A construction support structure for cast-in-place beam in deep soft soil area

Abstract

The application relates to the field of bridge engineering and discloses a cast-in-situ beam construction support structure for deep soft soil areas, which comprises a permanent structure pier column for supporting an overall device, the upper surface of the permanent structure pier column is provided with a Bailey beam, the lower surface of the Bailey beam is provided with a support piece, the lower surface of the support piece is provided with a bottom end support mechanism, the upper surface of the Bailey beam is provided with a distribution beam, the upper surface of the distribution beam is provided with a full-frame support, and the upper surface of the full-frame support is provided with an upper formwork system; a long spiral cast-in-place pile foundation is used for supporting the Bailey beam, and the upper surface of the long spiral cast-in-place pile foundation is provided with a bearing platform. The long spiral cast-in-place pile foundation and the bottom end support mechanism are adopted to form a rigid foundation, the single-pile compressive bearing capacity is greater than the maximum support reaction force, the adverse geological characteristics of deep soft soil can be effectively coped with, the bearing platform is anchored with the cast-in-place pile through reserved steel bars, and the top elevation is strictly controlled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge engineering, in particular to a cast-in-situ beam construction support structure for deep soft soil area. BACKGROUND

[0002] In the field of bridge engineering construction, cast-in-situ beam construction is a common form of superstructure construction, and the full-frame support used is the most widely used support method at present. The quality of foundation treatment before the erection of the support directly affects the construction safety and efficiency. For foundations with good geological conditions, ground hardening is a simple and efficient conventional treatment method.

[0003] However, in areas with poor geological conditions, especially in deep soft soil areas, foundation treatment faces many challenges. The commonly used treatment methods include dredging and replacement, enlarged concrete foundation, cement mixing pile, and pipe pile foundation, but these methods have obvious limitations: dredging and replacement may cause uneven settlement of the foundation due to uneven replacement of the replacement material or insufficient compaction; although the enlarged concrete foundation can disperse the load, it has poor overall stability in deep soft soil, and the large amount of material used leads to high cost; the strength of the cement mixing pile is significantly affected by the uniformity of the geology, and the pile body strength is prone to differences, which may cause uneven settlement; the construction cost of the pipe pile foundation is relatively high, and its applicability is limited in areas where there is deep clear water or equipment access is difficult.

[0004] These problems not only affect the construction efficiency and the quality of the cast-in-situ beam, but also may increase the safety risk due to foundation instability, so a cast-in-situ beam construction support structure suitable for deep soft soil areas is needed to solve the problems of settlement control, cost control, and adaptability to complex working conditions in foundation treatment. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a cast-in-situ beam construction support structure for deep soft soil area, which solves the problem of "the prior art in the area with poor geological conditions, the foundation treatment faces many challenges, and a cast-in-situ beam construction support structure suitable for deep soft soil area is needed".

[0006] To achieve the above purpose, the present application is implemented by the following technical scheme: a cast-in-situ beam construction support structure for deep soft soil area, comprising:

[0007] a permanent structure pier column for supporting the overall device, a beret beam is installed on the upper surface of the permanent structure pier column, a support is installed on the lower surface of the beret beam, a bottom end support mechanism is installed on the lower surface of the support, a distribution beam is installed on the upper surface of the beret beam, a full-frame support is installed on the upper surface of the distribution beam, and an upper formwork system is installed on the upper surface of the full-frame support;

[0008] The long spiral cast-in-place pile foundation is used for supporting the bailey beam, and the upper surface of the long spiral cast-in-place pile foundation is provided with a bearing platform, and the bearing platform is installed on the lower surface of the bailey beam.

[0009] Preferably, the support member includes, but is not limited to, an I-shaped steel.

[0010] Preferably, the outer wall of the permanent structure pier column is provided with a climbing cone corbel, the upper surface of the climbing cone corbel is provided with a main beam, and the main beam is installed on the lower surface of the bailey beam.

[0011] Preferably, the long spiral cast-in-place pile foundation and the bottom end support mechanism are uniformly arranged in the longitudinal direction of the bridge, and the number of arrangements in the transverse direction is determined according to the width of the support and the load borne.

[0012] Preferably, the top of the bearing platform is filled with high-strength grouting material, and the bailey beam and the distribution beam are connected through a horse bolt.

[0013] Preferably, the bottom end support mechanism further comprises an inner support rod, the inner support rod is fixedly connected to the lower surface of the support member, the inner wall of the inner support rod is provided with a displacement sensor, and the measurable parameters of the displacement sensor include, but are not limited to, an inclination angle.

[0014] Preferably, the full-frame support is provided with an adjustable base and a support at the lower part, and the adjustable base and the support of the full-frame support are arranged in the middle of the contact position with the distribution beam.

[0015] Preferably, the inner wall of the inner support rod is slidably connected with a protrusion, the protrusion is provided in multiple groups, and the multiple groups of the protrusion are arranged in a rotating array with the center line of the inner support rod as the rotating axis.

[0016] Preferably, the outer wall of the inner support rod penetrates and is slidably connected with an adjusting sleeve, the inner wall of the adjusting sleeve is fixedly connected with an extrusion rod, the inner wall of the inner support rod is fixedly connected with a sheath, the extrusion rod is slidably connected to the inner wall of the sheath, and the lower surface of the extrusion rod is drivingly connected with the protrusion through a hinged rod.

[0017] Preferably, the outer wall of the inner support rod is sleeved with a sliding plate, the upper surface of the sliding plate is fixedly connected with an extrusion block, the outer wall of the adjusting sleeve is fixedly connected with a support plate near the bottom end position, and the inner wall of the support plate is slidably connected with a locking block.

[0018] The application provides a cast-in-place beam construction support structure for deep and thick soft soil area.

[0019] 1. The present application adopts long spiral cast-in-place pile foundation and bottom end support mechanism to form rigid foundation, the single pile compressive bearing capacity is greater than the maximum support reaction force, which can effectively deal with the adverse geological characteristics of deep soft soil, the pile cap is anchored with the cast-in-place pile through reserved steel bars, the top elevation is strictly controlled, the upper load can be uniformly transmitted to the pile foundation, the uneven settlement of the foundation is greatly reduced, and the stability of the overall structure is ensured.

[0020] 2. The present application does not need complex pre-treatment process through long spiral cast-in-place pile construction, the equipment operation is convenient and flexible, is less affected by the conditions after preliminary site arrangement, each equipment can stably construct 8-10 roots per day, can complete large area foundation construction in a short time, is not easily disturbed by bad weather, can continuously work, and can effectively deal with the complex construction environment such as accumulated water and muddy soil in deep soft soil area, can significantly shorten the overall construction period, and ensure that the engineering progress advances according to the plan.

[0021] 3. The present application can drive the adjusting sleeve to move downward through the moving support plate, so as to drive the extrusion rod in the adjusting sleeve to push the hinged rod to rotate, the hinged rod rotates to push the protrusion to move outward, so as to drive the protrusion to insert into the soft soil area, which can further enhance the contact area of the inner support rod and the soft soil area, thereby achieving the effect of further improving the stability.

[0022] 4. The present application sets the inner support rod as hollow, when the protrusion extends outward, the through groove below the protrusion will be exposed, so as to inject the filler into the inner support rod, the filler will flow out from below the inner support rod through the through groove, so as to directly fill the gap between the inner support rod and the soft soil area from below, the overall device is convenient to fill. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a front view of the present application;

[0024] Figure 2 It is a side view of the long spiral cast-in-place pile foundation support of the present application;

[0025] Figure 3 It is a side view of the bottom end support mechanism support of the present application;

[0026] Figure 4 It is an elevation view of the long spiral cast-in-place pile and the pile cap of the present application;

[0027] Figure 5 It is an elevation view and a side view of the 6-hole bracket of the present application;

[0028] Figure 6 It is an elevation view and a side view of the 4-hole bracket of the present application;

[0029] Figure 7The 6-hole bracket and the 4-hole bracket are top views of the present application;

[0030] Figure 8 The figure is a schematic view of the three-dimensional structure of the bottom end support mechanism of the present application;

[0031] Figure 9 The figure is a schematic view of the three-dimensional structure of the bottom end support mechanism of the present application.

[0032] Wherein, 1, long spiral cast-in-place pile foundation; 2, bottom end support mechanism; 21, inner support rod; 22, adjusting sleeve; 23, support plate; 24, locking block; 25, sliding plate; 26, protruding block; 27, extrusion block; 28, extrusion rod; 29, sheath; 210, hinged rod; 211, through slot; 3, bearing platform; 4, climbing cone bracket; 5, main beam; 6, support; 7, Bailey beam; 8, distribution beam; 9, full support; 10, upper formwork system; 11, permanent structure pier column; 12, high-strength grouting material. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the specification of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Embodiment one:

[0034] Please refer to the drawings in the specification of the present application Figure 1 The drawings in the specification of the present application Figure 9 The embodiment of the present application provides a cast-in-place beam construction support structure in deep soft soil area, which comprises:

[0035] The permanent structure pier column 11 is the core load-bearing structure of the bridge, and its strength is strictly calculated to bear all the loads of the upper part, and is used to support the overall device. The upper surface of the permanent structure pier column 11 is provided with the Bailey beam 7, which is fixedly connected with the permanent structure pier column 11 through bolts and other connecting members. The lower surface of the Bailey beam 7 is provided with the support 6, which plays a role of connecting the Bailey beam 7 and the bottom end support mechanism 2. The lower surface of the support 6 is provided with the bottom end support mechanism 2, which penetrates into the soft soil layer to provide vertical support for the upper structure. The upper surface of the Bailey beam 7 is provided with the distribution beam 8, which disperses and transmits the load borne by the Bailey beam 7 to the full support 9. The upper surface of the distribution beam 8 is provided with the full support 9, which further disperses the load through dense vertical rods. The upper surface of the full support 9 is provided with the upper formwork system 10. The upper formwork system 10 directly determines the forming size and appearance quality of the cast-in-place beam.

[0036] The long spiral cast-in-place pile foundation 1 is formed by long spiral drilling technology, which can penetrate into the soft soil layer to provide stable support and is used to support Bailey beam 7. A pile cap 3 is installed on the upper surface of the long spiral cast-in-place pile foundation 1. The pile cap 3 and the long spiral cast-in-place pile foundation 1 are anchored with steel bars to form an integral load-bearing structure. The pile cap 3 is installed on the lower surface of Bailey beam 7 and the pile cap 3 evenly transfers the load of Bailey beam 7 to the long spiral cast-in-place pile foundation 1.

[0037] Reference Figure 1 - Figure 3 The connection between the support member 6 and the bottom support mechanism 2 includes, but is not limited to, direct fixing with bolts. Bolt connection is convenient to install and easy to adjust. The support member 6 includes, but is not limited to, I-beams, crossbeams, and slide rails. Crossbeams are more suitable for fixed load-bearing scenarios, while slide rails are more convenient for fine-tuning the installation position. The outer wall of the permanent structural pier 11 is equipped with a climbing cone bracket 4. The climbing cone bracket 4 is connected to the permanent structural pier 11 through pre-embedded climbing cones to ensure strength. The upper surface of the climbing cone bracket 4 is equipped with a main beam 5. The connection surface between the main beam 5 and the climbing cone bracket 4 is leveled to ensure uniform stress. The main beam 5 is installed on the lower surface of the Bailey beam 7. The main beam 5 provides additional support points for the Bailey beam 7 to enhance the overall rigidity. The long spiral cast-in-place pile foundation 1 and the bottom support mechanism 2 are evenly arranged along the longitudinal direction of the bridge. The even arrangement in the longitudinal direction can make the load evenly distributed along the length of the bridge. The number of piles arranged in the transverse direction is determined according to the width of the support and the load. The number of piles in the transverse direction is determined by mechanical calculation to meet the stress requirements.

[0038] Reference Figure 1 - Figure 3 The unsupported portion of the top cantilever of the foundation 3 is filled with high-strength grout 12. High-strength grout 12 has the characteristics of high strength and no shrinkage, which can ensure dense filling. Bailey beam 7 and distribution beam 8 are connected by saddle bolts. Saddle bolts can enhance the integrity of the two and prevent relative slippage. The lower part of the full-span support 9 is equipped with an adjustable base and support. The adjustable base and support can flexibly adjust the height to adapt to foundation settlement. The contact position of the adjustable base and support of the full-span support 9 with the distribution beam 8 is centered. The centered contact can avoid uneven load distribution and ensure uniform load transfer.

[0039] Reference Figure 3 , Figure 8 and Figure 9The bottom end support mechanism 2 further comprises an inner support rod 21, which is a core load-bearing component of the bottom end support mechanism and is made of high-strength steel to ensure its load-bearing capacity. The inner support rod 21 is fixedly connected to the lower surface of the support piece 6, and the fixed connection between the two is achieved by welding or bolts. In this way, the load borne by the support piece 6 can be effectively transmitted to the inner support rod 21. A displacement sensor is installed on the inner wall of the inner support rod 21, which can monitor the dynamic changes of the inner support rod 21 in real time. The displacement sensor can measure parameters including but not limited to the inclination angle. By measuring the inclination angle, it can be found in time whether the inner support rod 21 is deflected, providing data reference for structural stability. A plurality of protrusions 26 are slidingly connected to the inner wall of the inner support rod 21. The plurality of protrusions 26 can enhance the engagement force of the inner support rod 21 with the soft soil from multiple directions. The plurality of protrusions 26 are arranged in a rotational array with the center line of the inner support rod 21 as the rotation axis. This array arrangement makes the protrusions 26 bear force evenly, avoiding structural damage caused by excessive local force.

[0040] With reference to Figure 3 , Figure 8 and Figure 9 , the lower surface of the extrusion rod 28 is drivingly connected to the protrusions 26 through the hinged rod 210. The outer wall of the inner support rod 21 is sleeved with a sliding plate 25. The upper surface of the sliding plate 25 is fixedly connected with an extrusion block 27. The upper surface of the extrusion block 27 is designed as an arc. The outer wall of the adjusting sleeve 22 is fixedly connected with a support plate 23 near the bottom end. When the adjusting sleeve 22 moves downward, the support plate 23 also moves downward synchronously. The inner wall of the support plate 23 is slidingly connected with a locking block 24. The end of the locking block 24 close to the inner support rod 21 is provided with anti-slip patterns, which can enhance the locking effect. When the support plate 23 moves downward, it will drive the locking block 24 to move downward synchronously. When the locking block 24 contacts the extrusion block 27, the locking block 24 will be forced to move inward to extrude the inner support rod 21. In this way, the locking block 24 will not be able to continue to move downward, and at the same time, the support plate 23 and the adjusting sleeve 22 will be forced to stop moving. The position of the adjusting sleeve 22 can be fixed by sliding the locking block 24.

[0041] Construction method: before installing the whole device, first need to carry out foundation construction, for long spiral cast-in-place pile foundation 1, before construction need to clean and level the site with excavator, fill with appropriate thickness of slag, cinder and other materials to meet the long spiral pile machine construction needs, need to control the hole deviation not more than the specification allowed value, use the post-insertion method to insert the reinforcement cage into the pile foundation concrete of the predetermined depth through the vibration rod, ensure that the pile foundation concrete grade meets the single pile vertical force strength requirement, for the bottom support mechanism 2, before construction review the pile coordinate and central deviation, adjust the plane position and perpendicularity, rely on the weight of the bottom support mechanism 2 and the vibration hammer to press the hammer into the soil, after confirming the stability of the pile body into the soil to a certain depth and re-measuring the pile position and inclination, start the vibration hammer for vibration sinking construction, the pile sinking operation is completed at one time, the lengthening welding uses equal length ring welding, the weld excess height is not less than 2mm, the butt joint misalignment size is not more than 3mm, and the outer package is strengthened by welding the peripheral angle weld to strengthen, need to clean the impurities in the weld range in time to ensure the welding quality during outdoor operation.

[0042] When the bottom support mechanism 2 is fixed, the inner support rod 21 needs to be fixed at the support position first, then the downward moving adjusting sleeve 22 drives the extrusion rod 28 to move downward, the downward movement of the extrusion rod 28 will extrude the hinged rod 210 to force it to rotate outward, so as to drive the lug 26 to move outward and expand, so as to further increase the stability of the connection between the inner support rod 21 and the land by means of the lug 26, then the inner support rod 21 can be injected with the filling material, the filling material can flow into the connection between the inner support rod 21 and the land through the through slot 211, so as to realize the long-term fixation of the inner support rod 21.

[0043] After the foundation construction is completed, the pile cap 3 is constructed on the top of the long spiral cast-in-place pile foundation 1, the reserved steel bars of the long spiral cast-in-place pile foundation 1 are anchored into the pile cap 3, the top elevation of each row of pile caps 3 is strictly controlled, anchor steel bars are added on the top of the pile cap 3, steel bars are arranged inside, and high-strength grouting material 12 is used to fill the unimplemented part to be dense. At the same time, the climbing cone corbel 4 is pre-buried when the permanent structure pier column 11 is constructed, the number and type of the climbing cone are determined according to the load, the climbing cone corbel 4 is installed after the concrete strength of the permanent structure pier column 11 reaches the requirement, to ensure that the top surface is horizontal and the bolt fastening force meets the design specification.

[0044] Then the load-bearing structure is installed, the double-spliced main beam 5 is installed on the climbing cone bracket 4, the bearing platform 3 and the bottom end supporting mechanism 2, the length of the main beam 5 is determined according to the width of the box girder, the material needs to be free of cracks, depressions and rust, if it needs to be lengthened, the joint is arranged according to equal strength, the profile steel web and the upper and lower flange plates are connected by groove butt welding, after completion, the welding quality is ensured by welding around the splicing plates on both sides of the web, the planar position and elevation of the climbing cone bracket 4, the bearing platform 3 and the top of the bottom end supporting mechanism 2 are re-measured before installation, to ensure that the main beam 5 closely fits the top surface of the pedestal, and the anchoring steel is welded and limited in position after being in place. Then the Bailey beam 7 is installed, the riding bolt is used for reinforcement at the connection between the Bailey beam 7 and the distribution beam 8, the full-frame support 9 is installed on the distribution beam 8, to ensure that the adjustable base and the support of the full-frame support 9 are centered at the contact position of the distribution beam 8, and the support gap caused by the transverse slope of the beam body is filled with wedge pieces.

[0045] Then the upper formwork system 10 is installed, the splicing is arranged to ensure that the upper formwork system 10 is horizontal and vertical. Finally, the cast-in-place support is pre-pressed, the support is checked and accepted according to the design drawings and standard specifications before pre-pressing, the load is symmetrical and balanced during pre-pressing, local overload or overall partial load is strictly prohibited, the load weight and stacking condition are checked and reviewed, to ensure that the load weight of each stage meets the requirements, the grading loading time is strictly controlled according to the grading loading stability standard, the unloading time is controlled according to the pre-pressing qualification judgment standard, the settlement observation point marking is ensured to be firm and not to slip, the observation point marking is not damaged during the loading process, the pre-camber is set according to the elastic deformation value after pre-pressing, to ensure that the beam body meets the design linear requirements after the concrete is poured.

[0046] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction support structure for cast-in-situ beam construction in deep soft soil areas, characterized in that, The utility model relates to a kind of bridge construction support structure, including: Permanent structure pier column (11) for supporting overall device, the upper surface of the permanent structure pier column (11) is installed with bailey beam (7), the lower surface of bailey beam (7) is installed with support piece (6), the lower surface of support piece (6) is installed with bottom end support mechanism (2), the upper surface of bailey beam (7) is installed with distribution beam (8), the upper surface of distribution beam (8) is installed with full-tower support (9), the upper surface of full-tower support (9) is installed with upper formwork system (10); Long spiral bored pile foundation (1) for supporting bailey beam (7), the upper surface of the long spiral bored pile foundation (1) is installed with bearing platform (3), and the bearing platform (3) is installed on the lower surface of bailey beam (7); The bottom end support mechanism (2) further includes an inner support rod (21), the inner wall of the inner support rod (21) is slidably connected with a protrusion (26), the outer wall of the inner support rod (21) is penetrated and slidably connected with an adjusting sleeve (22), the inner wall of the adjusting sleeve (22) is fixedly connected with an extrusion rod (28), the inner wall of the inner support rod (21) is fixedly connected with a sheath (29), the extrusion rod (28) is slidably connected to the inner wall of the sheath (29), the lower surface of the extrusion rod (28) is drivingly connected with the protrusion (26) through a hinge rod (210), the outer wall of the inner support rod (21) is sleeved with a sliding plate (25), the upper surface of the sliding plate (25) is fixedly connected with an extrusion block (27), the outer wall of the adjusting sleeve (22) is fixedly connected with a support plate (23) near the bottom end position, and the inner wall of the support plate (23) is slidably connected with a locking block (24).

2. The construction support structure for cast-in-place beam in deep soft soil area according to claim 1, characterized in that, The support piece (6) includes, but is not limited to, an I-beam.

3. The construction support structure for cast-in-place beam in deep soft soil area according to claim 1, characterized in that, The outer wall of the permanent structure pier column (11) is installed with a climbing cone corbel (4), and the upper surface of the climbing cone corbel (4) is installed with a main beam (5), and the main beam (5) is installed on the lower surface of the bailey beam (7).

4. The construction support structure for cast-in-place beam in deep soft soil area according to claim 1, characterized in that, The long spiral bored pile foundation (1) and the bottom end support mechanism (2) are evenly arranged in the longitudinal direction of the bridge, and the number of arrangements in the transverse direction is determined according to the width of the support and the load borne.

5. The construction support structure for cast-in-place beam in deep soft soil area according to claim 1, characterized in that, The top of the bearing platform (3) is filled with high-strength grouting material (12), and the bailey beam (7) and the distribution beam (8) are connected by a stud bolt.

6. The construction support structure for cast-in-place beam in deep soft soil area according to claim 4, characterized in that, The inner support rod (21) is fixedly connected to the lower surface of the support piece (6), and a displacement sensor is installed on the inner wall of the inner support rod (21), and the measurable parameters of the displacement sensor include, but are not limited to, an inclination angle.

7. The construction support structure for cast-in-place beam in deep soft soil area according to claim 1, characterized in that, The adjustable base and brace are arranged at the lower part of the full-tower support (9), and the adjustable base and brace of the full-tower support (9) are centered at the contact position with the distribution beam (8).

8. The construction support structure for cast-in-place beam in deep soft soil area according to claim 6, characterized in that, The protrusions (26) are arranged in multiple groups, and the multiple groups of protrusions (26) are rotationally arranged around the center line of the inner support rod (21) as the rotation axis.

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