A construction method for reinforcing the foundation of a crusher.

Abstract

This invention pertains to the installation of crushing mining machinery, and specifically relates to a construction method for reinforcing the foundation of a crusher. The method includes using two large-sized pre-embedded foundation shims fixed to both sides of the crusher, replacing the four auxiliary shims in the original installation process; chiseling pits of suitable size for placing the two shims into the ground surface using a pneumatic pick; welding H-beams to the bottom of the shims and embedding them between the foundation's reinforcing bars; creating vent holes at intervals on the shims; and installing buffer pads between the auxiliary shims and the crusher's foundation. This invention transfers the stress to the entire foundation interior by setting countersunk steel reinforcement holes on the foundation shims that correspond one-to-one with the foundation's threaded steel bars, and by welding shear stress-resistant components to the bottom of the foundation shims using short H-beams. Then, according to the reinforcement hole positions, pre-set threaded steel anchor bars and adjusting bolts are welded to the foundation's threaded steel bars, thereby improving the strength of the foundation shims and the reinforcing steel foundation.

Description

Technical Field

[0001] This invention belongs to the field of installation of crushing mining machinery and equipment, and particularly relates to a construction method for reinforcing the foundation of a crusher. Background Technology

[0002] The existing foundation installation process for crushers is as follows:

[0003] 1. After determining the center line of the crusher and its main shaft, locate the four feet of the crusher and the corresponding reserved anchor bolt holes on the ground. According to the size of the four feet of the crusher, use a pneumatic pick to chisel out four shallow pits with slightly larger length and width, and open four reserved anchor bolt holes. Use a plastic tube of the same size as the reserved anchor bolt hole to place in the reserved anchor bolt hole to prevent concrete from blocking the reserved hole during the later grouting.

[0004] 2. Make 4 iron auxiliary pads, slightly smaller than the size of the 4 shallow pits, with a thickness of about half the depth of the shallow pits. Make 4 holes on each of the 4 auxiliary pads, corresponding one-to-one with the 4 bolt holes reserved on the ground of the crusher installation foundation.

[0005] 3. Prepare the grout and pour it into the chiseled pit. Use the grout pouring method to fill the space between the auxiliary pad and the shallow pit foundation with concrete mortar. At the same time, use measuring instruments to level and align the pad.

[0006] 4. After the concrete mortar has solidified, position and fix the four feet of the crusher in their installation positions. Perform secondary grouting between the feet and the foundation. After solidification, use four bolts to tighten the feet of the crusher onto the ground foundation, thus completing the installation of the crusher.

[0007] After the above construction process was implemented, based on long-term actual production conditions, due to factors such as the large vibration and impact of the crusher, excessive pressure per unit area of ​​the foundation, lack of cushioning pads, insufficient connection strength between the auxiliary pad and the steel reinforcement foundation, and uneven stress caused by differences in the feed particle size of the crusher, the grouting layer of the jaw crusher was completely damaged in less than a year of operation. The four foundation feet of the crusher were not on the same plane, the crusher experienced abnormal vibration for a long time, and the foundation bolts broke due to long-term frequent tensile stress, making it impossible for the crusher to operate normally and posing a risk of equipment damage. Ultimately, this forced the upstream and downstream processes to shut down, seriously affecting production.

[0008] Therefore, the existing installation process cannot meet the long-term stable operation of the crusher at the production site. There is a need to provide a crusher foundation reinforcement structure and its construction method to reinforce the crusher foundation and achieve a certain buffering effect, which can effectively reduce the damage to the jaw crusher and the impact on production caused by long-term overload and abnormal vibration. Summary of the Invention

[0009] In order to overcome the defects of the existing technology, the purpose of this invention is to provide a construction method for reinforcing the foundation of a crusher, which strengthens the foundation of the crusher and makes it achieve a certain buffering effect, effectively reducing the harm of long-term overload and abnormal vibration to the jaw crusher and its impact on production.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A construction method for reinforcing the foundation of a crusher includes the following steps:

[0012] A pre-cast pit was chiseled out on each side of the ground foundation of the crusher;

[0013] Fabricate two foundation pads with multiple rebar holes that match the size of the precast pit;

[0014] A row of H-shaped short steel bars is welded longitudinally at equal intervals at the bottom of the foundation pad, and the H-shaped short steel bars are pre-embedded between the foundation threaded steel bars of the ground foundation;

[0015] Pre-install threaded steel anchor bars and adjusting bolts in the reinforcing bar holes of the two foundation shims, and spot weld the bottom of the adjusting bolts and threaded steel anchor bars to the top of the foundation threaded steel bars.

[0016] After leveling according to the pre-installation accuracy requirements of the crusher, plug welding is performed on the gaps between all adjusting bolts and steel bar holes, and the gaps between threaded steel anchor bars and steel bar holes. The surface of the foundation shim is ground flat in the corresponding area where the crusher feet are placed.

[0017] Secondary grouting is performed on the gap between the foundation pad and the inner wall of the precast pit to form a secondary grouting foundation.

[0018] Weld an auxiliary pad to each of the four positions on the foundation shims corresponding to the four feet of the crusher. The four auxiliary pads are provided with holes for the anchor bolts of the crusher. Lay a buffer pad on top of the four auxiliary pads, and install the crusher's feet at the four buffer pads.

[0019] Furthermore, a pre-cast pit is excavated on each side of the ground foundation of the crusher, including:

[0020] The precast pit is chiseled until the top layer of the foundation rebar is completely exposed at the bottom plane of the precast pit.

[0021] Furthermore, two foundation shims with multiple rebar holes are fabricated, matching the dimensions of the precast pit, including:

[0022] Control the position of the reinforcing bar holes to correspond one-to-one with the threaded steel bars in the foundation, and set countersunk holes above the reinforcing bar holes.

[0023] Furthermore, the fabrication of two foundation shims with multiple rebar holes, matching the dimensions of the precast pit, also includes:

[0024] Multiple ventilation holes are set at equal intervals along the longitudinal direction of the base shim.

[0025] Furthermore, the fabrication of two foundation shims with multiple rebar holes, matching the dimensions of the precast pit, also includes:

[0026] According to the positions of the four anchor bolt holes of the crusher, four anchor bolt holes are made at the corresponding positions of the foundation shims, and plastic tubes are inserted into each hole.

[0027] Furthermore, welding H-shaped short steel bars to the bottom of the foundation pad and pre-embedding the H-shaped short steel bars between the foundation threaded steel bars of the ground foundation includes:

[0028] The H-shaped short steel is placed at the symmetrical center of the four adjacent steel bar holes around it.

[0029] Furthermore, threaded steel anchor bars and adjusting bolts are pre-installed within the reinforcing bar holes of the two foundation shims, including:

[0030] Eight adjusting bolts are pre-set at eight symmetrical steel bar holes near the four crusher feet of the two foundation shims, and the top of the adjusting bolts is controlled to be higher than the upper surface of the foundation shims. Adjusting nuts are set at the bottom of the adjusting bolts.

[0031] Furthermore, the method includes pre-setting threaded steel anchor bars and adjusting bolts within the reinforcing bar holes of the two foundation shims, and also includes:

[0032] Pre-install threaded steel anchor bars in the remaining steel bar holes of the two foundation shims, and control the upper end of the threaded steel anchor bars not to exceed the upper surface of the foundation shims.

[0033] Furthermore, after spot welding the bottom of all adjusting bolts and threaded steel anchor bars to the top of the foundation threaded steel, the following steps are performed:

[0034] Adjust the elevation of the two foundation shims by rotating the eight adjusting nuts;

[0035] Two foundation shims were hoisted out, and all spot welds were reinforced.

[0036] Furthermore, the crusher's feet are installed at the four buffer pads, including:

[0037] Insert each of the four double-ended anchor bolts into the plastic tubes inside the four anchor bolt holes;

[0038] A steel washer and a buffer pad are sandwiched between the nut of the double-headed anchor bolt and the crusher foot.

[0039] Fill the space between the double-headed anchor bolts and the plastic pipe with fine sand and tamp it down.

[0040] The technical effects and advantages of this invention are as follows:

[0041] 1. This invention sets countersunk steel bar holes in the foundation pads that correspond one-to-one with the foundation threaded steel bars, and welds shear stress-resistant components to the bottom of the foundation pads using H-shaped short steel bars. Then, according to the steel bar hole positions, the pre-set threaded steel bar anchor bars and adjusting bolts are welded to the foundation threaded steel bars, thereby transferring the stress to the entire foundation interior and improving the strength of the foundation pads and the steel reinforcement foundation.

[0042] 2. This invention optimizes the existing construction process by replacing the four foundation pads located on both sides of the foundation with two pads, thereby increasing the contact area with the foundation and making the overall stress on the foundation more uniform.

[0043] 3. This invention uses an auxiliary pad to precisely adjust the installation accuracy of the crusher, eliminating deformation caused by welding of the pre-embedded foundation pads and secondary grouting.

[0044] 4. This invention absorbs part of the vibration and impact of the crusher by adding a buffer pad.

[0045] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0046] Figure 1 This is a flowchart illustrating a construction method for reinforcing the foundation of a crusher according to the present invention.

[0047] Figure 2 This is a top view of the basic support structure of the present invention;

[0048] Figure 3 This is a schematic diagram of the crusher foundation reinforcement structure of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of the crusher foot connector of the present invention. Detailed Implementation

[0050] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Figure 1 This is a flowchart illustrating a construction method for reinforcing the foundation of a crusher according to the present invention. Figure 1 As shown, this invention provides a construction method for reinforcing the foundation of a crusher, comprising the following steps:

[0052] A pre-cast pit was chiseled out on each side of the ground foundation of the crusher;

[0053] Fabricate two foundation pads with multiple rebar holes that match the size of the precast pit;

[0054] A row of H-shaped short steel bars is welded longitudinally at equal intervals at the bottom of the foundation pad, and the H-shaped short steel bars are pre-embedded between the foundation threaded steel bars of the ground foundation.

[0055] Pre-install threaded steel anchor bars and adjusting bolts in the reinforcing bar holes of the two foundation shims, and spot weld the bottom of all adjusting bolts and threaded steel anchor bars to the top of the foundation threaded steel bars.

[0056] After leveling according to the pre-installation accuracy requirements of the crusher, plug welding is performed on all adjusting bolts, threaded steel anchor bars and steel bar holes, and the surface of the foundation shim is ground smooth in the corresponding area for placing the crusher feet.

[0057] Secondary grouting is performed on the gap between the foundation pad and the inner wall of the precast pit to form a secondary grouting foundation.

[0058] Weld an auxiliary pad with anchor bolt holes at the four positions corresponding to the four feet of the crusher on the foundation shims. Lay a buffer pad on top of the four auxiliary pads, and install the crusher's feet at the four buffer pads.

[0059] Specifically, after determining the center line of the crusher main unit and main shaft, the crusher's feet are positioned on the ground foundation. Pre-cast pits, 6200mm long and 1000mm wide, are chiseled out on the surface of the ground foundation on both sides of the crusher using a pneumatic hammer. The chiseling depth is such that the uppermost layer of the foundation rebar is completely exposed. Then, two foundation pads, 6050mm long, 800mm wide, and 40mm thick, are fabricated. Figure 2 This is a top view of the basic support structure of the present invention, as shown in the figure. Figure 2As shown, D32 rebar holes are drilled at 160mm intervals in both the longitudinal and transverse directions on the two foundation shims. The upper part of each rebar hole is countersunk at a 45° angle, with a countersunk depth of 20mm. The rebar holes should correspond as closely as possible to the foundation rebar threads. Multiple D100 ventilation holes (e.g., three) are drilled at equal longitudinal intervals on both foundation shims. D80 anchor bolt holes are drilled on the foundation shims according to the positions of the four anchor bolt holes for the crusher, and plastic tubes are inserted into each of the four anchor bolt holes. Longitudinal intervals are also made on the lower surface of the two foundation shims. A row of H-shaped short steel bars with specifications of 100*100*6*6 and a length of 250mm is welded 640mm. The center point of each H-shaped short steel bar is located at the symmetrical center formed by four adjacent steel bar holes around it. Eight M30 adjusting bolts are pre-set at the corresponding eight symmetrical steel bar holes near the four crusher feet of the two foundation shims. The threads of the adjusting bolts are controlled to be about 40mm lower than the lower surface of the foundation shims, so that the top of the adjusting bolts is higher than the upper surface of the foundation shims. This makes it easy to adjust and lock the position before welding. Finally, the adjusting nut is screwed on the bottom of the adjusting bolt.

[0060] Figure 3 This is a schematic diagram of the crusher foundation reinforcement structure of the present invention, as shown below. Figure 3 As shown, according to the position of the H-shaped short steel, pre-drilled holes with a length of 150mm and a width of 150mm are made in the ground foundation. Two foundation pads are placed in the pre-cast pits on both sides, and the H-shaped short steel is placed in the pre-drilled holes and fixed. The depth of the pre-drilled holes is such that the upper surface of the foundation pad is not higher than the ground foundation. A certain length of D30 threaded steel anchor bars are pre-installed in all other steel bar holes of the foundation pad, and the upper end of the threaded steel anchor bars is controlled to not exceed the upper surface of the foundation pad. All adjusting bolts and threaded steel anchor bars were spot-welded to the top of the foundation threaded steel. The elevation of the two foundation shims was then adjusted by rotating eight adjusting nuts. The two foundation shims were then lifted out using a crane, and all spot-welded areas were reinforced. After welding, the foundation shims were reinserted and leveled according to the crusher's pre-installation accuracy (elevation error of the four feet less than 2mm). All gaps in the adjusting bolts, threaded steel anchor bars, and rebar holes were plugged and welded. After welding, the surface of the foundation shims was ground smooth in the corresponding area where the crusher's feet would be placed. Secondary grouting was performed using a high-pressure grouting method at the pouring opening formed around the foundation shims and the inner wall of the pre-cast pit, allowing the grout to emerge from the pre-set vents, forming a secondary grouting foundation.

[0061] Figure 4 This is a structural schematic diagram of the crusher foundation connector of the present invention, as shown below. Figure 4As shown, four auxiliary pads with the same dimensions as the crusher's foundation feet (two 1200mm long and 450mm wide, and two 1600mm long and 450mm wide) are made, with a thickness of 30mm. Holes for the four foundation bolts for the crusher are also made. The surface roughness of the upper and lower surfaces of the auxiliary pads reaches 12.5μm. Leveling and alignment are achieved through grinding and adding adjusting shims to ensure that the relative elevation error of the four auxiliary pads is within 0.05mm. Finally, the four auxiliary pads are welded to the corresponding positions on the upper surface of the foundation shims. A 10mm thick buffer pad is installed on the upper surface of each of the four auxiliary pads. The crusher foot is then installed on the upper surface of the buffer pad. Four M80 double-ended anchor bolts are inserted into the plastic tubes in the four anchor bolt holes. Fine sand is filled into the gap between the M80 double-ended anchor bolts and the plastic tubes and tamped down to prevent the double-ended anchor bolts from shaking inside the plastic tubes. Steel washers and buffer pads are sandwiched between the nuts of the double-ended anchor bolts and the crusher foot, thus completing the construction of the crusher foot foundation reinforcement.

[0062] After implementing the foundation reinforcement and renovation construction process, the jaw crusher has been operating stably for over two years without any foundation damage or anchor bolt breakage. The crusher's operating rate has significantly improved, resulting in substantial economic and social benefits. This invention enables the long-term stable and efficient operation of the crusher, ensuring smooth production.

[0063] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A construction method of a crusher foundation reinforcement structure, characterized by, The method comprises the following steps: Respectively dig a pre-pouring pit on the ground foundation on both sides of the crusher; Manufacture two foundation pads with multiple steel bar hole positions and matching the size of the pre-pouring pit; Weld a column of H-shaped short steels on the bottom of the foundation pad longitudinally and equidistantly, and pre-bury the H-shaped short steels between the foundation screw steels of the ground foundation; Pre-set screw anchor steels and adjusting bolts in the steel bar hole positions of the two foundation pads, and spot weld the bottom of the adjusting bolts and screw anchor steels to the top of the foundation screw steels; After leveling according to the pre-installation accuracy requirement of the crusher, plug weld the gap of all adjusting bolts and steel bar hole positions, the gap of screw anchor steels and steel bar hole positions, polish the surface of the foundation pad used for placing the corresponding area of the foot of the crusher, and polish the surface of the foundation pad used for placing the corresponding area of the foot of the crusher; Secondary grouting is performed on the gap between the four sides of the foundation pad and the inner wall of the pre-pouring pit, and a secondary grouting foundation is formed; Weld an auxiliary pad on the position corresponding to the four feet of the crusher on the foundation pad, the four auxiliary pads are provided with hole positions for installing the foot bolts of the crusher, lay a buffer pad above the four auxiliary pads, and install the feet of the crusher at the four buffer pads.

2. The construction method of a crusher foundation reinforcement structure according to claim 1, characterized in that, The step of respectively digging a pre-pouring pit on the ground foundation on both sides of the crusher comprises the following steps: Dig the pre-pouring pit to the uppermost layer of the foundation screw steels, so that the bottom plane of the pre-pouring pit is completely exposed.

3. The construction method of a crusher foundation reinforcement structure according to claim 1, characterized in that, The step of manufacturing two foundation pads with multiple steel bar hole positions and matching the size of the pre-pouring pit comprises the following steps: Control the steel bar hole positions to correspond to the foundation screw steels one by one, and set a counterbore on the upper part of the steel bar hole positions.

4. The construction method of a crusher foundation reinforcement structure according to claim 3, characterized in that, The step of manufacturing two foundation pads with multiple steel bar hole positions and matching the size of the pre-pouring pit further comprises the following steps: Set multiple air holes on the foundation pad longitudinally and equidistantly.

5. The construction method of a crusher foundation reinforcement structure according to claim 3, characterized in that, The step of manufacturing two foundation pads with multiple steel bar hole positions and matching the size of the pre-pouring pit further comprises the following steps: According to the positions of the four bolt holes of the feet of the crusher, open four foot bolt holes in the corresponding positions of the foundation pad and respectively plug in plastic pipes.

6. The construction method of a crusher foundation reinforcement structure according to claim 1, characterized in that, The step of welding a column of H-shaped short steels on the bottom of the foundation pad longitudinally and equidistantly and pre-burying the H-shaped short steels between the foundation screw steels of the ground foundation comprises the following steps: Set the H-shaped short steels at the symmetry centers of the four adjacent steel bar hole positions around the H-shaped short steels.

7. The construction method of a crusher foundation reinforcement structure according to claim 1, characterized in that, The step of pre-setting screw anchor steels and adjusting bolts in the steel bar hole positions of the two foundation pads comprises the following steps: Pre-set eight adjusting bolts in the eight symmetrical steel bar hole positions near the four feet of the crusher of the two foundation pads, control the top end of the adjusting bolt to be higher than the upper surface of the foundation pad, and set an adjusting nut on the bottom end of the adjusting bolt.

8. The construction method of a crusher foundation reinforcement structure according to claim 7, characterized in that, The step of pre-setting screw anchor steels and adjusting bolts in the steel bar hole positions of the two foundation pads further comprises the following steps: Pre-set screw anchor steels in the remaining steel bar hole positions of the two foundation pads, and control the upper end of the screw anchor steel to not exceed the upper surface of the foundation pad.

9. The construction method of a crusher foundation reinforcement structure according to claim 8, characterized in that, After spot welding the bottom of all adjusting bolts and screw anchor steels to the top of the foundation screw steels, the following steps are included: Rotate the eight adjusting nuts to adjust the elevation of the two foundation pads; The two base pads are lifted out and all spot welding parts are reinforced and welded.

10. The construction method of a crusher foundation reinforcement structure according to claim 5, characterized in that, The four crusher foots are installed at the four buffer pads respectively. Four double-headed foot bolts are respectively inserted into the plastic pipes in the four foot bolt holes. Steel pads and buffer pads are clamped between the nuts of the double-headed foot bolts and the crusher foots. The double-headed foot bolts are filled with fine sand and tamped between the double-headed foot bolts and the plastic pipes.

Images