Underground structure support replacement construction system and construction method

Abstract

The present invention belongs to the field of building construction technology, and specifically relates to an underground structure replacement support construction system, including a bottom plate force transmission belt, a basement outer wall, a supporting member, a floor slab, and a replacement support belt integrally cast with the floor slab, the replacement support belt is located between the edge of the floor slab and the supporting pile, and the replacement support belt is arranged at intervals along the length direction of the sandwich cavity between the basement outer wall and the supporting pile; the sandwich cavity between the basement outer wall and the supporting pile is filled with yellow sand, and H-shaped steel is interspersed in the sandwich cavity along the vertical direction to compact the yellow sand. The present invention uses the yellow sand and H-shaped steel to compact the yellow sand, the replacement support belt is arranged at intervals, the bottom plate force transmission belt, the outer wall and the outer wall side backfilled with yellow sand and the inserted H-shaped steel form a whole, the enclosure structure has a large contact surface with the yellow sand, and the active earth pressure is evenly transmitted from the large surface to the main body of the constructed underground structure, so that the enclosure structure is firm and not easy to deform; the load of the replacement support belt is reduced, and the replacement support construction period is shortened.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction, and in particular relates to an underground structure support replacement construction system and a construction method. Background Art

[0002] Due to the construction organization and on-site operation requirements, the conventional practice for replacing supports for underground structures is to first cast the bottom plate and the bottom plate force transmission belt, then remove the lowest support, and wait until the construction of the lowest structure is completed and all the middle partition floor support belts (arranged at intervals) have formed strength before removing the previous support. This method takes a long time to operate and has complex construction technology. Since the contact area between the bottom plate force transmission belt and the middle partition force transmission belt is small, the force form is similar to multi-span hinged, and the foundation pit retaining deformation is large. This patent improves this by completing the waterproof construction of the outer side of the next layer of exterior wall in advance, backfilling yellow sand and H-shaped steel, increasing the contact area between the completed exterior wall and the retaining structure, and transmitting the active earth pressure on the retaining structure to the completed underground structure body, thereby reducing the deformation of the foundation pit and accelerating the construction progress. Summary of the invention

[0003] The purpose of the present invention is to provide an underground structure support replacement construction system and construction method, which can effectively disperse the active earth pressure on the foundation pit support piles, reduce the load on the support replacement belt, and shorten the support replacement construction period.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an underground structure support replacement construction system, comprising a bottom plate force transmission belt located at the bottom of a foundation pit, a basement outer wall arranged above the bottom plate force transmission belt and spaced apart from the foundation pit support piles, a supporting member horizontally supported between the support piles, a floor slab located at the upper end of the basement outer wall, and a support replacement belt integrally cast with the floor slab, the support replacement belt being located between the edge of the floor slab and the support piles, and a plurality of the support replacement belts being spaced apart along the length direction of a cavity between the basement outer wall and the support piles; the cavity between the basement outer wall and the support piles is filled with yellow sand, and H-shaped steels are interspersed in the cavity along the vertical direction to compact the yellow sand.

[0005] Furthermore, a waterproof layer and a waterproof protective layer are provided in sequence on the side of the basement outer wall opposite to the supporting piles.

[0006] Furthermore, the support member is provided with a guide member for guiding the H-shaped steel to be lowered in a vertical direction, and a pressurizing member for pushing the H-shaped steel to be inserted into the sand body.

[0007] Furthermore, the guide member includes a roller bracket detachably connected to the bottom surface of the support member, and a roller rotatably arranged on the roller bracket, the axis of the roller is horizontally arranged, and there are at least three rollers which are staggered in the vertical direction on both sides of the H-beam lowering path.

[0008] Furthermore, the pressure member includes a temporary track arranged along the edge of the foundation pit at the upper end of the supporting member, and a pulley running on the temporary track, a single hydraulic cylinder is arranged on the pulley in the vertical direction, a reinforcement rod is provided between the pulley and the supporting member, the reinforcement rod is obliquely arranged between the pulley and the supporting member, and the two ends of the reinforcement rod are respectively detachably connected to the pulley and the supporting member.

[0009] Furthermore, the upper ends of multiple H-shaped steels between two adjacent replacement support belts abut against the bottom surface of the same horizontally arranged I-beam, the piston rod of the single hydraulic cylinder abuts against the top surface of the I-beam, and a number of wooden pads are provided between the piston rod of the single hydraulic cylinder and the top surface of the I-beam.

[0010] The present invention also provides an underground structure replacement support construction method, which uses yellow sand to fill the cavity between the basement outer wall and the support piles, and then inserts H-shaped steel into the sand body to compact the yellow sand, so that the active earth pressure on the support piles is evenly transmitted to the underground structure body, including the following steps:

[0011] 1) Remove the horizontal support structure at the bottom of the support pile, construct the bottom plate force transmission belt and the basement outer wall at the bottom of the foundation pit, make the bottom plate force transmission belt and the basement outer wall reach the required strength after maintenance, and construct the waterproof layer and waterproof protective layer in sequence on the side of the basement outer wall facing the support pile;

[0012] 2) constructing a floor slab and a replacement support belt upward along the outer wall of the basement, the floor slab and the replacement support belt are integrally cast, the replacement support belt is located between the edge of the floor slab and the supporting piles, and a plurality of replacement support belts are arranged at intervals along the length direction of the cavity between the outer wall of the basement and the supporting piles;

[0013] 3) Fill the space between the basement outer wall and the support piles with yellow sand, then insert the H-shaped steel into the yellow sand vertically to compact the sand;

[0014] 4) Remove the horizontal support components of the support piles on the upper part of the floor slab, and after maintenance, make the floor slab and the replacement support belt reach the required strength, and then continue the construction of the superstructure.

[0015] Preferably, in step 3), the insertion of the H-shaped steel is constructed by using a guide member and a pressure member, the guide member includes a roller bracket detachably connected to the bottom surface of the supporting member, and a roller rotatably arranged on the roller bracket, the axis of the roller is arranged horizontally, and the rollers are at least three and are staggered on both sides of the H-shaped steel lowering path in the vertical direction; the pressure member includes a temporary track arranged along the edge of the foundation pit at the upper end of the supporting member, and a pulley running on the temporary track, a single hydraulic cylinder is arranged on the pulley in the vertical direction, a reinforcement rod is arranged between the pulley and the supporting member, the reinforcement rod is obliquely arranged between the pulley and the supporting member, and the two ends of the reinforcement rod are detachably connected to the pulley and the supporting member respectively; the upper ends of the multiple H-shaped steels between the adjacent two replacement support belts are abutted against the bottom surface of the same horizontally arranged I-beam, the piston rod of the single hydraulic cylinder is abutted against the top surface of the I-beam, and a number of wooden pads are arranged between the piston rod of the single hydraulic cylinder and the top surface of the I-beam; comprising the following steps:

[0016] a. Lay temporary tracks, pulleys and single hydraulic cylinders above the horizontal support members along the edge of the foundation pit, and install roller brackets and rollers at the bottom of the horizontal support members;

[0017] b. Insert the H-shaped steel between the rollers one by one, and place the horizontal I-shaped steel at the upper end of the H-shaped steel;

[0018] c. Move the pulley to the top of the horizontal I-beam and use a reinforcement rod to secure the pulley to the horizontal support member;

[0019] d. Drive the single hydraulic cylinder downward to push it out and contact the horizontal I-beam. The single hydraulic cylinder drives the I-beam and H-beam downward to insert the H-beam into the yellow sand. When the single hydraulic cylinder reaches the maximum extension, the piston rod retreats upward for a stroke, and a wooden pad is added to the I-beam. Then the piston rod is driven downward again. When the piston rod reaches the maximum extension again, repeat the above action until the H-beam is completely pressed into the yellow sand.

[0020] e. The piston cylinder of the single hydraulic cylinder retracts upward until it is fully reset, removes the I-beam and wooden pads, and at the same time removes the reinforcement rod between the pulley and the horizontal support member. Move the pulley to the next workstation and repeat the above steps bd until the insertion construction of all H-beams is completed.

[0021] The technical effect of the present invention is that: the present invention utilizes the yellow sand in combination with H-shaped steel, first pours the yellow sand, then inserts the H-shaped steel, compacts the yellow sand, arranges the replacement support belts at intervals, the bottom plate force transmission belt, the outer wall and the outer wall side backfilled with yellow sand and the inserted H-shaped steel form a whole, the contact surface between the retaining structure and the yellow sand is large, and the active earth pressure is evenly transmitted from the large surface to the main body of the constructed underground structure, so that the retaining structure is firm and not easy to deform; the load on the replacement support belt is reduced, and the replacement support construction period is shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the underground structure support replacement construction system provided by an embodiment of the present invention;

[0023] Figure 2-4 It is a principle diagram of the H-beam interlacing construction process of the present invention. DETAILED DESCRIPTION

[0024] The present invention is described in detail below with reference to the accompanying drawings.

[0025] Example 1

[0026] like Figure 1 As shown, an underground structure support replacement construction system includes a bottom plate force transmission belt 8 located at the bottom of a foundation pit, a basement outer wall 5 arranged above the bottom plate force transmission belt 8 and spaced apart from the foundation pit supporting piles 9, a supporting member 10 horizontally supported between the supporting piles 9, a floor slab 6 located at the upper end of the basement outer wall 5, and a support replacement belt 7 integrally cast with the floor slab 6, wherein the support replacement belt 7 is located between the edge of the floor slab 6 and the supporting piles 9, and a plurality of the support replacement belts 7 are spaced apart along the length direction of the sandwich cavity between the basement outer wall 5 and the supporting piles 9; the sandwich cavity between the basement outer wall 5 and the supporting piles 9 is filled with yellow sand 1, and H-shaped steels 2 are interspersed in the sandwich cavity along the vertical direction for compacting the yellow sand 1; a waterproof layer 4 and a waterproof protective layer 3 are sequentially provided on the side of the basement outer wall 5 opposite to the supporting piles 9. The present invention utilizes the yellow sand 1 in combination with the H-shaped steel 2, first pours the yellow sand 1, then inserts the H-shaped steel 2, compacts the yellow sand 1, arranges the replacement support belts 7 at intervals, and the bottom plate force transmission belt 8, the outer wall and the outer wall side are backfilled with the yellow sand 1 and the inserted H-shaped steel 2 to form a whole. The contact surface between the retaining structure and the yellow sand 1 is large, and the active earth pressure is evenly transmitted from the large surface to the main body of the constructed underground structure, so that the retaining structure is firm and not easy to deform; the load on the replacement support belt 7 is reduced, and the replacement support construction period is shortened.

[0027] Further, such as Figure 2-4 As shown, the support member 10 is provided with a guide member for guiding the H-beam 2 to be lowered in the vertical direction, and a pressure member for pushing the H-beam 2 into the sand body. The present invention uses the support structure of the foundation pit itself as a fulcrum to provide downward pressure for the H-beam 2, realizes the automatic positioning of the H-beam 2 for insertion, saves manpower, and improves construction efficiency.

[0028] The guide member includes a roller bracket 16 detachably connected to the bottom surface of the support member 10, and a roller 17 rotatably arranged on the roller bracket 16, the axis of the roller 17 is arranged horizontally, and the rollers 17 are at least three and are staggered in the vertical direction on both sides of the lowering path of the H-beam 2. Specifically, the roller bracket 16 is connected to the bottom structure of the horizontal support member 10 by bolts, which is convenient for modular dismantling after the construction is completed. Three rollers 17 are arranged, and the three rollers 17 are distributed in a triangle. Before the construction of the H-beam 2, it can be inserted between the three rollers 17 to achieve horizontal limiting and longitudinal guidance, and the rollers 17 will not block the I-beam 15 during the downward pressing process of the I-beam.

[0029] The pressure member includes a temporary track 11 arranged along the edge of the foundation pit at the upper end of the support member 10, and a pulley 12 running on the temporary track 11. A single hydraulic cylinder 13 is arranged on the pulley 12 in the vertical direction. A reinforcement rod 14 is arranged between the pulley 12 and the support member 10. The reinforcement rod 14 is arranged obliquely between the pulley 12 and the support member 10, and the two ends of the reinforcement rod 14 are detachably connected to the pulley 12 and the support member 10. The upper ends of the multiple H-shaped steels 2 between the two adjacent replacement support belts 7 are in contact with the bottom surface of the same horizontally arranged I-shaped steel 15, and the piston rod of the single hydraulic cylinder 13 is in contact with the top surface of the I-shaped steel 15. A number of wooden pads 18 are arranged between the piston rod of the single hydraulic cylinder 13 and the top surface of the I-shaped steel 15. The present invention arranges a single hydraulic cylinder 13 on the pulley 12, and only one or several hydraulic cylinders are needed to realize the construction of the H-shaped steel 2 of the entire foundation pit, which reduces the equipment cost and shortens the equipment construction period; the reinforcement rod 14 can provide sufficient pulling force for the pulley 12 during the pressurization process to prevent the pulley 12 from derailing; one hydraulic cylinder of the present invention can pressurize multiple H-shaped steels 2 at the same time, which greatly improves the construction efficiency of the H-shaped steel 2 and further shortens the construction period.

[0030] Example 2

[0031] A method for replacing support of an underground structure, using yellow sand 1 to fill the cavity between the basement outer wall 5 and the support pile 9, and then inserting H-shaped steel 2 into the sand body to compact the yellow sand 1, so that the active earth pressure on the support pile 9 is evenly transmitted to the underground structure body, including the following steps:

[0032] 1) Remove the horizontal support member 10 at the bottom of the support pile 9, construct the bottom plate force transmission belt 8 and the basement outer wall 5 at the bottom of the foundation pit, make the bottom plate force transmission belt 8 and the basement outer wall 5 reach the required strength after maintenance, and construct the waterproof layer 4 and the waterproof protective layer 3 in sequence on the side of the basement outer wall 5 facing the support pile 9;

[0033] 2) constructing a floor slab 6 and a replacement support belt 7 upward along the basement outer wall 5, the floor slab 6 and the replacement support belt 7 are integrally cast, the replacement support belt 7 is located between the edge of the floor slab 6 and the support pile 9, and a plurality of replacement support belts 7 are arranged at intervals along the length direction of the sandwich cavity between the basement outer wall 5 and the support pile 9;

[0034] 3) Fill the space between the basement outer wall 5 and the support piles 9 with yellow sand 1, and then insert the H-shaped steel 2 into the yellow sand 1 in the vertical direction to compact the yellow sand 1;

[0035] 4) Remove the support piles 9 and horizontal support members 10 on the upper part of the floor slab 6, and after curing, make the floor slab 6 and the replacement support belt 7 reach the required strength, and then continue to construct the upper structure.

[0036] Preferably, in step 3), the insertion of the H-shaped steel is carried out using a guide member and a pressure member, comprising the following steps:

[0037] a. A temporary track 11, a pulley 12 and a single hydraulic cylinder 13 are arranged above the horizontal support member 10 along the edge of the foundation pit, and a roller bracket 16 and a roller 17 are installed at the bottom of the horizontal support member 10;

[0038] b. Figure 2 As shown, the H-beam 2 is inserted between the rollers 17 in sequence, and the horizontal I-beam 15 is placed at the upper end of the H-beam 2;

[0039] c. Move the pulley 12 to above the horizontal I-beam 15, and use a reinforcing rod 14 to fix the pulley 12 to the horizontal support member 10;

[0040] d. Figure 3 , 4 As shown, the single hydraulic cylinder 13 is driven to push downward and abut against the horizontal I-beam 15, and the single hydraulic cylinder 13 drives the I-beam 15 and the H-beam 2 downward to insert the H-beam 2 into the yellow sand 1. When the single hydraulic cylinder 13 reaches the maximum extension, the piston rod retreats upward for a stroke, and a wooden pad 18 is added to the I-beam 15. Then the piston rod is driven downward again. When the piston rod reaches the maximum extension again, the above action is repeated until the H-beam 2 is completely pressed into the yellow sand 1.

[0041] e. The piston cylinder of the single hydraulic cylinder 13 is retracted upward until it is completely reset, and the I-beam 15 and the wooden pad 18 are removed. At the same time, the reinforcement rod 14 between the pulley 12 and the horizontal support member 10 is removed, and the pulley 12 is moved to the next workstation, and the above steps bd are repeated until the insertion construction of all H-beams 2 is completed.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An underground structure support replacement construction system, characterized in that: It includes a bottom plate force transmission belt located at the bottom of the foundation pit, a basement outer wall arranged above the bottom plate force transmission belt and spaced apart from the foundation pit supporting piles, a supporting member horizontally supported between the supporting piles, a floor slab located at the upper end of the basement outer wall, and a supporting belt integrally cast with the floor slab, wherein the supporting belt is located between the edge of the floor slab and the supporting piles, and a plurality of supporting belts are arranged at intervals along the length direction of the cavity between the basement outer wall and the supporting piles; the cavity between the basement outer wall and the supporting piles is filled with yellow sand, and H-shaped steel is interspersed in the cavity along the vertical direction to compact the yellow sand; the supporting member is provided with a guiding member for guiding the H-shaped steel to be lowered in the vertical direction, and a guiding member for pushing the H-shaped steel to be lowered in the vertical direction. The H-shaped steel is inserted into the pressure component of the sand body; the guiding component includes a roller bracket detachably connected to the bottom surface of the supporting component, and a roller rotatably arranged on the roller bracket, the axis of the roller is horizontally arranged, and there are at least three rollers which are staggered on both sides of the H-shaped steel lowering path in the vertical direction; the pressure component includes a temporary track arranged along the edge of the foundation pit at the upper end of the supporting component, and a pulley running on the temporary track, a single hydraulic cylinder is arranged on the pulley in the vertical direction, a reinforcement rod is arranged between the pulley and the supporting component, the reinforcement rod is obliquely arranged between the pulley and the supporting component, and the two ends of the reinforcement rod are detachably connected to the pulley and the supporting component respectively.

2. The underground structure support replacement construction system according to claim 1 is characterized in that: A waterproof layer and a waterproof protective layer are arranged in sequence on the side of the basement outer wall opposite to the supporting piles.

3. The underground structure support replacement construction system according to claim 2 is characterized in that: The upper ends of the multiple H-shaped steels between two adjacent replacement support belts abut against the bottom surface of the same horizontally arranged I-shaped steel, the piston rod of the single hydraulic cylinder abuts against the top surface of the I-shaped steel, and a plurality of wooden pads are provided between the piston rod of the single hydraulic cylinder and the top surface of the I-shaped steel.

4. A construction method of the underground structure support replacement construction system according to claim 3, characterized in that: The cavity between the outer wall of the basement and the supporting piles is filled with yellow sand, and then H-shaped steel is inserted into the sand to compact the yellow sand so that the active earth pressure on the supporting piles is evenly transmitted to the main body of the underground structure, including the following steps: 1) Remove the horizontal support structure at the bottom of the support pile, construct the bottom plate force transmission belt and the basement outer wall at the bottom of the foundation pit, make the bottom plate force transmission belt and the basement outer wall reach the required strength after maintenance, and construct the waterproof layer and waterproof protective layer in sequence on the side of the basement outer wall facing the support pile; 2) constructing a floor slab and a replacement support belt upward along the outer wall of the basement. The floor slab and the replacement support belt are integrally cast and formed. The replacement support belt is located between the edge of the floor slab and the supporting piles. A plurality of replacement support belts are arranged at intervals along the length direction of the cavity between the outer wall of the basement and the supporting piles; 3) Fill the space between the basement outer wall and the support piles with yellow sand, then insert the H-shaped steel into the yellow sand vertically to compact the sand; 4) Remove the horizontal support components of the support piles on the upper part of the floor slab, and after maintenance, make the floor slab and the replacement support belt reach the required strength, and then continue the construction of the superstructure.

5. The underground structure support replacement construction method according to claim 4 is characterized in that: In step 3), the insertion of the H-beam is constructed by using a guide member and a pressure member, the guide member includes a roller bracket detachably connected to the bottom surface of the support member, and a roller rotatably arranged on the roller bracket, the axis of the roller is arranged horizontally, and the rollers are at least three and are staggered on both sides of the H-beam lowering path in the vertical direction; the pressure member includes a temporary track arranged along the edge of the foundation pit at the upper end of the support member, and a pulley running on the temporary track, a single hydraulic cylinder is arranged on the pulley in the vertical direction, a reinforcement rod is arranged between the pulley and the support member, the reinforcement rod is obliquely arranged between the pulley and the support member, and the two ends of the reinforcement rod are detachably connected to the pulley and the support member respectively; the upper ends of the multiple H-beams between the adjacent two replacement support belts are abutted against the bottom surface of the same horizontally arranged I-beam, the piston rod of the single hydraulic cylinder is abutted against the top surface of the I-beam, and a number of wooden pads are arranged between the piston rod of the single hydraulic cylinder and the top surface of the I-beam; comprising the following steps: a. Lay temporary tracks, pulleys and single hydraulic cylinders above the horizontal support members along the edge of the foundation pit, and install roller brackets and rollers at the bottom of the horizontal support members; b. Insert the H-shaped steel between the rollers one by one, and place a horizontal I-shaped steel on the upper end of the H-shaped steel; c. Move the pulley to the top of the horizontal I-beam and use a reinforcing rod to secure the pulley to the horizontal support member; d. Drive the single hydraulic cylinder downward to push it out and contact the horizontal I-beam. The single hydraulic cylinder drives the I-beam and H-beam downward to insert the H-beam into the yellow sand. When the single hydraulic cylinder reaches the maximum extension, the piston rod retreats upward for a stroke, and a wooden pad is added to the I-beam. Then the piston rod is driven downward again. When the piston rod reaches the maximum extension again, repeat the above action until the H-beam is completely pressed into the yellow sand. e. The piston cylinder of the single hydraulic cylinder retracts upward until it is fully reset, removes the I-beam and wooden pads, and at the same time removes the reinforcement rod between the pulley and the horizontal support member. Move the pulley to the next workstation and repeat the above steps bd until the insertion construction of all H-beams is completed.

Images