Working pit casting template integrated support frame and working pit construction method

Abstract

The present invention provides an integrated support frame for casting formwork in a working well; it includes several layers of frames, several support assemblies and several longitudinal connecting rods, the several layers of frames are stacked in sequence in the up-and-down direction, and each longitudinal connecting rod is respectively fixed to the telescopic fixed tube of the frame; a rotating chamber is opened in the rotating seat of the support assembly, the end of the screw rod passes through the rotating seat and extends out of the rotating chamber, the end of the screw rod is fixedly connected with a block, and the top support is against the inner side of the corresponding casting formwork. The purpose of flexibly adjusting the diameter of the support frame can be achieved, and the structural stability is high, which is convenient for repeated use. The present invention also provides a method for construction of a working well, including: excavation of foundation pit; precipitation and slope support; excavation of earthwork in the well; steel bar binding and formwork support; erection of support frame and reinforcement of formwork; concrete pouring and maintenance; lifting of the frame and removal of the formwork; cyclic operation until the bottom plate is completed. The efficiency of working well construction is improved, the input of manpower and materials is reduced, and the progress of the project is accelerated.

Description

Technical Field

[0001] The invention relates to an integrated supporting frame for pouring formwork in a working well.

[0002] The invention also relates to a method for constructing a working well. Background Art

[0003] Working pits are generally used for the construction of tunnels or subways in municipal engineering. The working pits of large infrastructure projects are characterized by large diameter and deep depth. In the prior art, the working pit is constructed by digging to a predetermined depth at one time, building scaffolding and casting templates from the bottom of the pit to the upper side of the pit, and then performing casting operations. However, this type of construction is extremely difficult, consumes a lot of manpower and equipment, and has low casting efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an integrated support frame for a working pit casting template that is reasonably structured and recyclable, and a method for constructing a working pit.

[0005] The technical problem to be solved by the present invention is to provide a method for constructing a working well.

[0006] In order to solve the above technical problems, the present invention provides an integrated support frame for pouring formwork in a working pit;

[0007] The invention comprises a plurality of layers of frames, a plurality of supporting assemblies and a plurality of longitudinal connecting rods, wherein the plurality of layers of frames are stacked in the upper and lower directions in sequence, each layer of frames comprises a central ring, a plurality of telescopic rods and at least one group of annular connecting assemblies, and all the telescopic rods are distributed along the central horizontal circumference of the central ring, the telescopic rod comprises a telescopic fixed tube and a telescopic sleeve, the starting end of the telescopic fixed tube is fixedly connected to the side wall of the central ring, the telescopic fixed tube extends horizontally along the radial direction of the central tube, the starting end of the telescopic sleeve extends into the inner hole of the telescopic fixed tube from the end port of the telescopic fixed tube, the end of the telescopic sleeve extends out of the outside of the telescopic fixed tube, the side wall of the telescopic fixed tube is provided with a first through hole, the side wall of the telescopic sleeve is provided with a plurality of second through holes along its axial direction, the pin shaft passes through the first through hole of the telescopic fixed tube and any one of the second through holes of the telescopic sleeve, the annular connecting assembly comprises a plurality of transverse connecting rods, the telescopic fixed tubes of any two adjacent telescopic rods are fixedly connected by the transverse connecting rods, all the transverse connecting rods of each group of annular connecting assemblies are connected end to end in sequence, and each longitudinal connecting rod is fixedly connected to the side walls of the telescopic fixed tubes at corresponding positions of all frames respectively;

[0008] The support assembly is in a one-to-one correspondence with the telescopic rod. The support assembly includes a screw rod, a swivel seat and a top support. A rotating chamber is opened in the swivel seat. The end of the screw rod passes through the swivel seat and extends out of the rotating chamber. A stop block is fixedly connected to the end of the screw rod. The stop block is in the rotating chamber. The top support rests against the inner side of the corresponding casting template.

[0009] As a preferred embodiment of the integrated support frame for the casting formwork of the working pit, a convex ridge that matches the length of the inner opening of the casting formwork extends from the top support of the support assembly.

[0010] As a preferred embodiment of the integrated support frame for casting formwork of the working pit, the telescopic fixed pipe is respectively connected and fixed to the center ring, the corresponding longitudinal connecting rod and the corresponding transverse connecting rod through fasteners.

[0011] When this structure is adopted, the integrated support frame for pouring formwork in the working pit can achieve the purpose of flexibly adjusting the diameter of the support frame compared to the traditional support frame, and has high structural stability and is convenient for repeated use.

[0012] In order to solve the above technical problems, the present invention provides a method for completing the construction of a working well by using the above working well casting template integrated support frame, comprising the following steps:

[0013] a) Excavation of the upper foundation pit: Determine the excavation line of the well according to the survey and layout, excavate the upper soil layer, use a backhoe excavator, and assist with manual leveling;

[0014] b) Dewatering and slope support: The underground water level in the working well construction area is relatively high, so the pipe jacking well needs to be dewatered before construction. After the upper foundation pit is excavated, the slope soil nail wall support is carried out according to the requirements of the drawings. The working well is divided into several specified depths, and excavation and pouring are carried out one by one;

[0015] c) Excavation of earthwork in the well: The earthwork in the well is excavated, hoisted and trimmed manually. After the well is dug to the specified depth, use a support rod to check whether the well is vertical and smooth, and trim the well wall;

[0016] d) Steel bar binding and formwork support: After the well wall earthwork is trimmed and passed the acceptance, the well wall steel bar binding is carried out. The overlapping sections of the steel bars should be staggered according to the requirements of the specification. After the steel bar binding is completed, the formwork support is carried out, and the steel formwork is used for support;

[0017] e) Support frame erection and formwork reinforcement: erect an integrated support frame for the working well casting formwork outside the well, adjust the extension position of the telescopic sleeve and the screw of the integrated support frame for the working well casting formwork, so that the top support of the integrated support frame for the working well casting formwork is at the minimum extension stroke position, and hoist it into the wellhead, the integrated support frame for the working well casting formwork is at the center of the working well, and build the casting formwork along the circumference of the integrated support frame for the working well casting formwork, adjust the extension position of the telescopic sleeve and the screw of the integrated support frame for the working well casting formwork again, and the top support of the integrated support frame for the working well casting formwork is against the inner side of the corresponding casting formwork;

[0018] f) Concrete pouring, curing, and formwork reinforcement: The first section of concrete should be poured immediately after acceptance, and concrete curing should be strengthened after pouring;

[0019] g) Lifting the frame and removing the formwork: When the concrete reaches 75% of the design strength at this stage, shrink all the screws of the integrated support frame for the working well casting formwork, so that the integrated support frame for the working well casting formwork is not in contact with the casting formwork, use a crane to lift the integrated support frame for the working well casting formwork out of the well as a whole, and then remove the formwork and lift it to the yard for stacking;

[0020] h) Repeat the operation until the bottom plate is completed: Repeat steps c) to g), and repeat the operation downward layer by layer, dig the working well to the designed depth below the bottom plate of the well, remove the loose soil, and complete the reinforced concrete construction of the bottom plate and the sump.

[0021] After adopting this method, combined with the integrated support frame for casting the working pit formwork, the efficiency of the working pit construction was improved, the input of manpower and materials was reduced, and the progress of the project was accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a stereoscopic diagram of an embodiment of the integrated support frame for casting formwork in the working pit.

[0023] Figure 2 It is a structural schematic diagram of the central ring, telescopic rod, support assembly and longitudinal connecting rod of the integrated support frame for pouring formwork in the working pit.

[0024] Figure 3 It is a cross-sectional view of the telescopic rod and the supporting assembly of the integrated supporting frame for the working pit casting formwork according to the present embodiment.

[0025] Figure 4 It is a process flow chart of an embodiment of the method for working pit construction. DETAILED DESCRIPTION

[0026] like Figures 1 to 3 Shown

[0027] The integrated support frame for casting formwork of the working pit includes a three-layer frame, sixty groups of support components 6 and a plurality of longitudinal connecting rods 51.

[0028] The three-layer frame is stacked in the upper and lower directions in sequence, and each layer of the frame includes a central ring 1, twenty telescopic rods and three groups of annular connection components. All the telescopic rods are evenly distributed along the central level of the central ring 1. The telescopic rod includes a telescopic fixed tube 21 and a telescopic sleeve 22. The starting end of the telescopic fixed tube 21 is fixedly connected to the side wall of the central ring 1, and the telescopic fixed tube 21 extends horizontally along the radial direction of the central tube. The starting end of the telescopic sleeve 22 extends into the inner hole of the telescopic fixed tube 21 from the end port of the telescopic fixed tube 21, and the end of the telescopic sleeve 22 extends out of the outside of the telescopic fixed tube 21. A first through hole is opened on the side wall of the telescopic fixed tube 21, and a plurality of second through holes 22a are opened on the side wall of the telescopic sleeve 22 along its axial direction. The pin 3 passes through the first through hole of the telescopic fixed tube 21 and any one of the second through holes 22a of the telescopic sleeve 22.

[0029] Each annular connection assembly includes twenty transverse connecting rods 41, and the telescopic fixing tubes 21 of any two adjacent telescopic rods are fixed by the transverse connecting rods 41 through fasteners. All the transverse connecting rods 41 of each group of annular connection assemblies are connected end to end in sequence to roughly form a circle, and the diameters of the circles where the three groups of annular connection assemblies are located are different.

[0030] Each longitudinal connecting rod 51 is fixed to the side wall of the corresponding telescopic fixed tube 21 of the three-layer frame through fasteners (not shown in the figure, and the fasteners are all conventional structures), and each telescopic fixed tube 21 is fixed to eight longitudinal connecting rods 51.

[0031] The support assembly 6 corresponds to the telescopic rod in a one-to-one relationship. Each group of support assemblies 6 includes a screw rod 61, a swivel seat 62 and a top support 63. The screw rod 61 extends into the telescopic sleeve 22 from the end port of the telescopic sleeve 22 of the corresponding telescopic rod. The screw rod 61 is threadedly matched with the inner hole of the telescopic sleeve 22. A stopper 61a is fixedly connected to the end of the screw rod 61. The swivel seat 62 includes a cover plate 62a and a seat body 62b. The seat body 62b is welded on the top support 63, and the seat body 62b is away from A groove is provided on the side wall of one side of the top support 63, and a through hole is provided on the cover plate 62a for only the wire to pass through. A rotating chamber 62c in which the stopper 61a can rotate freely is formed between the cover plate 62a and the seat body 62b. The end of the screw rod 61 passes through the rotating seat 62 and extends out of the rotating chamber 62c. The stopper 61a is in the rotating chamber 62c. A convex ridge 63a that matches the length of the inner opening of the casting template extends from the top support 63, and the top support 63 rests against the corresponding inner side of the casting template.

[0032] like Figure 4 Shown

[0033] The method for completing the construction of a working well using the above-mentioned working well casting template integrated support frame comprises the following steps:

[0034] a) Excavation of the upper foundation pit: Determine the excavation line of the well according to the survey and layout, excavate the upper 2m of earthwork, use a backhoe excavator, and assist with manual leveling;

[0035] b) Dewatering and slope support: The underground water level in the working well construction area is relatively high, and the top pipe well needs to be dewatered before construction. According to the soil layer and underground water level of the site, it is planned to set up 4 dewatering wells with a diameter of 800mm and a depth of 20m at 2.5m outside the inverted wall well to dewater the pipe well to 1m below the lowest working surface. After the upper foundation pit is excavated, the slope soil nail wall support will be carried out according to the requirements of the drawings. The working well is divided into several specified depths, and excavation and pouring are carried out one by one;

[0036] c) Excavation of earthwork in the well: The earthwork in the well is manually excavated, hoisted and trimmed. Starting from the second section, the earth is transported by lifting equipment. The personnel in the well should wear safety helmets, and the personnel on the ground should wear safety belts. When the bucket is 1.5m above the wellhead, the movable safety cover 62a is pushed to cover the hole to prevent the unloaded soil, stones and other debris from falling into the hole and injuring people. After the well is dug to the specified depth, the support rod is used to check whether the well is vertical and smooth, and the well wall is trimmed;

[0037] d) Steel bar binding and formwork support: After the well wall earthwork is trimmed and passed the acceptance, the well wall steel bar binding is carried out. The overlapping sections of the steel bars should be staggered according to the requirements of the specification. After the steel bar binding is completed, the formwork support is carried out, and the 80*43*5cm steel formwork is used for support;

[0038] e) Support frame erection and template reinforcement: an integrated support frame for the working well casting template is erected outside the well, and the extension position of the telescopic sleeve 22 and the screw 61 of the integrated support frame for the working well casting template is adjusted so that the top support 63 of the integrated support frame for the working well casting template is at the minimum extension stroke position, and the integrated support frame for the working well casting template is hoisted into the wellhead, and the integrated support frame for the working well casting template is at the center of the working well, and the casting template is erected along the circumference of the integrated support frame for the working well casting template, and the extension position of the telescopic sleeve 22 and the screw 61 of the integrated support frame for the working well casting template is adjusted again, and the top support 63 of the integrated support frame for the working well casting template is against the inner side of the corresponding casting template;

[0039] f) Concrete pouring, curing, and formwork reinforcement: The first section of concrete should be poured immediately after acceptance. During pouring, the vibrator should be at least 5 cm away from the outer soil formwork to avoid the collapse of the well wall caused by vibration. After pouring, the concrete curing should be strengthened to ensure the strength of the concrete in the next step;

[0040] g) Lifting the frame and removing the formwork: When the first section of concrete reaches 75% of the design strength, retract all the screws 61 of the integrated support frame for the working well casting formwork, so that the integrated support frame for the working well casting formwork is not in contact with the casting formwork, and use a 25T crane to lift the integrated support frame for the working well casting formwork out of the well as a whole, and then remove the formwork and lift it to the yard for stacking;

[0041] h) Cycle the operation until the base plate is completed: Repeat steps c) to g). After the first section of the formwork is removed, the next section of earth excavation, steel bar binding, and formwork support will be carried out in the well. The previous working well casting formwork integrated support frame will be lifted into the well by a crane and fixed and the formwork will be reinforced. Finally, concrete will be poured. The operation will be cycled downward layer by layer, and the diameter of the working well casting formwork and the working well casting formwork integrated support frame will be reduced layer by layer until the working well is dug to the designed depth below the base plate of the well, the loose soil will be removed, and the reinforced concrete construction of the base plate and the sump will be completed.

[0042] Among them, the jacking process adopts mud balance or earth pressure balance, and the working shaft wall is designed for reverse construction. The working shaft is a circular inverted wall shaft with an inner diameter of 8m and a wall thickness of 50cm. The shallowest depth of the shaft is 5.044m and the deepest is 10.865m.

[0043] The above is only one embodiment of the present invention. It should be pointed out that a person skilled in the art may make several modifications and improvements without departing from the principle of the present invention, and these should also be regarded as falling within the scope of protection of the present invention.

Claims

1. An integrated support frame for pouring formwork in a working pit, characterized by: The invention comprises a plurality of layers of frames, a plurality of supporting assemblies and a plurality of longitudinal connecting rods, wherein the plurality of layers of frames are stacked in the upper and lower directions in sequence, each layer of frames comprises a central ring, a plurality of telescopic rods and at least one group of annular connecting assemblies, and all the telescopic rods are distributed along the central horizontal circumference of the central ring, the telescopic rod comprises a telescopic fixed tube and a telescopic sleeve, the starting end of the telescopic fixed tube is fixedly connected to the side wall of the central ring, the telescopic fixed tube extends horizontally along the radial direction of the central tube, the starting end of the telescopic sleeve extends into the inner hole of the telescopic fixed tube from the end port of the telescopic fixed tube, the end of the telescopic sleeve extends out of the outside of the telescopic fixed tube, the side wall of the telescopic fixed tube is provided with a first through hole, the side wall of the telescopic sleeve is provided with a plurality of second through holes along its axial direction, the pin shaft passes through the first through hole of the telescopic fixed tube and any one of the second through holes of the telescopic sleeve, the annular connecting assembly comprises a plurality of transverse connecting rods, the telescopic fixed tubes of any two adjacent telescopic rods are fixedly connected by the transverse connecting rods, all the transverse connecting rods of each group of annular connecting assemblies are connected end to end in sequence, and each longitudinal connecting rod is fixedly connected to the side walls of the telescopic fixed tubes at corresponding positions of all frames respectively; The support assembly is in a one-to-one correspondence with the telescopic rod, and the support assembly includes a screw rod, a swivel seat and a top support. The screw rod extends from the end port of the telescopic sleeve of the corresponding telescopic rod into the telescopic sleeve, and the screw rod is threadedly matched with the inner hole of the telescopic sleeve. The swivel seat is fixedly connected to the top support, and a rotating chamber is opened in the swivel seat. The end of the screw rod passes through the swivel seat and extends out of the rotating chamber. The end of the screw rod is fixedly connected to a stopper, and the stopper is in the rotating chamber. The top support abuts against the inner side of the corresponding casting template; The top support of the support assembly is provided with a convex ridge that matches the length of the inner opening of the casting template; The telescopic fixing tube is respectively connected and fixed to the central ring, the corresponding longitudinal connecting rod, and the corresponding transverse connecting rod through fasteners.

2. A method for completing the construction of a working well using the integrated support frame for pouring formwork for a working well as claimed in claim 1, comprising the following steps: a) Excavation of the upper foundation pit: Determine the excavation line of the well according to the survey and layout, excavate the upper soil layer, use a backhoe excavator, and assist with manual leveling; b) Dewatering and slope support: The underground water level in the working well construction area is relatively high, so the pipe jacking well needs to be dewatered before construction. After the upper foundation pit is excavated, the slope soil nail wall support is carried out according to the requirements of the drawings. The working well is divided into several specified depths, and excavation and pouring are carried out one by one; c) Excavation of earthwork in the well: The earthwork in the well is excavated, hoisted and trimmed manually. After the well is dug to the specified depth, use a support rod to check whether the well is vertical and smooth, and trim the well wall; d) Steel bar binding and formwork support: After the well wall earthwork is trimmed and passed the acceptance, the well wall steel bar binding is carried out. The overlapping sections of the steel bars should be staggered according to the requirements of the specification. After the steel bar binding is completed, the formwork support is carried out, and the steel formwork is used for support; e) Support frame erection and formwork reinforcement: erect an integrated support frame for the working well casting formwork outside the well, adjust the extension position of the telescopic sleeve and the screw of the integrated support frame for the working well casting formwork, so that the top support of the integrated support frame for the working well casting formwork is at the minimum extension stroke position, and hoist it into the wellhead, the integrated support frame for the working well casting formwork is at the center of the working well, and build the casting formwork along the circumference of the integrated support frame for the working well casting formwork, adjust the extension position of the telescopic sleeve and the screw of the integrated support frame for the working well casting formwork again, and the top support of the integrated support frame for the working well casting formwork is against the inner side of the corresponding casting formwork; f) Concrete pouring, curing, and formwork reinforcement: The first section of concrete should be poured immediately after acceptance, and concrete curing should be strengthened after pouring; g) Lifting the frame and removing the formwork: When the concrete reaches 75% of the design strength at this stage, shrink all the screws of the integrated support frame for the working well casting formwork, so that the integrated support frame for the working well casting formwork is not in contact with the casting formwork, use a crane to lift the integrated support frame for the working well casting formwork out of the well as a whole, and then remove the formwork and lift it to the yard for stacking; h) Repeat the operation until the bottom plate is completed: Repeat steps c) to g), and repeat the operation downward layer by layer, dig the working well to the designed depth below the bottom plate of the well, remove the loose soil, and complete the reinforced concrete construction of the bottom plate and the sump.

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