CN205742215U - A kind of reusable pipe gallery pattern foundation pit supporting structure and structure external mold combinative structure - Google Patents

Abstract

This utility model relates to a kind of reusable pipe gallery pattern foundation pit supporting structure and structure external mold combinative structure, belongs to underground engineering field.This utility model is vertically propped up gear and constitutes with structure external mold assembled unit and horizontal support structure by the foundation ditch of pipe gallery foundation ditch both sides, foundation ditch vertically props up gear and includes secondary triaxial cement mixing pile, two pieces of interpolation templates, two shaped steel unit with structure external mold assembled unit, shaped steel unit includes interpolation shaped steel, guide groove shaped steel, cushion block, fastener, being provided with cushion block between interpolation shaped steel and guide groove shaped steel and be bolted, the top of guide groove shaped steel is connected with interpolation shaped steel by fastener.When this utility model solves Urban Underground pipe gallery open cut excavation, work space is limited, the problem enough setting up space cannot be provided for structure external mold, and whole components that this structure is in addition to triaxial cement mixing pile can be fabricated to the standard component of detachable recombinant, reach the purpose of the recyclable recycling of whole standard element, facilitate fixed and positioned.

Description

A reusable combined structure of comprehensive pipe gallery foundation pit support and structural external formwork

Technical field

The utility model relates to a reusable comprehensive pipe gallery foundation pit support and structure outer mold combined structure, which belongs to the field of underground engineering.

Background technique

At present, various underground pipelines are three-dimensional structures independent of each other. The expansion and maintenance of various pipelines often cause road "zippers", seriously affecting urban traffic and city appearance. More and more cities are beginning to plan to build urban underground comprehensive utility corridors to solve the problem of road "zipper". However, urban underground comprehensive utility corridors are mainly laid out under municipal roads, and the available open-cut excavation work space is limited and cannot be used for underground construction. The external formwork of the comprehensive pipe gallery structure provides enough space for erection; in addition, when constructing the underground comprehensive pipe gallery on the municipal road, the excavation space should be minimized to avoid occupying the width of the municipal road during construction, and provide conditions for urban traffic flow, thus reducing the construction cost. The problem of digging space has great technical value and economic significance.

Utility model content

In order to better solve the above problems, the utility model proposes a reusable combined structure of comprehensive pipe gallery foundation pit support and structural external formwork, which can reduce the excavation space and solve the problem of open excavation of urban underground comprehensive pipe gallery. The working space is limited, and it is impossible to provide enough erection space for the structural external formwork.

The technical solution adopted by the utility model is: a reusable comprehensive pipe gallery foundation pit support and structural outer mold combination structure, which is composed of the vertical support of the foundation pit on both sides of the comprehensive pipe gallery foundation pit and the structural outer mold combined unit 9 and a horizontal support structure 10 constitute.

The combined unit 9 of the vertical support of the foundation pit and the external formwork of the structure includes a pair of three-axis cement-soil mixing piles 1, two interpolated templates 6, and two shaped steel units 8. The shaped steel units 8 include inserted shaped steel 2, Guide channel profile steel 3, spacer 5, fastener 7, spacer 5 is set between the insert profile steel 2 and guide channel profile steel 3 and fixed by bolt 4, the upper part of guide channel profile steel 3 is connected with the insert profile steel 2 through the fastener 7 connect.

The horizontal support structure 10 includes crown beams and steel pipe supports. The crown beams are fixed to the interpolated section steel 2 by pull bolts. The steel pipe supports are supported on the vertical support structures of the foundation pit of the underground comprehensive pipe gallery at both ends through the crown beams.

Except for the three-axis cement-soil mixing pile 1, the combined unit 9 of the vertical support and external formwork of the foundation pit and the horizontal support structure 10 are all standard components that can be spliced and disassembled repeatedly.

The diameter of the three-axis cement-soil mixing pile 1 is 850mm, the overlap is 250mm, and the length is selected according to the geological conditions and the buried depth of the integrated pipe gallery.

The pile top elevation of the three-axis cement-soil mixing pile 1 is 0.5m lower than the ground.

Described interpolation template 6 adopts high 2000mm, wide 1500mm, the HDPE material of thick 20mm or high 2000mm, wide 1500mm, the steel material of thick 8mm is made.

The inserted section steel 2 and the fastener 7 are fastened by a square bar.

The interpolation steel 2 adopts H-shaped steel with a model of HM400×300~600×300.

The guide channel section steel 3 adopts the hot-rolled common channel steel of type 22, the distance from the top to the interpolation section steel 2 is 400mm, and the length is 3m~6m, which is selected according to the buried depth of the bottom plate of the underground structure and the thickness of the cushion layer.

The fastener 7 is composed of three HRB335 steel bars with a diameter of 18-20 mm, one of which is 260 mm long and passes through the flanges on both sides of the guide channel steel bar, and the other two 280 mm long steel bars are bent 360 degrees at one end and fixed to pass through On the reinforcing bars of the flanges at the two ends of the channel shaped steel, the other end is bent into a hook and fixed to the side flanges of the inserted shaped steel 2 respectively.

The spacer 5 is made of HDPE material with a height of 150mm, a width of 260mm, and a thickness of 35mm.

The model of the bolt 4 is M16.

The crown beam in the horizontal support structure 10 adopts two channel steels, H-shaped steels or I-beams of 28-40#, and the steel pipe support adopts double I-beams of 22-36#.

The utility model uses steps as follows:

The outer side of the underground comprehensive pipe gallery structure is widened by 50mm on each side to obtain the excavation line of the foundation pit; the central axis of the three-axis cement-soil mixing pile 1 on both sides of the foundation pit is 311mm away from the excavation line of the foundation pit during construction; the inner sideline of the interpolated steel 2 is located at Foundation pit excavation line.

(1) Install the guide channel profiled steel 3 on an interpolated profiled steel 2 through the spacer 5 with bolts 4 to form a profiled steel unit 8;

(2) Repeat the above process to prefabricate all required steel units 8 .

(3) Plane control network at the surveying and launching site;

(4) Stake out the axis, excavate a trench with a width of 1.0m and a depth of 0.55m, set out the pile position, and put the pile driver in place;

(5) Adopting the arrangement of inserting two jumps and one jumping, after the completion of the construction of the three-axis cement-soil mixing pile 1, insert the section steel unit 8 successively;

(6) When sinking to the design elevation, loosen the top bolts 4 of the two steel units 8, and take out the upper pad 5;

(7) Insert the first insert template 6 between the guide channel profile steel 3 and the insert profile steel 2, and buckle the upper buckle of the guide channel profile steel and the insert profile steel when it is inserted into the appropriate position in the three-axis cement-soil mixing pile piece 7;

(8) After the first interpolation formwork 6 sinks to the design elevation, open the upper fastener 7, insert the second interpolation formwork 6, and buckle the upper fastener again when it is inserted into the appropriate position of the three-axis cement-soil mixing pile 7;

(9) When the second interpolation formwork 6 sinks to the design elevation, form a combination unit 9 of the vertical support of the foundation pit and the external formwork of the structure in a pair of triaxial cement-soil mixing pile 1;

(10) Repeat the above process to complete the foundation pit vertical support and structural external formwork combination unit 9 on both sides of the comprehensive pipe gallery foundation pit in sequence;

(11) After the triaxial cement-soil mixing pile 1 reaches 75% strength, excavate the earthwork and construct the horizontal support structure 10 in accordance with the principle of "supporting first, then digging, time-limited support, layered excavation, and over-excavation is strictly prohibited";

(12) When excavating to the design elevation of the bottom of the guide channel section steel 3, that is, the bottom of the cushion layer 11, loosen the high-strength bolts 4 at the bottom of the inserted section steel 2 and the guide channel section steel 3, so that the guide channel section steel 3 and the inserted formwork 6 fall off and recover , take back the floor cushion block 5, and obtain a smooth external mold of the underground structure on the three-axis deep stirring pile 1;

(13) Manually remove the excess cement and soil between the 9 rooms of the two combined units;

(14) as a cushion layer 11;

(15) Bind the steel bars of the bottom plate and side wall of the comprehensive pipe gallery 12, and support the interpolation formwork of 1/3 of the height of the side wall, and pour the concrete of the bottom plate and side wall of the comprehensive pipe gallery 11 of 1/3 height;

(16) After the bottom slab concrete reaches the design strength, roughen the top construction joints of the constructed side walls, support the top slab, insert formwork for the remaining 2/3 of the side wall height and bind the top slab steel bars, and pour the rest of the top slab and side walls 2/3 height concrete;

(17) After the concrete reaches the design strength, backfill the earth in layers to 20cm~50cm below the horizontal support, and remove the horizontal support structure 10;

(18) Recover the inserted section steel 2 by means of jumping, and fill the gap with grouting in time;

(19) Finally restore the original facilities on the road surface.

The beneficial effects of the utility model are: the combined structure of the reusable comprehensive pipe gallery foundation pit support and the structure outer mold can reduce the excavation space, and solve the problem that the working space of the urban underground comprehensive pipe gallery is limited and cannot be used for the structure. The external formwork provides enough space for erection, and all components of the structure except the triaxial cement-soil mixing pile can be made into detachable standard parts, which is convenient for installation and positioning, so that the inner formwork can be accurately inserted into the triaxial cement-soil mixing pile Among the piles, the combination unit of all the vertical supports of the foundation pit and the external formwork of the structure is well formed in the three-axis cement-soil mixing pile, which reduces the loss of components and achieves the purpose of recyclable recycling of all standard components, which is economical and green. The advantages of environmental protection, energy saving, and little impact on the surrounding environment.

Description of drawings

Fig. 1 is the schematic diagram of the front elevation of the medium-sized steel unit of the utility model;

Fig. 2 is the schematic plan view of the medium-sized steel unit of the utility model;

Fig. 3 is the side elevation schematic diagram of the medium-sized steel unit of the utility model;

Slot schematic diagram in Fig. 4 the utility model;

Fig. 5 completion schematic diagram of the medium-sized steel unit of the utility model;

Fig. 6 is a schematic cross-sectional view of the formation of the vertical support block of the foundation pit and the combined unit of the structural outer mold in the utility model;

Fig. 7 completion schematic diagram of cushion layer construction in the utility model;

Fig. 8 is a schematic diagram of the construction of 1/3 high underground comprehensive pipe gallery in the utility model;

Figure 9 is a schematic diagram of the completion of the construction of the underground comprehensive pipe gallery in the utility model;

Fig. 10 is a schematic cross-sectional view of removing the inserted section steel in the utility model;

The schematic diagram that construction is completed in Fig. 11 the utility model;

Each label in the figure: 1—three-axis cement-soil mixing pile; 2—interpolated steel; 3—guiding channel steel; 4—bolt; 5—pad; 6—interpolated formwork; 7—fastener; 8—shaped steel unit ; 9—combined unit of vertical support and external formwork of foundation pit; 10—horizontal support structure; 11—cushion layer; 12—comprehensive pipe gallery.

detailed description

The utility model will be described in further detail below through the accompanying drawings and embodiments, but the protection scope of the utility model is not limited to the content described.

Example 1: As shown in Figure 1-11: According to the conditions of surrounding buildings and surrounding roads, an integrated pipe gallery 12 with a section height of 3,800 mm and a width of 5,000 mm was constructed using the open cut method. C40 reinforced concrete with an impermeability grade of P8 is used, of which HRB400 steel bars with a diameter of 16mm are used, and a 150mm thick C20 plain concrete cushion is used. Firstly, the guide channel section steel 3 utilizes HDPE spacers with a height of 150 mm, a width of 260 mm, and a thickness of 35 mm to be installed on the interpolated section steel 2 through M16 bolts 4 to form a section steel unit 8, and repeat the above process to prefabricate all required section steel units. The inserting section steel 2 adopts H-section steel, among which the type of H-section steel is HM500×300, and the length is 12m; the guide channel section steel 3 is hot-rolled ordinary channel steel, the type is 22, and the length is 6.75m; the fastener 7 is composed of three HRB335 steel bars with a diameter of 18mm One of the steel bars with a length of 260mm passes through the flanges on both sides of the channel steel 3; one end of the other two steel bars with a length of 280mm is bent 360 degrees and fixed on the steel bars passing through the flanges at both ends of the channel steel 3, and the other end The bent hooks are respectively fixed to the side flanges of the inserted section steel 2. Measure and lay out the site plane control network, stake out the axis, excavate a trench with a width of 1.0m and a depth of 0.55m, set out the pile position, and put the pile driver in place. After the construction of the three-axis cement-soil mixing pile with a diameter of 850 mm and an overlap of 250 mm is completed, the section steel unit 8 is successively inserted into the three-axis cement-soil mixing pile 1 in the arrangement of inserting two jumps and one jumping. When sinking to the design elevation, loosen the top bolts 4 of the two steel units 8, and take out the upper spacer 5; insert the first interpolation template 6 between the channel steel 3 and the interpolation steel 2, when it is inserted Fasten the upper fastener 7 of the guide channel section steel 3 and the insertion section steel 2 when the three-axis cement-soil mixing 1 pile is in an appropriate position; the first interpolation formwork 6 sinks to the design elevation and then opens the fastener 7 and inserts the second piece Insert the formwork 6, when it is inserted into the appropriate position of the three-axis cement-soil mixing pile 1, buckle the fastener 7 again; when the second interpolation formwork 6 sinks below the designed road surface 1 to form a combination unit 9 of the vertical support of the foundation pit and the external formwork of the structure. Wherein, each interpolation template 6 adopts a HDPE board with a height of 2000 mm, a width of 1500 mm and a thickness of 20 mm. Repeat the above process to complete the foundation pit vertical support and structural external form combination unit 9 on both sides of the foundation pit of the comprehensive pipe gallery in sequence; after the strength of the triaxial cement-soil mixing pile 1 reaches 1MPa, follow the "support first, then dig, and support within a limited time" Excavation of earthwork and construction of horizontal support structure 10 according to the principle of "excavation in layers, and prohibiting over-excavation". When excavating to the design elevation of the bottom of the guide channel section steel 3, that is, the bottom of the cushion layer 11, loosen the bolts 4 at the bottom of the insert section steel 2 and the guide channel section steel 3, so that the guide channel section steel 3 and the insert template 6 fall off and recover, and take back the bottom plate Pad block 5, a smooth underground structure outer mold is obtained on the triaxial cement-soil mixing pile 1. In order to ensure the flatness between the vertical supports of the two foundation pits and the combined unit 9 of the external formwork of the structure, it is necessary to manually chisel away the excess cement and soil between the two combined units after the interpolation formwork 6 is removed. Then apply the cushion 11, bind the reinforcement of the bottom plate and side wall of the comprehensive pipe gallery 12, and support the inner formwork of 1/3 side wall height, and pour the concrete of the bottom plate and side wall 1/3 height of the comprehensive pipe gallery 12. After the bottom slab concrete reaches the design strength, roughen the construction joints at the top of the constructed side wall, support the top slab and the inner formwork of the remaining 2/3 of the side wall height and bind the roof steel bars, and pour the remaining 2/3 of the height of the top slab and side wall concrete. After the concrete reaches the design strength, backfill the earth in layers to a place 500mm below the horizontal support structure 10, and remove the horizontal support structure 10. Recover the inserted section steel 2 by means of jumping, and fill the gap with grouting in time. Finally, restore the original facilities on the pavement.

Example 2: As shown in Figure 1-11: the comprehensive pipe gallery 12 with a section height of 3,800 mm and a width of 5,000 mm is constructed using the open cut method. C40 reinforced concrete, in which HRB400 steel bars with a diameter of 16mm are used, and a 150mm thick C20 plain concrete cushion is used. Firstly, the guide channel section steel 3 is installed on the insert section steel 2 by using the HDPE spacer 5 with a height of 150 mm, a width of 260 mm and a thickness of 35 mm through M16 bolts 4 to form a section steel unit 8; Inserted steel 2 is H-shaped steel, of which the type of H-shaped steel is HM400×300, and the length is 9m; the type of guide channel steel 3 is ordinary channel steel of 22, and the length is 4.75m; the fastener 7 is composed of three HRB335 steel bars with a diameter of 18mm , one of the steel bars with a length of 260mm passes through the flanges on both sides of the guide channel steel 3; Bending hooks are respectively fixed on the side flanges of the inserted section steel 2. Measure and lay out the site plane control network, stake out the axis, excavate a trench with a width of 1.0m and a depth of 0.55m, set out the pile position, and put the pile driver in place. After the construction of the three-axis cement-soil mixing pile 1 with a diameter of 850 mm and a lap joint of 250 mm is completed, the section steel unit 8 is successively inserted into the three-axis cement-soil mixing pile 1 by means of two insertions and one jump. When sinking to the design elevation, loosen the top bolts 4 of the two steel units 8, and take out the upper spacer 5; insert the first interpolation template 6 between the channel steel 3 and the interpolation steel 2, when it is inserted When the three-axis cement-soil mixing pile 1 is in the proper position, fasten the fastener 7 of the guide channel section steel 3 and the interpolation section steel 2; the first interpolation formwork 6 sinks to the design elevation and then opens the fastener 7 and inserts it into the second Insert the formwork 6, when it is inserted into the proper position of the three-axis cement-soil mixing pile 1, fasten the fastener 7 again; A combined unit 9 of the vertical support of the foundation pit and the external formwork of the structure is formed. Wherein, each interpolation template 6 adopts a HDPE board with a height of 2000 mm, a width of 1500 mm and a thickness of 20 mm. Repeat the above process to complete the foundation pit vertical support and structural external formwork combination unit 9 on both sides of the foundation pit of the comprehensive pipe gallery in sequence; Excavate earthwork and construct horizontal support structure 10 according to the principle of supporting, layered excavation, and strictly prohibiting over-excavation". When excavating to the design elevation of the bottom of the guide channel section steel 3, that is, the bottom of the cushion layer 11, loosen the bolts 4 at the bottom of the insert section steel 2 and the guide channel section steel 3, so that the guide channel section steel 3 and the insert template 6 fall off and recover, and take back the bottom plate Pad block 5, a smooth underground structure outer mold is obtained on the triaxial cement-soil mixing pile 1. In order to ensure the flatness between the vertical supports of the two foundation pits and the combined unit 9 of the external formwork of the structure, it is necessary to manually chisel away the excess cement and soil between the two combined units after the interpolation formwork is removed. Then apply the cushion 11, bind the reinforcement of the bottom plate and side wall of the comprehensive pipe gallery 12, and support the inner formwork of 1/3 side wall height, and pour the concrete of the bottom plate and side wall 1/3 height of the comprehensive pipe gallery 12. After the bottom slab concrete reaches the design strength, roughen the construction joints on the top of the constructed side wall, support the top slab and the inner formwork of the remaining 2/3 of the side wall height and bind the roof steel bars, and pour the remaining 2/3 of the height of the top slab and side wall concrete. After the concrete reaches the design strength, backfill the earth in layers to a place 500mm below the horizontal support structure 10, and remove the horizontal support structure 10. Recover the inserted section steel 2 by means of jumping, and fill the gap with grouting in time. Finally, restore the original facilities on the pavement.

Claims (12)

1. reusable pipe gallery pattern foundation pit supporting structure and a structure external mold combinative structure, vertically props up gear and structure external mold assembled unit (9) and horizontal support structure (10) including foundation ditch；

Described foundation ditch vertically props up gear and includes a secondary triaxial cement mixing pile (1), two pieces of interpolation templates (6), two shaped steel unit (8) with structure external mold assembled unit (9), described shaped steel unit (8) includes interpolation shaped steel (2), guide groove shaped steel (3), cushion block (5), fastener (7), being provided with cushion block (5) between interpolation shaped steel (2) and guide groove shaped steel (3) and fixed by bolt (4), the top of guide groove shaped steel (3) is connected with interpolation shaped steel (2) by fastener (7)；

Described horizontal support structure (10) includes Guan Liang and steel pipe support, and Guan Liang is fixed with interpolation shaped steel (2) by split bolt, and steel pipe support is supported on the vertical retaining structure of underground pipe gallery foundation ditch of two ends by Guan Liang.

Reusable pipe gallery pattern foundation pit supporting structure the most according to claim 1 and structure external mold combinative structure, it is characterised in that: the miscellaneous part that described foundation ditch vertically props up in gear and structure external mold assembled unit (9) and horizontal support structure (10) in addition to triaxial cement mixing pile (1) is the standard element of repeatable splicing and dismounting.

Reusable pipe gallery pattern foundation pit supporting structure the most according to claim 1 and structure external mold combinative structure, it is characterized in that: described triaxial cement mixing pile (1) a diameter of 850mm, overlap joint 250mm, length is chosen according to the buried depth of geological conditions and pipe gallery.

Reusable pipe gallery pattern foundation pit supporting structure the most according to claim 2 and structure external mold combinative structure, it is characterised in that: described triaxial cement mixing pile (1) stake top mark height is in ground 0.5m.

Reusable pipe gallery pattern foundation pit supporting structure the most according to claim 1 and structure external mold combinative structure, it is characterized in that: described interpolation template (6) uses high 2000mm, wide 1500mm, the HDPE material of thick 20mm or high 2000mm, wide 1500mm, the steel of thick 8mm.

Reusable pipe gallery pattern foundation pit supporting structure the most according to claim 1 and structure external mold combinative structure, it is characterised in that: by side's bar clamping between described interpolation shaped steel (2) and fastener (7).

The most reusable pipe gallery pattern foundation pit supporting structure and structure external mold combinative structure, it is characterised in that: described interpolation shaped steel (2) uses model to be the H profile steel of HM400 × 300 ~ 600 × 300.

Reusable pipe gallery pattern foundation pit supporting structure the most according to claim 1 and structure external mold combinative structure, it is characterized in that: the common channel-section steel of hot rolling that described guide groove shaped steel (3) uses model to be 22, distance 400mm on top distance interpolation shaped steel (2), a length of 3m ~ 6m, base plate buried depth and cushion thickness according to underground structure are chosen.

The most reusable pipe gallery pattern foundation pit supporting structure and structure external mold combinative structure, it is characterized in that: described fastener (7) is made up of the HRB335 level reinforcing bar of three diameter 18 ~ 20mm, wherein the reinforcing bar of root length 260mm is through the edge of a wing on guide groove shaped steel both sides, reinforcing bar one end of other two root lengths 280mm bends 360 degree and is fixed on the reinforcing bar on the edge of a wing, guide groove shaped steel two ends, and the other end is converted into hook and is separately fixed at the side edge of a wing of interpolation shaped steel (2).

Reusable pipe gallery pattern foundation pit supporting structure the most according to claim 1 and structure external mold combinative structure, it is characterised in that: described cushion block (5) uses high 150mm, wide 260mm, the HDPE material of thick 35mm.

11. reusable pipe gallery pattern foundation pit supporting structures according to claim 1 and structure external mold combinative structure, it is characterised in that: the model of described bolt (4) is M16.

12. the most reusable pipe gallery pattern foundation pit supporting structures and structure external mold combinative structure, it is characterized in that: the Guan Liang in described horizontal support structure (10) uses two models to be the channel-section steel of 28 ~ 40#, H profile steel or I-steel, the I-steel Two bors d's oeuveres that steel pipe support uses model to be 22 ~ 36# is constituted.