable bottom plate is arranged on the surface of the supporting rack; the surface of the movable bottom plate is provided with holes for steel bars to penetrate through. The problem that in the prior art, the quality of reinforced concrete is difficult to control in the construction process of each layer through a working well reverse construction method is solved.

Description

Technical Field

[0001] The invention relates to the technical field of municipal engineering pipe jacking construction, in particular to a reverse construction device and method for a pipe jacking working well. Background Art

[0002] With the acceleration of urbanization and the expansion of urban scale, as well as the frequent occurrence of extreme weather in recent years, the number of stormwater and sewage pipe networks, which perform important urban drainage functions, has increased, and renovation projects are increasingly underway. In particular, with the advancement of the Yangtze River protection program, the existing urban stormwater and sewage pipe networks are not fully separated. With stricter environmental protection policies and higher standards for people's living environment, stormwater and sewage separation and renovation projects are imperative. However, the complexity of the urban underground environment, the diversity of construction techniques, and the limitations of construction space pose a huge challenge to construction management and quality. In the construction process of urban pipe networks, pipe jacking is an important process choice in terms of feasibility and economy, while minimizing or reducing the impact on existing traffic and existing pipelines, especially when buried at a deep depth.

[0003] Pipe jacking construction can be divided into manual or mechanical jacking. Regardless of the jacking method, a working well or receiving well must be set up every 50-300 meters according to the geological conditions. The working well construction process includes the normal caisson construction and the reverse construction method. Due to the complex operation and limited space in urban geological conditions, the reverse construction method is often used. The reverse construction method involves excavation, steel bar tying, formwork, pouring and other processes from the ground down layer by layer. During the construction of each layer, the outer soil is used as the earth formwork, which is prone to collapse if left for a long time. In addition, during the pouring of concrete, soil blocks are mixed in during vibration, affecting the structural strength. In addition, the vertical steel bars are difficult to install, and the threaded threads are easily contaminated, resulting in connection difficulties. In addition, the spacing between the steel bars and the thickness of the protective layer are difficult to control. At the same time, sealing the formwork is difficult, and it is often necessary to set up a supporting work platform, which prolongs the construction period. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a construction device and method for a top-down pipe working shaft, so as to solve the problem of difficulty in controlling the quality of reinforced concrete during the construction process of each layer of the top-down pipe working shaft in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a reverse construction device for a jacking working shaft, including an assembled formwork platform, the assembled formwork platform includes a support frame, the outer side of the support frame is connected to a reversible side formwork, the inner side of the support frame is connected to a vertically arranged back plate, the surface of the support frame is provided with a movable bottom plate, and the surface of the movable bottom plate is provided with holes for passing steel bars.

[0006] Preferably, the support stand comprises longitudinal square steel, the longitudinal square steel is connected to the transverse square steel, and the bottom of the transverse square steel is fixedly connected to the supporting legs.

[0007] Preferably, the longitudinal square steel is fixedly connected to a plurality of mutually parallel transverse square steels.

[0008] Preferably, the transverse square steel is a telescopic structure.

[0009] Preferably, a stopper is further provided on the top of the transverse square steel, and the back plate is supported by the stopper and the upper mold poured concrete.

[0010] Preferably, the side formwork includes a fixing frame, on which a wooden formwork is mounted.

[0011] Preferably, a slot is further provided on the longitudinal beam of the fixing frame, and each two adjacent side molds are connected by the cooperation of a cross bar and the slot.

[0012] Preferably, a support seat is provided on the outside of the fixing frame, and the support seat cooperates with the upper part of the support rod.

[0013] Preferably, the bottom of the fixing frame is connected to the outer side of the supporting frame through a hinge, so as to achieve flip adjustment of the side angle.

[0014] Preferably, water-stop gaskets are installed at the holes of the movable bottom plate to enhance the sealing performance.

[0015] The present invention also discloses a method for constructing a pipe jacking working well in reverse working method, which uses the method for constructing a pipe jacking working well in reverse working method, and comprises the following steps: S1. After the working shaft ring beam is poured, the first layer of earthwork is excavated downwards to the designed elevation. The site outside the shaft wall is leveled and the elevation is strictly controlled to serve as the platform for the assembled formwork. The net height of the support frame and the ring beam at the lower elevation is guaranteed to be the designed height per formwork. S2. Using the steel bars at the corners of the square working pit or at a certain point in the circular working pit as control points, arrange the first assembled formwork platform from the control points. Adjust the retractable transverse square steel bars so that the clearance between the stop block and the reversible side formwork is the designed pit wall thickness. Install the movable floor on the support frame, ensuring that the steel bar spacing and cover thickness meet the design requirements. S3. Install the back plate, which is supported by the block and the inner side of the upper mold poured concrete; S4. Install water-stop gaskets at the openings of the movable floor. First, install vertical reinforcement near the inner openings and connect them to the bottom of the reinforcement in the previous mold, and then tie the transverse reinforcement. Then, install vertical reinforcement near the outer openings and connect them to the bottom of the reinforcement in the previous mold, and then tie the transverse reinforcement. S5. Flip the reversible side form to the designed position and seal it. Use support rods as external supports, with one side fixed to the support seat and the other side fixed to the soil. Follow the same steps to arrange the second side form, installing the crossbars on the slots to form the two side forms into a whole. Arrange support rods at regular intervals on each side form, and lay horizontal steel pipes between the support rods to form the whole. S6. After all the formwork is sealed, pour concrete. After the concrete strength reaches the designed strength, repeat the above steps with the control point as the starting point to construct the next layer of steel bar formwork.

[0016] Furthermore, in S6, the above steps are repeated to construct the next layer of steel formwork. When the working pit ring beam is cast, the first layer of earth is excavated downward to the design elevation, and the movable bottom plate is separated from the vertical steel bars so that it can be reused in the construction of the next layer of steel formwork.

[0017] Beneficial effects of the present invention: 1. The construction device of this invention, through its innovative design of a modular formwork platform, solves existing problems encountered in reverse construction methods, such as difficult rebar positioning, thread contamination, earthwork collapse, and complex formwork sealing. The perforated steel plate structure of the movable base plate ensures precise positioning of the rebar and thread protection. The reversible side forms, with their loose-leaf connections and slot-fixing mechanism, enable rapid formwork support and angle adjustment. The backplate and support frame work together to effectively prevent earthwork collapse. The overall structure forms a systematic formwork sealing system, significantly improving construction quality and efficiency.

[0018] 2. The construction method of the present invention combines the characteristics of the device, and realizes the standardization and refinement of construction by precisely controlling the formwork installation, steel bar connection and concrete pouring process in steps, and utilizing control point positioning and modular assembly technology. It solves the problem of difficulty in controlling the quality of reinforced concrete in each layer construction process of the working well reverse construction method in the prior art.

[0019] 3. During the assembly process of the assembled formwork platform, the side angle is adjusted through the loose-leaf connection structure of the reversible side formwork to facilitate the steel bar binding and formwork support operations.

[0020] 4. The opening design of the movable bottom plate of the present invention realizes the positioning of the vertical reinforcement, and because the bottom of the steel bar passes through a part of the opening of the movable bottom plate downward, when pouring concrete on the upper side of the movable bottom plate, it can effectively prevent the concrete from contaminating the bottom of the steel bar and its threaded thread from being contaminated, thereby ensuring the connection quality between the next layer of vertical steel bars and the bottom of the previous layer of steel bars.

[0021] 5. The backboard of the present invention effectively prevents earthwork collapse during the pouring process and avoids soil lumps from mixing into the concrete and affecting the structural strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the front structure of a reverse construction method construction device for a pipe jacking working shaft; Figure 2 This is a left-side structural schematic diagram of a reverse construction method construction device for a pipe jacking working shaft; Figure 3 This is a schematic diagram of the top view of a reverse construction method device for a pipe jacking working shaft; Figure 4 The figure is a schematic diagram of the structure of a reverse construction device for a pipe jacking working shaft during application. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1: Figure 1-4 As shown, this embodiment discloses a reverse construction device for a jacking working shaft, including an assembled formwork platform, the assembled formwork platform includes a support frame 1, the outer side of the support frame 1 is connected to a reversible side form 2, the inner side of the support frame 1 is connected to a vertically arranged back plate 3, the surface of the support frame 1 is provided with a movable bottom plate 4, and the surface of the movable bottom plate 4 is provided with holes for passing steel bars.

[0025] Preferably, the support stand 1 includes a longitudinal square steel 5 , the longitudinal square steel 5 is connected to a transverse square steel 6 , and the bottom of the transverse square steel 6 is fixedly connected to the support legs 7 .

[0026] Preferably, the longitudinal square steel 5 is fixedly connected to a plurality of mutually parallel transverse square steels 6 .

[0027] Preferably, the transverse square steel 6 is a retractable structure.

[0028] Preferably, a stopper 13 is further provided on the top of the transverse square steel 6, and the back plate 3 is supported by the stopper 13 and the upper mold poured concrete.

[0029] Preferably, the side formwork 2 includes a fixing frame 8, on which a wooden formwork 8.1 is mounted. In this embodiment, the height of the side formwork 2 is slightly greater than the height of each mold casting in the reverse casting method. Preferably, a slot is further provided on the longitudinal beam of the fixing frame 8, and each two adjacent side molds 2 are connected by the cooperation of the cross bar 9 and the slot.

[0030] Preferably, a support seat 10 is provided on the outside of the fixing frame 8 , and the support seat 10 cooperates with the upper part of the support rod 14 .

[0031] Preferably, the bottom of the fixing frame 8 is connected to the outer side of the supporting frame 1 through a hinge 12 to achieve flip adjustment of the side angle.

[0032] Preferably, water-stop gaskets 11 are installed in the holes of the movable floor 4 to enhance sealing performance. In this embodiment, the movable floor 4 is made of steel plate with holes. The hole diameter is larger than the diameter of the vertical reinforcement in the working shaft wall, and the hole spacing is the same as the vertical reinforcement spacing. The installation of water-stop gaskets 11 further prevents concrete from flowing out of the gaps between the holes and the reinforcement, preventing leakage and contamination of the bottom of the reinforcement.

[0033] Example 2: Figure 4 As shown, this embodiment discloses a method for constructing a pipe jacking working well by reverse construction, and uses the device for constructing a pipe jacking working well by reverse construction, including the following steps: S1. After the working shaft ring beam is poured, the first layer of earthwork is excavated downwards to the designed elevation. The site outside the shaft wall is leveled and the elevation is strictly controlled to serve as the platform for the assembled formwork. The net height of the support frame 1 and the ring beam at the lower elevation is guaranteed to be the designed height per formwork. S2. Using the steel bars at the corners of the square working well or at a certain point of the circular working well as control points, arrange the first assembled formwork platform from the control points; adjust the retractable transverse square steel 6 so that the clearance area between the stopper 13 and the reversible side form 2 is the designed well wall thickness; install the movable bottom plate 4 on the support stand 1, and ensure that the steel bar spacing and protective layer thickness meet the design requirements; S3, installing the back plate 3, which is supported by the block 13 and the inner side of the upper mold poured concrete; S4. Install the water-stop gasket 11 at the opening of the movable bottom plate 4. First, install the vertical steel bars near the inner opening and connect them to the bottom of the steel bars of the previous mold for pouring concrete, and then tie the horizontal steel bars; then install the vertical steel bars near the outer opening and connect them to the bottom of the steel bars of the previous mold for pouring concrete, and then tie the horizontal steel bars; S5. Flip the reversible side form 2 to the designed position and seal the form. Use support rods 14 as external supports, with one side fixed to the support base 10 and the other side fixed to the soil. Follow the same steps to arrange the second side form 2. Install the crossbars 9 on the slots to form the two side forms 2 into a whole. Arrange support rods 14 at regular intervals on each side form 2. Horizontal steel pipes are laid between the support rods 14 to form the whole. S6. After all the formwork is sealed, pour concrete. After the concrete strength reaches the designed strength, repeat the above steps with the control point as the starting point to construct the next layer of steel bar formwork.

[0034] Furthermore, in S6, the above steps are repeated to carry out the construction of the next layer of steel formwork. When the working well ring beam is cast, the first layer of earthwork is excavated downward to the design elevation, and the movable bottom plate 4 is separated from the vertical steel bars so that it can be reused in the construction of the next layer of steel formwork.

[0035] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A top-down construction device for a pipe jacking pit, comprising an assembled formwork platform, characterized in that: The assembled formwork platform comprises a support frame (1), the outer side of the support frame (1) is connected to a reversible side form (2), the inner side of the support frame (1) is connected to a vertically arranged back plate (3), and a movable bottom plate (4) is provided on the surface of the support frame (1), and holes for passing steel bars are opened on the surface of the movable bottom plate (4).

2. A pipe jacking work pit reverse construction device according to claim 1, characterized in that: The support stand (1) comprises longitudinal square steel (5), the longitudinal square steel (5) is connected to transverse square steel (6), and the bottom of the transverse square steel (6) is fixedly connected to the support leg (7).

3. A top-down construction device for a pipe jacking work pit according to claim 2, characterized in that: The longitudinal square steel (5) is fixedly connected to a plurality of mutually parallel transverse square steels (6).

4. A top-down construction device for a pipe jacking pit according to claim 3, characterized in that: The transverse square steel (6) is a telescopic structure.

5. A top-down construction device for a pipe jacking work pit according to claim 4, characterized in that: A stopper (13) is also provided on the top of the transverse square steel (6), and the back plate (3) is supported by the stopper (13) and the upper mold poured concrete.

6. A top-down construction device for a pipe jacking work pit according to claim 1, characterized in that: The side formwork (2) comprises a fixing frame (8), and a wooden formwork (8.1) is mounted on the fixing frame (8).

7. A top-down construction device for a pipe jacking work pit according to claim 6, characterized in that: A slot is also provided on the longitudinal beam of the fixing frame (8), and each two adjacent side molds (2) are connected through the cooperation of a cross bar (9) and the slot.

8. The reverse construction method device for a pipe jacking working well according to claim 6, characterized in that: A support seat (10) is provided on the outside of the fixing frame (8), and the support seat (10) cooperates with the upper part of the support rod (14).

9. A top-down construction device for a pipe jacking work pit according to claim 6, characterized in that: The bottom of the fixing frame (8) is connected to the outer side of the supporting frame (1) via a hinge (12) for realizing flip adjustment of the side angle.

10. The reverse construction method device for a pipe jacking working well according to claim 1, characterized in that: Water-stopping gaskets (11) are installed at the holes of the movable bottom plate (4) to enhance the sealing performance.

11. A method for constructing a pipe jacking work pit in reverse working method, using the pipe jacking work pit in reverse working method construction device according to any one of claims 1 to 10, characterized in that: The following steps are involved: S1. After the work pit ring beam is cast, the first layer of earthwork is excavated downwards to the design elevation, the site outside the pit wall is leveled and the elevation is strictly controlled, and it is used as the platform for the assembled formwork, ensuring that the net height of the support frame (1) and the ring beam at the lower elevation is the design height of each formwork; S2. Using the steel bars at the corners of the square working pit or the steel bars at a certain point of the circular working pit as control points, arrange the first assembled formwork platform from the control points; Adjust the retractable transverse square steel (6) so that the clearance area between the stopper (13) and the reversible side form (2) is the designed well wall thickness, and install the movable bottom plate (4) on the support stand (1) to ensure that the spacing between the steel bars and the thickness of the protective layer meet the design requirements; S3, installing the back plate (3), wherein the back plate (3) is supported by the stopper (13) and the inner side of the upper mold cast concrete; S4. Install a water-stop gasket (11) at the opening of the movable bottom plate (4). First, install vertical steel bars at the opening near the inner side and connect them to the bottom of the steel bars of the upper mold for pouring concrete, and then tie the transverse steel bars; then install vertical steel bars at the opening near the outer side and connect them to the bottom of the steel bars of the upper mold for pouring concrete, and then tie the transverse steel bars; S5. Flip the reversible side form (2) to the designed position and seal the formwork. Use support rods (14) as external supports, one side of which is fixed to the support seat (10) and the other side is fixed to the soil. Arrange the second side form (2) in the same manner, install the crossbar (9) on the slot to form the two side forms (2) as a whole, arrange support rods (14) at a certain interval on each side form (2), and set horizontal steel pipes between the support rods (14) to form the whole. S6. After all the formwork is sealed, pour concrete. After the concrete strength reaches the designed strength, repeat the above steps with the control point as the starting point to construct the next layer of steel bar formwork.

12. A top-down construction method for a pipe jacking work pit according to claim 11, characterized in that: In S6, the above steps are repeated to carry out the construction of the next layer of steel formwork. When the working well ring beam is cast, the first layer of earthwork is excavated downward to the design elevation, and the movable bottom plate (4) is separated from the vertical steel bars so that it can be reused in the construction of the next layer of steel formwork.

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