A construction method and device for reinforcing a construction joint of an ultra-thick base plate

Abstract

The application discloses a kind of super-thick bottom plate construction joint reinforcing construction method and device, belong to civil engineering technical field.The method includes: in super-thick bottom plate construction joint, steel edge rubber waterstop is set lengthways;Rigid framework is formed using channel steel, and transverse tie is laid along the length direction of construction joint Equidistantly;Preparation comb-tooth comb plate is cut and shaped template, and is inserted between joint area reinforcement to form regular bonding surface;Along the horizontal direction perpendicular to the surface of construction joint, round steel is configured to complete bidirectional tie against bolt;Along the oblique setting of acute angle with horizontal plane, inclined roof support is arranged, and through oblique support reaction force, from lateral constraint keel displacement;Waterstop structure is synchronously installed with reinforcing framework, and full-face constraint is carried out to construction joint.The application realizes super-thick bottom plate construction joint waterstop, reinforcing, crack resistance integrated construction, and significantly improves the impermeability of construction joint, structural integrity and durability.

Description

Technical Field

[0001] This invention belongs to the field of civil engineering technology, specifically relating to a construction method and device for reinforcing construction joints in ultra-thick foundation slabs. Background Technology

[0002] The ultra-thick base slab has a large thickness and concentrated lateral pressure on the concrete. The construction joint is weak and difficult to waterproof. Conventional methods such as waterstop steel plates, waterstop strips, and sealing mesh are not suitable for the stress and waterproofing requirements of ultra-thick sections. Problems often occur such as poor interface bonding, formation of seepage channels, misalignment of waterstop components, and insufficient compaction. Conventional construction joint treatment uses a single-layer waterstop structure, simple steel bar positioning, and subsequent roughening. This has defects such as poor overall integrity, insufficient impermeability, low positioning accuracy, complex procedures, uncontrollable forming quality, and great difficulty in subsequent leakage repair. Summary of the Invention

[0003] This invention aims to provide a construction method and device for reinforcing construction joints in ultra-thick base slabs. It adopts an integrated structure for water-stopping and reinforcement, realizing integrated construction of water-stopping, reinforcement, and crack resistance for construction joints in ultra-thick base slabs.

[0004] Preferably, a steel-edged rubber waterstop is installed along the entire length of the construction joint of the ultra-thick base plate. The waterstop is centrally located and welded to the reinforcing steel reinforcement. The overlapping parts are fully welded and sealed, thereby forming a continuous and closed waterstop in the middle of the construction joint, extending the seepage path and blocking the seepage channel.

[0005] Preferably, a rigid skeleton is formed by channel steel, and reinforcing bars are arranged along the length between the upper and lower layers of reinforcing bars in the construction joint. Transverse tie bars are arranged at equal intervals along the length of the construction joint to form a steel skeleton reinforcement system. This creates a continuous horizontal constraint in the longitudinal direction of the construction joint, improves the overall stiffness and deformation resistance of the construction joint, and prevents concrete shrinkage cracking.

[0006] Preferably, based on the arrangement of multiple layers of dense steel bars at the construction joint, a comb-shaped template is cut and prepared to make a comb-shaped board. The gap between the comb teeth of the board matches the outer diameter and arrangement spacing of the corresponding steel bars. The comb board is then inserted between the steel bars in the joint area to form a regular joint surface. This ensures that the template and steel bars are precisely matched, while forming a regular concave-convex interface, increasing the bonding area between the old and new concrete and blocking direct seepage channels.

[0007] Preferably, steel pipes are used as the main keel and square timber as the secondary keel to form the template back rib system. Round steel tie bolts are arranged in the horizontal direction perpendicular to the construction joint surface to complete the bidirectional connection. One end of the round steel tie bolt passes through the steel pipe of the main keel on the outside of the connection, and the other end is fully welded to the channel steel reinforcement skeleton of the bottom plate. The horizontal tie force realizes the rigid reinforcement of the template and the existing reinforcement skeleton, thereby forming the template system, reinforcement skeleton and water-stop structure into an integrated load-bearing whole, avoiding the template from deviating, sinking or deforming in the direction perpendicular to the construction joint surface during the pouring process.

[0008] Preferably, an inclined top bracing reinforcement system is added to the outside of the rigid frame. The inclined top bracing is formed by steel pipes and adjustable U-shaped brackets. The inclined top bracing is set at an acute angle to the horizontal plane. The keel displacement is constrained from the side by the reaction force of the inclined top bracing. The two ends of the inclined top bracing are respectively pressed against the keel and the lower hardened base surface, thereby providing additional constraints from the side. It forms an orthogonal synergy with the horizontal tension force, improving the overturning resistance and overall structural rigidity of the construction joint frame.

[0009] Preferably, the water-stopping structure and the reinforcement frame are installed simultaneously to constrain the construction joint across the entire cross section, thereby ensuring that the spatial positions of the water-stopping structure and the reinforcement system are precisely aligned, achieving a synergistic effect of water-stopping, reinforcement, and crack resistance.

[0010] This invention, through the synergistic configuration of a water-stopping structure and a rigid frame reinforcement system, has the following advantages and characteristics: 1. The waterstop is placed in the center of the construction joint and welded to the reinforcing steel frame to form a continuous and closed waterstop line, thereby extending the seepage path and blocking the seepage channel. 2. The transverse tie bars arranged along the length of the construction joint and the tie bolts arranged perpendicular to the construction joint surface form an orthogonal horizontal constraint, thereby constructing a two-way force network in the plane of the construction joint and improving the overall stability of the skeleton. 3. The precise fit between the comb-shaped plate and the dense reinforcement creates a regular concave-convex joint surface between the formwork and the reinforcement, thereby increasing the bonding area between the new and old concrete and blocking the direct seepage channels. 4. The round steel tie bolts rigidly connect the template back rib system with the channel steel reinforcement skeleton, so that the template, reinforcement and water-stop structure form an integrated whole for bearing the load, thereby avoiding the template from deviating, sinking or deforming in the direction perpendicular to the construction joint during the pouring process. 5. The diagonal top bracing reinforcement system constrains the displacement of the keel from the side and forms a three-dimensional force synergy with the horizontal tie force, thereby improving the overturning resistance and overall structural stiffness of the construction joint skeleton. 6. The simultaneous installation of the water-stopping structure and the reinforcement frame, along with the full-section constraint, enables the construction joint to achieve a synergistic effect in terms of water-stopping, reinforcement, and crack resistance, thereby significantly improving the impermeability, structural integrity, and durability of the construction joint in the ultra-thick base slab. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the reinforcement bars in the base plate of the present invention.

[0012] Figure 2 This is a schematic diagram of the construction joint template for the base plate of the present invention.

[0013] Figure 3 This is a schematic diagram of the construction joint side formwork of the present invention.

[0014] Figure 4 This is a schematic diagram of the construction joint template for the base plate of the present invention. Detailed Implementation

[0015] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0016] Example 1

[0017] This embodiment provides a construction method and device for reinforcing construction joints in ultra-thick slabs, which is applicable to the treatment of construction joints in large-volume, ultra-thick concrete slabs.

[0018] like Figure 1 As shown, the bottom slab reinforcement includes upper layer reinforcement, middle layer reinforcement and lower layer reinforcement. The reinforcement of each layer is arranged according to the design spacing to provide stable support for the construction joint reinforcement system.

[0019] like Figure 2 As shown, a water-stop material 5 is installed along the entire length of the construction joint of the ultra-thick base slab. The water-stop material 5 is a steel-edged rubber water-stop strip, which is arranged centrally along the construction joint and welded and fixed to the reinforcing steel frame. The overlapping parts are fully welded and sealed to form a continuous and closed water-stop defense line. The formwork 1 is set on both sides of the construction joint to form a concrete forming space.

[0020] like Figure 3 As shown, the reinforcement system in this embodiment includes template 1, timber 2, round steel bolts 3, steel pipe 4, waterstop material 5, adjustable U-shaped support 6, steel pipe 7, grouting template 8, and channel steel 9.

[0021] The steel reinforcement system uses channel steel 9 to form a rigid framework, with channel steel 9 being No. 5 channel steel. Reinforcing bars are arranged along the entire length between the upper and lower layers of steel reinforcement at the construction joint, and transverse tie bars are evenly spaced along the length of the construction joint to improve the overall stiffness and integrity of the construction joint.

[0022] The interface impermeable structure uses a standardized comb-shaped template. Based on the arrangement of multiple layers of dense reinforcement at the construction joint of the ultra-thick base slab, the standardized template is cut to prepare the comb-shaped template. For example... Figure 4As shown, the comb plate includes a comb plate a for the upper row of reinforcing bars, a comb plate c for the middle row of reinforcing bars, and a comb plate d for the lower row of reinforcing bars, corresponding to the arrangement positions of the upper, middle, and lower rows of reinforcing bars, respectively. The gap between the comb teeth of the comb plate matches the outer diameter and arrangement spacing of the reinforcing bars at the corresponding positions, allowing the comb plate to be inserted and fitted between the reinforcing bars in the joint area, achieving a precise fit between the formwork and the reinforcing bars. Wood plywood b for the lower row of reinforcing bars and wood plywood e for the lower row of reinforcing bars are respectively placed on the outer side of the corresponding comb plate, forming a flat formwork surface.

[0023] The formwork reinforcement system uses steel pipe 4 as the main keel and timber 2 as the secondary keel to form the formwork back rib system. Round steel bolts 3 are installed along the horizontal direction perpendicular to the construction joint surface as round steel tie bolts to complete the bidirectional connection. One end of the round steel bolt 3 passes through the outer main keel steel pipe 4 for connection, and the other end is fully welded to the channel steel 9 reinforcement cage of the base plate. The horizontal tie force achieves rigid reinforcement between the formwork 1 and the existing reinforcement cage.

[0024] A diagonal top bracing reinforcement system is added to the outside of the rigid frame. Steel pipes (7) are paired with adjustable U-shaped supports (6) to form the diagonal top bracing, which is installed at an acute angle to the horizontal plane. The diagonal top bracing is arranged vertically at 1.0m intervals and horizontally at 1.5m intervals. The two ends of the diagonal top bracing are respectively pressed against the keel and the lower hardened base surface. The reaction force of the diagonal bracing laterally restrains the displacement of the keel, improving the overturning resistance and overall structural rigidity of the construction joint frame.

[0025] Grouting template 8 is set at the bottom of the construction joint to prevent grout leakage and ensure the forming quality of the bottom of the construction joint.

[0026] The construction steps are as follows: Step 1: Technical Review. Review the thickness of the ultra-thick base plate, the location, length, and elevation of the construction joint, draw detailed construction drawings of the construction joint, and clarify the dimensions of the water-stopping, reinforcement, and anti-seepage structures.

[0027] Step 2: Measurement and layout. Mark the center line, edge line, rebar positioning line, and elevation control line of the construction joint on the base slab, ensuring that the construction joint is straight and accurately positioned.

[0028] Step 3: Binding the lower layer of reinforcement in the base slab. Bind the lower layer of reinforcement in the base slab according to the design drawings, ensuring uniform spacing, row spacing, and protective layer thickness of the reinforcement bars to provide stable support for the construction joint reinforcement system.

[0029] Step 4: Installation of the water-stopping system. The water-stopping material 5 is installed along the entire length of the construction joint, centered, and fixed with positioning clamps to ensure consistent elevation, no deviation, and no sinking. The overlapping parts are fully welded and sealed.

[0030] Step 5: Installation of the rigid framework for the construction joint. A rigid framework for the construction joint is constructed using a comb-type splicing template combined with a steel pipe composite keel assembly system. Based on the arrangement of multiple layers of dense reinforcement at the construction joint of the ultra-thick base slab, a comb-shaped template is cut and prepared. The gaps between the comb teeth of the template match the outer diameter and spacing of the corresponding reinforcement bars, allowing the template to be inserted and clamped between the reinforcement bars in the joint area. Steel pipe 4 is selected as the main keel, and timber 2 as the secondary keel to form the template back rib system. Round steel bolts 3 are arranged in a horizontal direction perpendicular to the construction joint surface to complete the bidirectional connection. One end of the round steel bolt 3 passes through the outer main keel steel pipe 4 for connection, and the other end is fully welded to the channel steel 9 reinforcement skeleton of the base slab. The horizontal connection force achieves rigid reinforcement between the template 1 and the existing reinforcement skeleton. An inclined top bracing reinforcement system is added to the outside of the rigid frame. Steel pipe 7 is used in combination with adjustable U-shaped brackets 6 to form an inclined top bracing. The inclined top bracing is set at an acute angle to the horizontal plane. The inclined top bracing is arranged at a spacing of 1.0m vertically and 1.5m horizontally. The two ends of the inclined top bracing are respectively pressed against the keel and the lower hardened base surface. The keel displacement is constrained laterally by the reaction force of the inclined bracing.

[0031] Step 6: Template Correction and Acceptance. Verify the location, elevation, verticality, and structural integrity of construction joints. Inspect the installation quality of the water-stopping, reinforcement, and anti-seepage systems. Concrete pouring can only proceed after the inspection and acceptance are passed.

[0032] Step 7: Concrete Pouring and Curing. Pour concrete on one side of the construction joint, vibrate to ensure compaction, and ensure the bonding surface is dense and free of voids; after pouring, cover and moisturize in a timely manner to ensure the forming quality of the ultra-thick base slab and construction joint.

[0033] Variation Example 1 The difference between this variation and Example 1 lies in the form of the waterstop structure. Waterstop material 5 can be replaced by a centrally embedded rubber waterstop or a steel-plate rubber composite waterstop instead of a steel-edged rubber waterstop. The waterstop is still centrally positioned along the entire length of the construction joint and welded to the reinforcing steel frame, with the lap joints fully welded shut. The remaining rigid frame, comb-plate formwork, and diagonal top bracing reinforcement system are the same as in Example 1, thus achieving a continuous waterstop barrier in the middle of the construction joint under different waterstop material forms, and maintaining three-dimensional stress coordination in the horizontal longitudinal, horizontal transverse, and diagonal directions.

[0034] Variation Example 2 The difference between this variant and Example 1 lies in the parameters of the inclined top bracing reinforcement system. The inclined top supports are arranged vertically at intervals of 0.8m-1.2m and horizontally at intervals of 1.2m-1.8m. The adjustment range of the adjustable U-shaped support 6 and the diameter of the steel pipe 7 are determined based on calculations of the lateral pressure of the ultra-thick base plate. The remaining water-stopping structure, rigid frame, and comb-shaped template are the same as in Example 1, thus achieving lateral constraint on keel displacement under different support parameters and forming a three-dimensional force synergy with the horizontal tension force.

[0035] Variation Example 3 The difference between this variant and Example 1 lies in the material of the comb plate. The comb plate can use aluminum alloy or steel prefabricated templates instead of wooden templates. The gaps between the comb teeth still match the outer diameter and spacing of the corresponding reinforcing bars, and it is clamped and inserted between the reinforcing bars in the joint area. Aluminum alloy or steel prefabricated templates have higher turnover rates and rigidity, making them suitable for multiple-cycle construction. The remaining water-stopping structure, rigid frame, and diagonal top bracing reinforcement system are the same as in Example 1, thus achieving precise matching between the template and reinforcing bars and forming a regular concave-convex joint surface, maintaining a three-dimensional stress-coordinated system even with different comb plate materials.

[0036] In this embodiment, the above-mentioned technical solution allows the water-stopping material 5 to be centrally positioned at the construction joint and welded and fixed to the reinforcing steel skeleton composed of channel steel 9, forming a continuous and closed water-stopping defense line, thereby extending the seepage path and blocking the seepage channel; the transverse tie bars arranged along the length of the construction joint and the round steel bolts 3 arranged perpendicular to the construction joint surface form an orthogonal horizontal constraint, thereby constructing a two-way force network in the plane of the construction joint and improving the overall stability of the skeleton; the precise fit between the comb-shaped comb plate and the multi-layer dense steel reinforcement forms a regular concave-convex interface on the concrete bonding surface, thereby increasing the bonding area between the old and new concrete and blocking the direct seepage channel; the round steel bolts 3 connect the template back rib system with... The rigid connection of the channel steel 9 steel reinforcement skeleton makes the formwork 1, steel reinforcement and water-stop material 5 an integrated whole for bearing force, thereby avoiding the formwork from deviating, sinking or deforming in the direction perpendicular to the construction joint surface during the pouring process; the inclined top support reinforcement system composed of steel pipe 7 and adjustable U-shaped support 6 is set along the inclined direction, which restricts the displacement of the keel from the side and forms a three-dimensional force synergy with the horizontal tension force, thereby improving the overturning performance and overall structural rigidity of the construction joint skeleton; the synchronous installation of the water-stop structure and the reinforcement skeleton and the full-section constraint make the construction joint form a synergistic effect in terms of water-stopping, reinforcement and crack resistance, thereby significantly improving the impermeability, structural integrity and durability of the construction joint of the ultra-thick bottom plate.

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A construction method for reinforcing construction joints in ultra-thick base slabs, characterized in that, Includes the following steps: A steel-edged rubber waterstop is installed along the entire length of the construction joint of the ultra-thick base plate. The waterstop is centrally positioned and welded to the reinforcing steel reinforcement. The lap joint is fully welded and sealed. A rigid skeleton is formed by using channel steel, with reinforcing bars arranged along the entire length between the upper and lower layers of steel bars in the construction joint, and transverse tie bars are arranged at equal intervals along the length of the construction joint to form a steel skeleton reinforcement system. Based on the arrangement of multiple layers of dense steel bars at the construction joint, a comb-shaped plate is prepared by cutting a template. The gap between the teeth of the comb plate matches the outer diameter and arrangement spacing of the corresponding steel bars. The comb plate is then inserted between the steel bars in the joint area to form a regular joint surface. Steel pipes are selected as the main keel and square timber as the secondary keel to form a template back rib system. Round steel tie bolts are arranged in a horizontal direction perpendicular to the construction joint surface to complete the bidirectional tie. One end of the round steel tie bolt passes through the steel pipe of the main keel on the outside of the tie, and the other end is fully welded to the channel steel reinforcement skeleton of the bottom plate. The rigid reinforcement of the template and the existing steel reinforcement skeleton is achieved by the horizontal tie force. An inclined top bracing reinforcement system is added to the outside of the rigid frame. The inclined top bracing is formed by steel pipes and adjustable U-shaped brackets. The inclined top bracing is set at an acute angle to the horizontal plane. The keel displacement is constrained from the side by the reaction force of the inclined top bracing. The two ends of the inclined top bracing are respectively pressed against the keel and the lower hardened base surface. The water-stopping structure and the reinforcement frame are installed simultaneously, and the construction joint is constrained across the entire cross section, thus completing the integrated construction of water-stopping, reinforcement and crack resistance for the construction joint of the ultra-thick base plate.

2. A construction device for reinforcing construction joints in ultra-thick base slabs, characterized in that, include: The water-stopping structure includes a steel-edged rubber waterstop strip arranged centrally along the entire length of the construction joint. The waterstop strip is welded and fixed to the reinforcing steel frame, and the lap joint is fully welded and sealed. The steel reinforcement system includes a rigid frame made of channel steel, reinforcing bars arranged along the length of the construction joint between the upper and lower layers of steel bars, and transverse tie bars arranged at equal intervals along the length of the construction joint. The interface impermeable structure includes a comb-shaped comb plate prepared by cutting a template according to the position of the multi-layer dense steel reinforcement at the construction joint. The gap of the comb plate matches the outer diameter and the spacing of the steel reinforcement at the corresponding position, and is clamped and inserted between the steel reinforcement in the joint area to form a regular joint surface. The template reinforcement system includes steel pipes as main keels and arranged in a direction perpendicular to the construction joint surface, square timbers as secondary keels, and round steel tie bolts arranged in a horizontal direction perpendicular to the construction joint surface. One end of the round steel tie bolt is inserted through the outer main keel steel pipe, and the other end is fully welded to the channel steel reinforcement skeleton of the base plate. The positioning and fixing device includes an inclined top support reinforcement system set on the outside of the rigid frame. The inclined top support reinforcement system includes a steel pipe and an adjustable U-shaped bracket set at an acute angle to the horizontal plane. The keel displacement is constrained from the side by the inclined support reaction force. The two ends of the inclined top support are respectively pressed against the keel and the lower hardened base surface.

3. The method or apparatus according to claim 1 or 2, characterized in that, The waterstop is fixed with positioning clamps to ensure consistent elevation, no deviation, and no sinking.

4. The method or apparatus according to claim 1 or 2, characterized in that, The comb plate includes an upper row of reinforcing bars comb plate, a middle row of reinforcing bars comb plate, and a lower row of reinforcing bars comb plate, which respectively correspond to the arrangement positions of the upper, middle, and lower rows of reinforcing bars at the construction joint.

5. The method or apparatus according to claim 1 or 2, characterized in that, The template back rib system also includes a grouting template, which is set at the bottom of the construction joint.

6. The method or apparatus according to claim 1 or 2, characterized in that, The inclined top supports are arranged vertically at 1.0m intervals and horizontally at 1.5m intervals.

7. The method or apparatus according to claim 1 or 2, characterized in that, The construction joint side formwork adopts a segmented assembly and reusable dismantling template structure.

8. The method or apparatus according to claim 1 or 2, characterized in that, The steel-edged rubber waterstop is installed in the middle of the construction joint, and the channel steel reinforcement skeleton is symmetrically arranged on both sides of the waterstop.

9. The method or apparatus according to claim 1 or 2, characterized in that, The regular joint surface forms a groove after the concrete is poured. After the formwork is removed, the surface is roughened to form a through-type anti-seepage groove.

10. The method or apparatus according to claim 1 or 2, characterized in that, The method is implemented according to the following steps: technical verification step, verifying the thickness of the extra-thick base plate, the location, length and elevation of the construction joint; measurement and layout step, laying out the center line, edge line, rebar positioning line and elevation control line of the construction joint on the base plate cushion layer; rebar binding step, binding the lower layer of rebar of the base plate according to the design drawings; waterstop installation step, setting the waterstop material along the entire length of the construction joint in the center and fixing it with positioning clamps; rigid frame installation step, building an assembly system of comb-type splicing template and steel pipe combined keel; correction and acceptance step, checking the location, elevation, verticality and frame firmness of the construction joint; concrete pouring step, pouring concrete on one side of the construction joint and vibrating it to compact it.

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