Inverted shaft excavation construction method based on template support system vertical suspension type mobile support

Abstract

The application discloses a kind of based on template support system vertical suspension type mobile support's inverted well excavation construction method, it is characterized in comprising the following steps: S1, prefabricated template support system;S2, construction first section well body and first section well wall;S3, template in situ support under earthwork excavation: after the concrete of first section well wall reaches initial setting, directly carry out the excavation of second section well body and second section well wall, without removing template support system;S4, steel bar binding and mobile support synchronous construction;S5, concrete pouring: carry out the concrete pouring construction of second section well wall;S6, cycle repeats step S3, step S4 and step S5, until to reach inverted well bottom design position place.The application solves the inverted well excavation and support construction process, due to template and support system repeatedly removed, multiple up and down hoisting, so that excavation and support cannot form synchronous flow operation, cannot guarantee construction period and construction safety problem.

Description

Technical Field

[0001] The invention belongs to the technical field of inverted well support and excavation construction, and specifically discloses an inverted well support template system and a synchronous excavation construction method. Background Art

[0002] Commonly used methods for municipal pipeline construction include pipe jacking and open-cut methods. The pipe jacking method mainly involves constructing a pipe jacking working shaft, which mainly includes caissons, support excavations, and inverted wells. Caisson construction causes great disturbance to the surrounding environment, while support excavations require the construction of temporary internal supports and support systems, with many processes and high costs. Therefore, inverted wells have been promoted and applied more widely due to their simple process, low site requirements, and small impact on the surrounding area. In order to ensure the stability of the inverted well wall, a full-floor support bracket is usually used as the formwork support system. Each time a section of the well wall concrete is poured, the scaffolding needs to be erected and dismantled. Only after the scaffolding is dismantled can the next section of earthwork be excavated. The construction period is long, and the safety risks of vertically lifting the formwork and scaffolding up and down each time are relatively high. The construction cost is high, and the quality of concrete construction is difficult to guarantee, and the construction progress is also very slow. Summary of the Invention

[0003] In response to the above problems, the purpose of the present invention is to provide an inverted well support formwork system and a synchronous excavation construction method, which solves the problem that during the excavation and support construction of the inverted well, the formwork and support system are repeatedly dismantled and lifted up and down many times, making it impossible for excavation and support to form a synchronous flow operation and unable to guarantee the construction period and construction safety.

[0004] To achieve the above objectives, the present invention provides the following technical solutions.

[0005] The inverted well excavation construction method based on the vertical movable support of the formwork support system is characterized by comprising the following steps:

[0006] S1. Prefabricated formwork support system

[0007] The formwork support system is prefabricated in the factory according to the size and design parameters of the inverted well;

[0008] S2. Construction of the first section of the well body and the first section of the well wall

[0009] First, excavate the first section of the well body and the first section of the well wall. Then, carry out steel bar binding construction within the first section of the well wall, and reserve support screws and hooks on the outer side and top edge of the steel mesh respectively. Then, use the support screws reserved in the first section of the well wall to fix the formwork support system to the designed position for pouring the first section of the well wall. The hook reserved in the first section of the well wall is fixed to the top of the formwork support system through a hand hoist. Finally, carry out concrete pouring construction of the first section of the well wall.

[0010] S3. Excavation under in-situ formwork support

[0011] After the concrete of the first section of the shaft wall reaches initial setting, the second section of the shaft body and the second section of the shaft wall are directly excavated without removing the formwork support system, so that the formwork support system is fixed in situ on the first section of the shaft wall to protect the formed concrete;

[0012] S4. Synchronous construction of steel bar binding and mobile support

[0013] Rebar binding is carried out within the second section of the shaft wall, and support screws and hooks are reserved on the outer side and top edge of the steel mesh respectively. While the reinforcement is being bound, the formwork support system is detached from the support screws reserved for the first section of the shaft wall. After complete detachment, the formwork support system is lowered to the bottom of the second section of the shaft body using a hand winch. The formwork support system is then fixed to the designed position for pouring the second section of the shaft wall using the support screws reserved for the second section of the shaft wall. The hooks reserved for the second section of the shaft wall are then fixed to the top of the formwork support system using a hand winch.

[0014] S5. Concrete pouring

[0015] Carry out concrete pouring construction of the second section of the shaft wall;

[0016] S6. Repeat steps S3, S4 and S5 in a loop until the designed bottom position of the inverted well is reached.

[0017] Preferably, the earth excavation is carried out in layers using a telescopic arm excavator.

[0018] Preferably, in step S4, the steel wire rope is pulled by an on-site excavator to connect with the formwork support system, so that the formwork support system can be moved laterally to cooperate with the hand hoist to lower the formwork support system.

[0019] Preferably, the formwork support system is assembled from a number of formwork support components.

[0020] Preferably, the template support assembly includes a support frame with a triangular cross-section and a shaping template fixedly arranged on one side of the support frame.

[0021] Preferably, when each section of the well wall is undergoing reinforcement binding construction, 2 to 4 hooks are reserved at the installation position of each formwork support assembly so that each formwork support assembly can be connected one by one to the hooks through a hand winch corresponding to the number of hooks.

[0022] Preferably, the formwork support system is provided with screw through holes and connecting ears which respectively cooperate with the support screws and the hooks.

[0023] Preferably, the formwork in the formwork support system is polished and cleaned every time 2-3 sections of the well wall are completed to ensure the appearance quality of the concrete.

[0024] Preferably, the formwork in the formwork support system is polished and cleaned when the formwork support system is lowered to the bottom of the next section of the well body during the synchronous construction of the reinforcement binding and the moving support of the next section of the well wall.

[0025] Preferably, in steps S2 and S5, a release agent is uniformly applied to the surface of the formwork in the formwork support system before the concrete pouring construction.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] In the present application, the reinforcement net of the inverted well wall is provided with a support screw and a hook, the formwork support system is fixed at the designed position of the inverted well wall by penetrating the support screw, and the top of the formwork support system is connected with the hook by a chain hoist. This not only ensures that the formwork support system is close to the inverted well wall to realize the concrete pouring construction of the inverted well wall, but also enables the formwork system to be fixed in situ on the well wall after the concrete pouring of one section of the inverted well wall is completed, so that the next section of the inverted well wall can be excavated. This not only saves the construction period, but also protects the formed concrete. After the excavation and reinforcement construction of the next section of the inverted well wall are completed, the connection end of the formwork support system of the previous section can be removed, so that the formwork support system can be vertically hung and moved by the chain hoist after being separated from the support screw, and then be installed and used on the next section of the well wall. This not only saves the repeated erection and hoisting construction of the traditional support system, improves the construction efficiency and safety, but also ensures the synchronous flow operation of the inverted well support and excavation, and reduces the construction cost.

[0028] The present application is ingenious, convenient, efficient, and solves the problems of great safety risk, unsynchronized flow operation of excavation and support, and inability to ensure the construction period in the process of inverted well excavation and support construction due to repeated removal and hoisting of the formwork and support system. The present application has strong universality, good social benefits, and good application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the inverted well excavation construction of the present application;

[0030] Figure 2 is a schematic diagram of the construction of the first section of the well body and the first section of the well wall in the present application;

[0031] Figure 3 is a schematic diagram of the soil excavation under the in-situ support of the formwork in the present application;

[0032] Figure 4 This is a schematic diagram of the simultaneous construction of steel bar binding and mobile support in the present invention;

[0033] Figure 5 Schematic diagram of the three-dimensional structure of the formwork support system;

[0034] Figure 6 Schematic diagram of the three-dimensional structure of the formwork support assembly;

[0035] Figure 7 Schematic diagram of the three-dimensional structure of the shaping template;

[0036] Figure 8 Schematic diagram of the three-dimensional structure of the support frame;

[0037] The meanings of the marks in the above figure are: inverted well wall 1, formwork support system 2, formwork support assembly 3, shaped formwork 31, panel 311, screw through-hole 3111, vertical stiffening rib 312, transverse stiffening rib 313, connecting ear 314, screw hole 315, support frame 32, vertical inner support column 321, vertical outer support column 322, connecting support beam 323, transverse reinforcement beam 324, scissors support 325, top support socket 326, support screw 4, hook 5, hand hoist 6, excavator 7, steel mesh 8, support top support 9. DETAILED DESCRIPTION

[0038] The present invention will be further described below in the form of specific embodiments in conjunction with the accompanying drawings. It should be noted that the following embodiments are merely illustrative of the present invention in the form of examples, but the scope of protection of the present invention is not limited thereto. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example 1

[0040] The inverted well excavation construction method based on the vertical movable support of the formwork support system includes the following steps:

[0041] S1. Prefabricated formwork support system

[0042] Prefabricate the formwork support system 2 in the factory according to the size and design parameters of the inverted well; see Figure 5 The formwork support system 2 is assembled from a number of formwork support components 3, so that each formwork support component 3 can be moved vertically and then assembled into a whole; please refer to Figure 6 The template support assembly 3 includes a support frame 32 with a triangular cross section and a shaping template 31 fixedly arranged on one side of the support frame 32;

[0043] In this embodiment, the fixed formwork 31 and the support frame 32 are both fixed steel structure components. The support frame 32 is the main load-bearing component, which is used to bear the load during the concrete construction process of each section of the inverted well wall; Figure 7 The forming template 31 includes a panel 311, vertical stiffening ribs 312 and transverse stiffening ribs 313 arranged in a grid pattern on the back of the panel 311, and a connecting ear 314 provided on the top of the panel 311 for connecting to the hand chain hoist; wherein the panel 311 is made of a formed steel plate according to the height and length of each section of the inverted well wall 1, and the vertical stiffening ribs 312 and transverse stiffening ribs 313 are formed steel plates and welded to the back of the panel 311 to form a grid reinforcement; the panel 311 is provided with screw through holes 3111 that cooperate with the support screws; please refer to Figure 8 The support frame 32 includes a vertical inner support column 321, a vertical outer support column 322, a transverse reinforcement beam 324 connected between the vertical inner support columns 321 or between the vertical outer support columns 322, a connecting support beam 323, and a scissors support 325 arranged between adjacent vertical outer support columns 322; the top of the vertical outer support column 322 is connected and fixed to the vertical inner support column 321 through the transverse reinforcement beam 324, and the connecting support beam 323 is connected between the transverse reinforcement beam 324 arranged at the bottom of the vertical inner support column 321 and the vertical outer support column 322, so that the support frame 32 forms a support system with a triangular cross section; wherein the vertical stiffening ribs 312 and the vertical inner support column The support column 321 is provided with screw holes 315 that cooperate with each other, so that the panel and the support frame can be firmly connected by the cooperation of bolts and screw holes 315; the transverse reinforcement beam 324 has two arranged at the bottom of the vertical outer support column 322 and reserved for the support screws at the corresponding positions to pass through the gap; when each formwork support assembly 3 is fixed to the designed position of the well wall, the reserved support screw can be passed through the screw through-hole 3111 and the gap between the two transverse reinforcement beams 324 at the bottom of the vertical outer support column 322, and then locked and fixed with a butterfly nut; the transverse reinforcement beam 324 is provided with a jacking socket 326, which is used to install the support jacking socket 326 to tighten the panel 311;

[0044] S2. Construction of the first section of the well body and the first section of the well wall

[0045] See also Figure 2, use the telescopic arm excavator 7 to excavate the earthwork of the first section of the well body and the first section of the well wall in layers, then carry out steel bar binding construction within the range of the first section of the well wall, and reserve support screws 4 and hooks 5 on the outer side and top edge of the steel mesh 8 respectively; 2 to 4 hooks are reserved at the installation position of each formwork support component, so that each formwork support component 3 can be connected to the hook 5 one by one through the hand hoist 6 corresponding to the number of hooks 5, so as to ensure the stability of each formwork support component during the lowering process; then the formwork support system is fixed to the designed position for pouring the first section of the well wall through the support screws reserved in the first section of the well wall, and the hooks reserved in the first section of the well wall are fixedly connected to the top of the formwork support system through the hand hoist, finally, the formwork surface of the formwork support system is evenly coated with a release agent, and then the concrete pouring construction of the first section of the well wall is carried out;

[0046] S3. Excavation under in-situ formwork support

[0047] See also Figure 3 After the concrete of the first section of the shaft wall reaches initial setting, the telescopic arm excavator 7 is directly used to excavate the second section of the shaft body and the second section of the shaft wall in layers, and the formwork support system is not removed at this time; during the excavation of the second section of the shaft body and the second section of the shaft wall, the formwork support system is still suspended and fixed above the second section of the shaft body and the second section of the shaft wall by the support screws and the reserved hooks of the first section of the shaft wall in cooperation with the hand winch, and is then fixed close to the shaft wall. Therefore, not removing the formwork support system will not affect the excavation of the shaft. On the contrary, since the removal step of the formwork support system is omitted, not only can the construction period be shortened, but the formwork support system fixed in situ on the shaft wall of the inverted shaft can also protect the formed concrete;

[0048] S4. Synchronous construction of steel bar binding and mobile support

[0049] See also Figure 4After the excavation is completed, the steel bar binding construction is carried out in the second section of the well wall, and support screws and hooks are reserved on the outside and top edge of the steel mesh respectively; 2 to 4 hooks are reserved at the installation position of each formwork support component, so that each formwork support component can be connected to the hook one by one through a hand winch corresponding to the number of hooks, thereby ensuring the stability of each formwork support component during the lowering process; while the steel bar binding construction is being carried out, the formwork support system is detached from the support screws reserved for the first section of the well wall, and after complete detachment, the formwork support system is lowered to the bottom of the second section of the well body using a hand winch; when lowering the formwork support system, the wire rope can be pulled by the on-site excavator to connect to the formwork support system, so that the formwork support system can be moved horizontally to cooperate with the hand winch to lower the formwork support system; then the formwork support system is fixed to the designed position for pouring the second section of the well wall through the support screws reserved for the second section of the well wall, and the hooks reserved for the second section of the well wall are fixedly connected to the top of the formwork support system through the hand winch;

[0050] In this step, support screws and hooks are reserved on the steel mesh of the inverted well wall, and the support screws are used to penetrate the formwork support system to fix the formwork support system at the designed position for pouring the inverted well wall, and the top of the formwork support system is connected to the hook through a hand hoist. This not only ensures that the formwork support system is vertically suspended close to the inverted well wall to realize the pouring of concrete on the inverted well wall, but also after the concrete pouring of one section of the inverted well wall is completed, the formwork system can be fixed in situ on the well wall while the excavation of the next section of the inverted well wall is carried out. After the reinforcement construction is completed, the butterfly nut connecting the previous section's formwork support system and the support screw can be removed, so that the formwork support system can be suspended and moved by a hand winch after being freed from the fixation of the support screw, and then moved to the next section of the shaft wall for installation and use. This not only saves the repeated erection and lifting construction of the traditional support system, thereby improving construction efficiency and safety, but also ensures that the inverted shaft support and excavation are synchronized and flow-through operations are achieved, reducing construction costs. In addition, the vertical mobile support of the formwork support system can be carried out simultaneously with the reinforcement binding, further shortening the construction period.

[0051] S5. Concrete pouring

[0052] First, evenly apply the release agent on the formwork surface of the formwork support system, and then proceed with the concrete pouring construction of the second section of the shaft wall;

[0053] S6, cyclically repeating steps S3, S4, and S5, using the formwork support system to perform vertical mobile support to complete the earthwork excavation of the subsequent section well body, as well as the earthwork excavation, steel bar binding, mobile support, and concrete pouring of the subsequent section well wall, until reaching the designed position of the inverted well bottom;

[0054] During the construction process, after the construction of 2-3 sections of the well wall, the reinforcement binding and the synchronous construction of the next section of the well wall are carried out, when the template support system is vertically hung and lowered to the bottom of the next section of the well body, the template in the template support system is polished and cleaned to ensure the surface quality of the concrete.

[0055] It is apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, nor the application suggested. Moreover, the application can be implemented in other concrete forms without departing from the spirit or essential characteristics thereof. Therefore, the embodiments should be considered exemplary and non-limiting, the scope of the application being defined by the appended claims rather than the foregoing description, and all changes falling within the meaning and range of equivalency of the essential elements of the claims are intended to be embraced therein.

[0056] Furthermore, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. The inverted well excavation construction method based on the vertical movable support of the formwork support system is characterized by: The steps include: S1. Prefabricated formwork support system The formwork support system is prefabricated in the factory according to the size and design parameters of the inverted well; S2. Construction of the first section of the well body and the first section of the well wall First, excavate the first section of the well body and the first section of the well wall. Then, carry out steel bar binding construction within the first section of the well wall, and reserve support screws and hooks on the outer side and top edge of the steel mesh respectively. Then, use the support screws reserved in the first section of the well wall to fix the formwork support system to the designed position for pouring the first section of the well wall. The hook reserved in the first section of the well wall is fixed to the top of the formwork support system through a hand hoist. Finally, carry out concrete pouring construction of the first section of the well wall. S3. Excavation under in-situ formwork support After the concrete of the first section of the shaft wall reaches initial setting, the second section of the shaft body and the second section of the shaft wall are directly excavated without removing the formwork support system, so that the formwork support system is fixed in situ on the first section of the shaft wall to protect the formed concrete; S4. Synchronous construction of steel bar binding and mobile support Rebar binding is carried out within the second section of the shaft wall, and support screws and hooks are reserved on the outer side and top edge of the steel mesh respectively. While the reinforcement is being bound, the formwork support system is detached from the support screws reserved for the first section of the shaft wall. After complete detachment, the formwork support system is lowered to the bottom of the second section of the shaft body using a hand winch. The formwork support system is then fixed to the designed position for pouring the second section of the shaft wall using the support screws reserved for the second section of the shaft wall. The hooks reserved for the second section of the shaft wall are then fixed to the top of the formwork support system using a hand winch. S5. Concrete pouring Carry out concrete pouring construction of the second section of the shaft wall; S6. Repeat steps S3, S4 and S5 in a loop until the designed bottom position of the inverted well is reached.

2. The inverted well excavation construction method based on the vertical movable support of the formwork support system according to claim 1 is characterized in that: The earth excavation is carried out in layers using a telescopic arm excavator.

3. The inverted well excavation construction method based on the vertical movable support of the formwork support system according to claim 2 is characterized in that: In step S4, the excavator on site pulls the wire rope to connect with the formwork support system, so that the formwork support system can be moved horizontally to cooperate with the hand hoist to lower the formwork support system.

4. The inverted well excavation construction method based on vertical movable support of formwork support system according to claim 1 is characterized in that: The formwork support system is assembled from a number of formwork support components.

5. The inverted well excavation construction method based on vertical movable support of formwork support system according to claim 4 is characterized in that: The template support assembly includes a support frame with a triangular cross section and a shaping template fixedly arranged on one side of the support frame.

6. The inverted well excavation construction method based on vertical movable support of formwork support system according to claim 4 is characterized in that: When the steel bars of each section of the shaft wall are being tied, 2 to 4 hooks are reserved at the installation position of each formwork support assembly so that each formwork support assembly can be connected to the hooks one by one through a hand hoist corresponding to the number of hooks.

7. The inverted well excavation construction method based on vertical movable support of formwork support system according to claim 1 is characterized in that: The formwork support system is provided with screw rod through holes and connection ears which respectively cooperate with the support screw rods and the hooks.

8. The inverted well excavation construction method based on vertical movable support of formwork support system according to claim 1 is characterized in that: After every 2 to 3 sections of the well wall are constructed, the formwork in the formwork support system is polished and cleaned to ensure the surface quality of the concrete.

9. The inverted well excavation construction method based on vertical movable support of formwork support system according to claim 8, characterized in that: After completing the construction of 2 to 3 sections of the shaft wall, during the simultaneous construction of the reinforcement binding and mobile support of the next section of the shaft wall, when the formwork support system is lowered vertically to the bottom of the next section of the shaft body, the formwork in the formwork support system is polished and cleaned.

10. The inverted well excavation construction method based on vertical movable support of formwork support system according to claim 1, characterized in that: In the steps S2 and S5, before the concrete pouring construction, a release agent is evenly applied to the surface of the formwork of the formwork support system.

Images