Comprehensive prevention and control system and construction method for deformation of steel casing of pile foundation in complex karst geology

Abstract

The present invention relates to a comprehensive deformation prevention and control system for steel casings in complex karst geological conditions, and a construction method. The system comprises the following steps: deformation prevention and control technology for steel casings during sinking and reinforcement of the borehole, deformation correction technology using a jack in the borehole, grouting and sealing technology using bags on the outer side of the steel casing, support technology for steel casing deformation sections using a steel frame, and a hole-opening hanging and lifting safety operation platform. The present invention has the beneficial effects of improving the strength of the steel casing, facilitating jack correction, and ensuring operator safety. Furthermore, the system can prevent hole collapse and hammer jamming, while reducing pollution to the surrounding environment, saving manpower and costs, and achieving high construction efficiency. Application in actual projects can yield good technical and economic benefits.

Description

Technical Field

[0001] The present invention belongs to the field of bridge engineering, and in particular relates to a comprehensive prevention and control system for deformation of steel casings of pile foundations in complex karst geology and a construction method. Background Art

[0002] During bridge pile foundation construction, adverse geological conditions often necessitate the burial of steel casings to a certain depth. These casings not only protect the bored piles from collapse but also, as a permanent part of the pile foundation, bear some of the load. Karst areas are widespread throughout my country, and the design and construction of bridge pier pile foundations inevitably present a range of karst engineering geology challenges. Impact piles are widely used in engineering due to their high bearing capacity, adaptability, reasonable cost, and ease of construction. Impact piles are particularly popular in karst areas. Failure to promptly and effectively address deformation of the steel casing during construction can lead to increased project costs, construction delays, and even unforeseen accidents.

[0003] However, the construction quality and efficiency of steel casing construction in complex karst geological pile foundations were low in the past. There is an urgent need for a new construction method of a comprehensive deformation prevention and control system for steel casing deformation in complex karst geological pile foundations to improve construction efficiency and quality, and ensure a safe and reliable construction process. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a comprehensive prevention and control system for deformation of steel casings in complex karst geological pile foundations and a construction method.

[0005] This comprehensive deformation prevention and control system for pile foundation steel casings in complex karst geology includes a deformation prevention and control system for steel casings reinforced by sinking the lead hole, a deformation correction device for a jack in the hole, a grouting and sealing system for a bag on the outside of the steel casing, a steel support frame, and a hole-opening hanging and lifting safety operation platform; the deformation prevention and control system for steel casings reinforced by sinking the lead hole includes a steel casing with an internal support frame and a reinforcing ring plate inside the steel casing, the steel casing is sunk in the pile hole, and there is a steel casing deformation zone on the side wall of the steel casing; the deformation correction device for a jack in the hole is arranged at the bottom end of the steel casing; the grouting and sealing system for the bag on the outside of the steel casing includes a bag filled with mortar, and the bag is placed between the steel casing deformation zone and the hole wall of the lead hole; the steel support frame is fixed at the steel casing deformation zone inside the steel casing; and the hole-opening hanging and lifting safety operation platform is hoisted inside the steel casing.

[0006] Preferably, the deformation prevention and control system for the bored hole sinking reinforced steel casing includes an inner support frame and a reinforcing ring plate. The inner support frame is arranged inside the steel casing, and reinforcing ring plates are connected to the outer sides of the top and bottom of the steel casing.

[0007] Preferably, the in-hole jack deformation correction device includes a square pad, a rectangular fixing block and a jack, the square pad is fixed to the bottom end of the steel casing by fixing nails, the rectangular fixing block is fixed to the square pad, and the jacks are symmetrically arranged on the four side walls of the rectangular fixing block.

[0008] Preferably, the bladder grouting and sealing system on the outer side of the steel casing includes a pumping pipe, a pump and a mortar pool; the bladder is connected to the pumping pipe, one end of the pumping pipe is connected to the bladder, and the other end of the pumping pipe is connected to the pump, the pump is arranged in the mortar pool, and the mortar pool is arranged on the ground outside the pile hole.

[0009] Preferably, the steel support frame includes edge support steel, connecting support steel, mid-span support steel and separating support steel. The multiple steel support frames are arranged inside the deformation zone of the steel casing. The edge support steel is arranged on the inner side of the steel support frame and contacts the inner wall of the deformation zone of the steel casing. One end of the mid-span support steel is fixed on the edge support steel, and the other end of the mid-span support steel is fixed on the steel casing; a connecting support steel is provided on both sides of the mid-span support steel, one end of the connecting support steel is fixed to the end of the edge support steel, and the other end of the connecting support steel is fixed to the mid-span support steel; one end of the separating support steel is fixed to the edge support steel, and the other end of the separating support steel is fixed to the connecting support steel.

[0010] Preferably, the hole-mouth hanging and lifting safety operating platform includes an electric lifting hoist, an electric lifting hoist fixing, a lifting chain and an operating platform. Fixed pads are symmetrically fixed to the top of the steel casing, support vertical rods are fixed on the fixed pads, and support cross rods are connected between the support vertical rods. The electric lifting hoist is fixed to the support cross rod through the electric lifting hoist fixing. Protective vertical rods are provided around the operating platform, and protective cross rods are provided on the top of the protective vertical rods. Protective diagonal rods are provided between the protective vertical rods. One end of the lifting chain is set on the electric lifting hoist, and the other end of the lifting chain is fixed on the protective cross rod.

[0011] The construction method of this complex karst geological pile foundation steel casing deformation comprehensive prevention and control system includes the following steps:

[0012] Step 1: Install the inner support frame and reinforcing ring plate in the steel casing, then sink the steel casing through the hole, and then install the steel support frame from top to bottom in the deformation area of ​​the steel casing;

[0013] Step 2: Set up a bag grouting and plugging system on the outside of the steel casing, set a bag between the deformation area of ​​the steel casing and the hole wall, and inject mortar into the bag;

[0014] Step 3: After installing the hole-hanging and lifting safety operation platform, cut the deformed part of the steel casing;

[0015] Step 4: The in-hole jack deformation correction device corrects the verticality of the steel casing by adjusting the jacks around it.

[0016] Preferably, the bladder bag grouting and sealing system on the outside of the steel casing includes a pumping pipe, a pump and a mortar pool; the bag is connected to the pumping pipe, one end of the pumping pipe is connected to the bag, and the other end of the pumping pipe is connected to the pump, the pump is arranged in the mortar pool, and the mortar pool is arranged on the ground outside the inlet hole; in step two, the mortar is injected into the bag through the pumping pipe by using the pump.

[0017] The beneficial effects of the present invention are:

[0018] 1) The present invention adopts a deformation prevention and control system for reinforced steel casing during hole sinking, which improves the strength of the steel casing and reduces the possibility of deformation during the sinking process of the steel casing.

[0019] 2) The present invention adopts an in-hole jack deformation correction device for construction, which is simple to operate, effectively ensures the verticality of the steel casing, and has high construction efficiency.

[0020] 3) The present invention performs sealing construction through a bag grouting sealing system on the outer side of the steel casing, which has a good sealing effect and ensures that no hole collapse or hammer jamming occurs during the construction process.

[0021] 4) The present invention adopts a steel casing deformation section type steel frame support structure for construction, which effectively prevents the steel casing from further deformation.

[0022] 5) The present invention uses a safety operating platform suspended from the hole for construction, which is easy to lift and lower, provides a safe and convenient operating platform for on-site workers, and improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the front view of the deformation prevention and control system structure of the guide hole sinking reinforcement steel casing;

[0024] Figure 2 This is a top view of the deformation prevention and control system structure of the guide hole sinking reinforcement steel casing;

[0025] Figure 3 This is a front view of the structure of the in-hole jack deformation correction device;

[0026] Figure 4 This is a top view of the structure of the in-hole jack deformation correction device;

[0027] Figure 5 This is a schematic diagram of the grouting and plugging system structure of the outer side of the steel casing;

[0028] Figure 6 This is the front view of the steel frame support structure of the steel casing deformation section;

[0029] Figure 7This is a top view of the steel frame support structure of the steel casing deformation section;

[0030] Figure 8 This is the front view of the hole-hanging and lifting safety operation platform structure;

[0031] Figure 9 It is a side view of the hole-hanging and lifting safety operation platform structure.

[0032] Explanation of the accompanying numbers: 1-steel casing, 2-inner support frame, 3-reinforcement ring plate, 4-square pad, 5-fixing nail, 6-rectangular fixing block, 7-jack, 8-hole wall, 9-steel casing deformation zone, 10-bag, 11-mortar, 12-pumping pipe, 13-pump, 14-mortar pool, 15-steel support frame, 16-edge support steel, 17-connecting support steel, 18-mid-span support steel, 19-partition support steel, 20-fixed pad, 21-support vertical frame, 22-support cross bar, 23-electric lifting hoist, 24-electric lifting hoist fixings, 25-lifting chain, 26-operating platform, 27-protective vertical pole, 28-protective diagonal pole, 29-protective cross bar. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to the following examples. The following examples are provided only to facilitate understanding of the present invention. It should be noted that, without departing from the principles of the present invention, it is possible for a person skilled in the art to make various modifications to the present invention, and such improvements and modifications fall within the scope of the claims of the present invention.

[0034] Example 1

[0035] As an embodiment, a comprehensive prevention and control system for deformation of steel casing of pile foundation in complex karst geology is proposed, such as Figures 1 to 9 As shown, it includes a deformation prevention and control system for the steel casing reinforced by sinking the lead hole, a deformation correction device for the jack in the hole, a bladder grouting and sealing system for the outer side of the steel casing, a steel support frame 15 and a hole-opening hanging and lifting safety operation platform; the deformation prevention and control system for the steel casing reinforced by sinking the lead hole includes a steel casing 1, an inner support frame 2 and a reinforcing ring plate 3 are arranged inside the steel casing 1, the steel casing 1 is sunk in the pile hole, and a steel casing deformation area 9 is arranged on the side wall of the steel casing 1; the deformation correction device for the jack in the hole is arranged at the bottom end of the steel casing 1; the bladder grouting and sealing system for the outer side of the steel casing includes a bag 10, the bag 10 is filled with mortar 11, and the bag 10 is placed between the steel casing deformation area 9 and the hole wall 8 of the lead hole; the steel support frame 15 is fixed at the steel casing deformation area 9 inside the steel casing 1; the hole-opening hanging and lifting safety operation platform is hoisted inside the steel casing 1.

[0036] Figure 1 This is the front view of the deformation prevention and control system structure of the steel casing for sinking the lead hole. Figure 2This is a top view of the deformation prevention and control system structure of the sinking reinforcement steel casing, Figure 3 This is the front view of the hole jack deformation correction device structure, Figure 4 This is a top view of the structure of the jack deformation correction device in the hole. Figure 5 This is a schematic diagram of the steel casing outer bag grouting plugging system structure. Figure 6 This is the front view of the steel casing deformation section steel frame support structure, Figure 7 It is a top view of the steel casing deformation section steel frame support structure, Figure 8 This is the front view of the hole-hanging lifting safety operation platform structure. Figure 9 It is a side view of the hole-hanging and lifting safety operation platform structure.

[0037] like Figure 1 and Figure 2 As shown, the deformation prevention and control system for the bored hole sinking reinforced steel casing includes an inner support frame 2 and a reinforcing ring plate 3. The inner support frame 2 is arranged inside the steel casing 1, and the outer sides of the top and bottom of the steel casing 1 are connected to the reinforcing ring plates 3.

[0038] like Figure 3 and Figure 4 As shown, the jack deformation correction device includes a square pad 4, a fixing nail 5, a rectangular fixing block 6, and a jack 7. The square pad 4 is fixed to the bottom end of the steel casing 1 through the fixing nail 5, and the rectangular fixing block 6 is fixed on the square pad 4. The jacks 7 are symmetrically arranged on the four side walls of the rectangular fixing block 6.

[0039] like Figure 5 As shown, the bag grouting and plugging system on the outside of the steel casing includes a bag 10, mortar 11, a pumping pipe 12, a pump 13, and a mortar pool 14; the steel casing 1 is on the inner side of the hole wall 8, the bag 10 is arranged in the deformation zone 9 of the steel casing, the mortar 11 is arranged in the bag 10, the bag 10 is connected to the pumping pipe 12, one end of the pumping pipe 12 is connected to the bag 10, and the other end of the pumping pipe 12 is connected to the pump 13, the pump 13 is arranged in the mortar pool 14, and the mortar pool 14 is arranged on the ground outside the pile hole.

[0040] Example 2

[0041] As another embodiment, this embodiment 2 proposes, on the basis of embodiment 1, a more specific comprehensive prevention and control system for deformation of steel casing of pile foundation in complex karst geology.

[0042] like Figure 6 and Figure 7As shown, the steel support frame 15 includes a side support steel 16, a connecting support steel 17, a mid-span support steel 18 and a separating support steel 19. The multiple steel support frames 15 are arranged inside the deformation zone 9 of the steel casing. The side support steel 16 is arranged on the inner side of the steel support frame 15 and contacts the inner wall of the deformation zone 9 of the steel casing. One end of the mid-span support steel 18 is fixed on the side support steel 16, and the other end of the mid-span support steel 18 is fixed on the steel casing 1; a connecting support steel 17 is provided on both sides of the mid-span support steel 18, one end of the connecting support steel 17 is fixed to the end of the side support steel 16, and the other end of the connecting support steel 17 is fixed to the mid-span support steel 18; one end of the separating support steel 19 is fixed to the side support steel 16, and the other end of the separating support steel 19 is fixed to the connecting support steel 17.

[0043] like Figure 8 and Figure 9 As shown, the hole-hanging lifting safety operating platform includes a fixed pad 20, a support vertical rod 21, a support cross bar 22, an electric lifting hoist 23, an electric lifting hoist fixing 24, a lifting chain 25, an operating platform 26, a protective vertical rod 27, a protective diagonal rod 28, and a protective cross bar 29; the top of the steel casing 1 is symmetrically fixed with a fixed pad 20, the fixed pad 20 is fixed with a support vertical rod 21, and the support vertical rods 21 are connected with support cross bars 22. The electric lifting hoist 23 is fixed to the support cross bar 22 through the electric lifting hoist fixing 24, and the operating platform 26 is provided with protective vertical rods 27 around. The top of the protective vertical rod 27 is provided with a protective cross bar 29, and a protective diagonal rod 28 is provided between the protective vertical rods 27. One end of the lifting chain 25 is set on the electric lifting hoist 23, and the other end of the lifting chain 25 is fixed on the protective cross bar 29.

[0044] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0045] Example 3

[0046] As another embodiment, this embodiment 3 proposes, based on the embodiment 2, a construction method of a comprehensive prevention and control system for deformation of a pile foundation steel casing in complex karst geology, such as Figures 1 to 9 As shown, the following steps are included:

[0047] Step 1: Install the inner support frame 2 and the reinforcing ring plate 3 in the steel casing 1, then sink the steel casing 1 through the hole, and then install the steel support frame 15 from top to bottom in the deformation area 9 of the steel casing;

[0048] Step 2: Set up a bag grouting and plugging system on the outside of the steel casing. Set a bag 10 between the deformation area 9 of the steel casing and the hole wall 8, and inject mortar 11 into the bag 10;

[0049] Step 3: After installing the hole-hanging and lifting safety operation platform, cut the deformed part of the steel casing 1;

[0050] Step 4: The in-hole jack deformation correction device corrects the verticality of the steel casing 1 by adjusting the jacks 7 around it.

[0051] In step one, construction preparation: familiarize yourself with the construction process, brief on-site technical personnel, level the site, and bring in relevant materials and equipment; steel casing sinking construction: when the steel casing 1 is produced in the factory, an internal support frame 2 is set inside it, and reinforcing ring plates 3 are set at the top and bottom of the steel casing 1. After completion, it is transported to the site and the steel casing 1 is sunk after drilling.

[0052] In step 2, the steel frame in the deformation zone of the steel casing is constructed: for the deformation zone 1 of the steel casing, since the outer side of the steel casing 1 is under greater pressure, in order to prevent further deformation, a steel support frame 15 is set from top to bottom in the deformation zone 9 of the steel casing. The plane layout of the steel support frame 15 includes edge support steel 16, connecting support steel 17, mid-span support steel 18, and separating support steel 19. The edge support steel 16 is set near the deformation zone 9 of the steel casing. One end of the mid-span support steel 18 is fixed on the edge support steel 16 and the other end is fixed on the steel casing 1. One end of the connecting support steel 17 is fixed on the edge support steel 16 and the other end is fixed on the mid-span support steel 18. One end of the separating support steel 19 is fixed on the edge support steel 16 and the other end is fixed on the connecting support steel 17.

[0053] In step 2, grouting and sealing construction is carried out on the outside of the steel casing: the bag grouting and sealing system on the outside of the steel casing includes a pumping pipe 12, a pump 13 and a mortar pool 14; the bag 10 is connected to the pumping pipe 12, one end of the pumping pipe 12 is connected to the bag 10, and the other end of the pumping pipe 12 is connected to the pump 13, the pump 13 is arranged in the mortar pool 14, and the mortar pool 14 is arranged on the ground outside the inlet hole; the mortar 11 is injected into the bag 10 through the pumping pipe 12 by the pump 13.

[0054] In step three, steel casing cutting construction: install the hole mouth hanging lifting safety operation platform, the fixed pad 20 is fixed on the top of the steel casing 1, the support vertical rod 21 is fixed on the fixed pad 20, the support cross bar 22 connects the support vertical rods 21 on both sides, the electric lifting hoist 23 is fixed on the support cross bar 22 through the electric lifting hoist fixing 24, one end of the lifting chain 25 is set on the electric lifting hoist 23, and the other end is fixed on the protective cross bar 29, the protective vertical rod 27 is set on the operating platform 26, the protective diagonal rod 28 connects the protective vertical rods 27 on both sides, and the protective cross bar 29 is set on the top of the protective vertical rod 27. The construction personnel perform cutting construction on the deformed part of the steel casing 1 on the operating platform.

[0055] In step four, the deformation correction construction of the steel casing is carried out: after the deformation of the steel casing is completed, the overall verticality of the steel casing needs to be corrected. The square pad 4 is fixed to the bottom end of the steel casing 1 by the fixing nail 5, and the rectangular fixing block 6 is fixed on the square pad 4. The jack 7 is set on the rectangular fixing block 6, and the jack deformation correction device is assembled in the hole. By adjusting the jacks around, it is ensured that the verticality of the steel casing 1 meets the requirements. After inspection and acceptance, the relevant equipment is withdrawn.

[0056] It should be noted that the parts in this embodiment that are the same or similar to those in the second embodiment can be referenced to each other and will not be described in detail in this application.

[0057] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A comprehensive prevention and control system for deformation of steel casing of pile foundation in complex karst geology, characterized by: It includes a deformation prevention and control system for the steel casing reinforced by sinking the lead hole, a deformation correction device for the jack in the hole, a grouting and plugging system for the bag outside the steel casing, a steel support frame and a hole opening hanging and lifting safety operation platform; the deformation prevention and control system for the steel casing reinforced by sinking the lead hole includes a steel casing, an internal support frame and a reinforcing ring plate inside the steel casing, the steel casing is sunk in the pile hole, and a steel casing deformation area is provided on the side wall of the steel casing; the deformation correction device for the jack in the hole is arranged at the bottom end of the steel casing; the deformation correction device for the jack in the hole includes a square pad, a rectangular fixing block and a jack, the square pad is fixed to the bottom end of the steel casing by a fixing nail, the rectangular fixing block is fixed to the square pad, and jacks are symmetrically arranged on the four side walls of the rectangular fixing block; The bag grouting sealing system on the outside of the steel casing includes a bag filled with mortar, and the bag is placed between the deformation zone of the steel casing and the wall of the lead hole; the steel support frame is fixed to the deformation zone of the steel casing inside the steel casing; the hole mouth hanging and lifting type safety operation platform is hoisted inside the steel casing; the hole mouth hanging and lifting type safety operation platform includes an electric lifting hoist, an electric lifting hoist fixing, a lifting chain and an operation platform, the top of the steel casing is symmetrically fixed with fixed pads, the fixed pads are fixed with support vertical rods, and support cross rods are connected between the support vertical rods. The electric lifting hoist is fixed to the support cross rod by the electric lifting hoist fixing, and protective vertical rods are provided around the operation platform, and a protective cross rod is provided on the top of the protective vertical rod, and a protective diagonal rod is provided between the protective vertical rods. One end of the lifting chain is set on the electric lifting hoist, and the other end of the lifting chain is fixed on the protective cross rod.

2. The comprehensive prevention and control system for deformation of steel casing of pile foundation in complex karst geology according to claim 1 is characterized in that: The deformation prevention and control system for the bored hole sinking and reinforced steel casing includes an inner support frame and a reinforcing ring plate. The inner support frame is arranged inside the steel casing, and the outer sides of the top and bottom of the steel casing are connected to the reinforcing ring plates.

3. The comprehensive prevention and control system for deformation of steel casing of pile foundation in complex karst geology according to claim 1 is characterized in that: The bladder bag grouting and sealing system on the outside of the steel casing includes a pumping pipe, a pump and a mortar pool; the bladder is connected to the pumping pipe, one end of the pumping pipe is connected to the bladder, and the other end of the pumping pipe is connected to the pump, the pump is arranged in the mortar pool, and the mortar pool is arranged on the ground outside the pile hole.

4. The comprehensive prevention and control system for deformation of steel casings in complex karst geological pile foundations according to claim 1 is characterized in that: The steel support frame includes edge support steel, connecting support steel, mid-span support steel and separation support steel. The multiple steel support frames are arranged inside the deformation zone of the steel casing. The edge support steel is arranged on the inner side of the steel support frame and contacts the inner wall of the deformation zone of the steel casing. One end of the mid-span support steel is fixed to the edge support steel, and the other end of the mid-span support steel is fixed to the steel casing. A connecting support steel is provided on both sides of the mid-span support steel, one end of the connecting support steel is fixed to the end of the side support steel, and the other end of the connecting support steel is fixed to the mid-span support steel; one end of the separating support steel is fixed to the side support steel, and the other end of the separating support steel is fixed to the connecting support steel.

5. The construction method of the complex karst geological pile foundation steel casing deformation comprehensive prevention and control system according to claim 1 is characterized in that: The following steps are involved: Step 1: Install the inner support frame and reinforcing ring plate in the steel casing, then sink the steel casing through the hole, and then install the steel support frame from top to bottom in the deformation area of ​​the steel casing; Step 2: Set up a bag grouting and plugging system on the outside of the steel casing, set a bag between the deformation area of ​​the steel casing and the hole wall, and inject mortar into the bag; Step 3: After installing the hole opening hanging and lifting safety operation platform, cut the deformed part of the steel casing; Step 4: The in-hole jack deformation correction device corrects the verticality of the steel casing by adjusting the jacks around it.

6. The construction method of the complex karst geological pile foundation steel casing deformation comprehensive prevention and control system according to claim 5 is characterized in that: The bladder bag grouting and sealing system on the outside of the steel casing includes a pumping pipe, a pump and a mortar pool; the bladder bag is connected to the pumping pipe, one end of the pumping pipe is connected to the bladder bag, and the other end of the pumping pipe is connected to the pump, the pump is set in the mortar pool, and the mortar pool is set on the ground outside the inlet hole; in step two, the mortar is injected into the bladder bag through the pumping pipe by using the pump.

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