Upside-down well excavation construction method based on template supporting system hanging type movable support

Abstract

The invention discloses an upside-down well excavation construction method based on hanging type movable supporting of a formwork supporting system. The upside-down well excavation construction method is characterized by comprising the following steps that S1, the formwork supporting system is prefabricated; s2, a first section of well body and a first section of well wall are constructed; s3, earth excavation under template in-situ support is conducted, specifically, after concrete of the first section of well wall reaches initial set, excavation of the second section of well body and the second section of well wall is directly conducted, and a template supporting system is not dismantled; s4, synchronous construction of steel bar binding and movable supporting is conducted; s5, concrete pouring is conducted, specifically, concrete pouring construction of the second section of well wall is conducted; and S6, the step S3, the step S4 and the step S5 are cyclically repeated until the designed position of the bottom of the upside-down well is reached. The problems that in the excavation and support construction process of the upside-down hanging well, due to the fact that a formwork and a supporting system are repeatedly dismantled and lifted up and down for multiple times, excavation and support cannot form synchronous line production, and the construction period and construction safety cannot be guaranteed are solved.

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] With the continuous development of social urbanization, my country's infrastructure has become more and more perfect. In recent years, a large number of water supply, drainage, sewage diversion and other engineering construction have been carried out to further improve urban functions, enhance urban quality and improve the living environment. With the urban renewal action, the construction of urban underground pipelines and integrated pipeline corridors, the "factory-network integration" rainwater and sewage diversion transformation and other work are comprehensively promoted. The methods commonly used in municipal pipeline construction include jacking method and open excavation method. The jacking method mainly constructs jacking working wells, and the jacking working wells mainly include caissons, support excavation and inverted wells. Among them, the caisson construction has a great disturbance to the surrounding environment, and the support excavation requires the construction of temporary internal support and support system, with many processes and high cost. Therefore, the inverted well has been promoted and applied more due to its simple process, low site requirements and small impact on the surrounding areas. In order to ensure the stability of the inverted well wall, a full-height bracing 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 earth excavation be carried out. The construction period is long, and each time the formwork and scaffolding are lifted vertically up and down, there are great safety risks. The construction cost is high, the quality of concrete construction is difficult to guarantee, and the construction progress is very slow. Summary of the invention

[0003] In view of 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 inverted well excavation and support construction process, 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 object, 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 range of the first section of the well wall, and reserve support screws and hooks on the outside and top edge of the steel mesh respectively; then, fix the formwork support system at the designed position for pouring the first section of the well wall through the support screws reserved for the first section of the well wall, and fix the hooks reserved for the first section of the well wall to the top of the formwork support system through a hand winch, and 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 construction is carried out in the range of the second section of the well wall, and support screws and hooks are reserved on the outer side and top edge of the steel mesh respectively; while the reinforcement binding construction is in progress, the formwork support system is detached from the support screws reserved in 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 by a hand winch, and the formwork support system is fixed to the designed position for pouring the second section of the well wall by the support screws reserved in the second section of the well wall, and then the hook reserved in the second section of the well wall is fixedly connected to the top of the formwork support system by a hand winch;

[0014] S5. Concrete pouring

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

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

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

[0018] Preferably, 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 winch to vertically lower the formwork support system.

[0019] Preferably, the formwork support system is assembled from a plurality 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 shaft 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 with a hook via 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, after every 2 to 3 sections of the shaft wall are constructed, the formwork in the formwork support system is polished and cleaned to ensure the apparent quality of the concrete.

[0024] Preferably, after completing the construction of 2 to 3 sections of the shaft wall, during the simultaneous construction of 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.

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

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

[0027] The present invention reserves support screws and hooks on the steel mesh of the inverted well wall, and uses the support screws to penetrate the formwork support system to fix the formwork support system at the designed position for pouring the inverted well wall, and connects the top of the formwork support system with the hook through a hand chain hoist, which can not only ensure that the formwork support system is close to the inverted well wall to realize the concrete pouring construction of the inverted well wall; and after the concrete pouring of one section of the inverted well wall is completed, the formwork system can be fixed on the well wall in situ while the excavation of the next section of the inverted well wall is carried out, which not only saves construction time, but also Moreover, the formwork support system originally fixed on the wall of the inverted well can also protect the formed concrete. After the excavation of the next section of the inverted well wall and the reinforcement construction are completed, the connection end of the previous section of the formwork support system can be removed, so that the formwork support system can be suspended vertically by a hand winch after being detached from the fixation of the support screw, so as to be moved to the next section of the well wall for installation and use. This not only saves the repeated erection and lifting construction of the traditional support system to improve construction efficiency and safety, but also ensures the synchronous flow operation of inverted well support and excavation, thereby reducing construction costs.

[0028] The invention is ingenious, convenient and efficient. It solves the problems of repeated dismantling of formwork and support system and multiple up and down lifting during the excavation and support construction of inverted wells, which poses great safety risks, and the inability to form synchronous flow operations for excavation and support and ensure the construction period. The invention has strong versatility, good social benefits and good prospects for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the excavation construction of an inverted well according to the present invention;

[0030] Figure 2 It 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 invention;

[0031] Figure 3 It is a schematic diagram of earth excavation under the in-situ support of the template in the present invention;

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

[0033] Figure 5 It is a three-dimensional structural schematic diagram of the formwork support system;

[0034] Figure 6 It is a three-dimensional structural schematic diagram of the formwork support assembly;

[0035] Figure 7 It is a schematic diagram of the three-dimensional structure of the shaping template;

[0036] Figure 8 is a 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 winch 6, excavator 7, steel mesh 8, support top support 9. DETAILED DESCRIPTION

[0038] The present invention is further described in the form of specific embodiments in conjunction with the accompanying drawings. It should be pointed out that the following implementation modes are only illustrative descriptions of the present invention in the form of examples, but the protection scope of the present invention is not limited thereto. The described embodiments 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 creative work 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] The formwork support system is prefabricated 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 plurality 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, and 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; please refer to Figure 7 The forming template 31 includes a panel 311, vertical stiffening ribs 312 and transverse stiffening ribs 313 arranged in a grid shape on the back of the panel 311, and a connecting ear 314 provided on the top of the panel 311 for connecting with 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 a screw through hole 3111 that cooperates with the support screw; 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 323 are connected to the vertical inner support column 321 and the vertical outer support column 322. 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 the bolts and the screw holes 315; the transverse reinforcement beam 324 has two arranged at the bottom of the vertical outer support column 322 and a gap is reserved for the support screw rods at the corresponding position to pass through; when each template support assembly 3 is fixed at the designed position of the well wall, the reserved support screw rod can be passed through the screw rod 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 top support socket 326, and the top support socket 326 is used to install the support top support 9 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 a telescopic arm excavator 7 to excavate 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; reserve 2 to 4 hooks at the installation position of each formwork support component, so that each formwork support component 3 can be connected to the hooks 5 one by one through a hand chain 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 fix the formwork support system to the designed position for pouring the first section of the well wall through the support screws reserved for the first section of the well wall, and fix the hooks reserved for the first section of the well wall to the top of the formwork support system through the hand chain hoist, finally, evenly apply a release agent on the formwork surface of the formwork support system, and then carry out the concrete pouring construction of the first section of the well wall;

[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, since the formwork support system is still coordinated with the support screws and the reserved hooks of the first section of the shaft wall and the hand winch, and then hung and fixed on the second section of the shaft body and the second section of the shaft wall close to the shaft wall, not removing the formwork support system will not affect the excavation of the earthwork. 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 outer side 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, so as to ensure 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 in 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 by a hand winch; when lowering the formwork support system, the steel wire rope can be pulled by the excavator on site to connect with 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 at the designed position for pouring the second section of the well wall through the support screws reserved in the second section of the well wall, and the hook reserved in the second section of the well wall is 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 winch. This not only ensures that the formwork support system is 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. When the excavation of the next section of the inverted well wall is completed, After the reinforcement construction is completed, the butterfly nut connecting the formwork support system of the previous section and the support screw can be removed, so that the formwork support system can be suspended and moved by a hand winch after being separated from the fixation of the support screw, and then moved to the next section of the well wall for installation and use. This can not only save the repeated erection and lifting construction of the traditional support system to improve construction efficiency and safety, but also ensure the synchronous flow operation of the inverted well support and excavation, thereby reducing construction costs. In addition, the vertical suspension 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 template surface of the template support system, and then pour the concrete of the second section of the shaft wall;

[0053] S6, repeating steps S3, S4 and S5 in a loop, using the formwork support system to perform vertical mobile support, so as 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 at the bottom of the inverted well;

[0054] During the above construction process, 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 to ensure the apparent quality of the concrete.

[0055] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, nor to what is suggested by the present invention. Moreover, the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0056] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An inverted well excavation construction method based on a vertical movable support of a formwork support system, characterized in that: 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 range of the first section of the well wall, and reserve support screws and hooks on the outside and top edge of the steel mesh respectively; then, fix the formwork support system at the designed position for pouring the first section of the well wall through the support screws reserved for the first section of the well wall, and fix the hooks reserved for the first section of the well wall to the top of the formwork support system through a hand winch, and 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 construction is carried out in the range of the second section of the well wall, and support screws and hooks are reserved on the outer side and top edge of the steel mesh respectively; while the reinforcement binding construction is in progress, the formwork support system is detached from the support screws reserved in 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 by a hand winch, and the formwork support system is fixed to the designed position for pouring the second section of the well wall by the support screws reserved in the second section of the well wall, and then the hook reserved in the second section of the well wall is fixedly connected to the top of the formwork support system by a hand winch; S5. Concrete pouring Carry out concrete pouring construction of the second section of the shaft wall; S6, repeating steps S3, S4 and S5 in a loop until reaching the designed bottom position of the inverted well.

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 winch to vertically lower the formwork support system.

4. 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 formwork support system is assembled from a number of formwork support components.

5. The inverted well excavation construction method based on the vertical movable support of the formwork support system according to claim 4 is characterized in that: The template support assembly comprises 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 the vertical movable support of the formwork support system according to claim 4 is characterized in that: When each section of the shaft wall is being reinforced with steel bars, 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 winch corresponding to the number of hooks.

7. 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 formwork support system is provided with screw through holes and connection ears which respectively cooperate with the support screws 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 shaft 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 the vertical movable support of the formwork support system according to claim 8 is 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 step S2 and step S5, before the concrete pouring construction, a release agent is evenly applied to the surface of the formwork of the formwork support system.

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